High-pressure-resistant and corrosion-resistant stainless steel metal expansion joint

Abstract

The utility model discloses a high-pressure-resistant and corrosion-resistant stainless steel metal expansion joint which comprises a corrugated pipe, end pipes are fixedly installed at the upper end and the lower end of the corrugated pipe, supports are fixedly installed outside the end pipes, flanges are fixedly installed outside the end pipes, guide pipes are installed inside the flanges, and the guide pipes are connected with the corrugated pipe. A movable cavity is formed in the flange, a supporting spring is fixedly installed in the movable cavity, and an annular movable seat is fixedly installed at the outer end of the supporting spring. The movable cavity, the supporting spring, the annular movable seat, the sealing gasket and the sealing ring are arranged in the flange, when the expansion joint is subjected to high pressure, the pressure acts on the guide pipe, the guide pipe extrudes the annular movable seat, the annular movable seat compresses the supporting spring in the movable cavity, the sealing gasket and the sealing ring are tightly attached, the sealing effect is enhanced, and the service life of the expansion joint is prolonged. Medium leakage is effectively prevented, and the sealing performance and the pressure bearing capacity of the expansion joint in the high-pressure environment are improved.

Description

Technical Field

[0001] This utility model relates to the field of metal expansion joint technology, specifically a high-pressure resistant and corrosion-resistant stainless steel metal expansion joint. Background Technology

[0002] Metal expansion joints are important components in pipeline systems used to compensate for deformation caused by thermal expansion and contraction, mechanical displacement, etc., and to absorb vibration and reduce noise. They are widely used in many fields such as petroleum, chemical, and power. In actual use, pipeline systems often face harsh conditions such as high pressure and strong corrosion. Existing stainless steel metal expansion joints have certain shortcomings in terms of high pressure resistance and corrosion resistance. Under high pressure, the sealing structure of traditional expansion joints is prone to failure, leading to media leakage. On the other hand, when exposed to corrosive media for a long time, the metal components of the expansion joint are easily corroded, shortening their service life and affecting the safe and stable operation of the pipeline system. Utility Model Content

[0003] The purpose of this invention is to provide a high-pressure resistant and corrosion-resistant stainless steel metal expansion joint, which has the advantages of high pressure resistance and corrosion resistance.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a high-pressure resistant and corrosion-resistant stainless steel metal expansion joint, comprising a bellows, with end pipes fixedly installed at both the upper and lower ends of the bellows, a bracket fixedly installed on the outside of the end pipes, a flange fixedly installed on the outside of the end pipes, a guide tube installed inside the flange, a movable cavity opened inside the flange, a support spring fixedly installed inside the movable cavity, an annular movable seat fixedly installed at the outer end of the support spring, a sealing gasket fixedly installed on the outside of the annular movable seat, a sealing ring installed at the bottom of the outer end of the sealing gasket, and the inner end of the sealing ring connected to the surface of the flange.

[0005] As a preferred embodiment, the outer surface coating of the end tube consists of a polytetrafluoroethylene (PTFE) isolation layer, a high-temperature and corrosion-resistant coating, an anti-corrosion coating, and a reinforcing layer. The inner surface of the PTFE isolation layer is coated with a high-temperature and corrosion-resistant coating, the inner surface of the high-temperature and corrosion-resistant coating is coated with an anti-corrosion coating, and the inner surface of the anti-corrosion coating is coated with a reinforcing layer.

[0006] As a preferred embodiment, the annular movable seat has one end inside the movable cavity in sliding contact with the inside of the movable cavity, and the inner wall of the sealing gasket end is in contact with the outer end of the sealing ring.

[0007] As a preferred embodiment, the thickness of the polytetrafluoroethylene isolation layer is 0.2 micrometers, the high-temperature and corrosion-resistant coating is a ceramic coating, the anti-corrosion coating is an epoxy resin coating, and the reinforcing layer is made of glass fiber reinforced resin.

[0008] As a preferred embodiment, the contact surface between the annular movable seat and the movable cavity is provided with a wear-resistant coating, and the sealing gasket is made of silicone rubber.

[0009] As a preferred embodiment, the bracket and the end tube are fixedly connected by welding, and the bracket is evenly distributed along the circumference of the end tube.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] 1. This utility model, through the structure of setting a movable cavity, a support spring, an annular movable seat, a sealing gasket, and a sealing ring inside the flange, when the expansion joint is subjected to high pressure, the pressure acts on the guide tube, the guide tube squeezes the annular movable seat, and the annular movable seat compresses the support spring in the movable cavity, so that the sealing gasket and the sealing ring fit tightly together, enhancing the sealing effect, effectively preventing media leakage, and improving the sealing performance and pressure bearing capacity of the expansion joint under high pressure environment.

[0012] 2. This utility model addresses the issue that the annular movable seat needs to slide frequently within the movable cavity to cope with pressure changes and pipeline displacement. The resulting friction can lead to component wear. By applying a wear-resistant coating, the coefficient of friction between the annular movable seat and the movable cavity can be significantly reduced, thus reducing wear, extending the service life of the annular movable seat, ensuring its long-term stable sliding within the movable cavity, maintaining the effectiveness of the sealing structure, and ensuring that the expansion joint continues to perform well in sealing and pressure-bearing performance under high-pressure environments. This also reduces maintenance costs and replacement frequency caused by component wear. Attached Figure Description

[0013] Figure 1 This is a three-dimensional view of the structure of this utility model;

[0014] Figure 2 This is a partial structural cross-sectional view of the present invention;

[0015] Figure 3 This utility model Figure 2 A magnified view of a section at point A in the middle;

[0016] Figure 4 This is a schematic diagram of the external structure of the end tube of this utility model.

[0017] In the diagram: 1. Corrugated pipe; 2. End pipe; 3. Support; 4. Flange; 5. Conduit; 6. Movable cavity; 7. Support spring; 8. Annular movable seat; 9. Sealing gasket; 10. Sealing ring; 11. PTFE isolation layer; 12. High temperature and corrosion resistant coating; 13. Anti-corrosion coating; 14. Reinforcing layer. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0020] Example 1:

[0021] Please see Figure 1 As shown, this utility model provides a high-pressure resistant and corrosion-resistant stainless steel metal expansion joint, including a bellows 1, with end pipes 2 fixedly installed at both the upper and lower ends of the bellows 1, a bracket 3 fixedly installed on the outside of the end pipe 2, a flange 4 fixedly installed on the outside of the end pipe 2, a conduit 5 installed inside the flange 4, a movable cavity 6 opened inside the flange 4, a support spring 7 fixedly installed inside the movable cavity 6, an annular movable seat 8 fixedly installed at the outer end of the support spring 7, a sealing gasket 9 fixedly installed on the outside of the annular movable seat 8, a sealing ring 10 installed at the bottom of the outer end of the sealing gasket 9, and the inner end of the sealing ring 10 connected to the surface of the flange 4.

[0022] This technical solution, through the structure of a movable cavity 6, a support spring 7, an annular movable seat 8, a sealing gasket 9, and a sealing ring 10 inside the flange 4, allows the expansion joint to be subjected to high pressure. When the expansion joint is subjected to high pressure, the pressure acts on the guide tube 5, and the guide tube 5 squeezes the annular movable seat 8. The annular movable seat 8 compresses the support spring 7 within the movable cavity 6, making the sealing gasket 9 and the sealing ring 10 fit tightly together, enhancing the sealing effect, effectively preventing media leakage, and improving the sealing performance and pressure bearing capacity of the expansion joint under high pressure environment.

[0023] Example 2:

[0024] Based on Embodiment 1, this utility model is as follows: Figure 4 As shown, the outer surface coating of the end tube 2 is composed of a polytetrafluoroethylene isolation layer 11, a high-temperature and corrosion-resistant coating 12, an anti-corrosion coating 13, and a reinforcing layer 14. The inner surface of the polytetrafluoroethylene isolation layer 11 is coated with a high-temperature and corrosion-resistant coating 12, the inner surface of the high-temperature and corrosion-resistant coating 12 is coated with an anti-corrosion coating 13, and the inner surface of the anti-corrosion coating 13 is coated with a reinforcing layer 14.

[0025] Adopting such Figure 1The technical solution shown features a rationally designed coating structure on the outer surface of the end tube 2. The polytetrafluoroethylene (PTFE) isolation layer 11 possesses excellent chemical stability and non-stick properties, effectively isolating corrosive media from contact with the end tube metal. The high-temperature and corrosion-resistant coating 12 is a ceramic coating, characterized by high temperature resistance, high hardness, and good chemical stability, further resisting high temperatures and corrosion. The anti-corrosion coating 13 is an epoxy resin coating, exhibiting good corrosion resistance to various chemical substances. The reinforcing layer 14 is made of glass fiber reinforced resin, enhancing the overall strength and toughness of the coating, thereby giving the end tube 2 excellent corrosion resistance and extending the service life of the expansion joint.

[0026] Secondly, in the technical solution, the end of the annular movable seat 8 located inside the movable cavity 6 slides in contact with the inside of the movable cavity 6, the inner wall of the end of the sealing gasket 9 fits against the outer end of the sealing ring 10; the thickness of the polytetrafluoroethylene isolation layer 11 is 0.2 micrometers, the high temperature and corrosion resistant coating 12 is a ceramic coating, the anti-corrosion coating 13 is an epoxy resin coating, and the reinforcing layer 14 is made of glass fiber reinforced resin.

[0027] Its adoption is as follows Figure 1 The technical solution shown features a design where the annular movable seat 8 slides within the movable cavity 6, allowing it to move flexibly when pressure changes. It works in conjunction with the sealing gasket 9 and the sealing ring 10. When the pressure inside the pipeline changes, the annular movable seat 8 can slide within the movable cavity 6, causing the inner wall of the end of the sealing gasket 9 to fit tightly against the outer end of the sealing ring 10. This dynamic sealing fit can effectively cope with different pressure conditions, enhance the reliability of the sealing structure, ensure that the medium will not leak under high pressure, and improve the sealing performance and pressure bearing capacity of the expansion joint.

[0028] Example 3:

[0029] This utility model is as follows Figures 1-4 As shown, the contact surface between the annular movable seat 8 and the movable cavity 6 is provided with a wear-resistant coating, and the sealing gasket 9 is made of silicone rubber; the bracket 3 and the end tube 2 are fixedly connected by welding, and the bracket 3 is evenly distributed along the circumference of the end tube 2.

[0030] Using the above technical solution, when the expansion joint is working, the annular movable seat 8 needs to slide frequently within the movable cavity 6 to cope with pressure changes and pipeline displacement. The resulting friction will cause component wear. By setting a wear-resistant coating, the coefficient of friction between the annular movable seat 8 and the movable cavity 6 can be significantly reduced, the degree of wear can be reduced, the service life of the annular movable seat 8 can be extended, and its long-term stable sliding within the movable cavity 6 can be ensured. This maintains the effectiveness of the sealing structure, ensures that the expansion joint continues to perform good sealing and pressure-bearing performance under high pressure environment, and reduces maintenance costs and replacement frequency caused by component wear.

[0031] The working principle of this utility model is as follows: When the pressure of the medium in the pipeline system increases, the pressure is transmitted to the conduit 5. The conduit 5 pushes the annular movable seat 8, and the annular movable seat 8 compresses the support spring 7, making the sealing gasket 9 and the sealing ring 10 fit more tightly, enhancing the sealing effect and preventing medium leakage. At the same time, the polytetrafluoroethylene isolation layer 11 has excellent chemical stability and non-stick properties, which can effectively isolate the contact between corrosive media and the end pipe metal. The high-temperature and corrosion-resistant coating 12 is a ceramic coating, which has the characteristics of high temperature resistance, high hardness, and good chemical stability, and can further resist high temperature and corrosion. The anti-corrosion coating 13 is an epoxy resin coating, which has good corrosion resistance to a variety of chemical substances. The reinforcing layer 14 is made of glass fiber reinforced resin, which enhances the overall strength and toughness of the coating, thereby giving the end pipe 2 good corrosion resistance and extending the service life of the expansion joint.

[0032] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0033] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A high-pressure resistant and corrosion-resistant stainless steel metal expansion joint, comprising a bellows (1), characterized in that: Both ends of the corrugated pipe (1) are fixedly installed with end pipes (2). A bracket (3) is fixedly installed on the outside of the end pipe (2). A flange (4) is fixedly installed on the outside of the end pipe (2). A conduit (5) is installed inside the flange (4). A movable cavity (6) is opened inside the flange (4). A support spring (7) is fixedly installed inside the movable cavity (6). An annular movable seat (8) is fixedly installed on the outer end of the support spring (7). A sealing gasket (9) is fixedly installed on the outside of the annular movable seat (8). A sealing ring (10) is installed at the bottom of the outer end of the sealing gasket (9). The inner end of the sealing ring (10) is connected to the surface of the flange (4).

2. The high-pressure resistant and corrosion-resistant stainless steel metal expansion joint according to claim 1, characterized in that: The outer surface coating of the end tube (2) consists of a polytetrafluoroethylene isolation layer (11), a high temperature and corrosion resistant coating (12), an anti-corrosion coating (13), and a reinforcing layer (14). The inner surface of the polytetrafluoroethylene isolation layer (11) is coated with a high temperature and corrosion resistant coating (12), the inner surface of the high temperature and corrosion resistant coating (12) is coated with an anti-corrosion coating (13), and the inner surface of the anti-corrosion coating (13) is coated with a reinforcing layer (14).

3. The high-pressure resistant and corrosion-resistant stainless steel metal expansion joint according to claim 1, characterized in that: The annular movable seat (8) is located inside the movable cavity (6) at one end and slides in contact with the inside of the movable cavity (6), and the inner wall of the end of the sealing gasket (9) is in contact with the outer end of the sealing ring (10).

4. The high-pressure resistant and corrosion-resistant stainless steel metal expansion joint according to claim 2, characterized in that: The polytetrafluoroethylene isolation layer (11) has a thickness of 0.2 micrometers, the high temperature and corrosion resistant coating (12) is a ceramic coating, the anti-corrosion coating (13) is an epoxy resin coating, and the reinforcing layer (14) is made of glass fiber reinforced resin.

5. The high-pressure resistant and corrosion-resistant stainless steel metal expansion joint according to claim 1, characterized in that: The contact surface between the annular movable seat (8) and the movable cavity (6) is provided with a wear-resistant coating, and the sealing gasket (9) is made of silicone rubber.

6. The high-pressure resistant and corrosion-resistant stainless steel metal expansion joint according to claim 1, characterized in that: The bracket (3) is fixedly connected to the end tube (2) by welding, and the bracket (3) is evenly distributed along the circumference of the end tube (2).

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