CN214894731U - Device for testing anisotropic permeability of fuel cell carbon paper - Google Patents
Device for testing anisotropic permeability of fuel cell carbon paper Download PDFInfo
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- CN214894731U CN214894731U CN202022009555.6U CN202022009555U CN214894731U CN 214894731 U CN214894731 U CN 214894731U CN 202022009555 U CN202022009555 U CN 202022009555U CN 214894731 U CN214894731 U CN 214894731U
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Abstract
The utility model discloses a device for testing the anisotropic permeability of fuel cell carbon paper, relating to the technical field of the anisotropic permeability of fuel cell carbon paper; in order to solve the problem of singularity of permeability test; the clamp comprises an upper clamp and a lower clamp, wherein an air inlet and an air outlet are formed in the top and the bottom outer walls of the upper clamp and the lower clamp respectively, the inner walls of the air inlet and the air outlet are connected with a first quick screwing joint through threads respectively, circular grooves are formed in the inner walls of the upper clamp and the lower clamp on one side opposite to each other, the inner walls of the two circular grooves are clamped and connected with the same carbon paper sample, an air guide port is formed in the outer wall of one side of the upper clamp, a second quick screwing joint is formed in the inner wall of the air guide port through threads, and a circular ring air guide groove is formed in the inner wall of the upper clamp close to one side of the circular grooves. The utility model discloses not only solved the limitation problem of traditional single normal direction permeability test, combined plane and normal direction permeability test integration moreover, measured precision has also obtained the improvement.
Description
Technical Field
The utility model relates to a fuel cell carbon paper anisotropic permeability technical field especially relates to a test fuel cell carbon paper anisotropic permeability's device.
Background
A pem fuel cell is a power generation device that converts chemical energy into electrical energy. The internal working principle of the fuel cell is the process of generating electricity, heat and water by the electrochemical reaction of hydrogen and oxygen, and the fuel cell is regarded as the most promising power source of future automobiles due to the advantages of zero pollution, high energy conversion efficiency, quick start response, low working temperature, low noise and the like.
The proton exchange membrane fuel cell mainly comprises a bipolar plate and a membrane electrode stack, wherein a membrane electrode component comprises a proton exchange membrane, a catalyst layer and a gas diffusion layer. The gas diffusion layer is about 100-250 μm thick, mainly used for conducting gas, collecting current and draining water, and composed of a microporous layer and a substrate layer, wherein the substrate layer is generally made of carbon paper. Generally, carbon paper is selected to meet the requirements of power generation performance, drainage and the like. The permeability is one of the main physical parameters of the carbon paper, and is divided into normal permeability and plane permeability, which represent the ability of gas to pass through the substrate layer under the action of a certain pressure difference, and the permeability has a significant influence on the battery performance. In the carbon paper area where bipolar plate ridge contact is considered, reactant concentration, water drainage capacity are closely related to permeability parameters, especially planar permeability. Therefore, the normal permeability and the plane permeability parameters of the carbon paper are important physical property parameters affecting the battery performance and the water drainage capability.
In the prior art, the test fixture and the device for the fuel cell carbon paper can only test the permeability of the carbon paper in the normal direction, but cannot measure the permeability of the carbon paper in the plane direction, and the normal permeability measurement device and the plane permeability measurement device need to be separately developed and designed. In addition, the permeability measuring clamp and the device have large volumes, and the calculation method has low precision.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the defects existing in the prior art and providing a device for testing the anisotropic permeability of the carbon paper of the fuel cell.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the device for testing the anisotropic permeability of the carbon paper of the fuel cell comprises an upper clamp and a lower clamp, wherein the top and the bottom outer walls of the upper clamp and the lower clamp are respectively provided with an air inlet and an air outlet, the inner walls of the air inlet and the air outlet are respectively connected with a first quick screwing joint through threads, the inner walls of the opposite sides of the upper clamp and the lower clamp are respectively provided with a circular groove, the inner walls of the two circular grooves are clamped with the same carbon paper sample, the outer wall of one side of the upper clamp is provided with an air guide port, the inner wall of the air guide port is connected with a second quick screwing joint through threads, the inner wall of one side of the upper clamp, which is close to the circular groove, is provided with a circular air guide groove, the first quick screwing joint at the top end of the upper clamp is connected with a pressure gauge, a dryer, a micro-regulating valve and a pressure reducing valve through a first conduit, the end part of the first conduit is connected with an air source through threads, and the first quick screwing joint at the bottom end of the lower clamp is connected with an electromagnetic valve through a second conduit, The end part of the second quick-screwing connector is connected with a third guide pipe through threads, and one end of the third guide pipe is connected with the second guide pipe through threads.
Preferably: the outer walls of one sides of the upper clamp and the lower clamp, which are close to the respective circular grooves, are provided with first annular mounting grooves, and the inner walls of the two first annular mounting grooves are filled with sealing gaskets.
Further: and the outer walls of one sides of the upper clamp and the lower clamp, which are close to the circular air guide groove, are provided with second annular mounting grooves, and the inner walls of the two second annular mounting grooves are filled with the same sealing ring.
On the basis of the scheme: the inner wall of the air guide port is carved with threads distributed at equal intervals, and the air guide port is communicated with the circular air guide groove.
The better scheme in the scheme is as follows: the upper clamp and the lower clamp are connected through eight bolts.
As a further aspect of the present invention: the two circular grooves form a cylindrical structure, and the two first annular mounting grooves, the two second annular mounting grooves and the circular ring air guide groove respectively form a circular ring body structure.
Meanwhile, the carbon paper sample can be replaced by a gas diffusion layer or a microporous layer; the test gas can be replaced by hydrogen, air or nitrogen; the test gas pressure is 0.01-0.5 MPa.
The utility model has the advantages that:
1. the device for testing the anisotropic permeability of the carbon paper of the fuel cell not only solves the limitation problem of the traditional single normal permeability test, but also integrates the plane and the normal permeability test, and the measurement precision is also improved.
2. This device of test fuel cell carbon paper anisotropic permeability through the setting of the sealed pad of sealing ring, has effectively avoided the problem of gas leakage that appears in the test procedure to guarantee validity and the authenticity of test result to a certain extent, improved the measurement accuracy of whole device.
3. The device for testing the anisotropic permeability of the carbon paper of the fuel cell has the advantages of simple integral structure, convenience in installation and lower cost.
4. This test fuel cell carbon paper anisotropic permeability's device not only can carry out the permeability test to the carbon paper in the fuel cell, can all carry out the permeability test to its inside gas diffusion layer and micropore layer moreover, has improved the variety of test greatly.
Drawings
Fig. 1 is a schematic structural diagram of a front view of an apparatus for testing anisotropic permeability of carbon paper of a fuel cell according to the present invention;
fig. 2 is a schematic structural diagram of a test fixture in an apparatus for testing anisotropic permeability of carbon paper of a fuel cell according to the present invention;
fig. 3 is a schematic cross-sectional structure diagram of a side view fixture in an apparatus for testing anisotropic permeability of carbon paper of a fuel cell according to the present invention;
fig. 4 is a schematic structural diagram of a circular sample in the device for testing the anisotropic permeability of the carbon paper of the fuel cell provided by the present invention.
In the figure: 1-upper clamp, 2-first quick-screwing joint, 21-second quick-screwing joint, 3-bolt, 4-sealing ring, 5-sealing gasket, 6-carbon paper sample, 7-lower clamp, 8-pressure gauge, 9-dryer, 10-micro-regulating valve, 11-pressure reducing valve, 12-air source, 13-flowmeter and 14-electromagnetic valve.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
Example 1:
a device for testing the anisotropic permeability of carbon paper of a fuel cell comprises an upper clamp 1 and a lower clamp 7, wherein the upper clamp 1 and the lower clamp 7 are connected through eight bolts 3, the top and bottom outer walls of the upper clamp 1 and the lower clamp 7 are respectively provided with an air inlet and an air outlet, the inner walls of the air inlet and the air outlet are respectively connected with a first quick-screwing connector 2 through threads, the inner walls of the opposite sides of the upper clamp 1 and the lower clamp 7 are respectively provided with a circular groove, the inner walls of the two circular grooves are clamped with a same carbon paper sample 6, the outer wall of one side of the upper clamp 1 is provided with an air guide port, the inner wall of the air guide port is connected with a second quick-screwing connector 21 through threads, the inner wall of one side of the upper clamp 1, which is close to the circular groove, is provided with a circular air guide groove, and the first quick-screwing connector 2 positioned at the top end of the upper clamp 1 is connected with a pressure gauge 8 and a pressure gauge 8 through a first guide pipe, The dryer comprises a dryer 9, a micro-regulating valve 10 and a pressure reducing valve 11, wherein the end part of a first conduit is connected with an air source 12 through threads, a first quick-screwing joint 2 positioned at the bottom end of a lower clamp 7 is connected with an electromagnetic valve 14, a pressure gauge 8 and a flowmeter 13 through a second conduit, the end part of a second quick-screwing joint 21 is connected with a third conduit through threads, and one end of the third conduit is connected with the second conduit through threads; when the device is used, the carbon paper sample 6 is placed between the two circular grooves, the electromagnetic valve 14 on the third guide pipe is in a closed state, the electromagnetic valve 14 on the second guide pipe is opened, the pressure gauge 8 at the inlet of the upper clamp 1 is adjusted to a certain pressure through the micro-adjusting valve 10, the flow rate of the entering test gas is stable, the readings of the pressure gauge 8 and the flowmeter 13 on the third guide pipe are recorded after 30min, the steps are repeated for at least 3 times of tests, and the test of the plane permeability is obtained by averaging; subsequently, the carbon paper sample 6 is placed between the two circular grooves, the electromagnetic valve 14 on the second guide pipe is closed, the electromagnetic valve 14 on the third guide pipe is opened, the pressure gauge 8 at the inlet of the upper clamp 1 is adjusted to a certain pressure through the micro-adjusting valve 10, the flow rate of the entering test gas is stable, the readings of the pressure gauge 8 and the flowmeter 13 on the third guide pipe are recorded after 30min, the steps are repeated for at least 3 times of tests, and the average value is taken to obtain the normal permeability test.
In order to improve the air tightness of the whole device; as shown in fig. 3, the outer walls of the upper clamp 1 and the lower clamp 7 close to the respective circular grooves are respectively provided with a first annular mounting groove, the inner walls of the two first annular mounting grooves are respectively filled with a sealing gasket 5, the outer walls of the upper clamp 1 and the lower clamp 7 close to the circular air guide groove are respectively provided with a second annular mounting groove, and the inner walls of the two second annular mounting grooves are respectively filled with the same sealing ring 4; through the arrangement of the sealing gasket 5 of the sealing ring 4, the problem of air leakage in the testing process is effectively avoided, so that the validity and authenticity of the testing result are guaranteed to a certain extent, and the measuring precision of the whole device is improved.
In order to ensure the orderly horizontal permeability measurement, as shown in fig. 3, the inner wall of the air guide port is engraved with threads distributed at equal intervals, and the air guide port is communicated with the circular air guide groove.
Preferably, the carbon paper sample 6 can be replaced with a gas diffusion layer or a microporous layer; the test gas can be replaced by hydrogen, air or nitrogen; the test gas pressure is 0.01-0.5 MPa.
When the carbon paper sample testing device is used, the carbon paper sample 6 is placed between the two circular grooves, the electromagnetic valve 14 on the third guide pipe is in a closed state, the electromagnetic valve 14 on the second guide pipe is opened, the pressure gauge 8 at the inlet of the upper clamp 1 is adjusted to a certain pressure through the micro-adjusting valve 10, the flow rate of the entering testing gas is stable, the readings of the pressure gauge 8 and the flowmeter 13 on the third guide pipe are recorded after 30min, the steps are repeated for at least 3 times of tests, and the test of the plane permeability is obtained by averaging.
Then, placing the carbon paper sample 6 between the two circular grooves, closing the electromagnetic valve 14 on the second guide pipe, opening the electromagnetic valve 14 on the third guide pipe, adjusting the pressure gauge 8 at the inlet of the upper clamp 1 to a certain pressure through the micro-adjusting valve 10, stabilizing the flow rate of the entering test gas, recording the readings of the pressure gauge 8 and the flowmeter 13 on the third guide pipe after 30min, repeating the steps for at least 3 times of tests, and averaging to obtain the test of normal permeability.
And calculating the permeability according to the gas flow, the inlet pressure, the outlet pressure and other parameters measured by the gas flowmeter at the outlet of the testing device, wherein the formula is as follows:
wherein P is0At atmospheric pressure, Q0Is the gas flow at atmospheric pressure, mugIs the gas viscosity, L is the sample thickness, PinIs the inlet pressure, PoutIs the outlet pressure, A is the cross-sectional flow area of the sample;
in the calculation of normal permeability, the flow cross-sectional area A of the sample is pi r2(ii) a In the calculation of the plane permeability, the flow cross-sectional area of the sample is A ═ L [ R + (R-R)/2]。
Example 2:
a method of testing an apparatus for anisotropic permeability of fuel cell carbon paper, comprising the steps of:
s1: placing the carbon paper sample 6 between the two circular grooves, and placing the sealing gasket 5 and the sealing ring 4;
s2: closing the electromagnetic valve 14 on the third conduit, opening the electromagnetic valve 14 on the second conduit, and adjusting the pressure gauge 8 at the inlet of the upper clamp 1 to a certain pressure through the micro-regulating valve 10, so that the flow rate of the entering test gas is stable;
s3: ventilating for 30min, recording the readings of a pressure gauge 8 and a flowmeter 13 on the third conduit after 30min, repeating the steps for at least 3 times, and taking an average value to obtain a test of plane permeability;
s4: subsequently, a second carbon paper sample 6 is placed between the two circular grooves, and the sealing gasket 5 and the sealing ring 4 are replaced with new ones;
s5: closing the electromagnetic valve 14 on the second conduit, opening the electromagnetic valve 14 on the third conduit, and adjusting the pressure gauge 8 at the inlet of the upper clamp 1 to a certain pressure through the micro-regulating valve 10, so that the flow rate of the entering test gas is stable;
s6: ventilating for 30min, recording the readings of a pressure gauge 8 and a flowmeter 13 on the third conduit after 30min, repeating the steps for at least 3 times, and taking an average value to obtain a normal permeability test;
s7: and summarizing and analyzing the results of the plane permeability and the normal permeability.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (7)
1. The utility model provides a device of test fuel cell carbon paper anisotropic permeability, including last anchor clamps (1) and lower anchor clamps (7), a serial communication port, go up anchor clamps (1) and all opened air inlet and gas outlet with lower anchor clamps (7) top and bottom outer wall, and the inner wall of air inlet and gas outlet has first fast twist joint (2) through threaded connection respectively, and go up anchor clamps (1) and all opened circular recess with lower anchor clamps (7) relative one side inner wall, the inner wall clamp joint of two circular recesses has same carbon paper sample (6), it has the gas guide mouth to go up one side outer wall of anchor clamps (1), and the inner wall of gas guide mouth has second fast twist joint (21) through threaded connection, it has the ring to lead the gas groove to go up the inner wall that anchor clamps (1) are close to circular recess one side and open, the first fast twist joint (2) that lie in anchor clamps (1) top have manometer (8) through first pipe connection, Desicator (9), micro-control valve (10) and relief pressure valve (11), and there is air supply (12) the tip of first pipe through threaded connection, and there are solenoid valve (14), manometer (8) and flowmeter (13) first quick-twist joint (2) that are located anchor clamps (7) bottom down through second pipe connection, and there is the third pipe second quick-twist joint (21) tip through threaded connection, and the one end of third pipe is connected with the second pipe through the screw thread.
2. The device for testing the anisotropic permeability of the carbon paper of the fuel cell is characterized in that the outer walls of one sides, close to the respective circular grooves, of the upper clamp (1) and the lower clamp (7) are respectively provided with a first annular mounting groove, and the inner walls of the two first annular mounting grooves are respectively filled with a sealing gasket (5).
3. The device for testing the anisotropic permeability of the carbon paper of the fuel cell according to claim 2, wherein the outer walls of the upper clamp (1) and the lower clamp (7) close to one side of the circular air guide groove are provided with second annular mounting grooves, and the inner walls of the two second annular mounting grooves are filled with the same sealing ring (4).
4. The apparatus for testing anisotropic permeability of carbon paper for fuel cells according to claim 1, wherein the inner wall of the air guide port is engraved with threads distributed at equal intervals, and the air guide port is communicated with the circular air guide groove.
5. The device for testing the anisotropic permeability of the carbon paper of the fuel cell according to claim 1, wherein the upper clamp (1) and the lower clamp (7) are connected by eight bolts (3).
6. The device for testing the anisotropic permeability of the carbon paper of the fuel cell as claimed in claim 3, wherein two circular grooves form a cylindrical structure, and two first annular mounting grooves, two second annular mounting grooves and a circular ring air guide groove respectively form a circular ring structure.
7. The apparatus for testing anisotropic permeability of fuel cell carbon paper according to claim 1, wherein the carbon paper sample (6) is replaceable with a gas diffusion layer or a microporous layer; the test gas can be replaced by hydrogen, air or nitrogen; the test gas pressure is 0.01-0.5 MPa.
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| CN202022009555.6U CN214894731U (en) | 2020-09-15 | 2020-09-15 | Device for testing anisotropic permeability of fuel cell carbon paper |
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| CN202022009555.6U CN214894731U (en) | 2020-09-15 | 2020-09-15 | Device for testing anisotropic permeability of fuel cell carbon paper |
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| CN214894731U true CN214894731U (en) | 2021-11-26 |
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