Air tightness detection tool and air tightness detection device

Abstract

This application relates to an airtightness testing fixture and device, including a clamping assembly. Two sets of clamping assemblies are configured, each set including a pressure plate, a seal, and a flexible vent. One end surface of the pressure plate in a first direction is a first surface, and the pressure plate includes an air passage communicating with the outside and penetrating the first surface. The seal and the flexible vent are disposed on the first surface, with the flexible vent covering the air passage and the seal surrounding the flexible vent. The two sets of clamping assemblies are configured in a testing state for jointly clamping a workpiece along the first direction. In the testing state, the seals of both sets of clamping assemblies jointly clamp the edge of the workpiece, and the flexible vents of both sets of clamping assemblies jointly clamp the part of the workpiece being tested. This solution allows for the inspection of the proton exchange membrane's airtightness before fuel cell stack assembly, enabling early screening of proton exchange membranes with substandard airtightness, improving the pass rate of fuel cell stack airtightness testing, and enhancing fuel cell stack quality.

Description

Technical Field

[0001] This application relates to the field of flow battery manufacturing technology, and in particular to airtightness testing fixtures and airtightness testing devices. Background Technology

[0002] The fuel cell stack is the core component of a flow battery, and its performance and reliability directly determine the efficiency and lifespan of the entire energy storage system. During the manufacturing and assembly of the fuel cell stack, airtightness testing is a critical quality control step to ensure its long-term stable operation. Failure to pass the airtightness test can lead to electrolyte leakage or air entering the system, causing loss of active materials, reducing system energy efficiency, and even triggering serious problems such as component corrosion and short circuits, ultimately resulting in fuel cell failure.

[0003] As a core component of fuel cell stacks, the proton exchange membrane (PEM) lacks effective detection methods for macroscopic airtightness defects caused by localized defects such as microscopic vacuum, uneven thickness, and hidden damage. If a PEM with such localized defects is directly incorporated into the fuel cell stack assembly, these microscopic defects may be amplified under the stack's clamping forces, becoming leakage channels. This makes it difficult to accurately locate leakage currents during the final fuel cell stack airtightness test, requiring disassembly of the stack for thorough inspection, significantly increasing rework costs and time. Utility Model Content

[0004] Based on this, this application proposes an airtightness testing fixture and an airtightness testing device. The fixture is used to screen the proton exchange membrane for airtightness before the fuel cell stack is assembled, thereby improving the pass rate of the fuel cell stack airtightness test and improving the quality of the fuel cell stack.

[0005] In a first aspect, this application proposes an airtightness testing fixture for testing the airtightness of a workpiece, the workpiece including an edge portion and a portion to be tested, the edge portion being continuously disposed around the edge of the portion to be tested, and the airtightness testing fixture comprising:

[0006] The clamping assembly is configured in two sets, each set of the clamping assembly including:

[0007] A pressure plate, wherein one end surface of which is located in a first direction is a first surface, the pressure plate includes an air passage that communicates with the outside and penetrates the first surface;

[0008] A sealing element and a flexible breathable element are disposed on the first surface, the flexible breathable element covers the air passage, and the sealing element is disposed around the flexible breathable element;

[0009] The two sets of clamping assemblies are in a detection state for jointly clamping the workpiece along the first direction; in the detection state, the seals of the two sets of clamping assemblies are used to jointly clamp the edge of the workpiece, and the flexible breathable parts of the two sets of clamping assemblies are used to jointly clamp the detected part of the workpiece.

[0010] In some embodiments, the first surface is provided with a first groove and a second groove, the second groove is disposed around the first groove, the flexible breathable element is embedded in the first groove, and the sealing element is embedded in the second groove.

[0011] In some embodiments, the distance from the bottom of the first groove to the first surface is h1, and the distance from the bottom of the second groove to the first surface is h2, where h1 > h2.

[0012] In some embodiments, in the same clamping assembly, the flexible breathable element extends beyond the seal along the first direction.

[0013] In some embodiments, the flexible breathable element is a carbon felt.

[0014] In some embodiments, each of the airways includes a first flow segment and a second flow segment, the first flow segment extending along the first direction and penetrating the first surface, the second flow segment intersecting and communicating with the first flow segment, and extending along a second direction intersecting the first direction and communicating with the outside.

[0015] In some embodiments, the airtightness testing fixture further includes a quick-connect connector, and the air passage includes an external interface communicating with the outside, with the quick-connect connector installed on the external interface.

[0016] In some embodiments, each of the pressure plates is provided with a mounting portion, and the pressure plate is mounted on an external structure via the mounting portion.

[0017] In some embodiments, the airtightness testing fixture further includes a valve, a pressure testing element, and a pipeline. The valve and the pressure testing element are disposed on the pipeline. At least one external interface of the air passage is connected to the pipeline, and the pressure testing element is located between the valve and the external interface.

[0018] Secondly, this application proposes an airtightness detection device, comprising:

[0019] First mounting plate;

[0020] The second mounting plate is disposed opposite to the first mounting plate along a first direction;

[0021] A drive mechanism, connecting the first mounting plate and / or the second mounting plate, is used to drive the two plates closer to or further apart from each other along the first direction; and

[0022] As described in the first aspect, in one of the clamping components, the pressure plate is mounted on the first mounting plate, and in the other clamping component, the pressure plate is fixed to the second mounting plate.

[0023] Compared with the prior art, this application has the following beneficial effects:

[0024] The aforementioned airtightness testing fixture and device can check the airtightness of the proton exchange membrane (PEM) before fuel cell assembly, screening out non-compliant PEMs in advance, improving the pass rate of fuel cell airtightness tests, and enhancing fuel cell quality. Furthermore, the flexible venting element not only cushions and protects the workpiece but also replicates the mechanical environment of the PEM within the fuel cell, ensuring the testing conditions are highly consistent with actual applications and making the test results more instructive. Moreover, the internal ventilation channels of the flexible venting element allow the test gas to permeate evenly into every corner. Gas leaking from a small pinhole into the porous flexible venting element creates a locally high-pressure area, which is more easily detected by downstream pressure testing devices than freely diffused gas, thus improving detection sensitivity. Attached Figure Description

[0025] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0026] Figure 1 These are schematic diagrams of the workpiece structure in some embodiments;

[0027] Figure 2 This is a cross-sectional view of the airtightness testing fixture in the testing state according to some embodiments;

[0028] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0029] Figure 4 for Figure 2 Schematic diagram of the structure of the intermediate pressure block;

[0030] Figure 5 for Figure 4 Sectional view at point BB;

[0031] Figure 6 These are schematic diagrams of the seals in some embodiments;

[0032] Figure 7 These are schematic diagrams of the quick-connect connectors in some embodiments;

[0033] Figure 8 A cross-sectional view of the airtightness testing fixture in the testing state according to some other embodiments;

[0034] Figure 9This is a cross-sectional view of an airtightness testing device in testing state according to some embodiments.

[0035] The reference numerals in the detailed embodiments are as follows:

[0036] 1000. Air tightness testing device;

[0037] 100. Air tightness testing fixture; S. Workpiece; s. Proton exchange membrane; S1. Edge; s1. Heat-melting part; S2. Part to be tested; s2. Membrane body; Z. First direction; X. Second direction; 10. Clamping assembly; 11. Pressure plate; 11a. First surface; 11b. Air passage; b1. First flow section; b2. Second flow section; 11c. First groove; 11d. Second groove; 11e. External interface; 11f. Mounting part; f1. Mounting hole; 12. Seal; 13. Flexible breathable part; 14. Quick connector; 14a. External thread; 20. Valve; 30. Air pressure testing part; 40. Pipeline;

[0038] 200, First mounting plate; 300, Second mounting plate; 400, Fastener. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] In the description of this application, it should be understood that, where they appear, the terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0041] Furthermore, where applicable, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., shall be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral part; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; they may refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] It should be noted that, if an element is described as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is described as "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0045] In response to the problems mentioned in the background art, this application proposes an airtightness testing fixture, which is used to screen the proton exchange membrane for airtightness before fuel cell stack assembly, thereby improving the pass rate of fuel cell stack airtightness test and improving fuel cell stack quality.

[0046] It is worth noting that the airtightness testing fixture in this application embodiment can be adapted to workpieces that are not limited to proton exchange membranes.

[0047] In one embodiment, please refer to Figure 1The workpiece S mentioned in this embodiment includes an edge portion S1 and a detected portion S2. The edge portion S1 is continuously disposed around the edge of the detected portion S2. The detected portion S2 is a location where air leakage may occur, and the airtightness testing fixture 100 is used to detect whether the detected portion S2 leaks. The edge portion S1 is a non-leaking structure.

[0048] In practical applications, if the workpiece S is a proton exchange membrane s, the edge S1 of the workpiece S corresponds to the heat-fused part s1 of the proton exchange membrane s's edge, and the detected part S2 of the workpiece S corresponds to the membrane body s2 of the proton exchange membrane s. Whether the proton exchange membrane s leaks depends mainly on whether its membrane body s2 leaks. The proton exchange membrane s with heat-fused edges is used directly in the assembly of the fuel cell stack as an assemblable form. Its heat-fused part s1 is used to achieve heat-fused fixation of the proton exchange membrane s with other components during the fuel cell stack thermo-pressing process.

[0049] Please refer to Figure 2 and Figure 3 The airtightness testing fixture 100 in this embodiment includes a clamping assembly 10. Two sets of clamping assemblies 10 are configured, each set including a pressure plate 11, a sealing element 12, and a flexible ventilator 13. One end surface of the pressure plate 11 in the first direction Z is a first surface 11a, and the pressure plate 11 includes an air passage 11b that communicates with the outside and penetrates the first surface 11a. The sealing element 12 and the flexible ventilator 13 are disposed on the first surface 11a, with the flexible ventilator 13 covering the air passage 11b, and the sealing element 12 surrounding the flexible ventilator 13. The two sets of clamping assemblies 10 are configured in a testing state for jointly clamping a workpiece S along the first direction Z. In the testing state, the sealing elements 12 of the two sets of clamping assemblies 10 are used to jointly clamp the edge portion S1 of the workpiece S, and the flexible ventilators 13 of the two sets of clamping assemblies 10 are used to jointly clamp the tested portion S2 of the workpiece S.

[0050] In one application configuration, the first direction Z corresponds to the vertical direction. For ease of description, the pressure plates 11 of the two sets of clamping assemblies 10 are referred to as the first pressure plate and the second pressure plate, respectively. In one application configuration, the first surface 11a of the first pressure plate faces downward, and the first surface 11a of the second pressure plate faces upward, with the two opposite each other. Both the first and second pressure plates are provided with air passages 11b. One end of the air passage 11b passes through the first surface 11a of the pressure plate 11, and the other end passes through the outer surface of the pressure plate 11, thus communicating with the outside.

[0051] Each pressure plate 11 has a sealing element 12 and a flexible ventilator 13 on its first surface 11a. The sealing element 12 can be made of materials such as rubber or silicone. The flexible ventilator 13 is a compressible and breathable component, such as polyurethane foam, silicone foam, or rubber foam. The sealing element 12 and the flexible ventilator 13 can be attached to the first surface 11a by means of bonding or snap-fitting. The flexible ventilator 13 covers the air passage 11b located on the first surface 11a, meaning that the flexible ventilator 13 covers one end of the air passage 11b that extends through the first surface 11a. Because the flexible ventilator 13 is breathable, the air passage 11b and the flexible ventilator 13 are connected. The sealing element 12 is arranged around the flexible ventilator 13 to prevent air leakage from the flexible ventilator 13.

[0052] The airtightness testing device 1000 has a testing state. In the testing state, two sets of clamping assemblies 10 are arranged opposite each other along a first direction Z to jointly clamp the workpiece S. Specifically, the first surfaces 11a of the two sets of clamping assemblies 10 are arranged opposite each other, such that the seals 12 of the two sets of clamping assemblies 10 are arranged opposite each other, and the flexible venting elements 13 of the two sets of clamping assemblies 10 are arranged opposite each other. The two opposing seals 12 are used to jointly clamp the edge portion S1 of the workpiece S, and the two opposing flexible venting elements 13 are used to jointly clamp the tested portion S2 of the workpiece S.

[0053] It is worth noting that the two pressure plates 11 can be pressed against each other by an external clamping mechanism. This clamping mechanism can take many forms, such as a cylinder or hydraulic cylinder that drives the two pressure plates 11 closer together or further apart. Alternatively, the clamping mechanism can include grippers that clamp the two pressure plates 11 together.

[0054] The air passage 11b of the first pressure plate is referred to as the first air passage, and the air passage 11b of the second pressure plate is referred to as the second air passage. One method to determine whether the workpiece S leaks is to introduce test gas into the first air passage to the test pressure and observe the pressure change in the first air passage. When there is a leak in the detection part, the gas in the first air passage leaks through the detection part to the flexible vent 13, and then through the flexible vent 13 to the second air passage, causing the pressure in the first air passage to drop. If the pressure change in the first air passage is within the allowable range, it indicates that the detection part does not leak and the workpiece S has good airtightness.

[0055] Another method to determine whether workpiece S is leaking is to fill the first air passage with test gas to the test pressure and observe the pressure change in the second air passage. If the pressure in the second air passage changes, it indicates that the gas in the first air passage leaks into the second air passage through the detection unit and the flexible breathable part 13, and the workpiece S has poor air tightness. Conversely, if the pressure in the second air passage does not change, the detection unit does not leak, and the workpiece S has good air tightness.

[0056] Another method to determine whether workpiece S is leaking is to simultaneously fill the first and second air passages with test gas and maintain pressure. If the air pressure in the second and first air passages changes, it indicates that the detection part is leaking and workpiece S has poor airtightness. Conversely, workpiece S has good airtightness.

[0057] When using the aforementioned airtightness testing fixture 100 to test the airtightness of the proton exchange membrane s, the membrane body s2 of the proton exchange membrane s is clamped between the flexible permeable parts 13 of the two sets of clamping components 10, and the heat-sealed part s1 of the proton exchange membrane s is clamped between the sealing parts 12 of the two sets of clamping components 10. After filling any air passage 11b with test gas to the test pressure, the change in air pressure in air passage 11b is observed. If the air pressure in air passage 11b changes, it indicates that the membrane body s2 is leaking air, and the proton exchange membrane s has poor airtightness. If the air pressure in air passage 11b does not change, it indicates that the membrane body s2 is not leaking air, and the proton exchange membrane s has good airtightness.

[0058] In this way, the airtightness of the proton exchange membrane (PEM) can be checked before the fuel cell stack is assembled, and proton exchange membranes that fail the airtightness test can be screened out in advance, thereby improving the pass rate of the fuel cell stack airtightness test and improving the quality of the fuel cell stack.

[0059] Furthermore, by setting up the flexible venting element 13, when the pressing assembly 10 clamps the proton exchange membrane s, the flexible venting element 13 deforms under pressure and fits perfectly against the surface of the membrane body s2. This allows the concentrated force applied to the pressure plate 11 to be converted into a uniformly distributed surface pressure through the flexible venting element 13. On the one hand, this can buffer and protect the membrane body s2. On the other hand, in the fuel cell stack product, the proton exchange membrane s is uniformly pressed by the elastic carbon felt on both sides. By using the flexible venting element 13 to press it on both sides of the membrane body s2, this mechanical environment is perfectly reproduced, making the testing conditions highly consistent with actual applications and the testing results more instructive.

[0060] Furthermore, the air channels inside the flexible air-permeable component 13 allow the test gas to permeate evenly into every corner of the flexible air-permeable component 13, thereby reaching any potential defect point (such as pinholes or cracks) on the surface of the membrane body s2. When gas leaks from a small pinhole into the loose flexible air-permeable component 13, it will form a high-concentration gas pressure area in a local area. This is more easily detected by the downstream gas pressure detection component 30 than freely diffused gas, thus improving the detection sensitivity.

[0061] In some embodiments, refer to Figure 4 and Figure 5 The first surface 11a is provided with a first groove 11c and a second groove 11d. The second groove 11d is arranged around the first groove 11c. The flexible breathable element 13 is embedded in the first groove 11c, and the sealing element 12 is embedded in the second groove 11d.

[0062] The second groove 11d is generally annular (circular or square, etc.), and a portion of the seal 12 is embedded within the second groove 11d. Generally, the shapes of the seal 12 and the second groove 11d are adapted to the shape of the edge S1 of the workpiece S. The shapes and sizes of the first groove 11c and the flexible breathable element 13 are adapted to the membrane body s2 of the workpiece S. In one embodiment, combined with Figure 6 Understand that the workpiece S is a proton membrane s, which is square in shape. The second groove 11d and the sealing element 12 are both square annular structures, and the first groove 11c and the flexible breathable element 13 are both square in shape.

[0063] At this time, the first groove 11c and the second groove 11d are used to install the seal 12 and the flexible ventilator 13 respectively, which not only makes the installation simple, but also makes it convenient to replace the seal 12 and the flexible ventilator 13.

[0064] Further in the embodiments, refer to Figure 5 The distance from the bottom of the first groove 11c to the first surface 11a is h1, and the distance from the bottom of the second groove 11d to the first surface 11a is h2, where h1 > h2.

[0065] The distance from the bottom of each groove to the first surface 11a is called the groove depth. h1 is the groove depth of the first groove 11c, and h2 is the groove depth of the second groove 11d. The groove depth of the first groove 11c is greater than that of the second groove 11d, mainly because the flexible breathable component 13 has relatively low strength and density. Placing it in the first groove 11c with the increased groove depth makes the installation of the flexible breathable component 13 more stable.

[0066] In some embodiments, refer to Figure 3 In the same clamping assembly 10, the flexible venting element 13 extends beyond the sealing element 12 along the first direction Z. In the actual product, the thickness of the heat-fused portion s1 at the edge of the proton exchange membrane s exceeds that of the membrane body s2 in the middle. The flexible venting element 13 extends beyond the sealing element 12, supplementing the thickness of the membrane body s2 and effectively adhering to it. At the same time, the side of the portion of the flexible venting element 13 extending beyond the sealing element 12 adheres to the heat-fused portion s1 of the proton exchange membrane s, preventing gas leakage from the side of the flexible venting element 13 through the heat-fused portion s1.

[0067] In some embodiments, the flexible venting element 13 is carbon felt. Carbon felt has good air permeability and is compressible. In the fuel cell stack product, carbon felt is provided on both sides of the proton exchange membrane s. In this case, using carbon felt as the flexible venting element 13 can not only achieve air permeability and compressibility, but also effectively restore the assembly state of the proton exchange membrane s in the fuel cell stack product, making the testing environment closer to the real situation and the test results more reliable.

[0068] In some embodiments, refer to Figure 2 and Figure 5 Each airway 11b includes a first flow section b1 and a second flow section b2. The first flow section b1 extends along a first direction Z and penetrates the first surface 11a. The second flow section b2 intersects and connects with the first flow section b1, and extends along a second direction X that intersects the first direction Z and connects to the outside.

[0069] The first flow section b1 and the second flow section b2 are connected to form the air passage 11b. The pressure plate 11 is generally designed as a thin plate to reduce material consumption and lower costs. In one application, the first flow section b1 extends vertically and the second flow section b2 extends horizontally. In actual applications, the pressure plate 11 is pressed against the workpiece S by the downward pressure provided by the external structure. The external interface 11e of the air passage 11b is located on the horizontal side of the pressure plate 11 through the second flow section b2, which makes it easier to connect the pipeline 40 to the external interface 11e of the air passage 11b. This allows the air passage 11b to be connected to the air supply source through the pipeline 40, reducing interference between the pipeline 40 and the external structure, and making the pipeline 40 layout more reasonable.

[0070] In some embodiments, refer to Figure 2 and Figure 7 The air tightness testing fixture 100 also includes a quick-connect connector 14, and the air passage 11b includes an external interface 11e that communicates with the outside. The quick-connect connector 14 is installed on the external interface 11e.

[0071] The quick-connect coupling 14 is a tool-free connector that allows for rapid connection and disconnection of the pipeline 40, and is widely used in pneumatic, hydraulic, and fluid transport systems. Its core design principle is "plug and connect, pull and disconnect." In this embodiment, the quick-connect coupling 14 is used to enable rapid insertion and removal of the pipeline 40, connecting the air passage 11b to the air supply source via the pipeline 40, greatly simplifying the airtightness testing process.

[0072] The specific selection of the quick-connect connector 14 is not limited in this embodiment, and commercially available products can be used. Specifically, it can be combined with… Figure 5 and Figure 7 It is understood that the external interface 11e of the airway 11b is provided with an internal thread, and the quick-connect fitting 14 is provided with an external thread 14a. The quick-connect fitting 14 is installed on the airway 11b by the mating of the internal thread and the external thread 14a.

[0073] In one embodiment, reference is made to... Figure 2 The external interface 11e of the air passage 11b of each pressure plate 11 is located on the same side in the second direction X, which facilitates the connection of the pipeline 40.

[0074] In some embodiments, refer to Figure 2Each pressure plate 11 is provided with a mounting part 11f, and the pressure plate 11 is mounted to the external structure via the mounting part 11f. In actual application, the pressure plate 11 is mounted on the external drive mechanism, and the drive mechanism drives the two pressure plates 11 to press against each other, so as to press the workpiece S between the pressure plates 11.

[0075] Specifically, the mounting part 11f can be a mounting hole f1, and a fastener 400, such as a bolt, connects the mounting hole f1 and the drive mechanism to realize the installation of the pressure plate 11 on the drive mechanism. This method has a simple structure and is easy to implement. Of course, the mounting part 11f can also be a magnetic component or other forms of structure, as long as it can realize the connection between the pressure plate 11 and the drive mechanism.

[0076] In some embodiments, refer to Figure 8 The air tightness testing fixture 100 also includes a valve 20, a pressure testing element 30, and a pipeline 40. The valve 20 and the pressure testing element 30 are located in the pipeline 40. At least one external interface 11e of the air passage 11b is connected to the pipeline 40. The pressure testing element 30 is located between the valve 20 and the external interface 11e.

[0077] The air pressure detection component 30 can be a pressure gauge, pressure sensor, etc., used to detect the air pressure in the pipeline 40. The valve 20 is used to control the opening and closing of the pipeline 40, and can be an electric valve, manual valve, etc.

[0078] In practical applications, after pipeline 40 connects air passage 11b to the air supply source, valve 20 is opened to inflate air passage 11b of pressure plate 11. When the pressure detection value of pressure sensor 30 reaches the test pressure, valve 20 is closed. Then, pressure sensor 30 is used to detect whether the pressure in pipeline 40 changes. If the pressure changes, it indicates that the proton exchange membrane s2 is leaking. Otherwise, there is no leak.

[0079] In other embodiments, the air pressure detection element 30 may be directly disposed within the airway 11b.

[0080] In one specific embodiment of this application, the airtightness testing fixture 100 includes two sets of clamping assemblies 10. Each set of clamping assemblies 10 includes a pressure plate 11, a sealing element 12, and a flexible air-permeable element 13. The first surface 11a of the pressure plate 11 is provided with a first groove 11c and a second groove 11d. The second groove 11d is arranged around the first groove 11c. The sealing element 12 is embedded in the second groove 11d, and the flexible air-permeable element 13 is embedded in the first groove 11c. The pressure plate 11 includes an air passage 11b. One end of the air passage 11b passes through the first surface 11a and is covered by the flexible air-permeable element 13.

[0081] In the detection state, the first surfaces 11a of the two sets of clamping assemblies 10 are arranged opposite each other, the seals 12 of the two sets of clamping assemblies 10 are arranged opposite each other, and the flexible ventilators 13 of the two sets of clamping assemblies 10 are arranged opposite each other. The two oppositely arranged seals 12 are used together to clamp the edge portion S1 of the workpiece S, and the two oppositely arranged flexible ventilators 13 are used together to clamp the detected portion S2 of the workpiece S.

[0082] Additionally, refer to Figure 9 This application also provides an airtightness testing device 1000, including a first mounting plate 200, a second mounting plate 300, a driving mechanism (not shown), and the airtightness testing fixture 100 in any of the above embodiments. The second mounting plate 300 and the first mounting plate 200 are disposed opposite to each other along a first direction Z. The driving mechanism is connected to the first mounting plate 200 and / or the second mounting plate 300, and is used to drive the two to move closer or further apart along the first direction Z. The pressure plate 11 of one of the pressing components 10 is mounted on the first mounting plate 200, and the pressure plate 11 of the other pressing component 10 is fixed to the second mounting plate 300.

[0083] The driving mechanism can be a cylinder, hydraulic cylinder, etc. In one embodiment, the second mounting plate 300 is arranged below the first mounting plate 200, and the first mounting plate 200 is connected to the driving mechanism and moves up and down along the first direction Z under the drive of the driving mechanism. Each pressure plate 11 is mounted on the first mounting plate 200 or the second mounting plate 300 through the mounting part 11f. In one embodiment, one of the pressure plates 11 is provided with a mounting hole f1, and the first mounting plate 200 is provided with a through hole (not shown). The through hole and the mounting hole f1 are coaxially arranged, and the fastener 400 is threadedly connected to both the through hole and the mounting hole f1, so that the pressure plate 11 is mounted on the first mounting plate 200. Similarly, another pressure plate 11 is provided with a mounting hole f1, and the second mounting plate 300 is provided with a through hole. The through hole and the mounting hole f1 are coaxially arranged, and the fastener 400 is threadedly connected to both the through hole and the mounting hole f1, so that the pressure plate 11 is mounted on the second mounting plate 300.

[0084] During actual testing, the drive mechanism drives the first mounting plate 200 and the second mounting plate 300 to move closer to each other, which in turn causes the two pressure plates 11 to move closer to each other, thereby pressing the workpiece S between the sealing element 12 and the flexible breathable element 13 between the two pressure plates 11.

[0085] The airtightness detection device 1000 can be used, but is not limited to, to detect the airtightness of the proton exchange membrane s, and includes all the beneficial effects described in the above embodiments, which will not be repeated here.

[0086] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A hermeticity inspection tool (100) for hermeticity inspection of a workpiece (S), the workpiece (S) comprising an edge portion (SI) and a portion to be inspected (S2), the edge portion (SI) being continuously provided around an edge of the portion to be inspected (S2), characterized in that, The airtightness testing fixture (100) includes: The clamping assembly (10) is configured in two sets, each set of the clamping assembly (10) including: The pressure plate (11) has a first surface (11a) at one end located in the first direction (Z), and the pressure plate (11) includes an air passage (11b) that communicates with the outside and penetrates the first surface (11a); A sealing element (12) and a flexible breathable element (13) are disposed on the first surface (11a), the flexible breathable element (13) covers the air passage (11b), and the sealing element (12) is disposed around the flexible breathable element (13); Among them, the two sets of clamping assemblies (10) have a detection state for jointly clamping the workpiece (S) along the first direction (Z); in the detection state, the seals (12) of the two sets of clamping assemblies (10) are used to jointly clamp the edge portion (S1) of the workpiece (S), and the flexible breathable members (13) of the two sets of clamping assemblies (10) are used to jointly clamp the detected portion (S2) of the workpiece (S).

2. The air tightness detection tool (100) according to claim 1, characterized in that, The first surface (11a) is provided with a first groove (11c) and a second groove (11d), the second groove (11d) is provided around the first groove (11c), the flexible breathable member (13) is embedded in the first groove (11c), and the sealing member (12) is embedded in the second groove (11d).

3. The airtightness testing fixture (100) according to claim 2, characterized in that, The distance from the bottom of the first groove (11c) to the first surface (11a) is h1, and the distance from the bottom of the second groove (11d) to the first surface (11a) is h2, where h1 > h2.

4. The airtightness testing fixture (100) according to claim 1, characterized in that, In the same clamping assembly (10), the flexible breathable element (13) is disposed beyond the seal (12) along the first direction (Z).

5. The airtightness testing fixture (100) according to claim 1, characterized in that, The flexible breathable component (13) is a carbon felt.

6. The airtightness testing fixture (100) according to claim 1, characterized in that, Each of the air passages (11b) includes a first flow segment (b1) and a second flow segment (b2), the first flow segment (b1) extending along the first direction (Z) and penetrating the first surface (11a), the second flow segment (b2) intersecting and communicating with the first flow segment (b1), and extending along a second direction (X) intersecting the first direction (Z) and communicating with the outside.

7. The airtightness testing fixture (100) according to claim 1, characterized in that, The air tightness testing fixture (100) also includes a quick-connect connector (14), and the air passage (11b) includes an external interface (11e) that communicates with the outside. The quick-connect connector (14) is installed on the external interface (11e).

8. The airtightness testing fixture (100) according to claim 1, characterized in that, Each of the pressure plates (11) is provided with a mounting part (11f), and the pressure plate (11) is mounted on the external structure via the mounting part (11f).

9. The airtightness testing fixture (100) according to claim 1, characterized in that, The air tightness testing fixture (100) further includes a valve (20), a pressure testing element (30), and a pipeline (40). The valve (20) and the pressure testing element (30) are located in the pipeline (40). At least one external interface (11e) of the air passage (11b) is connected to the pipeline (40). The pressure testing element (30) is located between the valve (20) and the external interface (11e).

10. An airtightness testing device (1000), characterized in that, include: First mounting plate (200); The second mounting plate (300) is disposed opposite to the first mounting plate (200) along the first direction (Z); A drive mechanism, connected to the first mounting plate (200) and / or the second mounting plate (300), is used to drive the two to move closer or further apart from each other along the first direction (Z); and The airtightness testing fixture (100) according to any one of claims 1 to 9, wherein the pressure plate (11) of one of the clamping components (10) is mounted on the first mounting plate (200), and the pressure plate (11) of the other clamping component (10) is fixed to the second mounting plate (300).

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