Multi-layer polyethylene reinforced pipe fitting

Abstract

The utility model provides a multilayer polyethylene reinforcing pipe fitting, which solves the problem that a single-layer pipe body is poor in structural strength and the like and comprises an inner pipe body and an outer pipe body, inserting strips which are arranged in a central symmetry mode are arranged on the outer side of the inner pipe body, inserting grooves for the inserting strips to be inserted in a sliding mode are formed in the inner side of the outer pipe body, and reinforcing pieces are filled in the outer pipe body and the inner pipe body. The reinforcing pieces are made of elastic materials and are in a wave shape in the axial direction, and the upper ends and the lower ends of the reinforcing pieces are attached to the outer pipe body and the inner pipe body in a pressed mode respectively and apply pre-tightening force. The utility model has the advantages of high structural strength, good bending resistance and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of transmission pipelines, and specifically relates to a multi-layer polyethylene reinforced pipe fitting. Background Art

[0002] Polyethylene PE pipe is a water supply pipe made of polyethylene resin as the main raw material and formed by extrusion. No metal salt stabilizer is added during the processing of PE pipe. The material is non-toxic, has no scaling layer, and does not breed bacteria. Its pipe connection methods are divided into fusion connection pipes, mechanical connection pipes, and flange connection pipes. It has the advantages of light weight, simple welding process, convenient construction, and low comprehensive engineering cost. It is mainly used in indoor and outdoor low-temperature water supply pipelines. However, in actual use, the single-layer pipe body has poor structural strength and poor bending resistance, and is prone to breakage. In addition, its thermal insulation effect is poor and it cannot be used in areas with lower temperatures.

[0003] In order to solve the deficiencies of the prior art, people have conducted long-term exploration and proposed various solutions. For example, a Chinese patent document discloses a polyethylene branch pipe [201711031065.2], which includes a polyethylene branch pipe body, a rosin ester layer is arranged on the inner side of the polyethylene branch pipe body, a polytetrafluoroethylene layer is arranged on the inner side of the rosin ester layer, an aluminum skeleton braided layer is arranged on the outer side of the polyethylene branch pipe body, a hot melt adhesive layer is arranged on the outer side of the aluminum skeleton braided layer, a high-density polyethylene outer layer is arranged on the outer side of the hot melt adhesive layer, a plurality of high-density polyethylene reinforcing ribs are evenly arranged longitudinally on the outer side of the high-density polyethylene outer layer, the high-density polyethylene reinforcing ribs are spirally wound on the outer side of the high-density polyethylene outer layer, an ultraviolet absorber layer is arranged on the high-density polyethylene outer layer between two adjacent high-density polyethylene reinforcing ribs, and copper wires are respectively passed through the high-density polyethylene reinforcing ribs.

[0004] The above solution solves the problem of polyethylene pipes working in low temperature environments to a certain extent, but the solution still has many shortcomings, such as poor anti-bending performance. Summary of the invention

[0005] The utility model aims to solve the above problems and provide a multi-layer polyethylene reinforced pipe with reasonable design and good anti-bending performance.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a multi-layer polyethylene reinforced pipe fitting, including an inner pipe body and an outer pipe body, the outer side of the inner pipe body is provided with plug-in strips arranged in a central symmetrical manner, the inner side of the outer pipe body is provided with plug-in grooves for the plug-in strips to slide and plug in, the outer pipe body and the inner pipe body are filled with reinforcement sheets, the reinforcement sheets are made of elastic material and are wavy along the axial direction, and the upper and lower ends of the reinforcement sheets are respectively pressed against the outer pipe body and the inner pipe body and a pre-tightening force is applied.

[0007] In the above-mentioned multi-layer polyethylene reinforced pipe fitting, the inner tube body and the outer tube body are made of polyethylene material, the thickness of the inner tube body is greater than that of the outer tube body, the thickness of the inner tube body is 2.0-3.0mm, the thickness of the outer tube body is 1.5-2.4mm, and an axial limiting structure is arranged between the plug-in strip and the plug-in groove.

[0008] In the above-mentioned multi-layer polyethylene reinforced pipe, the axial limiting structure includes limiting ribs arranged at the bottom of the plug-in slot, the limiting ribs are arranged equidistantly along the axial direction of the plug-in slot, and the top of the plug-in strip is provided with limiting grooves that correspond to the limiting ribs one by one.

[0009] In the above-mentioned multi-layer polyethylene reinforced pipe, the outer pipe body includes a plurality of branch pipe bodies connected end to end along the axial direction, a sealing component is arranged between the branch pipe bodies, and a supporting component is arranged between the branch pipe bodies and the reinforcement sheet.

[0010] In the above-mentioned multi-layer polyethylene reinforced pipe fitting, the sealing assembly includes an outer sleeve arranged at the end of a branch pipe body, and the other end of the branch pipe body is provided with an inner sleeve that fits and presses against the inner side of the outer sleeve, and the end of the inner sleeve body and the inner side of the outer sleeve are provided with a sealing step surface that fits and presses against each other.

[0011] In the above-mentioned multi-layer polyethylene reinforced pipe, the support assembly includes a support surface arranged inside the branch pipe body, the support surface is arc-shaped and fits tightly against the reinforcement sheet, and a support edge is provided at the end of the branch pipe body to press against the end of the reinforcement sheet.

[0012] In the above-mentioned multi-layer polyethylene reinforced pipe, the inner side of the inner pipe body is covered with a sound insulation layer made of random copolymer polypropylene, and the thickness of the sound insulation layer is 1.0-1.8 mm.

[0013] In the above-mentioned multi-layer polyethylene reinforced pipe, the inner side of the sound insulation layer is covered with an anti-corrosion layer made of polyvinyl chloride, and the thickness of the anti-corrosion layer is 0.4-1.2 mm.

[0014] In the above-mentioned multi-layer polyethylene reinforced pipe, the outer side of the outer pipe body is coated with a heat-insulating layer made of polyurethane material, and the thickness of the heat-insulating layer is 4.5-7.8 mm.

[0015] In the above-mentioned multi-layer polyethylene reinforced pipe fitting, hot melt adhesive is filled between the reinforcement sheet and the inner pipe body and the outer pipe body.

[0016] Compared with the existing technology, the advantages of the utility model are: the reinforcing plate presses against the inner tube body and the outer tube body and applies a pre-tightening force, thereby improving the deformation resistance of the pipe fittings and preventing them from breaking when subjected to a bending moment; the outer tube body is composed of a plurality of branch tube bodies, which is convenient for assembly with the inner tube body one by one, reducing the difficulty of assembly; the pipe fittings adopt a composite structure, and structures such as a built-in sound insulation layer improve the quality of the pipe fittings and extend their service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is a structural sectional view of the utility model;

[0019] Figure 3 It is a partial cross-sectional view of the utility model;

[0020] Figure 4 It is another partial cross-sectional view of the utility model;

[0021] In the figure, inner tube body 1, sound insulation layer 11, anti-corrosion layer 12, thermal insulation layer 13, outer tube body 2, branch tube body 21, outer sleeve body 22, inner sleeve body 23, sealing step surface 24, supporting surface 25, supporting edge 26, plug strip 3, plug groove 4, reinforcing plate 5, axial limiting structure 6, limiting rib 61, limiting groove 62. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figure 1-4 As shown, a multi-layer polyethylene reinforced pipe fitting comprises an inner pipe body 1 and an outer pipe body 2 with a sandwich structure. A plug-in strip 3 arranged in a central symmetrical manner is arranged on the outer side of the inner pipe body 1, and a plug-in groove 4 for the plug-in strip 3 to be slidably inserted is opened on the inner side of the outer pipe body 2. The plug-in strip 3 is arranged in a central symmetrical manner to keep the inner pipe body 1 and the outer pipe body 2 separated. The outer pipe body 2 and the inner pipe body 1 are filled with a reinforcing sheet 5 to improve their radial structural strength. The reinforcing sheet 5 is made of elastic material and is wavy along the axial direction. The upper and lower ends of the reinforcing sheet 5 are respectively pressed against the outer pipe body 2 and the inner pipe body 1 and a pre-tightening force is applied. When the pipe fitting receives an external bending moment, the sandwich structure and the reinforcing sheet 5 inside it provide additional supporting torque to prevent it from breaking.

[0024] Specifically, the inner tube body 1 and the outer tube body 2 are made of polyethylene, the thickness of the inner tube body 1 is greater than that of the outer tube body 2, the thickness of the inner tube body 1 is 2.0-3.0 mm, the thickness of the outer tube body 2 is 1.5-2.4 mm, and an axial limiting structure 6 is arranged between the plug strip 3 and the plug slot 4. The thickness of the inner tube body 1 is usually 2.5 mm, and the thickness of the outer tube body 2 is 2.0 mm. The axial limiting structure 6 prevents the inner tube body 1 and the outer tube body 2 from axial movement after assembly.

[0025] In depth, different from the conventional limiting structure, the axial limiting structure 6 in the present application includes limiting ribs 61 arranged at the bottom of the plug-in slot 4, the limiting ribs 61 are arranged equidistantly along the axial direction of the plug-in slot 4, and the top of the plug-in strip 3 is provided with limiting grooves 62 corresponding to the limiting ribs 61. During assembly, the plug-in strip 3 is slidably plugged into the plug-in slot 4, and since the inner tube body 1 and the outer tube body 2 have a certain elasticity, it is ensured that the limiting ribs 61 and the limiting grooves 62 can be meshed and pressed.

[0026] Furthermore, in order to realize modular assembly of the outer tube body 2, the outer tube body 2 includes a plurality of branch tube bodies 21 connected end to end along the axial direction, sealing components are arranged between the branch tube bodies 21 for nesting one by one, and a supporting component is arranged between the branch tube bodies 21 and the reinforcing plate 5 to maintain the assembly stability of the reinforcing plate 5.

[0027] Furthermore, the sealing assembly includes an outer sleeve 22 disposed at the end of the branch pipe body 21, an inner sleeve 23 is disposed at the end of the other branch pipe body 21 and is pressed against the inner side of the outer sleeve 22, and a sealing step surface 24 is disposed at the end of the inner sleeve 23 and against the inner side of the outer sleeve 22, and when the inner sleeve 23 is fully inserted into the outer sleeve 22, the sealing step surface 24 is pressed against the inner side of the outer sleeve 22. The plug-in slot 4 on the inner side of the branch pipe body 21 is connected after the sealing step surface 24 is pressed against the inner side of the branch pipe body 21.

[0028] In addition, the support assembly includes a support surface 25 arranged on the inner side of the branch pipe body 21. The support surface 25 is arc-shaped and fits tightly with the reinforcing sheet 5. The curvature of the support surface 25 is consistent with the curvature of the bending part of the reinforcing sheet 5. A support edge 26 is provided at the end of the branch pipe body 21 to press against the end of the reinforcing sheet 5. The support edge 26 is raised relative to the branch pipe body 21 to limit the axial position of the reinforcing sheet 5.

[0029] Meanwhile, the inner side of the inner tube body 1 is covered with a sound insulation layer 11 made of random copolymer polypropylene, and the thickness of the sound insulation layer 11 is 1.0-1.8 mm. Usually, a sound insulation layer 11 with a thickness of 1.4 mm is selected to reduce the transmission noise inside the tube body.

[0030] It can be seen that in order to improve the corrosion resistance of the pipe body, the inner side of the sound insulation layer 11 is covered with an anti-corrosion layer 12 made of polyvinyl chloride. The thickness of the anti-corrosion layer 12 is 0.4-1.2 mm, and a 0.8 mm thick anti-corrosion layer 12 is usually selected. The anti-corrosion layer 12 can also be made of other modified polyethylene materials.

[0031] Obviously, the outer side of the outer tube body 2 is covered with a heat-insulating layer 13 made of polyurethane. The thickness of the heat-insulating layer 13 is 4.5-7.8 mm, and a heat-insulating layer 13 with a thickness of 6.5 mm is preferably selected. In addition to playing a heat-insulating role, it also protects the surface of the outer tube body 2 and has a certain buffering effect.

[0032] Preferably, hot melt adhesive is filled between the reinforcing sheet 5 and the inner tube body 1 and the outer tube body 2. Under normal conditions, a cavity structure is left between the inner tube body 1 and the outer tube body 2. In order to further improve its buffering performance, hot melt adhesive is introduced. After solidification, the reinforcing sheet 5 is fixed and is evenly dispersed when receiving external impact torque.

[0033] In summary, the principle of this embodiment is that the inner tube body 1 and the outer tube body 2 are supported by the reinforcing sheet 5, and the double-layer structure of the tube body maintains the structural stability of the reinforced tube. When subjected to bending moment, the inner connector strip 3 further improves its structural strength.

[0034] The specific embodiments described herein are merely examples of the spirit of the present invention. A person skilled in the art of the present invention may make various modifications or additions to the specific embodiments described or replace them in a similar manner, but this will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0035] Although this article uses more terms such as inner tube body 1, sound insulation layer 11, anti-corrosion layer 12, thermal insulation layer 13, outer tube body 2, branch tube body 21, outer sleeve body 22, inner sleeve body 23, sealing step surface 24, support surface 25, support edge 26, plug strip 3, plug slot 4, reinforcement sheet 5, axial limiting structure 6, limiting rib 61, limiting slot 62, etc., it does not exclude the possibility of using other terms. The use of these terms is only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A multi-layer polyethylene reinforced pipe, comprising an inner pipe body (1) and an outer pipe body (2), wherein the outer side of the inner pipe body (1) is provided with plug-in strips (3) arranged in a central symmetrical manner, and the inner side of the outer pipe body (2) is provided with plug-in grooves (4) for sliding plugging of the plug-in strips (3), characterized in that: The outer tube body (2) and the inner tube body (1) are filled with a reinforcing sheet (5), the reinforcing sheet (5) is made of elastic material and is wavy in the axial direction, and the upper and lower ends of the reinforcing sheet (5) are respectively pressed against the outer tube body (2) and the inner tube body (1) and a pre-tightening force is applied.

2. A multi-layer polyethylene reinforced pipe according to claim 1, characterized in that: The inner tube body (1) and the outer tube body (2) are made of polyethylene material. The thickness of the inner tube body (1) is greater than that of the outer tube body (2). The thickness of the inner tube body (1) is 2.0-3.0 mm, and the thickness of the outer tube body (2) is 1.5-2.4 mm. An axial limiting structure (6) is arranged between the plug-in strip (3) and the plug-in groove (4).

3. A multi-layer polyethylene reinforced pipe according to claim 2, characterized in that: The axial limiting structure (6) comprises limiting ribs (61) arranged at the bottom of the plug-in slot (4), the limiting ribs (61) are arranged equidistantly along the axial direction of the plug-in slot (4), and the top of the plug-in strip (3) is provided with limiting grooves (62) which are engaged with the limiting ribs (61) in a one-to-one correspondence.

4. A multi-layer polyethylene reinforced pipe according to claim 1, characterized in that: The outer tube body (2) comprises a plurality of branch tube bodies (21) connected end to end along the axial direction, a sealing component is arranged between the branch tube bodies (21), and a supporting component is arranged between the branch tube bodies (21) and the reinforcing sheet (5).

5. A multi-layer polyethylene reinforced pipe according to claim 4, characterized in that: The sealing assembly comprises an outer sleeve (22) arranged at the end of a branch pipe body (21), an inner sleeve (23) which fits tightly against the inner side of the outer sleeve (22) is arranged at the end of the other branch pipe body (21), and a sealing step surface (24) which fits tightly against the inner side of the outer sleeve (22) is arranged at the end of the inner sleeve (23).

6. A multi-layer polyethylene reinforced pipe according to claim 4, characterized in that: The support assembly comprises a support surface (25) arranged on the inner side of the branch pipe body (21); the support surface (25) is arc-shaped and fits tightly against the reinforcing sheet (5); and a support edge (26) is provided at the end of the branch pipe body (21) to press against the end of the reinforcing sheet (5).

7. The multi-layer polyethylene reinforced pipe according to claim 1, characterized in that: The inner side of the inner tube body (1) is covered with a sound insulation layer (11) made of random copolymer polypropylene, and the thickness of the sound insulation layer (11) is 1.0-1.8 mm.

8. A multi-layer polyethylene reinforced pipe according to claim 7, characterized in that: The inner side of the sound insulation layer (11) is covered with an anti-corrosion layer (12) made of polyvinyl chloride, and the thickness of the anti-corrosion layer (12) is 0.4-1.2 mm.

9. The multi-layer polyethylene reinforced pipe according to claim 1, characterized in that: The outer side of the outer tube body (2) is coated with a heat-insulating layer (13) made of polyurethane material, and the thickness of the heat-insulating layer (13) is 4.5-7.8 mm.

10. The multi-layer polyethylene reinforced pipe according to claim 1, characterized in that: Hot melt adhesive is filled between the reinforcing sheet (5) and the inner tube body (1) and the outer tube body (2).

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