A cryogenic valve with a pressure relief structure

Abstract

The utility model belongs to the technical field of cryogenic valves, and is particularly a cryogenic valve with a pressure relief structure, including a valve body. The utility model allows high-pressure gas in the valve body to enter the pressure relief pipe and push the piston plate downward, the piston plate slides downward in the pressure relief pipe and compresses the spring, and as the piston plate moves downward so as to gradually exceed the pressure relief hole, the pressure relief hole exposes the high-pressure gas to be released through the pressure relief hole, the knob is turned to drive the adjusting rod to move through the screw rod, the adjusting rod drives the supporting plate to move through the hinge rod, the supporting plate compresses the spring, so that the initial state of the spring is in various degrees of compression state, the damping elastic force of the spring in the compressed state on the piston plate is obviously increased, the compression degree of the spring can be adjusted according to the needs, so as to adjust the different damping elastic forces on the piston plate and adjust the pressure value of the pressure relief, and the spring with elastic fatigue after long-term use can be corrected to extend the service life, so as to achieve the purpose of stable and long-life safe pressure relief.

Description

Technical Field

[0001] The utility model relates to the technical field of cryogenic valves, in particular to a cryogenic valve with a pressure relief structure. Background Art

[0002] Cryogenic valves include cryogenic ball valves, cryogenic gate valves, cryogenic stop valves, cryogenic safety valves, cryogenic check valves, cryogenic butterfly valves, cryogenic needle valves, cryogenic throttle valves, cryogenic pressure reducing valves, etc. They are mainly used in ethylene and liquefied natural gas devices. The output liquid cryogenic media such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, etc. are not only flammable and explosive, but also gasify when heated. When gasified, the volume expands hundreds of times. The application of cryogenic valves controls the temperature and prevents hidden dangers such as explosion and leakage.

[0003] China's publicly authorized invention: CN209557771U discloses a cryogenic valve with a pressure relief function, including a cryogenic valve, wherein the two ends of the cryogenic valve are respectively provided with a water inlet end and a water outlet end, a mounting tube is inserted on the outer wall of the cryogenic valve close to the water inlet end, and the mounting tube and the water inlet end are interconnected, a pressure relief device is arranged in the mounting tube, and a waste collection device is connected to the end of the mounting tube away from the cryogenic valve. In the utility model, a pressure relief device is arranged at the water inlet end of the cryogenic valve. When the pressure at the cryogenic valve rises sharply, the pressure will push the sealing plate to move to the side away from the cryogenic valve, which can drive the medium to be discharged from the mounting tube, thereby having a pressure relief effect on the cryogenic valve and preventing the cryogenic valve from being damaged due to excessive pressure;

[0004] However, there are still some problems with the device. In actual use, it is not convenient to adjust the pressure of the pressure relief according to needs, and the spring-type pressure relief valve cannot be adjusted when the elastic force weakens due to elastic fatigue after long-term use, resulting in a significant reduction and lack of rebound sensitivity and damping force. Therefore, we propose a low-temperature valve with a pressure relief structure to solve the above problems. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies of the prior art, the utility model provides a low-temperature valve with a pressure relief structure, which solves the problems raised in the above-mentioned background technology.

[0007] (II) Technical solution

[0008] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0009] A low-temperature valve with a pressure relief structure comprises a valve body, the bottom of the valve body is connected to and fixed with a pressure relief pipe, the pressure relief pipe is provided with a plurality of pressure relief holes in a ring shape, a limit ring is fixedly connected to the inner wall of the pressure relief pipe, two limit rods are welded to the bottom of the limit ring, a piston plate is slidably connected to the limit rod, a support plate is provided in the pressure relief pipe, a plurality of springs are fixedly connected between the top of the support plate and the bottom of the piston plate, a screw rod is rotatably connected to one side of the pressure relief pipe, the end of the screw rod extends into the pressure relief pipe and is threadedly connected to an adjusting rod, the top of the adjusting rod is rotatably connected to an inclined hinge rod, the end of the hinge rod is hinged to the bottom of the support plate, and a knob is welded to the other end of the screw rod.

[0010] Furthermore, a round block is fixedly connected to the bottom of the pressure relief pipe, and two positioning rods are fixedly connected to the top of the round block.

[0011] Furthermore, a connecting rod is slidably connected to the positioning rod, and the top end of the connecting rod is fixedly connected to the bottom end of the supporting plate.

[0012] Furthermore, a limiting groove is provided on the top of the round block, a limiting block is slidably connected to the limiting groove, and the top of the limiting block is fixedly connected to the bottom of the adjusting rod.

[0013] Furthermore, flanges are fixedly connected to both sides of the valve body.

[0014] Furthermore, a mounting hole is opened on the inner wall of one side of the pressure relief pipe, a bearing is fixedly connected to the inner wall of the mounting hole, and the inner side of the inner ring of the bearing is welded to the outer side of the screw rod.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the utility model provides a low-temperature valve with a pressure relief structure, which has the following beneficial effects:

[0017] The utility model allows high-pressure gas in the valve body to enter the pressure relief pipe and push the piston plate downward. The piston plate slides downward in the pressure relief pipe and compresses the spring. As the piston plate moves downward and gradually exceeds the pressure relief hole, the pressure relief hole is exposed, and the high-pressure gas is discharged through the pressure relief hole. When adjusting, the knob is turned to drive the adjusting rod to move through the screw rod, and the adjusting rod drives the supporting plate to move upward through the hinge rod. The supporting plate compresses the spring, so that the initial state of the spring is in a state of compression to various degrees. The damping elastic force of the spring in the compressed state on the piston plate is obviously increased, and the compression degree of the spring can be adjusted according to needs to achieve different damping elastic forces on the piston plate, thereby achieving the pressure value of adjusting the pressure relief. In this way, the spring that has been elastically fatigued for a long time can be corrected, the service life can be extended, and the purpose of stable, long-life and safe pressure relief can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the cutaway three-dimensional structure of the pressure relief pipe of the utility model;

[0020] Figure 3 For this utility model Figure 3 Schematic diagram of the inclined three-dimensional structure after the middle circle is hidden;

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the utility model after the piston plate moves.

[0022] In the figure: 1. valve body; 2. pressure relief pipe; 3. pressure relief hole; 4. limit ring; 5. limit rod; 6. piston plate; 7. support plate; 8. spring; 9. screw rod; 10. adjusting rod; 11. hinge rod; 12. knob; 13. positioning rod; 14. connecting rod; 15. limit block; 16. limit groove; 17. flange; 18. round block. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0024] like Figure 1-4As shown, a low-temperature valve with a pressure relief structure proposed in an embodiment of the utility model includes a valve body 1, the bottom of the valve body 1 is connected and fixed with a pressure relief pipe 2, the pressure relief pipe 2 is provided with a plurality of pressure relief holes 3 in a ring shape, a limit ring 4 is fixedly connected to the inner wall of the pressure relief pipe 2, two limit rods 5 are welded to the bottom of the limit ring 4, a piston plate 6 is slidably connected to the limit rod 5, a support plate 7 is provided in the pressure relief pipe 2, a plurality of springs 8 are fixedly connected between the top of the support plate 7 and the bottom of the piston plate 6, a screw rod 9 is rotatably connected to one side of the pressure relief pipe 2, the end of the screw rod 9 extends into the pressure relief pipe 2 and is threadedly connected with an adjusting rod 10, the top of the adjusting rod 10 is rotatably connected with an inclined hinge rod 11, the end of the hinge rod 11 is hinged to the bottom of the support plate 7, a knob 12 is welded to the other end of the screw rod 9, and the high-pressure gas in the valve body 1 enters the pressure relief pipe 2 and pushes the piston plate 6 downward, the piston plate 6 slides downward in the pressure relief pipe 2 and compresses the spring 8. As the piston plate 6 moves downward and gradually exceeds the pressure relief hole 3, the pressure relief hole 3 is exposed, and the high-pressure gas is discharged through the pressure relief hole 3. When adjusting, the knob 12 is turned to drive the adjusting rod 10 to move through the screw rod 9, and the adjusting rod 10 drives the supporting plate 7 to move upward through the hinge rod 11. The supporting plate 7 compresses the spring 8, so that the initial state of the spring 8 is in various degrees of compression. The damping elastic force of the spring 8 in the compressed state on the piston plate 6 is obviously increased, and the compression degree of the spring 8 can be adjusted according to the needs to achieve different damping elastic forces on the piston plate 6, thereby achieving the pressure value of adjusting the pressure relief. In this way, the spring 8 that has been elastically fatigued for a long time can be corrected, the service life can be extended, and the purpose of stable, long-life and safe pressure relief can be achieved.

[0025] In some embodiments, a round block 18 is fixedly connected to the bottom of the pressure relief pipe 2, two positioning rods 13 are fixedly connected to the top of the round block 18, a connecting rod 14 is slidably connected to the positioning rod 13, and the top of the connecting rod 14 is fixedly connected to the bottom of the support plate 7. The setting of the connecting rod 14 plays a limiting role.

[0026] In some embodiments, a limiting groove 16 is opened at the top of the round block 18, and a limiting block 15 is slidably connected to the limiting groove 16. The top of the limiting block 15 is fixedly connected to the bottom of the adjusting rod 10. The setting of the limiting block 15 plays a limiting role.

[0027] In some embodiments, flanges 17 are fixedly connected to both sides of the valve body 1 , and the provision of the flanges 17 facilitates the fixing of the valve body 1 .

[0028] In some embodiments, a mounting hole is opened on the inner wall of one side of the pressure relief pipe 2, and a bearing is fixedly connected to the inner wall of the mounting hole. The inner side of the inner ring of the bearing is welded to the outer side of the screw rod 9. Through welding, the bearing and the screw rod 9 are fixed more securely.

[0029] Working principle or structural principle, when in use, when releasing pressure, the high-pressure gas in the valve body 1 enters the pressure relief pipe 2 and pushes the piston plate 6 downward. Under the pushing force, the piston plate 6 slides downward in the pressure relief pipe 2 and compresses the spring 8. As the piston plate 6 moves downward and gradually exceeds the pressure relief hole 3, the pressure relief hole 3 is exposed, and the high-pressure gas is released through the pressure relief hole 3. When the elastic fatigue force of the spring 8 weakens due to long-term use, or when it is necessary to adjust the damping force of the spring 8 on the piston plate 6 to achieve the adjusted pressure relief value, turn the knob 12, the knob 12 drives the adjusting rod 10 to move through the screw rod 9, and the adjusting rod 10 drives the limit block 15 to slide on the limit groove 16, and the adjusting rod 10 During the movement, the hinged rod 11 is squeezed. Under the action of the squeezing force, the hinged rod 11 drives the support plate 7 to move upward, and the support plate 7 drives the connecting rod 14 to slide on the positioning rod 13. The support plate 7 compresses the spring 8, so that the spring 8 is initially in a state of compression to various degrees. The damping elastic force of the spring 8 in the compressed state on the piston plate 6 is obviously increased, and the compression degree of the spring 8 can be adjusted as needed to achieve different damping elastic forces on the piston plate 6, thereby achieving the pressure value of the pressure relief. In this way, the spring 8 that has been elastically fatigued for a long time can be corrected, thereby extending its service life and achieving the purpose of stable, long-life and safe pressure relief.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A cryogenic valve with a pressure relief structure, comprising a valve body (1), characterized in that: The bottom of the valve body (1) is connected to and fixed with a pressure relief pipe (2), the pressure relief pipe (2) is provided with a plurality of pressure relief holes (3) in an annular shape, a limit ring (4) is fixedly connected to the inner wall of the pressure relief pipe (2), two limit rods (5) are welded to the bottom of the limit ring (4), a piston plate (6) is slidably connected to the limit rod (5), a support plate (7) is provided in the pressure relief pipe (2), a plurality of springs (8) are fixedly connected between the top of the support plate (7) and the bottom of the piston plate (6), a screw rod (9) is rotatably connected to one side of the pressure relief pipe (2), the end of the screw rod (9) extends into the pressure relief pipe (2) and is threadedly connected to an adjusting rod (10), the top of the adjusting rod (10) is rotatably connected to an inclined hinge rod (11), the end of the hinge rod (11) is hinged to the bottom of the support plate (7), and a knob (12) is welded to the other end of the screw rod (9).

2. A cryogenic valve with a pressure relief structure according to claim 1, characterized in that: A round block (18) is fixedly connected to the bottom of the pressure relief pipe (2), and two positioning rods (13) are fixedly connected to the top of the round block (18).

3. A cryogenic valve with a pressure relief structure according to claim 2, characterized in that: A connecting rod (14) is slidably connected to the positioning rod (13), and the top end of the connecting rod (14) is fixedly connected to the bottom end of the support plate (7).

4. The cryogenic valve with a pressure relief structure according to claim 2, characterized in that: A limiting groove (16) is provided on the top of the round block (18), a limiting block (15) is slidably connected to the limiting groove (16), and the top of the limiting block (15) is fixedly connected to the bottom of the adjusting rod (10).

5. The cryogenic valve with a pressure relief structure according to claim 1, characterized in that: Flange plates (17) are fixedly connected to both sides of the valve body (1).

6. The cryogenic valve with a pressure relief structure according to claim 1, characterized in that: A mounting hole is provided on the inner wall of one side of the pressure relief pipe (2), a bearing is fixedly connected to the inner wall of the mounting hole, and the inner side of the inner ring of the bearing is welded to the outer side of the screw rod (9).

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