Pneumatic differential pressure leak detection control valve island

Abstract

The pneumatic differential pressure leak detection control valve terminal comprises a differential pressure sensor, a comparison end and a test end, the comparison end and the test end are communicated with the two ends of the differential pressure sensor respectively, and a protection valve is further connected between the comparison end and the test end. The comparison end is communicated with the air inlet end, and the test end is communicated with the air inlet end of the pneumatic element. According to the pneumatic differential pressure leakage detection control valve terminal, quick leakage detection of small-sized pneumatic original parts in the pneumatic original parts and deflation after detection are completed are completed, and various detections such as pulse action, working pressure range and pressure range of the pneumatic original parts can be completed at the same time. The pneumatic component does not need to be disassembled and assembled to different testing devices to complete different testing processes, so that the testing efficiency and precision of the pneumatic component can be effectively improved; by arranging the protective valve, the differential pressure sensor can be prevented from being lost due to excessive differential pressure caused by a fault state in the pneumatic differential pressure leak detection control valve terminal.

Description

Technical Field

[0001] The invention relates to the technical field of pneumatic control elements, and in particular to a pneumatic differential pressure leak detection control valve island. Background Art

[0002] The pneumatic differential pressure leak detection control valve island belongs to the field of pneumatic control technology and can be used for leakage testing of pneumatic components. However, the existing leakage inspection of pneumatic components can be carried out by flow sensors, rotor flowmeter measurement methods or direct measurement with pressure sensors. When in use, the above mode only performs air tightness testing on a single product to be tested, and cannot be compared with standard parts at the same time under the same environment. Environmental factors may lead to poor detection accuracy and a long detection time. For example, the pressure difference change caused by the expansion of the product is identified as a leak, and during the test, the pressure at the comparison end needs to be adjusted to a specified value to reduce the error between the two. Therefore, the present invention proposes a pneumatic differential pressure leak detection control valve island for product leakage testing to solve the above problems. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art. The present invention proposes a pneumatic differential pressure leak detection control valve island, which is applied to the test process of a pneumatic rotary joint to provide a basis for intuitively judging the sealing performance and leakage amount of the pneumatic rotary joint.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a pneumatic differential pressure leak detection control valve island, comprising:

[0005] An integrated valve block, in which a plurality of gas passages are opened;

[0006] Compare the gas volume, temporarily store and output the test pressure to one end of the differential pressure sensor;

[0007] A differential pressure sensor, wherein two ends of the differential pressure sensor are respectively connected to a comparison gas volume and an output channel provided on the integrated valve block;

[0008] The plate-type gas control valve is respectively connected with the output end of the comparison gas volume and the output channel;

[0009] A plurality of valve bodies are fixedly arranged on the integrated valve block and communicated with the gas path, so as to regulate the air intake of the comparison gas volume and the opening and closing state of the plate-type gas control valve by the valve bodies.

[0010] Further, the valve body comprises a first valve body, a second valve body and a third valve body, the first valve body, the second valve body and the third valve body are fixedly arranged side by side on the integrated valve block, and the valve body is a two-position two-way solenoid valve;

[0011] The first valve body is connected to the air inlet passage and the comparison air volume provided in the integrated valve block;

[0012] The second valve body is connected to the air inlet channel and the air outlet channel provided in the integrated valve block;

[0013] The third valve body is connected to the air inlet passage provided in the integrated valve block and the valve cavity of the plate-type air-controlled valve, and is used for regulating the opening and closing of the plate-type air-controlled valve.

[0014] Furthermore, the output end of the first valve body is connected to the comparison gas capacitor, and the end of the differential pressure sensor close to the comparison gas capacitor is the comparison end, which is connected to the comparison gas capacitor through a combination pad, and the combination pad is fixed to the comparison end of the differential pressure sensor with a through-plate screw.

[0015] Furthermore, the plate-type air-controlled valve includes a valve cavity and a valve core movably arranged in the valve cavity, and a first air inlet and a second air inlet are respectively provided at both ends in the length direction of the valve cavity, for applying air pressure to push the valve core to reciprocate in the valve cavity, and a third air inlet is provided in the thickness direction of the valve cavity; the third valve body and the comparison air volume are respectively connected to the first air inlet and the second air inlet, and the second valve body is connected to the third air inlet.

[0016] Furthermore, one end of the differential pressure sensor connected to the output channel is a test end, and the test end is connected to the air path channel via a clamping plate, and the clamping plate is fixed to the test end of the differential pressure sensor by a through-plate screw.

[0017] Furthermore, the first valve body, the second valve body and the third valve body are sequentially arranged on the integrated valve block, the air intake passage is opened based on the width direction of the integrated valve block, and the air intake passage is connected with the first valve body, the second valve body and the third valve body at the same time.

[0018] Furthermore, a fourth valve body is included, which is arranged on one side of the third valve body in sequence and connected to the output channel and the exhaust channel. The exhaust channel is opened based on the length direction of the integrated valve block.

[0019] Compared with the prior art, the beneficial effects of the present invention include:

[0020] 1) The pneumatic differential pressure leak detection control valve island is used to complete the inflation, pressure maintenance, detection and deflation processes of the pneumatic components. Multiple tests of the pneumatic components can be completed at the same time. There is no need to disassemble the pneumatic components to different test equipment to complete different test processes. This can effectively improve the test efficiency of the pneumatic components and reduce the labor and test equipment costs.

[0021] 2) By providing a protection valve, on the one hand, it is possible to prevent the situation in which the differential pressure at both ends of the differential pressure sensor is too large due to the fault state in the first, second and third solenoid valves in the pneumatic differential pressure leak detection control valve island; on the other hand, the protection valve can be used to test the leakage of the pneumatic component within the test pressure range, thereby greatly reducing the test time while improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the accompanying drawings, the same reference numerals are used to refer to the same components. Among them:

[0023] Figure 1 The schematic diagram shows the top view of the pneumatic differential pressure leak detection control valve island;

[0024] Figure 2 The cross-sectional structure of the integrated valve block is schematically shown.

[0025] Numbers in the figure: 1-integrated valve block, 2-comparison gas volume, 3-differential pressure sensor, 4-protection valve, 5-first solenoid valve, 6-second solenoid valve, 7-third solenoid valve, 8-fourth solenoid valve, 9-intake channel, 10-output channel, 11-exhaust channel, 12-first channel, 13-second channel, 14-third channel, 15-fourth channel, 16-control port, 17-first air inlet, 18-second air inlet. DETAILED DESCRIPTION

[0026] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction to the technical solution of the present invention.

[0027] Figure 1 The schematic diagram shows the top view of the pneumatic differential pressure leak detection control valve island. Figure 1As shown, it includes an integrated valve block 1 and a comparison gas volume 2, a differential pressure sensor 3, a plate-type gas control valve and several solenoid valves for control arranged on the integrated valve block 1. The figure schematically shows the cross-sectional structure of the integrated valve block 1. As shown in the figure, several gas paths are opened in the aforementioned integrated valve block 1, so that the gas used for testing flows completely in the integrated valve block 1. Compared with the conventional way of connecting through pipelines, the integrated valve block 1 depends on its own strength and can effectively avoid the situation of pipeline rupture. Moreover, since the pipelines are all opened inside the integrated valve block 1, only fixing holes and interfaces are arranged on the outside. During the connection process, it is completely dependent on the aforementioned fixing holes and interfaces, which can greatly reduce the difficulty of connection.

[0028] The following describes the arrangement of the comparison gas volume 2, the differential pressure sensor 3, the plate-type gas control valve and several valve bodies for control on the integrated valve block 1. The differential pressure sensor 3 is fixedly arranged in the middle of the integrated valve block 1, the comparison gas volume 2 is fixedly arranged close to one end of the differential pressure sensor 3, the valve body is fixedly arranged close to the comparison gas volume 2 and the differential pressure sensor 3, and the plate-type gas control valve is fixedly arranged at the free position of the integrated valve block 1.

[0029] The two ends of the aforementioned differential pressure sensor 3 are respectively connected to the comparison gas container 2 and the output channel 10 opened on the integrated valve block 1. The comparison gas container 2 is used to store the test pressure and output the test pressure to the comparison end of the differential pressure sensor 3. A number of solenoid valves are fixedly arranged on the integrated valve block 1 and connected to the air path channel, and the solenoid valves are used to regulate the air intake of the comparison gas container 2 and the opening and closing state of the protection valve 4. The protection valve 4 is a plate-type two-position two-way air control valve. The plate-type air control valve is in a normally open state, which can balance the test pressure at both ends of the differential pressure sensor 3 and protect the differential pressure sensor 3; and when it is necessary to perform a pressure holding test on the pneumatic component to be tested, the plate-type air control valve can be closed to disconnect the test end of the differential pressure sensor 3 from the comparison end. At this time, if the pneumatic component to be tested leaks, the pressure at the test end is significantly lower than the pressure at the comparison end, and the pressure holding test can be completed. If no leakage occurs, the test pressures at the test end and the comparison end remain consistent.

[0030] The aforementioned solenoid valve comprises a first solenoid valve 5, a second solenoid valve 6 and a third solenoid valve 7, which are fixedly arranged side by side on the integrated valve block 1. The aforementioned first solenoid valve 5, the second solenoid valve 6 and the fourth solenoid valve 8 are all two-position two-way solenoid valves, and the third solenoid valve 7 is a two-position three-way solenoid valve; the air inlet end of the first solenoid valve 5 is connected to the air inlet channel 9 provided in the integrated valve block 1, and the output end of the first solenoid valve 5 is connected to the comparison gas volume 2 and the second air inlet 18 in the protection valve 4 through the first channel 12 provided in the integrated valve block 1, and at the same time, the second channel 139 provided on the comparison gas volume 2 and the test end clamp plate is connected to the differential pressure sensor The first channel 12 is cross-connected through the comparison gas volume 2, the air inlet of the second solenoid valve 6 is connected with the air inlet channel 9 opened in the integrated valve block 1, and the output port of the second solenoid valve 6 is connected with the output port through the output channel 10, the output port of the second solenoid valve 6 is respectively connected with the output end of the differential pressure sensor 3 and the first air inlet 17 in the protection valve 4 through the third channel 14, the channel provided in the integrated valve block 1 is cross-connected with the third channel 149, the air inlet of the third solenoid valve 7 is connected with the air inlet channel 9 opened in the integrated valve block 1, and the output port of the third solenoid valve 7 is connected with the fourth channel 15 opened in the integrated valve block 1 and the control port 16 of the protection valve 4, which is used for opening and closing the protection valve 4. The aforementioned first solenoid valve 5, second solenoid valve 6 and third solenoid valve 7 are arranged in sequence on the integrated valve block 1, and the intake channel 9 is based on the width direction of the integrated valve block 1 and the intake channel 9 is connected with the first solenoid valve 5, the second solenoid valve 6 and the third solenoid valve 7 at the same time, that is, the test pressure can be supplied to the first solenoid valve 5, the second solenoid valve 6 and the third solenoid valve 7 at the same time through the intake channel 9, and then their directions are determined according to their respective opening and closing, thereby completing the relevant transportation or control process.

[0031] The following is a detailed description of the aforementioned valve body arrangement. The valve body includes a first valve body, a second valve body and a third valve body, which are fixedly arranged side by side on the integrated valve block 1, and the aforementioned first valve body, second valve body and third valve body are two-position two-way solenoid valves; the first valve body is connected to the air intake channel 9 and the comparison gas volume 2 provided in the integrated valve block 1, the second valve body is connected to the air intake channel 9 and the output channel 10 provided in the integrated valve block 1, and the third valve body is connected to the air intake channel 9 and the valve cavity of the plate-type air control valve provided in the integrated valve block 1, and is used to control the opening and closing of the plate-type air control valve. The aforementioned first valve body, second valve body and third valve body are arranged in sequence on the integrated valve block 1, and the air intake channel 9 is based on the width direction of the integrated valve block 1 and the air intake channel 9 is connected with the first valve body, the second valve body and the third valve body at the same time, that is, the air intake channel 9 can simultaneously supply test pressure to the first valve body, the second valve body and the third valve body, and then determine their destination according to their respective opening and closing, thereby completing the relevant transportation or regulation process.

[0032] It is worth noting that a fourth solenoid valve 8 is also included, which is arranged on one side of the third solenoid valve 7 in sequence, one end of the fourth solenoid valve 8 is connected to the output channel 10, and the other end of the fourth solenoid valve 8 is connected to the exhaust channel 11. The aforementioned output channel 10 and exhaust channel 11 are both opened based on the length direction of the integrated valve block 1.

[0033] The output end of the aforementioned first solenoid valve 5 is connected to the comparison gas container 2, and the end of the differential pressure sensor 3 close to the comparison gas container 2 is the comparison end, and the comparison test pressure is provided to it by the comparison gas container 2. The comparison gas container 2 and the differential pressure sensor 3 are connected and connected by a combination pad, and the aforementioned combination pad is fixed to the comparison end of the differential pressure sensor 3 by a through-plate screw, and the comparison end is connected to the second channel 139 by a clamping plate. The end of the differential pressure sensor 3 connected to the output channel 10 is the test end, and the test end is connected to the third channel 149 of the gas path channel by a clamping plate, and the aforementioned clamping plate is fixed to the test end of the differential pressure sensor 3 by a through-plate screw.

[0034] The following is a detailed description of the protection valve 4, i.e., the plate-type air-controlled valve. The plate-type air-controlled valve includes a valve core movably arranged in the valve cavity, and a control port 16, a first air inlet 17, and a second air inlet 18 are respectively provided in the length direction of the valve cavity. The position switching of the valve core in the valve cavity is completed by inputting control compressed air into the control port 16 provided on the protection valve 4, wherein the control port 16 of the protection valve 4 is connected to the output port of the third solenoid valve 7 for regulating its on-off, and the first air inlet 17 of the protection valve 4 is simultaneously connected to the output port of the second solenoid valve 6 and the test end of the differential pressure sensor 3, and the second air inlet 18 of the protection valve 4 is connected to the comparison gas volume 2 through the air path channel provided in the integrated valve block 1, and the first air inlet 17 and the second air inlet 18 of the protection valve 4, i.e., the plate-type air-controlled valve, are supplied with air through the provided air path channel to keep it in a normally open state. A control port 16 is provided in the thickness direction of the valve cavity, and the output end of the second solenoid valve 6 is connected to the control port 16, and the control compressed air is supplied to the protection valve 4 through the control port 16. In actual use, when the protection valve 4, i.e., the plate-type air-controlled valve, is in the normally open state, the valve core in the valve cavity is in a position close to the control port 16, and the third solenoid valve 7 is in the closed state. After the test pressure is sent in through the second air inlet 18 by the comparison air volume 2, since there is no compressed air in the control port 16, the first and second air inlets 18 are connected, so that the test end of the differential pressure sensor 3 is also connected with the comparison end of the differential pressure sensor 3, and the pressure is completely consistent with the test end; and when the third solenoid valve 7 is in the open state, the compressed air flows from the output port of the third solenoid valve 7 into the control port 16 of the protection valve 4, i.e., the plate-type air-controlled valve, and the valve core in the protection valve 4 moves to the right, and the first air inlet 17 and the second air inlet are in the cut-off state, so that the comparison end and the test end of the differential pressure sensor 3 are in the isolated state, and the leakage of the test piece can be detected at this time.

[0035] The following is a detailed description of the test process of the pneumatic component test device. As shown on the control monitoring panel, the test process includes the inflation process, the pressure maintenance process, the detection process and the deflation process. Figure 1 , 1DT shown is the first solenoid valve 5 , 2DT is the second solenoid valve 6 , 3DT is the third solenoid valve 7 , and 4DT is the fourth solenoid valve 8 .

[0036] Inflation process

[0037] During the inflation process, 1DT and 2DT are in the open state, while 3DT is closed and does not act, and the plate-type air control valve is in the normally open state, and 4DT is in the closed state. The test pressure flows through 1DT, the plate-type air control valve, and the third channel 14 to the output channel 10 to complete the output, so as to complete the inflation process of the pneumatic component being tested.

[0038] Pressure holding process

[0039] During this process, 1DT and 2DT are opened to complete the inflation process and then closed to assist in completing the pressure-maintaining process of the pneumatic component being tested.

[0040] Leakage detection process

[0041] In this process, 1DT is in a closed state, 2DT is opened and then restored to a closed state, and then 3DT is opened to close the plate-type air control valve. After 3 to 5 seconds, the leakage amount of the pneumatic component under test is obtained by the differential pressure sensor 3.

[0042] Deflation process

[0043] During this process, 1DT and 2DT are in the closed state, 3DT and 4DT are opened, and the deflation process of the pneumatic component under test is completed.

[0044] Pulse test process

[0045] In this process, 3DT is in a normally closed state, and the plate-type air control valve is in a normally open state. 1DT and 2DT are regulated to open to complete the inflation process. At this time, 4DT is in a closed state. Then 1DT and 2DT are closed and 4DT is opened to complete the deflation process. The aforementioned opening and closing processes of 1DT, 2DT and 4DT are cycled to form a cyclic inflation and deflation pulse. The cycle interval is several seconds. During this process, the rotational jump detection is continuously maintained, and the leakage amount of the pneumatic component under test is obtained by the differential pressure sensor 3. That is, the inflation process and the deflation process are cycled at fixed time intervals.

[0046] The technical scope of the present invention is not limited to the contents in the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of ​​the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A pneumatic differential pressure leak detection control valve island, characterized in that: It comprises a differential pressure sensor (3) and a comparison end and a test end respectively connected to the two ends of the differential pressure sensor (3), and a protection valve (4) is also connected between the comparison end and the test end; the comparison end is connected to the air inlet end, and the test end is connected to the air inlet end of the pneumatic element.

2. The pneumatic differential pressure leak detection control valve island according to claim 1, characterized in that: A comparison gas container (2) for storing test gas is provided between the comparison end and the air inlet end, and a first electromagnetic valve (5) is used to regulate the on-off between the air inlet end and the comparison gas container (2).

3. The pneumatic differential pressure leak detection control valve island according to claim 1, characterized in that: The differential pressure sensor (3), the comparison gas volume (2) and the first solenoid valve (5) are all fixedly arranged on the integrated valve block (1); the first solenoid valve (5) is a two-position two-way solenoid valve; an air intake channel (9), a first channel (12) and a second channel (13) are provided in the integrated valve block (1); the input end of the first solenoid valve (5) is connected to the air intake channel (9); the output end of the first solenoid valve (5) is connected to the first channel (12), and is connected to the comparison gas volume (2) and one end of the protection valve (4) through the first channel (12); the comparison gas volume (2) is connected to the comparison end of the differential pressure sensor (3) through the second channel (13); the first channel (12) and the second channel (13) are cross-connected through the comparison gas volume (2).

4. The pneumatic differential pressure leak detection control valve island according to claim 1, characterized in that: The valve assembly further comprises a second solenoid valve (6), a third solenoid valve (7) and a fourth solenoid valve (8); the second solenoid valve (6) and the fourth solenoid valve (8) are two-position two-way solenoid valves; the third solenoid valve (7) is a two-position three-way solenoid valve; the first solenoid valve (5), the second solenoid valve (6) and the third solenoid valve (7) are all connected to the air intake end via the air intake passage (9); the first solenoid valve (5), the second solenoid valve (6), the third solenoid valve (7) and the fourth solenoid valve (8) are arranged side by side on the integrated valve block (1).

5. The pneumatic differential pressure leak detection control valve island according to claim 1, characterized in that: The protection valve (4) comprises a valve cavity and a valve core movably arranged in the valve cavity, and a control port (16) and a second air inlet (18) are respectively provided at the two ends of the valve cavity in the length direction, for applying air pressure to push the valve core to reciprocate in the valve cavity, and a first air inlet (17) is provided in the thickness direction of the valve cavity; the third solenoid valve (7) and the comparison air container (2) are respectively connected to the first air inlet (17) and the second air inlet (18), and the second solenoid valve (6) is connected to the third air inlet.

6. The pneumatic differential pressure leak detection control valve island according to claim 1, characterized in that: The output end of the second solenoid valve (6) is connected to the output channel (10) and the test end of the differential pressure sensor (3); the output channel (10) is connected to the output end of the pneumatic differential pressure leak detection control valve island; the output channel (10) and the output end of the pneumatic differential pressure leak detection control valve island are both arranged on the integrated valve block (1); one end of the third channel (14) is connected to the other test end of the differential pressure sensor (3) and the first air inlet (17) of the protection valve (4); and the output channel (10) and the third channel (14) are cross-connected; the output channel (10), the output end of the pneumatic differential pressure leak detection control valve island and the third channel (14) are all arranged on the integrated valve block (1).

7. The pneumatic differential pressure leak detection control valve island according to claim 1, characterized in that: The output end of the third solenoid valve (7) is connected to a fourth channel (15), and the fourth channel (15) is connected to a control port (16) of the protection valve (4) for regulating the opening and closing of the protection valve (4); the fourth channel (15) is provided on the integrated valve block (1).

8. The pneumatic differential pressure leak detection control valve island according to claim 1, characterized in that: One end of the fourth solenoid valve (8) is in communication with the output channel (10), and the other end is in communication with the exhaust channel (11); the output channel (10) and the exhaust channel (11) are both provided on the integrated valve block (1).

Images