CN105605289A - Three-breaker protection circuit of industrial pneumatic control valve actuating mechanism - Google Patents
Three-breaker protection circuit of industrial pneumatic control valve actuating mechanism Download PDFInfo
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- CN105605289A CN105605289A CN201410684797.1A CN201410684797A CN105605289A CN 105605289 A CN105605289 A CN 105605289A CN 201410684797 A CN201410684797 A CN 201410684797A CN 105605289 A CN105605289 A CN 105605289A
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Abstract
The invention provides a three-breaker protection circuit of an industrial pneumatic control valve actuating mechanism. The three-breaker protection circuit comprises a control circuit, wherein the control circuit is formed by a displacement locator, a valve position feedback device, a filter pressure reducing valve, a signal comparator, a three-way electromagnetic valve, a pressure switch and an airlock valve; an upper electrode of the signal comparator is connected with a DCS (Distributed Control System) control center and then emits two branches of electric signals; one branch of electric signal is a command signal of 4 mA to 20 mA is sent to an intelligent locator, and the other branch of the electric signal is sent to the three-way electromagnetic valve; an upper electrode of the three-way electromagnetic valve is connected with a control air source emitted from the filter pressure reducing valve; a lower electrode of the three-way electromagnetic valve is connected with the pressure switch; a lower connecting component of the pressure switch is the air lock valve; an upper electrode of the air lock valve is connected with the displacement locator; a lower electrode of the air lock valve is connected with an air inlet cavity of a pneumatic actuating mechanism; the pneumatic actuating mechanism drives a valve rod to do up-and-down regulation motion. The three-breaker protection circuit provided by the invention has the beneficial effects that self protection, namely valve position protection, is safely realized under the situation that a control valve sub system is in input power loss, input signal loss and air source loss, so that a control system is prevented from being damaged.
Description
Technical field
The present invention relates in industrial process control application, the executing agency of the automatic control Intelligent Digital formula pneumatic control valve of important events implements oneself and protects position, in order to avoid controlled system is damaged in the time of the system failure.
Background technology
Control valve is more and more important element in modern manufacturing industry in the world, type selecting is correct and safeguard that good control valve contributes to raise the efficiency, security, profitability and ecological protection ability. Process plant by become hundred even thousands of control loops form, all these control loops are connected to network and carry out operation and control by central control board, can supply product sold to produce, and comprise chemical industry, oil refining, electric power and food etc.
Each control loop is no more than the working range of requirement to ensure important parametric variable as pressure, flow, liquid level and temperature etc. through design, can guarantee like this quality of final products, each loop can be accepted and produce disturbance from its inside, these disturbance meetings produce conclusive impact to process variables, also can the exert an influence disturbance of process variables of the interaction between other loops in network.
In order to reduce the impact of these load disturbances, sensor and transmitter reclaim collection about process variables and and the set point that requires between the information of relation, then controller is processed these information and is determined how to do and just can make process variables after load disturbance occurs, return to its normal range (NR). Control valve assembly is the final element of realizing this recovery process, and control valve assembly comprises: valve body, executing agency and control annex, what the present invention is directed to is to control annex.
Summary of the invention
The present invention seeks to be to provide in a kind of industrial process control application, be set to from the control valve of common occasion: lose that gas is opened or to lose air to close different, the executing agency of the automatic control Intelligent Digital formula pneumatic control valve of important events, in the time that control valve subsystem breaks down, implement valve and protect position, to avoid control system to occur that blast, dangerous liquid overflow or the extreme case such as rotor driving.
For realizing its object, the invention provides one and comprise displacement location device, valve position feedback device, filtering pressure reducing valve, signal comparator, three-way magnetic valve, pressure switch, the control loop of air lock composition, described signal comparator higher level connects DCS control centre, through having carried out again adjusting of signal in its inside, the distorted signals that on the communication line filtering, various interference form, send again two path signal, one tunnel is that the command signal of 4～20mA is sent to intelligent positioner, to control its action, another road is sent to three-way magnetic valve, to control its action, three-way magnetic valve higher level connects the control source of the gas sending from filtering pressure reducing valve, subordinate's Bonding pressure switch, subordinate's interface unit of pressure switch is air lock, air lock higher level connects displacement locator, subordinate connects the inlet chamber of pneumatic actuator, pneumatic actuator band ovable valve stem does up-down adjustment action, the moving displacement that valve position feedback device detects valve rod is beamed back 4～20mA signal of telecommunication with backward DCS control centre, with DCS control centre composition closed-loop system.
Further; described three disconnected protection loops also comprise by signal comparator, three-way magnetic valve and pressure switch with open-loop control system that corresponding pipeline and circuit formed; so that control valve subsystem run out of steam power supply, lose the in the situation that input signal and displacement location device losing source of the gas and realize safely self-protection, and described pressure switch has danger warning function.
Learn through overtesting, the control curve of control valve the best is: equal percentage characteristics curve, other two specific characters curves: linearity curve and fast open curve are not optimal control curve. The desirable aperture of the best of control valve is: 40%-60%, and in reality, set point is everlasting in the scope of 25%-75%, and excessive or too small aperture is all unfavorable for realizing the good control to system.
The present invention is to use the control valve of equal percentage characteristics valve cage as object, control valve is being realized under the prerequisite that best aperture is optimum control by locator and valve position feedback device, design a set of control loop, be different from general control loop by some features, comparing general control loop has increased signal comparator, three-way magnetic valve and pressure switch with corresponding pipeline and circuit.
G the present invention is on the open-loop control system basis of common loop composition, add by signal comparator, three-way magnetic valve and pressure switch with another open-loop control system that corresponding pipeline and circuit formed, with DCS control centre composition closed-loop system, make the accessory system of control valve more perfect. Pressure switch in system composition has danger warning function, alarm signal can be sent to DCS control centre, center according to the control strategy of default in the control valve subsystem breaking down due to power-off, break signal with lose the caused new parameter of source of the gas and compare and calculate, after calculating completes, DCS control centre sends new command signal or reports signal for repairment the control valve subsystem breaking down.
Brief description of the drawings
Fig. 1. control valve inherent flow characteristic, curve;
Fig. 2. the disconnected protection philosophy figure of intelligent pneumatic actuator control loop three;
Fig. 3. intelligent pneumatic actuator general control circuit theory figure;
In figure, 1,2,3 represent respectively Line 1 road, No. 2 circuits, No. 3 circuits.
Detailed description of the invention
Below in conjunction with drawings and Examples, principle of the present invention is further elaborated.
Embodiment 1
As shown in Figure 2, one comprises displacement location device, valve position feedback device, filtering pressure reducing valve, signal comparator, three-way magnetic valve, pressure switch, the control loop of air lock composition, described signal comparator higher level connects DCS control centre, through having carried out again adjusting of signal in its inside, the distorted signals that on the communication line filtering, various interference form, send again two path signal, one tunnel is that the command signal of 4～20mA is sent to intelligent positioner, to control its action, another road is sent to three-way magnetic valve, to control its action, three-way magnetic valve higher level connects the control source of the gas sending from filtering pressure reducing valve, subordinate's Bonding pressure switch, subordinate's interface unit of pressure switch is air lock, air lock higher level connects displacement locator, subordinate connects the inlet chamber of pneumatic actuator, pneumatic actuator band ovable valve stem does up-down adjustment action, the moving displacement that valve position feedback device detects valve rod is beamed back 4～20mA signal of telecommunication with backward DCS control centre, with DCS control centre composition closed-loop system.
In the situation breaking down in Line 1 road: in the time that whole system is normally started, the command signal that DCS control centre sends 4～20mA is to the signal comparator in this subsystem, signal comparator sends to locator this signal after adjusting again, locator changes element by this signal by inner electricity/gas dress, open inlet air source, source of the gas enters executing agency's inner chamber through air lock, diaphragm in inner chamber is received gas extrusion, start to be with ovable valve stem to move, valve starts adjust flux, fluid pressure is reduced to outlet pressure P2 by inlet pressure P1, system starts normal work. breaking down when Line 1 road is in the situation of power-off, signal comparator detects that magnetic valve group does not have feedback signal, send immediately the information of " losing input power signal ", after magnetic valve is made dead electricity, venting is moved (setting in advance), thereby causes that air lock starts, locking, realize valve and protect position, after pressure switch detects that the pressure of gas circuit changes simultaneously, send out alarm signal to control centre, valve is protected position and is completed.
Embodiment 2
As shown in Figure 2, in the situation that No. 2 circuits break down: in the time that whole system is normally started, the command signal that DCS control centre sends 4～20mA is to the signal comparator in this subsystem, signal comparator sends to locator this signal after adjusting again, locator changes element by this signal by inner electricity/gas dress, open inlet air source, source of the gas enters executing agency's inner chamber through air lock, diaphragm in inner chamber is received gas extrusion, start to be with ovable valve stem to move, valve starts adjust flux, fluid pressure is reduced to outlet pressure P2 by inlet pressure P1, system starts normal work. be in the situation of break signal when No. 2 circuits break down, signal comparator detects that locator does not have feedback signal, send immediately the information of " losing input control signal ", command magnetic valve to make venting action (setting in advance) simultaneously, thereby cause that air lock starts, locking, realize valve and protect position, after pressure switch detects that the pressure of gas circuit changes simultaneously, send out alarm signal to control centre, valve is protected position and is completed.
Embodiment 3
As shown in Figure 2, in the situation that No. 3 circuits break down:
In the time that whole system is normally started, the command signal that DCS control centre sends 4～20mA is to the signal comparator in this subsystem, signal comparator sends to locator this signal after adjusting again, locator changes element by this signal by inner electricity/gas dress, open inlet air source, source of the gas enters executing agency's inner chamber through air lock, diaphragm in inner chamber is received gas extrusion, start to be with ovable valve stem to move, valve starts adjust flux, fluid pressure is reduced to outlet pressure P2 by inlet pressure P1, and system starts normal work. Die in the situation in source when No. 3 circuits break down, will directly cause that air lock starts, locking, realizes valve and protects position, after pressure switch detects that the pressure of gas circuit changes simultaneously, sends out alarm signal to control centre, and valve is protected position and completed.
It should be noted that the preferred embodiments of the present invention comprise that inventor is for implementing known optimal mode of the present invention. The change of preferred embodiment is apparent for those of ordinary skill in the art reading after above-mentioned explanation. Inventor wishes the rationally such change of application of those of ordinary skill, and inventor thinks and clearly states different application at this and also can realize the present invention. Therefore, the present invention includes all modifications and the equivalents of the purport of quoting in claim, this allows in applicable law. In addition, any combination of all possible change of above-mentioned key element is also comprised by the present invention, unless pointed out in addition or obvious contradiction in context at this.
Claims (2)
1. the disconnected protection of industrial pneumatic control valve executing agency three loop, comprise displacement location device, valve position feedback device, filtering pressure reducing valve, signal comparator, three-way magnetic valve, pressure switch, the control loop of air lock composition, it is characterized in that: described signal comparator higher level connects DCS control centre, through having carried out again adjusting of signal in its inside, the distorted signals that on the communication line filtering, various interference form, send again two path signal, one tunnel is that the command signal of 4～20mA is sent to intelligent positioner, to control its action, another road is sent to three-way magnetic valve, to control its action, three-way magnetic valve higher level connects the control source of the gas sending from filtering pressure reducing valve, subordinate's Bonding pressure switch, subordinate's interface unit of pressure switch is air lock, air lock higher level connects displacement locator, subordinate connects the inlet chamber of pneumatic actuator, pneumatic actuator band ovable valve stem does up-down adjustment action, the moving displacement that valve position feedback device detects valve rod is beamed back 4～20mA signal of telecommunication with backward DCS control centre, with DCS control centre composition closed-loop system.
2. a kind of industrial pneumatic control valve executing agency according to claim 1 three disconnected protection loops; it is characterized in that: described three disconnected protection loops also comprise by signal comparator, three-way magnetic valve and pressure switch with open-loop control system that corresponding pipeline and circuit formed; so that control valve subsystem run out of steam power supply, lose the in the situation that input signal and displacement location device losing source of the gas and realize safely self-protection, and described pressure switch has danger warning function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410684797.1A CN105605289A (en) | 2014-11-25 | 2014-11-25 | Three-breaker protection circuit of industrial pneumatic control valve actuating mechanism |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410684797.1A CN105605289A (en) | 2014-11-25 | 2014-11-25 | Three-breaker protection circuit of industrial pneumatic control valve actuating mechanism |
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| CN105605289A true CN105605289A (en) | 2016-05-25 |
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| CN201410684797.1A Pending CN105605289A (en) | 2014-11-25 | 2014-11-25 | Three-breaker protection circuit of industrial pneumatic control valve actuating mechanism |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107178654A (en) * | 2017-07-28 | 2017-09-19 | 安阳化学工业集团有限责任公司 | A kind of regulating valve realizes the device and method of double loop automatic switchover regulation |
| CN109343492A (en) * | 2018-11-08 | 2019-02-15 | 郭浩 | Two-wire system Process Control System protective device |
| CN114658917A (en) * | 2022-03-21 | 2022-06-24 | 无锡福斯拓科科技有限公司 | High-pressure actuating mechanism |
| CN115263445A (en) * | 2022-08-09 | 2022-11-01 | 中广核工程有限公司 | Method for controlling action of bypass regulating valve of steam turbine |
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| CN203477560U (en) * | 2013-08-15 | 2014-03-12 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Self-lock device of double-acting pneumatic actuator |
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| US20060092039A1 (en) * | 2004-11-01 | 2006-05-04 | Yokogawa Electric Corporation | Field device and method for transferring the field device's signals |
| US20080149186A1 (en) * | 2006-12-21 | 2008-06-26 | Martin Ricky L | Method and apparatus for emission management |
| CN101858457A (en) * | 2010-03-26 | 2010-10-13 | 潘辉义 | Intelligent electropneumatic valve positioner and control system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107178654A (en) * | 2017-07-28 | 2017-09-19 | 安阳化学工业集团有限责任公司 | A kind of regulating valve realizes the device and method of double loop automatic switchover regulation |
| CN109343492A (en) * | 2018-11-08 | 2019-02-15 | 郭浩 | Two-wire system Process Control System protective device |
| CN109343492B (en) * | 2018-11-08 | 2021-02-12 | 郭浩 | Two-wire system process control system protection device |
| CN114658917A (en) * | 2022-03-21 | 2022-06-24 | 无锡福斯拓科科技有限公司 | High-pressure actuating mechanism |
| CN115263445A (en) * | 2022-08-09 | 2022-11-01 | 中广核工程有限公司 | Method for controlling action of bypass regulating valve of steam turbine |
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