CN201786395U - Oil servo motor of steam valve for steam turbine - Google Patents
Oil servo motor of steam valve for steam turbine Download PDFInfo
- Publication number
- CN201786395U CN201786395U CN2010205360138U CN201020536013U CN201786395U CN 201786395 U CN201786395 U CN 201786395U CN 2010205360138 U CN2010205360138 U CN 2010205360138U CN 201020536013 U CN201020536013 U CN 201020536013U CN 201786395 U CN201786395 U CN 201786395U
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- oil
- valve
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- oil cylinder
- quick closing
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 32
- 230000008676 import Effects 0.000 claims description 9
- 239000000945 filler Substances 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 83
- 230000000694 effects Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Abstract
The utility model discloses an oil servo motor of steam valve for a steam turbine, which comprises a cylinder, pressure oil inlets, oil return ports, an oil filter, an electro hydraulic servo valve, a fast close spring, a displacement sensor, two fast close solenoid valves and two check valves. The displacement sensor is a built-in type magnetostrictive transducer which has two independent electronic loops arranged therein and is capable of output two identical signals. The displacement sensor is installed on the piston rod in the inner cavity of the cylinder. The outer end of the piston rod of the cylinder is connected with the valve. The fast close spring is a belleille spring installed on the piston rod of the cylinder and between the valve and the cylinder body. The displacement sensor is mounted in a built-in and noncontact manner, so that the displacement sensor is not easy to wear out. Moreover, two fully identical valve position signals of the displacement sensor are sent to two valve position controllers respectively, so as to realizing redundant configuration via controllers, feedback signals and servo valve coils, thereby greatly improving the safety and reliability of control.
Description
Technical field
The utility model relates to a kind of steam turbine steam valve oil engine.
Background technique
Oil engine is the actuator that belongs to turbine regulating system, and it is a device of realizing controlling throttle by the oil pressure of high pressure oil.General steam turbine is made up of oil cylinder, electrohydraulic control, fast valve, displacement transducer, quick closing valve spring etc. with the valve oil engine.Electrohydraulic control hopper bit instruction fills oil pocket below the piston of oil cylinder with pressure oil, and piston overcomes the active force of quick closing valve spring under the effect of pressure, with valve opening to the position that needs.Under the steam turbine emergency work condition, when requiring the valve quick closedown, the action of quick closing valve solenoid valve is connected way to cycle oil with the pressure oil of oil cylinder piston below, and valve is closed rapidly under the effect of quick closing valve spring force.
There is following shortcoming in existing steam turbine with the valve oil engine:
1. displacement transducer adopts the differential transmitter of linear displacement (LVDT) of external, and it is connected on the piston rod of oil cylinder outside, and one and two kinds of forms of two independent displacement transducers are arranged, and output signal needs to handle the back in addition and forms the 4-20mA signal.The core bar of this displacement transducer and oil engine move together, easily wearing and tearing.
2. displacement transducer also has the built-in magnetostriction type displacement transducer of employing, but output signal has only one, can not form redundancy, poor stability;
3. close spring and adopt helical spring, volume is bigger and stressed even inadequately;
4. fast valve adopts one-way valve, and the reliability of work is relatively poor.
Summary of the invention
The purpose of this utility model is in order to overcome the deficiencies in the prior art, a kind of steam turbine steam valve oil engine to be provided, and it can improve control accuracy, and safety reliability improves.
A kind of technological scheme that realizes above-mentioned purpose is: a kind of steam turbine steam valve oil engine, comprise an oil cylinder, pressure oil filler opening, return opening, an oil purifier, an electrohydraulic control, a quick closing valve spring and a displacement transducer, described oil engine also comprises two quick closing valve solenoid valves and two one-way valves.Wherein:
Described displacement transducer is built-in magnetostrictive senser, and its inside has two to be overlapped independently electronic circuit and can export two identical signals, and it is installed on the piston rod of described cylinder cavity;
The outer end of the piston rod of described oil cylinder is connected with described valve;
Described quick closing valve spring is a belleville spring, and it is installed on the piston rod of described oil cylinder and between the cylinder body of described valve and described oil cylinder;
Described pressure filler opening is connected with the import of described oil purifier; The outlet of described oil purifier is connected with the control oil inlet of described electrohydraulic control and the import of described two quick closing valve solenoid valves respectively; The control oil export of described electrohydraulic control is connected with the upper oil cavitie of described oil cylinder respectively; An outlet of described two quick closing valve solenoid valves all is connected on the described return opening, and another outlet of these two quick closing valve solenoid valves is connected with the import of described two one-way valves respectively correspondingly; An outlet of described two one-way valves all is connected with the lower oil cavitie of described oil cylinder and the control oil return opening of described electrohydraulic control connects, and another outlet of these two one-way valves all is connected with the upper oil cavitie of described oil cylinder; The lower oil cavitie of described oil cylinder also is connected with described return opening.
Above-mentioned a kind of steam turbine steam valve oil engine, wherein, two identical signals of described displacement transducer output are the 4-20mA analog signals and give two peripheral valve positioners one by one.
The technological scheme of a kind of steam turbine steam valve oil engine of the present utility model, displacement transducer adopts built-in magnetostrictive senser, install and adopt type built-in contactless, not easy to wear, importantly, two identical valve position signals of this displacement transducer output are given two valve positioners respectively, slave controller, feedback signal, servovalve coil have been realized redundant configuration, improved the safety reliability of control greatly, compared with traditional differential generator (LVDT), precision is higher; Adopt the quick closing valve solenoid valve of two redundant configuration, as long as an action is arranged, valve is just closed rapidly, has therefore improved the safety reliability under valve is nonserviceabled.In addition, close spring and adopt belleville spring, under the situation of same displacement, active force is bigger, and is stressed also more even.
Description of drawings
Fig. 1 is the hydraulic schematic diagram of steam turbine steam valve oil engine of the present utility model;
Fig. 2 is the control principle figure of steam turbine steam valve oil engine of the present utility model.
Embodiment
Below by embodiment particularly and in conjunction with the accompanying drawings the technical solution of the utility model is described:
See also Fig. 1, steam turbine steam valve oil engine of the present utility model, comprise an oil cylinder 1, pressure oil filler opening 2, return opening 3, an oil purifier 4, an electrohydraulic control 5, two quick closing valve solenoid valves 6, two quick closing valve solenoid valves 6, two one-way valves 7, a quick closing valve spring 8 and displacement transducers 9, wherein:
The outer end of the piston rod of oil cylinder 1 is connected with valve 10;
Quick closing valve spring 8 is a belleville spring, and belleville spring is under the situation of same displacement, and active force is bigger, and is stressed also more even.Quick closing valve spring 8 is installed on the piston rod of oil cylinder 1 and between the cylinder body of valve 10 and oil cylinder 1, the heat and the oil engine of valve 10 can be separated, make the oil engine temperature can not be subjected to the influence of High temperature valve, the working life of having improved hydraulic system Sealing and hydraulic oil;
The control oil export A of electrohydraulic control 5 is connected with the upper oil cavitie of oil cylinder 1 respectively;
On the return opening 3 that an outlet T of two quick closing valve solenoid valves 6 all is connected, another outlet of these two quick closing valve solenoid valves 6 is connected with the import of two one-way valves 7 respectively correspondingly;
An outlet of two one-way valves 7 all is connected with the lower oil cavitie of oil cylinder 1 and the control oil oil return inlet T of electrohydraulic control 5 connects, and another outlet of these two one-way valves 7 all is connected with the upper oil cavitie of oil cylinder 1;
The lower oil cavitie of oil cylinder 1 also is connected with return opening 3.
The working principle of steam turbine steam valve oil engine of the present utility model is:
Under the steam turbine emergency work condition, require the valve quick closedown, at this moment, 6 actions of quick closing valve solenoid valve, with the control oil oil return inlet T of the connection of the pressure oil in the upper oil cavitie of oil cylinder 1 electrohydraulic control 5, valve 10 is closed rapidly under the effect of quick closing valve spring 8 power.
Because displacement transducer 9 adopts built-in magnetostrictive senser, compares with traditional differential generator (LVDT), precision is higher, and from reliability consideration, displacement transducer 9 adopts redundant output signal.
The quick closing valve solenoid valve 6 of two redundant configuration, as long as an action is arranged, valve is just closed rapidly, charged during quick closing valve solenoid valve employing work, the mode of dead electricity during action has improved the safety reliability under nonserviceabling.
See also Fig. 2 again, the control principle of steam turbine steam valve oil engine of the present utility model is:
The valve location of the reality that valve position command signal that control system transmits and displacement transducer 9 detect relatively, deviation is delivered to valve positioner, after the computing of valve positioner passing ratio, the output control signal arrives the oil circuit break-make of the control coil of electrohydraulic control 5 with control electrohydraulic control 5 through servoamplifier 20, make high pressure oil enter the piston two ends of oil cylinder 1 as required, the aperture of control oil cylinder 1.After the stroke of oil cylinder 1 changed, displacement transducer 9 was delivered to valve positioner with corresponding aperture signal, makes system reach balance.
Because valve positioner, Displacement Feedback signal, servovalve coil all are two configurations, have realized redundant processing, as long as but the normal just proper functioning of a signal is arranged, improved the safety reliability of control system greatly.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the utility model, and be not to be used as qualification of the present utility model, as long as in connotation scope of the present utility model, all will drop in claims scope of the present utility model the above embodiment's variation, modification.
Claims (2)
1. steam turbine steam valve oil engine, comprise an oil cylinder, pressure oil filler opening, return opening, an oil purifier, an electrohydraulic control, a quick closing valve spring and a displacement transducer, it is characterized in that described oil engine also comprises two quick closing valve solenoid valves and two one-way valves
Described displacement transducer is built-in magnetostrictive senser, and its inside has two to be overlapped independently electronic circuit and can export two identical signals, and it is installed on the piston rod of described cylinder cavity;
The outer end of the piston rod of described oil cylinder is connected with described valve;
Described quick closing valve spring is a belleville spring, and it is installed on the piston rod of described oil cylinder and between the cylinder body of described valve and described oil cylinder;
Described pressure filler opening is connected with the import of described oil purifier; The outlet of described oil purifier is connected with the control oil inlet of described electrohydraulic control and the import of described two quick closing valve solenoid valves respectively; The control oil export of described electrohydraulic control is connected with the upper oil cavitie of described oil cylinder respectively; An outlet of described two quick closing valve solenoid valves all is connected on the described return opening, and another outlet of these two quick closing valve solenoid valves is connected with the import of described two one-way valves respectively correspondingly; An outlet of described two one-way valves all is connected with the lower oil cavitie of described oil cylinder and the control oil return opening of described electrohydraulic control connects, and another outlet of these two one-way valves all is connected with the upper oil cavitie of described oil cylinder; The lower oil cavitie of described oil cylinder also is connected with described return opening.
2. a kind of steam turbine steam valve oil engine according to claim 1 is characterized in that, two identical signals of described displacement transducer output are the 4-20mA analog signals and give two peripheral valve positioners one by one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205360138U CN201786395U (en) | 2010-09-20 | 2010-09-20 | Oil servo motor of steam valve for steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205360138U CN201786395U (en) | 2010-09-20 | 2010-09-20 | Oil servo motor of steam valve for steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201786395U true CN201786395U (en) | 2011-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205360138U Expired - Lifetime CN201786395U (en) | 2010-09-20 | 2010-09-20 | Oil servo motor of steam valve for steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201786395U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438040A (en) * | 2013-08-21 | 2013-12-11 | 上海汇益控制系统股份有限公司 | Hydraulic control device of high-pressure regulating valve |
| CN105443248A (en) * | 2015-11-03 | 2016-03-30 | 北京航科发动机控制系统科技有限公司 | Standby system with electro-hydraulic conversion components of different structures |
| CN108150228A (en) * | 2016-12-06 | 2018-06-12 | 上海电气电站设备有限公司 | A kind of method and system for preventing servomotor draining from causing halt turbines |
| CN110645217A (en) * | 2019-09-30 | 2020-01-03 | 上海海岳液压机电工程有限公司 | Large-flow main valve position double-feedback type high-frequency-response three-way servo pilot cartridge valve |
-
2010
- 2010-09-20 CN CN2010205360138U patent/CN201786395U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438040A (en) * | 2013-08-21 | 2013-12-11 | 上海汇益控制系统股份有限公司 | Hydraulic control device of high-pressure regulating valve |
| CN105443248A (en) * | 2015-11-03 | 2016-03-30 | 北京航科发动机控制系统科技有限公司 | Standby system with electro-hydraulic conversion components of different structures |
| CN108150228A (en) * | 2016-12-06 | 2018-06-12 | 上海电气电站设备有限公司 | A kind of method and system for preventing servomotor draining from causing halt turbines |
| CN108150228B (en) * | 2016-12-06 | 2020-06-09 | 上海电气电站设备有限公司 | Method and system for preventing steam turbine from being stopped due to oil drainage of servomotor |
| CN110645217A (en) * | 2019-09-30 | 2020-01-03 | 上海海岳液压机电工程有限公司 | Large-flow main valve position double-feedback type high-frequency-response three-way servo pilot cartridge valve |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110406 |
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| CX01 | Expiry of patent term |