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

Abstract

The invention discloses a pipe connecting device and a fastening nut and pipe connecting and detaching method thereof. The pipe connecting device comprises a connecting body, a fastening nut and a fastening bolt, 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 nut is provided with a nut body and a nut clamping pipe, and the nut body can penetrate through the bulging part to be arranged on the connecting pipe in a penetrating and sleeving mode; the nut 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 nut 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 nut and the fastening bolt 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 specifically relates to a pipe connection device and its fastening nut and connection and disassembly method used in the manufacturing process of technical fields such as semiconductors, liquid crystal display panels, photovoltaics, biotechnology, pharmaceuticals, medical equipment, microelectronics, optics, magnetic disks, automobile industry, aviation and aerospace fields. Background Art

[0002] In the manufacturing process of technical fields such as semiconductors, liquid crystal display panels, photovoltaics, biotechnology, pharmaceuticals, medical equipment, microelectronics, optics, disks, automotive industry, aviation and aerospace, the fluids used are mostly corrosive chemical liquids, gases or some fluids with ultra-high purity requirements. Such fluids are usually transported in machinery and equipment using resin conduits. The corrosion resistance of the resin conduits can resist the erosion of chemical fluids. Its 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 conduits and between the resin conduits and the equipment need to be connected by pipe connecting devices. Such pipe connecting devices are usually made of the same resin material as the resin conduits. Therefore, the commonly used resin materials include tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer (PFA, also known as perfluoroalkyl compound, 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 may easily occur at the connection point and even cause a safety accident. Therefore, a pipe connection device with excellent connection and sealing effects and stability is needed to ensure the safety of the resin catheter connection. Summary of the invention

[0005] The present invention provides a pipe connection device and a fastening nut thereof and a connection and disassembly method, wherein the pipe connection device is used to connect an external pipe for conveying fluid and connect a fluid conveying pipeline. The pipe connection device clamps and pushes the bulging part of the external pipe from both sides of the bulging part through the threaded connection of the fastening nut and the fastening bolt, thereby clamping and fixing the bulging part and the external pipe on the outer layer thereof, so that the connection between the connecting pipe and the external pipe is fixed and the stability of the connection is ensured, and multiple seals are formed at the connection between the connecting pipe and the external pipe, thereby 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 expand the external pipe and connect the connecting pipe with the external pipe;

[0008] A number of fastening nuts that can be sleeved on the connecting pipe and are arranged on one side of the bulging portion; the fastening nut has a first clamping portion for clamping and pushing the bulging portion pressed into the external pipe;

[0009] A number of fastening bolts that can be sleeved on the external pipe and are arranged on the other side of the bulging portion; the fastening bolt has a second clamping portion for clamping and pushing the bulging portion pressed into the external pipe;

[0010] The fastening bolt is threadedly connected to the fastening nut, and the two respectively clamp and push the bulging portion pressed into the external pipe from both sides of the bulging portion 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 bearing surface and a second bearing surface;

[0015] Wherein, the first bearing surface is located on the first side of the bulging portion, and the second bearing surface is located on the second side of the bulging portion;

[0016] The first bearing surface and the second 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 bearing surface gradually increases, and the outer diameter of the second bearing surface gradually decreases.

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

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

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

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

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

[0023] 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.

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

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

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

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

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

[0029] Optionally, the first clamping portion and the second clamping portion are in 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; where,

[0031] the first composite outer diameter R1 is the outer diameter at the non-bulging portion pressed into the outer tube, and the second composite outer diameter R2 is the maximum outer diameter at the bulging 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 conical curved surface inner wall.

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

[0036] the second composite outer diameter R2 is the maximum outer diameter at the bulging 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 portion has a conical curved surface and can be fitted to the second pressure-bearing surface. The second clamping portion clamps and presses the second pressure-bearing surface and the outer external pipe through its inner wall of the conical curved surface.

[0040] Optionally, the end face of the bulging portion 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 diameters of the respective 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 external pipe it is connected to.

[0044] Optionally, the connecting body further has a cavity, and the cavity communicates with the respective connecting pipes;

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

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

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

[0048] Optionally, the fastening bolt has a bolt rod, a bolt head and a bolt through-hole;

[0049] The outer wall of the bolt rod is provided with a threaded structure, and this threaded structure is located at the first end of the bolt rod to cooperate with the fastening nut for threaded connection;

[0050] The bolt head is located at the second end of the bolt rod.

[0051] Optionally, the outer diameter of the external pipe ≤ the inner diameter of the bolt through-hole < the second composite outer diameter R2;

[0052] Wherein, the second composite outer diameter R2 is the maximum outer diameter at the bulging portion where the external pipe is pressed in;

[0053] The second clamping portion is the first end of the fastening bolt, and the inner diameter of the second clamping portion is the inner diameter of the bolt through-hole.

[0054] Optionally, the fastening nut and the fastening bolt further have a third positioning structure for indicating the proper fastening position of the fastening nut and the fastening bolt;

[0055] At the proper fastening position, the fastening nut and the fastening bolt fix 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.

[0056] Optionally, 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;

[0057] When the fastening nut and the fastening bolt are screwed to a proper tightening position, the third positioning protrusion is inserted into the third positioning groove.

[0058] Optionally, the third positioning groove is an annular groove located on the second side of the thread structure of the fastening bolt;

[0059] The third positioning protrusion is a continuous or discontinuous annular protrusion provided on the bolt rod and located on the second side of the thread structure of the fastening bolt;

[0060] The shape and size of the third positioning groove match those of the third positioning protrusion.

[0061] Optionally, the cross-sections of the annular bodies of the third positioning groove and the third positioning protrusion are both arc-shaped.

[0062] Optionally, the pipe connection device and the external pipe are made of synthetic resin materials.

[0063] Optionally, the number of the fastening nuts and the fastening bolts is determined according to the number of the connecting pipes or the bulges.

[0064] Another technical solution of the present invention is to provide a fastening nut applicable to any one of the above-mentioned pipe connection devices;

[0065] The fastening nut can be sleeved on the connecting pipe and is arranged on one side of the bulge; the fastening nut has a first clamping portion for clamping and pushing the bulge of the external pipe pressed in.

[0066] Optionally, each fastening nut includes a nut body and a nut pipe clip;

[0067] A nut through-hole is formed inside the nut body, and the nut pipe clip is placed inside the nut through-hole;

[0068] The nut body can pass through the second end of the connecting pipe, pass through the bulge, and be sleeved on the non-bulging part;

[0069] The nut pipe clip is a pipe structure formed by splicing or fitting, and can be formed by surrounding the non-bulging part or the external pipe on its outer layer by splicing or fitting.

[0070] Optionally, the nut pipe clip is formed by splicing or fitting two or more clip pipe walls;

[0071] Each clip pipe wall of the nut pipe clip is an arc-shaped pipe wall and has the same length;

[0072] The arc sizes of the clip pipe walls are the same or not completely the same.

[0073] Optionally, the nut pipe clip is formed by splicing a pipe structure with a pipe seam;

[0074] The pipe seam is arranged along the direction of the nut pipe clip.

[0075] Optionally, the nut through-hole is arranged along the direction of the fastening nut and penetrates through the nut body;

[0076] The aperture of the nut through-hole > the maximum outer diameter of the bulging part.

[0077] Optionally, a thread structure is provided on the inner wall of the nut body, and this thread structure is located at the second end of the nut body for mating with the thread structure of the fastening bolt for threaded connection.

[0078] Optionally, the nut body further has a limiting part;

[0079] The limiting part is located inside the nut through-hole and on the first side of its thread structure;

[0080] The limiting part is used to carry the nut pipe clip.

[0081] Optionally, the limiting part at least has a limiting body and a central hole; wherein,

[0082] The limiting body is arranged on the inner wall of the nut 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 nut through-hole.

[0083] Optionally, at least the outer diameter of the nut pipe clip > the aperture of the central hole, so that the limiting body can carry the nut pipe clip;

[0084] The aperture of the central hole > the maximum outer diameter of the bulging part, so that the nut body can pass through the bulging part.

[0085] Optionally, the limiting part is a ring structure;

[0086] Its limiting body is a ring body of a ring structure, and the central hole is a ring hole of a ring structure;

[0087] The inner diameter of the nut pipe clip ≥ the aperture of the central hole.

[0088] Optionally, the entire end face at the first end of the nut pipe clip is on the limiting body.

[0089] Optionally, the limiting part 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 nut pipe clip or each clip pipe wall thereof, and a part of the end face is at its corresponding through hole.

[0090] Optionally, the adjacent positions of each adjacent pipe wall are specified by setting identifiers at visible positions on the nut body, such that at least one through hole is provided within the limiting body region between any two adjacent identifiers, and the clamping pipe wall located in the limiting body region corresponds to at least one through hole.

[0091] Optionally, at least N through holes on the limiting body are evenly distributed in the circumferential direction, such that the end face of the first end of any clamping pipe wall is located at at least one through hole, and each clamping pipe wall corresponds to at least one through hole; wherein, N is a positive integer, N×min(L1)≥the circumference of the nut clamping pipe>(N - 1)×min(L1), and min(L1) is the arc length of the clamping pipe wall with the smallest arc length among all the clamping pipe walls that form the nut clamping pipe.

[0092] Optionally, the limiting part is a ring structure;

[0093] Its limiting body is a ring body with a ring structure, and the central hole is a ring hole with a ring structure;

[0094] The aperture of the central hole>the inner diameter of the nut clamping pipe.

[0095] Optionally, the outer end face of the first end of the nut clamping pipe is located on the limiting body, and the inner end face is located in the central hole.

[0096] Optionally, the limiting part is formed by a plurality of convex teeth distributed along the circumferential direction on the inner wall of the nut body; its 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, and the gap is the space formed between adjacent convex teeth;

[0097] The inner diameter of the nut clamping pipe≥the aperture of the central hole.

[0098] Optionally, both the outer end face and the inner end face of the first end of the nut clamping pipe are located on the limiting body. Optionally, when the nut clamping pipe is formed by splicing a pipe structure with a pipe seam, a part of its end face is located at the gap.

[0099] Optionally, when the nut clamping pipe is formed by splicing or fitting two or more clamping pipe walls, the arc length of any gap<the arc length of any clamping pipe wall among all the clamping pipe walls that form the nut clamping pipe, such that each clamping pipe wall will have at least one convex tooth to support it.

[0100] Optionally, the arc length of any convex tooth<the arc length of any clamping pipe wall among all the clamping pipe walls that form the nut clamping pipe, such that for each clamping pipe wall, a part of its first end face is located at the gap.

[0101] Optionally, the limiting part is formed by a plurality of convex teeth distributed along the circumferential direction on the inner wall of the nut body; its 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, and the gap is the space formed between adjacent convex teeth;

[0102] The aperture of the central hole > the inner diameter of the nut pipe clamp.

[0103] Optionally, the outer end face of the first end of the nut pipe clamp is on the limit body, and the inner end face is in the central hole.

[0104] Optionally, when the nut pipe clamp is formed by splicing a pipe structure with a pipe seam, part of the end face of its first end outer end face is also at the gap.

[0105] Optionally, when the nut pipe clamp is formed by splicing or fitting two or more pipe walls of the clamp, the arc length of any gap < the arc length of any pipe wall among all the pipe walls forming the nut pipe clamp, so that each pipe wall will have at least one convex tooth to carry it.

[0106] Optionally, the arc length of the convex tooth ≥ the arc length of the pipe wall; or,

[0107] If the arc length of the convex tooth < the arc length of the pipe wall, then the pipe wall, part of the end face of its first end outer end face is also at the gap.

[0108] Optionally, the pipe length of the nut pipe clamp ≤ the maximum pipe length of the non-bulging part between the nut body sleeved on the non-bulging part and the bulging part.

[0109] Optionally, the first composite outer diameter R1 ≤ the inner diameter of the first clamping part < the second composite outer diameter R2; wherein, the first composite outer diameter R1 is the outer diameter at the non-bulging part of the externally pressed pipe, and the second composite outer diameter R2 is the maximum outer diameter at the bulging part of the externally pressed pipe;

[0110] The first clamping part clamps and presses the first pressure-bearing surface and the external pipe outside it, so as to form a seal between the first pressure-bearing surface and the external pipe.

[0111] 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 external pipe outside it through its inner edge; or,

[0112] 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 external pipe outside it through its conical curved surface inner wall.

[0113] Optionally, the outer diameter of the nut pipe clamp ≤ the aperture of the nut through-hole;

[0114] The inner diameter of the nut pipe clamp ≥ the first composite outer diameter R1, wherein the first composite outer diameter R1 is the outer diameter at the non-bulging part of the externally pressed pipe.

[0115] Optionally, when the inner diameter of the nut pipe clamp < the second composite outer diameter R2, the first clamping part can be the second end of the nut pipe clamp; wherein the second composite outer diameter R2 is the maximum outer diameter at the bulging part of the externally pressed pipe.

[0116] Optionally, the first clamping portion is a circular ring structure disposed within the nut clamping tube; the inner diameter of the circular ring structure < the second composite outer diameter R2, and the circular ring structure is disposed along the circumferential direction on the inner wall at the second end of the nut clamping tube; wherein, the second composite outer diameter R2 is the maximum outer diameter at the bulging portion pressed into the external tube. Optionally, when the outer diameter of the nut clamping tube = the aperture of the nut through-hole, the nut body tightly clamps the nut clamping tube formed by the butt joint of its inner wall, so that the nut clamping tube maintains the tube structure state;

[0117] When the outer diameter of the nut clamping tube < the aperture of the nut through-hole, a tightening structure is provided on the outer wall of the nut clamping tube, and the outer diameter of the tightening structure = the aperture of the nut through-hole, and the nut body tightly clamps the tightening structure through its inner wall, so that the nut clamping tube maintains the tube structure state.

[0118] Optionally, the tightening structure is a complete circular ring structure; or,

[0119] The tightening structure is an incomplete circular ring structure and is composed of several discontinuous circular ring segments. Optionally, the tightening structure is disposed at the second end of the nut clamping tube.

[0120] Optionally, the nut clamping tube has a first positioning structure for positioning the adjacent clamping tube walls at the adjacent position, so that the two ends of the two adjacent clamping tube walls are aligned;

[0121] The first positioning structure includes a positioning pin disposed on the side surface of one adjacent clamping tube wall and a positioning groove disposed on the side surface of the other adjacent clamping tube wall.

[0122] Optionally, at the adjacent position of the nut 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.

[0123] Optionally, the concave-convex structures are provided on each clamping tube wall;

[0124] At each adjacent position of the nut clamping tube, the concave-convex structures of the adjacent clamping tube walls are mutually engaged to form a complete tube wall at the engagement position; at the same time, the concave-convex structures of the adjacent clamping tube walls also mutually bite or interlock, so as to form a connection between the adjacent clamping tube walls and keep the nut clamping tube in the tube structure state.

[0125] Optionally, at each adjacent position of the nut clamping tube, the concave-convex structure of one adjacent clamping tube wall is a groove opened on the side surface, the groove extends along the direction of the nut clamping tube, and its extension length is equal to the tube length of the nut clamping tube; the concave-convex structure of the other adjacent clamping tube wall is a convex block disposed on the side surface, the convex block extends along the direction of the nut clamping tube, and its extension length is equal to the tube length of the nut clamping tube; or,

[0126] The concave-convex structure of another adjacent pipe wall of the nut clamping pipe is a number of protrusions arranged on the side surface. The number of protrusions is distributed along the direction of the nut clamping pipe, and there is a protrusion arranged at the second end of the nut clamping pipe. Each protrusion extends along the direction of the nut clamping pipe, and the extension length thereof is less than the pipe length of the nut clamping pipe.

[0127] Optionally, at each adjacent joint of the nut clamping pipe, the concave-convex structure of one adjacent pipe wall is a number of grooves opened on the side surface. The number of grooves is distributed along the direction of the nut clamping pipe. Each groove extends along the direction of the pipe diameter and penetrates the pipe wall.

[0128] The concave-convex structure of another adjacent pipe wall is a number of protrusions arranged on the side surface. The number of protrusions is distributed along the direction of the nut clamping pipe. Each protrusion extends along the direction of the pipe diameter, and the extension length thereof is equal to the wall thickness of the pipe wall.

[0129] Optionally, at each adjacent joint of the nut clamping pipe, the protrusions on one adjacent pipe wall are embedded into the grooves of another adjacent pipe wall.

[0130] The shape and size of the protrusion match the groove into which it is embedded, and a complete pipe wall is formed at the fitting position.

[0131] Optionally, at each adjacent joint of the nut clamping pipe, the protrusions on the side surface of one adjacent pipe wall, their number and setting positions correspond to the grooves on the side surface of another adjacent pipe wall.

[0132] Optionally, the protrusion is formed by protruding from its side surface along the circumferential direction of the pipe wall towards the outside of the pipe wall, and has a head and a tail; the part of the protrusion connected to the side surface is the tail, and the rest is the head, and at least part of the head of the protrusion is larger than its tail.

[0133] The groove is formed by recessing from its side surface along the circumferential direction of the pipe wall towards the inside of the pipe wall, and has 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.

[0134] When the protrusion is embedded into the groove, its head is located at the bottom of the groove and its tail is located at the notch of the groove. The groove catches the head of the protrusion through the notch, so that the protrusion and the groove are engaged with each other, and the adjacent pipe walls are connected at the adjacent joint.

[0135] Optionally, the groove further has a port, and the protrusion is embedded into the groove from the port of the groove. Optionally, the shapes of the protrusion 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 pipe wall as the concave-convex structure; or, protrusions are arranged on both side surfaces of the pipe wall as the concave-convex structure; or

[0136] A groove is provided on one side of the clip tube wall as the concave-convex structure, and a convex block is provided on the other side as the concave-convex structure.

[0137] Optionally, at each adjacent joint of the nut clip tube, the concave-convex structure of one adjacent clip tube wall is a groove provided on the inner wall. Taking this groove as the first groove, the first groove extends along the direction of the nut clip tube and the extension length is equal to the tube length of the nut clip tube.

[0138] The concave-convex structure of the other adjacent clip tube wall is a groove provided on the outer wall. Taking this groove as the second groove, the second groove extends along the direction of the nut clip tube and the extension length is equal to the tube length of the nut clip tube. Optionally, at each adjacent joint of the nut clip tube, the outer wall of one adjacent clip tube wall is embedded in the groove of the other adjacent clip tube wall. Among them,

[0139] The outer wall of the first groove, its shape and size match the second groove into which it is embedded, and a complete tube wall is formed at the fitting part.

[0140] The outer wall of the second groove, its shape and size match the first groove into which it is embedded, and a complete tube wall is formed at the fitting part.

[0141] Optionally, the first groove is recessed from the inner wall of the clip tube wall along the pipe diameter direction towards the outer wall, having a notch and a bottom. The first groove takes the part close to the inner wall as the notch and the rest as the bottom.

[0142] The second groove is recessed from the outer wall of the clip tube wall along the pipe diameter direction towards the inner wall, having a notch and a bottom. The second groove takes the part close to the outer wall as the notch and the rest as the bottom.

[0143] Optionally, the first groove or the second groove also has a port.

[0144] The outer wall of the first groove is embedded into the second groove from the port of the second groove.

[0145] The outer wall of the second groove is embedded into the first groove from the port of the first groove.

[0146] Optionally, the shape of each outer wall and the groove fitted with it 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.

[0147] Optionally, when the shape of each outer wall and the groove fitted with it is a rectangle, each outer wall can also be embedded into the groove from the notch.

[0148] Optionally, first grooves are formed on the inner walls on both sides of the clamping tube wall as the concave-convex structure; alternatively, second grooves are formed on the outer walls on both sides of the clamping tube wall as the concave-convex structure; alternatively, first grooves are formed on the inner walls on one side of the clamping tube wall as the concave-convex structure, and second grooves are formed on the outer walls on the other side of the clamping tube wall as the concave-convex structure.

[0149] Optionally, each clamping tube wall of the nut clamping tube itself is a mountain-shaped tube wall structure, and the mountain-shaped tube wall structure is used as the concave-convex structure, and the adjacent clamping tube walls in the nut clamping tube are arranged in opposite directions.

[0150] Optionally, each clamping tube wall has a base wall, a main wall, side walls and grooves;

[0151] 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 tube length of the nut clamping tube.

[0152] Optionally, at each adjacent joint of the nut clamping tube, the side wall of one adjacent clamping tube wall is embedded in the groove of the other adjacent clamping tube wall;

[0153] The shapes and sizes of the side walls match the grooves into which they are embedded, and a complete tube wall is formed at the fitting position.

[0154] Optionally, at each end of the nut clamping tube, the base wall of one adjacent clamping tube wall is joined with the main wall of the other adjacent clamping tube wall, and a complete tube wall is formed at the joining position;

[0155] Meanwhile, the sum of the arc lengths of the base walls and the main walls at this end is equal to the circumference of the nut clamping tube.

[0156] Another technical solution of the present invention is to provide a tube connection method, which is applicable to any one of the above-mentioned tube connection devices, and includes the following steps:

[0157] The nut body passes through the bulging part from the second end of the connecting tube and is sleeved on the non-bulging part;

[0158] The fastening bolt is sleeved on the outer tube;

[0159] Both the bulging part and the part of the non-bulging part connected thereto are pressed into the outer tube. The outer tube is in an expanded diameter state. A connection is formed between the connecting tube and the outer tube, and the fastening bolt is located on the second side of the bulging part;

[0160] The nut clamping tube is installed in the nut body to form a fastening nut; the formed fastening nut is sleeved on the non-bulging part and is located on the first side of the bulging part;

[0161] Screw the fastening nuts and fastening bolts on both sides of the bulging part tightly in a spiral manner. Apply pushing forces in opposite directions to the bulging part pressed into the outer tube through the fastening nuts and fastening bolts to fix the connection between the connecting tube and the outer tube, and at the same time form multiple seals at the connection.

[0162] Optionally, at the non-bulging part between the nut body and the bulging part, each pipe wall of the clamp surrounds the non-bulging part or the outer tube outside it and is joined together to form a nut pipe clamp, and the nut pipe clamp is inserted into the nut through-hole along the non-bulging part to form a fastening nut; or,

[0163] At the non-bulging part between the nut body and the bulging part, each pipe wall of the clamp is inserted into the nut body along the non-bulging part respectively, and is joined together in the nut through-hole to form a nut pipe clamp to form a fastening nut.

[0164] Optionally, at the non-bulging part between the nut body and the bulging part, spread the pipe seam of the nut pipe clamp, surround the non-bulging part or the outer tube outside it with the nut pipe clamp, and insert the nut pipe clamp into the nut through-hole along the non-bulging part to form a fastening nut.

[0165] Optionally, screw the fastening nut and the fastening bolt tightly to a proper tightening position.

[0166] 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 includes the following steps:

[0167] Unscrew the fastening nut and the fastening bolt in a spiral manner;

[0168] The connecting tube withdraws from the outer tube and is disassembled from the outer tube;

[0169] The fastening nut separates from the bulging part along the non-bulging part, and the nut pipe clamp or its pipe wall is taken out from the nut through-hole;

[0170] The nut body is taken off from the second end of the connecting tube through the bulging part;

[0171] Take the fastening bolt off the outer tube.

[0172] Optionally, push the nut pipe clamp out of the nut body, disassemble the adjacent pipe walls and take the nut pipe clamp off the non-bulging part; or,

[0173] Push the pipe wall out of the nut body and take it off the non-bulging part.

[0174] Optionally, push the nut pipe clamp out of the nut body, spread the pipe seam of the nut pipe clamp and take the nut pipe clamp off the non-bulging part.

[0175] Compared with the prior art, a pipe connection device, its fastening nut, and the pipe connection and disassembly methods provided by the present invention have the beneficial effects that:

[0176] (1) The present invention provides a bulging portion on the connecting pipe of the connecting body. By pressing the bulging portion into the external pipe to expand the diameter of the external pipe, 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, so that at least two connections are formed between the external pipe and the connecting body (such as the connection between the connecting body and other components, and the connection between other components and the external pipe). The series arrangement 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, high-frequency disassembly and repair, etc., 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.

[0177] (2) The present invention disassembles the fastening nut into two parts: a nut body and a nut pipe clamp, and the nut pipe clamp is formed by a splicing or fitting method. This enables the fastening nut to be disposed on the first side of the bulging portion pressed into the external pipe and to cooperate with the fastening bolt to clamp and push the bulging portion pressed into the external pipe, solving the problem that a common fastening nut cannot achieve both being placed on the first side of the bulging portion and clamping and pushing the bulging portion pressed into the external pipe at the same time.

[0178] (3) The pipe connection device provided by the present invention can form seals with the external pipe at the first pressure-bearing surface, the second pressure-bearing surface, and the third pressure-bearing surface of the bulging portion, or in other words, 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.

[0179] (4) The pipe connection device provided by the present invention has simple structures of its components, 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. Description of the Drawings

[0180] Figure 1 It is a semi-sectional and exploded view of the pipe connection device in the first embodiment of the present invention;

[0181] Figure 2 It is a semi-sectional, assembled view of the pipe connection device in the first embodiment of the present invention and its partial enlarged view;

[0182] Figure 3 It is a connection view of the connecting body and the external pipe in the first embodiment of the present invention and its partial enlarged view;

[0183] Figure 4Schematic diagram of the interaction between the bulging part, non-bulging part and external pipe in the first embodiment of the present invention;

[0184] Figure 5 Schematic diagram of the structure of the nut body in the first embodiment of the present invention;

[0185] Figure 6 Semi-sectional view of the nut body in the first embodiment of the present invention;

[0186] Figure 7 Semi-sectional view of the fastening nut and partial enlarged view of the end face of the nut clamping the pipe in the first embodiment of the present invention;

[0187] Figure 8 Schematic diagram of the state where the pipe wall is assembled to form the nut clamping the pipe in the first embodiment of the present invention;

[0188] Figure 9 Semi-sectional view of the fastening bolt in the first embodiment of the present invention;

[0189] Figure 10 Semi-sectional view of the two-way connection body in the second embodiment of the present invention;

[0190] Figure 11 Semi-sectional view of the four-way connection body in the second embodiment of the present invention;

[0191] Figure 12 Semi-sectional view of the connection body in the third embodiment of the present invention;

[0192] Figure 13 Semi-sectional view of the fastening nut and partial enlarged view of the end face of the pipe wall in the fourth embodiment of the present invention;

[0193] Figure 14 Assembly sectional view of the nut clamping the pipe in the nut body, top view of the limiting part, and top view of the limiting part bearing the nut clamping the pipe in the fifth embodiment of the present invention;

[0194] Figure 15 Schematic diagram of the positional relationship between the pipe wall and the limiting part in the fifth embodiment of the present invention;

[0195] Figure 16 Assembly diagram of the nut clamping the pipe in the nut body, top view of the limiting part, and top view of the limiting part bearing the nut body in the sixth embodiment of the present invention;

[0196] Figure 17 Assembly diagram of the pipe wall in the nut body in the sixth embodiment of the present invention;

[0197] Figure 18 Schematic diagram of the positional relationship between the pipe wall and the limiting part in the sixth embodiment of the present invention;

[0198] Figure 19 Inverted assembly diagram of the nut clamping tube in the nut body, bottom view of the limiting part, and bottom view of the limiting part bearing the nut body in the seventh embodiment of the present invention;

[0199] Figure 20 Schematic structural diagram of the nut clamping tube with a tube slit in the eighth embodiment of the present invention;

[0200] Figure 21 Schematic diagram of the state where the clamping tube walls with the same arc size are joined to form a bolt clamp in the ninth embodiment of the present invention;

[0201] Figure 22 Schematic diagram of the state where three clamping tube walls are joined to form a bolt clamp in the tenth embodiment of the present invention;

[0202] Figure 23 Schematic comparison diagram of the joined state of the clamping tube walls in the eleventh embodiment of the present invention;

[0203] Figure 24 Schematic comparison diagram of the state where the nut clamping tube clamps and presses the bulging part in the twelfth embodiment of the present invention;

[0204] Figure 25 Schematic comparison diagram of the state where the fastening bolt clamps and presses the bulging part in the twelfth embodiment of the present invention;

[0205] Figure 26 Schematic diagram of the state where the nut clamping tube clamps and presses the bulging part in the thirteenth embodiment of the present invention;

[0206] Figure 27 Schematic distribution diagram of each tightening structure in the fourteenth embodiment of the present invention;

[0207] Figure 28 Schematic assembly diagram of the nut clamping tube and the nut body in the fourteenth embodiment of the present invention;

[0208] Figure 29 Schematic diagram of the state where the clamping tube walls are joined to form a nut clamping tube in the fifteenth embodiment of the present invention;

[0209] Figure 30 Schematic diagram of the end of the nut clamping tube formed by joining in the fifteenth embodiment of the present invention;

[0210] Figure 31 Schematic structure of the clamping tube wall in the fifteenth embodiment of the present invention;

[0211] Figure 32 Schematic diagram of the state where the clamping tube walls are joined to form a nut clamping tube in the sixteenth embodiment of the present invention;

[0212] Figure 33 Schematic diagram of the outer wall of the nut clamping tube formed by joining in the sixteenth embodiment of the present invention;

[0213] Figure 34 Schematic diagram of the outer wall of the nut clamping tube formed by fitting in the seventeenth embodiment of the present invention;

[0214] Figure 35 Schematic diagram of the structure of the clamping tube wall in the seventeenth embodiment of the present invention;

[0215] Figure 36 Schematic diagram of the end of the nut clamping tube formed by fitting in the seventeenth embodiment of the present invention;

[0216] Figure 37 Schematic diagram of the state where the nut clamping tube is formed by fitting the clamping tube wall in the eighteenth embodiment of the present invention;

[0217] Figure 38 Schematic diagram of the assembly of the nut body and the fastening bolt in the nineteenth embodiment of the present invention. Detailed implementation manners

[0218] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments; the features of each embodiment can be combined or replaced with 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 fall within the scope of protection of the present invention.

[0219] Embodiment 1

[0220] As Figure 1 , 2 shown, this embodiment provides a pipe connection device 100, which includes a connection body 110, a fastening nut, and a fastening bolt 140; among them, the fastening nut further includes a nut body 120 and a nut clamping tube 130. In the pipe connection device 100, the connection body 110 is connected to the external pipe 150 to form a bulged connection part, and a fluid passage is formed by connecting the external pipe and the external pipe (or the external pipe and the device) through the connection body 110; the fastening nut and the fastening bolt 140 are respectively arranged on both sides of the connection part, and the fastening nut and the fastening bolt 140 are threadedly connected to clamp and press 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 pipe made of resin material for transporting fluids. The connection body 110 will be introduced in detail below.

[0221] 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 confluence 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 communicates 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 it is connected to. All kinds of pipe diameters mentioned in this article, including inner diameter and outer diameter, are radii.

[0222] In this embodiment, the connection body 110 is a T-shaped pipe connection structure and the diameters of the 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 structure, and the diameters of the 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 and the diameter size of the connecting pipes, nor does it limit that in other related examples, it can be designed according to the actual application situation.

[0223] Each connecting pipe includes a bulging part 112 and a non-bulging part 113; among them, the bulging part 112 is formed by the outer wall of the connecting pipe bulging outwards, and the bulging part 112 is located at the second end of the connecting pipe; the non-bulging part 113 is the part of the connecting pipe except the bulging part, and the non-bulging part 113 is located on the first side of the bulging part 112, as Figure 3 shown. In this article, one end or side of each component or part close to the connection body (or the cavity) in the assembled state is the first end or the first side, and one end or side far from the connection body (or the cavity) is the second end or the second side.

[0224] 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 part 112 and the outer diameter of the non-bulging part 113) > the inner diameter of the external pipe 150.

[0225] In the present invention, the outer diameter of the bulging part 112 > the inner diameter of the external pipe 150. Therefore, when the bulging part 112 of the connecting pipe is pressed into the external pipe 150, the bulging part 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 part 112 is in close contact with the inner wall of the external pipe 150. The bulging part 112 will exert an expansion pressure on the external pipe 150, and the external pipe 150 will exert a tightening pressure on the bulging part 112, as Figure 4 shown. There is a certain frictional force between the inner wall of the external pipe 150 and the outer wall of the bulging part 112 (or the connecting pipe), so that the external pipe 150 is connected to the connecting pipe and does not easily become loose.

[0226] Similarly, the outer diameter of the non-bulging portion 113 > the inner diameter of the outer tube 150. Therefore, when the non-bulging portion of the connecting tube is pressed into the outer tube, the non-bulging portion pressed into the outer tube will expand the outer tube 150 and make the outer tube 150 in a state of expanded diameter. The non-bulging portion pressed into the outer tube, its outer wall is in close contact with the inner wall of the outer tube 150. The non-bulging portion will exert an expansion pressure on the outer tube 150, and the outer tube 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 outer tube 150 and the outer wall of the non-bulging portion (or connecting tube).

[0227] The bulging portion 112 is located at the second end of the connecting tube (or non-bulging portion 113). Therefore, when the connecting tube is connected to the outer tube 150, only the bulging portion 112 can be pressed into the outer tube 150, or both the bulging portion 112 and the non-bulging portion connected thereto can be pressed into the outer tube 150. This is not limited herein, nor is it limited in other related examples, and can be designed according to the actual application situation. The bulging portion pressed into the outer tube makes the connecting tube (or connecting body 110) connected to the outer tube and forms a bulging connection portion.

[0228] In this embodiment, both the bulging portion 112 and the non-bulging portion connected thereto are 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 outer wall of the non-bulging portion pressed into the outer tube 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.

[0229] In this embodiment, the outer wall of the bulging portion 112 can be divided into a first bearing surface 112a, a second bearing surface 112b, and a third bearing surface 112c. As Figure 3 shown; among them, the first bearing surface 112a is located on the first side of the bulging portion, and under the pushing force of the fastening nut, it can form a seal I with the outer tube. As Figure 2 shown; the second bearing surface 112b is located on the second side of the bulging portion, and under the pushing force of the fastening bolt, it can form a seal II with the outer tube; the third bearing surface 112c is located between the first bearing surface 112a and the second bearing surface 112b, connecting the first bearing surface 112a and the second bearing surface 112b, and it can form a seal III with the outer tube.

[0230] Both the first bearing surface 112a and the second bearing surface 112b are conical curved surfaces, and their outer diameters are gradually changing. Specifically, in the direction along the connecting pipe and pointing to its second end, the outer diameter of the first bearing surface 112a starts from the outer diameter r of the non-bulging part, gradually increases until the maximum outer diameter R of the bulging part, and the outer diameter of the second bearing surface 112b starts from the maximum outer diameter R of the bulging part and gradually decreases, but is greater than the inner diameter of the connecting pipe; among them, the maximum outer diameter R of the bulging part > the outer diameter r of the non-bulging part, as Figure 3 shown.

[0231] The third bearing surface 112c is a cylindrical curved surface, and the outer diameter of the third bearing surface 112c remains unchanged in the direction along the connecting pipe; the outer diameter of the third 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 bearing surface 112c, the expansion pressure on the outer pipe 150 is the largest, and the tightening pressure from the outer pipe it receives is also the largest. The fit between the outer pipe 150 and the third bearing surface 112c is the tightest. Therefore, a seal III can be formed between the third bearing surface 112c and the outer pipe. In this embodiment, the bulging part 112 can form seals with the outer pipe 150 at the first bearing surface 112a, the second bearing surface 112b, and the third bearing surface 112c respectively. Or rather, a triple seal can be formed at the connection between 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 bearing surface 112a and the second bearing surface 112b will be described in detail in the subsequent text.

[0232] In the present invention, the value of the maximum outer diameter R of the bulging part can be designed according to the inner diameter size 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 bearing surface and the outer pipe. In addition, the degree of deformation damage to the outer pipe should be controlled at a relatively low level.

[0233] The bulging portion 112 is provided 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, the second end port of the bulging portion 112, specifically the second end port of the bulging portion 112 (or the second pressure-bearing surface 112b), is first pressed into the external pipe 150. To prevent the port from undergoing shrinkage deformation, separating from the inner wall of the external pipe, or obstructing fluid flow under the impact of the oncoming fluid in the external pipe 150, the end surface 112d of this port is designed as a conical curved surface in the direction along the connecting pipe and pointing towards its second end, and the inner diameter of the port shows an increasing trend. In this way, at the second end port of the bulging portion, the inner diameter of the pipe becomes larger and the flow rate slows down, weakening the impact force of the fluid. More importantly, the end surface 112d of the conical curved surface has a certain inclination, and the impact force of the oncoming fluid will push and press the end surface 112d, causing the end surface 112d to expand outwards and the second pressure-bearing surface 112b to closely adhere to the inner wall of the external pipe, without the occurrence of port shrinkage deformation, separation from the inner wall of the external pipe, or obstruction of fluid flow.

[0234] The connection between the above-mentioned connecting pipe and the external pipe entirely relies on the friction force between the two to maintain, and this 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. To make the connection between the connecting pipe and the external pipe firm and stable, the present invention respectively provides a fastening nut and a fastening bolt on both sides of the bulging portion pressed into the external pipe. When the fastening nut and the fastening bolt are screwed tightly, they will respectively clamp and push and press the bulging portion pressed into the external pipe from both sides of the bulging portion (or the connection point), and the bulging portion and the external pipe on its outer layer are firmly pressed together and cannot slip off from the fastening nut or the fastening bolt, 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 also formed at the connection between the connecting pipe and the external pipe, ensuring the high efficiency and stability of the seal.

[0235] In the present invention, a pair of fastening nuts and fastening bolts (that is, one fastening nut and one matching fastening bolt) need to be provided at the connection between each connecting pipe and the external pipe or at the bulging portion pressed into the external pipe to clamp and push and press the bulging portion pressed into the external pipe and fix the connection between the connecting pipe and the external pipe. Therefore, the number of fastening nuts and fastening bolts equipped in the pipe connection device can be determined according to the number of connecting pipes or bulging portions. In this embodiment, the connection body 110 has three connecting pipes (or three bulging portions 112). Therefore, the pipe connection device 100 can be configured with three pairs of fastening nuts and fastening bolts (for simplicity of the drawing, Figure 1 、 2 only the situation where a fastening nut and a fastening bolt are provided at one connection point or bulging portion is shown, and the settings at other connection points or bulging portions are not shown). The fastening nut will be introduced in detail below.

[0236] In the present invention, a fastening nut is sleeved on the connecting pipe. Specifically, it is sleeved on the non-bulging part, and the fastening nut is placed on the first side of the bulging part. Each fastening nut further includes a nut body and a nut pipe clamp.

[0237] As Figure 5 and Figure 6 shown, a nut through hole 123 is formed inside the nut body 120; the nut through hole 123 is arranged along the direction of the fastening nut and penetrates the nut body 120; the aperture of the nut through hole 123 > the maximum outer diameter R of the bulging part, so that the nut body 120 can pass through the bulging part 112 from the second end of the connecting pipe and be sleeved on the non-bulging part 113, placing the nut body 120 on the first side of the bulging part 112. A thread structure is provided on the inner wall of the nut body 120, and this thread structure is located at the second end of the nut body for mating with the thread structure of the fastening bolt for threaded connection. Anti-slip edges can also be provided on the outer wall of the nut body 120 to facilitate personnel to operate and hold or cooperate with auxiliary tools for screwing operations.

[0238] The nut body 120 also has a limiting part 124. The limiting part 124 is located inside the nut body 120 (or the nut through hole 123) and on the first side of its thread structure. The limiting part 124 is used to carry the nut pipe clamp. In the present invention, the limiting part at least has a limiting body and a central hole; among them, the limiting body is arranged along the circumferential direction on the inner wall of the nut body (or the hole wall of the nut through hole), and at least the outer diameter of the nut pipe clamp > the aperture of the central hole, so that the limiting part can carry the nut pipe clamp 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 nut through hole, and the aperture of the central hole > the maximum outer diameter R of the bulging part, so that the nut body 120 can pass through the bulging part 112 from the second end of the connecting pipe and be sleeved on the non-bulging part 113, placing the nut body 120 on the first side of the bulging part 112.

[0239] As Figure 6 and Figure 7 shown, in this embodiment, the limiting part 124 is a ring structure, the limiting body 124a is a ring body of the ring structure, and the central hole 124b is a ring hole of the ring structure. The outer diameter of the nut pipe clamp 130 > the inner diameter of the nut pipe clamp 130 ≥ the aperture of the central hole 124b. In this embodiment, the limiting part 124 (or the limiting body 124a) is arranged on the inner wall of the first end of the nut body 120; setting the limiting part at the first end of the nut body has the effect of blocking larger impurities and foreign objects from entering the nut through hole, and the overall structure of the nut body is beautiful and easy to demold and manufacture. In the present invention, the limiting part 124 and the nut body 120 can be integrally formed.

[0240] In the present invention, the aperture diameter of the nut through-hole > the aperture diameter of the central hole > the maximum outer diameter R of the bulging portion. In this way, the nut body 120 can pass through the second end of the connecting pipe, pass through the bulging portion 112, and be sleeved on the non-bulging portion 113, so that the nut body 120 is placed on the first side of the bulging portion 112. However, this also means that the nut body 120 itself does not have the ability to clamp and push the bulging portion 112. In the present invention, a nut clamping pipe is used to achieve the clamping and pushing effects on the bulging portion and the outer pipe outside it.

[0241] In the present invention, the nut clamping pipe is a pipe structure formed by splicing or fitting. It can surround the connecting pipe, more precisely, surround the non-bulging portion or the outer pipe outside it to form a pipe structure by splicing or fitting. In this way, the nut clamping pipe can be directly arranged on the first side of the bulging portion, without the need to pass through the second end of the connecting pipe, pass through the bulging portion, and be sleeved on the non-bulging portion 113. The nut clamping pipe has a first clamping portion. The nut clamping pipe clamps and pushes the bulging portion pressed into the outer pipe through the first clamping portion. The first clamping portion is a circular ring structure.

[0242] In the present invention, the aperture diameter of the central hole < the outer diameter of the nut clamping pipe ≤ the aperture diameter of the nut through-hole. The outer diameter of the nut clamping pipe ≤ the aperture diameter of the nut through-hole, so that the nut clamping pipe or its clamping wall can be inserted into the nut through-hole 123 (or the nut body 120); the outer diameter of the nut clamping pipe > the aperture diameter of the central hole, so that the nut clamping pipe or its clamping wall inserted into the nut through-hole 123 (or the nut body 120) reaches the limiting body 124a, and at least the outer end face of its first end can be placed on the limiting body. The limiting body bears the nut clamping pipe and blocks the movement of the nut clamping pipe. The limiting portion limits and supports the nut clamping pipe through the limiting body.

[0243] In the present invention, the first composite outer diameter R1 ≤ the inner diameter of the first clamping portion < the second composite outer diameter R2, where the first composite outer diameter R1 is the outer diameter at the non-bulging portion pressed into the outer pipe, that is, the first composite outer diameter R1 = the outer diameter r of the non-bulging portion + the wall thickness d of the outer pipe, as Figure 3 shown; the second composite outer diameter R2 is the outer diameter at the maximum of the bulging portion pressed into the outer pipe, that is, the second composite outer diameter R2 = the maximum outer diameter R of the bulging portion + the wall thickness d of the outer pipe. The second composite outer diameter R2 > the first composite outer diameter R1. The inner diameter of the first clamping portion ≥ the first composite outer diameter R1, so that the nut clamping pipe or its pipe wall can directly form a pipe structure by splicing or fitting around the non-bulging portion 113 or the outer pipe 150 outside it on the first side of the bulging portion 112; the inner diameter of the first clamping portion < the second composite outer diameter R2, so that the nut clamping pipe is located on the first side of the bulging portion and cannot pass through the bulging portion 112 pressed into the outer pipe. The nut clamping pipe can clamp and push the bulging portion pressed into the outer pipe through the first clamping portion.

[0244] In this embodiment, the nut clamp tube 130 is a tube structure formed by two clamp tube walls 131 and 132. The outer diameter of the nut clamp tube 130 = the aperture of the nut through hole 123, the inner diameter of the nut clamp tube 130 ≥ the aperture of the center hole 124b, and the inner diameter of the nut clamp tube 130 = the first composite outer diameter R1.

[0245] The outer diameter of the nut clamp tube 130 (also the outer diameter of the clamp tube walls 131, 132) = the aperture of the nut through hole 123, so the clamp tube walls 131, 132 can be inserted into the nut through hole 123, and the outer walls of the clamp tube walls 131, 132 are tightly fitted with the inner wall of the nut body 120 (i.e., the hole wall of the nut through hole), such as Figure 7 As shown, the nut body 120 can clamp the assembled nut clamp tube 130 through its inner wall (or the nut through hole 123 can clamp the assembled nut 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.

[0246] The outer diameter of the nut clamp tube 130> the inner diameter of the nut clamp tube 130≥ the aperture of the center hole 124b, so the nut clamp tube 130 or its clamp tube wall in the nut through hole 123 (or the nut body 120) reaches the limit body 124a, and the entire end surface of its 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 nut clamping tube; the space between the second end of the nut clamping tube and the threaded structure of the nut body is used to accommodate the bulging portion pressed into the external tube.

[0247] The inner diameter of the nut 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, surrounding the non-bulging portion 113 or the outer layer of the external tube 150 to form a tube structure, and the formed nut clamp tube 130 itself cannot be pressed into the bulging portion 112 of the external tube, and the nut 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 nut clamp tube is used as the first clamping portion 133, and the second end of the nut 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 nut clamp tube 130 has a simple structure and is easy to manufacture.

[0248] At the non-bulging part between the nut body (sleeved on the non-bulging part 113) and the bulging part, at the non-bulging part, the clamping pipe walls 131, 132 surround the non-bulging part 113 or the outer pipe 150 of its outer layer and are joined together to form the nut clamping pipe 130, and are inserted into the nut body 120 along the non-bulging part 113 to form a fastening nut; or, at the non-bulging part between the nut body (sleeved on the non-bulging part 113) and the bulging part, the clamping pipe walls 131, 132 are respectively inserted into the nut body 120 along the non-bulging part 113 and are joined together in the nut through-hole 123 to form the nut clamping pipe 130 to form a fastening nut. The formed fastening nut 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.

[0249] At the non-bulging part between the nut body (sleeved on the non-bulging part 113) and the bulging part, the nut clamping pipe or its clamping pipe walls are inserted into the nut through-hole, which means that the pipe length of the nut clamping pipe or its clamping pipe walls ≤ the maximum pipe length of the non-bulging part between the nut body (sleeved on the non-bulging part) and the bulging part, so that the non-bulging part has enough space to accommodate the nut clamping pipe or each clamping pipe wall and insert it (from the second end of the nut body) into the nut through-hole.

[0250] In the present invention, each clamping pipe wall of the nut 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, 132 are different. Among them, the clamping pipe wall 131 is a pipe wall with a 1 / 3 arc (corresponding central angle of 240°), and the clamping pipe wall 132 is a pipe wall with a 2 / 3 arc (corresponding central angle of 120°). The clamping pipe walls 131, 132 can just form a pipe structure (i.e., the nut clamping pipe 130) when joined together, as Figure 8 shown. It should be noted that in this embodiment, the two clamping pipe walls 131, 132 can also be pipe walls with 1 / 4 arc and 3 / 4 arc respectively, or can also be pipe walls with 2 / 5 arc and 3 / 5 arc respectively. In this embodiment, the arc sizes of each clamping pipe wall of the nut clamping pipe are not limited, nor are they limited in other related examples, and can be designed according to actual application situations, as long as each clamping pipe wall can just form a pipe structure (nut clamping pipe) together.

[0251] In this embodiment, the clamping pipe wall 131 has two side surfaces 131a, 131b, and the clamping pipe wall 132 has two side surfaces 132a, 132b; the nut clamping pipe 130 formed by joining the clamping pipe wall 131 and the clamping pipe wall 132 has two adjacent joints, where one adjacent joint side surface 131a is closely joined with the side surface 132a, and the other adjacent joint side surface 131b is closely joined with the side surface 132b (or one adjacent joint side surface 131a is closely joined with the side surface 132b, and the other adjacent joint side surface 131b is closely joined with the side surface 132a). The fastening bolt will be introduced in detail below.

[0252] In the present invention, the fastening bolt 140 is sleeved on the outer tube 150, and the fastening bolt 140 is placed on the second side of the bulging portion. Each fastening bolt 140 has a bolt rod 141, a bolt head 142, and a bolt through-hole 144, as Figure 9 shown. The outer wall of the bolt rod 141 is provided with a thread structure, which is located at the first end of the bolt rod and is used to cooperate with the fastening nut for threaded connection. The bolt head 122 is located at the second end of the bolt rod. In this embodiment, the bolt head 122 can be designed as a polygon to facilitate the operation and gripping by personnel or to cooperate with auxiliary tools for screwing operations. In the present invention, the bolt rod, the bolt head, and the bolt through-hole of the fastening bolt can be integrally formed.

[0253] The inner diameter of the bolt through-hole 144 ≥ the outer diameter of the outer tube 150, so that the outer tube 150 can pass through the fastening bolt 140, and the fastening bolt 140 can be sleeved on the outer tube 150.

[0254] The inner diameter of the bolt through-hole 144 < the second composite outer diameter R2, and the second composite outer diameter R2 is the outer diameter at the maximum of the bulging portion pressed into the outer tube, that is, the second composite outer diameter R2 = the maximum outer diameter R of the bulging portion + the wall thickness d of the outer tube; thus, when the outer tube 150 is connected to the connecting tube, the fastening bolt 140 (sleeved on the outer tube) is located on the second side of the bulging portion 112 and itself cannot pass through the bulging portion 112 pressed into the outer tube. The fastening bolt 140 can clamp and push the bulging portion pressed into the outer tube through its first end close to the bulging portion. Therefore, in the present invention, the first end of the fastening bolt is used as the second clamping portion 141, the inner diameter of the second clamping portion 141 is the inner diameter of the bolt through-hole 144, the outer diameter of the outer tube 150 ≤ the second clamping portion 141 < the second composite outer diameter R2, and the second clamping portion 141 can be regarded as an annular structure, and its inner wall is a tubular curved surface or a cylindrical curved surface.

[0255] 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 nut sleeved on the non-bulging portion 113 and the fastening bolt 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 nut clamping tube), specifically the inner edge 133o of the first clamping portion, will be stuck on the first bearing surface 112a of the bulging portion, so that the fastening nut (or the nut clamping tube 130) cannot pass through the bulging portion 112, and the bulging portion cannot slip out from the fastening nut. The fastening nut clamps and presses the bulging portion pressed into the outer tube through the inner edge 133o. Here, the outer tube 150 and the first bearing surface 112a are tightly pressed together and fit tightly with each other, so as to form a seal I between the first bearing surface 112a and the outer tube; on the second side of the bulging portion 112, the second clamping portion 141 (or the first end of the fastening bolt), specifically the inner edge 141o of the second clamping portion, will be stuck on the second bearing surface 112b of the bulging portion, so that the fastening bolt 140 cannot pass through the bulging portion 112, and the bulging portion cannot slip out from the fastening bolt. The fastening bolt 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 bearing surface 112b are tightly pressed together and fit tightly with each other, so as to form a seal II between the second bearing surface 112b and the outer tube.

[0256] The fastening nut and the fastening bolt 140 on both sides of the bulging portion are screwed tightly, applying pushing 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.

[0257] 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 in other related examples, and can be selected according to the actual application situation.

[0258] For example, the connection body 110, fastening nut (including nut body 120 and nut clamping tube 130), fastening bolt 140, and external tube 150 can be made of any one or more synthetic resins such as PFA (tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, also known as perfluoroalkylate, 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.

[0259] In this embodiment, the connection method between the tube connection device 100 and the external tube 150 includes the following steps:

[0260] The nut body 120 is sleeved on the non-bulging portion 113 from the second end of the connecting tube through the bulging portion 112.

[0261] The fastening bolt 140 is sleeved on the external tube 150.

[0262] 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 bolt 140 is located on the second side of the bulging portion 112.

[0263] At the non-bulging portion between the nut 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 nut clamping tube 130, and the nut clamping tube 130 is inserted into the nut through-hole 123 along the non-bulging portion 113 to form a fastening nut; or, at the non-bulging portion between the nut body 120 and the bulging portion 112, the clamping tube walls 131, 132 are respectively inserted into the nut body 120 along the non-bulging portion 113 and are joined in the nut through-hole 123 to form the nut clamping tube 130 to form a fastening nut; the formed fastening nut is sleeved on the non-bulging portion 113 and is located on the first side of the bulging portion 112.

[0264] Screw the fastening nuts and fastening bolts 140 on both sides of the bulging part tightly, and apply pressing 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 nuts and fastening bolts, 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;

[0265] The operation sequence of the above steps can be appropriately adjusted without affecting other steps;

[0266] Repeat the above operations to connect and fix other connecting pipes to the outer pipe.

[0267] In this embodiment, the disassembly method between the pipe connection device 100 and the outer pipe 150 includes the following steps:

[0268] Unscrew the fastening nuts and fastening bolts 140;

[0269] The connecting pipe exits the outer pipe 150 and is disassembled from the outer pipe 150;

[0270] The fastening nut separates from the non-bulging part and the bulging part 112, and the nut clamping pipe 130 or its clamping pipe walls 131, 132 are taken out from the nut through hole 123 (or the nut body 120);

[0271] The nut body 120 is taken off from the second end of the connecting pipe through the bulging part 112;

[0272] Take the fastening bolt 140 off the outer pipe 150;

[0273] The operation sequence of the above steps can be appropriately adjusted without affecting other steps;

[0274] Repeat the above operations to disassemble and separate other connecting pipes from the outer pipe.

[0275] In the present invention, by arranging a nut clamping pipe formed by splicing in the nut body, the fastening nut 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 nuts and fastening bolts on both sides of the bulging part are screwed tightly, 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.

[0276] Embodiment 2

[0277] For the above-mentioned first embodiment, the connection body 110 is a three-way 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 nuts and fastening bolts.

[0278] 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 nuts and fastening bolts.

[0279] 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 body part in the middle of the connection body 210 can be regarded as its cavity. A pair of fastening nuts and fastening bolts 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 nuts and fastening bolts. It should be noted that in this embodiment, the connection body 210 can also be a right-angle or any other angle 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 in other related examples, which can be designed according to the actual application situation.

[0280] The connection body 210 can realize functions such as connection and turning between two fluid pipelines, meeting the requirements of different spatial pipe layouts. In the second embodiment, for the structures and materials of the fastening nuts (including nut body and nut pipe clamp), fastening bolts, and external pipes, etc., reference can be made to the first embodiment, which will not be elaborated here.

[0281] According to the above deformation method, further expansion can be made as follows:

[0282] As Figure 11 shown, the connection body 210 is a four-way pipe connection structure, which can realize functions such as connection, turning, shunting 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 nuts and fastening bolts 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 nuts and fastening bolts.

[0283] 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, for the structure and material of the fastening nut (including the nut body and the nut pipe clamp), the fastening bolt, the external pipe, etc., reference can be made to Embodiment 1, and details will not be elaborated here.

[0284] 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.

[0285] 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.

[0286] Embodiment 3

[0287] For the above-mentioned Embodiment 1, the bulging part 112 has a first bearing surface 112a, a second bearing surface 112b, and a third bearing surface 112c.

[0288] The main difference from Embodiment 1 is that in this Embodiment 3, the bulging part 312 has a first bearing surface 312a and a second bearing surface 312b.

[0289] 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 bearing surface 312a and a second bearing surface 312b, and does not have a third bearing surface. The maximum outer diameter of the first bearing surface 312a and the second bearing surface 312b is the maximum outer diameter R of the bulging part. The maximum outer diameter of the first bearing surface 312a (or the second bearing surface 312b) replaces the third bearing surface in Embodiment 1 to form a sealing part III with the external pipe 150.

[0290] 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 sealing part I is formed between the first bearing surface 312a and the external pipe, and a sealing part II is formed between the second bearing surface 312b and the external pipe. For details, reference can be made to Embodiment 1. In this Embodiment 3, for the structure and material of the fastening nut (including the nut body and the nut pipe clamp), the fastening bolt, the external pipe, etc., reference can be made to Embodiment 1, and details will not be elaborated here.

[0291] Embodiment 4

[0292] For the first embodiment described above, the outer diameter of the nut clamping tube > the inner diameter of the nut clamping tube ≥ the aperture of the central hole 124b, and the entire end face of the first end of the nut clamping tube (or its outer end face 130w and inner end face 130n) is located on the limiting body 124a.

[0293] The main difference from the first embodiment is that in the fourth embodiment, the outer diameter of the nut clamping tube > the aperture of the central hole > the inner diameter of the nut clamping tube, and the outer end face 430w of the first end of the nut clamping tube is located on the limiting body 424a.

[0294] In the first embodiment, (the outer diameter of the nut clamping tube >) the inner diameter of the nut clamping tube ≥ the aperture of the central hole. Then, for the nut clamping tube or the tube wall inserted into the nut 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 nut clamping tube and limits and supports the nut clamping tube by bearing the entire end face of the first end of the nut clamping tube. However, in the first embodiment, the end face of the nut clamping tube or the tube wall cannot be directly contacted from the first end of the nut body, and the nut clamping tube or the tube wall cannot be pushed.

[0295] In this embodiment, the outer diameter of the nut clamping tube > the aperture of the central hole > the inner diameter of the nut clamping tube. Then, for the nut clamping tube 430 or the tube wall inserted into the nut through-hole, the outer end face 430w of its first end is located on the limiting body 424a, and the inner end face 430n of its first end is located in the central hole 424b, as Figure 13 shown. The limiting body 424a blocks the movement of the nut clamping tube and limits and supports the nut clamping tube by bearing the outer end face 430w of the first end of the nut clamping tube. Its inner end face 430n is located in the central hole 424b. In this way, the end face of the nut clamping tube 430 or each tube wall can be directly contacted from the first end of the nut 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 nut body from the first end of the nut body, push the nut clamping tube 430 or each tube wall, and push the nut clamping tube 430 or each tube wall out from the second end of the nut body (or the nut through-hole), realizing the rapid removal of the nut clamping tube 430 or the tube wall from the nut body (or the nut 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 nut through-hole, reach and push the nut clamping tube or its tube wall.

[0296] In this embodiment, the outer diameter of the nut clamping tube > the diameter of the central hole > the inner diameter of the nut clamping tube, so that while the limiting part realizes the bearing and limiting of the nut clamping tube, it also enables the nut clamping tube 430 or its clamping tube wall to be quickly taken out from the nut body (or nut through-hole), which is of great significance for the disassembly and maintenance work during the use of the device. In the fourth embodiment, the structures and materials of the connecting body, fastening bolts, and external tubes can all refer to the first embodiment and will not be elaborated here.

[0297] Embodiment Five

[0298] 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.

[0299] 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, where the through holes 524c are opened on the limiting body 524a (or the ring body of the circular ring structure) (for reference, see Figure 14 in (2)); the nut 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 (for reference, see Figure 14 in (3)).

[0300] In the first embodiment, for the nut clamping tube or each clamping tube wall inserted into the nut 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 nut clamping tube and limits and supports the nut clamping tube by bearing the entire end face of the first end of the nut clamping tube; however, in the first embodiment, the end face of the nut clamping tube or the clamping tube wall cannot be directly contacted from the first end of the nut body, and the nut clamping tube or the clamping tube wall cannot be pushed.

[0301] In this embodiment, for the nut clamping tube or each clamping tube wall inserted into the nut 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 nut clamping tube and limits and supports the nut clamping tube by bearing the end face of the first end of the nut clamping tube (for reference, see Figure 14 in (1)); at the same time, part of the end face of the nut clamping tube or each clamping tube wall is at at least one through hole 524c (for reference, see Figure 14 in (3)), so that when the pushing tool enters the nut body 520 from the first end of the nut body, it can directly push the nut clamping tube 530 or the clamping tube wall from the corresponding through hole 524c.

[0302] In the present invention, the nut 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 nut clamping tube corresponds to at least one through hole and has a part of its end face at the corresponding through hole. For a nut 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. Each clamping tube wall corresponds to at least one through hole and has a part of its end face at the corresponding through hole. In this way, the pushing tool can push the nut clamping tube or each clamping tube wall from the corresponding through hole, and push the nut clamping tube or each clamping tube wall out from the second end of the nut body (or nut through hole), realizing the rapid removal of the nut clamping tube or clamping tube wall from the nut body (or nut 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 nut through hole, reach and push the nut clamping tube or its clamping tube wall.

[0303] In this embodiment, the nut 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 through holes are opened on the limiting body, the following two situations may occur in the distribution of the through holes:

[0304] 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.

[0305] 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 nut 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 nut 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 above cases (1) and (2)), when the pushing tool enters the nut body 520 from the first end of the nut 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 nut body (or the nut through hole), and the meaning of opening the through hole is lost.

[0306] In the above situation 1, in order to avoid the situation where there is a clip pipe wall that does not correspond to any through hole, it is possible to pre-set marks at visible positions such as the outer wall or end of the nut body according to the distribution of the through holes, and specify the adjacent positions of each adjacent pipe wall (reference can be made to Figure 15 the position indicated by the arrow in (3) in [reference document]), so that at least one through hole is opened in the limiting body area D between any two adjacent marks, and the clip pipe wall located in the limiting body area D corresponds to at least one through hole.

[0307] Second, the arc length < between any two adjacent through holes on the limiting body (or the ring body of the ring structure) is less than the arc length of any clip pipe wall among all the clip pipe walls forming the nut clip pipe.

[0308] 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 be realized, which is less than the arc length of any clip pipe wall among all the clip pipe walls forming the nut clip pipe; where N is a positive integer, and can be estimated according to the formula N×min(L1)≥the circumference of the nut clip pipe >(N - 1)×min(L1), where the circumference of the nut 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 nut clip pipe.

[0309] 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 is less than the arc length min(L1) of the clip pipe wall with the smallest arc length (reference can be made to Figure 15 (4) in [reference document]), 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 nut clip pipe, and thus 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 nut clip pipe can be realized.

[0310] In this embodiment, the nut pipe clamp 530 is formed by splicing a pipe clamp wall 531 (a 1 / 3 arc) and a pipe clamp wall 532 (a 2 / 3 arc); the arc length of the pipe clamp wall 531 < the arc length of the pipe clamp wall 532, and the arc length L1 of the pipe clamp wall 531 is the arc length min(L1) of the smallest pipe clamp wall among all the pipe clamp walls forming the nut pipe clamp; it can be seen from the above estimation formula 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 Figure (4) in

[0311] Embodiment Six

[0312] For the above Embodiment One, the limiting part 124 is a ring structure, having a limiting body 124a and a central hole 124b. Among them, the limiting body 124a is a ring body of the ring structure, and the central hole 124b is a ring hole of the ring structure.

[0313] The main difference from Embodiment One 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 nut body 620 (or the hole wall of the nut 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 Figure (2) in

[0314] Similar to the first embodiment, in the sixth embodiment, the outer diameter of the nut clamping tube > the inner diameter of the nut clamping tube ≥ the aperture of the central hole 624b. When the nut clamping tube 630 or the tube wall is inserted into the nut 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) in the figure. The limiting body 624a (or the convex teeth) blocks the movement of the nut clamping tube by bearing the inner and outer end faces of the nut clamping tube, and limits and supports the nut clamping tube.

[0315] When the nut clamping tube 630 in this embodiment is a tube structure with a tube seam, rather than formed by splicing or fitting multiple tube walls (reference can be made to Figure 16 shown in (1) in 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 first end of the nut clamping tube is at the central hole 624b, but part of the end face is at the gap 624c (reference can be made to the position indicated by the arrow in (3) in the figure of Figure 16 the figure). Therefore, the pushing tool can push the nut clamping tube 630 from the gap 624c, and push the nut clamping tube 630 out from the second end of the nut body 620 (or the nut through-hole), realizing the rapid removal of the nut clamping tube 630 from the nut body (or the nut through-hole), which provides convenience for the disassembly and maintenance work of the device.

[0316] As can be seen from the above, when the nut clamping tube is a tube structure with a tube seam, and the outer diameter of the nut clamping tube > the inner diameter of the nut clamping tube ≥ the aperture of the central hole, regardless of the arc length of the convex teeth and the gap, the limiting part can carry the nut clamping tube and the nut clamping tube can be quickly removed from the nut body.

[0317] When the nut clamping tube 630 in this embodiment is formed by splicing or fitting multiple tube walls (reference can be made to Figure 17 shown in 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), if the arc length of the gap ≥ the arc length of at least one of all the tube walls forming the nut clamping tube, for example, the arc length L3 of the gap ≥ the arc length L1 of the tube wall 631 (reference can be made to Figure 18 shown in (1) in the figure); the operator cannot understand the distribution position of the internal convex teeth through the nut body. In this way, during the process of installing the tube wall or the nut clamping tube into the nut through-hole, it may occur that there is a tube wall (especially the tube wall with a smaller arc length, such as the 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 tube wall slips out from the gap, and there is no convex tooth to carry the tube wall, limit and support it, so it is impossible to support the nut clamping tube to clamp and push the bulging part of the externally inserted tube, and it is impossible to clamp and fix the connection between the connecting tube and the externally inserted tube.

[0318] In order 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 nut 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 nut 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 nut clamping tube; in this way, when any clamping tube wall is inserted into the nut 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 carry it.

[0319] As can be seen from the above, when the nut clamping tube is formed by splicing or fitting multiple clamping tube walls, and the outer diameter of the nut clamping tube > the inner diameter of the nut 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 nut clamping tube, regardless of the arc length of the convex teeth, the limiting part can carry the nut clamping tube. For the material and structure of the connection body, fastening bolt, and external tube in this embodiment, reference can be made to Embodiment 1, which will not be elaborated here.

[0320] As a further expansion of Embodiment 6, as follows:

[0321] In the above Embodiment 6, when the nut clamping tube is formed by splicing or fitting multiple clamping tube walls, and the outer diameter of the nut clamping tube > the inner diameter of the nut 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 nut clamping tube, the limiting part can carry each clamping tube wall.

[0322] In the above Embodiment 6, no end face of the first end of the nut clamping tube is at the central hole 624b, and only part of the end face is at the gap 624c. The pushing tool can only push the nut clamping tube or its clamping tube wall from the gap; for each clamping tube wall forming the nut clamping tube by splicing or fitting, if the arc length of the convex tooth ≥ the arc length of at least one of the clamping tube walls among all the clamping tube walls forming the nut clamping tube, such as the arc length L4 of the convex tooth ≥ the arc length L1 of the clamping tube wall 631 (reference can be made to Figure 18In (3)); the operator cannot see through the nut body to understand the distribution position of the internal convex teeth. During the process of inserting the clip tube wall or the nut clip tube into the nut through-hole, it may occur that the clip tube wall (especially the clip tube wall with a smaller arc length, such as the clip tube wall 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; when the pushing tool enters the nut body from the first end of the nut body, it cannot directly contact the end face of the clip tube wall through the central hole or any gap to push the clip tube wall, and thus cannot push the clip tube wall out from the second end of the nut body (or the nut through-hole).

[0323] To avoid the situation where the clip tube wall 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 clip tube wall among all the clip tube walls forming the nut clip tube, the arc length of the largest convex tooth is designed, and the arc length of the designed largest convex tooth < the arc length min(L1) of the smallest clip tube wall among all the clip tube walls forming the nut clip tube (refer to Figure 18 Figure (4) in which the arc length L4 of the largest convex tooth < the arc length L1 of the smallest clip tube wall 631), so as to achieve that the arc length of any convex tooth < the arc length of any clip tube wall among all the clip tube walls forming the nut clip tube; when any clip tube wall is inserted into the nut through-hole, since the arc length of the clip tube wall itself is greater than the arc length of any convex tooth, part of the end face of the first end of each clip tube wall will be at the gap, and the pushing tool can directly contact the end face of the clip tube wall from this gap to push the clip tube wall and push the clip tube wall out from the second end of the nut body (or the nut through-hole).

[0324] As can be seen from the above, when the nut clip tube is formed by splicing or fitting multiple clip tube walls, and the outer diameter of the nut clip tube > the inner diameter of the nut clip tube ≥ 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 clip tube wall among all the clip tube walls forming the nut clip tube, the limiting part can carry the nut clip tube and the nut clip tube can be quickly taken out from the nut body.

[0325] Embodiment Seven

[0326] For the above Embodiment Four, the limiting part 124 is a ring structure, having a limiting body 124a and a central hole 124b. Among them, the limiting body 124a is a ring body of a ring structure, and the central hole 124b is a ring hole of a ring structure.

[0327] 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 nut body 720 (or the wall of the nut through-hole). The limiting part 724 has a limiting body 724a, a central hole 724b, and a gap 724c (refer 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.

[0328] Similar to Embodiment 4, in Embodiment 7, the outer diameter of the nut clamping tube > the aperture of the central hole 724b > the inner diameter of the nut clamping tube. When the nut clamping tube 730 or the clamping tube wall is inserted into the nut through-hole and reaches the limiting body 724a (or convex teeth), the outer layer end face 730w at its first end is on the limiting body 724a, while the inner layer end face 730n is in the central hole 724b, as shown in Figure 19 In (3). The limiting body 724a (or convex teeth) blocks the movement of the nut clamping tube and limits and supports the nut clamping tube by bearing the outer layer end face 730w at the first end of the nut clamping tube; its inner layer end face 730n is in the central hole 724b, so that when the pushing tool enters the nut body from the first end of the nut body, it can directly extend to the end face of the nut clamping tube or each clamping tube wall at the central hole 724b, and push the nut clamping tube or each clamping tube wall out from the second end of the nut body (or nut through-hole), realizing the quick removal of each clamping tube wall from the nut body (or nut through-hole).

[0329] When the nut clamping tube 730 in this embodiment is a tube body structure with a tube seam, rather than formed by splicing or fitting multiple clamping tube walls: the inner layer end face 730n at the first end of the nut clamping tube is in the central hole 724b, and a part of its outer layer end face 730w is also in the gap 724c. Therefore, as shown in Figure 19 In (1), the pushing tool can push against the inner layer end face 730n from the central hole 724b, or push against the outer layer end face 730n from the gap 724c, and push the nut clamping tube out from the second end of the nut body (or nut through-hole), realizing the quick removal of the nut clamping tube from the nut body (or nut through-hole).

[0330] As can be seen from the above, when the nut clamping tube is a tube body structure with a tube seam, and the outer diameter of the nut clamping tube > the aperture of the central hole > the inner diameter of the nut clamping tube, regardless of the arc length of the convex teeth and the gap, the limiting part can bear the nut clamping tube and the nut clamping tube can be quickly removed from the nut body.

[0331] In this embodiment, the nut pipe clip 730 is formed by splicing multiple clip pipe walls. Similar to the sixth embodiment above, to prevent the clip pipe walls from slipping out of the gap, it is necessary to limit the arc length of the gap (or the arc length between adjacent two convex teeth). The designed maximum arc length of the gap max(L3) < the arc length of the smallest clip pipe wall among all the clip pipe walls forming the nut pipe clip min(L1), so that the arc length of any gap (or the maximum arc length of the gap) < the arc length of any clip pipe wall (or the arc length of the smallest clip pipe wall) among all the clip pipe walls forming the nut pipe clip. In this way, when any clip pipe wall is inserted into the nut through-hole, since the arc length of each clip pipe wall itself is greater than the arc length of any gap, each clip pipe wall cannot slip out from any gap, and at least one convex tooth will bear each clip pipe wall (reference can be made to the corresponding content in the sixth embodiment above).

[0332] Since the inner layer end face 730n of each clip pipe wall is at the center hole 724b at the first end, for the convex tooth bearing the clip pipe wall, even if the arc length of the convex tooth ≥ the arc length of the clip pipe wall, and the outer layer end face 730w at the first end of the clip pipe wall is just completely on this convex tooth and not at any gap, the pushing tool can directly contact the inner layer end face 730n of this clip pipe wall from the center hole 724b and push this clip pipe wall to push this clip pipe wall out from the second end of the nut body (or nut through-hole); if the arc length of the convex tooth < the arc length of the clip pipe wall, the inner layer end face 730n at the first end of this clip pipe wall is at the center hole 724b, and part of its outer layer end face 730w is still at the gap 724c. Therefore, 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 to push the clip pipe wall out from the second end of the nut body (or nut through-hole), realizing the rapid removal of the nut pipe clip from the nut body (or nut through-hole).

[0333] As can be seen from the above, when the nut pipe clip is formed by splicing multiple clip pipe walls, and the outer diameter of the nut pipe clip > the aperture of the center hole > the inner diameter of the nut pipe clip, and at the same time the arc length of any gap < the arc length of any clip pipe wall among all the clip pipe walls forming the nut pipe clip, regardless of the arc length of the convex tooth, the limiting part can carry the nut pipe clip and the nut pipe clip can be quickly removed from the nut body. For the material and structure of the connection body, fastening bolt, and external pipe in this embodiment, reference can be made to the first embodiment, which will not be elaborated here.

[0334] Embodiment Eight

[0335] For the above-mentioned first embodiment, its nut pipe clip 130 is a pipe structure formed by splicing two clip pipe walls 131 and 132 with different arc sizes.

[0336] The main difference from the first embodiment is that in the eighth embodiment, the nut clamping tube is formed by splicing tube structures with tube seams, and the tube seams are arranged along the direction of the nut clamping tube.

[0337] In the present invention, the bulging part of the connecting tube is pressed into the external tube to connect the connecting tube and the external tube and form a fluid passage; on both sides of the bulging part pressed into the external tube, a fastening nut and a fastening bolt are respectively arranged. The fastening nut and the fastening bolt are screwed tightly to clamp and push the bulging part pressed into the external tube, so as to fix the connection between the connecting tube and the external tube and form a seal; the fastening bolt is arranged on the second side of the bulging part and sleeved on the external tube; the fastening nut is arranged on the first side of the bulging part and sleeved on the connecting tube. Specifically, it is sleeved on the non-bulging part. This requires the fastening nut: its aperture should be greater than or equal to the maximum outer diameter R of the bulging part, so that the fastening nut can pass through the bulging part from the second end of the connecting tube and be sleeved on the non-bulging part, and at the same time, it should be less than the maximum outer diameter R of the bulging part, so that the fastening nut sleeved on the non-bulging part cannot pass through the bulging part and can clamp and push the bulging part.

[0338] The above two requirements for the aperture of the fastening nut are contradictory, but they are also the basic conditions that the fastening nut in the present invention must possess. In order to simultaneously meet the above two requirements and arrange the fastening nut on the first side of the bulging part, the present invention splits the fastening nut into a nut body and a nut clamping tube. The nut body and the nut clamping tube respectively implement part of the requirements and functions of the fastening nut. In particular, the contradictory requirements and functions of the fastening nut are executed and realized by different components. Specifically, a nut through-hole is opened inside the nut body, and the aperture of the nut through-hole is greater than or equal to the maximum outer diameter R of the bulging part. In this way, the nut body can pass through the bulging part from the second end of the connecting tube and be sleeved on the non-bulging part. The inner wall of the nut body is provided with a thread structure to cooperate with the fastening bolt for bolt tightening. At the same time, the nut body is used to carry the nut clamping tube and tighten and support the nut clamping tube, etc.; the nut clamping tube is arranged in the nut through-hole or the nut body. The aperture of the nut clamping tube is less than the maximum outer diameter R of the bulging part, and it is a tube structure formed by surrounding and splicing or fitting the non-bulging part. In this way, the nut clamping tube can directly be sleeved on the first bulging part and clamp and push the bulging part pressed into the external tube without passing through the bulging part.

[0339] In order to enable the nut clamping tube with an aperture smaller than the maximum outer diameter R of the bulging part to be arranged on the first side of the bulging part and sleeved on the non-bulging part, in the first embodiment, two clamping tube walls 131 and 132 with different arc sizes surround the non-bulging part 113 or the external tube 150 on its outer layer and are spliced to form the nut clamping tube 130. The nut clamping tube 130 is directly sleeved on the non-bulging part 113 or the external tube 150 on its outer layer and is located on the first side of the bulging part, without passing through the bulging part 112 to be arranged on the first side of the bulging part.

[0340] In the eighth embodiment, the nut clamping tube 1030 itself is a tube structure with a tube slit. The tube slit 1034 is arranged along the direction of the nut clamping tube. One end of the tube slit extends to the first end of the nut clamping tube 1030, and the other end extends to the second end of the nut clamping tube 1030, as Figure 20 shown; in this way, by expanding the tube slit 1034, the nut clamping tube 1030 can be directly sleeved on the non-bulging part or the outer tube outside it, and the nut clamping tube 1030 is placed on the first side of the bulging part, and the nut clamping tube 1030 does not need to pass through the bulging part to be arranged on the first side of the bulging part.

[0341] When assembling the nut body and the nut clamping tube on the non-bulging part to form a fastening nut in the eighth embodiment, first, the nut body is passed through the bulging part from the second end of the connecting tube and sleeved on the non-bulging part. Then, at the non-bulging part between the nut body and the bulging part, the tube slit 1034 is expanded, and the nut clamping tube 1030 is sleeved on the non-bulging part or the outer tube outside it, and the nut clamping tube 1030 is inserted into the nut through-hole (or the nut body) along the connecting tube (or the non-bulging part). The nut body tightly clamps the nut clamping tube 1030 through its inner wall, so that the tube slit 1034 is closely joined to form a complete tube structure. The nut clamping tube 1030 maintains the tube structure state, and its tube structure is stably shaped and forms a fastening nut with the nut body. When disassembling the fastening nut, the nut clamping tube 1030 is pushed out of the nut through-hole (or the nut body), the tube slit 1034 is expanded, and the nut clamping tube 1030 is removed from the non-bulging part or the outer tube outside it, and the nut body is removed from the second end of the connecting tube through the bulging part. For the materials and structures of the connecting body, fastening bolt, outer tube, and nut body in this embodiment, reference can be made to the first embodiment, which will not be elaborated here.

[0342] Embodiment Nine

[0343] In the first embodiment, the nut clamping tube 130 is formed by splicing two clamping tube walls 131 and 132 with different arc sizes. The arc of the clamping tube wall 132 is larger than the arc of the clamping tube wall 131. When the clamping tube walls 131 and 132 are spliced together, they can just form a complete tube structure (i.e., the nut clamping tube 130).

[0344] The main difference from the first embodiment is that in the ninth embodiment, the nut clamping tube 1130 is formed by splicing two clamping tube walls 1131 and 1132 with the same arc size. The arc of the clamping tube wall 1131 is equal to the arc of the clamping tube wall 132. When the clamping tube walls 1131 and 1132 are spliced together, they can just form a complete tube structure (i.e., the nut clamping tube 1130), as Figure 21 shown.

[0345] In the present invention, the aperture of the nut clamping tube is smaller than the maximum outer diameter R of the bulging part. The nut clamping tube cannot pass through the second end of the connecting tube, pass through the bulging part, and be sleeved on the non-bulging part. The present invention adopts the method of splicing or fitting the tube walls of the clamping tube, and the tube walls of the clamping tube are surrounded by the non-bulging part or the outer tube outside it, and are spliced or fitted to form the nut clamping tube. In this way, the nut clamping tube can be directly sleeved on the non-bulging part or the outer tube outside it without passing through the bulging part, and the bulging part pressed into the outer tube can be clamped and pushed.

[0346] In the first embodiment, the two tube walls 131 and 132 of the nut clamping tube that are spliced around the non-bulging part or the outer tube outside it have different arc sizes. The arc of the tube wall 131 is smaller than the arc of the tube wall 132. This means that at least two specifications of tube walls need to be prepared when manufacturing the device.

[0347] In the ninth embodiment of the present invention, the two tube walls 1131 and 1132 of the nut clamping tube that are spliced around the non-bulging part or the outer tube outside it have the same arc size. The tube walls 1131 and 1132 are both semi-circular tube walls. The tube wall 1131 and the tube wall 1132 are two completely identical tube walls. This means that only one specification of tube wall needs to be prepared when manufacturing the device, which will greatly save the production process and production cost in actual production and manufacturing. Moreover, the openings of each tube wall are all semi-circular arcs and can just directly fit the non-bulging part or the outer tube outside it for splicing, and there is no need to expand the opening of the tube wall and sleeve it on the non-bulging part or the outer tube outside it for splicing (if the two tube walls are of different sizes, there must be a tube wall with a major arc and a corresponding central angle greater than 180°. The opening of this tube wall is smaller, and when splicing to form the nut clamping tube, it is necessary to expand the opening and sleeve it on the non-bulging part or the outer tube outside it). The tube walls provided in this embodiment are very beneficial in actual production and application and are of great significance. For the materials and structures of the connection body, fastening bolts, outer tube, and nut body in this embodiment, reference can be made to the first embodiment, which will not be elaborated here.

[0348] Embodiment Ten

[0349] In the first embodiment, the nut clamping tube 130 is formed by splicing two tube walls 131 and 132 with different arc sizes. The tube walls 131 and 132 are spliced together to just form a complete tube structure (i.e., the nut clamping tube 130).

[0350] The main difference from the first embodiment is that in this tenth embodiment, the nut clamping tube 1230 is formed by splicing at least three tube walls, and the arc sizes of each tube wall are not completely the same. Each tube wall is spliced together to just form a complete tube structure (i.e., the nut clamping tube 1230).

[0351] In this embodiment, the nut pipe clip 1230 is formed by splicing three clip pipe walls with different arc sizes. For example, the arcs of the respective clip pipe walls can be 2 / 3 arcs (corresponding central angle of 240°), 1 / 6 arcs (corresponding central angle of 60°), and 1 / 6 arcs (corresponding central angle of 60°) respectively, or can be 1 / 2 arcs (corresponding central angle of 180°), 1 / 3 arcs (corresponding central angle of 120°), and 1 / 6 arcs (corresponding central angle of 60°) respectively, as Figure 22 shown.

[0352] In this embodiment, the nut pipe clip 1230 can also be formed by splicing four clip pipe walls with different arc sizes. For example, the arcs of the respective clip pipe walls can be 1 / 3 arcs (corresponding central angle of 120°), 1 / 6 arcs (corresponding central angle of 60°), and two 1 / 4 arcs (corresponding central angle of 90°) respectively.

[0353] For the number of clip pipe walls forming the nut pipe clip 1230 and the arc sizes, this embodiment does not make any limitations, nor does it limit that in other related examples, it can be designed according to the actual application situation; however, it should be noted that when the respective clip pipe walls are spliced together, they can just form a complete pipe structure (i.e., the nut pipe clip 1230). For the materials and structures of the connection body, fastening bolts, external pipes, and nut bodies in this embodiment, reference can be made to Embodiment 1, which will not be elaborated here.

[0354] According to the above deformation methods, further expansion can be carried out as follows:

[0355] In this expanded embodiment, the nut pipe clip is formed by splicing at least three clip pipe walls, and the arc sizes of the respective clip pipe walls are exactly the same. When the respective clip pipe walls are spliced together, they can just form a complete pipe structure (i.e., the nut pipe clip).

[0356] In this expanded embodiment, the nut pipe clip can be formed by splicing three clip pipe walls with 1 / 3 arcs, or can be formed by splicing four clip pipe walls with 1 / 4 arcs. This expanded embodiment does not make any limitations on the number of clip pipe walls forming the nut pipe clip, nor does it limit that in other related examples, it can be designed according to the actual application situation. The beneficial effects of this expanded embodiment can refer to the corresponding content in Embodiment 9 above, which will not be elaborated here.

[0357] Embodiment 11

[0358] In Embodiment 1, the nut pipe clip 130 is formed by splicing two clip pipe walls 131 and 132. At each adjacent joint, the fitting surface of the clip pipe wall 131 is closely fitted with the fitting surface of the clip pipe wall 132, thereby forming a complete pipe structure (i.e., the nut pipe clip 130).

[0359] The main difference from the first embodiment is that the nut tube clamp in the eleventh embodiment has a first positioning structure for positioning adjacent tube clamp walls at adjacent locations so that the two ends of the two adjacent tube clamp walls are aligned; the first positioning structure includes a positioning pin arranged on the side of one adjacent tube clamp wall and a positioning groove arranged on the side of another adjacent tube clamp wall.

[0360] In the first embodiment, the nut clamping tube 130 formed by the clamping tube wall 131 and the clamping tube wall 132 has two adjacent parts, wherein the side surface 131a of one adjacent part is tightly spliced ​​with the side surface 132a, and the side surface 131b of the other adjacent part is tightly spliced ​​with the side surface 132b. In the first embodiment, when the two clamping tube walls 131 and 132 are spliced ​​around the non-bulging part or the outer tube of the outer layer or the process of being spliced ​​and assembled into the nut through hole, the adjacent clamping tube walls are prone to relative slippage and unevenness of the two ends, such as Figure 23 As shown in Figure (1); if the formed nut clamp tube port is not neat, the clamping and pressing function of the first clamping part (i.e., the second end of the nut clamp tube) on the bulging part pressed into the external tube will be greatly affected, and the bulging part and the outer tube of its outer layer will be subjected to uneven forces in the circumferential direction, and the connection and sealing effect between the connecting tube and the external tube will be affected; for a nut clamp tube composed of multiple clamping walls, the above situation will be more prominent and obvious during use and cannot be ignored.

[0361] In the eleventh embodiment, the nut tube clamp 1330 is formed by splicing two tube clamp walls 1331 and 1332, wherein the tube clamp wall 1331 has side surfaces 1331a and 1331b, and the tube clamp wall 1332 has side surfaces 1332a and 1332b. In order to prevent the adjacent tube clamp walls from sliding relative to each other and the two ends from being uneven during splicing, and to ensure that the formed nut tube clamp port is neat, in the present embodiment, a positioning groove is provided at the middle position of the side surface 1331a of the tube clamp wall 1331 as a first positioning structure, a positioning pin is provided at the middle position of the side surface 1332a of the tube clamp wall 1332 as a corresponding first positioning structure to cooperate therewith, positioning pins are provided at both ends of the side surface 1331b of the tube clamp wall 1331 as a first positioning structure, and positioning grooves are provided at both ends of the side surface 1332b of the tube clamp wall 1332 as a corresponding first positioning structure to cooperate therewith, such as Figure 23 As shown in Figure (2).

[0362] When the clamping tube walls 1331 and 1332 are joined together, at an adjacent position of the nut clamping tube 1330, the positioning pin at the middle position of the side surface 1332a is inserted into the positioning groove at the corresponding position of the side surface 1331a. At the other adjacent position of the nut clamping tube 1330, the positioning pins at both ends of the side surface 1331b are respectively inserted into the positioning grooves at the corresponding positions of the side surface 1332b. When the adjacent clamping tube walls 1331 and 1332 are joined together, the two ends are aligned and there is no relative sliding. The port of the nut clamping tube formed by joining is neat, ensuring the connection and sealing effect between the connecting tube and the external tube. For the materials and structures of the connection body, fastening bolts, external tubes, and nut bodies in this embodiment, reference can be made to Embodiment 1, which will not be elaborated here.

[0363] In this embodiment, three or more first positioning structures can be provided on the side surface of the clamping tube 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 shapes of the positioning grooves or positioning pins 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 clamping tube 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 position of the nut clamping tube, the setting position, number, and shape of the positioning pins on the side surface of one adjacent clamping tube wall should match the setting position, number, and shape of the positioning grooves on the side surface of the other adjacent clamping tube wall.

[0364] In this embodiment, by providing the first positioning structures on the side surface of the clamping tube wall to position the adjacent clamping tube walls, the joining efficiency of the nut clamping tube walls is improved and the joining quality is ensured, having a good application effect.

[0365] Embodiment Twelve

[0366] In Embodiment 1, the inner wall of the first clamping portion 133 is a cylindrical curved surface. The first clamping portion 133 clamps and presses the bulging portion of the external tube by clamping the first bearing surface of the bulging portion with its inner edge 133o.

[0367] The main difference from Embodiment 1 is that in this Embodiment Twelve, the inner wall of the first clamping portion is designed with a conical curved surface, and this conical curved surface can fit with the first bearing surface of the bulging portion. The first clamping portion clamps and presses the bulging portion of the external tube by clamping the first bearing surface of the bulging portion with its conical curved surface.

[0368] In Embodiment 1, the first clamping portion 133 is the second end of the nut clamping tube, and the inner wall 133i of the first clamping portion 133 is a tubular curved surface or a cylindrical curved surface, such as Figure 24As shown in (1), and the inner diameter of the nut clamping tube 130 < the second composite outer diameter R2 (which means the inner diameter of the first clamping portion 133 < the second composite outer diameter R2). Therefore, when the fastening nut and the fastening bolt are screwed tightly, only the inner edge 133o of the inner wall of the first clamping portion 133 will be stuck on the first bearing surface 112a of the bulged portion to clamp and push the bulged portion of the externally inserted tube. This means that for the externally inserted tube outside the bulged portion, the force-bearing position is only the portion pushed by the inner edge 133o (this portion is only a circle). In the first embodiment, the force-bearing area of the externally inserted tube at the first clamping portion is very limited.

[0369] In this embodiment, the first clamping portion 1433 is still the second end of the nut clamping tube, but the inner wall 1433i of the first clamping portion 1433 is designed with a conical surface, and this conical surface can fit with the first bearing surface of the bulged portion, as Figure 24 shown in (2). And the inner diameter of the nut clamping tube 1430 < the second composite outer diameter R2 (which means the inner diameter of the first clamping portion 1433 and its conical surface < the second composite outer diameter R2). This makes it so that when the fastening nut and the fastening bolt are screwed tightly, the conical surface of the first clamping portion 1433 will be stuck on the first bearing surface of the bulged portion to clamp and push the bulged portion of the externally inserted tube. This means that for the externally inserted tube outside the bulged portion, the force-bearing position is the portion pushed by the conical surface (this portion is a conical surface). In this embodiment, the force-bearing area of the externally inserted tube at the first clamping portion is greatly expanded.

[0370] When the clamping and pushing forces at the first clamping portion are the same, in the first embodiment, the force-bearing area of the externally inserted 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 externally inserted tube is prone to deformation, damage, aging, etc. In this embodiment, the force-bearing area of the externally inserted 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, and thus the above-mentioned deformation, damage, aging, etc. are not likely to occur. In this embodiment, a conical surface that can fit with the first bearing surface of the bulged portion is designed on the inner wall of the first clamping portion, so that the externally inserted tube at the first clamping portion is protected, effectively improving the situation of excessive local stress in 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.

[0371] Based on the above, the present invention also provides a deformation example, specifically as follows:

[0372] 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 conical surface, and this conical surface can fit with the second bearing surface of the bulged portion. The second clamping portion is stuck at the second bearing surface of the bulged portion through its conical surface to clamp and push the bulged portion of the externally inserted tube.

[0373] Similar to the setting of the first clamping portion 133 described above, in the first embodiment, the second clamping portion 141 is the first end of the fastening bolt, and the inner wall 141i of the second clamping portion 141 is a tubular curved surface or a cylindrical curved surface, such as Figure 25 shown in (1) of Figure 25 , and the inner diameter of the second clamping portion 141 < the second composite outer diameter R2. Therefore, when the fastening nut and the fastening bolt 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 bearing surface of the bulging portion to clamp and push the bulging portion of the external pipe into it. This means that for the external pipe 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 pipe at the second clamping portion is very limited.

[0374] In this modified embodiment, the second clamping portion 1441 is still formed by the first end of the fastening bolt, but the inner wall of the second clamping portion 1441 is designed with a conical curved surface, and this conical curved surface can fit with the second bearing surface of the bulging portion, such as Figure 25 shown in (2) of Figure 25 . And the inner diameter of the second clamping portion 1441 < the second composite outer diameter R2 (which means the inner diameter of this conical curved surface < the second composite outer diameter R2). This makes it that when the fastening nut and the fastening bolt are screwed tightly, the conical curved 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 external pipe into it. This means that for the external pipe outside the bulging portion, the force-bearing position is the portion pushed by the conical curved surface (this portion is a conical curved surface). In this modified embodiment, the force-bearing area of the external pipe at the second clamping portion is greatly expanded.

[0375] When the clamping and pushing forces of the second clamping portion are the same, in the first embodiment, the force-bearing area of the external pipe 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 external pipe is prone to deformation, damage, aging and other situations; while in this embodiment, the force-bearing area of the external pipe 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 it is not easy to appear the above-mentioned deformation, damage, aging and other situations. In this embodiment, a conical curved 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 external pipe 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 external pipe.

[0376] According to the above deformation method, further expansion can be made as follows:

[0377] The main difference from the first embodiment is that in this extended embodiment, tapered surfaces are designed on the inner walls of the first clamping portion and the second clamping portion, and the tapered surfaces can be fitted with the corresponding bearing surfaces of the bulging portions; in this way, when the fastening nut and the fastening bolt are screwed tightly, on the first side of the bulging portion, the tapered 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 tapered 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 the first clamping portion and the second clamping portion are both 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, and the bulging portion 112 is clamped and fixed between the first clamping portion and the second clamping portion.

[0378] For the relevant explanations of the tapered surfaces of the first clamping portion and the second clamping portion clamping and pushing the bulging portion, reference can be made to the above two embodiments, and this will not be repeated here. In this extended embodiment, tapered surfaces that can be fitted with the corresponding bearing surfaces of the bulging portions are designed on the inner walls of the first clamping portion and the second clamping portion, which can protect the externally inserted tube parts at these two places of the first clamping portion and the second clamping portion at the same time, have the effect of extending the service life of the pipe fittings, can improve the sealing stability at these two places of the first clamping portion and the second clamping portion at the same time, ensure the balance of the clamping and pushing forces received on both sides of the bulging portion, and are of great significance to the safety and stability of the connection between the connecting pipe and the externally inserted tube.

[0379] Embodiment Thirteen

[0380] For the above-mentioned first embodiment, the inner diameter of the nut clamping tube 130 < the second composite outer diameter R2. Therefore, the second end of the nut clamping tube 130 can be used as the first clamping portion 133 to clamp and push the bulging portion of the externally inserted tube through the second end of the nut clamping tube 130.

[0381] The main difference from the first embodiment is that in this Embodiment Thirteen, the first clamping portion is an annular structure arranged inside the nut clamping tube. The annular structure is arranged along the circumferential direction on the inner wall at the second end of the nut clamping tube, and the inner diameter of the annular structure < the second composite outer diameter R2; therefore, this annular structure can be used as the first clamping portion to clamp and push the bulging portion of the externally inserted tube through this annular structure.

[0382] In the first embodiment, the inner diameter of the nut pipe clip 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 nut pipe clip 130 sleeved on the non-bulging part cannot pass through the bulging part with the outer pipe coated thereon (i.e., the bulging part pressed into the outer pipe), and the second end thereof 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 nut and the fastening bolt are screwed tightly, the second end of the nut pipe clip can directly serve as the first clamping part to clamp and push the bulging part pressed into the outer pipe, without the need to additionally provide a structure on the nut pipe clip as the first clamping part to realize the functions of clamping and pushing the bulging part; the inner diameter of the first clamping part 133 = the inner diameter of the nut pipe clip 130.

[0383] In the first embodiment, the second end of the nut pipe clip is used to clamp and push the bulging part pressed into the outer pipe. Therefore, there are requirements and limitations on the inner diameter of the nut pipe clip, and it is required that the inner diameter of the nut pipe clip < the second composite outer diameter R2. If the inner diameter of the nut pipe clip ≥ the second composite outer diameter R2, such a nut pipe clip can pass through the bulging part with the outer pipe coated thereon (i.e., the bulging part pressed into the outer pipe), and its second end cannot serve as the first clamping part to clamp and push the bulging part pressed into the outer pipe.

[0384] To solve the above problems, so that even if the inner diameter of the nut pipe clip is greater than or equal to the second composite outer diameter R2, the nut pipe clip can still clamp and push the bulging part pressed into the outer pipe, in this embodiment, a circular ring structure is provided in the nut pipe clip as the first clamping part 1533, as Figure 26 shown.

[0385] In this embodiment, the circular ring structure is arranged along the circumferential direction on the inner wall of the second end of the nut pipe clip. Therefore, the inner diameter of the first clamping part 1533 < the inner diameter of the nut pipe clip 1530; at the same time, the inner diameter of the circular ring structure < the second composite outer diameter R2. Therefore, the circular ring structure can serve as the first clamping part 1533. When the fastening nut and the fastening bolt are screwed tightly, the nut pipe clip sleeved on the non-bulging part and the first clamping part 1533 inside it cannot pass through the bulging part with the outer pipe coated thereon (i.e., the bulging part pressed into the outer pipe), and the first clamping part 1533 will be stuck at the first bearing surface of the bulging part to clamp and push the bulging part pressed into the outer pipe, as Figure 26 shown.

[0386] In this embodiment, for the nut pipe clip formed by splicing the clip pipe walls, the corresponding first clamping part portions are provided on the inner walls of the second ends of the respective clip pipe walls, and the clip pipe wall and its corresponding first clamping part portion can be integrally formed; while the respective pipe walls surround the non-bulging part or the outer pipe outside it and are spliced to form a nut pipe clip, a complete first clamping part is also formed inside the nut pipe clip, and the first clamping part surrounds the non-bulging part or the outer pipe outside it.

[0387] 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.

[0388] In this embodiment, a circular ring structure is provided on the inner wall of the second end of the nut clamp tube as the first clamping portion, so that even if the inner diameter of the nut clamp tube is greater than or equal to the second composite outer diameter R2, the nut clamp tube can still clamp and push into the bulging portion of the external tube, thereby improving the adaptability of the nut clamp tube.

[0389] Embodiment 14

[0390] For the above-mentioned embodiment 1, the outer diameter of the nut clamp tube 130 is equal to the aperture of the nut through hole 123; therefore, the nut body 120 can tighten the assembled nut clamp tube 130 through its inner wall (or the nut through hole 123 can tighten the nut clamp tube 130 through its hole wall), so that the nut clamp tube maintains a tube structure state.

[0391] The main difference from Example 1 is that in this Example 14, the outer diameter of the nut clamp tube is less than the aperture of the nut through hole, and a tightening structure is provided on the outer wall of the nut clamp tube, and the outer diameter of the tightening structure is equal to the aperture of the nut through hole; therefore, the nut body can still tighten the tightening structure through its inner wall (or the nut through hole can tighten the tightening structure through its hole wall) to keep the nut clamp tube in a tube structure state.

[0392] In the first embodiment, the outer diameter of the nut clamp tube 130 is equal to the aperture of the nut through hole 123. Therefore, the nut clamp tube 130 or its clamp tube walls 131 and 132 can be inserted into the nut through hole 123, and its outer wall is tightly fitted with the inner wall of the nut body 120 (i.e., the hole wall of the nut through hole). Therefore, when the nut clamp tube 130 is placed in the nut through hole 123, the nut body 120 can clamp the assembled nut clamp tube 130 through its inner wall (or the nut through hole 123 can clamp the assembled nut clamp tube 130 through its hole wall), so that the assembled nut clamp tube maintains a tube structure state, and its tube structure is stable and fixed without loosening. The first embodiment tightens the nut clamp tube through the nut body, so it has requirements and restrictions on the outer diameter of the nut clamp tube, and requires the outer diameter of the nut clamp tube to be equal to the aperture of the nut through hole.

[0393] If the outer diameter of the nut clamping tube < the diameter of the nut through-hole, although this nut clamping tube or its clamping tube wall can be inserted into the nut through-hole, it does not fit against the inner wall of the nut body (i.e., the wall of the nut through-hole). The nut body cannot effectively tighten the formed nut clamping tube. In this way, the adjacent clamping tube walls do not fit, and gaps will form 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 nut clamping tube is much smaller than the diameter of the nut through-hole, the above phenomenon will be more obvious. Its clamping tube wall will even be loose and wobble in the nut through-hole, and a nut clamping tube with a stable tube structure cannot be formed.

[0394] To solve the above problems and enable the nut clamping tube with an outer diameter smaller than the diameter of the nut through-hole to be inserted into the nut through-hole and still maintain the tube structure state and a stable and fixed structure, in this embodiment, a tightening structure 1634 is provided on the outer wall of this nut clamping tube, as Figure 27 shown.

[0395] In this embodiment, the tightening structure 1634 is a complete ring structure and is provided on the outer wall of the nut clamping tube. The outer diameter of the tightening structure 1634 > the outer diameter of the nut clamping tube. The tightening structure 1634 is provided at the middle position of the nut clamping tube, as Figure 27 shown in (1) of Figure 28 In this embodiment, the outer diameter of the tightening structure 1634 = the diameter of the nut through-hole. Therefore, the nut clamping tube 1630 or its clamping tube wall can be inserted into the nut through-hole, and the outer wall of the tightening structure 1634 is in close contact with the inner wall of the nut body (i.e., the wall of the nut through-hole), as Figure 28 shown. When the nut clamping tube 1630 is placed in the nut through-hole, the nut body 1620 can tighten the tightening structure 1634 through its inner wall (or the nut through-hole can tighten the tightening structure 1634 through its wall), thereby realizing the tightening of the formed nut clamping tube 1630, so that the formed nut clamping tube maintains the tube structure state and the tube structure is stably fixed and does not come loose.

[0396] In addition, in Embodiment 1, the design of the outer diameter of the nut clamping tube 130 = the diameter of the nut through-hole 123, although it enables the nut body to effectively tighten the formed nut clamping tube, the entire outer wall of the nut clamping tube 130 (or the clamping tube walls 131, 132) is in close contact with the inner wall of the nut body 120 (i.e., the wall of the nut through-hole). This results in a large contact area and a large frictional force between the nut clamping tube and the nut body. Pushing the nut clamping tube or its clamping tube wall into or out of the nut through-hole will be subject to a large frictional resistance and will be very laborious. In the case of large dimensional errors of components or a narrow assembly space, the operation of pushing the nut clamping tube or its clamping tube wall into or out of the nut through-hole will be very difficult.

[0397] In this embodiment, the outer diameter of the nut clamping tube < the aperture diameter of the nut through-hole, and the outer diameter of the tightening structure 1634 = the aperture diameter of the nut through-hole, so that the nut body can still effectively tighten the nut 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 nut body 120 (i.e., the wall of the nut through-hole). This greatly reduces the contact area between the nut clamping tube and the nut body, and naturally reduces the formed frictional force. The frictional resistance received when pushing the nut clamping tube or its clamping wall into or out of the nut through-hole is small. Then, it is relatively easy and effortless to push the nut clamping tube or its clamping wall into or out of the nut through-hole.

[0398] In this embodiment, the nut clamping tube 1630 is a tube structure formed by splicing two clamping walls. The outer wall of each clamping wall is provided with its corresponding tightening structure part. Each clamping wall and its corresponding tightening structure part can be integrally formed. In this way, when the walls of the nut clamping tube are spliced together to form a complete nut clamping tube, a complete tightening structure 1634 is also spliced on the outer wall of the nut clamping tube.

[0399] Compared with the first embodiment, in this embodiment, by providing a tightening structure on the outer wall of the nut clamping tube and setting the outer diameter of the tightening structure = the aperture diameter of the nut through-hole, the nut clamping tube with an outer diameter smaller than the aperture diameter of the nut through-hole can also maintain a spliced state and be stably shaped in the nut through-hole. At the same time, it also makes the operation of pushing the nut clamping tube into or out of the nut through-hole more labor-saving and easy, which has important significance in practical applications.

[0400] Based on the above, the present invention also provides another deformation example, specifically as follows:

[0401] The main difference from the above-mentioned fourteenth embodiment is that: in this deformed embodiment, the tightening structure 1634 is provided at the second end of the nut clamping tube.

[0402] As Figure 27 shown in (2) in the figure, the tightening structure 1634 is provided on the outer wall of the second end of the nut clamping tube. In this way, only when the nut clamping tube is about to be completely pushed into the nut through-hole or just starts to be pushed out of the nut through-hole, the tightening structure 1634 moves inside the nut through-hole and will be in contact with the inner wall of the nut body to form a frictional resistance; during other processes of pushing the nut clamping tube into or out of the nut through-hole, the tightening structure 1634 moves outside the nut through-hole and is not in contact with the inner wall of the nut body, so no frictional resistance will be formed. This makes it more labor-saving and easy to push the nut clamping tube or its clamping tube into or out of the nut through-hole.

[0403] It should be noted that in the present invention, the tightening structure 1634 can be provided at any position on the outer wall of the nut clamping tube. Even for different clamping walls, the tightening structure parts provided on their outer walls can be at different positions, such as Figure 27As shown in (3). 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 nut through-hole, the nut pipe clamp can be placed in the nut through-hole and can be effectively tightened by the nut body, maintaining the assembled state and stable shaping.

[0404] Based on the above, the present invention also provides another deformation example, which is specifically as follows:

[0405] The main difference from the above-mentioned fourteenth embodiment is that in this deformed embodiment, the tightening structure 1634 is an incomplete circular ring structure and is composed of several discontinuous circular ring segments, as Figure 27 shown in (4). When the nut pipe clamp is placed in the nut through-hole, the outer walls of each circular ring segment are closely attached to the inner wall of the nut body 120 (i.e., the wall of the nut through-hole), so that the nut body 1620 can tighten the tightening structure 1634 through its inner wall (or the nut through-hole can tighten the tightening structure 1634 through its wall), thereby tightening the assembled nut pipe clamp 1630, so that the assembled nut pipe clamp maintains the pipe structure state and its pipe structure is stably shaped without loosening. This deformed embodiment has the same technical effect as the above-mentioned fourteenth embodiment. For specific details, reference can be made to the corresponding content of the fourteenth embodiment, which will not be repeated here.

[0406] Embodiment Fifteen

[0407] For the above-mentioned first embodiment, the outer diameter of the nut pipe clamp 130 = the aperture of the nut through-hole 123. Therefore, the nut body 120 can tighten the assembled nut pipe clamp 130 through its inner wall (or the nut through-hole 123 can tighten the nut pipe clamp 130 through its wall), so that the nut pipe clamp maintains the pipe structure state.

[0408] The main difference from the first embodiment is that in this fifteenth embodiment, the concave-convex structures are provided on the walls of each pipe clamp; at the adjacent joints of the nut pipe clamp, the concave-convex structures of the adjacent pipe clamp walls are mutually engaged and form a complete pipe wall at the engagement position; at the same time, the concave-convex structures of the adjacent pipe clamp walls also bite or hook each other, so that a connection is formed between the adjacent pipe clamp walls and the nut pipe clamp maintains the pipe structure state. In this embodiment, at the adjacent joints of the nut pipe clamp, the concave-convex structure of one adjacent pipe clamp wall is a groove opened on the side surface, the groove extends along the direction of the nut pipe clamp and the extension length is equal to the pipe length of the nut pipe clamp, and the concave-convex structure of the other adjacent pipe clamp wall is a convex block provided on the side surface, the convex block extends along the direction of the nut pipe clamp and the extension length is equal to the pipe length of the nut pipe clamp.

[0409] This article has clearly pointed out in Implementation 16: In Example 1, the outer diameter of the nut clamp tube 130 = the aperture of the nut through hole 123, so the nut clamp tube 130 or its clamp tube walls 131, 132 can be inserted into the nut through hole 123, and its outer wall is tightly fitted with the inner wall of the nut body 120 (i.e., the hole wall of the nut through hole), so when the nut clamp tube 130 is placed in the nut through hole 123, the nut body 120 can use its inner wall (or the nut through hole 123 can use its hole wall) to tighten the spliced ​​nut clamp tube 130, so that the spliced ​​nut clamp tube maintains a tube structure state, and its tube structure is stable and fixed without loosening. Example 1 tightens the nut clamp tube through the nut body, so it has requirements and restrictions on the outer diameter of the nut clamp tube, and requires the outer diameter of the nut clamp tube to be = the aperture of the nut through hole.

[0410] If the outer diameter of the nut clamp tube is smaller than the aperture of the nut through hole, although the nut clamp tube or its clamp tube wall can be inserted into the nut through hole, it does not fit with the inner wall of the nut body (i.e., the hole wall of the nut through hole), and the nut body cannot effectively tighten the nut clamp tube formed by splicing. In this way, the adjacent clamp tube walls do not fit together, and gaps are 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 nut clamp tube is much smaller than the aperture of the nut through hole, the above phenomenon will be more obvious, and its clamp tube wall may even become loose and shake in the nut through hole, and a nut clamp tube with a stable structure cannot be formed.

[0411] In order to solve the above problems, the nut clamp tube (including the nut clamp tube with an outer diameter less than or equal to the aperture of the nut through hole) inserted into the nut through hole maintains a tube structure state and the structure is stable and fixed. This embodiment provides a new technical solution. In this embodiment, a concave-convex structure is provided on each clamp tube wall. At each adjacent part of the nut clamp tube, the concave-convex structures of adjacent clamp tube walls are interlocked and form a complete tube wall at the interlocking part. At the same time, the concave-convex structures of adjacent clamp tube walls also bite or hook each other, so that a connection is formed between the adjacent clamp tube walls, so that the nut clamp tube maintains a tube structure state.

[0412] In this embodiment, the nut clamp tube 1830 is a tube structure formed by the mutual engagement of the tube clamp walls 1831 and 1832; wherein, grooves 1836 are provided on both sides of the tube clamp wall 1832 as a concave-convex structure, and protrusions 1837 are provided on both sides of the tube clamp wall 1831 as a concave-convex structure; at each adjacent portion of the nut clamp tube, the protrusion 1837 of the tube clamp wall 1831 is embedded in the groove 1836 of the tube clamp wall 1832, and the protrusion 1837 and the groove 1836 form a complete tube wall at the engagement portion (referring to the position where the protrusion is embedded in the groove, which belongs to or is located at the adjacent portion), and at the same time, the protrusion 1837 and the groove 1836 also bite each other, so that the adjacent tube clamp walls 1831 and 1832 are connected at the adjacent portion, so that the nut clamp tube 1830 maintains a tube structure state.

[0413] Specifically, bumps 1837 are respectively provided on each side surface of the clip pipe wall 1831, and the bumps 1837 on each side surface extend along the direction of the nut clip pipe, from one end of the clip pipe wall to the other end, and the extension length of each bump 1837 is equal to the pipe length of the clip pipe wall 1831 or the nut clip pipe 1830. Each bump 1837 protrudes from its side surface towards the outside of the pipe wall along the circumferential direction of the pipe wall; each bump has a head 1837g and a tail 1837h, and the part of the bump connected to the side surface is the tail 1837h, and the rest is the head 1837g, and the head 1837g of the bump is larger than the tail 1837h, as Figure 29 shown.

[0414] Grooves 1836 are respectively formed on each side surface of the clip pipe wall 1832, and the grooves 1836 on each side surface extend along the direction of the nut clip pipe, from one end of the clip pipe wall to the other end, and the extension length of each groove 1836 is equal to the pipe length of the clip pipe wall 1832 or the nut clip pipe 1830. Each groove 1836 is recessed from its side surface towards the inside of the pipe wall along the circumferential direction of the pipe wall; each groove has a notch 1836e and a bottom 1836d. Among them, the part of the groove close to the side surface is the notch 1836e (the notch faces the side surface), and the rest is the bottom 1836d (the bottom is away from the side surface), and the bottom 1836d of the groove is larger than the notch 1836e, as Figure 29 shown; the groove walls on both sides of each groove are respectively the inner wall and the outer wall of its clip pipe wall. Each groove also has two ports 1836f; in this embodiment, each groove 1836 extends along the direction of the nut clip pipe, from one end of the clip pipe wall to the other end. Therefore, ports 1836f are respectively formed at both ends of the clip pipe wall for the groove 1836, and the bump 1837 can be inserted into the groove 1833 from the port 1836f of the groove, and it can make the two ends of the clip pipe walls 1831 and 1832 align when they are fitted together, as Figure 29 shown in the figure.

[0415] Ports 1936f are respectively formed on the inner wall and the outer wall of the clip pipe wall for the groove 1936

[0416] The shape and size of the bump 1837 match the groove 1836 into which it is inserted. At each adjacent joint of the nut clamping tube 1830, the bump 1837 on the clamping tube wall 1831 is inserted into the groove 1833 on the clamping tube wall 1832. The bump 1837 and the groove 1836 form a complete tube wall at the fitting position. The head 1837g of the bump is located at the bottom 1836d of the groove, and the tail 1837h is located at the notch 1836e of the groove. The head 1837g of the bump is larger than the tail 1837h, that is, the head 1837g of the bump is larger than the notch 1836e of the groove. Therefore, when the bump 1837 is inserted into the groove 1833 from the port 1836f of the groove, the head 1837g of the bump will be stuck at the notch 1836e of the groove and cannot pass through the notch 1836e. In this way, the bump 1837 and the groove 1836 are engaged with each other in the circumferential direction of the tube wall, and the adjacent clamping tube walls 1831 and 1832 are connected at the adjacent joints, so that the formed nut clamping tube maintains the tube structure state, and its tube structure is stably formed and does not come loose.

[0417] The shapes of the bump 1837 and the groove 1836 engaged with it are the cross-sectional shapes perpendicular to their extension directions. In this embodiment, the shapes of the bump 1837 and the groove 1836 engaged with it are also the shapes presented at the end of the nut clamping tube. In this embodiment, the shapes of the bump 1837 and the groove 1836 engaged with it are convex-shaped, as shown in Figure 30 (1) shown; 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 circular arc shape, trapezoid shape, pentagon shape, hexagon shape, deformed trapezoid shape, racket shape (also can be called deformed circular arc shape), petal shape (also can be called cat's paw shape or deformed circular arc shape), Christmas tree shape (also can be called deformed triangle shape or arrow shape), etc., as shown in Figure 30 (2)-(9) shown. 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 notch of the groove catches the head of the bump, so that the bump and the groove form a complete tube wall at the fitting position and are engaged with each other at the same time, forming a connection between the adjacent clamping tube walls at the adjacent joints; the specific shape of the groove (or the bump) in this embodiment is not limited, nor is it limited in other related embodiments.

[0418] In this embodiment, bumps and grooves are provided on the side surface of the clip wall as concave-convex structures, so that adjacent clip walls are mutually engaged at the fitting position to form a complete pipe wall and are simultaneously engaged with each other to form a connection, enabling the nut clip pipe formed by fitting to maintain the pipe structure state and have a stable and fixed structure, without relying on the tightening effect of the nut body. Therefore, the requirement for the outer diameter of the nut clip pipe in this embodiment is relatively loose. Whether the outer diameter of the nut clip pipe 1730 is equal to or less than the aperture of the nut through-hole, it can be used in cooperation with the nut body. This embodiment improves the mutually restrictive relationship between the aperture of the nut through-hole and the outer diameter of the nut clip pipe, expands the applicable range of the nut clip pipe, and improves the adaptability between the nut clip pipe and the nut body, having good application prospects.

[0419] Based on the above, the present invention also provides a deformation example, specifically as follows:

[0420] The main difference from the above-mentioned Embodiment 15 is that: in this deformed embodiment, a groove 1836 is provided on one side surface of the clip wall 1831 as a concave-convex structure, and a bump 1837 is provided on the other side surface as a concave-convex structure; similarly, a groove 1836 is provided on one side surface of the clip wall 1832 as a concave-convex structure, and a bump 1837 is provided on the other side surface as a concave-convex structure, as shown in Figure 31 (1) in

[0421] At an adjacent position of the nut clip pipe 1830, the bump 1837 of the clip wall 1831 is embedded in the groove 1836 of the clip wall 1832; at another adjacent position of the nut clip pipe 1830, the bump 1837 of the clip wall 1832 is embedded in the groove 1836 of the clip wall 1831. This deformed embodiment has the same technical effect as the above-mentioned embodiment, and will not be repeated here.

[0422] Based on the above, the present invention also provides another deformation example, specifically as follows:

[0423] The main difference from the above-mentioned Embodiment 15 is that: in this deformed embodiment, on each side surface of the clip wall 1831, a plurality of bumps 1837 are distributed along the direction of the nut clip pipe. The length of each bump 1837 is less than the pipe length of the nut clip pipe, and the bumps 1837 are not connected. The number and length of the bumps on each side surface are not limited in this deformed embodiment, nor are they limited in other related examples. In actual applications, they can be designed according to needs. In this deformed embodiment, bumps 1837 are provided at the second end of the nut clip pipe to ensure the formation of a complete pipe wall at the second end of the nut clip pipe, so that the second end of the nut 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 31 (2) in

[0424] It should be noted that in this modified embodiment, the convex blocks 1837 on one side of the clamping tube wall 1831 can also extend from one end of the clamping tube wall to the other end along the direction of the nut clamping tube, and are as long as the clamping tube wall 1832 or the nut clamping tube 1830. On the other side, a plurality of convex blocks 1837 are distributed along the direction of the nut clamping tube, and there is a convex block 1837 at the second end of the nut clamping tube, as shown in Figure 31 shown in (3) of

[0425] Embodiment Sixteen

[0426] For the above-mentioned Embodiment Fifteen, at each adjacent joint of the nut clamping tube, the concave-convex structure of one adjacent clamping tube wall is a groove opened on the side surface. The groove extends along the direction of the nut clamping tube and the extension length is equal to the tube length of the nut clamping tube. The concave-convex structure of the other adjacent clamping tube wall is a convex block provided on the side surface. The convex block extends along the direction of the nut clamping tube and the extension length is equal to the tube length of the nut clamping tube.

[0427] The main difference from Embodiment Fifteen is that in this Embodiment Sixteen, at each adjacent joint of the nut clamping tube, the concave-convex structure of one adjacent clamping tube wall is a plurality of grooves opened on the side surface. The plurality of grooves are distributed along the direction of the nut clamping tube. Each groove extends along the direction of the tube diameter and penetrates the tube wall. The concave-convex structure of the other adjacent clamping tube wall is a plurality of convex blocks provided on the side surface. The plurality of convex blocks are distributed along the direction of the nut clamping tube. Each convex block extends along the direction of the tube diameter and the extension length is equal to the wall thickness of the tube wall.

[0428] To solve the problems described in Embodiment Fifteen and keep the nut clamping tube (including the nut clamping tube with an outer diameter less than or equal to the aperture of the nut through hole) inserted into the nut through hole in a tube structure state and with a stable and fixed structure, this embodiment provides a new technical solution, which is different from the technical solution of Embodiment Fifteen.

[0429] In this embodiment, the nut clamping tube 1930 is a tube structure formed by the mutual engagement of the clamping tube walls 1931 and 1932. Among them, a plurality of grooves 1936 are opened on both side surfaces of the clamping tube wall 1932 as the concave-convex structure, and a plurality of convex blocks 1937 are provided on both side surfaces of the clamping tube wall 1931 as the concave-convex structure. At the adjacent joint of the nut clamping tube, the convex blocks 1937 on one side surface of the clamping tube wall 1931 are respectively inserted into the corresponding grooves 1936 on one side surface of the clamping tube wall 1932. At the engagement position, each convex block 1937 and the corresponding groove 1936 form a complete tube wall. At the same time, the convex block 1937 and the groove 1936 are engaged with each other, so that the adjacent clamping tube walls 1931 and 1932 are connected at the adjacent joint, and the nut clamping tube 1930 is kept in a tube structure state.

[0430] Specifically, a number of bumps 1937 are respectively provided on each side surface of the clip pipe wall 1931, and the bumps 1937 on each side surface are distributed along the direction where the nut clip pipe is located; each bump 1937 extends along the direction of the pipe diameter, and its extension length is equal to the wall thickness of the pipe wall. That is to say, each bump 1937 extends from the outer wall of the clip pipe wall to the inner wall (or from the inner wall of the clip pipe wall to the outer wall) along the direction of the pipe diameter. Each bump 1937 protrudes from its side surface towards the outside of the pipe wall along the circumferential direction of the pipe wall; each bump has a head 1937g and a tail 1937h. The bump 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 bump is larger than the tail 1937h, as Figure 32 shown.

[0431] A number of grooves 1936 are respectively formed on each side surface of the clip pipe wall 1932, and the grooves 1936 on each side surface are distributed along the direction where the nut clip pipe is located; each groove 1936 extends along the direction of the pipe diameter and penetrates the pipe wall (or its extension length is equal to the wall thickness of the pipe wall). That is to say, each groove 1936 extends from the outer wall of the clip pipe wall to the inner wall (or from the inner wall of the clip pipe wall to the outer wall) along the direction of the pipe diameter. Each groove 1936 is recessed from its side surface towards the inside of the pipe wall along the circumferential direction of the pipe 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 32 shown. Each groove also has two ports 1936f; in this embodiment, each groove 1936 extends along the direction of the pipe diameter, from the outer wall of the clip pipe wall to the inner wall (or from the inner wall of the clip pipe wall to the outer wall), and penetrates the pipe wall. Therefore, the groove 1936 respectively forms ports 1936f on the inner wall and the outer wall of the clip pipe wall, and the bump 1937 can be embedded into the groove 1936 from the port 1936f of the groove.

[0432] At each adjacent location of the nut pipe clip 1930, the bumps 1937 on the side surface of the clip pipe wall 1931, their quantity and setting positions correspond to the grooves 1936 on the side surface of the clip pipe wall 1932, and the shape and size of the bumps 1937 match those of the grooves 1936. Each bump 1937 on the clip pipe wall 1931 is respectively embedded into the groove 1933 at the corresponding position of the clip pipe wall 1932. The bump 1937 and the groove 1936 form a complete pipe 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 engaged with each other in the circumferential direction of the pipe wall where the pipe wall is located, and the adjacent clip pipe walls 1931 and 1932 form a connection at the adjacent location, so that the nut pipe clip formed by fitting maintains the pipe structure state, and its pipe 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 clip pipe wall are not limited, nor are they limited in other related embodiments. As long as the grooves and bumps on the adjacent clip pipe walls at the adjacent location of the nut pipe clip can correspond and fit with each other.

[0433] 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 nut pipe clip. In this embodiment, the shapes of the bump 1937 and the groove 1936 engaged with it are trapezoidal, as Figure 33 shown in (1) in 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 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) in 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 pipe wall at the fitting location, they are also engaged with each other, forming a connection between the adjacent clip pipe walls at the adjacent location; in this embodiment, the specific shapes of the grooves (or rather, the bumps) are not limited, nor are they limited in other related embodiments.

[0434] 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 fifteenth embodiment. However, they also serve as the concave-convex structures to enable the adjacent clip pipe walls to be mutually engaged at the fitting position to form a complete pipe wall and to be mutually occluded to form a connection, so that the nut 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 nut body. This embodiment has the same technical effects as the fifteenth embodiment above. For the relevant technical effects, reference can be made to the fifteenth embodiment, and details will not be repeated here.

[0435] Embodiment Seventeen

[0436] For the above-mentioned fifteenth embodiment, at each adjacent position of the nut 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 nut clip pipe and the extension length is equal to the pipe length of the nut 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 nut clip pipe and the extension length is equal to the pipe length of the nut clip pipe.

[0437] The main difference from the fifteenth embodiment is that in this seventeenth embodiment, at each adjacent position of the nut 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 nut clip pipe and the extension length is equal to the pipe length of the nut 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 nut clip pipe and the extension length is equal to the pipe length of the nut clip pipe.

[0438] To solve the problems described in the fifteenth embodiment and enable the nut clip pipe (including the nut clip pipe with an outer diameter less than or equal to the aperture of the nut through-hole) inserted into the nut through-hole to maintain the pipe structure state and have a stable and fixed structure, this embodiment also provides a new technical solution, which is different from the technical solutions of the fifteenth and nineteenth embodiments.

[0439] In this embodiment, the nut pipe clip 2030 is a pipe structure formed by the mutual engagement of the pipe clip walls 2031 and 2032. Among them, second grooves 2036 are provided on the outer walls on both sides of the pipe clip wall 2032 as concave-convex structures, and first grooves 2038 are provided on the inner walls on both sides of the pipe clip wall 2031 as concave-convex structures. At the adjacent joints of the nut pipe clip, the outer side wall of the first groove 2038 (the outer side wall is the groove side wall where the side surface of the pipe clip wall is located, and the outer side wall in this embodiment is equivalent to the convex block 1837 in Embodiment 15) is embedded in the second groove 2036, and at the same time, the outer side wall of the second groove 2036 is embedded in the first groove 2038. The first groove 2038 and the second groove 2036 form a complete pipe wall at the engagement part. At the same time, the outer side wall of the first groove 2038 and the outer side wall of the second groove 2036 are mutually hooked, so that the adjacent pipe clip walls 2031 and 2032 are connected at the adjacent joints, and the nut pipe clip 1930 maintains the pipe structure state.

[0440] Specifically, first grooves 2038 are respectively provided on the inner walls on both sides of the pipe clip wall 2031. The first grooves 2038 on the inner walls on both sides extend along the direction of the nut pipe clip, from one end of the pipe clip wall to the other end, and the extension length of each first groove 2038 is equal to the pipe length of the pipe clip wall 2031 or the nut pipe clip 2030. Each first groove 2038 is recessed from the inner wall of the pipe clip wall towards the outer wall along the pipe diameter direction. Each first groove 2038 has a groove opening 2038e and a groove bottom 2038d. Among them, the part of the first groove 2038 close to the inner wall is the groove opening 2038e (the groove opening faces the inner wall), and the rest is the groove bottom 2038d (the groove 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 pipe clip wall to the other end along the direction of the nut pipe clip. Therefore, ports 2038f are respectively formed at both ends of the pipe clip wall by the first groove 2038, as Figure 34 shown.

[0441] Similarly, second grooves 2036 are respectively formed on the outer walls on both sides of the clamp pipe wall 2032. The second grooves 2036 on both outer walls extend along the direction where the nut clamp pipe is located, from one end of the clamp pipe wall to the other end, and the extension length of each second groove 2036 is equal to the pipe length of the clamp pipe wall 2032 or the nut clamp pipe 2030. Each second groove 2036 is formed by recessing from the outer wall of the clamp 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 far 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 clamp pipe wall to the other end along the direction where the nut clamp pipe is located. Therefore, ports 2036f are respectively formed at both ends of the clamp pipe wall of the second groove 2036, as Figure 34 shown.

[0442] For the 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 nut clamp pipe or the clamp 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 nut clamp pipe or the clamp 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.

[0443] 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 nut clamp pipe. In this embodiment, the shape of the outer side wall and the groove engaged therewith is rectangular, as Figure 34As 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.

[0444] At each adjacent part of the nut pipe clamp 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 pipe clamp walls 2031 and 2032 are connected in the circumferential direction, so that the formed nut pipe clamp 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 the fifteenth embodiment above. For the relevant technical effects, please refer to the fifteenth embodiment, and they will not be repeated here.

[0445] Based on the above, the present invention also provides a deformation example, specifically as follows:

[0446] The main difference from the seventeenth embodiment above is that: in this deformation embodiment, a first groove 2038 is provided as a concave-convex structure on the inner wall of one side of the pipe clamp wall 2031, and a second groove 2036 is provided as a concave-convex structure on the outer wall of the other side; a first groove 2038 is also provided as a concave-convex structure on the inner wall of one side of the pipe clamp wall 2032, and a second groove 2036 is provided as a concave-convex structure on the outer wall of the other side, as Figure 35 shown.

[0447] At an adjacent part of the nut pipe clamp 2030, the first groove 2038 on the inner wall of the pipe clamp wall 2031 is mutually engaged with the second groove 2036 on the outer wall of the pipe clamp 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 nut pipe clamp 2030, the second groove 2036 on the outer wall of the pipe clamp wall 2031 is mutually engaged with the first groove 2038 on the inner wall of the pipe clamp 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.

[0448] Based on the above, the present invention also provides another deformation example, specifically as follows:

[0449] The main difference from the seventeenth embodiment above is that: in this embodiment, the shapes of the outer sidewall and the groove fitted with it can be designed with reference to the shapes of the protrusion 1837 and the groove 1836 fitted with it in the fifteenth embodiment, including but not limited to convex shape, arc shape, trapezoid shape, pentagon shape, hexagon shape, deformation of trapezoid shape, 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 shape or arrow shape), etc., as Figure 36 shown.

[0450] 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 engaged with each other 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 engaged with each other 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 engaged with each other 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 along the circumferential direction of the pipe wall and engaged with each other in the direction of the pipe diameter, which will make the fitting and connection of the adjacent pipe walls 2031 and 2032 more stable and firm. This modified embodiment has the same technical effect as the above embodiment, and will not be repeated here.

[0451] Embodiment Eighteen

[0452] For the above-mentioned fifteenth embodiment, at each adjacent joint of the nut pipe clamp, the concave-convex structure of one adjacent pipe wall is a groove opened on the side surface, the groove extends along the direction of the nut pipe clamp, and the extension length is equal to the pipe length of the nut pipe clamp. The concave-convex structure of the other adjacent pipe wall is a protrusion provided on the side surface, the protrusion extends along the direction of the nut pipe clamp, and the extension length is equal to the pipe length of the nut pipe clamp.

[0453] The main difference from the fifteenth embodiment is that: in this eighteenth embodiment, each pipe wall of the nut 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 walls in the nut pipe clamp are arranged in opposite directions.

[0454] To solve the problems described in the fifteenth embodiment and keep the nut clamping tube (including the nut clamping tube with an outer diameter less than or equal to the aperture of the nut through-hole) inserted into the nut through-hole in a tubular 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 fifteenth, nineteenth, and twentieth embodiments.

[0455] In this embodiment, the nut clamping tube 2130 is a tubular 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 nut clamping tube 2130, the clamping tube walls 2131 and 2132 are arranged in opposite directions, so that at the adjacent joints of the nut 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 mutually hooked through the mountain-shaped tube wall structures to connect the adjacent clamping tube walls 2131 and 2132 at the adjacent joints, so that the nut clamping tube 1930 maintains a tubular structure state.

[0456] 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 fifteenth 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 nut clamping tube; as Figure 37 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'.

[0457] At each adjacent joint of the nut clamping tube, the side wall of an adjacent clamping tube wall is embedded in the groove of another adjacent clamping tube wall; the side wall of each clamping tube wall, its shape and size match the groove into which it is embedded. In this embodiment, the side wall 2137 of the clamping tube wall 2131, its shape and size match the groove 2136' of the clamping tube wall 2132 into which it is embedded. The side wall 2137 is embedded in the groove 2136' to form a complete tube wall structure with the groove 2136', which means that: in the circumferential direction of the tube wall, the arc length of the side wall 2137 = the arc length of the groove 2136'; in the direction of the nut clamping tube, the length of the side wall 2137 = the groove depth of the groove 2136'. Similarly, the side wall 2137' of the clamping tube wall 2132, its shape and size match the groove 2136 of the clamping tube wall 2131 into which it is embedded. The side wall 2137' is embedded in the groove 2136 to form a complete tube wall structure with the groove 2136, which means that: in the circumferential direction of the tube wall, the arc length of the side wall 2137' = the arc length of the groove 2136; in the direction of the nut clamping tube, the length of the side wall 2137' = the groove depth of the groove 2136.

[0458] At each end of the nut clamping tube, the base wall of an adjacent clamping tube wall is joined with the main wall of another adjacent clamping tube wall and forms a complete tube wall 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 nut clamping tube. In this embodiment, at one end of the nut clamping tube 2130, the base wall 2131x of the clamping tube wall 2131 is joined with the main wall 2132y of the clamping tube wall 2132 and forms a complete tube wall 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 nut clamping tube 2130; at the other end of the nut clamping tube 2130, the base wall 2132x of the clamping tube wall 2132 is joined with the main wall 2131y of the clamping tube wall 2131 and forms a complete tube wall 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 nut clamping tube 2130.

[0459] In the nut pipe clamp, the adjacent pipe clamp walls are arranged in opposite directions. In this embodiment, the pipe clamp walls 2131 and 2132 of the nut pipe clamp 2130 are arranged in opposite directions. In this way, at each adjacent joint of the nut pipe clamp 2130, the side wall 2137 is inserted into the groove 2136', the side wall 2137' is inserted into 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 pipe clamp walls 2131 and 2132 are mutually engaged through the mountain-shaped pipe wall structure to form a complete pipe wall. At the same time, along the circumferential direction of the pipe wall, the side wall 2137 (of the pipe clamp wall 2131) and the side wall 2137' (of the pipe clamp wall 2132) are mutually hooked, and the adjacent pipe clamp walls 2131 and 2132 are connected in the circumferential direction, so that the nut pipe clamp formed by the engagement maintains the pipe structure state, and its pipe structure is stably shaped and does not come loose.

[0460] In this embodiment, by designing the pipe clamp wall itself as a mountain-shaped pipe wall structure and arranging adjacent pipe clamp walls in opposite directions, the pipe clamp walls are mutually engaged to form a pipe structure, and are mutually hooked at the joints of the pipe clamp walls, so that the nut pipe clamp formed by the engagement maintains the pipe structure state, and its pipe structure is stably shaped and does not come loose. The technical solution provided in this embodiment has the same technical effect as that of Embodiment 15. For the relevant technical effects, reference can be made to Embodiment 17, and they will not be repeated here.

[0461] Embodiment 19

[0462] In Embodiment 1, when the fastening nut and the fastening bolt are screwed tightly, they will respectively clamp and press into the bulging part of the external pipe from both sides of the bulging part (or the connection part). The bulging part and the external pipe outside it are firmly pressed together, so as to fix the connection between the connecting pipe and the external pipe, and at the same time, a multiple seal is formed at the connection between the connecting pipe and the external pipe.

[0463] The main difference from Embodiment 1 is that in this Embodiment 19, the fastening nut and the fastening bolt have a third positioning structure for indicating the appropriate fastening position of the fastening nut and the fastening bolt; 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.

[0464] In Embodiment 1, the fastening nut and the fastening bolt are screwed tightly, so that on the first side of the bulging part, the fastening nut clamps and presses into the bulging part of the external pipe through the first clamping part 133, and presses the first bearing surface 112a and the external pipe 150 outside it tightly together to form a seal; on the second side of the bulging part, the fastening bolt clamps and presses into the bulging part of the external pipe through the second clamping part 141, and presses the second bearing surface 112b and the external pipe 150 outside it tightly together to form a seal.

[0465] The fastening nut and the fastening bolt 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 nut and the fastening bolt are not tightened enough, fluid leakage or even disconnection of the connection may occur; if the fastening nut and the fastening bolt are tightened too much, the device may be damaged. In addition, the fastening nut and the fastening bolt are threadedly connected, and the fastening bolt may become loose due to vibration during use.

[0466] To solve the above problems, to screw the fastening nut and the fastening bolt 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 nut and the fastening bolt to indicate the appropriate fastening position of the two.

[0467] 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 inner wall of the nut body and on the second side of the thread structure; the third positioning protrusion 2225 is a continuous or discontinuous annular protrusion provided on the bolt rod and on the second side of the thread structure of the fastening bolt.

[0468] At the connection between the connecting pipe and the external pipe, the fastening nut (specifically, the nut body 2240) and the fastening bolt 2220 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 nut and the fastening bolt. When the nut body 2240 and the fastening bolt 2220 are screwed tightly to the appropriate fastening position, on the first side of the bulging part, the fastening nut 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 bolt 2220 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.

[0469] At the same time, when the nut body 2240 and the fastening bolt 2220 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 bolt can be effectively prevented.

[0470] 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 38 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.

[0471] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation to 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 nuts, which can be put on the connecting pipe and are arranged on one side of the bulging part; the fastening nuts have a first clamping part, which is used to clamp and push the bulging part of the external pipe; A plurality of fastening bolts, which can be inserted into the outer tube and arranged on the other side of the bulging portion; the fastening bolts have a second clamping portion for clamping and pushing the bulging portion of the outer tube; The fastening bolt is threadedly connected with the fastening nut, and the two are respectively clamped and pushed into the bulging part of the external pipe from both sides of the bulging part, so as to fix the connection between the connecting pipe and the external pipe 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 nut 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 inner wall of the fastening nut is provided with a threaded structure to cooperate with the fastening bolt for threaded connection.

20. The pipe connection device according to claim 1, characterized in that: The fastening bolt comprises a bolt rod, a bolt head and a bolt through hole; The outer wall of the bolt rod is provided with a thread structure, which is located at the first end of the bolt rod and is used to cooperate with the fastening nut for threaded connection; The bolt head is located at the second end of the bolt shaft.

21. The pipe connection device according to any one of claims 10, 13, 14 or 20, characterized in that: The outer diameter of the external tube ≤ the inner diameter of the bolt through hole < the second composite outer diameter R2; The second composite outer diameter R2 is the maximum outer diameter at the bulging portion pressed into the outer tube; The second clamping portion is the first end of the fastening bolt, and the inner diameter of the second clamping portion is the inner diameter of the bolt through hole.

22. The pipe connection device according to claim 1, characterized in that: The fastening nut and the fastening bolt also have a third positioning structure for indicating the appropriate fastening position of the fastening nut and the fastening bolt; At the appropriate tightening position, the tightening nut and the tightening bolt fix 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 nut and the fastening bolt 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 second side of the thread structure of the fastening bolt; The third positioning protrusion is a continuous or discontinuous annular protrusion, which is arranged on the bolt rod and located on the second side of the threaded 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 nuts and the fastening bolts is determined according to the number of the connecting pipes or the bulging parts.

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

29. The clamping nut according to claim 28, wherein: Each fastening nut comprises a nut body and a nut clamp tube; A nut through hole is provided inside the nut body, and the nut clamping tube is placed in the nut through hole; The nut body can be inserted from the second end of the connecting tube, through the bulging part, and onto the non-bulging part; the nut 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 clamping nut according to claim 29, wherein: The nut clamp tube is formed by splicing or embedding two or more clamp tube walls; Each clamping tube wall of the nut 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 clamping nut according to claim 29, wherein: The nut clamp tube is formed by splicing a tube structure with a tube seam; The pipe seam is arranged along the direction where the nut clamps the pipe.

32. The clamping nut according to claim 29, wherein: The nut through hole is arranged along the direction of the fastening nut and penetrates the nut body; The diameter of the nut through hole is greater than the maximum outer diameter of the bulging portion.

33. The clamping nut according to claim 29, wherein: A thread structure is provided on the inner wall of the nut body. The thread structure is located at the second end of the nut body and is used to cooperate with the thread structure of the fastening bolt for threaded connection.

34. The clamping nut according to claim 33, characterized in that The nut body also has a limiting portion; The limiting portion is located inside the nut through hole and on the first side of its thread structure; The limiting portion is used for bearing the nut clamping tube.

35. The clamping nut according to claim 34, wherein: 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 nut 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 nut through hole.

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

37. The clamping nut 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 inner diameter of the nut clamp tube ≥ the diameter of the center hole.

38. The clamping nut according to claim 37, wherein: The entire end surface of the first end of the nut clamping tube is located on the limiting body.

39. A clamping nut 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 nut 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 clamping nut according to claim 39, wherein: By setting marks at visible positions of the nut 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 clamping nut according to claim 39, wherein: 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 tube clamping wall is located at at least one through hole, and each tube clamping wall corresponds to at least one through hole; wherein N is a positive integer, N×min(L1)≥the circumference of the nut clamping tube>(N-1)×min(L1), and min(L1) is the arc length of the tube clamping wall with the smallest arc length among all the tube clamping walls that are assembled to form the nut clamping tube.

42. The clamping nut 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 nut clamp tube.

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

44. The clamping nut 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 nut 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 nut clamp tube ≥ the diameter of the center hole.

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

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

47. A clamping nut according to any one of claims 30 or 44, characterized in that When the nut clamp is formed by splicing or chiseling 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 nut clamping tube, so that each clamping wall has at least one convex tooth to carry it.

48. The clamping nut 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 nut 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 clamping nut 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 nut 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 nut clamp tube.

50. The clamping nut according to claim 49, wherein: The outer end surface of the first end of the nut clamp tube is located on the limiting body, and the inner end surface is located in the center hole.

51. A clamping nut as claimed in any one of claims 31 or 50, characterized in that When the nut 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 clamping nut according to any one of claims 30 or 50, characterized in that When the nut clamp is formed by splicing or chiseling 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 nut clamping tube, so that each clamping wall has at least one convex tooth to carry it.

53. The clamping nut 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 clamping nut according to claim 34, wherein: The tube length of the nut clamp tube is less than or equal to the maximum tube length of the non-bulging part between the nut body sleeved on the non-bulging part and the bulging part.

55. The clamping nut according to claim 28, wherein: 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.

56. The clamping nut according to claim 55, 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.

57. The clamping nut according to claim 29, wherein: The outer diameter of the nut clamp tube is ≤ the diameter of the nut through hole; The inner diameter of the nut 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 pressed into the outer tube.

58. A clamping nut as claimed in any one of claims 55 or 57, characterized in that When the inner diameter of the nut clamp tube is less than the second composite outer diameter R2, the first clamping portion may be the second end of the nut clamp tube; wherein the second composite outer diameter R2 is the maximum outer diameter of the bulging portion pressed into the external tube.

59. The clamping nut according to claim 55, characterized in that The first clamping portion is a circular ring structure disposed in the nut 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 nut 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.

60. The clamping nut according to claim 57, wherein: When the outer diameter of the nut clamp tube equals the aperture of the nut through hole, the nut body clamps the nut clamp tube formed by the splicing through its inner wall, so that the nut clamp tube maintains the tube structure state; When the outer diameter of the nut clamp tube is less than the aperture of the nut through hole, a tightening structure is provided on the outer wall of the nut clamp tube, and the outer diameter of the tightening structure is equal to the aperture of the nut through hole. The nut body tightens the tightening structure through its inner wall to keep the nut clamp tube in a tube structure state.

61. The clamping nut according to claim 60, 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.

62. The clamping nut according to claim 60, characterized in that The clamping structure is arranged at the second end of the nut clamping tube.

63. The clamping nut according to claim 30, characterized in that The nut clamp tube has a first positioning structure for positioning adjacent clamp tube walls at adjacent locations so that both ends of the two adjacent clamp tube 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.

64. The clamping nut according to claim 63, characterized in that At the adjoining part of the nut clamp tube, the setting position, quantity and shape of the positioning pins on the side surface of one adjacent clamp tube wall match the setting position, quantity and shape of the positioning grooves on the side surface of another adjacent clamp tube wall.

65. The clamping nut according to claim 30, wherein: Each clamping tube wall is provided with a concave-convex structure; At each adjacent part of the nut clamp tube, the concave-convex structures of adjacent clamp tube walls are interlocked to form a complete tube wall at the interlocking part; at the same time, the concave-convex structures of adjacent clamp tube walls also bite or hook each other to form a connection between adjacent clamp tube walls and keep the nut clamp tube in a tube structure state.

66. The clamping nut according to claim 65, characterized in that At each adjacent part of the nut clamp tube, the concave-convex structure of an adjacent clamp tube wall is a groove opened on the side surface, the groove extends along the direction of the nut clamp tube, and its extension length is equal to the length of the nut clamp tube; The concave-convex structure of another adjacent clamping tube wall is a convex block arranged on the side surface, the convex block extends along the direction of the nut clamping tube, and its extension length is equal to the tube length of the nut clamping tube; or, The concave-convex structure of another adjacent clamping tube wall is a plurality of protrusions arranged on the side surface, the plurality of protrusions are distributed along the direction of the nut clamping tube, and a protrusion is arranged at the second end of the nut clamping tube, each protrusion extends along the direction of the nut clamping tube, and its extension length is less than the length of the nut clamping tube.

67. The clamping nut according to claim 65, characterized in that At each adjacent part of the nut clamp tube, the concave-convex structure of an adjacent clamp tube wall is a plurality of grooves opened on the side surface, the plurality of grooves are distributed along the direction where the nut clamp 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 clamping tube wall is a plurality of protrusions arranged on the side surface, the plurality of protrusions are distributed along the direction of the nut clamping tube, each protrusion extends along the direction of the tube diameter, and its extension length is equal to the tube wall thickness.

68. A clamping nut as claimed in any one of claims 66 or 67, characterized in that At each adjacent position of the nut 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.

69. The clamping nut according to claim 67, characterized in that At each adjacent part of the nut clamping tube, the number and arrangement position of the projections on the side of an adjacent clamping tube wall correspond to the grooves on the side of another adjacent clamping tube wall.

70. The clamping nut according to any one of claims 66 or 67, 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.

71. A clamping nut as claimed in claim 70, characterized in that The groove also has an end, and the protrusion is embedded in the groove from the end of the groove.

72. The clamping nut according to claim 68, wherein: 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.

73. A clamping nut as claimed in any one of claims 66 or 67, 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.

74. The clamping nut according to claim 65, characterized in that At each adjacent part of the nut 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, which extends along the direction of the nut clamp tube, and the extension length is equal to the length of the nut clamp tube; The concave-convex structure of another adjacent clamping tube wall is a groove opened on the outer wall, and the groove is the second groove. The second groove extends along the direction of the nut clamping tube, and the extension length is equal to the tube length of the nut clamping tube.

75. A clamping nut as claimed in claim 74, characterized in that At each adjacent part of the nut 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 wall of the first groove, its shape and size are matched with the second groove into which it is inserted, and a complete pipe wall is formed at the fitting position; The outer wall of the second groove, its shape and size are matched with the first groove into which it is inserted, and a complete pipe wall is formed at the fitting position.

76. The fastening nut according to claim 74, wherein The first groove is formed by recessing from the inner wall of the clamping pipe wall along the pipe diameter direction towards the outer wall, and has 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; The second groove is formed by recessing from the outer wall of the clamping pipe wall along the pipe diameter direction towards the inner wall, and has 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.

77. The fastening nut according to claim 76, wherein The first groove or the second groove further has a port; The outer wall of the first groove is inserted into the second groove from the port of the second groove; The outer wall of the second groove is inserted into the first groove from the port of the first groove.

78. The fastening nut according to claim 75, wherein The shape of each outer wall and the groove fitted 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 claw shape, a Christmas tree shape.

79. A clamping nut as claimed in any one of claims 77 or 78, characterized in that When the shape of each outer wall and the groove fitted therewith is a rectangle, each outer wall can also be inserted into the groove from the notch.

80. The fastening nut according to claim 74, wherein First grooves are provided on the inner walls on both sides of the clamping pipe wall as the concave-convex structure; or, Second grooves are provided on the outer walls on both sides of the clamping pipe wall as the concave-convex structure; or, First grooves are provided on the inner walls on one side of the clamping pipe wall as the concave-convex structure, and second grooves are provided on the outer walls on the other side as the concave-convex structure.

81. The fastening nut according to claim 65, wherein Each clamping pipe wall of the nut clamping pipe 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 clamping pipe walls in the nut clamping pipe are arranged in opposite directions.

82. The fastening nut according to claim 81, 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 respectively provided at both ends. Grooves are respectively formed between the main wall and the side walls on both sides thereof. The sum of the lengths of the base wall and the main wall is the pipe length of the nut clamping pipe.

83. The fastening nut according to claim 82, wherein At each adjacent position of the nut clamping pipe, the side wall of one adjacent clamping pipe wall is inserted into the groove of the other adjacent clamping pipe wall; The shape and size of each side wall are matched with the groove into which it is inserted, and a complete pipe wall is formed at the fitting position.

84. The fastening nut according to claim 82, wherein At each end of the nut 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 joining position; Meanwhile, the sum of the arc lengths of each base wall and each main wall at this end is equal to the circumference of the nut clamping pipe.

85. A pipe connection method, applicable to the pipe connection device according to any one of claims 1 to 27, characterized in that: Including the following steps: The nut body passes through the bulging part from the second end of the connecting pipe and is sleeved on the non-bulging part; The fastening bolt is sleeved on the outer pipe; 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 bolt is located on the second side of the bulging portion; The nut clamp is installed in the nut body to form a fastening nut; the formed fastening nut is sleeved on the non-bulging part and is located on the first side of the bulging part; The fastening nuts and fastening bolts on both sides of the bulging part are screwed tight, and the fastening nuts and fastening bolts 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.

86. The pipe connection method according to claim 85, characterized in that: At the non-bulging portion between the nut body and the bulging portion, each clamping tube wall surrounds the non-bulging portion or the outer tube of its outer layer to form a nut clamping tube, and the nut clamping tube is installed into the nut through hole along the non-bulging portion to form a fastening nut; or, At the non-bulging portion between the nut body and the bulging portion, each clamping tube wall is respectively installed into the nut body along the non-bulging portion, and is assembled in the nut through hole to form a nut clamping tube and a fastening nut.

87. The pipe connection method according to claim 85, characterized in that: At the non-bulging part between the nut body and the bulging part, the pipe seam of the nut clamping tube is stretched open, the nut clamping tube is wrapped around the non-bulging part or the outer tube of its outer layer, and the nut clamping tube is installed into the nut through hole along the non-bulging part to form a tightening nut.

88. The pipe connection method according to claim 85, characterized in that: Tighten the fastening nuts and fastening bolts to a moderately tight position.

89. A pipe disassembly method, applicable to the pipe connection device according to any one of claims 1 to 27, characterized in that: The steps include: The fastening nuts and fastening bolts are screwed loose; The connecting pipe is withdrawn from the external pipe and is disassembled from the external pipe; The fastening nut is separated from the bulging portion along the non-bulging portion, and the nut clamping tube or the clamping tube wall thereof is removed from the nut through hole; The nut body is removed from the second end of the connecting pipe through the bulging portion; Remove the fastening bolts from the outer tube.

90. The disassembly method according to claim 89, characterized in that: Push the nut clamp tube out of the nut body, disassemble the adjacent clamp tube walls, and remove the nut clamp tube from the non-bulging part; or, Push the clamp tube wall out of the nut body and remove it from the non-bulging part.

91. The pipe disassembly method of claim 89, wherein: Push the nut clamp tube out of the nut body, open the tube slit of the nut clamp tube, and remove the nut clamp tube from the non-bulging part.

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