Airtightness testing device for fuel cell system

Abstract

The utility model relates to the technical field of air tightness testing, and discloses an air tightness testing device for a fuel cell system, which comprises a pressure fluid source, the pressure fluid source is connected with a pressure control component in series, the pressure control component is controllably communicated with a plurality of chambers of a gas-electricity system through a first air inlet pipe group, and the plurality of chambers of the gas-electricity system are connected with a second air inlet pipe group. The end, connected with cavities of the gas-electricity system, of the second gas inlet pipe set is communicated with the first gas inlet pipe set, the end, connected with the pressure control component, of the first gas inlet pipe set is connected with a first electromagnetic valve, the first electromagnetic valve is controllably communicated with the cavities of the gas-electricity system through the second gas inlet pipe set, and a flow meter is connected between the second gas inlet pipe set and the first electromagnetic valve. The end, connected with the second air inlet pipe set, of the first electromagnetic valve communicates with the environment without air flowing through the second electromagnetic valve. According to the utility model, various test data can be accurately obtained, a complex emptying valve is omitted, the structure is simple, and the test cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of air tightness testing, in particular to an air tightness testing device for a fuel cell system. Background Art

[0002] Fuel cells, particularly proton exchange membrane fuel cells, have become a hot topic and a key focus of development in the energy and power industries due to their high energy density, high efficiency, quiet operation, and zero emissions. They boast a wide range of applications and are considered one of the best solutions for addressing energy crises and environmental pollution in the new century. A fuel cell stack consists of multiple single cells stacked in series. The stack contains three chambers for oxidant, fuel, and coolant, each sealed and isolated from the others. Poor sealing between these chambers can reduce fuel cell efficiency at best, or even cause an explosion. Therefore, after assembly, a fuel cell stack must undergo an airtightness test to check for external and cross-leakage within the three chambers. If the leakage rate exceeds a specified value, the product is deemed defective. Therefore, airtightness testing is a key step in ensuring fuel cell stack safety and improving cell efficiency.

[0003] The prior art discloses a testing device and method, namely, when testing the fuel cell stack, "the gas flows to the relatively high-pressure cavity through the straight-through main pipe, and the leaked gas enters the corresponding branch pipe and flow meter bypass from the other cavity to obtain the internal leakage from the relatively high-pressure cavity to the other cavity; the actual internal leakage can be calculated based on the external leakage of the relatively high-pressure cavity under the same pressure." This testing method has certain defects: first, the internal pressure holding pressure of the fuel cell stack will be different when measuring internal leakage and external leakage. When the pressure holding pressure is different, before testing the internal leakage, it is also necessary to test the external leakage under the same pressure; second, during the test process, only the external leakage of one cavity can be tested at a time, which will lead to a significant increase in testing time and testing costs.

[0004] In order to solve the above technical problems, the Chinese utility model patent with the announcement number CN217822891U discloses a fuel cell stack air tightness testing device. However, the device uses multiple flow meters and multiple exhaust valves, and has a complex structure. During the test, multiple measurement parameters need to be obtained, and calculations are performed based on the obtained measurement parameters to obtain the leakage or cross-leakage conditions of the corresponding cavity test, which increases the testing cost. Utility Model Content

[0005] The purpose of the utility model is to provide a fuel cell system airtightness testing device that can accurately obtain various test data, omits complex exhaust valve components, has a simple structure, and saves test costs.

[0006] The utility model is achieved in this way:

[0007] A fuel cell system airtightness testing device includes a pressure fluid source, the pressure fluid source is connected in series with a pressure control component, the pressure control component is controllably connected to multiple chambers of a fuel-electric system through a first air intake pipe group, the multiple chambers of the fuel-electric system are connected to a second air intake pipe group, one end of the second air intake pipe group connected to the chamber of the fuel-electric system is connected to the first air intake pipe group, the first air intake pipe group is connected to the pressure control component at one end and is connected to a first solenoid valve, the first solenoid valve is controllably connected to multiple chambers of the fuel-electric system through the second air intake pipe group, a flow meter is connected between the second air intake pipe group and the first solenoid valve, and one end of the first solenoid valve connected to the second air intake pipe group is connected to an environment without gas flow through the second solenoid valve.

[0008] Furthermore, the first air intake pipe group includes a first main pipe connected to the pressure control component, and the first main pipe is connected to the hydrogen chamber, water chamber and air chamber of the fuel-fired power system through three first branch pipes. The first branch pipes connected to the hydrogen chamber, air chamber and water chamber of the fuel-fired power system are respectively connected to the third solenoid valve, the fourth solenoid valve and the fifth solenoid valve, and the three first branch pipes are connected to the second air intake pipe group.

[0009] Furthermore, the second air intake pipe group includes a second main pipe connected to the first solenoid valve, and the second main pipe is connected to the hydrogen chamber, water chamber and air chamber of the fuel-electric system through three second branch pipes. The second branch pipes connected to the hydrogen chamber, water chamber and air chamber of the fuel-electric system are respectively connected to the sixth solenoid valve, the seventh solenoid valve and the eighth solenoid valve, and the flow meter is connected to the second main pipe; the three first branch pipes are respectively connected to the three second branch pipes.

[0010] Furthermore, the pressure fluid source includes an air source and a pressure reducing valve, and the pressure reducing valve is located between the pressure control component and the air source.

[0011] Furthermore, the pressure control component includes a safety pressure relief valve connected to the pressure fluid source, the safety pressure relief valve is connected in series with a flow controller, the flow controller is connected in series with a pressure gauge, and the pressure gauge is connected in series with the first solenoid valve.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] In actual application, the first battery valve is opened, the second solenoid valve is closed, the communication between the first air intake pipe group and the measured chamber of the fuel-electric system is blocked, and the communication between the first air intake pipe group and other chambers is opened, and the communication between the second air intake pipe group and the measured chamber of the fuel-electric system is blocked, and the chamber of the fuel-electric system is inflated simultaneously through the first air intake pipe group and the second air intake pipe group. When the pressure control component is stable, it is considered that all chambers are at the same air pressure, so there is no leakage between the chambers. The flow rate change of the fluid in the second air intake pipe group, that is, the air supply volume of the measured chamber, is detected by the flow meter, so as to accurately obtain the external leakage of the measured chamber of the fuel-electric system; the first battery valve is closed, the second solenoid valve is opened, and the The first air intake pipe group is connected to a tested chamber of the fuel-electric system, and the connection between the first air intake pipe group and other chambers is blocked to inflate the tested chamber. At the same time, the second air intake pipe group is connected to another tested chamber of the fuel-electric system, and the connection between the second air intake pipe group and other chambers is blocked, so that the other tested chamber is connected to an environment without gas flow. The flow rate change of the fluid in the second air intake pipe group is detected by a flow meter, and the cross-leakage amount of the two tested chambers of the fuel-electric system is accurately obtained; the test results are accurate, and the test time and test cost can be effectively reduced, and the test efficiency is improved; the present application accurately obtains various test data by reading the data of a flow meter, and at the same time omits complex emptying valve components, has a simple structure, and saves test costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 It is a schematic diagram of the electrical structure of the utility model.

[0016] Reference numerals: pressure fluid source 1; gas source 11; pressure reducing valve 12;

[0017] Pressure control component 2; safety relief valve 21; flow controller 22; pressure gauge 23;

[0018] First air intake pipe group 3; third solenoid valve 31; fourth solenoid valve 32; fifth solenoid valve 33;

[0019] Second air intake pipe group 4; sixth solenoid valve 41; seventh solenoid valve 42; eighth solenoid valve 43;

[0020] First solenoid valve 5;

[0021] Flow meter 6;

[0022] Second solenoid valve 7. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] See also Figure 1 A fuel cell system airtightness testing device includes a pressure fluid source 1, the pressure fluid source 1 is connected in series with a pressure control component 2, the pressure control component 2 is controllably connected to multiple chambers of a fuel-electric system through a first air intake pipe group 3, the multiple chambers of the fuel-electric system are connected to a second air intake pipe group 4, one end of the second air intake pipe group 4 connected to the chamber of the fuel-electric system is connected to the first air intake pipe group 3, the end of the first air intake pipe group 3 connected to the pressure control component 2 is connected to a first solenoid valve 5, the first solenoid valve 5 is controllably connected to multiple chambers of the fuel-electric system through the second air intake pipe group 4, a flowmeter 6 is connected between the second air intake pipe group 4 and the first solenoid valve 5, and the end of the first solenoid valve 5 connected to the second air intake pipe group 4 is connected to an environment without gas flow through a second solenoid valve 7.

[0025] In actual application, the first battery valve is opened, the second solenoid valve 7 is closed, the communication between the first air intake pipe group 3 and the measured chamber of the fuel-electric system is blocked, and the communication between the first air intake pipe group 3 and other chambers is opened, and the communication between the second air intake pipe group 4 and the measured chamber of the fuel-electric system is blocked, and the chamber of the fuel-electric system is inflated simultaneously through the first air intake pipe group 3 and the second air intake pipe group 4. When the pressure control component 2 is stable, it is considered that all chambers are at the same air pressure, so there is no leakage between the chambers. The flow rate change of the fluid in the second air intake pipe group 4, that is, the air supply volume of the measured chamber, is detected by the flow meter 6, so as to accurately obtain the leakage volume of the measured chamber of the fuel-electric system; the first battery valve is closed, and the second solenoid valve 7 is opened. , connect the first air intake pipe group 3 with a tested chamber of the fuel-electric system, and block the connection between the first air intake pipe group 3 and other chambers, inflate the tested chamber, and at the same time connect the second air intake pipe group 4 with another tested chamber of the fuel-electric system, and block the connection between the second air intake pipe group 4 and other chambers, so that the other tested chamber is connected to an environment without gas flow, and detect the change in fluid flow in the second air intake pipe group 4 through the flow meter 6, so as to accurately obtain the cross-talk leakage of the two tested chambers of the fuel-electric system; the test results are accurate, and the test time and test cost can be effectively reduced, and the test efficiency is improved; the present application accurately obtains various test data by reading the data of a flow meter 6, and at the same time omits the complex emptying valve components, has a simple structure, and saves test costs.

[0026] See also Figure 1 The first air intake pipe group 3 includes a first main pipe connected to the pressure control component 2, and the first main pipe is connected to the hydrogen chamber, water chamber and air chamber of the fuel-fired power system through three first branch pipes. The first branch pipes connected to the hydrogen chamber, air chamber and water chamber of the fuel-fired power system are respectively connected to the third solenoid valve 31, the fourth solenoid valve 32, and the fifth solenoid valve 33. The three first branch pipes are connected to the second air intake pipe group 4.

[0027] In this embodiment, a fuel-electric system has three chambers that should be sealed and independent of each other, namely, a cavity for storing an oxidant, a water cavity for storing a coolant, and a hydrogen cavity for storing a fuel. A third solenoid valve 31 is connected in series to the first branch pipe connected to the hydrogen cavity, a fourth solenoid valve 32 is connected in series to the first branch pipe connected to the cavity, and a fifth solenoid valve 33 is connected in series to the first branch pipe connected to the water cavity. The third solenoid valve 31, the fourth solenoid valve 32, and the fifth solenoid valve 33 are controlled to be turned on or off when a leakage test is required for the chambers connected thereto, thereby realizing selective on-off control of each first branch pipe.

[0028] See also Figure 1The second air intake pipe group 4 includes a second main pipe connected to the first solenoid valve 5, and the second main pipe is connected to the hydrogen chamber, water chamber and air chamber of the fuel-electric system through three second branch pipes. The second branch pipes connected to the hydrogen chamber, water chamber and air chamber of the fuel-electric system are respectively connected to the sixth solenoid valve 41, the seventh solenoid valve 42, and the eighth solenoid valve 43. The flowmeter 6 is connected to the second main pipe; the three first branch pipes are respectively connected to the three second branch pipes.

[0029] In this embodiment, only one flow meter 6 is provided in the flow test pipeline assembly, and the flow meter 6 can be used to accurately measure the fluid entering different chambers by turning on and off each second branch pipe, thereby further reducing the manufacturing cost of the device; the second branch pipe connected to the hydrogen chamber is connected to the sixth solenoid valve 41, the second branch pipe connected to the water chamber is connected to the seventh solenoid valve 42, and the second branch pipe connected to the empty chamber is connected to the eighth solenoid valve 43. The sixth solenoid valve 41, the seventh solenoid valve 42, and the eighth solenoid valve 43 are respectively controlled to be cut off when it is necessary to perform a leakage test on the chamber connected thereto, thereby realizing selective on-off control of each first branch pipe.

[0030] See also Figure 1 The pressure fluid source 1 includes an air source 11 and a pressure reducing valve 12 , and the pressure reducing valve 12 is located between the pressure control component 2 and the air source 11 .

[0031] The pressure reducing valve 12 can reduce the high-pressure gas flow of the gas source 11 to a required pressure value, thereby preventing excessive fluid pressure from damaging the structure of the fuel cell stack.

[0032] See also Figure 1 The pressure control component 2 includes a safety pressure relief valve 21 connected to the pressure fluid source 1, the safety pressure relief valve 21 is connected in series with a flow controller 22, the flow controller 22 is connected in series with a pressure gauge 23, and the pressure gauge 23 is connected in series with the first solenoid valve 5.

[0033] In this embodiment, during the test process, the safety relief valve 21 is used to protect and adjust the test pressure so that the actual test pressure does not exceed the use requirements. The flow controller 22 is used to adjust the inflation speed so that the inflation speed is maintained at a reasonable level under different test pressures. The pressure gauge 23 is used to display the actual pipeline pressure.

[0034] When it is necessary to test the leakage of the three chambers: open the first solenoid valve 5 and the sixth solenoid valve 41, the seventh solenoid valve 42, and the eighth solenoid valve 43 of the second air intake pipe group 4, and quickly inflate the chamber of the fuel-electric system through the second air intake pipe group 4. At the same time, the connection between the first air intake pipe group 3 and the chamber of the fuel-electric system is blocked, and the second solenoid valve 7 is closed. When the value displayed by the pressure gauge 23 of the pressure control component 2 is stable, the flow rate change of the fluid in the second air intake pipe group 4, that is, the air supply volume of all the chambers of the fuel-electric system, is detected by the flow meter 6. The total leakage of the fuel-electric system can be accurately obtained without further inflating each chamber, simplifying the control process, and connecting different leakage test processes with each other, which can achieve higher test efficiency, reduce test time and cost, and effectively save test costs;

[0035] When it is necessary to test the leakage of a single water cavity of the system: open the first solenoid valve 5, open the third solenoid valve 31 and the fourth solenoid valve 32 of the first air inlet pipe group 3, connect the first main pipe of the first air inlet pipe group 3 with the hydrogen cavity and the air cavity of the fuel-electric system, and inflate the hydrogen cavity and the air cavity of the fuel-electric system through the first main pipe, open the eighth solenoid valve 43 of the second air inlet pipe group 4, and inflate the water cavity of the fuel-electric system through the second main pipe and the corresponding second branch pipe. When the value displayed by the pressure gauge 23 of the pressure control component 2 is stable, the three chambers of the fuel-electric system are at the same air pressure state, so there is no leakage between the chambers. The flow meter 6 detects the change in the fluid flow in the second main pipe, that is, the air supply volume of the water cavity of the fuel-electric system, and can accurately obtain the leakage volume of the water cavity of the fuel-electric system. No unnecessary calculation and emptying components are required, the structure is simple, and the testing cost is saved.

[0036] When it is necessary to detect leakage in the hydrogen cavity or cavity of the fuel-electric system, the method is the same as that for detecting leakage in the water cavity, and the corresponding solenoid valve is opened and closed for measurement;

[0037] When it is necessary to detect the amount of cross-leakage from the hydrogen chamber to the air chamber of the fuel-generating system: open the second solenoid valve 7, open the seventh solenoid valve 42 of the second air intake pipe group 4, and simultaneously block the connection of the other second branches of the second air intake pipe group 4. Connect the air chamber of the fuel-generating system to the environment without gas flow through the corresponding second branches and the second main pipe. Then, open the third solenoid valve 31 of the first air intake pipe group 3, and inflate the hydrogen chamber of the fuel-generating system through the first main pipe and the corresponding first branch pipe. When the value displayed by the pressure gauge 23 of the pressure control component 2 is stable, the flowmeter 6 detects the change in fluid flow in the second main pipe, i.e., the amount of cross-leakage from the hydrogen chamber to the air chamber of the fuel-generating system.

[0038] When it is necessary to measure the leakage of other cavities in the fuel-electric system, the corresponding solenoid valve is opened and closed for measurement, which is the same as measuring the leakage from the hydrogen cavity to the air cavity of the fuel-electric system.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A fuel cell system airtightness test device, characterized by: The invention comprises a pressure fluid source (1), wherein the pressure fluid source (1) is connected in series with a pressure control component (2), wherein the pressure control component (2) is controllably connected to a plurality of chambers of a fuel-electric system through a first air intake pipe group (3), wherein the plurality of chambers of the fuel-electric system are connected to a second air intake pipe group (4), wherein one end of the second air intake pipe group (4) is connected to the chamber of the fuel-electric system and is communicated with the first air intake pipe group (3), wherein one end of the first air intake pipe group (3) is connected to the pressure control component (2) and is connected to a first solenoid valve (5), wherein the first solenoid valve (5) is controllably connected to the plurality of chambers of the fuel-electric system through the second air intake pipe group (4), wherein a flow meter (6) is connected between the second air intake pipe group (4) and the first solenoid valve (5), wherein one end of the first solenoid valve (5) is connected to the second air intake pipe group (4) and is communicated with an environment without gas flow through a second solenoid valve (7).

2. A fuel cell system airtightness testing device according to claim 1, characterized in that: The first air intake pipe group (3) includes a first main pipe connected to the pressure control component (2), the first main pipe is connected to the hydrogen chamber, the water chamber and the air chamber of the fuel-electric system through three first branch pipes, and the first branch pipes connected to the hydrogen chamber, the air chamber and the water chamber of the fuel-electric system are respectively connected to a third solenoid valve (31), a fourth solenoid valve (32) and a fifth solenoid valve (33), and the three first branch pipes are connected to the second air intake pipe group (4).

3. A fuel cell system airtightness testing device according to claim 2, characterized in that: The second air inlet pipe group (4) includes a second main pipe connected to the first solenoid valve (5); the second main pipe is connected to the hydrogen chamber, the water chamber and the air chamber of the fuel-electric system through three second branch pipes; the second branch pipes connected to the hydrogen chamber, the water chamber and the air chamber of the fuel-electric system are respectively connected to the sixth solenoid valve (41), the seventh solenoid valve (42) and the eighth solenoid valve (43); the flow meter (6) is connected to the second main pipe; the three first branch pipes are respectively connected to the three second branch pipes.

4. A fuel cell system airtightness testing device according to claim 1, characterized in that: The pressure fluid source (1) comprises an air source (11) and a pressure reducing valve (12), wherein the pressure reducing valve (12) is located between the pressure control component (2) and the air source (11).

5. The fuel cell system airtightness testing device according to claim 1, characterized in that: The pressure control component (2) includes a safety pressure relief valve (21) connected to the pressure fluid source (1), the safety pressure relief valve (21) is connected in series with a flow controller (22), the flow controller (22) is connected in series with a pressure gauge (23), and the pressure gauge (23) is connected in series with the first solenoid valve (5).

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