WO2020082374A1

WO2020082374A1 - Product air tightness detection device and detection method therefor

Info

Publication number: WO2020082374A1
Application number: PCT/CN2018/112221
Authority: WO
Inventors: 尹朋; 黄祥钧; 侯晓东; 兰启庆
Original assignee: 深圳配天智能技术研究院有限公司
Priority date: 2018-10-26
Filing date: 2018-10-26
Publication date: 2020-04-30
Also published as: CN111684255A

Abstract

A product air tightness detection device (100) and a detection method therefor, the product air tightness detection device (100) comprising: a closed container (10), a pressure generation device (20) and a pressure detection device (30). A sealed cavity (12) is formed in the closed container (10) and is used for accommodating a product (A) to undergo detection; the pressure generation device (20) is connected to the sealed cavity (12) and is used for moving relative to the sealed container (10) so as to change the sealed volume of the sealed cavity (12); the pressure detection device (30) is arranged in the sealed cavity (12) and is used for detecting a pressure value in the sealed cavity (12). The present product air tightness detection device (100) determines the air tightness of the product (A) to undergo detection by measuring the pressure value difference between a standard sample (A') and the product (A) to undergo detection under the same conditions in the sealed cavity (12). The device (100) has a simple structure,employs a novel test method, and may be integrated into an automated production line to carry out automated detection, so that testing efficiency may be effectively improved.

Description

Product air tightness detection device and detection method

【Technical Field】

The present application belongs to the technical field of air tightness detection, and particularly relates to a product air tightness detection device and a detection method thereof.

【Background technique】

In industrial production, some products have strict requirements for air tightness. These products need to undergo strict air tightness tests before leaving the factory to meet the needs of use.

At present, commonly used detection devices usually include a high-pressure gas source. By controlling the high-pressure gas source to inflate and deflate, the target air pressure acts on the product to be tested, and the air tightness of the product is judged by viewing the change in air pressure. The inventor of the present application discovered during the long-term research and practice that the test equipment used by this detection method is usually more complicated in structure and has low test efficiency, which is not convenient for automated testing.

[Invention content]

The present application provides a product air tightness detection device and a detection method thereof, which are used to solve the problems in the prior art that the product air tightness detection device has a complicated structure, low detection efficiency, and is not convenient for automated testing.

In order to solve the above technical problems, a technical solution adopted by the present application is to provide a product airtightness detection device. The product airtightness detection device includes: a sealed container, and a sealed cavity is formed in the sealed container for Accommodating the product to be tested; a pressure generating device connected to the sealed cavity for moving relative to the sealed container to change the sealed volume of the sealed cavity; a pressure detecting device provided in the sealed cavity , Used to detect the pressure value in the sealed cavity.

To solve the above technical problems, another technical solution adopted by the present application is to provide a product air tightness detection method for a product air tightness detection device. The product air tightness detection method includes: a sealed cavity of a closed container Placing the detection product; controlling the product to be tested at a preset sealed volume; controlling the pressure detection device to detect the pressure value in the sealed cavity when the product to be tested is at the preset sealing volume; judging the pressure value and Whether the absolute value of the difference of the standard pressure value is less than or equal to the preset value, if yes, the tightness of the product to be tested is qualified, if not, the tightness of the product to be tested is unqualified.

The beneficial effects of the present application are: different from the situation in the prior art, a product airtightness detection device provided by the present application first places the product to be tested in a sealed cavity of a closed container when detecting, and then uses pressure to generate The device compresses the sealed cavity to change the sealed volume of the sealed cavity, and further detects the pressure value in the sealed cavity by the pressure detection device, and compares this pressure value with the standard pressure value when the standard sample is in the same sealed volume to judge the product to be tested 'S tightness. The product airtightness detection device in the present application has a simple structure and a novel test method, and can be integrated into an automated production line for automated detection, thereby effectively improving test efficiency.

【Explanation of Drawing】

In order to more clearly explain the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only This is an embodiment of the present application. For those of ordinary skill in the art, without paying any creative labor, other drawings may be obtained according to the provided drawings.

FIG. 1 is a schematic diagram of a three-dimensional structure of a product airtightness detection device according to an embodiment of the present application;

2 is a schematic sectional view of the product airtightness detection device in FIG. 1;

3 is a schematic structural view of another embodiment of the product airtightness detection device shown in FIG. 1;

4 is a schematic structural view of another embodiment of the product airtightness detection device shown in FIG. 1;

5 is a schematic flowchart of a method for detecting air tightness in an embodiment of the present application;

FIG. 6 is a schematic flow chart of testing a standard sample in an embodiment of this application;

7 is a schematic diagram of a process for controlling a product to be tested to be in a preset sealed volume.

【detailed description】

The present application will be described in further detail below with reference to the drawings and embodiments. In particular, the following embodiments are only used to illustrate the present application, but do not limit the scope of the present application. Similarly, the following embodiments are only a part of the embodiments of the present application but not all the embodiments. All other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

Reference herein to "embodiments" means that specific features, structures, or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive of other embodiments. Those skilled in the art understand explicitly and implicitly that the embodiments described herein can be combined with other embodiments.

This application provides a product airtightness detection device, as shown in FIGS. 1 and 2, FIG. 1 is a three-dimensional structural schematic diagram of a product airtightness detection device according to an embodiment of the present application, and FIG. 2 is a product airtightness detection in FIG. 1 Schematic diagram of the cross-sectional structure of the device. The product airtightness detection device 100 includes a sealed container 10, a pressure generating device 20 and a pressure detection device 30. A sealed cavity 12 is formed in the sealed container 10, a pressure generating device 20 is connected to the sealed container 10, and can move relative to the sealed container 10 to change the volume of the sealed cavity 12, and a pressure detection device 30 is provided in the sealed cavity 12 for The pressure value in the sealed cavity 12 is detected.

The working principle of the product airtightness detection device 100 in the embodiment of the present application is that: the product A to be tested is placed in the sealed cavity 12 of the sealed container 10, and then the pressure generating device 20 is controlled to move relative to the sealed container 10 to change the sealed cavity 12 In the sealed volume in, the pressure detection device 30 detects the difference in pressure value when the product A to be tested and the standard sample A ′ are in the same sealed volume in the sealed cavity 12 respectively. When the pressure value difference is within the allowable error range, the air tightness of the product A to be tested is qualified; otherwise, when the pressure value difference is outside the allowable error range, the air tightness of the product A to be inspected is unqualified. The product airtightness detection device 100 has a simple structure and a simple detection method, and can be integrated into an automated production line for automated detection, thereby improving detection efficiency.

Please continue to refer to FIG. 1. In this embodiment, the sealed container 10 is cylindrical, and a piston pipe 14 is formed on the sealed container 10. The pressure generating device 20 includes a piston 22. The piston 22 and the piston pipe 14 are sealed and can be opposed The sealed container 10 moves to change the sealed volume of the sealed cavity 12.

Among them, the sealed container 10 may have a shape such as a straight cylinder shape, an L shape, or an inverted T shape. For example, in the embodiment shown in FIG. 1, the sealed container 10 is L-shaped.

3 is a schematic cross-sectional structural view of another embodiment of the product airtightness detection device shown in FIG. 1. In the embodiment shown in FIG. 3, the sealed container 10 has a straight cylindrical shape, and the sealed container 10 is shared with the piston pipe 14.

4 is a schematic cross-sectional structural view of another embodiment of the product airtightness detection device shown in FIG. 1. In the embodiment shown in FIG. 4, the sealed container 10 has an inverted T shape, and at this time, the two piston pipes 14 are respectively located on opposite sides of the sealed container 10. The pressure generating device 20 includes two, and each pressure generating device 20 includes a piston 22, and each piston 22 is correspondingly accommodated in a piston pipe 14 and sealingly cooperates with the piston pipe 14. When changing the sealing volume of the sealing chamber 12, the two pressure generating devices 20 start and stop moving at the same time.

Of course, in other embodiments, the product airtightness detection device 100 may further include at least three pressure generating devices 20, and the closed container 10 is provided with a piston pipe 14 connected to each pressure generating device 20. At least three pressure generating devices 20 start and stop movement at the same time. The shape of the sealed container 10 may also be other shapes, which are not listed here one by one.

Among them, a scale is also provided on the piston pipe 14. When the piston 22 moves in the piston pipe 14, the position of the piston 22 can be read by a scale to calculate the sealing volume of the sealing chamber 12.

Optionally, as shown in FIG. 2, the pressure generating device 20 includes a motor 24 and a connecting rod 26, the motor 24 is connected to the connecting rod 26, the connecting rod 26 is connected to the piston 22, and the motor 24 is used to drive the piston 22 to move. Wherein, one end of the connecting rod 26 is connected to the motor 24, and can be connected by, for example, a coupling. The other end of the connecting rod 26 is connected to the piston 22, and the rotary motion of the connecting rod 26 can be converted into a linear motion of the piston 22 by, for example, a screw nut pair. Alternatively, the connecting ends of the connecting rod 26 and the piston 22 are respectively provided with a left-hand thread and a right-hand thread. The application does not specifically limit the connection method of the motor 24 and the connecting rod 26 and the connection method of the connecting rod 26 and the piston 22.

In other embodiments, the motor 24 may not be provided, and the reciprocating mechanism may be used to drive the connecting rod 26 to move the connecting rod 26 to move the piston 22.

Optionally, as shown in FIGS. 1 and 2, in this embodiment, the product airtightness detection device 100 further includes a controller 40, which is connected to the pressure generating device 20 and the pressure detection device 30, respectively, for The pressure value sent by the pressure detection device 30 in real time is received and used to control the pressure generating device 20 to change the sealed volume of the sealed chamber 12.

Specifically, the pressure generating device 20 includes a motor 24 and a connecting rod 26. The motor 24 is connected to the controller 40 and the connecting rod 26 is connected to the piston 22. On the one hand, the controller 40 controls the motor 24 to drive the piston 22 to move relative to the sealed container 10, and on the other hand, receives the pressure value in the sealed chamber 12 sent by the pressure detection device 30 in real time, so that the automatic detection of the air tightness of the product A to be detected , Effectively improve the detection efficiency.

In this embodiment, the position information of the piston 22 is fed back to the controller 40 by the position encoder in the motor 24, and the specific position of the piston 22 is checked by the controller 40, so that there is no need to set a scale on the piston pipe 14, further reducing The operation complexity of the product airtightness detection device 100 is described.

Optionally, as shown in FIG. 1, the sealed container 10 is further formed with a sealed port 16, and a sealed door 18 sealingly matched with the sealed port 16 is provided at the sealed port 16, and the sealed door 18 is used to open or close the sealed container 10 To put or take out the product A to be tested.

Specifically, in this embodiment, the product A to be tested is put in and taken out from the sealing port 16. Of course, in other embodiments, when the size of the piston pipe 14 is larger than the product A to be tested, the product A to be tested can also be put in and taken out by the piston pipe 14 to reduce the additional sealing ports 16, sealing doors 18 and others Sealing the components, thereby further reducing the number of components of the product airtightness detection device 100, and improving the airtightness of the product airtightness detection device 100.

The above embodiment introduces the structure of the product air tightness detection device 100, and the following will focus on the method for detecting the product air tightness using the product air tightness detection device 100.

As shown in FIG. 5, FIG. 5 is a schematic flowchart of a method for detecting airtightness of products in an embodiment of the present application. Please also refer to FIGS. 1 and 2. The method for detecting the air tightness of the product in the embodiment of the present application includes the following steps:

S10: The sealed cavity 12 of the closed container 10 receives the product A to be tested and is inserted.

S20: Control that the product A to be tested is in a preset sealed volume.

S30: Control the pressure detection device 30 to detect the pressure value in the sealed chamber 12 when the product A to be detected is in a preset sealed volume.

S40: Determine whether the absolute value of the difference between the pressure value and the standard pressure value is less than or equal to the preset value. If yes, the leak tightness of the product A to be tested is qualified; if not, the leak tightness of the product A to be tested is unqualified.

Among them, the standard pressure value can be determined according to the air tightness level of the product A to be tested. For example, it may be twice or three times the ambient atmospheric pressure.

Further, since the pressure value in the sealed cavity 12 is related to the volume of the sealed cavity 12 and the volume of the product A to be tested, it is necessary to rationally design the volume of the sealed cavity 12 according to the size of the standard pressure value and the volume of the product A to be tested.

In this embodiment, as shown in FIG. 1, the closed container 10 includes a detection chamber 122 and a piston chamber 124 surrounded by a piston pipe 14. Assuming that the maximum allowable volume of the piston chamber 124 is V _A , the volume of the detection chamber 122 is V _B , the volume of the product A to be tested is V _D , the ambient pressure value is P ₀ , and the ideal pressure value is P, then according to the ideal gas state equation PV = NRT, it can be known that the pressure value in the sealed cavity 12 is inversely proportional to the sealed volume of the sealed cavity 12 when the temperature remains unchanged.

When the ideal pressure value takes the minimum value, the volume of the sealed cavity 12 is the largest, at this time:

P _min * (V _A + V _B -V _D ) = P ₀ * (V _B -V _D )

That is, P _min = P ₀ * (V _B -V _D ) / (V _A + V _B -V _D )

When the ideal pressure value takes the maximum value, the volume of the sealed cavity 12 is the smallest, at this time:

P _max * (V _B -V _D ) = P ₀ * (V _A + V _B -V _D )

That is, P _max = P ₀ * (V _A + V _B -V _D ) / (V _B -V _D )

Therefore, the range of the standard pressure value is:

Therefore, the maximum allowable volume V _A of the piston chamber 124 and the volume V _{B of the} detection chamber 122 can be selected according to the size of the standard pressure value P and the volume V _{D of the} product A to be detected.

Wherein, the step of obtaining the preset sealed volume is: placing the standard sample in the sealed container 10, the pressure generating device 20 continuously changes the sealed volume of the sealed cavity 12, when the pressure value detected by the pressure detecting device 30 in the sealed cavity 12 is equal to At the standard pressure value, the sealed volume of the sealed chamber 12 at this time is the preset sealed volume.

Therefore, before performing the airtightness test of the product A to be tested, a standard sample needs to be tested to obtain the preset sealing volume.

As shown in FIG. 6, FIG. 6 is a schematic flow chart of testing a standard sample in an embodiment of the present application. The steps to test the standard sample to obtain the preset seal volume include:

M10: The sealed chamber 12 of the closed container 10 receives the standard sample A 'and places it, and the position of the pressure generating device 20 at this time is recorded as the first position.

M20: Control the pressure generating device 20 to move relative to the sealed container 10 from the first position.

M30: Control the pressure detection device 30 to detect the pressure value in the sealed cavity 12 in real time.

M40: When the pressure value in the sealed chamber 12 is equal to the standard pressure value, the pressure generating device 20 is controlled to stop moving, and the position of the pressure generating device 20 at this time is recorded as the second position.

M50: The pressure generating device 20 is controlled to move from the second position to the first position, and the standard sample A 'is taken out at the first position.

In step M10, the pressure value when the pressure generating device 20 is at the first position is the ambient pressure value. That is, when the pressure value in the sealed chamber 12 is the ambient pressure value, the pressure generating device 20 starts to move relative to the sealed container 10.

Therefore, when the product A to be tested is tested, in step S10, when the product A to be tested is placed in the sealed cavity 12, the pressure value in the sealed cavity 12 should be the ambient pressure value. That is, at the first position, the sealed cavity 12 of the closed container 10 receives the product A to be tested and is inserted.

In step M40, when the pressure generating device 20 is located at the second position, the sealed volume of the sealed chamber 12 is the preset sealed volume.

Please refer to FIG. 7, which is a schematic diagram of a process for controlling a product to be tested to be in a preset sealed volume.

Specifically, in step S20, the step of controlling the product A to be detected to be in a preset sealed volume includes:

S210: Control the pressure generating device 20 to move relative to the sealed container 10 from the first position.

S220: Control the pressure generating device 20 to stop moving when in the second position.

Specifically, in order to make the gas quality of the product A to be tested and the standard sample A ′ in the sealed cavity 12 equal, when the product A to be tested is tested, the product A to be tested is also put into the closed container at the first position In 10, and the pressure generating device 20 also starts to move from the first position and stops moving at the second position, so as to unify the standards and improve the detection efficiency. Since the sealed volume of the sealed cavity 12 is equal to the preset volume in the second position, when the pressure generating device 20 is located in the second position, the product A to be detected is in the preset sealed volume.

In this embodiment, steps S20 and S30 are controlled by the controller 40. The advantage of setting the controller 40 is that it can realize the automation of detection and improve the detection efficiency.

Or in another embodiment, the controller 40 may not be provided, and the movement of the piston 22 may be directly controlled by a motor or a reciprocating mechanism, and a scale is set on the piston pipe 14 to read that the piston 22 is located at the first position and the second position Location coordinates.

As shown in FIG. 5, after the air tightness test of the product A to be tested further includes the following steps:

S50: Control the pressure generating device 20 to move from the second position to the first position.

S60: Control the pressure detection device 30 to detect the pressure value in the sealed cavity 12 in real time.

S70: When the pressure value is equal to the ambient pressure value, the pressure generating device 20 is controlled to stop moving.

Specifically, in step S50, the pressure generating device 20 is controlled to move from the second position toward the first position. During the movement of the pressure generating device 20, the pressure detecting device 30 detects the pressure value in the sealed cavity 12 in real time and sends the pressure value to the controller 40. When the pressure value in the sealed chamber 12 is equal to the ambient pressure value, the controller 40 sends a control signal to the pressure generating device 20, thereby controlling the pressure generating device 20 to stop moving.

After controlling the pressure generating device 20 to stop moving, it also includes the following steps:

S80: Control the sealing door 18 to open to take out the product A to be tested.

S90: Control the pressure generating device 20 to move to the first position relative to the sealed container 10.

In step S80, after the pressure generating device 20 stops moving, the pressure value in the sealed chamber 12 is equal to the ambient pressure value, and the product A to be detected is taken out at this time.

In step S90, after the product A to be tested is taken out, it is necessary to prepare for the next product A to be tested. At this time, the pressure generating device 20 is controlled to move to the first position, the pressure value in the sealed cavity 12 is equal to the ambient pressure, and after the next product A to be tested is placed, the air tightness test of the next product A to be tested can be started .

Further, when comparing the pressure value in the sealed chamber 12 with the standard pressure value when the product A to be tested is in a preset sealed volume, the size of the preset value is related to the air tightness level of the product A to be tested, and the pressure detection device 30 The accuracy is related to the temperature change of the gas in the sealed chamber 12. In this embodiment, the preset value is 5% of the standard pressure value. Of course, in other embodiments, it may be 3% or 8% of the standard pressure value.

In summary, a person skilled in the art can easily understand that when a product airtightness detection device 100 provided by the present application is tested, the product A to be tested is first placed in the sealed cavity 12 of the sealed container 10, and then the pressure is used The generating device 20 compresses the sealed cavity 12 to change the sealed volume of the sealed cavity 12, and further detects the pressure value in the sealed cavity 12 by the pressure detecting device 30, and compares this pressure value with the standard pressure value when the standard sample is in the same sealed volume, In order to judge the tightness of the product A to be tested. The product airtightness detection device 100 in this application has a simple structure and a novel test method, and can be integrated into an automated production line to perform automated detection, thereby effectively improving test efficiency.

The above embodiments are only used to illustrate the technical solutions of the present application, but not 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: The recorded technical solutions are modified, or some of the technical features are equivalently replaced; and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

A product air tightness detection device, characterized in that the product air tightness detection device includes:

A sealed container, a sealed cavity is formed in the sealed container for accommodating the product to be tested;

A pressure generating device connected to the sealed container for moving relative to the sealed container to change the sealed volume of the sealed cavity;

The pressure detection device is provided in the sealed cavity and used for detecting the pressure value in the sealed cavity.
The product airtightness detection device according to claim 1, characterized in that the sealed container has a cylindrical shape, and a piston pipe is formed on the sealed container, and the pressure generating device includes a piston, the piston and The piston pipe fits and can move relative to the sealed container to change the sealed volume of the sealed cavity.
The product airtightness detection device according to claim 2, wherein the sealed container is a straight cylinder, an L shape or an inverted T shape.
The product air tightness detection device according to claim 2, wherein the piston pipe is provided with a scale for reading the position of the piston.
The product air tightness detection device according to claim 2, wherein the pressure generating device further comprises a motor and a connecting rod, the motor is connected to the connecting rod, and the connecting rod is connected to the piston, The motor is used to drive the piston.
The product airtightness detection device according to claim 2, wherein the product airtightness detection device further comprises a controller, and the controller is respectively connected to the pressure generating device and the pressure detection device, It is used to receive the pressure value sent by the pressure detection device in real time, and is used to control the pressure generation device to change the sealed volume of the sealed cavity.
The product airtightness detection device according to claim 6, wherein the pressure generating device further includes a motor and a connecting rod, the motor is connected to the controller, and the connecting rod is connected to the piston, The motor is used to receive the control command of the controller and drive the connecting rod to drive the piston to move.
The device for detecting air tightness of a product according to claim 1, wherein the device for detecting air tightness of a product includes at least two of the pressure generating devices, and each of the pressure generating devices is connected to the sealed container connection.
The product airtightness detection device according to claim 1, characterized in that the hermetic container is further formed with a sealing port, and a sealing door sealingly cooperating with the sealing port is provided at the sealing port, the The sealed door is used to open or close the closed container to put or take out the product to be tested.
A product air tightness detection method for a product air tightness detection device, characterized in that the product air tightness detection method includes:

The sealed cavity of the airtight container receives the product to be tested and is placed;

Controlling the product to be tested to be in a preset sealed volume;

Control the pressure detection device to detect the pressure value in the sealed cavity when the product to be detected is in the preset sealed volume;

It is determined whether the absolute value of the difference between the pressure value and the standard pressure value is less than or equal to a preset value. If yes, the tightness of the product to be tested is qualified, and if not, the tightness of the product to be tested is unqualified.
The method for detecting air tightness of a product according to claim 10, wherein the preset value is 5% of the standard pressure value.
The method for detecting air tightness of a product according to claim 10, wherein when the sealed cavity of the sealed container receives the product to be tested and placed, the pressure value in the sealed cavity is an ambient pressure value.
The method for detecting air tightness of a product according to claim 10, further comprising:

The sealed cavity of the airtight container receives the standard sample, and records the position of the pressure generating device at this time as the first position;

Controlling the pressure generating device to move relative to the closed container from the first position;

Controlling the pressure detection device to detect the pressure value in the sealed cavity in real time;

When the pressure value in the sealed cavity is equal to the standard pressure value, control the pressure generating device to stop moving, and record the position of the pressure generating device at this time as the second position;

The pressure generating device is controlled to move from the second position to the first position, and the standard sample is taken out at the first position.
The method for detecting air tightness of a product according to claim 13, wherein when the pressure generating device is at the first position, the pressure value in the sealed cavity is an ambient pressure value.
The method for detecting air tightness of a product according to claim 14, wherein when the pressure generating device is located at the second position, the sealed volume of the sealed cavity is the preset sealed volume.
The method for detecting air tightness of a product according to claim 15, wherein the step of receiving the product to be tested in the sealed cavity of the sealed container comprises:

When in the first position, the sealed cavity of the closed container receives the product to be tested and placed; the step of controlling the product to be tested at the preset sealed volume includes: controlling the pressure generating device Moving from the first position relative to the closed container;

The pressure generating device is controlled to stop moving when in the second position.
The method for detecting air tightness of a product according to claim 10, wherein the range of the standard pressure value is:

Where, P represents the standard pressure value, P 0 represents the ambient pressure value, V A represents the maximum volume of the sealed cavity, V B represents the minimum volume of the sealed cavity, and V D represents the volume of the product to be tested.
The method for detecting air tightness of a product according to claim 16, further comprising: after performing air tightness inspection on the product to be tested:

Controlling the pressure generating device to move from the second position to the first position;

Controlling the pressure detection device to detect the pressure value in the sealed cavity in real time;

When the pressure value is equal to the ambient pressure value, the pressure generating device is controlled to stop moving.
The method for detecting air tightness of a product according to claim 18, further comprising: after controlling the pressure generating device to stop moving:

Take out the product to be tested;

The pressure generating device is controlled to move to the first position relative to the closed container.