One-way air tightness testing device for one-way valve

Abstract

The invention discloses a one-way air tightness testing device for a one-way valve, relates to the field of one-way valve air tightness testing, and solves the problem that the detection results of the existing one-way valve air tightness testing device are not comprehensive and accurate enough when used. The device comprises a body, a detection mechanism, a control mechanism and a testing mechanism. A fixed cylinder, a fixed box, a first output pipe and a second output pipe are fixedly connected to the body. The detection mechanism comprises a driving plate. A rotating box is rotatably connected in the fixed box. The one-way air tightness testing device for a one-way valve is convenient for fixing the one-way valve in the rotating box through the detection mechanism, and the air pressure on both sides of the one-way valve is changed by changing the position of the driving plate. The air pressure change in the first output pipe and the second output pipe is observed to judge the air tightness of the one-way valve. The air pressure change in the rotating box is sensed by the control mechanism to avoid leakage at the connection to affect the detection result. At the same time, the device can assist in adjusting the direction of the one-way valve, perform multiple adjustment measurements, and reduce the detection error through the testing mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of one-way valve air tightness testing, in particular to a one-way valve one-way air tightness testing device. Background Art

[0002] A one-way valve is a valve that allows fluid to flow only along the inlet, but the medium at the outlet cannot flow back. It is commonly known as a one-way valve. A one-way valve is also called a check valve or a non-return valve. It is used in hydraulic systems to prevent oil from flowing in the opposite direction, or in pneumatic systems to prevent compressed air from flowing in the opposite direction. There are two types of one-way valves: straight-through and right-angle. Straight-through one-way valves are installed on the pipeline with threaded connections. Right-angle one-way valves are available in three types: threaded connection, plate connection, and flange connection. Before pneumatic one-way valves are processed and shipped out of the factory, they need to be strictly tested for air tightness to avoid the use of the sold one-way valves due to insufficient air tightness.

[0003] Existing one-way valve air tightness test devices mostly use one-way inflation to detect the air tightness and flowability. The detection method is relatively simple. It is difficult to determine the leakage at the one-way valve connection and other locations during the detection process, which leads to errors in the detection. In addition, since the one-way valve has a certain resistance when limiting the flow of gas, the one-way gas will not flow completely to the other side of the one-way valve during inflation. It is difficult for existing equipment to detect the size of this resistance. To this end, we propose a one-way air tightness test device for a one-way valve. Summary of the invention

[0004] The object of the present invention is to provide a one-way air tightness testing device for a one-way valve which is convenient for reducing the influence of variables and improving the detection accuracy, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a one-way air tightness testing device for a one-way valve, comprising a body, a detection mechanism, a control mechanism and a testing mechanism, wherein a fixed cylinder is fixedly connected to the body, and two ends of the fixed cylinder are respectively connected to a first output tube and a second output tube, and a fixed box is fixedly connected between the first output tube and the second output tube, and the detection mechanism comprises a driving plate connected to the inner wall of the fixed cylinder in a horizontal direction for sliding, and a rotating box is rotatably connected in the fixed box, and a connecting piece for fixing the one-way valve is provided in the rotating box, and the detection mechanism is used to change the air pressure on both sides of the one-way valve by fixing the one-way valve in the rotating box and changing the position of the driving plate, and observe the air pressure changes in the first output tube and the second output tube. The air tightness of the one-way valve is judged by the control mechanism, the control mechanism includes a box door hinged with the rotating box, the side of the rotating box is fixedly connected with a first air pressure valve, and the rotating box is provided with a docking piece for ensuring that both ends of the one-way valve are tightly connected with the first output pipe and the second output pipe. The control mechanism is used to sense the air pressure change in the rotating box through the first air pressure valve to avoid leakage at the connection point affecting the detection result, and at the same time can assist in adjusting the direction of the one-way valve, perform multiple adjustment measurements, and reduce errors. The test mechanism is installed in the rotating box, and is used to replace the one-way valve, and control the connection state between the first output pipe and the second output pipe, perform repeated tests, and compare with the test results of the one-way valve, so as to reduce the detection error, reduce the influence of variables, and improve the detection accuracy.

[0006] Preferably, the connecting member includes two groups of fixed tubes fixedly installed in the rotating box, and the outer walls of the fixed tubes are movably sleeved with threaded sleeves. The two groups of threaded sleeves can be threadedly connected to the two ends of the one-way valve respectively, and the first output tube and the second output tube can be connected to the fixed tubes, so as to facilitate the fixation of the one-way valve.

[0007] Preferably, the detection mechanism also includes an electric telescopic rod fixedly installed in the body, the output end of the electric telescopic rod is fixedly connected to a connecting rod, the driving plate is fixedly connected to a driving rod, the driving rod passes through both ends of the fixed cylinder and is slidably connected to the fixed cylinder in a horizontal direction, both ends of the driving rod are fixedly connected to the connecting rod, the first output pipe is fixedly connected to a second air pressure valve, and the second output pipe is fixedly connected to a third air pressure valve, which is convenient for observing the air pressure changes in the first output pipe and the second output pipe to judge the air tightness of the one-way valve.

[0008] Preferably, the docking member includes a fixing ring fixedly installed in the fixing tube, a tension spring is fixedly connected to the side of the fixing ring, a sealing ring is slidably connected in the fixing tube, one end of the tension spring is fixedly connected to the sealing ring, one end of the first output tube and the second output tube can both contact one side of the sealing ring, and a control member for controlling the movement state of the sealing ring is provided in the rotating box, so as to ensure that both ends of the one-way valve are closely connected with the first output tube and the second output tube.

[0009] Preferably, the control member includes two groups of push rods installed on the rotating box, one end of the push rod is provided with a first inclined surface, the side of the sealing ring is provided with a second inclined surface slidingly fitted with the first inclined surface, the sealing ring passes through the rotating box and is slidably connected to the rotating box, the fixed tube is provided with a sliding groove slidably connected to the push rod, and the rotating box is provided with a driving member for driving the push rod to move, so as to facilitate the control of the movement state of the sealing ring.

[0010] Preferably, the testing mechanism includes two groups of springs fixedly installed in the rotating box, one end of the spring is fixedly connected to an arc tube, a baffle is inserted in the arc tube, the two groups of arc tubes can be combined into a group of circular pipes, and both ends of the two groups of arc tubes are provided with threaded grooves that can be threadedly connected to the threaded sleeve, so as to facilitate the replacement of the one-way valve and control the connection state between the first output pipe and the second output pipe for repeated testing.

[0011] Preferably, the driving member includes a threaded rod rotatably connected to the outer wall of the rotating box, and a mounting rod is provided on the rotating box. The threaded rod passes through the mounting rod and is threadedly connected to the mounting rod. One end of the two groups of push rods are fixedly connected to the mounting rod to facilitate driving the push rods to move.

[0012] Preferably, a first rubber ring is fixedly connected in the sliding groove, and second rubber rings are fixedly connected at both ends of the fixed tube. The outer wall of the second rubber ring on one side slides in contact with the inner wall of the fixed box to ensure the sealing of the docking sliding position.

[0013] Preferably, a side surface of the fixing ring is fixedly connected to a limiting rod, and the limiting rod is slidably connected to the inner wall of the sealing ring along a horizontal direction, so as to guide the moving state of the sealing ring.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. A one-way air tightness testing device for a one-way valve provided by the present invention solves the problem that the test results of the existing one-way valve air tightness testing device are not comprehensive and accurate when used. The electric telescopic rod is controlled to drive the connecting rod and the driving rod to move, so that the driving plate is in the middle position of the fixed cylinder. At this time, the air pressure on both sides of the driving plate in the fixed cylinder is balanced, the box door is opened, and the one-way valve to be tested is placed in the rotating box, the threaded sleeve is slid so that the threaded sleeve contacts the two ends of the one-way valve and then the threaded sleeve is rotated to complete the threaded connection and fixation, and the threaded rod is rotated so that the installation rod drives the pushing rods on both sides to insert into the sliding groove, and the second inclined surface is pushed by the first inclined surface, so that the sealing ring contacts and seals the first output pipe and the second output pipe on both sides, and the box door is closed to achieve the sealing of the rotating box. At this time, the installation operation of the one-way valve can be completed.

[0016] 2. The present invention provides a one-way air tightness testing device for a one-way valve, which changes the rotation direction of the one-way valve by successively adjusting the sliding direction and sliding position of a driving plate, and finally completely blocks the first output pipe and the second output pipe, performs multiple measurements, records data of the first air pressure valve, the second air pressure valve and the third air pressure valve, compares the resistance of the one-way valve in reverse airflow and the air pressure difference when completely blocked, compares the air pressure value of the one-way valve in the forward airflow and the air pressure difference when fully open, and comprehensively obtains the pass rate, resistance index and sealing strength of the one-way valve. The detection result is more comprehensive and efficient, reduces unstable factors in the operation process, and improves accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0019] Figure 3 It is a partial structural cross-sectional view of the detection mechanism of the present invention;

[0020] Figure 4 It is a schematic diagram of the local structure of the connecting piece of the present invention;

[0021] Figure 5 for Figure 4 A magnified image of the middle A area;

[0022] Figure 6 It is a schematic diagram of the local structure of the control mechanism of the present invention;

[0023] Figure 7 It is a schematic diagram of the structure of the testing mechanism of the present invention;

[0024] Figure 8 It is a cross-sectional view of the local structure of the docking piece of the present invention;

[0025] Fig. 9It is a schematic diagram of the local structure of the driving member of the present invention;

[0026] Fig.10 for Fig. 9 Enlarged view of area B;

[0027] Fig.11 It is a partial structural cross-sectional view of the control mechanism of the present invention;

[0028] Fig.12 It is a schematic diagram of the control component structure of the present invention.

[0029] In the figure: 1-body; 2-fixed cylinder; 3-first output pipe; 4-second output pipe; 5-fixed box; 6-detection mechanism; 7-driving plate; 8-rotating box; 9-connecting piece; 10-control mechanism; 11-box door; 12-first air pressure valve; 13-jointing piece; 14-testing mechanism; 15-fixed tube; 16-threaded sleeve; 17-electric telescopic rod; 18-connecting rod; 19-driving rod; 20-second air pressure valve; 21-third air pressure valve; 22-fixing ring; 23-tension spring; 24-sealing ring; 25-control member; 26-pushing rod; 27-first inclined plane; 28-second inclined plane; 29-sliding groove; 30-driving member; 31-spring; 32-arc tube; 33-baffle; 34-threaded groove; 35-threaded rod; 36-installing rod; 37-first rubber ring; 38-second rubber ring; 39-limiting rod; 40-one-way valve. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not 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.

[0031] See also Figure 1-Figure 8The present invention provides a technical solution: a one-way air tightness test device for a one-way valve, comprising a body 1, a detection mechanism 6, a control mechanism 10 and a test mechanism 14, a fixed cylinder 2 is fixedly connected to the body 1, two ends of the fixed cylinder 2 are respectively connected to the first output pipe 3 and the second output pipe 4, a fixed box 5 is fixedly connected between the first output pipe 3 and the second output pipe 4, the detection mechanism 6 comprises a driving plate 7 connected to the inner wall of the fixed cylinder 2 in a horizontal direction, a rotating box 8 is rotatably connected in the fixed box 5, a connecting piece 9 for fixing the one-way valve 40 is provided in the rotating box 8, the detection mechanism 6 is used to change the position of the driving plate 7 by fixing the one-way valve 40 in the rotating box 8, and observe the air pressure in the first output pipe 3 and the second output pipe 4. The air pressure change is used to judge the air tightness of the one-way valve 40. The control mechanism 10 includes a box door 11 hinged to the rotating box 8. A first air pressure valve 12 is fixedly connected to the side of the rotating box 8. A docking piece 13 is provided in the rotating box 8 to ensure that both ends of the one-way valve 40 are tightly connected with the first output pipe 3 and the second output pipe 4. The control mechanism 10 is used to sense the air pressure change in the rotating box 8 through the first air pressure valve 12 to avoid leakage at the connection that affects the detection result. At the same time, it can assist in adjusting the direction of the one-way valve 40, perform multiple adjustment measurements, and reduce errors. The testing mechanism 14 is installed in the rotating box 8, and is used to replace the one-way valve 40, and control the connection state between the first output pipe 3 and the second output pipe 4, perform repeated tests, and compare with the test results of the one-way valve 40 to reduce detection errors.

[0032] See also Figure 1-Figure 8 The connecting member 9 includes two sets of fixed pipes 15 fixedly installed in the rotating box 8. The outer wall of the fixed pipe 15 is movably sleeved with a threaded sleeve 16. The two sets of threaded sleeves 16 can be threadedly connected to the two ends of the one-way valve 40 respectively, and the first output pipe 3 and the second output pipe 4 can be connected to the fixed pipe 15.

[0033] See also Figure 1-Figure 5 The detection mechanism 6 also includes an electric telescopic rod 17 fixedly installed in the body 1, and the output end of the electric telescopic rod 17 is fixedly connected to a connecting rod 18. A driving rod 19 is fixedly connected to the driving plate 7. The driving rod 19 passes through both ends of the fixed cylinder 2 and is slidably connected to the fixed cylinder 2 in the horizontal direction. Both ends of the driving rod 19 are fixedly connected to the connecting rod 18. A second air pressure valve 20 is fixedly connected to the first output pipe 3, and a third air pressure valve 21 is fixedly connected to the second output pipe 4.

[0034] See also Figure 4-Figure 12The docking member 13 includes a fixed ring 22 fixedly installed in the fixed tube 15, a tension spring 23 is fixedly connected to the side of the fixed ring 22, a sealing ring 24 is slidably connected in the fixed tube 15, one end of the tension spring 23 is fixedly connected to the sealing ring 24, one end of the first output tube 3 and the second output tube 4 can both contact one side of the sealing ring 24, and a control member 25 for controlling the moving state of the sealing ring 24 is provided in the rotating box 8.

[0035] See also Figure 6-Figure 12 The control member 25 includes two groups of push rods 26 installed on the rotating box 8, one end of the push rod 26 is provided with a first inclined surface 27, the side of the sealing ring 24 is provided with a second inclined surface 28 slidingly fitted with the first inclined surface 27, the sealing ring 24 passes through the rotating box 8 and is slidably connected to the rotating box 8, the fixed tube 15 is provided with a sliding groove 29 slidably connected to the push rod 26, the rotating box 8 is provided with a driving member 30 for driving the push rod 26 to move, the driving member 30 includes a threaded rod 35 rotatably connected to the outer wall of the rotating box 8, the rotating box 8 is provided with a mounting rod 36, the threaded rod 35 passes through the mounting rod 36 and is threadedly connected to the mounting rod 36, one end of the two groups of push rods 26 are fixedly connected to the mounting rod 36.

[0036] See also Figure 2-Figure 7 The testing mechanism 14 includes two groups of springs 31 fixedly installed in the rotating box 8, one end of the spring 31 is fixedly connected to an arc tube 32, a baffle 33 is inserted in the arc tube 32, the two groups of arc tubes 32 can be combined into a group of circular pipes, and both ends of the two groups of arc tubes 32 are provided with threaded grooves 34 that can be threadedly connected to the threaded sleeve 16.

[0037] See also Figure 9-12 A first rubber ring 37 is fixedly connected in the sliding groove 29, and second rubber rings 38 are fixedly connected at both ends of the fixed tube 15. The outer wall of the second rubber ring 38 on one side slides in contact with the inner wall of the fixed box 5. A limit rod 39 is fixedly connected to the side of the fixed ring 22, and the limit rod 39 is slidably connected to the inner wall of the sealing ring 24 along the horizontal direction.

[0038] In this embodiment, the electric telescopic rod 17 is controlled to drive the connecting rod 18 and the driving rod 19 to move, so that the driving plate 7 is in the middle position of the fixed cylinder 2. At this time, the air pressure on both sides of the driving plate 7 in the fixed cylinder 2 is balanced, the box door 11 is opened, the one-way valve 40 to be tested is placed in the rotating box 8, the threaded sleeve 16 is slid, so that the threaded sleeve 16 contacts the two ends of the one-way valve 40, and then the threaded sleeve 16 is rotated to complete the threaded connection and fixation. The inner wall of the threaded sleeve 16 is also provided with a sealing ring to improve the sealing of the connection with the one-way valve 40. The threaded rod 35 is rotated so that the installation rod 36 drives the push rods 26 on both sides to insert into the sliding groove 29, and the second inclined surface 28 is pushed by the first inclined surface 27, so that the sealing ring 24 contacts and seals the first output pipe 3 and the second output pipe 4 on both sides, and the box door 11 is closed to achieve the sealing of the rotating box 8. At this time, the installation operation of the one-way valve 40 can be completed. During installation, the output end of the one-way valve 40 is preferably facing the first output pipe 3.

[0039] During the detection, the electric telescopic rod 17 is first used to push the driving plate 7 to slide toward the first output pipe 3. At this time, the air pressure in the first output pipe 3 increases and the air pressure in the second output pipe 4 decreases. However, at this time, since the one-way valve 40 is in a one-way gas supply state toward the first output pipe 3, the gas in the first output pipe 3 is difficult to be input into the second output pipe 4 through the one-way valve 40. The values ​​of the second air pressure valve 20 and the third air pressure valve 21 are observed and recorded as S1, and then the driving plate 7 is driven to slide toward the second output pipe 4. At this time, the air pressure in the second output pipe 4 increases and is input into the first output pipe 3 through the one-way valve 40. At this time, the values ​​of the second air pressure valve 20 and the third air pressure valve 21 are recorded as S2. During the whole process, observe whether the value of the first air pressure valve 12 rises. If it rises, it means that there is a leak at the connection of the one-way valve 40, and the detection result is invalid. Then, the driving plate 7 is slid to the center position, and the values ​​of the second air pressure valve 20 and the third air pressure valve 21 are recorded as S3.

[0040] Among them, rotating the threaded rod 35 makes the push rod 26 slide out, and the tension spring 23 pulls the sealing ring 24 to release the conflicting sealing state. At this time, the first output pipe 3 and the second output pipe 4 can be connected through the rotating box 8 and the sliding groove 29 to achieve air pressure balance again, and the rotating box 8 is rotated to make the position of the one-way valve 40 rotate 180°, and the threaded rod 35 is screwed on again to make the sealing ring 24 conflict and seal. At this time, the driving plate 7 is first moved to the second output pipe 4, and the values ​​of the second air pressure valve 20 and the third air pressure valve 21 are recorded as S10, and the driving plate 7 is moved to the side of the first output pipe 3, and the values ​​of the second air pressure valve 20 and the third air pressure valve 21 are recorded as S20, and the driving plate 7 is centered, and the values ​​of the second air pressure valve 20 and the third air pressure valve 21 are recorded as S30.

[0041] Open the box door 11, rotate the threaded sleeve 16 to remove the one-way valve 40, pull the arc tubes 32 on both sides to combine into a round tube, the baffle 33 in the middle contacts each other and closes, then thread the threaded sleeve 16 and the threaded grooves 34 at both ends are threadedly connected, move the drive plate 7 to the first output pipe 3, record the values ​​of the second air pressure valve 20 and the third air pressure valve 21 as S100, remove the arc tube 32, center the drive plate 7, record the values ​​of the second air pressure valve 20 and the third air pressure valve 21 as S000, observe and compare the values ​​of S1, S10 and S100, S2 and S20, S3 and S30, and compare the initial data S000 at the same time, it can be obtained that when the two ends of the one-way valve 40 are inflated to the same degree, the gas circulation situation, when the one-way valve 40 is delivering gas to the gas delivery end , that is, the values ​​of S2 and S20 should be close to S000, and the pressure resistance of the one-way valve 40 in the downstream state can be seen by comparing the value difference between the second air pressure valve 20 and the third air pressure valve 21 on the input and output ends. The greater the difference, the greater the resistance. This resistance value can be specified as needed. When the one-way valve 40 is supplying gas in the reverse direction, it should be in a fully closed state. The values ​​S1 and S10 should be close to the experimental result S100 of the closed state. If there is a difference, it indicates the possibility of leakage. In order to ensure the rigor of the experiment, a reverse test is performed for comparison. The values ​​of S1 and S10, S2 and S20, S3 and S30 obtained from the experimental data should be the same (the values ​​of the second air pressure valve 20 and the third air pressure valve 21 are exactly opposite).

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A one-way air tightness test device for a one-way valve, characterized in that: include: A machine body (1), wherein a fixed cylinder (2) is fixedly connected to the machine body (1), two ends of the fixed cylinder (2) are respectively connected to a first output pipe (3) and a second output pipe (4), and a fixed box (5) is fixedly connected between the first output pipe (3) and the second output pipe (4); Also includes: A detection mechanism (6), the detection mechanism (6) comprising a driving plate (7) slidably connected to the inner wall of the fixed cylinder (2) in a horizontal direction, a rotating box (8) rotatably connected inside the fixed box (5), a connecting piece (9) for fixing the one-way valve inside the rotating box (8), the detection mechanism (6) being used to change the position of the driving plate (7) by fixing the one-way valve in communication with the rotating box (8), thereby changing the air pressure on both sides of the one-way valve, and observing the air pressure changes in the first output pipe (3) and the second output pipe (4) to judge the air tightness of the one-way valve; a control mechanism (10), the control mechanism (10) comprising a box door (11) hinged to the rotating box (8), a first air pressure valve (12) being fixedly connected to a side of the rotating box (8), a docking piece (13) being provided in the rotating box (8) for ensuring that both ends of the one-way valve are tightly connected to the first output pipe (3) and the second output pipe (4), the control mechanism (10) being used to sense air pressure changes in the rotating box (8) through the first air pressure valve (12); A testing mechanism (14), the testing mechanism (14) being installed in the rotating box (8) and used for replacing the one-way valve and controlling the communication state between the first output pipe (3) and the second output pipe (4), the connecting member (9) comprising two groups of fixed pipes (15) fixedly installed in the rotating box (8), the outer walls of the fixed pipes (15) being movably sleeved with threaded sleeves (16), the two groups of threaded sleeves (16) being respectively capable of being threadedly connected to the two ends of the one-way valve, the first output pipe (3) and the second output pipe (4) being both The detection mechanism (6) is capable of being communicated with the fixed tube (15), the detection mechanism (6) further comprising an electric telescopic rod (17) fixedly mounted in the machine body (1), the output end of the electric telescopic rod (17) being fixedly connected to a connecting rod (18), the driving plate (7) being fixedly connected to a driving rod (19), the driving rod (19) passing through both ends of the fixed tube (2) and being slidably connected to the fixed tube (2) in a horizontal direction, the two ends of the driving rod (19) being fixedly connected to the connecting rod (18), and the first output tube (3) being fixedly connected to the driving plate (7). The second output pipe (4) is fixedly connected to a second air pressure valve (20); the second output pipe (4) is fixedly connected to a third air pressure valve (21); the docking member (13) comprises a fixing ring (22) fixedly installed in the fixing pipe (15); a tension spring (23) is fixedly connected to the side of the fixing ring (22); a sealing ring (24) is slidably connected in the fixing pipe (15); one end of the tension spring (23) is fixedly connected to the sealing ring (24); one end of each of the first output pipe (3) and the second output pipe (4) can be slidably connected to one side of the sealing ring (24); The rotating box (8) is provided with a control member (25) for controlling the moving state of the sealing ring (24). The testing mechanism (14) comprises two groups of springs (31) fixedly installed in the rotating box (8). One end of the spring (31) is fixedly connected to an arc tube (32). A baffle (33) is inserted into the arc tube (32). The two groups of arc tubes (32) can be combined into a group of circular pipes. Both ends of the two groups of arc tubes (32) are provided with thread grooves (34) that can be threadedly connected to the threaded sleeve (16).

2. A one-way air tightness testing device for a one-way valve according to claim 1, characterized in that: The control member (25) comprises two groups of push rods (26) mounted on the rotating box (8), one end of the push rod (26) is provided with a first inclined surface (27), the side surface of the sealing ring (24) is provided with a second inclined surface (28) slidably fitted with the first inclined surface (27), the sealing ring (24) passes through the rotating box (8) and is slidably connected to the rotating box (8), the fixed tube (15) is provided with a sliding groove (29) slidably connected to the push rod (26), and the rotating box (8) is provided with a driving member (30) for driving the push rod (26) to move.

3. A one-way air tightness testing device for a one-way valve according to claim 2, characterized in that: The driving member (30) comprises a threaded rod (35) rotatably connected to the outer wall of the rotating box (8); a mounting rod (36) is provided on the rotating box (8); the threaded rod (35) passes through the mounting rod (36) and is threadedly connected to the mounting rod (36); one end of the two sets of pushing rods (26) are fixedly connected to the mounting rod (36).

4. A one-way air tightness testing device for a one-way valve according to claim 2, characterized in that: A first rubber ring (37) is fixedly connected inside the sliding groove (29), and second rubber rings (38) are fixedly connected to both ends of the fixed tube (15), and the outer wall of the second rubber ring (38) close to the side of the fixed box (5) is slidably fitted with the inner wall of the fixed box (5).

5. A one-way air tightness testing device for a one-way valve according to claim 1, characterized in that: A limiting rod (39) is fixedly connected to the side surface of the fixing ring (22), and the limiting rod (39) is slidably connected to the inner wall of the sealing ring (24) in a horizontal direction.

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