Device for testing service life of pneumatic diaphragm valve

Abstract

A pneumatic diaphragm valve service life testing device comprises an air source and a control valve connected with the air source, the control valve is divided into two paths, one path is a control air path, and the other path is a testing air path. The test gas circuit is used for connecting at least one diaphragm valve group, valve bodies of tested pneumatic diaphragm valves in the diaphragm valve group are sequentially connected in series, and the tail end of the valve body of the tested pneumatic diaphragm valve located at the last position is plugged by a plug. The control air path is provided with an electromagnetic valve controlled by the PLC, and an air outlet of the electromagnetic valve is used for being connected with a pneumatic switch air inlet of each tested pneumatic diaphragm valve in the diaphragm valve group. The testing device can test the service life of the pneumatic diaphragm valve in batches, and the testing efficiency is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of valve testing, and particularly relates to a service life testing device for a pneumatic diaphragm valve. Background Technique

[0002] A pneumatic diaphragm valve is a special form of a shut-off valve. The opening and closing member of the pneumatic diaphragm valve is a diaphragm made of a soft material, which separates the inner cavity of the valve body from the inner cavity of the valve cover and the driving components. The most prominent feature of the pneumatic diaphragm valve is that the diaphragm separates the lower inner cavity of the valve body from the upper inner cavity of the valve cover, so that the parts such as the valve stem and valve flap above the diaphragm are not corroded by the medium. Conversely, the medium in the inner cavity of the valve body is not polluted by the outside world. Therefore, the pneumatic diaphragm valve is widely used in the medium conveying pipelines with high cleanliness requirements.

[0003] The service life of a pneumatic diaphragm valve is an important indicator of the quality of the pneumatic diaphragm valve. The existing service life tests of pneumatic diaphragm valves generally adopt a single test method, that is, for each pneumatic diaphragm valve, tests are carried out one by one. Such a test method has low test efficiency. Especially in the case where there are multiple specifications of pneumatic diaphragm valves, it is not only inconvenient to operate, but also the test efficiency will be even lower. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a service life testing device for a pneumatic diaphragm valve, which can batch test the service life of pneumatic diaphragm valves and has high test efficiency.

[0005] To solve the above technical problem, the utility model adopts the following technical scheme:

[0006] A service life testing device for a pneumatic diaphragm valve includes a gas source, a control valve connected to the gas source. The control valve is divided into two paths, one is a control gas path, and the other is a test gas path. The test gas path is used to connect at least one diaphragm valve group in parallel. The valve bodies of the tested pneumatic diaphragm valves in the diaphragm valve group are connected in series in turn, and the end of the valve body of the tested pneumatic diaphragm valve at the last position is blocked by a plug; an electromagnetic valve controlled by a PLC controller is arranged on the control gas path, and the air outlet of the electromagnetic valve is used to connect the pneumatic switch air inlets of the tested pneumatic diaphragm valves in the diaphragm valve group respectively.

[0007] By adopting the above technical scheme, the gas source is divided into two paths, one is a control gas path, and the other is a test gas path. The control gas path uses a PLC controller to control the electromagnetic valve, so that the air outlet of the electromagnetic valve supplies gas to the pneumatic switch air inlets of each tested pneumatic diaphragm valve at a high frequency. Therefore, multiple tested pneumatic diaphragm valves can be controlled to open and close at a high frequency at the same time; the test gas path provides stable test gas and air pressure to each tested pneumatic diaphragm valve connected in series, forming good and stable test conditions, thus finally realizing that multiple pneumatic diaphragm valves can be batch tested at the same time, improving the test efficiency.

[0008] In the present utility model, a pressure regulating valve is further provided on the control air path in front of the solenoid valve. The pressure regulating valve can regulate the air pressure of the control air path to obtain the control air pressure required for the pneumatic on-off operation of each pneumatic diaphragm valve to be measured.

[0009] In the present utility model, a barometer is further provided on the control air path in front of the pressure regulating valve. Therefore, the air pressure state of the current air path can be known by observing the reading of the barometer, so as to further cooperate with the pressure regulating valve to further regulate the air pressure of the control air path.

[0010] In the present utility model, the test air path is connected in parallel with multiple diaphragm valve groups. More pneumatic diaphragm valves can be added to the test simultaneously, improving the test efficiency.

[0011] In the present utility model, the pneumatic diaphragm valves to be measured in the same diaphragm valve group have the same specifications. Since the pneumatic diaphragm valves to be measured in the same group have the same specifications, the pneumatic diaphragm valves to be measured do not affect each other, ensuring the consistency of the test conditions in the same group.

[0012] In the present utility model, the pneumatic diaphragm valves to be measured in different diaphragm valve groups have different specifications. Since different diaphragm valve groups adopt different specifications and the pneumatic diaphragm valves to be measured in each group do not affect each other, pneumatic diaphragm valves of different specifications can be detected simultaneously on a pneumatic diaphragm valve life test device, further improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present utility model will be further described in detail below in conjunction with the drawings and specific embodiments:

[0014] Figure 1 is a schematic diagram of the present utility model.

[0015] Reference numerals in the figure: 1, air source; 2, control valve; 3, control air path; 3-1, pressure gauge; 3-2, pressure regulating valve; 3-3, solenoid valve; 3-4, PLC controller; 4, test air path; 5, diaphragm valve group; 6, pneumatic diaphragm valve; 7, plug. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] As Figure 1 shown, the pneumatic diaphragm valve life test device of the present utility model includes an air source 1 and a control valve 2 connected to the air source. The control valve 2 is divided into two paths, one is a control air path 3, and the other is a test air path 4.

[0017] The test gas path 4 is connected in parallel with multiple diaphragm valve groups 5. Each diaphragm valve group 5 is composed of multiple tested pneumatic diaphragm valves 6 connected in series in sequence. The end of the valve body of the tested pneumatic diaphragm valve 6 located at the last position is blocked by a plug 7. Since the test gas path 4 provides stable test gas and air pressure to each of the serially connected tested pneumatic diaphragm valves 6, good and stable test conditions are formed.

[0018] A barometer 3-1, a pressure regulating valve 3-2, and a solenoid valve 3-3 controlled by a PLC controller 3-4 are sequentially arranged on the control gas path 3. The air outlet of the solenoid valve 3-3 is used to connect to the pneumatic switch air inlets of the respective tested pneumatic diaphragm valves 6 of the diaphragm valve group. The air pressure state of the current gas path can be known by observing the reading of the barometer 3-1, and then the air pressure of the control gas path 3 can be adjusted in cooperation with the pressure regulating valve 6 to obtain the control air pressure required for the pneumatic switch operation of each tested pneumatic diaphragm valve 6. The PLC controller 3-4 controls the opening and closing of the solenoid valve 3-3, and the switching frequency is generally controlled at 30 times / min, so that the air outlet of the solenoid valve 3-3 supplies gas to the pneumatic switch air inlets of each tested pneumatic diaphragm valve 6 at a high frequency. Therefore, multiple tested pneumatic diaphragm valves 6 can be controlled to open and close simultaneously at a high frequency.

[0019] By sensing whether there is gas leakage around the valve body of each tested pneumatic diaphragm valve 6, it is judged whether the valve is damaged, thus achieving the effect of batch testing multiple pneumatic diaphragm valves 6 simultaneously and improving the test efficiency.

[0020] The test gas path 4 is connected in parallel with multiple diaphragm valve groups 5. More pneumatic diaphragm valves 6 can be added to the test simultaneously, improving the test efficiency.

[0021] The specifications of the tested pneumatic diaphragm valves 6 in the same diaphragm valve group 5 are the same. Since the specifications of the tested pneumatic diaphragm valves 6 in the same group are the same, the tested pneumatic diaphragm valves 6 do not affect each other, ensuring the consistency of the test conditions in the same group.

[0022] The specifications of the tested pneumatic diaphragm valves 6 in different diaphragm valve groups 5 are different. Since different diaphragm valve groups 5 adopt different specifications and the tested diaphragm valves 6 in each group do not affect each other, different specifications of pneumatic diaphragm valves 6 can be detected simultaneously on a pneumatic diaphragm valve life test device, further improving the detection efficiency.

[0023] Obviously, those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and its equivalent technologies, the present utility model also intends to include these changes and modifications.

Claims

1. A life test device for a pneumatic diaphragm valve, comprising a gas source (1) and a control valve (2) connected to the gas source (1), characterized in that: The control valve (2) is divided into two paths. One is the control air path (3), and the other is the test air path (4). The test air path (4) is used to connect at least one diaphragm valve group (5). The valve bodies of the measured pneumatic diaphragm valves (6) in the diaphragm valve group (5) are connected in series in sequence. The end of the valve body of the measured pneumatic diaphragm valve (6) at the last position is blocked by a plug (7). An electromagnetic valve (3-3) controlled by a PLC controller (3-4) is provided on the control air path (3). The air outlet of the electromagnetic valve (3-3) is used to connect the pneumatic switch air inlets of the measured pneumatic diaphragm valves (6) in the diaphragm valve group (5) respectively.

2. The pneumatic diaphragm valve life test device according to claim 1, characterized in that: A pressure regulating valve (3-2) is further provided on the control air path (3) in front of the electromagnetic valve (3-3).

3. The pneumatic diaphragm valve life test device according to claim 2, wherein: A barometer (3-1) is further provided on the control air path (3) in front of the pressure regulating valve (3-2).

4. The pneumatic diaphragm valve life test device according to claim 1, characterized in that: The test air path (4) is used to connect multiple diaphragm valve groups (5) in parallel.

5. The pneumatic diaphragm valve life test device according to claim 4, characterized in that: The measured pneumatic diaphragm valves (6) in the same diaphragm valve group (5) have the same specifications.

6. The pneumatic diaphragm valve life test device according to claim 4, wherein: The measured pneumatic diaphragm valves (6) in different diaphragm valve groups (5) have different specifications.

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