Air permeability testing cavity capable of automatically leveling
By introducing a leveling mechanism into the air permeability test chamber, and utilizing the elastic support and ball head to adapt to the irregular sample surface, the sealing problem of existing air permeability meters for irregular samples is solved, and efficient and reliable air permeability measurement is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JINAN SIKE TESTING TECH CO LTD
- Filing Date
- 2025-08-15
- Publication Date
- 2026-05-19
AI Technical Summary
Existing air permeability meters are difficult to effectively test irregularly shaped samples, leading to poor sealing, gas leakage, and distorted measurement results.
An automatic leveling permeability test chamber is adopted. The leveling mechanism automatically levels uneven samples and uses elastic supports and leveling ball heads to adapt to the surface shape of the sample to ensure a sealing effect.
It achieves uniform and reliable sealing of irregularly shaped samples, improves the automation and repeatability of testing, and ensures the accuracy of measurement results.
Smart Images
Figure CN224263035U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of material air permeability testing, specifically an automatically leveled air permeability testing chamber. Background Technology
[0002] The permeability of materials such as battery separators, carbon paper, and graphite is a key parameter affecting the performance of their final products (e.g., lithium batteries, fuel cells), including charge / discharge efficiency, energy density, safety, and lifespan. Accurate measurement of the permeability of these materials is crucial for material research and development, quality control, and product performance prediction. Currently, mainstream permeability meters on the market are designed for flat, regularly shaped plate samples with smooth surfaces. Their test chambers typically consist of fixed upper and lower cavities, achieving a seal by applying pressure to compress the sample edges. For irregularly shaped samples, the rigid pressing surface of existing test chambers cannot completely adhere to the sample surface, creating gaps at uneven areas. This leads to test gas leakage (or external gas infiltration), severely interfering with permeability measurement results, causing data distortion, or even test failure.
[0003] Therefore, existing technology limits the ability of air permeability meters to effectively test materials with special shapes (such as prototype materials under development, recycled materials, and non-standard samples generated by specific processes). In order to test materials with special shapes, users may need to try various methods (such as adding gaskets or applying sealant) to try to improve the seal, but the effect is often poor and may contaminate the sample. The operation is cumbersome and the results are not reproducible. Utility Model Content
[0004] To address the shortcomings of existing technologies, this invention provides an automatically leveling air permeability testing chamber that can effectively seal samples of different thicknesses, thereby accurately testing the air permeability performance of uneven and irregularly shaped samples.
[0005] To solve the aforementioned technical problem, the present invention adopts the following technical solution: an automatically leveling air permeability testing chamber, comprising an upper testing chamber and a lower testing chamber, wherein the upper testing chamber and / or the lower testing chamber are connected to a leveling mechanism, the leveling mechanism comprising a mounting base and a leveling ball head, the mounting base being connected to the upper testing chamber and / or the lower testing chamber, the mounting base having a ball groove and an elastic support mounting hole, the leveling ball head being located in the ball groove, and an elastic support being provided in the elastic support mounting hole, one end of the elastic support facing the upper and / or lower testing chamber, the other end of the elastic support being located in the elastic support mounting hole, and a spring being provided between the elastic support and the mounting base, wherein when the spring is in its natural state, the end of the elastic support facing the upper and / or lower testing chamber is higher than the surface of the mounting base, thus supporting the upper and / or lower testing chamber.
[0006] Furthermore, the leveling ball head is shaped like a table, and the two bottom surfaces of the leveling ball head are equidistant from the center of the ball.
[0007] Furthermore, the ball groove extends longitudinally through the mounting base, and the bottom surface of the ball head facing the upper test cavity and / or lower test cavity is higher than the surface of the mounting base.
[0008] Furthermore, the leveling ball head has a pin hole, and the upper test chamber and / or lower test chamber are provided with pins that extend into the pin hole.
[0009] Furthermore, there are multiple mounting holes for the elastic support, which are distributed circumferentially around the ball groove.
[0010] Furthermore, a limiting elastic support is set among the multiple elastic supports. The height of the limiting elastic support is greater than the height of the other elastic supports. A U-shaped groove is opened at the position where the upper test cavity and / or lower test cavity contact the limiting elastic support, and the limiting elastic support is inserted into the U-shaped groove.
[0011] Furthermore, the surfaces of the elastic support that contact the upper and / or lower test chambers are arc surfaces.
[0012] The beneficial effects of this utility model are: the automatic leveling function is realized through the leveling mechanism, which can adapt to the testing of irregular samples, and achieve uniform, reliable and leak-free sealing on the sample surface, thereby improving the automation, reliability and repeatability of the test. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of Example 1;
[0014] Figure 2 This is a cross-sectional view of the upper and lower test chambers in Example 1;
[0015] Figure 3 A schematic diagram of the mounting base and leveling ball head;
[0016] Figure 4 A schematic diagram showing the ball head in different states on the mounting base for leveling purposes;
[0017] Figure 5 This is a top view of the mounting base in Example 1;
[0018] Figure 6 This is a cross-sectional view of the test chamber along the U-shaped groove in Example 1;
[0019] Figure 7 This is a bottom view of the lower cavity tested in Example 1;
[0020] Figure 8 This is a reference diagram showing the usage state of Example 1;
[0021] Figure 9 This is a reference diagram showing the usage state of Example 2;
[0022] In the diagram: 1. Upper test chamber, 2. Lower test chamber, 3. Drive mechanism, 4. Rubber washer, 5. Mounting base, 6. Leveling ball head, 7. Elastic support, 8. Spring, 9. Air hole in the upper test chamber, 10. Air hole in the lower test chamber, 11. Pin, 12. Pin hole, 13. Ball groove, 14. Mounting hole of the elastic support, 15. U-groove, 16. Sample. Detailed Implementation
[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0024] Example 1
[0025] This embodiment discloses an automatically leveling air permeability testing chamber, such as... Figure 1 , 2 As shown, the test chamber includes an upper test chamber 1 and a lower test chamber 2. The upper test chamber 1 has an air vent 9, and the lower test chamber 2 has an air vent 10. A rubber gasket 4 is provided at the contact point between the upper test chamber 1 and the lower test chamber 2. A driving mechanism 3 is provided on the upper test chamber 1. The driving mechanism 3 drives the upper test chamber 1 downwards to press against the lower test chamber 2, and the sample is installed between the upper test chamber 1 and the lower test chamber 2. The driving mechanism 3 is generally a component capable of linear motion, such as a cylinder, electric cylinder, or hydraulic cylinder.
[0026] To enable testing of irregularly shaped samples with uneven surfaces, a leveling mechanism is connected to the lower test chamber 2. This mechanism includes a mounting base 5 and a leveling ball head 6. The mounting base 5 is connected to the lower test chamber 2 and has a ball groove 13 and an elastic support mounting hole 14. The leveling ball head 6 is located within the ball groove 13 and can deflect within it. An elastic support 7 is installed within the elastic support mounting hole 14. One end of the elastic support 7 faces the lower test chamber 2, and the other end is located within the elastic support mounting hole 14. A spring 8 is installed between the elastic support 7 and the mounting base 5. When the spring 8 is in its natural state, the end of the elastic support facing the lower test chamber 2 is higher than the surface of the mounting base. The spring 8 keeps the elastic support 7 above the surface of the mounting base 5 and allows it to move downwards when the lower test chamber 2 shifts, and to automatically reset itself when the lower test chamber 2 returns to a parallel state.
[0027] For ease of installation, such as Figure 3 As shown, the leveling ball head 6 is shaped like a table, and the two bottom surfaces of the leveling ball head 6 are equidistant from the center of the ball. The ball groove 13 extends longitudinally through the mounting base 5. When the leveling ball head 6 is not deflected, the bottom surface of the leveling ball head 6 facing the lower test cavity 2 is higher than the surface of the mounting base. The leveling ball head 6 can deflect within the ball groove 13, such as... Figure 4 As shown in Figure a, if the sample has two flat surfaces, the leveling ball head 6 will not deflect within the ball groove 13, as... Figure 4As shown in b, if the sample has an uneven surface, the driving pressure test chamber 1 is pressed down. In order to adapt to the uneven surface of the sample, the leveling ball head 6 deflects in the ball groove 13, still achieving clamping of the sample and achieving a uniform, reliable, and leak-free seal on the sample surface.
[0028] like Figure 2 , 6 As shown in Figure 7, the leveling ball head 6 has a pin hole 12, and the lower test chamber 2 is provided with a pin 11 that extends into the pin hole 12. The leveling mechanism and the lower test chamber are connected through the pin-pin connection. To prevent the lower test chamber 2 from rotating during the test, a limiting elastic support is set among the multiple elastic supports 7. The height of the limiting elastic support is greater than the height of the other elastic supports. A U-shaped groove 15 is opened at the contact position between the lower test chamber 2 and the limiting elastic support. The limiting elastic support is inserted into the U-shaped groove 15 to limit the lower test chamber 2.
[0029] like Figure 5 As shown, there are 3 elastic support mounting holes, which are distributed in a circle around the ball groove 13.
[0030] To allow for greater freedom of movement, the surfaces of the elastic support that contact the upper and / or lower test chambers are circular arc surfaces.
[0031] During testing, the upper test chamber 1, driven by the drive mechanism 3, moves downward and clamps the sample 16. Under the action of the leveling ball head 6 and the three elastic supports 7, the lower test chamber 2 can be deflected in any direction within the plane, ensuring parallelism with the sample, and a seal is formed by the rubber gasket 4. Test gas is injected through the vent in either the upper test chamber 1 or the lower test chamber 2, passes through the sample, and flows out through the vent in either the lower test chamber 2 or the upper test chamber 1.
[0032] Figure 8 This is a reference diagram showing the usage state of the air permeability test chamber described in this embodiment. If the original test chamber structure is used, it is obviously impossible to achieve effective sealing. However, by using the structure shown in this embodiment, the lower test chamber 2 can be adapted to the shape of the sample 16, so that the rubber gasket 4 can completely fit the sample 16, thereby achieving a good seal.
[0033] Example 2
[0034] In this embodiment, both the upper test chamber 1 and the lower test chamber 2 are connected to a leveling mechanism, such as... Figure 9 As shown, the test cavity described in this embodiment has more degrees of freedom for deflection and is suitable for samples with uneven surfaces on both sides.
[0035] The air permeability test chamber described in this application is used to measure the air permeability index of materials such as battery separators, exchange membranes, carbon paper plates, and graphite.
[0036] The above description is only the basic principle and preferred embodiment of this utility model. Any improvements and substitutions made by those skilled in the art based on this utility model shall fall within the protection scope of this utility model.
Claims
1. An automatically leveling air permeability testing chamber, comprising an upper testing chamber and a lower testing chamber, characterized in that: The upper test cavity and / or lower test cavity are connected to a leveling mechanism. The leveling mechanism includes a mounting base and a leveling ball head. The mounting base is connected to the upper test cavity and / or lower test cavity. The mounting base has a ball groove and an elastic support mounting hole. The leveling ball head is located in the ball groove. An elastic support is installed in the elastic support mounting hole. One end of the elastic support faces the upper test cavity and / or lower test cavity, and the other end of the elastic support is located in the elastic support mounting hole. A spring is provided between the elastic support and the mounting base. When the spring is in its natural state, the end of the elastic support facing the upper test cavity and / or lower test cavity is higher than the surface of the mounting base, thus supporting the upper test cavity and / or lower test cavity.
2. The automatically leveling air permeability testing chamber according to claim 1, characterized in that: The leveling ball head is shaped like a table, and the two bottom surfaces of the leveling ball head are equidistant from the center of the ball.
3. The automatically leveling air permeability testing chamber according to claim 1 or 2, characterized in that: The ball groove runs longitudinally through the mounting base, and the ball head is leveled so that it faces the bottom surface of the upper test cavity and / or the lower test cavity and is higher than the surface of the mounting base.
4. The automatically leveling air permeability testing chamber according to claim 1 or 2, characterized in that: The leveling ball head has a pin hole, and the upper test chamber and / or lower test chamber are equipped with pins that extend into the pin hole.
5. The automatically leveling air permeability testing chamber according to claim 1, characterized in that: There are multiple mounting holes for the elastic support, which are distributed in a circle around the ball groove.
6. The automatically leveling air permeability testing chamber according to claim 5, characterized in that: A limiting elastic support is set among multiple elastic supports. The height of the limiting elastic support is greater than the height of the other elastic supports. A U-shaped groove is opened at the position where the upper test cavity and / or lower test cavity contact the limiting elastic support, and the limiting elastic support is inserted into the U-shaped groove.
7. The automatically leveling air permeability testing chamber according to claim 1, characterized in that: The surface of the elastic support that contacts the upper and / or lower test chambers is an arc surface.