Double-channel pneumatic flow valve and leakage testing equipment

Abstract

The utility model provides a double-channel pneumatic flow valve and leakage testing equipment. The double-channel pneumatic flow valve comprises a valve body, an air inlet hole and two air outlet holes are formed in the outer side of the valve body, the air inlet hole and the air outlet holes are located in the two opposite sides of the valve body respectively, the valve body is provided with a switching channel, the switching channel is communicated with the two air outlet holes respectively, and the double-channel pneumatic flow valve further comprises a switching air cylinder and a plugging assembly. A cylinder body of the switching air cylinder is installed on the valve body, a piston rod of the switching air cylinder movably penetrates through the switching channel, the plugging assembly is located in the switching channel and connected with the piston rod, and the piston rod is used for driving the plugging assembly to move, so that the plugging assembly is used for sequentially cutting off airflow of the two air outlet holes. Because the leakage test air pressure and the starting air pressure of the switching air cylinder are mutually independent, even if the leakage test air pressure is less than 0.1 mpa, the air pressure value introduced into the switching air cylinder can be greater than the starting air pressure, so that the switching air cylinder can normally switch the leakage test inner cavity when the leakage test air pressure is less than 0.1 mpa, and the normal operation of product leakage test is ensured.

Description

Technical Field

[0001] The present disclosure relates to the technical field of leak testing equipment, and in particular to a dual-channel pneumatic flow valve and a leak testing equipment. Background Art

[0002] New energy vehicle box accessories have air-tightness requirements, so the products need to be leak-tested. During the leak test, each inner cavity is sealed and filled with gas.

[0003] In the related art, for products with two inner cavities, during leak testing, an air tube is aligned with the air inlets of the two inner cavities in turn for leak testing. However, this requires moving the air tube between the two inner cavities, resulting in low leak testing efficiency.

[0004] In order to improve the efficiency of leak testing, the relevant technology adopts pneumatic solenoid valve for leak testing. The starting air source of the solenoid valve and the leak testing air source share the same air source. For example, CN114382940A-pneumatic solenoid valve is adopted. The air source is controlled by the solenoid valve to enter the two inner cavities in turn. There is no need to move the air pipe during the leak testing process, thereby improving the leak testing efficiency.

[0005] However, the starting air pressure of the pneumatic battery valve is above 0.1 MPa, and the leak test air pressure of different products is different. For products with a leak test air pressure less than 0.1 MPa, the product's leak test air source will not be able to start the solenoid valve, resulting in the solenoid valve being unable to switch normally. Utility Model Content

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a dual-channel pneumatic flow valve and a leak test device that are not limited by the leak test air pressure and can be started when the leak test air pressure is less than 0.1 MPa.

[0007] The purpose of this disclosure is achieved through the following technical solutions:

[0008] A dual-channel pneumatic flow valve comprises a valve body, an air inlet hole and two air outlet holes are provided on the outer side of the valve body, the air inlet hole and the air outlet holes are respectively located on opposite sides of the valve body, the valve body is provided with a switching channel, the switching channel is respectively connected with the two air outlet holes, the dual-channel pneumatic flow valve also comprises a switching cylinder and a blocking assembly, the cylinder body of the switching cylinder is installed on the valve body, the piston rod of the switching cylinder is movably penetrated through the switching channel, the blocking assembly is located in the switching channel and connected to the piston rod, the piston rod is used to drive the blocking assembly to move, so that the blocking assembly is used to cut off the airflow of the two air outlet holes in sequence.

[0009] In one embodiment, the two air outlets are respectively a first air outlet and a second air outlet, the valve body includes a first valve body and a second valve body, the air inlet and the first air outlet are both provided in the first valve body, a first movable groove is provided on the outer side of the first valve body, the air inlet is connected to the first movable groove, the first valve body is provided with a first connecting hole on the inner wall of the first movable groove, and the first connecting hole is connected to the first air outlet;

[0010] The second valve body is connected to the first valve body and is arranged corresponding to the first movable groove. The second air outlet is provided in the second valve body. A second movable groove is provided on the side of the second valve body away from the first valve body. The second valve body is provided with an avoidance hole on the inner wall of the second movable groove. The avoidance hole is connected to the first movable groove. The blocking component is movably penetrated through the avoidance hole.

[0011] The second valve body is provided with a second connecting hole on the inner wall of the avoidance hole, the second connecting hole is connected with the second air outlet hole, the first movable groove, the avoidance hole and the second movable groove together form the switching channel; the blocking component is used to block the first connecting hole and the avoidance hole in turn, so that the blocking component is used to cut off the airflow of the two air outlet holes in turn.

[0012] In one embodiment, the blocking component comprises:

[0013] a sealing member, movably disposed in the second movable groove, the sealing member being fixedly connected to the piston rod, and the sealing member being used to block the connection between the second movable groove and the avoidance hole;

[0014] a connecting rod movably inserted into the avoidance hole, a gap existing between the connecting rod and the inner wall of the avoidance hole, and a first end of the connecting rod being fixedly connected to the sealing member; and

[0015] A switching member is movably arranged in the first movable groove, and there is a gap between the outer peripheral wall of the switching member and the inner peripheral wall of the first movable groove. The switching member is fixedly connected to the second end of the connecting rod, and one side of the switching member is used to block the first connecting hole, and the other side of the switching member is used to block the avoidance hole, so that the switching member is used to cut off the airflow of the two air outlets in sequence.

[0016] In one embodiment, the sealing member includes a sealing block and a sealing ring, wherein the sealing block is movably disposed in the second movable groove, the sealing block is fixedly connected to the piston rod, the sealing ring is protrudingly connected to a side of the sealing block adjacent to the avoidance hole, the sealing ring is disposed around the avoidance hole, and the sealing ring is used to abut against the inner wall of the second movable groove adjacent to the avoidance hole, so that the sealing member is used to block the connection between the second movable groove and the avoidance hole.

[0017] In one of the embodiments, a portion of the sealing ring is embedded in the sealing block.

[0018] In one embodiment, the switching member includes a switching plate, an elastic sealing ring and an elastic abutment ring. The switching plate is movably arranged in the first movable groove. There is a gap between the outer peripheral wall of the switching plate and the inner peripheral wall of the first movable groove. The elastic sealing ring and the elastic abutment ring are respectively located on two opposite sides of the switching plate. The elastic sealing ring and the elastic abutment ring are both protrudingly connected to the switching plate. The elastic sealing ring is arranged around the first connecting hole. The elastic sealing ring is used to abut against the inner wall of the first movable groove adjacent to the first connecting hole. The elastic abutment ring is arranged around the avoidance hole. The elastic abutment ring is used to abut against the inner wall of the first movable groove adjacent to the avoidance hole, so that the switching member is used to cut off the airflow of the two air outlets in sequence.

[0019] In one embodiment, the valve body further includes an elastic leak-proof ring, which is disposed between the first valve body and the second valve body, and is disposed around the first movable groove, and the elastic leak-proof ring is elastically abutted against the first valve body and the second valve body respectively.

[0020] In one embodiment, the dual-channel pneumatic flow valve further includes an in-place sensor, and the in-place sensor is connected to the cylinder body.

[0021] In one embodiment, the in-position sensor is a magnetic induction sensor.

[0022] A leak testing device comprises the dual-channel pneumatic flow valve described in any one of the above embodiments.

[0023] Compared with the prior art, the present invention has at least the following advantages:

[0024] Since the air source of the switching cylinder and the leak test do not need a common air source, that is, the switching cylinder and the valve body use one air source respectively, the leak test air pressure and the starting air pressure of the switching cylinder are independent of each other, that is, the switching action of the switching cylinder will not be restricted by the leak test air pressure, even if the leak test air pressure is less than 0.1 MPa, the air pressure value introduced into the switching cylinder can be greater than the starting air pressure, so that the switching cylinder can normally switch the leak test cavity when the leak test air pressure is less than 0.1 MPa, ensuring the normal progress of the product leak test. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of a dual-channel pneumatic flow valve according to an embodiment;

[0027] Figure 2 for Figure 1 The schematic diagram of the structure of the dual-channel pneumatic flow valve shown in another perspective;

[0028] Figure 3 for Figure 2 A cross-sectional view of the dual-channel pneumatic flow valve along line AA is shown;

[0029] Figure 4 for Figure 1 A partial cross-sectional view of a dual-channel pneumatic flow valve is shown.

[0030] : 10, dual-channel pneumatic flow valve; 100, valve body; 101, air inlet; 102, air outlet; 1021, first air outlet; 1022, second air outlet; 103, switching channel; 110, first valve body; 111, first movable groove; 112, first connecting hole; 120, second valve body; 121, second movable groove; 122, avoidance hole; 123, second connecting hole; 200, switching cylinder; 210, cylinder body; 220, piston rod; 300, blocking assembly; 310, sealing member; 311, sealing block; 312, sealing ring; 320, connecting rod; 330, switching member; 331, switching plate; 332, elastic blocking ring; 333, elastic abutment ring; 400, elastic leak-proof ring; 500, in-place sensor. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0034] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0035] like Figures 1 to 3 As shown, a dual-channel pneumatic flow valve 10 of an embodiment includes a valve body 100, and an air inlet hole 101 and two air outlet holes 102 are opened on the outer side of the valve body 100. The air inlet hole 101 and the air outlet holes 102 are respectively located on two opposite sides of the valve body 100. The air inlet hole 101 is used to connect with an external air source, and the two air outlet holes 102 are used to communicate with two inner cavities of the leak test product one by one.

[0036] like Figures 1 to 3 As shown, further, the valve body 100 is provided with a switching channel 103, and the switching channel 103 is respectively connected to the two air outlets 102. The dual-channel pneumatic flow valve 10 also includes a switching cylinder 200 and a sealing assembly 300. The cylinder body 210 of the switching cylinder 200 is installed on the valve body 100, and the piston rod 220 of the switching cylinder 200 is movably arranged in the switching channel 103. The sealing assembly 300 is located in the switching channel 103 and is connected to the piston rod 220. The piston rod 220 is used to drive the sealing assembly 300 to move, so that the sealing assembly 300 is used to cut off the airflow of the two air outlets 102 in sequence.

[0037] like Figures 1 to 3As shown, in this embodiment, the piston rod 220 of the switching cylinder 200 is used to drive the blocking assembly 300 to move between the blocking positions of the two air outlets 102. The two air outlets 102 are respectively the first air outlet 1021 and the second air outlet 1022. The two inner chambers of the product are respectively the first inner chamber and the second inner chamber. The first air outlet 1021 is connected to the first inner chamber, and the second air outlet 1022 is connected to the second inner chamber. During the leak test, the air inlet 101 is connected to an external air source, and the two air outlets 102 are connected to the two inner chambers of the product through air pipes in a one-to-one correspondence. First, the blocking assembly 300 blocks the connection between the switching channel 103 and the first air outlet 1021 under the action of the piston rod 220 to cut off the air source of the first air outlet 1021. At this time, the switching channel 103 is connected to the second air outlet 1022, so that the external air flow is only discharged through the second air outlet 1022, and the leak test operation of the second inner chamber is realized; when the leak test of the second inner chamber is completed After the leakage operation, the piston rod 220 drives the sealing assembly 300 to move, so that the sealing assembly 300 blocks the connection between the switching channel 103 and the second air outlet 1022 to cut off the air source of the second air outlet 1022. At this time, the switching channel 103 is connected to the first air outlet 1021, so that the external air flow is only discharged through the first air outlet 1021, thereby realizing the leakage test operation on the first inner cavity; in this way, the sealing assembly 300 is driven to move by the switching cylinder 200, thereby realizing the leakage test operation on the two inner cavities of the product.

[0038] The above-mentioned dual-channel pneumatic flow valve 10 does not need a common air source for the air source of the switching cylinder 200 and the leak test, that is, the switching cylinder 200 and the valve body 100 use an air source respectively, so that the leak test air pressure and the starting air pressure of the switching cylinder 200 are independent of each other, that is, the switching action of the switching cylinder 200 will not be restricted by the leak test air pressure, even if the leak test air pressure is less than 0.1 MPa, the air pressure value introduced into the switching cylinder 200 can be greater than the starting air pressure, so that the switching cylinder 200 can normally switch the leak test inner cavity when the leak test air pressure is less than 0.1 MPa, thereby ensuring the normal progress of the product leak test.

[0039] like Figure 3 and Figure 4As shown, in one embodiment, the two air outlet holes 102 are respectively a first air outlet hole 1021 and a second air outlet hole 1022, the valve body 100 includes a first valve body 110 and a second valve body 120, the air inlet hole 101 and the first air outlet hole 1021 are both opened on the first valve body 110, a first movable groove 111 is opened on the outer side of the first valve body 110, the air inlet hole 101 is connected with the first movable groove 111, the first valve body 110 is opened on the inner wall of the first movable groove 111 with a first connecting hole 112, and the first connecting hole 112 is connected with the first air outlet hole 1021. Further, the second valve body 120 is connected to the first valve body 110 and is arranged corresponding to the first movable groove 111, the second air outlet 1022 is provided in the second valve body 120, the second valve body 120 is provided with a second movable groove 121 on the side away from the first valve body 110, the second valve body 120 is provided with a position avoidance hole 122 on the inner wall of the second movable groove 121, the position avoidance hole 122 is connected with the first movable groove 111, and the blocking component 300 is movably penetrated in the position avoidance hole 122. Further, the second valve body 120 is provided with a second connecting hole 123 on the inner wall of the position avoidance hole 122, the second connecting hole 123 is connected with the second air outlet 1022, the first movable groove 111, the position avoidance hole 122 and the second movable groove 121 together form a switching channel 103; the blocking component 300 is used to sequentially block the first connecting hole 112 and the position avoidance hole 122, so that the blocking component 300 is used to sequentially cut off the airflow of the two air outlets 102. In this embodiment, the switching cylinder 200 is used to drive the blocking component 300 to move back and forth in the switching channel 103, so that the blocking component 300 is used to cut off the gas sources of the two gas outlets 102 in sequence.

[0040] like Figure 4 As shown, in one embodiment, the plugging assembly 300 includes a sealing member 310, a connecting rod 320 and a switching member 330. The sealing member 310 is movably disposed in the second movable groove 121. The sealing member 310 is fixedly connected to the piston rod 220. The sealing member 310 is used to block the connection between the second movable groove 121 and the avoidance hole 122 to prevent the leakage test gas from leaking through the second valve body 120, thereby ensuring the stability of the leakage test gas pressure. The connecting rod 320 is movably disposed in the avoidance hole 122, and there is a gap between the connecting rod 320 and the inner wall of the avoidance hole 122. The first end of the connecting rod 320 is fixedly connected to the sealing member 310. The switching member 330 is movably arranged in the first movable groove 111, and there is a gap between the outer peripheral wall of the switching member 330 and the inner peripheral wall of the first movable groove 111. The switching member 330 is fixedly connected to the second end of the connecting rod 320. One side of the switching member 330 is used to block the first connecting hole 112, and the other side of the switching member 330 is used to block the avoidance hole 122, so that the switching member 330 is used to cut off the airflow of the two air outlets 102 in sequence.

[0041] like Figure 4As shown, in this embodiment, due to the gap between the connecting rod 320 and the inner wall of the avoidance hole 122, when the switching member 330 does not block the avoidance hole 122, the gas can enter the second connecting hole 123 through the gap between the connecting rod 320 and the inner wall of the avoidance hole 122. Due to the gap between the outer circumferential wall of the switching member 330 and the inner circumferential wall of the first movable groove 111, when the switching member 330 does not block the first connecting hole 112, the gas can enter the first connecting hole 112 through the gap between the outer circumferential wall of the switching member 330 and the inner circumferential wall of the first movable groove 111.

[0042] like Figure 4 As shown, in one embodiment, the sealing member 310 includes a sealing block 311 and a sealing ring 312. The sealing block 311 is movably arranged in the second movable groove 121. The sealing block 311 is fixedly connected to the piston rod 220. The sealing ring 312 protrudes and is connected to a side of the sealing block 311 adjacent to the avoidance hole 122. The sealing ring 312 is arranged around the avoidance hole 122. The sealing ring 312 is used to abut against the inner wall of the second movable groove 121 adjacent to the avoidance hole 122, so that the sealing member 310 is used to block the connection between the second movable groove 121 and the avoidance hole 122.

[0043] like Figure 4 As shown, in one of the embodiments, a portion of the sealing ring 312 is embedded in the sealing block 311 , thereby improving the position stability of the sealing ring 312 .

[0044] like Figure 4 As shown, in one embodiment, the switching member 330 includes a switching plate 331, an elastic sealing ring 332 and an elastic abutting ring 333. The switching plate 331 is movably arranged in the first movable groove 111. There is a gap between the outer peripheral wall of the switching plate 331 and the inner peripheral wall of the first movable groove 111. The elastic sealing ring 332 and the elastic abutting ring 333 are respectively located on the opposite sides of the switching plate 331. The elastic sealing ring 332 and the elastic abutting ring 333 are both protrudingly connected to the switching plate 331. The elastic sealing ring 332 is arranged around the first connecting hole 112. The elastic sealing ring 332 is used to abut against the inner wall of the first movable groove 111 adjacent to the first connecting hole 112. The elastic abutting ring 333 is arranged around the avoidance hole 122. The elastic abutting ring 333 is used to abut against the inner wall of the first movable groove 111 adjacent to the avoidance hole 122, so that the switching member 330 is used to cut off the airflow of the two air outlets 102 in sequence.

[0045] like Figure 4As shown, in this embodiment, there is a gap between the outer circumferential wall of the switching plate 331 and the inner circumferential wall of the first active groove 111. When the switching member 330 does not block the first connecting hole 112, gas can enter the first connecting hole 112 through the gap between the outer circumferential wall of the switching plate 331 and the inner circumferential wall of the first active groove 111. When it is necessary to cut off the gas source of the first gas outlet 1021, the piston rod 220 pushes the switching plate 331, so that the elastic sealing ring 332 on the switching plate 331 abuts against the inner wall of the first active groove 111 near the first connecting hole 112, so that the switching member 330 seals the first connecting hole 112, thereby cutting off the gas source of the first gas outlet 1021. When it is necessary to cut off the gas source of the second air outlet 1022, the piston rod 220 pulls the switching plate 331, so that the elastic abutment ring 333 on the switching plate 331 abuts against the inner wall of the first movable groove 111 near the avoidance hole 122, so that the switching member 330 seals the avoidance hole 122, thereby cutting off the gas source of the second air outlet 1022.

[0046] like Figure 4 As shown, in one embodiment, the valve body 100 also includes an elastic leak-proof ring 400, which is arranged between the first valve body 110 and the second valve body 120. The elastic leak-proof ring 400 is arranged around the first movable groove 111, and the elastic leak-proof ring 400 is elastically abutted against the first valve body 110 and the second valve body 120 respectively, avoiding the problem of air leakage between the first valve body 110 and the second valve body 120 to ensure the stability of the leak test air pressure.

[0047] like Figure 1 As shown, in one embodiment, the dual-channel pneumatic flow valve 10 further includes an in-place sensor 500, which is connected to the cylinder body 210. In this embodiment, the in-place sensor 500 is used to be electrically connected to an external alarm, and the in-place sensor 500 detects whether the piston rod 220 is in place. When the piston rod 220 is not in place within a predetermined time, the in-place sensor 500 will output a signal to make the external alarm sound.

[0048] like Figure 1 As shown, in one embodiment, the position sensor 500 is a magnetic induction sensor.

[0049] The present disclosure further provides a leak testing device, comprising the dual-channel pneumatic flow valve 10 of any one of the above embodiments.

[0050] Compared with the prior art, the present invention has at least the following advantages:

[0051] Since the air source of the switching cylinder 200 and the leak test do not need a common air source, that is, the switching cylinder 200 and the valve body 100 use an air source respectively, the leak test air pressure and the starting air pressure of the switching cylinder 200 are independent of each other, that is, the switching action of the switching cylinder 200 will not be restricted by the leak test air pressure, even if the leak test air pressure is less than 0.1 MPa, the air pressure value introduced into the switching cylinder 200 can be greater than the starting air pressure, so that the switching cylinder 200 can normally switch the leak test inner cavity when the leak test air pressure is less than 0.1 MPa, ensuring the normal progress of the product leak test.

[0052] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. A dual-channel pneumatic flow valve, comprising a valve body, wherein an air inlet hole and two air outlet holes are provided on the outer side of the valve body, wherein the air inlet hole and the air outlet holes are respectively located on opposite sides of the valve body, wherein: The valve body is provided with a switching channel, and the switching channel is respectively connected to the two air outlets. The dual-channel pneumatic flow valve also includes a switching cylinder and a blocking assembly. The cylinder body of the switching cylinder is installed on the valve body, and the piston rod of the switching cylinder is movably penetrated through the switching channel. The blocking assembly is located in the switching channel and connected to the piston rod. The piston rod is used to drive the blocking assembly to move, so that the blocking assembly is used to cut off the airflow of the two air outlets in sequence.

2. The dual-channel pneumatic flow valve according to claim 1, characterized in that: The two air outlets are respectively a first air outlet and a second air outlet, the valve body includes a first valve body and a second valve body, the air inlet and the first air outlet are both provided in the first valve body, a first movable groove is provided on the outer side of the first valve body, the air inlet is connected with the first movable groove, the first valve body is provided with a first connecting hole on the inner wall of the first movable groove, the first connecting hole is connected with the first air outlet; The second valve body is connected to the first valve body and is arranged corresponding to the first movable groove. The second air outlet is provided in the second valve body. A second movable groove is provided on the side of the second valve body away from the first valve body. The second valve body is provided with an avoidance hole on the inner wall of the second movable groove. The avoidance hole is connected to the first movable groove. The blocking component is movably penetrated through the avoidance hole. The second valve body is provided with a second connecting hole on the inner wall of the avoidance hole, the second connecting hole is connected with the second air outlet hole, the first movable groove, the avoidance hole and the second movable groove together form the switching channel; the blocking component is used to block the first connecting hole and the avoidance hole in turn, so that the blocking component is used to cut off the airflow of the two air outlet holes in turn.

3. The dual-channel pneumatic flow valve according to claim 2, characterized in that: The blocking component comprises: a sealing member, movably disposed in the second movable groove, the sealing member being fixedly connected to the piston rod, and the sealing member being used to block the connection between the second movable groove and the avoidance hole; a connecting rod movably inserted into the avoidance hole, a gap existing between the connecting rod and the inner wall of the avoidance hole, and a first end of the connecting rod being fixedly connected to the sealing member; and A switching member is movably arranged in the first movable groove, and there is a gap between the outer peripheral wall of the switching member and the inner peripheral wall of the first movable groove. The switching member is fixedly connected to the second end of the connecting rod, and one side of the switching member is used to block the first connecting hole, and the other side of the switching member is used to block the avoidance hole, so that the switching member is used to cut off the airflow of the two air outlets in sequence.

4. The dual-channel pneumatic flow valve according to claim 3, characterized in that: The sealing component includes a sealing block and a sealing ring. The sealing block is movably arranged in the second movable groove. The sealing block is fixedly connected to the piston rod. The sealing ring is protrudingly connected to a side of the sealing block adjacent to the avoidance hole. The sealing ring is arranged around the avoidance hole. The sealing ring is used to abut against the inner wall of the second movable groove adjacent to the avoidance hole, so that the sealing component is used to block the connection between the second movable groove and the avoidance hole.

5. The dual-channel pneumatic flow valve according to claim 4, characterized in that: Part of the sealing ring is embedded in the sealing block.

6. The dual-channel pneumatic flow valve according to claim 3, characterized in that: The switching member includes a switching plate, an elastic sealing ring and an elastic abutment ring. The switching plate is movably arranged in the first movable groove. There is a gap between the outer peripheral wall of the switching plate and the inner peripheral wall of the first movable groove. The elastic sealing ring and the elastic abutment ring are respectively located on two opposite sides of the switching plate. The elastic sealing ring and the elastic abutment ring are both protrudingly connected to the switching plate. The elastic sealing ring is arranged around the first connecting hole. The elastic sealing ring is used to abut against the inner wall of the first movable groove adjacent to the first connecting hole. The elastic abutment ring is arranged around the avoidance hole. The elastic abutment ring is used to abut against the inner wall of the first movable groove adjacent to the avoidance hole, so that the switching member is used to cut off the airflow of the two air outlets in sequence.

7. The dual-channel pneumatic flow valve according to claim 2, characterized in that: The valve body further comprises an elastic anti-leakage ring, which is arranged between the first valve body and the second valve body, and is arranged around the first movable groove, and the elastic anti-leakage ring is elastically abutted against the first valve body and the second valve body respectively.

8. The dual-channel pneumatic flow valve according to claim 1, characterized in that: The dual-channel pneumatic flow valve further includes an in-place sensor connected to the cylinder body.

9. The dual-channel pneumatic flow valve according to claim 8, characterized in that: The in-position sensor is a magnetic induction sensor.

10. A leak testing device, characterized in that: A dual-channel pneumatic flow valve comprising any one of claims 1 to 9.

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