CN201671666U - Main throttle valve of steam turbine - Google Patents
Main throttle valve of steam turbine Download PDFInfo
- Publication number
- CN201671666U CN201671666U CN2010201432264U CN201020143226U CN201671666U CN 201671666 U CN201671666 U CN 201671666U CN 2010201432264 U CN2010201432264 U CN 2010201432264U CN 201020143226 U CN201020143226 U CN 201020143226U CN 201671666 U CN201671666 U CN 201671666U
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- piston
- oil
- cavity
- oil cylinder
- steam turbine
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- Expired - Fee Related
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Abstract
A main throttle valve of a steam turbine comprises an oil cylinder with a piston cavity, wherein a rapidly closing oil hole and an oil return hole are arranged on the side wall of the oil cylinder, the piston is arranged in the piston cavity; a valve rod is installed on the piston, a cover is installed on the other end of the oil cylinder; the piston comprises a cavity and a piston disk for closing the cavity, an oil passing hole is arranged on the side wall of the piston, a spring is arranged in the cavity, the spring is abutted between the bottom of the cavity and a spring holder, the spring holder is fixedly connected with the piston disk; a starting oil cavity is arranged on the back side of the oil cylinder, a starting oil hole communicated with the starting oil cavity is arranged on the side wall of the oil cylinder. The main throttle valve of the utility model can rapidly discharging the oil for closing the main throttle valve, in case of no infection on normal running of the steam turbine, the main throttle valve can be check whether the steam turbine is in running or stopping state to preventing jamming to make sure that the throttle valve of the steam turbine is cut off in emergency for shutting down the units.
Description
Technical field
The utility model relates to a kind of main stop valve of steam turbine.
Background technique
Steam turbine is to utilize the pressure energy of high temperature, high pressure steam and heat energy to do work through turbine expansion to drive generator or pump, blower fan, compressor etc., uses very extensive in fields such as power plant, iron and steel, petrochemical industry.Main stop valve is the main safety assurance parts between major steam line and the steam turbine, can save the admission of the turbine of cutting steam when the state of emergency immediately, makes the unit quick shutdown, prevents that the steam turbine failure operation from enlarge accident again.
Yet, because of the steam turbine operation main stop valve is in open mode for a long time, accumulate over a long period and to produce resistance to motion because of having on the movable pieces such as incrustation scale or piston because of the grease deposition on the valve rod, cause main stop valve slow in one's movements or stuck, make crucial moment between major steam line and the steam turbine and can not turn-off rapidly, cause bigger accident to take place.
Summary of the invention
But the purpose of this utility model provides a kind of main stop valve of steam turbine of quick closedown.
To achieve these goals, the utility model is taked following technical solution:
A kind of main stop valve of steam turbine comprises the oil cylinder with piston cavity, and the sidewall of oil cylinder is provided with speed and closes oilhole and spill port, and piston is positioned at piston cavity; Valve rod is installed on the piston, and lid is installed on the other end of oil cylinder; But piston has the piston plate of a cavity and enclosed cavity, and piston side wall is provided with oil through, is provided with spring in the cavity, and spring is butted between cavity diapire and the spring holder, and spring holder and piston plate are connected; The rear portion of oil cylinder is provided with the startup oil pocket, and the oil cylinder sidewall is provided with and starts the startup oilhole that oil pocket is communicated with.
Also be provided with the test oil pocket in the described oil cylinder, the oil cylinder sidewall is provided with and tests the test oilhole that oil pocket is communicated with, and described test oil pocket is positioned at the rear that starts oil pocket, is provided with in the described test oil pocket and movably tests piston.
Described piston side wall is provided with four oil throughs.
As known from the above, piston of the present utility model adopts cavity structure, and piston cavity be opened/be closed to spring can according to the variation of pressure, makes piston form confined space under certain condition, is beneficial to quick emptying in emergency circumstances; Startup oil pocket and test oil pocket in oil cylinder, have been increased; the test oil pocket makes the main stop valve oil cylinder piston move under the pressure of test oil; moving range does not influence the main stop valve throttle flow; can not produce the fluctuation of vapour amount; judge by detecting pilot pressure oil whether valve rod is stuck; or resistance is too big; need repairing; guarantee that main stop valve is in normal working, guarantee steam turbine operation safety, under the prerequisite that does not influence the normal operation of steam turbine; can regularly test action to main stop valve; prevent stuckly, save the admission of the turbine of cutting steam when guaranteeing the state of emergency immediately, make the unit quick shutdown.
Description of drawings
Structural representation when Fig. 1 closes for main stop valve of the present utility model;
Fig. 2 opens the preceding schematic representation that starts oil pocket work for main stop valve of the present utility model;
Schematic representation when Fig. 3 opens for main stop valve of the present utility model;
Schematic representation when Fig. 4 is main stop valve of the present utility model test.
Below in conjunction with accompanying drawing embodiment of the present utility model is done explanation in further detail.
Embodiment
Main stop valve of the present utility model comprises piston plate 1, nut 2, spring holder 3, spring 4, piston 5, oil cylinder 6, test piston 7 and lid 8.Wherein, valve rod 9 is installed on the piston plate 1 by nut 2, and lid 8 is installed on the other end of oil cylinder 6.
Piston 5 is positioned at the piston cavity 66 of oil cylinder 6, and piston 5 has a cavity 50, and spring 4 is located in the cavity 50 and is butted between piston 5 internal chamber walls and the spring holder 3, and spring holder 3 is connected with nut 2.Piston 6 sidewalls are provided with oil through 51.Start oil pocket 64 and be located at piston cavity 66 rear portions, test oil pocket 65 is positioned at the rear that starts oil pocket 64.Test piston 7 is positioned at test oil pocket 6.
Below working procedure of the present utility model is explained:
With reference to shown in Figure 1, for main stop valve is not having under the natural situation of oil pressure, at this moment main stop valve is in closed condition.Pressure spring 4, the elastic force of spring 4 pushes up spring holder 3 and piston plate 1 to front end (being high order end), and the cavity 50 of piston 5 is in open mode, and at this moment, speed is closed oilhole 60 and is communicated with spill port 61 by 4 oil throughs 51 on piston 5 sidewalls, and at this moment main stop valve is closed.
With reference to shown in Figure 2,, start oil and open the view that enters when starting oil pocket 64 for before main stop valve opens.Before main stop valve is opened, start oil and be introduced into startup oil pocket 64, start oil pressure and set up, piston 5 is depressed into front end (being left end) at oil pressure effect lower compression spring 4 with piston 5, and piston 5 contacts and seals with piston plate 1.At this moment, isolated fully in the cavity 50 of piston 5 and the oil cylinder 6, piston 5 forms an airtight integral body with piston plate 1, and speed is closed oilhole 60 and spill port 61 partitions.
With reference to shown in Figure 3, for feeding the working state schematic representation after speed is closed oil.When steam turbine is in running order, after adding speed pass oil, start the piston 5 and piston plate 1 airtight integral body that oil forms owing to add before starting, piston plate 1, spring 4, piston 5 integral body are moved right together, at this moment valve rod 9 interlocks are pushed to right-hand member, start the pressure release of fuel tap (not shown) damped type simultaneously, start oil and discharge gradually from starting oilhole 62, main stop valve is opened.Front portion at oil cylinder 6 forms an oil storage space, and oil pressure makes piston 5 be positioned at right-hand member.
When urgency need be shut down; speed is closed fuel tap (not shown) and is cut off speed pass oil; oil cylinder 6 anterior oil storage space oil pressure reduce; under the elastic force effect of spring 4, to left end, close oil and enter rapidly in the cavity 50 of piston 5 by speed by spring holder 3 tops for piston plate 1; speed is closed oil and is closed oilhole 60 and spill port 61 discharges simultaneously rapidly; can reach main air valve and close rapidly, save the admission of the turbine of cutting steam immediately, make the effect of unit quick shutdown.
With reference to shown in Figure 4, insert test oil during for the steam turbine proper functioning and carry out the view that test pressure detects.At the end of oil cylinder 6 test oil pocket 65 is set and is preferred version of the present utility model.At oil cylinder 6 ends test oil pocket 65 is set, places test piston 7 in the test oil pocket 65, and test piston 7 areas are greater than piston 5 areas.When steam turbine is worked, add test oil from test oilhole 63, behind the adding test oil, test piston 7 promotes piston 5, spring 4, piston plate 1 and valve rod to left movement under the effect of test oil pressure, stroke is h, this trip h does not influence the air inflow of steam turbine, the steam turbine proper functioning.After adding test oil, the test oil pressure is delivered to unit control system by instrumentation, and control system is to testing the oil pressure analysis, excessive then the warning or the shutdown maintenance.
The utility model has improved oil cylinder, piston structure, and piston is set to the structure with cavity, has increased startup oil pocket and test oil pocket.The test oil pocket makes the main stop valve oil cylinder piston move under the pressure of test oil, moving range does not influence the main stop valve throttle flow, can not produce the fluctuation of vapour amount, but can prevent incrustation scale and grease deposition, check whether piston or valve rod be stuck, unit control system is tested main stop valve by solenoid valve every day, guarantees the flexibility of its action, thereby guarantees the Security of unit.
Claims (3)
1. the main stop valve of a steam turbine comprises the have piston cavity oil cylinder (6) of (66), and the sidewall of described oil cylinder (6) is provided with speed and closes oilhole (60) and spill port (61), and piston (5) is positioned at described piston cavity (66); Valve rod (9) is installed on the piston (5), and lid (8) is installed on the other end of oil cylinder (6);
It is characterized in that:
Described piston (5) have a cavity (50) but and the piston plate (1) of enclosed cavity (50), piston (6) sidewall is provided with oil through (51), be provided with spring (4) in the described cavity (50), spring (4) is butted between cavity (50) diapire and the spring holder (3), and spring holder (3) is connected with piston plate (1);
The rear portion of described oil cylinder (6) is provided with and starts oil pocket (64), and oil cylinder (6) sidewall is provided with and starts the startup oilhole (62) that oil pocket (64) is communicated with.
2. the main air valve of steam turbine as claimed in claim 1, it is characterized in that: also be provided with test oil pocket (65) in the described oil cylinder (6), oil cylinder (6) sidewall is provided with and tests the test oilhole (63) that oil pocket (65) is communicated with, described test oil pocket (65) is positioned at the rear that starts oil pocket (64), is provided with in the described test oil pocket (65) and movably tests piston (7).
3. the main air valve of steam turbine as claimed in claim 1, it is characterized in that: described piston (6) sidewall is provided with four oil throughs (51).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201432264U CN201671666U (en) | 2010-03-26 | 2010-03-26 | Main throttle valve of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201432264U CN201671666U (en) | 2010-03-26 | 2010-03-26 | Main throttle valve of steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201671666U true CN201671666U (en) | 2010-12-15 |
Family
ID=43329078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201432264U Expired - Fee Related CN201671666U (en) | 2010-03-26 | 2010-03-26 | Main throttle valve of steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201671666U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422935A (en) * | 2015-12-12 | 2016-03-23 | 浙江杰特优动力机械有限公司 | Low-oil-pressure relief valve and pressure relief method thereof |
| EP3712473A1 (en) * | 2019-03-22 | 2020-09-23 | SMC Corporation | Fluid control valve |
-
2010
- 2010-03-26 CN CN2010201432264U patent/CN201671666U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422935A (en) * | 2015-12-12 | 2016-03-23 | 浙江杰特优动力机械有限公司 | Low-oil-pressure relief valve and pressure relief method thereof |
| EP3712473A1 (en) * | 2019-03-22 | 2020-09-23 | SMC Corporation | Fluid control valve |
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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: 20101215 Termination date: 20180326 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |