CN116242558A - Air tightness detection system and detection method thereof - Google Patents

Abstract

The invention discloses an air tightness detection system and a detection method thereof, wherein an object to be detected for air tightness is placed in a detection box, the object to be detected is connected by a vent pipe, a terminal server sets an initial temperature value and an initial pressure value which are the same as the external environment and the time of releasing air by a gas source, and an electromagnetic valve is opened, and the air source is used for filling air into the object to be detected; closing the electromagnetic valve after the gas source releases the gas, driving the motor in the detection box to drive the clamping mechanism to clamp the object to be detected, and starting to detect the air tightness after the differential pressure value between the object to be detected and the external environment is stable and balanced; the data acquisition module sends acquired data to the data processing module, the data processing module judges the air tightness of the object to be detected according to the acquired data, and the judging result is sent to the terminal server; the technical problem that the conventional air tightness detection system cannot clamp and fix an object to be detected, and the problem that the air tightness detection result of the object to be detected is inaccurate due to slight vibration inside the object to be detected is solved.

Description

A kind of air tightness detection system and its detection method

technical field

The present application relates to the technical field of detection, in particular to an air tightness detection system and a detection method thereof.

Background technique

Air-tightness refers to the gas-tight performance of the device. The air-tightness test is mainly to check whether there is leakage at each connection part of the object to be tested, and is used to determine the sealing performance of the object to be tested. plays a very important role.

The commonly used method for air tightness testing is the differential pressure method. The gas of the same pressure is filled into the object under test and the reference object at the same time, so that the pressures at both ends of the differential pressure sensor diaphragm are completely equal, and then the balance is observed. If the diaphragm of the differential pressure sensor will continue to maintain a balanced state, it can be known that the object under test does not leak and the airtightness is good. If the pressure inside the object to be tested gradually decreases, the balance of the diaphragm will be broken, and the diaphragm will be slightly deflected, then it can be known that the object to be tested has leakage and the airtightness is not good.

When using the differential pressure method to detect air tightness, it is necessary to inflate the object to be tested. After the inflation is complete and the differential pressure between the object to be tested and the reference object is stable, the differential pressure change is measured. During this process, due to the gas flow At this time, the object under test may cause vibration and cause internal pressure and temperature fluctuations. For objects under test with different sizes, it takes different time for the differential pressure to stabilize. However, there is no clamping mechanism in the traditional detection system to fix the object to be measured, so that it takes a long time for the differential pressure to stabilize in the initial state, the object to be measured may be measured before it is stabilized, and the vibration of the object to be measured may cause The result is not accurate enough.

Contents of the invention

The embodiment of the present application provides an airtightness detection system and its detection method, which are used to solve the problem that the object under test cannot be clamped and fixed in the traditional airtightness detection system, and prevent the slight vibration inside the object under test from causing The technical problem of inaccurate air tightness test results.

In view of this, the application provides an air tightness detection system, including: air source, solenoid valve control module, data acquisition module, data processing module, terminal server, detection box;

The gas source is connected to the solenoid valve control module, and the solenoid valve control module is connected to the detection object in the box through the ventilation pipe, and controls the startup and shutdown of the solenoid valve according to the instructions of the terminal server;

The data acquisition module is used to collect the internal temperature value of the test object, the pressure difference value between the test object and the external environment;

The data processing module is used to analyze and process the data collected by the data acquisition module, and send the obtained analysis results to the terminal server;

The terminal server receives the analysis result of the data processing module;

The rear side of the detection box is fixedly connected with a driving mechanism, and the driving mechanism is slidably connected with a clamping mechanism;

The clamping mechanism is used to clamp the object to be measured, including a first connecting rod and a second connecting rod. There are two first connecting rods and second connecting rods. A sliding rod is connected to the first connecting rod, and the first connecting rod The upper end of the second connecting rod is rotationally connected with the driving mechanism, the lower end is connected with the Z-shaped rod, and the Z-shaped rod is fixedly connected with a clamping plate.

Optionally, the driving mechanism includes a driving motor, the output shaft of the driving motor is connected with a coupling, the output end of the coupling is connected with a screw, the screw is provided with a nut, and the nut is connected with the first connecting rod.

Optionally, bases are provided on the bottoms on both sides of the detection box, and the bases are connected to the sliding rods through screws.

Optionally, the data acquisition module includes a temperature sensor and a differential pressure sensor.

Optionally, it also includes: a display module; the display module is arranged on the test box, and is used to display the temperature difference between the inside of the test object and the external environment, and the pressure difference between the test object and the external environment.

Optionally, it also includes: an alarm module; the alarm module includes an alarm indicator light and an alarm speaker, and the alarm indicator light and the alarm speaker are connected to the terminal server.

A method for air tightness detection, comprising the steps of:

Set the initial value, fill the test object with gas, put the test object into the detection box, the terminal server sets the same initial temperature value, initial pressure value and the time for the gas source to release the gas as the external environment, and the solenoid valve control module passes The command of the terminal server opens the solenoid valve, and the gas source fills the inside of the object to be tested in the detection box through the ventilation pipe;

Inflate balance. After the time for the gas source to release the gas is over, close the solenoid valve, drive the motor in the detection box, and drive the clamping mechanism to clamp the object to be tested. After clamping the object to be tested and waiting for a certain period of time, the object to be tested will The differential pressure value with the external environment is stable and balanced;

Air tightness detection, the data acquisition module starts to work, and sends the temperature value inside the object under test collected by the temperature sensor, the pressure difference between the object under test and the external environment detected by the differential pressure sensor to the data processing module, and the data processing module Calculate the difference between the internal temperature value of the test object collected by the temperature sensor and the initial temperature of the external environment, and analyze and process the temperature difference and the differential pressure value collected by the differential pressure sensor to determine the gas pressure of the test object. Whether the confidentiality is qualified, and the judgment result is sent to the terminal server;

If the test is unqualified, an alarm will be issued; if the air tightness of the object under test is unqualified, the alarm indicator light will be on and the alarm speaker will sound an alarm.

It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

An airtightness detection system provided by the present invention puts the object to be tested that needs to be tested for airtightness into the detection box, and connects the object to be tested with a ventilator, and the terminal server sets the same initial temperature value and initial pressure as the external environment value and the time when the gas source releases the gas, open the solenoid valve, and the gas source fills the interior of the object to be tested in the test box through the ventilation pipe; after the time for the gas source to release the gas is over, close the solenoid valve and drive the test box The motor inside drives the clamping mechanism to clamp the object under test, and after waiting for a certain period of time to make the differential pressure value between the object under test and the external environment stable and balanced, the air tightness test is started; the temperature sensor and differential pressure sensor of the data acquisition module will The collected data is sent to the data processing module, and the data processing module judges the airtightness of the object to be tested according to the collected data, and sends the judgment result to the terminal server; the detection system is simple to operate and more convenient to use.

In the present invention, the motor drives the screw to rotate, and drives the nut on the screw to move back and forth, at the same time, the first connecting rod and the second connecting rod connected to the extension of the nut move, and the sliding rod connected to the first connecting rod moves, The Z-shaped rod connected with the first connecting rod and the second connecting rod is driven, and the distance between the two clamping plates is changed, thereby clamping and releasing the object to be tested; solving the problem in the traditional air tightness detection system The object to be tested cannot be clamped and fixed to prevent the technical problem of inaccurate air tightness test results of the object to be tested caused by slight vibration inside the object to be tested.

Description of drawings

FIG. 1 is a block diagram of an air tightness detection system provided in an embodiment of the present invention;

2 is a schematic structural diagram of an air tightness detection system provided in an embodiment of the present invention;

Fig. 3 is the internal structure diagram of the detection box provided in the embodiment of the present invention;

Fig. 4 is a structural diagram of the clamping plate of the clamping mechanism provided in the embodiment of the present invention in a clamped state;

Fig. 5 is a structural diagram of the clamping mechanism provided in the embodiment of the present invention when the clamping plate is released;

Fig. 6 is a schematic flow chart of an air tightness detection method provided in an embodiment of the present invention;

Wherein, reference sign is:

1. Detection box; 111. Drive motor; 112. Coupling; 113. Screw rod; 114. Nut; 121. Clamping plate; 122. Z-shaped rod; 123. First connecting rod; 124. Second connecting rod ; 125, sliding rod; 13, fixed seat.

Implementation

In order to enable those skilled in the art to better understand the solution of the application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the drawings in the embodiment of the application. Obviously, the described embodiment is only It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application. In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer " and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, Constructed and operative in a particular orientation and therefore should not be construed as limiting to the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the embodiments of this application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a A detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediary, and it may be an internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application in specific situations.

Example 1

For ease of understanding, please refer to Figure 1 to Figure 2, an embodiment of an air tightness detection system provided by this application, including: air source, solenoid valve control module, data acquisition module, data processing module, terminal server, detection box, display module and alarm module;

The gas source is connected to the solenoid valve control module, and the solenoid valve control module is connected to the detection object in the box through the ventilation pipe, and controls the startup and shutdown of the solenoid valve according to the instructions of the terminal server;

The data acquisition module includes a temperature sensor and a differential pressure sensor. The temperature sensor is installed inside the detection box to collect the internal temperature value of the object to be tested. The differential pressure sensor is installed outside the detection box to obtain the temperature of the object to be tested and the external environment. differential pressure value;

The data processing module receives the data collected by the temperature sensor and the differential pressure sensor in the data acquisition module, and calculates the difference between the temperature value inside the object to be measured collected by the temperature sensor and the initial temperature of the external environment, and calculates the temperature difference The temperature difference and the differential pressure value collected by the differential pressure sensor are analyzed and processed to determine whether the temperature difference and differential pressure value meet the air tightness detection requirements of the object under test, and the judgment result is sent to the terminal server;

The terminal server receives the analysis result of the data processing module;

The display module is set on the detection box, and is used to display the temperature difference between the object under test and the external environment, and the pressure difference between the object under test and the external environment;

The alarm module is connected to the terminal server, including the alarm indicator light and the alarm speaker. The alarm indicator light and the alarm speaker are connected to the terminal server. Send an alarm command to start the alarm module, the alarm indicator light is on, and the alarm speaker is sounding.

Only when the data processing module judges that the temperature difference value and the differential pressure value meet the requirements, can it be judged that there is no leakage of the object under test, the alarm indicator light will not light up, and the alarm speaker will not emit sound.

Please refer to Fig. 3, the driving mechanism is fixedly connected to the rear side of the detection box 1, and the clamping mechanism is slidingly connected to the front side of the driving mechanism.

The driving mechanism is used to drive the clamping mechanism to clamp or loosen the object to be tested, and includes a driving motor 111, the output shaft of the driving motor 111 is connected with a coupling 112, and the output end of the coupling 112 is connected with a screw rod 113, the screw rod 113 is slidably connected with a nut 114, which can drive the screw 113 to rotate under the action of the driving motor 111, thereby driving the nut 114 to move along the screw 113, and the nut 114 is connected with the clamping mechanism;

The clamping mechanism is used to clamp the object to be tested, and includes a first connecting rod 123 and a second connecting rod 124. There are two first connecting rods 123 and second connecting rods 124, which are respectively symmetrically arranged on the left and right sides of the nut 114 At the extension, the upper ends of the first connecting rod 123 and the second connecting rod 124 are respectively rotatably connected with the extension of the nut 114 by screws. When the nut 114 moves along the screw rod 113, it can drive the first connecting rod 123 and the second connecting rod. 124 movement, the lower ends of the first connecting rod 123 and the second connecting rod 124 are respectively connected with one end of the Z-shaped rod 122 by screws, and the other end of the Z-shaped rod 122 is fixedly connected with a clamping plate 121, and the clamping plate 121 can directly Contacting the object to be tested drives the clamping mechanism to move under the action of the driving mechanism, so that the distance between the two clamping plates 121 of the clamping mechanism changes, thereby clamping or releasing the object to be tested.

Both sides of detection box 1 bottom are provided with base 13, and base 13 is rotatably connected with the upper end of slide bar 125 by screw, and the lower end of slide bar 125 is rotatably connected with first connecting bar 123 by screw.

Please refer to FIG. 4 , when the driving motor 111 rotates in the reverse direction, the driving screw 113 rotates in the reverse direction, driving the nut on the screw rod 113 to move backward. During the process of the nut moving backward, the first connecting rod 123 is driven. The angle between the first connecting rod 123 and the second connecting rod 124 and the Z-shaped rod 122 is constantly decreasing, and the angle between the first connecting rod 123 and the second connecting rod 122 is constantly increasing. 124 drives the Z-shaped rod 122 to move downward continuously, and the distance between the two clamping plates 12+1 connected with the Z-shaped rod 122 is continuously reduced until the nut moves to the rearmost side of the screw rod 113, the first connecting rod 123 and the sliding rod 125 form an acute angle, the angles between the first connecting rod 123 and the second connecting rod 124 and the Z-shaped rod 122 respectively form an obtuse angle, and the distance between the two clamping plates 121 reaches the minimum .

Please refer to Fig. 5, when the driving motor 111 rotates in the forward direction, the driving screw 113 rotates in the forward direction, driving the nut on the screw rod 113 to move forward, during which the nut is constantly moving forward, thereby driving the nut connected to the extension The first connecting rod 123 and the second connecting rod 124 are continuously straightened in the horizontal direction, so that the angle between the first connecting rod 123 and the sliding rod 125 is constantly increasing, and the first connecting rod 123 and the second connecting rod 124 are respectively The angle between the Z-shaped rod 122 is continuously reduced, and at the same time, the first connecting rod 123 and the second connecting rod 124 drive the Z-shaped rod 122 to move upward continuously, and the gap between the two clamping plates 121 connected with the Z-shaped rod 122 The distance increases continuously until the nut moves to the frontmost side of the screw rod 113, the angle between the first connecting rod 123 and the sliding rod 125 is 90°, and the first connecting rod 123 and the second connecting rod 124 are respectively connected to Z The angle between the molded rods 122 is 90°, and the distance between the two clamping plates 121 reaches the maximum.

Therefore, when the object to be tested needs to be clamped, the door of the detection box 1 is opened, the object to be tested is placed between the two clamping plates 121, and then the driving motor 111 is reversed to drive the screw mandrel 113 to reverse, and then The nut on the screw mandrel 113 moves backward, and the nut moves while driving the first connecting rod 123 and the second connecting rod 124 to move backward, and the sliding rod 125 and the Z-shaped rod 122 connected with the first connecting rod 123 move upward accordingly , the clamping plates 121 on both sides are constantly moving closer together, and when they are close to a certain distance, the object to be tested will be clamped, so that the clamping plates 121 clamp the object to be tested, and the door of the detection box 1 is closed, and the subsequent airtightness of the object to be tested During the test, the object to be tested is always clamped.

After the air-tightness test is finished, drive the motor 111 to rotate forward, and drive the screw mandrel 113 to rotate forward, and then the nut on the screw mandrel 113 moves forward, and the nut moves while driving the first connecting rod 123 and the second connecting rod 124 forward movement, the sliding rod 125 and the Z-shaped rod 122 connected with the first connecting rod 123 move downward thereupon, and the Z-shaped rods on both sides also constantly move outward during the downward movement of the Z-shaped rod 122, and the two clamping plates The distance between 121 is continuously enlarged, so that the clamping plate 121 releases the object to be tested, the door of the detection box 1 is opened, and the object to be tested is taken out.

It should be noted that in the present invention, a differential pressure sensor is installed between the object to be tested and the external environment, and the object to be tested is placed in the airtight detection box 1, so what is finally detected is the difference between the object to be tested in the detection box 1 and the external environment. Pressure difference, that is, the change value of the internal and external pressure of the detected valve, due to the airtightness of the detection box, and the initial gas has been filled to the test object to ensure that the internal pressure of the test object is the same as the pressure value of the external environment, even if the valve, inflated Tube leaks have no effect on test results.

An airtightness detection system provided by the present invention puts the object to be tested that needs to be tested for airtightness into the detection box 1, and connects the object to be tested with a ventilator. The terminal server sets the same initial temperature value and initial temperature value as the external environment. The pressure value and the time for the gas source to release the gas, open the solenoid valve, and the gas source fills the interior of the object to be tested in the test box through the ventilation pipe; after the time for the gas source to release the gas is over, close the solenoid valve and drive the detection The motor in the box drives the clamping mechanism to clamp the object under test, and after waiting for a certain period of time to make the differential pressure value between the object under test and the external environment stable and balanced, the air tightness test begins; the temperature sensor and differential pressure sensor of the data acquisition module Send the collected data to the data processing module, and the data processing module judges the airtightness of the object to be tested according to the collected data, and sends the judgment result to the terminal server; the detection system is simple to operate and more convenient to use;

After inflating the object to be tested, the object to be tested can be quickly stabilized due to the clamping mechanism in the test box to clamp and fix the object to be tested, preventing slight vibration inside the object to be tested, making the detection result more accurate.

Example 2

For ease of understanding, referring to FIG. 6, the present invention provides an embodiment of an airtightness detection method, which includes the following steps:

101: Set the initial value, fill the object to be tested with gas; put the object to be tested into the detection box, the terminal server sets the same initial temperature value, initial pressure value and the time for the gas source to release the gas as the external environment, and the solenoid valve controls The module opens the solenoid valve through the command of the terminal server, and the gas source fills the inside of the test object body in the detection box through the ventilation pipe;

102: Inflation balance; after the time for the gas source to release the gas is over, close the solenoid valve, drive the motor in the detection box, drive the clamping mechanism to clamp the object to be tested, clamp the object to be tested and wait for a certain period of time, so that the object to be tested The differential pressure value between the measured object and the external environment is stable and balanced;

103: Air tightness detection; the data acquisition module starts to work, and sends the temperature value inside the object under test collected by the temperature sensor, the pressure difference between the object under test and the external environment detected by the differential pressure sensor to the data processing module, and the data The processing module calculates the difference between the internal temperature value of the test object collected by the temperature sensor and the initial temperature of the external environment, and analyzes the temperature difference and the differential pressure value collected by the differential pressure sensor to determine the temperature difference of the test object. Whether the airtightness is qualified, and the judgment result is sent to the terminal server;

104: Alarm if the test is unqualified; if the airtightness judgment result of the object to be tested is unqualified, the alarm indicator light will be on and the alarm speaker will sound an alarm.

As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still understand the foregoing The technical solutions described in each embodiment are modified, or some of the technical features are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the application.

Claims (7)

1. An air tightness detection system, characterized in that, comprising: an air source, a solenoid valve control module, a data acquisition module, a data processing module, a terminal server, and a detection box; The air source is connected to the solenoid valve control module, and the solenoid valve control module is connected to the object to be tested in the detection box through the ventilation pipe, and controls the startup and shutdown of the solenoid valve according to the instructions of the terminal server; The data acquisition module is used to collect the internal temperature value of the test object, the pressure difference value between the test object and the external environment; The data processing module is configured to analyze and process the data collected by the data collection module, and send the obtained analysis results to the terminal server; The terminal server receives the analysis result of the data processing module; The rear side inside the detection box is fixedly connected with a driving mechanism, and the driving mechanism is slidably connected with a clamping mechanism; The clamping mechanism is used to clamp the object to be tested, and includes a first connecting rod and a second connecting rod, two of the first connecting rod and the second connecting rod are provided, and the first connecting rod is connected to There is a sliding rod, the upper ends of the first connecting rod and the second connecting rod are connected to the driving mechanism in rotation, and the lower ends are connected to the Z-shaped rod, and the Z-shaped rod is fixedly connected with a clamping plate. 2. A kind of air tightness detection system according to claim 1, it is characterized in that, described driving mechanism comprises driving motor, and the output shaft of described driving motor is connected with coupling, and the output end of described coupling A threaded rod is connected, and a nut is provided on the threaded rod, and the nut is connected with the first connecting rod. 3 . The airtightness testing system according to claim 1 , wherein bases are provided on the bottoms of both sides of the testing box, and the bases are connected to the sliding rods by screws. 4 . 4. The air tightness detection system according to claim 1, wherein the data acquisition module includes a temperature sensor and a differential pressure sensor. 5. The airtightness detection system according to claim 1, further comprising: a display module; the display module is arranged on the detection box for displaying the inside and outside of the object under test The temperature difference of the environment, the pressure difference between the object under test and the external environment. 6. A kind of airtightness detection system according to claim 1, is characterized in that, also comprises: Alarm module; Described alarm module comprises alarm indicator light and alarm speaker, and described alarm indicator light is connected with described alarm speaker to the terminal server. 7. An airtightness detection method, is characterized in that, comprises the following steps: Set the initial value, fill the test object with gas; put the test object into the detection box, the terminal server sets the same initial temperature value, initial pressure value and gas release time as the external environment, and the solenoid valve control module passes The command of the terminal server opens the solenoid valve, and the gas source fills the inside of the object to be tested in the detection box through the ventilation pipe; Inflation balance; after the time for the gas source to release the gas is over, close the solenoid valve, drive the motor in the detection box, drive the clamping mechanism to clamp the object to be tested, clamp the object to be tested and wait for a certain period of time, so that the object to be tested The differential pressure value with the external environment is stable and balanced; Air tightness detection; the data acquisition module starts to work, and sends the temperature value inside the object under test collected by the temperature sensor, the pressure difference between the object under test and the external environment detected by the differential pressure sensor to the data processing module, and the data processing module Calculate the difference between the internal temperature value of the test object collected by the temperature sensor and the initial temperature of the external environment, and analyze and process the temperature difference and the differential pressure value collected by the differential pressure sensor to determine the gas pressure of the test object. Whether the confidentiality is qualified, and the judgment result is sent to the terminal server; If the test is unqualified, an alarm will be issued; if the air tightness of the object under test is unqualified, the alarm indicator light will be on and the alarm speaker will sound an alarm.

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