Steel lined teflon pipe compensator

Abstract

This utility model discloses a steel-lined PTFE pipe compensator, including a compensator body. Both ends of the compensator body are provided with connecting pipes, and a second flange is fixed to the end of the connecting pipe facing the compensator body. A sealing ring is embedded in the end face of the second flange. Beneficial effects: By having the extended portions of the PTFE liner at both ends fit against the end face of the first flange of the compensator body, and with two rubber sealing rings interference-fitted onto the surface of the extended portions of the PTFE liner, as the second flange of the connecting pipe extends towards the first flange of the compensator body, the sealing rings on the end face of the second flange are tightly fitted against the extended portions of the PTFE liner of the first flange. Furthermore, the two rubber sealing rings of the extended portions of the PTFE liner extend into two annular sealing grooves opened on the surface of the sealing rings. This connection method achieves both efficient sealing and corrosion resistance at the flange end of the compensator body.

Description

Technical Field

[0001] This utility model relates to the field of PTFE compensators, specifically to a steel-lined PTFE tube compensator. Background Technology

[0002] The steel-lined PTFE compensator has a stainless steel outer body and a PTFE inner lining. It is an industrial instrument used in pipeline systems containing highly corrosive media to compensate for displacement and installation deviations caused by thermal expansion and contraction. It is connected between two pipeline sections to reduce vibration of the pipeline system.

[0003] Currently, when steel-lined PTFE compensators are connected between two pipeline sections, the poor sealing between the PTFE compensator and the pipeline can easily cause leakage of the internal liquid in the pipeline, resulting in waste. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a steel-lined PTFE tube compensator, which has the advantage of preventing leakage at the flange end, thereby solving the problems mentioned in the background technology.

[0006] (II) Technical Solution

[0007] To achieve the aforementioned advantages in preventing flange end leakage, the specific technical solution adopted by this utility model is as follows: A steel-lined PTFE pipe compensator includes a compensator body, with connecting pipes at both ends of the compensator body, and a second flange fixed at the end of the connecting pipe facing the compensator body. A sealing ring is embedded in the end face of the second flange, and two annular sealing grooves are formed on the surface of the sealing ring. A first flange is welded to both ends of the compensator body, and a PTFE inner lining is sintered on the inner wall of the compensator body. Both ends of the PTFE inner lining are provided with extension portions extending to the end face of the first flange, and two rubber sealing rings are interference-fitted to the surface of the extension portions of the PTFE inner lining. The extension portions of the PTFE inner lining are in contact with the sealing ring of the second flange, and the two rubber sealing rings extend into the two annular sealing grooves of the sealing ring, respectively.

[0008] Furthermore, the extended portion of the PTFE liner is arranged in an annular structure, and the outer diameter of the extended portion of the PTFE liner is smaller than the diameter of the first flange. The inner and outer diameters of the sealing ring match the inner and outer diameters of the extended portion of the PTFE liner.

[0009] Furthermore, the diameters of the two rubber sealing rings increase sequentially from the inside out, and the dimensions of the two rubber sealing rings match the dimensions of the two annular sealing grooves.

[0010] Furthermore, the rubber sealing ring has an annular protrusion on the side facing the first flange, and the annular protrusion extends to the inner side of the extended portion of the PTFE liner.

[0011] Furthermore, both the first flange and the second flange have a plurality of screw holes around their surfaces, and the screw holes of the first flange correspond one-to-one with the screw holes of the second flange.

[0012] Furthermore, several extension blocks are welded around the side of the first flange, and fastening bolts are interspersed between the extension blocks of the two second flanges.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, this utility model provides a steel-lined PTFE tube compensator, which has the following beneficial effects:

[0015] This invention features a PTFE liner extending at both ends to fit against the first flange face of the compensator body. Two rubber sealing rings are interference-fitted onto the surface of the PTFE liner extension. As the second flange of the connecting pipe extends toward the first flange of the compensator body, the sealing rings on the second flange face are tightly fitted against the PTFE liner extension of the first flange. Furthermore, the two rubber sealing rings on the PTFE liner extension extend into two annular sealing grooves on the surface of the sealing ring. This connection method achieves both efficient sealing and corrosion resistance at the flange end of the compensator body, which helps extend its service life and prevent liquid leakage. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of a steel-lined PTFE tube compensator according to an embodiment of the present utility model;

[0018] Figure 2 It is a cross-sectional view of the compensator body and the connection status of the connecting pipes;

[0019] Figure 3 This is an end view of the compensator body;

[0020] Figure 4 This is an end view of the connecting pipe.

[0021] In the picture:

[0022] 1. Expansion joint body; 2. Connecting pipe; 3. First flange; 4. Second flange; 5. Extension block; 6. Fastening bolt; 7. Sealing ring; 8. PTFE inner lining; 9. Rubber sealing ring; 10. Annular sealing groove; 11. Bolt hole. Detailed Implementation

[0023] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0024] According to an embodiment of the present invention, a steel-lined PTFE tube compensator is provided.

[0025] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1-4 As shown, a steel-lined PTFE pipe compensator according to an embodiment of the present invention includes a compensator body 1. Both ends of the compensator body 1 are provided with connecting pipes 2, and a second flange 4 is fixed to one end of the connecting pipe 2 facing the compensator body 1. A sealing ring 7 is embedded in the end face of the second flange 4, and two annular sealing grooves 10 are formed on the surface of the sealing ring 7. First flanges 3 are welded to both ends of the compensator body 1. A PTFE inner lining layer 8 is sintered on the inner wall of the compensator body 1, and both ends of the PTFE inner lining layer 8 are provided with extension portions extending to the end face of the first flange 3. Two rubber sealing rings 9 are interference-fitted to the surface of the extension portions of the PTFE inner lining layer 8. The extension portions of the PTFE inner lining layer 8 are in contact with the sealing ring 7 of the second flange 4, and the two rubber sealing rings 9 extend into the two annular sealing grooves 10 of the sealing ring 7. The compensator body 1, as the core component, undertakes the functions of media flow and displacement compensation, and the first flanges 3 welded to its two ends provide a rigid foundation for the connection. The connecting pipe 2 is connected to the compensator body 1 via a fixed second flange 4. The sealing ring 7 embedded in the end face of the second flange 4 is a key component of the sealing system. The two annular sealing grooves 10 on the surface are used to accommodate the rubber sealing rings 9, providing structural support for the seal. The PTFE liner 8 sintered on the inner wall of the compensator body 1 utilizes the excellent chemical stability of PTFE to isolate the medium from the metal body and prevent corrosion. The two ends of the PTFE liner 8 extend to the end face of the first flange 3, and the extended part fits against the sealing ring 7, creating a corrosion-resistant base surface for the seal. The two rubber sealing rings 9, which are interference-fitted to the extended part, are embedded in the annular sealing grooves 10 of the sealing ring 7 when the flange is tightened, and achieve dynamic sealing by filling the gap through elastic deformation.

[0026] Please refer to Figure 2 and Figure 3The extended portion of the PTFE liner 8 has a ring-shaped structure, and its outer diameter is smaller than that of the first flange 3. The inner and outer diameters of the sealing ring 7 match those of the extended portion of the PTFE liner 8. The ring-shaped structure of the extended portion of the PTFE liner 8 conforms to the shape of the flange face, ensuring complete coverage of the flange sealing area and preventing media from contacting the metal. Its outer diameter is smaller than that of the first flange 3. This design allows the bolt pressure to be concentrated on the contact surface between the PTFE liner 8 and the sealing ring 7 when the flange is tightened, preventing seal failure due to pressure dispersion. Simultaneously, the precise matching of the inner and outer diameters of the sealing ring 7 with the extended portion of the PTFE liner 8 ensures a tight fit, eliminating tiny gaps that allow media penetration and further enhancing corrosion resistance and sealing performance.

[0027] Please refer to Figure 2 and Figure 3 The diameters of the two rubber sealing rings 9 increase sequentially from the inside out, and the dimensions of the two rubber sealing rings 9 match the dimensions of the two annular sealing grooves 10. The two rubber sealing rings 9 employ a design where the diameter increases from the inside out, forming a multi-stage sealing system. The inner sealing ring is closer to the direction of media flow, primarily preventing leakage of the main media component, while the outer sealing ring further intercepts trace amounts of media that may bypass the inner sealing ring, providing double protection for the sealing effect. The precise size match between the rubber sealing rings 9 and the annular sealing grooves 10 ensures that after the sealing rings are embedded in the sealing grooves, they can generate sufficient elastic deformation through interference fit, tightly filling the space within the grooves, adapting to pipeline pressure fluctuations and displacement changes, and maintaining good sealing performance under dynamic operating conditions.

[0028] Please refer to Figure 2 and Figure 3 The rubber sealing ring 9 has an annular protrusion on the side facing the first flange 3, extending into the inner side of the extended portion of the PTFE liner 8. This annular protrusion design of the rubber sealing ring 9 towards the first flange 3 is an important reinforcement measure for the sealing system. When the flange is tightened, the annular protrusion is squeezed into the inner side of the extended portion of the PTFE liner 8, forming radial pressure, which acts like "tightening" the sealing interface and effectively prevents the medium from back-permeating along the gap between the PTFE liner 8 and the sealing ring. At the same time, the annular protrusion increases the contact area and friction between the sealing ring and the PTFE liner 8, improving the stability of the sealing ring under dynamic operating conditions and preventing its displacement due to vibration or pressure changes, further enhancing the sealing effect.

[0029] Please refer to Figure 2 and Figure 3Both the first flange 3 and the second flange 4 have a plurality of bolt holes 11 arranged around their surfaces, with each bolt hole 11 on the first flange 3 corresponding one-to-one with the bolt holes 11 on the second flange 4. These corresponding bolt holes 11 on the surfaces of the first flange 3 and the second flange 4 form the basic structure for flange connection. Bolts passing through these bolt holes 11 can tightly connect the two flanges together. During tightening, the evenly distributed bolt design ensures balanced force on the flange surfaces, guaranteeing parallel and close contact of the sealing surfaces and preventing seal failure due to uneven local stress. Furthermore, this detachable connection method facilitates the installation, inspection, and maintenance of the compensator, reducing subsequent operating costs.

[0030] Please refer to Figure 2 and Figure 3 Several extension blocks 5 are welded around the side of the first flange 3, and fastening bolts 6 are interspersed between the extension blocks 5 of the two second flanges 4. The extension blocks 5 welded to the side of the first flange 3 and the fastening bolts 6 form an additional fastening structure. During the operation of the pipeline system, especially when facing conditions such as thermal expansion and contraction and mechanical vibration, the extension blocks 5 and fastening bolts 6 can enhance the tensile and vibration resistance of the flange connection, preventing the flange from loosening or displacing due to external forces. Compared with the flange bolt connection alone, this structure forms a double fastening guarantee, improves the overall structural stability of the compensator, ensures the continuous and reliable operation of the sealing system under complex conditions, reduces the risk of leakage, and extends the service life of the equipment.

[0031] Working Principle: When the PTFE-lined compensator is in operation, the PTFE lining 8 on the inner wall of the compensator body 1 isolates the medium from metal contact, preventing corrosion of the body. Its extended portion fits against the sealing ring 7 on the end face of the second flange 4, forming an initial seal. Simultaneously, two rubber sealing rings 9, which are interference-fitted to the extended portion of the PTFE lining, are pressed into the annular sealing groove 10 of the sealing ring 7 when the flange is tightened. Through elastic deformation, they fill the gap, achieving a dynamic seal. The annular protrusion on the sealing ring also prevents backflow of the medium. In addition, the first and second flanges are tightened by bolts and bolts through bolt holes 11. The fastening bolts 6 between the extension block 5 on the side of the first flange and the second flange enhance structural stability, ensuring that the sealing system does not fail under conditions such as thermal expansion and contraction of the pipeline. Ultimately, this achieves both high-efficiency sealing and corrosion resistance, extending the service life of the compensator and preventing liquid leakage.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] 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, improvements, etc., 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 steel-lined PTFE tube compensator, comprising a compensator body (1), characterized in that, Both ends of the compensator body (1) are provided with connecting pipes (2), and a second flange (4) is fixed at one end of the connecting pipe (2) facing the compensator body (1). A sealing ring (7) is embedded in the end face of the second flange (4), and two annular sealing grooves (10) are opened on the surface of the sealing ring (7). A first flange (3) is welded to both ends of the compensator body (1). A PTFE liner (8) is sintered on the inner wall of the compensator body (1), and both ends of the PTFE liner (8) are provided with an extension portion extending to the end face of the first flange (3). Two rubber sealing rings (9) are interference-connected to the surface of the extension portion of the PTFE liner (8). The extension portion of the PTFE liner (8) is in contact with the sealing ring (7) of the second flange (4), and the two rubber sealing rings (9) extend into the two annular sealing grooves (10) of the sealing ring (7).

2. The PTFE-lined compensator according to claim 1, characterized in that, The extension portion of the PTFE liner (8) is arranged in a ring structure, and the outer diameter of the extension portion of the PTFE liner (8) is smaller than the diameter of the first flange (3). The inner and outer diameters of the sealing ring (7) match the inner and outer diameters of the extension portion of the PTFE liner (8).

3. The PTFE-lined compensator according to claim 1, characterized in that, The diameters of the two rubber sealing rings (9) increase sequentially from the inside to the outside, and the dimensions of the two rubber sealing rings (9) match the dimensions of the two annular sealing grooves (10).

4. A steel-lined PTFE tube compensator according to claim 1, characterized in that, The rubber sealing ring (9) has an annular protrusion on the side facing the first flange (3), and the annular protrusion extends to the inner side of the extension portion of the PTFE liner (8).

5. A steel-lined PTFE tube compensator according to claim 1, characterized in that, The surfaces of the first flange (3) and the second flange (4) are provided with a number of screw holes (11), and the screw holes (11) of the first flange (3) correspond one-to-one with the screw holes (11) of the second flange (4).

6. A steel-lined PTFE tube compensator according to claim 1, characterized in that, The first flange (3) has several extension blocks (5) welded around its side, and fastening bolts (6) are interspersed between the extension blocks (5) of the two second flanges (4).

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