Pneumatic control valve

Abstract

The utility model discloses a pneumatic control valve which comprises a valve body provided with a valve port communicated with the interior of the valve body. The pneumatic piston is movably arranged at the valve port and is used for adjusting the opening degree of the valve port; the pneumatic piston is communicated with the pneumatic positioning instrument, the pneumatic positioning instrument drives the pneumatic piston to move, an electromagnetic valve is arranged on a pipeline, used for being communicated with an external air source, of the pneumatic positioning instrument, and the electromagnetic valve and the pneumatic positioning instrument are connected to the same power supply structure. When power is cut off, the electromagnetic valve closes the pipeline for communicating the external air source and the pneumatic positioning instrument, and the pneumatic piston stops acting after losing the power of the external air source, so that the valve port is kept in the original opening state, and the problem that water in the filter tank overflows due to closing of the valve port is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial automation control, and particularly relates to a pneumatic control valve. Background Art

[0002] Pneumatic control valves are widely used in the water conveyance work of waterworks. In the application of filter tanks in waterworks, the pneumatic positioner of the pneumatic control valve controls the gas inflow and outflow by receiving signals from the control system, and then drives the cylinder to drive the piston to act, thereby adjusting the opening of the valve port, so as to regulate the water level and flow rate of the filter tank connected to the valve port. However, the control system of the pneumatic control valve operates by electricity. When the power is off, driven by the continuous supply of external air source, the piston automatically closes the valve port connecting the filter tank, which will cause the water in the filter tank unable to drain through the valve port, and finally lead to the overflow of the water body in the filter tank. Summary of the Invention

[0003] The main purpose of the utility model is to provide a pneumatic control valve, aiming to solve the problem of water body overflow in the filter tank when the power is off.

[0004] To achieve the above purpose, the utility model provides a pneumatic control valve, including:

[0005] A valve body, the valve body is provided with a valve port for conducting the inside of the valve body;

[0006] A pneumatic piston, the pneumatic piston is movably arranged at the valve port for adjusting the opening of the valve port; and

[0007] A pneumatic positioner, the pneumatic piston is connected to the pneumatic positioner, the pneumatic positioner drives the pneumatic piston to move, and an electromagnetic valve is arranged on the pipeline for connecting the external air source of the pneumatic positioner, and the electromagnetic valve and the pneumatic positioner are connected to the same power supply structure.

[0008] Optionally, the pneumatic piston includes a cylinder, a connecting rod and a piston, one end of the connecting rod is movably inserted into the cylinder, the other end of the connecting rod is movably connected to the piston, and the piston is movably arranged in the valve port.

[0009] Optionally, the pneumatic positioner has a P communication port, an R communication port and an S communication port, the cylinder has an A communication port and a B communication port, the P communication port is communicated with the external air source, the R communication port is communicated with the A communication port, the S communication port is communicated with the B communication port, and the pneumatic positioner conveys gas to the cylinder through the R communication port and the S communication port.

[0010] Optionally, the electromagnetic valve is a two-position two-way electromagnetic valve.

[0011] Optionally, the pneumatic control valve further includes a controller, the pneumatic positioner and the solenoid valve are respectively connected to the controller, and the controller is used to remotely control the pneumatic positioner and the solenoid valve.

[0012] Optionally, the controller has an independent power supply structure.

[0013] In the technical solution of the present utility model, a solenoid valve is provided on the pipeline of the pneumatic positioner for connecting to an external air source, and the solenoid valve and the pneumatic positioner are connected to the same power supply structure. In this way, when the power is off, the solenoid valve closes the pipeline connecting the external air source and the pneumatic positioner, and the pneumatic piston loses the power of the external air source and stops operating. Thus, the valve port maintains the original opening state, thereby avoiding the problem of the water body in the filter tank overflowing due to the closing of the valve port. It can be understood that the technical solution of the present utility model solves the problem that the pneumatic piston automatically closes the valve port due to continuous external air supply when the power is off, and avoids the problem of the water body in the filter tank overflowing. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0015] Figure 1 It is a schematic structural diagram of the pneumatic control valve according to the first embodiment of the present utility model;

[0016] Figure 2 It is a schematic structural diagram of the pneumatic control valve according to the second embodiment of the present utility model;

[0017] Explanation of the reference numerals in the drawings:

[0018]

[0019]

[0020] The realization of the object, functional characteristics and advantages of the present utility model will be further described with reference to the embodiments and the drawings. Detailed Embodiments

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0022] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture (as shown in the attached drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0023] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0024] In view of this, the main object of the present utility model is to propose a pneumatic control valve, aiming to solve the problem that the pneumatic piston automatically closes the valve port due to continuous external air supply when power is off, and avoid the problem of water overflow in the filter tank.

[0025] As Figure 1 shown, the first embodiment of the present utility model provides a pneumatic control valve 100, including:

[0026] A valve body 110, the valve body 110 is provided with a valve port 110a that conducts the interior of the valve body;

[0027] A pneumatic piston 120, including: a cylinder 121, a connecting rod 122 and a piston 123. The cylinder 121 has an A communication port 121a and a B communication port 121b. One end of the connecting rod 122 is movably arranged in the cylinder 121, and the other end is connected to the piston 123. The piston 123 is movably arranged in the valve port 110a of the valve body 110 and can move up and down to control the opening degree of the pneumatic control valve 100.

[0028] A pneumatic positioner 130, having a P communication port 130a, an R communication port 130b and an S communication port 130c. The P communication port 130a is communicated with an external air source, the R communication port 130b is communicated with the A communication port 121a, and the S communication port 130c is communicated with the B communication port 121b. The pneumatic positioner 130 controls the movement of the pneumatic piston 120 by controlling the supply of gas to the R communication port 130b or the S communication port 130c, and adjusts the opening degree of the pneumatic control valve 100.

[0029] When power is cut off, the control system fails, and the pneumatic positioner 130 will misjudge the control signal. The pneumatic positioner 130 will close the S communication port 130c, open the R communication port 130b, and continuously supply gas to the R communication port 130b, thereby driving the pneumatic piston 120 to act in the direction of closing the pneumatic control valve, and finally closing the pneumatic control valve 100. This will cause the water in the filter tank to be unable to drain and accumulate in large quantities, eventually resulting in the overflow of the water body in the filter tank, causing equipment damage and endangering the safety of personnel.

[0030] In the utility model, a solenoid valve 140 is provided on the pipeline where the pneumatic positioner 130 is used to connect to the external air source. The solenoid valve 140 is a two-position two-way solenoid valve, and the solenoid valve 140 and the pneumatic positioner 130 are connected to the same power supply structure. Under normal circumstances, the two-position two-way solenoid valve is in the open state when powered on; when power is cut off, the two-position two-way solenoid valve will immediately close when de-energized, cutting off the air path, making the pneumatic piston 120 lose power, and the pneumatic control valve 100 maintains its original opening degree, solving the problem of automatic closing of the pneumatic control valve 100, and avoiding the risk of the water in the filter tank being unable to drain, accumulating in large quantities, and finally overflowing.

[0031] As Figure 2 shown, the structure of the pneumatic control valve 100 provided in the second embodiment of the utility model is the same as that of the first embodiment, and will not be described in detail. Preferably, the solenoid valve 140 is a solenoid valve with an independent power supply wireless controller. When power is cut off, the solenoid valve 140 switches to an independent power supply and automatically or wirelessly controls to cut off the air source air path, making the pneumatic piston 120 lose power, and the pneumatic control valve 100 maintains its original opening degree, solving the problem of automatic closing of the pneumatic control valve 100, and avoiding the risk of the water in the filter tank being unable to drain, accumulating in large quantities, and finally overflowing.

[0032] The above are only the preferred embodiments of the utility model, and do not limit the patent scope of the utility model accordingly. Any equivalent structural transformation made by using the specification and drawings of the utility model under the inventive concept of the utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the utility model.

Claims

1. A pneumatic regulating valve, characterized in that: include: A valve body, wherein the valve body is provided with a valve port communicating with the interior of the valve body; A pneumatic piston, the pneumatic piston is movably disposed at the valve port and is used to adjust the opening of the valve port; as well as A pneumatic positioner, the pneumatic piston is connected to the pneumatic positioner, the pneumatic positioner drives the pneumatic piston to move, a solenoid valve is arranged on the pipeline of the pneumatic positioner for connecting to an external air source, and the solenoid valve and the pneumatic positioner are connected to the same power supply structure.

2. The pneumatic control valve according to claim 1, characterized in that: The pneumatic piston comprises a cylinder, a connecting rod and a piston. One end of the connecting rod is movably inserted into the cylinder, and the other end of the connecting rod is connected to the piston. The piston is movably arranged at the valve port.

3. The pneumatic control valve according to claim 2, characterized in that: The pneumatic positioner has a P connecting port, an R connecting port and an S connecting port, the cylinder has an A connecting port and a B connecting port, the connecting rod is movably arranged between the A connecting port and the B connecting port, the P connecting port is connected to an external air source, the R connecting port is connected to the A connecting port, and the S connecting port is connected to the B connecting port, and the pneumatic positioner delivers gas to the cylinder through the R connecting port and the S connecting port.

4. The pneumatic control valve according to any one of claims 1 to 3, characterized in that: The solenoid valve is a two-position two-way solenoid valve.

5. The pneumatic control valve according to any one of claims 1 to 3, characterized in that: The pneumatic regulating valve further comprises a controller, the pneumatic positioner and the solenoid valve are respectively connected to the controller, and the controller is used for remotely controlling the pneumatic positioner and the solenoid valve.

6. The pneumatic control valve according to claim 5, characterized in that: The controller has an independent power supply structure.

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