CN203403913U - Air leakage prevention device for medium-pressure main steam valve - Google Patents
Air leakage prevention device for medium-pressure main steam valve Download PDFInfo
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- CN203403913U CN203403913U CN201320529492.4U CN201320529492U CN203403913U CN 203403913 U CN203403913 U CN 203403913U CN 201320529492 U CN201320529492 U CN 201320529492U CN 203403913 U CN203403913 U CN 203403913U
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- oil inlet
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- inlet pipe
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Abstract
The utility model discloses an air leakage prevention device for a medium-pressure main steam valve, and relates to air leakage prevention technologies of medium-pressure main steam valves in turbines. The air leakage prevention device aims to solve the problem that air leakage of valve rods happens frequently in the running process of the medium-pressure main steam valves of turbine sets. According to the air leakage prevention device, a magnetic valve is arranged between an oil inlet end and an oil outlet end of a first oil inlet pipe, the oil inlet ends of two oil inlet pipes are communicated with an oil tank, the oil outlet ends of the two oil inlet pipes are communicated with an oil inlet end of an oil control tripping valve of the medium-pressure main steam valve, the oil outlet end of the first oil inlet pipe and the oil outlet end of the second oil inlet pipe are communicated with the oil tank, one end of an oil return pipe is communicated with the oil inlet end of the oil control tripping valve, and the other end of the oil return pipe is communicated with the oil tank. By means of the air leakage prevention device, the oil control tripping valve can always be kept in a closed state, time slots for washing a protruded gasket and dirt between shafts do not exist, generated axial force presses a left sealing piece tightly, and air leakage of the medium-pressure main steam is prevented. The air leakage prevention device is applied to the turbine sets with generated energy more than 300MW.
Description
Technical field
The utility model relates to the anti-gas-leak technology of pressing main stop valve in steam turbine.
Background technique
Steam turbine set more than 300MW, in running, often there is the phenomenon of valve stem leakoff in middle pressure main stop valve, if issue handling is improper, valve stem leakoff continues, and has not only increased again the hear rate of unit, also increased the loss of chemical water, meanwhile, leak for a long time vapour and easily tie oxidation scale between sleeve 9 and protruding packing ring 10, gently valve stem leakoff aggravation, heavy bring the hidden danger of bite also to middle pressure main stop valve, thus unit hypervelocity caused; Therefore, 8 controls of solution valve stem leakoff improvement oil control tripping operation valve are also most important.Middle pressure main stop valve bar structure is as depicted in figs. 1 and 2: when unit normally moves, oil control tripping operation valve 8 is in closed condition, under high-pressure steam pressure effect in valve pocket by the A chamber entering along rotating shaft 11 axial clearances, after the build-up pressure of A chamber, axle 11 is pushed to left side and made between the sleeve in 1 figure 9 and protruding packing ring 10 and the shaft shoulder, to fit tightly in figure, play seal action, while only having considered unit operation in the past, oil control tripping operation valve 8 is in closed condition, the seal action fitting tightly between the sleeve 9 of valve and protruding packing ring 10 and the shaft shoulder, and ignored before opening machine or after shutting down, before middle main valve, vapor pressure is still very high, but because oil control tripping operation valve 8 is in open mode, A chamber cannot build-up pressure, cause the close face in Fig. 1 to fit tightly, so that part high temperature and high pressure steam flows through between sealing surface, sealing surface is formed and washes away etch fouling, of long duration, cause sealing surface laminating not tight, also easily cause middle main valve door-hinge 11 to leak vapour aggravation, cause bite phenomenon also easily to middle pressure main stop valve.And in heat and bypath system, cannot block high temperature and high pressure steam and enter before middle pressure main stop valve again in main steam; beating under gate stop-start state simultaneously; oil control tripping operation valve 8 also cannot cut out; therefore; inevitably can damage threshold shaft seal in original system etc., be to cause equipment to damage in advance in the course of time.
Model utility content
The purpose of this utility model is in running, often to occur the problem of valve stem leakoff in order to solve the middle pressure main stop valve of steam turbine set, and a kind of air-leakage preventing device for pressure main stop valve is provided.
Air-leakage preventing device for pressure main stop valve described in the utility model comprises solenoid valve 1, the first oil inlet pipe 2, the second oil inlet pipe 3, return tube 4 and fuel tank 6, between the oil inlet end of described the first oil inlet pipe 2 and oil outlet end, be provided with solenoid valve 1, the oil inlet end of the first oil inlet pipe 2 is all communicated with fuel tank 6 with the oil inlet end of the second oil inlet pipe 3, the oil outlet end of the first oil inlet pipe 2 is pressed the oil inlet end of the oil control tripping operation valve 8 of main stop valve in being all communicated with the oil outlet end of the second oil inlet pipe 3, one end of return tube 4 is used for being communicated with the oil inlet end of oil control tripping operation valve 8, and the other end of return tube 4 is communicated with fuel tank 6.
No matter the air-leakage preventing device for pressure main stop valve described in the utility model is in unit operation or shutdown, maybe need stop long period or boiler while boosting warming-up when receiving unit; can remain that oil control tripping operation valve 8 is in closed condition; do not leave time slot and wash away protruding packing ring 10 and 11 foulings of axle; guaranteed the pressure in chamber 7; the axial force producing is compressed left side Sealing; play seal action, prevented middle pressure main stop valve gas leakage.
Accompanying drawing explanation
Fig. 1 is middle pressure main stop valve bar structural drawing;
Fig. 2 is the I portion enlarged view of Fig. 1;
Fig. 3 is the schematic diagram of the air-leakage preventing device for pressure main stop valve described in the utility model.
Embodiment
Embodiment one: present embodiment is described in conjunction with Fig. 3, the air-leakage preventing device for pressure main stop valve described in present embodiment comprises solenoid valve 1, the first oil inlet pipe 2, the second oil inlet pipe 3, return tube 4 and fuel tank 6, between the oil inlet end of described the first oil inlet pipe 2 and oil outlet end, be provided with solenoid valve 1, the oil inlet end of the first oil inlet pipe 2 is all communicated with fuel tank 6 with the oil inlet end of the second oil inlet pipe 3, the oil outlet end of the first oil inlet pipe 2 is pressed the oil inlet end of the oil control tripping operation valve 8 of main stop valve in being all communicated with the oil outlet end of the second oil inlet pipe 3, one end of return tube 4 is used for being communicated with the oil inlet end of oil control tripping operation valve 8, the other end of return tube 4 is communicated with fuel tank 6.
When unit opens machine fortune, crude oil motivational system oil supply control tripping operation valve 8 cavity of resorption fuel feeding, fit tightly between the sleeve 9 in making and protruding packing ring 10 and the shaft shoulder on the left of after vapor pressure is set up in chamber 7, axle 11 being pushed to, play seal action, when central pressure main stop valve is closed, oil control tripping operation valve 8 oil drain valves are closed rapidly, open solenoid valve 1 oil supply control tripping operation valve 8 fuel feeding of independent oil supply device simultaneously, vapor pressure is set up in chamber 7 again, described vapor pressure is pushed axle 11 to again left side, make to fit tightly between sleeve 9, protruding packing ring 10 and the shaft shoulder, played seal action, when unit opens machine, the independent oil supply device of middle pressure main stop valve stops oil supply control tripping operation valve 8 fuel feeding, oil control tripping operation valve 8 is by original oil supply system fuel feeding, with these holding chamber 7 vapor pressures, and then play seal action, like this no matter be in operation or shutdown, maybe when receiving unit, need stop long period or boiler while boosting warming-up, oil control tripping operation valve 8 is all the time in closed condition, do not leave time slot and wash away protruding packing ring 10 and 11 foulings of axle, guaranteed the pressure in chamber 7, the axial force producing is compressed left side Sealing, play seal action, thereby guarantee Security and the Economy of unit, during unit operation, oil control tripping operation valve 8 can not be opened, otherwise may cause that middle pressure main stop valve is not opened, middle pressure main stop valve cannot normally be closed or close slowly.
Embodiment two: the difference of the air-leakage preventing device for pressure main stop valve described in present embodiment and mode of execution one is: described air-leakage preventing device also comprises state position switch, described state position switch is arranged on the LVDT place of middle pressure main stop valve oil outer motivation, and described state position is for position, side valve position closed condition.
In the middle of while pressing main stop valve to close, when DCS receives and presses main stop valve valve plate to be closed to bit instruction in LVDT feedback, DCS controls oil control tripping operation valve 8 oil drain valves and closes rapidly.
Embodiment three: the difference of the air-leakage preventing device for pressure main stop valve described in present embodiment and mode of execution two is: described state position switch is magnetic switch or dry reed-pipe.
Embodiment four: present embodiment is described in conjunction with Fig. 3, the difference of the air-leakage preventing device for pressure main stop valve described in present embodiment and mode of execution one, two or three is: described device also comprises two check valves 5, and described two check valves 5 are separately positioned between the oil inlet end of the first oil inlet pipe 2 and oil outlet end and between the oil inlet end and oil outlet end of the second oil inlet pipe 3.
Two check valves 5 are used for guaranteeing that an oil inlet pipe 2 and the interior oil of the second oil inlet pipe 3 can only flow to oil control tripping operation valve 8 from fuel tank.
Embodiment five: the difference of the air-leakage preventing device for pressure main stop valve described in present embodiment and mode of execution one, two or three is: described device also comprises warning device and controller, described warning device is for monitoring the state of oil control tripping operation valve 8, the tripping operation valve state signal input end of described controller connects the state signal output terminal of oil control tripping operation valve 8, and the alarm control signal output terminal of controller connects the alarm control signal input end of warning device.
Described warning device can guarantee that oil control tripping operation valve 8, in cutting out monitor state, has also guaranteed unit safety operation when preventing leak-stopping vapour before the machine of rising or after shutting down.
Claims (5)
1. for the air-leakage preventing device of pressure main stop valve, it is characterized in that: it comprises solenoid valve (1), the first oil inlet pipe (2), the second oil inlet pipe (3), return tube (4) and fuel tank (6), between the oil inlet end of described the first oil inlet pipe (2) and oil outlet end, be provided with solenoid valve (1), the oil inlet end of the first oil inlet pipe (2) is all communicated with fuel tank (6) with the oil inlet end of the second oil inlet pipe (3), the oil outlet end of the first oil inlet pipe (2) is pressed the oil inlet end of the oil control tripping operation valve (8) of main stop valve in being all communicated with the oil outlet end of the second oil inlet pipe (3), one end of return tube (4) is communicated with the oil inlet end of oil control tripping operation valve (8), the other end of return tube (4) is communicated with fuel tank (6).
2. the air-leakage preventing device for pressure main stop valve according to claim 1, it is characterized in that: it also comprises state position switch, described state position switch is arranged on the LVDT place of middle pressure main stop valve oil outer motivation, and described state position is for position, side valve position closed condition.
3. the air-leakage preventing device for pressure main stop valve according to claim 2, is characterized in that: described state position switch is magnetic switch or dry reed-pipe.
4. according to the air-leakage preventing device for pressure main stop valve described in claim 1,2 or 3, it is characterized in that: it also comprises two check valves (5), described two check valves (5) are separately positioned between the oil inlet end of the first oil inlet pipe (2) and oil outlet end and between the oil inlet end and oil outlet end of the second oil inlet pipe (3).
5. according to the air-leakage preventing device for pressure main stop valve described in claim 1,2 or 3, it is characterized in that: it also comprises warning device and controller, described warning device is used for monitoring the state of oil control tripping operation valve (8), the tripping operation valve state signal input end of described controller connects the state signal output terminal of oil control tripping operation valve (8), and the alarm control signal output terminal of controller connects the alarm control signal input end of warning device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320529492.4U CN203403913U (en) | 2013-08-28 | 2013-08-28 | Air leakage prevention device for medium-pressure main steam valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320529492.4U CN203403913U (en) | 2013-08-28 | 2013-08-28 | Air leakage prevention device for medium-pressure main steam valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203403913U true CN203403913U (en) | 2014-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320529492.4U Expired - Lifetime CN203403913U (en) | 2013-08-28 | 2013-08-28 | Air leakage prevention device for medium-pressure main steam valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203403913U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112302735A (en) * | 2020-10-26 | 2021-02-02 | 华北电力科学研究院有限责任公司 | Steam turbine main valve auxiliary system and control method thereof |
-
2013
- 2013-08-28 CN CN201320529492.4U patent/CN203403913U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112302735A (en) * | 2020-10-26 | 2021-02-02 | 华北电力科学研究院有限责任公司 | Steam turbine main valve auxiliary system and control method thereof |
| CN112302735B (en) * | 2020-10-26 | 2022-08-02 | 华北电力科学研究院有限责任公司 | Steam turbine main valve auxiliary system and control method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140122 |
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| CX01 | Expiry of patent term |