Valve life test device

Abstract

The present invention provides a valve life test device, which includes a main body, which includes: an air intake chamber, an intermediate chamber, an exhaust chamber, a switching mechanism, a valve fixing part and a window; the valve fixing part is used to fix the air valve to be tested, the rear end of the air valve fixing part is provided with an intermediate chamber, and the front end of the air valve fixing part is provided with a switching mechanism, and the switching mechanism includes a driving unit, a first passage and a second passage; at any time, the driving unit is used to move the first passage between the air intake chamber and the air valve fixing part, so that the air intake chamber, the first passage, the air valve to be tested and the intermediate chamber are connected in sequence, or to move the second passage between the exhaust chamber and the air valve fixing part, so that the exhaust chamber, the second passage, the air valve to be tested and the intermediate chamber are connected; the window is aligned with the air valve fixing part, and the window is used to observe the valve plate of the air valve to be tested.

Description

Technical Field

[0001] The invention relates to the technical field of gas valve detection, and in particular to a gas valve life test device. Background Art

[0002] The air valve is one of the core components of a positive displacement compressor. Its working performance and life directly affect the overall performance and life of the compressor.

[0003] At present, there is no test equipment specifically for compressor valve life testing in China. Most tests are carried out on the entire compressor, which is costly and cannot perform accelerated life testing. Summary of the invention

[0004] The purpose of the present invention is to provide a gas valve life test device to alleviate the technical problem of high cost in the prior art of directly testing the valve on the compressor.

[0005] An embodiment of the present invention provides a gas valve life test device, the gas valve life test device comprises a body, the body comprises: an air inlet cavity, an intermediate cavity, an exhaust cavity, a switching mechanism, a gas valve fixing part and a window;

[0006] The air valve fixing part is used to fix the air valve to be tested, the rear end of the air valve fixing part is provided with an intermediate cavity, the front end of the air valve fixing part is provided with a switching mechanism, the switching mechanism includes a driving unit, a first passage and a second passage, at any time, the driving unit is used to move the first passage between the air inlet cavity and the air valve fixing part so that the air inlet cavity, the first passage, the air valve to be tested and the intermediate cavity are connected in sequence, or to move the second passage between the air exhaust cavity and the air valve fixing part so that the air exhaust cavity, the second passage, the air valve to be tested and the intermediate cavity are connected;

[0007] The window is aligned with the gas valve fixing portion, and the window is used to observe the valve plate of the gas valve to be tested.

[0008] Furthermore, the body comprises a shell, an intermediate end cover and a rear end cover which are connected in sequence, the intermediate end cover comprises a mounting hole which passes through the front and rear end surfaces thereof, and the mounting hole forms the air valve fixing portion;

[0009] The switching mechanism comprises a rotatable gas distribution plate, the gas distribution plate is located between the middle end cover and the housing, the gas distribution plate has a through hole penetrating the front and rear surfaces thereof, the through hole forms the first passage; the rear end surface of the gas distribution plate is provided with a groove body extending radially outwards thereof, the groove body forms the second passage;

[0010] The gap between the front surface of the gas distribution plate and the shell forms an air inlet cavity; the middle end cover and the shell form the exhaust cavity; the middle end cover and the rear end cover form the middle cavity; the window is located on the rear end cover.

[0011] Furthermore, the number of the air valve fixing portion, the first passage and the second passage are multiple and correspond one to one.

[0012] Furthermore, the switching mechanism includes an air distribution block, which is used to be installed at an opening on the first passage close to one end of the middle end cover, and the air distribution block is provided with an air guide hole, and the shape of the cross-section of the air guide hole includes a straight edge, and the straight edge first intersects with the air valve to be tested when the air guide hole and the air valve to be tested rotate and overlap.

[0013] Furthermore, the gas distribution plate is clearance-fitted with the shell and the middle end cover respectively.

[0014] Furthermore, the driving unit includes a rotating shaft, which passes through the air intake cavity and is connected to the air distribution disk. A front bearing and a rear bearing are arranged at intervals in the shell, and the rotating shaft is installed in the front bearing and the rear bearing.

[0015] Furthermore, the housing is provided with an input port for lubricating oil mist located between the front bearing and the rear bearing;

[0016] A bracket is arranged in the shell, the rotating shaft passes through the bracket, and a shaft seal is arranged between the bracket and the rotating shaft. The shaft seal is used to prevent lubricating oil from entering the air intake chamber and can seal the compressed air in the air intake chamber.

[0017] Furthermore, the air valve life test device includes a first regulating valve, which is connected to the air inlet of the air inlet cavity and is used to adjust the pressure of the air inlet cavity.

[0018] Furthermore, the gas valve life test device includes a second regulating valve, which is connected to the middle chamber and is used to adjust the pressure of the middle chamber.

[0019] Furthermore, the gas valve life test device comprises a laser Doppler vibrometer, and the laser Doppler vibrometer is used to detect the movement state of the valve plate of the gas valve to be tested through the window.

[0020] The valve life test device provided in an embodiment of the present invention includes a main body, which includes: an air intake chamber, an intermediate chamber, an exhaust chamber, a switching mechanism, an air valve fixing part and a window; the air valve fixing part is used to fix the air valve to be tested, and the rear end of the air valve fixing part is provided with an intermediate chamber, and the front end of the air valve fixing part is provided with a switching mechanism, and the switching mechanism includes a driving unit, a first passage and a second passage. At any time, the driving unit is used to move the first passage between the air intake chamber and the air valve fixing part so that the air intake chamber, the first passage, the air valve to be tested and the intermediate chamber are connected in sequence, or to move the second passage between the exhaust chamber and the air valve fixing part so that the exhaust chamber, the second passage, the air valve to be tested and the intermediate chamber are connected; the window is aligned with the air valve fixing part, and the window is used to observe the valve plate of the air valve to be tested. The operating principle of the device is as follows: the gas valve to be tested can be installed on the gas valve fixing part, and then the switching mechanism is adjusted to make the first passage in the switching mechanism move between the air inlet chamber and the air valve fixing part, the air inlet chamber, the first passage, the gas valve to be tested and the middle chamber are connected in sequence, the gas in the air inlet chamber pushes the gas valve to be tested open after passing through the first passage, and then enters the middle chamber, forming a certain pressure in the middle chamber; when the first passage is moved away from between the air inlet chamber and the air valve fixing part by adjusting the switching mechanism, the air inlet chamber and the middle chamber are disconnected; when the second passage is moved between the exhaust chamber and the air valve fixing part by adjusting the switching mechanism, the exhaust chamber, the second passage, the gas valve to be tested and the middle chamber are connected, the gas in the middle chamber closes the gas valve to be tested, and then the gas is discharged from the exhaust chamber. By repeatedly switching the state of the switching mechanism, the air inlet chamber and the middle chamber, and the middle chamber and the exhaust chamber are connected in time, so as to realize the opening and closing of the gas valve to be tested. In the above process, the movement state of the valve plate of the gas valve to be tested can be collected through the window, and the performance of the gas valve to be tested can be analyzed through the movement state of the valve plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A cross-sectional view of the main body of the gas valve life test device provided by an embodiment of the present invention;

[0023] Figure 2 for Figure 1 A partial enlarged view of the middle M position;

[0024] Figure 3A schematic diagram of a gas distribution plate of a gas valve life test device provided by an embodiment of the present invention;

[0025] Figure 4 A schematic diagram of a valve life test device provided in an embodiment of the present invention when the air inlet cavity and the intermediate cavity of the body are connected;

[0026] Figure 5 A schematic diagram of a valve life test device provided in an embodiment of the present invention when the middle cavity and the exhaust cavity of the body are connected;

[0027] Figure 6 A schematic diagram of a gas valve life test device provided in an embodiment of the present invention.

[0028] Icons: 110 - air inlet chamber; 120 - middle chamber; 130 - exhaust chamber; 200 - shell; 210 - bracket; 220 - shaft seal; 230 - front bearing; 240 - rear bearing; 250 - rotating shaft; 300 - middle end cover; 400 - rear end cover; 410 - window; 500 - air valve to be tested; 610 - air distribution plate; 611 - through hole; 612 - groove body; 700 - air distribution bushing; 800 - air distribution block; 810 - straight edge; 910 - pressure sensor; 920 - drive unit; 930 - laser Doppler vibrometer; 940 - second regulating valve; 950 - first regulating valve; 960 - muffler. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The valve life test device provided in the embodiment of the present invention can perform impact action fatigue tests on compressor valves (including mushroom valves, annular valves, mesh valves, etc.). By adjusting the intake pressure, it can simulate the movement laws of compressor valves under different working conditions and has the ability to accelerate tests. During the test, the movement laws of the valve plates can be conveniently tested through sensors.

[0031] like Figure 1 - Figure 6As shown, the main body includes: an air inlet chamber 110, an intermediate chamber 120, an exhaust chamber 130, a switching mechanism, a valve fixing portion and a window 410. The air inlet chamber 110 is connected to an air inlet, and the outer end of the air inlet can be connected to an air source. A first regulating valve 950 can be arranged between the air source and the air inlet to adjust the pressure of the air inlet chamber 110, thereby adjusting the maximum pressure value applied to the front port of the air valve 500 to be tested, so as to facilitate the adjustment of the test parameters. The first regulating valve 950 can be a pressure reducing valve. An air inlet isolation valve can also be arranged between the air source and the air inlet to connect or disconnect the air source.

[0032] The exhaust chamber 130 is provided with an exhaust port, which can be connected to the atmosphere through a muffler 960 to reduce noise during exhaust.

[0033] The gas valve fixing part is used to fix the gas valve 500 to be tested. The rear end of the gas valve fixing part is provided with an intermediate cavity 120 . The rear port of the gas valve 500 to be tested is communicated with the intermediate cavity 120 .

[0034] A switching mechanism is provided at the front end of the air valve fixing part, and the switching mechanism includes a driving unit 920, a first passage and a second passage. At any time, the driving unit is used to move the first passage between the air inlet chamber 110 and the air valve fixing part so that the air inlet chamber 110, the first passage, the air valve to be tested 500 and the intermediate chamber 120 are connected in sequence, or the second passage is moved between the exhaust chamber 130 and the air valve fixing part so that the exhaust chamber 130, the second passage, the air valve to be tested 500 and the intermediate chamber 120 are connected; the window 410 is aligned with the air valve fixing part, and the window 410 is used to observe the valve plate of the air valve to be tested 500.

[0035] The operating principle of the device is as follows: before testing, the gas valve 500 to be tested is installed on the gas valve fixing part, and then the switching mechanism is adjusted to make the first passage in the switching mechanism move between the air inlet chamber 110 and the air valve fixing part, the air inlet chamber 110, the first passage, the gas valve 500 to be tested and the intermediate chamber 120 are connected in sequence, the gas in the air inlet chamber 110 pushes the gas valve 500 to be tested after passing through the first passage, and then enters the intermediate chamber 120, forming a certain pressure in the intermediate chamber 120; when the first passage is moved away from between the air inlet chamber 110 and the air valve fixing part by adjusting the switching mechanism, the air inlet chamber 110 and the intermediate chamber 120 are disconnected; when the second passage is moved between the exhaust chamber 130 and the air valve fixing part by adjusting the switching mechanism, the exhaust chamber 130, the second passage, the gas valve 500 to be tested and the intermediate chamber 120 are connected, the gas in the intermediate chamber 120 closes the gas valve 500 to be tested, and then the gas is discharged from the exhaust chamber 130. By repeatedly switching the state of the switching mechanism, the air inlet chamber 110 and the middle chamber 120, and the middle chamber 120 and the exhaust chamber 130 are connected in time, so as to realize the opening and closing of the gas valve 500 to be tested. In the above process, the movement state of the valve plate of the gas valve 500 to be tested can be collected by using the window 410, and the performance of the gas valve 500 to be tested can be analyzed through the movement state of the valve plate.

[0036] The valve life test device includes a shell 200, an intermediate end cover 300 and a rear end cover 400 connected in sequence, the intermediate end cover 300 includes a mounting hole passing through its front and rear end surfaces, and the mounting hole forms the valve fixing portion; the switching mechanism includes a rotatable gas distribution plate 610, the gas distribution plate 610 is located between the intermediate end cover 300 and the shell 200, and the gas distribution plate 610 has a through hole 611 passing through its front and rear surfaces, and the through hole 611 forms the first passage; a groove body 612 extending radially outward is provided on the rear end surface of the gas distribution plate 610, and the groove body 612 forms the second passage; the gap between the front surface of the gas distribution plate 610 and the shell 200 forms an air intake cavity 110; the intermediate end cover 300 and the shell 200 form the exhaust cavity 130; the intermediate end cover 300 and the rear end cover 400 form the intermediate cavity 120; the window 410 is located on the rear end cover 400.

[0037] Specifically, the present embodiment provides a specific structure of a gas valve life test device, wherein the housing 200, the middle end cover 300 and the rear end cover 400 are sealed and connected in sequence. The gas valve 500 to be tested is installed in the installation hole of the middle end cover 300, and the front end opening of the gas valve 500 to be tested faces the gas distribution disk 610, and the rear end opening faces the middle cavity 120. The gas distribution disk 610 is coaxial with the middle end cover 300. The gas distribution disk 610 can be driven by the driving unit 920 to rotate so that the through hole 611 on the gas distribution disk 610 is aligned with the front end opening of the gas valve 500 to be tested. When the through hole 611 on the gas distribution disk 610 is aligned with the front end opening of the gas valve 500 to be tested, the air inlet cavity 110, the through hole 611, the gas valve 500 to be tested and the intermediate cavity 120 are connected in sequence, and the gas valve 500 to be tested is opened; and when the slot body 612 on the gas distribution disk 610 rotates to align with the front end opening of the gas valve 500 to be tested, the outer end opening of the slot body 612 is connected with the exhaust cavity 130, the intermediate cavity 120, the gas valve 500 to be tested, the slot body 612 and the exhaust cavity 130 are connected in sequence, and the gas valve 500 to be tested is closed. During the rotation of the gas distribution disk 610, the gas valve 500 to be tested is repeatedly switched between the open and closed states. The window 410 is located on the rear end cover 400, and the window 410 faces the middle end cover 300. The laser Doppler vibrometer 930 located outside the window 410 can collect the motion state of the valve plate through the window 410. By observing the window 410, the motion law of the valve plate can be measured non-contactly, and the relationship between the motion law of the gas valve plate and the pressure difference of each chamber can be accurately calibrated.

[0038] The gap between the front surface of the gas distribution disc 610 and the housing 200 forms the air intake cavity 110; the intermediate end cover 300 and the housing 200 form the exhaust cavity 130; the intermediate end cover 300 and the rear end cover 400 form the intermediate cavity 120. A gas distribution bushing 700 is installed on the side of the housing 200 facing the intermediate end cover 300. The gas distribution bushing 700 is an auxiliary part used to adjust the gap between the parts. The gas distribution disc 610 is sleeved in the gas distribution bushing 700, and in the radial direction, there is a gap A between the gas distribution disc 610 and the gas distribution bushing 700; in the axial direction, there is a gap B between the gas distribution disc 610 and the end face of the gas distribution bushing 700, and there is an end face gap C between the gas distribution disc 610 and the intermediate end cover 300. The gap B and the gap C can be adjusted by the gasket between the gas distribution disc 610 and the rotating shaft 250. Because of the gaps A, B and C, the air distribution disc 610 encounters less resistance, so that the air distribution disc 610 rotates more smoothly.

[0039] The valve bushing 700 is made of self-lubricating materials such as polytetrafluoroethylene (PTFE) or brass+graphite.

[0040] The rear end cover 400 is provided with an acrylic plate with high light transmittance to form a window 410 for the laser Doppler vibrometer 930 to capture the motion law of the valve plate of the gas valve 500 to be tested.

[0041] The number of the air valve fixing part, the first passage and the second passage are multiple and correspond one to one.

[0042] In this embodiment, the number of the gas valve fixing part, the first passage and the second passage are two, and the gas distribution plate 610 can simultaneously test two gas valves 500 to be tested. The gas distribution plate 610 is provided with two through holes 611 and two grooves 612. The through holes 611 are circular channels, and the grooves 612 are rectangular grooves.

[0043] According to the requirements, the number of the gas valve fixing parts, the first passages and the second passages can also be three, four or more.

[0044] The switching mechanism includes an air distribution block 800, which is used to be installed at an opening on the first passage close to one end of the middle end cover 300, and an air guide hole is provided on the air distribution block 800. The shape of the cross-section of the air guide hole includes a straight edge 810. When the air guide hole and the air valve 500 to be tested rotate and overlap, the straight edge 810 first intersects with the air valve 500 to be tested.

[0045] The air distribution block 800 can be installed on the rear end face of the air distribution disk 610 by screws. The air distribution block 800 is made of a lightweight and wear-resistant material, such as polyetheretherketone (PEEK). The air guide holes on the air distribution disk 610 are aligned with the through holes 611 on the air distribution disk 610, and the cross-section of the air guide holes includes a straight edge 810. When the air distribution disk 610 rotates, the air guide holes will gradually overlap with the air valve 500 to be tested. Because the edge of the air guide hole that first intersects with the air valve 500 to be tested is set to a straight edge 810, the first passage can quickly overlap with the air valve 500 to be tested, which helps to quickly open the air valve. In this embodiment, the cross-section of the air guide hole is in the shape of a "D" type. In other embodiments, the cross-section of the air guide hole is in the shape of a rectangle, etc.

[0046] The driving unit 920 includes a rotating shaft 250, which passes through the air inlet cavity 110 and is connected to the gas distribution plate 610. A front bearing 230 and a rear bearing 240 are arranged in the housing 200 at intervals, and the rotating shaft 250 is installed in the front bearing 230 and the rear bearing 240. The front bearing 230 and the rear bearing 240 use angular contact ball bearings, which can be self-lubricating bearings or ordinary angular contact ball bearings and use oil mist lubrication.

[0047] The housing 200 is provided with an input port for lubricating oil mist located between the front bearing 230 and the rear bearing 240; the housing 200 is provided with a bracket 210, and the bracket 210 is used to install a shaft seal 220. The rotating shaft 250 passes through the bracket 210, and a shaft seal 220 is provided between the bracket 210 and the rotating shaft 250. The shaft seal 220 is used to prevent lubricating oil from entering the air inlet cavity 110 and can seal the compressed air in the air inlet cavity 110. The shaft seal 220 has the ability to withstand a relative linear velocity of 5.6 m / s for a long time, seal an air pressure not less than 1 MPa, and does not require lubrication.

[0048] The valve life test device includes a second regulating valve 940, which is connected to the intermediate chamber 120 and the atmosphere, and is used to adjust the pressure of the intermediate chamber 120, thereby changing the difference between the intake pressure and the pressure of the intermediate chamber 120.

[0049] The gas valve life test device includes a laser Doppler vibrometer 930, which is used to detect the motion state of the valve plate of the gas valve 500 to be tested through the window 410. The initial test is carried out by adjusting the different pressures of each chamber and the rotation speed of the rotating shaft 250, and calibrating the motion law of the valve plate using the laser Doppler vibrometer 930 under different conditions. After the calibration is completed, the pressure of different chambers can be adjusted as needed to achieve different valve plate impact speeds.

[0050] The drive unit 920 can be a brushless DC motor. By adjusting the motor speed, the valve life acceleration test can be conveniently performed. The maximum test frequency can reach 100 Hz, which is far higher than the valve switching frequency of a general positive displacement compressor.

[0051] Pressure sensors 910 are provided at the air inlet of the air inlet cavity 110 and the air outlet of the middle cavity 120 for detecting the pressure in the air inlet cavity 110 and the pressure in the middle cavity 120 .

[0052] The gas valve life test device also includes a controller connected to the two sensors respectively, which can collect pressure signals.

[0053] The gas distribution plate 610 is made of 2A-12 aviation aluminum alloy, which reduces weight while having certain mechanical properties, reduces the rotational inertia of the entire shaft system, and thus reduces the load of the motor.

[0054] The device can adopt an air source of 0.8Mpa-1Mpa and be driven by low-pressure compressed air to realize accelerated life test of high-pressure compressor air valves. The test has low power consumption, low cost and short cycle.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A valve life test device, characterized in that: The gas valve life test device comprises a body, wherein the body comprises: an air intake chamber (110), an intermediate chamber (120), an exhaust chamber (130), a switching mechanism, a gas valve fixing portion and a window (410); The gas valve fixing part is used to fix the gas valve (500) to be tested, the rear end of the gas valve fixing part is provided with an intermediate cavity (120), and the front end of the gas valve fixing part is provided with a switching mechanism, and the switching mechanism includes a driving unit (920), a first passage, and a second passage; at any time, the driving unit is used to move the first passage between the air intake cavity (110) and the gas valve fixing part so that the air intake cavity (110), the first passage, the gas valve (500) to be tested, and the intermediate cavity (120) are connected in sequence, or to move the second passage between the exhaust cavity (130) and the gas valve fixing part so that the exhaust cavity (130), the second passage, the gas valve (500) to be tested, and the intermediate cavity (120) are connected; The window (410) is aligned with the gas valve fixing portion, and the window (410) is used to observe the valve plate of the gas valve (500) to be tested.

2. The valve life test device according to claim 1, characterized in that: The body comprises a shell (200), an intermediate end cover (300) and a rear end cover (400) which are connected in sequence, the intermediate end cover (300) comprising a mounting hole penetrating the front and rear end surfaces thereof, the mounting hole forming the air valve fixing portion; The switching mechanism comprises a rotatable gas distribution disk (610), the gas distribution disk (610) being located between the middle end cover (300) and the housing (200), the gas distribution disk (610) having a through hole (611) penetrating the front and rear surfaces thereof, the through hole (611) forming the first passage; a groove body (612) extending radially outward is provided on the rear end surface of the gas distribution disk (610), the groove body (612) forming the second passage; The gap between the front surface of the gas distribution plate (610) and the shell (200) forms an air intake cavity (110); the intermediate end cover (300) and the shell (200) form the exhaust cavity (130); the intermediate end cover (300) and the rear end cover (400) form the intermediate cavity (120); and the window (410) is located on the rear end cover (400).

3. The valve life test device according to claim 2, characterized in that: The number of the air valve fixing part, the first passage and the second passage are multiple and correspond one to one.

4. The valve life test device according to claim 2, characterized in that: The switching mechanism comprises an air distribution block (800), the air distribution block (800) being used to be installed at an opening of the first passage close to one end of the intermediate end cover (300), and the air distribution block (800) is provided with an air guide hole, the cross-sectional shape of the air guide hole comprises a straight side (810), and the straight side (810) first intersects with the air valve (500) to be tested when the air guide hole and the air valve (500) to be tested are rotated and overlapped.

5. The valve life test device according to claim 2, characterized in that: The gas distribution plate (610) is clearance-matched with the housing (200) and the middle end cover (300) respectively.

6. The valve life test device according to claim 2, characterized in that: The driving unit (920) comprises a rotating shaft (250), the rotating shaft (250) passes through the air intake chamber (110) and is connected to the air distribution plate (610), a front bearing (230) and a rear bearing (240) are arranged at intervals in the housing (200), and the rotating shaft (250) is installed in the front bearing (230) and the rear bearing (240).

7. The valve life test device according to claim 6, characterized in that: The housing (200) is provided with an input port for lubricating oil mist located between the front bearing (230) and the rear bearing (240); A bracket (210) is arranged in the housing (200), the rotating shaft (250) passes through the bracket (210), and a shaft seal (220) is arranged between the bracket (210) and the rotating shaft (250). The shaft seal (220) is used to prevent lubricating oil from entering the air intake chamber (110) and can seal the compressed air in the air intake chamber (110).

8. The valve life test device according to claim 2, characterized in that: The gas valve life test device comprises a first regulating valve (950), wherein the first regulating valve (950) is connected to the air inlet of the air inlet chamber (110) and is used to regulate the pressure of the air inlet chamber (110).

9. The gas valve life test device according to claim 2, characterized in that: The gas valve life test device comprises a second regulating valve (940), wherein the second regulating valve (940) is connected to the middle chamber (120) and is used to regulate the pressure of the middle chamber (120).

10. The gas valve life test device according to claim 1, characterized in that: The gas valve life test device comprises a laser Doppler vibrometer (930), and the laser Doppler vibrometer (930) is used to detect the motion state of the valve plate of the gas valve (500) to be tested through the window (410).

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