Air tightness detection device

Abstract

The utility model belongs to the technical field of automobile water tank water chamber detection, and provides an air tightness detection device which comprises an air inlet module, a reference module and a differential pressure detection module, the air inlet module is used for introducing air into the reference module and an external detected object, the air inlet module is provided with a valve which is connected and disconnected with the detected object, and the differential pressure detection module is connected with the reference module. The differential pressure detection module is used for detecting the air pressure difference between the reference module and a detected object. The air inlet module is further provided with a closable port which is connected with an external container. When the port is connected with the external container, the differential pressure detection module can detect the air pressure difference between the sum of the air pressure of the reference module and the external container and the detected object. According to the utility model, air tightness detection of external detected objects with different volumes is completed by using the openable and closable ports on the air inlet module, so that the air tightness detection accuracy of the differential pressure detection module can be improved, the air tightness detection of products with large and small volumes can also be considered, and the compatibility of the device is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile water tank water chamber detection, and specifically relates to an airtightness detection device. Background Art

[0002] CN202123321963.6 discloses an airtightness detector integrating direct pressure and differential pressure, which includes a main air path, a measured object air path, a reference object air path and a deflation air path. The measured object air path and the reference object air path are arranged in parallel and are respectively connected to the main air path. A deflation air path is also connected to the main air path. An air pump and an intake valve are arranged on the main air path, a reference object valve is arranged on the reference object air path, and a deflation valve is arranged on the deflation air path. By simultaneously compatible with differential pressure testing and direct pressure testing, and using the structural design of mutual switching between differential pressure and direct pressure modes, users can complete the testing of measured objects of multiple types and standards by selecting parameters such as test mode and test pressure.

[0003] In the above technical solution, by combining the direct pressure mode and the direct pressure mode and using two types and ranges of airtightness detectors for testing, the problem of compatibility between the airtightness detector and the measured object is solved. However, when testing in the differential pressure mode in the above technical solution, since the volume of the reference object is fixed, when it is necessary to detect a product with a volume larger than that of the reference object in the differential pressure mode, the reference object cannot match the volume of the product, affecting the accuracy of the detection. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the above problems, and provides an airtightness detection device. The device completes the airtightness detection of external measured objects with different volumes by using the openable and closable ports on the intake module, which can not only improve the accuracy of the differential pressure detection module for detecting airtightness, but also take into account the airtightness detection of products with large and small volumes, improving the compatibility of the device.

[0005] To achieve the above purpose, the utility model provides the following technical solution:

[0006] An airtightness detection device includes an intake module, a reference module and a differential pressure detection module. The intake module is used to introduce gas into the reference module and the external measured object. A valve for connecting and disconnecting with the measured object is arranged on the intake module. The differential pressure detection module is used to detect the air pressure difference between the reference module and the measured object. A closable port is also arranged on the intake module to connect an external container; when the port is connected to the external container, the differential pressure detection module can detect the air pressure difference between the sum of the air pressures of the reference module and the external container and the measured object.

[0007] Compared with the prior art, the beneficial effects of the utility model are:

[0008] In the present utility model, when using the differential pressure mode, a closable port is provided on the intake module. When detecting some peripherals to be measured with a relatively small volume, the port is closed, and the differential pressure detection module is used to detect the airtightness of the peripherals to be measured. When it is necessary to detect some peripherals to be measured with a large volume, the port is opened, and an external peripheral container is connected. In this way, the external peripheral container will be connected to the reference module, so as to form a reference object with a volume equivalent to that of the peripherals to be measured for comparison with the peripherals to be measured. This can not only improve the accuracy of the differential pressure detection module in detecting airtightness, but also take into account the airtightness detection of products with large and small volumes, improving the compatibility of the device. Description of the Drawings

[0009] Figure 1 is a perspective view of an airtightness detection device according to Embodiment 1;

[0010] Among them, the reference numerals in each figure:

[0011] 1. Intake module; 11. Main pipeline; 111. Port; 12. Valve; 13. Pipeline to be measured; 131. Direct pressure sensing device; 14. Air supply unit; 141. Air supply pipeline; 2. Reference module; 21. Air tank; 3. Differential pressure detection module; 31. Differential pressure sensor; 4. First solenoid valve; 5. Second solenoid valve; 6. Exhaust pipe; 7. Third solenoid valve. Detailed Embodiment

[0012] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0013] Embodiment 1

[0014] Refer to Figure 1 , an airtightness detection device, including an intake module 1, a reference module 2, and a differential pressure detection module 3. The intake module 1 is used to introduce gas into the reference module 2 and the peripherals to be measured. A valve 12 for connecting and disconnecting with the object to be measured is provided on the intake module 1. The differential pressure detection module 3 is used to detect the air pressure difference between the reference module 2 and the object to be measured. A closable port 111 is also provided on the intake module 1 to connect an external peripheral container; when the port 111 is connected to the external peripheral container, the differential pressure detection module 3 can detect the air pressure difference between the sum of the air pressures of the reference module 2 and the container and the object to be measured.

[0015] In this design, when it is necessary to measure a product with a small volume, valve 12 is opened, port 111 on intake module 1 is closed, and then intake module 1 supplies gas to the external device under test and reference module 2 for a period of time. After that, intake module 1 stops supplying gas and closes valve 12, maintains pressure for a period of time, and then observes the verticality of differential pressure detection module 3 to determine whether the airtightness of the external device under test is intact. When it is necessary to detect an external device under test with a larger volume, port 111 is opened, and port 111 of intake module 1 is connected to the external container, so that the external container will be connected to reference module 2. Then valve 12 is opened, and intake module 1 supplies gas to allow the gas to enter reference module 2, the external container, and the external device under test. After supplying gas for a period of time, it stops, valve 12 is closed, and after maintaining pressure for a period of time, the value of differential pressure detection module 3 is observed to determine whether the airtightness of the external device under test is intact.

[0016] Preferably, intake module 1 includes main pipeline 11, a pipeline 13 for the device under test that is connected to main pipeline 11, and a gas supply unit 14 for supplying gas to main pipeline 11. The closable port 111 is provided on main pipeline 11. Pipeline 13 for the device under test is used to connect to the external device under test. Valve 12 is provided on pipeline 13 for the device under test. One end of reference module 2 is connected to main pipeline 11 in a way that can be switched on and off, and the other end is connected to one end of differential pressure detection module 3. The other end of differential pressure detection module 3 is connected to pipeline 13 for the device under test.

[0017] Specifically, when detecting airtightness, pipeline 13 for the device under test is connected to the external device under test, port 111 is closed, and valve 12 is opened to control gas supply unit 14 to supply gas to main pipeline 11. During the gas supply process, the gas in main pipeline 11 goes in both directions. One side passes through pipeline 13 for the device under test and then enters the external device under test, and the gas on the other side enters reference module 2. After supplying gas for a period of time, valve 12 is closed to maintain pressure. After maintaining pressure for a period of time, the value of differential pressure detection module 3 is observed to determine whether the airtightness of the external device under test is intact. When detecting an external device under test with a larger volume, the operation steps are similar to the above, but port 111 needs to be opened and port 111 is connected to the external volume.

[0018] In this embodiment, gas supply unit 14 includes a gas supply pipeline 141 for connecting to an external gas supply device. The gas supply pipeline 141 and main pipeline 11 are connected and disconnected through a first solenoid valve 4.

[0019] Furthermore, the gas supply pipeline is connected to an external gas supply device. When supplying gas, the first solenoid valve 4 is opened to connect the gas supply pipeline 141 and main pipeline 11. After completing the gas supply, the first solenoid valve 4 is closed to disconnect main pipeline 11 and gas supply pipeline 141.

[0020] Preferably, the reference block 2 includes a gas tank 21. One end of the gas tank 21 is connected to the main pipeline 11, and the other end is connected to the differential pressure detection module 3. When the air supply unit 14 supplies air to the main pipeline 11, the gas will flow into the gas tank 21. In this way, the differential pressure detection module 3 can be used to compare the gas tank 21 with the external device to be measured, so as to judge whether the air tightness of the external device to be measured is intact.

[0021] Preferably, a direct pressure sensing device 131 is provided on the intake module 1. The connection between the reference module 2 and the intake module 1 is switched on and off by a second solenoid valve 5. When it is necessary to detect the external device to be measured in the way of direct pressure, the connection between the intake module 1 and the reference module 2 is disconnected by using the second solenoid valve 5, the valve 12 is opened and the port 111 is closed. Then the intake module 1 supplies air to the external device to be measured. After supplying air for a period of time, the valve 12 is closed to maintain pressure for a period of time, and the direct pressure sensing device 131 is observed to judge whether the air tightness of the external device to be measured is intact.

[0022] More preferably, a pressure gauge (not shown in the figure) is further provided on the main pipeline 11. The provision of the pressure gauge can facilitate the workers to observe the air pressure value.

[0023] In this embodiment, an exhaust pipe 6 is further included. The connection between the exhaust pipe 6 and the main pipeline 11 is switched on and off by a third solenoid valve 7.

[0024] Specifically, when detecting an external device to be measured with a small volume, the port 111 does not need to be connected to the external container. After the air tightness detection of the external device to be measured with a small volume is completed, when the pressure is maintained for a period of time and it is found that the external device to be measured with poor air tightness needs to be reworked, the valve 12, the third solenoid valve 7 and the port 111 are opened to allow the gas in the external device to be measured and the gas tank 21 to flow out. Then the port 111 and the third solenoid valve 7 are closed and the connection between the reference module 2 and the main pipeline 11 is disconnected. The valve 12 is opened, and the air supply unit 14 is controlled to supply air so that the external device to be measured is filled with pressure. Then the product is placed in water to mark the electric leakage for subsequent rework.

[0025] Preferably, the differential pressure detection module 3 includes a differential pressure sensor 31. One end of the differential pressure sensor 31 is connected to the intake module 1, and the other end is connected to the reference module 2. The differential pressure sensor 31 is used to detect flexible, fragile or deformable external devices to be measured.

[0026] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements or deformations can be made, and these improvements or deformations should also be regarded as the protection scope of the present invention.

Claims

1. An airtightness detection device, characterized in that: It includes an air intake module, a reference module, and a differential pressure detection module. The air intake module is used to pass gas into the reference module and the external object to be measured. The air intake module is provided with a valve that is connected and disconnected with the object to be measured. The differential pressure detection module is used to detect the air pressure difference between the reference module and the object to be measured. The air intake module is also provided with a closable port to connect to an external container; when the port is connected to the external container, the differential pressure detection module can detect the air pressure difference between the sum of the air pressures of the reference module and the external container and the object to be measured.

2. The airtightness detection device according to claim 1, characterized in that: The air intake module includes a main pipeline, a measured pipeline connected to the main pipeline, and an air supply unit for supplying air to the main pipeline. The port is arranged on the main pipeline, the measured pipeline is used to be connected to an external measured object, and the valve is arranged on the measured pipeline. One end of the reference module is connected to the main pipeline in a switchable manner, and the other end is connected to one end of the differential pressure detection module. The other end of the differential pressure detection module is connected to the measured pipeline.

3. The airtightness detection device according to claim 2, characterized in that: The air supply unit comprises an air supply pipeline for connecting to an external air supply device, and the air supply pipeline and the main pipeline are connected and disconnected by a first solenoid valve.

4. The airtightness detection device according to claim 2, characterized in that: The reference module comprises a gas tank, one end of which is connected to the main pipeline, and the other end of which is connected to the differential pressure detection module.

5. The airtightness detection device according to claim 1, characterized in that: It also includes a direct pressure sensor device arranged on the air intake module, and the reference module and the air intake module are connected and disconnected by a second solenoid valve.

6. The airtightness detection device according to claim 2, characterized in that: The main pipe is also provided with a pressure gauge.

7. The airtightness detection device according to claim 2, characterized in that: It also includes an exhaust pipeline, and the exhaust pipeline and the main pipeline are connected and disconnected by a third solenoid valve.

8. The airtightness detection device according to claim 1, characterized in that: The differential pressure detection module includes a differential pressure sensor, one end of which is connected to the air intake module, and the other end of which is connected to the reference module.

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