Pipe connecting device, fastening bolt of pipe connecting device and connecting and detaching method of pipe connecting device

Abstract

The invention discloses a pipe connecting device and a fastening bolt and pipe connecting and detaching method thereof. The pipe connecting device comprises a connecting body, a fastening bolt and a fastening nut, a bulging part is arranged on a connecting pipe of the connecting body, the bulging part is pressed into the external pipe, so that the external pipe is in a diameter expanding state, and the connecting pipe is connected with the external pipe; the fastening bolt is provided with a bolt body and a bolt clamping pipe, and the bolt body can penetrate through the bulging part to be arranged on the connecting pipe in a penetrating and sleeving mode; the bolt clamping pipe is formed by splicing or embedding, can be sleeved on the connecting pipe in a penetrating manner, but cannot pass through the bulging part, so that the fastening bolt can be sleeved on the connecting pipe in a penetrating manner, and is clamped, pushed and pressed into the bulging part of the external pipe; the fastening bolt and the fastening nut are arranged on the two sides of the bulging part respectively, and the bulging part and the outer pipe on the outer layer of the bulging part are clamped and fixed through threaded connection, so that the connecting pipe and the outer pipe are fixedly connected, and multiple sealing is formed. The device provided by the invention is simple in structure and convenient to operate, and has a good market application prospect.

Description

Technical Field

[0001] The present invention belongs to the technical field of resin pipe connection, and particularly relates to a pipe connection device, a fastening bolt, and a connection and disassembly method thereof applied to the manufacturing processes in technical fields such as semiconductor, liquid crystal display panel, photovoltaic, biotechnology, pharmaceutical, medical device, microelectronics, optics, disk, automotive industry, and aviation and aerospace fields. Background Art

[0002] In the manufacturing processes of technical fields such as semiconductor, liquid crystal display panel, photovoltaic, biotechnology, pharmaceutical, medical device, microelectronics, optics, disk, automotive industry, and aviation and aerospace fields, most of the fluids used are some corrosive chemical liquids, gases, or some fluids with ultra-high purity requirements. Such fluids are usually transported by resin ducts in machinery and equipment. The corrosion resistance of resin ducts can resist the erosion of chemical fluids, and their chemical inertness and the property of not easily reacting with chemicals can also meet the requirements of ultra-high purity and stability of the transported fluids.

[0003] In actual production, these resin ducts need to be connected by a pipe connection device between them and between the resin ducts and the equipment. Such pipe connection devices are usually made of resin materials of the same quality as the resin ducts. Therefore, the commonly used resin materials include tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer (PFA, also known as perfluoroalkylated substance, soluble polytetrafluoroethylene), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), tetrafluoroethylene-ethylene copolymer (ETFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polyvinyl chloride (PVC), polypropylene (PP), polyethylene (PE), polychlorotrifluoroethylene (PCTFE), polyetheretherketone (PEEK), bisphenol A polysulfone (PSU), polyphenylene sulfone (PPSU), and polyethersulfone (PESU, PES), etc.

[0004] If the connection performance of the pipe connection device used in production is not good enough or does not meet the standards, leakage is likely to occur at the connection, and even safety accidents may be caused. Therefore, a pipe connection device with excellent and stable connection and sealing effects is needed to ensure the safety of the resin duct connection. Summary of the Invention

[0005] The present invention provides a pipe connection device, a fastening bolt, and a connection and disassembly method thereof. The pipe connection device is used to connect an external pipe for transporting fluid and communicate with a fluid transportation pipeline. The pipe connection device clamps and presses the bulged part of the external pipe from both sides of the bulged part through the threaded connection of the fastening bolt and the fastening nut, so as to clamp and fix the bulged part and the outer layer of the external pipe, making the connection between the connecting pipe and the external pipe fixed and ensuring the stability of the connection. At the same time, multiple seals are formed at the connection between the connecting pipe and the external pipe, ensuring the high efficiency and stability of the seal.

[0006] To achieve the above object, a technical solution of the present invention is to provide a pipe connection device, which includes:

[0007] A connection body having at least two connecting pipes; a bulging portion is provided on each connecting pipe, and the bulging portion is used to be pressed into an external pipe to make the external pipe in a state of expanded diameter, so as to connect the connecting pipe with the external pipe;

[0008] A number of fastening bolts, which can be sleeved on the connecting pipe and are arranged on one side of the bulging portion; a first clamping portion is provided inside the fastening bolt for clamping and pushing the bulging portion pressed into the external pipe;

[0009] A number of fastening nuts, which can be sleeved on the external pipe and are arranged on the other side of the bulging portion; a second clamping portion is provided inside the fastening nut for clamping and pushing the bulging portion pressed into the external pipe;

[0010] The fastening nut is threadedly connected with the fastening bolt, and the two respectively clamp and push the bulging portion pressed into the external pipe from both sides of the bulging portion, so as to fix the connection between the connecting pipe and the external pipe and form a seal.

[0011] Optionally, the bulging portion is formed by the outer wall of the connecting pipe bulging outwards;

[0012] The bulging portion is located at the second end of the connecting pipe;

[0013] One end or one side of each component close to the connection body in the assembled state is the first end or the first side, and one end or one side far from the connection body is the second end or the second side.

[0014] Optionally, the bulging portion has a first pressure-bearing surface and a second pressure-bearing surface;

[0015] Among them, the first pressure-bearing surface is located on the first side of the bulging portion, and the second pressure-bearing surface is located on the second side of the bulging portion;

[0016] The first pressure-bearing surface and the second pressure-bearing surface are conical curved surfaces;

[0017] In the direction along the connecting pipe and pointing to its second end, the outer diameter of the first pressure-bearing surface gradually increases, and the outer diameter of the second pressure-bearing surface gradually decreases.

[0018] Optionally, the bulging portion further has a third pressure-bearing surface;

[0019] The third pressure-bearing surface is located between the first pressure-bearing surface and the second pressure-bearing surface;

[0020] The third pressure-bearing surface is a cylindrical curved surface;

[0021] In the direction along the connecting pipe, the outer diameter of the third pressure-bearing surface remains unchanged.

[0022] Optionally, the maximum outer diameter of the bulged portion is the outer diameter of the third pressure-bearing surface; or,

[0023] the maximum outer diameter of the bulged portion is the maximum outer diameter of the first pressure-bearing surface or the second pressure-bearing surface.

[0024] Optionally, a seal is formed between the bulged portion at its maximum outer diameter and the outer tube.

[0025] Optionally, each connecting tube further has a non-bulged portion;

[0026] the non-bulged portion is the part of the connecting tube other than the bulged portion.

[0027] Optionally, the non-bulged portion is located on the first side of the bulged portion, and the fastening bolt is sleeved on the non-bulged portion.

[0028] Optionally, the part of the non-bulged portion in contact with the bulged portion is also pressed into the outer tube.

[0029] Optionally, the first clamping portion and the second clamping portion are of an annular structure.

[0030] Optionally, the first composite outer diameter R1 ≤ the inner diameter of the first clamping portion < the second composite outer diameter R2; wherein,

[0031] the first composite outer diameter R1 is the outer diameter at the non-bulged portion pressed into the outer tube, and the second composite outer diameter R2 is the maximum outer diameter at the bulged portion pressed into the outer tube;

[0032] The first clamping portion clamps and presses the first pressure-bearing surface and the outer tube outside it, so as to form a seal between the first pressure-bearing surface and the outer tube.

[0033] Optionally, the inner wall of the first clamping portion is a cylindrical curved surface, and the first clamping portion clamps and presses the first pressure-bearing surface and the outer tube outside it through its inner edge; or,

[0034] the inner wall of the first clamping portion has a conical curved surface and can fit with the first pressure-bearing surface, and the first clamping portion clamps and presses the first pressure-bearing surface and the outer tube outside it through its inner wall of the conical curved surface.

[0035] Optionally, the outer diameter of the outer tube ≤ the inner diameter of the second clamping portion < the second composite outer diameter R2; wherein,

[0036] the second composite outer diameter R2 is the maximum outer diameter at the bulged portion pressed into the outer tube;

[0037] The second clamping portion clamps and presses the second pressure-bearing surface and the outer tube outside it, so as to form a seal between the second pressure-bearing surface and the outer tube.

[0038] Optionally, the inner wall of the second clamping portion is a cylindrical curved surface, and the second clamping portion clamps and presses the second pressure-bearing surface and the outer tube outside it through its inner edge; or,

[0039] The inner wall of the second clamping part has a conical curved surface and can be fitted with the second pressure-bearing surface. The second clamping part clamps and presses the second pressure-bearing surface and the outer tube outside it through the inner wall of its conical curved surface.

[0040] Optionally, the end face of the bulging part is a conical curved surface;

[0041] In the direction along the connecting pipe and pointing to its second end, the inner diameter of the port shows an increasing trend.

[0042] Optionally, the pipe diameters of the connecting pipes are the same or not completely the same;

[0043] The inner diameter of each connecting pipe is consistent with the inner diameter of the outer pipe it is connected to.

[0044] Optionally, the connecting body further has a cavity, and the cavity is communicated with each connecting pipe;

[0045] The connecting body is any one of two-way, three-way or multi-way pipe connection structures.

[0046] Optionally, a valve body is arranged in the cavity to control the communication or disconnection between the cavity and each connecting pipe.

[0047] Optionally, the outer wall of the fastening bolt is provided with a thread structure to cooperate with the fastening nut for threaded connection.

[0048] Optionally, the fastening nut has a nut body;

[0049] The inner wall of the nut body is provided with a thread structure for threaded connection with the fastening bolt.

[0050] Optionally, the second clamping part is arranged inside the nut body;

[0051] The second clamping part is located on the second side of the thread structure of the nut body.

[0052] Optionally, the fastening bolt and the fastening nut further have a third positioning structure for indicating the proper fastening position of the fastening bolt and the fastening nut;

[0053] At the proper fastening position, the fastening bolt and the fastening nut fix the connection between the connecting pipe and the outer pipe, and multiple seals are formed at the connection between the connecting pipe and the outer pipe.

[0054] Optionally, the third positioning structure includes a third positioning groove arranged on the inner wall of the fastening nut and a third positioning protrusion arranged on the outer wall of the fastening bolt;

[0055] When the fastening bolt and the fastening nut are screwed to the proper fastening position, the third positioning protrusion is inserted into the third positioning groove.

[0056] Optionally, the third positioning groove is an annular groove located on the first side of the threaded structure of the fastening nut;

[0057] The third positioning protrusion is a continuous or discontinuous annular protrusion located on the first side of the threaded structure of the fastening bolt;

[0058] The shape and size of the third positioning groove match those of the third positioning protrusion.

[0059] Optionally, the cross-sections of the annular bodies of the third positioning groove and the third positioning protrusion are both arc-shaped.

[0060] Optionally, the pipe connection device and the external pipe are made of synthetic resin materials.

[0061] Optionally, the number of the fastening bolts and the fastening nuts is determined according to the number of the connecting pipes or the bulging parts.

[0062] Another technical solution of the present invention is to provide a fastening bolt applicable to any of the above-mentioned pipe connection devices;

[0063] The fastening bolt can be sleeved on the connecting pipe and is arranged on one side of the bulging part; a first clamping part is arranged inside the fastening bolt for clamping and pushing the bulging part pressed into the external pipe.

[0064] Optionally, each fastening bolt includes a bolt body and a bolt pipe clamp;

[0065] A bolt through-hole is formed inside the bolt body, and the bolt pipe clamp is placed inside the bolt through-hole; the bolt body can pass through the second end of the connecting pipe, pass through the bulging part, and be sleeved on the non-bulging part; the bolt pipe clamp is a pipe structure formed by splicing or fitting, and it can be formed by surrounding the non-bulging part or the external pipe on its outer layer and splicing or fitting.

[0066] Optionally, the bolt pipe clamp is formed by splicing or fitting two or more pipe walls;

[0067] Each pipe wall of the bolt pipe clamp is an arc-shaped pipe wall and has the same length;

[0068] The arc sizes of each pipe wall are the same or not completely the same.

[0069] Optionally, the bolt pipe clamp is formed by splicing a pipe structure with a pipe seam;

[0070] The pipe seam is arranged along the direction of the bolt pipe clamp.

[0071] Optionally, the bolt through-hole is arranged along the direction of the fastening bolt and penetrates through the bolt body;

[0072] The diameter of the bolt through-hole > the maximum outer diameter of the bulging part.

[0073] Optionally, the bolt body has a bolt rod and a bolt head;

[0074] The bolt head is located at the first end of the bolt rod;

[0075] The thread structure of the fastening bolt is provided on the bolt rod.

[0076] Optionally, the bolt body further has a limiting portion;

[0077] The limiting portion is located inside the bolt through-hole and is used to carry the bolt clamping tube.

[0078] Optionally, the limiting portion at least has a limiting body and a central hole; wherein,

[0079] The limiting body is arranged on the inner wall of the bolt body along the circumferential direction; the central hole is located at the central position of the limiting body, and the aperture of the central hole < the aperture of the bolt through-hole.

[0080] Optionally, at least the outer diameter of the bolt clamping tube > the aperture of the central hole, so that the limiting body can carry the bolt clamping tube;

[0081] The aperture of the central hole > the maximum outer diameter of the bulging portion, so that the bolt body can pass through the bulging portion. Optionally, the limiting portion is a ring structure;

[0082] Its limiting body is a ring body with a ring structure, and the central hole is a ring hole with a ring structure;

[0083] The inner diameter of the bolt clamping tube ≥ the aperture of the central hole.

[0084] Optionally, the entire end face of the first end of the bolt clamping tube is located on the limiting body.

[0085] Optionally, the limiting portion further has a plurality of through-holes, and the through-holes are opened on the limiting body; at least one through-hole corresponds to the bolt clamping tube or each clamping tube wall thereof, and a part of the end face is located at the corresponding through-hole.

[0086] Optionally, by setting marks at visible positions on the bolt body to specify the adjacent positions of each adjacent tube wall, at least one through-hole is opened in the area of the limiting body between any two adjacent marks, and at least one through-hole corresponds to the clamping tube wall located in the area of the limiting body.

[0087] Optionally, at least N through-holes on the limiting body are evenly distributed in the circumferential direction, so that the end face of the first end of any clamping tube wall is located at at least one through-hole, and at least one through-hole corresponds to each clamping tube wall; wherein, N is a positive integer, N×min(L1)≥ the circumference of the bolt clamping tube > (N - 1)×min(L1), and min(L1) is the arc length of the clamping tube wall with the smallest arc length among all the clamping tube walls that are joined to form the bolt clamping tube.

[0088] Optionally, the limiting portion is a circular ring structure;

[0089] Its limiting body is a ring body with a circular ring structure, and the central hole is a ring hole with a circular ring structure;

[0090] The aperture of the central hole > the inner diameter of the bolt clamping tube.

[0091] Optionally, the outer end face of the first end of the bolt clamping tube is on the limiting body, and the inner end face is in the central hole.

[0092] Optionally, the limiting portion is formed by a plurality of convex teeth distributed circumferentially on the inner wall of the bolt body; its limiting body is a plurality of convex teeth; the central hole is a hole surrounded by a plurality of convex teeth distributed circumferentially; the limiting portion also has a gap, and the gap is the space formed between adjacent convex teeth;

[0093] The inner diameter of the bolt clamping tube ≥ the aperture of the central hole.

[0094] Optionally, both the outer end face and the inner end face of the first end of the bolt clamping tube are on the limiting body. Optionally, when the bolt clamping tube is formed by splicing a tube structure with a tube seam, part of its end face is in the gap.

[0095] Optionally, when the bolt clamping tube is formed by splicing or fitting two or more clamping tube walls, the arc length of any gap < the arc length of any clamping tube wall among all the clamping tube walls forming the bolt clamping tube, so that each clamping tube wall will have at least one convex tooth to support it.

[0096] Optionally, the arc length of any convex tooth < the arc length of any clamping tube wall among all the clamping tube walls forming the bolt clamping tube, so that for each clamping tube wall, part of its end face at the first end is in the gap.

[0097] Optionally, the limiting portion is formed by a plurality of convex teeth distributed circumferentially on the inner wall of the bolt body; its limiting body is a plurality of convex teeth; the central hole is a hole surrounded by a plurality of convex teeth distributed circumferentially; the limiting portion also has a gap, and the gap is the space formed between adjacent convex teeth;

[0098] The aperture of the central hole > the inner diameter of the bolt clamping tube.

[0099] Optionally, the outer end face of the first end of the bolt clamping tube is on the limiting body, and the inner end face is in the central hole.

[0100] Optionally, when the bolt clamping tube is formed by splicing a tube structure with a tube seam, part of its outer end face at the first end is also in the gap.

[0101] Optionally, when the bolt clamping tube is formed by splicing or fitting two or more clamping tube walls, the arc length of any gap < the arc length of any clamping tube wall among all the clamping tube walls forming the bolt clamping tube, so that each clamping tube wall will have at least one convex tooth to carry it.

[0102] Optionally, the arc length of the convex tooth ≥ the arc length of the clamping tube wall; or,

[0103] If the arc length of the convex tooth < the arc length of the clamping tube wall, then the clamping tube wall, the outer end face of its first end and part of the end face are at the gap.

[0104] Optionally, the tube length of the bolt clamping tube ≤ the maximum tube length of the non-bulging part between the bolt body sleeved on the non-bulging part and the bulging part; and,

[0105] The tube length of the bolt clamping tube is equal to the distance from the limiting part to the second end of the bolt body.

[0106] Optionally, each fastening bolt may include two or even more bolt clamping tubes;

[0107] The tube length of each bolt clamping tube ≤ the maximum tube length of the non-bulging part between the bolt body sleeved on the non-bulging part and the bulging part; and,

[0108] The sum of the tube lengths of each bolt clamping tube is equal to the distance from the limiting part to the second end of the bolt body.

[0109] Optionally, the limiting part moves or extends towards the second end of the bolt body, shortening the distance from the limiting part to the second end of the bolt body.

[0110] Optionally, the first composite outer diameter R1 ≤ the inner diameter of the first clamping part < the second composite outer diameter R2; where the first composite outer diameter R1 is the outer diameter at the non-bulging part of the externally pressed tube, and the second composite outer diameter R2 is the maximum outer diameter at the bulging part of the externally pressed tube;

[0111] The first clamping part clamps and presses the first pressure-bearing surface and the outer tube thereof, so as to form a seal between the first pressure-bearing surface and the outer tube.

[0112] Optionally, the inner wall of the first clamping part is a cylindrical curved surface, and the first clamping part clamps and presses the first pressure-bearing surface and the outer tube thereof through its inner edge; or,

[0113] The inner wall of the first clamping part has a conical curved surface and can fit with the first pressure-bearing surface, and the first clamping part clamps and presses the first pressure-bearing surface and the outer tube thereof through its conical curved surface inner wall.

[0114] Optionally, the outer diameter of the bolt clamping tube ≤ the aperture of the bolt through-hole;

[0115] The inner diameter of the bolt clamping tube ≥ the first composite outer diameter R1, where the first composite outer diameter R1 is the outer diameter at the non-bulging part of the externally pressed tube.

[0116] Optionally, when the inner diameter of the bolt clamping tube < the second composite outer diameter R2, the first clamping portion can be the second end of the bolt clamping tube; wherein, the second composite outer diameter R2 is the maximum outer diameter at the bulged portion pressed into the outer tube.

[0117] Optionally, the first clamping portion is an annular structure arranged inside the bolt clamping tube; the inner diameter of the annular structure < the second composite outer diameter R2, and the annular structure is arranged along the circumferential direction on the inner wall at the second end of the bolt clamping tube; wherein, the second composite outer diameter R2 is the maximum outer diameter at the bulged portion pressed into the outer tube. Optionally, when the outer diameter of the bolt clamping tube = the aperture of the bolt through-hole, the bolt body tightens the bolt clamping tube formed by the butt joint of its inner walls to keep the bolt clamping tube in a tubular structure state;

[0118] When the outer diameter of the bolt clamping tube < the aperture of the bolt through-hole, a tightening structure is provided on the outer wall of the bolt clamping tube, and the outer diameter of the tightening structure = the aperture of the bolt through-hole. The bolt body tightens the tightening structure through its inner wall to keep the bolt clamping tube in a tubular structure state.

[0119] Optionally, the tightening structure is a complete annular structure; or,

[0120] The tightening structure is an incomplete annular structure and is composed of several discontinuous annular segments. Optionally, the tightening structure is arranged at the second end of the bolt clamping tube.

[0121] Optionally, the bolt clamping tube has a first positioning structure for positioning two adjacent clamping tube walls to align the two ends of the two adjacent clamping tube walls;

[0122] The first positioning structure includes a positioning pin arranged on the side surface of one adjacent clamping tube wall and a positioning groove arranged on the side surface of the other adjacent clamping tube wall.

[0123] Optionally, at the adjacent position of the bolt clamping tube, the setting position, quantity and shape of the positioning pin on the side surface of one adjacent clamping tube wall match the setting position, quantity and shape of the positioning groove on the side surface of the other adjacent clamping tube wall.

[0124] Optionally, the fastening bolt further has a second positioning structure;

[0125] The second positioning structure cooperates with the limiting portion to clamp the bolt clamping tube in the direction of the connecting tube, so that the bolt clamping tube and the bolt body move synchronously; meanwhile, the bolt body can also tighten the bolt clamping tube through the second positioning structure.

[0126] Optionally, the second positioning structure includes a second positioning groove arranged at the inner wall of the second end of the bolt body and a second positioning protrusion arranged on the outer wall of the second end of the bolt clamping tube;

[0127] When the first end of the bolt body reaches the limiting portion, the second positioning protrusion is located in the second positioning groove. Optionally, the second positioning groove is an annular groove;

[0128] The second positioning protrusion is a continuous or discontinuous annular protrusion;

[0129] The shape and size of the second positioning groove match those of the second positioning protrusion, and the maximum outer diameter of the second positioning protrusion is equal to the maximum inner diameter of the second positioning groove.

[0130] Optionally, the annular cross-sections of both the second positioning groove and the second positioning protrusion are arc-shaped.

[0131] Optionally, the wall of each clamping tube is provided with a concavo-convex structure;

[0132] At each adjacent joint of the bolt clamping tube, the concavo-convex structures of the adjacent tube walls are mutually engaged to form a complete tube wall at the engagement position; meanwhile, the concavo-convex structures of the adjacent tube walls also bite or interlock with each other, so as to form a connection between the adjacent tube walls and keep the bolt clamping tube in a tube structure state.

[0133] Optionally, at each adjacent joint of the bolt clamping tube, the concavo-convex structure of one adjacent tube wall is a groove opened on the side surface, the groove extends along the direction where the bolt clamping tube is located, and its extension length is equal to the tube length of the bolt clamping tube; the concavo-convex structure of the other adjacent tube wall is a convex block arranged on the side surface, the convex block extends along the direction where the bolt clamping tube is located, and its extension length is equal to the tube length of the bolt clamping tube; or,

[0134] The concavo-convex structure of the other adjacent tube wall is a plurality of convex blocks arranged on the side surface, the plurality of convex blocks are distributed along the direction where the bolt clamping tube is located, and there is a convex block arranged at the second end of the bolt clamping tube, each convex block extends along the direction where the bolt clamping tube is located, and its extension length is less than the tube length of the bolt clamping tube.

[0135] Optionally, at each adjacent joint of the bolt clamping tube, the concavo-convex structure of one adjacent tube wall is a plurality of grooves opened on the side surface, the plurality of grooves are distributed along the direction where the bolt clamping tube is located, each groove extends along the direction of the tube diameter and penetrates the tube wall;

[0136] The concavo-convex structure of the other adjacent tube wall is a plurality of convex blocks arranged on the side surface, the plurality of convex blocks are distributed along the direction where the bolt clamping tube is located, each convex block extends along the direction of the tube diameter, and its extension length is equal to the wall thickness of the tube wall.

[0137] Optionally, at each adjacent joint of the bolt clamping tube, the convex block on one adjacent tube wall is embedded in the groove of the other adjacent tube wall;

[0138] The shape and size of the convex block match those of the groove into which it is embedded, and a complete tube wall is formed at the engagement position.

[0139] Optionally, at each adjacent joint of the bolt clamp pipe, the bumps on one adjacent clamp pipe wall side, their quantity and setting positions correspond to the grooves on the other adjacent clamp pipe wall side.

[0140] Optionally, the bumps are formed by protruding from their side surfaces along the circumferential direction of the pipe wall towards the outside of the pipe wall, and have a head and a tail; the part of the bump connected to the side surface is the tail, and the rest is the head, and at least part of the head of the bump is larger than its tail;

[0141] The grooves are formed by denting from their side surfaces along the circumferential direction of the pipe wall towards the inside of the pipe wall, and have a notch and a bottom; the part of the groove close to the side surface is the notch, and the rest is the bottom, and at least part of the bottom of the groove is larger than the notch;

[0142] When the bump is embedded in the groove, its head is located at the bottom of the groove and its tail is located at the notch, and the groove catches the head of the bump through the notch, so that the bump and the groove are engaged with each other, and the adjacent clamp pipe walls form a connection at the adjacent joint.

[0143] Optionally, the groove further has a port, and the bump is embedded in the groove from the port of the groove. Optionally, the shapes of the bump and the groove engaged with it can be any one of a convex shape, an arc shape, a trapezoid shape, a pentagon shape, a hexagon shape, a deformed trapezoid shape, a racket shape, a cat's paw shape, a Christmas tree shape. Optionally, grooves are opened on both side surfaces of the clamp pipe wall as the concave-convex structure; or, bumps are provided on both side surfaces of the clamp pipe wall as the concave-convex structure; or,

[0144] A groove is opened on one side surface of the clamp pipe wall as the concave-convex structure, and a bump is provided on the other side surface as the concave-convex structure.

[0145] Optionally, at each adjacent joint of the bolt clamp pipe, the concave-convex structure of one adjacent clamp pipe wall is a groove opened on the inner wall. Taking this groove as the first groove, the first groove extends along the direction of the bolt clamp pipe, and the extension length is equal to the pipe length of the bolt clamp pipe;

[0146] The concave-convex structure of the other adjacent clamp pipe wall is a groove opened on the outer wall. Taking this groove as the second groove, the second groove extends along the direction of the bolt clamp pipe, and the extension length is equal to the pipe length of the bolt clamp pipe. Optionally, at each adjacent joint of the bolt clamp pipe, the outer wall of one adjacent clamp pipe wall is embedded in the groove of the other adjacent clamp pipe wall; wherein,

[0147] The outer wall of the first groove, its shape and size match the second groove it is embedded in, and a complete pipe wall is formed at the fitting position;

[0148] The outer wall of the second groove, its shape and size match the first groove it is embedded in, and a complete pipe wall is formed at the fitting position.

[0149] Optionally, the first groove is formed by recessing from the inner wall of the clip pipe wall outward along the pipe diameter direction, having a notch and a bottom; the first groove has the part close to the inner wall as the notch and the rest as the bottom;

[0150] The second groove is formed by recessing from the outer wall of the clip pipe wall inward along the pipe diameter direction, having a notch and a bottom; the second groove has the part close to the outer wall as the notch and the rest as the bottom.

[0151] Optionally, the first groove or the second groove further has a port;

[0152] The outer side wall of the first groove is embedded into the second groove from the port of the second groove;

[0153] The outer side wall of the second groove is embedded into the first groove from the port of the first groove.

[0154] Optionally, the shape of each outer side wall and the groove it fits into can be any one of a rectangle, a convex shape, an arc shape, a trapezoid, a pentagon, a hexagon, a deformation of a trapezoid, a racket shape, a cat's paw shape, a Christmas tree shape.

[0155] Optionally, when the shape of each outer side wall and the groove it fits into is a rectangle, each outer side wall can also be embedded into the groove from the notch.

[0156] Optionally, the first groove is provided on the inner walls on both sides of the clip pipe wall as the concave-convex structure; or, the second groove is provided on the outer walls on both sides of the clip pipe wall as the concave-convex structure; or,

[0157] The first groove is provided on the inner wall on one side of the clip pipe wall as the concave-convex structure, and the second groove is provided on the outer wall on the other side of the clip pipe wall as the concave-convex structure.

[0158] Optionally, each clip pipe wall of the bolt clip pipe itself is a mountain-shaped pipe wall structure, and uses its mountain-shaped pipe wall structure as the concave-convex structure, and the adjacent clip pipe walls in the bolt clip pipe are arranged in opposite directions.

[0159] Optionally, each clip pipe wall has a base wall, a main wall, side walls, and grooves;

[0160] On one side of the base wall, a main wall is provided at the middle position, and side walls are respectively provided at both ends. Grooves are respectively formed between the main wall and the side walls on both sides of it. The sum of the lengths of the base wall and the main wall is the pipe length of the bolt clip pipe.

[0161] Optionally, at each adjacent part of the bolt clip pipe, the side wall of one adjacent clip pipe wall is embedded into the groove of the other adjacent clip pipe wall;

[0162] The shape and size of each side wall match the groove it is embedded into, and a complete pipe wall is formed at the fitting position.

[0163] Optionally, at each end of the bolt clamp tube, the base wall of an adjacent clamp tube wall is spliced ​​with the main wall of another adjacent clamp tube wall to form a complete tube wall at the splicing location;

[0164] At the same time, the sum of the arc lengths of the base walls and the main walls at the end is equal to the circumference of the bolt clamping tube.

[0165] Another technical solution of the present invention is to provide a pipe connection method, which is applicable to any of the above-mentioned pipe connection devices, and comprises the following steps:

[0166] The bolt body passes from the second end of the connecting pipe, through the bulging portion, and is sleeved on the non-bulging portion;

[0167] The fastening nut is sleeved on the external tube;

[0168] The bulging portion and the non-bulging portion connected thereto are pressed into the external tube, the external tube is in an expanded state, a connection is formed between the connecting tube and the external tube, and the fastening nut is located on the second side of the bulging portion;

[0169] The bolt clamp tube is installed in the bolt body to form a fastening bolt; the fastening bolt is sleeved on the non-bulging part and is located on the first side of the bulging part;

[0170] The fastening bolts and fastening nuts on both sides of the bulging part are screwed tight, and the fastening bolts and fastening nuts apply a pushing force in opposite directions to the bulging part pressed into the external pipe, thereby fixing the connection between the connecting pipe and the external pipe and forming multiple seals at the connection.

[0171] Optionally, at the non-bulging portion between the bolt body and the bulging portion, each clamping tube wall surrounds the non-bulging portion or an outer tube of its outer layer to form a bolt clamping tube, and the bolt clamping tube is installed into the bolt through hole along the non-bulging portion to form a fastening bolt; or,

[0172] At the non-bulging portion between the bolt body and the bulging portion, each clamping tube wall is respectively installed into the bolt body along the non-bulging portion, and is assembled in the bolt through hole to form a bolt clamping tube and a fastening bolt.

[0173] Optionally, at the non-bulging portion between the bolt body and the bulging portion, the tube seam of the bolt clamping tube is stretched open, the bolt clamping tube is wrapped around the non-bulging portion or the outer tube of its outer layer, and the bolt clamping tube is installed into the bolt through hole along the non-bulging portion to form a tightening bolt.

[0174] Optionally, tighten the fastening bolts and fastening nuts to a moderately tight position.

[0175] Another technical solution of the present invention is to provide a pipe disassembly method, which is applicable to any of the above-mentioned pipe connection devices and comprises the following steps:

[0176] The fastening bolt and the fastening nut are unscrewed spirally;

[0177] The connecting pipe is withdrawn from the external pipe and disassembled from the external pipe;

[0178] The fastening bolt separates from the non-bulging part along the bulging part, and the bolt clamping pipe or its clamping pipe wall is taken out from the bolt through hole;

[0179] The bolt body is removed from the second end of the connecting pipe through the bulging part;

[0180] The fastening nut is removed from the external pipe.

[0181] Optionally, the bolt clamping pipe is pushed out of the bolt body, the adjacent clamping pipe walls are disassembled, and the bolt clamping pipe is removed from the non-bulging part; or,

[0182] The clamping pipe wall is pushed out of the bolt body and removed from the non-bulging part.

[0183] Optionally, the bolt clamping pipe is pushed out of the bolt body, the pipe seam of the bolt clamping pipe is expanded, and the bolt clamping pipe is removed from the non-bulging part.

[0184] Compared with the prior art, a pipe connection device, its fastening bolt, and a pipe connection and disassembly method provided by the present invention have the beneficial effects that:

[0185] (1) The present invention provides a bulging part on the connecting pipe of the connecting body. By pressing the bulging part into the external pipe to make the external pipe in an expanded diameter state, a connection is formed with the connecting pipe. In this way, the external pipe is directly connected to the connecting body, and only one connection is formed between each external pipe and the connecting body; the present invention does not require additional components to connect the pipelines between the connecting body and the external pipe to form at least two connections (such as the connection between the connecting body and other components, and the connection between other components and the external pipe); a series of multiple connections naturally requires higher sealing and connection technologies, and it is more likely to experience wear, aging, improper operation, etc. under long-term, high-temperature fluid or environment, and high-frequency disassembly and repair, resulting in a significant decline in sealing and connection performance; the present invention minimizes the connections between each external pipe and the connecting body, which can fundamentally improve the stability of pipeline sealing and connection and reduce the difficulty of pipeline connection and sealing.

[0186] (2) The present invention disassembles the fastening bolt into two parts: a bolt body and a bolt clamping pipe, and the bolt clamping pipe is formed by splicing or fitting. This enables the fastening bolt to be both arranged on the first side of the bulging part pressed into the external pipe and to cooperate with the fastening nut to clamp and push the bulging part pressed into the external pipe, solving the problem that a common fastening bolt cannot achieve both being placed on the first side of the bulging part and clamping and pushing the bulging part pressed into the external pipe at the same time.

[0187] (3) The pipe connection device provided by the present invention can form seals with external pipes at the first pressure-bearing surface, the second pressure-bearing surface, and the third pressure-bearing surface of the bulging part respectively. That is to say, the present invention can form triple seals at each connection. Compared with other existing pipe connection devices, the present invention can provide efficient and stable sealing performance for pipeline connection.

[0188] (4) For the pipe connection device provided by the present invention, each component has a simple structure, is easy to produce and process, has a low production cost, is convenient to use, and has excellent pipeline connection and sealing effects. The device provided by the present invention has good market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0189] Figure 1 It is a half-sectional and exploded schematic diagram of the pipe connection device in the first embodiment of the present invention;

[0190] Figure 2 It is a half-sectional, assembled schematic diagram of the pipe connection device in the first embodiment of the present invention and its partial enlarged view;

[0191] Figure 3 It is a connection schematic diagram of the connection body and the external pipe in the first embodiment of the present invention and its partial enlarged view;

[0192] Figure 4 It is a schematic diagram of the interaction between the bulging part and the non-bulging part and the external pipe in the first embodiment of the present invention;

[0193] Figure 5 It is a schematic diagram of the structure of the fastening bolt in the first embodiment of the present invention;

[0194] Figure 6 It is a half-sectional schematic diagram of the bolt body in the first embodiment of the present invention;

[0195] Figure 7 It is a half-sectional schematic diagram of the fastening bolt and a partial enlarged view of the bolt clamping pipe end face in the first embodiment of the present invention;

[0196] Figure 8 It is a schematic diagram of the state where the pipe wall is assembled to form a bolt clamping pipe in the first embodiment of the present invention;

[0197] Figure 9 It is a half-sectional schematic diagram of the fastening nut in the first embodiment of the present invention;

[0198] Figure 10 It is a half-sectional schematic diagram of the two-way connection body in the second embodiment of the present invention;

[0199] Figure 11 It is a half-sectional schematic diagram of the four-way connection body in the second embodiment of the present invention;

[0200] Figure 12 It is a half-sectional schematic diagram of the connection body in the third embodiment of the present invention;

[0201] Figure 13 Schematic half-section view of the fastening bolt in the fourth embodiment of the present invention and a partially enlarged view of the end face of the clamp pipe wall

[0202] Figure 14 Assembly sectional view of the bolt clamp pipe in the bolt body in the fifth embodiment of the present invention, top view of its limiting part, and top view of the limiting part bearing the bolt clamp pipe

[0203] Figure 15 Schematic diagram of the positional relationship between the clamp pipe wall and the limiting part in the fifth embodiment of the present invention

[0204] Figure 16 Assembly diagram of the bolt clamp pipe in the bolt body in the sixth embodiment of the present invention, top view of its limiting part, and top view of the limiting part bearing the bolt body

[0205] Figure 17 Assembly diagram of the clamp pipe wall in the bolt body in the sixth embodiment of the present invention

[0206] Figure 18 Schematic diagram of the positional relationship between the clamp pipe wall and the limiting part in the sixth embodiment of the present invention

[0207] Figure 19 Inverted assembly diagram of the bolt clamp pipe in the bolt body in the seventh embodiment of the present invention, bottom view of its limiting part, and bottom view of the limiting part bearing the bolt body

[0208] Figure 20 Schematic diagram of the assembly positional relationship between the bolt clamp pipe and the bolt body in the eighth embodiment of the present invention

[0209] Figure 21 Schematic diagram of the assembly positional relationship between the bolt clamp pipe and the bolt body in the ninth embodiment of the present invention

[0210] Figure 22 Schematic diagram of the structure of the bolt clamp pipe with a pipe slit in the tenth embodiment of the present invention

[0211] Figure 23 Schematic diagram of the state where two clamp pipe walls with the same arc size are joined to form a bolt clamp in the eleventh embodiment of the present invention

[0212] Figure 24 Schematic diagram of the state where three clamp pipe walls are joined to form a bolt clamp in the twelfth embodiment of the present invention

[0213] Figure 25 Schematic comparison diagram of the joined state of the clamp pipe walls in the thirteenth embodiment of the present invention

[0214] Figure 26 Schematic comparison diagram of the states of the bolt clamp pipe clamping and pushing the bulging part in the fourteenth embodiment of the present invention

[0215] Figure 27 Schematic diagram for comparing the states of clamping and pushing the bulged part by the fastening nut in the fourteenth embodiment of the present invention;

[0216] Figure 28 Schematic diagram of the states of clamping and pushing the bulged part by the bolt pipe clamp in the fifteenth embodiment of the present invention;

[0217] Figure 29 Schematic diagram of the distribution of each tightening structure in the sixteenth embodiment of the present invention;

[0218] Figure 30 Assembly schematic diagram of the bolt pipe clamp and the bolt body in the sixteenth embodiment of the present invention;

[0219] Figure 31 Half-sectional schematic diagram of the bolt body and the bolt pipe clamp and their assembly schematic diagram in the seventeenth embodiment of the present invention;

[0220] Figure 32 Schematic diagram of the state where the pipe clamp walls are fitted to form a bolt pipe clamp in the eighteenth embodiment of the present invention;

[0221] Figure 33 End schematic diagram of the bolt pipe clamp formed by fitting in the eighteenth embodiment of the present invention;

[0222] Figure 34 Structural schematic diagram of the pipe clamp wall in the eighteenth embodiment of the present invention;

[0223] Figure 35 Schematic diagram of the state where the pipe clamp walls are fitted to form a bolt pipe clamp in the nineteenth embodiment of the present invention;

[0224] Figure 36 Outer wall schematic diagram of the bolt pipe clamp formed by fitting in the nineteenth embodiment of the present invention;

[0225] Figure 37 Outer wall schematic diagram of the bolt pipe clamp formed by fitting in the twentieth embodiment of the present invention;

[0226] Figure 38 Structural schematic diagram of the pipe clamp wall in the twentieth embodiment of the present invention;

[0227] Figure 39 End schematic diagram of the bolt pipe clamp formed by fitting in the twentieth embodiment of the present invention;

[0228] Figure 40 Schematic diagram of the state where the pipe clamp walls are fitted to form a bolt pipe clamp in the twenty-first embodiment of the present invention;

[0229] Figure 41 Assembly schematic diagram of the bolt body and the fastening nut in the twenty-second embodiment of the present invention. Detailed implementation manners

[0230] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part rather than all of the embodiments of the present invention; the features of each embodiment can be combined with or replaced by each other, unless explicitly excluded or should be excluded according to the context. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0231] Embodiment 1

[0232] As Figure 1 、 2 shown, this embodiment provides a pipe connection device 100, which includes a connection body 110, fastening bolts, and a fastening nut 140; among them, the fastening bolts further include a bolt body 120 and a bolt pipe clamp 130. In the pipe connection device 100, the connection body 110 is connected to an external pipe 150 to form a bulged connection part, and the external pipe is communicated with an external pipe (or an external pipe and a device) through the connection body 110 to form a fluid passage; the fastening bolts and the fastening nut 140 are respectively arranged on both sides of the connection part, and the fastening bolts and the fastening nut 140 are threadedly connected to clamp and push the connection part, so as to fix the connection between the connecting pipe and the external pipe and form a seal. The external pipe 150 is a pipeline made of resin material for transporting fluid. The connection body 110 will be introduced in detail below.

[0233] In this embodiment, the connection body 110 is a tee-shaped pipe connection structure, which can realize functions such as connection, turning, flow splitting or flow merging between three fluid pipelines (or three external pipes 150); the connection body 110 has a cavity 111 and three connecting pipes, as Figure 3 shown; the cavity 111 is communicated with each connecting pipe, and each connecting pipe can be respectively connected to different external pipes, so that a passage is formed through the connection of different external pipes by the connection body; the inner diameter of each connecting pipe can be the same as the inner diameter of the external pipe 150 connected thereto. All kinds of pipe diameters mentioned in this article, including inner diameter and outer diameter, are radii.

[0234] In this embodiment, the connection body 110 is a T-shaped pipe connection structure and the diameters of all connecting pipes are the same; it should be noted that the connection body 110 can also be a Y-shaped or other tee-shaped pipe connection structures, and the diameters of all connecting pipes can be the same or not completely the same. This embodiment does not limit the shape of the tee-shaped pipe connection structure, the diameter size of the connecting pipes, etc., nor does it limit that in other related examples, it can be designed according to the actual application situation.

[0235] Each connecting pipe includes a bulging portion 112 and a non-bulging portion 113; wherein, the bulging portion 112 is formed by the outer wall of the connecting pipe bulging outwards, and the bulging portion 112 is located at the second end of the connecting pipe; the non-bulging portion 113 is the part of the connecting pipe other than the bulging portion, and the non-bulging portion 113 is located on the first side of the bulging portion 112, as Figure 3 shown. In this article, one end or side of each component or part that is close to the connecting body (or the cavity) in the assembled state is the first end or the first side, and one end or side that is far from the connecting body (or the cavity) is the second end or the second side.

[0236] As mentioned above, the inner diameter of each connecting pipe is the same as the inner diameter of the external pipe 150 it is connected to, that is, the inner diameter of the connecting pipe = the inner diameter of the external pipe 150, then the outer diameter of the connecting pipe (including the outer diameter of the bulging portion 112 and the outer diameter of the non-bulging portion 113) > the inner diameter of the external pipe 150.

[0237] In the present invention, the outer diameter of the bulging portion 112 > the inner diameter of the external pipe 150. Therefore, when the bulging portion 112 of the connecting pipe is pressed into the external pipe 150, the bulging portion 112 will expand the external pipe 150 and make the external pipe 150 in a state of expanded diameter. The outer wall of the bulging portion 112 is in close contact with the inner wall of the external pipe 150. The bulging portion 112 will exert an expansion pressure on the external pipe 150, and the external pipe 150 will exert a tightening pressure on the bulging portion 112, as Figure 4 shown. A certain frictional force is formed between the inner wall of the external pipe 150 and the outer wall of the bulging portion 112 (or the connecting pipe), so that the external pipe 150 is connected to the connecting pipe and does not easily become loose.

[0238] Similarly, the outer diameter of the non-bulging portion 113 > the inner diameter of the external pipe 150. Therefore, when the non-bulging portion of the connecting pipe is pressed into the external pipe, the non-bulging portion pressed into the external pipe will expand the external pipe 150 and make the external pipe 150 in a state of expanded diameter. The outer wall of the non-bulging portion pressed into the external pipe is in close contact with the inner wall of the external pipe 150. The non-bulging portion will exert an expansion pressure on the external pipe 150, and the external pipe 150 will exert a tightening pressure on the non-bulging portion, as Figure 4 shown. A certain frictional force is also formed between the inner wall of the external pipe 150 and the outer wall of the non-bulging portion (or the connecting pipe).

[0239] The bulging portion 112 is located at the second end of the connecting pipe (or the non-bulging portion 113). Therefore, when the connecting pipe is connected to the external pipe 150, only the bulging portion 112 can be pressed into the external pipe 150, or both the bulging portion 112 and the non-bulging portion part connected to it can be pressed into the external pipe 150. This article does not make a limitation on this, nor does it limit that in other related examples, it can be designed according to the actual application situation. The bulging portion pressed into the external pipe makes the connecting pipe (or the connecting body 110) connected to the external pipe and forms a bulging connection part.

[0240] In this embodiment, the bulging portion 112 and the non-bulging portion connected thereto are both pressed into the outer tube 150, as Figure 4 shown. Therefore, between the connecting tube and the outer tube, in addition to the frictional force formed between the outer wall of the bulging portion and the inner wall of the outer tube, there is also a frictional force formed between the non-bulging portion pressed into the outer tube, its outer wall and the inner wall of the outer tube; compared with only pressing the bulging portion 112 into the outer tube, the connection between the connecting tube and the outer tube in this embodiment is enhanced, and to a certain extent, the phenomenon that the connecting tube easily slips out of the outer tube can be avoided, and it has a better connection effect in actual use.

[0241] In this embodiment, the outer wall of the bulging portion 112 can be divided into a first pressure-bearing surface 112a, a second pressure-bearing surface 112b, and a third pressure-bearing surface 112c, as Figure 3 shown; among them, the first pressure-bearing surface 112a is located on the first side of the bulging portion, and under the pushing force of the fastening bolt, it can form a seal I with the outer tube, as Figure 2 shown; the second pressure-bearing surface 112b is located on the second side of the bulging portion, and under the pushing force of the fastening nut, it can form a seal II with the outer tube; the third pressure-bearing surface 112c is located between the first pressure-bearing surface 112a and the second pressure-bearing surface 112b, connecting the first pressure-bearing surface 112a and the second pressure-bearing surface 112b, and it can form a seal III with the outer tube.

[0242] Both the first pressure-bearing surface 112a and the second pressure-bearing surface 112b are conical curved surfaces, and their outer diameters are gradually changing. Specifically, in the direction along the connecting tube and pointing to its second end, the outer diameter of the first pressure-bearing surface 112a starts from the outer diameter r of the non-bulging portion, gradually increases until the maximum outer diameter R of the bulging portion, and the outer diameter of the second pressure-bearing surface 112b starts from the maximum outer diameter R of the bulging portion, gradually decreases, but is greater than the inner diameter of the connecting tube; among them, the maximum outer diameter R of the bulging portion > the outer diameter r of the non-bulging portion, as Figure 3 shown.

[0243] The third pressure-bearing surface 112c is a cylindrical curved surface, and the outer diameter of the third pressure-bearing surface 112c remains unchanged in the direction along the connecting pipe; the outer diameter of the third pressure-bearing surface 112c is the maximum outer diameter R of the bulging part; when the bulging part 112 is pressed into the outer pipe 150, at the maximum outer diameter of the bulging part 112, that is, at the third pressure-bearing surface 112c, the expansion pressure on the outer pipe 150 is the largest, and the tightening pressure of the outer pipe it receives is also the largest. The fit between the outer pipe 150 and the third pressure-bearing surface 112c is the tightest. Therefore, a seal III can be formed between the third pressure-bearing surface 112c and the outer pipe. In the bulging part 112 of this embodiment, seals can be formed with the outer pipe 150 at the first pressure-bearing surface 112a, the second pressure-bearing surface 112b, and the third pressure-bearing surface 112c respectively. Or rather, triple seals can be formed at the connection of each connecting pipe and its outer pipe 150. Therefore, the pipe connection device in the present invention can provide strong and stable sealing performance. The relevant content of the seals at the first pressure-bearing surface 112a and the second pressure-bearing surface 112b will be described in detail in the subsequent text.

[0244] In the present invention, the value of the maximum outer diameter R of the bulging part can be designed according to the inner diameter of the outer pipe it needs to connect. It is required that while the bulging part can be pressed into the outer pipe, the bulging part has a certain expansion pressure on the outer pipe, so that a connection is formed between the connecting pipe and the outer pipe and a seal can be formed between the third pressure-bearing surface and the outer pipe. In addition, the degree of deformation damage to the outer pipe should be controlled at a low level.

[0245] The bulging part 112 is provided at the second end of the connecting pipe (or the non-bulging part 113). Therefore, when the connecting pipe is connected to the outer pipe 150, the bulging part 112, specifically the second-end port of the bulging part 112 (or the second pressure-bearing surface 112b), is first pressed into the outer pipe 150; in order to prevent the port from shrinking and deforming under the impact of the oncoming fluid in the outer pipe 150, separating from the inner wall of the outer pipe, and obstructing fluid flow, etc., the end face 112d of this port is designed as a conical curved surface. In the direction along the connecting pipe and pointing to its second end, the inner diameter of the port shows an increasing trend; in this way, at the second-end port of the bulging part, the inner diameter of the pipe becomes larger and the flow rate slows down, and the impact force of the fluid weakens. More importantly, the end face 112d of the conical curved surface has a certain inclination, and the impact force of the oncoming fluid will push and press the end face 112d, causing the end face 112d to expand outwards and the second pressure-bearing surface 112b to closely adhere to the inner wall of the outer pipe, without the situation of port shrinkage deformation, separation from the inner wall of the outer pipe, and obstruction of fluid flow.

[0246] The connection between the above-mentioned connecting pipe and the external pipe entirely relies on the frictional force between the two to maintain, and this kind of connection is not reliable. When the fluid flow rate is relatively large or under the action of other large external forces, the two may be separated, let alone sealed. In order to make the connection between the connecting pipe and the external pipe firm and stable, the present invention respectively sets a fastening bolt and a fastening nut on both sides of the bulging part pressed into the external pipe. When the fastening bolt and the fastening nut are screwed tightly, the two will respectively clamp and push and press the bulging part pressed into the external pipe from both sides of the bulging part (or the connection part). The bulging part and the external pipe on its outer layer are firmly pressed together and cannot slip off from the fastening bolt or the fastening nut, thereby fixing the connection between the connecting pipe and the external pipe and ensuring the stability of the connection. At the same time, multiple seals are formed at the connection between the connecting pipe and the external pipe, ensuring the high efficiency and stability of the seal.

[0247] In the present invention, a pair of fastening bolts and fastening nuts (that is, one fastening bolt and one matching fastening nut) need to be set at the connection between each connecting pipe and the external pipe or at the bulging part pressed into the external pipe to clamp and push and press the bulging part pressed into the external pipe and fix the connection between the connecting pipe and the external pipe. Therefore, the number of fastening bolts and fastening nuts equipped in the pipe connection device can be determined according to the number of connecting pipes or bulging parts. In this embodiment, the connection body 110 has three connecting pipes (or three bulging parts 112). Therefore, the pipe connection device 100 can be configured with three pairs of fastening bolts and fastening nuts (for the sake of simplifying the drawing, Figure 1 、 2 only the situation where the fastening bolts and fastening nuts are set at one of the connection parts or bulging parts is shown in the figure, and the setting situations at other connection parts or bulging parts are not shown). The fastening bolts will be introduced in detail below.

[0248] In the present invention, the fastening bolt is sleeved on the connecting pipe. Specifically, it is sleeved on the non-bulging part, and the fastening bolt is placed on the first side of the bulging part. Each fastening bolt further includes a bolt body and a bolt clamping pipe, as Figure 5 shown.

[0249] The bolt body 120 has a bolt rod 121, a bolt head 122, a bolt through hole 123, and a limiting part 124, as Figure 6 shown. The outer wall of the bolt rod 121 is provided with a thread structure for cooperating with the fastening nut 140 for threaded connection. The bolt head 122 is located at the first end of the bolt rod. In this embodiment, the bolt head 122 can be designed as a polygon, which is convenient for personnel to operate and hold or cooperate with auxiliary tools for screwing operations. In this embodiment, the thread structure of the fastening bolt is provided on the outer wall of the second end of the bolt rod 121.

[0250] A bolt through-hole 123 is formed inside the bolt body 120; the bolt through-hole 123 is arranged along the direction of the fastening bolt and penetrates through the bolt body 120 (i.e., penetrates through the bolt rod 121 and the bolt head 122); the aperture of the bolt through-hole 123 > the maximum outer diameter R of the bulged portion, so that the bolt body 120 can pass through the bulged portion 112 from the second end of the connecting pipe and be sleeved on the non-bulged portion 113, placing the bolt body 120 on the first side of the bulged portion 112.

[0251] The limiting portion 124 is located inside the bolt body 120 (or the bolt through-hole 123) and is used to carry the bolt clamping pipe. In the present invention, the limiting portion has at least a limiting body and a central hole; wherein, the limiting body is arranged on the inner wall of the bolt body (or the hole wall of the bolt through-hole) along the circumferential direction, and at least the outer diameter of the bolt clamping pipe > the aperture of the central hole, so that the limiting portion can carry the bolt clamping pipe through the limiting body; the central hole is located at the central position of the limiting body, then the aperture of the central hole < the aperture of the bolt through-hole, and the aperture of the central hole > the maximum outer diameter R of the bulged portion, so that the bolt body 120 can pass through the bulged portion 112 from the second end of the connecting pipe and be sleeved on the non-bulged portion 113, placing the bolt body 120 on the first side of the bulged portion 112.

[0252] As Figure 6 and Figure 7 As shown, in this embodiment, the limiting portion 124 is of an annular structure, the limiting body 124a is an annular body of the annular structure, and the central hole 124b is an annular hole of the annular structure. The outer diameter of the bolt clamping pipe 130 > the inner diameter of the bolt clamping pipe 130 ≥ the aperture of the central hole 124b. In this embodiment, the limiting portion 124 (or the limiting body 124a) is arranged on the inner wall of the first end of the bolt body 120; arranging the limiting portion at the first end of the bolt body has the effect of blocking larger impurities and foreign objects from entering the bolt through-hole, and the overall structure of the bolt body is beautiful and generous, and it is easy to demold and manufacture. In the present invention, the bolt rod 121, the bolt head 122 and the limiting portion 124 of the bolt body can be integrally formed.

[0253] In the present invention, the aperture of the bolt through-hole > the aperture of the central hole > the maximum outer diameter R of the bulged portion, so that the bolt body 120 can pass through the bulged portion 112 from the second end of the connecting pipe and be sleeved on the non-bulged portion 113, placing the bolt body 120 on the first side of the bulged portion 112. However, this also means that the bolt body 120 itself does not have the ability to clamp and press the bulged portion 112. In the present invention, the bolt clamping pipe is used to achieve the clamping and pressing effects on the bulged portion and its outer layer of the outer pipe.

[0254] In the present invention, the bolt clamping tube is a tube structure formed by splicing or fitting, which can surround the connecting tube. Specifically, it surrounds the non-bulging part or the outer tube of the non-bulging part to splice or fit to form a tube structure. In this way, the bolt clamping tube can be directly arranged on the first side of the bulging part, without passing through the second end of the connecting tube, passing through the bulging part, and sleeving on the non-bulging part 113. The bolt clamping tube has a first clamping part, and the bolt clamping tube clamps and presses the bulging part pressed into the outer tube through the first clamping part. The first clamping part is a circular ring structure.

[0255] In the present invention, the aperture of the central hole < the outer diameter of the bolt clamping tube ≤ the aperture of the bolt through-hole. The outer diameter of the bolt clamping tube ≤ the aperture of the bolt through-hole, so that the bolt clamping tube or its clamping wall can be inserted into the bolt through-hole 123 (or the bolt body 120); the outer diameter of the bolt clamping tube > the aperture of the central hole, so that the bolt clamping tube or its clamping wall inserted into the bolt through-hole 123 (or the bolt body 120) reaches the limiting body 124a, and at least the outer end face of its first end can be carried on the limiting body. The limiting body bears the bolt clamping tube and blocks the movement of the bolt clamping tube. The limiting part limits and supports the bolt clamping tube through the limiting body.

[0256] In the present invention, the first composite outer diameter R1 ≤ the inner diameter of the first clamping part < the second composite outer diameter R2, where the first composite outer diameter R1 is the outer diameter at the non-bulging part of the outer tube pressed in, that is, the first composite outer diameter R1 = the outer diameter r of the non-bulging part + the wall thickness d of the outer tube, as Figure 3 shown; the second composite outer diameter R2 is the outer diameter at the maximum of the bulging part of the outer tube pressed in, that is, the second composite outer diameter R2 = the maximum outer diameter R of the bulging part + the wall thickness d of the outer tube, and the second composite outer diameter R2 > the first composite outer diameter R1. The inner diameter of the first clamping part ≥ the first composite outer diameter R1, so that the bolt clamping tube or its tube wall can directly splice or fit to form a tube structure on the first side of the bulging part 112, surrounding the non-bulging part 113 or the outer tube 150 of the non-bulging part; the inner diameter of the first clamping part < the second composite outer diameter R2, so that the bolt clamping tube is located on the first side of the bulging part and cannot pass through the bulging part 112 of the outer tube pressed in. The bolt clamping tube can clamp and press the bulging part of the outer tube pressed in through the first clamping part.

[0257] In this embodiment, the bolt clamping tube 130 is a tube structure formed by splicing two clamping walls 131 and 132. The outer diameter of the bolt clamping tube 130 = the aperture of the bolt through-hole 123, the inner diameter of the bolt clamping tube 130 ≥ the aperture of the central hole 124b, and the inner diameter of the bolt clamping tube 130 = the first composite outer diameter R1.

[0258] The outer diameter of the bolt clamp tube 130 (also the outer diameter of the clamp tube walls 131, 132) = the hole diameter of the bolt through hole 123, so the clamp tube walls 131, 132 can be inserted into the bolt through hole 123, and the outer walls of the clamp tube walls 131, 132 are tightly fitted with the inner wall of the bolt body 120 (i.e., the hole wall of the bolt through hole). Figure 5 and Figure 7 As shown, the bolt body 120 can clamp the bolt clamp tube 130 formed by assembly through its inner wall (or the bolt through hole 123 can clamp the bolt clamp tube 130 through its hole wall), and the clamp tube walls 131 and 132 are tightly assembled together to maintain the tube structure state, and the tube structure is stable and fixed without looseness or shaking.

[0259] The outer diameter of the bolt clamping tube 130> the inner diameter of the bolt clamping tube 130≥ the diameter of the center hole 124b, so the bolt clamping tube 130 or its clamping tube wall in the bolt through hole 123 (or the bolt body 120) reaches the limit body 124a, and the entire end surface of the first end (including the outer end surface 130w and the inner end surface 130n) is on the limit body 124a. Figure 7 As shown, the limiting body limits and supports the bolt clamp tube; the second end of the bolt clamp tube is arranged flush with the second end of the bolt body (also the second end of the bolt rod). In this embodiment, the tube length of the bolt clamp tube 130 is equal to the distance from the limiting portion 124 to the second end of the bolt body.

[0260] The inner diameter of the bolt clamp tube 130 = the first composite outer diameter R1 (< the second composite outer diameter R2), so the clamp tube walls 131, 132 can be assembled on the first side of the bulging portion 112, around the non-bulging portion 113 or the outer layer of the outer tube 150 to form a tube structure, and the formed bolt clamp tube 130 itself cannot be pressed into the bulging portion 112 of the external tube, and the bolt clamp tube can be clamped and pushed into the bulging portion of the external tube through its second end. Therefore, in this embodiment, the second end of the bolt clamp tube is used as the first clamping portion 133, and the second end of the bolt clamp tube is close to the bulging portion and can be regarded as a circular ring structure, and its inner wall is a tubular curved surface or a cylindrical curved surface. In this embodiment, the bolt clamp tube 130 has a simple structure and is easy to manufacture.

[0261] At the non-bulging part between the bolt body (sleeved on the non-bulging part 113) and the bulging part, the clamping pipe walls 131 and 132 surround the non-bulging part 113 or the outer pipe 150 of its outer layer to form the bolt clamping pipe 130 by splicing, and are inserted into the bolt body 120 along the non-bulging part 113 to form a fastening bolt; alternatively, at the non-bulging part between the bolt body (sleeved on the non-bulging part 113) and the bulging part, the clamping pipe walls 131 and 132 are respectively inserted into the bolt body 120 along the non-bulging part 113 and are spliced in the bolt through-hole 123 to form the bolt clamping pipe 130 to form a fastening bolt. The formed fastening bolt is sleeved on the connecting pipe, more precisely, on the non-bulging part 113, and is located on the first side of the bulging part.

[0262] At the non-bulging part between the bolt body (sleeved on the non-bulging part 113) and the bulging part, the bolt clamping pipe or its clamping pipe walls are inserted into the bolt through-hole, which means that the pipe length of the bolt clamping pipe or its clamping pipe walls ≤ the maximum pipe length of the non-bulging part between the bolt body (sleeved on the non-bulging part) and the bulging part, so that the non-bulging part has enough space to accommodate the bolt clamping pipe or each clamping pipe wall and insert it (from the second end of the bolt body) into the bolt through-hole.

[0263] In the present invention, each clamping pipe wall of the bolt clamping pipe is an arc-shaped pipe wall and has the same length. In this embodiment, the arc sizes of the clamping pipe walls 131 and 132 are different. Among them, the clamping pipe wall 131 is a pipe wall of 1 / 3 arc (corresponding central angle is 240°), and the clamping pipe wall 132 is a pipe wall of 2 / 3 arc (corresponding central angle is 120°). The clamping pipe walls 131 and 132 can just form a pipe structure (i.e., the bolt clamping pipe 130) when spliced together, as Figure 8 shown. It should be noted that in this embodiment, the two clamping pipe walls 131 and 132 can also be pipe walls of 1 / 4 arc and 3 / 4 arc respectively, or can also be pipe walls of 2 / 5 arc and 3 / 5 arc respectively. This embodiment does not limit the arc sizes of each clamping pipe wall of the bolt clamping pipe, nor does it limit in other related examples. It can be designed according to the actual application situation as long as each clamping pipe wall can just form a pipe structure (bolt clamping pipe) together.

[0264] In this embodiment, the clamping pipe wall 131 has two side surfaces 131a and 131b, and the clamping pipe wall 132 has two side surfaces 132a and 132b; the bolt clamping pipe 130 formed by splicing the clamping pipe wall 131 and the clamping pipe wall 132 has two adjacent joints, where one adjacent joint side surface 131a is closely spliced with the side surface 132a, and the other adjacent joint side surface 131b is closely spliced with the side surface 132b (or one adjacent joint side surface 131a is closely spliced with the side surface 132b, and the other adjacent joint side surface 131b is closely spliced with the side surface 132a). The fastening nut will be introduced in detail below.

[0265] In the present invention, the fastening nut 140 is sleeved on the outer tube 150, and the fastening nut 140 is placed on the second side of the bulging portion; each fastening nut 140 includes a nut body 142 and a second clamping portion 141, wherein the second clamping portion 141 is located inside the nut body 142; a thread structure is provided on the inner wall of the nut body 142 for mating with the thread structure of the fastening bolt for threaded connection. Anti-slip edges may also be provided on the outer wall of the nut body 142 to facilitate the operation and gripping by personnel or to cooperate with auxiliary tools for screwing operations, as Figure 9 shown. The second clamping portion 141 is located on the second side of the thread structure of the nut body, and the second clamping portion 141 is used to clamp and press the bulging portion pressed into the outer tube. The second clamping portion 141 is a circular ring structure, and this circular ring structure is arranged on the inner wall of the nut body 142 along the circumferential direction. In this embodiment, the inner wall of the second clamping portion 141 is a tubular curved surface or a cylindrical curved surface; the second clamping portion 141 is arranged at the second end of the nut body 142, which has the effect of preventing impurities and foreign objects from entering the nut body, and is beautiful and generous and easy to demold and manufacture. In the present invention, the second clamping portion 141 and the nut body 142 can be integrally formed.

[0266] The inner diameter of the second clamping portion 141 ≥ the outer diameter of the outer tube 150, so that the outer tube 150 can pass through the second clamping portion 141 and the fastening nut 140 can be sleeved on the outer tube 150.

[0267] The inner diameter of the second clamping portion 141 < the second composite outer diameter R2, and the second composite outer diameter R2 is the outer diameter at the largest part of the bulging portion pressed into the outer tube, that is, the second composite outer diameter R2 = the largest outer diameter R of the bulging portion + the wall thickness d of the outer tube; in this way, when the outer tube 150 is connected to the connecting tube, the fastening nut 140 (sleeved on the outer tube) is located on the second side of the bulging portion 112 and cannot pass through the bulging portion 112, and the fastening nut 140 can be clamped and pushed by the second clamping portion 141 into the bulging portion of the outer tube.

[0268] In this embodiment, the bulging portion 112 and the non-bulging portion connected thereto are both pressed into the outer tube 150. The connecting tube is connected to the outer tube 150. The fastening bolt sleeved on the non-bulging portion 113 and the fastening nut 140 sleeved on the outer tube 150 are screwed tightly. In this way, on the first side of the bulging portion 112, the first clamping portion 133 (or the second end of the bolt clamping tube), specifically, the inner edge 133o of the first clamping portion, will be stuck on the first pressure-bearing surface 112a of the bulging portion, so that the fastening bolt (or the bolt clamping tube 130) cannot pass through the bulging portion 112, and the bulging portion cannot slip out from the fastening bolt. The fastening bolt clamps and presses the bulging portion pressed into the outer tube through the inner edge 133o. Here, the outer tube 150 and the first pressure-bearing surface 112a are tightly pressed together and fit tightly with each other, so as to form a seal I between the first pressure-bearing surface 112a and the outer tube; on the second side of the bulging portion 112, the second clamping portion 141, specifically, the inner edge 141o of the second clamping portion, will be stuck on the second pressure-bearing surface 112b of the bulging portion, so that the fastening nut 140 cannot pass through the bulging portion 112, and the bulging portion cannot slip out from the fastening nut. The fastening nut 140 clamps and presses the bulging portion pressed into the outer tube through the inner edge 141o. Here, the outer tube 150 and the second pressure-bearing surface 112b are tightly pressed together and fit tightly with each other, so as to form a seal II between the second pressure-bearing surface 112b and the outer tube.

[0269] The fastening bolt and the fastening nut 140 on both sides of the bulging portion are screwed tightly, applying pushing and pressing forces in opposite directions to the connection (between the connecting tube and the outer tube 150) or the bulging portion pressed into the outer tube, so as to clamp and fix the bulging portion and the outer tube outside it, fix the connection between the connecting tube and the outer tube, and at the same time form multiple seals at the connection between the connecting tube and the outer tube, ensuring the high efficiency and stability of the seal.

[0270] The tube connection device provided by the present invention and the outer tube 150 can both be prepared from synthetic resin; the present invention does not limit the specific resin material selected, nor does it limit that in other related examples, it can be selected according to the actual application situation.

[0271] For example, the connection body 110, the fastening bolt (including the bolt body 120 and the bolt clamping tube 130), the fastening nut 140, and the external tube 150 can be made of any one or more synthetic resins such as PFA (tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, also known as perfluoroalkylated substance, soluble polytetrafluoroethylene), PTFE (polytetrafluoroethylene), PVDF (polyvinylidene fluoride), ETFE (tetrafluoroethylene-ethylene copolymer), FEP (tetrafluoroethylene-hexafluoropropylene copolymer), PVC (polyvinyl chloride), PP (polypropylene), PE (polyethylene), PCTFE (polychlorotrifluoroethylene), PEEK (polyetheretherketone), PSU (bisphenol A polysulfone), PPSU (polyphenylene sulfone), and PESU, PES (polyethersulfone). In particular, the tube connection device and the external tube made entirely of PFA have better chemical resistance than resins of other materials. The tube connection device made of PFA has good high-temperature resistance, low permeability, and cleanliness, and can ensure the reliable and stable operation of the entire pipeline system under extreme temperature conditions. Therefore, the tube connection device provided by the present invention and made of PFA is widely used in technical fields such as semiconductor, liquid crystal display panel, photovoltaic, biotechnology, pharmaceutical, medical equipment, microelectronics, optics, disk, automotive industry, and aviation and aerospace fields, and is particularly suitable for fluid media with strong corrosiveness and high purity requirements.

[0272] In this embodiment, the connection method between the tube connection device 100 and the external tube 150 includes the following steps:

[0273] The bolt body 120 passes through the second end of the connecting tube, passes through the bulging portion 112, and is sleeved on the non-bulging portion 113;

[0274] The fastening nut 140 is sleeved on the external tube 150;

[0275] The bulging portion 112 and the non-bulging portion connected thereto are both pressed into the external tube 150, and the external tube is in an expanded diameter state. A connection is formed between the connecting tube and the external tube, and the fastening nut 140 is located on the second side of the bulging portion 112;

[0276] At the non-bulging portion between the bolt body 120 and the bulging portion 112, the clamping tube walls 131, 132 surround the non-bulging portion 113 or the external tube 150 on its outer layer and are joined to form the bolt clamping tube 130, and the bolt clamping tube 130 is installed in the bolt through hole 123 along the non-bulging portion 113 to form a fastening bolt; alternatively, at the non-bulging portion between the bolt body 120 and the bulging portion 112, the clamping tube walls 131, 132 are respectively installed in the bolt body 120 along the non-bulging portion 113 and are joined in the bolt through hole 123 to form the bolt clamping tube 130 to form a fastening bolt; the formed fastening bolt is sleeved on the non-bulging portion 113 and is located on the first side of the bulging portion 112;

[0277] Screw the fastening bolts and fastening nuts 140 on both sides of the bulging part tightly in a spiral manner, and apply pushing forces in opposite directions to the connection part (between the connecting pipe and the outer pipe 150) or the bulging part pressed into the outer pipe through the fastening bolts and fastening nuts, so as to fix the connection between the connecting pipe and the outer pipe, and at the same time form multiple seals at the connection part;

[0278] The operation sequence of the above steps can be appropriately adjusted without affecting other steps;

[0279] Repeat the above operations to connect and fix other connecting pipes to the outer pipe.

[0280] In this embodiment, the disassembly method between the pipe connection device 100 and the outer pipe 150 includes the following steps:

[0281] Unscrew the fastening bolts and fastening nuts 140 in a spiral manner;

[0282] The connecting pipe withdraws from the outer pipe 150 and is disassembled from the outer pipe 150;

[0283] The fastening bolt separates from the non-bulging part and the bulging part 112, and takes out the bolt pipe clamp 130 or its pipe clamp walls 131, 132 from the bolt through-hole 123 (or the bolt body 120);

[0284] The bolt body 120 is taken off from the second end of the connecting pipe through the bulging part 112;

[0285] Take off the fastening nut 140 from the outer pipe 150;

[0286] The operation sequence of the above steps can be appropriately adjusted without affecting other steps;

[0287] Repeat the above operations to disassemble and separate other connecting pipes from the outer pipe.

[0288] In the present invention, by arranging a bolt pipe clamp formed by splicing inside the bolt body, the fastening bolt can be placed on the first side of the bulging part 112, and at the same time can clamp and push the bulging part pressed into the outer pipe. The fastening bolts on both sides of the bulging part and the fastening nuts are screwed tightly in a spiral manner, so as to clamp and fix the bulging part and the outer pipe on its outer layer, make the connection between the connecting pipe and the outer pipe fixed, ensure the stability of the connection, and at the same time form multiple seals at the connection part between the connecting pipe and the outer pipe, ensuring the high efficiency and stability of the seal. The pipe connection device 100 provided by the present invention has excellent connection and sealing effects, and the device has a simple structure, is convenient for disassembly and assembly, and has good market prospects.

[0289] Embodiment 2

[0290] For the above-mentioned first embodiment, the connection body 110 is a tee-shaped pipe connection structure, which has a cavity 111 and three connecting pipes. The cavity 111 communicates with each connecting pipe, and each connecting pipe can be respectively connected to different external pipes. In this way, a passage is formed between different external pipes through the connection of the connection body; the pipe connection device 100 can be configured with three pairs of fastening bolts and fastening nuts.

[0291] The main difference from the first embodiment is that: in the second embodiment, the connection body 210 is a two-way pipe connection structure, and the connection body 210 has two connecting pipes; in the second embodiment, the pipe connection device can be configured with two pairs of fastening bolts and fastening nuts.

[0292] As Figure 10 shown, in this embodiment, the connection body 210 is a straight-through pipe connection structure and the diameters of the connecting pipes are the same; the two connecting pipes are directly connected. Therefore, it can be considered that the connection body 210 has no cavity, or the pipe part in the middle of the connection body 210 can be regarded as its cavity. A pair of fastening bolts and fastening nuts are required to be arranged at the connection of each connecting pipe and the external pipe to fix the connection. Therefore, its pipe connection device can be configured with two pairs of fastening bolts and fastening nuts. It should be noted that in this embodiment, the connection body 210 can also be a right-angled or any other angled two-way pipe connection structure, and the diameters of the connecting pipes can also be different. This embodiment does not limit the shape of the two-way pipe connection structure and the diameter size of its connecting pipes, etc., nor does it limit that in other related examples, it can be designed according to the actual application situation.

[0293] The connection body 210 can realize functions such as connection and turning between two fluid pipelines, meeting the requirements of different spatial pipe layout. In the second embodiment, for the structures and materials of the fastening bolts (including the bolt body and the bolt pipe clamp), the fastening nuts, and the external pipes, reference can be made to the first embodiment, which will not be elaborated here.

[0294] According to the above deformation method, further expansion can be made as follows:

[0295] As Figure 11 shown, the connection body 210 is a four-way pipe connection structure, which can realize functions such as connection, turning, diversion or confluence between multiple fluid pipelines, and is applicable to the intersection of pipeline systems. The connection body 210 has a cavity 211 and four connecting pipes. The cavity 211 communicates with each connecting pipe, and each connecting pipe can be respectively connected to different external pipes. In this way, a passage is formed between different external pipes through the connection of the connection body; a pair of fastening bolts and fastening nuts are required to be arranged at the connection of each connecting pipe and the external pipe to fix the connection. Therefore, its pipe connection device can be configured with four pairs of fastening bolts and fastening nuts.

[0296] In this embodiment, the connection body 210 is a cross-shaped connection structure and the diameters of the connecting pipes are not completely the same. AsFigure 11 As shown; it should be noted that the connecting body 210 can also be other four-way pipe connection structures, and the diameters of the connecting pipes can also be the same. This embodiment does not limit the shape of the four-way pipe connection structure, the diameter size of the connecting pipes, etc., nor does it limit that in other related examples, it can be designed according to the actual application situation. In this embodiment, the fastening bolts (including the bolt body and the bolt pipe clamp), the fastening nuts, the structure and material of the external pipe, etc., can all refer to Embodiment 1 and will not be elaborated here.

[0297] Optionally, a valve body (not shown in the figure) can be provided in the cavity 211 to control the connection or disconnection between each connecting pipe and the cavity 211, adjust parameters such as the flow rate and pressure of the fluid, and control the connection and disconnection of any two external pipes; the material of the valve body can be the same as that of the connecting body.

[0298] It is worth noting that the connecting body in the present invention can also be other multi-way pipe connection structures to meet more complex pipe layout requirements and can be designed according to needs in actual applications.

[0299] Embodiment 3

[0300] For the above-mentioned Embodiment 1, the bulging part 112 has a first pressure-bearing surface 112a, a second pressure-bearing surface 112b and a third pressure-bearing surface 112c.

[0301] The main difference from Embodiment 1 is that in this Embodiment 3, the bulging part 312 has a first pressure-bearing surface 312a and a second pressure-bearing surface 312b.

[0302] As Figure 12 As shown, in this embodiment, the bulging part 312 is arranged at the second end of the connecting pipe. The bulging part 312 has a first pressure-bearing surface 312a and a second pressure-bearing surface 312b, and there is no third pressure-bearing surface. The maximum outer diameter of the first pressure-bearing surface 312a and the second pressure-bearing surface 312b is the maximum outer diameter R of the bulging part. The maximum outer diameter of the first pressure-bearing surface 312a (or the second pressure-bearing surface 312b) replaces the third pressure-bearing surface in Embodiment 1 to form a seal III with the external pipe 150.

[0303] Therefore, in this embodiment, a triple seal can still be formed at the connection between each connecting pipe and its external pipe or at the bulging part pressed into the external pipe, meeting the sealing requirements at the connection and ensuring the stability of the sealing performance. In this embodiment, a seal I is formed between the first pressure-bearing surface 312a and the external pipe, and a seal II is formed between the second pressure-bearing surface 312b and the external pipe. For details, please refer to Embodiment 1. In this Embodiment 3, the fastening bolts (including the bolt body and the bolt pipe clamp), the fastening nuts, the structure and material of the external pipe, etc., can all refer to Embodiment 1 and will not be elaborated here.

[0304] Embodiment 4

[0305] For the first embodiment described above, the outer diameter of the bolt clamping tube > the inner diameter of the bolt clamping tube ≥ the aperture of the central hole 124b, and the entire end face of the first end of the bolt clamping tube (or its outer end face 130w and inner end face 130n) is located on the limiting body 124a.

[0306] The main difference from the first embodiment is that in the fourth embodiment, the outer diameter of the bolt clamping tube > the aperture of the central hole > the inner diameter of the bolt clamping tube, and the outer end face 430w of the first end of the bolt clamping tube is located on the limiting body 424a.

[0307] In the first embodiment, (the outer diameter of the bolt clamping tube >) the inner diameter of the bolt clamping tube ≥ the aperture of the central hole. Then, for the bolt clamping tube or the tube wall inserted into the bolt through-hole, the entire end face of its first end (including the outer end face 130w and the inner end face 130n) is located on the limiting body 124a. The limiting body 124a blocks the movement of the bolt clamping tube, limits and supports the bolt clamping tube by bearing the entire end face of the first end of the bolt clamping tube. However, in the first embodiment, the end face of the bolt clamping tube or the tube wall cannot be directly contacted from the first end of the bolt body, and the bolt clamping tube or the tube wall cannot be pushed.

[0308] In this embodiment, the outer diameter of the bolt clamping tube > the aperture of the central hole > the inner diameter of the bolt clamping tube. Then, for the bolt clamping tube 430 or the tube wall inserted into the bolt through-hole, the outer end face 430w of its first end is located on the limiting body 424a, and its inner end face 430n of the first end is located in the central hole 424b, as Figure 13 shown. The limiting body 424a blocks the movement of the bolt clamping tube, limits and supports the bolt clamping tube by bearing the outer end face 430w of the first end of the bolt clamping tube. Its inner end face 430n is located in the central hole 424b. In this way, the end face of the bolt clamping tube 430 or each tube wall can be directly contacted from the first end of the bolt body, that is, the inner end face 430n located in the central hole, as Figure 13 shown. Thus, a pushing tool can be used to enter the bolt body from the first end of the bolt body, push the bolt clamping tube 430 or each tube wall, and push the bolt clamping tube 430 or each tube wall out from the second end of the bolt body (or the bolt through-hole), realizing the rapid removal of the bolt clamping tube 430 or the tube wall from the bolt body (or the bolt through-hole), which provides convenience for the disassembly and repair work of the device. The pushing tool (not shown in the figure) can be selected as an elongated object, which is convenient to extend into the central hole and the bolt through-hole, reach and push the bolt clamping tube or its tube wall.

[0309] In this embodiment, the outer diameter of the bolt clamping tube > the diameter of the central hole > the inner diameter of the bolt clamping tube, so that while the limiting part realizes the bearing and limiting of the bolt clamping tube, it also enables the bolt clamping tube 430 or its clamping tube wall to be quickly removed from the bolt body (or bolt through-hole), which is of great significance for the disassembly and maintenance work during the use of the device. In the fourth embodiment, for the structures and materials of the connecting body, fastening nut, and external tube, reference can be made to the first embodiment, which will not be elaborated here.

[0310] Embodiment Five

[0311] For the above-mentioned first embodiment, the limiting part 124 is a circular ring structure, having a limiting body 124a and a central hole 124b. Among them, the limiting body 124a is a ring body of a circular ring structure, and the central hole 124b is a ring hole of a circular ring structure.

[0312] The main difference from the first embodiment is that: in this fifth embodiment, in addition to the limiting body 524a and the central hole 524b, the limiting part also has a plurality of through holes 524c. Among them, the through holes 524c are opened on the limiting body 524a (or the ring body of the circular ring structure) (reference can be made to Figure 14 in (2)); the bolt clamping tube or each clamping tube wall corresponds to at least one through hole 524c, and part of the end face is at its corresponding through hole (reference can be made to Figure 14 in (3)).

[0313] In the first embodiment, for the bolt clamping tube or each clamping tube wall inserted into the bolt through-hole, the entire end face (including the inner end face and the outer end face) of the first end is on the limiting body 124a. The limiting body 124a blocks the movement of the bolt clamping tube and limits and supports the bolt clamping tube by bearing the entire end face of the first end of the bolt clamping tube; however, in the first embodiment, the end face of the bolt clamping tube or the clamping tube wall cannot be directly contacted from the first end of the bolt body, and the bolt clamping tube or the clamping tube wall cannot be pushed.

[0314] In this embodiment, for the bolt clamping tube or each clamping tube wall inserted into the bolt through-hole, the end face (including the inner end face and the outer end face) of the first end is still on the limiting body 524a as a whole. The limiting body 524a blocks the movement of the bolt clamping tube and limits and supports the bolt clamping tube by bearing the end face of the first end of the bolt clamping tube (reference can be made to Figure 14 in (1)); at the same time, part of the end face of the bolt clamping tube or each clamping tube wall is at at least one through hole 524c (reference can be made to Figure 14 in (3)). In this way, when the pushing tool enters the bolt body 520 from the first end of the bolt body, it can directly push the bolt clamping tube 530 or the clamping tube wall from the corresponding through hole 524c.

[0315] In the present invention, the bolt clamping tube or each clamping tube wall corresponds to at least one through hole, which means that at least one through hole needs to be opened on the limiting body. The bolt clamping tube corresponds to at least one through hole and has a partial end face at the corresponding through hole. For a bolt clamping tube formed by splicing or fitting multiple clamping tube walls, at least the corresponding number of through holes need to be opened on the limiting body, and each clamping tube wall corresponds to at least one through hole and has a partial end face at the corresponding through hole. In this way, the pushing tool can push the bolt clamping tube or each clamping tube wall from the corresponding through hole, and push the bolt clamping tube or each clamping tube wall out from the second end of the bolt body (or bolt through hole), realizing the rapid removal of the bolt clamping tube or clamping tube wall from the bolt body (or bolt through hole), which provides convenience for the disassembly and maintenance work of the device. The pushing tool (not shown in the figure) can be selected as an elongated object, which is convenient to extend into the through hole and bolt through hole, reach and push the bolt clamping tube or its clamping tube wall.

[0316] In this embodiment, the bolt clamping tube 530 has two clamping tube walls 531 and 532 with different arc lengths (the clamping tube wall 531 is a 1 / 3 circular arc, the clamping tube wall 532 is a 2 / 3 circular arc, and the arc length of the clamping tube wall 531 < the arc length of the clamping tube wall 532), then at least two through holes 524c need to be opened on the limiting body 524a. When two or more than two through holes are opened on the limiting body, the distribution of the through holes will show the following two situations:

[0317] First, the arc length between two adjacent through holes on the limiting body (or the ring body of the circular ring structure) ≥ the arc length of at least one of the clamping tube walls.

[0318] In this embodiment, the arc lengths of the clamping tube walls 531 and 532 are different. When two through holes 524c are opened on the limiting body 524a, no matter how the two through holes 524c are distributed, there will be an arc length L2 between two adjacent through holes > the arc length L1 of the clamping tube wall 531 (refer to (1) in Figure 15 ); when more than two through holes 524c are opened on the limiting body 524a and the through holes 524c are unevenly distributed in the circumferential direction, there may also be an arc length L2 between two adjacent through holes > the arc length L1 of the clamping tube wall 531 (refer to (2) in Figure 15 ). The operator cannot see through the bolt body to understand the distribution position of the internal through holes. In this way, during the process of installing the clamping tube wall into the bolt through hole, it may occur that a clamping tube wall (especially the clamping tube wall with a smaller arc length, such as the clamping tube wall 531 in this embodiment) is completely between two adjacent through holes and not at any through hole, and it does not correspond to any through hole (refer to Figure 15In the case of (1) and (2) above, when the pushing tool enters the bolt body 520 from the first end of the bolt body, it cannot directly contact the end face of the clip pipe wall through any through hole and push against the clip pipe wall, so it is impossible to push the clip pipe wall out from the second end of the bolt body (or the bolt through hole), and the meaning of opening the through hole is lost.

[0319] In the above situation 1, in order to avoid the situation where the clip pipe wall does not correspond to any through hole, the identification can be set in advance at the visible positions such as the outer wall or the end of the bolt body according to the distribution of the through holes, and the adjacent positions of each adjacent pipe wall can be specified (reference can be made to Figure 15 the position indicated by the arrow in (3) above), so that at least one through hole is opened in the limiting body area D between any two adjacent identifications, and the clip pipe wall located in the limiting body area D corresponds to at least one through hole.

[0320] Second, the arc length between any two adjacent through holes on the limiting body (or the ring body of the ring structure) < the arc length of any clip pipe wall among all the clip pipe walls forming the bolt clip pipe.

[0321] In the present invention, at least N through holes on the limiting body (or the ring body of the ring structure) are evenly distributed in the circumferential direction, so that the arc length between any two adjacent through holes can meet the requirement that < the arc length of any clip pipe wall among all the clip pipe walls forming the bolt clip pipe; where N is a positive integer, and it can be estimated according to the formula N×min(L1)≥the perimeter of the bolt clip pipe >(N - 1)×min(L1), where the perimeter of the bolt clip pipe and min(L1) are known parameters, and min(L1) is the arc length of the clip pipe wall with the smallest arc length among all the clip pipe walls forming the bolt clip pipe.

[0322] For the limiting body (or the ring body of the ring structure) provided with N or more through holes, when N through holes are evenly distributed in the circumferential direction, the arc length between two adjacent through holes among these N through holes evenly distributed in the circumferential direction < the arc length min(L1) of the clip pipe wall with the smallest arc length (reference can be made to Figure 15 the situation in (4) above), so that the arc length between any two adjacent through holes on the limiting body ≤ the arc length between two adjacent through holes among the N through holes evenly distributed in the circumferential direction < the arc length min(L1) of the clip pipe wall with the smallest arc length ≤ the arc length of any clip pipe wall among all the clip pipe walls forming the bolt clip pipe, thus realizing that the arc length between any two adjacent through holes on the limiting body < the arc length of any clip pipe wall among all the clip pipe walls forming the bolt clip pipe.

[0323] In this embodiment, the bolt pipe clip 530 is formed by splicing a clip pipe wall 531 (which is a 1 / 3 arc) and a clip pipe wall 532 (which is a 2 / 3 arc); the arc length of the clip pipe wall 531 < the arc length of the clip pipe wall 532, and the arc length L1 of the clip pipe wall 531 is the arc length min(L1) of the smallest clip pipe wall among all the clip pipe walls that form the bolt pipe clip; from the above estimation formula, it can be seen that at least three (N = 3) through holes 524c should be provided on the limiting body 524a and are evenly distributed in the circumferential direction (reference can be made to Figure 15 in Figure (4)), among the three through holes evenly distributed in the circumferential direction, the arc length L2 between two adjacent through holes < 1 / 3 arc, so among the three through holes evenly distributed in the circumferential direction, the arc length L2 between two adjacent through holes < the arc length L1 of the clip pipe wall 531, so that the arc length between any two adjacent through holes on the limiting body < the arc length of any clip pipe wall among all the clip pipe walls that form the bolt pipe clip; this means that when any clip pipe wall (including the clip pipe wall with the smallest arc length, such as the clip pipe wall 531) is inserted into the bolt through hole from any position, the end face of the first end of the clip pipe wall is at least at one through hole, and each clip pipe wall corresponds to at least one through hole; in this way, when the pushing tool enters the bolt body from the first end of the bolt body, it can directly extend to the end face of the clip pipe wall at the corresponding through hole and push the clip pipe wall out from the second end of the bolt body (or the bolt through hole), realizing the quick removal of each clip pipe wall from the bolt body (or the bolt through hole). For the materials and structures of the connection body, bolt pipe clip, fastening nut, and external pipe in this embodiment, reference can be made to Embodiment 1, which will not be elaborated here.

[0324] Embodiment Six

[0325] For the above Embodiment 1, the limiting part 124 is a circular ring structure, having a limiting body 124a and a central hole 124b. Among them, the limiting body 124a is a ring body of the circular ring structure, and the central hole 124b is a ring hole of the circular ring structure.

[0326] The main difference from Embodiment 1 is that in this Embodiment Six, the limiting part 624 is formed by a number of convex teeth distributed along the circumferential direction on the inner wall of the bolt body 620 (or the wall of the bolt through hole). The limiting part 624 has a limiting body 624a, a central hole 624b, and a gap 624c (reference can be made to Figure 16 in Figure (2)), among which, the limiting body 624a is a number of convex teeth, the central hole 624b is a hole surrounded by a number of convex teeth distributed along the circumferential direction, and the gap 624c is a gap formed between adjacent convex teeth.

[0327] Similar to the first embodiment, in the sixth embodiment, the outer diameter of the bolt clamping tube > the inner diameter of the bolt clamping tube ≥ the diameter of the central hole 624b. When the bolt clamping tube 630 or the clamping tube wall is inserted into the bolt through-hole and reaches the limiting body 624a (or the convex teeth), the outer end face and the inner end face of its first end are both on the limiting body 624a (or the convex teeth), as shown in Figure 16 shown in (3) of the figure. The limiting body 624a (or the convex teeth) blocks the movement of the bolt clamping tube by bearing the inner and outer end faces of the bolt clamping tube, and limits and supports the bolt clamping tube.

[0328] When the bolt clamping tube 630 in this embodiment is a tube structure with a tube seam, rather than formed by splicing or fitting multiple clamping tube walls (reference can be made to Figure 16 shown in (1) of the figure): Since the limiting part 624 in this embodiment has a gap 624c (or there is a gap 624c formed between the convex teeth), although no end face of the bolt clamping tube is at the central hole 624b at the first end, but part of the end face is at the gap 624c (reference can be made to the position indicated by the arrow in (3) of the figure of Figure 16 the figure). Therefore, the pushing tool can push the bolt clamping tube 630 from the gap 624c, and push the bolt clamping tube 630 out from the second end of the bolt body 620 (or the bolt through-hole), realizing the rapid removal of the bolt clamping tube 630 from the bolt body (or the bolt through-hole), which provides convenience for the disassembly and maintenance work of the device.

[0329] As can be seen from the above, when the bolt clamping tube is a tube structure with a tube seam, and the outer diameter of the bolt clamping tube > the inner diameter of the bolt clamping tube ≥ the diameter of the central hole, regardless of the arc length of the convex teeth and the gap, the limiting part can bear the bolt clamping tube and the bolt clamping tube can be rapidly removed from the bolt body.

[0330] When the bolt clamping tube 630 in this embodiment is formed by splicing or fitting multiple clamping tube walls (reference can be made to Figure 17 ): Since the limiting part 624 in this embodiment has a gap 624c (or there is a gap 624c formed between the convex teeth), if the arc length of the gap ≥ the arc length of at least one of all the clamping tube walls forming the bolt clamping tube, for example, the arc length L3 of the gap ≥ the arc length L1 of the clamping tube wall 631 (reference can be made to Figure 18 shown in (1) of the figure); the operator cannot understand the distribution position of the internal convex teeth through the bolt body. In this way, during the process of installing the clamping tube wall or the bolt clamping tube into the bolt through-hole, it may occur that there is a clamping tube wall (especially the clamping tube wall with a smaller arc length, such as the clamping tube wall 631) completely in the gap (especially the gap with a larger arc length, such as the gap with an arc length of L3), and not on any convex teeth. The clamping tube wall slips out from the gap, and there is no convex tooth to bear the clamping tube wall, limit and support it, so it is impossible to support the bolt clamping tube to clamp and push the bulging part of the external tube, and it is impossible to clamp and fix the connection between the connecting tube and the external tube.

[0331] To avoid the above-mentioned situation of the clamping tube wall slipping off, it is necessary to limit the arc length of the gap (or the arc length between two adjacent convex teeth). Specifically, the arc length of the maximum gap is designed according to the arc length min(L1) of the smallest clamping tube wall among all the clamping tube walls forming the bolt clamping tube. The designed arc length of the maximum gap max(L3) < the arc length min(L1) of the smallest clamping tube wall among all the clamping tube walls forming the bolt clamping tube (reference can be made to Figure 18 (2) therein, where the arc length L3 of the maximum gap < the arc length L1 of the smallest clamping tube wall 631), so as to achieve that the arc length of any gap (or the arc length of the maximum gap) < the arc length of any clamping tube wall (or the arc length of the smallest clamping tube wall) among all the clamping tube walls forming the bolt clamping tube; in this way, when any clamping tube wall is inserted into the bolt through-hole, since the arc length of each clamping tube wall itself is greater than the arc length of any gap, each clamping tube wall cannot slip out from any gap, and each clamping tube wall will have at least one convex tooth to bear it.

[0332] As can be seen from the above, when the bolt clamping tube is formed by splicing or fitting together multiple clamping tube walls, and the outer diameter of the bolt clamping tube > the inner diameter of the bolt clamping tube ≥ the aperture of the central hole, and at the same time the arc length of any gap < the arc length of any clamping tube wall among all the clamping tube walls forming the bolt clamping tube, regardless of the arc length of the convex teeth, the limiting part can achieve the bearing of the bolt clamping tube. For the materials and structures of the connection body, fastening nut, and external tube in this embodiment, reference can be made to Embodiment 1, which will not be elaborated here.

[0333] As a further expansion of Embodiment 6, it is as follows:

[0334] In the above-mentioned Embodiment 6, when the bolt clamping tube is formed by splicing or fitting together multiple clamping tube walls, and the outer diameter of the bolt clamping tube > the inner diameter of the bolt clamping tube ≥ the aperture of the central hole, and at the same time the arc length of any gap < the arc length of any clamping tube wall among all the clamping tube walls forming the bolt clamping tube, the limiting part can achieve the bearing of each clamping tube wall.

[0335] In the above-mentioned Embodiment 6, at the first end of the bolt clamping tube, there is no end face at the central hole 624b, and only part of the end face is at the gap 624c. The pushing tool can only push the bolt clamping tube or its clamping tube wall from the gap; for each clamping tube wall that forms the bolt clamping tube by splicing or fitting, if there is a convex tooth with an arc length ≥ the arc length of at least one of the clamping tube walls among all the clamping tube walls forming the bolt clamping tube, such as there is a convex tooth with an arc length L4 ≥ the arc length L1 of the clamping tube wall 631 (reference can be made to Figure 18In (3)); the operator cannot see through the bolt body to understand the distribution position of the internal convex teeth. During the process of inserting the pipe wall clamp or the bolt pipe clamp into the bolt through-hole, it may occur that the pipe wall clamp (especially the pipe wall clamp with a smaller arc length, such as the pipe wall clamp 631) is completely on one convex tooth (especially the convex tooth with a larger arc length, such as the convex tooth with an arc length of L4) and not at any gap. In this way, when the pushing tool enters the bolt body from the first end of the bolt body, it cannot directly contact the end face of the pipe wall clamp through the central hole or any gap to push the pipe wall clamp, and thus cannot push the pipe wall clamp out from the second end of the bolt body (or the bolt through-hole).

[0336] To avoid the situation where the pipe wall clamp is completely on one convex tooth and not at any gap as described above, it is necessary to limit the arc length of the convex teeth. Specifically, according to the arc length min(L1) of the smallest pipe wall clamp among all the pipe wall clamps forming the bolt pipe clamp, the arc length of the largest convex tooth is designed, and the arc length of the largest convex tooth < the arc length min(L1) of the smallest pipe wall clamp among all the pipe wall clamps forming the bolt pipe clamp (reference can be made to Figure 18 Figure (4) in which the arc length L4 of the largest convex tooth < the arc length L1 of the smallest pipe wall clamp 631), so as to achieve that the arc length of any convex tooth < the arc length of any pipe wall clamp among all the pipe wall clamps forming the bolt pipe clamp. In this way, when any pipe wall clamp is inserted into the bolt through-hole, since the arc length of the pipe wall clamp itself is greater than the arc length of any convex tooth, part of the end face of each pipe wall clamp and its first end will be at the gap, and the pushing tool can directly contact the end face of the pipe wall clamp through this gap to push the pipe wall clamp and push the pipe wall clamp out from the second end of the bolt body (or the bolt through-hole).

[0337] As can be seen from the above, when the bolt pipe clamp is formed by splicing or fitting multiple pipe wall clamps, and the outer diameter of the bolt pipe clamp > the inner diameter of the bolt pipe clamp ≥ the aperture of the central hole, and at the same time the arc length of any gap and the arc length of any convex tooth are both less than the arc length of any pipe wall clamp among all the pipe wall clamps forming the bolt pipe clamp, the limiting part can carry the bolt pipe clamp and the bolt pipe clamp can be quickly taken out from the bolt body.

[0338] Embodiment Seven

[0339] For the above Embodiment Four, the limiting part 124 is a circular ring structure, having a limiting body 124a and a central hole 124b. Among them, the limiting body 124a is a ring body of the circular ring structure, and the central hole 124b is a ring hole of the circular ring structure.

[0340] The main difference from Embodiment Four is that in this Embodiment Seven, the limiting part 724 is formed by a number of convex teeth distributed along the circumferential direction on the inner wall of the bolt body 720 (or the hole wall of the bolt through-hole). The limiting part 724 has a limiting body 724a, a central hole 724b, and a gap 724c (reference can be made to Figure 19In (2), the limiting body 724a is a number of convex teeth, the central hole 724b is a hole formed by the circumferential distribution of a number of convex teeth, and the gap 724c is a gap formed between adjacent convex teeth.

[0341] Similar to Embodiment 4, in Embodiment 7, the outer diameter of the bolt pipe clamp > the aperture of the central hole 724b > the inner diameter of the bolt pipe clamp. When the bolt pipe clamp 730 or the pipe wall of the clamp is inserted into the bolt through-hole and reaches the limiting body 724a (or convex teeth), the outer end face 730w of its first end is on the limiting body 724a, and the inner end face 730n is in the central hole 724b, as shown in Figure 19 (3) of the figure. The limiting body 724a (or convex teeth) blocks the movement of the bolt pipe clamp and limits and supports the bolt pipe clamp by bearing the outer end face 730w of the first end of the bolt pipe clamp; its inner end face 730n is in the central hole 724b, so that when the pushing tool enters the bolt body from the first end of the bolt body, it can directly extend to the end face of the bolt pipe clamp or each pipe wall of the clamp at the central hole 724b, and push the bolt pipe clamp or each pipe wall out from the second end of the bolt body (or bolt through-hole), realizing the rapid removal of each pipe wall from the bolt body (or bolt through-hole).

[0342] When the bolt pipe clamp 730 in this embodiment is a pipe body structure with a pipe seam, rather than formed by splicing or fitting multiple pipe walls: the inner end face 730n of the first end of the bolt pipe clamp is in the central hole 724b, and a part of the outer end face 730w is also in the gap 724c. Therefore, as shown in Figure 19 (1) of the figure, the pushing tool can push the inner end face 730n from the central hole 724b or push the outer end face 730n from the gap 724c, and push the bolt pipe clamp out from the second end of the bolt body (or bolt through-hole), realizing the rapid removal of the bolt pipe clamp from the bolt body (or bolt through-hole).

[0343] As can be seen from the above, when the bolt pipe clamp is a pipe body structure with a pipe seam, and the outer diameter of the bolt pipe clamp > the aperture of the central hole > the inner diameter of the bolt pipe clamp, regardless of the arc length of the convex teeth and the gap, the limiting part can carry the bolt pipe clamp and the bolt pipe clamp can be quickly removed from the bolt body.

[0344] In this embodiment, the bolt clamping tube 730 is formed by splicing multiple clamping tube walls: similar to the sixth embodiment above, to prevent the clamping tube walls from slipping out of the gaps, it is necessary to limit the arc length of the gaps (or rather, the arc length between adjacent convex teeth), and design the maximum arc length of the gaps max(L3) < the arc length of the smallest clamping tube wall among all the clamping tube walls forming the bolt clamping tube min(L1), so that the arc length of any gap (or rather, the maximum arc length of the gaps) < the arc length of any clamping tube wall (or rather, the arc length of the smallest clamping tube wall) among all the clamping tube walls forming the bolt clamping tube; in this way, when any clamping tube wall is inserted into the bolt through-hole, since the arc length of each clamping tube wall itself is greater than the arc length of any gap, each clamping tube wall cannot slip out from any gap, and at least one convex tooth will bear each clamping tube wall (reference can be made to the corresponding content in the sixth embodiment above).

[0345] Since the inner layer end face 730n of each clamping tube wall is at the center hole 724b at the first end, for the convex teeth bearing the clamping tube wall, even if the arc length of the convex teeth ≥ the arc length of the clamping tube wall, and the outer layer end face 730w at the first end of the clamping tube wall is just completely on the convex teeth and not at any gap, the pushing tool can directly contact the inner layer end face 730n of this clamping tube wall from the center hole 724b and push this clamping tube wall, and push this clamping tube wall out from the second end of the bolt body (or bolt through-hole); if the arc length of the convex teeth < the arc length of the clamping tube wall, the inner layer end face 730n at the first end of this clamping tube wall is at the center hole 724b, and part of its outer layer end face 730w is still at the gap 724c, so the pushing tool can push the inner layer end face 730n from the center hole 724b, or push the outer layer end face 730n from the gap 724c, and push the clamping tube wall out from the second end of the bolt body (or bolt through-hole), realizing the rapid removal of the bolt clamping tube from the bolt body (or bolt through-hole).

[0346] As can be seen from the above, when the bolt clamping tube is formed by splicing multiple clamping tube walls, and the outer diameter of the bolt clamping tube > the aperture of the center hole > the inner diameter of the bolt clamping tube, and at the same time the arc length of any gap < the arc length of any clamping tube wall among all the clamping tube walls forming the bolt clamping tube, regardless of the arc length of the convex teeth, the limiting part can bear the bolt clamping tube and the bolt clamping tube can be rapidly removed from the bolt body. For the materials and structures of the connection body, fastening nut, and external tube in this embodiment, reference can be made to Embodiment 1, which will not be elaborated here.

[0347] Embodiment Eight

[0348] For the above-mentioned Embodiment 1, each fastening bolt is provided with a bolt clamping tube 130, the bolt clamping tube 130 is placed in the bolt through-hole, the tube length of the bolt clamping tube is equal to the distance from the limiting part to the second end of the bolt body, and the tube length of the bolt clamping tube or its clamping tube wall ≤ the maximum tube length of the non-bulging part between the bolt body (sleeved on the non-bulging part) and the bulging part.

[0349] The main difference from the first embodiment is that in the eighth embodiment, two or even more bolt pipe clamps 830 can be provided for each fastening bolt. The bolt pipe clamps 830 are stacked in the bolt through-hole, and the sum of the pipe lengths of the bolt pipe clamps is equal to the distance from the limiting part to the second end of the bolt body, and the pipe length of each bolt pipe clamp or its pipe wall ≤ the maximum pipe length of the non-bulging part between the bolt body (sleeved on the non-bulging part) and the bulging part.

[0350] In the following text, let the distance from the limiting part to the second end of the bolt body be S2, the length of the bolt body be S3, and the total length of the non-bulging part be S. When the bolt body is sleeved on the non-bulging part (or the connecting pipe), the maximum pipe length of the non-bulging part between the bolt body and the bulging part is S4. Therefore, S4 = S - S3; let the pipe length of the bolt pipe clamp 130 in the first embodiment be S1, and the pipe length of the bolt pipe clamp 830 in the eighth embodiment be S1'.

[0351] In the first embodiment, a bolt pipe clamp 130 is placed in the bolt body 120 (or the bolt through-hole) to form a fastening bolt. For the bolt pipe clamp 130 in the bolt body, its first end is on the limiting part 124, and the limiting part 124 limits and supports the bolt pipe clamp 130. Its second end is flush with the second end of the bolt body 120 (i.e., the second end of the bolt rod), and serves as the first clamping part to clamp and push the bulging part 112 of the externally inserted pipe. The bolt pipe clamp 130 is located between the limiting part 124 and the second end of the bolt body, and its pipe length S1 is determined by the distance S2 from the limiting part 124 to the second end of the bolt body. In the first embodiment, the pipe length S1 of the bolt pipe clamp 130 is equal to the distance S2 from the limiting part to the second end of the bolt body, that is, S1 = S2; the bolt pipe clamp 130 or its pipe wall can be arranged in the direction of the connecting pipe between the bolt body 120 (sleeved on the non-bulging part) and the bulging part 112, and the bolt pipe clamp 130 or its pipe wall can be inserted into the bolt body 120 from the second end of the bolt body. Therefore, it is required that the pipe length S1 of the bolt pipe clamp 130 or its pipe wall is less than or equal to the maximum pipe length S4 of the non-bulging part between the bolt body (sleeved on the non-bulging part) and the bulging part (S1 ≤ S4).

[0352] In practical applications, if the distance S2 from the limiting part to the second end of the bolt body is designed to be large, and the pipe length S1 of the bolt pipe clamp 130 or its pipe wall is also large, or the installation space of the device is limited and the pipe length of the non-bulging part is designed to be small, and the maximum pipe length S4 of the non-bulging part between the bolt body (sleeved on the non-bulging part) and the bulging part is also small, then it may occur that the pipe length S1 of the bolt pipe clamp 130 or its pipe wall is greater than the maximum pipe length S4 of the non-bulging part between the bolt body (sleeved on the non-bulging part) and the bulging part (S1 > S4), such as Figure 20As shown in (1), the bolt clamping tube 130 or its clamping tube wall cannot be arranged (sleeved on the non-bulging part) between the bolt body 120 and the bulging part 112 along the direction of the connecting tube, and cannot be inserted into the bolt body 120 from the second end of the bolt body to form a fastening bolt.

[0353] To avoid the above problems and improve the assemblability of the bolt clamping tube and the bolt body, so that the bolt clamping tube can be inserted into the bolt body (or the bolt through-hole) and assembled on the non-bulging part to form a fastening bolt, in the eighth embodiment, two bolt clamping tubes 830 are provided for each fastening bolt, and the tube length S1' of the bolt clamping tube 830 has: S1' ≤ S4, S1' + S1' = S2.

[0354] In the eighth embodiment, the tube length S1' of each bolt clamping tube 830 is designed according to the maximum tube length S4 of the non-bulging part between the bolt body (sleeved on the non-bulging part) and the bulging part. The tube length S1' of the designed bolt clamping tube 830 is less than or equal to the maximum tube length S4 of the non-bulging part between the bolt body 820 (sleeved on the non-bulging part) and the bulging part 812 (S1' ≤ S4), as Figure 20 shown in (2); in this way, it is ensured that each bolt clamping tube 830 or its clamping tube wall can be arranged between the bolt body 820 (sleeved on the non-bulging part) and the bulging part 812 along the direction of the connecting tube, and each bolt clamping tube 830 or its clamping tube wall can be inserted into the bolt body 820 (or the bolt through-hole) from the second end of the bolt body along the connecting tube. In the eighth embodiment, when the two bolt clamping tubes 830 are assembled with the bolt body 820, one of the bolt clamping tubes 830 can be first inserted into the bolt through-hole, and then the other bolt clamping tube 830 can be inserted into the bolt through-hole. The two bolt clamping tubes 830 are sequentially inserted into the bolt through-hole and stacked in the bolt through-hole.

[0355] In the eighth embodiment, the sum of the tube lengths S1' of each bolt clamping tube 830 is designed according to the distance S2 from the limiting part to the second end of the bolt body. The sum of the tube lengths S1' of the designed bolt clamping tubes 830 is equal to the distance S2 from the limiting part to the second end of the bolt body (S1' + S1' = S2), then the tube length S1' of each bolt clamping tube 830 is less than the distance S2 from the limiting part to the second end of the bolt body (S1' < S2); in this way, the two bolt clamping tubes 830 stacked in the bolt through-hole, and their whole is still located between the limiting part 824 and the second end of the bolt body. The first end of the whole is on the limiting part 824, and the limiting part 824 limits and supports the two stacked bolt clamping tubes 830. The second end is flush with the second end of the bolt body 820 (i.e., the second end of the bolt rod) and serves as the first clamping part to clamp and push the bulging part of the externally pressed tube; the two bolt clamping tubes 830 provided in the eighth embodiment can equivalently replace the bolt clamping tube 130 in the first embodiment to perform functions such as clamping and pushing.

[0356] It should be noted that in this embodiment, the fastening bolt may also have three or even more bolt pipe clamps 830. The pipe lengths of the bolt pipe clamps 830 may be equal or unequal, as long as the pipe length S1' of each bolt pipe clamp 830 satisfies S1' ≤ the maximum pipe length S4 of the non-bulging part between the bolt body 820 (sleeved on the non-bulging part) and the bulging part 812, and the sum of the pipe lengths S1' of each bolt pipe clamp 830 is equal to the distance S2 from the limiting part to the second end of the bolt body. The present invention does not make specific limitations on the number and pipe length of the bolt pipe clamps in the fastening bolt, nor does it limit in other related embodiments, and can be designed according to actual applications.

[0357] In the eighth embodiment, the distance S2 from the limiting part to the second end of the bolt body remains unchanged. By providing two or more bolt pipe clamps for each fastening bolt, the pipe length of each bolt pipe clamp is shortened; the pipe length of each bolt pipe clamp is designed according to the maximum pipe length S4 of the non-bulging part between the bolt body 820 (sleeved on the non-bulging part) and the bulging part 812 and the distance S2 from the limiting part to the second end of the bolt body. Specifically, the pipe length S1' of each bolt pipe clamp satisfies S1' ≤ the maximum pipe length S4 of the non-bulging part between the bolt body 820 (sleeved on the non-bulging part) and the bulging part 812, and the sum of the pipe lengths of each bolt pipe clamp is equal to the distance S2 from the limiting part to the second end of the bolt body. In this way, regardless of the size relationship between the distance S2 from the limiting part to the second end of the bolt body in the pipe connection device and the maximum pipe length S4 of the non-bulging part between the bolt body (sleeved on the non-bulging part) and the bulging part 812, the assembly of the bolt pipe clamp and the bolt body can be ensured, and a fastening bolt can be assembled on the non-bulging part, solving the assembly problem between the limiting part and the bolt body; in the eighth embodiment, by providing two or more bolt pipe clamps for each fastening bolt to shorten the pipe length of each bolt pipe clamp, the assemblability and application range of the bolt pipe clamp are improved. For the material and structure of the connection body, fastening nut, and external pipe in this embodiment, reference can be made to the first embodiment, which will not be elaborated here.

[0358] Embodiment Nine

[0359] For the above-mentioned first embodiment, the limiting part is located inside the bolt body 120 (or the bolt through-hole 123). Specifically, it is provided on the inner wall of the first end of the bolt body 120.

[0360] The main difference from the first embodiment is that in the ninth embodiment, the limiting part is moved or extended towards the second end of the bolt body, shortening the distance from the limiting part to the second end of the bolt body so that it is not greater than the maximum pipe length of the non-bulging part between the bolt body (sleeved on the non-bulging part) and the bulging part.

[0361] In the following text, the length of the bolt body is S3, the total length of the non-bulging part is S. When the bolt body is sleeved on the non-bulging part (or the connecting pipe), the maximum pipe length of the non-bulging part between the bolt body and the bulging part is S4. Therefore, S4 = S - S3. The pipe length of the bolt pipe clamp 130 in the first embodiment is S1, and the distance from the limiting part to the second end of the bolt body is S2. In the ninth embodiment, the pipe length of the bolt pipe clamp 930 is S1", and the distance from the limiting part to the second end of the bolt body is S2".

[0362] In the first embodiment, if the distance S2 from the limiting part to the second end of the bolt body is designed to be relatively large, and the pipe length S1 of the bolt pipe clamp 130 or its clamping pipe wall is also relatively large, or the installation space of the device is limited and the pipe length of the non-bulging part is designed to be relatively small, then the maximum pipe length S4 of the non-bulging part between the bolt body (sleeved on the non-bulging part) and the bulging part is also relatively small. In this case, it is possible that the pipe length S1 of the bolt pipe clamp 130 or its clamping pipe wall is greater than the maximum pipe length S4 of the non-bulging part between the bolt body (sleeved on the non-bulging part) and the bulging part (S1 > S4). As shown in Figure 21 (1) below, the bolt pipe clamp 130 or its clamping pipe wall cannot be arranged in the direction of the connecting pipe between the bolt body 120 (sleeved on the non-bulging part) and the bulging part 112, and cannot be inserted into the bolt body 120 from the second end of the bolt body to form a fastening bolt.

[0363] Regarding the above problems, in the eighth embodiment, the distance S2 from the limiting part to the second end of the bolt body is kept unchanged, and the assembly of the bolt pipe clamp and the bolt body is achieved by setting two or more bolt pipe clamps for each fastening bolt and shortening the pipe length of each bolt pipe clamp. The ninth embodiment provides another new technical solution.

[0364] In the ninth embodiment, it is maintained that each fastening bolt is provided with a bolt pipe clamp. By moving or extending the limiting part towards the second end of the bolt body, the distance S2" from the limiting part to the second end of the bolt body is shortened and made not greater than the maximum pipe length S4 of the non-bulging part between the bolt body (sleeved on the non-bulging part) and the bulging part (S2" ≤ S4). The pipe length of the bolt pipe clamp is determined by the distance from the limiting part to the second end of the bolt body. Therefore, in the ninth embodiment, the pipe length of the bolt pipe clamp 930 adapted to the bolt body 920 is also correspondingly shortened to S1", and S1" = S2". Therefore, S1" ≤ S4, as shown in Figure 21 (2) and (3) below, where Figure 21 (2) is a diagram showing the limiting part moving towards the second end of the bolt body. Figure 21Figure (3) shows the illustration of the limiting part extending towards the second end of the bolt body. In this way, the bolt pipe clamp 930 or its pipe wall can be arranged (sleeved on the non-bulging part) between the bolt body 920 and the bulging part 912 along the direction of the connecting pipe. The bolt pipe clamp 930 or its pipe wall can be inserted into the bolt body 820 (or the bolt through-hole) from the second end of the bolt body along the connecting pipe. Similar to the first embodiment, the first end of the bolt pipe clamp 930 is located on the limiting part 924, and the limiting part 924 limits and supports the bolt pipe clamp 930. The second end is flush with the second end of the bolt body 920 (i.e., the second end of the bolt rod) and serves as the first clamping part to clamp and push the bulging part of the externally inserted pipe.

[0365] In the ninth embodiment, the closer the position where the limiting part 924 moves or extends is to the second end of the bolt body (or the second end of the bolt rod), the smaller the distance S2” from the limiting part to the second end of the bolt body. The corresponding bolt pipe clamp 930 and its pipe length S1” are also shorter, and it is easier for the bolt pipe clamp 930 to be assembled with the bolt body on the non-bulging part 913 to form a fastening bolt.

[0366] It should be noted that in the ninth embodiment, the limiting part 924 cannot move or extend to the second end of the bolt body (or the second end of the bolt rod). The reason is as follows: When the limiting part 924 moves or extends to the second end of the bolt body (or the second end of the bolt rod), the distance S2” from the limiting part to the second end of the bolt body is zero. At this time, there is no place to arrange the bolt pipe clamp 930. In the present invention, the aperture of the central hole > the maximum outer diameter R of the bulging part. The limiting part 924 can pass through the bulging part 112, and it does not have the ability to clamp and push the bulging part 112 itself, so it cannot effectively fix and seal the connection between the connecting pipe and the external pipe. Therefore, the limiting part cannot move or extend to the second end of the bolt rod, and a space needs to be reserved between the limiting part and the second end of the bolt body to arrange the bolt pipe clamp.

[0367] In the ninth embodiment, a bolt clip tube is provided for each fastening bolt, and the tube length of the bolt clip tube is determined by the distance from the limiting portion to the second end of the bolt body. By shortening the distance from the limiting portion to the second end of the bolt body to be less than the maximum tube length S4 of the non-bulging portion between the bolt body (sleeved on the non-bulging portion) and the bulging portion, the shortening of the tube length of the bolt clip tube is achieved, and the tube length S1" of the bolt clip tube after shortening is ≤ the maximum tube length S4 of the non-bulging portion between the bolt body (sleeved on the non-bulging portion) and the bulging portion. In this way, the assembly property of the bolt clip tube and the bolt body is ensured, and the fastening bolt is assembled on the non-bulging portion, solving the assembly problem between the bolt clip tube and the bolt body. In the ninth embodiment, the tube length of the bolt clip tube is shortened by shortening the distance from the limiting portion to the second end of the bolt body, improving the assemblability and application range of the tube connection device. For the material and structure of the connection body, fastening nut, and external tube in this embodiment, reference can be made to the first embodiment, which will not be elaborated here.

[0368] Embodiment Ten

[0369] For the above-mentioned first embodiment, its bolt clip tube 130 is a tube structure formed by splicing two clip tube walls 131 and 132 with different arc sizes.

[0370] The main difference from the first embodiment is that in the tenth embodiment, the bolt clip tube is formed by splicing tube structures with tube seams, and the tube seams are arranged along the direction of the bolt clip tube.

[0371] In the present invention, the bulging portion of the connecting tube is pressed into the external tube to connect the connecting tube and the external tube to form a fluid passage; on both sides of the bulging portion pressed into the external tube, a fastening bolt and a fastening nut are respectively arranged. The fastening bolt and the fastening nut are screwed tightly to clamp and push the bulging portion pressed into the external tube, thereby fixing the connection between the connecting tube and the external tube and forming a seal; the fastening nut is arranged on the second side of the bulging portion and is sleeved on the external tube; the fastening bolt is arranged on the first side of the bulging portion and is sleeved on the connecting tube. Specifically, it is sleeved on the non-bulging portion. This requires that for the fastening bolt: its aperture should be greater than or equal to the maximum outer diameter R of the bulging portion, so that the fastening bolt can pass through the second end of the connecting tube, pass through the bulging portion, and be sleeved on the non-bulging portion, and at the same time, it should be less than the maximum outer diameter R of the bulging portion, so that the fastening bolt sleeved on the non-bulging portion cannot pass through the bulging portion and can clamp and push the bulging portion.

[0372] The above two requirements for the aperture of the fastening bolt are contradictory, but they are also the basic conditions that the fastening bolt in the present invention must possess. In order to meet the above two requirements simultaneously and place the fastening bolt on the first side of the bulging portion, the present invention splits the fastening bolt into a bolt body and a bolt clamping tube. The bolt body and the bolt clamping tube respectively implement part of the requirements and functions of the fastening bolt. In particular, the contradictory requirements and functions of the fastening bolt are executed and realized by different components. Specifically, a bolt through-hole is opened inside the bolt body, and the aperture of the bolt through-hole is greater than or equal to the maximum outer diameter R of the bulging portion. In this way, the bolt body can pass through the second end of the connecting tube, pass through the bulging portion, and be sleeved on the non-bulging portion. A threaded structure is provided on the outer wall of the bolt body to cooperate with the fastening nut for bolt tightening. At the same time, the bolt body is used to carry the bolt clamping tube and perform functions such as clamping and supporting the bolt clamping tube; the bolt clamping tube is arranged in the bolt through-hole or the bolt body. The aperture of the bolt clamping tube is smaller than the maximum outer diameter R of the bulging portion, and it is a tube structure formed by surrounding and fitting or joining the non-bulging portion. In this way, the bolt clamping tube can directly be sleeved on the first bulging portion to clamp and push the bulging portion of the externally pressed tube without passing through the bulging portion.

[0373] In order to enable the bolt clamping tube with an aperture smaller than the maximum outer diameter R of the bulging portion to be arranged on the first side of the bulging portion and sleeved on the non-bulging portion, in the first embodiment, two clamping tube walls 131 and 132 with different arc sizes surround the non-bulging portion 113 or the external tube 150 on its outer layer and are joined to form the bolt clamping tube 130. The bolt clamping tube 130 is directly sleeved on the non-bulging portion 113 or the external tube 150 on its outer layer and is located on the first side of the bulging portion, without the need to pass through the bulging portion 112 to be arranged on the first side of the bulging portion.

[0374] In the tenth embodiment of the present invention, the bolt clamping tube 1030 itself is a tube structure with a tube slit. The tube slit 1034 is arranged along the direction of the bolt clamping tube, with one end extending towards the first end of the bolt clamping tube 1030 and the other end extending towards the second end of the bolt clamping tube 1030, as Figure 22 shown; in this way, by expanding the tube slit 1034, the bolt clamping tube 1030 can be directly sleeved on the non-bulging portion or the external tube on its outer layer, and the bolt clamping tube 1030 can be placed on the first side of the bulging portion without the need to pass through the bulging portion to be arranged on the first side of the bulging portion.

[0375] In the present embodiment 10, when assembling the bolt body and the bolt clamping tube on the non-bulging part to form a fastening bolt, the bolt body is first inserted from the second end of the connecting tube, through the bulging part, and onto the non-bulging part. Then, at the non-bulging part between the bolt body and the bulging part, the tube gap 1034 is opened, the bolt clamping tube 1030 is inserted onto the external tube of the non-bulging part or its outer layer, and the bolt clamping tube 1030 is installed into the bolt through hole (or the bolt body) along the connecting tube (or the non-bulging part). The bolt body clamps the bolt clamping tube 1030 through its inner wall, so that the tube gap 1034 is tightly spliced ​​to form a complete tube structure. The bolt clamping tube 1030 maintains the tube structure state, and its tube structure is stable and fixed, and forms a fastening bolt with the bolt body. When disassembling the fastening bolt, push the bolt clamp tube 1030 out of the bolt through hole (or the bolt body), open the tube slit 1034, remove the bolt clamp tube 1030 from the non-bulging part or the outer tube of the outer layer, and remove the bolt body from the second end of the connecting tube through the bulging part. The materials and structures of the connecting body, the fastening nut, the outer tube and the bolt body of this embodiment can be referred to in the first embodiment, and will not be described in detail here.

[0376] Embodiment 11

[0377] In the first embodiment, the bolt tube clamp 130 is formed by splicing two tube clamping walls 131 and 132 with different arc sizes. The arc of the tube clamping wall 132 is larger than the arc of the tube clamping wall 131. The tube clamping walls 131 and 132 can be spliced ​​together to form a complete tube structure (i.e., the bolt tube clamp 130).

[0378] The main difference from the first embodiment is that the bolt tube clamp 1130 in the eleventh embodiment is formed by splicing two tube clamping walls 1131 and 1132 of the same arc size, the arc of the tube clamping wall 1131 is equal to the arc of the tube clamping wall 132, and the tube clamping walls 1131 and 1132 are spliced ​​together to form a complete tube structure (i.e., the bolt tube clamp 1130). Figure 23 shown.

[0379] In the present invention, the hole diameter of the bolt clamp is smaller than the maximum outer diameter R of the bulging part, and the bolt clamp cannot pass through the bulging part from the second end of the connecting tube and onto the non-bulging part. The present invention adopts a method of splicing or embedding the clamp walls, so that each clamp wall surrounds the non-bulging part or the outer tube of its outer layer, splices or embeds to form a bolt clamp. In this way, the bolt clamp does not need to pass through the bulging part, but can be directly inserted into the non-bulging part or the outer tube of its outer layer, so as to clamp and push the bulging part pressed into the outer tube.

[0380] In the first embodiment, the external tube surrounding the non-bulging part or its outer layer, and the two clip tube walls 131 and 132 that are joined together to form the bolt clip tube have different arc sizes. The arc of clip tube wall 131 is smaller than that of clip tube wall 132. This means that at least two different specifications of clip tube walls need to be prepared when manufacturing the device.

[0381] In the eleventh embodiment of the present invention, the external tube surrounding the non-bulging part or its outer layer, and the two clip tube walls 1131 and 1132 that are joined together to form the bolt clip tube have the same arc size. Both clip tube walls 1131 and 1132 are semi-circular tube walls, and clip tube wall 1131 and clip tube wall 1132 are two completely identical tube walls. This means that only one specification of clip tube wall needs to be prepared when manufacturing the device, which will greatly save the production process and production cost in actual manufacturing. Moreover, the openings of each clip tube wall are all semi-circular arcs and can just directly fit the external tube of the non-bulging part or its outer layer for joining, without any clip tube wall needing to be opened and stretched to be sleeved on the external tube of the non-bulging part or its outer layer for joining (if the two clip tube walls are of different sizes, there must be a clip tube wall with a major arc and a corresponding central angle greater than 180°. Such a clip tube wall has a smaller opening, and when forming the bolt clip tube by joining, it needs to be opened and stretched and sleeved on the external tube of the non-bulging part or its outer layer). The clip tube wall provided in this embodiment is very cost-effective and has important significance in actual production and application. For the material and structure of the connection body, fastening nut, external tube, and bolt body in this embodiment, reference can be made to the first embodiment, which will not be elaborated here.

[0382] Embodiment Twelve

[0383] In the first embodiment, the bolt clip tube 130 is formed by joining two clip tube walls 131 and 132 with different arc sizes. The clip tube walls 131 and 132 joined together can just form a complete tube structure (i.e., the bolt clip tube 130).

[0384] The main difference from the first embodiment is that in this twelfth embodiment, the bolt clip tube 1230 is formed by joining at least three clip tube walls, and the arc sizes of each clip tube wall are not completely the same. The clip tube walls joined together can just form a complete tube structure (i.e., the bolt clip tube 1230).

[0385] In this embodiment, the bolt clip tube 1230 is formed by joining three clip tube walls with different arc sizes. For example, the arcs of each clip tube wall can be 2 / 3 arc (corresponding central angle of 240°), 1 / 6 arc (corresponding central angle of 60°), and 1 / 6 arc (corresponding central angle of 60°) respectively, or can be 1 / 2 arc (corresponding central angle of 180°), 1 / 3 arc (corresponding central angle of 120°), and 1 / 6 arc (corresponding central angle of 60°) respectively, as Figure 24 shown.

[0386] In this embodiment, the bolt clamping tube 1230 can also be formed by splicing four clamping tube walls with different arc sizes. For example, the arcs of the clamping tube walls can be 1 / 3 arc (corresponding central angle is 120°), 1 / 6 arc (corresponding central angle is 60°), and two 1 / 4 arcs (corresponding central angle is 90°) respectively.

[0387] The number and arc size of the clamping tube walls forming the bolt clamping tube 1230 are not limited in this embodiment, nor are they limited in other related examples, and can be designed according to actual application situations; however, it should be noted that the clamping tube walls can just form a complete tube structure (i.e., the bolt clamping tube 1230) when spliced together. For the materials and structures of the connection body, fastening nut, external tube, and bolt body in this embodiment, reference can be made to Embodiment 1, which will not be elaborated here.

[0388] According to the above deformation method, further expansion can be made as follows:

[0389] In this expanded embodiment, the bolt clamping tube is formed by splicing at least three clamping tube walls, and the arc sizes of the clamping tube walls are exactly the same. The clamping tube walls can just form a complete tube structure (i.e., the bolt clamping tube) when spliced together.

[0390] In this expanded embodiment, the bolt clamping tube can be formed by splicing three clamping tube walls with 1 / 3 arcs, or by splicing four clamping tube walls with 1 / 4 arcs. The number of the clamping tube walls forming the bolt clamping tube is not limited in this expanded embodiment, nor is it limited in other related examples, and can be designed according to actual application situations. The beneficial effects of this expanded embodiment can refer to the corresponding content in Embodiment 11 above, which will not be elaborated here.

[0391] Embodiment 13

[0392] In Embodiment 1, the bolt clamping tube 130 is formed by splicing two clamping tube walls 131 and 132. At each adjacent joint, the fitting surfaces of the clamping tube wall 131 and the clamping tube wall 132 are closely fitted, thus forming a complete tube structure (i.e., the bolt clamping tube 130).

[0393] The main difference from Embodiment 1 is that: in this Embodiment 13, the bolt clamping tube has a first positioning structure for positioning two adjacent clamping tube walls and aligning the two ends of the two adjacent clamping tube walls; the first positioning structure includes a positioning pin arranged on the side surface of one adjacent clamping tube wall and a positioning groove arranged on the side surface of the other adjacent clamping tube wall.

[0394] In the first embodiment, the bolt pipe clamp 130 formed by the splicing of the clamp pipe walls 131 and 132 has two adjacent joints. One of the adjacent joint sides 131a and 132a are closely spliced, and the other adjacent joint sides 131b and 132b are closely spliced. In the first embodiment, when the two clamp pipe walls 131 and 132 are spliced around the non-bulging part or the outer pipe of it or during the process of splicing and then inserting into the bolt through-hole, it is easy to have the situation that the adjacent clamp pipe walls slide relative to each other and the two ends are not aligned, as shown in Figure 25 Figure (1) in; if the port of the formed bolt pipe clamp is not neat, then the clamping and pressing functions of the first clamping part (i.e., the second end of the bolt pipe clamp) on the bulging part of the inserted outer pipe will be greatly affected. The acting forces on the bulging part and its outer pipe in the circumferential direction are unbalanced, and the connection and sealing effects between the connecting pipe and the outer pipe will both be affected; for the bolt pipe clamp composed of multiple clamp pipe walls, the above situation will be more prominent and obvious during use and cannot be ignored.

[0395] In the thirteenth embodiment, the bolt pipe clamp 1330 is formed by the splicing of two clamp pipe walls 1331 and 1332. Among them, the clamp pipe wall 1331 has sides 1331a and 1331b, and the clamp pipe wall 1332 has sides 1332a and 1332b. In order to prevent the adjacent clamp pipe walls from sliding relative to each other and the two ends from being misaligned during splicing and ensure that the port of the formed bolt pipe clamp is neat, in this embodiment, a positioning groove is opened at the middle position of the side 1331a of the clamp pipe wall 1331 as the first positioning structure, and a positioning pin is arranged at the middle position of the side 1332a of the clamp pipe wall 1332 as the corresponding first positioning structure to cooperate with it. Positioning pins are respectively arranged at both ends of the side 1331b of the clamp pipe wall 1331 as the first positioning structure, and positioning grooves are respectively arranged at both ends of the side 1332b of the clamp pipe wall 1332 as the corresponding first positioning structure to cooperate with it, as shown in Figure 25 Figure (2) in.

[0396] When the clamp pipe walls 1331 and 1332 are spliced, at one adjacent joint of the nut pipe clamp 1330, the positioning pin at the middle position of the side 1332a is inserted into the positioning groove at the corresponding position of the side 1331a. At the other adjacent joint of the nut pipe clamp 1330, the positioning pins at both ends of the side 1331b are respectively inserted into the positioning grooves at the corresponding positions of the side 1332b. When the adjacent clamp pipe walls 1331 and 1332 are spliced together, the two ends are aligned and will not slide relative to each other. The port of the spliced bolt pipe clamp is neat, ensuring the connection and sealing effects between the connecting pipe and the outer pipe. For the material and structure of the connection body, fastening nut, outer pipe, and bolt body in this embodiment, reference can be made to the first embodiment, which will not be elaborated here.

[0397] In this embodiment, three or even more first positioning structures can be provided on the side surface of the clamp wall. The first positioning structures can be provided at any position on the side surface (not limited to the middle position and both ends). The shape of the positioning groove or the positioning pin can be designed as circular, triangular or other shapes. In this embodiment, the number, position and shape of the first positioning structures on the side surface of the clamp wall are not limited, nor are they limited in other related examples, and can be designed according to the actual application situation. It should be noted that at the adjacent part of the bolt clamp pipe, the position, number and shape of the positioning pins on the side surface of one adjacent clamp wall should match the position, number and shape of the positioning grooves on the side surface of the other adjacent clamp wall.

[0398] In this embodiment, the adjacent clamp walls are positioned by providing the first positioning structures on the side surface of the clamp wall, which improves the splicing efficiency of the bolt clamp wall and ensures the splicing quality, and has good application effects.

[0399] Embodiment Fourteen

[0400] In Embodiment One, the inner wall of the first clamping part 133 is a cylindrical curved surface. The first clamping part 133 clamps and presses the bulging part of the external pipe by clamping the first bearing surface of the bulging part with its inner edge 133o.

[0401] The main difference from Embodiment One is that in this Embodiment Fourteen, the inner wall of the first clamping part is designed with a conical curved surface, and this conical curved surface can fit with the first bearing surface of the bulging part. The first clamping part clamps and presses the bulging part of the external pipe by clamping the first bearing surface of the bulging part with its conical curved surface.

[0402] In Embodiment One, the first clamping part 133 is the second end of the bolt clamp pipe. The inner wall 133i of the first clamping part 133 is a tubular curved surface or a cylindrical curved surface, as shown in (1) in Figure 26 and the inner diameter of the bolt clamp pipe 130 < the second composite outer diameter R2 (which means the inner diameter of the first clamping part 133 < the second composite outer diameter R2). Therefore, when the fastening bolt and the fastening nut are screwed tightly, only the inner edge 133o of the inner wall of the first clamping part 133 will clamp on the first bearing surface 112a of the bulging part to clamp and press the bulging part of the external pipe. That is to say, for the external pipe outside the bulging part, the force-bearing position is only the part pushed by the inner edge 133o (this part is only a circle). The force-bearing area of the external pipe at the first clamping part in Embodiment One is very limited.

[0403] In this embodiment, the first clamping part 1433 is still the second end of the bolt clamp pipe, but the inner wall 1433i of the first clamping part 1433 is designed with a conical curved surface, and this conical curved surface can fit with the first bearing surface of the bulging part, as shown in Figure 26As shown in (2), the inner diameter of the bolt clamp tube 1430 < the second composite outer diameter R2 (which means the inner diameter of the first clamping portion 1433 and its tapered surface < the second composite outer diameter R2). This makes it so that when the fastening bolt and the fastening nut are screwed tightly, the tapered surface of the first clamping portion 1433 will be stuck on the first pressure-bearing surface of the bulging portion to clamp and push and press the bulging portion of the external tube into it. This also means that for the external tube outside the bulging portion, the force-bearing position is the portion pushed by the tapered surface (this portion is a tapered surface). In this embodiment, the force-bearing area of the external tube at the first clamping portion is greatly expanded.

[0404] Under the same clamping and pushing force of the first clamping portion, in the first embodiment, the force-bearing area of the external tube at the first clamping portion is limited, so the pressure on the force-bearing portion is large, and the difference from its non-force-bearing portion is large. The force-bearing portion of the external tube is prone to deformation, damage, aging, and other conditions. In this embodiment, the force-bearing area of the external tube at the first clamping portion is large, so the pressure on the force-bearing portion is small, and the difference from its non-force-bearing portion is small. Thus, the above-mentioned deformation, damage, aging, and other conditions are not likely to occur. In this embodiment, a tapered surface that can fit with the first pressure-bearing surface of the bulging portion is designed on the inner wall of the first clamping portion, so that the external tube at the first clamping portion is protected, effectively improving the situation of excessive local stress of the pipe fittings and damaging the pipe fittings, which is of great benefit to improving the connection and sealing effect of the connecting pipe and the external tube.

[0405] Based on the above, the present invention also provides a deformation example, which is specifically as follows:

[0406] The main difference from the first embodiment is that: in this deformed embodiment, the inner wall of the second clamping portion is designed with a tapered surface, and this tapered surface can fit with the second pressure-bearing surface of the bulging portion. The second clamping portion is stuck at the second pressure-bearing surface of the bulging portion through its tapered surface to clamp and push and press the bulging portion of the external tube into it.

[0407] Similar to the setting of the above first clamping portion 133, in the first embodiment, the second clamping portion 141 is a circular ring structure, and its inner wall 141i is a tubular surface or a cylindrical surface, as Figure 27 shown in (1), and the inner diameter of the second clamping portion 141 < the second composite outer diameter R2. Therefore, when the fastening bolt and the fastening nut 140 are screwed tightly, only the inner edge 141o of the inner wall of the second clamping portion 141 will be stuck on the second pressure-bearing surface of the bulging portion to clamp and push and press the bulging portion of the external tube into it. This also means that for the external tube outside the bulging portion, the force-bearing position is only the portion pushed by the inner edge 141o (this portion is only a circle). In the first embodiment, the force-bearing area of the external tube at the second clamping portion is very limited.

[0408] In this modified embodiment, the second clamping portion 1441 is still a circular ring structure, but the inner wall of the second clamping portion 1441 is designed with a conical surface, and this conical surface can fit with the second bearing surface of the bulging portion. As shown in Figure 27 Figure (2), and the inner diameter of the second clamping portion 1441 < the second composite outer diameter R2 (which means that the inner diameter of this conical surface < the second composite outer diameter R2). This makes it that when the fastening bolt and the fastening nut are screwed tightly, the conical surface of the second clamping portion 1441 will be stuck on the second bearing surface of the bulging portion to clamp and push the bulging portion of the externally inserted tube. That is to say, for the externally inserted tube outside the bulging portion, the force-bearing position is the portion pushed by the conical surface (this portion is a conical surface). In this modified embodiment, the force-bearing area of the externally inserted tube at the second clamping portion is greatly expanded.

[0409] Under the condition that the clamping and pushing forces of the second clamping portion are the same, in the first embodiment, the force-bearing area of the externally inserted tube at the second clamping portion is limited, so the pressure on the force-bearing portion is large, and the difference from its non-force-bearing portion is large. The force-bearing portion of the externally inserted tube is prone to deformation, damage, aging and other conditions. While in this embodiment, the force-bearing area of the externally inserted tube at the second clamping portion is large, so the pressure on the force-bearing portion is small, and the difference from its non-force-bearing portion is small, and thus it is not easy to appear the above-mentioned deformation, damage, aging and other conditions. In this embodiment, a conical surface that can fit with the second bearing surface of the bulging portion is designed on the inner wall of the second clamping portion, so that the externally inserted tube at the second clamping portion is protected, effectively improving the situation of excessive local stress of the pipe fittings and damaging the pipe fittings, which is of great benefit to improving the connection and sealing effect of the connecting pipe and the externally inserted tube.

[0410] According to the above-mentioned deformation method, further expansion can be made as follows:

[0411] The main difference from the first embodiment is that: in this expanded embodiment, conical surfaces are designed on the inner walls of both the first clamping portion and the second clamping portion, and these conical surfaces can fit with the corresponding bearing surfaces of the bulging portions respectively. In this way, when the fastening bolt and the fastening nut are screwed tightly, on the first side of the bulging portion, the conical surface of the first clamping portion will be stuck at the first bearing surface of the bulging portion to clamp and push the bulging portion of the externally inserted tube; on the second side of the bulging portion, the conical surface of the second clamping portion will be stuck at the second bearing surface of the bulging portion to clamp and push the bulging portion of the externally inserted tube; the inner diameters of both the first clamping portion and the second clamping portion are smaller than the second composite outer diameter R2, and neither the first clamping portion nor the second clamping portion can allow the bulging portion 112 to pass through. The bulging portion 112 is clamped and fixed between the first clamping portion and the second clamping portion.

[0412] For the relevant explanations of the conical curved surface clamping of the first clamping part and the second clamping part and the pushing and pressing of the bulging part, reference can be made to the above two embodiments, and they will not be repeated in this extended embodiment. In this extended embodiment, conical curved surfaces that can fit the bearing surfaces of the respective bulging parts are designed on the inner walls of the first clamping part and the second clamping part, which can simultaneously protect the outer pipe parts at these two positions of the first clamping part and the second clamping part, extend the service life of the pipe fittings, improve the sealing stability at these two positions of the first clamping part and the second clamping part, ensure the balance of the clamping and pushing forces on both sides of the bulging part, and are of great significance to the safety and stability of the connection between the connecting pipe and the outer pipe.

[0413] Embodiment Fifteen

[0414] For the above-mentioned Embodiment 1, the inner diameter of the bolt pipe clamp 130 < the second composite outer diameter R2. Therefore, the second end of the bolt pipe clamp 130 can be used as the first clamping part 133 to clamp and push and press the bulging part of the outer pipe into the outer pipe.

[0415] The main difference from Embodiment 1 is that in this Embodiment Fifteen, the first clamping part is an annular structure arranged inside the bolt pipe clamp. This annular structure is arranged along the circumferential direction on the inner wall of the second end of the bolt pipe clamp, and the inner diameter of this annular structure < the second composite outer diameter R2. Therefore, this annular structure can be used as the first clamping part to clamp and push and press the bulging part of the outer pipe into the outer pipe.

[0416] In Embodiment 1, the inner diameter of the bolt pipe clamp 130 < the second composite outer diameter R2 (the second composite outer diameter R2 = the maximum outer diameter R of the bulging part + the wall thickness d of the outer pipe). Therefore, the bolt pipe clamp 130 sleeved on the non-bulging part cannot pass through the bulging part covered with the outer pipe (i.e., the bulging part pressed into the outer pipe), and its second end close to the bulging part, specifically the inner edge of the second end, will be stuck at the first bearing surface of the bulging part. When the fastening bolt and the fastening nut are screwed tightly, the second end of the bolt pipe clamp can directly be used as the first clamping part to clamp and push and press the bulging part of the outer pipe into the outer pipe, without the need to additionally set a structure on the bolt pipe clamp as the first clamping part to realize the function of clamping and pushing the bulging part; the inner diameter of the first clamping part 133 = the inner diameter of the bolt pipe clamp 130.

[0417] In Embodiment 1, the second end of the bolt pipe clamp is used to clamp and push and press the bulging part of the outer pipe into the outer pipe. Therefore, there are requirements and limitations on the inner diameter of the bolt pipe clamp, and it is required that the inner diameter of the bolt pipe clamp < the second composite outer diameter R2. If the inner diameter of the bolt pipe clamp ≥ the second composite outer diameter R2, such a bolt pipe clamp can pass through the bulging part covered with the outer pipe (i.e., the bulging part pressed into the outer pipe), and its second end cannot be used as the first clamping part to clamp and push the bulging part of the outer pipe into the outer pipe.

[0418] In order to solve the above problem, even if the inner diameter of the bolt clamp tube is greater than or equal to the second composite outer diameter R2, the bolt clamp tube can still clamp and push the bulging portion of the outer tube. In this embodiment, a circular ring structure is provided in the bolt clamp tube as the first clamping portion 1533, such as Figure 28 shown.

[0419] In this embodiment, the annular structure is arranged on the inner wall of the second end of the bolt clamp tube along the circumferential direction, so the inner diameter of the first clamping portion 1533 is smaller than the inner diameter of the bolt clamp tube 1530; at the same time, the inner diameter of the annular structure is smaller than the second composite outer diameter R2, so the annular structure can serve as the first clamping portion 1533. When the fastening bolt and the fastening nut are screwed tight, the bolt clamp tube sleeved on the non-bulging portion and the first clamping portion 1533 inside thereof cannot pass through the bulging portion coated with the outer layer of the external tube (i.e., the bulging portion pressed into the external tube). The first clamping portion 1533 will be stuck at the first pressure-bearing surface of the bulging portion to clamp and push the bulging portion pressed into the external tube. Figure 28 shown.

[0420] In this embodiment, for the bolt clamp formed by splicing the clamp walls, the inner wall of the second end of each clamp wall is provided with its corresponding first clamping portion, and the clamp wall and its corresponding first clamping portion can be prepared as one piece; while each tube wall surrounds the non-bulging portion or the outer tube of its outer layer and is spliced ​​to form a bolt clamp, a complete first clamping portion is also formed inside the bolt clamp, and the first clamping portion is arranged around the non-bulging portion or the outer tube of its outer layer.

[0421] It should be noted that, in the present invention, the inner diameter of the first clamping portion 1533 should also be greater than or equal to the first composite outer diameter R1, that is, the inner diameter of the first clamping portion ≥ the first composite outer diameter R1 (the first composite outer diameter R1 = the outer diameter of the non-bulging portion r + the thickness of the outer tube wall d). In this way, each clamping tube wall can surround the non-bulging portion or the outer layer of the external tube, and be spliced ​​or embedded to form a complete tube structure with adjacent clamping tube wall sides tightly fitting together, and uniformly clamp and push the bulging portion of the external tube in the circumferential direction.

[0422] In this embodiment, a circular ring structure is provided on the inner wall of the second end of the bolt clamp tube as the first clamping portion, so that even if the inner diameter of the bolt clamp tube is greater than or equal to the second composite outer diameter R2, the bolt clamp tube can still clamp and push into the bulging portion of the external tube, thereby improving the adaptability of the bolt clamp tube.

[0423] Embodiment 16

[0424] For the above-mentioned embodiment 1, the outer diameter of the bolt clamp tube 130 is equal to the hole diameter of the bolt through hole 123; therefore, the bolt body 120 can tighten the assembled bolt clamp tube 130 through its inner wall (or the bolt through hole 123 can tighten the assembled bolt clamp tube 130 through its hole wall), so that the bolt clamp tube maintains a tube structure state.

[0425] The main difference from Example 1 is that in this Example 16, the outer diameter of the bolt clamp tube is less than the hole diameter of the bolt through hole, and a tightening structure is provided on the outer wall of the bolt clamp tube, and the outer diameter of the tightening structure is equal to the hole diameter of the bolt through hole; therefore, the bolt body can still tighten the tightening structure through its inner wall (or the bolt through hole can tighten the tightening structure through its hole wall), so that the bolt clamp tube maintains a tube structure state.

[0426] In the first embodiment, the outer diameter of the bolt clamp tube 130 is equal to the hole diameter of the bolt through hole 123. Therefore, the bolt clamp tube 130 or its clamp tube walls 131 and 132 can be inserted into the bolt through hole 123, and its outer wall is tightly fitted with the inner wall of the bolt body 120 (i.e., the hole wall of the bolt through hole). Therefore, when the bolt clamp tube 130 is placed in the bolt through hole 123, the bolt body 120 can clamp the bolt clamp tube 130 formed by the combination through its inner wall (or the bolt through hole 123 can clamp the bolt through its hole wall), so that the bolt clamp tube formed by the combination maintains the tube structure state, and its tube structure is stable and fixed without loosening. The first embodiment tightens the bolt clamp tube by the bolt body, so it has requirements and restrictions on the outer diameter of the bolt clamp tube, and the outer diameter of the bolt clamp tube needs to be equal to the hole diameter of the bolt through hole.

[0427] If the outer diameter of the bolt clamp tube is smaller than the bolt through hole diameter, the bolt clamp tube or its clamp tube wall can be inserted into the bolt through hole, but does not fit with the inner wall of the bolt body (i.e., the hole wall of the bolt through hole), and the bolt body cannot effectively clamp the bolt clamp tube formed by the assembly. In this way, the adjacent clamp tube walls do not fit together, and a gap is formed between the tube walls, resulting in uneven clamping and pushing pressure on the bulging part in the circumferential direction. When the outer diameter of the bolt clamp tube is smaller than the bolt through hole diameter, the above phenomenon will be more obvious, and its clamp tube wall may even become loose and shake in the bolt through hole, and a bolt clamp tube with a stable tube structure cannot be formed.

[0428] In order to solve the above problem, a bolt clamp tube with an outer diameter smaller than the bolt through hole diameter can be installed in the bolt through hole to maintain the tube structure state and the structure is stable and fixed. In this embodiment, a clamp structure 1634 is provided on the outer wall of the bolt clamp tube. Figure 29 shown.

[0429] In this embodiment, the clamp structure 1634 is a complete annular structure, which is arranged on the outer wall of the bolt clamp tube. The outer diameter of the clamp structure 1634 is greater than the outer diameter of the bolt clamp tube. The clamp structure 1634 is arranged at the middle position of the bolt clamp tube. Figure 29 In this embodiment, the outer diameter of the clamp structure 1634 is equal to the diameter of the bolt through hole. Therefore, the bolt clamp tube 1630 or its clamp tube wall can be inserted into the bolt through hole, and the outer wall of the clamp structure 1634 is tightly fitted with the inner wall of the bolt body (i.e., the hole wall of the bolt through hole). Figure 30As shown. When the bolt clamping tube 1630 is placed in the bolt through-hole, the bolt body 1620 can clamp the tightening structure 1634 through its inner wall (or the bolt through-hole can clamp through its hole wall), so as to realize the tightening of the bolt clamping tube 1630 formed by splicing, so that the bolt clamping tube formed by splicing maintains the tube structure state, and the tube structure is stably shaped without loosening.

[0430] In addition, in the first embodiment, the outer diameter of the bolt clamping tube 130 = the aperture of the bolt through-hole 123. Although the bolt body can effectively clamp the bolt clamping tube formed by splicing, the entire outer wall of the bolt clamping tube 130 (or the clamping tube walls 131, 132) is in close contact with the inner wall of the bolt body 120 (i.e., the hole wall of the bolt through-hole). In this way, the contact area between the bolt clamping tube and the bolt body is large, and the formed frictional force is also large. Pushing the bolt clamping tube or its clamping tube wall into or out of the bolt through-hole will be subject to a large frictional resistance and is very laborious. If there are large dimensional errors in the components or the assembly space is narrow, the operation of pushing the bolt clamping tube or its clamping tube wall into or out of the bolt through-hole will be very difficult.

[0431] In this embodiment, the outer diameter of the bolt clamping tube < the aperture of the bolt through-hole, and the outer diameter of the tightening structure 1634 = the aperture of the bolt through-hole, so that the bolt body can still effectively clamp the bolt clamping tube formed by splicing, and only the outer wall of the tightening structure 1634 is in close contact with the inner wall of the bolt body 120 (i.e., the hole wall of the bolt through-hole). In this way, the contact area between the bolt clamping tube and the bolt body is greatly reduced, and the formed frictional force is naturally reduced. The frictional resistance received when pushing the bolt clamping tube or its clamping tube wall into or out of the bolt through-hole is small, so it is relatively easy and labor-saving to push the bolt clamping tube or its clamping tube wall into or out of the bolt through-hole.

[0432] In this embodiment, the bolt clamping tube 1630 is a tube structure formed by splicing two clamping tube walls. The outer walls of each clamping tube wall are provided with its corresponding tightening structure parts, and each clamping tube wall and its corresponding tightening structure part can be integrally formed. In this way, when the tube walls of the bolt clamping tube are spliced together to form a complete bolt clamping tube, a complete tightening structure 1634 is also spliced on the outer wall of the bolt clamping tube.

[0433] Compared with the first embodiment, in this embodiment, by providing a tightening structure on the outer wall of the bolt clamping tube and setting the outer diameter of the tightening structure = the aperture of the bolt through-hole, the bolt clamping tube with an outer diameter smaller than the aperture of the bolt through-hole can also maintain the spliced state and be stably shaped in the bolt through-hole. At the same time, it also makes the operation of pushing the bolt clamping tube into or out of the bolt through-hole more labor-saving and easy, which has important significance in practical applications.

[0434] Based on the above, the present invention also provides another deformation example, specifically as follows:

[0435] The main difference from the above-mentioned sixteenth embodiment is that in this modified embodiment, the tightening structure 1634 is arranged at the second end of the bolt clamping tube.

[0436] As Figure 29 shown in (2) therein, the tightening structure 1634 is arranged on the outer wall of the second end of the bolt clamping tube. In this way, only when the bolt clamping tube is almost completely pushed into the bolt through-hole or just starts to be pushed out of the bolt through-hole, the tightening structure 1634 moves inside the bolt through-hole and will fit with the inner wall of the bolt body to form frictional resistance; during other processes of pushing or pulling out the bolt clamping tube from the bolt through-hole, the tightening structure 1634 moves outside the bolt through-hole and does not fit or contact with the inner wall of the bolt body, so no frictional resistance will be formed, which makes it more labor-saving and easier to push or pull the bolt clamping tube or its clamping tube into or out of the bolt through-hole.

[0437] It should be noted that in the present invention, the tightening structure 1634 can be arranged at any position on the outer wall of the bolt clamping tube. Even on different clamping tube walls, the parts of the tightening structure arranged on their outer walls can be at different positions, as Figure 29 shown in (3) therein. The present invention does not limit the setting position of the tightening structure, nor does it limit in other related embodiments. In actual applications, it can be designed according to needs, as long as the outer diameter of the tightening structure = the aperture of the bolt through-hole, so that the bolt clamping tube can be placed in the bolt through-hole and can be effectively tightened by the bolt body, maintaining the assembled state and stable shaping.

[0438] Based on the above, the present invention also provides another modified example, which is specifically as follows:

[0439] The main difference from the above-mentioned sixteenth embodiment is that in this modified embodiment, the tightening structure 1634 is an incomplete ring structure and is composed of several discontinuous ring segments, as Figure 29 shown in (4) therein. When the bolt clamping tube is placed in the bolt through-hole, the outer walls of all the ring segments are closely attached to the inner wall of the bolt body 120 (i.e., the wall of the bolt through-hole), so that the bolt body 1620 can tighten the tightening structure 1634 through its inner wall (or the bolt through-hole can tighten the tightening structure 1634 through its wall), thereby tightening the assembled bolt clamping tube 1630, so that the assembled bolt clamping tube maintains the tube structure state and its tube structure is stably shaped without loosening. This modified embodiment has the same technical effect as the above-mentioned sixteenth embodiment. For the corresponding content, reference can be made to the sixteenth embodiment, and it will not be repeated here.

[0440] Embodiment Seventeen

[0441] For the above-mentioned first embodiment, a limiting portion 124 is provided inside the bolt body to carry the bolt clamping tube, and the outer diameter of the bolt clamping tube 130 = the aperture of the bolt through-hole 123.

[0442] The main difference from the first embodiment is that: in the seventeenth embodiment, the fastening bolt further has a second positioning structure, which cooperates with the limiting portion to clamp the bolt clip tube in the direction of the connecting tube, so that the bolt clip tube moves synchronously with the bolt body; at the same time, the bolt body can also tightly fasten the bolt clip tube through the second positioning structure. The second positioning structure includes a second positioning groove provided on the inner wall of the second end of the bolt body and a second positioning protrusion provided on the outer wall of the second end of the bolt clip tube.

[0443] In the first embodiment, the bolt clip tube 130 (or its clip tube walls 131, 132) is placed between the bolt body 120 and the bulging portion 112, and then is inserted into the bolt through-hole 123 along the non-bulging portion 113 (or the connecting tube). In fact, the bolt clip tube 130 (or its clip tube walls 131, 132) is inserted into the interior of the bolt through-hole 123 (or the bolt body 120) from the second end of the bolt body 120; a limiting portion 124 is provided inside the bolt body 120 to support the bolt clip tube. In this way, the bolt body 120 inserted into the bolt through-hole is supported and limited by the limiting portion 124 inside the bolt body, so that it cannot go out from the first end of the bolt body; under the supporting action of the limiting portion 124, the bolt body 120 can drive the bolt clip tube 130 to move synchronously with it towards the second end direction of the non-bulging portion 113 (or the connecting tube). However, when the bolt body 120 moves towards the first end direction of the non-bulging portion 113 (or the connecting tube), the acting force of the bolt body 120 on the bolt clip tube 130 (such as the frictional force between the two) is limited, and the situation may occur that the bolt clip tube 130 does not move synchronously with it but separates.

[0444] To solve the above problems, so that when the bolt body moves towards the first end direction of the non-bulging portion (or the connecting tube), the bolt clip tube can also move synchronously with it and does not separate, a second positioning structure is provided on the fastening bolt in this embodiment.

[0445] In this embodiment, the second positioning structure includes a second positioning groove 1725 provided on the inner wall of the second end of the bolt body and a second positioning protrusion 1735 provided on the outer wall of the second end of the bolt clip tube. The second positioning groove 1725 is used to accommodate the second positioning protrusion 1735, as Figure 31As shown, the second positioning groove 1725 is an annular groove, and the second positioning protrusion 1735 is a continuous or discontinuous annular protrusion. When the bolt clamp tube 1730 is installed in the bolt body 1720, its first end is located on the limiting portion 1724, and the second positioning protrusion 1735 of the second end is located in the second positioning groove 1725. The second positioning groove 1725 clamps the second positioning protrusion 1735, so that when the bolt body 1720 moves toward the first end of the non-bulging part (or the connecting tube), the bolt body applies a force to the second positioning protrusion 1735 through the second positioning groove 1725, thereby driving the bolt clamp tube 1730 to move toward the first end of the non-bulging part (or the connecting tube). In the direction of the connecting tube (or non-bulging part), the bolt body clamps the bolt clamping tube 1730 through its limiting portion 1724 and the second positioning groove 1725, so that the bolt body 1720 and the bolt clamping tube 1730 are combined into one. When the bolt body moves on the connecting tube, whether it moves toward the first end of the connecting tube or toward the second end, the bolt body 1720 can drive the bolt clamping tube 1730 to move synchronously without separation.

[0446] In addition, in this embodiment, the bolt body can also tighten the bolt clamp tube through the second positioning structure. The shape and size of the second positioning groove 1725 match the second positioning protrusion 1735, and the maximum outer diameter of the second positioning protrusion 1735 is equal to the maximum inner diameter of the second positioning groove 1725. In this way, when the second positioning protrusion 1735 is located in the second positioning groove 1725, the bolt body 1720 can tighten the second positioning protrusion 1735 through its second positioning groove 1725, thereby tightening the bolt clamp tube 1730 formed by the splicing, so that the bolt clamp tube formed by the splicing maintains the tube structure state, and its tube structure is stable and fixed without loosening.

[0447] In the first embodiment, the outer diameter of the bolt clamp tube 130 is limited to the hole diameter of the bolt through hole 123, so that the bolt body 120 can tighten the bolt clamp tube 130 formed by the assembly through its inner wall (or the bolt through hole 123 can tighten the bolt clamp tube 130 through its hole wall), so that the bolt clamp tube remains in the assembled state in the bolt through hole; while in this embodiment, the maximum outer diameter of the second positioning protrusion 1735 is designed to be equal to the maximum inner diameter of the second positioning groove 1725, and the bolt body 1720 tightens the bolt clamp tube 1730 formed by the assembly through its second positioning groove 1725, so that the bolt clamp tube remains in the assembled state in the bolt through hole; in this embodiment, the outer diameter of the bolt clamp tube 1730 is equal to the hole diameter of the bolt through hole, or smaller than the hole diameter of the bolt through hole, and it can be combined with the bolt body to form a tightening bolt. The outer diameter restriction of the bolt clamp tube in this embodiment is more relaxed. This embodiment improves the mutually restrictive relationship between the bolt through hole diameter and the bolt clamp tube outer diameter, expands the applicable bolt clamp tube range, improves the adaptability of the bolt clamp tube and the bolt body, and has good application prospects.

[0448] It should be noted that when the outer diameter of the bolt clamping pipe 1730 < the aperture of the bolt through-hole, the second positioning structure in this embodiment can replace the tightening structure 1634 in the sixteenth embodiment. Compared with the tightening structure 1634 in the sixteenth embodiment, in addition to being able to tighten the bolt clamping pipe 1730, the second positioning structure in this embodiment can also cooperate with the limiting part to clamp the bolt clamping pipe in the direction where the connecting pipe is located, so that the bolt clamping pipe and the bolt body move synchronously and do not separate.

[0449] In this embodiment, the annular cross-sections of the second positioning groove 1725 and the second positioning protrusion 1735 are arc-shaped. As Figure 31 shown, the annular body of the arc shape is relatively smooth, so it is relatively easy for the second positioning protrusion 1735 to be pushed into or out of the second positioning groove 1725.

[0450] Embodiment Eighteen

[0451] For the above-mentioned Embodiment One, the outer diameter of the bolt clamping pipe 130 = the aperture of the bolt through-hole 123. Therefore, the bolt body 120 can tighten the bolt clamping pipe formed by splicing through its inner wall (or the bolt through-hole 123 can pass through its hole wall), so that the bolt clamping pipe maintains the pipe structure state.

[0452] The main difference from Embodiment One is that in this Embodiment Eighteen, there are concave and convex structures on each clamping pipe wall; at the adjacent joints of the bolt clamping pipe, the concave and convex structures of the adjacent clamping pipe walls are mutually embedded and form a complete pipe wall at the embedded joint; at the same time, the concave and convex structures of the adjacent clamping pipe walls also bite or hook each other, so as to form a connection between the adjacent clamping pipe walls and keep the bolt clamping pipe in the pipe structure state. In this embodiment, at the adjacent joints of the bolt clamping pipe, the concave and convex structure of one adjacent clamping pipe wall is a groove opened on the side surface, the groove extends along the direction where the bolt clamping pipe is located and the extension length is equal to the pipe length of the bolt clamping pipe, and the concave and convex structure of the other adjacent clamping pipe wall is a convex block arranged on the side surface, the convex block extends along the direction where the bolt clamping pipe is located and the extension length is equal to the pipe length of the bolt clamping pipe.

[0453] It has been clearly pointed out in Embodiment Sixteen of this article: In Embodiment One, the outer diameter of the bolt clamping pipe 130 = the aperture of the bolt through-hole 123. Therefore, the bolt clamping pipe 130 or its clamping pipe walls 131, 132 can be inserted into the bolt through-hole 123, and its outer wall is in close fit with the inner wall of the bolt body 120 (that is, the hole wall of the bolt through-hole). Therefore, when the bolt clamping pipe 130 is placed in the bolt through-hole 123, the bolt body 120 can tighten the bolt clamping pipe formed by splicing through its inner wall (or the bolt through-hole 123 can pass through its hole wall), so that the bolt clamping pipe formed by splicing maintains the pipe structure state and its pipe structure is stably formed and does not loosen. Embodiment One tightens the bolt clamping pipe through the bolt body. Therefore, it has requirements and limitations on the outer diameter of the bolt clamping pipe, and it is required that the outer diameter of the bolt clamping pipe = the aperture of the bolt through-hole.

[0454] If the outer diameter of the bolt clamping tube < the diameter of the bolt through-hole, although this bolt clamping tube, or rather its clamping tube wall, can be inserted into the bolt through-hole, it does not fit against the inner wall of the bolt body (i.e., the wall of the bolt through-hole). The bolt body cannot effectively tighten the formed bolt clamping tube, so that the adjacent clamping tube walls do not fit together, and gaps will be formed between the tube walls, resulting in uneven clamping and pushing forces on the bulging part in the circumferential direction; when the outer diameter of the bolt clamping tube is much smaller than the diameter of the bolt through-hole, the above phenomenon will be more obvious, and its clamping tube wall will even be loose and wobble in the bolt through-hole, and a bolt clamping tube with a stable structure cannot be formed.

[0455] To solve the above problems and keep the bolt clamping tube (including the bolt clamping tube with an outer diameter less than or equal to the diameter of the bolt through-hole) inserted into the bolt through-hole in a tube structure state and with a stable and fixed structure, the present embodiment provides a new technical solution. In the present embodiment, concave-convex structures are provided on each clamping tube wall. At each adjacent joint of the bolt clamping tube, the concave-convex structures of the adjacent clamping tube walls are mutually engaged and form a complete tube wall at the engagement position. At the same time, the concave-convex structures of the adjacent clamping tube walls also bite or hook each other, forming a connection between the adjacent clamping tube walls and enabling the bolt clamping tube to maintain the tube structure state.

[0456] In the present embodiment, the bolt clamping tube 1830 is a tube structure formed by the mutual engagement of the clamping tube walls 1831 and 1832; among them, grooves 1836 are provided on both side surfaces of the clamping tube wall 1832 as concave-convex structures, and protrusions 1837 are provided on both side surfaces of the clamping tube wall 1831 as concave-convex structures; at each adjacent joint of the bolt clamping tube, the protrusions 1837 of the clamping tube wall 1831 are inserted into the grooves 1836 of the clamping tube wall 1832, and the protrusions 1837 and the grooves 1836 form a complete tube wall at the engagement position (referring to the position where the protrusion is embedded in the groove, which belongs to or is located at the adjacent joint). At the same time, the protrusions 1837 and the grooves 1836 also bite each other, forming a connection between the adjacent clamping tube walls 1831 and 1832 at the adjacent joint and enabling the bolt clamping tube 1830 to maintain the tube structure state.

[0457] Specifically, protrusions 1837 are respectively provided on each side surface of the clamping tube wall 1831, and the protrusions 1837 on each side surface extend along the direction of the bolt clamping tube, from one end of the clamping tube wall to the other end. The extension length of each protrusion 1837 is equal to the tube length of the clamping tube wall 1831 or the bolt clamping tube 1830. Each protrusion 1837 protrudes from its side surface towards the outside of the tube wall along the circumferential direction of the tube wall; each protrusion has a head 1837g and a tail 1837h. The part of the protrusion connected to the side surface is the tail 1837h, and the rest is the head 1837g, and the head 1837g of the protrusion is larger than the tail 1837h, as Figure 32 shown.

[0458] On each side of the clamp pipe wall 1832, a groove 1836 is respectively provided, and the grooves 1836 on each side extend along the direction where the bolt clamp pipe is located, extending from one end of the clamp pipe wall to the other end. The extension length of each groove 1836 is equal to the pipe length of the clamp pipe wall 1832 or the bolt clamp pipe 1830. Each groove 1836 is recessed from its side along the circumferential direction of the pipe wall into the pipe wall; each groove has a notch 1836e and a groove bottom 1836d. Among them, the part of the groove close to the side is the notch 1836e (the notch faces the side), and the rest is the groove bottom 1836d (the groove bottom is far from the side), and the groove bottom 1836d of the groove is larger than the notch 1836e, as Figure 32 shown; the groove walls on both sides of each groove are respectively the inner wall and the outer wall of its clamp pipe wall. Each groove also has two ports 1836f; in this embodiment, each groove 1836 extends along the direction where the bolt clamp pipe is located, from one end of the clamp pipe wall to the other end. Therefore, ports 1836f are respectively formed at both ends of the clamp pipe wall by the groove 1836. The convex block 1837 can be embedded into the groove 1833 from the port 1836f of the groove, and can make the two ends of the clamp pipe walls 1831 and 1832 align when they are fitted together, as Figure 32 shown in the figure.

[0459] Ports 1936f are respectively formed on the inner wall and the outer wall of the clamp pipe wall by the groove 1936

[0460] The shape and size of the convex block 1837 match the groove 1836 into which it is embedded. At each adjacent part of the bolt clamp pipe 1830, the convex block 1837 of the clamp pipe wall 1831 is embedded into the groove 1833 of the clamp pipe wall 1832. The convex block 1837 and the groove 1836 form a complete pipe wall at the fitting part. And the head 1837g of the convex block is located at the groove bottom 1836d, and the tail 1837h is located at the notch 1836e. The head 1837g of the convex block is larger than the tail 1837h, that is, the head 1837g of the convex block is larger than the notch 1836e of the groove. Therefore, when the convex block 1837 is embedded into the groove 1833 from the port 1836f of the groove, the head 1837g of the convex block will be stuck at the notch 1836e of the groove and cannot pass through the notch 1836e. In this way, the convex block 1837 and the groove 1836 are mutually engaged along the circumferential direction of the pipe wall, and the adjacent clamp pipe walls 1831 and 1832 form a connection at the adjacent part, so that the bolt clamp pipe formed by fitting maintains the pipe structure state, and its pipe structure is stably fixed and does not come loose.

[0461] The shape of the convex block 1837 and the groove 1836 engaged with it is the cross-sectional shape perpendicular to its extension direction. In this embodiment, the shape of the convex block 1837 and the groove 1836 engaged with it is also the shape presented at the end of the bolt clamp pipe. In this embodiment, the shape of the convex block 1837 and the groove 1836 engaged with it is a convex shape, as Figure 33As shown in (1); it should be noted that in this embodiment, the shapes of the bump 1837 and the groove 1836 engaged with it can also be designed into other shapes, including but not limited to arc-shaped, trapezoidal, pentagonal, hexagonal, deformed trapezoidal, racket-shaped (which can also be called a deformed arc-shaped), petal-shaped (which can also be called cat's paw-shaped or deformed arc-shaped), Christmas tree-shaped (which can also be called a deformed triangle-shaped or arrow-shaped), etc., as Figure 33 shown in (2)-(9) of the figure. In this embodiment, at least part of the head of the bump is larger than its tail, and correspondingly, at least part of the bottom of the groove is larger than its notch. In this way, the groove catches the head of the bump through its notch, so that the bump and the groove form a complete pipe wall at the engagement part and also bite each other, forming a connection between the adjacent pipe walls at the adjacent part; the specific shape of the groove (or the bump) in this embodiment is not limited, nor is it limited in other related embodiments.

[0462] In this embodiment, by providing bumps and grooves on the side surface of the pipe wall of the clip as concave-convex structures, the adjacent pipe walls of the clip are engaged with each other at the engagement part to form a complete pipe wall and at the same time bite each other to form a connection, so that the bolt clip pipe formed by the engagement maintains the pipe structure state and has a stable and fixed structure, without relying on the tightening effect of the bolt body. Therefore, the requirement for the outer diameter of the bolt clip pipe in this embodiment is relatively loose. The outer diameter of the bolt clip pipe 1730 is equal to or less than the aperture of the bolt through-hole, and it can be used in cooperation with the bolt body. This embodiment improves the restrictive relationship between the aperture of the bolt through-hole and the outer diameter of the bolt clip pipe, expands the applicable range of the bolt clip pipe, improves the adaptability between the bolt clip pipe and the bolt body, and has good application prospects.

[0463] Based on the above, the present invention also provides a deformation example, which is specifically as follows:

[0464] The main difference from the above-mentioned Embodiment 18 is that: in this deformed embodiment, a groove 1836 is provided as a concave-convex structure on one side surface of the pipe wall 1831 of the clip, and a bump 1837 is provided as a concave-convex structure on the other side surface; similarly, a groove 1836 is provided as a concave-convex structure on one side surface of the pipe wall 1832 of the clip, and a bump 1837 is provided as a concave-convex structure on the other side surface, as Figure 34 shown in (1) of the figure.

[0465] At an adjacent part of the bolt clip pipe 1830, the bump 1837 of the pipe wall 1831 is embedded in the groove 1836 of the pipe wall 1832; at another adjacent part of the bolt clip pipe 1830, the bump 1837 of the pipe wall 1832 is embedded in the groove 1836 of the pipe wall 1831. This deformed embodiment has the same technical effect as the above-mentioned embodiment, and will not be repeated here.

[0466] Based on the above, the present invention also provides another deformation example, which is specifically as follows:

[0467] The main difference from the eighteenth embodiment above is that: in this modified embodiment, on each side of the clip pipe wall 1831, a number of bumps 1837 are distributed along the direction where the bolt clip pipe is located. The length of each bump 1837 is less than the pipe length of the bolt clip pipe, and the bumps 1837 are not connected to each other. In this modified embodiment, the number and length of the bumps on each side are not limited, nor are they limited in other related examples. In actual applications, they can be designed according to needs. In this modified embodiment, there are bumps 1837 provided at the second end of the bolt clip pipe to ensure the formation of a complete pipe wall at the second end of the bolt clip pipe, so that the second end of the bolt clip pipe serves as the first clamping portion, providing uniform clamping and pushing forces for the bulging portion of the externally inserted pipe in the circumferential direction, as shown in Figure 34 shown in (2) of

[0468] It should be noted that in this modified embodiment, the bumps 1837 on one side of the clip pipe wall 1831 can extend from one end of the clip pipe wall to the other end along the direction where the bolt clip pipe is located and be equal in length to the clip pipe wall 1832 or the bolt clip pipe 1830. On the other side, a number of bumps 1837 are distributed along the direction where the bolt clip pipe is located, and there are bumps 1837 provided at the second end of the bolt clip pipe, as shown in Figure 34 shown in (3) of

[0469] Nineteenth Embodiment

[0470] For the eighteenth embodiment above, at each adjacent part of the bolt clip pipe, the concave-convex structure of one adjacent clip pipe wall is a groove opened on the side surface. The groove extends along the direction where the bolt clip pipe is located and the extension length is equal to the pipe length of the bolt clip pipe. The concave-convex structure of the other adjacent clip pipe wall is a bump provided on the side surface. The bump extends along the direction where the bolt clip pipe is located and the extension length is equal to the pipe length of the bolt clip pipe.

[0471] The main difference from the eighteenth embodiment is that: in this nineteenth embodiment, at each adjacent part of the bolt clip pipe, the concave-convex structure of one adjacent clip pipe wall is a number of grooves opened on the side surface. The number of grooves are distributed along the direction where the bolt clip pipe is located. Each groove extends along the direction of the pipe diameter and penetrates the pipe wall; the concave-convex structure of the other adjacent clip pipe wall is a number of bumps provided on the side surface. The number of bumps are distributed along the direction where the bolt clip pipe is located. Each bump extends along the direction of the pipe diameter and the extension length is equal to the wall thickness of the pipe wall.

[0472] To solve the problems described in the eighteenth embodiment and keep the bolt clip pipe (including the bolt clip pipe with an outer diameter less than or equal to the aperture of the bolt through-hole) inserted into the bolt through-hole in a pipe structure state and with a stable and fixed structure, this embodiment provides a new technical solution, which is different from the technical solution of the eighteenth embodiment.

[0473] In this embodiment, the bolt clamp tube 1930 is a tube structure formed by the clamping tube walls 1931 and 1932 fitting into each other; wherein, a plurality of grooves 1936 are formed as concave-convex structures on both side surfaces of the clamping tube wall 1932, and a plurality of protrusions 1937 are provided as concave-convex structures on both side surfaces of the clamping tube wall 1931; at the adjacent joints of the bolt clamp tube, the protrusions 1937 on one side surface of the clamping tube wall 1931 are respectively embedded into the grooves 1936 at corresponding positions on one side surface of the clamping tube wall 1932, and the complete tube wall is formed at the fitting positions of the protrusions 1937 and the corresponding grooves 1936. Meanwhile, the protrusions 1937 and the grooves 1936 are engaged with each other, so that the adjacent clamping tube walls 1931 and 1932 are connected at the adjacent joints, and the bolt clamp tube 1930 maintains the tube structure state.

[0474] Specifically, a plurality of protrusions 1937 are respectively provided on each side surface of the clamping tube wall 1931, and the protrusions 1937 on each side surface are distributed along the direction of the bolt clamp tube; each protrusion 1937 extends along the direction of the tube diameter, and its extension length is equal to the wall thickness of the tube wall. That is to say, each protrusion 1937 extends from the outer wall of the clamping tube wall to the inner wall (or from the inner wall of the clamping tube wall to the outer wall) along the direction of the tube diameter. Each protrusion 1937 protrudes from its side surface along the circumferential direction of the tube wall to the outside of the tube wall; each protrusion has a head 1937g and a tail 1937h. The protrusion takes the part connected to the side surface as the tail 1937h and the rest as the head 1937g, and the head 1937g of the protrusion is larger than the tail 1937h, as Figure 35 shown.

[0475] A plurality of grooves 1936 are respectively formed on each side surface of the clamping tube wall 1932, and the grooves 1936 on each side surface are distributed along the direction of the bolt clamp tube; each groove 1936 extends along the direction of the tube diameter and penetrates the tube wall (or its extension length is equal to the wall thickness of the tube wall). That is to say, each groove 1936 extends from the outer wall of the clamping tube wall to the inner wall (or from the inner wall of the clamping tube wall to the outer wall) along the direction of the tube diameter. Each groove 1936 is recessed from its side surface along the circumferential direction of the tube wall to the inside of the tube wall; each groove has a notch 1936e and a bottom 1936d. Among them, the groove takes the part close to the side surface as the notch 1936e (the notch faces the side surface) and the rest as the bottom 1936d (the bottom is far from the side surface), and the bottom 1936d of the groove is larger than the notch 1936e, as Figure 35 shown. Each groove also has two ports 1936f; in this embodiment, each groove 1936 extends along the direction of the tube diameter, from the outer wall of the clamping tube wall to the inner wall (or from the inner wall of the clamping tube wall to the outer wall), and penetrates the tube wall. Therefore, ports 1936f are respectively formed on the inner wall and the outer wall of the clamping tube wall by the groove 1936, and the protrusion 1937 can be embedded into the groove 1936 from the port 1936f of the groove.

[0476] At each adjacent location of the bolt clamp tube 1930, the bumps 1937 on the side surface of the clamp tube wall 1931, their quantity and installation positions correspond to the grooves 1936 on the side surface of the clamp tube wall 1932, and the shape and size of the bumps 1937 match those of the grooves 1936. Each bump 1937 on the clamp tube wall 1931 is respectively embedded into the groove 1933 at the corresponding position on the clamp tube wall 1932. The bump 1937 and the groove 1936 form a complete tube wall at the fitting location, and the head 1937g of the bump is located at the bottom 1936d of the groove, and the tail 1937h of the bump is located at the notch 1936e of the groove. The head 1937g of the bump is larger than the tail 1937h, that is, the head 1937g of the bump is larger than the notch 1936e of the groove. Therefore, when the bump 1937 is embedded into the groove 1933 from the port 1936f of the groove, the head 1937g of the bump will be stuck at the notch 1936e of the groove and cannot pass through the notch 1936e. In this way, the bump 1937 and the groove 1936 are mutually engaged in the circumferential direction along the tube wall, and the adjacent clamp tube walls 1931 and 1932 form a connection at the adjacent location, so that the bolt clamp tube formed by fitting maintains the tube structure state, and its tube structure is stably shaped and does not come loose. In this embodiment, the quantity and positions of the grooves or bumps on each side surface of the clamp tube wall are not limited, nor are they limited in other related embodiments. As long as the grooves and bumps on the adjacent clamp tube walls at the adjacent location of the bolt clamp tube can correspond and fit.

[0477] The shapes of the bump 1937 and the groove 1936 engaged with it are the cross-sectional shapes perpendicular to their extending directions. In this embodiment, the shapes of the bump 1937 and the groove 1936 engaged with it are also the shapes presented on the outer wall or inner wall of the bolt clamp tube. In this embodiment, the shapes of the bump 1937 and the groove 1936 engaged with it are trapezoidal, as Figure 36 shown in (1) of the figure. It should be noted that in this embodiment, the shapes of the bump 1937 and the groove 1936 engaged with it can also be designed into other shapes, including but not limited to arc-shaped, convex-shaped, pentagonal, hexagonal, deformed trapezoidal, racket-shaped (which can also be called a deformed arc-shaped), petal-shaped (which can also be called cat's claw-shaped or deformed arc-shaped), Christmas tree-shaped (which can also be called a deformed triangular or arrow-shaped), etc., as Figure 36 shown in (2)-(9) of the figure. In this embodiment, at least part of the head of the bump is larger than its tail. Correspondingly, at least part of the bottom of the groove is larger than its notch. In this way, the groove catches the head of the bump through its notch, so that while the bump and the groove form a complete tube wall at the fitting location, they are also mutually engaged, forming a connection between the adjacent clamp tube walls at the adjacent location; the specific shapes of the grooves (or rather, the bumps) in this embodiment are not limited, nor are they limited in other related embodiments.

[0478] In this embodiment, the distribution and arrangement of the bumps and grooves on the side surface of the clip pipe wall are different from those in the eighteenth embodiment. However, they also serve as concave-convex structures to enable adjacent clip pipe walls to fit together at the fitting position to form a complete pipe wall and at the same time bite into each other to form a connection, so that the bolt clip pipe formed by fitting maintains the pipe structure state and has a stable and fixed shape without relying on the tightening effect of the bolt body. This embodiment has the same technical effects as the eighteenth embodiment above. For the relevant technical effects, please refer to the eighteenth embodiment, and they will not be repeated here.

[0479] Embodiment Twenty

[0480] For the above-mentioned eighteenth embodiment, at each adjacent joint of the bolt clip pipe, the concave-convex structure of one adjacent clip pipe wall is a groove opened on the side surface. The groove extends along the direction of the bolt clip pipe and the extension length is equal to the pipe length of the bolt clip pipe. The concave-convex structure of the other adjacent clip pipe wall is a bump provided on the side surface. The bump extends along the direction of the bolt clip pipe and the extension length is equal to the pipe length of the bolt clip pipe.

[0481] The main difference from the eighteenth embodiment is that in this twentieth embodiment, at each adjacent joint of the bolt clip pipe, the concave-convex structure of one adjacent clip pipe wall is a groove opened on the inner wall. This groove is defined as the first groove. The first groove extends along the direction of the bolt clip pipe and the extension length is equal to the pipe length of the bolt clip pipe. The concave-convex structure of the other adjacent clip pipe wall is a groove opened on the outer wall. This groove is defined as the second groove. The second groove extends along the direction of the bolt clip pipe and the extension length is equal to the pipe length of the bolt clip pipe.

[0482] To solve the problems described in the eighteenth embodiment and enable the bolt clip pipe inserted into the bolt through-hole (including the bolt clip pipe with an outer diameter less than or equal to the aperture of the bolt through-hole) to maintain the pipe structure state and have a stable and fixed shape, this embodiment also provides a new technical solution, which is different from the technical solutions of the eighteenth and nineteenth embodiments.

[0483] In this embodiment, the bolt pipe clamp 2030 is a pipe structure formed by the clamping pipe walls 2031 and 2032 fitting into each other; among them, second grooves 2036 are provided on the outer walls on both sides of the clamping pipe wall 2032 as concave-convex structures, and first grooves 2038 are provided on the inner walls on both sides of the clamping pipe wall 2031 as concave-convex structures; at the adjacent joints of the bolt pipe clamp, the outer side wall of the first groove 2038 (the outer side wall is the groove side wall where the side surface of the clamping pipe wall is located, and the outer side wall in this embodiment is equivalent to the convex block 1837 in Embodiment 18) is embedded into the second groove 2036, and at the same time the outer side wall of the second groove 2036 is embedded into the first groove 2038. The first groove 2038 and the second groove 2036 form a complete pipe wall at the fitting position. At the same time, the outer side wall of the first groove 2038 and the outer side wall of the second groove 2036 are hooked to each other, so that the adjacent clamping pipe walls 2031 and 2032 are connected at the adjacent joints, so that the bolt pipe clamp 1930 maintains the pipe structure state.

[0484] Specifically, first grooves 2038 are respectively provided on the inner walls on both sides of the clamping pipe wall 2031. The first grooves 2038 on the inner walls on both sides extend along the direction of the bolt pipe clamp, from one end of the clamping pipe wall to the other end, and the extension length of each first groove 2038 is equal to the pipe length of the clamping pipe wall 2031 or the bolt pipe clamp 2030. Each first groove 2038 is recessed from the inner wall of the clamping pipe wall towards the outer wall along the pipe diameter direction; each first groove 2038 has a notch 2038e and a bottom 2038d. Among them, the part of the first groove 2038 close to the inner wall is the notch 2038e (the notch faces the inner wall), and the remaining part is the bottom 2038d (the bottom 2038d is far from the inner wall). Each first groove 2038 also has two ports 2038f; in this embodiment, each first groove 2038 extends from one end of the clamping pipe wall to the other end along the direction of the bolt pipe clamp. Therefore, ports 2038f are respectively formed at both ends of the clamping pipe wall by the first groove 2038, as Figure 37 shown.

[0485] Similarly, second grooves 2036 are respectively formed on the outer walls on both sides of the clip pipe wall 2032. The second grooves 2036 on both outer walls extend along the direction of the bolt clip pipe, from one end of the clip pipe wall to the other end, and the extension length of each second groove 2036 is equal to the pipe length of the clip pipe wall 2032 or the bolt clip pipe 2030. Each second groove 2036 is formed by recessing from the outer wall of the clip pipe wall towards the inner wall in the pipe diameter direction; each second groove 2036 has a notch 2036e and a groove bottom 2036d. Among them, the part of the second groove 2036 close to the outer wall is the notch 2036e (the notch faces the outer wall), and the rest is the groove bottom 2036d (the groove bottom 2036d is away from the outer wall). Each second groove 2036 also has two ports 2036f; in this embodiment, each second groove 2036 extends from one end of the clip pipe wall to the other end along the direction of the bolt clip pipe. Therefore, ports 2036f are respectively formed at both ends of the clip pipe wall of the second groove 2036, as Figure 37 shown.

[0486] Mutually engaged grooves, the shape and size of the outer side wall of one groove match those of the other groove. In this embodiment, the outer side wall 2036k of the second groove 2036, its shape and size match those of the first groove 2038. The outer side wall 2036k is embedded in the first groove 2038 and forms a complete pipe wall structure with the first groove 2038, which means that: in the pipe diameter direction, the height of the outer side wall 2036k + the thickness of the groove bottom 2038d = the wall thickness of the bolt clip pipe or the clip pipe wall; in the circumferential direction along the pipe wall, the wall thickness of the outer side wall 2036k = the groove width of the first groove 2038; similarly, the outer side wall 2038k of the first groove 2038, its shape and size match those of the second groove 2036. The outer side wall 2038k is embedded in the second groove 2036 and forms a complete pipe wall structure with the second groove 2036, which means that: in the pipe diameter direction, the height of the outer side wall 2038k + the thickness of the groove bottom 2036d = the wall thickness of the bolt clip pipe or the clip pipe wall; in the circumferential direction along the pipe wall, the wall thickness of the outer side wall 2038k = the groove width of the second groove 2036.

[0487] The shape of the outer side wall and the groove engaged therewith (such as the outer side wall 2036k and the first groove 2038, the outer side wall 2038k and the second groove 2036) is the cross-sectional shape perpendicular to its extension direction. In this embodiment, the shape of the outer side wall and the groove engaged therewith is also the shape presented at the end of the bolt clip pipe. In this embodiment, the shape of the outer side wall and the groove engaged therewith is rectangular, as Figure 37As shown; thus, the outer wall can be inserted from the notch of the groove or from the port of the groove. For example, the rectangular outer wall 2038k can be inserted into the rectangular second groove 2036 from the notch 2036e or the port 2036f; the rectangular outer wall 2036k can be inserted into the rectangular first groove 2038 from the notch 2038e or the port 2038f.

[0488] At each adjacent part of the bolt clamp pipe 2030, the outer wall 2038k is inserted into the second groove 2036, and the outer wall 2036k is inserted into the first groove 2038. The first groove 2038 and the second groove 2036 are mutually engaged and form a complete pipe wall at the engagement part; at the same time, along the circumferential direction of the pipe wall, the outer wall 2038k of the first groove 2038 and the outer wall 2036k of the second groove 2036 are mutually hooked, and the adjacent clamp pipe walls 2031 and 2032 are connected in the circumferential direction, so that the bolt clamp pipe formed by the engagement maintains the pipe structure state, and its pipe structure is stably formed and does not come loose. This embodiment can achieve the same technical effect as Embodiment XVIII above. For the relevant technical effects, refer to Embodiment XVIII, and they will not be repeated here.

[0489] Based on the above, the present invention also provides a deformation example, specifically as follows:

[0490] The main difference from Embodiment XX above is that in this deformation embodiment, a first groove 2038 is provided on the inner wall of one side of the clamp pipe wall 2031 as the concave-convex structure, and a second groove 2036 is provided on the outer wall of the other side as the concave-convex structure; a first groove 2038 is also provided on the inner wall of one side of the clamp pipe wall 2032 as the concave-convex structure, and a second groove 2036 is provided on the outer wall of the other side as the concave-convex structure, as Figure 38 shown.

[0491] At an adjacent part of the bolt clamp pipe 2030, the first groove 2038 on the inner wall of the clamp pipe wall 2031 is mutually engaged with the second groove 2036 on the outer wall of the clamp pipe wall 2032, the outer wall 2036k is inserted into the first groove 2038, and the outer wall 2038k is inserted into the second groove 2036; at another adjacent part of the bolt clamp pipe 2030, the second groove 2036 on the outer wall of the clamp pipe wall 2031 is mutually engaged with the first groove 2038 on the inner wall of the clamp pipe wall 2032, the outer wall 2036k is inserted into the first groove 2038, and the outer wall 2038k is inserted into the second groove 2036. This deformation embodiment has the same technical effect as the above embodiment, and will not be repeated here.

[0492] Based on the above, the present invention also provides another deformation example, specifically as follows:

[0493] The main difference from the above-mentioned Embodiment 20 is that: in this embodiment, the shapes of the outer sidewall and the groove fitted therewith can be designed with reference to the shapes of the bump 1837 and the groove 1836 fitted therewith in Embodiment 18, including but not limited to convex shape, arc shape, trapezoid, pentagon, hexagon, deformation of trapezoid, racket shape (which can also be called the deformation of arc shape), petal shape (which can also be called cat's paw shape or the deformation of arc shape), Christmas tree shape (which can also be called the deformation of triangle or arrow shape), etc., as Figure 39 shown.

[0494] In this way, the outer sidewall can only be inserted into the groove from the port of the groove. For example, the outer sidewall 2038k can only be inserted into the second groove 2036 from the notch 2036e, and the outer sidewall 2036k can only be inserted into the first groove 2038 from the notch 2038e; the outer sidewall inserted into the groove will be stuck at the notch of the groove and cannot pass through the notch. In this way, the outer sidewall and the groove are mutually engaged in the direction of the pipe diameter. For example, when the outer sidewall 2038k is inserted into the second groove 2036, it will be stuck at the notch of the second groove 2036, and the outer sidewall 2038k and the second groove 2036 are mutually engaged in the direction of the pipe diameter; when the outer sidewall 2036k is inserted into the first groove 2038, it will be stuck at the notch of the first groove 2038, and the outer sidewall 2036k and the first groove 2038 are mutually engaged in the direction of the pipe diameter. In this modified embodiment, the first groove 2038 and the second groove 2036 are hooked to each other in the circumferential direction of the pipe wall and are mutually engaged in the direction of the pipe diameter, which will make the fitting and connection of the adjacent pipe wall clamps 2031 and 2032 more stable and firm. This modified embodiment has the same technical effect as the above-mentioned embodiment, and will not be repeated here.

[0495] Embodiment 21

[0496] For the above-mentioned Embodiment 18, at each adjacent joint of the bolt pipe clamp, the concave-convex structure of one adjacent pipe wall clamp is a groove opened on the side surface, the groove extends along the direction of the bolt pipe clamp and the extension length is equal to the pipe length of the bolt pipe clamp, and the concave-convex structure of the other adjacent pipe wall clamp is a bump provided on the side surface, the bump extends along the direction of the bolt pipe clamp and the extension length is equal to the pipe length of the bolt pipe clamp.

[0497] The main difference from Embodiment 18 is that: in this Embodiment 21, each pipe wall clamp of the bolt pipe clamp itself is a mountain-shaped pipe wall structure, and the mountain-shaped pipe wall structure is used as the concave-convex structure, and the adjacent pipe wall clamps in the bolt pipe clamp are arranged in opposite directions.

[0498] To solve the problems described in the eighteenth embodiment, and to keep the bolt clamping tube (including the bolt clamping tube with an outer diameter less than or equal to the aperture of the bolt through-hole) inserted into the bolt through-hole in a tube structure state and with a stable and fixed structure, this embodiment also provides a new technical solution, which is different from the technical solutions of the eighteenth, nineteenth, and twentieth embodiments.

[0499] In this embodiment, the bolt clamping tube 2130 is a tube structure formed by the mutual engagement of the clamping tube walls 2131 and 2132; among them, the clamping tube walls 2131 and 2132 are both mountain-shaped tube wall structures and use their mountain-shaped tube wall structures as concave-convex structures; in the bolt clamping tube 2130, the clamping tube walls 2131 and 2132 are arranged in opposite directions, so that at the adjacent joints of the bolt clamping tube, the clamping tube walls 2131 and 2132 are mutually engaged through the mountain-shaped tube wall structures to form a complete tube wall. At the same time, they are also hooked through the mountain-shaped tube wall structures, so that the adjacent clamping tube walls 2131 and 2132 are connected at the adjacent joints, making the bolt clamping tube 1930 maintain a tube structure state.

[0500] Specifically, each clamping tube wall (including the clamping tube walls 2131 and 2132) is a mountain-shaped tube wall structure, having a base wall, a main wall, side walls, and grooves; on one side of the base wall, a main wall is provided at the middle position, and side walls are respectively provided at both ends (in this embodiment, the side walls are equivalent to the convex blocks 1837 in the eighteenth embodiment), and grooves are respectively formed between the main wall and the side walls on both sides of it. The sum of the lengths of the base wall and the main wall is the tube length of the bolt clamping tube; as Figure 40 shown, the clamping tube wall 2131 has a base wall 2131x, a main wall 2131y, two side walls 2137, and two grooves 2136; the clamping tube wall 2132 has a base wall 2132x, a main wall 2132y, two side walls 2137', and two grooves 2136'.

[0501] At each adjacent joint of the bolt clamp pipe, the side wall of an adjacent clamp pipe wall is embedded into the groove of another adjacent clamp pipe wall; the side wall of each clamp pipe wall, its shape and size are matched with the groove into which it is embedded. In this embodiment, the side wall 2137 of the clamp pipe wall 2131, its shape and size are matched with the groove 2136' of the clamp pipe wall 2132 into which it is embedded. The side wall 2137 is embedded into the groove 2136' to form a complete pipe wall structure with the groove 2136', which means that: in the circumferential direction of the pipe wall, the arc length of the side wall 2137 = the arc length of the groove 2136'; in the direction of the bolt clamp pipe, the length of the side wall 2137 = the groove depth of the groove 2136'. Similarly, the side wall 2137' of the clamp pipe wall 2132, its shape and size are matched with the groove 2136 of the clamp pipe wall 2131 into which it is embedded. The side wall 2137' is embedded into the groove 2136 to form a complete pipe wall structure with the groove 2136, which means that: in the circumferential direction of the pipe wall, the arc length of the side wall 2137' = the arc length of the groove 2136; in the direction of the bolt clamp pipe, the length of the side wall 2137' = the groove depth of the groove 2136.

[0502] At each end of the bolt clamp pipe, the base wall of an adjacent clamp pipe wall is joined with the main wall of another adjacent clamp pipe wall and a complete pipe wall is formed at the joint. At the same time, the sum of the arc lengths of the base walls and the main walls at this end is equal to the circumference of the bolt clamp pipe. In this embodiment, at one end of the bolt clamp pipe 2130, the base wall 2131x of the clamp pipe wall 2131 is joined with the main wall 2132y of the clamp pipe wall 2132 and a complete pipe wall is formed at the joint. At the same time, at this end: the arc length of the base wall 2131x + the arc length of the main wall 2132y = the circumference of the bolt clamp pipe 2130; at the other end of the bolt clamp pipe 2130, the clamp pipe wall 2132 has the base wall 2132x joined with the main wall 2131y of the clamp pipe wall 2131 and a complete pipe wall is formed at the joint. At the same time, at this end: the arc length of the base wall 2132x + the arc length of the main wall 2131y = the circumference of the bolt clamp pipe 2130.

[0503] In the bolt clamp tube, the adjacent clamp tube walls are arranged in opposite directions. In this embodiment, the clamp tube walls 2131 and 2132 of the bolt clamp tube 2130 are arranged in opposite directions. In this way, at each adjacent joint of the bolt clamp tube 2130, the side wall 2137 is embedded in the groove 2136', the side wall 2137' is embedded in the groove 2136, and at the same time, the base wall 2131x is joined with the main wall 2132y, and the base wall 2132x is joined with the main wall 2131y; the clamp tube walls 2131 and 2132 are mutually embedded through the mountain-shaped tube wall structure to form a complete tube wall. At the same time, along the circumferential direction of the tube wall, the side wall 2137 (of the clamp tube wall 2131) and the side wall 2137' (of the clamp tube wall 2132) are mutually hooked, and the adjacent clamp tube walls 2131 and 2132 are connected in the circumferential direction, so that the bolt clamp tube formed by embedding maintains the tube structure state, and its tube structure is stably shaped and does not come loose.

[0504] In this embodiment, by designing the clamp tube wall itself as a mountain-shaped tube wall structure and arranging adjacent clamp tube walls in opposite directions, the clamp tube walls are mutually embedded to form a tube structure, and are mutually hooked at the joints of the clamp tube walls, so that the bolt clamp tube formed by embedding maintains the tube structure state, and its tube structure is stably shaped and does not come loose. The technical solution provided in this embodiment has the same technical effect as that in Embodiment XVIII. For the relevant technical effects, reference can be made to Embodiment XX, and they will not be repeated here.

[0505] Embodiment XXII

[0506] In Embodiment I, when the fastening bolt and the fastening nut are screwed tightly, they will respectively clamp and press into the bulging part of the outer tube from both sides of the bulging part (or the joint). The bulging part and the outer tube outside it are firmly pressed together, so as to fix the connection between the connecting tube and the outer tube, and at the same time, multiple seals are formed at the joint between the connecting tube and the outer tube.

[0507] The main difference from Embodiment I is that in this Embodiment XXII, the fastening bolt and the fastening nut have a third positioning structure for indicating the proper fastening position of the fastening bolt and the fastening nut; the third positioning structure includes a third positioning groove provided on the inner wall of the fastening nut and a third positioning protrusion provided on the outer wall of the fastening bolt.

[0508] In Embodiment I, the fastening bolt and the fastening nut are screwed tightly, so that on the first side of the bulging part, the fastening bolt clamps and presses into the bulging part of the outer tube through the first clamping part 133, and presses the first bearing surface 112a and the outer tube 150 outside it tightly together to form a seal; on the second side of the bulging part, the fastening nut clamps and presses into the bulging part of the outer tube through the second clamping part 141, and presses the second bearing surface 112b and the outer tube 150 outside it tightly together to form a seal.

[0509] The fastening bolt and the fastening nut need to be screwed tightly in a spiral manner and tightened to an appropriate degree to achieve the above effects. However, the appropriate tightening degree of the two cannot be predicted and depends on the personal experience of the operator. If the fastening of the fastening bolt and the fastening nut is insufficient, fluid leakage or even disconnection of the connection may occur; if the fastening bolt and the fastening nut are over-tightened, the device may be damaged. In addition, the fastening bolt and the fastening nut are threadedly connected, and the fastening nut may become loose due to vibration during use.

[0510] To solve the above problems, to screw the fastening bolt and the fastening nut to an appropriate tightening degree, improve the quality and efficiency of the screwing operation, and prevent loosening, etc., the present embodiment provides a new technical solution. In this embodiment, a third positioning structure is provided on the fastening bolt and the fastening nut to indicate the appropriate fastening position of the two.

[0511] In this embodiment, the third positioning structure includes a third positioning groove 2245 provided on the inner wall of the fastening nut and a third positioning protrusion 2225 provided on the outer wall of the fastening bolt; the third positioning groove 2245 is an annular groove located on the first side of the thread structure of the fastening nut; the third positioning protrusion 2225 is a continuous or discontinuous annular protrusion provided on the bolt rod and located on the first side of the thread structure of the fastening bolt.

[0512] At the connection between the connecting pipe and the external pipe, the fastening bolt (specifically, the bolt body 2220) and the fastening nut 2240 are screwed tightly in a spiral manner. When the two are screwed close to the appropriate fastening position, the operator needs to apply a slightly larger screwing force to push the third positioning protrusion 2225 into the third positioning groove 2245. In this way, through the change of the screwing force, the operator can easily judge the appropriate fastening position of the fastening bolt and the fastening nut. When the bolt body 2220 and the fastening nut 2240 are screwed tightly to the appropriate fastening position, on the first side of the bulging part, the fastening bolt is clamped by the first clamping part and pressed into the bulging part of the external pipe, pressing the first bearing surface and the outer layer of the external pipe tightly together to form a seal; on the second side of the bulging part, the fastening nut 2240 is clamped by the second clamping part and pressed into the bulging part of the external pipe, pressing the second bearing surface and the outer layer of the external pipe tightly together to form a seal.

[0513] At the same time, when the bolt body 2220 and the fastening nut 2240 are screwed tightly to the appropriate fastening position, the third positioning protrusion 2225 is located in the third positioning groove 2245, and the third positioning groove 2245 catches the third positioning protrusion 2225. A slightly larger screwing force is required to push the third positioning protrusion 2225 out of the annular groove 2245. Therefore, the problem of loosening of the fastening nut can be effectively prevented.

[0514] In this embodiment, the shape and size of the third positioning groove 2245 match those of the third positioning protrusion 2225. The annular cross-sections of the third positioning groove 2245 and the third positioning protrusion 2225 are arc-shaped, as Figure 41 shown. The annular body of the arc shape is smooth, so that the third positioning protrusion 2225 can be pushed into or out of the third positioning groove 2245.

[0515] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be construed as a limitation of the present invention. After those skilled in the art have read the above content, various modifications and alternatives to the present invention will be obvious. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims

1. A pipe connection device, characterized in that: include: The connecting body has at least two connecting tubes; each connecting tube is provided with a bulging portion, the bulging portion is used to press into the external tube, so that the external tube is in an expanded state, and the connecting tube is connected to the external tube; A plurality of fastening bolts, which can be inserted into the connecting pipe and arranged on one side of the bulging part; a first clamping part is arranged inside the fastening bolts for clamping and pushing the bulging part of the external pipe; A plurality of fastening nuts are provided, which can be put on the external tube and arranged on the other side of the bulging part; a second clamping part is provided inside the fastening nut for clamping and pushing the bulging part of the external tube; the fastening nut is threadedly connected with the fastening bolt, and the two are respectively clamped and pushed into the bulging part of the external tube from both sides of the bulging part, so as to fix the connection between the connecting tube and the external tube and form a seal.

2. The pipe connection device according to claim 1, characterized in that: The bulging portion is formed by the outer wall of the connecting pipe bulging outwards; The bulging portion is located at the second end of the connecting pipe; The end or side of each component close to the connection body in the assembled state is the first end or the first side, and the end or the side away from the connection body is the second end or the second side.

3. The pipe connection device according to claim 2, characterized in that: The bulging portion has a first pressure-bearing surface and a second pressure-bearing surface; Wherein, the first pressure-bearing surface is located at the first side of the bulging portion, and the second pressure-bearing surface is located at the second side of the bulging portion; The first pressure-bearing surface and the second pressure-bearing surface are conical surfaces; In the direction along the connecting pipe and pointing to the second end thereof, the outer diameter of the first pressure-bearing surface gradually increases, and the outer diameter of the second pressure-bearing surface gradually decreases.

4. The pipe connection device according to claim 3, characterized in that: The bulging portion also has a third pressure-bearing surface; The third pressure-bearing surface is located between the first pressure-bearing surface and the second pressure-bearing surface; The third pressure-bearing surface is a cylindrical curved surface; In the direction along the connecting pipe, the outer diameter of the third pressure-bearing surface remains unchanged.

5. The pipe connection device according to any one of claims 3 or 4, characterized in that: The maximum outer diameter of the bulging portion is the outer diameter of the third pressure-bearing surface; or, The maximum outer diameter of the bulging portion is the maximum outer diameter of the first pressure-bearing surface or the second pressure-bearing surface.

6. The pipe connection device according to claim 5, characterized in that: The bulge forms a seal with the outer tube at its maximum outer diameter.

7. The pipe connection device according to claim 1, characterized in that: Each connecting pipe also has a non-bulging portion; The non-bulging portion is the portion of the connecting pipe other than the bulging portion.

8. The pipe connection device according to any one of claims 1 or 7, characterized in that: The non-bulging portion is located at a first side of the bulging portion, and the fastening bolt is sleeved on the non-bulging portion.

9. The pipe connection device according to claim 8, characterized in that: The non-bulging portion adjoining the bulging portion is also pressed into the outer tube.

10. The pipe connection device according to claim 1, characterized in that: The first clamping portion and the second clamping portion are circular ring structures.

11. The pipe connection device according to any one of claims 3 or 10, characterized in that: The first composite outer diameter R1 ≤ the inner diameter of the first clamping portion < the second composite outer diameter R2; wherein the first composite outer diameter R1 is the outer diameter of the non-bulging portion pressed into the external tube, and the second composite outer diameter R2 is the maximum outer diameter of the bulging portion pressed into the external tube; The first clamping part clamps and pushes the first pressure-bearing surface and the outer layer external tube thereof, so that a seal is formed between the first pressure-bearing surface and the external tube.

12. The pipe connection device according to claim 11, characterized in that: The inner wall of the first clamping portion is a cylindrical curved surface, and the first clamping portion clamps and presses the first pressure-bearing surface and its outer layer external tube through its inner edge; or, The inner wall of the first clamping part has a conical surface and can fit with the first pressure-bearing surface. The first clamping part clamps and presses the first pressure-bearing surface and its outer layer external tube through its conical inner wall.

13. The pipe connection device according to any one of claims 3 or 10, characterized in that: The outer diameter of the outer tube ≤ the inner diameter of the second clamping portion < the second composite outer diameter R2; wherein the second composite outer diameter R2 is the maximum outer diameter of the bulging portion pressed into the outer tube; The second clamping part clamps and pushes the second pressure-bearing surface and the outer layer external tube thereof, so that a seal is formed between the second pressure-bearing surface and the external tube.

14. The pipe connection device according to claim 13, characterized in that: The inner wall of the second clamping portion is a cylindrical curved surface, and the second clamping portion clamps and presses the second pressure-bearing surface and its outer layer external tube through its inner edge; or, The inner wall of the second clamping part has a tapered surface and can fit with the second pressure-bearing surface. The second clamping part clamps and presses the second pressure-bearing surface and its outer layer external tube through its tapered inner wall.

15. The pipe connection device according to claim 2, characterized in that: The end surface of the bulging portion is a conical curved surface; In a direction along the connecting pipe and pointing to the second end thereof, the inner diameter of the port has an increasing trend.

16. The pipe connection device according to claim 1, characterized in that: The diameters of the connecting pipes are the same or different; The inner diameter of each connecting pipe is consistent with the inner diameter of the external pipe it is connected to.

17. The pipe connection device according to claim 1, characterized in that: The connecting body also has a cavity, and the cavity is communicated with each connecting pipe; The connection body is any one of a two-way, three-way or multi-way pipe connection structure.

18. The pipe connection device according to claim 17, characterized in that: A valve body is arranged in the cavity to control the connection or disconnection between the cavity and each connecting pipe.

19. The pipe connection device according to claim 1, characterized in that: The outer wall of the fastening bolt is provided with a threaded structure to cooperate with the fastening nut for threaded connection.

20. The pipe connection device according to claim 1, characterized in that: The fastening nut has a nut body; The inner wall of the nut body is provided with a threaded structure for threaded connection with the fastening bolt.

21. The pipe connection device according to claim 20, characterized in that: The second clamping portion is disposed inside the nut body; The second clamping portion is located on a second side of the threaded structure of the nut body.

22. The pipe connection device according to claim 1, characterized in that: The fastening bolt and the fastening nut also have a third positioning structure for indicating the proper fastening position of the fastening bolt and the fastening nut; At the appropriate tightening position, the tightening bolts and the tightening nuts secure the connection between the connecting pipe and the external pipe, and form multiple seals at the connection between the connecting pipe and the external pipe.

23. The pipe connection device according to claim 22, characterized in that: The third positioning structure includes a third positioning groove disposed on the inner wall of the fastening nut and a third positioning protrusion disposed on the outer wall of the fastening bolt; When the fastening bolt and the fastening nut are screwed to a moderately fastened position, the third positioning protrusion is inserted into the third positioning groove.

24. The pipe connection device according to any one of claims 22, characterized in that: The third positioning groove is an annular groove located on the first side of the thread structure of the fastening nut; The third positioning protrusion is a continuous or discontinuous annular protrusion, and is located on the first side of the thread structure of the fastening bolt; The shape and size of the third positioning groove match those of the third positioning protrusion.

25. The pipe connection device according to claim 23, characterized in that: The ring body cross sections of the third positioning groove and the third positioning protrusion are both arc-shaped.

26. The pipe connection device according to claim 1, characterized in that: The pipe connecting device and the external pipe are made of synthetic resin material.

27. The pipe connection device according to claim 1, characterized in that: The number of the fastening bolts and the fastening nuts is determined according to the number of the connecting pipes or the bulging parts.

28. A fastening bolt, applicable to the pipe connection device according to any one of claims 1 to 27, characterized in that: The fastening bolt can be inserted into the connecting pipe and arranged on one side of the bulging part; a first clamping part is arranged inside the fastening bolt for clamping and pushing the bulging part of the external pipe.

29. The fastening bolt according to claim 28, characterized in that Each fastening bolt comprises a bolt body and a bolt clamp tube; A bolt through hole is provided inside the bolt body, and the bolt clamp tube is placed in the bolt through hole; The bolt body can pass through the bulging part from the second end of the connecting tube and be inserted into the non-bulging part; the bolt clamping tube is a tube structure formed by splicing or chiming, which can be spliced ​​or chime-formed around the non-bulging part or the outer tube of its outer layer.

30. The fastening bolt according to claim 29, characterized in that The bolt clamp tube is formed by splicing or embedding two or more clamp tube walls; Each clamping tube wall of the bolt clamping tube is an arc-shaped tube wall and has the same length; The arc sizes of the clamping tube walls are the same or different.

31. The fastening bolt according to claim 29, characterized in that The bolt clamp pipe is formed by splicing a pipe structure with pipe seams; The pipe seam is arranged along the direction where the bolt clamps the pipe.

32. The fastening bolt according to claim 29, characterized in that The bolt through hole is arranged along the direction of the fastening bolt and penetrates the bolt body; The diameter of the bolt through hole is greater than the maximum outer diameter of the bulging portion.

33. The fastening bolt according to claim 29, characterized in that The bolt body comprises a bolt shank and a bolt head; The bolt head is located at the first end of the bolt rod; The thread structure of the fastening bolt is arranged on the bolt rod.

34. The fastening bolt according to claim 33, characterized in that The bolt body also has a limiting portion; The limiting portion is located inside the bolt through hole and is used to support the bolt clamping tube.

35. The fastening bolt according to claim 34, characterized in that The limiting part at least has a limiting body and a center hole; wherein, The limiting body is arranged on the inner wall of the bolt body along the circumferential direction; the center hole is located at the center position of the limiting body, and the diameter of the center hole is smaller than the diameter of the bolt through hole.

36. The fastening bolt according to claim 35, characterized in that At least the outer diameter of the bolt clamp tube is greater than the aperture of the center hole, so that the limiting body can bear the bolt clamp tube; the aperture of the center hole is greater than the maximum outer diameter of the bulging part, so that the bolt body can pass through the bulging part.

37. The fastening bolt according to any one of claims 34 to 36, characterized in that: The limiting portion is a circular ring structure; The limiting body is a ring body of a circular ring structure, and the center hole is a ring hole of a circular ring structure; The inner diameter of the bolt clamp tube is ≥ the diameter of the center hole.

38. The fastening bolt according to claim 37, characterized in that The entire end surface of the first end of the bolt clamping tube is located on the limiting body.

39. A fastening bolt as claimed in any one of claims 30, 31 or 37, characterized in that The limiting part also has a plurality of through holes, and the through holes are opened on the limiting body; The bolt clamp tube or each of its clamp tube walls corresponds to at least one through hole, and a portion of the end surface is located at the corresponding through hole.

40. The fastening bolt according to claim 39, characterized in that By setting marks at visible positions of the bolt body to specify the adjacent positions of each adjacent tube wall, at least one through hole is opened in the limiting body area between any two adjacent marks, and the tube clamping wall located in the limiting body area corresponds to at least one through hole.

41. The fastening bolt according to claim 39, characterized in that There are at least N through holes on the limiting body evenly distributed in the circumferential direction, so that the end face of the first end of any clamping wall is located at at least one through hole, and each clamping wall corresponds to at least one through hole; wherein N is a positive integer, N×min(L1)≥the circumference of the bolt clamping tube>(N-1)×min(L1), and min(L1) is the arc length of the clamping wall with the smallest arc length among all the clamping walls assembled to form the bolt clamping tube.

42. The fastening bolt according to any one of claims 34 to 36, characterized in that: The limiting part is a circular ring structure; The limiting body is a ring body of a circular ring structure, and the center hole is a ring hole of a circular ring structure; The diameter of the center hole is greater than the inner diameter of the bolt clamp tube.

43. The fastening bolt according to claim 42, characterized in that The outer end surface of the first end of the bolt clamp tube is located on the limiting body, and the inner end surface is located in the center hole.

44. The fastening bolt according to any one of claims 34 to 36, characterized in that: The limiting part is formed by a plurality of convex teeth distributed along the circumferential direction on the inner wall of the bolt body; The limiting body is a plurality of convex teeth; the central hole is a hole surrounded by a plurality of convex teeth distributed along the circumferential direction; The limiting part also has a gap, which is a space formed between adjacent convex teeth; The inner diameter of the bolt clamp tube is ≥ the diameter of the center hole.

45. The fastening bolt according to claim 44, characterized in that The outer end surface and the inner end surface of the first end of the bolt clamping tube are both located on the limiting body.

46. ​​A fastening bolt as claimed in any one of claims 31 or 44, characterized in that When the bolt clamp pipe is formed by splicing a pipe structure with a pipe gap, part of its end surface is located in the gap.

47. A fastening bolt as claimed in any one of claims 30 or 44, characterized in that When the bolt clamp is formed by splicing or interlocking two or more clamp walls, The arc length of any gap is less than the arc length of any clamping wall among all the clamping walls forming the bolt clamping pipe, so that each clamping wall has at least one convex tooth to carry the load.

48. The fastening bolt according to claim 47, characterized in that The arc length of any convex tooth is less than the arc length of any tube clamping wall among all the tube clamping walls forming the bolt tube clamping, so that a part of the end surface of the first end of each tube clamping wall is located in the gap.

49. The fastening bolt according to any one of claims 34 to 36, characterized in that: The limiting part is formed by a plurality of convex teeth distributed along the circumferential direction on the inner wall of the bolt body; The limiting body is a plurality of convex teeth; the central hole is a hole surrounded by a plurality of convex teeth distributed along the circumferential direction; The limiting part also has a gap, which is a space formed between adjacent convex teeth; The diameter of the center hole is greater than the inner diameter of the bolt clamp tube.

50. The fastening bolt according to claim 49, characterized in that The outer end surface of the first end of the bolt clamp tube is located on the limiting body, and the inner end surface is located in the center hole.

51. A fastening bolt as claimed in any one of claims 31 or 50, characterized in that When the bolt clamp tube is formed by splicing a tube structure with a tube gap, a portion of the outer end surface of the first end is located in the gap.

52. The fastening bolt according to any one of claims 30 or 50, characterized in that When the bolt clamp is formed by splicing or interlocking two or more clamp walls, The arc length of any gap is less than the arc length of any clamping wall among all the clamping walls forming the bolt clamping pipe, so that each clamping wall has at least one convex tooth to carry the load.

53. The fastening bolt according to claim 52, characterized in that The arc length of the convex teeth ≥ the arc length of the clamping tube wall; or, If the arc length of the convex teeth is less than the arc length of the tube clamping wall, the tube clamping wall and the outer end surface of the first end thereof still have a part of the end surface located in the gap.

54. The fastening bolt according to claim 34, characterized in that The length of the bolt clamp tube is ≤ the maximum length of the non-bulging part between the bolt body and the bulging part; and The length of the bolt clamping tube is equal to the distance from the limiting portion to the second end of the bolt body.

55. The fastening bolt according to claim 34, characterized in that Each fastening bolt can contain two or even more bolt clamps; The length of each bolt clamp tube is ≤ the maximum length of the non-bulging part between the bolt body and the bulging part that is inserted into the non-bulging part; and, The sum of the tube lengths of the bolt clamping tubes is equal to the distance from the limiting portion to the second end of the bolt body.

56. The fastening bolt according to claim 54, characterized in that The limiting portion is moved or extended toward the second end of the bolt body, thereby shortening the distance from the limiting portion to the second end of the bolt body.

57. The fastening bolt according to claim 28, characterized in that The first composite outer diameter R1 ≤ the inner diameter of the first clamping portion < the second composite outer diameter R2; wherein the first composite outer diameter R1 is the outer diameter of the non-bulging portion pressed into the external tube, and the second composite outer diameter R2 is the maximum outer diameter of the bulging portion pressed into the external tube; The first clamping part clamps and pushes the first pressure-bearing surface and the outer layer external tube thereof, so that a seal is formed between the first pressure-bearing surface and the external tube.

58. The fastening bolt according to claim 57, characterized in that The inner wall of the first clamping portion is a cylindrical curved surface, and the first clamping portion clamps and presses the first pressure-bearing surface and its outer layer external tube through its inner edge; or, The inner wall of the first clamping part has a conical surface and can fit with the first pressure-bearing surface. The first clamping part clamps and presses the first pressure-bearing surface and its outer layer external tube through its conical inner wall.

59. The fastening bolt according to claim 29, characterized in that The outer diameter of the bolt clamp tube is ≤ the diameter of the bolt through hole; The inner diameter of the bolt clamp tube is ≥ the first composite outer diameter R1, wherein the first composite outer diameter R1 is the outer diameter of the non-bulging portion of the pressed outer tube.

60. The fastening bolt according to any one of claims 57 or 59, characterized in that When the inner diameter of the bolt clamped tube is less than the second composite outer diameter R2, the first clamping portion may be the second end of the bolt clamped tube; wherein the second composite outer diameter R2 is the maximum outer diameter of the bulging portion pressed into the outer tube.

61. The fastening bolt according to claim 57, characterized in that The first clamping portion is a circular ring structure disposed in the bolt clamping tube; the inner diameter of the circular ring structure is less than the second composite outer diameter R2, and the circular ring structure is disposed on the inner wall of the second end of the bolt clamping tube along the circumferential direction; The second composite outer diameter R2 is the maximum outer diameter of the bulged portion pressed into the outer tube.

62. The fastening bolt according to claim 59, characterized in that When the outer diameter of the bolt clamp tube equals the hole diameter of the bolt through hole, the bolt body clamps the bolt clamp tube formed by the assembly through its inner wall, so that the bolt clamp tube maintains the tube structure state; When the outer diameter of the bolt clamp tube is less than the hole diameter of the bolt through hole, a clamping structure is provided on the outer wall of the bolt clamp tube, and the outer diameter of the clamping structure is equal to the hole diameter of the bolt through hole. The bolt body clamps the clamping structure through its inner wall to keep the bolt clamp tube in a tube structure state.

63. The fastening bolt according to claim 62, characterized in that The tight hoop structure is a complete circular ring structure; or, The tight hoop structure is an incomplete circular ring structure and is composed of a number of discontinuous circular ring segments.

64. The fastening bolt according to claim 62, characterized in that The clamping structure is arranged at the second end of the bolt clamping tube.

65. The fastening bolt according to claim 30, characterized in that The bolt clamp has a first positioning structure for positioning two adjacent clamp walls so that the two ends of the two adjacent clamp walls are aligned; The first positioning structure includes a positioning pin arranged on a side surface of an adjacent tube clamping wall, and a positioning groove arranged on a side surface of another adjacent tube clamping wall.

66. The fastening bolt according to claim 65, characterized in that At the adjacent part of the bolt clamp tube, the setting position, quantity and shape of the positioning pin on the side of one adjacent clamp tube wall match the setting position, quantity and shape of the positioning groove on the side of another adjacent clamp tube wall.

67. The fastening bolt according to claim 34, characterized in that The fastening bolt also has a second positioning structure; The second positioning structure cooperates with the limiting part to clamp the bolt clamping tube in the direction of the connecting tube, so that the bolt clamping tube and the bolt body move synchronously; at the same time, the bolt body can also tighten the bolt clamping tube through the second positioning structure.

68. A fastening bolt as claimed in any one of claims 67, characterized in that The second positioning structure includes a second positioning groove disposed on the inner wall of the second end of the bolt body, and a second positioning protrusion disposed on the outer wall of the second end of the bolt clamping tube; When the first end of the bolt body reaches the limiting portion, the second positioning protrusion is located in the second positioning groove.

69. The fastening bolt according to claim 68, characterized in that The second positioning groove is an annular groove; The second positioning protrusion is a continuous or discontinuous annular protrusion; The shape and size of the second positioning groove match those of the second positioning protrusion, and the maximum outer diameter of the second positioning protrusion is equal to the maximum inner diameter of the second positioning groove.

70. The fastening bolt according to claim 69, characterized in that The ring body cross-sections of the second positioning groove and the second positioning protrusion are both arc-shaped.

71. The fastening bolt according to claim 30, characterized in that Each clamping tube wall is provided with a concave-convex structure; At each adjacent part of the bolt clamp, the concave-convex structures of adjacent clamp walls fit together to form a complete tube wall; at the same time, the concave-convex structures of adjacent clamp walls also bite or hook each other to form a connection between adjacent clamp walls and keep the bolt clamp in a tube structure state.

72. The fastening bolt according to claim 71, characterized in that At each adjacent part of the bolt clamp tube, the concave-convex structure of an adjacent clamp tube wall is a groove opened on the side surface, and the groove extends along the direction of the bolt clamp tube, and its extension length is equal to the length of the bolt clamp tube; The concave-convex structure of another adjacent tube clamping wall is a convex block arranged on the side surface, the convex block extends along the direction where the bolt clamps the tube, and its extension length is equal to the length of the bolt clamping tube; or, The concave-convex structure of another adjacent tube clamping wall is a plurality of protrusions arranged on the side surface, the plurality of protrusions are distributed along the direction where the bolt clamps the tube, and a protrusion is arranged at the second end of the bolt clamping tube, each protrusion extends along the direction where the bolt clamps the tube, and its extension length is less than the length of the bolt clamping tube.

73. The fastening bolt according to claim 71, characterized in that At each adjacent part of the bolt clamping tube, the concave-convex structure of an adjacent clamping tube wall is a plurality of grooves opened on the side surface, the plurality of grooves are distributed along the direction where the bolt clamping tube is located, and each groove extends along the direction where the tube diameter is located and penetrates the tube wall; The concave-convex structure of another adjacent pipe clamping wall is a plurality of protrusions arranged on the side surface, the plurality of protrusions are distributed along the direction where the bolt clamps the pipe, each protrusion extends along the direction where the pipe diameter is located, and its extension length is equal to the wall thickness of the pipe.

74. A fastening bolt as claimed in any one of claims 72 or 73, characterized in that At each adjacent position of the bolt clamp tube, the upper protrusion of an adjacent clamp tube wall is embedded in the groove of another adjacent clamp tube wall; The shape and size of the protrusion match the groove in which it is embedded, and a complete tube wall is formed at the embedded position.

75. The fastening bolt according to claim 73, characterized in that At each adjacent part of the bolt clamp tube, the number and arrangement position of the projections on the side of an adjacent clamp tube wall correspond to the grooves on the side of another adjacent clamp tube wall.

76. A fastening bolt as claimed in any one of claims 72 or 73, characterized in that The protrusion is formed by protruding from the side surface of the protrusion toward the outside of the tube wall along the circumferential direction of the tube wall, and has a head and a tail; the part of the protrusion connected to the side surface is the tail, and the rest of the part is the head, and at least part of the head of the protrusion is larger than the tail; The groove is formed by being sunken from its side surface into the tube wall along the circumferential direction of the tube wall, and has a groove opening and a groove bottom; the groove has a portion close to the side surface as the groove opening, and the remaining portion as the groove bottom, and at least a portion of the groove bottom of the groove is larger than the groove opening; When the protrusion is embedded in the groove, its head is located at the groove bottom and its tail is located at the notch. The groove clamps the head of the protrusion through the notch, so that the protrusion and the groove are engaged with each other and adjacent clamping walls are connected at the adjacent parts.

77. A fastening bolt as claimed in claim 76, characterized in that The groove also has an end, and the protrusion is embedded in the groove from the end of the groove.

78. The fastening bolt according to claim 74, characterized in that The shape of the protrusion and the groove engaged therewith can be any one of a convex shape, an arc shape, a trapezoid, a pentagon, a hexagon, a deformation of a trapezoid, a racket shape, a cat's paw shape, and a Christmas tree shape.

79. A fastening bolt as claimed in any one of claims 72 or 73, characterized in that Grooves are provided on both sides of the tube clamping wall as a concave-convex structure; or, Both sides of the tube clamping wall are provided with convex blocks as concave-convex structures; or, A groove is provided on one side surface of the tube clamping wall as a concave-convex structure, and a convex block is provided on the other side surface as a concave-convex structure.

80. The fastening bolt according to claim 71, characterized in that At each adjacent part of the bolt clamp tube, the concave-convex structure of an adjacent clamp tube wall is a groove opened on the inner wall, and the groove is the first groove. The first groove extends along the direction of the bolt clamp tube, and the extension length is equal to the length of the bolt clamp tube. The concave-convex structure of another adjacent tube clamping wall is a groove opened on the outer wall, and the groove is the second groove. The second groove extends along the direction where the bolt clamps the tube, and the extension length is equal to the length of the bolt clamping tube.

81. The fastening bolt as claimed in claim 80, characterized in that At each adjacent part of the bolt clamp tube, the outer side wall of an adjacent clamp tube wall is embedded in the groove of another adjacent clamp tube wall; wherein, The outer side wall of the first groove has a shape and size that matches the second groove in which it is embedded, and forms a complete tube wall at the embedded position; The shape and size of the outer side wall of the second groove match the first groove in which it is embedded, and a complete tube wall is formed at the embedded position.

82. The fastening bolt according to claim 80, characterized in that The first groove is formed by being recessed from the inner wall of the clamping tube wall toward the outer wall along the tube diameter direction, and has a groove opening and a groove bottom; The first groove has a portion close to the inner wall as a groove opening and the remaining portion as a groove bottom; The second groove is formed by being recessed from the outer wall of the clamping tube wall toward the inner wall along the tube diameter direction, and has a groove opening and a groove bottom; The second groove has a portion close to the outer wall as a groove opening and the remaining portion as a groove bottom.

83. The fastening bolt according to claim 82, characterized in that The first groove or the second groove further has a port; The outer side wall of the first groove is embedded in the second groove from the end of the second groove; The outer side wall of the second groove is embedded in the first groove from the end of the first groove.

84. The fastening bolt according to claim 81, characterized in that The shape of each outer side wall and the groove engaged therewith can be any one of a rectangle, a convex shape, an arc shape, a trapezoid, a pentagon, a hexagon, a deformation of a trapezoid, a racket shape, a cat's paw shape, and a Christmas tree shape.

85. A fastening bolt as claimed in any one of claims 83 or 84, characterized in that When the shapes of each outer side wall and the groove engaged therewith are rectangular, each outer side wall can also be embedded in the groove from the notch.

86. The fastening bolt according to claim 80, characterized in that The inner walls on both sides of the tube clamping wall are provided with first grooves as the concave-convex structure; or, Second grooves are provided on the outer walls on both sides of the tube clamping wall as a concave-convex structure; or, On the inner wall of one side of each clamping pipe wall, a first groove is provided as a concave-convex structure, and on the outer wall of the other side, a second groove is provided as a concave-convex structure.

87. The fastening bolt according to claim 71, wherein Each clamping pipe wall of the bolt clamping pipe itself has a mountain-shaped pipe wall structure, and uses its mountain-shaped pipe wall structure as a concave-convex structure, and the adjacent clamping pipe walls in the bolt clamping pipe are arranged in opposite directions.

88. The fastening bolt according to claim 87, wherein Each clamping pipe wall has a base wall, a main wall, side walls, and grooves; On one side of the base wall, a main wall is provided at the middle position, and side walls are provided at both ends respectively. Grooves are formed between the main wall and the side walls on both sides of it. The sum of the lengths of the base wall and the main wall is the pipe length of the bolt clamping pipe.

89. The fastening bolt according to claim 88, wherein At each adjacent joint of the bolt clamping pipe, the side wall of one adjacent clamping pipe wall is embedded into the groove of the other adjacent clamping pipe wall; The shape and size of each side wall match the groove into which it is embedded, and a complete pipe wall is formed at the fitting place.

90. The fastening bolt according to claim 88, wherein At each end of the bolt clamping pipe, the base wall of one adjacent clamping pipe wall is joined with the main wall of the other adjacent clamping pipe wall, and a complete pipe wall is formed at the joint; At the same time, the sum of the arc lengths of the base walls and the main walls at this end is equal to the circumference of the bolt clamping pipe.

91. A pipe connection method, applicable to the pipe connection device according to any one of claims 1 to 27, characterized in that: Comprising the following steps: The bolt body passes through the bulging part from the second end of the connecting pipe and is sleeved on the non-bulging part; The fastening nut is sleeved on the outer pipe; Press both the bulging part and the part of the non-bulging part connected to it into the outer pipe. The outer pipe is in an expanded diameter state, a connection is formed between the connecting pipe and the outer pipe, and the fastening nut is located on the second side of the bulging part; The bolt clamping pipe is installed in the bolt body to form a fastening bolt; the formed fastening bolt is sleeved on the non-bulging part and is located on the first side of the bulging part; Screw the fastening bolts and the fastening nuts on both sides of the bulging part tightly. By applying pushing forces in opposite directions to the bulging part pressed into the outer pipe through the fastening bolts and the fastening nuts, the connection between the connecting pipe and the outer pipe is fixed, and at the same time, multiple seals are formed at the connection.

92. The pipe connection method according to claim 91, wherein At the non-bulging part between the bolt body and the bulging part, each clamping pipe wall surrounds the non-bulging part or the outer pipe outside it and is installed in the bolt through-hole along the non-bulging part to form a fastening bolt; or, At the non-bulging part between the bolt body and the bulging part, each clamping pipe wall is respectively installed into the bolt body along the non-bulging part and is joined in the bolt through-hole to form a bolt clamping pipe to form a fastening bolt.

93. The pipe connection method according to claim 91, wherein At the non-bulging part between the bolt body and the bulging part, spread the pipe seam of the bolt clamping pipe, surround the non-bulging part or the outer pipe outside it with the bolt clamping pipe, and install the bolt clamping pipe into the bolt through-hole along the non-bulging part to form a fastening bolt.

94. The pipe connection method according to claim 91, wherein Screw the fastening bolt and the fastening nut tightly to a moderately tightened position.

95. A pipe disassembly method, applicable to the pipe connection device according to any one of claims 1 to 27, characterized in that: Comprising the following steps: Unscrew the fastening bolt and the fastening nut spirally; The connecting pipe is withdrawn from the external pipe and is disassembled from the external pipe; The fastening bolt is separated from the bulging portion along the non-bulging portion, and the bolt clamping tube or the clamping tube wall thereof is removed from the bolt through hole; The bolt body is removed from the second end of the connecting pipe through the bulging portion; Remove the retaining nut from the outer tube.

96. The disassembly method according to claim 95, characterized in that: Push the bolt clamp tube out of the bolt body, disassemble the adjacent clamp tube walls, and remove the bolt clamp tube from the non-bulging part; or, Push the clamp tube wall out of the bolt body and remove it from the non-bulging part.

97. The pipe disassembly method of claim 95, wherein: Push the bolt clamp tube out of the bolt body, open the tube gap of the bolt clamp tube, and remove the bolt clamp tube from the non-bulging part.

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