CN201292865Y - Low-pressure shaft seal sealing device for steam turbine - Google Patents
Low-pressure shaft seal sealing device for steam turbine Download PDFInfo
- Publication number
- CN201292865Y CN201292865Y CNU2008202203123U CN200820220312U CN201292865Y CN 201292865 Y CN201292865 Y CN 201292865Y CN U2008202203123 U CNU2008202203123 U CN U2008202203123U CN 200820220312 U CN200820220312 U CN 200820220312U CN 201292865 Y CN201292865 Y CN 201292865Y
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- Prior art keywords
- steam
- shaft seal
- steam turbine
- low
- pressure
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Abstract
The utility model relates to a sealing part of a low-pressure shaft seal of a steam turbine, which belongs to the field of steam turbines and comprises a low-pressure rotor, a lower steam supply pipe, a shaft seal steam return cavity, a lower steam return pipe, a non-contact lug boss seal gear and a shaft seal steam supply cavity. The sealing part is characterized in that the shaft seal steam supply cavity at the upper end of the sealing part is connected with an upper steam supply pipe. The utility model aims at improving the sealing effect of the low-pressure shaft seal of the steam turbine, preventing the leakage of outside air, effectively maintaining and reducing the steam discharging pressure of the steam turbine, and lowering the generating coal consumption.
Description
One, technical field:
The utility model relates to a kind of sealed member of steam turbine low pressure shaft seal, belongs to the steam turbine field.
Two, background technique:
Steam turbine is the capital equipment of firepower, Nuclear Power Station, and the steam discharge of its low pressure (LP) cylinder is a negative pressure, therefore needs the end of countershaft and exhaust casing to seal, and prevents bleeding of air, effectively keeps the vacuum of vapour condenser.The designing and arranging steam pressure of condensing steam turbine is generally about 5kPa (absolute pressure), the quality of steam turbine low pressure shaft seal sealing effect, directly influence the size of exhaust steam pressure, the bad meeting of sealing effect raises the exhaust steam pressure of steam turbine, influence the Economy of unit, the every rising 1kPa of exhaust steam pressure (absolute pressure) can make gross coal consumption rate rise about 1%, i.e. the 3g/kW.h standard coal.For realizing the target of country's " energy-saving and emission-reduction ", development novel practical, reliable steam turbine low pressure shaft seal seal arrangement prevent bleeding of outside air, effectively keep and reduce steam turbine exhaust pressure being very important.
Three, summary of the invention:
1, goal of the invention: the utility model provides a kind of easy, reliable steam turbine low pressure shaft seal seal arrangement, its purpose is to improve the sealing effect of steam turbine low pressure shaft seal, prevent bleeding of outside air, effectively keep and reduce steam turbine exhaust pressure, reduce gross coal consumption rate.
2, technological scheme: the utility model is achieved through the following technical solutions:
A kind of steam turbine low pressure shaft seal seal arrangement, this device includes low pressure rotor, steam supply pipe, axle envelope back-steam chamber, following return tube, contactless boss seal tooth and shaft seal steam chamber down, it is characterized in that: be connected with steam supply pipe on the shaft seal steam chamber of this device upper end.
3, advantage and effect: the test of many times of carrying out through the inventor shows that this practical new technology has the following advantages:
The first, shaft seal steam can effectively be full of dynamic and static part gap, and good sealing effect prevents bleeding of outside air, can effectively keep and reduce steam turbine exhaust pressure;
The second, the utility model apparatus structure is reasonable, and is easy for installation, safe and reliable, and operation can maintain a long-term stability.
Four, description of drawings:
Fig. 1 is former steam turbine low pressure shaft seal sealing device structure figure;
Accompanying drawing 2 the utility model main structure schematic representation.
Five, embodiment:
Former steam turbine low pressure shaft seal seal arrangement as shown in Figure 1, shaft seal steam warp steam supply pipe 2 down enters shaft seal steam chamber 6, steam is flowed to the contactless boss sealing in both sides tooth 5 respectively by shaft seal steam chamber 6, inwardly the steam that flows enters vapour condenser through low pressure rotor 1 surface, outwards the steam that flows enters an axle envelope back-steam chamber 3 through low pressure rotor 1 surface, and the steam that enters axle envelope back-steam chamber 3 causes gland heater through return tube 4 down.Former seal arrangement shortcoming is below shaft seal steam and back-steam are arranged in, and the steam that infeeds can not be full of the whole annular space that needs sealing, steam can occur from bottom direct short-circuit phenomenon, and top does not have sealed steam, so sealing effect is bad.
The utility model main structure figure as shown in Figure 2, it mainly is to be connected with steam supply pipe 7 on the shaft seal steam chamber 6 of this device upper end.
The utility model divides upper and lower two-way to infeed steam feeding of low-pressure shaft seal in turbine chamber 6 respectively with the steam that is slightly larger than atmospheric pressure, contactless boss sealing tooth 5 is set respectively in the both sides of shaft seal steam chamber, sealed steam is flowed to the contactless boss sealing in both sides tooth 5 by shaft seal steam chamber 6, and sealed steam takes the dynamic and static clearance space of whole circle.Inwardly the steam that flows enters low pressure (LP) cylinder inside, together enters vapour condenser with turbine discharge; Outwards the vapor stream that flows causes gland heater to axle envelope back-steam chamber by lower pipeline.Shaft seal steam plays insulating effect as medium, finally reaches sealing effect.
By the enforcement of this practical new technology, adopt the upper and lower sealed steam that infeeds simultaneously, can make the sealed steam that infeeds be full of the whole annular space that needs sealing, significantly improve sealing effect, reduce steam turbine exhaust pressure.
Claims (1)
1, a kind of steam turbine low pressure shaft seal seal arrangement, this device includes low pressure rotor (1), steam supply pipe (2), axle envelope back-steam chamber (3), following return tube (4), contactless boss seal tooth (5) and shaft seal steam chamber (6) down, it is characterized in that: be connected with steam supply pipe (7) on the shaft seal steam chamber (6) of this device upper end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202203123U CN201292865Y (en) | 2008-12-04 | 2008-12-04 | Low-pressure shaft seal sealing device for steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202203123U CN201292865Y (en) | 2008-12-04 | 2008-12-04 | Low-pressure shaft seal sealing device for steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201292865Y true CN201292865Y (en) | 2009-08-19 |
Family
ID=41006342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202203123U Expired - Lifetime CN201292865Y (en) | 2008-12-04 | 2008-12-04 | Low-pressure shaft seal sealing device for steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201292865Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277157A (en) * | 2013-05-24 | 2013-09-04 | 成都昊特新能源技术股份有限公司 | Solar ORC power generation system and power generation method thereof |
| CN103375189A (en) * | 2012-04-13 | 2013-10-30 | 通用电气公司 | Shaft sealing system for steam turbines |
| CN104769226A (en) * | 2012-11-06 | 2015-07-08 | 三菱日立电力系统株式会社 | Seal structure for vapor turbine |
| US9540942B2 (en) | 2012-04-13 | 2017-01-10 | General Electric Company | Shaft sealing system for steam turbines |
| CN109236382A (en) * | 2018-09-11 | 2019-01-18 | 大唐淮北发电厂 | A kind of encapsulating method at turbine shaft seal and its lp outer casing cylinder face |
-
2008
- 2008-12-04 CN CNU2008202203123U patent/CN201292865Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103375189A (en) * | 2012-04-13 | 2013-10-30 | 通用电气公司 | Shaft sealing system for steam turbines |
| CN103375189B (en) * | 2012-04-13 | 2016-03-16 | 通用电气公司 | For the axle sealing system of steamturbine |
| US9540942B2 (en) | 2012-04-13 | 2017-01-10 | General Electric Company | Shaft sealing system for steam turbines |
| CN104769226A (en) * | 2012-11-06 | 2015-07-08 | 三菱日立电力系统株式会社 | Seal structure for vapor turbine |
| US9677411B2 (en) | 2012-11-06 | 2017-06-13 | Mitsubishi Hitachi Power Systems, Ltd. | Sealing structure for steam turbine |
| CN103277157A (en) * | 2013-05-24 | 2013-09-04 | 成都昊特新能源技术股份有限公司 | Solar ORC power generation system and power generation method thereof |
| CN109236382A (en) * | 2018-09-11 | 2019-01-18 | 大唐淮北发电厂 | A kind of encapsulating method at turbine shaft seal and its lp outer casing cylinder face |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: LIAONING DONGKE ELECTRIC POWER CO., LTD. Free format text: FORMER OWNER: NORTHEAST ELECTRIC POWER RESEARCH INSTITUTE CO., LTD. Effective date: 20111122 Free format text: FORMER OWNER: LIAONING DONGKE ELECTRIC POWER CO., LTD. |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 110006 SHENYANG, LIAONING PROVINCE TO: 110179 SHENYANG, LIAONING PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20111122 Address after: Hunnan New Fruit street Shenyang city Liaoning province 110179 No. 3-1 Patentee after: Liaoning Dongke Power Co., Ltd. Address before: Heping District, Siping City of Shenyang province Liaoning 110006 Street No. 39 Co-patentee before: Liaoning Dongke Power Co., Ltd. Patentee before: Northeast Electric Power Research Institute Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20090819 |
|
| CX01 | Expiry of patent term |