CN112197918A - Air tightness detection system and method - Google Patents
Air tightness detection system and method Download PDFInfo
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- CN112197918A CN112197918A CN202011142585.2A CN202011142585A CN112197918A CN 112197918 A CN112197918 A CN 112197918A CN 202011142585 A CN202011142585 A CN 202011142585A CN 112197918 A CN112197918 A CN 112197918A
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3281—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators removably mounted in a test cell
- G01M3/329—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators removably mounted in a test cell for verifying the internal pressure of closed containers
Abstract
The application discloses gas tightness detecting system. The method comprises the following steps: the device comprises a pressurization module, a sensing module and a judgment module; the method comprises the steps that a supercharging module obtains a supercharging direction, a supercharging amplitude and supercharging time in a supercharging process; the sensing module acquires sensing data, and the sensing data is obtained by sensing one of the following physical quantities: the air pressure inside the device to be tested, the air pressure difference between the outside and the inside of the device to be tested and the elastic deformation of the shell for isolating the outside from the inside of the device to be tested are adopted; and under the conditions of the pressurization direction, the pressurization amplitude and the pressurization time, the judgment module judges the air tightness detection result according to the change of the sensing data. The technical scheme provided by the application can judge the detection result according to the numerical value and cannot damage equipment due to water leakage; special inflation interfaces, cavities and clamps do not need to be reserved or customized; the measurement component with lower range and lower precision can meet the detection requirement; allowing different external pressures to be applied to simulate the scene of the actual application.
Description
Technical Field
The application relates to the field of air tightness detection, in particular to an air tightness detection system and method of waterproof and dustproof equipment.
Background
The equipment with high waterproof and dustproof requirements usually needs to be subjected to air tightness detection before leaving a factory. Some devices, such as waterproof camera cases, waterproof cameras or waterproof mobile phones for underwater photography, may have an effect on waterproof performance after being used or placed for a certain period of time due to aging and failure of waterproof components, and in order to ensure safety in use, it is even necessary to perform air tightness detection on the devices before each use.
The existing air tightness detection technical scheme mainly comprises three types: firstly, a device to be tested is immersed in water, and the auxiliary means is as follows: pressurizing before the equipment to be tested is immersed in water, or pressurizing after the equipment to be tested is immersed in water; and observing whether bubbles appear in the shell of the equipment to be detected or whether water enters the shell of the equipment to be detected so as to judge the detection result. The problems with this solution are: only the experience judgment can be relied on, and the accuracy and the reliability are poor; the electronic devices inside the apparatus may be damaged due to the water leakage. Secondly, inflating or exhausting air into the equipment to be detected, and detecting the pressure value inside the equipment to be detected; and judging the detection result according to the pressure change condition inside the equipment to be detected. The problems with this solution are: requiring the equipment to be tested to be provided with an inflation interface, and if the inflation interface is not available, customizing a special inflation interface or a clamp; the use scene that the internal pressure difference exceeds one atmosphere from the outside cannot be simulated. Thirdly, placing the equipment to be tested in the cavity, inflating or exhausting air to the cavity, and detecting the pressure outside the equipment to be tested; and judging the detection result according to the external pressure change condition of the equipment to be detected. The problems of the scheme are as follows: a cavity or a clamp which is close to the overall dimension of the equipment to be tested needs to be customized; the measuring component has higher requirements on measuring range and precision.
Disclosure of Invention
The invention provides an air tightness detection system and method and a device for detecting air tightness by matching with the air tightness detection system, which solve the problems in the existing air tightness detection technical scheme.
In a first aspect, the present application discloses an air-tightness detection system, comprising: the device comprises a pressurization module, a sensing module and a judgment module; the method comprises the following steps that a pressurizing module obtains a pressurizing direction, a pressurizing amplitude and a pressurizing time of a pressurizing process, the pressurizing process is a process that a system or a device matched with the system for air tightness detection exerts an action, so that the air pressure outside a device to be detected is subjected to controlled change, and the pressurizing direction, the pressurizing amplitude and the pressurizing time are the direction, the amplitude and the time of the controlled change; the sensing module acquires sensing data, and the sensing data is obtained by sensing one of the following physical quantities: the air pressure inside the device to be tested, the air pressure difference between the outside and the inside of the device to be tested and the elastic deformation of the shell for isolating the outside from the inside of the device to be tested are adopted; and under the conditions of the pressurization direction, the pressurization amplitude and the pressurization time, the judgment module judges the air tightness detection result according to the change of the sensing data.
Further, still include: a communication module; the communication module receives the sensed data.
Further, the physical quantity is air pressure inside the device to be tested; during the pressurization time, the discrimination module indicates failure of the airtightness detection if the following conditions are satisfied: the sensing data change direction follows the supercharging direction, and the ratio of the sensing data change amplitude to the supercharging amplitude is larger than a threshold value.
Further, still include: an absolute pressure type pressure sensor; the vent hole of the absolute pressure type pressure sensor is communicated with the interior of the device to be tested; the absolute pressure type pressure sensor senses the air pressure inside the device to be tested to obtain sensing data.
Further, the physical quantity is the air pressure difference between the outside and the inside of the device to be tested or the elastic deformation of a shell for isolating the outside and the inside of the device to be tested; during the pressurization time, the discrimination module indicates failure of the air-tightness detection if one of the following conditions is satisfied: the sensing data does not follow the supercharging direction change; the rate of decrease in the sensed data over a period of time following the boost direction change reaching a peak is greater than the threshold.
Further, still include: a differential pressure type pressure sensor; a first vent hole of the differential pressure type pressure sensor is communicated with the outside of the device to be tested, and a second vent hole of the differential pressure type pressure sensor is communicated with the inside of the device to be tested; the differential pressure type pressure sensor senses the air pressure difference between the outside and the inside of the device to be tested to obtain sensing data.
Further, still include: a resistance strain gauge; the shell is provided with an induction area, and the resistance type strain gauge is pasted on the inner wall or the outer wall of the induction area; the resistance strain gauge senses elastic deformation of the shell which isolates the outside from the inside of the device to be tested to obtain sensing data.
Further, the structure of the sensing region has at least one of the following differences with respect to the periphery: the thickness is different, and the material is different, has protruding structure, has the sunk structure.
Further, still include: a pressurizing cavity and a pneumatic device; the pressurizing cavity is used for accommodating a device to be tested; the pneumatic device is communicated with the pressurizing cavity; the pneumatic device inflates or evacuates the pressurizing cavity according to the pressurizing direction until the variation amplitude of the air pressure in the pressurizing cavity reaches the pressurizing amplitude, and then the pressurizing time is kept.
Further, still include: setting a module; the setting module sets the supercharging direction, the supercharging amplitude and the supercharging time in a scene selection mode.
In a second aspect, the present application further discloses a device for detecting air tightness in cooperation with an air tightness detection system, which is characterized by comprising: a sensor module and a communication module; the sensor module senses one of the following physical quantities to obtain sensing data: the air pressure inside the device, the air pressure difference between the outside of the device and the inside of the device, and the elastic deformation of a shell for isolating the outside from the inside of the device; the communication module transmits the sensed data to the system of claim 2.
Further, still include: a metal contact exposed on the device; the communication module is connected with the metal contact; the communication module transmits the sensing data through the metal contact.
Further, the sensor module is provided with an absolute pressure type pressure sensor; the vent hole of the absolute pressure type pressure sensor is communicated with the inside of the device; the air pressure inside the absolute pressure type pressure sensor sensing device obtains sensing data.
Further, the sensor module is provided with a differential pressure type pressure sensor; a first vent hole of the differential pressure type pressure sensor is communicated with the outside of the device, and a second vent hole of the differential pressure type pressure sensor is communicated with the inside of the device; the differential pressure type pressure sensor senses the air pressure difference between the outside and the inside of the device to obtain sensing data.
Further, the sensor module is provided with a resistance type strain gauge; the shell is provided with an induction area, and the resistance type strain gauge is pasted on the inner wall or the outer wall of the induction area; the resistance type strain gauge sensing device isolates the elastic deformation of the shell inside and outside to obtain sensing data.
Further, the structure of the sensing region has at least one of the following differences with respect to the periphery: the thickness is different, and the material is different, has protruding structure, has the sunk structure.
In a third aspect, the present application further discloses a device for performing air tightness detection in cooperation with an air tightness detection system, which is characterized by comprising: a pressurizing cavity and a pneumatic device; the pressurizing cavity is used for accommodating a device to be tested; the pneumatic device is communicated with the pressurizing cavity; the pneumatic device inflates or evacuates the pressurizing cavity according to the preset pressurizing direction until the change amplitude of the air pressure in the pressurizing cavity reaches the preset pressurizing amplitude, and then the preset pressurizing time is kept.
Further, still include: setting a module; the setting module sets the supercharging direction, the supercharging amplitude and the supercharging time in a scene selection mode.
In a fourth aspect, the present application further discloses an air tightness detection method, including: exerting an action to enable the external air pressure of the device to be tested to be controlled and changed, and recording the direction, the amplitude and the time of the controlled change as the supercharging direction, the supercharging amplitude and the supercharging time; sensing data by sensing one of the following physical quantities: the air pressure inside the device to be tested, the air pressure difference between the outside and the inside of the device to be tested and the elastic deformation of the shell for isolating the outside from the inside of the device to be tested are adopted; and judging the air tightness detection result according to the change of the sensing data under the pressurization direction, the pressurization amplitude and the pressurization time.
Further, still include: the physical quantity is the air pressure in the device to be measured; during the pressurization time, failure of the detection of tightness is indicated if the following conditions are satisfied: the sensing data change direction follows the supercharging direction, and the ratio of the sensing data change amplitude to the supercharging amplitude is larger than a threshold value.
Further, still include: the physical quantity is the air pressure difference between the outside and the inside of the device to be tested or the elastic deformation of a shell for isolating the outside and the inside of the device to be tested; during the pressurization time, failure of the detection of tightness is indicated if one of the following conditions is satisfied: the sensing data does not follow the supercharging direction change; the rate of decrease in the sensed data over a period of time following the boost direction change reaching a peak is greater than the threshold.
Further, still include: and inflating or exhausting the outside of the device to be tested according to the pressurization direction until the variation amplitude of the external air pressure of the device to be tested reaches the pressurization amplitude, and then keeping the pressurization time.
Further, still include: the supercharging direction, the supercharging amplitude and the supercharging time are set in a scene selection mode.
The technical scheme provided by the application has the following beneficial effects: 1. the detection result is clearly judged according to the numerical value, and the equipment to be detected cannot be damaged due to water leakage; 2. the inflation interface, the clamp and the cavity do not need to be customized for the equipment to be tested; 3. the measurement component with common range and precision can meet the detection requirement; 4. different pressures can be applied to the outside of the device to be tested in the detection process so as to simulate a real use scene.
Drawings
Fig. 1 shows a system structure for detecting the air tightness of a camera waterproof case, which includes a wireless pressure module, a host, a pressurizing cavity and equipment to be detected.
Fig. 2 shows a system structure for detecting air tightness by matching the smart waterproof mobile phone with the built-in air tightness detection system with the air tightness detection device.
FIG. 3 shows a system structure of the air tightness detection system in cooperation with an underwater illuminating lamp with an air tightness detection device inside.
Fig. 4 shows a system structure of the air tightness detection system in cooperation with an automobile lamp with an internal air tightness detection device for detecting air tightness.
Detailed Description
In the present application, the specific embodiments and features of the embodiments may be combined with each other without conflict. The described embodiments are only some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the numbers so used are interchangeable under appropriate circumstances in order to describe embodiments of the application. Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, apparatus, or system that comprises a list of steps or modules is not necessarily limited to those steps or modules explicitly listed, but may include other steps or modules not expressly listed or inherent to such process, apparatus, or system.
In order to make those skilled in the art better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings in the embodiments of the present application.
In the first embodiment of the present application, as shown in fig. 1, the air tightness detecting system includes a host 13, a pressure increasing cavity 12, and a wireless pressure module 2, and the device to be detected is a camera waterproof case 31.
The wireless pressure module 2 is a circuit module with the length, width and height of 25mm, 25mm and 10mm, and is provided with an absolute pressure type pressure-insulated pressure sensor 3 and a wireless data sending circuit 9; wherein, the absolute pressure type pressure sensor 3 is an absolute pressure type air pressure sensor with the measuring range of 30 to 110 kilopascals; and a power switch of the wireless pressure module 2 is turned on, the absolute pressure sensor 3 collects pressure data once every 0.1 second, and the wireless data transmitting circuit 9 transmits the pressure data.
The host 13 comprises a microcontroller 14, a pneumatic module 11, a wireless data receiving circuit 15 and a man-machine interface 16, the host 13 is also provided with an air outlet interface 20, the air outlet interface 20 is communicated with the pneumatic module 11 in the host and is communicated with the pressurization cavity 12 through a pipeline 21 in the outside. The microcontroller 14 is respectively connected with the pneumatic module 11, the wireless data receiving circuit 15 and the human-machine interface 16. The pneumatic module 11 is provided with an air pump with a nominal air pressure of 800 kpa. The wireless data receiving circuit 15 receives the pressure data transmitted by the wireless data transmitting circuit 9. The human-computer interaction interface 16 comprises a setting menu 17, a detection button 18, a result display area 19 and the like. The setting menu 17 can set the detection parameters of the supercharging direction, the supercharging amplitude, the supercharging time, the threshold value, and the like by selecting the use scene. Pressing the test button 18, the microcontroller 14 synchronously initiates the following actions: receiving the pressure data transmitted by the wireless data transmitting circuit 9 through the wireless data receiving circuit 15; the control pneumatic module 11 carries out charging according to the set charging direction until the set charging amplitude is reached, and keeps the set charging time. If the change of the pressure data exceeds the threshold value, the failed detection is displayed in the result display area 19 and the pneumatic module 11 is controlled to exhaust, otherwise, the result display area 19 displays the detection, and the result display area 19 displays the passed detection and controls the pneumatic module 11 to exhaust until the set pressurization time is reached and the change of the pressure data does not exceed the threshold value.
The camera waterproof case 31 has high rigidity, can be used within 40 m of underwater depth, and can bear the maximum water pressure of 500 kPa. Assuming that the ambient air pressure at the detection site is 101.325 kpa, the threshold may be set to 5 kpa or 1%.
The air tightness detection steps of the first embodiment of the application are as follows in sequence: s1, setting detection parameters through a setting menu 17 of a human-computer interaction interface 16, setting the pressurization direction as inflation, the pressurization amplitude as 500 kPa, the pressurization time as 10 minutes and the threshold value as 5 kPa or 1%; s2, turning on a power switch of the wireless pressure module 2; s3, placing the wireless pressure module 2 into the airtight cavity 1 of the camera waterproof case 31, and ensuring that the vent 39 of the pressure sensor module 3 is communicated with the interior 1 of the equipment to be tested; s4, placing the camera waterproof shell 31 into the pressurizing cavity 12; s5, pressing the detection button 18 of the human-computer interaction interface 16; s6, waiting for the result of passing or failing detection in the result display area 19 of the human-computer interaction interface 16; s7, exhausting by the pneumatic module 11; and S8, taking out the camera waterproof shell 31 and taking out the wireless pressure module 2.
In the first embodiment of the application, parameters such as the pressurization direction, the pressurization amplitude, the pressurization time and the threshold value can also be adjusted according to different purposes of the device to be detected, and the detection process and the detection effect are optimized.
According to the technical scheme of the first embodiment of the application, the detection result can be definitely judged according to the numerical value, and the equipment to be detected cannot be damaged due to water leakage; the inflation interface, the clamp and the cavity do not need to be customized for the equipment to be tested; the common air pressure sensor can meet the detection requirement without a measuring component with high range and high precision; different air pressures can be applied to the equipment to be tested in the detection to simulate a real use scene.
According to the technical scheme of the first embodiment of the application, the wireless pressure module 2 needs to be placed into the airtight cavity 1 of the camera waterproof case 31 during airtightness detection. However, if some devices to be tested, such as a waterproof camera or a waterproof mobile phone, are disassembled to perform air tightness detection, the sensor module is placed in the device, the device is assembled to perform detection, and the sensor module is disassembled again to take out the device after the detection is completed, so that the process is very complicated. In order to detect the air tightness of the equipment, a sensor can be embedded into a cavity of the equipment, which requires air tightness, in the development and design stage of the equipment; when one piece of equipment completes production and assembly, the sensor is already built in. In particular, the intelligent device with processing capability can cooperate with the air tightness detection device to complete the air tightness detection by running the air tightness detection program, which is described in detail in the following embodiments.
In the second embodiment of the present application, as shown in fig. 2, the smart waterproof mobile phone 32 cooperates with the air tightness detection device to perform the system structure of air tightness detection.
An absolute pressure type pressure sensor 3 is arranged on a PCB in an airtight cavity 1 of the intelligent waterproof mobile phone 32; the air vent 39 of the absolute pressure type pressure sensor 3 is communicated with the airtight cavity 1 of the intelligent waterproof mobile phone 32; the intelligent waterproof mobile phone 32 operates the air tightness detection program 8, and after receiving the READY signal, the microcontroller 14 synchronously starts the following actions: the absolute pressure type pressure sensor 3 collects pressure data every 0.1 second; and sending a pressurization starting instruction through the WIFI module 7. If the change of the pressure data exceeds the threshold value, the screen display fails to detect, and an exhaust instruction is sent through the WIFI module 7; until the set supercharging time is reached and the change of the pressure data does not exceed the threshold value, the screen display passes the detection, and an exhaust instruction is sent through the WIFI module 7.
The air tightness detection device is provided with a microcontroller 14, a READY button 34, a pneumatic module 11, a pressurizing cavity 12 and a WIFI module 33; after the READY button 34 is pressed, the WIFI module 33 sends a READY signal; after the WIFI module 33 receives the pressurization starting instruction, the microcontroller 14 controls the pneumatic module 11 to inflate the pressurization cavity 12 and exhaust the air after keeping for 10 minutes.
The third embodiment of the present application includes the following air tightness detection steps in order: s1, operating the air tightness detection program 8 of the intelligent waterproof mobile phone 32; s2, placing the waterproof smart phone 32 into the pressurizing cavity 12; s3, pressing the READY button 34; s4, inflating the pressurizing cavity 12, and waiting for 10 minutes; s5, exhausting by the pneumatic module 11; and S6, taking out the waterproof mobile phone 8, and checking pressure data and detection result prompts displayed on a screen by the air tightness detection program 8.
It needs to be further explained that: in the third embodiment of the present application, the absolute pressure type pressure sensor 3 built in the waterproof smart phone 32 is substantially different from the barometer built in some mobile phones in the market at present. The barometer built in a part of mobile phones in the current market is used for measuring the air pressure value of the external environment where the mobile phones are located; the vent 39 of the absolute pressure type pressure sensor 3 arranged in the intelligent waterproof mobile phone 32 is communicated with the airtight cavity 1 of the intelligent waterproof mobile phone 32 and is used for measuring the absolute pressure value in the airtight cavity 1; when the waterproof smart phone 32 meets the air tightness requirement, the air-tight cavity 1 is isolated from the external environment of the waterproof smart phone 32. Therefore, the absolute pressure sensor 3 built in the waterproof smart phone 32 cannot be used for measuring the air pressure value of the external environment where the smart phone is located; however, some barometers built in mobile phones in the current market cannot be used for measuring absolute pressure values in the airtight cavities of the mobile phones.
In addition to the absolute pressure type pressure sensor, a differential pressure type pressure sensor or a resistance type strain gauge may be used in the technical solution of the present application, and the following embodiments will be described in detail.
In the third embodiment of the present application, as shown in fig. 3, the air tightness detecting system includes a host 13 and a pressure increasing cavity 12, and the device to be detected is an underwater illuminating lamp 33.
The underwater illuminating lamp 33 has a high rigidity in the housing, and can be used in an underwater depth of 60 m. The pressure sensing module arranged in the airtight cavity 1 of the underwater illuminating lamp 33 is provided with a resistance type strain gauge 4, a signal conditioning circuit 41, an analog-digital conversion circuit 42 and a metal contact group 6; the resistance-type strain gauge 4 is adhered to the inner wall of the sensing area of the airtight cavity 1 of the underwater illuminating lamp 33, and the sensing area selects a part with higher stress in stress simulation analysis of the shell of the underwater illuminating lamp 33 under the action of external pressure; 2 metal contacts in the metal contact group 6 are connected with a 5V direct-current power supply input and a ground wire, and supply power to the resistance type strain gauge 4, the signal conditioning circuit 41 and the analog-digital conversion circuit 42; the other 2 metal contacts are a data line and a clock line of the serial communication interface; and 5V direct current power supply is switched on, and strain data can be read through the serial communication interface.
The main machine 13 comprises a microcontroller 14, an elastic probe interface 22, a pneumatic module 11 and a man-machine interface 16, wherein an air outlet interface 20 is reserved on the main machine 13, the air outlet interface 20 is communicated with the pneumatic module 11 in the main machine, and is communicated with the pressurization cavity 12 through a pipeline 21 in the outside. The microcontroller 14 is connected to the pneumatic module 11, the human-machine interface 16 and the elastic probe interface 22, respectively. The pneumatic module 11 is provided with an air pump with a nominal air pressure of 800 kpa. The elastic probe interface 22 is used for connecting with the metal contact group 6 of the device to be tested and reading strain data. The human-computer interaction interface 16 comprises a setting menu 17, a detection button 18, a result display area 19 and the like. Items of the setting menu 17 include setting detection parameters such as a supercharging direction, a supercharging amplitude, a supercharging time, a threshold value and the like. Pressing the test button 18, the microcontroller 14 synchronously initiates the following actions: reading strain data obtained by sensing the resistance type strain gauge 4 through the elastic probe interface 22; the control pneumatic module 11 carries out charging according to the set charging direction until the set charging amplitude is reached, and keeps the set charging time. If the internal and external pressure difference data does not rise along with the inflation, or the amplitude reduction proportion in a period of time after the peak value is reached is higher than the amplitude reduction threshold value, the failed detection is displayed in the result display area 19, and the pneumatic module 11 is controlled to exhaust; otherwise, the result display area 19 displays that the detection is being performed until the set pressurization time is reached, the result display area 19 displays that the detection is passed, and controls the pneumatic module 11 to exhaust.
In order to improve the sensitivity of strain data, a cylindrical concave structure can be designed at a position where the shell is not subjected to supporting force but is only subjected to external pressure, and a strain gauge is adhered to a cylindrical column body or an end face to enhance the deformation degree.
The third embodiment of the present application includes the following air tightness detection steps in order: s1, setting the pressurization direction as inflation through the setting menu 17 of the human-computer interaction interface 16, wherein the pressurization amplitude is 700 kilopascals, the pressurization time is 5 minutes respectively, the peak threshold value is 50%, and the amplitude reduction threshold value is 1%; s2, placing the underwater illuminating lamp 33 into the pressure boosting cavity 12 to ensure that the metal contact group 6 on the surface of the shell is connected with the elastic probe interface 22; s3, pressing the detection button 18 of the human-computer interaction interface 16; s4, the microcontroller automatically completes the inflation, and the result display area 19 shows the result of passing or failing the detection; s5, exhausting by the pneumatic module 11; and S6, taking out the underwater illuminating lamp 33.
In the fourth embodiment of the present application, as shown in fig. 4, the air tightness detecting system includes a host 13 and a pressure increasing cavity 12, and the device to be detected is an automobile lamp 34.
A differential pressure type pressure sensor 5 is arranged in the airtight cavity 1 of the automobile lamp 34; the measuring range of the differential pressure type pressure sensor 5 is plus or minus 30 kilopascals; one vent hole 52 of the differential pressure type pressure sensor 5 is communicated with the airtight cavity 1 of the automobile lamp 34, and the other vent hole 51 of the differential pressure type pressure sensor 5 is communicated with the outside of the automobile lamp 34 through a pipeline; the differential pressure type pressure sensor 5 is connected with a metal contact group 6 at the bottom of the shell of the automobile lamp 34, wherein 2 metal contacts are a 5V direct-current power supply input and a ground wire and supply power for the differential pressure type pressure sensor 5; the other 2 metal contacts are a data line and a clock line of the serial communication interface; and 5V direct current power supply is switched on, and pressure data can be read through the serial communication interface.
The main machine 13 comprises a microcontroller 14, an elastic probe interface 22, a pneumatic module 11 and a man-machine interface 16, wherein an air outlet interface 20 is reserved on the main machine 13, the air outlet interface 20 is communicated with the pneumatic module 11 in the main machine, and is communicated with the pressurization cavity 12 through a pipeline 21 in the outside. The microcontroller 14 is connected to the pneumatic module 11, the human-machine interface 16 and the elastic probe interface 22, respectively. The pneumatic module 11 is provided with a bidirectional air pump which can inflate and deflate, and the positive pressure and the negative pressure are both more than 30 kilopascals. The elastic probe interface 22 is used for being connected with the metal contact group 6 of the equipment to be tested and reading pressure data obtained by sensing of the differential pressure type pressure sensor 5. The human-computer interaction interface 16 comprises a setting menu 17, a detection button 18, a result display area 19 and the like. The items of the setting menu 17 include setting detection parameters such as a supercharging direction, a supercharging amplitude, a supercharging time, a peak threshold value, a reducing amplitude threshold value and the like. Pressing the test button 18, the microcontroller 14 synchronously initiates the following actions: reading pressure data sensed by the differential pressure type pressure sensor 5 through the elastic probe interface 22; and controlling the pneumatic module 11 to firstly inflate and then evacuate according to the set pressurization direction until the set pressurization amplitude is reached, and keeping the set pressurization time. If the internal and external pressure difference data does not rise along with inflation or fall along with air extraction, or the fall proportion in a period of time after the peak value is reached is higher than the fall threshold value, the failed detection is displayed in the result display area 19, and the pneumatic module 11 is controlled to exhaust; otherwise, the result display area 19 displays that the detection is being performed until the set pressurization time is reached, the result display area 19 displays that the detection is passed, and controls the pneumatic module 11 to exhaust.
The air tightness detection steps of the fourth embodiment of the application are as follows in sequence: s1, setting the pressurizing direction to be firstly inflating and then exhausting through the setting menu 17 of the human-computer interaction interface 16, wherein the pressurizing amplitude is 20 kilopascals, the pressurizing time is 30 seconds respectively, the peak threshold value is 95%, and the amplitude reducing threshold value is 1%; s2, placing the automobile lamp 34 into the pressure increasing cavity 12 to ensure that the metal contact group 6 on the surface of the shell is connected with the elastic probe interface 22; s3, pressing the detection button 18 of the human-computer interaction interface 16; s4, the microcontroller automatically completes two processes of inflation and air exhaust, and the result display area 19 shows the result of passing or failing detection; s5, exhausting by the pneumatic module 11; and S6, taking out the automobile lamp 34.
Claims (23)
1. An air-tightness detection system, characterized by comprising: the device comprises a pressurization module, a sensing module and a judgment module;
the method comprises the following steps that a pressurizing module obtains a pressurizing direction, a pressurizing amplitude and a pressurizing time of a pressurizing process, the pressurizing process is a process that the system or a device which is matched with the system to carry out air tightness detection exerts an action, so that the air pressure outside a device to be detected is subjected to controlled change, and the pressurizing direction, the pressurizing amplitude and the pressurizing time are the direction, the amplitude and the time of the controlled change;
the sensing module acquires sensing data, which is derived by sensing one of the following physical quantities: the device to be tested comprises air pressure inside the device to be tested, air pressure difference between the outside and the inside of the device to be tested, and elastic deformation of a shell of the device to be tested for isolating the outside from the inside;
and under the pressurization direction, the pressurization amplitude and the pressurization time, the judgment module judges the air tightness detection result according to the change of the sensing data.
2. The system of claim 1, further comprising: a communication module;
the communication module receives the sensed data.
3. The system of claim 1,
the physical quantity is the air pressure in the device to be tested;
within the pressurization time, the discrimination module indicates failure of the air-tightness detection if the following conditions are satisfied: the sensing data changes along with the supercharging direction, and the ratio of the change amplitude of the sensing data to the supercharging amplitude is larger than a threshold value.
4. The system of claim 3, further comprising: an absolute pressure type pressure sensor;
the vent hole of the absolute pressure type pressure sensor is communicated with the interior of the device to be tested;
and the absolute pressure type pressure sensor senses the air pressure in the device to be tested to obtain the sensing data.
5. The system of claim 1,
the physical quantity is the air pressure difference between the outside and the inside of the device to be tested or the elastic deformation of a shell for isolating the outside and the inside of the device to be tested;
during the pressurization time, the determination module indicates that the air tightness detection is failed if one of the following conditions is satisfied: the sensed data does not follow the charging direction change; the sensing data follows the supercharging direction change and the falling proportion in a period of time after the peak value is reached is larger than a threshold value.
6. The system of claim 5, further comprising: a differential pressure type pressure sensor;
a first vent hole of the differential pressure type pressure sensor is communicated with the outside of the device to be tested, and a second vent hole of the differential pressure type pressure sensor is communicated with the inside of the device to be tested;
and the differential pressure type pressure sensor senses the air pressure difference between the outside and the inside of the device to be tested to obtain the sensing data.
7. The system of claim 5, further comprising: a resistance strain gauge;
the shell is provided with an induction area, and the resistance type strain gauge is pasted on the inner wall or the outer wall of the induction area;
the resistance-type strain gauge induces the elastic deformation of the shell of the device to be tested for isolating the outside from the inside to obtain the sensing data.
8. The system of claim 7, wherein the sensing region has a configuration that differs from a perimeter by at least one of: the thickness is different, and the material is different, has protruding structure, has the sunk structure.
9. The system of claim 1, further comprising: a pressurizing cavity and a pneumatic device;
the pressurization cavity is used for accommodating the device to be tested;
the pneumatic device is communicated with the pressurizing cavity;
and the pneumatic device inflates or evacuates the pressurization cavity according to the pressurization direction until the change amplitude of the air pressure in the pressurization cavity reaches the pressurization amplitude, and then the pressurization time is kept.
10. The system of claim 1, further comprising: setting a module;
the setting module sets the supercharging direction, the supercharging amplitude and the supercharging time in a scene selection mode.
11. An apparatus for performing a gas-tight test in cooperation with the system of claim 2, comprising: a sensor module and a communication module;
the sensor module senses one of the following physical quantities to obtain sensing data: air pressure inside the device, air pressure difference between the outside and the inside of the device, elastic deformation of a shell of the device isolating the outside from the inside;
the communication module transmits the sensed data to the system of claim 2.
12. The apparatus of claim 11, further comprising: a metal contact exposed on the device;
the communication module is connected with the metal contact;
the communication module transmits the sensing data through the metal contact.
13. The apparatus of claim 11, wherein the sensor module is provided with an absolute pressure type pressure sensor;
the vent hole of the absolute pressure type pressure sensor is communicated with the interior of the device;
the absolute pressure sensor senses the air pressure inside the device to obtain the sensing data.
14. The apparatus of claim 11, wherein the sensor module is provided with a pressure sensor of differential pressure type;
a first vent hole of the differential pressure type pressure sensor is communicated with the outside of the device, and a second vent hole of the differential pressure type pressure sensor is communicated with the inside of the device;
the pressure sensor of the differential pressure type senses the air pressure difference between the outside and the inside of the device to obtain the sensing data.
15. The apparatus of claim 11, wherein the sensor module is provided with a resistive strain gauge;
the shell is provided with an induction area, and the resistance type strain gauge is pasted on the inner wall or the outer wall of the induction area;
the resistance strain gauge senses elastic deformation of a shell of the device for isolating the outside from the inside to obtain the sensing data.
16. The apparatus of claim 15, wherein the sensing region is configured to have at least one of the following differences with respect to a perimeter: the thickness is different, and the material is different, has protruding structure, has the sunk structure.
17. An apparatus for performing a gas-tight test in cooperation with the system of any one of claims 1 to 8, comprising: a pressurizing cavity and a pneumatic device;
the pressurization cavity is used for accommodating the device to be tested;
the pneumatic device is communicated with the pressurizing cavity;
and the pneumatic device inflates or evacuates the pressurization cavity according to a preset pressurization direction until the change amplitude of the air pressure in the pressurization cavity reaches a preset pressurization amplitude, and then the preset pressurization time is kept.
18. The apparatus of claim 17, further comprising: setting a module;
the setting module sets the supercharging direction, the supercharging amplitude and the supercharging time in a scene selection mode.
19. A method for detecting airtightness, comprising:
exerting an action to enable the external air pressure of the device to be tested to be controlled and changed, wherein the direction, the amplitude and the time of the controlled change are recorded as a pressurization direction, a pressurization amplitude and a pressurization time;
sensing data by sensing one of the following physical quantities: the device to be tested comprises air pressure inside the device to be tested, air pressure difference between the outside and the inside of the device to be tested, and elastic deformation of a shell of the device to be tested for isolating the outside from the inside;
and judging an air tightness detection result according to the change of the sensing data under the pressurization direction, the pressurization amplitude and the pressurization time.
20. The method of claim 19, further comprising:
the physical quantity is the air pressure in the device to be tested;
within the pressurization time, failure of the detection of tightness is indicated if the following conditions are satisfied: the sensing data changes along with the supercharging direction, and the ratio of the change amplitude of the sensing data to the supercharging amplitude is larger than a threshold value.
21. The method of claim 19, further comprising:
the physical quantity is the air pressure difference between the outside and the inside of the device to be tested or the elastic deformation of a shell for isolating the outside and the inside of the device to be tested;
within the pressurization time, failure of the detection of tightness is indicated if one of the following conditions is satisfied: the sensed data does not follow the charging direction change; the sensing data follows the supercharging direction change and the falling proportion in a period of time after the peak value is reached is larger than a threshold value.
22. The method of claim 19, further comprising:
and inflating or evacuating the outside of the device to be tested according to the pressurization direction until the variation amplitude of the external air pressure of the device to be tested reaches the pressurization amplitude, and then keeping the pressurization time.
23. The method of claim 19, further comprising:
and setting the supercharging direction, the supercharging amplitude and the supercharging time in a scene selection mode.
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|---|---|---|---|
| CN202310894448.1A CN116839839A (en) | 2020-10-26 | 2020-10-26 | Waterproof intelligent equipment with air tightness detection function |
| CN202011142585.2A CN112197918A (en) | 2020-10-26 | 2020-10-26 | Air tightness detection system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011142585.2A CN112197918A (en) | 2020-10-26 | 2020-10-26 | Air tightness detection system and method |
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| CN202310894448.1A Division CN116839839A (en) | 2020-10-26 | 2020-10-26 | Waterproof intelligent equipment with air tightness detection function |
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| CN202310894448.1A Pending CN116839839A (en) | 2020-10-26 | 2020-10-26 | Waterproof intelligent equipment with air tightness detection function |
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Cited By (1)
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| CN115560926A (en) * | 2022-11-30 | 2023-01-03 | 四川欧乐智能技术有限公司 | Mobile phone sealing performance detection method and device |
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| CN116839839A (en) | 2023-10-03 |
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Application publication date: 20210108 |