Compression-resistant HDPE (high-density polyethylene) double-wall corrugated pipe

Abstract

The utility model relates to the technical field of pipe fittings, in particular to a compression-resistant HDPE double-wall corrugated pipe which comprises an inner-layer pipe body, a plurality of corrugated pipe bodies are arranged on the outer wall face of the inner-layer pipe body in a surrounding mode, the corrugated pipe bodies are evenly arranged in the length direction of the inner-layer pipe body at intervals, each corrugated pipe body is of a hollow structure, and the inner-layer pipe body is of a hollow structure. A supporting framework attached to the inner wall face of the corrugated pipe body is arranged in the corrugated pipe body. According to the double-wall corrugated pipe, the supporting framework is arranged in the corrugated pipe body, so that the pressure resistance of the corrugated pipe body is enhanced, the corrugated pipe body and the inner-layer pipe body located in the corrugated pipe body are not prone to deformation, and the pressure resistance of the double-wall corrugated pipe is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe fittings, and more specifically, to a compressive HDPE double-wall corrugated pipe. Background Art

[0002] HDPE double-wall corrugated pipe is a kind of lightweight pipe, with the characteristics of light weight, good toughness, fast construction, long service life, etc. Its excellent pipe wall structure design greatly reduces the cost compared with pipes of other structures. The outer wall of the HDPE double-wall corrugated pipe is provided with an annular corrugated structure, which greatly enhances the ring stiffness of the pipe, thereby enhancing the resistance of the pipeline to soil load. It can be used for compensating the thermal deformation of the pipe, shock absorption, absorbing the settlement deformation of the pipeline, etc., and is widely used in drainage and sewage pipes for home decoration, municipal engineering, etc. However, in some special usage scenarios, relying solely on the HDPE material itself and the corrugated pipe design cannot meet the compressive requirements, and additional devices need to be set up to enhance the compressive resistance.

[0003] There is an existing Chinese utility model with the publication number CN218236482U, which discloses a modified and enhanced PE double-wall corrugated pipe, including a PE double-wall corrugated pipe body. The port of the PE double-wall corrugated pipe body is connected to a socket pipe body through a connecting ring. The socket pipe body consists of an outer shell, a compressive layer, and an inner shell, and a compressive layer is installed between the outer shell and the inner shell. For this modified and enhanced PE double-wall corrugated pipe, this technical solution is provided with a connecting ring and a socket pipe body. Through the connecting ring, it is convenient to connect the PE double-wall corrugated pipe body to the socket pipe body, so that when connecting the PE double-wall corrugated pipe body, it is not easy to damage the pipe orifice of the PE double-wall corrugated pipe. At the same time, the socket pipe body consists of an outer shell, a compressive layer, and an inner shell, which improves the anti-axial destructive force of the socket pipe body. This technical solution makes the PE double-wall corrugated pipe body have the advantages of high strength and long service life through the combined use of a wear-resistant layer, a buffer pad, a strengthening layer, a first reinforcing rib, and a second reinforcing rib.

[0004] However, in the above technical solution, since there is only a compressive layer provided at the socket pipe body, and there are no other structures or devices on the PE corrugated pipe body to strengthen the compressive resistance of the pipe body, during actual use, the pipe body may still deform due to excessive pressure, resulting in the pipe body collapsing inward, reducing the passing ability of the PE corrugated pipe, or the pipe body rupturing and causing leakage. Summary of the Utility Model

[0005] In order to solve the problem of insufficient compressive capacity of HDPE double-wall corrugated pipes in the prior art, the utility model provides a compressive HDPE double-wall corrugated pipe, which can withstand higher radial loads, enabling the HDPE double-wall corrugated pipe to work safely under higher external pressures.

[0006] To solve the above technical problems, the technical solution adopted by the present utility model is as follows: A compression-resistant HDPE double-wall corrugated pipe, which includes an inner pipe body. On the outer wall surface of the inner pipe body, there is a corrugated pipe body surrounded. There are multiple corrugated pipe bodies, and the multiple corrugated pipe bodies are evenly spaced along the length direction of the inner pipe body. The corrugated pipe body is a hollow structure, and a support skeleton that fits the inner wall surface of the corrugated pipe body is arranged inside the corrugated pipe body.

[0007] In this technical solution, the compression-resistant HDPE double-wall corrugated pipe includes an inner pipe body and a corrugated pipe body. Among them, the inner pipe body is a hollow tubular structure for transporting fluids. The corrugated pipe body is annular and is arranged on the outer peripheral surface of the inner pipe body, playing a supporting role for the shape of the corrugated pipe body. When an external pressure is applied to the inner pipe, the pressure needs to be applied to the corrugated pipe body first. On the one hand, the corrugated pipe body can offset part of the pressure. On the other hand, when the pressure is applied to the corrugated pipe body, it will be evenly dispersed to the inner pipe body by the corrugated pipe body, avoiding the situation where the pressure is too concentrated, resulting in partial inward collapse of the inner pipe body, reducing the space available for fluid flow in the inner pipe body, leading to a slowdown in the flow rate, or even causing the inner pipe body to rupture and the fluid in the pipe to leak. When the pressure inside the inner pipe is relatively large, the inner pipe body is subjected to pressure from the inside to the outside. At this time, the corrugated pipe body plays a role in tightly clamping the inner pipe body on the outside, providing an inward supporting force for the inner pipe body to offset the outward pressure of the inner pipe body. When the pressure received is too large, the corrugated pipe body may still be deformed under pressure, and then lose the supporting effect on the inner pipe body. In order to enable the corrugated pipe body to withstand greater pressure, a support skeleton is also arranged inside the corrugated pipe body. The support skeleton is a steel material structure, which has relatively high hardness and good toughness and can withstand higher pressure to support the outer shape of the corrugated pipe skeleton to ensure that it will not deform. The support skeleton is arranged inside the corrugated pipe body, so that the corrugated pipe body plays a role in protecting the support skeleton, isolating the support skeleton from the outside world, avoiding rust or corrosion of the support skeleton when it comes into contact with the outside world, and extending the service life of the support skeleton. A single corrugated pipe body can only support the inner pipe body within a certain distance nearby, and the inner pipe body is a long strip structure. A single corrugated pipe body cannot support the entire inner pipe body. Therefore, there are multiple corrugated pipe bodies, and the multiple corrugated pipe bodies are evenly arranged along the length direction of the inner pipe body to achieve the support of the entire inner pipe body.

[0008] Preferably, the cross-section of the support skeleton along the length direction of the inner pipe body is an arched structure, and the opening of the arched structure of the support skeleton faces the inner pipe body.

[0009] Preferably, the support skeleton is further provided with a V-shaped support frame. The top of the V-shaped support frame is connected to the inner wall surface of the arched structure, and the bottom of the V-shaped support frame is connected to the outer wall surface of the inner layer pipe body.

[0010] Preferably, a wear-resistant layer is further provided on the outer side of the corrugated pipe body, and the wear-resistant layer covers the outer surface of the corrugated pipe body.

[0011] Preferably, the wear-resistant layer is a structure of a high molecular polyisocyanate material.

[0012] Preferably, a compressive layer is further provided on the inner side of the inner layer pipe body.

[0013] Preferably, the compressive layer is a structure of a styrene-butadiene rubber material.

[0014] Preferably, a corrosion-resistant layer is further provided on the inner side of the compressive layer.

[0015] Preferably, the corrosion-resistant layer includes a fluororubber layer, and the fluororubber layer is a structure of a fluororubber material.

[0016] Preferably, the corrosion-resistant layer further includes a polytetrafluoroethylene layer. The polytetrafluoroethylene layer is arranged on the inner side of the fluororubber layer, and the polytetrafluoroethylene layer is a structure of a polytetrafluoroethylene material.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows: In the present utility model, by arranging a support skeleton inside the corrugated pipe body, it plays a supporting role in the shape of the corrugated pipe body, making it difficult for the corrugated pipe body and the inner layer pipe body located inside the corrugated pipe body to deform, and improving the compressive resistance of the double-wall corrugated pipe. A plurality of corrugated pipe bodies are provided and are evenly arranged along the length direction of the inner layer pipe body, ensuring that all parts of the inner layer pipe body can be supported by the corrugated pipe bodies. The support skeleton is arranged inside the corrugated pipe body, enabling the corrugated pipe body to play a protective role for the support skeleton, isolating the support skeleton from the outside world, avoiding the support skeleton from coming into contact with the outside and rusting or being corroded, and prolonging the service life of the support skeleton. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the compressive HDPE double-wall corrugated pipe of the present utility model;

[0019] Figure 2 is a cross-sectional view of the corrugated pipe body in the compressive HDPE double-wall corrugated pipe of the present utility model;

[0020] Figure 3 is a cross-sectional view of the corrugated pipe body with a V-shaped support frame in the compressive HDPE double-wall corrugated pipe of the present utility model;

[0021] Figure 4It is a cross-sectional view of the inner pipe body of the compression-resistant HDPE double-wall corrugated pipe of the present utility model.

[0022] In the attached drawings: 1. Inner pipe body; 2. Corrugated pipe body; 3. Support skeleton; 4. Wear-resistant layer; 5. Compression-resistant layer; 6. Corrosion-resistant layer; 31. V-shaped support frame; 61. Fluororubber layer; 62. Polytetrafluoroethylene layer. Specific embodiments

[0023] The attached drawings are only for illustrative purposes and should not be construed as a limitation of this patent; for better illustration of this embodiment, some components in the attached drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted. The description of the positional relationship in the attached drawings is only for illustrative purposes and should not be construed as a limitation of this patent.

[0024] In the attached drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the attached drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the attached drawings are only for illustrative purposes and should not be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] The technical solution of the present utility model will be further specifically described below through specific embodiments and in combination with the attached drawings:

[0026] Embodiment 1

[0027] Such as Figure 1 、 2As shown in the figure, a compressive HDPE double-wall corrugated pipe includes an inner pipe body 1. A corrugated pipe body 2 is wound around the outer wall surface of the inner pipe body 1. There are multiple corrugated pipe bodies 2, and the multiple corrugated pipe bodies 2 are uniformly arranged along the length direction of the inner pipe body 1. A support skeleton 3 is arranged inside the corrugated pipe body 2. The compressive HDPE double-wall corrugated pipe includes the inner pipe body 1 and the corrugated pipe body 2. Among them, the inner pipe body 1 is a hollow tubular structure for conveying fluids. The corrugated pipe body 2 is annular and is arranged on the outer peripheral surface of the inner pipe body 1, playing a supporting role for the shape of the corrugated pipe body 2. When an external pressure is applied to the inner layer, the pressure needs to be applied to the corrugated pipe body 2 first. On the one hand, the corrugated pipe body 2 can offset part of the pressure. On the other hand, when the pressure is applied to the corrugated pipe body 2, it will be evenly dispersed to the inner pipe body 1 by the corrugated pipe body 2, avoiding the situation that the pressure is too concentrated, causing part of the inner pipe body 1 to collapse inward, reducing the space available for fluid flow in the inner pipe body 1, resulting in a slowdown in the flow rate, and even causing the inner pipe body 1 to rupture and the fluid in the pipe to leak. When the pressure inside the inner pipe is relatively large, the inner pipe body 1 is subjected to pressure from the inside to the outside. At this time, the corrugated pipe body 2 plays a role in tightly clamping the inner pipe body 1 on the outside, providing an inward supporting force for the inner pipe body 1 to offset the outward pressure of the inner pipe body 1. When the pressure received is too large, the corrugated pipe body 2 may still be deformed under pressure, and thus lose the supporting effect on the inner pipe body 1. In order to enable the corrugated pipe body 2 to withstand greater pressure, a support skeleton 3 is also arranged inside the corrugated pipe body 2. The support skeleton 3 is made of steel material, has relatively high hardness and good toughness, can withstand higher pressure to support the shape of the corrugated pipe skeleton, and ensure that it will not be deformed. The support skeleton 3 is arranged inside the corrugated pipe body 2, enabling the corrugated pipe body 2 to play a protective role for the support skeleton, isolating the support skeleton 3 from the outside world, avoiding the support skeleton 3 from rusting or being corroded when contacting the outside world, and extending the service life of the support skeleton 3. A single corrugated pipe body 2 can only support the inner pipe body 1 within a certain distance nearby, and the inner pipe body 1 is a long strip-shaped structure. A single corrugated pipe body 2 cannot support the entire inner pipe body 1. Therefore, there are multiple corrugated pipe bodies 2, and the multiple corrugated pipe bodies 2 are uniformly arranged along the length direction of the inner pipe body 1 to achieve the support for the entire inner pipe body 1.

[0028] As Figure 2As shown in the figure, the cross-section of the support skeleton 3 along the length direction of the inner layer pipe body 1 is an arched structure, and the opening of the arched structure of the support skeleton 3 faces the inner layer pipe body 1. The support skeleton 3 is made by rolling a steel strip. On the one hand, the arched structure itself has a good stress structure, is not prone to deformation, and can withstand large pressures. On the other hand, the opening of the arched structure faces the inner layer pipe body 1. When there is an external pressure, the pressure is transmitted from the top of the arched structure to both sides of the opening of the arched structure, and finally transmitted to different positions in the inner layer pipe body 1, realizing the dispersion of the originally concentrated pressure, enabling the inner layer pipe body 1 to be stressed evenly, and not easily deforming and rupturing due to overly concentrated pressure. When there is an internal pressure in the inner layer pipe body 1, both sides of the opening of the arched structure can also support different positions of the inner layer pipe body 1, with a larger support area. At the same time, the arched structure of the support skeleton 3 lifts the corrugated pipe body 2. On the one hand, it supports the shape of the corrugated pipe 1, and on the other hand, the hollow structure can save steel strip materials and reduce the weight.

[0029] As Figure 3 shown in the figure, the support skeleton 3 is also provided with a V-shaped support frame 31. The top of the V-shaped support frame 31 is connected to the inner wall surface of the arched structure, and the bottom of the V-shaped support frame 31 is connected to the outer wall surface of the inner layer pipe body 1. The V-shaped support frame 31 can enhance the support effect on the support skeleton 3, making the structure of the support skeleton 3 more stable and not prone to deformation. At the same time, it is beneficial for the support skeleton 3 to disperse the pressure it bears more evenly, avoiding damage to the inner layer pipe body 1 due to overly concentrated pressure.

[0030] As Figure 2 shown in the figure, a wear-resistant layer 4 is also provided on the outer side of the corrugated pipe body 2, and the wear-resistant layer 4 covers the outer surface of the corrugated pipe body 2. During daily use, the outermost corrugated pipe body 2 will inevitably rub against the outside world. During the friction process, it is possible to cause wear and rupture of the outer surface of the corrugated pipe body 2. On the one hand, it reduces the compressive resistance of the corrugated pipe body 2, and on the other hand, the ruptured corrugated pipe body 2 exposes the support skeleton 3, making the support skeleton 3 prone to rust or be corroded by the outside world, reducing its service life. Therefore, it is necessary to provide a wear-resistant layer 4 on the outer side of the corrugated pipe body 2. The wear-resistant layer 4 plays a protective role for the corrugated pipe body 2, enabling the corrugated pipe body 2 to avoid being worn by directly contacting the outside world, and extending the service life of the corrugated pipe body 2.

[0031] As Figure 2 shown in the figure, the wear-resistant layer 4 is a structure of a polymer polyisocyanate material. The polymer polyisocyanate material is not only tough, wear-resistant, and chemically corrosion-resistant, but also has good flexibility and is easy to adhere to substrates of various shapes, and is suitable for coating on the relatively complex outer surface of the corrugated pipe body 2.

[0032] Embodiment 2

[0033] This embodiment is similar to the above-mentioned Embodiment 1, except that, as Figure 3 shown, an anti-pressure layer 5 is further provided inside the inner pipe body 1. The anti-pressure layer 5 is used to improve the anti-pressure property of the inner pipe body 1, so that the inner pipe body 1 can withstand greater external pressure or impact and is not easily broken. On the other hand, it also enables the inner pipe body 1 to withstand higher internal pressure, and the inner pipe body 1 can transport the fluid in the pipe at a higher flow rate and faster flow velocity.

[0034] As Figure 3 shown, the anti-pressure layer 5 is a styrene-butadiene rubber material structure. The styrene-butadiene rubber material structure has good elasticity and wear resistance, and can withstand the extrusion of high-speed movement and large deformation. At the same time, the linear polymer structure of styrene-butadiene rubber also makes it have a higher tensile strength and can operate stably for a long time in a complex working environment. Therefore, the anti-pressure layer 5 with a styrene-butadiene rubber material structure has good anti-pressure ability, can prevent the extrusion damage of the inner pipe body 1 by soil, sand, concrete, etc. during the processes of flowing, collapsing, thermal expansion and contraction, etc., can play a role of "absorbing" pressure, and improves the strength and toughness of the inner pipe body 1.

[0035] Embodiment 3

[0036] This embodiment is similar to the above-mentioned Embodiment 1, except that, as Figure 3 shown, a corrosion-resistant layer 6 is further provided inside the anti-pressure layer 5. In pipeline transportation, it is often necessary to transport relatively dangerous fluids, and some fluids are corrosive. The inner pipe body 1 and the anti-pressure layer 5 are easily corroded by the corrosive fluids, which may cause phenomena such as pipe body perforation. On the one hand, the fluid leakage caused by the pipe body perforation will increase the loss of the fluid during transportation and increase the transportation cost. On the other hand, due to the corrosiveness of the fluid, it will pollute the environment at the pipe leakage point and even cause harm to the human body, affecting the safety of fluid transportation. Therefore, a corrosion-resistant layer 6 is provided at the innermost part of the pipeline. The corrosion-resistant layer 6 is in direct contact with the fluid being transported, and the corrosion-resistant layer 6 separates the anti-pressure layer 5, the inner pipe body 1 from the fluid being transported, avoiding the corrosion of the anti-pressure layer 5 and the inner pipe body 1 by the corrosive fluid and ensuring the safety of the transported fluid.

[0037] As Figure 3 shown, the corrosion-resistant layer 6 includes a fluororubber layer 61, and the fluororubber layer 61 is a fluororubber material structure. The fluororubber layer 61 can play roles such as resisting acids, alkalis, salts, organic solvents, etc., to achieve the purpose of preventing the anti-pressure layer 5 and the inner pipe body 1 from being corroded.

[0038] As Figure 3As shown, the corrosion-resistant layer 6 further includes a polytetrafluoroethylene layer 62, which is provided inside the fluororubber layer 61, and the polytetrafluoroethylene layer 62 has a polytetrafluoroethylene material structure. The polytetrafluoroethylene layer 62 can further play a role in corrosion resistance and fire protection.

[0039] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A compression-resistant HDPE double-wall corrugated pipe, characterized in that, It includes an inner tube body (1), and a corrugated tube body (2) is wound around the outer wall surface of the inner tube body (1). There are a plurality of the corrugated tube bodies (2), and the plurality of the corrugated tube bodies (2) are arranged at equal intervals along the length direction of the inner tube body (1). The corrugated tube body (2) is a hollow structure, and a support skeleton (3) that fits the inner wall surface of the corrugated tube body (2) is arranged inside the corrugated tube body (2).

2. The anti-pressure HDPE double-wall corrugated pipe according to claim 1, wherein The cross-section of the support skeleton (3) along the length direction of the inner tube body (1) is an arched structure, and the opening of the arched structure of the support skeleton (3) faces the inner tube body (1).

3. The anti-pressure HDPE double-wall corrugated pipe according to claim 2, wherein The support skeleton (3) is further provided with a V-shaped support frame (31). The top of the V-shaped support frame (31) is connected to the inner wall surface of the arched structure, and the bottom of the V-shaped support frame (31) is connected to the outer wall surface of the inner tube body (1).

4. A compression-resistant HDPE double-wall corrugated pipe according to claim 1, characterized in that, A wear-resistant layer (4) is further arranged on the outer side of the corrugated tube body (2), and the wear-resistant layer (4) covers the outer surface of the corrugated tube body (2).

5. A compressive HDPE double-wall corrugated pipe according to claim 4, characterized in that, The wear-resistant layer (4) is a structure of a polymer polyisocyanate material.

6. The anti-pressure HDPE double-wall corrugated pipe according to claim 1, characterized in that, An anti-pressure layer (5) is further arranged inside the inner tube body (1).

7. The anti-pressure HDPE double-wall corrugated pipe according to claim 6, characterized in that, The anti-pressure layer (5) is a structure of a styrene-butadiene rubber material.

8. A compressive HDPE double-wall corrugated pipe according to claim 6, characterized in that, A corrosion-resistant layer (6) is further arranged inside the anti-pressure layer (5).

9. The anti-pressure HDPE double-wall corrugated pipe according to claim 8, characterized in that, The corrosion-resistant layer (6) includes a fluororubber layer (61), and the fluororubber layer (61) is a structure of a fluororubber material.

10. A compression-resistant HDPE double-wall corrugated pipe according to claim 9, characterized in that, The corrosion-resistant layer (6) further includes a polytetrafluoroethylene layer (62). The polytetrafluoroethylene layer (62) is arranged inside the fluororubber layer (61), and the polytetrafluoroethylene layer (62) is a structure of a polytetrafluoroethylene material.

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