Air tightness testing device
By designing an airtightness test device, and using high-pressure air and air pressure gauge to automatically detect the valve sealing, the problems of low water immersion detection efficiency and insufficient accuracy in the prior art are solved, and efficient and accurate valve airtightness detection is achieved.
Patent Information
- Application Number
- CN202422769040.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-14
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-11-14
AI Technical Summary
The airtightness detection of existing valves requires immersion in water, increasing the drying process, reducing production efficiency and detection accuracy, and relying on manual operations is prone to errors.
A airtightness test device is designed to inject high-pressure air into the valve channel through a fixture and a sealing device, and use a gas pressure gauge to observe the air pressure changes to judge leakage. Combined with the opening and closing motor and driving mechanism to achieve automatic detection, simulating the sealing of the valve under different states.
The valve sealing can be detected without immersing in water, improving detection efficiency and accuracy, reducing costs, avoiding manual errors, and detecting smaller leaks.
Smart Images
Figure CN223259187U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of valve detection, and in particular relates to an air tightness testing device. Background Art
[0002] After the valve is assembled, it is necessary to test the air tightness of the valve to ensure that it will not leak during use and to ensure the quality of the valve. Water immersion testing is usually used to test the air tightness of the valve. Specifically, the product is immersed in water, and then high-pressure gas is injected into the valve to observe whether there are bubbles around the valve. If there are bubbles, it means there is a leak. In order to more comprehensively understand the sealing performance of the valve and ensure that the valve can operate reliably under different working conditions, the valve needs to be immersed in water for air tightness testing in the fully open, fully closed, and half-open states to ensure that there are no sealing problems in the different working states of the valve. However, the valve needs to be dried after the water immersion test, which increases the production process, reduces production efficiency, and increases production costs. In addition, the valve needs to be manually set to the fully open, fully closed, and half-open states during the testing process, which has low detection efficiency. The valve testing relies on manual experience and is prone to detection errors.
[0003] Therefore, the above problems need to be solved urgently. Utility Model Content
[0004] Purpose of the utility model: In order to overcome the above shortcomings, the utility model provides an airtightness testing device, which does not require the valve to be immersed in water for sealing detection, reduces the subsequent drying process, improves detection efficiency, reduces detection costs, and judges whether the valve is leaking by observing the air pressure changes during the detection process. Compared with observing bubbles with the human eye, it can detect smaller leaks, improve detection accuracy, avoid detection errors caused by valve assembly problems, and improve detection accuracy.
[0005] Technical solution: In order to achieve the above-mentioned purpose, the utility model provides an air tightness testing device, including a fixing frame, the fixing frame is connected to a valve, the valve is provided with a channel for fluid to pass through, and the valve channel includes a first channel and a second channel. The fixing frame is connected to the bracket, and the above-mentioned bracket is connected to a first sealing device and a second sealing device, the first sealing device seals the first channel, and the second sealing device seals the second channel. High-pressure air is introduced into the first channel through the first sealing device, and high-pressure air is introduced into the second channel through the second sealing device to detect the air tightness of the valve. The valve is provided with a second channel with a hollow stud connected to one end, the hollow stud and the valve are threadedly connected, the second channel is arranged along the axis of the hollow stud, the second sealing device and the hollow stud are driven and connected, and the second sealing device is rotated to lock the hollow stud.
[0006] During the test, connect the valve to the fixed frame, connect the first and second sealing devices to the first and second channels respectively, and then fully close the valve. Then turn on the air compressor, which injects high-pressure air into the first and second channels through the air passages provided in the first and second sealing devices. When the air pressure reaches the set value, turn off the air compressor, let it stand for a while, and observe the changes in the pressure gauge on the air pipe. If the pressure gauge shows a decrease in pressure, the valve is leaking. If the pressure gauge value does not change, open the valve halfway, so that the valve is in a half-open state, and maintain the pressure for a while, and observe the changes in the pressure gauge value to check the sealing of the valve in the half-open state. If the pressure gauge value does not change after the valve is in the half-open state for a certain period of time, rotate the valve to the fully open state, maintain the pressure for a certain period of time, and observe the changes in the pressure gauge value to check the sealing of the valve in the fully open state. If leakage is found in any of the above steps, the second sealing device is rotated to lock the hollow stud to the maximum locking force and then retest. If there is still leakage, the product is unqualified. If there is no leakage, the next test is carried out. If no leakage is detected after the above three tests, the valve is qualified, otherwise it is unqualified. The utility model can perform sealing detection on the valve without immersing the valve in water, which reduces the subsequent drying process, improves the detection efficiency, reduces the detection cost, and judges whether the valve has a leak by observing the change in the pressure gauge value during the detection process. Compared with observing bubbles with the human eye, it can detect smaller leaks and improve the detection accuracy. At the same time, by rotating the second sealing device to lock the hollow stud to the maximum locking force and then retesting during the detection process, it can avoid detection errors caused by valve assembly problems and improve detection accuracy.
[0007] Furthermore, in the above-mentioned air tightness testing device, the valve includes a valve body, a valve core connected to the valve core, a valve stem connected to the valve core, and the valve stem extending out of the valve body. The valve core is provided with a through hole, and the two ends of the valve core are respectively connected to the first channel and the second channel. Rotating the valve stem drives the valve core to rotate and connect the first channel and the second channel. The first channel and the second channel are provided at both ends of the valve body, the hollow stud is threadedly connected to the valve body, the hollow stud and the valve core are tightly connected via a first sealing ring, the valve core and the second channel are tightly connected via a second sealing ring, and the valve stem is tightly connected to the valve body via a valve stem sealing ring. The valve has a first sealing ring, a second sealing ring, and a valve stem sealing ring, and one or more valve stem sealing rings are provided to ensure that the valve has good sealing performance in fully open, fully closed, and half-open states. When the valve stem rotates, the valve core isolates the first channel and the second channel, the valve closes, and the sealing performance of the first sealing ring and the second sealing ring is tested. Rotating the valve stem and valve core connects the first and second channels, placing the valve in a semi-open state. This test checks the sealing performance of the first and second sealing rings, as well as the stem seal, during valve operation. Rotating the valve core fully opens the valve and tests the sealing performance of the first, second, and stem seals. This simulates the valve's operating state and performs a step-by-step test of the sealing performance of the first, second, and stem seals, improving test quality and reducing test errors.
[0008] Furthermore, in the aforementioned air tightness testing device, a switching motor is connected to the fixed frame, and the motor shaft of the switching motor is drivably connected to the valve stem. The switching motor drives the valve stem to rotate, thereby controlling the opening and closing of the valve. The switching motor drives the valve opening and closing, making the test fully automated, reducing workload and avoiding errors caused by manual operation. The switching motor automatically controls the opening and closing of the valve, thereby improving test efficiency.
[0009] Furthermore, in the above-mentioned airtightness testing device, the first sealing device includes a cylinder, the cylinder is connected to the bracket, the cylinder shaft of the cylinder is connected to a sealing ring, the cylinder shaft of the cylinder extends into the first channel, and the cylinder shaft of the cylinder is sealed and connected to the first channel. The cylinder shaft is provided with a first through hole, the first through hole is connected to the first channel, and the first through hole is connected to the air pipe. During testing, the cylinder is started, the cylinder shaft extends into the first channel, the cylinder shaft of the cylinder is sealed and connected to the first channel, the air compressor is turned on, and high-pressure air is injected into the first channel through the air pipe connected to the first through hole. The air pipe is connected to a pressure gauge, and the automatically controlled cylinder can automatically be sealed and connected to the first through hole, thereby improving the automation of the test.
[0010] Furthermore, in the aforementioned airtightness testing device, the second sealing device includes a column, one end of which abuts against one end of a second passage provided in the valve, and a plug is provided at the end of the column abutting against the second passage, the plug being connected to a sealing ring, the plug extending into the second passage, and the plug and the second passage being airtightly connected. The second sealing device is drivably connected to a drive mechanism. During testing, the drive mechanism drives the second sealing device toward the valve, the plug extending into the second passage, and the plug and the second passage are formed into an airtight connection. The control system controls the operation of the drive mechanism, and thereby controls the second sealing device, thereby improving the automation of testing.
[0011] Furthermore, in the aforementioned air tightness testing device, a slot is provided at one end of the hollow stud away from the valve core. A boss is provided at the end where the plug abuts the valve. The boss snaps into the slot, and the rotating cylinder drives the hollow stud to rotate. If a leak is detected during the test, the drive device drives the cylinder to rotate, which in turn drives the hollow stud to rotate. The drive device is provided with a torque detection device. When the torque detected by the torque detection device reaches a set value, the drive device stops rotating, tightening the hollow stud until the hollow stud reaches the maximum locking torque, thereby preventing leakage caused by the hollow stud not being tightened during assembly.
[0012] Furthermore, in the above-mentioned air tightness testing device, the cylinder is provided with a through hole, which is configured as a countersunk through hole. The countersunk portion of the through hole is provided on the side of the cylinder close to the valve. An elastic ejector pin is connected to the through hole. A fixed plate is connected to the end of the cylinder away from the valve. The elastic ejector pin and the fixed plate are slidably connected. A boss is provided at the end of the elastic ejector pin away from the fixed plate. The elastic ejector pin dampens movement along the axis of the through hole. During testing, the cylinder and the valve abut against each other. If the boss is not engaged in the slot, the boss is squeezed by the valve, the elastic ejector pin moves away from the valve, and the boss retracts into the through hole. When the hollow stud needs to be tightened, the driving mechanism drives the cylinder to rotate. When the boss moves to the slot position, the elastic ejector pin pushes the boss into the slot, and the cylinder continues to rotate to tighten the hollow stud. The above-mentioned mechanism eliminates the need to align the boss and the slot during testing, thus achieving automated testing and improving testing efficiency.
[0013] Furthermore, in the aforementioned airtightness testing device, the elastic ejector includes an ejector pin and a spring disposed around the ejector pin. The end of the ejector pin away from the fixed plate is connected to a limiting portion, the limiting portion having a diameter greater than the diameter of the ejector pin. One end of the spring abuts the fixed plate, while the end of the spring away from the fixed plate abuts the limiting portion. The limiting portion is provided on the sidewall of the limiting portion, and the column is provided with a slide groove corresponding to the limiting pin, within which the column slides. When the elastic ejector pin moves away from the valve, the limiting portion squeezes the spring; when the boss moves to the slot position, the spring pushes the boss into the slot, and the column slides within the slide groove, preventing the boss from rotating, improving positioning accuracy, and providing conditions for automated testing.
[0014] Furthermore, in the airtightness testing device, the plug is provided with a second through hole, which passes through the column and is connected to an air pipe. The air pipe connected to the second through hole is connected to an air compressor, and a pressure gauge is connected to the air pipe, so that leakage can be determined by observing the changes in the pressure gauge value.
[0015] Furthermore, in the aforementioned airtightness testing device, the mounting bracket has a mounting position, the valve is connected to the mounting position, the mounting position is laterally open, and includes a bottom, a side, and a top. The valve has a first passageway, one end of which abuts the side, and the first sealing device extends through a through hole in the side and is sealedly connected to the first passageway. The top has a notch, into which the valve stem engages, and the notch opening is located on the side of the valve stem away from the side. The bottom of the valve abuts the bottom.
[0016] As can be seen from the above technical solution, the present invention has the following beneficial effects: The present invention's airtightness testing device can test the valve's tightness without immersing it in water, reducing the subsequent drying process, improving testing efficiency, and lowering testing costs. Furthermore, by observing changes in the pressure gauge value, the device can detect even smaller leaks than the human eye can detect bubbles, thereby improving testing accuracy. Furthermore, during the testing process, by rotating the second sealing device to tighten the hollow stud to its maximum tightening force and then retesting, it can avoid testing errors caused by valve assembly problems and improve testing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a front view of the air tightness testing device of the utility model;
[0018] Figure 2 is a cross-sectional view of the valve;
[0019] Figure 3 is a schematic structural diagram of the first sealing device;
[0020] Figure 4 is a schematic structural diagram of the second sealing device;
[0021] Figure 5 Schematic diagram of the structure of the fixing frame.
[0022] In the figure: 1. fixing frame, 10. opening and closing motor, 11. mounting position, 111. bottom, 112. side, 113. top, 1131. notch, 2. valve, 21. first channel, 22. second channel, 221. hollow stud, 2211. slot, 222. first sealing ring connection, 223. second sealing ring, 224. valve stem sealing ring, 23. valve body, 24. valve core, 25. valve stem, 3. first sealing device, 31. cylinder, 32. first through hole, 4. second sealing device, 41. column, 411. through hole, 412. elastic ejector pin, 4121. ejector pin, 4122. spring, 4123. limiting part, 4124. limiting column, 413. fixing plate, 414. slide groove, 42. plug, 421. boss, 422. second through hole. DETAILED DESCRIPTION
[0023] Example 1
[0024] like Figure 1-2 An air tightness testing device shown includes a fixing frame 1, to which a valve 2 is connected. The valve 2 includes a channel for fluid to pass through, and the channel of the valve 2 includes a first channel 21 and a second channel 22. The fixing frame 1 is connected to a bracket, and the bracket is connected to a first sealing device 3 and a second sealing device 4. The first sealing device 3 seals the first channel 21, and the second sealing device 4 seals the second channel 22. High-pressure air is introduced into the first channel 21 through the first sealing device 3, and high-pressure air is introduced into the second channel 22 through the second sealing device 4 to test the air tightness of the valve 2. The valve 2 is provided with a second channel 22, one end of which is connected to a hollow stud 221. The hollow stud 221 is threadedly connected to the valve 2. The second channel 22 is arranged along the axis of the hollow stud 221. The second sealing device 4 is drivingly connected to the hollow stud 221, and the hollow stud 221 is locked by rotating the second sealing device 4. The fixing frame 1 is connected to the opening and closing motor 10, and the motor shaft of the opening and closing motor 10 is drivingly connected to the valve stem 25. The opening and closing motor 10 drives the valve stem 25 to rotate and control the opening and closing of the valve 2.
[0025] During the inspection, the valve 2 is connected to the fixing frame 1, and the first sealing device 3 and the second sealing device 4 are sealed and connected to the first channel 21 and the second channel 22 respectively. Then the opening and closing motor 10 is started to drive the valve 2 to the fully closed state. Then the air compressor is turned on. The air compressor injects high-pressure air into the first channel 21 and the second channel 22 through the air passages provided in the first sealing device 3 and the second sealing device 4 respectively. When the air pressure reaches the set value, the air compressor is turned off and left to stand for a period of time. The changes in the value of the barometer on the air pipe are observed. If the pressure gauge shows a decrease in pressure, the valve is leaking. If the pressure gauge value does not change, the opening and closing motor 10 is started to drive the valve 2 to open halfway, so that the valve 2 is in a half-open state, and the pressure is maintained for a period of time. The changes in the pressure gauge value are observed to check the sealing of the valve 2 in the half-open state. If the pressure gauge reading on valve 2 remains unchanged after maintaining pressure in the half-open state for a specified period, the opening and closing motor 10 is activated to rotate valve 2 to the fully open state and maintain pressure for a specified period. The pressure gauge reading is then observed to check the tightness of valve 2 in the fully open state. If leakage is detected during any of the above steps, the drive mechanism is activated, which rotates the second sealing device 4 to tighten the hollow stud 221 to the maximum tightening force and then retests. If leakage persists, the product is deemed unqualified. If no leakage is detected, the next test is performed. If no leakage is detected after all three tests, the valve is deemed qualified; otherwise, it is deemed unqualified.
[0026] like Figure 2In the air tightness testing device shown, valve 2 includes a valve body 23, within which is connected a valve core 24, which is in turn connected to a valve stem 25. The valve stem 25 extends beyond the valve body 23. The valve core 24 is provided with a through hole, and its ends are connected to a first channel 21 and a second channel 22, respectively. Rotating the valve stem 25 drives the valve core 24 to connect the first channel 21 and the second channel 22. The first channel 21 and the second channel 22 are provided at either end of the valve body 23. A hollow stud 221 is threadedly connected to the valve body 23. The hollow stud 221 and the valve core 24 are hermetically connected via a first sealing ring 222. The valve core 24 and the second channel 22 are hermetically connected via a second sealing ring 223. The valve stem 25 is hermetically connected to the valve body 23 via a stem sealing ring 224. Valve 2 has a first sealing ring 222, a second sealing ring 223, and a stem sealing ring 224. One or more stem sealing rings 224 are provided to ensure good sealing performance in the fully open, fully closed, and partially open positions. When the valve stem 25 rotates, the valve core 24 isolates the first and second channels 21 and 22, closing the valve. The sealing performance of the first and second sealing rings 222 and 223 is then tested. Rotating the valve stem 25 and valve core 24 connects the first and second channels 21 and 22, placing the valve 2 in the partially open position. The sealing performance of the first and second sealing rings 222 and 223, as well as the stem sealing ring 224, is then tested. This test is performed during valve operation. Rotating the valve core 24 fully opens the valve, and the sealing performance of the first and second sealing rings 222 and 223, as well as the stem sealing ring 224, is then tested. Simulating the operating state of valve 2, the sealing performance of the first and second sealing rings 222 and 223, as well as the stem sealing ring 224, is then tested step by step.
[0027] like Figure 3 The airtightness testing device shown in the figure has a first sealing device 3 including a cylinder 31, which is connected to a bracket, a cylinder shaft of the cylinder 31 connected to a sealing ring, and a cylinder shaft of the cylinder 31 extending into the first channel 21, and the cylinder shaft of the cylinder 31 and the first channel 21 are sealed. The cylinder shaft of the cylinder 31 is provided with a first through hole 32, which is in communication with the first channel 21, and the first through hole 32 is connected to the air pipe. During testing, the cylinder 31 is started, the cylinder shaft of the cylinder 31 extends into the first channel 21, and the cylinder shaft of the cylinder 31 and the first channel 21 are sealed. The air compressor is turned on, and high-pressure air is injected into the first channel 21 through the air pipe connected to the first through hole 32. The air pipe is connected to a pressure gauge, and the automatically controlled cylinder 31 and the first through hole 32 are sealed.
[0028] like Figure 4In the airtightness test device shown, the second sealing device 4 includes a cylinder 41. One end of the cylinder 41 abuts against the end of the second passage 22 of the valve 2. A plug 42 is provided at the end where the cylinder 41 and the second passage 22 meet. The plug 42 is connected to a sealing ring and extends into the second passage 22, forming a sealed connection between the plug 42 and the second passage 22. A hollow stud 221 has a slot 2211 at the end away from the valve core 24. The end where the plug 42 abuts the valve 2 has a boss 421. The boss 421 engages the slot 2211, and rotating the cylinder 41 drives the hollow stud 221 to rotate. Cylinder 41 has a through-hole 411, which is a countersunk through-hole. The countersunk portion of through-hole 411 is located on the side of cylinder 41 near valve 2. An elastic ejector pin 412 is connected to through-hole 411. A fixing plate 413 is connected to the end of cylinder 411 away from valve 2. Elastic ejector pin 412 and fixing plate 413 are slidably connected. A boss 421 is located on the end of elastic ejector pin 412 away from fixing plate 413. Elastic ejector pin 412 dampens movement along the axis of through-hole 411. Elastic ejector pin 412 includes an ejector pin 4121 and a spring 4122 disposed around ejector pin 4121. The end of ejector pin 4121 away from fixing plate 413 is connected to a limiter 4123, which has a larger diameter than that of ejector pin 4121. One end of spring 4122 abuts against fixing plate 413, while the end of spring 4122 away from fixing plate 413 abuts against limiter 4123. The side wall of the limiting portion 4123 is provided with a limiting post 4124, and the column 41 is provided with a slide groove 414 corresponding to the limiting post 4124, and the column 41 slides in the slide groove 414. The plug 42 is provided with a second through hole 422, which passes through the column 41 and is connected to the air pipe, and the air pipe is connected to a pressure gauge.
[0029] The second sealing device 4 is connected to the driving mechanism. During testing, the driving mechanism drives the second sealing device 4 to move toward the valve 2, and the plug 42 extends into the second passage 22. The plug 42 and the second passage 22 are sealed. The column 41 abuts the valve 2. If the boss 421 is not engaged in the slot 2211, the boss 421 is squeezed by the valve 2, and the elastic ejector 412 moves away from the valve 2. The boss 421 retracts into the through hole 411, and the limiter 4123 squeezes the spring 4122, causing the column 41 to slide in the slide slot 414 away from the valve 2. If leakage is found after detection, the driving device drives the column 41 to rotate. When the boss 421 moves to the position of the slot 2211, the elastic ejector 412 pushes the boss 421 to fit into the slot 2211. The column 41 slides in the slide groove 414 toward the valve 2. The column 41 drives the hollow stud 221 to rotate. The driving device is provided with a torque detection device. When the torque detected by the torque detection device reaches a set value, the rotation stops, the hollow stud 221 is locked, and the hollow stud 221 reaches the maximum locking torque.
[0030] like Figure 5The airtightness test device shown in the figure has a mounting bracket 1 with a mounting position 11, to which a valve 2 is connected. The mounting position 11 is laterally open and includes a bottom 111, a side 112, and a top 113. A first passage 21 is provided on the valve 2, one end of which abuts the side 112. A first sealing device 3 passes through a through-hole provided in the side 112 and is sealedly connected to the first passage 21. A notch 1131 is provided on the top 113, into which the valve stem 25 engages. The notch 1131 opens on the side of the valve stem 25 away from the side 112. The bottom of the valve 2 abuts the bottom 111.
[0031] The above embodiments are illustrative and intended to illustrate the technical concepts and features of the present invention so that those skilled in the art can understand the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention shall be included within the scope of protection of the present invention.
Claims
1. An airtightness testing device, characterized in that: The invention comprises a fixing frame (1), wherein the fixing frame (1) is connected to a valve (2), wherein the valve (2) is provided with a channel for fluid to pass through, wherein the channel of the valve (2) comprises a first channel (21) and a second channel (22); the fixing frame (1) is connected to a bracket, wherein the bracket is connected to a first sealing device (3) and a second sealing device (4), wherein the first sealing device (3) seals the first channel (21), and the second sealing device (4) seals the second channel (22); and a fluid is supplied to the first channel (21) through the first sealing device (3). 1) high-pressure air is introduced into the second passage (22) through the second sealing device (4) to detect the air tightness of the valve (2); the valve (2) is provided with a second passage (22) having a hollow stud (221) connected at one end, the hollow stud (221) and the valve (2) are threadedly connected, the second passage (22) is arranged along the axis of the hollow stud (221), the second sealing device (4) and the hollow stud (221) are drive-connected, and the second sealing device (4) is rotated to lock the hollow stud (221).
2. The airtightness testing device according to claim 1, characterized in that: The valve (2) comprises a valve body (23), a valve core (24) is connected to the inside of the valve body (23), the valve core (24) is connected to a valve stem (25), and the valve stem (25) extends out of the valve body (23); the valve core (24) is provided with a through hole, and the two ends of the valve core (24) are respectively connected to the first channel (21) and the second channel (22), and the valve stem (25) is rotated to drive the valve core (24) to rotate and connect the first channel (21) and the second channel (22); the hollow stud (221) and the valve body (23) are threadedly connected, the hollow stud (221) and the valve core (24) are tightly connected via a first sealing ring (222), the valve core (24) and the second channel (22) are tightly connected via a second sealing ring (223), and the valve stem (25) is tightly connected to the valve body (23) via a valve stem sealing ring (224).
3. The airtightness testing device according to claim 2, characterized in that: The fixing frame (1) is connected to an opening and closing motor (10), and the motor shaft of the opening and closing motor (10) is drivingly connected to the valve stem (25). The opening and closing motor (10) drives the valve stem (25) to rotate, thereby controlling the opening and closing of the valve (2).
4. The airtightness testing device according to claim 1, characterized in that: The first sealing device (3) comprises a cylinder (31), the cylinder (31) is connected to the bracket, the cylinder shaft of the cylinder (31) is connected to a sealing ring, the cylinder shaft of the cylinder (31) extends into the first channel (21), and the cylinder shaft of the cylinder (31) and the first channel (21) are sealed and connected; the cylinder shaft of the cylinder (31) is provided with a first through hole (32), the first through hole (32) is communicated with the first channel (21), and the first through hole (32) is connected to the air pipe.
5. The airtightness testing device according to claim 2, characterized in that: The second sealing device (4) comprises a column (41), one end of the column (41) abuts against one end of the second passage (22) provided in the valve (2), a plug (42) is provided at the abutting end of the column (41) and the second passage (22), the plug (42) is connected to a sealing ring, the plug (42) extends into the second passage (22), and the plug (42) and the second passage (22) are hermetically connected.
6. The airtightness testing device according to claim 5, characterized in that: The hollow stud (221) is provided with a slot (2211) at one end away from the valve core (24); the plug (42) is provided with a boss (421) at one end abutting against the valve (2); the boss (421) is inserted into the slot (2211), and the hollow stud (221) is rotated to rotate when the column (41) is rotated.
7. The airtightness testing device according to claim 6, characterized in that: The column (41) is provided with a through hole (411), and the through hole (411) is configured as a countersunk through hole. The countersunk portion of the through hole (411) is provided on a side of the column (41) close to the valve (2). An elastic ejector pin (412) is connected in the through hole (411). An end of the column (41) away from the valve (2) is connected to a fixed plate (413), and the elastic ejector pin (412) and the fixed plate (413) are slidably connected. The boss (421) is provided on an end of the elastic ejector pin (412) away from the fixed plate (413). The elastic ejector pin (412) damps movement along the axis of the through hole (411).
8. The airtightness testing device according to claim 7, characterized in that: The elastic ejector pin (412) includes an ejector pin (4121), a spring (4122) arranged around the ejector pin (4121), one end of the ejector pin (4121) away from the fixed plate (413) is connected to a limiting portion (4123), the diameter of the limiting portion (4123) is larger than the diameter of the ejector pin (4121), one end of the spring (4122) abuts against the fixed plate (413), and one end of the spring (4122) away from the fixed plate (413) abuts against the limiting portion (4123); a limiting column (4124) is provided on the side wall of the limiting portion (4123), the column (41) is provided with a sliding groove (414) corresponding to the limiting column (4124), and the column (41) slides in the sliding groove (414).
9. The airtightness testing device according to claim 6, characterized in that: The plug (42) is provided with a second through hole (422), and the second through hole (422) passes through the column (41) and is connected to the air pipe.
10. The airtightness testing device according to claim 2, characterized in that: The fixing frame (1) is provided with a mounting position (11), the valve (2) is connected to the mounting position (11), the mounting position (11) is open laterally, and the mounting position (11) includes a bottom (111), a side (112), and a top (113); the valve (2) is provided with a first channel (21) at one end thereof abutting against the side (112), and the first sealing device (3) is sealedly connected to the first channel (21) through a through hole provided in the side (112); the top (113) is provided with a notch (1131), the valve stem (25) is inserted into the notch (1131), and the opening of the notch (1131) is provided on the side of the valve stem (25) away from the side (112); the lower side of the valve (2) abuts against the bottom (111).