Pipe docking kit, pipe docking structure and pipe docking method

Abstract

The present invention discloses a pipeline docking kit, a pipeline docking structure and a pipeline docking method. The pipeline docking kit mainly includes a pipe end sleeve. The pipe end sleeve includes an inner support body, an outer sleeve body and an end sealing plate. Both the inner support body and the outer sleeve body are circular ring bodies, and the outer diameter of the inner support body is smaller than that of the outer sleeve body. The ends of the inner support body and the outer sleeve body are connected by the end sealing plate, so that a pipeline groove with a U-shaped structure is formed between the inner support body and the outer sleeve body. When the pipe end sleeve is used for pipeline docking, the pipe body end of the pipeline to be docked is clamped into the pipeline groove, so that the end face of the pipe body is covered by the pipe end sleeve. Together with the sealing of the sealing ring, the end face cut of the pipe body end is prevented from contacting the liquid flowing in the pipeline, thereby avoiding the problem that the end face cut of the pipeline end is corroded.

Description

Technical Field

[0001] The present invention relates to an inter-pipe butt joint structure. Background Art

[0002] In order to improve the quality of drinking water and prevent some harmful elements to human body from entering the drinking water due to the long-term corrosion of the inner wall of metal pipe fittings by water, which endangers human health, metal composite water conveyance pipes have been widely used. At present, the connection of reinforced stainless steel pipes (or stainless steel-lined composite pipes or steel-plastic composite pipes) with a nominal size of not less than DN50 generally adopts the method of grooved clamp connection. This connection method is safe and reliable, and the construction is simple with low construction cost. However, stainless steel-lined composite steel pipes or reinforced stainless steel pipes are a new type of composite steel pipes. Directly adopting the traditional grooved clamp connection method cannot prevent their end faces from contacting the conveying medium water. After the end faces contact the conveying medium water, the end faces are corroded, polluting the drinking water, resulting in unqualified sanitary conditions of the drinking water. At the same time, the corrosion will cause water leakage accidents, greatly shortening the service life of the composite pipes. The same problem exists when other metal composite pipes adopt grooved connection. Summary of the Invention

[0003] The problem to be solved by the present invention: to avoid the problem of corrosion of the end face cut of the pipe end during pipe butt joint.

[0004] To solve the above problems, the following solution is adopted in the present invention:.

[0005] According to the pipe butt joint kit of the present invention, it includes a pipe end sleeve, a clamp and a first sealing ring; the pipe end sleeve is used to be arranged at the end of the pipe body of the pipe to be butted, and includes an inner support body for attaching to the inner surface of the pipe body of the pipe to be butted, an outer sleeve body for attaching to the outer surface of the pipe body of the pipe to be butted, and an end sealing plate connecting the inner support body and the outer sleeve body; both the inner support body and the outer sleeve body are circular ring bodies, and the outer diameter of the inner support body is smaller than that of the outer sleeve body; the ends of the inner support body and the outer sleeve body are connected by the end sealing plate, so that a U-shaped pipe groove is formed between the inner support body and the outer sleeve body; the pipe groove is used for the end of the pipe body of the pipe to be butted to be inserted; the clamp is used to be clamped between the pipe bodies of two pipes to be butted during the butt joint of the pipe bodies of the pipes to be butted, and covers the outer sleeve body of the pipe end sleeve, and includes a groove on the inner side; the first sealing ring is used to be arranged in the groove and clamped on the outer sleeve body to realize the sealing of the pipe bodies of two pipes to be butted.

[0006] Further, for the pipe butt joint kit according to the present invention, the pipe end sleeve is made of metal or alloy.

[0007] Further, for the pipe butt joint kit according to the present invention, the first sealing ring includes a balance cavity; the balance cavity is covered by a cortex to form an annular structure; a notch is provided in the middle of the inner side of the balance cavity; on both sides of the notch are annular cortex pressing plates; the cortex pressing plates are used to press on the outer sleeve body.

[0008] Furthermore, for the pipe docking kit according to the present invention, the axial length of the outer sleeve satisfies the following condition: W5÷2>L2>(W5-4×H-W6max)÷2; where L2 is the axial length of the outer sleeve, W5 is the groove width of the groove, H is the thickness of the cortex of the first sealing ring, and W6max is the maximum value allowed for the seam width between two pipes to be docked when the two pipes to be docked are docked.

[0009] Furthermore, for the pipe docking kit according to the present invention, it further includes a second sealing ring; an annular sealing groove is provided on the outer cylindrical surface of the inner support body; the second sealing ring is used to be arranged in the sealing groove.

[0010] Furthermore, for the pipe docking kit according to the present invention, there are multiple sealing grooves.

[0011] Furthermore, for the pipe docking kit according to the present invention, the axial length of the inner support body is greater than that of the outer sleeve such that the inner support body has a protruding portion that axially protrudes from the outer sleeve; the sealing groove is arranged on the protruding portion.

[0012] Furthermore, for the pipe docking kit according to the present invention, the width W2 of the sealing groove is 3.0~20.0 mm.

[0013] Furthermore, for the pipe docking kit according to the present invention, the first sealing ring includes a balance cavity; the balance cavity is coated with a cortex to form an annular structure; a notch is provided in the middle of the inner side of the balance cavity; on both sides of the notch are annular cortex pressing plates; the cortex pressing plates are used to press against the outer sleeve; the axial distance between the sealing groove and the outer sleeve is less than 2×H; where H is the thickness of the cortex of the first sealing ring.

[0014] Furthermore, for the pipe docking kit according to the present invention, the sealing groove is formed by merging multiple groove bodies.

[0015] According to the pipe docking structure of the present invention, it includes a clamp, a first sealing ring, and the pipe bodies of two pipes to be docked; pipe end sleeves are respectively arranged at the end portions of the docking ends of the pipe bodies of the two pipes to be docked; the pipe end sleeve includes an inner support body, an outer sleeve, and an end sealing plate; both the inner support body and the outer sleeve are circular ring bodies, and the outer diameter of the inner support body is smaller than that of the outer sleeve; the inner support body and the outer sleeve are connected at the end by the end sealing plate such that a U-shaped pipe groove is formed between the inner support body and the outer sleeve; the end portions of the pipe bodies of the pipes to be docked are snapped into the pipe groove, the end faces of the pipe bodies are covered by the pipe end sleeve, and the inner support body is attached to the inner surface of the pipe body of the pipe to be docked, and the outer sleeve is attached to the outer surface of the pipe body of the pipe to be docked; a clamping groove is provided at the end portion of the pipe body; the clamp includes a groove on the inner side; the edge portions on both sides of the groove are respectively clamped in the clamping grooves on the pipe bodies of the two pipes to be docked such that the clamp covers the outer sleeve; the first sealing ring is arranged in the groove and is clamped between the clamp and the outer sleeve.

[0016] Furthermore, for the pipe docking structure according to the present invention, the pipe end sleeve is made of metal or alloy.

[0017] Furthermore, for the pipe docking structure according to the present invention, the first sealing ring includes a balance cavity; the balance cavity is covered by a cortex to form an annular structure; a notch is provided in the middle of the inner side of the balance cavity; both sides of the notch are annular cortex pressing plates; the notch faces the joint between the two pipes to be docked; the cortex pressing plate presses on the outer sleeve body.

[0018] Furthermore, for the pipe docking structure according to the present invention, the axial length of the outer sleeve body satisfies the following condition: W5÷2>L2>(W5-4×H-W6max)÷2; where L2 is the axial length of the outer sleeve body, W5 is the groove width of the groove, H is the thickness of the cortex of the first sealing ring, and W6max is the maximum value allowed for the joint width W6.

[0019] Furthermore, for the pipe docking structure according to the present invention, it further includes a second sealing ring; an annular sealing groove is provided on the outer cylindrical surface of the inner support body; the second sealing ring is arranged in the sealing groove.

[0020] Furthermore, for the pipe docking structure according to the present invention, there are multiple sealing grooves.

[0021] Furthermore, for the pipe docking structure according to the present invention, the axial length of the inner support body is greater than that of the outer sleeve body such that the inner support body has a protruding portion axially protruding from the outer sleeve body; the sealing groove is arranged on the protruding portion.

[0022] Furthermore, for the pipe docking structure according to the present invention, the clamping groove is roll-formed. When the clamping groove is roll-formed, the pipe body is recessed inward to form an inner convex portion inside the pipe body; the inner convex portion is snapped into the sealing groove.

[0023] Furthermore, for the pipe docking structure according to the present invention, the width W2 of the sealing groove is 3.0~20.0 mm.

[0024] Furthermore, for the pipe docking structure according to the present invention, the first sealing ring includes a balance cavity; the balance cavity is covered by a cortex to form an annular structure; a notch is provided in the middle of the inner side of the balance cavity; both sides of the notch are annular cortex pressing plates; the notch faces the joint between the two pipes to be docked; the cortex pressing plate presses on the outer sleeve body; the axial distance between the sealing groove and the outer sleeve body is less than 2×H; where H is the cortex thickness of the first sealing ring.

[0025] Furthermore, for the pipe docking structure according to the present invention, it is formed by combining multiple grooves; a second sealing ring is respectively arranged in each groove.

[0026] For the pipe docking method according to the present invention, this method relates to the aforementioned pipe docking kit, and this method includes the following steps:

[0027] S1: Fit the second sealing ring into the sealing groove;

[0028] S2: Insert the pipe end sleeve with the second sealing ring into the pipe end of the pipe body to be butt - jointed, so that the end of the pipe body to be butt - jointed is clamped into the pipe groove. The end face of the butt - jointed end of the pipe body is covered by the pipe end sleeve, and the inner support body is attached to the inner surface of the pipe body to be butt - jointed, and the outer sleeve body is attached to the outer surface of the pipe body to be butt - jointed;

[0029] S3: Roll a clamping groove at the end of the pipe body to be butt - jointed by a grooving machine. When rolling the clamping groove, face the sealing groove, so that the pipe body is recessed inward to form an inner convex part inside the pipe body to be clamped into the sealing groove, compressing the second sealing ring in the sealing groove;

[0030] S4: Put the first sealing ring on the pipe body of one of the pipes to be butt - jointed. After the pipe ends of the two pipes to be butt - jointed are aligned, move the first sealing ring to the joint between the pipe bodies of the two pipes to be butt - jointed, and make the center of the first sealing ring align with the joint, so that the first sealing ring is clamped on the outer sleeve body;

[0031] S5: Buckle the two semi - circular parts of the clamp on the first sealing ring so that the first sealing ring is located in the groove of the clamp, and the two side parts on both sides of the groove are respectively clamped in the clamping grooves on the pipe bodies of the two pipes to be butt - jointed. Then, fasten the two semi - circular parts of the clamp with bolts to complete the butt - joint of the two pipes to be butt - jointed.

[0032] Furthermore, according to the pipe butt - jointing method of the present invention, in the step of S2, when the pipe end sleeve is inserted into the pipe end of the pipe body to be butt - jointed, the end face of the butt - jointed end of the pipe body abuts against the end sealing plate;

[0033] Furthermore, according to the pipe butt - jointing method of the present invention, the first sealing ring includes a balance cavity; the balance cavity is covered by a cortex to form an annular structure; a notch is provided in the middle of the inner side of the balance cavity; the two sides of the notch are annular cortex pressing plates; in the step of S4, when the first sealing ring is moved to the joint between the pipe bodies of the two pipes to be butt - jointed, the notch is aligned with the joint.

[0034] Furthermore, according to the pipe butt - jointing method of the present invention, the length of the outer sleeve body satisfies the following condition: L2 > W5 - 4H - W6max / 2; where L2 is the length of the outer sleeve body, W5 is the groove width of the groove, H is the thickness of the cortex of the first sealing ring, and W6max is the maximum value allowed for the joint width W6; in the step of S3, when rolling the clamping groove, roll the clamping groove along the end of the outer sleeve body so that the edge of the clamping groove is aligned with the outer sleeve body.

[0035] The technical effects of the present invention are as follows: The pipe end sleeve of the present invention can be sleeved on the pipe end to be butt - jointed, avoiding the end face cut of the pipe body from contacting the liquid flowing in the pipe, thereby avoiding the problem of corrosion of the end face cut of the pipe end. Brief Description of the Drawings

[0036] Figure 1 It is a schematic structural diagram of an embodiment of the pipeline docking structure of the present invention.

[0037] Figure 2 is Figure 1 an enlarged view of the dotted circle part in

[0038] Figure 3 and Figure 4 are respectively schematic three-dimensional structural diagrams of two different perspectives of an embodiment of the pipe end sleeve.

[0039] Figure 5 is a diagram defining the dimensions of the pipe end sleeve component.

[0040] Figure 6 is Figure 2 a diagram defining the dimensions of each component in

[0041] Figure 7 It is a schematic structural diagram of another embodiment of the pipeline docking structure of the present invention.

[0042] Figure 8 is a semi-sectional schematic three-dimensional structure diagram of the first sealing ring.

[0043] Figure 9 is a schematic structural diagram of the pipe end sleeve in Embodiment 4.

[0044] Figure 10 is a schematic structural diagram of the pipe end sleeve in Embodiment 4 installed on the pipeline to be docked.

[0045] In the above figures,

[0046] 1 is the pipe end sleeve, 11 is the inner support body, 111 is the sealing groove, 1111 is the first sealing groove, 1112 is the second sealing groove, 11P is the protruding part, 12 is the outer sleeve body, 13 is the end sealing plate, 14 is the pipeline groove, 15 is the pipe cavity, 2 is the clamp, 21 is the groove, 22 is the edge part, 3 is the first sealing ring, 31 is the balance cavity, 32 is the notch, 33 is the cortical pressing plate, 33P is the state where the cortical pressing plate warps, 4 is the second sealing ring, 5 is the pipe body of the pipeline to be docked, 51 is the clamping groove, 52 is the inner convex part, 6 is the joint;

[0047] L1 is the axial length of the inner support body, L2 is the axial length of the outer sleeve body, L3 is the axial length of the protruding part, L4 is the axial distance between the sealing groove and the outer sleeve body, W1 is the width of the pipeline groove, W2 is the width of the sealing groove, W3 is the width of the clamping groove, W4 is the width of the edge part of the clamp, W5 is the width of the groove, W6 is the width of the joint, D is the clearance width between the edge part of the clamp and the outer sleeve body, and H is the cortical thickness of the first sealing ring.

[0048] In the above figures, the dashed lines shown radially indicate that the radial dimension of the actual product is generally larger than the dimension shown in the figures, and the radial dimension shown in the figures cannot be compared with other dimensions shown in the figures. Detailed implementation mode

[0049] The present invention will be further described in detail below with reference to the accompanying drawings.

[0050] Embodiment 1

[0051] This embodiment is a pipeline docking structure. Referring to Figure 1 and Figure 2 , it includes a clamp 2, a first sealing ring 3, the pipe bodies 5 of two pipes to be docked, and two pipe end sleeves 1. The two pipe end sleeves 1 are respectively sleeved on the ends of the pipe bodies 5 of the two pipes to be docked, and are used to protect the end faces of the pipe bodies 5.

[0052] Referring to Figure 3 , Figure 4 and Figure 5 , the pipe end sleeve 1 includes an inner support body 11, an outer sleeve body 12, and an end sealing plate 13. The inner support body 11 and the outer sleeve body 12 are both annular bodies. The ends of the inner support body 11 and the outer sleeve body 12 are connected by the end sealing plate 13, so that the inner support body 11, the outer sleeve body 12, and the end sealing plate 13 are connected into an integrated structure. In this integrated structure, the inner support body 11, the outer sleeve body 12, and the end sealing plate 13 are coaxial, and there is a pipe cavity 15 constructed by the inner support body 11 in the middle. This integrated structure is made of metal or alloy as a whole, especially hard metal or hard alloy, preferably stainless steel or copper. The outer diameter of the inner support body 11 is smaller than that of the outer sleeve body 12, so that a U-shaped pipe groove 14 is formed between the inner support body 11 and the outer sleeve body 12. The pipe groove 14 is an annular U-shaped groove and is open axially. The pipe end sleeve 1 is sleeved on the end of the pipe body 5 of the pipe to be docked, so that the end of the pipe body 5 is covered by the inner support body 11, the outer sleeve body 12, and the end sealing plate 13 of the pipe end sleeve 1. Thus, by covering the end of the pipe body 5 with the pipe end sleeve 1, it is possible to prevent the fluid in the docked pipeline from contacting the end face of the pipe body 5 of the pipe to be docked, thereby also avoiding the problem of corrosion of the end face of the pipe body 5. More specifically, the inner support body 11 is attached to the inner surface of the pipe body 5 of the pipe to be docked, and the outer sleeve body 12 is attached to the outer surface of the pipe body 5 of the pipe to be docked. The end pipe body of the pipe body 5 to be docked is clamped into the pipe groove 14. When the end pipe body of the pipe body 5 to be docked is clamped into the pipe groove 14, the end face of the pipe body 5 to be docked usually abuts against the end sealing plate 13. Those skilled in the art understand that the end face of the docked pipe body 5 may not abut against the end sealing plate 13. In addition, under the above structure, it is obvious that the width W1 of the pipe groove 14 should match the wall thickness of the pipe body 5 of the pipe to be docked.

[0053] A clamping groove 51 is provided at the end of the pipe body 5. The clamp 2 is a grooved clamp, that is, the clamp 2 includes an inner groove 21. The side parts 22 on both sides of the groove 21 are respectively clamped in the clamping grooves 51 on the pipe bodies 5 of the two pipes to be butted, so that the clamp 2 covers the outer sleeve 12. The first sealing ring 3 is arranged in the groove 21 and is clamped between the clamp 2 and the outer sleeve 12.

[0054] The pipe docking structure of this embodiment is a copyring type pipe docking structure, that is, a certain degree of axial movement is allowed between the two pipes to be butted. Specifically in the above structure, that is, there is a joint 6 left between the ends of the pipe bodies 5 of the two pipes to be butted, and a certain width of the joint 6 is allowed. That is, referring to Figure 6 , the width W6 of the joint 6 can be greater than zero. Correspondingly, the first sealing ring 3 is a copyring type sealing ring. That is, referring to Figure 8 , the first sealing ring 3 has an annular balance cavity 31. The balance cavity 31 is formed by an annular structure covered by a cortex. A notch 32 is provided in the middle of the inner side of the balance cavity 31. The two sides of the notch 32 are annular cortex pressing plates 33. The notch 32 is directly opposite to the joint 6. The cortex pressing plates 33 on both sides of the notch 32 press against the outer sleeve 12. The sealing principle of this pipe docking structure is as follows: If there is fluid in the pipe, the fluid enters the balance cavity 31 through the joint 6 and the notch 32. Under the action of the fluid pressure, the cortex pressing plates 33 on both sides of the notch 32 are attached to the outer sleeve 12, so as to realize the sealing of the pipe bodies of the two pipes to be butted. Of course, those skilled in the art understand that the width W6 of the joint 6 can also be 0. In this case, the end sealing plates 13 of the two pipe end sleeves 1 provided at the ends of the two pipes to be butted are attached to each other. In this case, the end face of the pipe body end docking is naturally sealed.

[0055] Furthermore, in order to prevent the fluid in the pipe from flowing out through the gap between the pipe end sleeve 1 and the pipe body 5, a second sealing ring 4 can also be provided between the pipe end sleeve 1 and the pipe body 5. Specifically in this embodiment, in order to facilitate the setting of the second sealing ring 4, an annular sealing groove 111 is provided on the outer cylindrical surface of the inner support body 11 in this embodiment. The sealing groove 111 is used to set the second sealing ring 4. The sealing groove 111 can be formed by rolling with a grooving machine, or by machining with a milling machine, or by casting demoulding. The cross-sectional structural shape thereof is not limited. During installation or assembly, first, the second sealing ring 4 is snapped into the sealing groove 111, and then the pipe end sleeve 1 with the second sealing ring 4 and the pipe body 5 are snapped together.

[0056] Further, in order to improve the sealing effect of the second sealing ring 4, the clamping groove 51 at the end of the pipe body 5 of the pipe to be butt-jointed is rolled by a grooving machine. The position of the clamping groove 51 corresponds to the position of the sealing groove 111. After the pipe end sleeve 1 and the pipe body 5 are engaged, the clamping groove 51 is rolled by a grooving machine, so that the pipe body 5 is recessed inward to form an inner convex part 52 inside the pipe body. The inner convex part 52 is pressed into the sealing groove 111, thereby compressing the second sealing ring 4 arranged in the sealing groove 111. At the same time, the inner convex part 52 of the pipe end sleeve 1 clamped into the sealing groove 111 is clamped at the end of the pipe body 5 of the pipe to be butt-jointed, realizing the fixed connection between the pipe end sleeve 1 and the pipe body 5 of the pipe to be butt-jointed.

[0057] To implement the above connection structure, obviously, it is required that the axial length of the inner support body 11 is greater than that of the outer sleeve body 12. That is, referring to Figure 5 , the axial length L1 of the inner support body 11 is greater than the axial length L2 of the outer sleeve body 12, so that the inner support body 11 has a protruding part 11P protruding axially from the outer sleeve body 12. The axial length of the protruding part 11P is L3. Obviously, L1 = L2 + L3. The sealing groove 111 is arranged on the protruding part 11P.

[0058] In addition, since the pipe docking structure of this embodiment adopts a copy ring type docking structure, a certain degree of axial displacement is allowed between the two pipe bodies 5 to be butt-jointed after docking. Therefore, the width W3 of the clamping groove 51 is required to be greater than the width W4 of the edges on both sides of the groove of the clamp 2. And obviously, the width W2 of the sealing groove 111 is required not to be less than the width W4 of the clamping groove 51. That is to say, the sealing groove 111 is required to have a certain width, generally requiring W2 to be not less than 3.0 mm. On the other hand, the axial displacement allowed between the two pipe bodies 5 to be butt-jointed after docking cannot be too large, which requires that the width W3 of the clamping groove 51 cannot be too wide, and correspondingly, the width W2 of the sealing groove 111 cannot be too wide either. The width W2 of the sealing groove 111 is generally required not to exceed 20.0 mm. That is, the width W2 of the sealing groove 111 is preferably 3.0 - 20.0 mm.

[0059] Of course, those skilled in the art understand that the clamping groove 51 can also be machined by a milling machine. In this case, the corresponding position of the inner wall of the clamping groove 51 will not be recessed inward, nor will the second sealing ring 4 be compressed. In this case, the second sealing ring 4 can be in interference fit with the inner wall of the pipe 5 to be butt-jointed. For example, referring to Figure 7 In the structure shown in the example, the wall thickness of the pipe body 5 is relatively thick, the clamping groove 51 is machined by a milling machine, and there is no inward protrusion on the inner side of the pipe wall corresponding to the clamping groove 51. When the pipe end sleeve 1 is installed at the end of the pipe body 5, it is clamped into the pipe cavity of the pipe body 5 by the interference fit of the inner support body 11 and the second sealing ring 4, thereby realizing the mutual fixation among the pipe end sleeve 1, the pipe body 5 and the second sealing ring 4.

[0060] In addition, in the above-described embodiment, the outer sleeve 12 is attached to the outer surface of the pipe body 5, so a stepped structure is formed between the outer sleeve 12 and the pipe body 5. When the axial length L2 of the outer sleeve 12 is small, that is, referring to Figure 6 , there is a clearance width D between the edge portion 22 of the clamp 2 and the outer sleeve 12. A part of the cortical pressing plate 33 of the first sealing ring 3 is attached to the outer surface of the pipe body 5. Due to the stepped structure between the outer sleeve 12 and the pipe body 5, it is easy to cause the cortical pressing plate 33 to warp, referring to the state of the cortical pressing plate 33 indicated by the dotted line portion pointed to by the reference numeral 33P in the attached drawing shown in Figure 6 . Obviously, in this case, the cortical pressing plate 33 cannot be attached to the outer sleeve 12, and there is a possibility of liquid leakage in the seal of the first sealing ring 3.

[0061] To avoid the above problems, it is required that the clearance width D between the edge portion 22 of the clamp 2 and the outer sleeve 12 be as small as possible. For example, in the structure shown in Figure 7 , the clearance width D between the edge portion 22 and the outer sleeve 12 is small enough that the cortical pressing plate 33 of the first sealing ring 3 cannot be caught in the clearance between the edge portion 22 and the outer sleeve 12. To make the cortical pressing plate 33 of the first sealing ring 3 unable to be caught in the clearance between the edge portion 22 and the outer sleeve 12, it is required that the clearance width D satisfy the condition: D < 2×H, where H is the cortical thickness of the first sealing ring 3. On the other hand, as shown in Figure 6 , there is the following relationship between the width W5 of the groove 21 and the axial length L2 of the outer sleeve 12: W5 = 2×L2 + W6 + 2×D. That is, L2 = (W5 - W6 - 2×D)÷2. Since the clearance width needs to satisfy the condition: D < 2×H, therefore, L2 needs to satisfy the condition: L2 > (W5 - W6 - 4×H)÷2. That is, the axial length L2 of the outer sleeve 12 needs to be long enough to make the clearance width D between the edge portion 22 and the outer sleeve 12 small enough. In the above formula, W6, as the width of the joint 6 at the end of the pipe body 5 of the two pipes to be butt-jointed, is variable, and its variable maximum value W6max is substituted into the above formula. That is, the axial length L2 of the outer sleeve 12 needs to satisfy the condition: L2 > (W5 - W6max - 4×H)÷2.

[0062] The outer sleeve 12 is covered by the groove 21 of the clamp 2. Therefore, obviously, the axial length L2 of the outer sleeve 12 cannot be too long, and L2 should satisfy: L2 < W5÷2. That is, the axial length L2 of the outer sleeve 12 needs to satisfy the condition: W5÷2 > L2 > (W5 - W6max - 4×H)÷2.

[0063] In addition, in Figure 1 , Figure 2 and Figure 6In the structure of the example shown, the position of the card slot 51 should correspond to the position of the sealing groove 111. And the edge 22 of the clamp 2 is stuck in the card slot 51. Thus, when the axial length L2 of the aforementioned outer sleeve 12 needs to satisfy the condition L2 > (W5 - W6max - 4×H)÷2, it means that the axial distance L4 between the outer sleeve 12 and the sealing groove 111 is small enough. The axial distance L4 between the outer sleeve 12 and the sealing groove 111 corresponds to the clearance width D between the edge 22 and the outer sleeve 12. Therefore, the axial distance L4 between the outer sleeve 12 and the sealing groove 111 should satisfy the condition: L4 < 2×H. Of course, those skilled in the art understand that Figure 7 In the structure of the example shown, the position of the card slot 51 does not need to correspond to the sealing groove 111, and in this case, the above conditions do not need to be satisfied.

[0064] In addition, it should also be pointed out that there can be multiple sealing grooves 111. For example, in Figure 1 and Figure 2 in the structure of the example shown, there is one sealing groove 111 on the inner support body 11, while in Figure 3 、 Figure 4 、 Figure 5 and even Figure 7 in the structure of the example shown, there are two sealing grooves 111. Those skilled in the art can understand that the number of sealing grooves can be set by themselves according to needs. In the case of multiple sealing grooves 111, only one of the sealing grooves 111 needs to correspond to the card slot 51, and the other sealing grooves 111 do not need to correspond to the card slot 51.

[0065] Embodiment 2

[0066] This embodiment is a pipeline docking kit for pipeline docking. This pipeline docking kit is composed of the components of the pipeline docking structure in Embodiment 1 except for the pipe body 5 of the pipeline to be docked. These components can form the pipeline docking structure in Embodiment 1 when applied to dock the pipe bodies of two pipelines to be docked.

[0067] Embodiment 3

[0068] This embodiment is a pipeline docking method for the assembly of the pipeline docking structure in Embodiment 1, especially for Figure 1 the assembly of the pipeline docking structure shown in the example. This pipeline docking method includes the following steps:

[0069] S1: Insert the second sealing ring 4 into the sealing groove 111;

[0070] S2: Insert the pipe end sleeve 1 with the second sealing ring 4 into the pipe end of the pipe body 5 of the pipe to be butt - jointed, so that the end of the pipe body 5 of the pipe to be butt - jointed is inserted into the pipe groove 14. The end face of the butt - jointed end of the pipe body 5 is covered by the pipe end sleeve 1, and the inner support body 11 is attached to the inner surface of the pipe body 5 of the pipe to be butt - jointed, and the outer sleeve body 12 is attached to the outer surface of the pipe body 5 of the pipe to be butt - jointed;

[0071] S3: Roll the clamping groove 51 at the end of the pipe body 5 of the pipe to be butt - jointed by a grooving machine. When rolling the clamping groove 51, face the sealing groove 111, so that the pipe body is recessed inward to form an inner convex part 52 inside the pipe body, which is inserted into the sealing groove 111, compressing the second sealing ring 4 in the sealing groove 111;

[0072] S4: Put the first sealing ring 3 on the pipe body 5 of one of the pipes to be butt - jointed. After the pipe ends of the pipe bodies 5 of the two pipes to be butt - jointed are aligned, move the first sealing ring 3 to the joint 6 between the pipe bodies 5 of the two pipes to be butt - jointed, and make the center of the first sealing ring 3 align with the joint 6, so that the first sealing ring 3 is clamped on the outer sleeve body 12;

[0073] S5: Buckle the two semi - circular parts of the clamp 2 on the first sealing ring 3 so that the first sealing ring 3 is located in the groove 21 of the clamp 2, and the edge parts 22 on both sides of the groove 21 are respectively clamped in the clamping grooves 51 on the pipe bodies 5 of the two pipes to be butt - jointed. Then, fasten the two semi - circular parts of the clamp 2 with bolts to complete the butt - joint of the two pipes to be butt - jointed.

[0074] In the step of S3 above, it is required that the clamping groove 51 faces the sealing groove 111. Although the structure in Embodiment 1 does not require the end face of the butt - jointed end of the pipe body 5 to be abutted against the end sealing plate 13, in this embodiment, in order to facilitate the clamping groove 51 to face the sealing groove 111, in the step of S2, when the pipe end sleeve 1 is inserted into the pipe end of the pipe body 5 of the pipe to be butt - jointed, the end face of the butt - jointed end of the pipe body 5 is preferably abutted against the end sealing plate 13.

[0075] Further, for the case where the aforementioned first sealing ring 3 includes a balance cavity 31 covered by a cortex, in the step of S4 above, when the first sealing ring 3 is moved to the joint 6 between the pipe bodies 5 of the two pipes to be butt - jointed, it should be ensured that the notch 32 is directly opposite to the joint 6.

[0076] Further, for the case where the axial length of the aforementioned outer sleeve body 12 satisfies the condition W5÷2>L2>W5-4×H-W6max÷2, in the step of S3, when rolling the clamping groove 51, roll the clamping groove 51 along the end of the outer sleeve body 12 so that the edge of the clamping groove 51 aligns with the outer sleeve body 12.

[0077] Embodiment Four

[0078] In the foregoing embodiments, the sealing groove 111 on the inner support body 11 of the pipe end sleeve 1 can be formed by rolling with a grooving machine. When the sealing groove 111 is formed by rolling with a grooving machine, the width W2 of the sealing groove 111 is usually related to the die head size of the grooving machine. If the width of the width W2 of the sealing groove 111 is much larger than the die head size of the grooving machine, it will not be convenient for rolling processing. For example, the width W2 of the sealing groove 111 is 3.0 mm, while the die head size of the grooving machine is 1.0 mm. In such a case, the sealing groove 111 can be processed into an M shape. Referring to Figure 9 and Figure 10 the structures shown in the example, the sealing groove 111 is divided into two: the first sealing groove 1111 and the second sealing groove 1112. Among them, the first sealing groove 1111 is an M shape formed by combining two grooves. The second sealing rings 4 are respectively arranged in the two grooves. The width of each groove is the same as the die head size of the grooving machine, which is 1.5 mm. The overall width W2 of the sealing groove 111 formed by combining the two grooves is 5.0 mm. When cooperating with the clamping groove 51 on the pipe body 5 of the to-be-docked pipe, the inner convex part 52 generated by rolling the clamping groove 51 is integrally clamped into the first sealing groove 1111, and the second sealing rings 4 in the two grooves are compressed.

[0079] In this embodiment, the second sealing groove 1112 is a sealing groove with a small size, and its width is 0.8 mm. That is to say, in the present invention, when there are multiple sealing grooves 111, the widths of the respective sealing grooves 111 can be different. The preferred width of the foregoing sealing groove 111, W2, is 3.0 - 20.0 mm, which refers to the width of the sealing groove 111 that cooperates with the clamping groove 51, and there is no such requirement for other sealing grooves 111.

[0080] In addition, according to the sealing groove 111 formed by combining the above two grooves, those skilled in the art understand that the sealing groove 111 can also be formed by combining three, four or more grooves. When the sealing groove 111 is formed by combining multiple grooves, usually the second sealing rings 4 are respectively arranged in each groove.

Claims

1. Pipe docking structure, including a clamp (2), a first sealing ring (3) and the pipe bodies (5) of two pipes to be docked; characterized in that, It further includes a second sealing ring (4). Pipe end sleeves (1) are respectively arranged at the end parts of the butt-jointed ends of the pipe bodies (5) of the two pipes to be butt-jointed. The pipe end sleeve (1) is made of metal or alloy and includes an inner support body (11), an outer sleeve body (12) and an end sealing plate (13). Both the inner support body (11) and the outer sleeve body (12) are circular ring bodies, and the outer diameter of the inner support body (11) is smaller than that of the outer sleeve body (12). The ends of the inner support body (11) and the outer sleeve body (12) are connected by the end sealing plate (13), so that a pipe groove (14) with a U-shaped structure is formed between the inner support body (11) and the outer sleeve body (12). The end part of the pipe body (5) of the pipe to be butt-jointed is clamped into the pipe groove (14), the end face of the pipe body (5) is covered by the pipe end sleeve (1), and the inner support body (11) is attached to the inner surface of the pipe body (5) of the pipe to be butt-jointed, and the outer sleeve body (12) is attached to the outer surface of the pipe body (5) of the pipe to be butt-jointed. A clamping groove (51) is arranged at the end part of the pipe body (5). The clamp (2) includes a groove (21) on the inner side. The edge parts (22) on both sides of the groove (21) are respectively clamped into the clamping grooves (51) on the pipe bodies (5) of the two pipes to be butt-jointed, so that the clamp (2) covers the outer sleeve body (12). The first sealing ring (3) is arranged in the groove (21) and is clamped between the clamp (2) and the outer sleeve body (12). The first sealing ring (3) includes a balance cavity (31). The balance cavity (31) is covered by a cortex to form an annular structure. A notch (32) is arranged in the middle of the inner side of the balance cavity (31). The two sides of the notch (32) are annular cortex pressing plates (33). The notch (32) is opposite to the joint (6) between the two pipes to be butt-jointed. The cortex pressing plate (33) presses on the outer sleeve body (12). An annular sealing groove (111) is arranged on the outer cylindrical surface of the inner support body (11). The second sealing ring (4) is arranged in the sealing groove (111). The axial length of the inner support body (11) is greater than that of the outer sleeve body (12), so that the inner support body (11) has a protruding part (11P) protruding axially from the outer sleeve body (12). The sealing groove (111) is arranged on the protruding part (11P). The clamping groove (51) is formed by rolling. When the clamping groove (51) is rolled, the pipe body is recessed inward to form an inner convex part (52) inside the pipe body. The inner convex part (52) is clamped into the sealing groove (111). The axial distance between the sealing groove (111) and the outer sleeve body (12) is less than 2×H. The axial length of the outer sleeve body (12) satisfies the following condition: W5÷2>L2>(W5-4×H-W6max)÷2; where L2 is the axial length of the outer sleeve body (12), W5 is the groove width of the groove (21), H is the thickness of the cortex of the first sealing ring (3), and W6max is the maximum value allowed for the width W6 of the joint (6). The width W2 of the sealing groove (111) is 3.0~20.0mm.

2. The pipeline docking structure according to claim 1, characterized in that There are multiple sealing grooves (111).

3. The pipe docking structure according to claim 1, characterized in that, The sealing groove (111) is formed by merging multiple groove bodies. The second sealing ring (4) is respectively arranged in each groove body.

4. Pipe docking method, characterized in that, This method relates to the pipe butt-joint structure as described in claim 1, and this method includes the following steps: S1: Insert the second sealing ring (4) into the sealing groove (111). S2: Insert the pipe end sleeve (1) with the second sealing ring (4) into the pipe end of the pipe body (5) of the pipeline to be butt - jointed, so that the end of the pipe body (5) of the pipeline to be butt - jointed is inserted into the pipe groove (14), the end face of the butt - jointed end of the pipe body (5) is covered by the pipe end sleeve (1), and the inner support body (11) is attached to the inner surface of the pipe body (5) of the pipeline to be butt - jointed, and the outer sleeve body (12) is attached to the outer surface of the pipe body (5) of the pipeline to be butt - jointed; when the pipe end sleeve (1) is inserted into the pipe end of the pipe body (5) of the pipeline to be butt - jointed, the end face of the butt - jointed end of the pipe body (5) abuts against the end sealing plate (13). S3: Roll a clamping groove (51) at the end of the pipe body (5) of the pipeline to be butt - jointed by a grooving machine. When rolling the clamping groove (51), face the sealing groove (111), so that the pipe body is recessed inward to form an inner convex part (52) inside the pipe body, which is inserted into the sealing groove (111), compressing the second sealing ring (4) in the sealing groove (111). S4: Insert the first sealing ring (3) onto the pipe body (5) of one of the pipelines to be butt - jointed. After the pipe ends of the two pipe bodies (5) of the pipelines to be butt - jointed are aligned, move the first sealing ring (3) to the joint (6) between the two pipe bodies (5) of the pipelines to be butt - jointed, and align the center of the first sealing ring (3) with the joint (6), so that the first sealing ring (3) is clamped on the outer sleeve body (12). S5: Buckle the two semi - circular parts of the clamp (2) on the first sealing ring (3) so that the first sealing ring (3) is located in the groove (21) of the clamp (2), and the edge parts (22) on both sides of the groove (21) are respectively clamped in the clamping grooves (51) on the pipe bodies (5) of the two pipelines to be butt - jointed, and then fasten the two semi - circular parts of the clamp (2) with bolts to complete the butt - joint of the two pipelines to be butt - jointed.

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