High-precision air tightness detector and detection method thereof

Abstract

The invention discloses a high-precision air tightness detector and a detection method thereof. On one hand, the high-precision air tightness detector comprises a detection clamp used for placing a product to be detected; an air pressure regulator which is connected with a to-be-detected product in the detection fixture to automatically control the internal pressure of the to-be-detected product is arranged outside the detection fixture; the air pressure regulator comprises a box body structure, a vacuum generator is arranged in the box body structure, and the vacuum generator is connected with a to-be-detected product through an air path control valve island structure arranged on the box body structure so as to automatically implement air tightness detection and further safely judge the air tightness of the to-be-detected product. On the other hand, the invention further provides a detection method adopting the high-precision air tightness detector. The air tightness detection device has the advantages that the air tightness of the predetermined electronic product can be accurately judged to ensure the quality of the electronic product, and the quality of the electronic product is not easily damaged in the detection process.

Description

Technical Field

[0001] The present invention relates to the technical field of air tightness detection, and more specifically, to a high-precision air tightness detector and a detection method thereof. Background Art

[0002] With the development of science and technology and the advancement of manufacturing technology, the quality and function of electronic products have attracted more and more attention from consumers. Among them, for electronic products, whether their airtightness is reliable is an important factor reflecting product quality, so the implementation of airtightness testing on electronic products has become an important link in ensuring their product quality.

[0003] At present, in the process of electronic product production, it is common to use water immersion detection method or pressure switch air pressure detection method to implement air tightness detection on electronic products. Although the above methods can meet certain detection needs, they still have the following problems:

[0004] 1. When using the water immersion test method to test the air tightness of electronic products, it is easy to damage the quality of electronic products due to moisture, and it is difficult to apply it to the testing of electronic products on a large scale;

[0005] 2. When using the pressure switch air pressure detection method to implement air tightness detection on electronic products, this detection method mainly uses the pressure switch to identify the leakage pressure based on a fixed pressure setting value to determine the air tightness of the product. In actual detection, since the detection pressure is not a fixed pressure value, but a pressure value with large changes, it is difficult to accurately determine the air tightness of electronic products through pressure switches, and thus the production quality of electronic products cannot be guaranteed, and it is difficult to meet actual application needs.

[0006] How to solve the above problems has become a technical problem that needs to be solved urgently. Summary of the invention

[0007] An object of the present invention is to provide a high-precision airtightness detector that can accurately determine the airtightness of a predetermined electronic product to ensure its quality and is not likely to harm the quality of the electronic product during the detection process.

[0008] Another object of the present invention is to provide a detection method using the above-mentioned high-precision airtightness detector.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0010] On the one hand, the present invention provides a high-precision airtightness tester, comprising a testing fixture for placing a product to be tested; an air pressure regulator is provided on the outside of the testing fixture and is connected to the product to be tested in the testing fixture to automatically control its internal pressure; the air pressure regulator comprises a box structure, a vacuum generator is provided in the box structure and the vacuum generator is connected to the product to be tested via an air path control valve island structure provided on the box structure to automatically implement airtightness testing and thereby safely determine the airtightness of the product to be tested.

[0011] Preferably, the detection fixture includes a base body with supporting foot pads at the bottom, a cavity with a front end opening is provided on the top of the rear side of the base body, a fixture structure for placing an external product to be tested is provided at the lower end inside the cavity, and a limiting structure for confining the fixture structure together with the external product to be tested in the cavity is provided on the cavity, wherein the fixture structure and the limiting structure are both electrically connected to a control structure provided on the base body.

[0012] Preferably, the fixture structure includes a base plate which can be detachably placed at the lower end of the cavity, and a fixed seat for placing the product to be tested is provided on the top side of the base plate, and the product to be tested has an airtight cavity connected to the air path control valve island structure, and a support plate which cooperates with the limiting structure to firmly define the base plate in the cavity is provided on the top of the base plate at the corresponding side of the fixed seat, and also includes an electric push rod which is provided on the support plate away from the fixed seat and electrically connected to the control structure, and the push rod end of the electric push rod passes through the support plate and is connected to a movable plate which is used to clamp and cooperate with the fixed seat to firmly define the product to be tested.

[0013] Preferably, the limiting structure includes a sliding rod arranged on the four ends inside the cavity, and a limiting plate is provided on the sliding rod through a linear bearing, which is used to clamp and cooperate with the support plate to firmly limit the bottom plate in the cavity. It also includes a downward pressure cylinder arranged at the top of the cavity and electrically connected to the control structure, and the push rod end of the downward pressure cylinder extends into the interior of the cavity and is fixedly connected to the limiting plate through a floating joint.

[0014] Preferably, the control structure includes a controller arranged inside the seat body and electrically connected to the electric push rod and the downward pressure cylinder, and also includes a plurality of buttons arranged on the front top of the seat body and electrically connected to the controller for operating the controller to control the operation of the electric push rod and the downward pressure cylinder.

[0015] Preferably, a safety grating electrically connected to the air path control valve island structure is provided at both ends of the front side of the cavity for collecting information of external objects extending into the cavity so as to stop the air tightness detection work through the air path control valve island structure.

[0016] Preferably, the box structure includes a shell with a shock-absorbing foot pad at the bottom and a handle on the top, and a touch screen and a plurality of illuminated buttons are embedded on the front side wall of the shell, wherein the touch screen and the illuminated buttons are electrically connected to the air path control valve island structure arranged on the shell.

[0017] Preferably, the air path control valve island structure includes an integrated circuit chip arranged inside the shell and located at the upper end of the front side of the vacuum generator, and also includes a valve island arranged inside the shell and located below the integrated circuit chip. A gas storage tank is provided in the shell and located on one side of the valve island, and the inlet end of the gas storage tank is connected to a pressure regulating valve embedded in the outer wall of the shell away from the touch screen through a pipeline. The pressure regulating valve is connected to an external air source through an air inlet arranged on the outer wall of the shell close to one end of the pressure regulating valve. A sensor solenoid valve, a pressure sensor, an exhaust solenoid valve, a test solenoid valve, a vacuum solenoid valve, a vacuum generator solenoid valve, a volume solenoid valve and an intake solenoid valve connected to the corresponding ports of the valve island and electrically connected to the integrated circuit chip are also provided on the valve island. The exhaust solenoid valve is connected to an air outlet arranged on the outer wall of the shell close to one end of the air inlet through a pipeline.

[0018] Preferably, the test solenoid valve is airtightly connected to the cavity of the external product to be tested through a pipeline, the air intake solenoid valve is connected to the outlet end of the gas storage tank, the vacuum generator is connected to the vacuum generator solenoid valve through a pipeline, and the safety grating, vacuum generator, touch screen, illuminated button, and valve island are all electrically connected to the integrated circuit chip.

[0019] On the other hand, the present invention also provides a detection method using the high-precision airtightness detector, the detection method comprising the following steps:

[0020] S1. Place the external product to be tested on the designated position of the test fixture and implement position limitation;

[0021] S2. Under the limitation of the box structure of the gas pressure regulator, the corresponding components of the gas path control valve island structure are tightly connected with the cavity of the product to be tested through the pipeline;

[0022] S3. Start the air circuit control valve island structure according to demand to perform air tightness test on the product to be tested, that is, fill the cavity of the product to be tested with a predetermined volume of gas through the air circuit control valve island structure, or extract a predetermined volume of gas in the cavity of the product to be tested through the air circuit control valve island structure, and then let the cavity of the product to be tested implement silent pressure stabilization for a predetermined time. During the pressure stabilization stage, the air circuit control valve island structure monitors the pressure information before and after pressure stabilization in real time and implements data processing, thereby obtaining the pressure deviation value before and after pressure stabilization, that is, the leakage detection value, and then accurately determining the air tightness result of the product to be tested.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] In the present invention, when it is necessary to perform an air-tightness test on an external electronic product with a cavity, that is, a product to be tested, the product to be tested is first placed on a specified position of a testing fixture and position limitation is implemented; under the limitation of the box structure of the air pressure regulator, the corresponding components of the air path control valve island structure are sealed and connected to the cavity of the product to be tested through a pipeline; then, according to the demand, the air path control valve island structure and the vacuum generator are started to perform an air-tightness test on the product to be tested, that is, a predetermined volume of gas is filled into the cavity of the product to be tested through the air path control valve island structure, or a predetermined volume of gas in the cavity of the product to be tested is filled into the cavity of the product to be tested through the cooperation of the air path control valve island structure and the vacuum generator. The gas is extracted, and then the cavity of the product to be tested is subjected to silent pressure stabilization for a predetermined period of time. During the pressure stabilization stage, the pressure information before and after the pressure stabilization is monitored in real time through the gas path control valve island structure and data processing is performed, thereby obtaining the pressure deviation value before and after the pressure stabilization, that is, the leakage detection value, and then accurately determining the airtightness result of the product to be tested. This method can replace the water immersion detection method to perform accurate airtightness detection on electronic products to ensure their factory quality, and is not likely to cause harm to the quality of the electronic products. Therefore, the present invention has the advantages of being able to accurately determine the airtightness of a predetermined electronic product to ensure its quality, and being not likely to harm the quality of the electronic product during the detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a structural schematic diagram of a high-precision air tightness detector according to the present invention;

[0027] Figure 2 It is a circuit connection block diagram of a high-precision airtightness detector described in the present invention;

[0028] Figure 3 It is a flow chart of a detection method of a high-precision air tightness detector described in the present invention.

[0029] Description of the accompanying drawings: 1. Detection fixture, 11. Base body, 12. Cavity, 13. Fixture structure, 131. Bottom plate, 132. Fixed seat, 133. Support plate, 134. Electric push rod, 135. Movable plate, 14. Limiting structure, 141. Sliding rod, 142. Linear bearing, 143. Limiting plate, 144. Pressing cylinder, 145. Floating joint, 15. Control structure, 151. Controller, 152. Button, 16. Support foot pad, 2. Air pressure regulator, 21. Box structure, 211. Shock-absorbing foot pad, 212. Handle, 213. Shell, 214. Touch screen, 215. Illuminated button, 22. Vacuum generator, 23. Air path control valve island structure, 231. Integrated circuit chip, 232. Valve island, 233. Gas tank, 234. Pressure regulating valve, 235. Air inlet, 236. Sensor solenoid valve, 237. Pressure sensor, 238. Exhaust solenoid valve, 239. Test solenoid valve, 240. Vacuum solenoid valve, 241. Vacuum generator solenoid valve, 242. Volume solenoid valve, 243. Air inlet solenoid valve, 244. Air outlet, 3. Safety grating. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] See also Figures 1 to 3As shown, a high-precision air tightness tester includes a test fixture 1 for placing a product to be tested; an air pressure regulator 2 is provided on the outside of the test fixture 1 and is connected to the product to be tested in the test fixture 1 to automatically control its internal pressure; the air pressure regulator 2 includes a box structure 21, a vacuum generator 22 is provided in the box structure 21 and the vacuum generator 22 is connected to the product to be tested through an air path control valve island structure 23 provided on the box structure 21 to automatically implement air tightness testing and then safely determine the air tightness of the product to be tested. During use, when it is necessary to perform air tightness test on an external electronic product with a cavity, that is, a product to be tested, the product to be tested is first placed at a specified position of the testing fixture 1 and the position is limited; under the limitation of the box structure 21 of the air pressure regulator 2, the corresponding components of the air path control valve island structure 23 are tightly connected to the cavity of the product to be tested through a pipeline; then, according to the demand, the air path control valve island structure 23 and the vacuum generator 22 are started to work to perform air tightness test on the product to be tested, that is, a predetermined volume of gas is filled into the cavity of the product to be tested through the air path control valve island structure 23, or a predetermined volume of gas is filled into the cavity of the product to be tested through the air path control valve island structure 23, or a predetermined volume of gas is filled into the cavity of the product to be tested through the air path control valve island structure 22. The control valve island structure 23 cooperates with the vacuum generator 22 to extract a predetermined volume of gas in the cavity of the product to be tested, and then the cavity of the product to be tested is subjected to silent pressure stabilization for a predetermined period of time. During the pressure stabilization stage, the corresponding components of the gas path control valve island structure 23 are used to monitor the pressure information before and after the pressure stabilization in real time and implement data processing, thereby obtaining the pressure deviation value before and after the pressure stabilization, that is, the leakage detection value, and then accurately determining the air tightness result of the product to be tested. This can replace the water immersion detection method to implement accurate air tightness detection on electronic products to ensure their factory quality, and it is not easy to cause harm to the quality of electronic products.

[0032] In this embodiment, the detection fixture 1 includes a base body 11 with a supporting foot pad 16 at the bottom, a cavity 12 with a front end opening is provided on the top of the rear side of the base body 11, a fixture structure 13 for placing an external product to be tested is provided at the lower end of the cavity 12, and a limiting structure 14 for confining the fixture structure 13 together with the external product to be tested in the cavity 12 is provided on the cavity 12, wherein the fixture structure 13 and the limiting structure 14 are both electrically connected to a control structure 15 provided on the base body 11. The fixture structure 13 includes a bottom plate 131 which can be detachably placed at the lower end of the cavity 12, and a fixing seat 132 for placing the product to be tested is provided on one side of the top of the bottom plate 131, and the product to be tested has an airtight cavity connected to the air path control valve island structure 23, and a support plate 133 is provided on the top of the bottom plate 131 at the corresponding side of the fixing seat 132, which cooperates with the limiting structure 14 to firmly limit the bottom plate 131 in the cavity 12, and also includes an electric push rod 134 which is provided on the side of the support plate 133 away from the fixing seat 132 and electrically connected to the control structure 15, and the push rod end of the electric push rod 134 passes through the support plate 133 and is connected to a movable plate 135 which is used to clamp and cooperate with the fixing seat 132 to firmly limit the product to be tested. The limiting structure 14 includes a slide bar 141 disposed at four ends inside the cavity 12, a limiting plate 143 for clamping and cooperating with the support plate 133 to firmly limit the bottom plate 131 in the cavity 12 is disposed on the slide bar 141 through a linear bearing 142, and also includes a downward-pressing cylinder 144 disposed at the top of the cavity 12 and electrically connected to the control structure 15, and the push rod end of the downward-pressing cylinder 144 extends into the cavity 12 and is fixedly connected to the limiting plate 143 through a floating joint 145. The control structure 15 includes a controller 151 disposed inside the seat body 11 and electrically connected to the electric push rod 134 and the downward-pressing cylinder 144, and also includes a plurality of buttons 152 disposed at the top of the front side of the seat body 11 and electrically connected to the controller 151 for operating the controller 151 to control the operation of the electric push rod 134 and the downward-pressing cylinder 144.During use, when it is necessary to perform air tightness testing on an external electronic product with a cavity, that is, a product to be tested, the testing fixture 1 is moved to a designated location by moving the seat body 11 and placed on a predetermined position through the supporting foot pad 16, and the air pressure regulator 2 is moved to a designated location by grabbing the handle 212 of the box structure 21 and placed on a predetermined position through the shock-absorbing foot pad 211. Under the limitation of the bottom plate 131, the product to be tested is placed on the fixed seat 132 of the fixture structure 13, and then the corresponding button 152 of the control structure 15 is activated to transmit a signal to the controller 151 to start the operation of the electric push rod 134. The controller 151 starts the operation of the electric push rod 134, and under the limitation of the support plate 133, the push rod end of the electric push rod 134 is used to drive The movable plate 135 moves toward the fixed seat 132, so that the product to be tested is firmly confined on the fixed seat 132 by the mutual clamping cooperation between the fixed seat 132 and the movable plate 135, and then the corresponding button 152 of the control structure 15 is started to transmit a signal to the controller 151 to start the operation of the pressing cylinder 144 of the limiting structure 14, and the controller 151 starts the operation of the pressing cylinder 14. Under the limitation of the sliding rod 141, the linear bearing 142, the floating joint 145 and the limiting plate 143 are pressed down toward the support plate 133 through the push rod end of the pressing cylinder 14, and move until the limiting plate 143 and the support plate 133 are pressed against each other to firmly confine the fixture structure 13 together with the product to be tested on the cavity 12, thereby effectively improving the convenience and safety of use.

[0033] In this embodiment, a safety grating 3 is provided at both ends of the front side of the cavity 12, which is electrically connected to the gas path control valve island structure 23 and is used to collect information about external objects extending into the cavity 12 so as to stop the air tightness detection work through the gas path control valve island structure 23. During use, the safety grating 3 collects information about external objects extending into the cavity 12 in real time and synchronously transmits it to the integrated circuit chip 231 of the gas path control valve island structure 23 for data processing, and then stops the air tightness detection work of the product to be tested through the integrated circuit chip 231, thereby effectively avoiding the interference of human factors when performing air tightness detection on the product to be tested, which affects the detection effect and causes harm to the human body.

[0034] In this embodiment, the box structure 21 includes a shell 213 with a shock-absorbing foot pad 211 at the bottom and a handle 212 at the top. A touch screen 214 and a plurality of lighted buttons 215 are embedded on the front side wall of the shell 213, wherein the touch screen 214 and the lighted buttons 215 are electrically connected to the gas path control valve island structure 23 provided on the shell 213. The gas path control valve island structure 23 includes an integrated circuit chip 231 provided inside the shell 213 and located at the upper end of the front side of the vacuum generator 22, and also includes a valve island 232 provided inside the shell 213 and located below the integrated circuit chip 231. A gas storage tank 233 is provided inside the shell 213 and located on one side of the valve island 232, and the inlet end of the gas storage tank 233 is connected to a pressure regulating valve 234 embedded on the outer wall of the shell 213 away from the touch screen 214 through a pipeline. The pressure regulating valve 234 is connected to the outer wall of the shell 213 via a pressure regulating valve 234 provided on the outer wall of the shell 213. An air inlet 235 near one end of the pressure regulating valve 234 is connected to an external air source. A sensor solenoid valve 236, a pressure sensor 237, an exhaust solenoid valve 238, a test solenoid valve 239, a vacuum solenoid valve 240, a vacuum generator solenoid valve 241, a volume solenoid valve 242 and an air intake solenoid valve 243 are provided on the valve island 232, which are connected to the corresponding port of the valve island 232 and electrically connected to the integrated circuit chip 231. The exhaust solenoid valve 238 is connected to an air outlet 244 arranged on the outer wall of the shell 213 near one end of the air inlet 235 through a pipeline. The test solenoid valve 239 is tightly connected to the cavity of the external product to be tested through a pipeline, the air inlet solenoid valve 243 is connected to the outlet end of the gas storage tank 233, the vacuum generator 22 is connected to the vacuum generator solenoid valve 241 through a pipeline, and the safety grating 3, vacuum generator 22, touch screen 214, lighted button 215, and valve island 232 are all electrically connected to the integrated circuit chip 231. During use, under the limitation of the shell 213 of the box structure 21 of the air pressure regulator 2, the test solenoid valve 239 of the air path control valve island structure 23 is tightly connected to the cavity of the product to be tested through a pipeline;Then, according to the demand, the lighted button 215 is pressed to transmit the test working signal to the integrated circuit chip 231, and the integrated circuit chip 231 starts the touch screen 214, the valve island 232, the sensor solenoid valve 236, the pressure sensor 237, the exhaust solenoid valve 238, the test solenoid valve 239, the vacuum solenoid valve 240, the vacuum generator solenoid valve 241, the volume solenoid valve 242, the intake solenoid valve 243, and the vacuum generator 22 to work. Then, according to the demand, the predetermined detection mode is selected by controlling the touch screen 214 to perform air tightness detection on the product to be tested. That is, when the direct detection test mode is adopted, the direct detection test mode is selected by controlling the touch screen 214, and after the intake air is adjusted to an appropriate intake pressure through the pressure regulating valve 234, a predetermined volume of external gas source is sequentially introduced through the corresponding cavities of the intake port 235, the gas storage tank 233, the intake solenoid valve 243, and the valve island 232. , the test solenoid valve 239 is directly filled into the cavity of the product to be tested, and then the cavity of the product to be tested is allowed to perform silent pressure stabilization within a predetermined time. During the pressure stabilization stage, the sensor solenoid valve 236 is maintained in an open state. At this time, the gas in the cavity of the product to be tested enters the pressure sensor 237, and the pressure sensor 237 monitors the pressure information before and after the pressure stabilization in real time and transmits it to the integrated circuit chip 231 for data processing, thereby obtaining the pressure deviation value before and after the pressure stabilization, that is, the leakage value, and transmitting it to the touch screen 214 for synchronous display so that the test personnel can accurately determine the airtightness result of the product to be tested. After the test is completed, the integrated circuit chip 231 starts the exhaust solenoid valve 238 to discharge the gas in the cavity of the product to be tested to the external environment through the corresponding cavity of the valve island 232, the exhaust solenoid valve 238, and the air outlet 244 in turn, and the airtightness test in this mode can be completed;When the volume detection test mode is adopted, the volume detection test mode is selected by operating the touch screen 214. At this time, the integrated circuit chip 231 controls the air intake solenoid valve 243 and the volume solenoid valve 242 to be in the disconnected state. After the air intake is adjusted to an appropriate air intake pressure by the pressure regulating valve 234, the external air source enters the air storage tank 233 through the air inlet 235 in turn to implement volume inflation. After the volume inflation time is over, the integrated circuit chip 231 closes the external inflation solenoid valve to stop the air intake, and opens the air intake solenoid valve 243 and the volume solenoid valve 242 at the same time. The gas in the air storage tank 233 is filled into the cavity of the product to be tested through the air intake solenoid valve 243, the corresponding cavity of the valve island 232, and the test solenoid valve 239 in turn. Then the volume solenoid valve 242 is closed to allow the cavity of the product to be tested to be filled. The gas performs silent pressure stabilization within a predetermined time. During the pressure stabilization stage, the sensor solenoid valve 236 is maintained in an open state. At this time, the gas in the cavity of the product to be tested enters the pressure sensor 237. The pressure sensor 237 monitors the pressure information before and after the pressure stabilization in real time and transmits it to the integrated circuit chip 231 for data processing, thereby obtaining the pressure deviation value before and after the pressure stabilization, that is, the leakage value, and transmitting it to the touch screen 214 for synchronous display so that the test personnel can accurately determine the air tightness result of the product to be tested. After the test is completed, the integrated circuit chip 231 starts the exhaust solenoid valve 238 to discharge the gas in the cavity of the product to be tested to the external environment through the corresponding cavity of the valve island 232, the exhaust solenoid valve 238, and the air outlet 244 in turn, and the air tightness test in this mode can be completed;When the negative pressure detection test mode is adopted, the negative pressure detection test mode is selected by operating the touch screen 214. At this time, the integrated circuit chip 231 controls the air intake solenoid valve 243 and the volume solenoid valve 242 to be in the disconnected state, the vacuum solenoid valve 240 and the vacuum generator solenoid valve 241 to be in the open state, and the vacuum generator 22 is started to work, and the gas in the cavity of the product to be tested is successively drawn into the vacuum generator 22 through the test solenoid valve 239, the corresponding cavity of the valve island 232, the vacuum solenoid valve 240, and the vacuum generator solenoid valve 241, so that negative pressure is formed in the cavity of the product to be tested. Then, the integrated circuit chip 231 closes the vacuum solenoid valve 240 and the vacuum generator solenoid valve 241, so that the cavity of the product to be tested performs a silent pressure stabilization operation within a predetermined time. During the pressure stabilization stage, the sensor solenoid valve 236 is maintained in the open state. state, at this time, the cavity of the product to be tested is connected to the pressure sensor 237, and the pressure sensor 237 monitors the pressure information before and after voltage stabilization in real time and transmits it to the integrated circuit chip 231 for data processing, thereby obtaining the pressure deviation value before and after voltage stabilization, that is, the leakage detection value, and transmitting it to the touch screen 214 for synchronous display so that the test personnel can accurately determine the airtightness result of the product to be tested. After the test is completed, the integrated circuit chip 231 starts the exhaust solenoid valve 238 to discharge the gas in the cavity of the product to be tested to the external environment through the corresponding cavity of the valve island 232, the exhaust solenoid valve 238, and the outlet 244 in sequence to complete the airtightness test in this mode. The above method can replace the immersion test method to perform accurate airtightness test on electronic products to ensure their factory quality, and it is not easy to cause harm to the quality of electronic products. ;

[0035] When the present embodiment is used specifically, first, when it is necessary to perform air tightness test on an external electronic product with a cavity, that is, a product to be tested, the test fixture 1 is moved to a designated place by moving the seat body 11 and placed at a predetermined position by the supporting foot pad 16, and the air pressure regulator 2 is moved to a designated place by grabbing the handle 212 of the box structure 21 and placed at a predetermined position by the shock-absorbing foot pad 211. Under the limitation of the bottom plate 131, the product to be tested is placed on the fixed seat 132 of the fixture structure 13, and then the corresponding button 152 of the control structure 15 is started to transmit a signal to the controller 151 to start the operation of the electric push rod 134, and the controller 151 starts the operation of the electric push rod 134. Under the limitation of the support plate 133, the push rod end of the electric push rod 134 is used to drive the movable plate 135 to move toward the fixed seat 132, thereby using the fixed seat 132 and the movable plate 1 35 are mutually clamped and matched to firmly limit the product to be tested on the fixing seat 132; secondly, the corresponding button 152 of the start control structure 15 transmits a signal to the controller 151 to start the operation of the pressing cylinder 144 of the limiting structure 14, and the controller 151 starts the operation of the pressing cylinder 14. Under the limitation of the slide bar 141, the linear bearing 142, together with the floating joint 145 and the limiting plate 143, is driven by the push rod end of the pressing cylinder 14 to be pressed down toward the support plate 133 for movement, until the limiting plate 143 and the supporting plate 133 are pressed against each other to firmly limit the fixture structure 13 together with the product to be tested on the cavity 12, thereby effectively improving the convenience and safety of use; then, under the limitation of the shell 213 of the box structure 21 of the air pressure regulator 2, the test solenoid valve 239 of the air path control valve island structure 23 is sealed and connected with the cavity of the product to be tested through a pipeline;Then, according to the demand, the lighted button 215 is pressed to transmit the test working signal to the integrated circuit chip 231, and the integrated circuit chip 231 starts the touch screen 214, the valve island 232, the sensor solenoid valve 236, the pressure sensor 237, the exhaust solenoid valve 238, the test solenoid valve 239, the vacuum solenoid valve 240, the vacuum generator solenoid valve 241, the volume solenoid valve 242, the intake solenoid valve 243, and the vacuum generator 22 to work. Then, according to the demand, the predetermined detection mode is selected by controlling the touch screen 214 to perform air tightness detection on the product to be tested. That is, when the direct detection test mode is adopted, the direct detection test mode is selected by controlling the touch screen 214, and after the intake air is adjusted to an appropriate intake pressure through the pressure regulating valve 234, a predetermined volume of external gas source is sequentially introduced through the corresponding cavities of the intake port 235, the gas storage tank 233, the intake solenoid valve 243, and the valve island 232. , the test solenoid valve 239 is directly filled into the cavity of the product to be tested, and then the cavity of the product to be tested is allowed to perform silent pressure stabilization within a predetermined time. During the pressure stabilization stage, the sensor solenoid valve 236 is maintained in an open state. At this time, the gas in the cavity of the product to be tested enters the pressure sensor 237, and the pressure sensor 237 monitors the pressure information before and after the pressure stabilization in real time and transmits it to the integrated circuit chip 231 for data processing, thereby obtaining the pressure deviation value before and after the pressure stabilization, that is, the leakage value, and transmitting it to the touch screen 214 for synchronous display so that the test personnel can accurately determine the airtightness result of the product to be tested. After the test is completed, the integrated circuit chip 231 starts the exhaust solenoid valve 238 to discharge the gas in the cavity of the product to be tested to the external environment through the corresponding cavity of the valve island 232, the exhaust solenoid valve 238, and the air outlet 244 in turn, and the airtightness test in this mode can be completed;When the volume detection test mode is adopted, the volume detection test mode is selected by operating the touch screen 214. At this time, the integrated circuit chip 231 controls the air intake solenoid valve 243 and the volume solenoid valve 242 to be in the disconnected state. After the air intake is adjusted to an appropriate air intake pressure by the pressure regulating valve 234, the external air source enters the air storage tank 233 through the air inlet 235 in turn to implement volume inflation. After the volume inflation time is over, the integrated circuit chip 231 closes the external inflation solenoid valve to stop the air intake, and opens the air intake solenoid valve 243 and the volume solenoid valve 242 at the same time. The gas in the air storage tank 233 is filled into the cavity of the product to be tested through the air intake solenoid valve 243, the corresponding cavity of the valve island 232, and the test solenoid valve 239 in turn. Then the volume solenoid valve 242 is closed to allow the cavity of the product to be tested to be filled. The gas performs silent pressure stabilization within a predetermined time. During the pressure stabilization stage, the sensor solenoid valve 236 is maintained in an open state. At this time, the gas in the cavity of the product to be tested enters the pressure sensor 237. The pressure sensor 237 monitors the pressure information before and after the pressure stabilization in real time and transmits it to the integrated circuit chip 231 for data processing, thereby obtaining the pressure deviation value before and after the pressure stabilization, that is, the leakage value, and transmitting it to the touch screen 214 for synchronous display so that the test personnel can accurately determine the air tightness result of the product to be tested. After the test is completed, the integrated circuit chip 231 starts the exhaust solenoid valve 238 to discharge the gas in the cavity of the product to be tested to the external environment through the corresponding cavity of the valve island 232, the exhaust solenoid valve 238, and the air outlet 244 in turn, and the air tightness test in this mode can be completed;When the negative pressure detection test mode is adopted, the negative pressure detection test mode is selected by operating the touch screen 214. At this time, the integrated circuit chip 231 controls the air intake solenoid valve 243 and the volume solenoid valve 242 to be in the disconnected state, the vacuum solenoid valve 240 and the vacuum generator solenoid valve 241 to be in the open state, and at the same time, the vacuum generator 22 is started to work, and the gas in the cavity of the product to be tested is successively pumped into the vacuum generator 22 through the test solenoid valve 239, the corresponding cavity of the valve island 232, the vacuum solenoid valve 240, and the vacuum generator solenoid valve 241, so that negative pressure is formed in the cavity of the product to be tested. Then, the vacuum solenoid valve 240 and the vacuum generator solenoid valve 241 are closed by the integrated circuit chip 231, so that the cavity of the product to be tested performs silent pressure stabilization within a predetermined time. During the pressure stabilization stage, the sensor solenoid valve 236 is maintained in the open state. At this time, the cavity of the product to be tested is connected with the pressure sensor 237, and the pressure sensor 237 monitors the pressure information before and after the pressure stabilization in real time and transmits it to the integrated circuit chip 231 for data processing. Thus, the pressure deviation value before and after voltage stabilization, i.e., the leakage value, is obtained and transmitted to the touch screen 214 for synchronous display so that the test personnel can accurately determine the air tightness result of the product to be tested. After the test is completed, the integrated circuit chip 231 starts the exhaust solenoid valve 238 to discharge the gas in the cavity of the product to be tested to the external environment through the corresponding cavity of the valve island 232, the exhaust solenoid valve 238, and the air outlet 244 in sequence, and the air tightness test in this mode can be completed. The above method can replace the water immersion test method to accurately test the air tightness of electronic products to ensure their factory quality, and it is not easy to cause harm to the quality of electronic products; finally, the safety grating 3 collects the information of the external object extending into the cavity 12 in real time and transmits it synchronously to the integrated circuit chip 231 of the gas path control valve island structure 23 for data processing, and then stops the air tightness test of the product to be tested through the integrated circuit chip 231, thereby effectively avoiding the interference of human factors when performing air tightness test on the product to be tested, which affects the test effect and causes harm to the human body. ;

[0036] In this embodiment, a detection method using the high-precision airtightness detector is also provided, and the detection method comprises the following steps:

[0037] S1, placing the external product to be tested on the designated position of the testing fixture 1 and implementing position limitation;

[0038] S2. Under the limitation of the box structure 21 of the gas pressure regulator 2, the corresponding components of the gas circuit control valve island structure 23 are tightly connected to the cavity of the product to be tested through the pipeline;

[0039] S3. Start the air circuit control valve island structure 23 as required to perform air tightness test on the product to be tested, i.e., fill the cavity of the product to be tested with a predetermined volume of gas through the air circuit control valve island structure 23, or extract a predetermined volume of gas in the cavity of the product to be tested through the air circuit control valve island structure 23, and then let the cavity of the product to be tested perform silent pressure stabilization for a predetermined time. During the pressure stabilization stage, the pressure information before and after pressure stabilization is monitored in real time through the air circuit control valve island structure 23 and data processing is performed, thereby obtaining the pressure deviation value before and after pressure stabilization, i.e. the leakage detection value, and then accurately determining the air tightness result of the product to be tested.

[0040] In summary, the present invention adopts the above structure, which has the advantages of being able to accurately determine the airtightness of a predetermined electronic product to ensure its quality, and not easily endangering the quality of the electronic product during the detection process.

[0041] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims

1. A high-precision airtightness tester, comprising a test fixture (1) for placing a product to be tested; characterized in that: An air pressure regulator (2) is provided outside the detection fixture (1) and is connected to the product to be tested in the detection fixture (1) to automatically control the internal pressure thereof; the air pressure regulator (2) comprises a box structure (21), a vacuum generator (22) is provided in the box structure (21), and the vacuum generator (22) is connected to the product to be tested via an air path control valve island structure (23) provided on the box structure (21) to automatically perform air tightness testing and thereby safely determine the air tightness of the product to be tested.

2. The high-precision airtightness detector according to claim 1, characterized in that: The detection fixture (1) comprises a base (11) with a supporting foot pad (16) at the bottom, a cavity (12) with a front end opening is provided at the top of the rear side of the base (11), a fixture structure (13) for placing an external product to be tested is provided at the lower end of the cavity (12), and a limiting structure (14) is provided on the cavity (12) for limiting the fixture structure (13) together with the external product to be tested in the cavity (12), wherein the fixture structure (13) and the limiting structure (14) are both electrically connected to a control structure (15) provided on the base (11).

3. The high-precision airtightness detector according to claim 2, characterized in that: The clamp structure (13) comprises a bottom plate (131) which is detachably placed at the lower end of the cavity (12); a fixing seat (132) for placing the product to be tested is provided on one side of the top of the bottom plate (131); and the product to be tested has an airtight cavity connected to the air path control valve island structure (23); a support plate (133) is provided on the top of the bottom plate (131) at the corresponding side of the fixing seat (132) and cooperates with the limiting structure (14) to firmly limit the bottom plate (131) in the cavity (12); and an electric push rod (134) is provided on the side of the support plate (133) away from the fixing seat (132) and electrically connected to the control structure (15); and the push rod end of the electric push rod (134) passes through the support plate (133) and is connected to a movable plate (135) for clamping and cooperating with the fixing seat (132) to firmly limit the product to be tested.

4. The high-precision airtightness detector according to claim 3, characterized in that: The limiting structure (14) includes a sliding rod (141) arranged on the four ends inside the cavity (12), and a limiting plate (143) is provided on the sliding rod (141) through a linear bearing (142) for clamping and cooperating with the support plate (133) to firmly limit the bottom plate (131) in the cavity (12). It also includes a downward pressure cylinder (144) arranged at the top of the cavity (12) and electrically connected to the control structure (15), and the push rod end of the downward pressure cylinder (144) extends into the interior of the cavity (12) and is fixedly connected to the limiting plate (143) through a floating joint (145).

5. The high-precision airtightness detector according to claim 4, characterized in that: The control structure (15) includes a controller (151) arranged inside the seat body (11) and electrically connected to the electric push rod (134) and the downward pressure cylinder (144), and also includes a plurality of buttons (152) arranged on the front top of the seat body (11) and electrically connected to the controller (151) for operating the controller (151) to control the operation of the electric push rod (134) and the downward pressure cylinder (144).

6. The high-precision airtightness detector according to claim 3, characterized in that: A safety grating (3) is provided at both ends of the front side of the cavity (12) and is electrically connected to the air path control valve island structure (23) for collecting information about an external object extending into the cavity (12) so as to stop the air tightness detection work through the air path control valve island structure (23).

7. The high-precision airtightness detector according to claim 6, characterized in that: The box structure (21) comprises a shell (213) with a shock-absorbing foot pad (211) at the bottom and a handle (212) at the top, and a touch screen (214) and a plurality of lighted buttons (215) are embedded on the front side wall of the shell (213), wherein the touch screen (214) and the lighted buttons (215) are both electrically connected to a gas path control valve island structure (23) provided on the shell (213).

8. The high-precision airtightness detector according to claim 7, characterized in that: The air path control valve island structure (23) comprises an integrated circuit chip (231) arranged inside the shell (213) and located at the upper end of the front side of the vacuum generator (22), and also comprises a valve island (232) arranged inside the shell (213) and located below the integrated circuit chip (231); a gas storage tank (233) is provided inside the shell (213) and located on one side of the valve island (232); and the inlet end of the gas storage tank (233) is connected to a pressure regulating valve (234) embedded in the outer wall of the shell (213) away from the touch screen (214) through a pipeline; the pressure regulating valve (234) is connected to the outer wall of the shell (213) by a pressure regulating valve (234) provided close to the touch screen (214). An air inlet (235) near one end of the pressure regulating valve (234) is connected to an external air source. A sensor solenoid valve (236), a pressure sensor (237), an exhaust solenoid valve (238), a test solenoid valve (239), a vacuum solenoid valve (240), a vacuum generator solenoid valve (241), a volume solenoid valve (242) and an air inlet solenoid valve (243) are also provided on the valve island (232), which are connected to the corresponding port of the valve island (232) and electrically connected to the integrated circuit chip (231). The exhaust solenoid valve (238) is connected to an air outlet (244) provided on the outer wall of the shell (213) near one end of the air inlet (235) through a pipeline.

9. The high-precision airtightness detector according to claim 8, characterized in that: The test solenoid valve (239) is hermetically connected to the cavity of the external product to be tested via a pipeline, the air intake solenoid valve (243) is connected to the outlet end of the gas storage tank (233), the vacuum generator (22) is connected to the vacuum generator solenoid valve (241) via a pipeline, and the safety grating (3), the vacuum generator (22), the touch screen (214), the lighted button (215), and the valve island (232) are all electrically connected to the integrated circuit chip (231).

10. A detection method using the high-precision airtightness detector according to claim 1, characterized in that: The detection method comprises the following steps: S1, placing the external product to be tested at a designated position of the testing fixture (1) and implementing position limitation; S2. Under the limitation of the box structure (21) of the air pressure regulator (2), the corresponding components of the air path control valve island structure (23) are tightly connected to the cavity of the product to be tested through a pipeline; S3. The air circuit control valve island structure (23) is started to perform air tightness test on the product to be tested according to demand, i.e., a predetermined volume of gas is filled into the cavity of the product to be tested through the air circuit control valve island structure (23), or a predetermined volume of gas in the cavity of the product to be tested is extracted through the air circuit control valve island structure (23), and then the cavity of the product to be tested is subjected to silent pressure stabilization for a predetermined period of time. During the pressure stabilization stage, the pressure information before and after pressure stabilization is monitored in real time through the air circuit control valve island structure (23) and data processing is performed, thereby obtaining the pressure deviation value before and after pressure stabilization, i.e., the leakage detection value, and then accurately determining the air tightness result of the product to be tested.

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