A pipe connection structure

Abstract

This utility model relates to the field of pipeline connection technology, and more specifically, to a pipeline connection structure, including a pipeline, an outer liner, and an inner liner. The outer wall of the inner liner is connected to the inner wall of the pipeline, and the outer liner is connected to the outer wall of the pipeline. The outer liners on the two pipelines to be connected have outer ends at their adjacent ends, the outer diameter of which is larger than the outer diameter of the outer liner. The two inner liners have inner ends at their adjacent ends, located between the two pipelines. The two outer ends are connected to each other, and a first sealing element is provided between the two outer ends. A second sealing element is provided between the outer wall of the inner end and the inner wall of the outer liner, forming a double seal that effectively prevents media leakage and solves the problem of insufficient sealing performance of traditional connections under high pressure.

Description

Technical Field

[0001] This utility model relates to the field of pipe connection technology, and more specifically, to a pipe connection structure. Background Technology

[0002] Polyethylene (PE) fiberglass composite pipe, also known as fiberglass pipe, is a new type of pipe made of high-density polyethylene (HDPE) and other plastic materials combined with glass fiber. This type of pipe combines the corrosion resistance of plastic pipes with the high strength of glass fiber, and is widely used in petroleum, natural gas, chemical, and water supply and drainage industries. Although polyethylene (PE) fiberglass composite pipe exhibits excellent material properties, its widespread application is still limited by pipe connection technology. Existing connection technologies struggle to meet sealing requirements under high-pressure environments. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology in terms of poor sealing performance under high pressure, and to provide a pipe connection structure that can improve the sealing performance of the connection structure under high pressure and reduce the risk of media leakage.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A pipe connection structure is provided, including a pipe, an outer liner, and an inner liner. The outer wall of the inner liner is connected to the inner wall of the pipe, and the outer liner is connected to the outer wall of the pipe. The outer liners on the two pipes to be connected have outer ends located close to each other, with the outer diameter of the outer end being larger than the outer diameter of the outer liner. The two inner liners have inner ends located close to each other, and the two inner ends are located between the two pipes. The two outer ends are connected to each other, and a first sealing element is provided between the two outer ends. A second sealing element is provided between the outer wall of the inner end and the inner wall of the outer liner.

[0006] The pipe connection structure of this utility model forms a double fixation by connecting the inner liner to the inner wall of the pipe and the outer liner to the outer wall of the pipe. The two outer ends are connected and equipped with a first sealing element, and a second sealing element is provided between the inner end and the inner wall of the outer liner, thus forming a double seal. This effectively prevents media leakage and solves the problem of insufficient sealing performance of traditional connections under high pressure.

[0007] Furthermore, the first sealing element is a sealing strip. The sealing strip has good elasticity and sealing performance, and can closely fit the mating surfaces of the two outer ends. It deforms under pressure to fill the gap, further enhancing the sealing effect of the outer end connection. Compared with other sealing elements, it can better adapt to different gap changes and improve the sealing reliability of the connection structure.

[0008] Furthermore, the second sealing element is a sealing ring. The second sealing element uses a sealing ring, which has the characteristics of simple structure and good sealing performance. It can form an effective sealing barrier between the outer wall of the inner end and the inner wall of the outer liner. Its elastic properties can compensate for the small displacement caused by installation errors and pipeline vibration, ensuring that it can maintain a good sealing state under high pressure. Together with the first sealing element, it forms a double guarantee.

[0009] Furthermore, the outer wall of the liner is provided with multiple electrofusion grooves, each containing a heating wire. The outer wall of the liner abuts against the inner wall of the pipe. The multiple electrofusion grooves with heating wires on the outer wall of the liner, abutting against the inner wall of the pipe, allow the liner and the inner wall of the pipe to be fused together by heating with the heating wires, achieving a tight connection. This not only enhances the connection strength but also effectively prevents media leakage between the liner and the inner wall of the pipe. The design of multiple electrofusion grooves makes the welding more uniform, the connection more robust, and improves the stability of the overall structure.

[0010] Furthermore, the inner wall of the outer liner is provided with multiple crimping teeth, which abut against the outer wall of the pipe. When installing the outer liner, the pipe is inserted into the liner, causing the crimping teeth on the inner wall of the liner to deform and tightly press against the outer wall of the pipe. This significantly enhances the friction and engagement force between the liner and the pipe, preventing relative sliding between them. The tight contact between the crimping teeth and the outer wall of the pipe reduces the gap between the pipe and the liner. Combined with the dual sealing effect of the first and second sealing elements, this further improves the sealing performance of the entire connection structure and reduces the risk of high-pressure medium leakage. The crimping tooth design allows the liner to adapt to pipes with slight deviations in outer diameter. Through the elastic deformation of the crimping teeth, it can better fit the outer wall of the pipe, ensuring a stable connection under various operating conditions and improving the versatility of the connection structure.

[0011] Furthermore, the multiple clamping teeth are arranged at equal intervals. The equally spaced clamping teeth can generate a uniform and continuous clamping force on the pipe. This multi-point uniform force distribution can reduce deformation or damage caused by excessive local stress on the pipe.

[0012] Furthermore, a guide surface is provided on the inner wall of the end of the outer liner furthest from the outer end. The guide surface plays a guiding role during the installation of the outer liner, facilitating the quick and accurate mating of the outer liner with the pipeline, reducing installation difficulty, improving installation efficiency, and minimizing damage to the pipeline and the outer liner during installation.

[0013] Furthermore, the outer ends of the two outer liner components are connected by bolts. This bolted connection provides a large preload, ensuring a tight fit between the two outer ends and guaranteeing a good sealing effect from the first seal. Simultaneously, the high strength of the bolted connection allows it to withstand significant axial forces under high pressure, ensuring the reliability and stability of the outer liner connection.

[0014] Furthermore, the outer liner is a metal structure. Metal materials have the characteristics of high strength and high rigidity, which can effectively resist the pressure of the medium inside the pipeline and the forces of the external environment, improve the compressive strength of the connection structure, and ensure the stability and safety of the connection structure under high pressure.

[0015] Furthermore, the inner liner is made of polyethylene. Polyethylene possesses excellent corrosion resistance, chemical stability, and flexibility, allowing it to fit well against the inner wall of the pipe. Its corrosion resistance prevents the transported medium from eroding the liner, extending its service life, while its flexibility allows it to adapt well to pipe vibration or temperature changes, ensuring sealing performance.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] The pipe connection structure of this utility model includes: 1. Two outer ends connected and equipped with a first sealing element, and a second sealing element between the inner end and the inner wall of the outer liner, forming a double seal to effectively prevent media leakage and solve the problem of insufficient sealing performance of traditional connections under high pressure; 2. Heating with a heating wire allows the inner liner to be fused with the inner wall of the pipe, achieving a tight connection and improving connection strength; 3. When the pipe is inserted into the outer liner, the crimping teeth on the inner wall of the outer liner deform, tightly squeezing the outer wall of the pipe, significantly enhancing the friction and interlocking force between the outer liner and the pipe, preventing relative sliding between the outer liner and the pipe, and improving connection strength; 4. The outer liner is a metal structure, which can effectively resist the pressure of the medium inside the pipe and the forces of the external environment, improving the compressive strength of the connection structure and ensuring the stability and safety of the connection structure under high pressure; 5. The inner liner is made of polyethylene, which is corrosion-resistant and can prevent the transported medium from corroding the liner, extending its service life. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the pipe connection structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the outer liner of the pipe connection structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the inner liner of the pipe connection structure of this utility model;

[0021] Figure 4 for Figure 3 A magnified view of region A in the image.

[0022] In the attached diagram: 1. Pipe; 11. Outer layer; 12. Inner layer; 13. Reinforcing layer; 2. Outer liner; 21. Outer end; 22. First seal; 23. Crimping thread; 24. Guide surface; 25. Bolt; 3. Inner liner; 31. Inner end; 32. Second seal; 33. Heating wire. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. 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.

[0024] 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 patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0025] Example 1

[0026] like Figures 1 to 4 The first embodiment of the pipe connection structure of this utility model is shown, including a pipe 1, an outer liner 2, and an inner liner 3. The outer wall of the inner liner 3 is connected to the inner wall of the pipe 1, and the outer liner 2 is connected to the outer wall of the pipe 1. The outer ends of the outer liners 2 on the two pipes 1 that need to be connected are provided with outer end caps 21 at their close proximity. The outer diameter of the end caps is larger than the outer diameter of the outer liner 2. Figure 2 As shown; the two inner lining pieces 3 are provided with inner end caps 31 at their close ends, and the two inner end caps 31 are located between the two pipes 1, as shown. Figure 3 As shown; the two outer ends 21 are connected to each other, and a first sealing element 22 is provided between the two outer ends 21. A second sealing element 32 is provided between the outer wall of the inner end 31 and the inner wall of the outer liner 2, as shown. Figure 1As shown. In this embodiment, the outer wall of the inner end 31 is provided with a sealing groove for installing the first sealing element 22; one end of the inner end 31 abuts against the end face of the pipe 1, and the other end is flush with the end face of the outer end 21 away from the pipe 1.

[0027] The pipe connection structure of this utility model forms a double fixation by connecting the inner liner 3 to the inner wall of pipe 1 and the outer liner 2 to the outer wall of pipe 1, thereby improving the overall connection strength. The two outer ends 21 are connected and equipped with a first sealing element 22, while a second sealing element 32 is provided between the inner end 31 and the inner wall of the outer liner 2, forming a double seal that effectively prevents media leakage and solves the problem of insufficient sealing performance of traditional connections under high pressure. Simultaneously, the inner end 31 is located between the two pipes 1, and the outer diameter of the outer end 21 is larger than the outer diameter of the outer liner 2. This reasonable structural design facilitates installation and sealing, and can adapt to high-pressure conditions.

[0028] The first sealing element 22 is a sealing strip. The sealing strip has good elasticity and sealing performance, and can closely fit the mating surfaces of the two outer ends 21. It deforms under pressure, fills the gap, and further enhances the sealing effect of the connection part of the outer ends 21. Compared with other sealing elements, it can better adapt to different gap changes and improve the sealing reliability of the connection structure.

[0029] The second sealing element 32 is a sealing ring. The sealing ring is characterized by its simple structure and good sealing performance, forming an effective sealing barrier between the outer wall of the inner end 31 and the inner wall of the outer liner 2. Its elastic properties can compensate for installation errors and minor displacements caused by pipeline vibration, ensuring a good sealing state even under high pressure. Together with the first sealing element 22, it forms a double guarantee.

[0030] In this embodiment, as Figure 1 As shown, pipe 1 includes an outer layer 11, a reinforcing layer 13, and an inner layer 12. The inner wall of the outer layer 11 is connected to the outer wall of the reinforcing layer 13, and the outer wall of the inner layer 12 is connected to the inner wall of the reinforcing layer 13. The three-layer structure of pipe 1, comprising the outer layer 11, reinforcing layer 13, and inner layer 12, enhances the overall performance of pipe 1. The outer layer 11 and inner layer 12 protect the reinforcing layer 13, which significantly improves the strength and pressure resistance of pipe 1, enabling it to withstand high pressure. Furthermore, the outer layer 11 and inner layer 12 can be made of different materials to meet specific requirements such as corrosion resistance, thus improving the applicability of pipe 1. In this embodiment, the inner layer 12 of pipe 1 is generally made of high-density polyethylene or antistatic polyethylene, providing corrosion resistance and chemical resistance. The reinforcing layer 13 is made of glass fiber or aramid fiber wound or woven, giving pipe 1 high strength and pressure resistance, preventing deformation or rupture under high pressure. The outer layer 11 of pipe 1 is a polyethylene protective layer, effectively reducing ultraviolet radiation and mechanical damage.

[0031] The working principle of the pipe connection structure in this embodiment is as follows: the inner liner 3 is inserted into the pipe 1 and connected to the inner wall of the pipe 1. The pipe 1 is inserted into the outer liner 2 and connected to the inner wall of the outer liner 2. A sealing strip is provided between the outer ends 21 installed on the two pipes 1 that need to be connected. A sealing ring is installed in the sealing groove of the inner liner 3 installed in the two pipes 1. The two outer ends 21 are connected. The sealing ring and sealing strip improve the sealing performance, realize double sealing, and prevent corrosive media from corroding the outer liner 2.

[0032] Example 2

[0033] This embodiment is the second embodiment of the pipe connection structure of this utility model. This embodiment is similar to the first embodiment, except that, as Figure 3 or Figure 4 As shown, the outer wall of the liner 3 is provided with multiple electrofusion grooves, each containing a heating wire 33. The outer wall of the liner 3 abuts against the inner wall of the pipe 1. Heating with the heating wires 33 allows the liner 3 to be fused to the inner wall of the pipe 1, achieving a tight connection. This not only enhances the connection strength but also effectively prevents leakage of the medium between the liner 3 and the inner wall of the pipe 1. The design of multiple electrofusion grooves makes the fusion more uniform, the connection more robust, and improves the overall structural stability.

[0034] like Figure 2 As shown, the inner wall of the outer liner 2 is provided with multiple clamping teeth 23, which abut against the outer wall of the pipe 1. When installing the outer liner 2, the pipe 1 is inserted into the outer liner 2. The clamping teeth 23 on the inner wall of the outer liner 2 deform and tightly squeeze the outer wall of the pipe 1, significantly enhancing the friction and interlocking force between the outer liner 2 and the pipe 1, preventing relative sliding between the outer liner 2 and the pipe 1. The tight abutment between the clamping teeth 23 and the outer wall of the pipe 1 reduces the gap between the pipe 1 and the outer liner 2. Combined with the double sealing effect of the first sealing element 22 and the second sealing element 32, the sealing performance of the entire connection structure is further improved, reducing the risk of high-pressure medium leakage. The design of the clamping teeth 23 allows the outer liner 2 to have a certain degree of adaptability to the pipe 1 with slight deviations in outer diameter. Through the elastic deformation of the clamping teeth 23, it can better fit the outer wall of the pipe 1, ensuring a stable connection state under various working conditions and improving the versatility of the connection structure. In this embodiment, the clamping teeth 23 have a triangular structure.

[0035] The multiple clamping teeth 23 are arranged at equal intervals. The equally spaced clamping teeth 23 can form a uniform and continuous clamping force on the pipe 1. This multi-point uniform force can reduce the deformation or damage caused by excessive local force on the pipe 1.

[0036] The inner wall of the end of the outer liner 2 away from the outer end 21 is provided with a guide surface 24. The guide surface 24 can play a guiding role when installing the outer liner 2, so as to facilitate the quick and accurate mating of the outer liner 2 with the pipe 1, reduce the installation difficulty, improve the installation efficiency, and at the same time reduce the damage to the pipe 1 and the outer liner 2 during the installation process.

[0037] The outer ends 21 of the two outer liner parts 2 are connected by bolts 25. The connection of the two outer ends 21 by bolts 25 can provide a large preload, so that the two outer ends 21 fit tightly together, ensuring that the first sealing element 22 performs a good sealing function; at the same time, the bolt connection has high strength and can withstand a large axial force under high pressure environment, ensuring the reliability and stability of the connection of the outer liner parts 2.

[0038] The working principle of the pipe connection structure in this embodiment is as follows: 1. The end of the pipe 1 is processed to clean the impurities and oxide layer on the inner and outer walls of the pipe 1 to ensure that the inner liner 3 and the outer liner 2 can be tightly connected to the pipe 1.

[0039] 2. Insert the inner liner 3 into the inside of the pipe 1, so that the outer wall of the inner liner 3 abuts against the inner wall of the pipe 1, and energize the heating wire 33 to heat it, so that the inner liner 3 and the inner wall of the pipe 1 are fused together.

[0040] 3. Install the second sealing element 32 in the sealing groove on the outer wall of the inner end 31. Under the guidance of the guide surface 24, insert the pipe 1 into the outer liner 2 until the end face of the outer end 21 of the outer liner 2 away from the pipe 1 is flush with the end face of the inner end 31 of the inner liner 3 away from the pipe 1. The inner end 31 and the outer end 21 together squeeze the second sealing element 32 to improve the sealing performance. During the relative sliding process between the pipe 1 and the outer liner 2, the snapping teeth 23 of the outer liner 2 tightly abut against the outer wall of the pipe 1, increasing the friction between the outer liner 2 and the pipe 1 and preventing relative sliding between the outer liner 2 and the pipe 1.

[0041] 4. Place the first sealing element 22 between the two outer ends 21, connect and tighten the two outer ends 21 with bolts 25, so that the first sealing element 22 undergoes elastic deformation and cooperates with the second sealing element 32 to achieve double sealing;

[0042] 5. Install the second sealing element 32 between the outer wall of the inner end 31 and the inner wall of the outer liner 2 to ensure that the second sealing element 32 can fit tightly, thus completing the installation of the entire connection structure.

[0043] Example 3

[0044] This embodiment is the third embodiment of the pipe connection structure of this utility model. This embodiment is similar to embodiment two, except that the outer liner 2 is a metal structure. Metal materials have the characteristics of high strength and high rigidity, which can effectively resist the pressure of the medium inside the pipe 1 and the force of the external environment, improve the compressive strength of the connection structure, and ensure the stability and safety of the connection structure under high pressure.

[0045] The inner liner 3 is made of polyethylene. Polyethylene has excellent corrosion resistance, chemical stability, and flexibility, and can fit well with the inner wall of the pipe 1. Its corrosion resistance can prevent the transported medium from eroding the liner and extend its service life, while its flexibility allows it to adapt well to vibration or temperature changes in the pipe 1, ensuring sealing performance.

[0046] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0047] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A pipe connection structure characterized by comprising: The device includes a pipe (1), an outer liner (2), and an inner liner (3). The outer wall of the inner liner (3) is connected to the inner wall of the pipe (1). The outer liner (2) is connected to the outer wall of the pipe (1). The outer ends of the two pipes (1) that need to be connected are provided with outer ends (21) at their close ends. The outer diameter of the ends is larger than the outer diameter of the outer liner (2). The inner ends (31) are provided with inner ends (31) at their close ends. The two inner ends (31) are located between the two pipes (1). The two outer ends (21) are connected to each other. A first sealing element (22) is provided between the two outer ends (21). A second sealing element (32) is provided between the outer wall of the inner end (31) and the inner wall of the outer liner (2).

2. The pipe connection structure according to claim 1, wherein The first sealing element (22) is a sealing strip.

3. The pipe connection structure according to claim 1, wherein The second sealing element (32) is a sealing ring.

4. The pipe connection structure according to claim 1, wherein The outer wall of the liner (3) is provided with a plurality of electrofusion grooves, and heating wires (33) are installed in the electrofusion grooves. The outer wall of the liner (3) abuts against the inner wall of the pipe (1).

5. The pipe coupling structure according to claim 1, wherein The inner wall of the outer liner (2) is provided with a plurality of snap teeth (23), which abut against the outer wall of the pipe (1).

6. The pipe connection structure according to claim 5, wherein The multiple clamping teeth (23) are arranged at equal intervals.

7. The pipe connection structure according to claim 1, wherein The outer liner (2) has a guide surface (24) on the inner wall of the end away from the outer end (21).

8. The pipe connection structure according to claim 1, wherein The outer ends (21) of the two outer liner pieces (2) are connected by bolts (25).

9. The pipe coupling structure as claimed in claim 1, wherein The outer liner (2) is a metal structure.

10. The pipe connection structure according to claim 1, wherein The inner liner (3) is made of polyethylene.

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