Air tightness testing device

Abstract

The utility model discloses an air tightness testing device, which relates to the field of detection equipment and comprises a first die holder and a second die holder, the second die holder and the first die holder are connected and jointly define an installation space, and a gas channel is arranged in the first die holder; the test assembly comprises a first test piece and a second test piece, the first test piece and the second test piece are suitable for being bonded through an adhesive film and are suitable for defining a test space together with the adhesive film, and at least part of the pressing seat is arranged in the mounting space and presses the test assembly; the gas supply pipeline is suitable for being connected with a gas source, the testing assembly is provided with a communication hole communicated with the testing space, the gas channel is communicated between the communication hole and the gas supply pipeline, and the flow meter is arranged on the gas supply pipeline. Therefore, by introducing the gas with the preset pressure into the test space, the gas tightness of the adhesive film can be evaluated through the flow meter, so that the adhesive film can be selected according to the gas tightness of different adhesive films, and the model selection difficulty of the adhesive film can be reduced.

Description

Technical Field

[0001] The utility model relates to the field of detection equipment, in particular to an airtightness testing device. Background Art

[0002] In the related art, a fuel cell includes a single cell, and the single cell includes a bipolar plate and a membrane electrode, wherein the adhesive film plays a bonding and sealing role in the single cell to reduce gas leakage. However, the airtightness of the adhesive film is difficult to measure, which makes it difficult to select the adhesive film. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide an airtightness test device, which can quickly evaluate the airtightness of the adhesive film, which is conducive to reducing the difficulty of selecting the adhesive film.

[0004] According to the utility model, the airtightness testing device is used to test the airtightness of the fuel cell film, and the airtightness testing device includes: a first mold base and a second mold base, the second mold base is connected to the first mold base and jointly defines an installation space, and a gas channel is opened in the first mold base; a test assembly and a pressure seat, the test assembly includes a first test piece and a second test piece, the first test piece and the second test piece are suitable for being bonded by the film and are suitable for jointly defining a test space with the film, at least a part of the test assembly is arranged in the installation space, at least a part of the pressure seat is arranged in the installation space and presses the test assembly; a gas supply pipeline and a flow meter, the gas supply pipeline is suitable for being connected to a gas source, the test assembly has a connecting hole connected to the test space, the gas channel is connected between the connecting hole and the gas supply pipeline, and the flow meter is arranged on the gas supply pipeline.

[0005] According to the air tightness testing device of the utility model, by allowing the first test piece, the second test piece and the film to define a test space, and introducing gas of preset pressure into the test space, the air tightness of the film can be evaluated through a flow meter, so that the film can be selected according to the air tightness of different films, which is conducive to reducing the difficulty of selecting the film.

[0006] In some examples of the present invention, the first mold base and the second mold base are detachably connected, the installation space penetrates the second mold base along the thickness direction of the second mold base, and the second test piece is clamped between the first mold base and the second mold base.

[0007] In some examples of the present invention, a side of the first mold base facing the second mold base has a plurality of limiting members, and the plurality of limiting members are disposed around the outside of the test component and are used to limit the test component.

[0008] In some examples of the present invention, the plurality of limit members all have a guide surface, and from the second mold base to the first mold base, the guide surface gradually approaches the center position of the first mold base.

[0009] In some examples of the present invention, the second mold base has a plurality of first matching holes, and the plurality of limiting members are respectively located in the plurality of first matching holes.

[0010] In some examples of the present invention, the first mold base has a plurality of first positioning portions, the second mold base has a plurality of second positioning portions, and the plurality of first positioning portions are positioned and matched with the plurality of second positioning portions.

[0011] In some examples of the present invention, one of the first positioning portion and the second positioning portion is configured as a positioning column, and the other of the first positioning portion and the second positioning portion is configured as a positioning hole.

[0012] In some examples of the present invention, the air tightness testing device further includes: a control valve, which is arranged on the gas supply pipeline.

[0013] In some examples of the present invention, the air tightness testing device further includes: a press, which is located on a side of the press seat away from the first mold seat and is opposite to and spaced apart from the press seat.

[0014] In some examples of the present invention, the air tightness testing device further includes: a sealing member, wherein the sealing member is clamped between the second testing member and the first mold base.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 It is a schematic diagram of the air tightness test device according to an embodiment of the utility model (the first mold base, the second mold base, the test assembly, and the pressure base are cross-sectional views);

[0018] Figure 2 is a perspective schematic diagram of a test assembly and an adhesive film according to an embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the assembly of the first mold base and the test assembly according to an embodiment of the utility model;

[0020] Figure 4 It is an assembly diagram of the first die base, the second die base, and the pressure base according to an embodiment of the utility model.

[0021] Reference numerals:

[0022] Air tightness testing device 100;

[0023] The first die base 1; the stopper 11; the guide surface 111; the first positioning portion 12; the mounting hole 13;

[0024] Second mold base 2; first matching hole 21; second positioning portion 22; installation space 3;

[0025] Test assembly 4; first test piece 41; second test piece 42; test space 43; communication hole 44;

[0026] Adhesive film 5; Press seat 6;

[0027] Gas supply pipeline 7; gas channel 71; gas source 72;

[0028] Flow meter 8; control valve 9; seal 10. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] Reference below Figure 1-Figure 4 The air tightness testing device 100 according to the embodiment of the utility model is described. The air tightness testing device 100 is used to test the air tightness of the fuel cell adhesive membrane 5 .

[0031] like Figure 1-Figure 4 As shown, the air tightness testing device 100 according to the embodiment of the utility model includes: a first mold base 1, a second mold base 2, a testing assembly 4, a pressure base 6, a gas supply pipeline 7 and a flow meter 8.

[0032] The second mold base 2 is connected to the first mold base 1 and jointly defines the installation space 3. A gas channel 71 is opened in the first mold base 1; the test assembly 4 includes a first test piece 41 and a second test piece 42. The first test piece 41 and the second test piece 42 are suitable for being bonded by the adhesive film 5 and are suitable for jointly defining a test space 43 with the adhesive film 5. At least a part of the test assembly 4 is arranged in the installation space 3, and at least a part of the pressure seat 6 is arranged in the installation space 3 and presses the test assembly 4; the gas supply pipeline 7 is suitable for being connected to the gas source 72, and the test assembly 4 has a connecting hole 44 connected to the test space 43. The gas channel 71 is connected between the connecting hole 44 and the gas supply pipeline 7, and the flow meter 8 is arranged on the gas supply pipeline 7.

[0033] Among them, the second mold base 2 is connected to the first mold base 1, and the second mold base 2 and the first mold base 1 jointly define an installation space 3. As some embodiments of the present application, the second mold base 2 can be detachably connected to the first mold base 1 by bolt connection, and a gas channel 71 is opened in the first mold base 1.

[0034] The test assembly 4 includes a first test piece 41 and a second test piece 42, and the first test piece 41 and the second test piece 42 can be bonded by the adhesive film 5, and the first test piece 41 and the second test piece 42 and the adhesive film 5 together define a test space 43. It can be understood that the first test piece 41 and the second test piece 42 are bonded by the adhesive film 5 to simulate the use scenario of the adhesive film 5 in a fuel cell cell. As some embodiments of the present application, the adhesive film 5 can be bonded between the electrode plate and the membrane frame.

[0035] The test component 4 is at least partially disposed in the installation space 3, that is, the entire structure of the test component 4 is disposed in the installation space 3, or, part of the structure of the test component 4 is disposed in the installation space 3. As some embodiments of the present application, part of the test component 4 is disposed in the installation space 3, and the second test piece 42 is clamped between the first mold base 1 and the second mold base 2.

[0036] At least part of the pressure seat 6 is arranged in the installation space 3, that is, the pressure seat 6 can be partially arranged in the installation space 3, or the pressure seat 6 can be completely arranged in the installation space 3, and the pressure seat 6 can press the test component 4. It can be understood that during the test, it is necessary to introduce a gas with a high pressure into the test space 43. By setting the pressure seat 6, the test component 4 can be pressed, simulating the stress state of the test component 4 in the single cell, which is conducive to improving the accuracy of the test.

[0037] The gas supply pipeline 7 is connected to the gas source 72. As some embodiments of the present application, the gas supply pipeline 7 has two opposite ends, one end of which is connected to the gas channel 71, and the other end is connected to the gas source 72. The test component 4 has a connecting hole 44 connected to the test space 43. The gas channel 71 is connected between the connecting hole 44 and the gas supply pipeline 7 so that the gas provided by the gas source 72 can pass into the test space 43. The flow meter 8 is arranged on the gas supply pipeline 7. As some embodiments of the present application, the flow meter 8 is connected to a computer, and the flow change and the air tightness of the film 5 can be directly obtained by the computer.

[0038] It is understandable that by replacing different adhesive films 5, the air tightness of different adhesive films 5 can be evaluated, so that the adhesive films 5 can be selected according to the air tightness of different adhesive films 5. As some embodiments of the present application, adhesive films 5 of different materials, adhesive films 5 of different bonding widths, adhesive films 5 of different hot pressing processes, and adhesive films 5 of different hot pressing parameters can be tested to select a suitable adhesive film 5.

[0039] Therefore, by allowing the first test piece 41, the second test piece 42 and the film 5 to define a test space 43, and introducing gas of a preset pressure into the test space 43, the air tightness of the film 5 can be evaluated through the flow meter 8, so that the film 5 can be selected according to the air tightness of different films 5, which is conducive to reducing the difficulty of selecting the film 5.

[0040] In some embodiments of the present invention, Figure 1 , Figure 3 and Figure 4 As shown, the first mold base 1 and the second mold base 2 are detachably connected, and the installation space 3 is along the thickness direction of the second mold base 2 (i.e. Figure 1 The X direction as shown in the figure) passes through the second mold base 2, and the second test piece 42 is clamped between the first mold base 1 and the second mold base 2.

[0041] The first mold base 1 and the second mold base 2 are detachably connected, and the connection method of the first mold base 1 and the second mold base 2 can be, but is not limited to, bolt connection, clamping, etc. As some embodiments of the present application, the first mold base 1 and the second mold base 2 are connected by bolt connection, such as Figure 3 As shown, the first die base 1 and the second die base 2 are both provided with a plurality of mounting holes 13, and the plurality of mounting holes 13 of the first die base and the plurality of mounting holes 13 of the second die base 2 are arranged one by one, and bolts can be sequentially passed through the mounting holes 13 of the first die base and the mounting holes 13 of the second die base 2 to bolt the first die base 1 and the second die base 2. As some embodiments of the present application, the first die base 1 and the second die base 2 are both provided with six mounting holes 13, and the six mounting holes 13 can be arranged circumferentially.

[0042] The installation space 3 is along the thickness direction of the second mold base 2 (i.e. Figure 1 The second test piece 42 is sandwiched between the first mold base 1 and the second mold base 2.

[0043] It is understandable that at least part of the structure of the press seat 6 can be located in the installation space 3, by making the installation space 3 along the thickness direction of the second mold base 2 (i.e. Figure 1 The second mold base 2 is penetrated by the second test piece 42 (in the X direction shown in the figure), which can facilitate the installation of the test component 4 and the pressure base 6, and the second test piece 42 is clamped between the first mold base 1 and the second mold base 2, so that the installation firmness of the test component 4 can be improved.

[0044] In some embodiments of the present invention, Figure 3 As shown, a side of the first mold base 1 facing the second mold base 2 has a plurality of limiting members 11 , and the plurality of limiting members 11 are disposed around the outside of the test assembly 4 and are used to limit the test assembly 4 .

[0045] Among them, the first mold base 1 has a plurality of limit members 11 on the side facing the second mold base 2, and the number of the limit members 11 can be but not limited to three, four, five, etc. As some embodiments of the present application, the number of the limit members 11 is three. The plurality of limit members 11 are arranged around the outside of the test component 4, and the plurality of limit members 11 are all used to limit the test component 4. As some embodiments of the present application, the plurality of limit members 11 can be arranged circumferentially around the central axis of the first mold base 1, and the central axis of the test component 4 is colinear with the central axis of the first mold base 1. When the test component 4 is placed on the first mold base 1, the plurality of limit members 11 can be arranged around the outside of the test component 4 to limit the test component 4.

[0046] By providing a plurality of limiting members 11 on the side of the first mold base 1 facing the second mold base 2, the test component 4 can be limited to improve the installation firmness of the test component 4, and the installation position of the test component 4 can be easily determined to reduce the probability of deviation of the installation position of the test component 4.

[0047] In some embodiments of the present invention, Figure 3 As shown, the plurality of limit members 11 all have a guide surface 111 , and from the second mold base 2 to the first mold base 1 , the guide surface 111 gradually approaches the center position of the first mold base 1 .

[0048] The plurality of stoppers 11 all have guide surfaces 111, and the guide surfaces 111 may be, but are not limited to, inclined surfaces, curved surfaces, etc. Figure 1 In the X direction shown in the figure), and from the second mold base 2 to the first mold base 1, the guide surface 111 gradually approaches the center position of the first mold base 1 (that is, the guide surface 111 gradually approaches the central axis of the first mold base 1). In other words, the guide surface 111 is along the thickness direction of the second mold base 2 (that is, Figure 1 The mold base 1 has two opposite ends (in the X direction shown in the figure), one end of which is close to the first mold base 1 and the other end is far away from the first mold base 1, and the end close to the first mold base 1 is closer to the center position of the first mold base 1.

[0049] By making the multiple limit members 11 have guide surfaces 111, even if the placement position of the test component 4 is not accurate, under the action of the guide surfaces 111, the test component 4 can accurately slide to the installation position, thereby facilitating the installation of the test component 4 on the first mold base 1, which is beneficial to reducing the difficulty of using the airtightness testing device 100 and improving the testing efficiency.

[0050] In some embodiments of the present invention, Figure 4 As shown, the second mold base 2 has a plurality of first matching holes 21 , and the plurality of limiting members 11 are respectively located in the plurality of first matching holes 21 .

[0051] The second mold base 2 has a first matching hole 21, the number of the first matching holes 21 can be multiple, the number of the first matching holes 21 is the same as the number of the limiting members 11 and is arranged one-to-one, and the number of the first matching holes 21 can be but not limited to three, four, five, etc. As some embodiments of the present application, the number of the first matching holes 21 is three, and the number of the plurality of limiting members 11 is three. The plurality of limiting members 11 are respectively located in the plurality of first matching holes 21.

[0052] By providing the second mold base 2 with a plurality of first matching holes 21, a plurality of limit members 11 can be avoided so that the first mold base 1 and the second mold base 2 can be pressed together. In addition, the plurality of limit members 11 and the first matching holes 21 can also play a positioning role so that the relative positions of the first mold base 1 and the second mold base 2 are accurate.

[0053] In some embodiments of the present invention, Figure 3 As shown, the first mold base 1 has a plurality of first positioning portions 12 , and the second mold base 2 has a plurality of second positioning portions 22 , and the plurality of first positioning portions 12 are positioned and matched with the plurality of second positioning portions 22 .

[0054] The first mold base has a first positioning portion 12, and the number of the first positioning portions 12 is multiple, and the number of the first positioning portions 12 can be but not limited to two, three, four, etc. As some embodiments of the present application, the number of the first positioning portions 12 is two. The second mold base 2 has a plurality of second positioning portions 22, and the number of the second positioning portions 22 is multiple, and the number of the second positioning portions 22 can be but not limited to two, three, four, etc. As some embodiments of the present application, the number of the second positioning portions 22 is two. The plurality of first positioning portions 12 and the plurality of second positioning portions 22 can be positioned and matched.

[0055] By positioning and matching the multiple first positioning parts 12 with the multiple second positioning parts 22, it is easy to determine the relative positions of the first mold base 1 and the second mold base 2, thereby reducing the difficulty of assembling the first mold base 1 and the second mold base 2, and improving the assembly efficiency of the first mold base 1 and the second mold base 2, which is beneficial to improving the testing efficiency of the airtightness testing device 100.

[0056] In some embodiments of the present invention, one of the first positioning portion 12 and the second positioning portion 22 is configured as a positioning column, and the other of the first positioning portion 12 and the second positioning portion 22 is configured as a positioning hole.

[0057] Among them, one of the first positioning portion 12 and the second positioning portion 22 is configured as a positioning column, and the other of the first positioning portion 12 and the second positioning portion 22 is configured as a positioning hole. The coordination between the positioning hole and the positioning column can reduce the difficulty of assembling the first mold base 1 and the second mold base 2. As some embodiments of the present application, the first positioning portion 12 is configured as a positioning column, and the second positioning portion 22 is configured as a positioning hole. As some embodiments of the present application, the first positioning portion 12 is configured as a positioning hole, and the second positioning portion 22 is configured as a positioning column.

[0058] By making one of the first positioning portion 12 and the second positioning portion 22 into a positioning column and the other of the first positioning portion 12 and the second positioning portion 22 into a positioning hole, the difficulty of processing the first positioning portion 12 and the second positioning portion 22 can be reduced, and the matching form of the positioning column and the positioning hole is reliable, thereby effectively improving the positioning effect.

[0059] In some embodiments of the present invention, Figure 1 As shown, the air tightness testing device 100 further includes: a control valve 9 , which is arranged on the gas supply pipeline 7 .

[0060] Among them, the control valve 9 is arranged on the gas supply pipeline 7, and the control valve 9 has two states of opening and closing. When the control valve 9 is opened, the gas source 72 is connected with the gas channel 71, and the gas source 72 can provide gas of preset pressure to the test space 43. When the control valve 9 is disconnected, the gas source 72 is disconnected from the gas channel 71, and the gas source 72 cannot provide gas of preset pressure to the test space 43. As some embodiments of the present application, the gas pressure entering the gas channel 71 can be adjusted by adjusting the control valve 9.

[0061] By arranging the control valve 9 on the gas supply pipeline 7, it is possible to easily adjust the pressure of the incoming gas so that the airtightness testing device 100 can simulate a variety of gas pressure conditions. Moreover, when the airtightness testing device 100 is not in use, the control valve 9 can be closed to reduce the probability of gas leakage, thereby helping to improve the reliability of the airtightness testing device 100.

[0062] In some embodiments of the present invention, the air tightness testing device 100 further includes: a press, which is located on a side of the press seat 6 away from the first mold seat 1 and is opposite to and spaced from the press seat 6 .

[0063] Among them, the air tightness test device 100 also includes a press, which is arranged on the side of the pressure seat 6 away from the first mold base 1, and the pressure seat 6 is arranged opposite to the press and has a certain interval. It can be understood that during the test process, it is necessary to introduce high-pressure gas into the test space 43. Due to the high gas pressure, the gas may disperse the test component 4 and open the pressure seat 6. The opening of the pressure seat 6 may damage other surrounding components and may also cause harm to the tester. By setting a press and making the press opposite to the pressure seat 6 and having a certain interval, when the pressure seat 6 is opened by the gas, the press can block the pressure seat 6 to reduce the probability of damage to other surrounding components and harm to the tester, so as to improve the safety of the air tightness test device 100.

[0064] In some embodiments of the present invention, Figure 3 As shown, the air tightness testing device 100 further includes: a sealing member 10 , which is sandwiched between the second testing member 42 and the first mold base 1 .

[0065] The air tightness testing device 100 further includes a sealing member 10 , which is sandwiched between the second testing member 42 and the first mold base 1 . As some embodiments of the present application, the sealing member 10 may be constructed as an O-ring.

[0066] As some embodiments of the present application, the first mold base 1 has a sealing ring groove, and the seal 10 is partially arranged in the sealing ring groove of the first mold base 1. This can improve the installation firmness of the seal 10 and reduce the probability of movement of the seal 10. Moreover, when the test assembly 4 is placed on the first mold base 1, the seal 10 can be clamped between the second test piece 42 of the test assembly 4 and the first mold base 1.

[0067] By making the airtightness testing device 100 further include a seal 10 and sandwiching the seal 10 between the second testing piece 42 and the first mold base 1 , the airtightness testing device 100 can have good sealing performance, thereby facilitating improving the accuracy of the airtightness test of the adhesive film 5 .

[0068] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0069] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0070] In the description of the present invention, "plurality" means two or more.

[0071] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0072] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0073] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0074] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An airtightness testing device (100), characterized in that: Used to test the air tightness of a fuel cell adhesive membrane (5), the air tightness testing device comprises: A first mold base (1) and a second mold base (2), wherein the second mold base (2) is connected to the first mold base (1) and together defines an installation space (3), and a gas passage (71) is provided in the first mold base (1); A test assembly (4) and a pressure seat (6), wherein the test assembly (4) comprises a first test piece (41) and a second test piece (42), wherein the first test piece (41) and the second test piece (42) are suitable for being bonded by the adhesive film (5) and are suitable for defining a test space (43) together with the adhesive film (5), at least a portion of the test assembly (4) is arranged in the installation space (3), and at least a portion of the pressure seat (6) is arranged in the installation space (3) and presses the test assembly (4); A gas supply pipeline (7) and a flow meter (8), wherein the gas supply pipeline (7) is suitable for being connected to a gas source (72), the test assembly (4) has a connecting hole (44) connected to the test space (43), the gas channel (71) is connected between the connecting hole (44) and the gas supply pipeline (7), and the flow meter (8) is arranged on the gas supply pipeline (7).

2. The airtightness testing device (100) according to claim 1, characterized in that: The first mold base (1) and the second mold base (2) are detachably connected, the installation space (3) penetrates the second mold base (2) along the thickness direction of the second mold base (2), and the second test piece (42) is clamped between the first mold base (1) and the second mold base (2).

3. The airtightness testing device (100) according to claim 1, characterized in that: The first mold base (1) has a plurality of limiting members (11) on one side facing the second mold base (2); the plurality of limiting members (11) are arranged around the outside of the test component (4) and are used to limit the test component (4).

4. The airtightness testing device (100) according to claim 3, characterized in that: The plurality of position-limiting members (11) all have a guide surface (111), and in a direction from the second mold base (2) to the first mold base (1), the guide surface (111) gradually approaches a center position of the first mold base (1).

5. The airtightness testing device (100) according to claim 3, characterized in that: The second mold base (2) has a plurality of first matching holes (21), and the plurality of limiting members (11) are respectively located in the plurality of first matching holes (21).

6. The airtightness testing device (100) according to claim 1, characterized in that: The first mold base (1) has a plurality of first positioning portions (12), and the second mold base (2) has a plurality of second positioning portions (22), and the plurality of first positioning portions (12) are positioned and matched with the plurality of second positioning portions (22).

7. The airtightness testing device (100) according to claim 6, characterized in that: One of the first positioning portion (12) and the second positioning portion (22) is configured as a positioning column, and the other of the first positioning portion (12) and the second positioning portion (22) is configured as a positioning hole.

8. The airtightness testing device (100) according to claim 1, characterized in that: Also includes: A control valve (9), wherein the control valve (9) is arranged on the gas supply pipeline (7).

9. The airtightness testing device (100) according to claim 1, characterized in that: Also includes: A press machine, the press machine is located on a side of the press seat (6) away from the first mold seat (1) and is directly opposite to and spaced from the press seat (6).

10. The airtightness testing device (100) according to claim 1, characterized in that: Also includes: A sealing member (10), wherein the sealing member (10) is sandwiched between the second test member (42) and the first mold base (1).

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