Pipe joint structure and method

Abstract

The present application belongs to the technical field of high-pressure pipeline, and particularly relates to a pipeline welding-free connecting structure and a connecting method. The present application comprises a pipeline, a joint in butt joint with the pipeline, a taper sleeve installed outside the pipeline, and a fiber winding layer reciprocally wound outside the pipeline, the taper sleeve and the joint; one end of the pipeline is provided with a flange; an end face groove is formed on the inner wall of the head part, the pipeline and the joint are in butt joint and limited by the flange and the end face groove, and the fiber is reciprocally wound outside the pipeline, the taper sleeve, the head part and the recessed part to form the fiber winding layer. The fiber is reciprocally wound outside the outer surface of the pipeline, the taper sleeve, the head part and the recessed part according to a predetermined angle, the reciprocally wound fiber winding layer can control the circumferential expansion deformation amount of the pipeline under the internal pressure load condition, and constrain the axial relative displacement of the pipeline and the joint; the pipeline and the joint can be connected without using glue joint or welding, and the axial continuity and the sealing reliability between the pipeline and the joint can be effectively ensured.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of high-pressure pipelines, and particularly relates to a pipeline welding-free connection structure and a connection method. BACKGROUND

[0002] Pressure pipelines are widely used in the fields of oil transportation, water conservancy guarantee and chemical liquid transfer, as an effective device for extracting material transportation efficiency, reducing operation cost and being easy to maintain. Compared with traditional metal conveying pipes which need to consume a large amount of operation cost due to the disadvantages of easy corrosion, low strength and large specific gravity, composite pressure pipelines are more popular due to their characteristics of light weight, high strength, corrosion resistance and fatigue resistance.

[0003] The connection between composite pressure pipelines mainly adopts a connection mode of glue joint or welding. The connection mode of glue joint or welding makes the composite pressure pipeline have a high construction and maintenance cost, and the composite pressure pipeline adopting the connection mode of glue joint or welding has a low reliability under high pressure conditions and in a medium environment sensitive to welding defects. Therefore, it is urgent to develop a composite pressure pipeline without glue joint or welding and with high reliability. SUMMARY

[0004] The present application aims to overcome the defects of high construction and maintenance cost and low reliability of the prior art pressure pipeline, and provide a pipeline welding-free connection structure and a connection method without welding or glue joint, with low construction and maintenance cost and high reliability.

[0005] The technical solution adopted by the present application to solve the technical problems is as follows:

[0006] A pipeline welding-free connection structure, characterized in that: comprising a pipeline, a joint in butt joint with the pipeline, a taper sleeve installed outside the pipeline and adjacent to the joint at a large end face, and a fiber winding layer wound outside the pipeline, the taper sleeve and the joint; the end of the pipeline is provided with a flange, the joint comprises a connecting part and a head part, and a recess is arranged at the connection between the connecting part and the head part; an end face groove is formed in the inner wall of the head part, the pipeline is in limiting butt joint with the joint through the flange and the end face groove, and the fiber is wound outside the pipeline, the taper sleeve, the head part and the recess to form a fiber winding layer.

[0007] Further, a sealing groove is formed in the inner wall of the head part, a sealing element is arranged in the sealing groove, and the groove direction of the end face groove is perpendicular to the groove direction of the sealing groove.

[0008] Further, the groove width of the end face groove is greater than the width of the flange.

[0009] Further, the junction between the outer wall surface of the head part and the recess is a circular arc guide curved surface.

[0010] Further, a plurality of threaded holes extending along the axial direction are formed on the connecting portion, and bolts are passed through the threaded holes to fix the joint connected to the two pipes together.

[0011] Further, the inner walls of the pipe and the joint are coated with a polymer lining.

[0012] Preferably, the connecting portion is internally threaded or externally threaded.

[0013] Preferably, the connecting portion is a loose flange.

[0014] The present application also discloses a pipe welding-free connecting method.

[0015] S1, a taper sleeve is installed on the pipe, and the large end face of the taper sleeve faces the outer end of the pipe;

[0016] S2, a sealing element is installed in the sealing groove, the head portion of the joint is sleeved on the end portion of the pipe, and abuts against the large end face of the taper sleeve;

[0017] S3, the fiber composite material is wound on the pipe, the taper sleeve, the head portion and the recess portion in sequence to form a fiber winding layer, and finally the fiber winding layer is heated and solidified.

[0018] The pipe welding-free connecting structure and the connecting method have the following advantages:

[0019] 1, the pipe and the joint are limited by the flange and the end face groove, the connecting portion of the joint and the connecting portion of the head portion are provided with a recess portion, the fiber is reciprocally wound on the pipe, the taper sleeve, the head portion and the recess portion at a predetermined angle, the recess portion limits the fiber, the reciprocally wound fiber winding layer can control the circumferential expansion deformation amount of the pipe under the internal pressure load, and can constrain the axial relative displacement of the pipe and the joint, so that the seamless connection of the pressure pipe is realized, and the sealing property and the reliability of the connecting portion of the pipe and the joint are effectively ensured.

[0020] 2, the taper sleeve is arranged on the outer peripheral surface of the pipe, and the large end face of the taper sleeve is adjacent to the head portion, so that the uniform transition of the outer contour of the pipe and the outer contour of the joint is realized, the integrity of the inner passage of the pipe is effectively ensured, and the pressure drop, the high additional bending moment and the shear force near the pipe joint are not generated. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0022] Figure 1 is the overall structure diagram of embodiment 1 of the present application;

[0023] Figure 2 is a joint structure diagram of the embodiment 1 of the present application;

[0024] Figure 3 is a pressure pipe connecting structure diagram of the embodiment 1 of the present application;

[0025] Figure 4 is a joint structure diagram of the embodiment 2 of the present application;

[0026] Figure 5 is a joint structure diagram of the embodiment 3 of the present application.

[0027] In the figure: 1, pipe, 2, joint, 21, connecting part, 22, head part, 23, recessed part, 3, taper sleeve, 4, fiber winding layer, 5, flange, 6, end face groove, 7, sealing groove, 8, sealing element, 9, threaded hole, 10, polymer inner lining, 11, outer thread, 12, loose flange. DETAILED DESCRIPTION

[0028] The present application will now be further described in detail with reference to the drawings. These drawings are simplified schematic diagrams, and only schematically show the basic structure of the present application, and thus only show the components related to the present application.

[0029] Embodiment 1

[0030] As Figures 1-3The shown specific embodiment 1 of the pipeline welded joint-free connecting structure of the application comprises a pipeline 1, a joint 2 tenoned with the pipeline 1, a cone sleeve 3 installed outside the pipeline 1 and adjacent to the joint 2 in the large end face, and a fiber winding layer 4 reciprocally wound outside the pipeline 1, the cone sleeve 3 and the joint 2; the end of the pipeline 1 is provided with a flange 5, the joint 2 comprises a connecting part 21 and a sealing head part 22, and a recessed part 23 is arranged at the connecting part 21 and the sealing head part 22; an end face groove 6 is formed on the inner wall of the sealing head part 22, the pipeline 1 and the joint 2 are tenoned and limited by the flange 5 and the end face groove 6, the fiber is reciprocally wound outside the surface of the pipeline 1, the cone sleeve 3, the sealing head part 22 and the recessed part 23 to form the fiber winding layer 4, the fiber winding layer 4 is heated and solidified to complete the connection between the pressure pipelines. The pressure pipeline is constructed as an integrated pipeline structure with the pipe body and the joint, the characteristics of the fiber winding forming process are used to make the pipeline 1 and the joint 2 not need to be connected by a welded joint, and the sealing of the pipeline 1 and the joint 2 and the axial continuity of the fiber winding layer 4 between the pipelines can be maintained. The pipeline 1 and the joint 2 are limited by the tenon connection of the flange 5 and the end face groove 6, the connecting part 21 and the sealing head part 22 of the joint 2 are arranged as the recessed part 23, the outer diameter of the recessed part 23 is smaller than that of the sealing head part 22, the fiber is reciprocally wound outside the pipeline 1, the cone sleeve 3, the sealing head part 22 and the recessed part 23 at a predetermined angle, the axial limitation of the recessed part 23 to the fiber can inhibit the axial movement of each fiber bundle, thereby effectively avoiding the disconnection of the joint 2 and the pipeline 1, realizing the connection of the pressure pipeline, not needing to use glue jointing or welding, and effectively ensuring the sealing and reliability of the connection between the pipeline 1 and the joint 2. Finally, the fiber winding layer 4 is heated and solidified to further ensure the close connection of the joint 2 and the pipeline 1, effectively avoid the disconnection of the joint 2 and the pipeline 1, and further ensure the better connection of the joint 2 and the pipeline 1. The reciprocally wound fiber winding layer 4 can control the circumferential expansion deformation amount of the pipeline 1 under the internal pressure load condition and constrain the axial relative displacement of the pipeline 1 and the joint 2.

[0031] The pipe 1 is cylindrical and the end of the pipe 1 has a flange 5 which is tenon-fitted with the end face groove 6 of the joint 2, the pipe 1 is made of metal material or polymer material, the joint 2 is made of metal material or polymer material, the flange 5 is tenon-fitted with the end of the pipe 1, the joint 2 is clearance-fitted with the outer circumferential surface of the pipe 1 in the radial direction, the radial freedom of the joint 2 and the pipe 1 is constrained to each other, the joint 2 is configured to communicate between the inner space of the pressure pipe and the outer space of the pressure pipe, the taper sleeve 3 is arranged on the outer circumferential surface of one end of the pipe 1 and the large end surface of the taper sleeve 3 is adjacent to the joint 2, the taper sleeve 3 is installed between the joint 2 and the pipe 1, so that the outer contour and the wall thickness between the joint 2 and the pipe 1 are uniformly transitioned; the taper sleeve 3 is made of metal material or polymer material, the fiber is wound on the outer circumferential surface of the pipe 1, the outer circumferential surface of the taper sleeve 3, the outer circumferential surface of the head part 22 and the outer circumferential surface of the recessed part 23 by the fiber winding process, the circumferential fiber and the spiral fiber are wound on the outer wall of the whole pipe respectively, and the fiber winding layer 4 is formed, wherein the circumferential fiber layer is used to resist the circumferential deformation of the pipe body caused by high internal pressure, and the spiral fiber layer wound on the head part 22 is used to constrain the axial freedom between the joint 2 and the pipe 1, thereby avoiding the use of a welded joint. Each fiber of the fiber winding layer 4 plays a role in constraining the axial movement of the joint 2, thereby realizing a reliable welded joint form, the design of the outer wall of the pipe 1, the joint 2 and the taper sleeve 3 effectively ensures the integrity of the channel in the pipe 1 and does not cause pressure drop, and the design of the taper sleeve 3 enables the fiber winding layer 4 and the wall thickness of the pipe 1 to be uniformly transitioned, so that high additional bending moment and shear force do not occur near the interface of the pipe 1; the fiber winding layer 4 is a fiber reinforced resin matrix composite material made of any combination of three fiber materials of carbon fiber, glass fiber or aramid fiber, the fiber winding layer 4 enhances the pressure resistance of the high-pressure pipe in the axial and radial directions, the fiber is wound on the outer circumferential surface of the pipe 1, the outer circumferential surface of the taper sleeve 3, the outer circumferential surface of the head part 22 and the outer circumferential surface of the recessed part 23 at a predetermined angle, which can inhibit the disassembly of the fiber winding layer 4 from the outer circumferential surface of the taper sleeve 3 and the outer circumferential surface of the pipe 1, and the winding mode of the fiber is not limited to this mode.

[0032] A sealing groove 7 is formed on the inner wall of the head part 22, and a sealing element 8 is arranged in the sealing groove 7. The self-tightening combined sealing element 8 is installed in the sealing groove 7 to realize reliable sealing of the outer wall of the pipe 1 under high-pressure hydrogen conditions. The groove direction of the end face groove 6 is perpendicular to the groove direction of the sealing groove 7.

[0033] A notch is formed on the inner wall of one end of the pipe 1 to form a flange 5, and the groove width of the end face groove 6 is slightly larger than the width of the flange 5, so as to facilitate the tenon connection of the flange 5 and the end face groove 6.

[0034] The outer wall surface of the head part 22 and the connection part 21 is a circular arc guide surface, and the adjacent special-shaped rotary surface has a recess 23 at the connection part of the circular arc guide surface and the special-shaped rotary surface. The outer circumferential surface of the taper sleeve 3, the outer circumferential surface of the pipeline 1 and the outer circumferential surface of the joint 2 are designed as a continuous and smooth rotary surface. The inner wall of the head part 22 is designed as a stepped surface, and an end face groove 6 corresponding to the flange 5 is formed on the stepped surface of the head part 22, and a sealing groove 7 is formed on the stepped side wall of the head part 22.

[0035] A plurality of threaded holes 9 extending along the axial direction of the connection part 21 are formed on the connection part 21, and the bolts pass through the threaded holes 9 to fix the joints connected to the two pipelines together.

[0036] A polymer lining 10 made of rubber, high-density polyethylene or polyamide is coated on the inner wall of the pipeline 1 and the joint 2. The polymer lining 10 is directly in contact with hydrogen, and the hydrogen permeated from the polymer lining 10 is hindered by the metal layer, and the contact partial pressure of the hydrogen with the metal layer is effectively reduced, thereby slowing down the hydrogen embrittlement damage degree of the metal layer and improving the fatigue life of the metal layer.

[0037] A pipeline welding-free connection method, comprising the following steps:

[0038] S1, installing the taper sleeve 3 on the pipeline 1, and the large end surface of the taper sleeve 3 faces the outer end of the pipeline 1;

[0039] S2, installing the sealing element 8 in the sealing groove 7, and sleeving the head part 22 of the joint 2 on the end part of the pipeline 1 and abutting against the large end surface of the taper sleeve 3;

[0040] S3, winding the fiber composite material on the pipeline 1, the taper sleeve 3 and the head part 22 in sequence until the outside of the recess 23 to form the fiber winding layer 4, and finally heating and curing the fiber winding layer 4. Thus, the connection between the pressure pipelines is realized without using the gluing or welding connection mode.

[0041] Example 2

[0042] Referring to Figure 4 The difference between the example 1 and the example 2 is that the connection part 21 of the example 2 is connected by threads, Figure 4 The joint in the example 2 is an external thread 11, and the other joint connected thereto is of course designed as an internal thread.

[0043] Example 3

[0044] Referring to Figure 5Unlike Example 1, the connecting portion 21 of this example is connected in the form of a loose flange 12.

[0045] It should be understood that the above described embodiments are merely meant to explain the present application and are not intended to limit the present application. The obvious changes or modifications derived from the spirit of the present application are still within the scope of the present application.

Claims

1. A pipe weldless connection structure characterized by: The pipe (1), the joint (2) connected with the pipe (1), the cone sleeve (3) installed outside the pipe (1) and adjacent to the joint (2) in the large end surface, and the fiber winding layer (4); the end of the pipe (1) is provided with a flange (5), the joint (2) comprises a connecting part (21) and a sealing head part (22), the connecting part (21) and the sealing head part (22) are provided with a recess (23) at the connecting part, the outer wall surface of the sealing head part (22) and the recess (23) are circular arc guide curved surfaces; the inner wall of the sealing head part (22) is provided with an end surface groove (6), the pipe (1) and the joint (2) are connected by the flange (5) and the end surface groove (6), and the fiber is wound outside the pipe (1), the cone sleeve (3), the sealing head part (22) and the recess (23) in sequence to form the fiber winding layer (4); the fiber winding layer (4) is cured by heating to ensure the close connection between the joint (2) and the pipe (1); The inner wall of the sealing head part (22) is provided with a sealing groove (7), the sealing groove (7) is provided with a sealing element (8), and the groove direction of the end surface groove (6) is perpendicular to the groove direction of the sealing groove (7); The large end surface of the cone sleeve (3) faces the outer end of the pipe (1). The sealing head part (22) of the joint (2) is sleeved on the end of the pipe (1) and abuts against the large end surface of the cone sleeve (3).

2. The pipe weldless connection structure according to claim 1, characterized by: The width of the end surface groove (6) is greater than the width of the flange (5).

3. The pipe weldingless joint structure according to claim 1, wherein: A plurality of threaded holes (9) extending along the axial direction are formed in the connecting part (21), and the bolts pass through the threaded holes (9) to fix the joints (2) connected with two pipes (1) together.

4. The pipe weldingless joint structure according to claim 1, wherein: The inner walls of the pipe (1) and the joint (2) are coated with a polymer lining (10).

5. The pipe weldless connection structure according to claim 1, characterized by: The connecting part (21) is internally threaded or externally threaded.

6. The pipe weldless connection structure according to claim 1, characterized by: The connecting part (21) is a loose flange.

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