CN214040531U - Fixed-point leak detection system for fuel cell polar plate - Google Patents
Fixed-point leak detection system for fuel cell polar plate Download PDFInfo
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- CN214040531U CN214040531U CN202022721297.4U CN202022721297U CN214040531U CN 214040531 U CN214040531 U CN 214040531U CN 202022721297 U CN202022721297 U CN 202022721297U CN 214040531 U CN214040531 U CN 214040531U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model relates to a fixed point leak detection system for a fuel cell polar plate, which comprises a testing device and a detecting device, wherein the testing device comprises a fluorescence detection liquid circulation loop, a high-pressure gas circuit and a purging gas circuit, the polar plate (15) to be detected is arranged on the fluorescence detection liquid circulation loop, and the high-pressure gas circuit and the purging gas circuit are respectively connected with a detection inlet and a detection port side of the polar plate (15); the detection device comprises a detection chamber (17), an ultraviolet lamp light source (16) and a camera; the polar plate (15) tested by the testing device is arranged in the detection chamber (17), and the leakage point on the polar plate (15) is positioned by the ultraviolet lamp light source (16) and the camera therein. Compared with the prior art, the utility model discloses a long-time fluorescent agent trace infiltration polar plate can effectively detect the leakage condition of polar plate. Due to the missing nature of the phosphor and its adhesion to the surface, the location of the leak can be effectively identified.
Description
Technical Field
The utility model belongs to the technical field of fuel cell and specifically relates to a fuel cell polar plate leak hunting system of fixing a point is related to.
Background
With the gradual maturity of fuel cell technology, the fuel cell is used as a zero-pollution and high-efficiency power generation device capable of directly converting chemical energy into electric energy, and is increasingly applied to the fields of communication relay stations, vehicle-mounted power, distributed power supplies and the like.
The polar plate is one of the core components of the fuel cell and plays a role in distributing gas, conducting heat and electric energy. Because the voltage value of a single fuel cell is low under a rated working state, in order to realize high-power output, more than one hundred or even several hundred pieces of fuel cells are generally needed to realize the high-power output. Therefore, the requirement on the quality consistency control of the electrode plate is high.
To improve the power density of a fuel cell and to reduce the resistance value. Fuel cell plates are becoming thinner and thinner, which places stringent leakage prevention requirements on both metal and graphite plates.
Currently, the gas tightness leak detection of most polar plates is checked from the gas diffusion angle, for example, patent application No. 201911390835.1 discloses a hydrogen fuel cell bipolar plate sealing test device, which mainly uses gas pressure difference to detect the pressure change condition; the patent with application number of 201910781926.1 discloses a device and a method for detecting welding leakage of a bipolar plate, membrane electrode leakage and leakage outside a galvanic pile, wherein the leakage detection is mainly carried out by using a method for collecting and detecting helium or nitrogen, and the patent with application number of 201811028829.7 discloses a method for detecting the leakage of the bipolar plate in the galvanic pile of a fuel cell, which uses the power generation characteristics of the galvanic pile of the fuel cell and uses hydrogen for detecting the leakage.
The methods disclosed in the above patent applications are all capable of detecting leakage, but the location of the leakage cannot be located, nor the severity of the leakage can be known.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a fuel cell polar plate fixed point leak detection system for overcoming the defects existing in the prior art.
The purpose of the utility model can be realized through the following technical scheme: a fixed-point leak detection system for a fuel cell polar plate comprises a testing device and a detecting device,
the testing device comprises a fluorescence detection liquid circulation loop, a high-pressure gas path and a purging gas path, wherein the polar plate to be detected is arranged on the fluorescence detection liquid circulation loop, and the high-pressure gas path and the purging gas path are respectively connected to the detection inlet and the detection port side of the polar plate;
the detection device comprises a detection chamber, an ultraviolet light source and a camera;
the polar plate tested by the testing device is arranged in the detection chamber, and the leakage point on the polar plate is positioned by the ultraviolet light source and the camera therein.
Furthermore, fluorescence detect liquid circulation circuit including the fluorescence colour reagent liquid storage pot, pump, valve a, pressure gauge, valve b and the fluorescence colour reagent liquid storage pot that connect gradually, the polar plate is installed between valve a and valve b.
Furthermore, a fluorescent color developing agent solution is filled in the fluorescent color developing agent liquid storage tank, the fluorescent color developing agent solution is prepared by dissolving a fluorescent color developing agent in a polar solvent or a non-polar solvent, and the volume concentration of the fluorescent color developing agent solution is 300-700 ppm.
Further, the polar solvent comprises water, and the nonpolar solvent comprises gasoline or ethanol.
Further, the pressure gauge is a pressure gauge or a pressure sensor.
Furthermore, the polar plate is fixed in the clamp, and a channel to be detected on the polar plate is connected to a detection inlet and a detection outlet on the clamp;
furthermore, the polar plate installed in the clamp is a unipolar plate, a bipolar plate or a bipolar plate with a plurality of superposed sheets.
Further, the high-pressure gas circuit comprises a high-pressure gas tank or an air compressor, a valve c and a valve d which are sequentially connected through a high-pressure pipeline; the high-pressure gas tank is a nitrogen tank;
furthermore, the purging gas circuit comprises a fan, a heat exchanger, a valve e, a discharge pipe and a valve f, wherein the fan, the heat exchanger and the valve e are sequentially connected through a purging pipeline, the discharge pipe is connected to the electrode plate detection inlet, and the valve f is arranged on the discharge pipe.
Furthermore, the detection chamber is a darkroom, and the ultraviolet light source and the camera are arranged at the top of the darkroom.
The leak detection method by adopting the fuel cell polar plate fixed-point leak detection system comprises the following steps:
1) connecting a clamp provided with an electrode plate to be detected in a fluorescence detection liquid circulation loop, opening a valve a and a valve b, starting a pump when other valves are in a closed state, inputting a fluorescence color developing agent solution in a fluorescence color developing agent liquid storage tank into the clamp, circulating the fluorescence color developing agent solution back to the fluorescence color developing agent liquid storage tank, adjusting the pressure of the pump to enable the reading of a pressure gauge to reach a preset pressure value, and gradually closing the valve b and the pump;
2) completely closing the valve a and the valve b, keeping the valve f, closing the valve e, opening the valve d, enabling high-pressure gas output by the high-pressure gas tank or the air compressor to enter the clamp through the valve d by adjusting the pressure of the valve c, keeping the pressure value index at a preset pressure value, and keeping the preset time length;
3) after the preset time is up, closing the valve d, sequentially opening the valve b and the valve a, and completely refluxing the fluorescent color developing agent solution to a fluorescent color developing agent liquid storage tank at the bottom of the system;
4) closing the valve a and the valve b, keeping the valve d closed, opening the valve e and the valve f, opening the heat exchanger, opening the fan, and introducing hot air into the tested polar plate until the solution in the polar plate is completely volatilized, thereby completing the penetration test;
5) and after cooling to room temperature, taking down the polar plate in the fixture, placing the polar plate in a detection chamber, wherein the surface of the polar plate, which is contacted with the fluorescent color developing agent solution in a permeation experiment, is downward, and the surface of the polar plate, which is not contacted with the fluorescent color developing agent solution, is upward, and observing the permeation condition of the fluorescent agent on the polar plate through the ultraviolet light source 16 and the camera therein.
The preset pressure value in the step 1) and the step is 4-100 KPa;
the preset time in the step 2) is 10-100 h.
The temperature of the hot air in the step 4) is 60-80 ℃, and the hot air purging time is 2-3 h.
The system can control the valve, the fan, the water pump and the heater part in the system through master control programming or enabling operation, when the system is installed, the measured pole plate tool is located at the highest position of the level, the fluorescence color developing agent solution storage tank is located at the lowest position, before the system is started, the fluorescence color developing agent solution can be ensured not to remain in the electric pile as far as possible and flow back to the fluorescence color developing agent solution, the total amount of the fluorescence color developing agent solution in the system is smaller than the capacity of the storage tank, the follow-up drying operation time is reduced, and the waste is reduced.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses to wait to detect bipolar plate and arrange testing arrangement in, make fluorescence colour development agent infiltration fuel cell bipolar plate and dry, thereby position and severity are leaked in darkroom colour development location. The specific method is that the prepared fluorescent color developing agent solution is pumped into a plate detection device, so that the fluorescent color developing agent solution is kept on one side of a plate for a long time, and the other side of the plate is in a normal pressure state. The hold time is sufficient, the fluorescent developer solution is pumped out, and the reaction chamber is dried. The plate is placed in a dark room, and the condition of the other side is observed by using ultraviolet light, so that the leakage condition can be seen.
2 the utility model discloses a fluorescence colour developing agent solution include two kinds: polar and non-polar solvents, the former being more soluble in polar solutions such as water, the latter being more soluble in non-polar solutions such as ethanol, gasoline, etc., selected according to experimental necessity. For graphite plates with corroded metal plates or severe leakage, color difference is easy to form due to the fluorescent color developing agent, and the graphite plates are not required to be placed in a dark room for observation.
3. The utility model discloses a valve control can be compatible include if whole pile, monolithic polar plate, bipolar plate, multi-disc bipolar plate etc. measurand to realize automatic test.
4. The utility model can maintain the pressure difference of the measured polar plate for a long time under the state of low energy consumption; the fluorescent color developing agent solution can be discharged before the experiment is finished through the operation of the valve, and the flowing interference and the misoperation interference of the fluorescent agent are avoided through drying.
5. The utility model discloses a darkroom for detecting bipolar plate includes: darkroom environment, ultraviolet lamp light source, necessary protector and camera device, its test result can directly draw the position of leaking and the leakage condition through visual.
6. The utility model discloses a long-time fluorescent agent trace infiltration polar plate can effectively detect the leakage condition of polar plate. Due to the missing nature of the phosphor and its adhesion to the surface, the location of the leak can be effectively identified.
Drawings
FIG. 1 is a schematic view of the testing device of the present invention;
fig. 2 is a schematic view of the detecting device of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The fluorescent color developing agent adopted in the utility model is a commercial product, such as Luyang LUYOR-6200, Haifenda SU500-TY-B310, fluorescence hong science SLO3100 and the like; the fluorescent color developing agent solution is obtained by dissolving a commercially available fluorescent color developing agent in a solvent.
Example 1
A fixed-point leak detection system for a fuel cell polar plate comprises a testing device and a detecting device,
the testing device comprises a fluorescence detection liquid circulation loop, a high-pressure gas circuit and a purging gas circuit as shown in fig. 1, wherein the polar plate 15 to be detected is installed on the fluorescence detection liquid circulation loop, and the high-pressure gas circuit and the purging gas circuit are respectively connected to a detection inlet and a detection port side of the polar plate 15;
wherein, fluorescence detection liquid circulation circuit include fluorescence colour development agent liquid storage pot 13, pump 1, valve a2, manometer 3 (adopt the manometer in this embodiment), valve b12 and fluorescence colour development agent liquid storage pot 13 that connect gradually, polar plate 15 installs between valve a2 and valve b 12. The fluorescent color developing agent liquid storage tank 13 is filled with a fluorescent color developing agent solution, and the fluorescent color developing agent solution is a solution obtained by dissolving a fluorescent color developing agent in water and has the volume concentration of 300-700 ppm. The polar plate 15 is fixed in the clamp 8, and a channel to be detected on the polar plate 15 is connected to a detection inlet and a detection outlet on the clamp 8;
the high-pressure gas path comprises a high-pressure gas tank or an air compressor 6, a valve c7 and a valve d5 which are sequentially connected through a high-pressure pipeline; the high-pressure gas tank is a nitrogen tank;
the purging gas circuit comprises a fan 11, a heat exchanger 10, a valve e9, a discharge pipe connected to the detection inlet of the pole plate 15 and a valve f4 arranged on the discharge pipe, wherein the fan 11, the heat exchanger 10 and the valve e9 are sequentially connected through a purging pipeline.
The detection device, as shown in fig. 2, includes a detection chamber 17, an ultraviolet lamp light source 16 and a camera; the detection chamber 17 is a darkroom, and the ultraviolet lamp light source 16 and the camera are arranged at the top of the darkroom.
The polar plate 15 tested by the testing device is arranged in the detection chamber 17, and the leakage point on the polar plate 15 is positioned by the ultraviolet lamp light source 16 and the camera therein.
The leak detection method by adopting the fuel cell polar plate fixed-point leak detection system comprises the following steps:
1. connecting a clamp 8 provided with a polar plate 15 to be detected in a fluorescence detection liquid circulation loop, opening a valve a2 and a valve b12, starting a pump 1 when other valves are in a closed state, inputting a fluorescence color developing agent solution in a fluorescence color developing agent liquid storage tank 13 into the clamp, circulating the fluorescence color developing agent solution back to the fluorescence color developing agent liquid storage tank 13, adjusting the pressure of the pump 1 to enable the reading of a pressure gauge 3 to reach a preset pressure value of 100KPa, and gradually closing the valve b12 and the pump 1;
2. completely closing the valve a2 and the valve b12, keeping the valve f4, closing the valve e9, opening the valve d5, enabling high-pressure gas output by the high-pressure gas tank or the air compressor 6 to enter the clamp 8 through the valve d5 by adjusting the pressure of the valve c7, keeping the pressure value index at a preset pressure value of 100KPa, and keeping the preset time period for 100 h;
3. after the preset time is up, closing the valve d5, opening the valve b12 and the valve a2 in sequence, and completely returning the fluorescent color developing agent solution to the fluorescent color developing agent liquid storage tank 13 at the bottom of the system;
4. closing the valve a2 and the valve b12, keeping the valve d5 closed, opening the valve e9 and the valve f4, opening the heat exchanger 10, opening the fan 11, introducing 80 ℃ hot air into the tested polar plate 15, and purging for 2 hours until the solution in the solution is completely volatilized, thus completing the permeation test;
5. after cooling to room temperature, the polar plate 15 in the clamp 8 is taken down and placed in the detection chamber 17, wherein the polar plate 15 is downward in contact with the fluorescent color developing agent solution in the permeation experiment, and the non-contact surface is upward, and the permeation condition of the fluorescent agent on the polar plate is observed through the ultraviolet light source 16 and the camera therein.
The system can control the components of a valve, a fan, a water pump and a heater in the system through the controller 14, when the system is installed, the tool of the measured polar plate is located at the highest horizontal position, and the liquid storage tank of the fluorescent color developing agent solution is located at the lowest position. Before the system is started, the fluorescent color developing agent solution is required to be ensured not to remain in the electric pile as far as possible and to flow back to the fluorescent color developing agent solution, and the total amount of the fluorescent color developing agent solution in the system is smaller than the capacity of the liquid storage tank, so that the subsequent drying operation time is reduced, and the waste is reduced.
Example 2
The polar plate arranged in the clamp 8 is a unipolar plate, and a pressure value of 4KPa is preset during detection for 10 h; the pressure gauge 3 adopts a pressure sensor, and the penetration test is the same as the embodiment 1, and the leakage position and the leakage condition can be obtained by direct observation instead of observation in a dark room because the leakage is serious.
The clamp 8 can also be provided with a fuel cell stack or a plurality of superposed bipolar plates, during testing, a tested object is kept to enter the fluid channel to be tested of each bipolar plate through a detection inlet on the clamp and then flows out from a detection outlet on the clamp, so that the tested object can be a whole stack, a single polar plate, a bipolar plate or a plurality of bipolar plates.
Claims (9)
1. A fixed-point leak detection system for a fuel cell polar plate is characterized by comprising a testing device and a detecting device,
the testing device comprises a fluorescence detection liquid circulation loop, a high-pressure gas path and a purging gas path, wherein the polar plate (15) to be detected is arranged on the fluorescence detection liquid circulation loop, and the high-pressure gas path and the purging gas path are respectively connected to the detection inlet and the detection port side of the polar plate (15);
the detection device comprises a detection chamber (17), an ultraviolet lamp light source (16) and a camera;
the polar plate (15) tested by the testing device is arranged in the detection chamber (17), and the leakage point on the polar plate (15) is positioned by the ultraviolet lamp light source (16) and the camera therein.
2. The fixed-point leak detection system for the fuel cell pole plate according to claim 1, wherein the fluorescence detection liquid circulation loop comprises a fluorescence color reagent storage tank (13), a pump (1), a valve a (2), a pressure gauge (3), a valve b (12) and the fluorescence color reagent storage tank (13) which are connected in sequence, and the pole plate (15) is installed between the valve a (2) and the valve b (12).
3. The fixed-point leak detection system for the fuel cell pole plate as recited in claim 2, wherein the fluorescent color reagent storage tank (13) is filled with a fluorescent color reagent solution.
4. A fuel cell plate spot leak detection system according to claim 2, wherein said pressure gauge (3) is a pressure gauge or a pressure sensor.
5. The fuel cell pole plate fixed-point leak detection system according to claim 1 or 2, wherein the pole plate (15) is fixed in the fixture (8), and the channel to be detected on the pole plate (15) is connected to a detection inlet and a detection outlet on the fixture (8).
6. The fuel cell pole plate fixed-point leak detection system according to claim 5, wherein the pole plate installed in the fixture (8) is a unipolar plate, a bipolar plate or a plurality of stacked bipolar plates.
7. The fixed-point leak detection system for the fuel cell pole plate according to claim 1, wherein the high-pressure gas circuit comprises a high-pressure gas tank or air compressor (6), a valve c (7) and a valve d (5) which are sequentially connected by a high-pressure pipeline; the high-pressure gas tank is a nitrogen tank.
8. The fuel cell pole plate fixed-point leak detection system according to claim 1, wherein the purging gas circuit comprises a blower (11), a heat exchanger (10), a valve e (9) which are connected in sequence by a purging pipeline, and a discharge pipe connected at a detection inlet of the pole plate (15) and a valve f (4) arranged on the discharge pipe.
9. The fuel cell plate fixed-point leak detection system according to claim 1, wherein the detection chamber (17) is a darkroom, and the ultraviolet lamp light source (16) and the camera are arranged at the top of the darkroom.
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| CN202022721297.4U CN214040531U (en) | 2020-11-22 | 2020-11-22 | Fixed-point leak detection system for fuel cell polar plate |
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| CN202022721297.4U CN214040531U (en) | 2020-11-22 | 2020-11-22 | Fixed-point leak detection system for fuel cell polar plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117110195A (en) * | 2023-09-20 | 2023-11-24 | 国电清航瑞恒江苏环保科技有限公司 | Biomembrane adhesion detection device and detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117110195A (en) * | 2023-09-20 | 2023-11-24 | 国电清航瑞恒江苏环保科技有限公司 | Biomembrane adhesion detection device and detection method |
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