Air leakage testing device and testing method
By setting shells and sensors on both sides of the substrate of the leak test device, quickly detecting air pressure changes, solving the problems of long test time and high cost in the prior art, and avoiding microphone leakage through the design of placing a chunk The detection situation achieves efficient and accurate air leakage detection.
Patent Information
- Application Number
- CN202411391429.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2024-12-27
AI Technical Summary
The existing air leakage test device has a long test time, is expensive and costly, and the briquetting can easily cause the air leakage gap between the microphone and the PCB to be pressed, resulting in the air leakage being unable to be detected.
Design a leak test device, by providing a first shell and a second shell on both sides of the substrate, the product to be tested is placed in the first shell, and the sensor in the second shell detects the air pressure changes, and quickly determines the air leakage. In the case, a normal sensor is used for pressure detection, reducing costs, and placing a chunk on the substrate to avoid the gap between the microphone and the PCB being pressed.
It realizes fast and efficient air leakage detection, reduces costs, and avoids the problem of microphone leakage that cannot be detected, improving detection efficiency and accuracy.
Smart Images
Figure CN119197927A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of air leakage detection, and more specifically, to an air leakage testing device and a testing method. Background Art
[0002] Traditional air leakage testing devices use airtightness leak detectors to perform inflation tests. Fix the microphone in a sealed cavity, and use a leak detector to inflate the sealed cavity. After the air pressure in the cavity stabilizes, the leak detector detects whether there is any leakage in the air pressure in the cavity, thereby determining whether the microphone is leaking. However, existing air leakage testing devices use leak detectors for testing, which takes a long time and is expensive. In addition, in the testing methods of the prior art, a pressure block is usually placed on the microphone, which can easily cause the leakage gap between the microphone and the PCB (PCB: Printed Circuit Board, referred to as printed circuit board) to be pressed together, resulting in the problem that microphone leakage cannot be detected. Summary of the invention
[0003] One object of the present invention is to provide a new technical solution for a leakage testing device and a testing method, which can at least solve the problems of long testing time, high price and high cost of the testing device in the prior art.
[0004] According to a first aspect of the present invention, there is provided an air leakage testing device, comprising: a substrate, on which a sound hole is provided; a first shell, which is arranged on a first side of the substrate, and in which a first cavity for placing a product to be tested is provided, the product to be tested covers the sound hole, and the first cavity is used to introduce airflow; a second shell, which is arranged on a second side of the substrate, and in which a second cavity connected to the sound hole is provided; and a sensor, which is arranged in the second cavity to detect the air pressure in the second cavity.
[0005] Optionally, the substrate is a circuit board.
[0006] Optionally, the air leakage testing device further comprises: a pressing block, wherein the pressing block is disposed in the first cavity and is placed on the substrate.
[0007] Optionally, there are a plurality of pressing blocks, and the plurality of pressing blocks are arranged on the substrate at intervals.
[0008] Optionally, an orthographic projection area of the first shell on the substrate is larger than an orthographic projection area of the second shell on the substrate.
[0009] Optionally, the first shell is sealed to the substrate, and the second shell is adhesively connected to the substrate.
[0010] Optionally, a sealing rubber pad is provided between the second shell and the substrate.
[0011] Optionally, an orthographic projection area of the sealing rubber pad on the substrate is larger than an orthographic projection area of the second shell on the substrate.
[0012] A second aspect of the present invention provides a testing method for a leakage testing device, which is used to test whether a product to be tested by the leakage testing device described in the above embodiment is leaking. The testing method comprises:
[0013] Placing the product to be detected in the first housing, and making the product to be detected cover the sound hole;
[0014] Recording a first air pressure value in the second shell;
[0015] blowing air into the first shell;
[0016] After a predetermined time, recording a second air pressure value of the second shell;
[0017] The difference between the second air pressure value and the first air pressure value is calculated, and when the difference is greater than a set threshold, it is determined that the product to be detected is leaking.
[0018] Optionally, the predetermined time is 2-5s.
[0019] The air leakage test device of the present invention has a first shell and a second shell respectively arranged on the upper and lower sides of the base plate, and the product to be tested is placed in the first shell. By directly introducing airflow into the first shell, the sensor in the second shell is used to detect the air pressure change in the second shell, so it can be judged very quickly whether the product to be tested is leaking, and the detection efficiency is high. At the same time, the air leakage test device of the present invention does not need to use a leak detector, but uses an ordinary sensor for pressure detection, which effectively reduces the cost.
[0020] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
[0022] Figure 1 is a schematic structural diagram of an air leakage testing device according to an embodiment of the present invention.
[0023] Reference numerals:
[0024] Leakage testing device 100;
[0025] Base plate 10; sound hole 11;
[0026] First shell 20; first cavity 21;
[0027] Second shell 30; second cavity 31;
[0028] Sensor 40;
[0029] Briquetting 50;
[0030] Sealing pad 60;
[0031] Airflow 70;
[0032] Products to be tested 80. DETAILED DESCRIPTION
[0033] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.
[0034] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
[0035] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.
[0036] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.
[0037] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.
[0038] In the specification and claims of the present invention, if the term "first" or "second" is involved, it may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the related objects are in an "or" relationship.
[0039] 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, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.
[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" involved should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0041] The air leakage testing device 100 according to an embodiment of the present invention is described in detail below with reference to the accompanying drawings.
[0042] like Figure 1 As shown, the air leakage testing device 100 according to the embodiment of the present invention includes a substrate 10 , a first shell 20 , a second shell 30 and a sensor 40 .
[0043] Specifically, the substrate 10 is provided with a sound hole 11. The first shell 20 is provided on the first side of the substrate 10, and a first cavity 21 for placing the product 80 to be detected is provided in the first shell 20, and the product 80 to be detected covers the sound hole 11, and the first cavity 21 is used to introduce the airflow 70. The second shell 30 is provided on the second side of the substrate 10, and a second cavity 31 communicating with the sound hole 11 is provided in the second shell 30. The sensor 40 is provided in the second cavity 31 to detect the air pressure in the second cavity 31.
[0044] In other words, the air leakage test device 100 according to the embodiment of the present invention is mainly composed of a substrate 10, a first shell 20, a second shell 30 and a sensor 40. Figure 1As shown, a sound hole 11 is provided on the substrate 10. The first shell 20 is provided on the first side of the substrate 10, and a first cavity 21 is provided in the first shell 20. The first cavity 21 is used to place a product 80 to be tested for air leakage, and the product 80 to be tested is placed in the sealed first cavity 21. The product 80 to be tested is placed at the position of the substrate 10 where the sound hole 11 is provided, ensuring that the product 80 to be tested can cover the sound hole 11. The first cavity 21 can be used to introduce an airflow 70, and the airflow 70 can be compressed air.
[0045] The second housing 30 is disposed on the second side of the substrate 10, and the first side and the second side of the substrate 10 are opposite sides in the thickness direction of the substrate 10. A second cavity 31 communicating with the sound hole 11 is disposed in the second housing 30, and a sealed cavity is formed between the second housing 30 and the substrate 10. The sensor 40 is disposed in the second cavity 31, and the sensor 40 can detect the air pressure in the second cavity 31.
[0046] like Figure 1 As shown, in the actual detection process, the first air pressure value P1 in the second cavity 31 can be detected by the sensor 40, and then the first cavity 21 can be inflated with ordinary compressed air. If there is a leak in the product 80 to be detected, the airflow 70 will be introduced from the first cavity 21 through the product 80 to be detected into the second cavity 31. At this time, the second air pressure value P2 in the second cavity 31 below the product 80 to be detected is recorded. Finally, it can be judged whether there is a leak in the product 80 to be detected based on the difference between the first air pressure value P1 and the second air pressure value P2, and the detection efficiency is high.
[0047] In the present invention, the product to be inspected 80 may be a microphone or other product with a structure composed of a housing and a PCB. The present invention takes the product to be inspected 80 as an example for specific description. There may be two types of air leakage when the microphone is inspected for appearance: one is air leakage from the housing itself (cracks or holes in the housing); the other is air leakage caused by poor welding when the housing and the PCB are soldered using solder paste.
[0048] Therefore, according to the leakage test device 100 of the embodiment of the present invention, the first shell 20 and the second shell 30 are respectively arranged on the upper and lower sides of the substrate 10, and the product 80 to be tested is placed in the first shell 20. By directly introducing the airflow 70 into the first shell 20, the sensor 40 in the second shell 30 is used to detect the air pressure change in the second shell 30, and it can be very quickly determined whether the product 80 to be tested is leaking, and the detection efficiency is high. At the same time, the leakage test device 100 of the present invention does not need to use a leak detector, and uses an ordinary sensor 40 for pressure detection, which effectively reduces the cost.
[0049] According to one embodiment of the present invention, the substrate 10 is a circuit board. Figure 1 As shown, the substrate 10 can be a circuit board, and the first shell 20 and the second shell 30 are respectively arranged on the upper and lower sides of the substrate 10, and the product 80 to be tested is placed in the first shell 20. By directly introducing the airflow 70 into the first shell 20, the sensor 40 in the second shell 30 is used to detect the air pressure change in the second shell 30, and it can be very quickly determined whether the product 80 to be tested is leaking, and the detection efficiency is high. At the same time, the leakage test device 100 of the present invention does not need to use a leak detector, which effectively reduces the cost.
[0050] According to an embodiment of the present invention, the air leakage testing device 100 further includes: a pressing block 50 , which is disposed in the first cavity 21 and is placed on the substrate 10 .
[0051] That is to say, Figure 1 As shown, the air leakage test device 100 further includes a pressing block 50, which is disposed in the first cavity 21 and is placed on the substrate 10. Compared with the design of placing the pressing block 50 on the microphone in the prior art, the present invention places the pressing block 50 directly on the substrate 10, further ensuring a good seal between the substrate 10 (circuit board) and the second housing 30. At the same time, since the pressing block 50 is disposed on the substrate 10 instead of on the microphone, it can effectively prevent the gap between the microphone and the substrate 10 or the gap on the outer shell of the microphone from being pressed by the pressing block 50, thereby effectively avoiding the situation where the microphone leakage cannot be detected.
[0052] According to one embodiment of the present invention, there are a plurality of pressing blocks 50, and the plurality of pressing blocks 50 are arranged on the substrate 10 at intervals. Figure 1 As shown, a plurality of pressing blocks 50 may be used, for example, two pressing blocks 50 may be provided, and the two pressing blocks 50 may be placed on the substrate 10 at intervals, further ensuring a good seal between the substrate 10 (circuit board) and the second housing 30. At the same time, since the pressing block 50 is provided on the substrate 10 instead of on the microphone, it is possible to effectively prevent the gap between the microphone and the substrate 10 or the gap on the housing of the microphone from being pressed by the pressing block 50, thereby effectively preventing the microphone from leaking and being unable to be detected.
[0053] According to one embodiment of the present invention, the orthographic projection area of the first shell 20 on the substrate 10 is greater than the orthographic projection area of the second shell 30 on the substrate 10. Figure 1 As shown, the volume of the first shell 20 is greater than the volume of the second shell 30 , which is beneficial to further improve the detection accuracy of the air leakage testing device 100 .
[0054] According to one embodiment of the present invention, the first housing 20 is sealed and connected to the substrate 10, and the second housing 30 is adhesively connected to the substrate 10. Figure 1 As shown, the first shell 20 and the substrate 10 can be sealed and connected, and the second shell 30 and the substrate 10 can be sealed and connected by bonding, so as to ensure that a closed cavity is formed between the first shell 20 and the substrate 10 and between the second shell 30 and the substrate 10. In the actual detection process, the first air pressure value P1 in the second cavity 31 can be detected by the sensor 40, and then the first cavity 21 can be inflated with ordinary compressed air. If there is a leak in the product 80 to be detected, the airflow 70 will be introduced from the first cavity 21 through the product 80 to be detected into the second cavity 31. At this time, the second air pressure value P2 in the second cavity 31 below the product 80 to be detected is recorded. Finally, according to the difference between the first air pressure value P1 and the second air pressure value P2, it can be judged whether there is a leak in the product 80 to be detected, and the detection efficiency is high.
[0055] According to one embodiment of the present invention, a sealing pad 60 is provided between the second housing 30 and the substrate 10. Figure 1 As shown, a sealing pad 60 can be used to seal the second shell 30 and the substrate 10 to ensure the stability and sealing of the connection between the second shell 30 and the substrate 10. Of course, the second shell 30 and the substrate 10 can also be sealed in other ways, which will not be described in detail in the present invention.
[0056] According to one embodiment of the present invention, the orthographic projection area of the sealing rubber pad 60 on the substrate 10 is larger than the orthographic projection area of the second housing 30 on the substrate 10. Figure 1 As shown, the sealing rubber pad 60 can completely cover the second shell 30, thereby ensuring better sealing between the second shell 30 and the substrate 10 and improving the test accuracy.
[0057] In summary, according to the leakage test device 100 of the embodiment of the present invention, the first shell 20 and the second shell 30 are respectively arranged on the upper and lower sides of the substrate 10, and the product 80 to be tested is placed in the first shell 20. By directly introducing the airflow 70 into the first shell 20, the sensor 40 in the second shell 30 is used to detect the air pressure change in the second shell 30, and it can be judged very quickly whether the product 80 to be tested is leaking, and the detection efficiency is high. At the same time, the leakage test device 100 of the present invention does not need to use a leak detector, and uses an ordinary sensor 40 for pressure detection, which effectively reduces the cost. And by placing the pressing block 50 directly on the substrate 10, the good sealing between the substrate 10 (circuit board) and the second shell 30 is further guaranteed. At the same time, since the pressing block 50 is arranged on the substrate 10 instead of being arranged on the microphone, it can effectively prevent the gap between the microphone and the substrate 10 or the gap on the outer shell of the microphone from being pressed by the pressing block 50, thereby effectively avoiding the situation where the microphone leakage cannot be detected.
[0058] Of course, for those skilled in the art, other structures and working principles of the air leakage testing device 100 are understandable and achievable, and will not be described in detail in the present invention.
[0059] According to a second aspect of the present invention, Figure 1 As shown, a testing method of a leakage testing device 100 is provided, which is used to test whether the product 80 to be tested of the leakage testing device 100 in the above embodiment is leaking. The testing method includes:
[0060] S1, placing the product to be tested 80 in the first housing 20, and making the product to be tested 80 cover the sound hole 11;
[0061] S2, recording the first air pressure value in the second housing 30;
[0062] S3, blowing air into the first shell 20;
[0063] S4, after a predetermined time, recording the second air pressure value of the second housing 30;
[0064] S5. Calculate the difference between the second air pressure value and the first air pressure value. When the difference is greater than a set threshold, determine that the product to be tested 80 is leaking.
[0065] That is to say, Figure 1 As shown, the testing method of the air leakage test device 100 according to the embodiment of the present invention is mainly used to test whether the product 80 to be tested of the air leakage test device 100 in the above embodiment is leaking. In the actual testing method, first, the product 80 to be tested can be placed in the first shell 20, and the product 80 to be tested can cover the sound hole 11. Then, the first air pressure value P1 in the second shell 30 can be recorded by the sensor 40. Next, air can be blown into the first shell 20, for example, ordinary compressed air can be filled into the first shell 20. After a predetermined time, the second air pressure value P2 of the second shell 30 is recorded by the sensor 40. Finally, the difference between the second air pressure value and the first air pressure value is calculated. When the difference is greater than the set threshold, it can be judged that the product 80 to be tested is leaking. The testing method of the air leakage test device 100 of the present invention is simple and easy to operate, and has good detection accuracy and responsiveness.
[0066] According to one embodiment of the present invention, the predetermined time is 2-5 seconds. Figure 1As shown, the test method of the air leakage test device 100 of the present invention can obtain the second pressure value P2 in only 2-5 seconds, for example, 3 seconds, after ordinary compressed air is filled into the first shell 20, and the number of channels is not limited. Compared with the prior art air leakage detection method using a leak detector, the test time of the detector is usually more than 8 seconds, and the channels are all single channels. Therefore, the test method of the air leakage test device 100 of the present invention can greatly improve the efficiency of air leakage testing.
[0067] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.
Claims
1. A gas leakage testing device (100), characterized in that: include: A substrate (10), wherein a sound hole (11) is provided on the substrate (10); a first shell (20), the first shell (20) being arranged on a first side of the substrate (10), the first shell (20) being provided with a first cavity (21) for placing a product to be detected (80), the product to be detected (80) covering the sound hole (11), and the first cavity (21) being used for introducing an airflow (70); A second shell (30), the second shell (30) being arranged on a second side of the substrate (10), and a second cavity (31) communicating with the sound hole (11) being arranged in the second shell (30); A sensor (40), wherein the sensor (40) is disposed in the second cavity (31) to detect the air pressure in the second cavity (31).
2. The air leakage testing device (100) according to claim 1, characterized in that: The substrate (10) is a circuit board.
3. The air leakage testing device (100) according to claim 1, characterized in that: Also includes: A pressing block (50), wherein the pressing block (50) is arranged in the first cavity (21), and the pressing block (50) is placed on the substrate (10).
4. The air leakage testing device (100) according to claim 3, characterized in that: There are a plurality of pressing blocks (50), and the plurality of pressing blocks (50) are arranged on the substrate (10) at intervals.
5. The air leakage testing device (100) according to claim 1, characterized in that: The orthographic projection area of the first shell (20) on the substrate (10) is greater than the orthographic projection area of the second shell (30) on the substrate (10).
6. The air leakage testing device (100) according to claim 1, characterized in that: The first shell (20) is sealedly connected to the substrate (10), and the second shell (30) is adhesively connected to the substrate (10).
7. The air leakage testing device (100) according to claim 1, characterized in that: A sealing rubber pad (60) is provided between the second shell (30) and the substrate (10).
8. The air leakage testing device (100) according to claim 1, characterized in that: The orthographic projection area of the sealing rubber pad (60) on the substrate (10) is larger than the orthographic projection area of the second shell (30) on the substrate (10).
9. A method for testing a leakage test device (100), used for testing whether a product (80) to be tested of the leakage test device (100) as claimed in any one of claims 1 to 8 is leaking, characterized in that: The test method includes: Placing a product to be detected (80) in the first housing (20), and making the product to be detected (80) cover the sound hole (11); Recording a first air pressure value in the second housing (30); Blowing air into the first shell (20); After a predetermined time, recording a second air pressure value of the second shell (30); The difference between the second air pressure value and the first air pressure value is calculated, and when the difference is greater than a set threshold, it is determined that the product to be detected (80) is leaking.
10. The testing method of the air leakage testing device (100) according to claim 9, characterized in that: The predetermined time is 2-5s.