System and method for testing performance of low-temperature liquid one-way valve

Abstract

The invention provides a performance test system for a low-temperature liquid one-way valve, and particularly relates to the field of low-temperature equipment. The performance test system for the low-temperature liquid one-way valve is characterized in that the outlet end of a high-pressure gas storage tank sequentially penetrates through a cold box and a test platform liquid pool; the first heat exchanger and the to-be-tested low-temperature one-way valve are sequentially connected in a liquid pool of the test platform, and finally the to-be-tested low-temperature one-way valve sequentially penetrates through the test platform and the cold box from the outlet end of the to-be-tested low-temperature one-way valve and is connected with the first exhaust treatment device, and the inlet end of the helium mass spectrometer leak detector is connected to the outlet end of the high-pressure gas storage tank. The outlet end of the helium tank is connected to the outlet end of the low-temperature one-way valve to be tested, and testing of the opening pressure difference, the closing pressure difference, the flow characteristic and the sealing performance of the one-way valve at the low temperature can be achieved.

Description

Technical Field

[0001] The present invention relates to the field of cryogenic equipment, and in particular to a system and method for testing the performance of a cryogenic liquid one-way valve. Background Art

[0002] Liquid hydrogen is one of the important forms of hydrogen energy utilization. Liquid hydrogen plants usually reduce gaseous hydrogen to 20K for liquefaction, and transport it to liquid hydrogen tank trucks through low-temperature transmission pipelines. The liquid hydrogen is then transported to hydrogen refueling stations using liquid hydrogen tank trucks, and hydrogen fuel is refilled into terminal equipment at hydrogen refueling stations. Liquid hydrogen storage and gas hydrogen refueling hydrogen refueling stations usually use liquid hydrogen to increase the pressure of 1-3 bar liquid hydrogen out of the tank to the pressure required for refueling, and then after vaporization and rewarming, the temperature and pressure required for refueling are adjusted.

[0003] Liquid hydrogen storage and refueling stations usually use liquid hydrogen refueling guns to refuel liquid hydrogen from the hydrogen refueling station to the liquid hydrogen storage tanks on liquid hydrogen heavy trucks. The low-temperature one-way valve is an indispensable key component. The current design and test of the one-way valve uses room temperature water or air as the medium, but the valve seat and valve core size of the one-way valve shrink at low temperatures, and the elastic modulus, self-length and other parameters of the spring change. Its opening pressure, closing pressure, sealing performance and other parameters will deviate from the design values ​​and normal temperature test values ​​at low temperatures.

[0004] Therefore, it is necessary to propose a system and method that can realize testing of a one-way valve in a low temperature environment. Summary of the invention

[0005] In order to solve the above-mentioned problem, the present invention provides a system and method for testing the performance of a cryogenic liquid one-way valve.

[0006] The present invention is achieved through the following technical solutions:

[0007] The present invention provides a low-temperature liquid one-way valve performance test system comprising a test unit and a supply unit, wherein:

[0008] The test unit includes a cold box, a first heat exchanger, a test platform liquid pool, a helium mass spectrometer leak detector and a helium cylinder, the first heat exchanger is arranged inside the test platform liquid pool, and the test platform liquid pool is arranged inside the cold box;

[0009] The supply unit includes a cryogenic liquid storage tank, a high-pressure gas storage tank and a first exhaust gas treatment device;

[0010] The outlet end of the cryogenic liquid storage tank passes through the cold box and is connected to the test platform liquid pool; the outlet end of the high-pressure gas storage tank passes through the cold box and the test platform liquid pool in sequence, and is connected to the first heat exchanger and the low-temperature one-way valve to be tested in sequence in the test platform liquid pool; finally, the outlet end of the low-temperature one-way valve to be tested passes through the test platform and the cold box in sequence and is connected to the first exhaust treatment device; the inlet end of the helium mass spectrometer leak detector is connected to the outlet end of the high-pressure gas storage tank, and the outlet end of the helium bottle is connected to the outlet end of the low-temperature one-way valve to be tested.

[0011] Furthermore, the test unit also includes a second exhaust gas treatment device, which passes through the cold box and is connected to the test platform liquid pool.

[0012] Furthermore, the test unit also includes a plurality of thermometers and pressure gauges, and the plurality of thermometers are respectively arranged between the first heat exchanger and the low-temperature one-way valve to be tested, at the inlet end of the first heat exchanger and at the outlet end of the low-temperature one-way valve to be tested.

[0013] Furthermore, the supply unit further includes a first outlet valve and a second outlet valve, wherein the first outlet valve is disposed at the outlet end of the cryogenic liquid storage tank, and the second outlet valve is disposed at the outlet end of the high-pressure gas storage tank.

[0014] Furthermore, the test unit also includes a second heat exchanger, and the second heat exchanger is arranged between the low-temperature one-way valve to be tested and the first exhaust treatment device.

[0015] Furthermore, it also includes a flow meter, which is arranged between the second heat exchanger and the first exhaust treatment device.

[0016] Furthermore, it also includes a third outlet valve, which is arranged on the inlet end of the first exhaust treatment device.

[0017] Furthermore, the test unit further comprises a fourth outlet valve and a fifth outlet valve, wherein the fourth outlet valve is arranged on the inlet end of the helium gas bottle, and the fifth outlet valve is arranged on the inlet end of the helium mass spectrometer leak detector.

[0018] Furthermore, a method for testing the performance of a cryogenic liquid one-way valve includes a pressure differential flow characteristic test, wherein the pressure differential flow characteristic test includes the following steps:

[0019] S1. Open the first outlet valve and pass the cryogenic fluid in the cryogenic liquid storage tank into the liquid pool of the test platform until the first heat exchanger and the cryogenic one-way valve to be tested are immersed;

[0020] S2. Close the fourth outlet valve and the fifth outlet valve, and open the third outlet valve and the second outlet valve;

[0021] S3. Gradually increase the inlet pressure of the low-temperature one-way valve to be tested, record the flow value of the flow meter, test the opening pressure of the low-temperature one-way valve to be tested, and test the flow performance of the low-temperature one-way valve to be tested after stabilization;

[0022] S4. Gradually reduce the inlet pressure of the low-temperature one-way valve to be tested, record the flow value of the flow meter, and test the closing pressure of the low-temperature one-way valve to be tested.

[0023] Furthermore, a low temperature sealing performance test is also included, and the low temperature sealing performance test includes the following steps:

[0024] S5. Close the second outlet valve, and after the gas is discharged, close the third outlet valve;

[0025] S6. Open the fourth outlet valve, fill helium into the low-temperature one-way valve to be tested, and open the fifth outlet valve;

[0026] S7. Test the sealing performance of the cryogenic one-way valve under low temperature by using a helium mass spectrometer leak detector.

[0027] Beneficial effects of the present invention:

[0028] The cryogenic liquid one-way valve performance testing system proposed in the present invention can not only realize the testing of the opening pressure difference, closing pressure difference, flow characteristics and sealing performance of the one-way valve under low temperature, but also can test the one-way valve to be tested at liquid nitrogen, liquid hydrogen and liquid helium temperatures by changing the medium in the cryogenic liquid storage tank, thereby providing a one-way valve with accurate performance parameters for equipment working at low temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural diagram of the low-temperature liquid one-way valve performance testing system of the present invention;

[0030] In the figure: cryogenic liquid storage tank 1, thermometer 2, first outlet valve 3, cold box 4, test platform liquid pool 5, first heat exchanger 6, first heat exchanger 7, fourth outlet valve 8, helium bottle 9, cryogenic liquid storage tank 10, second outlet valve 11, pressure gauge 12, second exhaust treatment device 13, second heat exchanger 14, flow meter 15, third outlet valve 16, first exhaust device 17, fifth outlet valve 18, helium mass spectrometer leak detector 19;

[0031] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0032] In order to more clearly and completely illustrate the technical solution of the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0033] Please refer to Figure 1The present invention provides a low-temperature liquid one-way valve performance test system including a test unit and a supply unit, wherein:

[0034] The test unit includes a cold box 4, a first heat exchanger 76, a test platform liquid pool 5, a helium mass spectrometer leak detector 19 and a helium gas bottle 9, the first heat exchanger 76 is arranged inside the test platform liquid pool 5, and the test platform liquid pool 5 is arranged inside the cold box 4;

[0035] The supply unit includes a cryogenic liquid storage tank 101, a high-pressure gas storage tank and a first exhaust gas treatment device;

[0036] The outlet end of the cryogenic liquid storage tank 101 passes through the cold box 4 and is connected to the test platform liquid pool 5. The outlet end of the high-pressure gas storage tank passes through the cold box 4 and the test platform liquid pool 5 in sequence, and is connected to the first heat exchanger 76 and the low-temperature one-way valve to be tested in the test platform liquid pool 5 in sequence. Finally, from the outlet end of the low-temperature one-way valve to be tested, it passes through the test platform and the cold box 4 in sequence and is connected to the first exhaust treatment device. The inlet end of the helium mass spectrometer leak detector 19 is connected to the outlet end of the high-pressure gas storage tank, and the outlet end of the helium bottle 9 is connected to the outlet end of the low-temperature one-way valve to be tested.

[0037] In a specific embodiment, the cryogenic liquid storage tank 101 provides cryogenic liquids such as liquid nitrogen, liquid hydrogen, and liquid helium to the test platform liquid pool 5, the cold box 4 provides a vacuum insulation environment, the test platform liquid pool 5 is filled with cryogenic liquid, the first heat exchanger 76 and the cryogenic one-way valve to be tested are immersed in the cryogenic liquid in the test platform liquid pool 5, the first heat exchanger 76 exchanges heat with the cryogenic liquid in the test platform liquid pool 5 to cool the liquid entering the cryogenic one-way valve to be tested to a set temperature, the helium mass spectrometer leak detector 19 is used to detect helium, the helium cylinder 9 is used to introduce helium into the one-way valve to be tested, and the first exhaust treatment device processes the gas after the test;

[0038] When the pressure flow test is performed on the cryogenic one-way valve to be tested, the cryogenic liquid storage tank 101 first introduces cryogenic liquid into the test platform liquid pool 5 until the liquid level immerses the first heat exchanger 76 and the cryogenic one-way valve to be tested. After cooling, the inlet pressure of the cryogenic one-way valve to be tested is gradually increased through the high-pressure gas storage tank to test the opening pressure of the cryogenic one-way valve to be tested. Then, the closing pressure of the cryogenic one-way valve to be tested is tested by lowering the pressure of the cryogenic one-way valve to be tested, as well as the flow value when opening and closing.

[0039] After the pressure flow test is completed, when the sealing performance test of the cryogenic one-way valve to be tested is carried out, the high-pressure gas storage tank is closed, the gas is discharged, the helium cylinder 9 and the helium mass spectrometer leak detector 19 are opened, and the sealing performance of the cryogenic one-way valve to be tested at low temperature is tested;

[0040] The present invention can not only realize the testing of the opening pressure difference, closing pressure difference, flow characteristics and sealing performance of the one-way valve under low temperature, but also can test the one-way valve to be tested at liquid nitrogen, liquid hydrogen and liquid helium temperatures by changing the medium in the cryogenic liquid storage tank 101, thereby providing a one-way valve with accurate performance parameters for equipment working at low temperatures.

[0041] Furthermore, the test unit further includes a second exhaust gas treatment device 13 , which passes through the cold box 4 and is connected to the test platform liquid pool 5 .

[0042] In a specific implementation, the second exhaust treatment device 13 is used to exhaust the gas that absorbs heat and evaporates in the test platform liquid pool 5 to prevent the gas pressure in the test platform liquid pool 5 from affecting the test.

[0043] Furthermore, the test unit also includes a plurality of thermometers 2 and a pressure gauge 12, and the plurality of thermometers 2 are respectively arranged between the first heat exchanger 76 and the low-temperature one-way valve to be tested, at the inlet end of the first heat exchanger 76 and at the outlet end of the low-temperature one-way valve to be tested.

[0044] In a specific embodiment, multiple thermometers 2 are used to test the temperature of the fluid before passing through the first heat exchanger 76, after passing through the first heat exchanger 76, and after passing through the one-way valve to be tested. The pressure gauge 12 is used to test the fluid pressure before entering the cold box 4 and after leaving the cold box 4. The thermometer 2 and the pressure gauge 12 are used to cooperate with the system to test the performance of the low-temperature one-way valve to be tested.

[0045] Furthermore, the supply unit further includes a first outlet valve 3 and a second outlet valve 11. The first outlet valve 3 is arranged at the outlet end of the cryogenic liquid storage tank 101, and the second outlet valve 11 is arranged at the outlet end of the high-pressure gas storage tank.

[0046] In a specific embodiment, the first outlet valve 3 is used to open and close the cryogenic liquid storage tank 101 to control the flow of cryogenic fluid, and the second outlet valve 11 is used to open and close the high-pressure gas storage tank to control the flow of high-pressure gas.

[0047] Furthermore, the test unit further includes a second heat exchanger 14, and the second heat exchanger 14 is arranged between the low-temperature one-way valve to be tested and the first exhaust treatment device.

[0048] In a specific embodiment, the second heat exchanger 14 is used to restore the tested low-temperature fluid to room temperature. The low-temperature fluid after passing through the low-temperature one-way valve to be tested is recovered through the second heat exchanger 14 for cooling, and finally discharged through the first exhaust treatment device.

[0049] Furthermore, it also includes a flow meter 15, which is arranged between the second heat exchanger 14 and the first exhaust treatment device.

[0050] In a specific implementation, the flow meter 15 is used to test the flow rate of the cryogenic one-way valve to be tested under a given pressure difference at low temperature to evaluate the cryogenic flow performance of the cryogenic one-way valve to be tested.

[0051] Furthermore, it also includes a third outlet valve 16, which is arranged on the inlet end of the first exhaust treatment device.

[0052] In a specific embodiment, the third outlet valve 16 is a normal temperature valve, which is used to control the gas discharge during the low temperature performance test of the low temperature one-way valve to be tested.

[0053] Furthermore, the test unit further comprises a fourth outlet valve 8 and a fifth outlet valve 18 . The fourth outlet valve 8 is arranged on the inlet end of the helium gas bottle 9 , and the fifth outlet valve 18 is arranged on the inlet end of the helium mass spectrometer leak detector 19 .

[0054] In a specific embodiment, the fourth outlet valve 8 is used to control the opening and closing of the outlet of the helium cylinder 9, and the fifth outlet valve 18 is used to control the opening and closing of the inlet of the helium mass spectrometer leak detector 19. When the airtightness test is performed on the cryogenic one-way valve to be tested, the fourth outlet valve 8 and the fifth outlet valve 18 are opened, and the helium cylinder 9 is used to reversely introduce helium into the cryogenic one-way valve to be tested, and the helium is detected by the helium mass spectrometer leak detector 19 to test the airtightness of the cryogenic one-way valve to be tested.

[0055] Furthermore, a method for testing the performance of a cryogenic liquid one-way valve includes a pressure differential flow characteristic test, and the pressure differential flow characteristic test includes the following steps:

[0056] S1. Open the first outlet valve 3 and pass the cryogenic fluid in the cryogenic liquid storage tank 101 into the test platform liquid pool 5 until the first heat exchanger 76 and the cryogenic one-way valve to be tested are immersed;

[0057] S2. Close the fourth outlet valve 8 and the fifth outlet valve 18, and open the third outlet valve 16 and the second outlet valve 11;

[0058] S3 gradually increase the inlet pressure of the low-temperature check valve to be tested, record the flow value of the flow meter 15, test the opening pressure of the low-temperature check valve to be tested, and test the flow performance of the low-temperature check valve to be tested after stabilization;

[0059] S4. Gradually reduce the inlet pressure of the low-temperature one-way valve to be tested, record the flow value of the flow meter 15, and test the closing pressure of the low-temperature one-way valve to be tested.

[0060] Furthermore, a low temperature sealing performance test is also included, and the low temperature sealing performance test includes the following steps:

[0061] S5. Close the second outlet valve 11, and after the gas is discharged, close the third outlet valve 16;

[0062] S6. Open the fourth outlet valve 8, fill the helium into the low-temperature one-way valve to be tested, and open the fifth outlet valve 18;

[0063] S7. Testing the sealing performance of the cryogenic one-way valve to be tested at low temperature by using a helium mass spectrometer leak detector 19.

[0064] In a specific embodiment, during the pressure differential flow characteristic test, the first heat exchanger 76 cools the inlet fluid of the low-temperature one-way valve to be tested to a set temperature through the test platform liquid pool 5, while the second heat exchanger 14 restores the fluid flowing through the low-temperature one-way valve to be tested to room temperature. The low-temperature liquid storage tank 101 is sequentially connected to the first heat exchanger 76, the low-temperature one-way valve to be tested, the second heat exchanger 14 and the first exhaust device 17 to form a pressure differential flow characteristic test branch, and the helium cylinder 9 is sequentially connected to the low-temperature one-way valve to be tested, the first heat exchanger 76, and the helium mass spectrometer leak detector 19 to form a low-temperature sealing performance test branch.

[0065] Of course, the present invention may have many other implementations. Based on this implementation, other implementations obtained by ordinary technicians in this field without any creative work are all within the scope of protection of the present invention.

Claims

1. A cryogenic liquid one-way valve performance test system, characterized in that: It includes a test unit and a supply unit, wherein: The test unit includes a cold box, a first heat exchanger, a test platform liquid pool, a helium mass spectrometer leak detector and a helium cylinder, the first heat exchanger is arranged inside the test platform liquid pool, and the test platform liquid pool is arranged inside the cold box; The supply unit includes a cryogenic liquid storage tank, a high-pressure gas storage tank and a first exhaust gas treatment device; The outlet end of the cryogenic liquid storage tank passes through the cold box and is connected to the test platform liquid pool; the outlet end of the high-pressure gas storage tank passes through the cold box and the test platform liquid pool in sequence, and is connected to the first heat exchanger and the low-temperature one-way valve to be tested in sequence in the test platform liquid pool; finally, the outlet end of the low-temperature one-way valve to be tested passes through the test platform and the cold box in sequence and is connected to the first exhaust treatment device; the inlet end of the helium mass spectrometer leak detector is connected to the outlet end of the high-pressure gas storage tank, and the outlet end of the helium bottle is connected to the outlet end of the low-temperature one-way valve to be tested.

2. The cryogenic liquid one-way valve performance test system according to claim 1, characterized in that: The test unit further includes a second exhaust gas treatment device, which passes through the cold box and is connected to the test platform liquid pool.

3. The cryogenic liquid one-way valve performance testing system according to claim 1, characterized in that: The test unit further includes a plurality of thermometers and pressure gauges, wherein the plurality of thermometers are respectively arranged between the first heat exchanger and the low-temperature one-way valve to be tested, at the inlet end of the first heat exchanger and at the outlet end of the low-temperature one-way valve to be tested.

4. The cryogenic liquid one-way valve performance testing system according to claim 1, characterized in that: The supply unit further includes a first outlet valve and a second outlet valve, wherein the first outlet valve is disposed at an outlet end of the cryogenic liquid storage tank, and the second outlet valve is disposed at an outlet end of the high-pressure gas storage tank.

5. The cryogenic liquid one-way valve performance testing system according to claim 1, characterized in that: The test unit further includes a second heat exchanger, which is disposed between the low-temperature one-way valve to be tested and the first exhaust treatment device.

6. The cryogenic liquid one-way valve performance testing system according to claim 5, characterized in that: The system also includes a flow meter, which is disposed between the second heat exchanger and the first exhaust treatment device.

7. The cryogenic liquid one-way valve performance testing system according to claim 6, characterized in that: The exhaust gas treatment device further includes a third outlet valve, wherein the third outlet valve is disposed on an inlet end of the first exhaust gas treatment device.

8. The cryogenic liquid one-way valve performance testing system according to claim 1, characterized in that: The test unit further comprises a fourth outlet valve and a fifth outlet valve, wherein the fourth outlet valve is arranged on the inlet end of the helium gas bottle, and the fifth outlet valve is arranged on the inlet end of the helium mass spectrometer leak detector.

9. A method for testing the performance of a cryogenic liquid one-way valve, using the cryogenic liquid one-way valve performance testing system according to any one of claims 1 to 8, characterized in that: The method comprises a pressure differential flow characteristic test, wherein the pressure differential flow characteristic test comprises the following steps: S1. Open the first outlet valve and pass the cryogenic fluid in the cryogenic liquid storage tank into the test platform liquid pool until the first heat exchanger and the cryogenic one-way valve to be tested are immersed; S2. Close the fourth outlet valve and the fifth outlet valve, and open the third outlet valve and the second outlet valve; S3. Gradually increase the inlet pressure of the low-temperature one-way valve to be tested, record the flow value of the flow meter, test the opening pressure of the low-temperature one-way valve to be tested, and test the flow performance of the low-temperature one-way valve to be tested after stabilization; S4. Gradually reduce the inlet pressure of the cryogenic one-way valve to be tested, record the flow value of the flow meter, and test the closing pressure of the cryogenic one-way valve to be tested.

10. The method for testing the performance of a cryogenic liquid one-way valve according to claim 9, characterized in that: It also includes a low temperature sealing performance test, which includes the following steps: S5. Close the second outlet valve, and after the gas is discharged, close the third outlet valve; S6. Open the fourth outlet valve, fill helium into the low-temperature one-way valve to be tested, and open the fifth outlet valve; S7. Test the sealing performance of the cryogenic one-way valve under low temperature by using a helium mass spectrometer leak detector.

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