Explosion-proof test system of low-temperature valve

Abstract

The utility model belongs to the technical field of valve testing, and particularly relates to an explosion-proof testing system of a low-temperature valve, which comprises a testing room, a mounting pit is arranged on the ground of the testing room, a low-temperature tank, a ventilation system and a leakage rate detection system are arranged in the mounting pit, the low-temperature tank is connected with a liquid nitrogen filling system, and the ventilation system is connected with a liquid nitrogen outlet. A temperature detection system is arranged in the low-temperature tank, and a valve to be detected is placed in the low-temperature tank and communicated with the high-pressure gas conveying system. According to the utility model, through the low-temperature tank, the liquid nitrogen filling system, the temperature detection system and the high-pressure gas conveying system, remote testing of the low-temperature valve is realized, the testing efficiency of the low-temperature valve is greatly improved, the safety of testing personnel is ensured, and the environment of a testing site is detected and ventilated through the ventilation system and the leakage rate detection system; and the safety of testers in the valve dismounting and mounting process is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of valve testing technology, and in particular relates to an explosion-proof testing system for cryogenic valves. Background Technology

[0002] With the development of chemical production, new energy technologies, and aerospace, cryogenic valves are being used in many applications. To meet the demands of cryogenic valves in harsh operating conditions, cryogenic tests are required before they leave the factory to verify their performance.

[0003] However, existing conventional testing equipment for cryogenic valves is usually a single test chamber, which has low safety performance, poor reliability, low degree of automation and digitization, and cannot conduct tests safely and efficiently, posing certain safety hazards. Summary of the Invention

[0004] Therefore, this utility model provides an explosion-proof testing system for cryogenic valves to solve the problems of low safety performance, poor reliability, and potential safety hazards of existing cryogenic valve testing devices.

[0005] The technical solution of this utility model is as follows: an explosion-proof testing system for cryogenic valves, comprising: a testing room, wherein an installation pit is provided on the ground of the testing room, and a cryogenic tank, a ventilation system and a leakage detection system are provided in the installation pit, the cryogenic tank is connected to a liquid nitrogen filling system, a temperature detection system is provided in the cryogenic tank, and the valve to be tested is placed in the cryogenic tank and connected to a high-pressure gas delivery system.

[0006] Furthermore, the high-pressure gas delivery system includes: a test gas source, a pressure reducer, a delivery pipeline, a low-pressure control switch, a booster control switch, a booster pump, a low-pressure input branch, and a high-pressure input branch;

[0007] The test gas source is connected to the input terminal of the pressure reducer. The output terminal of the pressure reducer is connected to one end of the low-pressure control switch and one end of the boost control switch via a delivery pipeline. The other end of the low-pressure control switch is connected to the low-pressure input branch, which is connected to the valve under test. The other end of the boost control switch is connected to the input terminal of the boost pump. The output terminal of the boost pump is connected to the high-pressure input branch, which is connected to the valve under test.

[0008] Furthermore, a low-pressure relief valve is installed on the delivery pipeline, and a high-pressure relief valve is installed on the high-pressure input branch.

[0009] Furthermore, a pressure sensor is installed on the delivery pipeline.

[0010] Furthermore, there are multiple cryogenic baths, multiple low-pressure input switches are provided on the low-pressure input branch, and multiple high-pressure input switches are provided on the high-pressure input branch. Each cryogenic bath corresponds to one low-pressure input switch and one high-pressure input switch.

[0011] Furthermore, the liquid nitrogen filling system includes a cryogenic storage tank and a liquid nitrogen control valve. The cryogenic storage tank is connected to one end of the liquid nitrogen control valve via a pipeline, and the other end of the liquid nitrogen control valve is connected to the cryogenic bath.

[0012] Furthermore, the leakage detection system includes a flow meter, a leakage detection pipeline, and a leakage detection control valve. One end of the leakage detection pipeline is disposed in the mounting pit, and the other end of the leakage detection pipeline is connected to one end of the leakage detection control valve, and the other end of the leakage detection control valve is connected to the flow meter.

[0013] Furthermore, the temperature detection system includes a valve body temperature sensor, a packing temperature sensor, a switching element temperature sensor, a refrigerant temperature sensor, and a temperature sensor junction box. The valve body temperature sensor, packing temperature sensor, switching element temperature sensor, and refrigerant temperature sensor are all connected to the temperature sensor junction box, which is located on the side of the low-temperature tank.

[0014] Furthermore, the ventilation system includes a first blower, a second blower, and a third blower, wherein the first blower is horizontally disposed at the bottom of the mounting pit, and the second and third blowers are vertically disposed at the top of the mounting pit.

[0015] Furthermore, it also includes a control room, which is located next to the test room. The control room is equipped with a PLC control system, which is connected to the ventilation system, leakage detection system, temperature detection system, liquid nitrogen filling system, and high-pressure gas delivery system.

[0016] The beneficial effects of this utility model are as follows: This utility model enables remote testing of cryogenic valves through a cryogenic bath, liquid nitrogen filling system, temperature detection system, and high-pressure gas delivery system, which greatly improves the testing efficiency of cryogenic valves and ensures the safety of testing personnel. The ventilation system and leakage detection system monitor and ventilate the test site environment to ensure the safety of testing personnel during valve disassembly and assembly. Attached Figure Description

[0017] Figure 1 This is a plan view of the present invention.

[0018] Figure 2 This is a structural schematic diagram of one embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the system connection of one embodiment of the present invention. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. The described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0021] In the technical solution of this utility model, Figure 1 This is a structural diagram provided based on the specific structure of this utility model, such as... Figure 1 As shown, this utility model specifically includes: a test room 8, an installation pit 10 is provided on the ground of the test room 8, a low temperature tank 1, a ventilation system 6 and a leakage detection system 4 are provided in the installation pit 10, the low temperature tank 1 is connected to a liquid nitrogen filling system 3, a temperature detection system 5 is provided in the low temperature tank 1, and the valve to be tested is placed in the low temperature tank 1 and connected to a high pressure gas delivery system 2.

[0022] In one embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the high-pressure gas delivery system 2 includes: a test gas source 21, a pressure reducer 22, a delivery pipeline 23, a low-pressure control switch 24, a pressure boosting control switch 27, a booster pump 28, a low-pressure input branch, and a high-pressure input branch;

[0023] The test gas source 21 is connected to the input end of the pressure reducer 22. The output end of the pressure reducer 22 is connected to one end of the low-pressure control switch 24 and one end of the boost control switch 27 via the delivery pipeline 23. The other end of the low-pressure control switch 24 is connected to the low-pressure input branch, which is connected to the valve under test. The other end of the boost control switch 27 is connected to the input end of the boost pump 28. The output end of the boost pump 28 is connected to the high-pressure input branch, which is connected to the valve under test.

[0024] The test gas source 21 includes nitrogen or helium; nitrogen is selected when the temperature is greater than or equal to -110℃, and helium is selected when the temperature is below -110℃. The pressure reducer 22 is connected to the outlet of the test gas source 21 and can adjust the test gas source 21 within the range of 0-55 bar. The booster pump 28 is responsible for pressurizing the test gas, and can pressurize the gas to 25 MPa. The start / stop signal of the booster pump 28 is introduced into the control system of the control room 7, allowing the start and stop of the booster pump 28 to be controlled in the control room 7. The low-pressure control switch 24 consists of a high-pressure pneumatic control valve and a solenoid valve; the solenoid valve controls the opening and closing of the pneumatic control valve. The low-pressure control switch 24 is responsible for switching the low-pressure input branch.

[0025] The delivery pipeline 23 is made of 304 stainless steel and can withstand a pressure of 25 MPa. The delivery pipeline 23 is laid in a pit, 1800 mm above the ground, ensuring personnel are kept away from the high-pressure gas. The delivery pipeline 23 is laid next to each cryogenic tank 1 and connected to the test valve during testing. The delivery pipeline 23 is divided into a low-to-medium pressure pipeline (0-55 bar) and a high-pressure pipeline (55-250 bar). The low-to-medium pressure pipeline (0-55 bar) is depressurized by the test gas source 21 via the pressure reducer 22, while the high-pressure pipeline (55-250 bar) is pressurized by the booster pump 28 before delivery. Specifically, the low-pressure input branch is the low-to-medium pressure pipeline (0-55 bar), and the high-pressure input branch is the high-pressure pipeline (55-250 bar).

[0026] Specifically, a low-pressure relief valve 26 is installed on the delivery pipeline 23, and a high-pressure relief valve 211 is installed on the high-pressure input branch. The low-pressure relief valve 26 consists of a high-pressure pneumatic control valve and a solenoid valve, with the solenoid valve controlling the opening and closing of the pneumatic control valve. The relief valve 26 is installed on the delivery pipeline 23 and is responsible for relieving pressure in the delivery pipeline. The high-pressure relief valve 211 consists of a high-pressure pneumatic control valve and a solenoid valve, with the solenoid valve controlling the opening and closing of the pneumatic control valve. The high-pressure relief valve 211 is installed on the high-pressure input branch and is responsible for relieving pressure in the high-pressure input branch.

[0027] Specifically, a pressure sensor 25 is installed on the delivery pipeline 23. The pressure sensor 25 has a range of 0-10 MPa and is installed on the delivery pipeline 23 to measure the pressure of the main pipeline.

[0028] Specifically, there are multiple cryogenic baths 1, multiple low-pressure input switches are installed on the low-pressure input branch, and multiple high-pressure input switches are installed on the high-pressure input branch. Each cryogenic bath 1 corresponds to one low-pressure input switch and one high-pressure input switch. For example... Figure 2 As shown in one embodiment of the present invention, Figure 2It contains five cryogenic baths: Cryogenic Bath A 11; Cryogenic Bath B 12; Cryogenic Bath C 13; Cryogenic Bath D 14; and Cryogenic Bath E 15. Therefore, there are five low-pressure input switches and five high-pressure input switches, each corresponding to one of the five cryogenic baths. Specifically, these are: High-pressure switch A 218, Low-pressure control switch A 219, Low-pressure control switch B 217, High-pressure switch A 218, High-pressure switch C 214, Low-pressure control switch C 215, High-pressure switch D 212, Low-pressure control switch D 213, Low-pressure control switch E 29, and High-pressure switch E 210. Both the low-pressure and high-pressure input switches consist of a high-pressure pneumatic valve and a solenoid valve, respectively controlling the high and low pressure inputs of Cryogenic Bath A 11, Cryogenic Bath B 12, Cryogenic Bath C 13, Dryogenic Bath D 14, and Cryogenic Bath E 15. All switch signals are led to control room 7, where the pipelines are switched and managed.

[0029] In one embodiment of this utility model, the liquid nitrogen filling system 3 includes a cryogenic storage tank 31 and a liquid nitrogen control valve 32. The cryogenic storage tank 31 is connected to one end of the liquid nitrogen control valve 32 via a pipeline, and the other end of the liquid nitrogen control valve 32 is connected to the cryogenic bath 1. The cryogenic storage tank 31 stores liquid nitrogen, and the volume of the cryogenic storage tank 31 is 10m³. 3 Liquid nitrogen can be added to the cryogenic storage tank 31 at fixed intervals to meet the long-term requirements of cryogenic testing without the need for frequent addition of liquid nitrogen.

[0030] In one embodiment of this utility model, the leakage detection system 4 includes a flow meter 41, a leakage detection pipeline 42, and a leakage detection control valve 43. One end of the leakage detection pipeline 42 is disposed in the mounting pit 10, and the other end of the leakage detection pipeline 42 is connected to one end of the leakage detection control valve 43. The other end of the leakage detection control valve 43 is connected to the flow meter. The flow meter 41 has a flow sensor inside, which can detect the real-time leakage of the valve and transmit the signal to the PLC control system. In one embodiment, the flow meter 41 has five interfaces. There are five leakage detection pipelines 42, which are respectively laid next to five different cryogenic tanks 1. There are five leakage detection control valves 43, which can simultaneously measure the leakage of five different valves.

[0031] In one embodiment of this utility model, the temperature detection system 5 includes a valve body temperature sensor 51, a packing temperature sensor 52, a closing element temperature sensor 53, a refrigerant temperature sensor 54, and a temperature sensor junction box 55. The valve body temperature sensor 51, packing temperature sensor 52, closing element temperature sensor 53, and refrigerant temperature sensor 54 are all connected to the temperature sensor junction box 55, which is located on the side of the cryogenic bath 1. All sensors are placed at designated positions on the valve under test according to standard cryogenic valve testing standards, specifically GB / T 24925 "Cryogenic Valves," for monitoring the temperature of the valve under test. The temperature sensor junction box 55 is installed next to the cryogenic bath 1 to facilitate the wiring of the temperature sensor signal lines. The temperature sensor junction box 55 is connected to the temperature sensors using aviation plugs for easy disassembly.

[0032] In one embodiment of this utility model, the ventilation system 6 includes a first blower 61, a second blower 62, and a third blower 63. The first blower 61 is horizontally installed at the bottom of the mounting pit 10, while the second blower 62 and the third blower 63 are vertically installed at the top of the mounting pit 10. The first blower 61 is installed horizontally in the pit with its blades facing upwards. The second blower 62 and the third blower 63 are installed vertically on the ground with their blades horizontal. When the ventilation system 6 is in operation, the first blower 61 blows the sinking nitrogen upwards, and the second blower 62 and the third blower 63 then blow the nitrogen outwards, ensuring personnel safety and avoiding the risk of nitrogen asphyxiation.

[0033] In one embodiment of this utility model, a control room 7 is further included. The control room 7 is located next to the test room 8. A PLC control system 9 is installed in the control room 7. The PLC control system 9 is connected to the ventilation system 6, the leakage detection system 4, the temperature detection system 5, the liquid nitrogen filling system 3, and the high-pressure gas delivery system 2, respectively. The specific connection methods are as follows: Figure 3 As shown in the diagram, solid lines represent gas pipes, and dashed lines represent signal lines. The control room 7 is constructed of explosion-proof walls and explosion-proof glass. It is equipped with a computer connected to a PLC control system. The computer contains control software and monitoring facilities for operating the PLC control system. In the cryogenic laboratory, personnel only need to operate within control room 7, remaining away from the site to ensure operator safety. It should be noted that the PLC control system includes a PLC controller, and its control method is a conventional technique in this field, therefore it will not be described in detail here.

[0034] Using the above system, during low-temperature testing, the valve to be tested is placed in the low-temperature tank 1. Liquid nitrogen is delivered to the low-temperature tank 1 through the liquid nitrogen filling system 3. The ventilation system 6 is activated during the test to ventilate the test environment. Once the valve reaches the test temperature, personnel in the control room 7 automatically deliver the test gas to the valve through the high-pressure gas delivery system 2 via the PLC control system. When testing is required, the leakage detection system 4 detects the leakage of the valve. This patent achieves remote testing of low-temperature valves through a series of automated controls, greatly improving the testing efficiency of low-temperature valves and ensuring the safety of testing personnel.

[0035] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A cryogenic valve explosion-proof testing system, comprising: The utility model relates to a kind of low-temperature leakage test device for valve, including: Test room (8), the ground of the test room (8) is provided with installation pit (10), low-temperature tank (1) is provided in the installation pit (10), ventilation system (6) and leakage amount detection system (4) are provided, the low-temperature tank (1) is connected with liquid nitrogen filling system (3), temperature detection system (5) is provided in the low-temperature tank (1), the valve to be measured is placed in the low-temperature tank (1) and is communicated with high-pressure gas delivery system (2).

2. The cryogenic valve explosion-proof testing system of claim 1, wherein, The high-pressure gas delivery system (2) includes: test gas source (21), pressure reducer (22), delivery pipeline (23), low-pressure control switch (24), pressure increasing control switch (27), pressure increasing pump (28), low-pressure input branch and high-pressure input branch; The test gas source (21) is connected with the input end of pressure reducer (22), the output end of pressure reducer (22) is connected with one end of low-pressure control switch (24) and one end of pressure increasing control switch (27) through delivery pipeline (23), the other end of low-pressure control switch (24) is connected with low-pressure input branch, the low-pressure input branch is connected with the valve to be measured, the other end of pressure increasing control switch (27) is connected with the input end of pressure increasing pump (28), the output end of pressure increasing pump (28) is connected with high-pressure input branch, and the high-pressure input branch is connected with the valve to be measured.

3. The cryogenic valve explosion-proof testing system of claim 2, wherein, Low-pressure pressure relief valve (26) is provided on the delivery pipeline (23), and high-pressure pressure relief valve (211) is provided on the high-pressure input branch.

4. The cryogenic valve explosion-proof testing system of claim 2, wherein, Pressure sensor (25) is provided on the delivery pipeline (23).

5. The cryogenic valve explosion-proof testing system of claim 2, wherein, The number of the low-temperature tank (1) is multiple, a plurality of low-pressure input switches are provided on the low-pressure input branch, and a plurality of high-pressure input switches are provided on the high-pressure input branch, and each low-temperature tank (1) corresponds to a low-pressure input switch and a high-pressure input switch.

6. The cryogenic valve explosion-proof testing system of claim 1, wherein, The liquid nitrogen filling system (3) includes low-temperature liquid storage tank (31) and liquid nitrogen control valve (32), the low-temperature liquid storage tank (31) is connected with one end of the liquid nitrogen control valve (32) through pipeline, and the other end of the liquid nitrogen control valve (32) is connected with the low-temperature tank (1).

7. The cryogenic valve explosion-proof testing system of claim 1, wherein, The leakage amount detection system (4) includes flowmeter (41), leakage amount detection pipeline (42) and leakage amount detection control valve (43), one end of the leakage amount detection pipeline (42) is arranged in the installation pit (10), the other end of the leakage amount detection pipeline (42) is connected with one end of the leakage amount detection control valve (43), and the other end of the leakage amount detection control valve (43) is connected with the flowmeter.

8. The cryogenic valve explosion-proof testing system of claim 1, wherein, The temperature detection system (5) includes valve body temperature sensor (51), packing temperature sensor (52), opening and closing part temperature sensor (53), refrigerant temperature sensor (54) and temperature sensor terminal box (55), the valve body temperature sensor (51), packing temperature sensor (52), opening and closing part temperature sensor (53), refrigerant temperature sensor (54) are connected with the temperature sensor terminal box (55), and the temperature sensor terminal box (55) is arranged at the side of the low-temperature tank (1).

9. The cryogenic valve explosion-proof testing system of claim 1, wherein, The ventilation system (6) comprises a first air blower (61), a second air blower (62) and a third air blower (63), the first air blower (61) is horizontally arranged at the bottom of the installation pit (10), and the second air blower (62) and the third air blower (63) are vertically arranged at the top of the installation pit (10).

10. The cryogenic valve explosion-proof testing system of claim 1, wherein, Further comprising a control room (7) arranged at the partition wall of the test room (8), a PLC control system (9) is arranged in the control room (7), and the PLC control system (9) is connected with the ventilation system (6), the leakage amount detection system (4), the temperature detection system (5), the liquid nitrogen filling system (3) and the high-pressure gas conveying system (2) respectively.

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