Novel flanged wear-resistant double-sealing high-pressure joint for non-metal composite pipe

Abstract

The invention relates to the field of composite pipe high-pressure joints, in particular to a novel flanged wear-resistant double-sealing high-pressure joint for a non-metal composite pipe. Comprising a first metal lock sleeve, a second metal lock sleeve, a first sealing gasket and a second sealing gasket, wherein the first metal lock sleeve and the second metal lock sleeve are used for limiting and butting two pipe turnups; the first sealing gasket is arranged in a gap between the two pipe turnups; the second sealing gasket is arranged between the first metal lock sleeve and the second metal lock sleeve; and the locking mechanism is connected with the first metal lock sleeve and the second metal lock sleeve in a clamping manner. According to the structural design of the high-pressure connector, the pressure bearing performance of a flange movable flange connection type can be greatly improved, the problems of pipe body wire drawing, connector falling and the like are completely eradicated, and the pressure bearing capacity can be improved to 6.3 MPa from 2.5 MPa of a traditional structure. In addition, in the pipeline conveying operation of slag, particles, powder, paste and other media such as ore pulp or coal ash in the fields of metallurgical mines and the like, the problem that a metal inner core component using a conventional pipe connector is prone to abrasion can be solved.

Description

Technical Field

[0001] This invention relates to the field of high-pressure connectors for composite pipes, and more particularly to a novel flanged, wear-resistant, double-sealed high-pressure connector for non-metallic composite pipes. Background Technology

[0002] Currently, the connection methods of composite pipes are mainly divided into several types, such as metal crimped clamp connection, metal crimped threaded connection, metal crimped flange connection, and electrofusion sleeve connection. The first two types have good pressure resistance but high cost, while the latter two types have poor pressure resistance but low cost.

[0003] Traditional metal crimped flange joints generally have a pressure bearing capacity of no more than 2.5 MPa (this varies depending on the pipe diameter, and is even lower when used for large-diameter pipes of 150 mm or more). Excessive transmission pressure can easily lead to joint failure. The main cause of joint failure is the shedding of the steel wires in the composite pipe body (the reinforcing material includes steel wire and fiber filaments; we will take steel wire as an example), which causes the metal crimping parts to detach, resulting in joint failure and posing a very serious safety hazard.

[0004] In existing technologies, the wire pulling phenomenon occurs because composite pipes are mainly composed of three parts: an inner flow layer (polyethylene), a middle reinforcing layer (steel wire), and an outer protective layer (polyethylene). Traditional flanged structures cannot withstand high pressure. When the conveying pressure is too high, the steel wire is prone to pulling out and shifting, leading to failure of the pressure-bearing layer, pipe bursting, and joint detachment.

[0005] There is an urgent need to design and improve a new type of metal snap-fit ​​flange connection scheme to achieve medium and high pressure bearing performance while keeping costs low. Summary of the Invention

[0006] The purpose of this invention is to provide a novel flanged wear-resistant double-sealed high-pressure joint for non-metallic composite pipes, which aims to eliminate wire pulling, reduce the risk of joint leakage, and improve the pressure-bearing performance of the flanged connection of composite pipes.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] The present invention discloses a novel wear-resistant double-sealed high-pressure connector for non-metallic composite pipes, comprising a first metal locking sleeve and a second metal locking sleeve for limiting and connecting the flanges of two pipes, a first sealing gasket disposed in the gap between the flanges of the two pipes, a second sealing gasket disposed between the first metal locking sleeve and the second metal locking sleeve, and a locking mechanism for clamping and connecting the first metal locking sleeve and the second metal locking sleeve.

[0009] In this embodiment, the pipe further includes a pipe inner core, a pipe reinforcement layer disposed outside the pipe inner core, and a pipe outer protective layer disposed outside the pipe reinforcement layer.

[0010] Furthermore in this embodiment, both the first metal locking sleeve and the second metal locking sleeve include a long pipe section sleeved outside the outer protective layer of the pipe and an enlarged clamping joint for locking the flange of the pipe; and internal toothed racks are prefabricated on the inner wall of the long pipe section.

[0011] Furthermore, in this embodiment, a snap-fit ​​groove is provided in both the first metal locking sleeve and the second metal locking sleeve; the end of the pipe is provided with an outward flange adapted to be embedded in the snap-fit ​​groove.

[0012] Furthermore in this embodiment, the enlarged connector of the first metal lock sleeve and the enlarged connector of the second metal lock sleeve are connected by a plug-in method.

[0013] Furthermore in this embodiment, an annular groove is provided on the end face of the first metal lock sleeve, a boss that is adapted to be inserted into the annular groove is provided on the end face of the second metal lock sleeve, and a second sealing gasket is provided between the annular groove and the boss.

[0014] Furthermore in this embodiment, a first sealing gasket is provided between the outer flanges of the pipe, and both the first sealing gasket and the second sealing gasket are annular structures.

[0015] In this embodiment, the locking mechanism further includes a clamp for locking the expansion joint on the first metal lock sleeve and the expansion joint on the second metal lock sleeve, and a connecting bolt for the clamp.

[0016] In this embodiment, the locking mechanism further includes a connecting flange for locking the enlarged snap-fit ​​connector on the first metal lock sleeve and the enlarged snap-fit ​​connector on the second metal lock sleeve, and a connecting bolt for the connecting flange.

[0017] This embodiment provides a processing technology for a novel flanged wear-resistant double-sealed high-pressure joint for non-metallic composite pipes:

[0018] First, the pipe end face is flattened;

[0019] Then, a metal locking sleeve is installed at the end of the pipe, which is mechanically pushed by the pipe jacking machine and the locking machine crimps the locking sleeve;

[0020] Next, the pipe ends are softened by heating using a special mold with electric heating to ensure uniform softening of the pipe body;

[0021] Next, the pipe ends are pre-deformed and expanded by using the pre-deformation mold of the pipe jacking machine.

[0022] Next, the steel wire is deformed and shaped. Based on the pre-deformation of the pipe opening, the pipe opening is turned outward by 90° using a shaping mold, and the steel wire is turned outward and shaped at the same time.

[0023] Finally, the sealing surface is shaped. Based on the steel wire shaping, the sealing surface is shaped using a mold.

[0024] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0025] The high-pressure joint structure design of this application can greatly improve the pressure-bearing performance of the flanged live flange connection type, eliminate problems such as pipe thread pulling and joint detachment, and increase the pressure-bearing capacity from 2.5MPa of the traditional structure to 6.3MPa.

[0026] In addition, this application can avoid the problem of easy wear of metal core components in conventional pipe joints in pipeline transportation operations of slurry or fly ash and other media such as slag, granules, powder, paste in metallurgical mining and other fields. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the cross-section of the novel flanged wear-resistant double-sealed high-pressure joint for non-metallic composite pipes in Example 1;

[0029] Figure 2 for Figure 1 Enlarged view of a portion of the image;

[0030] Figure 3 This is a schematic diagram of the cross-section of the novel flanged wear-resistant double-sealed high-pressure joint for non-metallic composite pipes in Example 2;

[0031] Figure 4 for Figure 3 Enlarged view of a portion of the image;

[0032] Figure 5 This is a schematic diagram of the structure of a metal lock sleeve.

[0033] Explanation of reference numerals in the attached drawings: 1. Inner core of the pipe; 11. Reinforcing layer of the pipe; 12. Outer protective layer of the pipe; 2. First metal locking sleeve; 21. First long pipe section; 22. First enlarged clamping joint; 23. Annular groove; 24. First clamping groove; 3. Clamp; 4. Connecting bolt; 5. First sealing gasket; 6. Second sealing gasket; 7. Second metal locking sleeve; 71. Second long pipe section; 72. Second enlarged clamping joint; 73. Insertion ring; 74. Second clamping groove; 8. Connecting flange. Detailed Implementation

[0034] Example 1

[0035] refer to Figure 1 and Figure 2 This embodiment provides a novel wear-resistant double-sealed high-pressure joint for non-metallic composite pipes, including a first metal locking sleeve 2 and a second metal locking sleeve 7 for limiting and connecting the flanges of two pipes, a first sealing gasket 5 installed in the gap between the flanges of the two pipes, a second sealing gasket 6 installed between the first metal locking sleeve 2 and the second metal locking sleeve 7, and a locking mechanism for clamping and connecting the first metal locking sleeve 2 and the second metal locking sleeve 7; wherein the first sealing gasket 5 and the second sealing gasket 6 provide two sealing structures at the pipe joint.

[0036] In this embodiment, a double-sealing structure is adopted. In addition to the main sealing surface formed by the flange of the pipe, an auxiliary sealing gasket is added at the metal concave-convex surface fitting part. The first sealing gasket 5 and the second sealing gasket 6 are both made of rubber. The sealing is achieved by squeezing the sealing gasket with the axial tensile force of the bolt. The first sealing gasket 5 and the second sealing gasket 6 can also be made of other polymer materials, such as polytetrafluoroethylene.

[0037] refer to Figure 1 The pipe includes a pipe core 1, a pipe reinforcement layer 11 formed on the outside of the pipe core 1 by hot melting, and a pipe outer protective layer 12 formed on the outside of the pipe reinforcement layer 11 by hot melting; wherein the pipe core 1 is polyethylene, the pipe reinforcement layer 11 is steel wire, and the pipe outer protective layer 12 is polyethylene.

[0038] refer to Figure 2 and Figure 5 The first metal locking sleeve 2 includes a first long pipe section 21 sleeved outside the outer protective layer 12 of the pipe and a first enlarged clamping connector 22 integrally connected to the first long pipe section 21 and used to lock the flange of the pipe; the second metal locking sleeve 7 includes a second long pipe section 71 sleeved outside the outer protective layer 12 of the pipe and a second enlarged clamping connector 72 integrally connected to the second long pipe section 71 and used to lock the flange of the pipe.

[0039] Internal toothed racks are prefabricated on the inner walls of the first long pipe section 21 and the second long pipe section 71, respectively. The internal toothed racks can be crimped onto the outer wall of the pipe by a high-pressure pipe-locking machine to enhance the connection strength of the structure.

[0040] The first enlarged snap-fit ​​connector 22 has a first snap-fit ​​groove 24, and the second enlarged snap-fit ​​connector 72 has a second snap-fit ​​groove 74. The ends of the pipe are designed with outward flanges that are respectively adapted to fit into the first snap-fit ​​groove 24 and the second snap-fit ​​groove 74.

[0041] In this embodiment, specifically, an annular groove 23 is formed on the end face of the enlarged snap-fit ​​connector 22 of the first metal locking sleeve 2, and an insertion ring 73 is designed on the contact end face of the enlarged snap-fit ​​connector 72 of the second metal locking sleeve 7. The insertion ring 73 is adapted to be inserted into the annular groove 23, and a second sealing gasket 6 is also embedded in the annular groove 23. By adopting a concave-convex surface fitting structure, the risk of sealing surface misalignment and sealing gasket extrusion failure is reduced.

[0042] A first sealing gasket 5 is installed between the outer flanges of the pipe. Both the first sealing gasket 5 and the second sealing gasket 6 are annular structures, adopting a double sealing method to reduce the risk of joint leakage.

[0043] In this embodiment, the first enlarged snap-fit ​​connector on the first metal lock sleeve 2 and the second enlarged snap-fit ​​connector on the second metal lock sleeve 7 are both formed by mold shaping process to form a concave-convex interlocking sealing method, which can effectively prevent the risk of failure such as misalignment of sealing surface and extrusion of sealing gasket.

[0044] In this embodiment, the locking mechanism includes a clamp 3 for locking the first enlarged connector 22 on the first metal lock sleeve 2 and the second enlarged connector 72 on the second metal lock sleeve 7, and a connecting bolt 4 for the clamp 3. The cross-sections of the first enlarged connector 22 and the second enlarged connector 72 are right-angled trapezoids to facilitate locking within the clamp 3.

[0045] This embodiment provides a processing technology for a novel flanged wear-resistant double-sealed high-pressure joint for non-metallic composite pipes:

[0046] First, the pipe end face is flattened. Then, a metal locking sleeve is installed at the pipe end, which is mechanically pushed in by a pipe jacking machine and pressed by a pipe locking machine. Next, the pipe opening is heated and softened using a special mold with electric heating to ensure uniform softening of the pipe body. Then, the pipe opening is pre-deformed and flared using a pre-deformation mold on the pipe jacking machine. Next, the steel wire is deformed and shaped. Based on the pre-deformation of the pipe opening, the opening is turned outward by 90° using a shaping mold, and the steel wire is turned outward and shaped at the same time. Finally, the sealing surface is shaped. Based on the shaped steel wire, the sealing surface is shaped using a mold.

[0047] Example 2

[0048] Based on Example 1, and referring to Figure 3 and Figure 4 The locking mechanism may further include a connecting flange 8 for locking the enlarged snap-fit ​​connector on the first metal lock sleeve 2 and the enlarged snap-fit ​​connector on the second metal lock sleeve 7, and a connecting bolt 4 for the connecting flange 8.

[0049] The first enlarged clamp 22 and the second enlarged clamp 72 have rectangular cross-sections. The maximum outer diameter of the first enlarged clamp 22 and the second enlarged clamp 72 is greater than the outer diameter of the pipe. The connecting flange 8 is adapted to be installed on the outside of the pipe and the first enlarged clamp 22 and the second enlarged clamp 72 are locked by the connecting bolts 4.

[0050] Both of the above connection methods in this application are matched with metal locking sleeves. The connecting flange 8 is used in the case of conveying low pressure, and the clamp 3 is used in the case of conveying high pressure. The connection of the connecting flange 8 requires 8-16 bolts for fastening, while the connection of the clamp 3 only requires 2 bolts for fastening.

[0051] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A novel flanged, wear-resistant, double-sealed high-pressure connector for non-metallic composite pipes, characterized in that: It includes a first metal locking sleeve (2) and a second metal locking sleeve (7) for limiting and connecting the flanges of two pipes, a first sealing gasket (5) disposed in the gap between the flanges of the two pipes, a second sealing gasket (6) disposed between the first metal locking sleeve (2) and the second metal locking sleeve (7), and a locking mechanism for clamping and connecting the first metal locking sleeve (2) and the second metal locking sleeve (7).

2. The novel flanged wear-resistant double-sealed high-pressure joint for non-metallic composite pipes according to claim 1, characterized in that: The pipe includes a pipe core (1), a pipe reinforcement layer (11) disposed outside the pipe core (1), and a pipe outer protective layer (12) disposed outside the pipe reinforcement layer (11).

3. The novel flanged wear-resistant double-sealed high-pressure connector for non-metallic composite pipes according to claim 2, characterized in that: Both the first metal locking sleeve (2) and the second metal locking sleeve (7) include a long pipe section sleeved outside the outer protective layer (12) of the pipe and an enlarged clamping joint for locking the flange of the pipe; and internal toothed racks are prefabricated on the inner wall of the long pipe section.

4. The novel flanged wear-resistant double-sealed high-pressure joint for non-metallic composite pipes according to claim 3, characterized in that: A snap-fit ​​groove is provided in both the first metal locking sleeve (2) and the second metal locking sleeve (7); the end of the pipe is provided with an outward flange that is adapted to be embedded in the snap-fit ​​groove.

5. The novel flanged wear-resistant double-sealed high-pressure joint for non-metallic composite pipes according to claim 3, characterized in that: The enlarged connector of the first metal lock sleeve (2) and the enlarged connector of the second metal lock sleeve (7) are connected by a plug-in method.

6. The novel flanged wear-resistant double-sealed high-pressure joint for non-metallic composite pipes according to claim 5, characterized in that: An annular groove is provided on the end face of the first metal lock sleeve (2), a boss that is adapted to be inserted into the annular groove is provided on the end face of the second metal lock sleeve (7), and a second sealing gasket (6) is provided between the annular groove and the boss.

7. The novel flanged wear-resistant double-sealed high-pressure joint for non-metallic composite pipes according to claim 6, characterized in that: A first sealing gasket (5) is provided between the outer flanges of the pipe, and both the first sealing gasket (5) and the second sealing gasket (6) are annular structures.

8. The novel flanged wear-resistant double-sealed high-pressure connector for non-metallic composite pipes according to claim 6, characterized in that: The locking mechanism includes a clamp (3) for locking the enlarged connector on the first metal lock sleeve (2) and the enlarged connector on the second metal lock sleeve (7), and a connecting bolt (4) for the clamp (3).

9. The novel flanged wear-resistant double-sealed high-pressure joint for non-metallic composite pipes according to claim 6, characterized in that: The locking mechanism includes a connecting flange (8) for locking the enlarged snap-fit ​​connector on the first metal lock sleeve (2) and the enlarged snap-fit ​​connector on the second metal lock sleeve (7), and a connecting bolt (4) for the connecting flange (8).

10. The novel flanged wear-resistant double-sealed high-pressure joint for non-metallic composite pipes according to any one of claims 1-9, characterized in that, Its processing technology: First, the pipe end face is flattened; Then, a metal locking sleeve is installed at the end of the pipe, which is mechanically pushed by the pipe jacking machine and the locking machine crimps the locking sleeve; Next, the pipe ends are softened by heating using a special mold with electric heating to ensure uniform softening of the pipe body; Next, the pipe ends are pre-deformed and expanded by using the pre-deformation mold of the pipe jacking machine. Next, the steel wire is deformed and shaped. Based on the pre-deformation of the pipe opening, the pipe opening is turned outward by 90° using a shaping mold, and the steel wire is turned outward and shaped at the same time. Finally, the sealing surface is shaped. Based on the steel wire shaping, the sealing surface is shaped using a mold.

Images