CN208900737U - A kind of servo valve structure of steam turbine generator - Google Patents
A kind of servo valve structure of steam turbine generator Download PDFInfo
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- CN208900737U CN208900737U CN201821486747.2U CN201821486747U CN208900737U CN 208900737 U CN208900737 U CN 208900737U CN 201821486747 U CN201821486747 U CN 201821486747U CN 208900737 U CN208900737 U CN 208900737U
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Abstract
The utility model relates to a kind of servo valve structures of steam turbine generator, including valve deck, valve rod, valve disc, valve seat and valve disc sleeve, valve disc, which can slide up and down, to be connected in valve disc sleeve, stop nut and equalizing valve are equipped in valve disc, it is offered at the center of valve disc and the matched valve opening of equalizing valve, stop nut is fixed in valve disc and is spaced apart in the vertical direction with equalizing valve, the lower end of valve rod is protruded into valve disc and is fixedly connected with equalizing valve, the position that the side wall upper part of valve disc sleeve offers several steaming holes and steaming hole is higher than the position of valve disc upper surface when valve disc is pressed on valve seat.Advantage is, before valve opening, the pressure difference at valve disc or more position can be reduced by equalizing valve, is conducive to the smooth unlatching of main valve；The top of valve disc sleeve opens up several steaming holes, and when valve opening state, the pressure difference above and below valve disc increases, and stop nut is pressed in the upper surface of equalizing valve, avoids the generation that valve rod is moved up and down or shaken.
Description
Technical field
The utility model belongs to waste incineration and generating electricity field, and in particular to a kind of servo valve structure of steam turbine generator.
Background technique
Deh control system is the Digital Electru Hydranlic control system that Turbo-generator Set realizes closed-loop control, steamer hair
Motor group is controlled device.Servo valve is the important component of DEH, and each steam turbine is provided with servo valve, unit
In normal course of operation, system controls the output power of unit by servo valve.Work as electric network fault, opening and closing can be passed through
It adjusts valve to prevent Steam Turbine Over-speed Accident, and maintains unit isolated operation or idle running under egulation rotating speed by adjusting aperture.It adjusts
The movement of steam valve, which relies primarily on high pressure oil system actuator, an electrohydraulic servo valve and a linear voltage displacement transmitter.
High pressure oil supplies electrohydraulic servo valve through filter screen, which receives the valve position signal of servo amplifier, to control execution
Mechanism；Simultaneous displacement transmitter exports the analog signal of an expression valve position, and feedback arrives servo amplifier, forms a closed loop and returns
Road.
The effect of servo valve be according to control unit instruction change enter steam turbine steam flow so that unit by
Control parameter (power or revolving speed, initial steam pressure, back pressure etc.) meets service requirement.Servo valve is mainly by regulating valve, driver
Structure and oil motor three parts are at wherein regulating valve includes valve rod, valve beam, valve disc and valve seat etc..
The valve disc of existing servo valve is pressed at valve seat because of the effect of upper and lower air pressure difference and dead weight, therefore is opened
When need oil motor to provide relatively large power just valve disc to be made above to mention and open main valve, thus in order to keep main valve more suitable
The unlatching of benefit usually it is contemplated that Yu Qi mechanism is arranged at valve disc to eliminate the draught head of valve disc or more, but existing pre- is opened
There are design defect for mechanism, often will appear valve rod and shake and collide steam valve inner part and generate noise and damage corresponding component
The technical issues of, the regulatory function of servo valve is influenced, and cause to shut down even more serious accident.
Utility model content
The utility model provides a kind of servo valve structure of steam turbine generator, it is desirable to provide a kind of structure design more adduction
Reason can effectively eliminate valve rod shaking, to reduce the servo valve structure of servo valve probability of malfunction.
The technical solution that the utility model solves above-mentioned technical problem is as follows: a kind of servo valve knot of steam turbine generator
Structure, including valve deck, valve rod, valve disc, valve seat and valve disc sleeve, valve disc sleeve upper end are fixedly connected with the valve deck bottom,
The valve disc, which can slide up and down, to be connected in the valve disc sleeve, the valve seat be fixed on steam valve go out vapour channel in and with institute
State valve disc matching to correspond to, stop nut and equalizing valve be equipped in the valve disc, offered at the center of the valve disc with it is described pre-
The matched valve opening of valve is opened, the stop nut is fixed in the valve disc and is spaced apart in the vertical direction with the equalizing valve,
The lower end of the valve rod is protruded into the valve disc and is fixedly connected with the equalizing valve, and the side wall upper part of the valve disc sleeve opens up
There is the position in several steaming holes and the steaming hole to be higher than the valve disc upper surface when valve disc is pressed on the valve seat
Position.
Based on the above technical solution, the utility model can also do following improvement.
Further, the valve disc is vertically arranged cylindrical shape and a disc, institute are fixed in internal middle position
State the center point that valve opening is opened in the disc.
Beneficial effect using above-mentioned further scheme is to guarantee that equalizing valve, valve opening, valve disc, valve disc sleeve and valve rod are same
Axis, so that valve rod is not subject to the effect of eccentric force when guaranteeing valve opening and being closed, thus more laborsaving.
Further, the quantity in the steaming hole is that two and radial symmetric are distributed on the side wall of the valve disc sleeve.
Beneficial effect using above-mentioned further scheme is two steaming gas inlet holes, then valve disc sleeve is not substantially when air inlet
By the effect of uneven direction force, to avoid valve disc sleeve easily damaged persistently by horizontal force action；Two steaming holes can also
Enough guarantee lasting ventilation effect and resist the ability surprisingly blocked, a hole plug, another hole still being capable of air inlet.
Further, the airflow direction in the line with the inlet channel of steam valve in two steaming holes is identical and along level
Direction.
Beneficial effect using above-mentioned further scheme is to facilitate air inlet.
Further, the outer diameter of the valve disc is 140-160mm, and the internal diameter in the steaming hole is 10-12mm.
Beneficial effect using above-mentioned further scheme is that steaming hole can guarantee on the valve disc and valve disc sleeve of above-mentioned size
Position pressure difference appropriate above and below valve disc, it is ensured that valve disc is easy to open laborsaving and the case where valve disc shaking does not occur.
Compared with prior art, the utility model has the beneficial effects that
Equalizing valve is provided in valve disc, equalizing valve is moved up with valve rod by a small margin first before valve opening, is had small flow and is steamed
Vapour enters valve disc top by the valve opening of valve disc, to reduce the pressure difference at valve disc or more position, is conducive to the smooth unlatching of main valve,
Simultaneously because the valve opening size of equalizing valve is than valve disc smaller outer diameter, therefore convenient for carrying out red switch simultaneously to steam turbine with small flow steam
Raising speed；The top of valve disc sleeve opens up several steaming holes, can be entered directly into the main steam in vapour channel by valve disc sleeve
Valve disc upper chamber, top when entering upper chamber from the gap between valve disc sleeve and valve disc compared to steam before non-aperture
Pressure increased (valve is in the open state), and the pressure difference above and below valve disc increases, and be conducive to the stop nut in valve disc
Lower surface is pressed in the upper surface of equalizing valve, then when steam flow is smaller, valve disc avoids valve rod and move up and down without sinking space
Or the generation shaken, so as to avoid the collsion damage between stop nut and equalizing valve.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of the servo valve structure of steam turbine generator provided by the utility model；
Fig. 2 is the schematic diagram after splitting at the dotted line of vertical direction along Fig. 1.
In attached drawing, parts list represented by the reference numerals are as follows:
1. valve deck；2. valve rod；3. valve disc；4. valve seat；5. valve disc sleeve；6. stop nut；7. equalizing valve；8. steaming hole.
Specific embodiment
The principles of the present invention and feature are described below in conjunction with attached drawing, example is served only for explaining that this is practical
It is novel, it is not intended to limit the scope of the utility model.
As shown in Fig. 1 to 2, the utility model provides a kind of servo valve structure of steam turbine generator, including valve deck 1, valve
Bar 2, valve disc 3, valve seat 4 and valve disc sleeve 5,5 upper end of valve disc sleeve are fixedly connected with 1 bottom of valve deck, the valve disc 3
Can slide up and down and be connected in the valve disc sleeve 5, the valve seat 4 be fixed on steam valve go out vapour channel in and with the valve disc
3 matchings correspond to, and stop nut 6 and equalizing valve 7 are equipped in the valve disc 3, offer at the center of the valve disc 3 and pre- open with described
The matched valve opening of valve 7, the stop nut 6 are fixed in the valve disc 3 and are spaced in the vertical direction with the equalizing valve 7
It opens, the lower end of the valve rod 2 is protruded into the valve disc 3 and is fixedly connected with the equalizing valve 7, the side wall of the valve disc sleeve 5
Top offers several steaming holes 8 and the position in the steaming hole 8 and is pressed in Shi Suoshu on the valve seat 4 higher than the valve disc 3
The position of 3 upper surface of valve disc.
Further, the valve disc 3 is vertically arranged cylindrical shape and a disc, institute are fixed in internal middle position
State the center point that valve opening is opened in the disc.
Further, the quantity in the steaming hole 8 is the side wall for being distributed in the valve disc sleeve 5 of two and radial symmetric
On.
Further, the airflow direction in the line with the inlet channel of steam valve in two steaming holes 8 is identical and along water
Square to.
Further, the outer diameter of the valve disc 3 is 140-160mm, and the internal diameter in the steaming hole 8 is 10-12mm.
It should be noted that the effect of equalizing valve is exactly when main valve (valve disc) is also not operating, some vapor passes through
Gap between valve disc sleeve and main valve enters equalizing valve region, then valve disc sleeve bears downward pressure, if being not provided with pre-
Opening valve, then the partial pressure is overcome when Open valve is lifted up valve disc by oil motor, and vapour pressure increases when compression, so that valve disc
It is promoted difficult, then influences the smooth unlatching of valve, after equalizing valve is arranged, when Open valve, equalizing valve acts in advance with valve rod, meeting
After thering is small flow steam to enter main valve by valve core of pre-inlet valve, to reduce pressure difference before and after main valve, be conducive to smoothly opening for main valve
It opens, simultaneously as the latus rectum of equalizing valve is much smaller compared with stop valve, it is convenient for carrying out red switch to steam turbine with small flow steam and rising
Speed.
Equalizing valve is located in stop valve spool, and valve core of pre-inlet valve is connected directly between on stop valve valve rod, stop valve oil motor
After starting movement, equalizing valve is first opened, after the stop nut on equalizing valve and main valve plug contacts, stop valve is just in the band of valve rod
It is gradually opened again under dynamic.Applicant once check servo valve when find, 2 be arranged symmetrically between stop nut and main valve
1 in a fixing pin falls missing in operation, though another 1 fixing pin is in situ, there is also injury marks.It adopts
The mode being welded and fixed at pin loss is handled.But after operation 1 year or so, there is servo valve and adjust mistake
Control, main valve plug is detached from valve rod when Disintegration overhaul.Adjusting valve to shake equalizing valve with stop nut frequent impact is that the portion of causing covers
The immediate cause of coupling part separation.When normal operation, some vapor is entered by the gap between valve disc sleeve and main valve plug
To the upper area of main valve plug, after throttling, pressure is less than the steam pressure after main valve.Main valve plug is by upper chamber's vapour
The vapour pressure of pressure, gravity itself and main valve plug lower part.Under certain small steam flow, main valve plug epicoele chamber pressure is added
The gravity of itself is greater than main valve plug low pressure, may result in main valve plug sinking, causes pressure rise before machine, anti-according to pressure
Feedback, DEH issue instruction and open big tune valve, show valve shaking.Main valve plug sinking valve rod, which above mentions, will lead to stop nut lower surface
It is collided with equalizing valve block upper surface, when pitch shakes, collides and frequently occur, will lead to stop nut and main valve plug connecting pin damages
Bad, screw thread loosens, and finally special nut is separated with main valve plug, and valve is adjusted to lose regulatory function, leads to shut down even serious thing
Therefore.
By opening appropriately sized hole on certain altitude valve disc sleeve, (position of hole is higher than valve disc to the utility model
The position of upper surface), main steam can enter directly into main valve plug top by valve disc sleeve, between the pressure of upper chamber is compared
It increased compared with when main valve plug gap passes through from valve disc sleeve, the pressure difference above and below main valve plug increases, so that main valve limits spiral shell
Female lower surface is contacted with equalizing valve upper surface, and when steam flow is smaller, main valve avoids the hair for adjusting valve to shake without sinking space
It is raw.
It is emphasized that each unit in position of the aperture of valve valve disc sleeve punching, quantity and punching is adjusted to be not necessarily the same.
Firstly the need of the position according to valve disc sleeve and the structure choice aperture of main valve plug, position of opening, which not will lead to (being blocked), to be changed
It makes to no effect.According to adjusting, valve shakes gap circumferential between parameter, valve disc sleeve and the valve disc of condition range steam, pitch executes
The power output of mechanism determines that aperture size is excessive and quantity if aperture is excessive or quantity is excessive it is big to may cause spool lifting force
Amount increases, and causes to open difficult.Pore quantity is smaller and aperture is too small, may cause transformation to no effect.Meanwhile this transformation ensures
Equalizing valve is without bite phenomenon, otherwise under abnormality, may cause steam turbine and exceeds the speed limit accident.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (5)
1. a kind of servo valve structure of steam turbine generator, including valve deck (1), valve rod (2), valve disc (3), valve seat (4) and valve disc
Sleeve (5), valve disc sleeve (5) upper end are fixedly connected with the valve deck (1) bottom, and the valve disc (3) can slide up and down
It is connected in the valve disc sleeve (5), the valve seat (4) is fixed on going out in vapour channel and matching with the valve disc (3) for steam valve
It is corresponding, which is characterized in that be equipped with stop nut (6) and equalizing valve (7) in the valve disc (3), opened at the center of the valve disc (3)
Equipped with the equalizing valve (7) matched valve opening, the stop nut (6) is fixed in the valve disc (3) and pre- opens with described
Valve (7) is spaced apart in the vertical direction, and the lower end of the valve rod (2) is protruded into the valve disc (3) and solid with the equalizing valve (7)
Fixed connection, the side wall upper part of the valve disc sleeve (5) offers several steaming holes (8) and the position in the steaming hole (8) is higher than
The position of the valve disc (3) valve disc (3) upper surface when being pressed on the valve seat (4).
2. a kind of servo valve structure of steam turbine generator according to claim 1, which is characterized in that the valve disc (3)
The cylindrical shape that is vertically arranged and it is fixed with a disc in internal middle position, the valve opening is opened in the disc
The center point.
3. a kind of servo valve structure of steam turbine generator according to claim 2, which is characterized in that the steaming hole
(8) quantity is that two and radial symmetric are distributed on the side wall of the valve disc sleeve (5).
4. a kind of servo valve structure of steam turbine generator according to claim 3, which is characterized in that two steamings
The line in hole (8) is identical as the airflow direction in the inlet channel of steam valve and in the horizontal direction.
5. a kind of servo valve structure of steam turbine generator according to claim 4, which is characterized in that the valve disc (3)
Outer diameter be 140-160mm, the internal diameter of the steaming hole (8) is 10-12mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821486747.2U CN208900737U (en) | 2018-09-12 | 2018-09-12 | A kind of servo valve structure of steam turbine generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821486747.2U CN208900737U (en) | 2018-09-12 | 2018-09-12 | A kind of servo valve structure of steam turbine generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208900737U true CN208900737U (en) | 2019-05-24 |
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ID=66572101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821486747.2U Active CN208900737U (en) | 2018-09-12 | 2018-09-12 | A kind of servo valve structure of steam turbine generator |
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| Country | Link |
|---|---|
| CN (1) | CN208900737U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112651093A (en) * | 2020-12-30 | 2021-04-13 | 哈尔滨汽轮机厂有限责任公司 | Method for calculating steam unbalance force of steam turbine valve |
| CN114658498A (en) * | 2020-12-23 | 2022-06-24 | 上海电气电站设备有限公司 | Steam turbine combined valve and design method thereof |
-
2018
- 2018-09-12 CN CN201821486747.2U patent/CN208900737U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114658498A (en) * | 2020-12-23 | 2022-06-24 | 上海电气电站设备有限公司 | Steam turbine combined valve and design method thereof |
| CN114658498B (en) * | 2020-12-23 | 2024-03-19 | 上海电气电站设备有限公司 | Combined valve of steam turbine and design method thereof |
| CN112651093A (en) * | 2020-12-30 | 2021-04-13 | 哈尔滨汽轮机厂有限责任公司 | Method for calculating steam unbalance force of steam turbine valve |
| CN112651093B (en) * | 2020-12-30 | 2023-04-21 | 哈尔滨汽轮机厂有限责任公司 | Calculation method for steam unbalance force of steam turbine valve |
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