CN217653341U - Control loop of pneumatic actuator and pneumatic actuator - Google Patents
Control loop of pneumatic actuator and pneumatic actuator Download PDFInfo
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- CN217653341U CN217653341U CN202220228431.3U CN202220228431U CN217653341U CN 217653341 U CN217653341 U CN 217653341U CN 202220228431 U CN202220228431 U CN 202220228431U CN 217653341 U CN217653341 U CN 217653341U
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Abstract
The utility model relates to a pneumatic actuator's control circuit and pneumatic actuator, this pneumatic actuator's control circuit includes: the relay valve is connected with the pneumatic actuating mechanism; the manual reversing valve is connected with the relay valve to control gas to flow through the relay valve so as to enable the pneumatic actuating mechanism to stretch and retract; the valve positioner is connected with the relay valve to control gas to flow through the relay valve so as to enable the pneumatic actuating mechanism to stretch and retract; and the air inlet end of the loop switching valve is externally connected with an air source, and the air outlet end of the loop switching valve is respectively connected with the manual reversing valve and the valve positioner so as to control air to flow through the manual reversing valve or the valve positioner. The utility model discloses can realize the switching of manual control and automatic control dual mode, be convenient for implement the maintenance operation to pneumatic actuator and the work of resetting when unusual in industrial production.
Description
Technical Field
The utility model relates to a pneumatic actuator's control circuit and pneumatic actuator.
Background
The valve positioner is used with the pneumatic control valve in a matched mode, the static characteristic of the pneumatic control valve can be improved, the linearity of the valve position is improved, the dynamic characteristic of the pneumatic control valve is improved, the transmission delay of a regulating signal is reduced, the flow characteristic of the pneumatic control valve and the response range of the signal pressure can be changed through the valve positioner, and valve split-range control and action regulation are achieved. In the case of valve positioners, to avoid failure, pneumatic actuators are typically required to be held in position when the power supply is cut off.
SUMMERY OF THE UTILITY MODEL
The inventor of the application finds that the existing loop adopting the valve positioner to control the pneumatic actuating mechanism can keep the position of the pneumatic actuating mechanism when the air supply and the power are cut off, but when the valve positioner breaks down, the reset work of the pneumatic actuating mechanism cannot be realized, and the maintenance operation of the pneumatic actuating mechanism in industrial production is not convenient. In view of the above problems, it is necessary to provide a control circuit of a pneumatic actuator and a pneumatic actuator to solve or partially solve the above problems, and the present invention provides the following technical solutions:
as the utility model discloses a first aspect of the embodiment, the embodiment of the utility model provides a pneumatic actuator's control circuit is provided, include:
the relay valve is connected with the pneumatic actuating mechanism;
the manual reversing valve is connected with the relay valve to control gas to flow through the relay valve so as to enable the pneumatic actuating mechanism to stretch and retract;
the valve positioner is connected with the relay valve to control gas to flow through the relay valve so as to enable the pneumatic actuating mechanism to stretch;
and the air inlet end of the loop switching valve is externally connected with an air source, and the air outlet end of the loop switching valve is respectively connected with the manual reversing valve and the valve positioner so as to control air to flow through the manual reversing valve or the valve positioner.
In one or some optional embodiments, the control circuit of the pneumatic actuator further comprises: a latch valve connected between the relay valve and the pneumatic actuator;
the latch valve is configured to cut off a gas passage with the pneumatic actuator to hold the pneumatic actuator in position if a valve signal pressure is lower than a preset pressure.
In one or some alternative embodiments, the control circuit of the pneumatic actuator further comprises a solenoid valve;
the air inlet end of the electromagnetic valve is connected with the air source, and the air outlet end of the electromagnetic valve is connected with the locking valve.
In one or some alternative embodiments, the solenoid valve is configured to shut off the gas passage to the latch valve if power is lost, such that the signal pressure of the latch valve is below a preset pressure.
The control circuit of the pneumatic actuator further comprises: an air source regulating valve;
the air source regulating valve is connected between an air source and the loop switching valve so as to control the pressure of the air source to be a preset pressure value;
and the air inlet end of the electromagnetic valve is connected between the air outlet end of the air source regulating valve and the air inlet end of the loop switching valve.
In one or some alternative embodiments, the solenoid valve is a two-position, three-way solenoid valve.
In one or some alternative embodiments, the air supply regulating valve is a filter pressure relief valve.
In one or some alternative embodiments, the relay valve includes a first shuttle valve and a second shuttle valve;
the first air inlet of the first shuttle valve and the first air inlet of the second shuttle valve are respectively connected with the manual reversing valve;
the second air inlet of the first shuttle valve and the second air inlet of the second shuttle valve are respectively connected with the valve positioner;
and the air outlet of the first shuttle valve and the air outlet of the second shuttle valve are respectively connected with the locking valve.
In one or some alternative embodiments, the manual directional valve and the circuit switching valve are two-position four-way mechanical control valves.
In one or some alternative embodiments, the control circuit of the pneumatic actuator further comprises a silencer, and the silencer is connected to the exhaust port of the manual reversing valve, the circuit switching valve and/or the electromagnetic valve.
As a second aspect of the embodiments of the present invention, an embodiment of the present invention provides a pneumatic actuator, including: a pneumatic actuator and a control circuit for the pneumatic actuator.
The embodiment of the utility model provides a following technological effect has been realized at least:
the control circuit of the pneumatic actuator provided by the embodiment is respectively connected with the pneumatic actuator through the manual reversing valve and the valve positioner to form a manual control circuit comprising the manual reversing valve and an automatic control circuit comprising the valve positioner, and the action of the pneumatic actuator can be controlled in a manual control mode and an automatic control mode through the two control circuits; and the manual reversing valve and the valve positioner are respectively connected with the loop switching valve, the switching between a manual control mode and an automatic control mode is realized through different actions of the loop switching valve, the maintenance operation and the resetting work in abnormal conditions of the pneumatic actuating mechanism in industrial production are facilitated, and the pneumatic actuating mechanism can be manually operated to rapidly extend or retract during maintenance.
In the control circuit of the pneumatic actuating mechanism provided by the embodiment, the electromagnetic valve is additionally arranged on the driving gas path of the locking valve, when the gas source of the system is in fault or in the gas-off condition, the signal pressure of the locking valve is lower than the preset pressure, the locking valve is closed, the gas path is cut off, and the pneumatic actuating mechanism keeps the position before the gas-off, so that the gas-off and position-protection are realized; under the condition of system power failure, the electromagnetic valve is powered off to cut off the air source of the driving air path, so that the signal pressure of the locking valve is lower than the preset pressure, the locking valve is closed, the air path is cut off, and the pneumatic actuating mechanism keeps the position before power failure, so that power failure and position maintenance are realized. The electromagnetic valve is additionally arranged on the driving gas path of the locking valve, so that the requirement of the working condition with strict requirement on the valve action time is met, and the emergency action under the conditions of power failure, gas failure and the like can be realized.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts. Elements having the same reference number designation in the drawings are denoted as similar elements, and the drawings are not to be limited to the scale shown unless specifically noted.
Fig. 1 is a schematic diagram of a control circuit of a pneumatic actuator according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pneumatic actuator according to an embodiment of the present invention.
Wherein:
the pneumatic control valve comprises a gas source regulating valve 1, a loop switching valve 2, a manual reversing valve 3, a valve positioner 4, a first shuttle valve 5, a second shuttle valve 6, a pneumatic actuating mechanism 7, a locking valve 8, an electromagnetic valve 9 and a silencer 10.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, an embodiment of the present invention provides a control circuit of a pneumatic actuator, including:
a relay valve connected to the pneumatic actuator 7;
the manual reversing valve 3 is connected with the relay valve so as to control gas to flow through the relay valve and enable the pneumatic actuating mechanism 7 to stretch and retract;
the valve positioner 4 is connected with the relay valve to control gas to flow through the relay valve so as to enable the pneumatic actuator 7 to extend and retract;
and the air inlet end of the loop switching valve 2 is externally connected with an air source, and the air outlet end of the loop switching valve is respectively connected with the manual reversing valve 3 and the valve positioner 4 so as to control the air to flow through the manual reversing valve 3 or the valve positioner 4.
In this embodiment, the telescopic action of the pneumatic actuator 7 is driven and executed by an air source, and is a double-acting pneumatic actuator. The switching between the manual control loop and the automatic control loop is realized through the loop switching valve 2.
Specifically, the position of the valve of the circuit switching valve 2 is adjusted to switch a manual control circuit and an automatic control circuit, wherein the manual control circuit is a circuit controlled by the manual reversing valve 3, and the automatic control circuit is a circuit controlled by the valve positioner 4. When the valve positioner 4 fails, the pneumatic actuator 7 can be rapidly extended or rapidly retracted by manual operation.
In this embodiment, as shown with reference to fig. 1, the relay valve may include a first shuttle valve 5 and a second shuttle valve 6. The valve positioner 4 is an electric valve positioner, which receives the gas output by the loop switching valve 2 and the signal sent by the controller, then controls the actions of the first shuttle valve 5 and the second shuttle valve 6 according to the output signal, controls the extension or retraction of the pneumatic actuator 7 after the first shuttle valve 5 and/or the second shuttle valve 6 act, and feeds back the displacement of the valve rod to the valve positioner 4 through a mechanical device.
The electric valve positioner takes a valve rod displacement signal as an input feedback measurement signal, takes a command signal sent by the controller as a setting signal, compares the two signals, and changes an output signal from the electric valve positioner to the pneumatic actuator 7 through the first shuttle valve 5 or the second shuttle valve 6 when the two signals have deviation, so that the pneumatic actuator 7 acts, and the one-to-one correspondence relationship between the valve rod displacement and the controller output signal is established. Therefore, the valve positioner 4 constitutes a feedback control system that takes the valve stem displacement as a measurement signal and the controller output as a setting signal. The electric valve positioner increases the output power of the pneumatic actuator 7 through the first shuttle valve 5 and the second shuttle valve 6, reduces the occurrence of the condition of transmission lag of an adjusting signal, accelerates the moving speed of a valve rod, can improve the linearity of a valve, overcomes the friction force of the valve rod, eliminates the influence of unbalanced force, ensures the correct positioning of the first shuttle valve 5 and the second shuttle valve 6, and controls the accurate action of the pneumatic actuator 7.
As a specific example, the valve positioner 4 may be an SMC I P8000 series explosion proof electric valve positioner. Of course, in the embodiment of the present invention, this model valve positioner is only the present invention is an example, the embodiment of the present invention describes the specific structure and implementation manner of the valve positioner 4, and those skilled in the art can refer to the detailed description in the prior art, and therefore, in the embodiment of the present invention, specific limitation may not be made.
In one or some optional embodiments, the control circuit of the pneumatic actuator further comprises: a latch valve 8, wherein the latch valve 8 is connected between the relay valve and the pneumatic actuator 7;
the latch valve 8 is configured to cut off a gas passage with the pneumatic actuator 7 if the valve signal pressure is lower than a preset pressure, so that the pneumatic actuator 7 maintains a position. The locking valve 8 is a position-keeping valve, when the valve signal pressure is lower than the preset pressure, the pressure is detected in time, and the channel of the pneumatic actuating mechanism 7 can be cut off automatically. When the air supply is stopped due to the failure of the air source, the control channel of the pneumatic actuator 7 is cut off by the locking valve 8, so that the position of the pneumatic actuator 7 is kept at the position before air cut-off. The normal operation of the technological process is ensured, until the accident in the system is eliminated, the channel is not opened by the locking valve 8 after the gas supply is carried out again, and the normal control is carried out.
In one or some alternative embodiments, the control circuit of the pneumatic actuator further comprises a solenoid valve 9;
the air inlet end of the electromagnetic valve 9 is connected with the air source, and the air outlet end of the electromagnetic valve 9 is connected with the locking valve 8;
the solenoid valve 9 is configured to cut off a gas passage with the latch valve 8 if power is lost, so that the signal pressure of the latch valve 8 is lower than a preset pressure.
When power failure or power off, the electromagnetic valve 9 loses power, and the gas channel of the locking valve 8 is cut off, so that the signal pressure of the locking valve 8 is lower than the set pressure, the internal gas channel of the locking valve 8 is cut off, the gas channel of the locking valve 8 and the gas channel of the pneumatic actuating mechanism 7 are cut off, and the pneumatic actuating mechanism 7 keeps a position to play a role in power off and position protection.
In one or some alternative embodiments, the solenoid valve 9 is a two-position three-way solenoid valve.
As a specific embodiment, the electromagnetic valve 9 of the present invention is a normally closed two-position three-way electromagnetic valve. Referring to fig. 1, when the coil of the electromagnetic valve 9 is energized, the second interface is communicated with the first interface, the third interface is closed, and the gas path is communicated; when the electromagnetic valve coil is powered off, the first interface is closed, the second interface is communicated with the third interface, and the air path is disconnected.
As a specific example, the solenoid valve 9 employs an SMC VT317 series solenoid valve. Certainly, in the embodiment of the present invention, this model solenoid valve is only an example of the present invention, and the embodiment of the present invention describes the specific structure and the implementation manner of the solenoid valve 9, and those skilled in the art can refer to the detailed description in the prior art, and therefore, in the embodiment of the present invention, no specific limitation can be made.
In this embodiment, the electromagnetic valve 9 is additionally installed on the driving air path of the lock valve 8, so that the action control of the pneumatic actuator 7 by an electric signal is realized. The action of the locking valve 8 is controlled by controlling the on-off of the electromagnetic valve 9 through an electric signal, and the quick action of the pneumatic actuating mechanism 7 can be realized.
When the power supply fails or is disconnected, the electromagnetic valve 9 is powered off, gas at the electromagnetic valve 9 is exhausted through an exhaust port of the electromagnetic valve 9, at the moment, the signal pressure of the locking valve 8 is lower than the set pressure, the internal gas path of the locking valve 8 is cut off, so that the gas channel between the locking valve 8 and the pneumatic actuating mechanism 7 is cut off, and the cylinder keeps a position to play a role in power-off and position protection.
When the air source is in fault or under the condition of air cut-off, the signal pressure of the locking valve 8 is lower than the set pressure, the internal air path of the locking valve 8 is cut off, so that the air channels of the locking valve 8 and the pneumatic actuating mechanism 7 are cut off, the cylinder keeps a position, and the functions of air cut-off and position protection are achieved. The requirement that there is the harsh operating mode to valve action time has been satisfied through solenoid valve 9 and lock valve 8 to this embodiment, can realize the emergency action under the circumstances such as outage, gas break.
The control circuit of the pneumatic actuator further comprises: an air source regulating valve 1;
the air source regulating valve 1 is connected between an air source and the loop switching valve 2 so as to control the pressure of the air source to be a preset pressure value;
and the air inlet end of the electromagnetic valve 9 is connected between the air outlet end of the air source regulating valve 1 and the air inlet end of the loop switching valve 2. Air from an air source is regulated by the air source regulating valve 1 to output preset pressure, and flows to the electromagnetic valve 9 and the loop switching valve 2 respectively.
In one or some alternative embodiments, the air supply regulating valve 1 is a filter pressure reducing valve. The filter relief valve is capable of reducing the inlet pressure from the air supply to a desired outlet pressure and ensures that the outlet pressure remains constant.
As a specific embodiment, the air source regulating valve 1 adopts an SMC filtering pressure reducing valve with a reverse flow function, and the model is AW20K-B to AW60K-B. Of course, in the embodiment of the utility model provides an in, this model filters relief pressure valve only does the utility model discloses air supply governing valve 1's an example, the embodiment of the utility model discloses the concrete structure and the implementation of air supply governing valve 1 that describe, the skilled person can refer to the detailed description among the prior art, and to this, in the embodiment of the utility model, can not do specifically and prescribe a limit to.
In one or some alternative embodiments, the first inlet port of the first shuttle valve 5 and the first inlet port of the second shuttle valve 6 are respectively connected with the manual directional valve 3;
the second air inlet of the first shuttle valve 5 and the second air inlet of the second shuttle valve 6 are respectively connected with the valve positioner 4;
the air outlet of the first shuttle valve 5 and the air outlet of the second shuttle valve 6 are respectively connected with the locking valve 8.
Of course, in the embodiment of the present invention, the first shuttle valve 5 and the second shuttle valve 6 are only examples of the relay valve of the present invention, and the detailed structure and implementation manner of the relay valve described in the embodiment of the present invention can be referred to by those skilled in the art, and therefore, in the embodiment of the present invention, specific limitations may not be made.
Referring to fig. 1, in the present embodiment, the first shuttle valve 5 and the second shuttle valve 6 each have two inlets and one outlet, respectively, a first inlet and a second inlet, wherein both the first inlet and the second inlet may communicate with the outlet, but the first inlet and the second inlet do not communicate. Either the first inlet port or the second inlet port has a signal input and the outlet port has an output. If the first air inlet and the second air inlet have signal input, the air signal of the adding side or the high-signal-pressure side is output through the air outlet, the other side is blocked, and the air outlet does not output the signal only when the first air inlet and the second air inlet do not input the signal. The present embodiment uses the first and second shuttle valves 5 and 6 as relay valves to be applied to parallel circuits of manual and automatic control, i.e., a circuit of a manual directional valve and a circuit of a valve positioner, and control signals can be sequentially input to the control pneumatic actuator 7.
As a specific example, the first and second shuttle valves 5 and 6 are SMC pneumatic shuttle valves, VR12 series, with a logic function of OR, connecting separate signal sources to a common pilot control line. Of course, in the embodiment of the present invention, this model shuttle valve is only an example of the present invention, and the embodiment of the present invention describes the specific structure and implementation manner of the first shuttle valve 5 and the second shuttle valve 6, and those skilled in the art can refer to the detailed description in the prior art, and therefore, in the embodiment of the present invention, the present invention may not be specifically limited.
In one or some alternative embodiments, the manual reversing valve 3 and the loop switching valve 2 are two-position four-way mechanical control valves.
As a specific example, the manual reversing valve 3 and the circuit switching valve 2 adopt SMC manual control valve, VH series. Certainly, in the embodiment of the present invention, this model hand-operated direction valve 3 with the return circuit diverter valve 2 is only an example of the present invention, the embodiment of the present invention describes hand-operated direction valve 3 with the concrete structure and the implementation of return circuit diverter valve 2, and the skilled person in the art can refer to the detailed description in the prior art, and to this, in the embodiment of the present invention, it is not specifically limited.
In one or some optional embodiments, the control circuit of the pneumatic actuator further comprises a silencer 10, and the silencer 10 is connected to the exhaust port of the manual directional valve 3, the circuit switching valve 2 and/or the electromagnetic valve 9.
Because the gas valve has high exhaust speed when working, the gas volume expands rapidly, and the harsh noise is generated, the high-pressure gas in the exhaust port can expand relatively slowly before being sprayed out of the exhaust port through the silencer 10, the speed and the power of spraying the gas are reduced, and the noise is reduced.
As a specific example, the muffler 10 is a muffler manufactured by SMC corporation, such as AN series muffler.
Of course, in the embodiment of the present invention, this model muffler is only an example of the present invention, and the embodiment of the present invention describes the concrete structure and the implementation manner of the muffler 10, and those skilled in the art can refer to the detailed description in the prior art, and therefore, in the embodiment of the present invention, the present invention may not be specifically limited.
For more clear explanation of the control circuit of the pneumatic actuator provided in the embodiments of the present invention, the following is a detailed explanation of the air circuit control principle of the control circuit of the pneumatic actuator:
under the condition that air inlet of the air source and the electromagnetic valve 9 are electrified:
(1) when the handle of the loop switching valve 2 is at the fourth interface position, the cylinder is controlled by the valve positioner 4:
and a gas source flows through the gas source regulating valve 1 to the valve positioner 4, flows through the first shuttle valve 5 and the lock valve 8, enters the cylinder of the pneumatic actuating mechanism 7, the piston rod of the cylinder extends out, and the gas from the cylinder flows through the lock valve 8 and the second shuttle valve 6 to the valve positioner 4 and is finally discharged from the gas outlet of the loop switching valve 2.
And a gas source flows through the gas source regulating valve 1 to the valve positioner 4, flows through the second shuttle valve 6 and the locking valve 8 to enter the cylinder of the pneumatic actuating mechanism 7, the piston rod of the cylinder retracts, and the gas coming out of the cylinder flows through the locking valve 8 and the first shuttle valve 5 to the valve positioner 4 and is finally discharged from the gas outlet of the loop switching valve 2.
(2) When the handle of the loop switching valve 2 is at the second interface position, the cylinder is controlled by the manual reversing valve 3:
and (3) rotating a handle of the manual reversing valve 3 to a fourth interface position, enabling an air source to pass through the air source regulating valve 1 to the manual reversing valve 3, and enter a first air port of an air cylinder of the pneumatic actuating mechanism 7 through the first shuttle valve 5 and the locking valve 8, namely an extending (EXTEND) air port of a piston rod, enabling the piston rod of the air cylinder to EXTEND rapidly, enabling air coming out of the air cylinder to pass through the locking valve 8 and the second shuttle valve 6 to the manual reversing valve 3, and finally discharging the air from an air outlet of the manual reversing valve 3.
And the handle of the manual reversing valve 3 is screwed to the position of a second interface, an air source enters a second air port of the air cylinder of the pneumatic actuating mechanism 7 through the air source regulating valve 1 to the manual reversing valve 3 and a second shuttle valve 6 and a locking valve 8, namely a piston rod retraction (RETRACT) air port, the piston rod of the air cylinder RETRACTs rapidly, and the air coming out of the air cylinder is discharged from the air outlet of the manual reversing valve 3 through the locking valve 8 and the first shuttle valve 5.
Based on same utility model conceive, it is shown with reference to fig. 2, the embodiment of the utility model provides a pneumatic executive device is still provided, include: a pneumatic actuator and a control circuit for said pneumatic actuator.
The embodiment of the utility model provides a pneumatic actuator's that provides control circuit's concrete implementation can refer to the detailed description to pneumatic actuator's control circuit in above-mentioned embodiment, of course, in the realization process, the skilled in the art also can refer to the detailed description among the prior art, and the repetition part is no longer repeated.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The terms "upper", "lower", and the like refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention is not limited to any single aspect, nor is it limited to any single embodiment, nor is it limited to any combination and/or permutation of these aspects and/or embodiments. Each aspect and/or embodiment of the present invention may be used alone or in combination with one or more other aspects and/or embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and these modifications or substitutions do not depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A control circuit for a pneumatic actuator, comprising:
the relay valve is connected with the pneumatic actuating mechanism;
the manual reversing valve is connected with the relay valve to control gas to flow through the relay valve so as to enable the pneumatic actuating mechanism to stretch and retract;
the valve positioner is connected with the relay valve to control gas to flow through the relay valve so as to enable the pneumatic actuating mechanism to stretch;
and the air inlet end of the loop switching valve is externally connected with an air source, and the air outlet end of the loop switching valve is respectively connected with the manual reversing valve and the valve positioner so as to control air to flow through the manual reversing valve or the valve positioner.
2. The control circuit of a pneumatic actuator of claim 1, further comprising: a latch valve connected between the relay valve and the pneumatic actuator;
the latch valve is configured to cut off a gas passage with the pneumatic actuator to hold the pneumatic actuator in position if a valve signal pressure is lower than a preset pressure.
3. The control circuit of a pneumatic actuator of claim 2, further comprising: the air inlet end of the electromagnetic valve is connected with the air source, and the air outlet end of the electromagnetic valve is connected with the locking valve;
the solenoid valve is configured to cut off a gas passage to the latch valve if power is lost, so that a signal pressure of the latch valve is lower than a preset pressure.
4. The pneumatic actuator control circuit of claim 3, wherein the solenoid valve is a two-position, three-way solenoid valve.
5. The control circuit of a pneumatic actuator of claim 3, further comprising: an air source regulating valve;
the gas source regulating valve is connected between a gas source and the loop switching valve so as to control the pressure of the gas source to be a preset pressure value;
and the air inlet end of the electromagnetic valve is connected between the air outlet end of the air source regulating valve and the air inlet end of the loop switching valve.
6. The control circuit of a pneumatic actuator according to claim 5, wherein the air supply regulating valve is a filter pressure reducing valve.
7. The control circuit of a pneumatic actuator according to any one of claims 2 to 6, wherein the relay valve includes a first shuttle valve and a second shuttle valve;
the first air inlet of the first shuttle valve and the first air inlet of the second shuttle valve are respectively connected with the manual reversing valve;
the second air inlet of the first shuttle valve and the second air inlet of the second shuttle valve are respectively connected with the valve positioner;
and the air outlet of the first shuttle valve and the air outlet of the second shuttle valve are respectively connected with the locking valve.
8. The control circuit of a pneumatic actuator according to any one of claims 3 to 6, wherein the manual directional valve and the circuit switching valve are two-position four-way control valves.
9. The control circuit of a pneumatic actuator of claim 8, further comprising: a muffler;
the muffler is connected to the exhaust port of the manual directional valve, the circuit switching valve, and/or the electromagnetic valve.
10. A pneumatic actuator, comprising: a control circuit for a pneumatic actuator and a pneumatic actuator according to any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220228431.3U CN217653341U (en) | 2022-01-27 | 2022-01-27 | Control loop of pneumatic actuator and pneumatic actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220228431.3U CN217653341U (en) | 2022-01-27 | 2022-01-27 | Control loop of pneumatic actuator and pneumatic actuator |
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| CN217653341U true CN217653341U (en) | 2022-10-25 |
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| CN202220228431.3U Active CN217653341U (en) | 2022-01-27 | 2022-01-27 | Control loop of pneumatic actuator and pneumatic actuator |
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| Country | Link |
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| CN (1) | CN217653341U (en) |
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2022
- 2022-01-27 CN CN202220228431.3U patent/CN217653341U/en active Active
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