Low-temperature safety valve with leakage alarm function

Abstract

The low-temperature safety valve comprises a valve body shell composed of an installation section, a pressure relief section and a reset section, a pressure relief pipe is fixedly installed on the side face of the pressure relief section, a transversely-arranged partition plate is fixedly installed in the pressure relief section, a heat preservation material is arranged in the pressure relief section, and a communicating hole is formed in the middle of the partition plate; a sealing block matched with the communicating hole is arranged in the pressure relief section, a connecting valve rod is fixedly installed on the upper surface of the sealing block, and a reset spring located on the inner side of the reset section is fixedly installed at the upper end of the connecting valve rod. According to the low-temperature safety valve with the leakage alarm function, the device is integrally installed in a pipeline system through a flange structure of the installation section, when the pressure reaches a set value, the sealing block is jacked up, the purpose of automatic pressure relief is achieved, and in the process, a gas sensor outside the pressure relief section is used for detecting surrounding gas, so that whether gas leakage exists at the joint or not is judged; and a wireless signal is transmitted to a computer so as to achieve the purpose of automatic alarm.

Description

Technical Field

[0001] The invention relates to the technical field of safety valves, in particular to a low-temperature safety valve with leakage alarm. Background Art

[0002] A safety valve is an automatic pressure relief protection device that is installed on a pressure vessel, pipeline or pressure-bearing system. When the pressure in the system rises abnormally and exceeds the preset safety value, it automatically and quickly opens to discharge excess media, thereby preventing the system from exploding, rupturing or other catastrophic accidents due to overpressure. Among them, a cryogenic safety valve is a safety valve specially designed to work in ultra-low temperature environments.

[0003] In the prior art, Chinese patent application number CN201110032543.8 discloses a low-temperature safety valve, comprising: a valve body, a valve disc arranged in the valve body, an adjusting block arranged at the liquid outlet end of the valve body, and a spring arranged between the valve disc and the adjusting block. A valve hole penetrating the valve body is provided in the valve body, a valve disc stop surface is provided on the valve hole, a blind hole is provided at the liquid inlet end of the valve disc, radial guide holes are uniformly provided circumferentially at the bottom of the blind hole wall, a stop step is provided at the liquid inlet end of the valve disc, a sealing ring is provided on the stop step, a radial through hole is provided in the middle of the valve disc, a liquid outlet end of the valve disc is provided with a liquid outlet hole penetrating the radial through hole, a spring positioning step surface is provided on the valve disc liquid outlet hole and the axial through hole of the adjusting block, and a filter is provided on the blind hole liquid inlet of the valve disc.

[0004] For example, in the prior art, a Chinese patent application number CN202510138161.5 discloses a double-row low-temperature safety valve, which relates to the technical field of safety valves. The double-row low-temperature safety valve includes a main valve body, a valve cover and a pilot valve assembly. An inlet flow channel and an outlet flow channel are provided in the main valve body. A guide sleeve is provided in the main valve body. A first valve core is slidingly provided in the guide sleeve, and a valve seat is provided in the main valve body. A first sealing member is provided at the lower end of the first valve core. A medium accommodating chamber is formed between the first valve core and the valve cover in the guide sleeve. The pilot valve assembly is in communication with the medium accommodating chamber and the inlet flow channel, and the first sealing member and the valve seat are both elastically deformable. When the valve seat and the first sealing member are sealed together, the medium accommodating chamber is filled with medium, which forms pressure on the first valve core toward the valve seat, causing the first sealing member to squeeze the valve seat.

[0005] For example, in the prior art, a Chinese patent with application number CN201910455389.1 discloses a low-temperature spring-type safety valve, comprising a No. 1 flange, a main control pipe being fixedly mounted on the outer surface of the upper middle portion of the No. 1 flange, a No. 1 main pipe being fixedly mounted on the outer surface of the upper end of the main control pipe, a No. 3 flange being fixedly mounted on the outer surface of the upper end of the No. 1 main pipe, a connecting pipe being fixedly mounted on the outer surface of one side of the No. 1 main pipe, and a No. 2 sealing ring being provided on the outer surface of the upper end of the No. 3 flange.

[0006] Combined with the above materials, it can be seen that the safety valve in the prior art generally achieves the purpose of automatic starting and resetting through the elasticity of the spring. However, in actual use, the low-temperature medium passes through the inside of the low-temperature safety valve, and the low temperature will affect the sealing effect of the sealing component. When the pressure reaches the point where pressure relief is required, it means that the pressure is already very high. At this time, the sealing component position is prone to leakage under the action of high pressure, and the leakage is not easy to detect. Summary of the Invention

[0007] The object of the present invention is to provide a low-temperature safety valve with leakage alarm to solve the problem of difficult-to-detect leakage mentioned in the above background technology.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a low-temperature safety valve with leakage alarm, comprising a valve body shell consisting of an installation section, a pressure relief section and a reset section, a pressure relief pipe fixedly installed on the side of the pressure relief section, and a transversely arranged partition plate fixedly installed inside the pressure relief section, a heat-insulating material is arranged inside the pressure relief section, a connecting hole is opened in the middle of the partition plate, a sealing block matching the connecting hole is arranged inside the pressure relief section, and a connecting valve stem is fixedly installed on the upper surface of the sealing block, and a reset spring located on the inner side of the reset section is fixedly installed on the upper end of the connecting valve stem; a fixed frame is arranged and fixedly installed on the outside of the pressure relief section, and a mounting plate is fixedly arranged below the fixed frame, and a gas sensor for detecting leakage is fixedly installed on the lower end of the mounting plate, and a negative pressure mechanism for concentrating gas is arranged in the fixed frame; a warning light is fixedly installed on the lower end of the reset section, and a transparent window is fixedly installed on the side of the reset section, and the light of the warning light is emitted through the transparent window to remind the staff.

[0009] Preferably, the negative pressure mechanism includes a negative pressure hole opened on the lower surface of the fixed frame, and the position of the negative pressure hole corresponds to the position of the gas sensor, and the fixed frame is configured as a hollow structure as a whole, and a connecting pipe is fixedly installed on the upper surface of the fixed frame.

[0010] Preferably, the upper end of the connecting pipe is communicated with the interior of the reset section, a through hole is provided at the upper end of the reset section, and an axial flow fan for driving air flow is installed inside the reset section, and the air flow is driven by the axial flow fan.

[0011] Preferably, a contact block is fixedly installed on the inner side of the lower end of the reset section, and the contact block is electrically connected to the warning light via a first connecting wire, so that the warning light is turned on to remind surrounding staff to promptly carry out maintenance.

[0012] Preferably, the contact block is in contact with the outer surface of the connecting valve stem, and a contact strip that cooperates with the contact block is fixedly installed on the outer surface of the connecting valve stem, and the outer part of the connecting valve stem and the inner wall of the entire device are sprayed with an insulating coating.

[0013] Preferably, the contact block and the contact strip are both made of copper sheet material for current conduction, and a second connecting wire for supplying power to the contact strip is fixedly installed on the upper end of the connecting valve stem.

[0014] Preferably, an extrusion plate is fixedly mounted on the upper end of the reset spring, and a first adjusting bolt is rotatably mounted on the upper surface of the extrusion plate. The first adjusting bolt is threadedly connected to the upper end of the reset section, and a first adjusting knob is fixedly mounted on the top end of the first adjusting bolt.

[0015] Preferably, a first sealing ring and a second sealing ring are fixedly installed below the sealing block, and the first sealing ring contacts the inner wall of the communicating hole.

[0016] Preferably, two auxiliary spring rods are rotatably installed on the upper surface of the sealing block, and the auxiliary spring rods are distributed in an inclined shape. The upper end of the auxiliary spring is rotatably installed with a connecting block that drives it to move, and the side of the connecting block is rotatably installed with a second adjusting bolt. The auxiliary spring rods can be used to assist in applying extrusion force to the sealing block, and the device's starting threshold can be accurately adjusted by changing the elasticity of the auxiliary spring rods.

[0017] Preferably, the second adjusting bolt is threadedly connected to the pressure relief section, and a second adjusting knob is fixedly mounted on the top end of the second adjusting bolt.

[0018] Compared with the prior art, the present invention has the following beneficial effects: the low-temperature safety valve with leakage alarm adopts a new structural design, the specific contents of which are as follows: 1. Use the flange structure of the installation section to install the device as a whole into the pipeline system. When the pressure reaches the set value, the sealing block will be lifted to achieve the purpose of automatic pressure relief. During this process, the gas sensor outside the pressure relief section is used to detect the surrounding gas to determine whether there is a gas leak at the connection. The signal is transmitted to the computer via wireless signal to achieve the purpose of automatic alarm. Furthermore, during the use of the device, the axial flow fan inside the reset section is turned on, and the axial flow fan is used to drive the air flow, thereby forming a negative pressure inside the fixed frame through the connecting pipe. Under the action of the negative pressure, the surrounding air is sucked into the negative pressure hole, so that the air is concentrated through the gas sensor position, making the detection more accurate, and the normal temperature air in the connecting pipe is passed into the reset section to prevent the low temperature from affecting the elastic force of the reset spring.

[0019] 2. When the pressure is about to reach the maximum threshold, although the pressure has not reached the effect of completely lifting the sealing block, it will cause the sealing block to move upward a short distance. At this time, the contact strip connected to the outer surface of the valve stem contacts the contact block inside the device, so that the current of the second connecting wire is transmitted to the warning light through the contact strip, contact block and second connecting wire. Finally, the warning light lights up to remind the staff to repair and eliminate the fault in time before the pressure is about to reach the starting value.

[0020] 3. Before using the device, the extrusion plate is moved up and down by rotating the first adjusting bolt, thereby changing the extrusion amount of the reset spring to achieve the purpose of changing the device's starting threshold. Since the reset spring is the main source of elastic force, the elastic force varies greatly during adjustment and cannot be adjusted accurately. At this time, the connecting block is driven to move by the second adjusting bolt to change the angle of the auxiliary spring rod. The elastic force of the auxiliary spring rod is used to change the starting threshold in a small range, so that the device can be adjusted more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the valve body shell of the present invention; Figure 3 This is a schematic diagram of the fixed frame structure of the present invention; Figure 4 This is a schematic diagram of the lower surface structure of the fixing frame of the present invention; Figure 5 This is a schematic diagram of the structure of the partition plate of the present invention; Figure 6 This is a schematic diagram of the structure of the axial flow fan of the present invention; Figure 7 This is a schematic diagram of the valve stem connection structure of the present invention; Figure 8 For the present invention Figure 5 A in the middle is an enlarged structural diagram; Figure 9 For the present invention Figure 2 The enlarged structural diagram at B in the middle; Figure 10 This is a schematic diagram of the auxiliary spring rod structure of the present invention; Figure 11 This is a schematic diagram of the lower surface structure of the sealing block of the present invention.

[0022] In the figure: 1. Valve body shell; 101. Installation section; 102. Pressure relief section; 103. Reset section; 2. Pressure relief pipe; 3. Partition plate; 4. Connecting hole; 5. Sealing block; 501. First sealing ring; 502. Second sealing ring; 6. Connecting valve stem; 7. Reset spring; 8. Extrusion plate; 9. First adjusting bolt; 10. First adjusting knob; 11. Fixing frame; 12. Installation plate; 13. Gas sensor; 14. Negative pressure hole; 15. Connecting pipe; 16. Through hole; 17. Axial fan; 18. Warning light; 19. Contact block; 20. First connecting wire; 21. Transparent window; 22. Contact strip; 23. Second connecting wire; 24. Auxiliary spring rod; 25. Connecting block; 26. Second adjusting bolt; 27. Second adjusting knob. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Example 1: Please refer to Figure 1-Figure 4 In order to achieve the purpose of detecting leakage and automatically alarming, the present embodiment provides the following technical solutions, which specifically disclose: a valve body shell 1 consisting of a mounting section 101, a pressure relief section 102 and a reset section 103, a pressure relief pipe 2 is fixedly mounted on the side of the pressure relief section 102, and a transversely arranged partition plate 3 is fixedly mounted inside the pressure relief section 102, a heat-insulating material is arranged inside the pressure relief section 102, a connecting hole 4 is provided in the middle of the partition plate 3, a sealing block 5 is arranged inside the pressure relief section 102 to match the connecting hole 4, and a valve stem 6 is fixedly mounted on the upper surface of the sealing block 5, and a reset spring 7 located on the inner side of the reset section 103 is fixedly mounted on the upper end of the valve stem 6, and a fixed spring 7 is provided on the outside of the pressure relief section 102 to match the connecting hole 4. A fixing frame 11 is installed, and a mounting plate 12 is fixedly arranged below the fixing frame 11, and a gas sensor 13 for detecting leakage is fixedly installed at the lower end of the mounting plate 12, and a negative pressure mechanism for concentrating gas is provided in the fixing frame 11, and the negative pressure mechanism includes a negative pressure hole 14 opened on the lower surface of the fixing frame 11, and the position of the negative pressure hole 14 corresponds to the position of the gas sensor 13, and the fixing frame 11 is set as a hollow structure as a whole, and a connecting pipe 15 is fixedly installed on the upper surface of the fixing frame 11, the upper end of the connecting pipe 15 is connected to the interior of the reset section 103, and a through hole 16 is opened at the upper end of the reset section 103, and an axial flow fan 17 for driving air flow is installed inside the reset section 103.

[0025] When using the device, first use the flange structure at the bottom of the installation section 101 to fix the device in the pipeline system (the pipeline system transports low-temperature media). When the pressure value in the pipeline system exceeds the set threshold, the sealing block 5 is pushed upward under the action of pressure, so that the sealing block 5 is separated from the seal between the connecting hole 4. At this time, the medium in the pipeline system passes through the connecting hole 4 in the middle of the partition plate 3 and is discharged from the pressure relief pipe 2, achieving the purpose of automatic pressure relief, avoiding the risk of explosion due to excessive pressure in the pipeline system. When the device is working normally, the axial flow fan 17 inside the reset section 103 is turned on, and the axial flow fan 17 is used to drive the air flow to fill the air inside the reset section 103. The gas is discharged through the through hole 16, thereby forming a negative pressure inside the reset section 103. The negative pressure is also formed inside the fixed frame 11 through the connecting pipe 15. Under the action of the negative pressure, the surrounding air (especially the flange connection position) is sucked into the negative pressure hole 14. During the suction, the flow path of the air passes through the position of the gas sensor 13. The gas sensor 13 is used to detect the gas composition, so as to achieve the purpose of determining whether there is a leak. If a leak is found, it is transmitted to the computer of the operator through a wireless signal to achieve the purpose of automatic alarm. In addition, the air at normal temperature enters the reset section 103 through the connecting pipe 15, maintains the internal temperature of the reset section 103, and prevents the low temperature from affecting the elasticity of the reset spring 7.

[0026] Example 2: Please refer to Figure 5-Figure 8 In order to achieve the purpose of early warning and timely maintenance before take-off, this embodiment provides the following technical solutions, which specifically disclose: a warning light 18 is fixedly installed at the lower end of the reset section 103, and a transparent window 21 is fixedly installed on the side of the reset section 103. The light of the warning light 18 is emitted through the transparent window 21 to remind the staff. A contact block 19 is fixedly installed on the inner side of the lower end of the reset section 103, and the contact block 19 is electrically connected to the warning light 18 using a first connecting wire 20. The contact block 19 is in contact with the outer surface of the connecting valve stem 6, and a contact strip 22 that cooperates with the contact block 19 is fixedly installed on the outer surface of the connecting valve stem 6. The contact block 19 and the contact strip 22 are both set to a copper sheet material for current conduction, and a second connecting wire 23 for supplying power to the contact strip 22 is fixedly installed on the upper end of the connecting valve stem 6.

[0027] When a minor fault occurs in the pipeline system, although the pressure cannot cause the device to reach the tripping threshold, long-term high pressure still poses a certain danger. At this time, the sealing block 5 is pushed up a short distance under the action of pressure (before reaching the tripping position), and the sealing block 5 drives the connecting valve stem 6 to move upward synchronously, thereby moving the contact strip 22 on the side of the connecting valve stem 6 to a position in contact with the contact block 19 inside the device. At this time, the current of the second connecting wire 23 is transmitted to the contact strip 22 through the connecting valve stem 6 (the connecting valve stem 6 and the inside of the device are both provided with an insulating coating), and then transmitted to the contact block 19 through the contact strip 22. Finally, the first connecting wire 20 is used to power the warning light 18, so that the warning light 18 lights up, and the light of the warning light 18 is emitted through the transparent window 21, reminding the surrounding staff so that the staff can carry out maintenance in time to avoid long-term high pressure affecting the service life of the pipeline system.

[0028] Example 3: Please refer to Figures 9-11 In order to achieve the purpose of accurately adjusting the jump threshold, this embodiment provides the following technical solutions, which specifically disclose: an extrusion plate 8 is fixedly installed on the upper end of the return spring 7, and a first adjusting bolt 9 is rotatably installed on the upper surface of the extrusion plate 8. The first adjusting bolt 9 is threadedly connected to the upper end of the return section 103, and a first adjusting knob 10 is fixedly installed on the top of the first adjusting bolt 9. A first sealing ring 501 and a second sealing ring 502 are fixedly installed below the sealing block 5, and the first sealing ring 501 contacts the inner wall of the communicating hole 4. Two auxiliary spring rods 24 are rotatably installed on the upper surface of the sealing block 5. The auxiliary spring rods 24 are distributed in an inclined shape, and a connecting block 25 that drives the auxiliary spring rods 24 to move is rotatably installed on the upper end, and a second adjusting bolt 26 is rotatably installed on the side of the connecting block 25. The second adjusting bolt 26 is threadedly connected to the pressure relief section 102, and a second adjusting knob 27 is fixedly installed on the top of the second adjusting bolt 26.

[0029] Before using the device, the first adjusting bolt 9 is rotated through the first adjusting knob 10 according to actual practical needs, so that the first adjusting bolt 9 drives the extrusion plate 8 to move up and down, thereby changing the compression amount of the return spring 7 through the extrusion plate 8 (the spring force of different compression amounts is different), thereby achieving the purpose of adjusting the starting threshold of the device. Since the change in the compression amount of the return spring 7 has a greater impact on the threshold, it is necessary to cooperate with the second adjusting knob 27, that is, after rotating the first adjusting knob 10, then rotate the second adjusting knob 27, and use the second adjusting knob 27 to drive the second adjusting bolt 26 to rotate, and use the second adjusting bolt 26 to be threadedly connected to the device, so that the second adjusting bolt 26 drives the connecting block 25 to move, and when the connecting block 25 moves, it drives the auxiliary spring rod 24 to adjust the angle. Since the auxiliary spring rod 24 is tilted, the auxiliary spring rod 24 at different angles has different pressures on the sealing block 5, thereby achieving the purpose of assisting in squeezing the sealing block 5. Finally, the cooperation between the first adjusting knob 10 and the second adjusting knob 27 achieves the purpose of precise adjustment of the threshold.

[0030] In the description of the present invention, unless otherwise specified, "plurality" means two or more; terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A low-temperature safety valve with a leakage alarm, comprising a valve body shell (1) consisting of a mounting section (101), a pressure relief section (102) and a reset section (103), wherein a pressure relief pipe (2) is fixedly mounted on the side of the pressure relief section (102), and a transversely arranged partition plate (3) is fixedly mounted inside the pressure relief section (102), a heat-insulating material is arranged inside the pressure relief section (102), and a connecting hole (4) is provided in the middle of the partition plate (3), characterized in that: Also includes: A sealing block (5) cooperating with the communicating hole (4) is provided inside the pressure relief section (102), and a connecting valve stem (6) is fixedly mounted on the upper surface of the sealing block (5), and a reset spring (7) located inside the reset section (103) is fixedly mounted on the upper end of the connecting valve stem (6); A fixed frame (11) is provided outside the pressure relief section (102) and fixedly installed thereon, a mounting plate (12) is fixedly provided below the fixing frame (11), and a gas sensor (13) for detecting leakage is fixedly installed at the lower end of the mounting plate (12), and a negative pressure mechanism for concentrating gas is provided in the fixing frame (11); A warning light (18) is fixedly installed at the lower end of the interior of the reset section (103), and a transparent window (21) is fixedly installed on the side of the reset section (103). Light from the warning light (18) is emitted through the transparent window (21) to remind staff.

2. A cryogenic safety valve with leakage alarm according to claim 1, characterized in that: The negative pressure mechanism comprises a negative pressure hole (14) provided on the lower surface of the fixed frame (11), and the position of the negative pressure hole (14) corresponds to the position of the gas sensor (13), and the fixed frame (11) is configured as a hollow structure as a whole, and a connecting pipe (15) is fixedly installed on the upper surface of the fixed frame (11).

3. A cryogenic safety valve with leakage alarm according to claim 2, characterized in that: The upper end of the connecting pipe (15) is in communication with the interior of the reset section (103), a through hole (16) is provided at the upper end of the reset section (103), and an axial flow fan (17) for driving air flow is installed inside the reset section (103).

4. The cryogenic safety valve with leakage alarm according to claim 1, characterized in that: A contact block (19) is fixedly mounted on the inner side of the lower end of the reset section (103), and the contact block (19) is electrically connected to the warning light (18) via a first connecting wire (20).

5. A cryogenic safety valve with leakage alarm according to claim 4, characterized in that: The contact block (19) is in close contact with the outer surface of the connecting valve stem (6), and a contact strip (22) that cooperates with the contact block (19) is fixedly mounted on the outer surface of the connecting valve stem (6).

6. A cryogenic safety valve with leakage alarm according to claim 5, characterized in that: The contact block (19) and the contact strip (22) are both made of copper sheet material for current conduction, and a second connecting wire (23) for supplying power to the contact strip (22) is fixedly mounted on the upper end of the connecting valve stem (6).

7. The cryogenic safety valve with leakage alarm according to claim 1, characterized in that: The upper end of the reset spring (7) is fixedly mounted with an extrusion plate (8), and the upper surface of the extrusion plate (8) is rotatably mounted with a first adjustment bolt (9), the first adjustment bolt (9) is threadedly connected to the upper end of the reset section (103), and the top end of the first adjustment bolt (9) is fixedly mounted with a first adjustment knob (10).

8. The cryogenic safety valve with leakage alarm according to claim 1, characterized in that: A first sealing ring (501) and a second sealing ring (502) are fixedly installed below the sealing block (5), and the first sealing ring (501) contacts the inner wall of the communicating hole (4).

9. The cryogenic safety valve with leakage alarm according to claim 8, characterized in that: Two auxiliary spring rods (24) are rotatably mounted on the upper surface of the sealing block (5), the auxiliary spring rods (24) are distributed in an inclined shape, and a connecting block (25) for driving the auxiliary spring rods (24) is rotatably mounted on the upper end thereof, and a second adjusting bolt (26) is rotatably mounted on the side of the connecting block (25).

10. The cryogenic safety valve with leakage alarm according to claim 9, characterized in that: The second adjusting bolt (26) is threadedly connected to the pressure relief section (102), and a second adjusting knob (27) is fixedly mounted on the top end of the second adjusting bolt (26).

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