Adjusting type pneumatic executing mechanism with three-break position keeping function

Abstract

The utility model belongs to the technical field of pneumatic actuating mechanisms, and particularly relates to an adjusting type pneumatic actuating mechanism with a three-break position keeping function. The utility model comprises a pneumatic actuating mechanism; an air outlet of the position retaining valve is communicated with an air inlet of the pneumatic actuating mechanism; an air outlet of the electromagnetic valve is communicated with a control port of the position retaining valve; an air outlet of the positioner is communicated with an air inlet of the position retaining valve; an air inlet of the filtering pressure reducing valve is communicated with an external air source, and an air outlet of the filtering pressure reducing valve is connected with an air inlet of the positioner and an air inlet of the electromagnetic valve in parallel; electric signals of the positioner control a power supply of the electromagnetic valve. The utility model is used for solving the technical problems that the existing three-break position-keeping pneumatic actuating mechanism is either complex in structure and more in fault points or not simple in structure, but the used piezoelectric valve cannot work in a low-temperature environment.

Description

Technical Field

[0001] The utility model belongs to the technical field of pneumatic actuators, and particularly relates to a regulating pneumatic actuator with a three-break position holding function. Background Art

[0002] Pneumatic actuators usually require a three-break position holding (power-off, air-off, signal-off) function, that is, in the case of three breaks, the opening of the pneumatic actuator is not affected and maintains its original state.

[0003] In response to this requirement, most of the existing pneumatic actuators in the prior art achieve it by setting complex mechanical structures on the pneumatic actuator. However, the more complex the mechanical structure, the more failure points it is likely to bring. A few use piezoelectric valves to achieve it, but due to the structural problems of the piezoelectric valves (the ceramic chips inside are difficult to deform in low-temperature environments), they cannot operate under working conditions below -20°C. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a regulating pneumatic actuator with a three-break position holding function, which is used to solve the technical problems that the existing three-break position holding pneumatic actuators are either complex in structure and have many failure points, or cannot be simple in structure, but the piezoelectric valves used cannot work in low-temperature environments.

[0005] The technical solution for the utility model to solve the above technical problems is as follows: A regulating pneumatic actuator with a three-break position holding function, comprising:

[0006] A pneumatic actuator;

[0007] A position holding valve, the air outlet of the position holding valve is communicated with the air inlet of the pneumatic actuator;

[0008] An electromagnetic valve, the air outlet of the electromagnetic valve is communicated with the control port of the position holding valve;

[0009] A positioner, the air outlet of the positioner is communicated with the air inlet of the position holding valve;

[0010] A filter pressure reducing valve, the air inlet of the filter pressure reducing valve is communicated with an external air source, and the air outlet of the filter pressure reducing valve is in parallel with the air inlets of the positioner and the electromagnetic valve;

[0011] The electrical signal of the positioner controls the power supply of the electromagnetic valve.

[0012] The utility model has a simple structure, combines the pneumatic control part and the electric control part to complete the three-break position holding function, and can work normally in a low-temperature environment.

[0013] Further: The positioner is an electro-pneumatic valve positioner.

[0014] Beneficial effects of this step: By inputting an electrical signal of 4 - 20 mADC to control the opening degree of the positioner, different air pressures can be adjusted.

[0015] Further: The positioner is electrically connected to the receiving component of the opto - coupler, the output component of the opto - coupler is electrically connected to the relay, and the relay is electrically connected to the solenoid valve.

[0016] Beneficial effects of this step: The opto - coupler is used to detect whether the electrical signal input to the positioner exists. When the electrical signal exists, the output component of the opto - coupler conducts, enabling the relay to complete the suction, and the solenoid valve is powered on to work; otherwise, the solenoid valve does not work.

[0017] Further: The electrical signal used to control the positioner is connected to the positioner through a surge protector.

[0018] Beneficial effects of this step: The surge protector plays a role in protecting the positioner.

[0019] Further: The solenoid valve is a globe valve.

[0020] Beneficial effects of this step: The globe valve only has a switching function, with a simple structure, fast response speed, can transmit to the control port of the holding valve in time, can reduce the impact of three - break on the pneumatic actuator, and enable the pneumatic actuator to maintain its original position in the case of three - break.

[0021] The beneficial effects of the present utility model are:

[0022] 1. The structure of this application is simple. By using the combination of the solenoid valve and the holding valve, the holding function in the case of air cut - off and power cut - off can be directly completed. The opto - coupler is used to detect the electrical signal of the positioner and then feedback it to the solenoid valve, indirectly completing the holding function in the case of signal cut - off.

[0023] 2. Since this application does not use components such as piezoelectric valves, the entire holding component (solenoid valve, holding valve, positioner, opto - coupler, etc.) can work normally in a low - temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1Schematic diagram of the pneumatic control part connection of a regulating pneumatic actuator with a triple-break and position-holding function provided by the present utility model;

[0026] Figure 2 Schematic diagram of the electric control part connection of a regulating pneumatic actuator with a triple-break and position-holding function provided by the present utility model Figure 1 ;

[0027] Figure 3 Schematic diagram of the electric control part connection of a regulating pneumatic actuator with a triple-break and position-holding function provided by the present utility model Figure 2 .

[0028] Reference numerals:

[0029] 1 - Pneumatic actuator; 2 - Position-holding valve; 3 - Positioner; 4 - Solenoid valve; 5 - Filter pressure reducing valve; 6 - Optocoupler; 7 - Relay; 8 - Surge protector. Specific embodiments

[0030] The embodiments of the technical solution of the present utility model will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present utility model, so they are only examples and cannot be used to limit the protection scope of the present utility model.

[0031] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art to which the present utility model belongs.

[0032] In the description of this application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model.

[0033] In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the present utility model, "a plurality" means more than two unless otherwise specifically defined.

[0034] In this application, unless otherwise clearly specified or limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0035] In this application, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0036] Embodiment

[0037] As Figure 1 shown, an adjustable pneumatic actuator with a three - break and position - holding function provided by this utility model includes:

[0038] A pneumatic actuator 1;

[0039] A position - holding valve 2, the air outlet of the position - holding valve 2 is communicated with the air inlet of the pneumatic actuator 1, and the position - holding valve 2 is used to keep the pneumatic actuator 1 in place;

[0040] A solenoid valve 4, the air outlet of the solenoid valve 4 is communicated with the control port of the position - holding valve 2, and the solenoid valve 4 controls the on - off of the air path connecting to the control port of the position - holding valve 2;

[0041] A positioner 3, the air outlet of the positioner 3 is communicated with the air inlet of the position - holding valve 2, and the positioner 3 can adjust the opening degree of the pneumatic actuator 1;

[0042] A filter pressure - reducing valve 5, the air inlet of the filter pressure - reducing valve 5 is communicated with an external air source, the air outlet of the filter pressure - reducing valve 5 is in parallel with the air inlet of the positioner 3 and the air inlet of the solenoid valve 4, and the filter pressure - reducing valve 5 filters the external air source and reduces the pressure of the external air source;

[0043] The electrical signal of the positioner 3 controls the power supply of the solenoid valve 4.

[0044] The working principle of this application is briefly described as follows:

[0045] 1. Normal working state: The 4 - 20 mA control signal is maintained. The control unit provides power to the solenoid valve 4. The solenoid valve 4 is energized, the gas path is opened, the control port of the retaining valve 2 is pressurized, the retaining valve 2 is turned on, and the pneumatic actuator 1 is controlled by the positioner 3.

[0046] 2. Loss of air supply: The solenoid valve 4 has no output pressure. The control port of the retaining valve 2 loses pressure. The retaining valve 2 is turned off, and the pneumatic actuator 1 remains in its original state.

[0047] 3. Power failure: The solenoid valve 4 is closed and has no output pressure. The control port of the retaining valve 2 loses pressure. The retaining valve 2 is turned off, and the pneumatic actuator 1 remains in its original state.

[0048] 4. Loss of signal: The control part cannot detect the electrical signal of the positioner 3. The control part disconnects the power supply to the solenoid valve 4. The solenoid valve 4 loses power, the gas path is disconnected, the control port of the retaining valve 2 loses pressure, the retaining valve 2 is turned off, and the pneumatic actuator 1 remains in its original state.

[0049] The utility model has a simple structure, combines the pneumatic control part and the electric control part to complete the three - break retaining function, and can work normally in a low - temperature environment.

[0050] On the basis of the above - mentioned technical solution, the positioner 3 is an electro - pneumatic valve positioner.

[0051] By inputting an electrical signal of 4 - 20 mADC to control the opening degree of the positioner 3, different air pressures can be adjusted.

[0052] As Figure 2 and Figure 3 shown, the positioner 3 is electrically connected to the receiving component of the opto - coupler 6. The output component of the opto - coupler 6 is electrically connected to the relay 7. The relay 7 is electrically connected to the solenoid valve 4.

[0053] The opto - coupler 6 is used to detect whether the electrical signal input to the positioner 3 exists. When the electrical signal exists, the output component of the opto - coupler 6 is turned on, enabling the relay 7 to be energized and the solenoid valve 4 to be powered on for operation; otherwise, the solenoid valve 4 does not work.

[0054] On the basis of the above - mentioned technical solution, the electrical signal for controlling the positioner 3 is connected to the positioner 3 through a surge protector 8.

[0055] The surge protector 8 plays a role in protecting the positioner 3 and the opto - coupler 7.

[0056] On the basis of the above - mentioned technical solution, the solenoid valve 4 is a globe valve.

[0057] The globe valve only has the function of opening and closing, with a simple structure and fast response speed. It can transmit the signal to the control port of the holding valve 2 in time, reduce the influence of the three interruptions on the pneumatic actuator 1, and keep the pneumatic actuator 1 in place under the condition of the three interruptions.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A regulating pneumatic actuator with three-break position-keeping function, characterized in that: include: Pneumatic actuators; A retaining valve, wherein the air outlet of the retaining valve is connected to the air inlet of the pneumatic actuator; A solenoid valve, wherein the air outlet of the solenoid valve is connected to the control port of the position-holding valve; A positioner, wherein the air outlet of the positioner is connected to the air inlet of the position-keeping valve; A filter pressure reducing valve, wherein the air inlet of the filter pressure reducing valve is connected to an external air source, and the air outlet of the filter pressure reducing valve is connected in parallel with the air inlet of the positioner and the air inlet of the solenoid valve; The electrical signal of the positioner controls the power supply of the solenoid valve.

2. The regulating pneumatic actuator with three-break position-keeping function according to claim 1 is characterized in that: The positioner is an electro-pneumatic valve positioner.

3. The adjustable pneumatic actuator with three-break position-keeping function according to claim 2 is characterized in that: The positioner is electrically connected to a receiving component of a photoelectric coupler, an output component of the photoelectric coupler is electrically connected to a relay, and the relay is electrically connected to the solenoid valve.

4. The adjustable pneumatic actuator with three-break position-keeping function according to claim 3 is characterized in that: The electrical signal for controlling the positioner is connected to the positioner through a surge protector.

5. The adjustable pneumatic actuator with three-break position-keeping function according to claim 1, characterized in that: The solenoid valve is a stop valve.

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