Liquid hydrogen piston pump static labyrinth sealing performance test system

Abstract

The utility model provides a liquid hydrogen piston pump static labyrinth sealing performance testing system, and particularly relates to the technical field of low-temperature equipment detection, the liquid hydrogen piston pump static labyrinth sealing performance testing system is characterized in that a labyrinth sealing cavity is processed in a sealing testing device, liquid hydrogen enters a sealing flow channel after passing through a front cavity body, and the liquid hydrogen enters the sealing flow channel after passing through a rear cavity body; then the low-temperature liquid hydrogen passes through the rear cavity, part of the low-temperature liquid hydrogen is converted into low-temperature hydrogen, the sealing performance test can be completed by measuring the parameters of the low-temperature hydrogen, and at the moment, the sealing flow channel is equivalent to a small part of the piston labyrinth on the circumference; and the test of the labyrinth seal between the piston and the air cylinder with a complete structure can be replaced, so that the cost is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of low-temperature equipment detection, in particular to a liquid hydrogen piston pump static labyrinth sealing performance testing system. Background Art

[0002] Liquid hydrogen, as a renewable, high calorific value, pollution-free, ultra-low temperature liquid clean fuel, is one of the future energy development directions and an effective substitute for traditional fossil energy. It has great application prospects. Existing hydrogen-powered vehicles use hydrogen refueling stations instead of gas stations and use liquid hydrogen as a low-energy, low-cost hydrogen energy storage method. This will become a future development trend. As one of the core components of the liquid hydrogen refueling station system, the liquid hydrogen piston pump has the advantages of low investment, low power consumption, and large flow.

[0003] Since the sealing effect between the cylinder and the back pressure chamber in the piston pump will greatly affect the efficiency of the pump, it is very necessary to study the piston pump seal. For liquid hydrogen, which is an easily vaporized working fluid, reducing the heat generated during piston movement plays an important role in maintaining a low gas content in the cylinder and improving operating efficiency. Therefore, quantitatively measuring the leakage of liquid hydrogen through the piston labyrinth seal flow channel provides direction and data support for improving the mechanical structure of the seal between the piston and cylinder.

[0004] At present, the static leakage measurement device of the piston labyrinth seal can generally only work at ambient temperature or as low as liquid nitrogen (-196℃), and there is little mention of the leakage measurement of the piston labyrinth seal working in the liquid hydrogen (-253℃) or even liquid helium (-269℃) temperature zone. Application No. CN202211452229.X proposes a static sealing performance test system for a complete structure piston and cylinder in the low temperature zone, which can realize the testing and performance evaluation of the sealing performance between various types of pistons and cylinders under different incoming flow pressures in the low temperature zone. However, the cost of establishing a test system for the labyrinth seal between a complete structure piston and cylinder that meets all working conditions is high, the system flow is large, and the system construction is relatively complex.

[0005] In view of this, the utility model provides a testing system capable of intercepting a small section on the circumference of a piston labyrinth seal for testing. Utility Model Content

[0006] In order to solve the problem of high cost of existing testing systems, the utility model proposes a liquid hydrogen piston pump static labyrinth seal performance testing system.

[0007] The utility model is achieved through the following technical solutions:

[0008] The utility model proposes a liquid hydrogen piston pump static labyrinth seal performance test system including a low-temperature test end assembly, wherein:

[0009] The low-temperature test end assembly includes a test tank and a flange sealing cover, wherein the flange sealing cover is disposed on the test tank and is sealedly connected to the test tank, and at least one sealing test device is disposed on the flange sealing cover, wherein a mounting hole is provided on the flange sealing cover, a fixing flange is disposed in the mounting hole, and the sealing test device is fixed to the flange sealing cover via the fixing flange;

[0010] The sealing test device includes a cylinder wall assembly and a piston wall assembly, which are tightly and sealingly connected to form the sealing test device. The sealing test device is processed with a rear cavity at the top, a front cavity at the bottom and a sealing flow channel, and the rear cavity and the front cavity are connected through a sealing flow channel.

[0011] Furthermore, the low-temperature test end assembly also includes a first pipeline and a first stop valve. The first pipeline is connected to the bottom of the sealing test device and communicates with the front cavity. The first stop valve is arranged on the first pipeline.

[0012] Furthermore, the low-temperature test end assembly also includes a second pipeline, which is arranged on the top of the flange sealing cover and connected to the interior of the test tank. The ends of the second pipeline are respectively provided with a first thermometer, a first pressure gauge and a liquid hydrogen level gauge.

[0013] Furthermore, it also includes a delivery end component, which includes a third pipeline and a liquid hydrogen storage tank. One end of the third pipeline is connected to the interior of the test tank, and the other end is connected to the liquid hydrogen storage tank.

[0014] Furthermore, a second pressure gauge and a second shut-off valve are also provided on the third pipeline, and the liquid hydrogen storage tank is sequentially connected to the second shut-off valve, the second pressure gauge and the test storage tank through the third pipeline.

[0015] Furthermore, the delivery end assembly also includes a hydrogen storage tank and a fourth pipeline, one end of the fourth pipeline is connected to the interior of the test tank, and the other end is connected to the hydrogen storage tank.

[0016] Furthermore, the fourth pipeline is also provided with a third pressure gauge, a third stop valve and a pressure reducing valve, and the hydrogen storage tank is sequentially connected to the third stop valve, the pressure reducing valve, the third pressure gauge and the hydrogen storage tank through the fourth pipeline.

[0017] Furthermore, it also includes a recovery end component, which includes a hydrogen recovery tank and a fifth pipeline. A branch at one end of the fifth pipeline is connected to the sixth pipeline and the top of the sealing test device in sequence and is connected to the rear cavity. Another branch is connected to the seventh pipeline, the pressure relief valve and the inside of the test tank in sequence, and the other end is connected to the hydrogen recovery tank.

[0018] Furthermore, the recovery end component also includes a reheater, and the reheater is arranged on the fifth pipeline.

[0019] Furthermore, the fifth pipeline is also provided with a fourth shut-off valve, a flow meter, a second thermometer and a fourth pressure gauge, and the hydrogen recovery tank is sequentially connected to the fourth shut-off valve, the flow meter, the second thermometer, the fourth pressure gauge and the rewarmer through the fifth pipeline.

[0020] Beneficial effects of the utility model:

[0021] (1) The static labyrinth seal performance test system for liquid hydrogen piston pump proposed in the present invention utilizes a labyrinth seal cavity machined in a sealing test device. After the liquid hydrogen passes through the front cavity, it enters the sealing flow channel and then passes through the rear cavity. Part of the low-temperature liquid hydrogen is converted into low-temperature hydrogen gas. The sealing performance test can be completed by measuring the parameters of the low-temperature hydrogen gas. At this time, the sealing flow channel is equivalent to a small part of the piston labyrinth on the circumference. By testing the sealing test device, it can replace the test of the labyrinth seal between the piston and cylinder of the complete structure, which makes the cost lower.

[0022] (2) The liquid hydrogen piston pump static labyrinth sealing performance test system proposed in the present invention utilizes a sealing test device instead of a piston labyrinth for testing, and thus the cylinder wall assembly and the piston wall assembly can be replaced to achieve different piston labyrinth tests.

[0023] (3) The static labyrinth seal performance test system for a liquid hydrogen piston pump proposed in the present invention can be achieved by setting two or more sealing test devices on the flange sealing cover, and measuring the leakage of liquid hydrogen through the labyrinth seal flow channel at a pressure of 0.1-1.5 MPa and a temperature of 20-33 K for each sealing test device. This can effectively evaluate the solvent efficiency loss of the liquid hydrogen piston pump, complete the comparison of the leakage of different piston labies, and select a suitable piston labyrinth. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of the static labyrinth seal performance test system for a liquid hydrogen piston pump of the present utility model;

[0025] Figure 2 This is a structural diagram of the sealing test assembly of the liquid hydrogen piston pump static labyrinth sealing performance test system of the present utility model;

[0026] Figure 3 This is a diagram of an embodiment of a liquid hydrogen piston pump static labyrinth seal performance test system of the present utility model;

[0027] In the figure: low-temperature test end assembly 1, test storage tank 11, flange sealing cover 12, mounting hole 121, sealing test device 13, first pipeline 14, first stop valve 5, second pipeline 16, liquid hydrogen level gauge 18, first pressure gauge 19, first thermometer 110, delivery end assembly 2, liquid hydrogen storage tank 21, second stop valve 22, second pressure gauge 23, third pipeline 24, hydrogen storage tank 25, third stop valve 26, pressure reducing valve 27, third pressure gauge 28, fourth pipeline 29, recovery end assembly 3, fifth pipeline 31, rewarmer 32, fourth pressure gauge 33, second thermometer 34, flowmeter 35, fourth stop valve 36, hydrogen recovery tank 37, seventh pipeline 38, sixth pipeline 39, pressure relief valve 310;

[0028] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0029] In order to more clearly and completely illustrate the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings.

[0030] Please refer to Figure 1-Figure 3 The present invention proposes a liquid hydrogen piston pump static labyrinth seal performance test system including a low-temperature test end assembly 1, wherein:

[0031] The low-temperature test end assembly 1 includes a test tank 11 and a flange sealing cover 12. The flange sealing cover 12 is arranged on the test tank 11 and is sealed to the test tank 11. At least one sealing test device 13 is provided on the flange sealing cover 12. The flange sealing cover 12 is provided with a mounting hole 121. A fixing flange is provided in the mounting hole 121. The sealing test device 13 is fixed to the flange sealing cover 12 via the fixing flange.

[0032] The sealing test device 13 includes a cylinder wall assembly and a piston wall assembly. The cylinder wall assembly and the piston wall assembly are sealed and connected to form the sealing test device 13. The sealing test device 13 is processed with a top rear cavity, a bottom front cavity and a sealing flow channel. The rear cavity and the front cavity are connected through the sealing flow channel.

[0033] In a specific embodiment, the piston wall assembly and the cylinder wall assembly are connected by multiple sets of bolts, and the contact surfaces of the two assemblies are provided with gaskets or sealing rings to ensure airtightness. The test tank 11 and the flange sealing cover 12 are used to provide a sealed space for the sealing test device 13. The sealing test device 13 includes a cylinder wall assembly and a piston wall assembly. The sealing test device 13 is connected to the fixed flange through a thread or a pin. A labyrinth sealing cavity (i.e., a front cavity, a rear cavity, and a sealing flow channel) is machined in the sealing test device 13. The cylinder wall Both the face assembly and the piston wall assembly are provided with a rear cavity, a front cavity and a sealing flow channel connecting the rear cavity and the front cavity. After the liquid hydrogen passes through the front cavity, it enters the sealing flow channel and then passes through the rear cavity. Part of the low-temperature liquid hydrogen is converted into low-temperature hydrogen. The sealing performance test can be completed by measuring the parameters of the low-temperature hydrogen. At this time, the sealing flow channel is equivalent to a small part of the piston maze on the circumference. By testing the sealing test device 13, it can replace the test of the labyrinth seal between the piston and cylinder to achieve a complete structure, which makes the cost lower.

[0034] In one embodiment, the test tank 11 can be a vertical, horizontal or spherical tank, and is kept cold by using a high vacuum multi-layer insulation method. The inner shell of the test tank 11 is wrapped with a multi-layer insulation material, and a vacuum is drawn between the inner layers, with a vacuum degree better than 10 -4 Pa, the test tank 11 and the flange sealing cover 12 are sealed by bolts and O-rings.

[0035] Furthermore, the low-temperature test end assembly 1 also includes a first pipeline 14 and a first stop valve 5 . The first pipeline 14 is connected to the bottom of the sealing test device 13 and communicates with the front cavity. The first stop valve 5 is arranged on the first pipeline 14 .

[0036] In a specific embodiment, the first pipeline 14 is used to transport liquid hydrogen to the sealing test device 13, and the first stop valve 5 controls the on and off of the first pipeline 14. After the first stop valve 5 is opened, the liquid hydrogen in the test tank 11 enters the test device through the first pipeline 14, so as to facilitate the subsequent measurement of the piston maze in the sealing flow channel.

[0037] Furthermore, the low-temperature test end assembly 1 also includes a second pipeline 16, which is arranged on the top of the flange sealing cover 12 and is connected to the interior of the test tank 11. The ends of the second pipeline 16 are respectively provided with a first thermometer 110, a first pressure gauge 19 and a liquid hydrogen level gauge 18.

[0038] In a specific embodiment, the second pipeline 16 is used to connect the first thermometer 110, the first pressure gauge 19 and the liquid hydrogen level gauge 18 to the test storage tank 11. The first thermometer 110, the first pressure gauge 19 and the liquid hydrogen level gauge 18 on the second pipeline 16 respectively measure the temperature, pressure and liquid level of the liquid hydrogen in the test storage tank 11 to monitor the liquid hydrogen in the test storage tank 11 in real time.

[0039] Furthermore, it also includes a delivery end component 2, which includes a third pipeline 24 and a liquid hydrogen storage tank 21. One end of the third pipeline 24 is connected to the interior of the test tank 11, and the other end is connected to the liquid hydrogen storage tank 21.

[0040] In a specific embodiment, the liquid hydrogen storage tank 21 is kept cold using a high vacuum multi-layer insulation method. Multiple layers of insulation material are wrapped around the outside of the inner liner of the liquid hydrogen storage tank 21, and a vacuum is drawn between the inner and outer layers. The liquid hydrogen storage tank 21 is filled with and replenished with liquid hydrogen in the test tank 11 through the third pipeline 24 for subsequent testing.

[0041] Furthermore, a second pressure gauge 23 and a second shut-off valve 22 are provided on the third pipeline 24 , and the liquid hydrogen storage tank 21 is sequentially connected to the second shut-off valve 22 , the second pressure gauge 23 and the test storage tank 11 through the third pipeline 24 .

[0042] In a specific embodiment, the second stop valve 22 is used to control the on-off of the third pipeline 24, thereby controlling the filling and stopping of liquid hydrogen. The second pressure gauge 23 monitors the liquid hydrogen pressure on the third pipeline 24 in real time and monitors the third pipeline 24 in real time.

[0043] Furthermore, the delivery end assembly 2 also includes a hydrogen storage tank 25 and a fourth pipeline 29 , one end of the fourth pipeline 29 is connected to the interior of the test tank 11 , and the other end is connected to the hydrogen storage tank 25 .

[0044] In a specific embodiment, the fourth pipeline 29 is used to connect the test tank 11 and the hydrogen tank 25. The hydrogen tank 25 is used to provide pressure to the test tank 11. By delivering hydrogen, different pressure environments are simulated to facilitate the completion of the piston maze test under different pressures.

[0045] Furthermore, a third pressure gauge 28, a third stop valve 26 and a pressure reducing valve 27 are also provided on the fourth pipeline 29, and the hydrogen storage tank 25 is connected to the third stop valve 26, the pressure reducing valve 27, the third pressure gauge 28 and the hydrogen storage tank 25 in sequence through the fourth pipeline 29.

[0046] In a specific embodiment, the third pressure gauge 28 is used to detect the pressure of hydrogen on the third pipeline 24, the third stop valve 26 is used to control the on-off of the third pipeline 24, and the pressure reducing valve 27 is used to reduce the pressure of the pipeline to prevent the pipeline pressure from being too high.

[0047] Furthermore, it also includes a recovery end component 3, which includes a hydrogen recovery tank 37 and a fifth pipeline 31. A branch at one end of the fifth pipeline 31 is connected to the sixth pipeline 39 and the top of the sealing test device 13 in sequence and is connected to the rear cavity. Another branch is connected to the seventh pipeline 38, the pressure relief valve 310 and the inside of the test tank 11 in sequence, and the other end is connected to the hydrogen recovery tank 37.

[0048] In a specific embodiment, the hydrogen recovery tank 37 is used to recover the hydrogen after the test, the sixth pipeline 39 is used to recover the liquid hydrogen in the sealing test device 13, and the seventh pipeline 38 is used for pressure relief. When the liquid hydrogen pressure in the test tank 11 is too high, part of the hydrogen is discharged through the pressure relief valve 310 on the seventh pipeline 38 to reduce the pressure.

[0049] Furthermore, the recovery end component 3 also includes a rewarmer 32 , which is arranged on the fifth pipeline 31 .

[0050] In a specific embodiment, the reheater 32 is used to recover the cold energy of the hydrogen. After the test is completed, the liquid hydrogen will be converted into low-temperature hydrogen in the rear cavity. The reheater 32 is then used to recover the heat of the hydrogen and the hydrogen is recovered into the test tank 11.

[0051] In one embodiment, the reheater 32 may be an aluminum plate vaporizer or a coil heat exchanger, or other heat exchangers to reheat the low-temperature hydrogen to room temperature.

[0052] Furthermore, a fourth stop valve 36, a flow meter 35, a second thermometer 34 and a fourth pressure gauge 33 are also provided on the fifth pipeline 31, and the hydrogen recovery tank 37 is connected to the fourth stop valve 36, the flow meter 35, the second thermometer 34, the fourth pressure gauge 33 and the reheater 32 in sequence through the fifth pipeline 31.

[0053] In a specific embodiment, the fourth stop valve 36 is used to control the on-off of the fifth pipeline 31, and the flow meter 35, the second thermometer 34 and the fourth pressure gauge 33 monitor the parameters of the top outlet end of the sealing test device 13. The parameters of hydrogen are tested by the flow meter 35, the second thermometer 34 and the fourth pressure gauge 33, thereby reflecting the amount of liquid hydrogen leakage in the sealed flow channel of the piston maze to be tested under a specific pressure and low-temperature liquid hydrogen temperature zone.

[0054] In one embodiment, the second thermometer 34 and the fourth pressure gauge are both normal temperature hydrogen pressure gauge and thermometer, and the flow meter 35 can adopt multiple parallel segmented flow meters 35 to meet the requirements of hydrogen flow measurement with different range accuracy.

[0055] In summary, the specific use includes the following steps:

[0056] First assemble the cylinder wall assembly and the piston wall assembly, and then build the entire system. After the construction is completed, first use nitrogen with a purity of not less than 99.999% to replace the gas inside the test system and the pipeline until the redundant gas impurity content in the system meets the requirements and the system maintains a residual pressure of about 0.15MPa (gauge pressure in the system). Then open the second stop valve 22, and fill the liquid hydrogen storage tank 21 with liquid hydrogen through the third pipeline 24 for pre-cooling until the liquid level stabilizes to a suitable position, then close the second stop valve 22, open the third stop valve 26 and adjust the pressure reducing valve 27. When the first pressure gauge 19 shows a suitable and stable reading, open the first stop valve 5 and the fourth stop valve 36, and the liquid hydrogen enters the front cavity, then flows through the sealed flow channel and vaporizes at the end of the sealed flow channel and in the rear cavity. The low-temperature hydrogen passes through the sixth pipeline 39, the fifth pipeline 31 and the rewarmer 32 in sequence, and is reheated in the rewarmer 32. The pressure, temperature and flow are measured by the fourth pressure gauge 33, the second thermometer 34 and the flowmeter 35 on the fifth pipeline 31. Finally, the leaked hydrogen is discharged into the hydrogen recovery tank 37, thereby completing the measurement of the liquid hydrogen leakage in the labyrinth seal flow channel of the piston to be tested under a specific pressure and liquid hydrogen temperature range. After the measurement is completed, the first stop valve 5 is closed, the pressure relief valve 310 is opened, and the pressure inside the test tank 11 is adjusted to about 0.15 MPa. Then the pressure relief valve 310 and the fourth stop valve 36 are closed. After the measurement, the measured gas leakage amount needs to be converted into the leakage volume flow rate of liquid hydrogen per unit circumference at low temperature according to the physical properties.

[0057] In one embodiment, the utility model can also simultaneously test the static sealing performance of piston labyrinths of two different types or structural sizes, and screen out the labyrinth sealing structure type with excellent static sealing performance to ensure the efficient operation of the liquid hydrogen reciprocating pump. When testing the static sealing performance of piston labyrinths of two different types or sizes, it is necessary to fix two sealing test devices 13 to the flange sealing cover 12, and then use two sixth pipelines 39 to connect the two sealing test devices 13 to the fifth pipeline 31 respectively, and connect the two first pipelines 14 and the two first stop valves 5 to the bottom of the two sealing test devices 13, and finally test each sealing test device 13 in turn.

[0058] Through the test system provided by the present invention, the leakage measurement of liquid hydrogen at 0.1-1.5MPa and temperature of 20-33K through the labyrinth seal flow channel can be achieved, thereby effectively evaluating the volumetric efficiency loss of the liquid hydrogen piston pump. At the same time, since the sealing test device 13 has a simple structure and a small size, it is easy to disassemble and assemble, and the labyrinth seal structure of the test can be changed by replacing the piston wall component. Finally, since the piston labyrinth cavity is processed on the sealing test component, it is equivalent to cutting off a small section on the circumference of the piston labyrinth for testing. The leakage flow of the system can be reduced to less than 20% relative to the complete piston labyrinth, and there is no need to test the leakage with the same liquid hydrogen flow as the complete piston labyrinth. The entire system is simpler to build and more conducive to measuring relevant parameters.

[0059] 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 liquid hydrogen piston pump static labyrinth seal performance test system, characterized in that: Includes a low temperature test tip assembly, including: The low-temperature test end assembly includes a test tank and a flange sealing cover, wherein the flange sealing cover is disposed on the test tank and is sealedly connected to the test tank, and at least one sealing test device is disposed on the flange sealing cover, wherein a mounting hole is provided on the flange sealing cover, a fixing flange is disposed in the mounting hole, and the sealing test device is fixed to the flange sealing cover via the fixing flange; The sealing test device includes a cylinder wall assembly and a piston wall assembly, which are tightly and sealingly connected to form the sealing test device. The sealing test device is processed with a rear cavity at the top, a front cavity at the bottom and a sealing flow channel, and the rear cavity and the front cavity are connected through a sealing flow channel.

2. The liquid hydrogen piston pump static labyrinth seal performance test system according to claim 1, characterized in that: The low-temperature test end assembly further includes a first pipeline and a first stop valve. The first pipeline is connected to the bottom of the sealing test device and communicates with the front cavity. The first stop valve is arranged on the first pipeline.

3. The liquid hydrogen piston pump static labyrinth seal performance test system according to claim 1, characterized in that: The low-temperature test end assembly also includes a second pipeline, which is arranged on the top of the flange sealing cover and communicates with the interior of the test tank. The ends of the second pipeline are respectively provided with a first thermometer, a first pressure gauge and a liquid hydrogen level gauge.

4. The liquid hydrogen piston pump static labyrinth seal performance testing system according to claim 1, characterized in that: It also includes a delivery end component, which includes a third pipeline and a liquid hydrogen storage tank. One end of the third pipeline is connected to the interior of the test tank, and the other end is connected to the liquid hydrogen storage tank.

5. The liquid hydrogen piston pump static labyrinth seal performance testing system according to claim 4, characterized in that: The third pipeline is also provided with a second pressure gauge and a second shut-off valve. The liquid hydrogen storage tank is sequentially connected to the second shut-off valve, the second pressure gauge and the test storage tank through the third pipeline.

6. The liquid hydrogen piston pump static labyrinth seal performance testing system according to claim 5, characterized in that: The delivery end assembly further includes a hydrogen storage tank and a fourth pipeline, one end of the fourth pipeline is connected to the interior of the test tank, and the other end is connected to the hydrogen storage tank.

7. The liquid hydrogen piston pump static labyrinth seal performance testing system according to claim 6, characterized in that: The fourth pipeline is also provided with a third pressure gauge, a third shut-off valve and a pressure reducing valve. The hydrogen storage tank is sequentially connected to the third shut-off valve, the pressure reducing valve, the third pressure gauge and the hydrogen storage tank through the fourth pipeline.

8. The liquid hydrogen piston pump static labyrinth seal performance testing system according to claim 1, characterized in that: It also includes a recovery end component, which includes a hydrogen recovery tank and a fifth pipeline. A branch at one end of the fifth pipeline is connected to the sixth pipeline and the top of the sealing test device in sequence and is connected to the rear cavity. Another branch is connected to the seventh pipeline, the pressure relief valve and the inside of the test tank in sequence, and the other end is connected to the hydrogen recovery tank.

9. The liquid hydrogen piston pump static labyrinth seal performance testing system according to claim 8, characterized in that: The recovery end component further includes a rewarmer, which is arranged on the fifth pipeline.

10. The liquid hydrogen piston pump static labyrinth seal performance testing system according to claim 9, characterized in that: The fifth pipeline is also provided with a fourth stop valve, a flow meter, a second thermometer and a fourth pressure gauge, and the hydrogen recovery tank is connected to the fourth stop valve, the flow meter, the second thermometer, the fourth pressure gauge and the reheater in sequence through the fifth pipeline.

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