CN2757109Y - Vacuum leakage detector for fuel cell film electrode - Google Patents

Vacuum leakage detector for fuel cell film electrode Download PDF

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Publication number
CN2757109Y
CN2757109Y CN 200420114362 CN200420114362U CN2757109Y CN 2757109 Y CN2757109 Y CN 2757109Y CN 200420114362 CN200420114362 CN 200420114362 CN 200420114362 U CN200420114362 U CN 200420114362U CN 2757109 Y CN2757109 Y CN 2757109Y
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China
Prior art keywords
plate
membrane electrode
movable
fuel cell
fixed
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Expired - Lifetime
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CN 200420114362
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Chinese (zh)
Inventor
胡里清
夏雪均
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Shanghai Shenli Technology Co Ltd
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Shanghai Shen Li High Tech Co Ltd
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Priority to CN 200420114362 priority Critical patent/CN2757109Y/en
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Abstract

The utility model provides a vacuum leakage detector for fuel cell membrane electrodes, which mainly comprises a machine frame, a movable intermediate plate, an air cylinder, a fixed test plate, a movable test plate, a vacuum meter and a cock valve, wherein the machine frame is composed of a top plate, a bottom plate and four guide posts in fixed connection, the movable intermediate plate which is arranged between the top plate and the bottom plate is sheathed on the four guide posts and can move up and down, the air cylinder is installed on the bottom plate, a piston rod of the air cylinder is fixedly connected with the bottom surface of the movable intermediate plate, the fixed test plate is installed at the bottom of the top plate, the bottom of the fixed test plate is provided with an O-shaped sealing ring of which the shape corresponds to that of an inactive sealing region at the periphery of the membrane electrode, the movable test plate is arranged on the movable intermediate plate and can be pushed inward and pulled out, and the movable test plate is also provided with O-shaped sealing ring of which the shape corresponds to that of the inactive sealing region at the periphery of the membrane electrode. The vacuum leakage detector for fuel cell membrane electrodes of the utility model can carry out fast and accurate vacuum leakage detection on the membrane electrodes, so that the production quality and the production efficiency of the membrane electrodes are effectively ensured.

Description

Vacuum leak detection device for fuel cell membrane electrode
Technical Field
The utility model relates to a check out test set especially relates to a vacuum leak hunting device of fuel cell membrane electrode.
Background
A fuel cell is a device that can convert chemical energy generated when a fuel and an oxidant electrochemically react into electrical energy. The core component of the device is a Membrane Electrode (MEA), which consists of a proton exchange Membrane and two conductive porous diffusion materials (such as carbon paper) sandwiched between two surfaces of the Membrane, and finely dispersed catalysts (such as platinum) capable of initiating electrochemical reaction are uniformly distributed on the two side interfaces of the proton exchange Membrane contacting with the conductive materials. The electrons generated in the electrochemical reaction process are led out by conductive objects at two sides of the membrane electrode through an external circuit, thus forming a current loop.
At the anode end of the membrane electrode, fuel can permeate through a porous diffusion material (such as carbon paper) and perform electrochemical reaction on the surface of a catalyst, electrons are lost to form positive ions, and the positive ions can pass through a proton exchange membrane through migration to reach the other end of the membrane electrode, namely the cathode end. At the cathode end of the membrane electrode, a gas (e.g., air) containing an oxidant (e.g., oxygen) permeates through a porous diffusion material (e.g., carbon paper) and electrochemically reacts at the surface of the catalyst to give electrons that form negative ions that further combine with positive ions migrating from the anode end to form a reaction product.
In a proton exchange membrane fuel cell using hydrogen as fuel and air containing oxygen as oxidant (or pure oxygen as oxidant), the fuel hydrogen undergoes a catalytic electrochemical reaction in the anode region without electrons to form hydrogen positive ions (protons), and the electrochemical reaction equation is as follows:
the oxygen gas undergoes a catalyzed electrochemical reaction in the cathode region to produce electrons, forming negative ions which further combine with the positive hydrogen ions migrating from the anode side to form water as a reaction product. The electrochemical reaction equation is as follows:
the function of the proton exchange membrane in a fuel cell, in addition to serving to carry out the electrochemical reaction and to transport the protons produced in the exchange reaction, is to separate the gas flow containing the fuel hydrogen from the gas flow containing the oxidant (oxygen) so that they do not mix with each other and produce an explosive reaction.
In a typical pem fuel cell, the membrane electrode is generally placed between two conductive plates, and the two plates areboth provided with channels, so the membrane electrode is also called as a current-guiding plate. The diversion grooves are arranged on the surface contacted with the membrane electrode and formed by die casting, stamping or mechanical milling and carving, and the number of the diversion grooves is more than one. The flow guide polar plate can be made of metal materials or graphite materials. The diversion trench on the diversion polar plate is used for respectively guiding fuel or oxidant into the anode region or the cathode region at two sides of the membrane electrode. In the structure of a single proton exchange membrane fuel cell, only one membrane electrode and two flow guide polar plates are arranged on two sides of the membrane electrode, one is used as the flow guide polar plate of anode fuel, and the other is used as the flow guide polar plate of cathode oxidant. The two flow guide polar plates are used as current collecting plates and mechanical supports at two sides of the membrane electrode. The diversion trench on the diversion polar plate is a channel for fuel or oxidant to enter the surface of the anode or the cathode, and is a water outlet channel for taking away water generated in the operation process of the battery.
In order to increase the power of the pem fuel cell, two or more single cells are connected together in a stacked or tiled manner to form a stack, or referred to as a cell stack. Such a battery pack is generally fastened together into one body by a front end plate, a rear end plate, and tie rods. In the battery pack, flow guide grooves, called bipolar plates, are arranged on both sides of a polar plate positioned between two proton exchange membranes. One side of the bipolar plate is used as an anode diversion surface of one membrane electrode, and the other side is used as a cathode diversion surface of the other adjacent membrane electrode. A typical battery pack also generally includes: 1) inlet and flow guide channels for fuel and oxidant gases. The fuel (such as hydrogen, methanol or hydrogen-rich gas obtained by reforming methanol, natural gas and gasoline) and oxidant (mainly oxygen or air) are uniformly distributed in the diversion trenches of the anode and cathode surfaces; 2) an inlet and an outlet for cooling fluid (such as water) and a flow guide channel. The cooling fluid is uniformly distributed in the cooling channels in each battery pack to absorb the reaction heat generated in the fuel cell and carry the reaction heat out of the battery pack for heat dissipation; 3) the outlets of the fuel and oxidant gases and the flow guide channel. The function of the device is to discharge the excessive fuel gas and oxidant which do not participate in the reaction, and simultaneously carry out the liquid or gaseous water generated by the reaction. The fuel inlet/outlet, the oxidant inlet/outlet, and the cooling fluid inlet/outlet are typically provided on one end plate or on both end plates of the fuel cell stack.
The proton exchange membrane fuel cell can be used as a power system of vehicles such as vehicles and ships, and can also be manufactured into a portable, movable or fixed power generation device.
The three-in-one membrane electrode is the core component of the fuel cell, the quality of the membrane electrode is the key for determining the performance of the whole fuel cell, and the membrane electrode can not allow fuel hydrogen and air on the two sides of the membrane electrode to pass through each other except protons generated in the migration exchange reaction so as to prevent the membrane electrode from being mixed with each other and exploding. That is, the membrane electrode must not leak gas, and detecting whether the membrane electrode leaks gas is an important part for quality control of the membrane electrode. In practical production, the quality of air leakage of each membrane electrode must be strictly checked, so that a device for rapidly and accurately detecting the vacuum leakage of the membrane electrode must be designed to ensure the quality and the production efficiency of the membrane electrode.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a can be fast can accurately carry out the vacuum leak hunting device of fuel cell membrane electrode of vacuum leak hunting to the membrane electrode again to ensure the quality and the production efficiency of membrane electrode.
The purpose of the utility model is realized like this: a vacuum leak detection device for a fuel cell membrane electrode comprises a frame, a movable middle plate, an air cylinder, a fixed detection plate, a movable detection plate, a vacuum gauge and a rotary valve; the rack is formed by fixedly connecting a top plate, a bottom plate and four guide columns; the movable middle plate is arranged between the top plate and the bottom plate, is sleeved on the four guide posts in a penetrating manner and can move up and down; the air cylinder is arranged on the bottom plate, and a piston rod of the air cylinder is fixedly connected with the bottom surface of the movable middle plate; the fixed detection plate is arranged below the top plate, the bottom of the fixed detection plate is provided with an O-shaped sealing ring corresponding to the shape of the peripheral inactive sealing area of the membrane electrode, two pore channels are arranged in the fixed detection plate, the two pore channels respectively extend from two end surfaces to the inside of the sealing ring and are communicated downwards, and openings of the two end surfaces are respectively connected with a connecting pipe; the movable detection plate is placed on the movable middle plate and can be pushed and pulled out, and an O-shaped sealing ring corresponding to the shape of the peripheral inactive sealing area of the membraneelectrode is arranged on the movable middle plate; the vacuum meter is arranged on the top plate and is communicated with the connecting pipe on one end face of the fixed detection plate through a hose; the rotary valve is arranged on the top plate, one end of the rotary valve is connected with the vacuumizing mechanism, and the other end of the rotary valve is connected with the connecting pipe which is used for fixing the other end face of the detection plate.
And a positioning mechanism of a movable detection plate is arranged on the movable middle plate.
The O-shaped sealing ring which is arranged on the fixed detection plate and corresponds to the shape of the peripheral inactive sealing area of the membrane electrode and the O-shaped sealing ring which is arranged on the movable detection plate and corresponds to the shape of the peripheral inactive sealing area of the membrane electrode are mutually corresponding and can be matched.
And positioning pins matched with the positioning holes on the membrane electrode are respectively arranged on two opposite corners of the movable detection plate.
The air inlet of the air cylinder is connected with a pneumatic switch, and the pneumatic switch is externally connected with an air compressor.
The middle part of the fixed middle plate is provided with a middle hole allowing a cylinder piston to pass through, and the periphery of the fixed middle plate is provided with a frame extending upwards.
And a handle is arranged on the outer side surface of the movable detection plate.
The utility model discloses fuel cell membrane electrode's vacuum leak hunting device can carry out vacuum leak hunting to membrane electrode fast, accurately, provides effective guarantee for ensureing the production quality and the production efficiency of membrane electrode.
Drawings
Fig. 1 is a three-dimensional structure diagram of a vacuum leak detection device for a fuel cell membrane electrode according to the present invention.
Detailed Description
Referring to fig. 1, the vacuum leak detection device for a fuel cell membrane electrode of the present invention includes a frame 1, a movable intermediate plate 2, a cylinder 3, a fixed detection plate 4, a movable detection plate 5, a vacuum gauge 6, a rotary valve 7, and a fixed intermediate plate 8. The frame 1 is formed by fixedly connecting a top plate 11, a bottom plate 12 and four guide posts 13. The movable middle plate 2 is arranged between the top plate 11 and the bottom plate 12, is sleeved on four guide posts 13 in a penetrating way and can move up and down, and a positioning mechanism of the movable detection plate 5 is arranged on the movable middle plate 2. The cylinder 3 is installed on the bottom plate 12, a piston rod of the cylinder penetrates through the fixed middle plate 8 to be fixedly connected with the bottom surface of the movable middle plate 2, a pneumatic switch 31 is connected to an air inlet of the cylinder, and the pneumatic switch 31 is externally connected with an air compressor. The fixed detection plate 4 is installed under the top plate 11, the bottom of the fixed detection plate is provided with an O-shaped sealing ring (in the embodiment, an octagonal O-shaped sealing ring) corresponding to the shape of the peripheral inactive sealing area of the membrane electrode, two pore channels are arranged in the fixed detection plate, the two pore channels respectively extend from two end faces to the inside of the sealing ring and penetrate downwards, and openings on the two end faces are respectively connected with a connecting pipe. The movable detection plate 5 is placed on the movable middle plate 2 and can be pulled in and out, an O-shaped sealing ring 51 (an octagonal O-shaped sealing ring in the embodiment) corresponding to the shape of the peripheral inactive sealing area of the membrane electrode is arranged on the movable middle plate, and the sealing ring 51 and the O-shaped sealing ring which is arranged on the fixed detection plate and corresponds to the shape of the peripheral inactive sealing area of the membrane electrode are matched with each other; two opposite corners of the movable detection plate 5 are respectively provided with a positioning pin 52 matched with the positioning hole on the electrode plate; the outer side surface of the movable detection plate is provided with a handle 53. The vacuum meter 6 is arranged on the top plate and is communicated with the connecting pipe on one end face of the fixed detection plate through a hose. The rotary valve 7 is arranged on the top plate, one end of the rotary valve is connected with the vacuumizing mechanism, and the other end of the rotary valve is connected with a connecting pipe for fixing the other end face of the detection plate. The fixed middle plate 8 is arranged below the movable middle plate and is fixed on the four guide posts in an inserting mode, a middle hole allowing a cylinder piston to penetrate through is formed in the middle of the fixed middle plate, and a frame extending upwards is arranged on the periphery of the fixed middle plate.
The working process principle of the vacuum leak detection device for the fuel cell membrane electrode of the present invention can be described as follows with reference to fig. 1:
firstly, a pressure regulating valve connected with an air compressor is opened to regulate the pressure of gas at an outlet of the pressure regulating valve to be 0.5-0.6 Mpa, and then a handle of a pneumatic switch 31 connected to an air cylinder 3 is turned left to enable an air cylinder piston to retract. The movable intermediate plate 2 guided by the 4 guide posts 13 is driven to move downwards until the stroke of the cylinder is finished, so that an operation space is formed between the movable intermediate plate 2 and the top plate 11.
Then the movable detection plate 5 is pulled out, the membrane electrode to be detected is placed on an O-shaped sealing ring of the movable detection plate 5, the shape of the O-shaped sealing ring corresponds to the shape of the peripheral inactive sealing area of the membrane electrode, and positioning holes at the opposite corners of the membrane electrode penetrate into positioning pins 52 at the opposite corners of the movable detection plate 5, so that the membrane electrode is accurately positioned. Then the movable detecting plate 5 is placed in a positioning mechanism on the movable middle plate 2, so that the membrane electrode placed on the movable detecting plate 5 is just positioned below an O-shaped sealing ring on the fixed detecting plate 4, wherein the shape of the O-shaped sealing ring corresponds to the shape of the peripheral inactive sealing area of the membrane electrode. Then the handle of the pneumatic switch 31 is turned right to drive the cylinder piston to drive the movable middle plate 2 to move upwards, so that the upper plane of the frame of the membrane electrode and the O-shaped sealing ring on the fixed detection plate, which corresponds to the shape of the peripheral inactive sealing area of the membrane electrode, are pressed to be in a sealing state, the lower plane of the frame of the membrane electrode and the O-shaped sealing ring on the movable detection plate, which corresponds to the shape of the peripheral inactive sealing area of the membrane electrode, are pressed to be in a sealing state, and at the moment, the upper and lower O-shaped sealing rings, which correspond to the shape ofthe peripheral inactive sealing area of the membrane. Then opening the rotary valve 7, starting a vacuum pump, pumping out air between the membrane electrode and the fixed detection plate 4, enabling the vacuum degree to reach 1 mm mercury column, closing the rotary valve, and observing the pressure change on the vacuum meter 6, wherein if the pressure meter pointer can be kept still within about 20-30 seconds, the membrane electrode has no air leakage phenomenon, and the quality is qualified; if the pointer of the pressure gauge rotates, the vacuum degree can not be maintained, which indicates that the membrane electrode has air leakage and unqualified quality.
After the detection is finished, the handle of the pneumatic switch 31 is turned left, so that the cylinder piston retracts to the original position, the movable detection plate 5 is pulled out, the membrane electrode is taken down and placed in the working box, and the detection of one membrane electrode is finished.

Claims (7)

1. A vacuum leak detection device for a membrane electrode of a fuel cell is characterized in that: comprises a frame, a movable middle plate, a cylinder, a fixed detection plate, a movable detection plate, a vacuum gauge and a rotary valve; the rack is formed by fixedly connecting a top plate, a bottom plate and four guide columns; the movable middle plate is arranged between the top plate and the bottom plate, is sleeved on the four guide posts in a penetrating manner and can move up and down; the air cylinder is arranged on the bottom plate, and a piston rod of the air cylinder is fixedly connected with the bottom surface of the movable middle plate; the fixed detection plate is arranged below the top plate, the bottom of the fixed detection plate is provided with an O-shaped sealing ring corresponding to the shape of the peripheral inactive sealing area of the membrane electrode, two pore channels are arranged in the fixed detection plate, the two pore channels respectively extend from two end surfaces to the inside of the sealing ring and are communicated downwards, and openings of the two end surfaces are respectively connected with a connecting pipe; the movable detection plate is placed on the movable middle plate and can be pushed and pulled out, and an O-shaped sealing ring corresponding to the shape of the peripheral inactive sealing area of the membrane electrode is arranged on the movable middle plate; the vacuum meter is arranged on the top plate and is communicated with the connecting pipe on one end face of the fixed detection plate through a hose; the rotary valve is arranged on the top plate, one end of the rotary valve is connected with the vacuumizing mechanism, and the other end of the rotary valve is connected with the connecting pipe which is used for fixing the other end face of the detection plate.
2. The vacuum leak detection apparatus for a fuel cell membrane electrode according to claim 1, wherein: and a positioning mechanism of a movable detection plate is arranged on the movable middle plate.
3. The vacuum leak detection apparatus for a fuel cell membrane electrode according to claim 1, wherein: the O-shaped sealing ring which is arranged on the fixed detection plate and corresponds to the shape of the peripheral inactive sealing area of the membrane electrode and the O-shaped sealing ring which is arranged on the movable detection plate and corresponds to the shape of the peripheral inactive sealing area of the membrane electrode are mutually corresponding and can be matched.
4. The vacuum leak detection apparatus for a fuel cell membrane electrode according to claim 1, wherein: and positioning pins matched with the positioning holes on the membrane electrode are respectively arranged on two opposite corners of the movable detection plate.
5. The vacuum leak detection apparatus for a fuel cell membrane electrode according to claim 1, wherein: the air inlet of the air cylinder is connected with a pneumatic switch, and the pneumatic switch is externally connected with an air compressor.
6. The vacuum leak detection apparatus for a fuel cell membrane electrode according to claim 1, wherein: the middle part of the fixed middle plate is provided with a middle hole allowing a cylinder piston to pass through, and the periphery of the fixed middle plate is provided with a frame extending upwards.
7. The vacuum leak detection apparatus for a fuel cell membrane electrode according to claim 1, wherein: and a handle is arranged on the outer side surface of the movable detection plate.
CN 200420114362 2004-12-16 2004-12-16 Vacuum leakage detector for fuel cell film electrode Expired - Lifetime CN2757109Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200420114362 CN2757109Y (en) 2004-12-16 2004-12-16 Vacuum leakage detector for fuel cell film electrode

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Application Number Priority Date Filing Date Title
CN 200420114362 CN2757109Y (en) 2004-12-16 2004-12-16 Vacuum leakage detector for fuel cell film electrode

Publications (1)

Publication Number Publication Date
CN2757109Y true CN2757109Y (en) 2006-02-08

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101876580A (en) * 2010-03-19 2010-11-03 常州亿晶光电科技有限公司 Detection device of quartz tube in cell coating equipment and application method thereof
CN104006925A (en) * 2014-05-16 2014-08-27 江苏绿遥燃料电池系统制造有限公司 Quick leak detecting device of fuel cell film electrodes
CN104060655A (en) * 2014-06-13 2014-09-24 宁波新冠联机电有限公司 Detection equipment of food waste processor
CN111307383A (en) * 2018-12-12 2020-06-19 中国科学院大连化学物理研究所 Device for detecting sealing performance and open-circuit voltage of fuel cell membrane electrode

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101876580A (en) * 2010-03-19 2010-11-03 常州亿晶光电科技有限公司 Detection device of quartz tube in cell coating equipment and application method thereof
CN104006925A (en) * 2014-05-16 2014-08-27 江苏绿遥燃料电池系统制造有限公司 Quick leak detecting device of fuel cell film electrodes
CN104006925B (en) * 2014-05-16 2016-09-21 江苏绿遥燃料电池系统制造有限公司 A kind of fuel cell membrane electrode fast leakage detection apparatus
CN104060655A (en) * 2014-06-13 2014-09-24 宁波新冠联机电有限公司 Detection equipment of food waste processor
CN104060655B (en) * 2014-06-13 2015-07-15 宁波新冠联机电有限公司 Detection equipment of food waste processor
CN111307383A (en) * 2018-12-12 2020-06-19 中国科学院大连化学物理研究所 Device for detecting sealing performance and open-circuit voltage of fuel cell membrane electrode

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
AV01 Patent right actively abandoned

Effective date of abandoning: 20090624

C25 Abandonment of patent right or utility model to avoid double patenting