A cryogenic safety valve with leak alarm

Abstract

The application discloses a low-temperature safety valve with a leakage alarm, which 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 surface of the pressure relief section, and a transversely arranged partition plate is fixedly installed inside the pressure relief section. Heat preservation material is arranged inside the pressure relief section. A communication hole is formed in the middle position of the partition plate. A sealing block matched with the communication hole is arranged inside the pressure relief section. A connecting valve rod is fixedly installed on the upper surface of the sealing block. A reset spring is fixedly installed on the upper end of the connecting valve rod and located inside the reset section. The low-temperature safety valve with the leakage alarm is installed into a pipeline system as a whole through the flange structure of the installation section. When the pressure reaches a set value, the sealing block is lifted up, so that the purpose of automatic pressure relief is achieved. In the process, a gas sensor outside the pressure relief section is used to detect the surrounding gas, so that whether the gas leaks at the connecting position is judged. The purpose of automatic alarm is achieved by transmitting the wireless signal to a computer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of safety valve, in particular to a low-temperature safety valve with leakage alarm. BACKGROUND

[0002] The safety valve is an automatic pressure relief device, which is installed on the pressure vessel, pipeline or pressure-bearing system. When the pressure in the system abnormally rises and exceeds the preset safety value, it automatically and quickly opens to discharge the excess medium, thereby preventing the system from exploding, rupturing or other catastrophic accidents due to overpressure. The low-temperature safety valve is a safety valve specially designed for use in ultra-low temperature environment.

[0003] In the prior art, a low-temperature safety valve is disclosed in Chinese Patent No. CN201110032543.8, which comprises 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 is arranged through the valve body, and a valve disc stop surface is arranged on the valve hole. The liquid inlet end of the valve disc is provided with a blind hole, and the bottom of the blind hole wall is uniformly provided with radial flow guide holes. The liquid inlet end of the valve disc is provided with a stop step, and the stop step is provided with a sealing ring. The middle part of the valve disc is provided with a radial through hole, and the liquid outlet end of the valve disc is provided with a liquid outlet hole communicating with the radial through hole. Spring positioning step surfaces are arranged on the valve disc liquid outlet hole and the axial through hole of the adjusting block, respectively. The blind hole liquid inlet of the valve disc is provided with a filter screen.

[0004] For example, a double-row low-temperature safety valve is disclosed in Chinese Patent No. CN202510138161.5, which belongs to the technical field of safety valves. It comprises a main valve body, a valve cover and a pilot valve assembly. An inlet flow channel and an outlet flow channel are arranged in the main valve body. A guide sleeve is arranged in the main valve body. A first valve core is slidably arranged in the guide sleeve. A valve seat is arranged in the main valve body. A first sealing element is arranged at the lower end of the first valve core. A medium containing cavity is formed between the first valve core and the valve cover in the guide sleeve. The pilot valve assembly communicates with the medium containing cavity and the inlet flow channel. The first sealing element and the valve seat can be elastically deformed. When the valve seat and the first sealing element are in sealing cooperation, the medium containing cavity is filled with medium, which forms pressure on the first valve core towards the valve seat, causing the first sealing element to press the valve seat.

[0005] For example, a low-temperature spring safety valve is disclosed in Chinese Patent No. CN201910455389.1, which comprises a first flange plate, a main control pipeline fixedly installed on the upper end of the outer surface of the first flange plate, a first main body pipeline fixedly installed on the upper end of the outer surface of the main control pipeline, a third flange plate fixedly installed on the upper end of the outer surface of the first main body pipeline, a connecting pipeline fixedly installed on the outer surface of one side of the first main body pipeline, and a second sealing ring arranged on the upper end of the outer surface of the third flange plate.

[0006] In combination with the above material, the safety valve in the prior art generally achieves the purpose of automatic jumping and resetting through the elasticity of the spring, but in the actual use process, the low-temperature safety valve is passed through the low-temperature medium, and the low temperature affects the sealing effect of the sealing assembly. When the pressure reaches the required pressure relief, it means that the pressure is already very high, at this time, the position of the sealing assembly is easy to leak under the action of high pressure, and the leakage is not easy to detect. SUMMARY

[0007] The purpose of the present application is to provide a low-temperature safety valve with leakage alarm to solve the problem of difficult detection of leakage in the background art.

[0008] To achieve the above purpose, the present application provides the following technical scheme: a low-temperature safety valve with leakage alarm, comprising a valve body shell composed of a mounting section, a pressure relief section and a reset section, the pressure relief section is fixedly installed with a pressure relief pipe on the side surface, and a transversely arranged partition plate is fixedly installed inside the pressure relief section, the inside of the pressure relief section is provided with a heat preservation material, a communication hole is formed in the middle position of the partition plate, a sealing block is arranged in the pressure relief section, and a connecting valve rod is fixedly installed on the upper surface of the sealing block, and a reset spring is fixedly installed on the upper end of the connecting valve rod inside the reset section; a fixed frame is fixedly installed outside the pressure relief section, an installation plate is fixedly arranged below the fixed frame, a gas sensor for detecting leakage is fixedly installed on the lower end of the installation plate, and a negative pressure mechanism for concentrating gas is arranged in the fixed frame.

[0009] Preferably, the negative pressure mechanism comprises a negative pressure hole formed in the lower surface of the fixed frame, the position of the negative pressure hole corresponds to the position of the gas sensor, the fixed frame is integrally provided as a hollow structure, and a connecting pipeline is fixedly installed on the upper surface of the fixed frame.

[0010] Preferably, the upper end of the connecting pipeline is in communication with the inside of the reset section, a through hole is formed in the upper end of the reset section, and an axial flow fan for driving air flow is installed in the inside of the reset section.

[0011] Preferably, a contact block is fixedly installed inside the lower end of the reset section, the contact block is electrically connected with the prompt lamp through a first connecting wire, and the light of the prompt lamp is used to remind the surrounding workers to repair in time.

[0012] Preferably, the contact block is in contact with the outer surface of the connecting valve rod, a contact strip matched with the contact block is fixedly installed on the outer surface of the connecting valve rod, and the outer part of the connecting valve rod and the inner wall of the whole 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 the second connecting wire is fixedly installed on the upper end of the valve stem for supplying power to the contact strip.

[0014] Preferably, the upper end of the reset spring is fixedly installed with a pressing plate, the upper surface of the pressing plate is rotatably installed with a first adjusting screw, the first adjusting screw is threadedly connected with the upper end of the reset section, and the top end of the first adjusting screw is fixedly installed with a first adjusting knob.

[0015] Preferably, the lower side of the sealing block is fixedly installed with a first sealing ring and a second sealing ring, and the first sealing ring contacts the inner wall of the communication hole.

[0016] Preferably, the upper surface of the sealing block is rotatably installed with two auxiliary spring rods, the auxiliary spring rods are distributed in an inclined manner, the upper end of the auxiliary spring is rotatably installed with a connecting block for moving the auxiliary spring, the side surface of the connecting block is rotatably installed with a second adjusting screw, the auxiliary spring rod can assist in applying a pressing force to the sealing block, and the elastic force of the auxiliary spring rod can be changed to accurately adjust the take-off threshold of the device.

[0017] Preferably, the second adjusting screw is threadedly connected with the pressure relief section, and the top end of the second adjusting screw is fixedly installed with a second adjusting knob.

[0018] Compared with the prior art, the low-temperature safety valve with leakage alarm has the following beneficial effects:

[0019] 1. The device is installed in the pipeline system by using the flange structure of the installation section, the sealing block is lifted when the pressure reaches the set value, and the purpose of automatic pressure relief is achieved, the gas sensor outside the pressure relief section is used to detect the surrounding gas during the process, so as to judge whether there is gas leakage at the connection, and the purpose of automatic alarm is achieved by transmitting the wireless signal to the computer;

[0020] Further, the shaft flow fan inside the reset section is turned on during use of the device, the shaft flow fan drives air flow, so that negative pressure is formed in the fixed frame through the connecting pipeline, air is sucked into the negative pressure hole under the action of the negative pressure, so that the air concentrates through the position of the gas sensor, the detection is more accurate, and the normal temperature air in the connecting pipeline is introduced into the reset section, so as to avoid the influence of low temperature on the elastic force of the reset spring.

[0021] 2. When the pressure is about to reach the maximum threshold, although the pressure has not reached the point of completely lifting the sealing block, it will still cause the sealing block to move upward a small distance. At this time, the contact strip on the outer surface of the connecting valve stem contacts the contact block inside the device, so that the current of the second connecting wire is transmitted to the indicator light through the contact strip, the contact block and the second connecting wire. Finally, the indicator light will light up to remind the staff to check and troubleshoot the fault in time before the pressure is about to reach the starting value.

[0022] 3. Before using the device, rotate the first adjusting bolt to move the extrusion plate up and down, thereby changing the extrusion amount of the return spring and thus changing the device's starting threshold. Since the return spring is the main source of elastic force, its elastic force changes significantly during adjustment and cannot be precisely adjusted. At this time, the second adjusting bolt moves the connecting block to change the angle of the auxiliary spring rod. The starting threshold is adjusted within a small range by changing the elastic force of the auxiliary spring rod, allowing the device to be adjusted more precisely. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the internal structure of the valve body shell of the present invention;

[0025] Figure 3 This is a schematic diagram of the fixed frame structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the lower surface structure of the fixed frame of the present invention;

[0027] Figure 5 This is a schematic diagram of the partition plate structure of the present invention;

[0028] Figure 6 This is a schematic diagram of the axial fan structure of the present invention;

[0029] Figure 7 This is a schematic diagram of the connecting valve stem structure of the present invention;

[0030] Figure 8 For the present invention Figure 5 Enlarged structural diagram at point A in the middle;

[0031] Figure 9 For the present invention Figure 2 Enlarged structural diagram at point B;

[0032] Figure 10 This is a schematic diagram of the auxiliary spring rod structure of the present invention;

[0033] Figure 11 This is a schematic diagram of the lower surface structure of the sealing block of the present invention.

[0034] In the figure: 1, valve body shell; 101, mounting section; 102, pressure relief section; 103, reset section; 2, pressure relief pipe; 3, partition plate; 4, communication 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, fixed frame; 12, mounting plate; 13, gas sensor; 14, negative pressure hole; 15, connecting pipeline; 16, through hole; 17, axial flow fan; 18, prompt 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

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0036] Embodiment one: please refer to Figures 1-4 In order to achieve the purpose of detecting leakage and automatically alarming, the embodiment provides the following technical solutions, and specifically discloses: a valve body shell 1 composed of a mounting section 101, a pressure relief section 102 and a reset section 103, the pressure relief section 102 is fixedly installed with a pressure relief pipe 2 on the side surface, a partition plate 3 is fixedly installed inside the pressure relief section 102 and arranged transversely, a heat preservation material is arranged inside the pressure relief section 102, a communication hole 4 is formed at the middle position of the partition plate 3, a sealing block 5 is arranged inside the pressure relief section 102 and matched with the communication hole 4, a connecting valve stem 6 is fixedly installed on the upper surface of the sealing block 5, a reset spring 7 is fixedly installed at the inner side of the reset section 103 and located at the upper end of the connecting valve stem 6, a fixed frame 11 is arranged outside the pressure relief section 102 and fixedly installed, a mounting plate 12 is fixedly arranged below the fixed frame 11, a gas sensor 13 for detecting leakage is fixedly installed at the lower end of the mounting plate 12, a negative pressure mechanism for concentrating gas is arranged in the fixed frame 11, the negative pressure mechanism includes a negative pressure hole 14 formed in the lower surface of the fixed frame 11, the position of the negative pressure hole 14 corresponds to the position of the gas sensor 13, the fixed frame 11 is arranged as a hollow structure as a whole, a connecting pipeline 15 is fixedly installed on the upper surface of the fixed frame 11, the upper end of the connecting pipeline 15 is communicated with the inside of the reset section 103, a through hole 16 is formed 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.

[0037] In use of the device, first of all, the flange structure at the bottom of the mounting section 101 is used to fix the device in the pipeline system (low-temperature medium is transported in the pipeline system), when the pressure value in the pipeline system exceeds the set threshold value, the sealing block 5 is lifted up under the action of the pressure, so that the sealing block 5 is separated from the sealing between the communication hole 4, at this time, the medium in the pipeline system is discharged from the pressure relief pipe 2 through the communication hole 4 in the middle of the partition plate 3, to achieve the purpose of automatic pressure relief, avoid the explosion danger caused by excessive pressure in the pipeline system, open the axial flow fan 17 in the reset section 103 during normal operation of the device, use the axial flow fan 17 to drive the air flow, discharge the air in the reset section 103 through the through hole 16, so that a negative pressure is formed in the reset section 103, through the connecting pipe 15, the inside of the fixed frame 11 is also formed with a negative pressure, under the action of the negative pressure, the surrounding air (especially the flange connection position) is sucked into the negative pressure hole 14, when the air is sucked, 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 judging whether there is leakage, and the normal temperature air enters the inside of the reset section 103 through the connecting pipe 15, maintains the temperature in the reset section 103, avoids the influence of low temperature on the elasticity of the reset spring 7.

[0038] Embodiment two: please refer to Figures 5-8 , in order to achieve the purpose of early warning and timely repair before take-off, the following technical scheme is provided, specifically disclosed: the reset section 103 is fixedly installed with a prompt light 18 at the lower end, and the reset section 103 is fixedly installed with a transparent window 21 on the side, the light of the prompt light 18 is scattered through the transparent window 21 to remind the staff, the reset section 103 is fixedly installed with a contact block 19 at the inner side of the lower end, and the contact block 19 is electrically connected with the prompt light 18 through the first connecting wire 20, the contact block 19 is in contact with the outer surface of the connecting valve rod 6, and the outer surface of the connecting valve rod 6 is fixedly installed with a contact strip 22 matched with the contact block 19, the contact block 19 and the contact strip 22 are both made of copper sheet material for current conduction, and the connecting valve rod 6 is fixedly installed with a second connecting wire 23 for supplying power to the contact strip 22 at the upper end.

[0039] When the pipeline system has a slight failure, the pressure cannot make the device reach the take-off threshold, but the long-term high pressure still exists certain danger, at this time the sealing block 5 is lifted up a small distance (not reaching the take-off position) under the action of the pressure, the sealing block 5 drives the connecting valve rod 6 to move upward synchronously, thereby moving the contact strip 22 on the side of the connecting valve rod 6 to the position of contacting the contact block 19 inside the device, at this time the current of the second connecting wire 23 is transmitted into the contact strip 22 through the connecting valve rod 6 (both the connecting valve rod 6 and the inside of the device are provided with an insulating coating), and then is transmitted into the contact block 19 through the contact strip 22, finally the first connecting wire 20 is used to supply power to the prompt lamp 18, so that the prompt lamp 18 is lighted, the light of the prompt lamp 18 is scattered through the transparent window 21, reminding the surrounding workers, so that the workers can timely overhaul, avoiding the influence of long-term high pressure on the service life of the pipeline system.

[0040] Embodiment three: please refer to Figures 9-11 In order to achieve the purpose of accurately adjusting the take-off threshold, the embodiment provides the following technical scheme, specifically discloses that the upper end of the reset spring 7 is fixedly installed with the extrusion plate 8, the upper surface of the extrusion plate 8 is rotatably installed with the first adjusting screw 9, the first adjusting screw 9 is threadedly connected with the upper end of the reset section 103, the top end of the first adjusting screw 9 is fixedly installed with the first adjusting knob 10, the lower side of the sealing block 5 is fixedly installed with the first sealing ring 501 and the second sealing ring 502, the first sealing ring 501 contacts the inner wall of the through hole 4, the upper surface of the sealing block 5 is rotatably installed with two auxiliary spring rods 24, the auxiliary spring rods 24 are distributed in an inclined manner, the upper end of each auxiliary spring rod 24 is rotatably installed with a connecting block 25 for driving the auxiliary spring rod 24 to move, and the side surface of the connecting block 25 is rotatably installed with the second adjusting screw 26, the second adjusting screw 26 is threadedly connected with the pressure relief section 102, and the top end of the second adjusting screw 26 is fixedly installed with the second adjusting knob 27.

[0041] Before the device is used, the first adjusting screw 9 is rotated by the first adjusting knob 10 according to the actual practical needs, so that the first adjusting screw 9 drives the extrusion plate 8 to move up and down, thereby changing the compression amount of the reset spring 7 through the extrusion plate 8 (the spring force of the spring with different compression amounts is different), so as to achieve the purpose of adjusting the take-off threshold of the device, since the change of the compression amount of the reset spring 7 has a greater influence on the threshold, the second adjusting knob 27 needs to be cooperated, that is, after the first adjusting knob 10 is rotated, the second adjusting knob 27 is further rotated, the second adjusting screw 26 is driven to rotate by the second adjusting knob 27, the second adjusting screw 26 is threadedly connected with the device, so that the second adjusting screw 26 drives the connecting block 25 to move, the connecting block 25 drives the auxiliary spring rod 24 to adjust the angle when the connecting block 25 moves, since the auxiliary spring rod 24 is arranged in an inclined manner, the auxiliary spring rod 24 with different angles has different pressures on the sealing block 5, so as to achieve the purpose of auxiliary extrusion of the sealing block 5, and finally the cooperation between the first adjusting knob 10 and the second adjusting knob 27 achieves the purpose of accurately adjusting the threshold.

[0042] In the description of the application, unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0043] Although embodiments of the application have been shown and described, it will be understood by those having ordinary skill in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. A low-temperature safety valve with leakage alarm, comprising a valve body shell (1) composed of a mounting section (101), a pressure relief section (102) and a reset section (103), the pressure relief section (102) is fixedly installed with a pressure relief pipe (2) on the side surface, and a transversely arranged partition plate (3) is fixedly installed inside the pressure relief section (102), the inside of the pressure relief section (102) is provided with a heat preservation material, and a communication hole (4) is formed in the middle position of the partition plate (3), characterized in that, Also include: The sealing block (5) is arranged in the pressure relief section (102) and communicates with the connecting hole (4), and the upper surface of the sealing block (5) is fixedly connected with the valve rod (6), and the upper end of the valve rod (6) is fixedly connected with the reset spring (7) arranged in the reset section (103); The outer side of the pressure relief section (102) is provided with a fixed frame (11) fixedly arranged, and the lower side of the fixed frame (11) is provided with a mounting plate (12) fixedly arranged, and the lower end of the mounting plate (12) is fixedly arranged with a gas sensor (13) for detecting leakage, and the fixed frame (11) is provided with a negative pressure mechanism for concentrating gas; The lower end of the reset section (103) is fixedly arranged with a prompt lamp (18), and the side of the reset section (103) is fixedly arranged with a transparent window (21), and the light of the prompt lamp (18) is scattered through the transparent window (21) to remind the staff; The negative pressure mechanism includes a negative pressure hole (14) opened in 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 arranged as a hollow structure, and the upper surface of the fixed frame (11) is fixedly connected with a connecting pipe (15), the upper end of the connecting pipe (15) is communicated with the inside of the reset section (103), and the upper end of the reset section (103) is provided with a through hole (16), and the inside of the reset section (103) is provided with an axial flow fan (17) for driving air flow.

2. A cryogenic safety valve with leak alert according to claim 1, characterized in that: The lower end of the reset section (103) is fixedly arranged with a contact block (19), and the contact block (19) is electrically connected with the prompt lamp (18) by a first connecting wire (20).

3. A cryogenic safety valve with leak alert according to claim 2, characterized in that: The contact block (19) is in contact with the outer surface of the connecting valve rod (6), and the outer surface of the connecting valve rod (6) is fixedly connected with a contact strip (22) matched with the contact block (19).

4. A cryogenic safety valve with leak alert according to claim 3, characterized in that: The contact block (19) and the contact strip (22) are both made of copper sheet material for current conduction, and the upper end of the connecting valve rod (6) is fixedly connected with a second connecting wire (23) for supplying power to the contact strip (22).

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

6. A cryogenic safety valve with leak alert according to claim 1, characterized in that: The lower side of the sealing block (5) is fixedly arranged with a first sealing ring (501) and a second sealing ring (502), and the first sealing ring (501) contacts the inner wall of the connecting hole (4).

7. A cryogenic safety valve with leak alert according to claim 6, characterized in that: The upper surface of the sealing block (5) is rotatably arranged with two auxiliary spring rods (24), the auxiliary spring rods (24) are arranged in an inclined manner, the upper end of the auxiliary spring rod (24) is rotatably arranged with a connecting block (25) for driving the auxiliary spring rod (24) to move, and the side of the connecting block (25) is rotatably arranged with a second adjusting bolt (26).

8. A cryogenic safety valve with leak alert according to claim 7, characterized in that: The second adjusting bolt (26) is threadedly connected with the pressure relief section (102), and the top end of the second adjusting bolt (26) is fixedly arranged with a second adjusting knob (27).

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