Thermal shrinkage sealing connection pipe fitting and pipe fitting assembly

Abstract

The utility model belongs to the technical field of connecting pipe fittings, and particularly relates to a thermal shrinkage sealing connecting pipe fitting and a pipe fitting assembly, which comprise a pipe fitting body, the pipe fitting body is provided with a port, an internal thread is arranged on the inner side wall of the pipe fitting body close to the port, the outside of the pipe fitting body is coated with a cross-linked polyethylene insulating anti-corrosion layer, and the cross-linked polyethylene insulating anti-corrosion layer is coated with an anti-corrosion layer. And the end part of the cross-linked polyethylene insulating anti-corrosion layer extends towards one end far away from the port to form a thermal shrinkage sealing pipe section. The cross-linked polyethylene insulating anti-corrosion layer is arranged outside the heat-shrinkable sealing connecting pipe fitting, the service life is longer and can reach more than 50 years, the heat-shrinkable sealing pipe section has a shape memory function through heating expansion after radiation cross-linking, the heat-shrinkable sealing pipe section can wrap the outer side of a polyethylene anti-corrosion steel pipe in a heat-shrinkable mode, the sealing effect is achieved, and the service life of the heat-shrinkable sealing connecting pipe fitting is prolonged. External rainwater and the like are prevented from entering the threaded connection position between the thermal shrinkage sealing connection pipe fitting and the polyethylene anti-corrosion steel pipe to corrode threads, and the cross-linked polyethylene material has good insulation performance.

Description

Technical Field

[0001] This utility model relates to the field of connecting pipe fittings technology, specifically a heat-shrinkable sealing connecting pipe fitting and pipe fitting assembly. Background Technology

[0002] Overhead pipelines are piping systems installed on the ground or elevated structures to transport various liquids or gases. They typically consist of pipes, fittings, and supports, and can be suspended from structures such as bridges, towers, and supports. Overhead pipelines are widely used in industries such as oil, natural gas, chemicals, and power, offering advantages such as cost savings, high flexibility, and strong scalability.

[0003] Existing overhead pipelines generally use galvanized pipes. However, for galvanized pipes used outdoors as overhead pipelines, due to corrosion from rainwater and air, as well as photoaging caused by outdoor ultraviolet radiation, the maximum service life of galvanized pipes is only 15-25 years. On the other hand, overhead pipelines used at high altitudes outdoors are inconvenient to inspect and replace due to their height.

[0004] When connecting galvanized pipes to fittings, PTFE-Teflon tape is typically used to wrap the threads before connecting the galvanized pipe and fittings. During use, rainwater can easily enter the threads from the outside, corroding them and weakening the seal between the galvanized pipe and fittings. Utility Model Content

[0005] The purpose of this utility model is to provide a heat-shrinkable sealing connection pipe fitting and pipe fitting assembly to solve the problems mentioned in the background art.

[0006] To achieve the above-mentioned technical objectives, the technical solution of this utility model is as follows:

[0007] A heat-shrinkable sealing pipe fitting includes a pipe body, the pipe body having a port, an internal thread on the inner side wall of the pipe body near the port, and the outside of the pipe body being covered with a cross-linked polyethylene insulating and anti-corrosion layer, the end of the cross-linked polyethylene insulating and anti-corrosion layer extending toward the end away from the port to form a heat-shrinkable sealing pipe section.

[0008] As an improvement, the port of the fitting body is provided with a sloping end wall, and the inner side wall of the heat-shrinkable sealing pipe section extends to the sloping end wall at the end near the port.

[0009] As a further improvement, the cross-linked polyethylene insulating and anti-corrosion layer and the heat-shrinkable sealing pipe section are integrally formed.

[0010] As a further improvement, both the port and the heat-shrinkable sealing tube section may have one, two, three, or four sections.

[0011] As a further improvement, the length of the heat-shrinkable sealing tube section is greater than 1 cm, and the thickness of the cross-linked polyethylene insulating and anti-corrosion layer is 0.5 mm to 2.5 mm.

[0012] As a further improvement, an adhesive layer is provided on the inner wall of the heat-shrinkable sealing tube section.

[0013] This utility model also provides a heat-shrinkable sealing connection pipe assembly, including a heat-shrinkable sealing connection pipe, wherein a polyethylene anti-corrosion steel pipe is threadedly connected to the inner side of the port, and the heat-shrinkable sealing pipe section covers the outer side of the polyethylene anti-corrosion steel pipe.

[0014] As a further improvement, the polyethylene anti-corrosion steel pipe includes a steel pipe and a polyethylene anti-corrosion layer covering the outside of the steel pipe.

[0015] Due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows:

[0016] The heat-shrinkable sealing pipe fitting and pipe assembly provided by this utility model prevent fluid leakage inside the polyethylene anti-corrosion steel pipe through the threaded connection between the heat-shrinkable sealing pipe fitting and the polyethylene anti-corrosion steel pipe. The heat-shrinkable sealing pipe fitting is provided with a cross-linked polyethylene insulating and anti-corrosion layer on the outside, which has a longer service life, reaching more than 50 years. After radiation cross-linking and heating expansion, the heat-shrinkable sealing and anti-corrosion layer has a shape memory function, which can heat-shrink and cover the outside of the polyethylene anti-corrosion steel pipe, playing a sealing role and preventing external rainwater, air and other external factors from entering the threaded connection position between the heat-shrinkable sealing pipe fitting and the polyethylene anti-corrosion steel pipe and corroding the threads. In addition, the cross-linked polyethylene material has good insulation properties. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of Example 1;

[0018] Figure 2 yes Figure 1 Enlarged view of section A;

[0019] Figure 3 This is a cross-sectional view of Example 2;

[0020] Figure 4 yes Figure 3 Enlarged view of section B.

[0021] Wherein: 1-pipe body, 2-port, 3-internal thread, 4-crosslinked polyethylene insulation and anti-corrosion layer, 5-heat shrinkable sealing pipe section, 6-sloping end wall, 7-polyethylene anti-corrosion steel pipe, 8-steel pipe, 9-polyethylene anti-corrosion layer, 10-straight end wall. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments and accompanying drawings. The accompanying drawings are for illustrative purposes only, representing schematic diagrams only, not actual physical objects, and should not be construed as limiting the scope of this application. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0023] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. Example 1

[0024] like Figure 1-2 As shown, a heat-shrinkable sealing pipe fitting includes a pipe body 1, a port 2, and an internal thread 3 on the inner wall of the pipe body 1 near the port 2 for threaded connection with a polyethylene anti-corrosion steel pipe. The outside of the pipe body 1 is covered with a cross-linked polyethylene insulating and anti-corrosion layer 4, and the end of the cross-linked polyethylene insulating and anti-corrosion layer 4 extends toward the end away from the port to form a heat-shrinkable sealing pipe section 5.

[0025] The outer wall of the fitting body 1 near the port protrudes from the inner wall. The end wall of the port of the fitting body extends from the inner wall to the outer wall to form a sloping end wall 6. The end of the sloping end wall away from the inner wall extends perpendicularly to the central axis of the port toward the outer wall to form a straight end wall 10. The end of the inner wall of the heat-shrinkable sealing pipe section near the port extends to the sloping end wall, and the heat-shrinkable sealing pipe section covers the straight end wall 10.

[0026] In this embodiment, the pipe body 1 is provided with three ports 2, that is, the pipe body forms a tee pipe. In actual production, the number of ports can also be one, two or four, that is, the pipe body can be a plug pipe, a diameter pipe, an elbow pipe or a four-way pipe.

[0027] In this embodiment, the length of the heat-shrinkable sealing tube section 5 is greater than 1 cm, and the thickness of the cross-linked polyethylene insulating and anti-corrosion layer 4 is 0.5 mm to 2.5 mm.

[0028] In this embodiment, the cross-linked polyethylene insulating and anti-corrosion layer 4 and the heat-shrinkable sealing pipe section 5 are integrally formed.

[0029] In this embodiment, the heat-shrinkable sealing tube section 5 forms an annular structure.

[0030] In this embodiment, both the cross-linked polyethylene insulating and anti-corrosion layer 4 and the heat-shrinkable sealing tube section 5 are radiation-crosslinked polyethylene materials, and the heat-shrinkable sealing tube section 5 is a radiation-crosslinked polyethylene material with shape memory function.

[0031] In the actual production process, the cross-linked polyethylene insulating and anti-corrosion layer 4 and the heat-shrinkable sealing pipe section 5 are first integrally formed on the outside of the pipe body 1. Then, radiation cross-linking is carried out to improve the temperature resistance, mechanical strength and chemical solvent resistance of the cross-linked polyethylene insulating and anti-corrosion layer 4 and the heat-shrinkable sealing pipe section 5. After the radiation cross-linking is completed, the heat-shrinkable sealing pipe section is heated and expanded. After it cools down, the heat-shrinkable sealing connection pipe of this embodiment is formed, so that the heat-shrinkable sealing pipe section has shape memory function. At this time, the heat-shrinkable sealing pipe section has the function of heat shrinking. Example 2

[0032] like Figure 3-4 As shown, this embodiment provides a heat-shrinkable sealing connection pipe assembly, including the heat-shrinkable sealing connection pipe assembly prepared in embodiment 1. The inner side of each port is threaded with a polyethylene anti-corrosion steel pipe 7. The polyethylene anti-corrosion steel pipe 7 includes a steel pipe 8 and a polyethylene anti-corrosion layer 9 covering the outside of the steel pipe. The heat-shrinkable sealing pipe section 5 is covered on the outside of the polyethylene anti-corrosion layer of the polyethylene anti-corrosion steel pipe.

[0033] In this embodiment, the heat-shrinkable sealing pipe section is wrapped around the outside of the polyethylene anti-corrosion steel pipe by heat shrinking.

[0034] Specifically, in the production of heat-shrinkable sealing pipe fittings, a cross-linked polyethylene insulating and anti-corrosion layer 4 and a heat-shrinkable sealing pipe section 5 are first formed on the outside of the pipe fitting body 1 by integral injection molding. During this process, the inner diameter of the heat-shrinkable sealing pipe section 5 is smaller than the outer diameter of the polyethylene anti-corrosion steel pipe 7. Then, the cross-linked polyethylene insulating and anti-corrosion layer 4 and the heat-shrinkable sealing pipe section 5 are subjected to radiation cross-linking. After the radiation cross-linking is completed, the heat-shrinkable sealing pipe section 5 is heated and expanded so that the inner diameter of the heat-shrinkable sealing pipe section 5 is larger than the outer diameter of the polyethylene anti-corrosion steel pipe 7. After the heat-shrinkable sealing pipe section 5 cools down, its inner diameter is still larger than the outer diameter of the polyethylene anti-corrosion steel pipe 7. However, the cooled heat-shrinkable sealing pipe section 5 has a shape memory function.

[0035] In use, the polyethylene anti-corrosion steel pipe is inserted into the port of the heat-shrinkable sealing fitting, and the two are connected by threads. Then, the outside of the heat-shrinkable sealing section 5 is heated so that the heat-shrinkable sealing section is heat-shrinkably wrapped around the outside of the polyethylene anti-corrosion steel pipe to seal it and prevent external rainwater, air, etc. from entering between the heat-shrinkable sealing fitting and the polyethylene anti-corrosion steel pipe and corroding the threads.

[0036] During the injection molding process of the heat-shrinkable sealing connection fitting, the inner diameter of the heat-shrinkable sealing section 5 is smaller than the outer diameter of the polyethylene anti-corrosion steel pipe 7, so that it can be tightly sealed to the outside of the polyethylene anti-corrosion steel pipe when it is heat-shrinkably wrapped, resulting in better sealing performance. During the heating and expansion process, the inner diameter of the heat-shrinkable sealing section is made larger than the outer diameter of the polyethylene anti-corrosion steel pipe, so that the polyethylene anti-corrosion steel pipe can be smoothly inserted into the port during the connection with the heat-shrinkable sealing connection fitting. Example 3

[0037] This embodiment provides a heat-shrinkable sealing connection pipe fitting, which has the same structure as Embodiment 1. The difference is that the inner side of the heat-shrinkable sealing pipe section in this embodiment is provided with an adhesive layer.

[0038] The heat-shrinkable sealing fitting of this embodiment can be used with steel pipes that are not covered with a polyethylene anti-corrosion layer. The heat-shrinkable sealing pipe section is covered and sealed on the outer wall of the steel pipe through an adhesive layer to achieve a seal.

[0039] This utility model relates to heat-shrinkable sealing pipe fittings and pipe fitting assemblies. Through the threaded connection between the heat-shrinkable sealing pipe fitting and the polyethylene anti-corrosion steel pipe, it prevents fluid leakage inside the polyethylene anti-corrosion steel pipe. The heat-shrinkable sealing pipe fitting is provided with a cross-linked polyethylene insulating and anti-corrosion layer on the outside, which has a longer service life, reaching more than 50 years. After radiation cross-linking and heating expansion, the heat-shrinkable sealing pipe section has a memory function, which can heat-shrink and cover the outside of the polyethylene anti-corrosion steel pipe, thus playing a sealing role and preventing external rainwater and other substances from entering the threaded connection position between the heat-shrinkable sealing pipe fitting and the polyethylene anti-corrosion steel pipe and corroding the threads. In addition, the cross-linked polyethylene material has good insulation properties.

[0040] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A heat-shrinkable sealing pipe fitting, comprising a fitting body, characterized in that, The pipe body has a port, and an internal thread is provided on the inner side wall of the pipe body near the port. The outside of the pipe body is covered with a cross-linked polyethylene insulation and anti-corrosion layer, and the end of the cross-linked polyethylene insulation and anti-corrosion layer extends toward the end away from the port to form a heat-shrinkable sealing pipe section.

2. The heat-shrinkable sealing pipe fitting according to claim 1, characterized in that, The pipe body has a sloping end wall at the port, and the inner side wall of the heat-shrinkable sealing pipe section extends to the sloping end wall at the end near the port.

3. The heat-shrinkable sealing pipe fitting according to claim 2, characterized in that, The cross-linked polyethylene insulating and anti-corrosion layer and the heat-shrinkable sealing pipe section are integrally formed.

4. The heat-shrinkable sealing pipe fitting according to claim 1, characterized in that, The port and the heat-shrinkable sealing tube section each have one, two, three, or four.

5. The heat-shrinkable sealing pipe fitting according to any one of claims 1-4, characterized in that, The length of the heat-shrinkable sealing tube section is greater than 1 cm, and the thickness of the cross-linked polyethylene insulating and anti-corrosion layer is 0.5 mm to 2.5 mm.

6. The heat-shrinkable sealing pipe fitting according to claim 5, characterized in that, An adhesive layer is provided on the inner wall of the heat-shrinkable sealing tube section.

7. A heat-shrinkable sealing pipe fitting assembly, characterized in that, The device includes the heat-shrinkable sealing connection fitting as described in claim 1, wherein a polyethylene anti-corrosion steel pipe is threaded to the inner side of the port, and the heat-shrinkable sealing pipe section covers the outer side of the polyethylene anti-corrosion steel pipe.

8. The heat-shrinkable sealing connection pipe assembly according to claim 7, characterized in that, The polyethylene anti-corrosion steel pipe includes a steel pipe and a polyethylene anti-corrosion layer covering the outside of the steel pipe.

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