Measuring device

Abstract

The utility model discloses a measuring device, which relates to the field of measurement and comprises a first pressing plate and a second pressing plate, the first pressing plate and the second pressing plate are oppositely arranged and can move close to each other or away from each other, and the first pressing plate and the second pressing plate can directly press or press two test pieces; the gas channel is communicated with the gas supply assembly; the air pressure detection piece is used for detecting air pressure in the air channel. Therefore, by calculating the difference value between the first air pressure value detected by the air pressure detection piece when the first pressing plate and the second pressing plate are directly pressed and the second air pressure value detected by the air pressure detection piece when the two test pieces are pressed by the first pressing plate and the second pressing plate, and calculating the ratio of the difference value to the first air pressure value, the air permeability of the test pieces can be quickly obtained; therefore, the test piece with the air permeability meeting the requirement can be quickly selected, and the material of the test piece meeting the requirement is used as the material of the adhesive tape and the frame film of the single battery, so that the model selection difficulty of the adhesive tape and the frame film of the single battery can be reduced.

Description

Technical Field

[0001] The utility model relates to the field of measurement, and in particular to a measuring device. Background Art

[0002] In the related art, a fuel cell can directly convert the chemical energy in hydrogen and oxygen into electrical energy through an electrochemical reaction, and only water is generated as a product. The fuel cell includes a single cell, and the single cell includes a bipolar plate and a membrane electrode. The main functions of the bipolar plate are to separate the reaction gases, introduce the reaction gases into the fuel cell through a flow field, collect and conduct the current, support the membrane electrode, and undertake the heat dissipation and drainage functions of the entire fuel cell. However, it is difficult to measure the transverse air permeability (the air permeability perpendicular to the thickness direction of the rubber strip) after the rubber strips of the single cell are bonded to each other and the transverse air permeability (the air permeability perpendicular to the thickness direction of the rubber strip) after the rubber strip is bonded to the membrane frame. Therefore, it is impossible to quickly select the rubber strip and the membrane frame with the air permeability meeting the requirements, resulting in difficulties in selecting the rubber strip and the membrane frame of the single cell. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide a measuring device which can quickly obtain the air permeability of a test piece, so as to quickly select a test piece with the air permeability meeting the requirements, and use the material of the test piece meeting the requirements as the material of the rubber strip and the frame membrane of the single cell, which is beneficial to reducing the difficulty in selecting the rubber strip and the frame membrane of the single cell.

[0004] According to the measuring device of the utility model, the measuring device is used to measure the air permeability of a test piece, and the measuring device includes: a first pressing plate and a second pressing plate, the first pressing plate and the second pressing plate are arranged opposite to each other and can move relatively closer or relatively farther away, and the first pressing plate and the second pressing plate can directly press together or press two test pieces together; a gas supply assembly, a gas channel is formed in the first pressing plate, the gas channel faces the second pressing plate and is open, and the gas channel is communicated with the gas supply assembly, and the gas supply assembly is used to supply gas to the gas channel; a pressure detection member, and the pressure detection member is used to detect the pressure in the gas channel.

[0005] According to the measuring device of the present utility model, by calculating the difference between the first air pressure value detected by the air pressure detecting member when the first pressing plate and the second pressing plate are directly pressed together and the second air pressure value detected by the air pressure detecting member when the first pressing plate and the second pressing plate press two test pieces together, and calculating the ratio of the difference to the first air pressure value, the air permeability of the test piece can be quickly obtained, so that the test piece with a qualified air permeability can be quickly selected, and the material of the test piece that meets the requirements can be used as the material of the adhesive strip and the border film of the single cell, which is beneficial to reducing the difficulty of selecting the adhesive strip and the border film of the single cell.

[0006] In some examples of the present utility model, the measuring device further includes: a driving member, and the driving member is used to drive the first pressing plate and / or the second pressing plate so that the first pressing plate and the second pressing plate move relatively closer or relatively farther away.

[0007] In some examples of the present utility model, the gas supply assembly includes an air compressor, and the air compressor is selectively communicated with the gas channel.

[0008] In some examples of the present utility model, the gas supply assembly includes an inert gas container, and the inert gas container and the air compressor are alternatively communicated with the gas channel.

[0009] In some examples of the present utility model, the inert gas container includes a helium gas container and / or a nitrogen gas container.

[0010] In some examples of the present utility model, the driving member includes a connected driving body and a driving part, the driving part is connected to the second pressing plate, and the driving body is used to drive the driving part to act so that the second pressing plate moves towards or away from the first pressing plate.

[0011] In some examples of the present utility model, a sealing member is provided on the surface of the first pressing plate facing the second pressing plate or the surface of the second pressing plate facing the first pressing plate.

[0012] In some examples of the present utility model, the measuring device further includes: a switching valve, the switching valve is arranged between the gas supply assembly and the gas channel, and is used to control the on-off of the gas supply assembly and the gas channel.

[0013] In some examples of the present utility model, the gas channel includes a first sub-channel and a second sub-channel, the first sub-channel is communicated between the second sub-channel and the gas supply assembly, and the second sub-channel opens towards the second pressing plate; the center line of the first sub-channel and the center line of the second sub-channel have an included angle.

[0014] In some examples of the present utility model, the center line of the second sub-channel coincides with the center line of the first pressing plate.

[0015] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. Description of the Drawings

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

[0017] Figure 1 is a schematic diagram of a measuring device according to an embodiment of the present utility model.

[0018] Reference Signs:

[0019] Measuring device 100;

[0020] First pressing plate 10; gas passage 11; first sub-passage 111; second sub-passage 112;

[0021] Second pressing plate 20;

[0022] Gas supply assembly 30; air compressor 31; inert gas container 32;

[0023] Air pressure detection component 40; driving component 50; test piece 60; switching valve 70; sealing component 80;

[0024] First pipeline 1; second pipeline 2; third pipeline 3; fourth pipeline 4. Detailed Embodiments

[0025] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present utility model and should not be construed as limiting the present utility model.

[0026] Reference will be made below to Figure 1 describe the measuring device 100 according to an embodiment of the present utility model. The measuring device 100 is used to measure the air permeability of the test piece 60.

[0027] As Figure 1 shown, the measuring device 100 according to an embodiment of the present utility model includes: a first pressing plate 10, a second pressing plate 20, a gas supply assembly 30, and an air pressure detection component 40.

[0028] The first pressing plate 10 and the second pressing plate 20 are arranged opposite to each other and can move relatively closer or relatively farther away, and the first pressing plate 10 and the second pressing plate 20 can be directly pressed together or press two test pieces 60 together; a gas channel 11 is formed in the first pressing plate 10, the gas channel 11 is open towards the second pressing plate 20, and the gas channel 11 is communicated with a gas supply assembly 30, and the gas supply assembly 30 is used for supplying gas to the gas channel 11; a gas pressure detection member 40 is used for detecting the gas pressure in the gas channel 11.

[0029] Wherein, the first pressing plate 10 and the second pressing plate 20 are arranged opposite to each other, that is to say, the first pressing plate 10 and the second pressing plate 20 are correspondingly arranged. As some embodiments of the present application, along the height direction of the measuring device 100 (i.e., Figure 1 the Z direction shown in the figure), the orthographic projection of the first pressing plate 10 completely coincides with the orthographic projection of the second pressing plate 20.

[0030] The first pressing plate 10 and the second pressing plate 20 can move relatively closer or relatively farther away. Specifically, when the first pressing plate 10 and the second pressing plate 20 move relatively closer, the first pressing plate 10 and the second pressing plate 20 will be pressed together, and when the first pressing plate 10 and the second pressing plate 20 move relatively farther away, the first pressing plate 10 and the second pressing plate 20 will be separated. The first pressing plate 10 and the second pressing plate 20 can be directly pressed together.

[0031] Two test pieces 60 can be arranged between the first pressing plate 10 and the second pressing plate 20. The first pressing plate 10 and the second pressing plate 20 can press the two test pieces 60 together. Specifically, the two test pieces 60 can be stacked along the moving direction of the first pressing plate 10 and / or the second pressing plate 20, and the first pressing plate 10 and the second pressing plate 20 can press the two stacked test pieces 60 together.

[0032] A gas channel 11 is formed in the first pressing plate 10. The gas channel 11 has opposite ends. One end of the gas channel 11 is open towards the second pressing plate 20, and the other end of the gas channel 11 is communicated with the gas supply assembly 30. The gas supply assembly 30 can supply gas to the gas channel 11 so that the gas flows into the space between the first pressing plate 10 and the second pressing plate 20 through the gas channel 11. The gas pressure detection member 40 can be communicated with the gas channel 11.

[0033] It should be noted that the measuring device 100 is used to measure the transverse air permeability of the test piece 60 (the air permeability perpendicular to the thickness direction of the test piece 60).

[0034] First, drive the first pressing plate 10 and / or the second pressing plate 20 to move so that the first pressing plate 10 and the second pressing plate 20 are directly pressed together, and supply gas with a preset pressure (such as gas of 0 - 6 mpa, specifically, the gas with a preset pressure can be but not limited to 2 mpa of gas, 4 mpa of gas, 6 mpa of gas) to the gas passage 11 through the gas supply assembly 30, and wait for a preset time (such as but not limited to five minutes), and record the value of the air pressure detection member 40, which is denoted as the first air pressure value P1.

[0035] Then, drive the first pressing plate 10 and / or the second pressing plate 20 to move so that the first pressing plate 10 and the second pressing plate 20 are separated, place two test pieces 60 between the first pressing plate 10 and the second pressing plate 20, drive the first pressing plate 10 and / or the second pressing plate 20 to move so that the first pressing plate 10 and the second pressing plate 20 press the two test pieces 60 together, and supply gas with a preset pressure (such as gas of 0 - 6 mpa, specifically, the gas with a preset pressure can be but not limited to 2 mpa of gas, 4 mpa of gas, 6 mpa of gas) to the gas passage 11 through the gas supply assembly 30, and wait for a preset time (such as but not limited to five minutes), and record the value of the air pressure detection member 40, which is denoted as the second air pressure value P2.

[0036] By calculating the absolute value of the difference between P1 and P2 and calculating the ratio of the difference to the first air pressure value P1, the air permeability of the test piece 60 can be obtained. It should be noted that the gas pressure supplied to the gas passage 11 through the gas supply assembly 30 during the process of directly pressing the first pressing plate 10 and the second pressing plate 20 together is the same as the gas pressure supplied to the gas passage 11 through the gas supply assembly 30 during the process of pressing the two test pieces 60 together by the first pressing plate 10 and the second pressing plate 20.

[0037] It can be understood that the materials of the two test pieces 60 can simulate the rubber strip and the rubber strip, or the materials of the two test pieces 60 can simulate the rubber strip and the film frame, so that the rubber strip and the film frame with air permeability meeting the requirements can be quickly selected, which is convenient for the selection of the rubber strip and the film frame of the single cell.

[0038] Thus, by calculating the difference between the first air pressure value detected by the air pressure detection member 40 when the first pressing plate 10 and the second pressing plate 20 are directly pressed together and the second air pressure value detected by the air pressure detection member 40 when the first pressing plate 10 and the second pressing plate 20 press the two test pieces 60 together, and calculating the ratio of the difference to the first air pressure value, the air permeability of the test piece 60 can be quickly obtained, so that the test piece with air permeability meeting the requirements can be quickly selected, and the materials of the test piece 60 meeting the requirements are used as the materials of the rubber strip and the frame film of the single cell, which is beneficial to reducing the selection difficulty of the rubber strip and the frame film of the single cell.

[0039] In some embodiments of the present utility model, such asFigure 1 As shown in the figure, the measuring device 100 further includes a driving member 50 for driving the first pressing plate 10 and / or the second pressing plate 20 so that the first pressing plate 10 and the second pressing plate 20 move relatively closer or relatively farther away from each other.

[0040] Among them, the measuring device 100 further includes a driving member 50. The driving member 50 can drive the first pressing plate 10, or the driving member 50 can drive the second pressing plate 20, or the driving member 50 can drive the first pressing plate 10 and the second pressing plate 20. As some embodiments of the present application, the driving member 50 can be a press. The driving member 50 can drive the first pressing plate 10 towards or away from the second pressing plate 20 so that the first pressing plate 10 and the second pressing plate 20 move relatively closer or relatively farther away from each other, or the driving member 50 can drive the second pressing plate 20 towards or away from the first pressing plate 10 so that the first pressing plate 10 and the second pressing plate 20 move relatively closer or relatively farther away from each other, or the driving member 50 can drive the first pressing plate 10 and the second pressing plate 20 towards each other or away from each other so that the first pressing plate 10 and the second pressing plate 20 move relatively closer or relatively farther away from each other.

[0041] By providing the driving member 50, on the one hand, it can ensure that the first pressing plate 10 and the second pressing plate 20 are closely attached, and on the other hand, it can control the pressure between the first pressing plate 10 and the second pressing plate 20, which is convenient for measuring the air permeability of the test piece 60 under different pressures.

[0042] In some embodiments of the present utility model, as Figure 1 shown, the gas supply assembly 30 includes an air compressor 31, and the air compressor 31 is selectively communicated with the gas channel 11.

[0043] Among them, the gas supply assembly 30 includes an air compressor 31 for providing air with a stable pressure. The air compressor 31 is connected to the gas channel 11 through the first pipeline 1. When the air compressor 31 is working, the air compressor 31 is communicated with the gas channel 11, and when the air compressor 31 is not working, the air compressor 31 is not communicated with the gas channel 11.

[0044] By making the gas supply assembly 30 include an air compressor 31, it can provide continuous and stable-pressure air for the gas channel 11. Moreover, by supplying air to the gas channel 11 through the air compressor 31, it can simulate the cathode side of the fuel cell bipolar plate, which can make the measured air permeability result of the measuring device 100 accurate and more in line with the actual situation, and is beneficial to improving the use reliability of the measuring device 100.

[0045] In some embodiments of the present utility model, as Figure 1 shown, the gas supply assembly 30 includes an inert gas container 32, and the inert gas container 32 and the air compressor 31 are selectively communicated with the gas channel 11.

[0046] Among them, the gas supply component 30 further includes an inert gas container 32, and the inert gas container 32 is connected to the gas passage 11 through the second pipeline 2. As some embodiments of the present application, the inert gas container 32 can be a carbon fiber wound high-pressure gas cylinder.

[0047] By making the gas supply component 30 include the inert gas container 32, a continuous and stable-pressure inert gas can be provided for the gas passage 11. Moreover, by providing the inert gas from the inert gas container 32 to the gas passage 11, the anode side of the fuel cell bipolar plate can be simulated, enabling the air permeability rate measured by the measuring device 100 to be accurate and more in line with the actual situation, which is beneficial to improving the use reliability of the measuring device 100. It can be understood that the anode side of the fuel cell bipolar plate is hydrogen, but since hydrogen is an active gas, replacing hydrogen with an inert gas can reduce the probability of safety accidents and is beneficial to improving the measurement safety.

[0048] Moreover, it can be understood that the inert gas container 32 and the air compressor 31 are selectively connected to the gas passage 11. That is to say, the measuring device 100 proposed in the present application can simulate the anode side of the fuel cell bipolar plate according to the actual measurement requirements, or can simulate the cathode side of the fuel cell bipolar plate according to the actual measurement requirements, which is beneficial to expanding the application scope of the measuring device 100.

[0049] In some embodiments of the present invention, as Figure 1 shown, the inert gas container 32 includes a helium gas container and / or a nitrogen gas container.

[0050] Among them, the inert gas container 32 includes a helium gas container, or the inert gas container 32 includes a nitrogen gas container, or, as Figure 1 shown, the inert gas container 32 includes a helium gas container and a nitrogen gas container.

[0051] Taking the inert gas container 32 including a helium gas container and a nitrogen gas container as an example, during the measurement, helium gas can be provided to the gas passage 11 through the helium gas container, or nitrogen gas can be provided to the gas passage 11 through the nitrogen gas container during the measurement.

[0052] By making the inert gas container 32 include a helium gas container and / or a nitrogen gas container, multiple types of inert gases can be provided, so that the specific inert gas can be selected according to actual needs, enabling the air permeability rate measured by the measuring device 100 to be accurate and more in line with the actual situation, which is beneficial to improving the accuracy of the measurement results.

[0053] In some embodiments of the present invention, the driving member 50 includes a connected driving body and a driving part. The driving part is connected to the second pressing plate 20, and the driving body is used to drive the driving part to act, so that the second pressing plate 20 moves towards or away from the first pressing plate 10.

[0054] Among them, the driving member 50 can be, but is not limited to, an electric press, a hydraulic press, etc. As some embodiments of the present application, the driving member 50 is a hydraulic press. The driving body and the driving part are connected. The second pressing plate 20 and the driving part are connected. The connection manner between the second pressing plate 20 and the driving part can be, but is not limited to, bolt connection, clamping, etc. As some embodiments of the present application, the second pressing plate 20 and the driving part are connected by bolt connection.

[0055] The driving body can drive the driving part to act so that the driving part drives the second pressing plate 20. The driving part can drive the second pressing plate 20 to face or move away from the first pressing plate 10, so that the first pressing plate 10 and the second pressing plate 20 are relatively close or relatively far away from each other.

[0056] By making the driving member 50 include a connected driving body and driving part, and by connecting the driving part to the second pressing plate 20, the second pressing plate 20 can be driven to move by the driving member 50, so as to realize that the first pressing plate 10 and the second pressing plate 20 are relatively close or relatively far away from each other. In this way, the position of the first pressing plate 10 does not need to be changed, which can reduce the probability of the connection pipeline between the gas channel 11 and the gas supply assembly 30 falling off, and is beneficial to improving the use reliability of the measuring device 100.

[0057] In some embodiments of the present utility model, as Figure 1 shown, the measuring device 100 further includes: a third pipeline 3. The third pipeline 3 is communicated with both the first pipeline 1 and the second pipeline 2, and the third pipeline 3 is communicated with the gas channel 11.

[0058] Among them, the measuring device 100 further includes a third pipeline 3. The third pipeline 3 has opposite ends, one of which is communicated with the gas channel 11, and the other end is communicated with both the first pipeline 1 and the second pipeline 2. The gas in the first pipeline 1 and the second pipeline 2 can enter the gas channel 11 through the third pipeline 3.

[0059] As some embodiments of the present application, one end of the third pipeline 3 is communicated with the gas channel 11, and a multi-way gas pipe joint is arranged at the other end of the third pipeline 3. The third pipeline 3 is communicated with both the first pipeline 1 and the second pipeline 2 through the multi-way gas pipe joint.

[0060] By providing the third pipeline 3, the first pipeline 1 and the gas channel 11 can be communicated through the third pipeline 3, and the second pipeline 2 and the gas channel 11 can be communicated through the third pipeline 3. Thus, it is beneficial to shorten the overall pipeline length of the measuring device 100 and is beneficial to reducing the manufacturing cost of the measuring device 100. Moreover, by setting it in this way, the gas channel 11 only needs to be provided with one interface for cooperating with the gas supply assembly 30, which is beneficial to reducing the production difficulty of the first pressing plate 10.

[0061] In some embodiments of the present utility model, as Figure 1 shown, the air pressure detection member 40 is communicated with the third pipeline 3 through the fourth pipeline 4.

[0062] Wherein, the measuring device 100 further includes a fourth pipeline 4. The fourth pipeline 4 has opposite ends, one end of which is communicated with the third pipeline 3, and the other end is communicated with the air pressure detection member 40. The air pressure detection member 40 is communicated with the third pipeline 3 through the fourth pipeline 4.

[0063] As some embodiments of the present application, the measuring device 100 may include a multi-way gas pipe joint. The multi-way gas pipe joint may include four interfaces, and the four interfaces of the multi-way gas pipe joint may be respectively communicated with the first pipeline 1, the second pipeline 2, the third pipeline 3, and the fourth pipeline 4.

[0064] Such a setting can enable the air pressure detection member 40 to be communicated with the gas channel 11, so as to directly and accurately obtain the gas pressure P1 when the first pressing plate 10 and the second pressing plate 20 are directly pressed together, and can directly obtain the gas pressure P2 when the first pressing plate 10 and the second pressing plate 20 press two test pieces 60 together, which is beneficial to improving the accuracy of the measurement result.

[0065] In some embodiments of the present utility model, as Figure 1 shown, a sealing member 80 is provided on the surface of the first pressing plate 10 facing the second pressing plate 20 or on the surface of the second pressing plate 20 facing the first pressing plate 10.

[0066] As some embodiments of the present application, the sealing member 80 may be, but is not limited to, an O-ring, a star-shaped ring, etc. As some embodiments of the present application, the sealing member 80 is an O-ring.

[0067] A sealing member 80 is provided on the surface of the first pressing plate 10 facing the second pressing plate 20, or a sealing member 80 is provided on the surface of the second pressing plate 20 facing the first pressing plate 10. As some embodiments of the present application, when a sealing member 80 is provided on the surface of the first pressing plate 10 facing the second pressing plate 20, a groove may be provided on the surface of the first pressing plate 10 facing the second pressing plate 20, and the sealing member 80 is partially disposed in the groove on the surface of the first pressing plate 10 facing the second pressing plate 20. As some embodiments of the present application, when a sealing member 80 is provided on the surface of the second pressing plate 20 facing the first pressing plate 10, a groove may be provided on the surface of the second pressing plate 20 facing the first pressing plate 10, and the sealing member 80 is partially disposed in the groove on the surface of the second pressing plate 20 facing the first pressing plate 10.

[0068] When the first pressing plate 10 and the second pressing plate 20 are directly pressed together, the seal 80 can be squeezed between the first pressing plate 10 and the second pressing plate 20 to improve the sealing performance of the measuring device 100. It can be understood that when the first pressing plate 10 and the second pressing plate 20 press two test pieces 60 together, the thickness of the two test pieces 60 is greater than the thickness of the seal 80. That is to say, the seal 80 will not be squeezed between the first pressing plate 10 and the second pressing plate 20, thus not affecting the accuracy of detecting the air permeability.

[0069] In some embodiments of the present invention, as Figure 1 shown, the measuring device 100 further includes: a switching valve 70, which is arranged between the gas supply assembly 30 and the gas passage 11 and is used to control the on-off of the gas supply assembly 30 and the gas passage 11.

[0070] Among them, the measuring device 100 further includes a switching valve 70, which is arranged between the gas supply assembly 30 and the gas passage 11. As some embodiments of the present application, the switching valve 70 can be configured as an electromagnetic valve. The switching valve 70 has two states: open and closed. When the switching valve 70 is open, the gas supply assembly 30 and the gas passage 11 are connected; when the switching valve 70 is closed, the gas supply assembly 30 and the gas passage 11 are disconnected.

[0071] As some embodiments of the present application, the switching valve 70 is arranged on the third pipeline 3.

[0072] By arranging the switching valve 70 between the gas supply assembly 30 and the gas passage 11, the on-off of the gas supply assembly 30 and the gas passage 11 can be controlled. When it is not necessary to introduce gas into the gas passage 11, the gas supply assembly 30 and the gas passage 11 can be disconnected, which can reduce the probability of gas leakage of the measuring device 100.

[0073] In some embodiments of the present invention, as Figure 1 shown, the gas passage 11 includes a first sub-channel 111 and a second sub-channel 112. The first sub-channel 111 is connected between the second sub-channel 112 and the gas supply assembly 30, and the second sub-channel 112 opens towards the second pressing plate 20; the center line of the first sub-channel 111 and the center line of the second sub-channel 112 have an included angle.

[0074] Among them, the gas passage 11 includes a first sub-passage 111 and a second sub-passage 112. The first sub-passage 111 has opposite ends, one of which communicates with the second sub-passage 112, and the other communicates with the gas supply assembly 30. The second sub-passage 112 has opposite ends, one of which communicates with the first sub-passage 111, and the other opens towards the second pressing plate 20. That is to say, the gas supply assembly 30 is sequentially communicated with the space between the first pressing plate 10 and the second pressing plate 20 through the first sub-passage 111 and the second sub-passage 112, and the gas supplied by the gas supply assembly 30 sequentially flows into the space between the first pressing plate 10 and the second pressing plate 20 through the first sub-passage 111 and the second sub-passage 112.

[0075] The center line of the first sub-passage 111 and the center line of the second sub-passage 112 form an included angle, that is to say, the first sub-passage 111 and the second sub-passage 112 are not parallel.

[0076] Such a setting can make one port of the gas passage 11 face the second pressing plate 20, and can make the other port of the gas passage 11 located on the side surface of the first pressing plate 10 (the side surface is not parallel to the surface of the first pressing plate 10 facing the second pressing plate 20), so as to facilitate the connection between the gas supply assembly 30 and the gas passage 11 and reduce the assembly difficulty of the measuring device 100.

[0077] As some embodiments of the present application, the sizes and shapes of the first pressing plate 10 and the second pressing plate 20 are the same. As some embodiments of the present application, the shapes of the first pressing plate 10 and the second pressing plate 20 can be constructed as cylinders.

[0078] In some embodiments of the present invention, as Figure 1 shown, the center line of the second sub-passage 112 coincides with the center line of the first pressing plate 10.

[0079] Among them, as some embodiments of the present application, the center line of the second sub-passage 112 can be parallel to the height direction of the measuring device 100 (that is, the Figure 1 Z direction shown in), and, the center line of the first pressing plate 10 can be parallel to the height direction of the measuring device 100 (that is, the Figure 1 Z direction shown in), and, the center line of the second sub-passage 112 coincides with the center line of the first pressing plate 10.

[0080] By making the center line of the second sub-passage 112 coincide with the center line of the first pressing plate 10, the setting position of the second sub-passage 112 can be reasonable, and the gas in the second sub-passage 112 can be directly introduced into the central area of the space of the first pressing plate 10 facing the second pressing plate 20, thus being beneficial to improving the measurement accuracy of the measuring device 100.

[0081] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0082] In the description of the present utility model, "the first feature" and "the second feature" may include one or more of such features.

[0083] In the description of the present utility model, the meaning of "a plurality of" is two or more.

[0084] In the description of the present utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0085] In the description of the present utility model, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0086] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0087] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A measuring device, characterized in that, The measurement device is used to measure the air permeability of a test piece, and the measurement device includes: A first pressing plate and a second pressing plate, the first pressing plate and the second pressing plate are arranged opposite to each other and can move relatively closer or relatively farther away, and the first pressing plate and the second pressing plate can directly press together or press two test pieces together; A gas supply assembly, a gas passage is provided in the first pressing plate, the gas passage opens towards the second pressing plate, and the gas passage is communicated with the gas supply assembly, and the gas supply assembly is used to supply gas to the gas passage; A barometric pressure detection piece, which is used to detect the barometric pressure in the gas passage.

2. The measuring device according to claim 1, characterized in that, It further includes: A driving piece, which is used to drive the first pressing plate and / or the second pressing plate, so that the first pressing plate and the second pressing plate move relatively closer or relatively farther away.

3. The measuring device according to claim 1, characterized in that, The gas supply assembly includes an air compressor, and the air compressor is selectively communicated with the gas passage.

4. The measuring device according to claim 3, characterized in that, The gas supply assembly includes an inert gas container, and the inert gas container and the air compressor are selectively communicated with the gas passage.

5. The measuring device according to claim 4, characterized in that, The inert gas container includes a helium gas container and / or a nitrogen gas container.

6. The measuring device according to claim 2, characterized in that, The driving piece includes a connected driving body and a driving part, the driving part is connected to the second pressing plate, and the driving body is used to drive the driving part to act, so that the second pressing plate moves towards or away from the first pressing plate.

7. The measuring device according to claim 1, characterized in that, A sealing member is provided on the surface of the first pressing plate facing the second pressing plate or the surface of the second pressing plate facing the first pressing plate.

8. The measuring device according to any one of claims 1-7, characterized in that It further includes: A switching valve, which is arranged between the gas supply assembly and the gas passage and is used to control the on-off of the gas supply assembly and the gas passage.

9. The measuring device according to any one of claims 1-7, characterized in that, The gas passage includes a first sub-passage and a second sub-passage, the first sub-passage is communicated between the second sub-passage and the gas supply assembly, and the second sub-passage opens towards the second pressing plate; the center line of the first sub-passage and the center line of the second sub-passage form an included angle.

10. The measuring device according to claim 9, characterized in that, The center line of the second sub-passage coincides with the center line of the first pressing plate.

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