CN202937312U - Turbine oil electro-hydraulic servo hydraulic actuator under double closed loop control - Google Patents
Turbine oil electro-hydraulic servo hydraulic actuator under double closed loop control Download PDFInfo
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- CN202937312U CN202937312U CN 201220655141 CN201220655141U CN202937312U CN 202937312 U CN202937312 U CN 202937312U CN 201220655141 CN201220655141 CN 201220655141 CN 201220655141 U CN201220655141 U CN 201220655141U CN 202937312 U CN202937312 U CN 202937312U
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Abstract
The utility model provides a turbine oil electro-hydraulic servo hydraulic actuator under double closed loop control, and relates to the field of turbine digital electro-hydraulic control. A control signal of a digital electro-hydraulic control system (DEH) controller is connected to a proportional servo valve, a signal of a pilot oil valve position feedback linear variable differential transformer (LVDT) passes through a pilot oil valve position feedback amplifier to be connected with the proportional servo valve, hydraulic control oil of the proportional servo valve is connected with a pulsation oil circuit and then connected with a position above a control piston through an oil pipeline, the control piston is arranged above a pilot oil valve, the pilot oil valve and the hydraulic actuator are integrated, internal connection is achieved through oil pipelines, a core bar of the pilot oil valve position feedback LVDT is connected with the pilot oil valve, and a core bar of a hydraulic actuator position feedback LVDT is connected with a piston of the hydraulic actuator. The hydraulic actuator is suitable for controlling valves of the turbine, high in precision, quick in response, non-sensitive to changes of temperature, viscosity and pressure of oil, and reliable and safe in operation.
Description
Technical field:
The utility model relates to steam turbine digital electrichydraulic control field, is specifically related to the turbine oil-electric-hydraulic engine of a kind of pair of closed loop control.
Background technique:
At present, turbine oil-electric-hydraulic engine commonly used adopts the DDV valve as electro-control converter mostly, forms impulse oil pressure, act on the pilot valve cavity of resorption, by regulating DDV valve opening, regulate impulse oil pressure and change to control the pilot valve position, thereby realize the control of oil engine piston position.Because adopting flow, regulated this electro-hydraulic servo oil engine, affected by oil temperature and Varying Oil Viscosity very large, the working position of DDV valve core often is offset, and the position of skew likely can exceed the requirement of safety control, as in the situation of DDV valve order line fault, requirement can the valve slowly closing, but because the skew of DDV valve core is excessive, may cause valve opening, the safe operation of steam turbine is threatened; And it is also very large affected by oil pressure, during pressure fluctuation, system need to be readjusted, particularly in the steam turbine start-up course, when high pressure oil pump switches to main oil pump, if the two oil pressure difference is large, switch to main oil pump after system also need to readjust.
The model utility content:
The purpose of this utility model is to provide the turbine oil-electric-hydraulic engine of a kind of pair of closed loop control, and it is applicable to control the valve of steam turbine, and its precision is higher, response is faster, insensitive to oil liquid temperature, viscosity and pressure variation, moves more reliable, safer.
In order to solve the existing problem of background technique, the utility model is by the following technical solutions: it comprises proportional servo valve 1, pilot valve 2, oil engine piston 3, pilot valve position feedback LVDT4, pilot valve position feedback amplifier 5, oil engine position feedback LVDT6, control piston 7, pulsation oil circuit 8 and DEH controller 9, the control signal of DEH controller 9 is connected to proportional servo valve 1, the signal of pilot valve position feedback LVDT 4 is by pilot valve position feedback amplifier 5, be connected to again proportional servo valve 1, the hydraulic control oil of proportional servo valve 1 is connected to pulsation oil circuit 8, be connected to again the top of control piston 7 by oil pipe line, control piston 7 is arranged on the top of pilot valve 2, pilot valve 2 and oil engine piston 3 are integrated, inside has oil circuit to connect, the core bar of pilot valve position feedback LVDT 4 is connected with pilot valve 2, the core bar of oil engine position feedback LVDT 6 is connected with oil engine piston 3.
Working principle of the present utility model is: the pressure oil of the turbine oil-electric-hydraulic engine of two closed loop controls is after duplex filter, enter proportional servo valve 1, proportional servo valve 1 is as electro-control converter, the signal that DEH controller 9 is sent is converted into hydraulic pressure signal, it is impulse oil pressure, impulse oil pressure acts on the top of control piston 7, promotes control piston 7 and pilot valve 2 and moves downward.In addition, pressure oil acts on pilot valve 2 cavity of resorptions after throttling, promotes pilot valve 2 and moves upward, pilot valve 2 moves up and down under the effect of these two power, thereby control oil engine piston 3, moves up and down, if proportional servo valve 1 oil-feed, impulse oil pressure raises, and promotes pilot valve 2 and moves downward; On the contrary, if proportional servo valve 1 is drained the oil, impulse oil pressure reduces, and pilot valve 2 moves upward.
During steam turbine operation, DEH controller 9 is transported to proportional servo valve 1 by the oil engine position command signal, proportional servo valve 1 action, impulse oil pressure changes, pilot valve 2 motions, LVDT4 is by position signal for the pilot valve position feedback, by feedback amplifier 5, sends back proportional servo valve 1, passing ratio servovalve 1, pilot valve 2, pilot valve position feedback LVDT4, pilot valve position feedback amplifier 5 etc. form inner closed loop, control exactly the position of pilot valve 2; And for the external closed-loop formed by DEH controller 9, proportional servo valve 1, pilot valve 2, oil engine piston 3, oil engine piston position feedback LVDT6 etc., after pilot valve 2 change in location, oil engine piston 3 corresponding sports, oil engine position feedback LVDT6 is transferred to DEH controller 9 by the oil engine position signal, once oil engine piston 3 arrives specified position, proportional servo valve 1 is stabilized in equilibrium position, and pilot valve 2 also is stabilized in equilibrium position, and oil engine piston 3 is static at specified position.
The utlity model has following beneficial effect: it is applicable to control the valve of steam turbine, and its precision is higher, response is faster, insensitive to oil liquid temperature, viscosity and pressure variation, moves more reliable, safer.
The accompanying drawing explanation:
Fig. 1 is structural representation of the present utility model;
Fig. 2 is control principle schematic diagram of the present utility model.
Embodiment:
With reference to Fig. 1-2, this embodiment is taked following technological scheme: it comprises proportional servo valve 1, pilot valve 2, oil engine piston 3, pilot valve position feedback LVDT4, pilot valve position feedback amplifier 5, oil engine position feedback LVDT6, control piston 7, pulsation oil circuit 8 and DEH controller 9, the control signal of DEH controller 9 is connected to proportional servo valve 1, the signal of pilot valve position feedback LVDT 4 is by pilot valve position feedback amplifier 5, be connected to again proportional servo valve 1, the hydraulic control oil of proportional servo valve 1 is connected to pulsation oil circuit 8, be connected to again the top of control piston 7 by oil pipe line, control piston 7 is arranged on the top of pilot valve 2, pilot valve 2 and oil engine piston 3 are integrated, inside has oil circuit to connect, the core bar of pilot valve position feedback LVDT 4 is connected with pilot valve 2, the core bar of oil engine position feedback LVDT 6 is connected with oil engine piston 3.
Working principle of the present utility model is: the pressure oil of the turbine oil-electric-hydraulic engine of two closed loop controls is after duplex filter, enter proportional servo valve 1, proportional servo valve 1 is as electro-control converter, the signal that DEH controller 9 is sent is converted into hydraulic pressure signal, it is impulse oil pressure, impulse oil pressure acts on the top of control piston 7, promotes control piston 7 and pilot valve 2 and moves downward.In addition, pressure oil acts on pilot valve 2 cavity of resorptions after throttling, promotes pilot valve 2 and moves upward, pilot valve 2 moves up and down under the effect of these two power, thereby control oil engine piston 3, moves up and down, if proportional servo valve 1 oil-feed, impulse oil pressure raises, and promotes pilot valve 2 and moves downward; On the contrary, if proportional servo valve 1 is drained the oil, impulse oil pressure reduces, and pilot valve 2 moves upward.
During steam turbine operation, DEH controller 9 is transported to proportional servo valve 1 by the oil engine position command signal, proportional servo valve 1 action, impulse oil pressure changes, pilot valve 2 motions, LVDT4 is by position signal for the pilot valve position feedback, by feedback amplifier 5, sends back proportional servo valve 1, passing ratio servovalve 1, pilot valve 2, pilot valve position feedback LVDT4, pilot valve position feedback amplifier 5 etc. form inner closed loop, control exactly the position of pilot valve 2; And for the external closed-loop formed by DEH controller 9, proportional servo valve 1, pilot valve 2, oil engine piston 3, oil engine piston position feedback LVDT6 etc., after pilot valve 2 change in location, oil engine piston 3 corresponding sports, oil engine position feedback LVDT6 is transferred to DEH controller 9 by the oil engine position signal, once oil engine piston 3 arrives specified position, proportional servo valve 1 is stabilized in equilibrium position, and pilot valve 2 also is stabilized in equilibrium position, and oil engine piston 3 is static at specified position.
This embodiment has following beneficial effect: it is applicable to control the valve of steam turbine, and its precision is higher, response is faster, insensitive to oil liquid temperature, viscosity and pressure variation, moves more reliable, safer.
Claims (1)
1. the turbine oil-electric-hydraulic engine of two closed loop controls, it is characterized in that it comprises proportional servo valve (1), pilot valve (2), oil engine piston (3), pilot valve position feedback LVDT (4), pilot valve position feedback amplifier (5), oil engine position feedback LVDT (6), control piston (7), pulsation oil circuit (8) and DEH controller (9), the control signal of DEH controller (9) is connected to proportional servo valve (1), the signal of pilot valve position feedback LVDT (4) is by pilot valve position feedback amplifier (5), be connected to again proportional servo valve (1), the hydraulic control oil of proportional servo valve (1) is connected to pulsation oil circuit (8), be connected to again the top of control piston (7) by oil pipe line, control piston (7) is arranged on the top of pilot valve (2), pilot valve (2) and oil engine piston (3) are integrated, inside has oil circuit to connect, the core bar of pilot valve position feedback LVDT (4) is connected with pilot valve (2), the core bar of oil engine position feedback LVDT (6) is connected with oil engine piston (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220655141 CN202937312U (en) | 2012-12-03 | 2012-12-03 | Turbine oil electro-hydraulic servo hydraulic actuator under double closed loop control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220655141 CN202937312U (en) | 2012-12-03 | 2012-12-03 | Turbine oil electro-hydraulic servo hydraulic actuator under double closed loop control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202937312U true CN202937312U (en) | 2013-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220655141 Expired - Fee Related CN202937312U (en) | 2012-12-03 | 2012-12-03 | Turbine oil electro-hydraulic servo hydraulic actuator under double closed loop control |
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| CN (1) | CN202937312U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107503995A (en) * | 2017-07-18 | 2017-12-22 | 中国航空工业集团公司西安飞行自动控制研究所 | A kind of closed-loop control steering flow distributes multichannel valve arrangement |
| CN110119591A (en) * | 2019-05-22 | 2019-08-13 | 哈尔滨汽轮机厂有限责任公司 | A kind of oil motor simulator |
-
2012
- 2012-12-03 CN CN 201220655141 patent/CN202937312U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107503995A (en) * | 2017-07-18 | 2017-12-22 | 中国航空工业集团公司西安飞行自动控制研究所 | A kind of closed-loop control steering flow distributes multichannel valve arrangement |
| CN110119591A (en) * | 2019-05-22 | 2019-08-13 | 哈尔滨汽轮机厂有限责任公司 | A kind of oil motor simulator |
| CN110119591B (en) * | 2019-05-22 | 2023-05-16 | 哈尔滨汽轮机厂有限责任公司 | Oil motor simulation device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130515 Termination date: 20141203 |
|
| EXPY | Termination of patent right or utility model |