CN217822891U - Fuel cell stack air tightness testing device - Google Patents
Fuel cell stack air tightness testing device Download PDFInfo
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- CN217822891U CN217822891U CN202221429300.8U CN202221429300U CN217822891U CN 217822891 U CN217822891 U CN 217822891U CN 202221429300 U CN202221429300 U CN 202221429300U CN 217822891 U CN217822891 U CN 217822891U
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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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- Y02E60/30—Hydrogen technology
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Abstract
The utility model provides a fuel cell pile gas tightness testing arrangement, testing arrangement wherein includes: a source of pressurized fluid; the fuel cell stack comprises a fuel cell stack, an air inlet pipeline assembly and a fuel cell stack, wherein one end of the air inlet pipeline assembly is communicated with a pressure fluid source through a pressure control component, the air inlet pipeline assembly comprises a flow test pipeline assembly, the flow test pipeline assembly is provided with a first flowmeter and comprises a plurality of first branch pipes which are connected in parallel, and the fluid outlet ends of the plurality of first branch pipes can be respectively in one-to-one correspondence controllable communication with a plurality of chambers of the fuel cell stack; and each emptying pipeline component is connected with a second flowmeter in series. The utility model discloses can accurately obtain the leakage quantity of corresponding certain cavity to other each cavities to can obtain the outer leakage quantity of aforementioned certain cavity under same pressure through the difference to the variable quantity of first flowmeter and second flowmeter, the test result is accurate, can effectively reduce test time and test cost, improves efficiency of software testing.
Description
Technical Field
The utility model belongs to the technical field of fuel cell pile gas tightness detects, concretely relates to fuel cell pile gas tightness testing arrangement.
Background
The fuel cell, especially the proton exchange membrane fuel cell, has the advantages of high energy density, high efficiency, no noise, zero emission and the like, so that the fuel cell becomes a hotspot and a key point of the development of the current energy and power industries, has a very wide application prospect, and is considered to be one of the optimal schemes for solving energy crisis and environmental pollution in the new century. The fuel cell pile is formed by connecting a plurality of monocells in series in a direct-stacking mode to form a battery pack, a cavity for flowing an oxidant, a cavity for flowing a fuel agent and a cavity for flowing a coolant are arranged inside the battery pack, and the cavities are mutually sealed and isolated. When the sealing between the cavities is not good, the efficiency of the fuel cell is reduced if the sealing is not good, and explosion accidents are caused if the sealing is not good. Therefore, after the fuel cell stack is assembled, a gas tightness test must be performed to check the leakage and the cross leakage of the three chambers, and when the leakage rate exceeds a predetermined value, the product is determined to be a defective product. Therefore, the air tightness test is one of the key links for ensuring the use safety of the fuel cell stack and improving the cell efficiency.
In the prior art, a test method for automatically detecting internal leakage and external leakage of a fuel cell stack is provided, when the internal leakage of the stack is tested, gas flows to a relatively high-pressure cavity through a straight main pipe, and the leaked gas enters a corresponding branch pipe and a flowmeter bypass from another cavity to obtain the internal leakage amount of the relatively high-pressure cavity to the other cavity; according to the leakage quantity of the outer leakage of the relatively high pressure cavity under the same pressure, the actual leakage quantity of the inner leakage is calculated, and the test method has certain defects: firstly, the pressure for pressure maintaining inside the galvanic pile is different when measuring inner leakage and outer leakage, and when the pressure maintaining pressure is different, the outer leakage under the same pressure needs to be tested before the inner leakage is tested; secondly, in the testing process, the external leakage of only one cavity can be tested each time, which can lead to the great increase of the testing time and the testing cost.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model provides a fuel cell pile gas tightness testing arrangement can overcome the interior not enough that leaks test time and test cost increase by a wide margin of the gas tightness testing arrangement among the correlation technique.
In order to solve the above problem, the utility model provides a fuel cell stack gas tightness testing arrangement, include:
a source of pressurized fluid;
the fuel cell stack comprises a pressure source, an air inlet pipeline assembly and a fuel cell stack, wherein one end of the air inlet pipeline assembly is communicated with the pressure fluid source through a pressure control component, the air inlet pipeline assembly comprises a flow testing pipeline assembly, the flow testing pipeline assembly is provided with a first flowmeter and comprises a plurality of first branch pipes connected in parallel, and fluid outlet ends of the first branch pipes can be respectively in controllable communication with a plurality of chambers of the fuel cell stack in a one-to-one correspondence manner;
and the emptying pipeline assemblies are respectively in one-to-one correspondence with the chambers and are controllably communicated with each other, and each emptying pipeline assembly is connected with a second flowmeter in series.
In some embodiments of the present invention, the substrate is,
the flow test pipeline assembly is provided with a first main pipe, the first flow meters are connected onto the first main pipe in series, and the first branch pipes connected in parallel are positioned at the fluid outlet ends of the first flow meters.
In some embodiments of the present invention, the substrate is,
the air inlet pipeline assembly further comprises a through pipeline assembly connected with the flow testing pipeline assembly in parallel, the through pipeline assembly is provided with a second main pipe and a plurality of second branch pipes, the second main pipe and the first main pipe are connected in parallel and are connected to the fluid outlet end of the pressure control component, the fluid outlet ends of the second branch pipes are respectively in one-to-one correspondence controllable communication with the plurality of chambers, and the first branch pipes and the second branch pipes communicated with the chambers are connected in parallel.
In some embodiments of the present invention, the substrate is,
each emptying pipeline assembly is provided with a first emptying valve and a second emptying valve, wherein the first emptying valve is located at the fluid outlet end of the second flowmeter, and the second emptying valve is located at the fluid inlet end of the second flowmeter.
In some embodiments of the present invention, the substrate is,
the pressure fluid source comprises an air source and a pressure reducing valve, and the pressure reducing valve is arranged between the pressure control component and the air source.
In some embodiments of the present invention, the substrate is,
the device comprises a device box body, wherein the air inlet pipeline assembly and the emptying pipeline assembly are integrally assembled in the device box body.
In some embodiments of the present invention, the substrate is,
the device box is provided with a display unit, and the display unit can acquire and display the flow parameters of the first flowmeter and the second flowmeter and the pressure parameters of the pressure control component.
The utility model provides a pair of fuel cell galvanic pile gas tightness testing arrangement, detect the fluid flow change in the air inlet pipeline subassembly through first flowmeter, detect the fluid flow change in the evacuation pipeline subassembly through the second flowmeter, thereby can accurately obtain the string leakage quantity of a certain corresponding cavity to other each cavity (also be the interior leakage quantity of a certain cavity), and can obtain the outer leakage quantity of aforementioned a certain cavity under same pressure through the difference to the variable quantity of first flowmeter and second flowmeter, the test result is accurate, can effectively reduce test time and test cost, improve efficiency of software testing; the arrangement of each second flowmeter can accurately measure the series flow of the tested chamber to other adjacent chambers when the internal leakage (series leakage) of each chamber is tested, and the external leakage under the same pressure as that of the test series leakage is required to be separately obtained when the series leakage is tested, and then difference calculation is carried out, so that the time and the cost are obviously reduced.
Drawings
Fig. 1 is a schematic diagram of a fuel cell stack airtightness testing apparatus according to an embodiment of the present invention (including a fuel cell stack);
fig. 2 is a schematic structural diagram of a fuel cell stack gas tightness testing device according to an embodiment of the present invention (including a fuel cell stack).
The reference numerals are represented as:
1. a gas source; 2. a pressure reducing valve; 3. a pressure control part; 4. a first electrically controlled block valve; 5. a second electrically controlled block valve; 6. a third electrically controlled block valve; 7. a fourth electrically controlled block valve; 8. a fifth electric control block valve; 9. A sixth electrically controlled block valve; 10. a seventh electrically controlled block valve; 11. a first purge valve; 12. a second purge valve; 17. a first flow meter; 18. a second flow meter; 21. a fuel cell stack; 22. a device case; 23. A display unit.
Detailed Description
Referring to fig. 1 to 2 in combination, according to an embodiment of the present invention, there is provided a fuel cell stack airtightness testing apparatus, including: a pressure fluid source, wherein the fluid can be gas or liquid, and when the fluid is gas, one of nitrogen or helium can be adopted; the fuel cell stack comprises a fuel cell stack 21, an air inlet pipeline assembly and a fuel cell stack control device, wherein one end of the air inlet pipeline assembly is communicated with a pressure fluid source through a pressure control component 3 (specifically a pressure control component), the air inlet pipeline assembly comprises a flow test pipeline assembly, the flow test pipeline assembly is provided with a first flowmeter 17 and comprises a plurality of first branch pipes which are connected in parallel, and fluid outlet ends of the plurality of first branch pipes can be respectively in controllable communication with a plurality of chambers of the fuel cell stack 21 in a one-to-one correspondence manner; and the plurality of emptying pipeline assemblies are respectively in controllable communication with the plurality of chambers in a one-to-one correspondence manner, and each emptying pipeline assembly is connected with a second flowmeter 18 in series.
In the technical scheme, the change of the fluid flow in the air inlet pipeline assembly is detected through the first flowmeter 17, and the change of the fluid flow in the emptying pipeline assembly is detected through the second flowmeter 18, so that the leakage quantity of a corresponding certain chamber to other chambers (namely the inner leakage quantity of the certain chamber) can be accurately obtained, the outer leakage quantity of the certain chamber under the same pressure can be obtained through the difference of the variation quantity of the first flowmeter 17 and the second flowmeter 18, the test result is accurate, the test time and the test cost can be effectively reduced, and the test efficiency is improved. It should be noted that, in this embodiment, the second flow meters 18 are arranged to accurately measure the flow rates of the chambers to be tested to other adjacent chambers when performing the internal leakage (cross-leak) test of each chamber, without separately acquiring the external leakage at the same pressure as that of the cross-leak test, and then performing the difference calculation, which is required in the prior art, so that the time and the cost are significantly reduced.
In some embodiments, the flow test pipeline assembly has a first main pipe, the first flow meter 17 is connected in series to the first main pipe, and the plurality of parallel first branch pipes are located at the fluid outlet end of the first flow meter 17, so that accurate measurement of the fluid entering the different chambers can be realized by switching on and off each first branch pipe by only one first flow meter 17 arranged in the flow test pipeline assembly, and the manufacturing cost of the device is further reduced. Specifically, as shown in fig. 1, for a fuel cell stack 21, three chambers which should be sealed and independent from each other are provided, which are an oxidant chamber, a coolant chamber and a fuel chamber, a second electronically controlled block valve 5 is connected in series to a first branch pipe which is communicated with the oxidant chamber, a third electronically controlled block valve 6 is connected in series to the first branch pipe which is communicated with the coolant chamber, a fourth electronically controlled block valve 7 is connected in series to the first branch pipe which is communicated with the fuel chamber, and the second electronically controlled block valve 5, the third electronically controlled block valve 6 and the fourth electronically controlled block valve 7 are controlled to be turned on when a leakage test needs to be performed on the chambers which are communicated with the chambers, so that selective on-off control of each first branch pipe is realized.
In some embodiments, the intake pipeline assembly further includes a straight-through pipeline assembly connected in parallel with the flow rate testing pipeline assembly, the straight-through pipeline assembly has a second main pipe and a plurality of second branch pipes, the second main pipe and the first main pipe are connected in parallel and are all connected to the fluid outlet end of the pressure control unit 3, the fluid outlet ends of the plurality of second branch pipes are respectively in controllable communication with the plurality of chambers in a one-to-one correspondence manner, and the first branch pipe and the second branch pipe communicated with each chamber are connected in parallel. It can be understood that, similar to the arrangement of the flow test pipeline assembly, the main difference between the straight-through pipeline assembly and the flow test pipeline assembly is that the first flow meter 17 is not separately arranged in the straight-through pipeline assembly, so that the pipeline assembly can be controlled to be opened when the corresponding chamber needs to be rapidly inflated, and the efficiency of the test operation is improved. Referring to fig. 1, a fifth electrically controlled block valve 8 is connected in series to the second branch pipe communicated with the oxidant chamber, a sixth electrically controlled block valve 9 is connected in series to the second branch pipe communicated with the coolant chamber, a seventh electrically controlled block valve 10 is connected in series to the second branch pipe communicated with the fuel agent chamber, and the fifth electrically controlled block valve 8, the sixth electrically controlled block valve 9 and the seventh electrically controlled block valve 10 are controlled to be blocked when a leakage test needs to be performed on the chambers communicated with the chambers, so that selective on-off control of each first branch pipe is realized
Furthermore, the second main pipe is provided with a first electric control cut-off valve 4, especially when the length of a pipeline in a corresponding straight-through pipeline assembly is large, the effect of the containing cavity is achieved, and the arrangement of the first electric control cut-off valve 4 can effectively inhibit pressure fluctuation and realize rapid and stable flow of gas.
In some embodiments, each evacuation line assembly has a first evacuation valve 11 and a second evacuation valve 12 disposed thereon, wherein the first evacuation valve 11 is at a fluid outlet end of the second flow meter 18, and the second evacuation valve 12 is at a fluid inlet end of the second flow meter 18. In a specific testing process, when the corresponding chamber needs to be evacuated, the second evacuation valve 12 is preferably controlled to be opened, that is, the evacuation fluid in the corresponding chamber does not flow through the second flowmeter 18, so that evacuation can be faster, the testing efficiency is higher, and when the leakage amount (cross leakage amount) needs to be tested for the corresponding chamber, the corresponding first evacuation valve 11 is controlled to be opened.
The pressure fluid source comprises a gas source 1 and a pressure reducing valve 2, the pressure reducing valve 2 is arranged between the pressure control part 3 and the gas source 1, and the pressure reducing valve 2 can reduce the airflow of the high-pressure gas source 1 to a required pressure value and prevent the structure of the fuel cell stack 21 from being damaged by overhigh fluid pressure.
Referring to fig. 2, the fuel cell stack airtightness testing apparatus further includes an apparatus box 22, and the air inlet pipe assembly and the evacuation pipe assembly are integrally assembled in the apparatus box 22, so that the apparatus is structurally integrated and more compact, and the pressure fluid source is detachably connected to the outside of the apparatus box 22, so that the apparatus has a wider application range, for example, a movable compressor may be used as the air source 1, and a compressed air pipe in a factory workshop may also be used as the air source 1. The device box 22 is provided with a display unit 23, and the display unit 23 can acquire and display the flow parameters of the first flowmeter 17 and the second flowmeter 18 and the pressure parameter of the pressure control component 3, so that the corresponding test result can be displayed intuitively.
According to the utility model discloses an embodiment still provides a test method based on foretell fuel cell stack gas tightness testing arrangement, includes: controlling the air inlet pipeline assembly to inflate the air into the plurality of chambers to a first preset pressure value, when the pressure in each chamber is at the first preset pressure value (150 kPa in a specific embodiment, various pressures in the present invention refer to gauge pressure, but not absolute pressure), the state where the corresponding fuel cell stack airtightness testing apparatus is located is a test initial state, specifically, at this time, the first electronic control blocking valve 4, the fifth electronic control blocking valve 8, the sixth electronic control blocking valve 9, and the seventh electronic control blocking valve 10 are turned on, the second electronic control blocking valve 5, the third electronic control blocking valve 6, the fourth electronic control blocking valve 7, the first exhaust valve 11, and the second exhaust valve 12 are all in a blocking state (i.e., a closed state), and the outlet pressure of the pressure control component 3 is adjusted to the first preset pressure value; respectively testing the leakage amount outside the single cavity corresponding to each cavity of the fuel cell stack 21; after the leakage rate outside the single cavity corresponding to each cavity is tested respectively, controlling each cavity to recover to the initial test state; the multiple chambers were then further tested for total external leakage.
Among this technical scheme, once aerify and make each cavity maintain in first preset pressure value, let out leakage quantity test and finish the back outside single cavity and make every cavity of device all recover test initial condition, further carry out the test of the total outer leakage quantity of each cavity, need not to further aerify each cavity, simplify the control flow, make the leakage quantity test flow of difference link up each other, can have higher efficiency of software testing, reduce test time and cost.
In some embodiments, when the direct pipe assembly is included, the direct pipe assembly is communicated with the corresponding chamber before the leakage amount or the leakage string amount outside at least one of the plurality of chambers is tested, and when the leakage amount or the leakage string amount outside at least one of the plurality of chambers is tested, the flow testing pipe assembly is communicated with the corresponding chamber, that is, each chamber is inflated by the direct pipe assembly before the leakage amount test is performed, the inflation is not limited by the upper nominal flow limit of the first flowmeter 17, so that the gauge pressure of each chamber can reach the first preset pressure value more quickly, and the flow testing pipe assembly is adopted to accurately detect the variation condition of the flow amount in the corresponding chamber by the first flowmeter 17 when the leakage amount test is performed.
As a specific implementation manner, the leakage amount outside the single cavity is obtained through the following steps: the cut-off of the second branch pipe corresponding to the tested chamber and the communication of the first branch pipe are controlled, and other chambers and the pressure control part 3 are controlled to be kept at a first preset pressure value; the first change value of the first flow meter 17 is acquired after the first preset time is maintained. Specifically, for example, taking the tested chamber as the oxidant chamber, at this time, the tested chamber is communicated with the second electrically controlled block valve 5 on the corresponding first branch pipe, the fifth electrically controlled block valve 8 on the second branch pipe is blocked, and other electrically controlled block valves and evacuation valves in the device are all in the initial test state (i.e., all in the blocked or closed state), and the pressure is maintained for 15min at the first preset pressure value, during which the reading of the first flowmeter 17 is the leakage amount outside the single chamber of the oxidant chamber; similarly, the coolant cavity and the fuel agent cavity are respectively and correspondingly operated, the leakage amount outside the single cavities of the two cavities is respectively obtained, the process can be seen, only the electric control cut-off valve of the corresponding first branch pipe needs to be communicated for each cavity, the electric control cut-off valve of the second branch pipe can be cut off, the operation and control logic is very simple, the initial test state is recovered, and the test efficiency is improved.
After the single-chamber external leakage quantity test of each chamber is finished, the communication of the second branch pipe corresponding to the tested chamber and the cut-off of the first branch pipe are controlled, so that the chamber is recovered to the initial test state, and as mentioned above, the recovery of the initial test state only needs to open and close two electric control cut-off valves on the second branch pipe and the first branch pipe in actual operation. The total external leakage amount is obtained through the following steps: the cut-off of the second branch pipe and the communication of the first branch pipe which respectively correspond to each test chamber are controlled; after a second predetermined time (for example, 60min may be used), a second variation value of the first flow meter 17 is obtained. Specifically, at this time, the first electronic cut-off valve 4, the fifth electronic cut-off valve 8, the sixth electronic cut-off valve 9, the seventh electronic cut-off valve 10, each of the first exhaust valves 11, and the second exhaust valve 12 are all cut off, the second electronic cut-off valve 5, the third electronic cut-off valve 6, and the fourth electronic cut-off valve 7 are all in a conducting state, and the reading on the first flowmeter 17 is the total external leakage amount of all the chambers, that is, the total external leakage amount. It should be noted that, in this test procedure, the total external leakage amount test can be implemented only by cutting off the electrically controlled cut-off valves on the three second branches in the initial test state and turning on the electrically controlled cut-off valves on the three first branches, and the control is simple and convenient.
As a more preferable implementation manner, after the total leakage value test is completed, the method further includes: adjusting the outlet pressure of the pressure control component 3 to be zero (gauge pressure), so as to ensure that subsequent related chambers can be evacuated to a state where the pressure in the chambers is zero, and controlling one of the chambers to be evacuated to a second preset pressure value where the pressure in the chambers is higher than zero, wherein it can be understood that the second preset pressure value is lower than the first preset pressure value, and controlling the remaining chambers in the chambers to be evacuated to a state where the pressure in the chambers is zero, and for the convenience of clear description, the chamber whose pressure in the chambers is the second preset pressure value is defined as the first chamber; the first chamber was tested for breakthrough. In the technical scheme, based on the requirement of the internal leakage amount test of each cavity, after the process of the total external leakage amount after the test is finished, the cavity of the first preset pressure value is directly emptied to form the second preset pressure value and zero, so that perfect connection in the process is formed, the process does not need to be controlled independently to change the on-off state of each pipeline, the pressure regulation of the relevant cavity can be realized through unidirectional emptying, the test process is further optimized and simplified, and the test efficiency is improved. The second preset pressure may be, for example, 50kPa or 100kPa, and the second preset pressures corresponding to different chambers may be the same or different, and may be selected according to actual requirements.
Further, the method further includes a step of testing the leakage of any one of the plurality of chambers remaining after the first chamber is tested after the leakage of the first chamber is tested, and for simplifying the description, any one of the chambers is defined as a second chamber, so that the leakage of each chamber is tested.
Specifically, the leakage amount of the first chamber or the second chamber is obtained by the following steps: adjusting the outlet pressure of the pressure control component 3 to a second preset pressure value, and controlling the evacuation pipeline assembly connected with the first chamber or the second chamber to be in a blocking state (that is, the first evacuation valve 11 and the second evacuation valve 12 thereon are both in a blocking state), and the first evacuation valve 11 and the second evacuation valve 12 in the evacuation pipeline assemblies connected with other chambers are in an evacuation state and in a blocking state; and after the third preset time, acquiring the change values of the second flow meters 18 connected with other chambers and summing the change values to obtain a third change value. Furthermore, the testing method further comprises a step of obtaining the leakage of the first chamber or the second chamber, and specifically comprises the following steps: the fourth variation value of the first flow meter 17 is acquired at the same time as the third variation value, and the fifth variation value is obtained by subtracting the fourth variation value from the third variation value. Taking the example of testing the leakage amount of the oxidant cavity as an example, at this time, the first evacuation valve 11 in the evacuation pipeline assembly connected with the coolant cavity and the fuel cavity is communicated, the second evacuation valve 12 is closed, the first evacuation valve 11 and the second evacuation valve 12 in the evacuation pipeline assembly communicated with the oxidant cavity are both closed, the pressure is maintained at the second preset pressure assumed to be 50kPa15min, and the sum of the readings of the second flow meter 18 in the evacuation pipeline assembly connected with the coolant cavity and the fuel cavity is the leakage amount of the oxidant cavity. At this time, the reading of the first flowmeter 17 is the sum of the external leakage amount and the serial leakage amount of the oxidant cavity, and the difference between the reading of the first flowmeter 17 and the sum of the readings of the two second flowmeters 18 is the external leakage amount of the oxidant cavity under the second preset pressure, that is, the serial leakage amount and the external leakage amount of the single cavity of the tested cavity under the same preset pressure can be obtained simultaneously in the same process, so that the test efficiency is higher, the test result is more accurate, and the test result is richer.
It should be noted that, in the process that each chamber is kept at the first preset pressure value or the second preset pressure value, if the pressure is too high, the second evacuation valve 12 of the corresponding chamber is controlled to release the pressure, so that the pressure of the corresponding chamber is maintained at the corresponding preset pressure value.
A preferred embodiment of the present invention will be described with reference to fig. 1 and 2.
The utility model also provides a fuel cell pile gas tightness test method, based on as above fuel cell pile testing arrangement, after gas supply installation, gas tightness testing arrangement and the three device of fuel cell pile passed through the tube coupling, at first the manual 1 switch of air supply of opening, adjust relief pressure valve 2, make it be less than 1MPa, then whole test procedure can be accomplished by a key, specific test method and control logic include following several steps:
1. single-cavity air tightness test method (namely method for obtaining single-cavity outdoor leakage quantity)
(1) Oxidant chamber testing
a. The system automatically opens the first electric control block valve 4, the fifth electric control block valve 8, the sixth electric control block valve 9 and the seventh electric control block valve 10, adjusts the outlet pressure value (for example, 0.3 MPa) of the pressure control component 3, and rapidly inflates the three cavities;
b. when the gauge pressure in the three cavities reaches the required value such as 150KPa (the average gauge pressure value of the three second flow meters 18), the system automatically adjusts the outlet gauge pressure of the pressure control component 3 to 150KPa, so that the pressure maintaining of the three cavities is realized; when the pressure is too high, the system automatically opens the second emptying valve 12 to release the pressure, so that the pressure is kept stable at 150KPa;
c. closing the fifth electric control block valve 8; and opening the second electric control block valve 5, testing for 15 minutes, and reading by the first flowmeter 17 at the moment to obtain the leakage amount of the oxidant cavity.
d. Closing the second electric control block valve 5 and opening the fifth electric control block valve 8;
(2) Coolant chamber testing
a. Closing the sixth electrically controlled block valve 9; and opening the third electrically-controlled block valve 6, testing for 15 minutes, and reading by the first flowmeter 17 at the moment to obtain the leakage amount of the coolant cavity.
b. Closing the third electric control block valve 6 and opening the sixth electric control block valve 9;
(3) Fuel cell testing
a. Closing the seventh electronically controlled block valve 10; and opening the fourth electric control block valve 7, testing for 15 minutes, and reading by the first flowmeter 17 at the moment to obtain the leakage amount of the fuel agent cavity.
c. Closing the fourth electric control block valve 7 and opening the seventh electric control block valve 10;
the test sequence of the three chambers can be adjusted as required.
2. Three-cavity air tightness test method (method for obtaining total external leakage quantity)
a. Closing the first electric control block valve 4, the fifth electric control block valve 8, the sixth electric control block valve 9 and the seventh electric control block valve 10;
b. opening a second electric control block valve 5, a third electric control block valve 6 and a fourth electric control block valve 7; testing for 60 minutes, wherein the reading of the first flowmeter 17 is the total external leakage of the three cavities;
c. closing the second electric control block valve 5, the third electric control block valve 6 and the fourth electric control block valve 7; (all the electric control block valves are closed at this time)
d. The outlet pressure of the pressure control section 3 is adjusted to 0.
The total external leakage test for the three chambers is completed at this time.
3. Three-cavity series leakage testing method
(1) Oxidant cavity series leakage testing method
a. Opening the three second evacuation valves 12; when the gauge pressure in the oxidant chamber is 50kPa, closing the second emptying valve 12 communicated with the oxidant chamber; when the gauge pressures in the coolant chamber and the fuel agent chamber are 0, the two second evacuation valves 12, which communicate the two chambers respectively, are closed;
b. automatically adjusting the outlet pressure of the pressure control part 3 to a gage pressure of 50kPa;
c. opening the second electric control block valve 5 for pressure maintaining;
d. opening a first emptying valve 11 which is correspondingly communicated with the coolant cavity and the fuel agent cavity respectively, and testing for 15 minutes, wherein the readings of two second flow meters 18 which are correspondingly communicated with the coolant cavity and the fuel agent cavity respectively are respectively the leakage value from the oxidant cavity to the fuel agent cavity and the leakage value from the oxidant cavity to the coolant cavity;
e. the reading of the first flowmeter 17 minus the readings of the two second flowmeters 18 is the leakage of the oxidizer chamber at this pressure.
(2) Coolant cavity leakage test method
a. Closing the second electrically controlled block valve 5; opening a second emptying valve 12 communicated with the oxidant cavity correspondingly;
b. until the gauge pressure values in the three cavities are 0, closing a second emptying valve 12 correspondingly communicated with the oxidant cavity and a first emptying valve 11 correspondingly communicated with the coolant cavity and the fuel agent cavity respectively;
c. opening the third electrically controlled block valve 6;
d. the system adjusts the pressure value of the outlet of the pressure control part 3 to be 0.1Mpa (or 50kPa in some cases), so as to realize the quick inflation of the coolant cavity;
e. setting the outlet pressure value of the pressure control part 3 to 50kPa when the gage pressure in the coolant chamber is 50kPa; pressure maintaining is started;
f. opening two first emptying valves 11 respectively corresponding to the oxidant cavity and the fuel cavity; testing for 15 minutes, wherein the reading values of the two second flowmeters 18 respectively corresponding to the oxidant cavity and the fuel agent cavity are respectively the cross leakage value from the coolant cavity to the oxidant cavity and the cross leakage value from the coolant cavity to the fuel agent cavity;
g. the reading of the first flow meter 17 minus the readings of the two second flow meters 18 is the leakage of the coolant chamber at this pressure.
(3) Fuel agent cavity leakage test method
a. Closing the third electrically controlled block valve 6; opening a second exhaust valve 12 communicated with the oxidant cavity correspondingly;
b. closing a second exhaust valve 12 correspondingly communicated with the coolant cavity and a first exhaust valve 11 correspondingly communicated with the oxidant cavity and the fuel agent cavity respectively until the gauge pressure in the three cavities is 0;
c. opening the fourth electronically controlled block valve 7;
d. the outlet pressure value of the system adjusting pressure control part 3 is 0.1MPa (or 50kPa in some cases), and the fuel agent cavity is rapidly inflated;
e. when the gage pressure in the fuel agent cavity is 50kPa, the outlet pressure value of the pressure control component 3 is set to 50kPa, and the pressure maintaining is started;
f. opening two first exhaust valves 11 corresponding to the oxidant chamber and the coolant chamber, respectively; testing for 15 minutes, wherein the reading values of the two second flowmeters 18 respectively corresponding to the oxidant cavity and the coolant cavity at the moment are respectively the cross leakage value from the fuel agent cavity to the coolant cavity and the cross leakage value from the fuel agent cavity to the oxidant cavity;
g. the reading of the first flow meter 17 minus the readings of the two second flow meters 19 is the leakage of the fuel agent chamber at this pressure.
h. Closing the fourth electronically controlled block valve 7; opening a second evacuation valve 12 in communication with the fuel agent chamber;
i. until the three second flow meters 18 indicate that the gauge pressure value in the three chambers is 0, closing the second purge valve 12 communicated with the fuel agent chamber and the two first purge valves 11 communicated with the oxidizer chamber and the coolant chamber, respectively;
j. the system adjusts the pressure value of the outlet of the pressure control part 3 to 0.
And ending the whole fuel cell stack airtightness test process.
In addition, in the process of testing a certain cavity leakage value or a leakage value string, when the leakage value measured by the flowmeter is larger than a certain set value (the leakage amount is very large), after the step of testing is finished, the program is directly jumped out, the next step of testing is not carried out, and the testing work is finished.
In the whole air tightness testing process, the display unit can display the leakage quantity acquired by the flowmeter in real time; and meanwhile, after the test is finished, the system can automatically compare the test value with a preset standard value, and display the final test result, the leakage value/string leakage value of the three cavities and whether the test result is qualified or not on a screen.
The technical scheme of the utility model has following advantage:
1. the one-key full-automatic fuel cell stack airtightness test is realized, and the working efficiency is greatly improved;
2. the high-precision flow sensors (namely the first flowmeter 17 and the second flowmeter 18) are adopted, so that the accuracy of the test result is improved;
3. the comprehensiveness, the high efficiency and the reliability of the test process are realized through the optimal test logic;
4. the pressure of the pressure controller and the exhaust of the electromagnetic valve (namely the second exhaust valve 12) are adopted, so that the rapid charging and discharging of the fuel cell stack can be realized;
5. the intelligent test device has the functions of data acquisition, display, storage, analysis and the like, and the intelligent level of the test device is greatly improved.
6. The whole testing process is simple and efficient, the testing content is comprehensive, and the result is accurate and reliable.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A fuel cell stack gas tightness testing device is characterized by comprising:
a source of pressurized fluid;
the air inlet pipeline assembly is communicated with the pressure fluid source through a pressure control component (3) at one end and comprises a flow testing pipeline assembly, the flow testing pipeline assembly is provided with a first flowmeter (17) and comprises a plurality of first branch pipes connected in parallel, and the fluid outlet ends of the first branch pipes can be respectively in controllable communication with a plurality of chambers of the fuel cell stack (21) in a one-to-one correspondence manner;
the plurality of emptying pipeline assemblies are respectively in one-to-one correspondence to be in controllable communication with the plurality of chambers, and each emptying pipeline assembly is connected with a second flowmeter (18) in series.
2. The fuel cell stack gas tightness test device according to claim 1,
the flow test pipeline assembly is provided with a first main pipe, the first flow meter (17) is connected onto the first main pipe in series, and a plurality of first branch pipes connected in parallel are arranged at the fluid outlet end of the first flow meter (17).
3. The fuel cell stack gas tightness test device according to claim 2,
the air inlet pipeline assembly further comprises a through pipeline assembly connected with the flow testing pipeline assembly in parallel, the through pipeline assembly is provided with a second main pipe and a plurality of second branch pipes, the second main pipe and the first main pipe are connected in parallel and are connected to the fluid outlet end of the pressure control component (3), the fluid outlet ends of the second branch pipes are respectively in one-to-one correspondence controllable communication with the plurality of chambers, and the first branch pipes and the second branch pipes communicated with the chambers are connected in parallel.
4. The fuel cell stack gas tightness test device according to claim 3,
each emptying pipeline assembly is provided with a first emptying valve (11) and a second emptying valve (12), wherein the first emptying valve (11) is located at the fluid outlet end of the second flowmeter (18), and the second emptying valve (12) is located at the fluid inlet end of the second flowmeter (18).
5. The fuel cell stack gas tightness test device according to claim 1,
the pressure fluid source comprises an air source (1) and a pressure reducing valve (2), and the pressure reducing valve (2) is located between the pressure control part (3) and the air source (1).
6. The fuel cell stack airtightness testing apparatus according to any one of claims 1 to 5,
the device comprises a device box body (22), and the air inlet pipeline assembly and the emptying pipeline assembly are integrally assembled in the device box body (22).
7. The fuel cell stack airtightness testing apparatus according to claim 6,
the device box body (22) is provided with a display unit (23), and the display unit (23) can acquire and display the flow parameters of the first flowmeter (17) and the second flowmeter (18) and the pressure parameters of the pressure control component (3).
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| CN202221429300.8U CN217822891U (en) | 2022-06-09 | 2022-06-09 | Fuel cell stack air tightness testing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117832542A (en) * | 2024-03-04 | 2024-04-05 | 河南豫氢动力有限公司 | Hydrogen flow measurement method and hydrogen supply system for stationary fuel cell power station |
| CN118067330A (en) * | 2024-04-19 | 2024-05-24 | 大连豪森瑞德设备制造有限公司 | Fuel cell airtight test system and value taking method |
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2022
- 2022-06-09 CN CN202221429300.8U patent/CN217822891U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117832542A (en) * | 2024-03-04 | 2024-04-05 | 河南豫氢动力有限公司 | Hydrogen flow measurement method and hydrogen supply system for stationary fuel cell power station |
| CN118067330A (en) * | 2024-04-19 | 2024-05-24 | 大连豪森瑞德设备制造有限公司 | Fuel cell airtight test system and value taking method |
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