CN113285100B

CN113285100B - Performance test system for hydrogen circulating pump of hydrogen fuel cell

Info

Publication number: CN113285100B
Application number: CN202110539233.9A
Authority: CN
Inventors: 黄魏; 贺雪强; 唐陈; 甘露; 乔永杰; 伍晶鑫; 黄凯
Original assignee: Cssc Southwest Equipment Research Institute Co ltd
Current assignee: Cssc Southwest Equipment Research Institute Co ltd
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2022-10-11
Anticipated expiration: 2041-05-18
Also published as: CN113285100A

Abstract

The invention relates to a fuel cell, and discloses a performance test system of a hydrogen circulating pump of a hydrogen fuel cell, which comprises a test gas supply unit, wherein the test gas supply unit is sequentially connected with an air inlet buffer tank, a working condition control unit, a first flow monitoring unit, a first data acquisition unit, a hydrogen circulating pump, a second data acquisition unit, an exhaust buffer tank and a second flow monitoring unit through pipelines; the output of second flow monitor unit with be equipped with third valve and second valve in proper order on the pipeline between the input of inlet buffer tank, the output of test gas supply unit through first valve communicate in on the pipeline between second valve and the third valve, the second valve with be provided with air supply unit on the pipeline between the inlet buffer tank, the major loop is through total unloading pipeline and atmosphere intercommunication. The invention more accurately simulates the real operating environment of the hydrogen circulating pump in the hydrogen fuel cell.

Description

Performance test system for hydrogen circulating pump of hydrogen fuel cell

Technical Field

The invention relates to the technical field of fuel cells, in particular to a performance test system for a hydrogen circulating pump of a hydrogen fuel cell.

Background

A fuel cell is a chemical device that directly converts chemical energy possessed by a fuel into electrical energy, and includes a solid oxide fuel cell, a hydrogen fuel cell, an alkaline fuel cell, a phosphoric acid fuel cell, and the like. Among them, the hydrogen fuel cell is a power generation device that directly converts chemical energy of hydrogen and oxygen into electric energy. The hydrogen fuel cell can meet the application requirements in the fields of transportation, fixed power supply and the like by virtue of the advantages of cleanness, low working temperature, quick start, high specific power and the like, and is developed into a mainstream technical route of the fuel cell at home and abroad.

As an important component of a hydrogen supply system of a hydrogen fuel cell, the hydrogen circulation system is used for conveying unreacted hydrogen from an outlet of a galvanic pile to an inlet of the galvanic pile, and the unreacted hydrogen is merged with inlet reaction gas and then enters the galvanic pile. On one hand, the hydrogen circulating system brings the moisture of the reaction gas tail gas into the galvanic pile to play a role of humidification; on the other hand, the flow velocity of the hydrogen in the anode flow channel of the fuel cell is improved, and anode flooding is avoided; meanwhile, the purpose of improving the utilization rate of the hydrogen is achieved. The hydrogen circulating pump is as hydrogen circulation system's key equipment of core, and the working property directly determines hydrogen endless effect, and then directly influences the performance of galvanic pile. In order to ensure the efficient and stable operation of the fuel cell system, the selection of the hydrogen circulating pump is very important.

Most of the current hydrogen circulating pump performance test systems are common positive displacement pump test platforms, various actual operation working conditions of a hydrogen circulating pump cannot be simulated accurately, particularly complex inlet working conditions of hydrogen, nitrogen and water mixed gas at different temperatures and under different pressures are difficult to realize, so that performance parameters of the hydrogen circulating pump developed through test tests have certain difference with actual requirements of a fuel cell, and the hydrogen circulating pump cannot be reasonably matched to realize efficient and stable operation of the whole machine after being assembled with the fuel cell. Therefore, it is necessary to develop a special hydrogen circulation pump performance test system and perform a hydrogen circulation pump test.

Disclosure of Invention

Aiming at the defects of the prior art, the performance test system for the hydrogen circulating pump of the hydrogen fuel cell is provided, according to the principles of full working condition coverage, stable and adjustable working condition, safety and controllability of actual operation of the hydrogen circulating pump and real-time and accurate acquisition of test data, the simulation of air inlet working conditions of different gas components, pressure, temperature and humidity of the hydrogen circulating pump can be realized, the performance test of a hydrogen circulating pump prototype and a product is completed by the performance test system for the hydrogen circulating pump, the performance state of the hydrogen circulating pump to be tested can be judged, and test data support is provided for design and optimization of the hydrogen circulating pump, so that the problems are solved.

In order to solve the technical problems, the invention adopts the following technical scheme:

a performance test system for a hydrogen circulating pump of a hydrogen fuel cell comprises a test gas supply unit, wherein the test gas supply unit is sequentially connected with an air inlet buffer tank, a working condition control unit, a first flow monitoring unit, a first data acquisition unit, the hydrogen circulating pump, a second data acquisition unit, an exhaust buffer tank and a second flow monitoring unit through pipelines; the gas inlet buffer tank, the working condition control unit, the first flow monitoring unit, the first data acquisition unit, the hydrogen circulating pump, the second data acquisition unit, the exhaust buffer tank and the second flow monitoring unit form a main loop through pipelines, a first bypass unit is arranged on a parallel link of the working condition control unit, a second bypass unit and an exhaust oil content detection unit are arranged on a parallel link of the second flow monitoring unit, and the second bypass unit and the exhaust oil content detection unit are arranged in series; a third bypass unit is arranged on a parallel link of the first flow monitoring unit; the test device comprises a first flow monitoring unit, a second flow monitoring unit, a gas inlet buffer tank, a main loop, a third valve, a second valve, a third valve, a fourth valve, a fifth valve and a sixth valve, wherein the first valve is arranged on a pipeline between the output end of the first flow monitoring unit and the input end of the gas inlet buffer tank in sequence;

the gas inlet buffer tank and the gas exhaust buffer tank are used for enabling gas in the test system to flow stably and relieving gas pressure fluctuation, and the gas inlet buffer tank and the gas exhaust buffer tank also have the function of a gas storage tank in closed type circulating flow;

the test gas supply unit is used for providing different test gases for the test system;

the air supply unit is used for providing air for the test system;

the working condition control unit is used for providing different states for gas entering the hydrogen circulating pump so as to simulate the gas inlet working condition of the hydrogen circulating pump;

the first flow monitoring unit is used for monitoring the flow of the gas entering the hydrogen circulating pump;

the first data acquisition unit is used for detecting the state of gas entering the hydrogen circulating pump;

the second data acquisition unit is used for detecting the state of the gas discharged from the hydrogen circulating pump;

the second flow monitoring unit is used for monitoring the flow of the gas exhausted from the exhaust buffer tank;

the gas detector is used for detecting the gas components and the content in the test system on line in real time;

the first bypass unit is used for controlling the on and off of the working condition control unit;

the second bypass unit is used for controlling the on and off of the second flow monitoring unit;

the third bypass unit is used for controlling the on and off of the first flow monitoring unit;

the exhaust gas oil content detection unit is used for detecting the oil content of the gas exhausted from the exhaust buffer tank;

the testing system also comprises a power supply and distribution system for providing a power supply for the testing system and a master control unit for controlling the testing system.

In the technical scheme, the open test of direct discharge of hydrogen and the closed test of hydrogen circulation can be realized by the test system. When the open test of the hydrogen is needed, a first valve, a second valve, a fourth valve, a fifth valve and a sixth valve are opened, the third valve is closed, the hydrogen circulating pump starts to work, then the hydrogen is provided by a test gas supply unit, the hydrogen enters a working condition control unit through an air inlet buffer tank and enters the hydrogen circulating pump through a first flow monitoring unit after being regulated by the working condition control unit, a first data acquisition unit can detect the gas state before entering the hydrogen circulating pump, the hydrogen is compressed in the hydrogen circulating pump, the compressed hydrogen is discharged through the fourth valve and the sixth valve after passing through an exhaust buffer tank and a second flow monitoring unit, and a second data acquisition unit can detect the gas state after passing through the hydrogen circulating pump; when a closed test on hydrogen is needed, closing the fourth valve and the sixth valve, and opening the first valve, the second valve, the third valve and the fifth valve; hydrogen passes through the exhaust buffer tank and the second flow monitoring unit and then is recycled through the third valve and the second valve; the temperature and humidity of the gas and the oil content of the test gas can be controlled by the first bypass unit and the second bypass unit.

Preferably, the test gas supply unit comprises a hydrogen supply unit and a nitrogen supply unit, wherein the hydrogen supply unit comprises a hydrogen source, a first bus bar and an electromagnetic valve which are sequentially connected through a pipeline, the nitrogen supply unit comprises a nitrogen source and a second bus bar which are sequentially connected through a pipeline, and the output end of the second bus bar and one end of the electromagnetic valve are jointly connected with the first valve; the air supply unit comprises an air source and a first ball valve, and the output end of the air source is connected with the input end of the air inlet buffer tank through the first ball valve.

Therefore, when an open type test of direct hydrogen discharge and a closed type test of hydrogen circulation are required, the hydrogen source is opened, and the flow of hydrogen is regulated through the first busbar, so that hydrogen is provided; when gas composition adjustment is needed, the nitrogen source and the hydrogen source can be opened simultaneously, hydrogen and nitrogen enter the test system through the first busbar and the second busbar respectively, and due to the fact that hydrogen is combustible gas, after the hydrogen concentration in the laboratory reaches the combustible limit, the electromagnetic valve is linked to automatically close and cut off the gas source to automatically supply gas to the system.

As the optimization, first busbar and second busbar include the gas cylinder respectively connect and with the gas cylinder connects first check valve, filter, one-level relief pressure valve and second grade relief pressure valve and the second ball valve that connect gradually through the pipeline, and gas passes through the gas cylinder and connects and first check valve flow direction filter, still includes parallelly connected relief valve and the first needle valve that sets up, the one end setting of the parallel link of relief valve and first needle valve is in on the pipeline between second grade relief pressure valve and the second ball valve, the other end of the parallel link of relief valve, first needle valve is through second evacuation pipeline and atmosphere intercommunication, the gas cylinder connect with hydrogen source or nitrogen source are connected.

Therefore, the first bus bar and the second bus bar are integrated module panel type bus bars and are composed of a gas cylinder connector, a first check valve, a filter, a primary pressure reducing valve, a secondary pressure reducing valve, a safety valve, a second emptying pipeline, a needle valve, a ball valve and corresponding pipelines. After passing through the first check valve, the hydrogen and nitrogen (collectively referred to as gas) from the hydrogen source and the nitrogen source (collectively referred to as gas source) can realize that the gas flows from the gas source to the test system in a one-way, so that the gas is prevented from flowing back to the gas source; impurities contained in a filterable gas source are filtered to ensure the cleanness of the gas entering the test system; the primary pressure reducing valve and the secondary pressure reducing valve can adjust the pressure of gas entering the test system; the safety valve is automatically opened and discharged after the gas passing through the secondary pressure reducing valve exceeds the highest pressure of the system, and the pressure threshold of the safety valve can be set, so that the safety of the system is ensured in the prior art; the first needle valve is used for manually regulating and discharging gas in the first and second busbars; the gas enters the test system through the ball valve and the pipeline.

As optimization, the operating mode control unit includes temperature control unit and humidity control unit, the output of buffer tank that admits air passes through the pipeline and is connected with temperature control unit, humidity control unit and first flow monitoring unit in proper order, wherein, temperature control unit includes the heater, the input and the output of heater are equipped with the third ball valve respectively, humidity control unit include through the pipeline in proper order with heater connection's humidifier and catch water, the input and the output of humidifier are equipped with the fourth ball valve respectively, catch water's output is equipped with the fifth ball valve.

Thus, the heater heats the gas entering the hydrogen circulating pump, and the temperature control of the system can be realized; the humidifier and the steam-water separator can realize the adjustment of humidity.

As optimization, the first bypass unit comprises a sixth ball valve, a seventh ball valve and an eighth ball valve, two ends of the sixth ball valve are respectively connected with one ends of the two third ball valves, which are far away from the heater, one end of the seventh ball valve is communicated with a pipeline between the adjacent third ball valve and the adjacent fourth ball valve, the other end of the seventh ball valve is communicated with one end of the fifth ball valve, which is far away from the steam-water separator, one end of the eighth ball valve is communicated with one end of the fourth ball valve, which is far away from the steam-water separator, and the other end of the eighth ball valve is communicated with one end of the fifth ball valve, which is far away from the steam-water separator;

the second bypass unit comprises an eleventh ball valve and a twelfth ball valve, the input end of the exhaust oil-containing detection unit is connected with one end of the eleventh ball valve, the output end of the exhaust oil-containing detection unit is connected with one end of the twelfth ball valve, the other end of the eleventh ball valve is connected with the output end of the exhaust buffer tank, and the other end of the twelfth ball valve is connected with one end, far away from the second flow sensor, of the tenth ball valve;

the third bypass unit comprises a thirteenth ball valve, one end of the thirteenth ball valve is connected with one end, far away from the steam-water separator, of the fifth ball valve, and the other end of the thirteenth ball valve is connected with the input end of the first data acquisition unit.

Therefore, the adjustment of the temperature and the humidity of the gas can be realized by controlling the combination and the reasonable switch of the third ball valve, the fourth ball valve, the fifth ball valve, the sixth ball valve, the seventh ball valve and the eighth ball valve.

As optimization, the first flow monitoring unit comprises a second needle valve, one end of the second needle valve is connected with one end, far away from the steam-water separator, of the fifth ball valve, the other end of the second needle valve is sequentially connected with a first flow sensor and a ninth ball valve through a pipeline, and a third data acquisition unit is further arranged on the pipeline between the second needle valve and the first flow sensor;

the second flow monitoring unit includes the third needle valve, the one end of third needle valve with the output of exhaust buffer tank is connected, the other end of third needle valve passes through the pipeline and is connected with one of them end of second flow sensor and tenth ball valve in proper order, the other end of tenth ball valve passes through the pipeline and is connected with the third needle valve, the third needle valve with still be equipped with the fourth data acquisition unit on the pipeline between the second flow sensor.

Therefore, the adjustment of the gas flow can be realized and the gas flow can be detected through the combination and reasonable switching of the ninth ball valve, the tenth ball valve, the second needle valve, the third needle valve, the eleventh ball valve, the twelfth ball valve and the thirteenth ball valve, and the third data acquisition unit and the fourth data acquisition unit can detect the temperature and/or humidity and pressure of the gas so as to adjust the corresponding valves or the temperature control unit and the humidity control unit.

As optimization, the first data acquisition unit, the second data acquisition unit, the third data acquisition unit and the fourth data acquisition unit respectively comprise a temperature sensor, a thermometer, a pressure gauge and a pressure sensor, and the first data acquisition unit further comprises a humidity sensor and a hygrometer.

Like this, detect out gaseous temperature and pressure through temperature sensor and pressure sensor, transmit the information that detects for the data acquisition unit, the data transmission that the data acquisition unit will gather gives total control unit to total control unit control relevant valve, temperature control unit or humidity control unit adjust, can be more audio-visual humiture and the pressure of looking over gas in the test system through thermometer, hygrometer and manometer.

As optimization, the device further comprises a safety protection unit, wherein the safety protection unit comprises a flame arrester, a combustible gas detector, an audible and visual alarm, a safety valve, ground protection and an electromagnetic valve located in a hydrogen supply unit, the flame arrester is arranged on a first emptying pipeline and a total emptying pipeline of the exhaust buffer tank respectively, the safety valve is arranged between the first emptying pipeline of the exhaust buffer tank and the corresponding flame arrester, a second check valve for allowing gas to flow from a fourth valve to the flame arrester is arranged between the flame arrester on the total emptying pipeline and one end, away from a third valve, of the fourth valve, one end, away from the gas detector, of the sixth valve is connected with an input end of the second check valve on the total emptying pipeline, a third check valve for allowing gas to flow from a second data acquisition unit to the exhaust buffer tank is arranged at the input end of the exhaust buffer tank, the ground protection enables the test system to be grounded through a cable, the combustible gas detector is placed in a laboratory where the combustible gas detector is located, and the combustible gas detector, the electromagnetic valve and the audible and visual alarm are all connected with a control system.

Thus, the safety valve automatically opens to exhaust gas after the gas in the test system is over-pressurized; the second check valve and the third check valve prevent reverse flow of gas; the flame arrester prevents that flame from flowing back into test system under the unexpected burning condition of hydrogen, and the combustible gas detector detects the indoor hydrogen concentration at test system place, reaches the audible-visual annunciator of being connected with it and sends out the police dispatch newspaper after the flammable limit. The electromagnetic valve is a normally closed electromagnetic valve and is linked with the audible and visual alarm, after the audible and visual alarm gives an alarm, the electromagnetic valve is linked to automatically close and cut off the air source to automatically supply air to the system, and the grounding protection is that the whole test system is grounded through a cable, so that the generation of static electricity and sparks is avoided.

As optimization, still including the pressure adjustment needle valve that is used for a plurality of regulation test system pressure, the pressure adjustment needle valve sets up respectively the output of the buffer tank of admitting air, the output of exhaust buffer tank and second flow monitoring unit's output.

Therefore, the back pressure in the system during the test can be adjusted by changing the opening degree of the pressure adjusting needle valve, and the pressure adjustment of the test system is realized.

Preferably, the hydrogen circulating pump is electrically connected with a power analyzer.

In this way, parameters such as input and output power, voltage and current of the hydrogen circulation pump can be obtained through the power analyzer.

The invention has the beneficial effects that:

1. by the cooperation of each unit, can carry out initiative adjustment and control to the intake condition of different gas composition, temperature, pressure and humidity of hydrogen circulating pump for hydrogen fuel cell, simulate the true operational environment of hydrogen circulating pump in hydrogen fuel cell more accurately, and then can better adaptation hydrogen fuel cell.

2. According to the test data obtained by the test method, the performance of the designed hydrogen circulating pump can be effectively judged, and support is provided for the optimization design of the hydrogen circulating pump.

3. Besides the performance test of the hydrogen circulating pump, the test bed can also be used as a reliability test bed to carry out durability and start-stop test on the hydrogen circulating pump.

4. The test system can also meet the test conditions of other gas working medium pumps.

5. And a closed circulation mode is adopted, so that the test gas can be recycled, the test cost is favorably reduced, the resources are effectively saved, and the environment is protected.

Drawings

Fig. 1 is a schematic diagram of a system structure of a performance testing system for a hydrogen circulation pump of a hydrogen fuel cell according to the present invention.

Fig. 2 is a schematic structural diagram of a performance test system of a hydrogen circulation pump of a hydrogen fuel cell according to the present invention.

Fig. 3 is a schematic structural diagram of the first bus bar and the second bus bar in fig. 1.

Fig. 4 is a schematic structural view of the humidifier in fig. 2.

Fig. 5 is a schematic structural view of the steam-water separator in fig. 2.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "upper, lower" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

The input end and the output end of the ball valve are defined by the flowing direction of gas, and the gas flows from the input end to the output end of the ball valve.

As shown in fig. 1 to 5, a performance test system for a hydrogen circulation pump of a hydrogen fuel cell includes a test gas supply unit, which is connected to an intake buffer tank 10, a working condition control unit, a first flow monitoring unit, a first data acquisition unit, a hydrogen circulation pump 37, a second data acquisition unit, an exhaust buffer tank 44, and a second flow monitoring unit in sequence via a pipeline according to a gas flow direction; the air inlet buffer tank 10, the working condition control unit, the first flow monitoring unit, the first data acquisition unit, the hydrogen circulating pump 37, the second data acquisition unit, the exhaust buffer tank 44 and the second flow monitoring unit form a main loop through pipelines, a first bypass unit is arranged on a parallel link of the working condition control unit, a second bypass unit and an exhaust oil content detection unit are arranged on a parallel link of the second flow monitoring unit, and the second bypass unit and the exhaust oil content detection unit are arranged in series; the exhaust oil content detection unit may be a gas oil content detection device, a third valve 57 and a second valve 7 are sequentially arranged on a pipeline between an output end of the second flow rate monitoring unit and an input end of the intake buffer tank 10, an output end of the test gas supply unit is communicated with a pipeline between the second valve 7 and the third valve 57 through a first intake pipe, a first valve 6 is arranged on the first intake pipe of the test gas supply unit, an air supply unit is arranged on a pipeline between the second valve 7 and the intake buffer tank 10, the exhaust oil content detection device further comprises a gas detector, a fourth valve 58, a fifth valve 56 and a sixth valve 59, an input end of the gas detector is communicated with a pipeline between the second flow rate monitoring unit and the third valve 57 through the fifth valve 56, the main loop is communicated with the atmosphere through a total emptying pipeline, the total emptying pipeline is arranged on a pipeline between the third valve 57 and the fifth valve 56, the fourth valve 58 is arranged on the total emptying pipeline, and an output end of the gas detector is communicated with the atmosphere through the sixth valve 59;

the air inlet buffer tank 10 and the air exhaust buffer tank 44 are used for enabling the air in the test system to flow stably and relieving the pressure fluctuation of the air, and have the functions similar to an air storage tank in the closed circulating flow; specifically, the air inlet buffer tank and the air outlet buffer tank are made of stainless steel, the air inlet pipelines and the air outlet pipelines of the air inlet buffer tank and the air outlet buffer tank are arranged in a way of 90 degrees, downward inlet pipelines and upward outlet pipelines; simultaneously, the buffer tank of admitting air and exhaust buffer tank are equipped with first drainage pipeline respectively, install first flowing back ball valve (11 in fig. 2, 45) on the first drainage pipeline respectively, and simultaneously, still be equipped with the manometer on buffer tank of admitting air and the exhaust buffer tank for the inside pressure of monitoring buffer tank of admitting air and exhaust buffer tank.

the air supply unit is used for providing air for the test system;

the second data acquisition unit is used for detecting the state of gas discharged from the hydrogen circulating pump;

the second flow monitoring unit is used for monitoring the flow of the gas discharged from the exhaust buffer tank;

the testing system also comprises a power supply and distribution system for providing power for the testing system and a master control unit for controlling the testing system. In this embodiment, the first valve 6, the second valve 7, the third valve 57, the fourth valve 58, the fifth valve 56, and the sixth valve 59 are all ball valves.

In the technical scheme, the open test of direct discharge of hydrogen and the closed test of hydrogen circulation can be realized by the test system. When the open test of the hydrogen is needed, a first valve, a second valve, a fourth valve, a fifth valve and a sixth valve are opened, the third valve is closed, the hydrogen circulating pump starts to work, then the hydrogen is provided by a test gas supply unit, the hydrogen enters a working condition control unit through an air inlet buffer tank and enters the hydrogen circulating pump through a first flow monitoring unit after being regulated by the working condition control unit, a first data acquisition unit can detect the gas state before entering the hydrogen circulating pump, the hydrogen is compressed in the hydrogen circulating pump, the compressed hydrogen is discharged through the fourth valve and the sixth valve after passing through an exhaust buffer tank and a second flow monitoring unit, and a second data acquisition unit can detect the gas state after passing through the hydrogen circulating pump; when a closed test on hydrogen is needed, closing the fourth valve and the sixth valve, and opening the first valve, the second valve, the third valve and the fifth valve; hydrogen passes through the exhaust buffer tank and the second flow monitoring unit, and then is recycled through the third valve and the second valve; the temperature and humidity of the gas and the oil content of the test gas can be controlled by the first bypass unit and the second bypass unit.

In this embodiment, the test gas supply unit includes a hydrogen supply unit and a nitrogen supply unit, wherein the hydrogen supply unit includes a hydrogen source 2, a first bus bar 3 and an electromagnetic valve 5 which are sequentially connected through a pipeline, the nitrogen supply unit includes a nitrogen source 1 and a second bus bar 4 which are sequentially connected through a pipeline, and an output end of the second bus bar 4 and an output end of the electromagnetic valve 5 are jointly connected with an input end of the first valve 6; the air supply unit comprises an air source 9 and a first ball valve 8, a second air inlet pipe connected with the main loop is arranged at the output end of the air source 9, the first ball valve 8 is arranged in the second air inlet pipe of the air source 9, and the second air inlet pipe of the air source 9 is connected with the input end of the air inlet buffer tank 10. The hydrogen source 2 and the nitrogen source 1 adopt standard high-pressure gas cylinders for supplying gas, and the air source adopts an air compressor 9 for providing air working media for the test system so that the gas supply source is connected into the test system through respective gas inlet pipes and connecting pieces.

Therefore, when an open test of direct hydrogen discharge and a closed test of hydrogen circulation are required, a hydrogen source is opened, and the flow of hydrogen is regulated through the first bus bar, so that hydrogen is provided; when gas composition adjustment is needed, the nitrogen source and the hydrogen source can be opened simultaneously, hydrogen and nitrogen enter the test system through the first busbar and the second busbar respectively, and due to the fact that hydrogen is combustible gas, after the hydrogen concentration in the laboratory reaches the combustible limit, the electromagnetic valve is linked to automatically close and cut off the gas source to automatically supply gas to the system.

In this embodiment, the first bus bar 3 and the second bus bar 4 respectively include a gas cylinder connector 62, and a first check valve 63, a filter 65, a first-stage pressure reducing valve 66, a second-stage pressure reducing valve 67, and a second ball valve 70 sequentially connected to the gas cylinder connector through a pipeline, and the gas flows to the filter 65 through the gas cylinder connector and the first check valve 63, and further include a safety valve 68 and a first needle valve 69 arranged in parallel, one end of a parallel link of the safety valve 68 and the first needle valve 69 is arranged on the pipeline between the second-stage pressure reducing valve 67 and the second ball valve 70, the other end of the parallel link of the safety valve 68 and the first needle valve 69 is communicated with the atmosphere through a second emptying pipeline, and the gas cylinder connector 62 is connected to the hydrogen source 2 or the nitrogen source 1.

In this way, the first busbar 3 and the second busbar 4 are integrated module panel type busbars, and each busbar is composed of a gas cylinder connector 62, a first check valve 63, a filter 65, a primary pressure reducing valve 66, a secondary pressure reducing valve 67, a safety valve 68, a second emptying pipeline, a needle valve 69, a ball valve 70 and corresponding pipelines, wherein a metal hose 64 is arranged between the first check valve 63 and the filter 65, so that the flexibility is guaranteed, and meanwhile, the strength of a pipeline between the first check valve 63 and the filter 65 is guaranteed. After passing through the first check valve 63, the hydrogen and nitrogen (collectively referred to as gas) from the hydrogen source and the nitrogen source (collectively referred to as gas source) can realize one-way gas flow from the gas source to the test system, and prevent the gas from flowing back to the gas source; the filter 65 can filter impurities contained in the gas source to ensure the cleanness of the gas entering the test system; the primary pressure reducing valve 66 and the secondary pressure reducing valve 67 can adjust the pressure of gas entering the test system; the safety valve 68 is opened and exhausted automatically after the gas passing through the secondary pressure reducing valve exceeds the highest pressure of the system, and the pressure threshold value of the safety valve can be set, so that the safety of the system is ensured; the first needle valve 69 is used for manually adjusting and discharging gas in the first and second busbars; the gas enters the test system through ball valve 70 and tubing.

In this embodiment, the working condition control unit includes a temperature control unit and a humidity control unit, an output end of the air inlet buffer tank 10 is sequentially connected with the temperature control unit, the humidity control unit and the first flow monitoring unit through pipelines, wherein the temperature control unit includes a heater 14, an input end and an output end of the heater 14 are respectively provided with a third ball valve 13 and a third ball valve 15, specifically, the heater 14 is an explosion-proof electric heater with adjustable power, the humidity control unit includes a humidifier 20 and a steam-water separator 24 which are sequentially connected with the heater 14 through pipelines, a liquid injection port of the humidifier 20 is provided with a liquid injection ball valve 19, and the liquid injection ball valve 19 is used for controlling the on-off state of the liquid injection port of the humidifier; a second liquid drainage pipeline is arranged at a liquid drainage port of the humidifier 20, a second liquid drainage ball valve 21 is arranged on the second liquid drainage pipeline, fourth ball valves 18 and 23 are respectively arranged at the input end and the output end of the humidifier, a fifth ball valve 26 is arranged at the output end of the steam-water separator 24, a third liquid drainage pipeline is arranged at the liquid drainage port of the steam-water separator 24, and a third liquid drainage ball valve 25 is arranged on the third liquid drainage pipeline. A humidifier 20 and a steam-water separator 24, as shown in fig. 4 and 5, the humidifier 20 is a bubble type humidifier, and is composed of a tank 71, a liquid inlet 72, a liquid outlet 73, a gas inlet 74, a gas outlet 75 and a liquid level height meter 76; the steam-water separator 24 is a baffle type steam-water separator, and is composed of a tank 81, a baffle 77, an air inlet 78, an air outlet 79 and a liquid outlet 80.

Thus, the heater heats the gas entering the hydrogen circulating pump, and the temperature control of the system can be realized; the humidifier 20 and the steam separator 24 may achieve humidity regulation.

In this embodiment, the first bypass unit includes a sixth ball valve 16, a seventh ball valve 17 and an eighth ball valve 22, an input end of the sixth ball valve 16 is connected to an input end of the third ball valve 13, an output end of the sixth ball valve 16 is connected to an output end of the third ball valve 15, an input end of the seventh ball valve 17 is communicated with a pipeline between the third ball valve 15 and the fourth ball valve 18, an output end of the seventh ball valve 17 is communicated with an output end of a fifth ball valve 26, an input end of the eighth ball valve 22 is connected to an input end of a fourth ball valve 23, and an output end of the eighth ball valve 22 is communicated with an output end of the fifth ball valve 26;

the second bypass unit comprises an eleventh ball valve 47 and a twelfth ball valve 48, the input end of the exhaust oil-containing detection unit is connected with the output end of the eleventh ball valve 47, the output end of the exhaust oil-containing detection unit is connected with the input end of the twelfth ball valve 48, the input end of the eleventh ball valve 47 is connected with the output end of the exhaust buffer tank, and the output end of the twelfth ball valve 48 is connected with the output end of the tenth ball valve 53;

the third bypass unit comprises a thirteenth ball valve 27, an input end of the thirteenth ball valve 27 is connected with an output end of the fifth ball valve 26, and an output end of the thirteenth ball valve 27 is connected with an input end of the first data acquisition unit.

Specifically, the sixth ball valve controls the bypass switch state of the heater 14; the seventh ball valve 17 controls the opening and closing state of a bypass pipeline of the main loop pipeline, the eighth ball valve 22 controls the opening and closing state of a bypass of the steam-water separator 24, when the main loop pipeline is opened, the seventh ball valve 17 is closed, the fourth ball valves (18 and 23) and the fifth ball valve 26 are opened, and when the bypass pipeline is opened, the opposite is true. When the main pipeline of the steam-water separator 24 is opened, the eighth ball valve 22 is closed, the fourth ball valve 23 and the fifth ball valve 26 are opened, and when the bypass pipeline is opened, the opposite is true.

In this embodiment, the first flow monitoring unit includes a second needle valve 28, an input end of the second needle valve 28 is connected to an output end of the fifth ball valve 26, an output end of the second needle valve 28 is sequentially connected to a first flow sensor 31 and a ninth ball valve 32 through a pipeline, and a third data acquisition unit is further disposed on the pipeline between the second needle valve 28 and the first flow sensor 31;

the second flow monitoring unit includes third needle valve 49, the input of third needle valve 49 with exhaust buffer tank 44's output is connected, the output of third needle valve 49 passes through the pipeline and is connected with second flow sensor 52 and tenth ball valve 53's input in proper order, the output of tenth ball valve passes through the pipeline and is connected with third valve 57, third needle valve 49 with still be equipped with the fourth data acquisition unit on the pipeline between second flow sensor 52.

Therefore, the adjustment of the gas flow can be realized and the gas flow can be detected through the combination and reasonable switching of the ninth ball valve, the tenth ball valve, the second needle valve, the third needle valve, the eleventh ball valve, the twelfth ball valve and the thirteenth ball valve, specifically, the second needle valve 28 can control and adjust the state of the first flow monitoring unit, the thirteenth ball valve 27 and the ninth ball valve 32 control the pipeline switching state, when the main loop pipeline is opened, the thirteenth ball valve 27 is closed, and the second needle valve 28 and the ninth ball valve 32 are opened, the bypass pipeline is opened reversely, meanwhile, in the oil content detection process, when the eleventh ball valve 47 is closed after the test is finished, the twelfth ball valve 48 is closed at the same time, and the pipeline of the gas passing through the tenth ball valve 53 can be prevented from flowing back to the oil content detection device. The third and fourth data acquisition units may detect the temperature and/or humidity and pressure of the gas in order to adjust the respective valves or the temperature control unit and the humidity control unit.

In the present embodimentThe first data acquisition unit, the second data acquisition unit, the third data acquisition unit and the fourth data acquisition unit respectively comprise a temperature sensor (34, 39, 29 and 50 in figure 2) and a thermometer (34, 39, 29 and 50 in figure 2)

) Pressure gauge (in fig. 2

) And a pressure sensor (35, 38, 30, 51 in fig. 2), the first data acquisition unit further comprising a humidity sensor 36 and a hygrometer (35, 38, 30, 51 in fig. 2)

)。

Like this, detect out gaseous temperature and pressure through temperature sensor and pressure sensor, the information transmission who will detect gives the data acquisition unit, the data transmission that the data acquisition unit will gather gives total control unit to total control unit control relevant valve, temperature control unit or humidity control unit adjust, can be more audio-visual the humiture and the pressure of looking over gas in the test system through thermometer, hygrometer and manometer.

In this embodiment, the test device further comprises a safety protection unit, the safety protection unit comprises flame arresters (43 and 61 in fig. 2), a combustible gas detector (not marked in the drawing), an audible and visual alarm (not marked in the drawing), a safety valve 42, a ground protection 55 and an electromagnetic valve 5 located in the hydrogen supply unit, the flame arresters (43 and 61 in fig. 2) are respectively arranged on a first vent pipeline and a total vent pipeline of the exhaust buffer tank 44, the safety valve 42 is arranged between the first vent pipeline of the exhaust buffer tank 44 and the corresponding flame arrester 43, a second check valve 60 allowing gas to flow from the fourth valve 58 to the flame arrester 61 is arranged on a pipeline between the flame arrester 61 on the total vent pipeline and an output end of the fourth valve 58, an output end far from the sixth valve 59 is connected with an input end of the second check valve 60 on the total vent pipeline, the input end of the exhaust buffer tank 44 is provided with a third check valve 41 allowing gas to flow from the second data acquisition unit to the exhaust buffer tank 44, the ground protection cable enables a main ground protection circuit to be placed in a main gas detection system and the combustible gas detection detector, and the audible and the experimental system and the combustible gas detection system and the audible and visual alarm.

Thus, the safety valve 42 plays a role of overpressure protection in the test system, and when the main loop pipe is in overpressure, the safety valve automatically opens to release pressure, so that gas in the test system is exhausted; the second check valve 60 and the third check valve 41 prevent the reverse flow of gas; specifically, the third check valve 41 prevents the high-pressure gas in the exhaust buffer tank 44 from flowing back toward the hydrogen circulation pump 37, and the second check valve 60 prevents the air from flowing back into the main circuit line when the main purge line is opened. Flame arresters (43 and 61 in fig. 2) prevent flame from flowing back into the test system under the condition of accidental combustion of hydrogen, a combustible gas detector detects the hydrogen concentration in a laboratory where the test system is located, and an audible and visual alarm connected with the combustible gas detector gives an alarm after the combustible gas detector reaches a combustible limit. The electromagnetic valve 5 is a normally closed electromagnetic valve and is linked with the audible and visual alarm, when the audible and visual alarm gives an alarm, the electromagnetic valve is linked to automatically close and cut off an air source to automatically supply air to the system, and the grounding protection 55 is used for grounding the whole test system through a cable so as to avoid generation of static electricity and sparks.

In this embodiment, the pressure regulating device further comprises a plurality of pressure regulating needle valves (12, 46 and 54 in fig. 2) for regulating the pressure of the test system, wherein the pressure regulating needle valves are respectively arranged at the output end of the air inlet buffer tank, the output end of the exhaust buffer tank and the output end of the second flow monitoring unit.

Thus, the pressure regulation of the test system can be achieved by changing the opening degree of the pressure regulating needle valve (12, 46, 54 in fig. 2) to regulate the back pressure in the system during the test.

Specifically, the pressure regulating needle valve 12 regulates the flow and pressure before the hydrogen circulation pump is supplied with air, the pressure regulating needle valve 46 regulates the flow and pressure after the hydrogen circulation pump is discharged with air, and the pressure regulating needle valve 54 regulates the flow of the main loop.

In this embodiment, the hydrogen circulation pump 37 is electrically connected to a power analyzer.

In the test system, most pipelines adopt 316L stainless steel hard tube, include: the system comprises an air inlet pipeline, a main loop pipeline, a first vent pipeline, a first liquid discharge pipeline, a second liquid discharge pipeline and a third liquid discharge pipeline, wherein the air inlet pipeline is connected with an air source, a hydrogen source and a nitrogen source and enters the main loop; the connection part of the inlet and the outlet of the hydrogen circulating pump needs to be frequently disassembled and replaced in model, and two sections of metal hoses (33 and 40 in figure 2) with polytetrafluoroethylene linings and a woven stainless steel outer bag are adopted for connection. All the outer surfaces of the pipelines are laid with rubber and plastic heat-insulating layers, so that the heat loss under the heating working condition is reduced, and the scalding caused by manual contact is prevented.

In the test system, the ball valve is mainly used for cutting off, distributing and changing the flow direction of a medium, the needle valve is mainly used for adjusting the pressure and the flow of gas, the safety valve is used as an overpressure protection device, and the check valve is mainly used for blocking the backflow of the gas.

The data acquisition unit comprises but is not limited to a first data acquisition unit, a second data acquisition unit, a third data acquisition unit and a fourth data acquisition unit, the data acquisition units are input into the master control unit according to sensor signals in the test system, and an acquisition module in the data acquisition units is connected with a computer to display measurement acquisition results in real time. Specifically, the data acquisition unit includes temperature sensors (29, 34, 39, 50 in fig. 2) and digital display meters thereof, pressure sensors (30, 35, 38, 51 in fig. 2) and digital display meters thereof, a humidity sensor 36 and digital display meters thereof, a gas detector, a power analyzer, and a data acquisition card, and the total control unit is a computer. Each sensor is a voltage type or current type sensor and is connected with the data acquisition card; the gas detector is a hydrogen-nitrogen-air composite gas detector, and can detect the gas components and content in the test system on line in real time; the data acquisition card is used for receiving and converting acquired signals, and can realize real-time data display, acquisition and storage of the measurement and acquisition system by combining with each sensor, the gas detector, the power analyzer and the computer.

Of course, the test system also includes a power supply and distribution system and a stand support. The power supply and distribution system provides and distributes corresponding power supplies for all the electric equipment of the performance test system and controls the electric equipment, and mainly comprises an explosion-proof power distribution cabinet, an explosion-proof adjustable direct current power supply and the like. The rack support mainly comprises 4040 aluminum profiles and accessories thereof, and can provide support and fixing effects for the systems and the equipment thereof after being assembled as required.

1. In carrying out the open test:

closing the ball valves 8, 11, 16, 17, 19, 21, 22, 25, 27, 45, 47, 48 and 57, opening the ball valves 6, 7, 13, 15, 18, 23, 26, 32, 53, 56, 58, 59, 12, 28, 46, 49 and 54, starting the gas source 2 and the hydrogen manifold 3 after the pipeline purging is completed, starting the hydrogen circulating pump 37, introducing hydrogen into the heater 14 via the inlet buffer tank 10 for inlet temperature adjustment, then adjusting humidity via the steam-water separator 24 and 20, measuring inlet flow, temperature, pressure and humidity in the inlet pipeline of the hydrogen circulating pump, introducing hydrogen into the hydrogen circulating pump 37 via the front pipeline of the hydrogen circulating pump, compressing hydrogen in the hydrogen circulating pump 37, introducing compressed hydrogen into the rear pipeline of the hydrogen pump, measuring the temperature and pressure of the compressed hydrogen by the pressure sensor 38 and 39, measuring the input power of the controller of the hydrogen circulating pump 37, outputting power, voltage, current, etc. of the hydrogen, discharging the hydrogen from the humidifier via the inlet pipe 52, discharging the hydrogen from the humidifier 52, and discharging the gas from the detector 52.

2. In the closed test:

the ball valve 57 is opened, the

ball valves

58 and 59 are closed, the states of the other valves are the same as those of the opened valves, and the working process of the valves is consistent with that of the opened valves, wherein the difference is that the opened valves are opened for discharging hydrogen gas, and the closed valves are hydrogen gas recycled through the ball valve 57.

3. When the gas composition is adjusted:

(1) Closing ball valve 6, ball valve 8, ball valve 11, ball valve 16, ball valve 17, ball valve 19, ball valve 21, ball valve 22, ball valve 25, ball valve 27, ball valve 45, ball valve 47, ball valve 48, ball valve 56, ball valve 57 and ball valve 58, opening ball valve 7, ball valve 13, ball valve 15, ball valve 18, ball valve 23, ball valve 26, ball valve 32, ball valve 53, ball valve 59, needle valve 12, needle valve 28, needle valve 46, needle valve 49 and needle valve 54. The valve of the nitrogen cylinder 1 and the valve of the hydrogen cylinder 2 are opened.

(2) And opening the nitrogen busbar 4 and adjusting the outlet pressure of the nitrogen to be the required pressure a, and opening the hydrogen busbar 3 and adjusting the outlet pressure of the hydrogen to be a r, wherein r is the volume fraction ratio of the hydrogen to the nitrogen.

(3) The hydrogen circulation pump 37 is turned on and maintained in a low rotation state.

(4) The ball valve 58, the ball valve 56 and the ball valve 6 are opened in sequence, and then the timing is started.

(5) And (4) observing the content of each gas in the gas detector, and ending timing after the volume fraction ratio of the hydrogen to the nitrogen to be displayed is r and is maintained for half a minute.

(6) And immediately and sequentially closing the ball valve 58 and the ball valve 56, and sequentially closing the hydrogen circulating pump 37 and the ball valve 6 when the pressure in the system is stabilized to a, and keeping for 2-3 min under a stable pressure.

(7) Repeating the processes (3) to (6) for 2-5 times, and referring to the first inflation timing time after timing is finished (the pressure stabilizing stay in the step (6) and the step (6) is omitted in blind pipeline replacement for 2-3 min).

(8) After the replacement for many times is completed, the hydrogen cylinder valve of the hydrogen inlet pipe, the first bus bar 3, the hydrogen cylinder valve of the nitrogen inlet pipe and the second bus bar 4 are closed. The performance test of the mixed gas can be carried out by adjusting the system to a closed test state.

4. When pressure adjustment is performed:

the pressure of the gas entering the test system is adjusted through a primary pressure reducing valve 66 and a secondary pressure reducing valve 67 on the gas source and the busbar, the real-time measurement results of the inlet pressure sensor 35 and the outlet pressure sensor 38 are combined, and then the back pressure in the test system is adjusted through changing the opening degrees of the needle valve 12, the needle valve 46 and the needle valve 54 to achieve pressure adjustment of the test system.

5. When the intake air humidity is adjusted:

when the humidity needs to be adjusted in a performance test of the hydrogen circulating pump, the

ball valves

18, 23 and 26 are opened, the ball valves 17 and 22 are closed, and when gas entering the test system passes through the humidifier 20 and the steam-water separator 24, the humidity of the gas entering the hydrogen circulating pump 37 is controlled by changing the liquid level of the humidifier 20 according to the real-time measurement result of the humidity sensor 36. When humidity adjustment is not needed in the test, the ball valve 17 is opened, the

ball valves

18, 23 and 26 are closed, and the gas flows through the bypass.

6. When the intake air temperature is adjusted:

when the inlet air temperature needs to be adjusted in a performance test of the hydrogen circulating pump, the ball valve 13 and the ball valve 15 are opened, the ball valve 16 is closed, and when the gas entering the test system passes through the heater 14, the temperature of the gas entering the hydrogen circulating pump 37 is controlled by changing the heating power of the heater 14 according to the real-time measurement result of the inlet temperature sensor 34. When the temperature adjustment is not needed in the test, the ball valve 16 is opened, the ball valves 13 and 15 are closed, and the gas flows through the bypass.

7. Test method

7.1 preparation of the test

(1) And (4) checking a test bed and a power supply and distribution system of the hydrogen circulating pump test platform, and eliminating the hidden danger of looseness of each interface.

(2) And turning on a main power switch, adjusting each power switch of the electrical control system to enable the control electricity and the instrument to be electrically turned on and the power electricity to be turned off, turning on each measuring and detecting device and debugging to a normal working state.

(3) And opening the power electric switch, and replacing the gas in the test system with nitrogen.

(4) And the nitrogen in the replacement system is hydrogen or mixed gas of hydrogen and nitrogen, and the preparation work is finished.

7.2 testing

(1) The hydrogen circulation pump 37 is turned on and maintained in a low rotation state, and then the system is adjusted to an open state or a closed circulation state.

(2) And adjusting the test conditions according to the gas components, the inlet air pressure, the temperature and the humidity according to the test contents.

(3) After the test working condition is adjusted, the upper computer controls the rotating speed of the hydrogen circulating pump, and when the hydrogen circulating pump reaches a stable operation state or a dynamic quasi-stable operation state, test parameter acquisition and storage are started. The acquisition system can respectively acquire parameters such as flow, pressure, temperature, inlet humidity and gas composition of an inlet and an outlet of the hydrogen circulating pump, and parameters such as input and output power, voltage and current of the hydrogen circulating pump controller obtained by combining the power analyzer.

(4) And (3) designing a test working condition table according to a single variable principle, and repeating the steps (2) and (3) to test the performance of each hydrogen circulating pump under different variable working conditions.

7.3 end of test

(1) The condition adjusting devices such as the heater 14 and the humidifier 20 are turned off.

(2) The gas in the replacement test system is nitrogen; then the liquid discharge pipeline is opened to discharge liquid water and then closed.

(3) And (4) turning off the power supply of each measuring device, turning off the power supply, the control power and the instrument electric switch, and turning off the main power switch.

(4) And checking whether the test loop of the hydrogen circulating pump and each device are intact, and arranging the rack to complete the test.

Finally, it should be noted that: various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims

1. A performance test system for a hydrogen circulating pump of a hydrogen fuel cell is characterized by comprising a test gas supply unit, wherein the test gas supply unit is sequentially connected with an air inlet buffer tank, a working condition control unit, a first flow monitoring unit, a first data acquisition unit, the hydrogen circulating pump, a second data acquisition unit, an exhaust buffer tank and a second flow monitoring unit through pipelines; the gas inlet buffer tank, the working condition control unit, the first flow monitoring unit, the first data acquisition unit, the hydrogen circulating pump, the second data acquisition unit, the exhaust buffer tank and the second flow monitoring unit form a main loop through pipelines, a first bypass unit is arranged on a parallel link of the working condition control unit, a second bypass unit and an exhaust oil content detection unit are arranged on a parallel link of the second flow monitoring unit, and the second bypass unit and the exhaust oil content detection unit are arranged in series; a third bypass unit is arranged on a parallel link of the first flow monitoring unit; the test device comprises a first flow monitoring unit, a second flow monitoring unit, a gas inlet buffer tank, a main loop, a third valve, a second valve, a third valve, a fourth valve, a fifth valve and a sixth valve, wherein the first valve is arranged on a pipeline between the output end of the first flow monitoring unit and the input end of the gas inlet buffer tank in sequence;

the air supply unit is used for providing air for the test system;

the working condition control unit is used for providing different humitures for the gas entering the hydrogen circulating pump so as to simulate the gas inlet working condition of the hydrogen circulating pump;

the exhaust oil content detection unit is used for detecting the oil content of the gas exhausted from the exhaust buffer tank;

the testing system also comprises a power supply and distribution system for providing power for the testing system and a master control unit for controlling the testing system.

2. The performance test system of the hydrogen circulation pump of the hydrogen fuel cell according to claim 1, wherein the test gas supply unit comprises a hydrogen supply unit and a nitrogen supply unit, wherein the hydrogen supply unit comprises a hydrogen source, a first bus bar and an electromagnetic valve which are sequentially connected through a pipeline, the nitrogen supply unit comprises a nitrogen source and a second bus bar which are sequentially connected through a pipeline, and the output end of the second bus bar and one end of the electromagnetic valve are jointly connected with the first valve; the air supply unit comprises an air source and a first ball valve, and the output end of the air source is connected with the input end of the air inlet buffer tank through the first ball valve.

3. The performance testing system of a hydrogen circulation pump of a hydrogen fuel cell according to claim 2, wherein the first and second busbars respectively comprise a gas cylinder connector, and a first check valve, a filter, a primary pressure reducing valve, a secondary pressure reducing valve, and a second ball valve connected to the gas cylinder connector in sequence through a pipeline, and gas flows to the filter through the gas cylinder connector and the first check valve, and further comprise a safety valve and a first needle valve connected in parallel, one end of a parallel link of the safety valve and the first needle valve is arranged on the pipeline between the secondary pressure reducing valve and the second ball valve, and the other end of the parallel link of the safety valve and the first needle valve is communicated with the atmosphere through a second vent pipeline, and the gas cylinder connector is connected to the hydrogen source or the nitrogen source.

4. The performance test system of the hydrogen circulating pump of the hydrogen fuel cell according to claim 1, wherein the working condition control unit comprises a temperature control unit and a humidity control unit, the output end of the air inlet buffer tank is sequentially connected with the temperature control unit, the humidity control unit and the first flow monitoring unit through pipelines, the temperature control unit comprises a heater, the input end and the output end of the heater are respectively provided with a third ball valve, the humidity control unit comprises a humidifier and a steam-water separator, the humidifier and the steam-water separator are sequentially connected with the heater through pipelines, the input end and the output end of the humidifier are respectively provided with a fourth ball valve, and the output end of the steam-water separator is provided with a fifth ball valve.

5. The performance test system of the hydrogen circulating pump of the hydrogen fuel cell according to claim 4, wherein the first bypass unit comprises a sixth ball valve, a seventh ball valve and an eighth ball valve, two ends of the sixth ball valve are respectively connected with one end of the third ball valve, which is far away from the heater, one end of the seventh ball valve is communicated with a pipeline between the adjacent third ball valve and the fourth ball valve, the other end of the seventh ball valve is communicated with one end of the fifth ball valve, which is far away from the steam-water separator, one end of the eighth ball valve is communicated with one end of the fourth ball valve, which is far away from the steam-water separator, and the other end of the eighth ball valve is communicated with one end of the fifth ball valve, which is far away from the steam-water separator;

6. The performance test system of the hydrogen circulating pump of the hydrogen fuel cell according to claim 4, wherein the first flow monitoring unit comprises a second needle valve, one end of the second needle valve is connected with one end of the fifth ball valve, which is far away from the steam-water separator, the other end of the second needle valve is sequentially connected with a first flow sensor and a ninth ball valve through a pipeline, and a third data acquisition unit is further arranged on the pipeline between the second needle valve and the first flow sensor;

7. The performance test system for the hydrogen circulation pump of the hydrogen fuel cell according to claim 1, wherein the first data acquisition unit, the second data acquisition unit, the third data acquisition unit and the fourth data acquisition unit each comprise a temperature sensor, a thermometer, a pressure gauge and a pressure sensor, and the first data acquisition unit further comprises a humidity sensor and a hygrometer.

8. The performance test system of the hydrogen circulation pump of the hydrogen fuel cell as claimed in claim 1, further comprising a safety protection unit, wherein the safety protection unit comprises a flame arrester, a combustible gas detector, an audible and visual alarm, a safety valve, a ground protection and an electromagnetic valve in the hydrogen supply unit, the flame arrester is respectively arranged on a first vent pipeline and a total vent pipeline of the exhaust buffer tank, the safety valve is arranged between the first vent pipeline of the exhaust buffer tank and the corresponding flame arrester, a second check valve for allowing gas to flow from a fourth valve to the flame arrester is arranged between the flame arrester on the total vent pipeline and one end of the fourth valve far from the third valve, one end of the sixth valve far from the gas detector is connected with an input end of the second check valve on the total vent pipeline, the input end of the exhaust buffer tank is provided with a third check valve for allowing gas to flow from the second data acquisition unit to the exhaust buffer tank, the ground protection cable is used for grounding the test system, the combustible gas detector is arranged in a laboratory where the test system is located, and the audible and visual detectors and the electromagnetic valve are connected with the control system.

9. The performance test system of the hydrogen circulation pump of the hydrogen fuel cell of claim 1, further comprising pressure adjusting needle valves for adjusting the pressure of the test system, wherein the pressure adjusting needle valves are respectively arranged at the output end of the air inlet buffer tank, the output end of the exhaust buffer tank and the output end of the second flow monitoring unit.

10. The performance test system for the hydrogen circulation pump of the hydrogen fuel cell according to claim 1, wherein the hydrogen circulation pump is connected with a power analyzer.