CN200975529Y - Hydraulic steam extraction type back valve - Google Patents
Hydraulic steam extraction type back valve Download PDFInfo
- Publication number
- CN200975529Y CN200975529Y CN 200620135937 CN200620135937U CN200975529Y CN 200975529 Y CN200975529 Y CN 200975529Y CN 200620135937 CN200620135937 CN 200620135937 CN 200620135937 U CN200620135937 U CN 200620135937U CN 200975529 Y CN200975529 Y CN 200975529Y
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- China
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- valve
- valve body
- pin
- steam turbine
- sealed surface
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- Expired - Lifetime
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- Control Of Turbines (AREA)
Abstract
The utility model relates to a hydraulic gas extracting check valve, which is composed of a valve cover, a valve body, a pin, a rocker, a vale clack and a hydraulic operation device outside the valve body. Characteristically, angle of sealing pair of the valve formed by sealed surface of the valve clack and sealed surface of valve base is 25 degree. The rocker is provided with the pin. A pressure plate which is used for stirring the pin is arranged on relative position of a transmission shaft which is connected with a piston rod of the hydraulic operation device outside the valve body through a lever. For the sealing pair of the valve formed by sealed surface of the valve clack and sealed surface of valve base is 25 degree, structural length of the valve can be largely reduced. The valve is characterized in simply structure and light weight, and load of pipe is reduced. The valve can be quickly opened and closed, and the valve can be processed by special clamping fixture of common lathe. The hydraulic operation device outside the valve body can be automatically controlled with agile reaction and reliable performance. The foresaid valve can be closed within 0.5 second when accident occurs in steam turbine set in order to protect steam turbine generator and prevent accidents. Therefore, the utility model is suitable using and of steam turbine set of small thermal power station or heat supplying and gas extracting pipeline of thermoelectric plant.
Description
Technical field
The utility model relates to the special valve of a kind of heat power station Turbo-generator Set as start-stop device, specifically a kind of steam-extracting type safety check that surges.
Background technique
Steam turbine is in order to prevent that steam turbine set is when the removal of load suddenly with the safety check that draws gas, pressure in the steam turbine reduces suddenly, steam blows back in the steam turbine in exhaust tube and each heater, cause the unexpected reverse-starting braking operation running of turbine blade of changeing high speed rotating with per minute more than 3000, and then cause turbine vane is smashed, cause the serious accident of equipment such as damaging steam turbine generator and casualties, and prevent the heater system pipe leakage, and water hammer accident takes place.This Special valve China relies on import always, domestic also have produce the safety check that draws gas, mostly to adopt the sealing pair angle be 5 °, the cast iron or the Normal Steel Casting valve body of orthodrome structure to valve body, and the easy ponding of the body cavity of this structure does not particularly reach in 0.5 second throttle down rapidly.Both at home and abroad sealing pair is also arranged is 30 ° to valve, but 30 ° of valve bodies are difficult to processing by analysis, and opening resistance is big, and the circulation area of medium is little, influences the working efficiency of valve.
Summary of the invention
It is a kind of when accident appears in steam turbine set that the purpose of this utility model is to provide, and can be implemented in the steam-extracting type safety check that surges of rapid throttle down in 0.5 second.
For achieving the above object, the technological scheme that the utility model is taked is: a kind of steam-extracting type safety check that surges, comprise valve gap, valve body, bearing pin, rocking bar, flap and valve body external hydraulic Effector, it is characterized in that the secondary angle design of valve seal with flap sealing surface and sealing surface of seat formation is 25 °; One pin is set on the rocking bar, and the pressing plate that is used for stirring pin is arranged on the corresponding position of transmission shaft, and transmission shaft links to each other with piston rod in the valve body outer liquid cylinder pressure by lever.
The above-mentioned steam-extracting type safety check that surges that the utility model provides, the secondary angle of valve seal is 25 °, valve mechanism length can reduce in a large number, the valve mechanism compactness, in light weight, the pipeline load is greatly alleviated; Can realize fast opening and closing, again can be by special-purpose mold processing on engine lathe; The outside gyropilot of this valve is quick on the draw reliable working performance for surging.This valve when accident appears in steam turbine set, can be in 0.5 second throttle down rapidly, be the protection turbo-generator, prevent the quick closing valve valve that accident takes place, be particularly useful for small-sized thermal power station Turbo-generator Set and the thermoelectricity plant's heat supply pipeline of bleeding.
Description of drawings
Fig. 1 is the structural representation of steam-extracting type safety check;
Fig. 2 is the structural representation of the outside hydraulic control Effector of steam-extracting type safety check;
Fig. 3 is the inner drive part structural representation of steam-extracting type safety check.
Among the figure: the 1-valve gap; The 2-valve body; The 3-bearing pin; The 4-rocking bar; The 5-flap; The 6-lever; The 7-piston rod; The 8-oil hydraulic cylinder; The 9-spring; The 10-pressing plate; The 11-pin; The 12-transmission shaft.
Embodiment
As shown in Figure 1 to Figure 3, the steam-extracting type safety check that surges that the utility model provides, comprise valve gap 1, valve body 2, bearing pin 3, rocking bar 4 and flap 5, flap 5 links to each other with rocking bar 4, rocking bar 4 links to each other with bearing pin 3, the outside gyropilot of this valve is for surging, unlike the prior art be: the flap sealing surface is 25 ° with the valve seal pair angle of sealing surface of seat formation; One pin 11 is set on the rocking bar 4, and the pressing plate 10 that is used for stirring pin 11 is arranged on transmission shaft 12 corresponding positions, and transmission shaft 12 links to each other with piston rod 7 in the valve body outer liquid cylinder pressure 8 by lever 6.In addition, for avoiding producing hydrophobic phenomenon in the using process, the bottom design of above-mentioned valve body 2 is the cylindrical shape that matches with pipe shape.
The working principle of this hydraulic control air exhausting type safety check is: at first hydraulic control steam-extracting type safety check is installed on the pipeline according to direction shown in the valve body upward arrow, when pressure medium on the pipeline descended suddenly, valve can be closed automatically.Can close rapidly for making valve, the hydraulic control gyropilot of valve body outer installment, its oil hydraulic cylinder planted agent often keeps the liquid of certain pressure (0.02MPa) so that cylinder body remains full of state, and answers running check, prevents that cylinder body and pipeline from having the situation of leakage to take place.When controlling automatically, understand the switch situation of valve for ease of valve in the control room, valve is provided with travel control switch.For understanding the open and-shut mode of valve at any time, valve is provided with the switch direction board.Hydraulic actuator is started working when hydraulic pressure reaches 0.6MPa, piston rod 7 is descending, lever 6 drives transmission shaft 12 rotations, the pin 11 that pressing plate 10 on the transmission shaft 12 hits on the rocking bar 4 fast impels the rocking bar 4 rapid flaps 5 that drive to move downward, coincideing at 0.5 second internal valve flap seal face and sealing surface of seat makes valve closing rapidly, reaches the purpose of protection steam turbine; When hydraulic pressure dropped to 0.02MPa, spring 9 shrank by spring force, and oil hydraulic cylinder automatically resets, and can not influence the automatic unlatching of valve.
Claims (2)
1, a kind of steam-extracting type safety check that surges, comprise valve gap (1), valve body (2), bearing pin (3), rocking bar (4), flap (5) and valve body external hydraulic Effector, it is characterized in that: the secondary angle of the valve seal that flap sealing surface and sealing surface of seat form is 25 °; One pin (11) is set on the rocking bar (4), and the pressing plate (10) that is used for stirring pin (11) is arranged on the corresponding position of transmission shaft (12), and transmission shaft (12) links to each other with piston rod (7) in the valve body outer liquid cylinder pressure by lever (6).
2, the steam-extracting type safety check that surges according to claim 1, the bottom design that it is characterized in that above-mentioned valve body (2) is the cylindrical shape that matches with pipe shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620135937 CN200975529Y (en) | 2006-10-08 | 2006-10-08 | Hydraulic steam extraction type back valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620135937 CN200975529Y (en) | 2006-10-08 | 2006-10-08 | Hydraulic steam extraction type back valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200975529Y true CN200975529Y (en) | 2007-11-14 |
Family
ID=38901814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620135937 Expired - Lifetime CN200975529Y (en) | 2006-10-08 | 2006-10-08 | Hydraulic steam extraction type back valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200975529Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102808976A (en) * | 2012-08-16 | 2012-12-05 | 大连大高阀门股份有限公司 | One-section extraction check valve |
| CN106969145A (en) * | 2017-04-28 | 2017-07-21 | 深圳市能源环保有限公司 | A kind of Turbine Barring Gears rocking bar shaft sealer |
-
2006
- 2006-10-08 CN CN 200620135937 patent/CN200975529Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102808976A (en) * | 2012-08-16 | 2012-12-05 | 大连大高阀门股份有限公司 | One-section extraction check valve |
| CN106969145A (en) * | 2017-04-28 | 2017-07-21 | 深圳市能源环保有限公司 | A kind of Turbine Barring Gears rocking bar shaft sealer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20071114 |
|
| EXPY | Termination of patent right or utility model |