Polytetrafluoroethylene lining pipe with good sealing performance

Abstract

The utility model relates to a polytetrafluoroethylene lining pipe with good sealing performance, which comprises a polytetrafluoroethylene lining pipe body, one end of the polytetrafluoroethylene lining pipe body is provided with an annular sealing groove, and the inner wall of the annular sealing groove is fixedly connected with a second annular sealing block. The same end of the polytetrafluoroethylene lining pipe body is fixedly connected with a first annular sealing block matched with the second annular sealing block, the outer diameter of the first annular sealing block is larger than the inner diameter of the second annular sealing block, and the inner wall of one end of the polytetrafluoroethylene lining pipe body is fixedly connected with a first sealing ring. The outer diameter of one end of the connecting sleeve is larger than the inner diameter of the first sealing ring. By means of the connecting device, the multiple sealing effect can be achieved when the polytetrafluoroethylene lining pipe is connected. And the first sealing ring is tightly matched with the connecting sleeve, and the first annular sealing block is tightly nested with the second annular sealing block, so that the fluid medium is effectively prevented from leaking from the connecting part.

Description

Technical Field

[0001] This utility model relates to the field of pipe connection and sealing technology, and in particular to a polytetrafluoroethylene (PTFE) lined pipe with good sealing performance. Background Technology

[0002] In numerous industrial production and machinery manufacturing scenarios, PTFE-lined pipes have become an ideal choice for fluid transportation pipelines due to their excellent chemical stability, corrosion resistance, and low coefficient of friction. However, in practical applications, the sealing problem at the joints has always been a challenging issue for the industry when multiple PTFE-lined pipes need to be connected and installed.

[0003] Existing PTFE-lined pipe connection methods typically involve simple butt joints or ordinary sealing measures, which are insufficient to meet the sealing requirements under complex operating conditions. This poor sealing can easily lead to leakage of the transported fluid medium. Once leakage occurs, it not only wastes the fluid medium and increases production costs, but may also affect the normal operation of equipment and reduce production efficiency. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing a polytetrafluoroethylene (PTFE) inner liner with good sealing performance. The specific technical solution is as follows:

[0005] The device includes a polytetrafluoroethylene (PTFE) liner tube body. One end of the PTFE liner tube body has an annular sealing groove. A second annular sealing block is fixedly connected to the inner wall of the annular sealing groove. A first annular sealing block adapted to the second annular sealing block is fixedly connected to the same end of the PTFE liner tube body. The outer diameter of the first annular sealing block is larger than the inner diameter of the second annular sealing block. A first sealing ring is fixedly connected to the inner wall of one end of the PTFE liner tube body. A connecting sleeve adapted to the first sealing ring is fixedly connected to the inner wall of the other end of the PTFE liner tube body. The outer diameter of one end of the connecting sleeve is larger than the inner diameter of the first sealing ring.

[0006] Preferably, one end of the first annular sealing block has a boss, and the diameter of the boss is larger than the diameter of the first annular sealing block. The inner end of the annular sealing groove is fixedly connected to an annular limiting sleeve that matches the boss. The annular limiting sleeve can support the boss. When the first annular sealing block and the boss are inserted into the annular sealing groove, the boss is stably engaged in the annular sealing groove.

[0007] Preferably, the inner wall of the end of the second annular sealing block away from the boss is arc-shaped to facilitate the insertion of the boss and the first annular sealing block, and the inner wall of the end of the first sealing ring away from the connecting sleeve is arc-shaped to facilitate the insertion of the connecting sleeve.

[0008] Preferably, the polytetrafluoroethylene (PTFE) inner liner tube body is made of PTFE.

[0009] Preferably, the first annular sealing block and the first annular sealing block are integrally formed.

[0010] The beneficial effects of this utility model are:

[0011] The polytetrafluoroethylene (PTFE) liner of this invention achieves multiple sealing effects during connection. The tight fit between the first sealing ring and the connecting sleeve, as well as the tight nesting of the first annular sealing block and the second annular sealing block, effectively prevent fluid medium from leaking from the connection point.

[0012] The annular limiting sleeve supports and limits the boss, ensuring the stability of the connection structure under external forces such as fluid pressure and vibration, and preventing seal failure due to component displacement. This invention effectively solves the problem of poor sealing at the connection of existing PTFE-lined pipes, improving the safety and stability of equipment operation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 for Figure 1 A magnified structural diagram of point A in the middle.

[0015] Reference numerals in the attached drawings: 1. Polytetrafluoroethylene (PTFE) liner tube body; 100. Annular sealing groove; 2. Connecting sleeve; 3. First sealing ring; 4. First annular sealing block; 5. Second annular sealing block; 6. Annular limiting sleeve. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] Example

[0018] Please refer to Figures 1-2 An annular sealing groove 100 is provided at one end of the polytetrafluoroethylene (PTFE) liner tube body 1. The annular sealing groove 100 is machined at the end of the PTFE liner tube body 1 using precision machining technology. Its depth and width are precisely controlled according to design requirements to ensure the installation and fitting accuracy of subsequent components.

[0019] Specifically, the inner wall of the annular sealing groove 100 is fixedly connected to the second annular sealing block 5 by heat fusion connection. Heat fusion connection involves heating the contact area between the second annular sealing block 5 and the inner wall of the annular sealing groove 100 to the melting point of polytetrafluoroethylene, causing them to fuse together. After cooling, a strong connection is formed. This connection method not only ensures the strength of the connection but also prevents fluid leakage from the connection gap.

[0020] At the same end of the PTFE inner liner tube body 1, a first annular sealing block 4, which is adapted to the second annular sealing block 5, is fixedly connected by a heat fusion connection. The outer diameter of the first annular sealing block 4 is larger than the inner diameter of the second annular sealing block 5. When the two inner liner tubes are connected, the first annular sealing block 4 can be tightly inserted into the inner side of the second annular sealing block 5 to form the first sealing barrier.

[0021] Specifically, a first sealing ring 3 is fixedly connected to the inner wall of one end of the polytetrafluoroethylene (PTFE) liner tube body 1 by an adhesive bonding process. The adhesive used is a special glue with good adhesion properties to both PTFE and the first sealing ring 3, ensuring that the first sealing ring 3 is firmly attached to the inner wall of the liner tube body.

[0022] Specifically, a connecting sleeve 2, which is compatible with the first sealing ring 3, is also fixedly connected to the inner wall of the other end of the polytetrafluoroethylene liner tube body 1 by an adhesive process. The outer diameter of one end of the connecting sleeve 2 is larger than the inner diameter of the first sealing ring 3. When the two liner tubes are connected, the connecting sleeve 2 can be inserted into the first sealing ring 3, so that the first sealing ring 3 tightly wraps around the connecting sleeve 2, forming a second sealing barrier.

[0023] Specifically, one end of the first annular sealing block 4 has a boss with a diameter larger than itself. The boss and the first annular sealing block 4 are integrally formed and manufactured in one step by injection molding, which ensures the integrity and strength of the boss and the first annular sealing block 4.

[0024] Specifically, an annular limiting sleeve adapted to the boss is fixedly connected to the inner end of the annular sealing groove 100 by heat fusion. When the first annular sealing block 4 and the boss are inserted into the annular sealing groove 100, the boss can be stably locked into the annular sealing groove 100, and the annular limiting sleeve supports and limits the boss, preventing the first annular sealing block 4 from axial displacement during use, thereby enhancing the stability of the connection and the reliability of the seal.

[0025] Furthermore, the inner wall of the end of the second annular sealing block 5 furthest from the boss is arc-shaped. This arc-shaped design serves as a guide, facilitating smooth alignment and sliding of the boss and the first annular sealing block 4 into the annular sealing groove 100, reducing resistance and potential jamming during installation.

[0026] Furthermore, the inner wall of the first sealing ring 3 at the end furthest from the connecting sleeve 2 is also curved. This curved design facilitates easier insertion of the connecting sleeve 2 into the first sealing ring 3, improving the convenience and efficiency of installation.

[0027] Before installing the well-sealed PTFE liner, all components must be inspected. Check the PTFE liner body 1 for damage, deformation, or other defects. Verify that the dimensions of the first sealing ring 3, connecting sleeve 2, first annular sealing block 4, second annular sealing block 5, and annular limiting sleeve meet design requirements, and that their surfaces are smooth and free of impurities. Simultaneously, prepare the necessary tools for installation, such as a cleaning cloth, heat fusion equipment (if heat fusion connection is required), and adhesive.

[0028] Align the end with the first annular sealing block 4 and the boss with the annular sealing groove 100 of the other inner liner tube. Since the inner wall of the end of the second annular sealing block 5 furthest from the boss is arc-shaped, the boss can smoothly approach the annular sealing groove 100 along the arc-shaped inner wall during alignment, providing initial guidance and positioning. The operator must ensure that the axes of the two inner liner tubes are basically aligned to avoid deviation during insertion.

[0029] Apply pressure slowly and insert the first annular sealing block 4 and the boss into the annular sealing groove 100. During insertion, carefully observe the fit between the boss and the annular limiting sleeve. Once the boss is fully inserted into the annular sealing groove 100, the annular limiting sleeve tightly wraps around the boss, providing support and limiting, ensuring a tight fit between the first annular sealing block 4 and the second annular sealing block 5, forming the first line of defense for sealing. At this point, the gap between the first annular sealing block 4 and the second annular sealing block 5 should be uniform and meet design requirements to ensure a good sealing effect.

[0030] After the first annular sealing block 4 and the boss are inserted into place, align the connecting sleeve 2 with the first sealing ring 3. Since the inner wall of the first sealing ring 3 at the end furthest from the connecting sleeve 2 is arc-shaped, the connecting sleeve 2 can be smoothly inserted into the first sealing ring 3 under the guidance of the arc-shaped inner wall. During insertion, the insertion speed and force should be appropriately controlled to avoid damage to the first sealing ring 3 or the connecting sleeve 2 due to excessive force. Once the connecting sleeve 2 is fully inserted into the first sealing ring 3, the first sealing ring 3 tightly wraps around the connecting sleeve 2, forming a second line of sealing.

[0031] After installation, inspect the entire connection area. Check that all connections are secure and that there are no loose parts or excessive gaps. The stability of the connection can be checked by gently shaking the inner liner. Also, check the seals for any obvious gaps or signs of leakage. If any problems are found, adjust or reinstall immediately to ensure the seal meets requirements.

[0032] Working principle: In actual use, when a fluid medium flows inside the PTFE-lined tube, the fluid medium will generate a certain pressure on the connection point. The cooperation between the first sealing ring 3 and the connecting sleeve 2, and the cooperation between the first annular sealing block 4 and the second annular sealing block 5, can effectively resist this pressure and prevent the fluid medium from leaking from the connection point.

[0033] Specifically, the first sealing ring 3 tightly wraps around the connecting sleeve 2, using the friction and sealing force generated by its elastic deformation to prevent fluid medium from leaking from the contact interface between the two. The first annular sealing block 4 and the second annular sealing block 5 are tightly nested to form an annular sealing space, further blocking the leakage path of the fluid medium.

[0034] The annular limiting sleeve's support for the boss ensures the stability of the connection structure under external forces such as fluid pressure and vibration, preventing seal failure due to component displacement. This multi-structure collaborative sealing method ensures that the PTFE-lined tube maintains good sealing performance under various operating conditions.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A polytetrafluoroethylene (PTFE) liner with good sealing properties, characterized in that: The device includes a polytetrafluoroethylene (PTFE) liner tube body (1), one end of which is provided with an annular sealing groove (100). A second annular sealing block (5) is fixedly connected to the inner wall of the annular sealing groove (100). A first annular sealing block (4) adapted to the second annular sealing block (5) is fixedly connected to the same end of the PTFE liner tube body (1). The outer diameter of the first annular sealing block (4) is larger than the inner diameter of the second annular sealing block (5). A first sealing ring (3) is fixedly connected to the inner wall of one end of the PTFE liner tube body (1). A connecting sleeve (2) adapted to the first sealing ring (3) is fixedly connected to the inner wall of the other end of the PTFE liner tube body (1). The outer diameter of one end of the connecting sleeve (2) is larger than the inner diameter of the first sealing ring (3).

2. The polytetrafluoroethylene liner with good sealing performance according to claim 1, characterized in that: One end of the first annular sealing block (4) has a boss (41), and the diameter of the boss (41) is larger than the diameter of the first annular sealing block (4). The inner end of the annular sealing groove (100) is fixedly connected to an annular limiting sleeve (6) that is adapted to the boss (41). The annular limiting sleeve (6) can support the boss (41). When the first annular sealing block (4) and the boss (41) are inserted into the annular sealing groove (100), the boss (41) is stably inserted into the annular sealing groove (100).

3. The polytetrafluoroethylene liner with good sealing performance according to claim 2, characterized in that: The inner wall of the second annular sealing block (5) away from the boss (41) is arc-shaped to facilitate the insertion of the boss (41) and the first annular sealing block (4). The inner wall of the first sealing ring (3) away from the connecting sleeve (2) is arc-shaped to facilitate the insertion of the connecting sleeve (2).

4. The polytetrafluoroethylene liner with good sealing performance according to claim 1, characterized in that, The polytetrafluoroethylene (PTFE) inner liner tube body (1) is made of PTFE.

5. The polytetrafluoroethylene liner with good sealing performance according to claim 2, characterized in that, The first annular sealing block (4) and the first annular sealing block (4) are integrally formed.

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