Air tightness testing device

Abstract

The air tightness testing device comprises a guide seat, a movable part, a connecting assembly and a first sealing part, and a first cavity, a second cavity and a first through hole communicated with the first cavity and the second cavity are defined in the air tightness testing device; the movable part is arranged in the first cavity, the movable part is provided with a first airflow channel communicated with the first cavity, and the end, away from the second cavity, of the first airflow channel is communicated with an external air source; the connecting assembly comprises a connecting seat and a connector, one end of the connecting seat extends into the second cavity to be connected with the guide seat, and the connector is arranged in the connecting seat; the first sealing piece is arranged between the connector and the connecting seat, the connecting seat can move under the action of an external air source, and the first sealing piece can be expanded and sealed under the pressure of the connecting seat. According to the technical scheme provided by the embodiment, the expansion of the first sealing element is ingeniously utilized for plugging, so that the sealing surfaces of the sealing elements are ensured to be positioned on the same plane, the sealing performance is better, and the test accuracy is favorably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing equipment, in particular to an airtightness testing device. Background Art

[0002] After the battery pack is manufactured, it is necessary to inflate the battery pack for an airtight test to detect the quality of the finished battery pack. At present, the airtightness test of the battery pack generally uses a one-to-one independent plug for sealing. It is necessary to manually apply glue or place a sealing gasket on the plug before assembling the connector of the battery pack. However, during the test, it is impossible to ensure that the interface of the battery pack connector and the opening of the plug are in the same plane, which can easily lead to poor sealing effect of the sealant or sealing gasket, making it difficult to ensure sealing, thereby causing the possibility of mismeasurement. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides an airtightness testing device.

[0004] The present application provides an airtightness testing device, comprising:

[0005] A guide seat, wherein a first chamber, a second chamber and a first through hole are defined in the interior thereof, wherein the first through hole communicates the first chamber with the second chamber;

[0006] A movable member and a connecting portion, wherein the movable member is disposed in the first chamber, the connecting portion is disposed at one end of the movable member close to the second chamber along the first direction, the second end of the connecting portion passes through the first through hole, the movable member at least partially abuts against the first chamber, and the connecting portion at least partially abuts against the first through hole, so that a closed space is formed between the first chamber and the connecting portion; the movable member is provided with a first air flow channel connected to the first chamber along the first direction, the first air flow channel is located on one side of the first through hole, and one end of the first air flow channel away from the second chamber is connected to an external air source;

[0007] A connecting assembly, comprising a connecting seat and a connecting head, wherein one end of the connecting seat extends into the second chamber and is connected to the guide seat, the connecting head is arranged in the connecting seat, the connecting seat is provided with a second through hole along the first direction, the second end of the connecting portion passes through the second through hole and is fixedly connected to the connecting head;

[0008] The first sealing member is arranged between the connecting head and the connecting seat along a first direction. The connecting seat can move along the first direction under the action of the external gas source, and the first sealing member can expand and seal under the pressure of the connecting seat.

[0009] In one embodiment, it also includes an intake pipe and a control valve, one end of the intake pipe is connected to the first air flow channel, and the other end of the intake pipe is used to be connected to an external air source. The control valve is arranged on the intake pipe to control the opening or closing of the intake pipe.

[0010] In one embodiment, the movable member, the connecting portion and the connecting head are penetrated by a third through hole;

[0011] It also includes an air outlet pipe, a first end of which is connected to the third through hole, and a second end of which is connected to the tester.

[0012] In one embodiment, the third through hole includes a second airflow channel and a connecting hole, the second airflow channel is provided in the connecting portion, the connecting hole is provided in the connecting head, and the second airflow channel and the connecting hole are in communication;

[0013] It also includes a connecting piece, one end of which passes through the connecting hole and is inserted into the second air flow channel to connect the connecting head with the movable part, and a third air flow channel is provided on the connecting piece, and the third air flow channel is used to connect the second air flow channel with the interior of the connecting head.

[0014] In one embodiment, a support ring is provided at one end of the connector away from the second chamber, a mounting groove is formed between the support ring and the connector seat, and the first sealing member is mounted in the mounting groove.

[0015] In one embodiment, a first fixing groove is provided on the outer side surface of the movable member, a second sealing member is installed in the first fixing groove, and the second sealing member abuts against the inner wall of the first chamber.

[0016] In one embodiment, a second fixing groove is provided at one end of the connecting portion extending toward the connecting head, a third sealing member is installed in the second fixing groove, and the third sealing member abuts against an end surface of the connecting head.

[0017] In one embodiment, the connection assembly further includes a positioning seat, the positioning seat is sleeved on the outer side of the connection seat, and a guide cavity is formed between the positioning seat and the connection seat, and the guide cavity is used to guide the movement of the connector.

[0018] In one embodiment, a partition is provided inside the guide seat, and the partition divides the interior of the guide seat into the first chamber and the second chamber. The first through hole is opened in the middle of the partition, and the connecting part extends from the first through hole through the partition into the connecting seat and is connected to the connecting head.

[0019] In one embodiment, a fourth sealing member is provided at the contact point between the partition and the connecting portion.

[0020] Compared with the prior art, the above technical solution provided by the embodiment of the present application has the following beneficial effects:

[0021] The movable part is movably arranged in the first chamber, and the movable part is connected to the connecting head, so that the connecting head can be driven to move in the connecting seat by changing the air pressure in the first chamber, thereby tightening or loosening the first sealing member arranged between the connecting seat and the connecting head. The expansion of the first sealing member is cleverly used for sealing, which ensures that the sealing surfaces of the sealing member are in the same plane, has better sealing performance, and is conducive to improving the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an embodiment of an airtightness testing device of the present application;

[0023] Figure 2 is a cross-sectional schematic diagram of an air tightness testing device of the present application;

[0024] Figure 3 It is a cross-sectional schematic diagram of a guide seat and a movable part in an air tightness test device of the present application;

[0025] Figure 4 A cross-sectional schematic diagram of a guide seat in an air tightness testing device of the present application;

[0026] Figure 5 It is a structural schematic diagram of a movable part and a connecting assembly in an air tightness testing device of the present application;

[0027] Figure 6 It is a structural schematic diagram of another embodiment of an airtightness testing device of the present application;

[0028] Figure 7 It is a structural schematic diagram of an airtightness testing device installed with a connector in the present application.

[0029] Numbers in the figure:

[0030] 10. Guide seat; 10a. First chamber; 10b. Second chamber; 10c. First through hole; 20. Movable part; 20a. First air flow channel; 20b. First fixed groove; 21. Connecting part; 21a. Second air flow channel; 21b. Second fixed groove; 30. Connecting assembly; 31. Connecting seat; 31a. Second through hole; 32. Connecting head; 32a. Connecting hole; 32b. Support ring; 40. First sealing member; 50. Air inlet pipe; 60. Control valve; 70. Air outlet pipe; 80. Connecting member; 80a. Third air flow channel; 90. Second sealing member; 100. Third sealing member; 200. Partition; 300. Fourth sealing member; 400. Mounting groove; 500. Positioning seat; 600. Guide cavity; 700. Connector. DETAILED DESCRIPTION

[0031] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0032] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0033] Please refer to Figure 1 and Figure 2 An embodiment of the present application provides an airtightness testing device, which includes a guide seat 10, a movable part 20, a connecting assembly 30 and a first sealing member 40.

[0034] Specifically, the guide seat 10 defines a first chamber 10a, a second chamber 10b and a first through hole 10c, and the first through hole 10c connects the first chamber 10a and the second chamber 10b. The movable member 20 is arranged in the first chamber 10a, and the end of the movable member 20 close to the second chamber 10b is connected to a connecting portion 21 extending along the first direction X, and the second end of the connecting portion 21 passes through the first through hole 10c. The movable member 20 at least partially abuts the first chamber 10a, and the connecting portion 21 at least partially abuts the first through hole 10c, so that a closed space is formed between the first chamber 10a and the connecting portion 21. The movable member 20 is arranged in the first airflow channel 20a connected to the first chamber 10a along the first direction X, and the first airflow channel 20a is located on one side of the first through hole 10c, and the first airflow channel 20a is far away from the second chamber 10a. 0b is connected to an external air source; the connecting assembly 30 includes a connecting seat 31 and a connecting head 32, one end of the connecting seat 31 extends into the second chamber 10b and is connected to the guide seat 10, the connecting head 32 is arranged in the connecting seat 31, the connecting seat 31 is provided with a second through hole 31a along the first direction X, the second end of the connecting portion 21 passes through the second through hole 31a and is fixedly connected to the connecting head 32; the first sealing member 40 is arranged between the connecting head 32 and the connecting seat 31 along the first direction X, the connecting seat 31 can move along the first direction X under the action of the external air source, and the first sealing member 40 can expand and seal under the pressure of the connecting seat 31.

[0035] Here, it should be noted that the first direction X mentioned above refers to the direction in which the movable member 20 moves in the first chamber 10a when the external gas source passes gas into the first gas flow channel 20a. Figure 1 The X direction in .

[0036] Exemplarily, the first through hole 10c is used to connect the first chamber 10a and the second chamber 10b, so that the connecting portion 21 provided on the movable member 20 can pass through the first through hole 10c and extend into the second chamber 10b to connect with the connector 32. In addition, the first opening and the second opening communicating with the first chamber 10a and the second chamber 10b are respectively provided at opposite ends of the guide seat 10, so that one end of the movable member 20 and the connecting seat 31 can be extended into the first chamber 10a and the second chamber 10b from the first opening and the second opening respectively.

[0037] For example, after the movable part 20 is loaded into the first chamber 10a, the outer surface of the movable part 20 will abut against the inner wall of the first chamber 10a, so that the first chamber 10a forms a sealed state. When the air tightness of the battery pack is tested, gas is introduced into the first airflow channel 20a, so that the gas flows into the first chamber 10a through the first airflow channel 20a, so that the air pressure in the first chamber 10a increases, and then the movable part 20 is driven to move along the first direction. Since the movable part 20 is connected to the connector 32 in the connector seat 31 through the connecting portion 21, the connector 32 can be pulled to move, thereby squeezing or loosening the first sealing member 40.

[0038] In addition, the first air flow channel 20a can be connected to an external air source through an air pipe, so that gas can be introduced into the first chamber 10a at any time as needed, thereby changing the air pressure value in the first chamber 10a to control the movement of the movable part 20. There is no need for manual assembly, and automatic sealing of the connector 700 can be achieved, which is beneficial to improving the sealing performance.

[0039] Exemplarily, the first seal 40 can be connected to the end of the connection seat 31 away from the guide seat 10, and then the movable member 20 is driven to move in the first chamber 10a by changing the air pressure value in the first chamber 10a, thereby pulling the connector 32 to move in the connection seat 31, so that the outer edge of the connector 32 is close to or away from the first seal 40, thereby achieving the compression or loosening of the first seal 40. In other embodiments, the first seal 40 can also be connected to the outer surface of the connector 32, and when the connector 32 is pulled to move in the connection seat 31, the first seal 40 moves accordingly, thereby causing the first seal 40 to be squeezed by the end of the connection seat 31, thereby achieving the compression or loosening of the first seal 40.

[0040] In addition, the first sealing member 40 can be a sealing ring. The material selected for the sealing ring must meet the following requirements: (1) excellent air tightness; (2) appropriate deformation expansion rate; (3) greater friction with the inner wall of the connector 700. Commonly used elastic sealing materials include silicone and rubber. In this embodiment, nitrile rubber is preferred, and some additives need to be added thereto so that the sealing ring has a suitable deformation expansion rate, that is, the selected rubber is not too hard or too soft. If the rubber material is too hard, the deformation amplitude after being subjected to force is very small, which is not enough to fill the gap between the inner wall of the connector 700; if the rubber material is too soft, the friction with the inner wall of the connector 700 is small and it is easy to loosen, resulting in test failure.

[0041] In the air tightness testing device based on the above technical features, the movable part 20 is movably arranged in the first chamber 10a, and the movable part 20 is connected to the connecting head 32, so that the connecting head 32 can be driven to move in the connecting seat 31 by changing the air pressure in the first chamber 10a, thereby realizing the tightening or loosening of the first sealing member 40 arranged between the connecting seat 31 and the connecting head 32, and cleverly utilizing the expansion of the first sealing member 40 for sealing, thereby ensuring that the sealing surfaces of the sealing members are in the same plane, having better sealing performance, and being conducive to improving the accuracy of the test.

[0042] Please refer to Figure 1 In one embodiment, it also includes an intake pipe 50 and a control valve 60, one end of the intake pipe 50 is communicated with the first air flow channel 20a, and the other end of the intake pipe 50 is used to be connected to an external air source. The control valve 60 is arranged on the intake pipe 50 to control the conduction or closure of the intake pipe 50.

[0043] Exemplarily, the control valve 60 is used to control the conduction or closure of the air intake pipe 50, and the amount of gas introduced can be controlled by adjusting the opening of the control valve 60. For example: when the first sealing member 40 needs to be compressed, the control valve 60 is opened so that the external air source enters the first air flow channel 20a through the air intake pipe 50 and flows into the first chamber 10a, which can drive the movable member 20 to move in the first chamber 10a, and then pull the connector 32 to move in the connecting seat 31, until the first sealing member 40 is compressed, so that the first sealing member 40 is deformed and expanded to achieve sealing. At this time, the control valve 60 is kept in a closed state, and then the air tightness of the battery pack is tested. After the test is completed, the control valve 60 is opened to discharge the gas in the first chamber 10a, so that the movable member 20 moves toward the connecting seat 31, and then drives the connector 32 away from the first sealing member 40, thereby releasing the squeezing of the first sealing member 40, which is convenient for replacing another battery pack for testing.

[0044] In addition, it should be noted that the control valve 60 can be automatically controlled by an automatic valve or manually controlled by a manual valve, and this is not limited. In this embodiment, the control valve 60 is a manual sliding valve.

[0045] Please refer to Figure 1 In one embodiment, the movable member 20, the connecting portion 21 and the connecting head 32 are penetrated by the third through hole. An air outlet pipe 70 is also included, a first end of the air outlet pipe 70 is connected to the third through hole, and a second end of the air outlet pipe 70 is connected to the tester.

[0046] Exemplarily, the first end of the air outlet pipe 70 is connected to the third through hole, and the second end of the air outlet pipe 70 is connected to the tester. Since the movable part 20, the connecting part 21 and the connecting head 32 are penetrated by the third through hole, the external gas can be passed into the third through hole through the air outlet pipe 70, and then flow into the battery pack through the third through hole. Finally, the tester is used to observe the change in the air pressure value to determine whether the air tightness of the battery pack meets the requirements. In order to facilitate understanding of the flow state of the gas during the test, the test process is specifically described as follows: First, the tester passes gas into the air outlet pipe 70, so that the gas flows from the third through hole into the connecting head 32 and into the battery pack, and stops inflating after the gas is inflated to a preset value. After that, the tester is used to observe the change in the air pressure value to test the quality of the air tightness; when the test is completed, the gas in the battery pack is discharged from the air outlet pipe 70. The structure is simple and the air tightness test of the battery pack is realized.

[0047] Please refer to Figures 2 to 4 In one embodiment, the third through hole includes a second airflow channel 21a and a connecting hole 32a, the second airflow channel 21a is provided in the connecting portion 21, the connecting hole 32a is provided in the connecting head 32, and the second airflow channel 21a and the connecting hole 32a are communicated. A connecting member 80 is also included, one end of the connecting member 80 passes through the connecting hole 32a and is inserted into the second airflow channel 21a, so that the connecting seat 31 is connected to the movable member 20, and the connecting member 80 is provided with a third airflow channel 80a, and the third airflow channel 80a is used to connect the second airflow channel 21a with the inside of the connecting head 32.

[0048] For example, the connecting member 80 may be a bolt. One end of the bolt is passed through the connecting hole 32a and inserted into the second airflow channel 21a. At this time, the nut of the bolt abuts against the connecting head 32, so that the connecting member 80 and the movable member 20 can be fixedly connected. If the connecting head 32 needs to be removed from the connecting seat 31, only one end of the bolt needs to be pulled out from the second airflow channel 21a to separate the connecting head 32 from the movable member 20. The structure is simple and the disassembly and assembly are convenient.

[0049] In addition, when testing the battery pack, it is necessary to first inflate the battery pack, and then judge the quality of the air tightness of the battery pack by observing the changes in the gas in the battery pack. Therefore, it is necessary to ensure that the gas can be filled into the battery pack. In this embodiment, a second air flow channel 21a communicating with the interior of the connector 32 is provided in the connecting portion 21, and a connecting hole 32a communicating with the second air flow channel 21a is provided in the connector 32, and a third air flow channel 80a is provided on the connector 80, so that when one end of the connector 80 is inserted into the second air flow channel 21a, the air outlet pipe 70, the second air flow channel 21a and the third air flow channel 80a are connected, so that the gas can smoothly pass into the battery pack.

[0050] Please refer to Figure 5 In one embodiment, a support ring 32 b is provided at one end of the connector 32 away from the second chamber 10 b , a mounting groove 400 is formed between the support ring 32 b and the connector seat 31 , and the first sealing member 40 is installed in the mounting groove 400 .

[0051] It should be noted that, in order to securely install the first seal 40 in the installation groove 400, the first seal 40 can be fixed by gluing. Specifically, the surface of the first seal 40 that contacts the connector 32 can be coated with glue, and the seal can be fixed in the installation groove 400 by the glue. Alternatively, the surface of the connector 32 that contacts the first seal 40 can be coated with glue, so that the first seal 40 can be securely fixed on the connector seat 31.

[0052] In one embodiment, the outer side surface of the movable part 20 is provided with a first fixing groove 20b, and a second sealing member 90 is installed in the first fixing groove 20b, and the second sealing member 90 abuts against the inner wall of the first chamber 10a. In this way, by providing the first fixing groove 20b on the outer surface of the movable part 20 and installing the first sealing member 40 in the first fixing groove 20b, after the movable part 20 is installed in the first chamber 10a, the second sealing member 90 can abut against the inner wall of the guide seat 10, which can further ensure that the first chamber 10a forms a sealed state, and avoids air leakage and affecting the sealing effect.

[0053] In one embodiment, a second fixing groove 21 b is provided at one end of the connecting portion 21 extending toward the connecting head 32 , and a third sealing member 100 is installed in the second fixing groove 21 b . The third sealing member 100 abuts against an end surface of the connecting head 32 .

[0054] Exemplarily, since the movable part 20 is connected to the connecting part 80 located in the connecting seat 31 through the connecting part 21, in order to ensure the sealing between the connecting part 21 and the connecting seat 31, in an embodiment of the present application, a second fixed groove 21b is provided at one end of the connecting part 21 extending to the connecting head 32, and a third sealing member 100 is installed in the second fixed groove 21b, so that the third sealing member 100 can be in close contact with the end face of the connecting head 32 to avoid air leakage and affect the sealing effect.

[0055] Please refer to Figure 6 and Figure 7In one embodiment, the connection assembly 30 further includes a positioning seat 500, which is sleeved on the outer side of the connection seat 31, and a guide cavity 600 is formed between the positioning seat 500 and the connection seat 31, and the guide cavity 600 is used to guide the movement of the connector 700. In this way, when the connector 700 is plugged into the connector 32, the connector 700 can be inserted into the connector 32 along the guide cavity 600, so that the connector 700 can be accurately installed, which is conducive to reducing the difficulty of operation.

[0056] In one embodiment, a partition 200 is provided inside the guide seat 10, and the partition 200 divides the inside of the guide seat 10 into a first chamber 10a and a second chamber 10b, and a first through hole 10c is provided in the middle of the partition 200, and the connecting portion 21 passes through the partition 200 from the first through hole 10c and extends into the connecting seat 31 to connect with the connecting head 32. In this way, by using the partition 200 provided inside the guide seat 10, the inside of the guide seat 10 can be divided into the first chamber 10a and the second chamber 10b, and after the movable part 20 is installed in the first chamber 10a, the connecting portion 21 passes through the partition 200 from the first through hole 10c and extends into the inside of the connecting seat 31, so as to facilitate the subsequent connection with the connecting head 32 located in the connecting seat 31.

[0057] In one embodiment, a fourth sealing member 300 is provided at the contact point between the partition 200 and the connecting portion 21. In this way, the sealing between the partition 200 and the connecting portion 21 can be improved, and the gas in the connecting seat 31 is prevented from flowing into the first chamber 10a from the contact point between the partition 200 and the connecting portion 21, resulting in inaccurate airtightness test results.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. An airtightness testing device, characterized in that: include: A guide seat (10), the interior of which defines a first chamber (10a), a second chamber (10b) and a first through hole (10c), wherein the first through hole (10c) communicates with the first chamber (10a) and the second chamber (10b); A movable member (20) and a connecting portion (21), wherein the movable member (20) is arranged in the first chamber (10a), the connecting portion (21) is arranged at one end of the movable member (20) close to the second chamber (10b) along the first direction (X), the second end of the connecting portion (21) passes through the first through hole (10c), the movable member (20) at least partially abuts the first chamber (10a), and the connecting portion (21) at least partially abuts the first through hole (10c), so that a closed space is formed between the first chamber (10a) and the connecting portion (21); the movable member (20) is provided with a first air flow channel (20a) connected to the first chamber (10a) along the first direction (X), the first air flow channel (20a) is located on one side of the first through hole, and the end of the first air flow channel (20a) away from the second chamber (10b) is connected to an external air source; A connecting assembly (30), comprising a connecting seat (31) and a connecting head (32), one end of the connecting seat (31) extends into the second chamber (10b) and is connected to the guide seat (10), the connecting head (32) is arranged in the connecting seat (31), the connecting seat (31) is provided with a second through hole (31a) along the first direction (X), and the second end of the connecting portion (21) passes through the second through hole (31a) and is fixedly connected to the connecting head (32); A first sealing member (40) is arranged between the connecting head (32) and the connecting seat (31) along a first direction (X); the connecting seat (31) is capable of moving along the first direction (X) under the action of the external gas source, and the first sealing member (40) is capable of expanding and sealing under the pressure of the connecting seat (31).

2. The airtightness testing device according to claim 1, characterized in that: It also includes an air intake pipe (50) and a control valve (60), one end of the air intake pipe (50) is in communication with the first air flow channel (20a), and the other end of the air intake pipe (50) is used to be connected to an external air source, and the control valve (60) is arranged on the air intake pipe (50) and is used to control the opening or closing of the air intake pipe (50).

3. The airtightness testing device according to claim 2, characterized in that: The movable member (20), the connecting portion (21) and the connecting head (32) are penetrated by a third through hole; It also comprises an air outlet pipe (70), wherein a first end of the air outlet pipe (70) is connected to the third through hole, and a second end of the air outlet pipe (70) is connected to a tester.

4. The airtightness testing device according to claim 3, characterized in that: The third through hole comprises a second airflow channel (21a) and a connecting hole (32a), wherein the second airflow channel (21a) is arranged in the connecting portion (21), the connecting hole (32a) is arranged in the connecting head (32), and the second airflow channel (21a) and the connecting hole (32a) are in communication; It also includes a connecting member (80), one end of which passes through the connecting hole (32a) and is inserted into the second air flow channel (21a) so that the connecting seat (31) is connected to the movable member (20), and a third air flow channel (80a) is provided on the connecting member (80), and the third air flow channel (80a) is used to connect the second air flow channel (21a) with the interior of the connecting head (32).

5. The airtightness testing device according to claim 1, characterized in that: A support ring (32b) is provided at one end of the connector (32) away from the second chamber (10b), an installation groove (400) is formed between the support ring (32b) and the connector seat (31), and the first sealing member (40) is installed in the installation groove (400).

6. The airtightness testing device according to claim 1, characterized in that: The outer side surface of the movable part (20) is provided with a first fixing groove (20b), a second sealing part (90) is installed in the first fixing groove (20b), and the second sealing part (90) is in contact with the inner wall of the first chamber (10a).

7. The airtightness testing device according to claim 1, characterized in that: A second fixing groove (21b) is provided at one end of the connecting portion (21) extending toward the connecting head (32), a third sealing member (100) is installed in the second fixing groove (21b), and the third sealing member (100) abuts against an end surface of the connecting head (32).

8. The airtightness testing device according to claim 1, characterized in that: The connecting assembly (30) further comprises a positioning seat (500), wherein the positioning seat (500) is sleeved on the outer side of the connecting seat (31), and a guide cavity (600) is formed between the positioning seat (500) and the connecting seat (31), wherein the guide cavity (600) is used to guide the movement of the connector (700).

9. The airtightness testing device according to claim 1, characterized in that: A partition (200) is provided inside the guide seat (10), and the partition (200) divides the interior of the guide seat (10) into the first chamber (10a) and the second chamber (10b). The first through hole is opened in the middle of the partition (200), and the connecting part (21) passes through the partition (200) from the first through hole and extends into the connecting seat (31) to be connected to the connecting head (32).

10. The airtightness testing device according to claim 9, characterized in that: A fourth sealing member (300) is provided at the contact point between the partition (200) and the connecting portion (21).

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