Cold start hydrogen circulating pump icing test system and test method

Abstract

The invention relates to the technical field of fuel cells, in particular to a cold start hydrogen circulating pump icing test system and test method, and the cold start hydrogen circulating pump icing test system comprises a gas supply device and a water supply device; the nozzle is communicated with the air supply device and the water supply device; the temperature and humidity of the environment box can be adjusted, a hydrogen circulating pump is arranged in the environment box, an outlet of the nozzle is communicated with an inlet of the hydrogen circulating pump, and a nitrogen and water discharging valve is integrated at an outlet of the hydrogen circulating pump; the angle adjusting device is fixedly arranged in the environment box, and the hydrogen circulating pump is arranged on the angle adjusting device; and the back pressure valve is communicated with a pressure relief opening of the hydrogen circulating pump. According to the method, it can be guaranteed that the icing test of the hydrogen circulating pump is not affected by seasons and areas, resources of the whole vehicle do not need to be occupied, and icing can be rapidly determined when the icing occurs.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to an icing test system and a test method for a cold-start hydrogen circulation pump. Background Art

[0002] In fuel cells, the hydrogen circulation pump plays a very important role. The hydrogen circulation pump can provide gas with a certain pressure rise and flow rate, which is used to circulate the gas at the anode outlet back to the anode inlet and re-enter the fuel cell stack in the fuel-electric system. Therefore, the performance of the hydrogen circulation pump determines whether the fuel cell can work effectively.

[0003] When conducting a cold start hydrogen circulation pump icing verification test on a fuel cell vehicle, it cannot be verified at any time due to season and region restrictions. It can only be conducted in cold winter and specific areas. In addition, the verification environment and operating environment are not sufficient. It cannot always simulate the harsh verification of the environment at extremely low temperatures, which can easily lead to inadequate verification. Moreover, when a cold start fails and the hydrogen circulation pump has an icing problem, the fuel cell system and the surrounding parts of the vehicle need to be disassembled, which takes a long time. Not only does it take up system and vehicle resources for a long time, resulting in waste of resources and increased labor costs, but also because of the long disassembly time, the freezing point of the hydrogen circulation pump melts and the icing problem point of the hydrogen circulation pump cannot be found. When conducting a cold start hydrogen circulation pump icing verification on a system bench, the tilt angle of the vehicle cannot be simulated, and thus the cold start icing of the hydrogen circulation pump at different tilt angles cannot be tested.

[0004] Therefore, a cold start hydrogen circulation pump icing test system and test method are needed to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a cold start hydrogen circulation pump icing test system and test method, which can ensure that the icing test of the hydrogen circulation pump is not affected by seasons and regions, does not need to occupy the resources of the whole vehicle and the system bench, can quickly determine when icing occurs, and can simulate different inclination angle conditions.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Cold start hydrogen circulation pump icing test system, including:

[0008] Gas and water supply devices;

[0009] A nozzle, the nozzle being in communication with both the air supply device and the water supply device;

[0010] An environmental box, wherein the temperature and humidity of the environmental box can be adjusted, a hydrogen circulation pump is arranged in the environmental box, the outlet of the nozzle is communicated with the inlet of the hydrogen circulation pump, and a nitrogen drainage valve is integrated at the outlet of the hydrogen circulation pump;

[0011] An angle adjustment device, the angle adjustment device is fixedly arranged in the environmental box, the hydrogen circulation pump is arranged on the angle adjustment device, and the angle adjustment device can adjust the angle between the hydrogen circulation pump and the horizontal plane;

[0012] A back pressure valve is connected to the pressure relief port of the hydrogen circulation pump, and the back pressure valve is used to set the pressure of the hydrogen circulation pump.

[0013] Furthermore, it also includes a power supply and a controller, the power supply is electrically connected to the controller, and the controller is electrically connected to the hydrogen circulation pump.

[0014] Furthermore, a humidifier and a temperature regulator are provided in the environmental box, and both the humidifier and the temperature regulator are electrically connected to the controller.

[0015] Furthermore, the environmental box is provided with a temperature display and a humidity display.

[0016] Furthermore, a first switch valve is provided at the inlet of the hydrogen circulation pump, and a second switch valve is provided at the outlet of the hydrogen circulation pump, and the second switch valve is located downstream of the nitrogen and water exhaust valve.

[0017] Furthermore, it also includes a return air pipeline, one end of which is connected to the back pressure valve, and the other end of which is connected to the inlet of the nozzle.

[0018] Furthermore, it also includes a tail discharge component, which is communicated with the nitrogen and water discharge valve.

[0019] Furthermore, the angle adjustment device includes a first cylinder and a second cylinder, the first cylinder and the second cylinder are both fixedly arranged in the environmental box, and the piston rod of the first cylinder and the piston rod of the second cylinder are both hinged to the hydrogen circulation pump.

[0020] Furthermore, the hydrogen circulation pump is provided with an inclination display for displaying the inclination angle of the hydrogen circulation pump relative to the horizontal plane.

[0021] The test method uses the cold start hydrogen circulation pump icing test system as described above to test the hydrogen circulation pump, including the following steps:

[0022] S1. Place the hydrogen circulation pump in an environmental box, adjust the hydrogen circulation pump to a set angle using an angle adjustment device, and set the pressure of the hydrogen circulation pump using a back pressure valve;

[0023] S2, setting the temperature and humidity in the environmental box, and freezing the hydrogen circulation pump in the environmental box to a preset temperature;

[0024] S3, start the gas supply device and the water supply device to supply water and gas to the gas supply device and the water supply device through the nozzle at a set flow rate, and at the same time start the hydrogen circulation pump and the nitrogen and water discharge valve to run for a first set time;

[0025] S4, turning off the hydrogen circulation pump and the water supply device, and continuing to supply gas for purge operation for a second set time;

[0026] S5, closing the nitrogen drain valve and the gas supply device, and cooling the hydrogen circulation pump in the environmental box for a third set time;

[0027] S6. Open the nitrogen drain valve and the gas supply device, start the hydrogen circulation pump at the set speed, and if it is successfully started, record the starting time and starting current; if it is not successfully started, disassemble the hydrogen circulation pump to determine the freezing point.

[0028] Beneficial effects of the present invention:

[0029] A cold start hydrogen circulation pump icing test system provided by the present invention, the air supply device and the water supply device are both connected to the nozzle, the nozzle is connected to the hydrogen circulation pump arranged in the environmental box, the hydrogen circulation pump is integrated with a nitrogen drainage valve, an angle adjustment device is arranged in the environmental box, the hydrogen circulation pump is arranged on the angle adjustment device, and the back pressure valve is connected to the hydrogen circulation pump to control the pressure of the hydrogen circulation pump. By adjusting the temperature and humidity in the environmental box, the operation of the hydrogen circulation pump under different temperatures and humidities can be simulated, and the icing test of the hydrogen circulation pump can be ensured to be not affected by the season and region, and can be measured at any time; the angle adjustment device can be used to adjust the inclination of the hydrogen circulation pump relative to the horizontal plane, thereby simulating the operating state of the hydrogen circulation pump at different inclination angles. The hydrogen circulation pump is tested by this cold start hydrogen circulation pump icing test system without occupying the resources of the whole vehicle and the system bench. When icing occurs, it can be quickly determined, and the cold start hydrogen circulation pump icing test can be effectively carried out smoothly.

[0030] A testing method provided by the present invention adopts the cold start hydrogen circulation pump icing test system as described above to test the hydrogen circulation pump, which can ensure that the icing test of the hydrogen circulation pump is not affected by seasons and regions, does not need to occupy the resources of the whole vehicle and the system test bench, and can quickly determine when icing occurs, and can simulate different inclination angle conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of a cold start hydrogen circulation pump icing test system of the present invention;

[0032] Figure 2It is a schematic diagram of an angle adjustment device in an icing test system of a cold start hydrogen circulation pump of the present invention;

[0033] Figure 3 It is a flow chart of a testing method of the present invention.

[0034] In the figure:

[0035] 1. Air supply device; 2. Water supply device; 3. Nozzle; 4. Environmental chamber; 41. Humidifier; 42. Temperature regulator; 43. Temperature display; 44. Humidity display; 5. Hydrogen circulation pump; 51. Nitrogen exhaust and water discharge valve; 6. Back pressure valve; 61. Return air pipeline; 7. Tail exhaust parts; 8. Power supply; 81. Controller; 9. Angle adjustment device; 91. First cylinder; 92. Second cylinder. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and implementation methods. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In the cold start icing test of the hydrogen circulation pump of the fuel cell system, in order to ensure that the icing test of the hydrogen circulation pump is not affected by seasons and regions, it does not need to occupy the resources of the whole vehicle and the system bench. When icing occurs, it can be quickly determined, and different inclination conditions can be simulated, such as Figure 1-Figure 2As shown, the present invention provides a cold start hydrogen circulation pump icing test system. The cold start hydrogen circulation pump icing test system comprises an air supply device 1, a water supply device 2, a nozzle 3, an environmental chamber 4, an angle adjustment device 9 and a back pressure valve 6.

[0040] The nozzle 3 is connected to the gas supply device 1 and the water supply device 2; the temperature and humidity of the environmental box 4 can be adjusted, and a hydrogen circulation pump 5 is provided in the environmental box 4. The outlet of the nozzle 3 is connected to the inlet of the hydrogen circulation pump 5. A nitrogen discharge valve 51 is integrated at the outlet of the hydrogen circulation pump 5. The gas enters the hydrogen circulation pump 5 from the nozzle 3 and is discharged through the nitrogen discharge valve 51. The angle adjustment device 9 is fixedly arranged in the environmental box 4, and the hydrogen circulation pump 5 is arranged on the angle adjustment device 9. The angle adjustment device 9 can adjust the angle between the hydrogen circulation pump 5 and the horizontal plane; the back pressure valve 6 is connected to the pressure relief port of the hydrogen circulation pump 5, and the back pressure valve 6 is used to set the pressure of the hydrogen circulation pump 5.

[0041] By adjusting the temperature and humidity in the environmental box 4, the operation of the hydrogen circulation pump 5 under different temperatures and humidities can be simulated, and the icing test of the hydrogen circulation pump 5 can be ensured to be unaffected by seasons and regions, and can be measured at any time; the angle adjustment device 9 can be used to adjust the inclination of the hydrogen circulation pump 5 relative to the horizontal plane, thereby simulating the operation state of the hydrogen circulation pump 5 at different inclinations. The hydrogen circulation pump 5 can be tested by the cold start hydrogen circulation pump icing test system without occupying the resources of the whole vehicle and the system bench. When icing occurs, it can be quickly determined, and the cold start hydrogen circulation pump 5 icing test can be effectively carried out smoothly.

[0042] Furthermore, the cold start hydrogen circulation pump icing test system also includes a power supply 8 and a controller 81, the power supply 8 is electrically connected to the controller 81, and the controller 81 is electrically connected to the hydrogen circulation pump 5. By setting the controller 81, it is convenient to control the start and stop and the speed of the hydrogen circulation pump 5. In this embodiment, the back pressure valve 6 is air-to-air, and the back pressure valve 6 is electrically connected to the controller 81. The pressure parameters of the back pressure valve 6 can be set by the controller 81, so that the pressure of the hydrogen circulation pump 5 can be quickly adjusted as needed.

[0043] Furthermore, a humidifier 41 and a temperature regulator 42 are provided in the environmental box 4, and both the humidifier 41 and the temperature regulator 42 are electrically connected to the controller 81. The humidifier 41 and the temperature regulator 42 can be controlled by the controller 81, so that the temperature and humidity in the environmental box 4 can be adjusted according to the needs of the test. Different temperatures and humidities can be set according to actual needs, and different environments can be fully simulated. The cooling and freezing of the hydrogen circulation pump 5 under different temperatures and humidities can be tested.

[0044] Furthermore, the environmental box 4 is provided with a temperature display 43 and a humidity display 44. By providing the temperature display 43 and the humidity display 44, the temperature and humidity in the environmental box 4 can be displayed intuitively, so that the tester can observe and set the temperature and humidity in the environmental box 4 conveniently.

[0045] Furthermore, a first switch valve is provided at the inlet of the hydrogen circulation pump 5, and a second switch valve is provided at the outlet of the hydrogen circulation pump 5, and the second switch valve is connected in series with the nitrogen drainage valve 51 and is located downstream of the nitrogen drainage valve 51. Through the above arrangement, when the hydrogen circulation pump 5 is frozen, the first switch valve and the second switch valve are closed to avoid the influence of external water vapor on the hydrogen circulation pump 5, thereby ensuring the smooth progress of the test work and the accuracy of the test data. Moreover, during the test process, if the hydrogen circulation pump 5 fails, the gas path can be quickly cut off by the first switch valve and the second switch valve to avoid accidents.

[0046] Furthermore, the cold start hydrogen circulation pump icing test system also includes a return air pipeline 61, one end of which is connected to the back pressure valve 6, and the other end of which is connected to the inlet of the nozzle 3. By providing the return air pipeline 61, the pressurized high-pressure gas can be refilled into the hydrogen circulation pump 5 to replenish the gas of the gas supply device 1. In order to prevent the gas of the gas supply device 1 from directly acting on the back pressure valve 6 through the return air pipeline 61, a one-way valve is provided on the return air pipeline 61, the air inlet of the one-way valve is connected to the back pressure valve 6, and the air outlet of the one-way valve is connected to the air inlet of the nozzle 3.

[0047] Furthermore, the cold start hydrogen circulation pump icing test system further includes a tail discharge piece 7, which is connected to the nitrogen discharge valve 51. By providing the tail discharge piece 7, it is convenient to discharge water and gas in the hydrogen circulation pump 5. Since there is hydrogen in the gas, after being discharged through the tail discharge piece 7, the gas needs to be processed or recovered later.

[0048] Furthermore, the angle adjustment device 9 includes a first cylinder 91 and a second cylinder 92, the first cylinder 91 and the second cylinder 92 are both fixedly arranged in the environmental box 4, and the piston rod of the first cylinder 91 and the piston rod of the second cylinder 92 are both hinged to the hydrogen circulation pump 5. When adjusting the inclination angle of the hydrogen circulation pump 5, the purpose of controlling the inclination angle of the cleaning circulation pump can be achieved by controlling the different extension lengths of the piston rod of the first cylinder 91 and the piston rod of the second cylinder 92. In other embodiments, two linear motors or connecting rod mechanisms can also be used as the angle adjustment device 9, and no excessive restrictions are made here.

[0049] Furthermore, the hydrogen circulation pump 5 is provided with an inclination display for displaying the inclination angle of the hydrogen circulation pump 5 relative to the horizontal plane. The inclination display displays the inclination angle of the hydrogen circulation pump 5 in real time, so that the tester can know whether the inclination adjustment is in place at any time.

[0050] like Figure 3 As shown, this embodiment also provides a test method, using the above cold start hydrogen circulation pump icing test system to test the hydrogen circulation pump 5, including the following steps:

[0051] S1. Place the hydrogen circulation pump 5 in the environmental box 4, and use the angle adjustment device 9 to adjust the hydrogen circulation pump 5 to a set angle, and use the back pressure valve 6 to set the pressure of the hydrogen circulation pump 5;

[0052] S2, setting the temperature and humidity in the environmental box 4, and freezing the hydrogen circulation pump 5 to a preset temperature in the environmental box 4;

[0053] S3, start the gas supply device 1 and the water supply device 2 to supply water and gas to the gas supply device 1 and the water supply device 2 through the nozzle 3 at a set flow rate, and at the same time open the first switch valve, the second switch valve, the hydrogen circulation pump 5 and the nitrogen and water discharge valve 51 to run for a first set time;

[0054] S4, turning off the hydrogen circulation pump 5 and the water supply device 2, and continuing to supply gas for the purge operation for the second set time;

[0055] S5, close the nitrogen drain valve 51 and the gas supply device 1, and close the first switch valve and the second switch valve at the same time, and cool the hydrogen circulation pump 5 in the environmental box 4 for a third set time;

[0056] S6. Open the first switch valve, the second switch valve, the nitrogen and water discharge valve 51 and the gas supply device 1, and start the hydrogen circulation pump 5 at the set speed. If it starts successfully, record the starting time and starting current. If it does not start successfully, disassemble the hydrogen circulation pump 5 to determine the freezing point.

[0057] The placement angle of the hydrogen circulation pump 5 in the environmental box 4 can be adjusted according to the tilt angle of the whole vehicle; the setting conditions of the environmental box 4 are not restricted and are set according to the actual required time; the starting speed, purge time, and opening and closing frequency of the nitrogen exhaust valve 51 of the hydrogen circulation pump 5 are not restricted and are adjusted and set according to the control strategy; the water volume of the nozzle 3 is not restricted and is adjusted and set according to the actual test needs.

[0058] During the test, there is no need to resort to system bench testing and vehicle verification. Only simple equipment and an environmental chamber 4 are needed to fully verify the cold start freezing verification of the hydrogen circulation pump 5 of the fuel cell system; and the maximum operating conditions and operating environment (pressure, temperature, humidity, operating conditions) of the entire vehicle can be fully simulated to make the verification more thorough.

[0059] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Cold start hydrogen circulation pump icing test system, characterized in that: include: An air supply device (1) and a water supply device (2); A nozzle (3), wherein the nozzle (3) is connected to the air supply device (1) and the water supply device (2); An environmental box (4), wherein the temperature and humidity of the environmental box (4) are adjustable, a hydrogen circulation pump (5) is arranged in the environmental box (4), an outlet of the nozzle (3) is connected to an inlet of the hydrogen circulation pump (5), and a nitrogen discharge valve (51) is integrated at the outlet of the hydrogen circulation pump (5); An angle adjustment device (9), the angle adjustment device (9) is fixedly arranged in the environmental box (4), the hydrogen circulation pump (5) is arranged on the angle adjustment device (9), and the angle adjustment device (9) can adjust the angle between the hydrogen circulation pump (5) and the horizontal plane; A back pressure valve (6), the back pressure valve (6) is connected to the pressure relief port of the hydrogen circulation pump (5), and the back pressure valve (6) is used to set the pressure of the hydrogen circulation pump (5).

2. The cold start hydrogen circulation pump icing test system according to claim 1, characterized in that: It also includes a power supply (8) and a controller (81), wherein the power supply (8) is electrically connected to the controller (81), and the controller (81) is electrically connected to the hydrogen circulation pump (5).

3. The cold start hydrogen circulation pump icing test system according to claim 2, characterized in that: The environmental box (4) is provided with a humidifier (41) and a temperature regulator (42), and the humidifier (41) and the temperature regulator (42) are both electrically connected to the controller (81).

4. The cold start hydrogen circulation pump icing test system according to claim 1, characterized in that: The environmental box (4) is provided with a temperature display (43) and a humidity display (44).

5. The cold start hydrogen circulation pump icing test system according to claim 1, characterized in that: A first switch valve is provided at the inlet of the hydrogen circulation pump (5), and a second switch valve is provided at the outlet of the hydrogen circulation pump (5), wherein the second switch valve is located downstream of the nitrogen and water discharge valve (51).

6. The cold start hydrogen circulation pump icing test system according to claim 1, characterized in that: It also comprises an air return pipeline (61), one end of which is in communication with the back pressure valve (6), and the other end of which is in communication with the inlet of the nozzle (3).

7. The cold start hydrogen circulation pump icing test system according to claim 1, characterized in that: It also comprises a tail discharge component (7), wherein the tail discharge component (7) is in communication with the nitrogen and water discharge valve (51).

8. The cold start hydrogen circulation pump icing test system according to claim 1, characterized in that: The angle adjustment device (9) comprises a first cylinder (91) and a second cylinder (92), wherein the first cylinder (91) and the second cylinder (92) are both fixedly arranged in the environmental box (4), and the piston rod of the first cylinder (91) and the piston rod of the second cylinder (92) are both hinged to the hydrogen circulation pump (5).

9. The cold start hydrogen circulation pump icing test system according to claim 1 or 8, characterized in that: The hydrogen circulation pump (5) is provided with an inclination display for displaying the inclination angle of the hydrogen circulation pump (5) relative to the horizontal plane.

10. A test method, characterized in that The cold start hydrogen circulation pump icing test system according to any one of claims 1 to 9 is used to test the hydrogen circulation pump (5), comprising the following steps: S1. Place the hydrogen circulation pump (5) in the environmental box (4), adjust the hydrogen circulation pump (5) to a set angle using an angle adjustment device (9), and set the pressure of the hydrogen circulation pump (5) using a back pressure valve (6); S2, setting the temperature and humidity in the environmental box (4), and freezing the hydrogen circulation pump (5) to a preset temperature in the environmental box (4); S3, opening the gas supply device (1) and the water supply device (2) to supply water and gas to the gas supply device (1) and the water supply device (2) through the nozzle (3) at a set flow rate, and at the same time opening the hydrogen circulation pump (5) and the nitrogen and water discharge valve (51) to operate for a first set time; S4, turning off the hydrogen circulation pump (5) and the water supply device (2), and continuing to supply gas for the purge operation for a second set time; S5, closing the nitrogen drain valve (51) and the gas supply device (1), and cooling the hydrogen circulation pump (5) in the environmental box (4) for a third set time; S6. Open the nitrogen discharge valve (51) and the gas supply device (1), start the hydrogen circulation pump (5) at the set speed, and if it is successfully started, record the starting time and starting current; if it is not successfully started, disassemble the hydrogen circulation pump (5) to determine the freezing point.

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