Sealing structure of low-temperature high-pressure safety valve

Abstract

The utility model relates to the technical field of sealing structures, in particular to a low-temperature high-pressure safety valve sealing structure, a movable part is arranged at the top of a bearing part and located in a valve body part, when the pressure of a medium is larger than the downward acting force of the movable part, the movable part moves upwards, a gap is formed between the movable part and the bearing part, and the medium flows out of the gap. When the pressure of the medium is smaller than the downward acting force of the movable part, the movable part is pressed on the bearing part, and the safety valve is closed; the connecting ring completely enters the inclined groove, the bottom of the second sealing body abuts against the bottom of the annular groove, the connecting ring enables the second sealing body to stretch into the first sealing body, the supporting plate pushes the connecting ring to bend inwards and be inserted into the inclined groove, the annular groove is blocked, the sealing performance of the connecting ring and the annular groove is enhanced, and media are prevented from overflowing from the position between the connecting ring and the annular groove. And after the first sealing part and the second sealing part are combined, secondary sealing is provided, and the sealing performance of the safety valve is improved through the combined action of the first sealing part and the second sealing part.

Description

Technical Field

[0001] This utility model relates to the field of sealing structure technology, and in particular to a sealing structure for a low-temperature high-pressure safety valve. Background Technology

[0002] Low-temperature, high-pressure safety valves generally consist of a valve seat, valve disc, and spring. When the pressure of the low-temperature, high-pressure medium in the equipment or pipeline is within the normal range, the spring force keeps the valve disc firmly pressed against the valve seat, keeping the valve closed and preventing the medium from flowing out. When the medium pressure rises above the pressure value set by the spring, the force of the medium acting on the valve disc overcomes the spring force, causing the valve disc to open. The medium is then discharged through the gap between the valve disc and the valve seat, thereby reducing the system pressure. When the system pressure drops to the pressure value at which the spring's restoring force can press the valve disc back onto the valve seat, the valve disc closes, stopping the medium discharge, and the system returns to normal operation.

[0003] Chinese patent application number CN201410599084.5 describes a conical soft-seal structure for a safety valve. This structure seals the safety valve by placing a conical sealing block between the valve disc and the valve seat. When the valve disc presses against the valve seat, the conical sealing block blocks the gap between the valve disc and the valve seat, ensuring the safety valve's tightness. However, this conical sealing block has a T-shaped cross-section, which cannot cover the bottom edge of the valve disc and the top edge of the valve seat, making leakage prone to occur at the junction of the two. Furthermore, since only one sealing block is used, the safety valve loses its protective function when the conical sealing block is damaged. Utility Model Content

[0004] The main purpose of this utility model is to provide a sealing structure for a low-temperature high-pressure safety valve, so as to solve the problem in the related technology that the conical sealing block cannot cover the bottom edge of the valve disc and the top edge of the valve seat, and leakage is likely to occur at the junction of the two.

[0005] To achieve the above objectives, according to one aspect of the present invention, a low-temperature high-pressure safety valve sealing structure is provided, comprising: a valve body portion, wherein the valve body portion provides support and a pressure relief environment for the safety valve;

[0006] The support part is fixedly installed on the bottom surface inside the valve body and is connected to the main pipeline to introduce the medium in the main pipeline into the safety valve.

[0007] The movable part is located on top of the support part and inside the valve body. When the pressure of the medium is greater than the downward force of the movable part, the movable part moves upward, creating a gap between the movable part and the support part, and the safety valve is opened, allowing the medium to flow out through the gap. When the pressure of the medium is less than the downward force of the movable part, the movable part is pressed against the support part, and the safety valve is closed.

[0008] Furthermore, the valve body includes a valve shell, a valve cover, a valve top, and a discharge port. The valve shell has an inner cavity for accommodating a support part and a movable part. The valve cover is fixedly disposed on the top of the valve shell, the valve top is fixedly disposed on the top of the valve cover, and the discharge port is fixedly disposed on the side of the valve shell and communicates with the inner cavity.

[0009] Furthermore, the supporting part includes a support assembly, a feed pipe assembly, and a sealing assembly. The support assembly includes a connecting plate and a base, the feed pipe assembly includes a feed pipe and a feed inlet, and the sealing assembly includes a sealing ring and a first sealing part.

[0010] Furthermore, the connecting plate is fixedly disposed on the outer side of the bottom of the valve body, the feed pipe is fixedly disposed above the connecting plate and extends into the valve body, the feed port is disposed in the feed pipe and is connected to the main pipeline, the medium flows into the safety valve through the feed port, the sealing ring is fixedly disposed on the top of the feed pipe, the bottom support is fixedly disposed on the outer ring of the top of the feed pipe, and the first sealing part is fixedly disposed in the bottom support.

[0011] Furthermore, the first sealing part includes a first sealing body, an annular groove, an inclined groove, and a plurality of push blocks. The first sealing body is fixedly disposed in the base support. The annular groove is disposed above the first sealing body. The inclined groove is disposed below the first sealing body and communicates with the annular groove. The push blocks are fixedly disposed in the base support, and the top of the push blocks extends into the inclined groove.

[0012] Furthermore, the movable part includes a pressure rod assembly, a spring assembly, and a second sealing part. The pressure rod assembly includes a pressure rod, a pressure plate, a top plate, a guide post, and a limiting plate. The spring assembly includes a compression spring and several tension springs.

[0013] Furthermore, the top end of the pressure rod is fixedly connected to the top plate, and the bottom end is fixedly connected to the pressure plate. The guide post is fixedly installed on the top of the top plate. The limiting plate is fixedly connected to the valve cover. The guide post is slidably connected to the limiting plate. The top end of the compression spring is fixedly connected to the valve top, and the bottom end is fixedly connected to the guide post. All tension springs are installed on the outer ring of the pressure plate. The top ends of all tension springs are fixedly connected to the top plate, and the bottom ends are fixedly connected to the bottom surface of the valve body. The second sealing part is fixedly installed at the bottom of the pressure plate.

[0014] Furthermore, the second sealing part includes a second sealing body, a connecting ring, and several support plates. The second sealing body is fixedly connected to the pressure plate, the connecting ring is fixedly disposed at the bottom of the second sealing body, and the support plates are all fixedly disposed outside the connecting ring.

[0015] Compared with the prior art, the present invention has the following beneficial effects: the connecting ring is fully inserted into the inclined groove, the bottom of the second sealing body abuts against the bottom of the annular groove, the connecting ring causes the second sealing body to extend into the first sealing body, the support plate pushes the connecting ring to bend inward and insert it into the inclined groove, sealing the annular groove, strengthening the sealing performance of both, preventing the medium from overflowing from between them, the sealing ring connects the feed pipe and the pressure plate inside, providing the initial seal, and the first sealing part and the second sealing part combine to provide the secondary seal. The two work together to improve the sealing performance of the safety valve. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0017] Figure 2 This is a cross-sectional view of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the first sealing part of this utility model;

[0019] Figure 4 This is a partially enlarged schematic diagram of the first sealing part of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the second sealing part of this utility model;

[0021] Figure 6 This is a schematic diagram showing the positional relationship between the first sealing part and the second sealing part of this utility model.

[0022] Illustration:

[0023] 1. Valve body; 11. Valve shell; 12. Valve cover; 13. Valve top; 14. Discharge port;

[0024] 2. Supporting part; 21. Connecting plate; 22. Feed pipe; 23. Feed port; 24. Sealing ring; 25. Base support; 26. First sealing part; 261. First sealing body; 262. Annular groove; 263. Inclined groove; 264. Push block;

[0025] 3. Moving part; 31. Pressure rod; 32. Pressure plate; 33. Second sealing part; 34. Top plate; 35. Guide column; 36. Limiting plate; 37. Compression spring; 38. Tension spring; 331. Second sealing body; 332. Connecting ring; 333. Support plate. Detailed Implementation

[0026] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0027] Please see Figures 1 to 6This embodiment provides a sealing structure for a low-temperature high-pressure safety valve, including: a valve body 1, which provides support and a pressure relief environment for the safety valve;

[0028] Support part 2 is fixedly installed on the bottom surface inside the valve body part 1 and connected to the main pipeline to introduce the medium in the main pipeline into the safety valve.

[0029] The movable part 3 is located on top of the support part 2 and inside the valve body part 1. When the pressure of the medium is greater than the downward force of the movable part 3, the movable part 3 moves upward, and a gap appears between the movable part 3 and the support part 2. The safety valve is opened, and the medium flows out from the gap. When the pressure of the medium is less than the downward force of the movable part 3, the movable part 3 is pressed on the support part 2, and the safety valve is closed.

[0030] The valve body 1 includes a valve shell 11, a valve cover 12, a valve top 13, and a discharge port 14. The valve shell 11 has an inner cavity for accommodating the support part 2 and the movable part 3. The valve cover 12 is fixedly mounted on the top of the valve shell 11, the valve top 13 is fixedly mounted on the top of the valve cover 12, and the discharge port 14 is fixedly mounted on the side of the valve shell 11 and communicates with the inner cavity.

[0031] The support part 2 includes support groups 21 and 25, feed pipe groups 22 and 23, and sealing groups 24 and 26. Support groups 21 and 25 include a connecting plate 21 and a base 25. Feed pipe groups 22 and 23 include a feed pipe 22 and a feed inlet 23. Sealing groups 24 and 26 include a sealing ring 24 and a first sealing part 26.

[0032] The connecting plate 21 is fixedly installed on the outer side of the bottom of the valve body 11. The feed pipe 22 is fixedly installed above the connecting plate 21 and extends into the valve body 11. The feed port 23 is installed in the feed pipe 22 and is connected to the main pipeline. The medium flows into the safety valve through the feed port 23. The sealing ring 24 is fixedly installed on the top of the feed pipe 22. The bottom support 25 is fixedly installed on the outer ring of the top of the feed pipe 22. The first sealing part 26 is fixedly installed in the bottom support 25.

[0033] The base support 25 has an inverted trapezoidal cross-section, and the first sealing body 261 has a trapezoidal cross-section. The first sealing body 261 is located inside the inverted trapezoid of the base support 25.

[0034] The first sealing part 26 includes a first sealing body 261, an annular groove 262, an inclined groove 263, and a plurality of push blocks 264. The first sealing body 261 is fixedly disposed in the base 25. The annular groove 262 is disposed above the first sealing body 261. The inclined groove 263 is disposed below the first sealing body 261 and communicates with the annular groove 262. The push blocks 264 are fixedly disposed in the base 25, and the top of the push blocks 264 extends into the inclined groove 263.

[0035] The movable part 3 includes pressure rod assemblies 31, 32, 34, 35, 36, spring assemblies 37, 38, and a second sealing part 33. The pressure rod assemblies 31, 32, 34, 35, 36 include a pressure rod 31, a pressure plate 32, a top plate 34, a guide post 35, and a limiting plate 36. The spring assemblies 37 and 38 include a compression spring 37 and several tension springs 38.

[0036] The bottom surface of the pressure plate 32 is provided with an annular groove to accommodate the sealing ring 24.

[0037] The top end of the pressure rod 31 is fixedly connected to the top plate 34, and the bottom end is fixedly connected to the pressure plate 32. The guide post 35 is fixedly installed on the top of the top plate 34. The limiting plate 36 is fixedly connected to the valve cover 12. The guide post 35 is slidably connected to the limiting plate 36. The top end of the compression spring 37 is fixedly connected to the valve top 13, and the bottom end is fixedly connected to the guide post 35. The tension springs 38 are all installed on the outer ring of the pressure plate 32. The top end of the tension springs 38 is fixedly connected to the top plate 34, and the bottom end is fixedly connected to the bottom surface of the valve body 11. The second sealing part 33 is fixedly installed at the bottom of the pressure plate 32.

[0038] The second sealing part 33 includes a second sealing body 331, a connecting ring 332 and several support plates 333. The second sealing body 331 is fixedly connected to the pressure plate 32. The connecting ring 332 is fixedly disposed at the bottom of the second sealing body 331. The support plates 333 are all fixedly disposed outside the connecting ring 332.

[0039] The sealing ring 24, the first sealing body 261, the second sealing body 331, and the connecting ring 332 are all made of polytetrafluoroethylene (PTFE). PTFE has excellent chemical stability and temperature resistance at low temperatures, is corrosion resistant, has an extremely low coefficient of friction, and is soft and easily deformable. When compressed, it can fill gaps and increase sealing. When the push block 264 presses the support plate 333, the support plate 333 pushes the connecting ring 332 inward to bend completely and insert it into the inclined groove 263, sealing the annular groove 262.

[0040] The safety valve is installed on a pipeline carrying a low-temperature, high-pressure medium. When the pressure of the medium in the pipeline is lower than the design value, the compression spring 37 and the tension spring 38 work together to press the pressure plate 32 against the top of the feed pipe 22, blocking the feed port 23 and preventing the medium from overflowing. When the pressure of the medium exceeds the design value, the medium pushes the pressure plate 32 upward. The pressure plate 32 drives the top plate 34 and guide column 35 to move upward through the pressure rod 31. The compression spring 37 is compressed and stored by the guide column 35, and the tension spring 38 is pulled upward and stored by the top plate 34. The sealing ring 24 leaves the groove on the lower surface of the pressure plate 32, and at the same time, the second sealing part 33 leaves the first sealing part 26. A gap appears between the support part 2 and the moving part 3, and the medium enters the inner cavity of the valve body 11 through the gap and is discharged from the discharge port 14 to relieve the pressure of the medium in the pipeline. When the medium pressure drops below the design value, the compression spring 37 extends and pushes the guide column 35 downward. Simultaneously, the tension spring 38 retracts, pulling down the top plate 34 and restoring the pressure plate 32 to the top of the feed pipe 22. The sealing ring 24 is inserted into the groove at the bottom of the pressure plate 32, and the second sealing part 33 is inserted into the first sealing part 26. When the connecting ring 332 enters the inclined groove 263, the push block 264 contacts and pushes the support plate 333, causing the support plate 333 to drive the connecting ring 332 into the inclined groove 263. When the connecting ring 332 is fully inserted into the inclined groove 263, the bottom of the second sealing body 331 abuts against the bottom of the annular groove 262, and the connecting ring 332 causes the second sealing body 331 to extend into the first sealing body 261, strengthening the sealing performance of both and preventing the medium from overflowing between them. The sealing ring 24 connects the feed pipe 22 and the pressure plate 32 internally, providing an initial seal. After the first sealing part 26 and the second sealing part 33 are combined, a secondary seal is provided. The two work together to improve the sealing performance of the safety valve.

[0041] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A sealing structure for a low-temperature, high-pressure safety valve, characterized in that, include: Valve body (1), which provides support and pressure relief environment for the safety valve; Support part (2), the support part (2) is fixedly installed on the bottom surface inside the valve body part (1) and connected to the main pipeline to introduce the medium in the main pipeline into the safety valve; The movable part (3) is located on top of the support part (2) and inside the valve body part (1). When the pressure of the medium is greater than the downward force of the movable part (3), the movable part (3) moves upward, and a gap appears between the movable part (3) and the support part (2). The safety valve is opened, and the medium flows out from the gap. When the pressure of the medium is less than the downward force of the movable part (3), the movable part (3) is pressed on the support part (2), and the safety valve is closed.

2. The sealing structure of the low-temperature high-pressure safety valve according to claim 1, characterized in that, The valve body (1) includes a valve shell (11), a valve cover (12), a valve top (13), and a discharge port (14). The valve shell (11) has an inner cavity for accommodating the support part (2) and the movable part (3). The valve cover (12) is fixedly disposed on the top of the valve shell (11), the valve top (13) is fixedly disposed on the top of the valve cover (12), and the discharge port (14) is fixedly disposed on the side of the valve shell (11) and communicates with the inner cavity.

3. The sealing structure of the low-temperature high-pressure safety valve according to claim 2, characterized in that, The support part (2) includes a support group, a feed pipe group and a sealing group. The support group includes a connecting plate (21) and a base (25). The feed pipe group includes a feed pipe (22) and a feed port (23). The sealing group includes a sealing ring (24) and a first sealing part (26).

4. The sealing structure of the low-temperature high-pressure safety valve according to claim 3, characterized in that, The connecting plate (21) is fixedly installed on the bottom outer side of the valve body (11). The feed pipe (22) is fixedly installed above the connecting plate (21) and extends into the valve body (11). The feed port (23) is installed in the feed pipe (22) and is connected to the main pipeline. The medium flows into the safety valve through the feed port (23). The sealing ring (24) is fixedly installed on the top of the feed pipe (22). The bottom support (25) is fixedly installed on the top outer ring of the feed pipe (22). The first sealing part (26) is fixedly installed in the bottom support (25).

5. The sealing structure of the low-temperature high-pressure safety valve according to claim 3, characterized in that, The first sealing part (26) includes a first sealing body (261), an annular groove (262), an inclined groove (263) and a plurality of push blocks (264). The first sealing body (261) is fixedly disposed in the base (25). The annular groove (262) is disposed above the first sealing body (261). The inclined groove (263) is disposed below the first sealing body (261) and communicates with the annular groove (262). The push blocks (264) are fixedly disposed in the base (25). The top of the push blocks (264) extends into the inclined groove (263).

6. The sealing structure of the low-temperature high-pressure safety valve according to claim 3, characterized in that, The movable part (3) includes a pressure rod assembly, a spring assembly, and a second sealing part (33). The pressure rod assembly includes a pressure rod (31), a pressure plate (32), a top plate (34), a guide post (35), and a limiting plate (36). The spring assembly includes a compression spring (37) and several tension springs (38).

7. The sealing structure of the low-temperature high-pressure safety valve according to claim 6, characterized in that, The top end of the pressure rod (31) is fixedly connected to the top plate (34), and the bottom end is fixedly connected to the pressure plate (32). The guide post (35) is fixedly installed on the top of the top plate (34). The limiting plate (36) is fixedly connected to the valve cover (12). The guide post (35) is slidably connected to the limiting plate (36). The top end of the compression spring (37) is fixedly connected to the valve top (13), and the bottom end is fixedly connected to the guide post (35). The tension springs (38) are all installed on the outer ring of the pressure plate (32). The top end of the tension springs (38) is fixedly connected to the top plate (34), and the bottom end is fixedly connected to the bottom surface of the valve shell (11). The second sealing part (33) is fixedly installed at the bottom of the pressure plate (32).

8. The sealing structure of the low-temperature high-pressure safety valve according to claim 6, characterized in that, The second sealing part (33) includes a second sealing body (331), a connecting ring (332) and several support plates (333). The second sealing body (331) is fixedly connected to the pressure plate (32). The connecting ring (332) is fixedly disposed at the bottom of the second sealing body (331). The support plates (333) are all fixedly disposed outside the connecting ring (332).

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