CN112160799A - Steam blocking structure and device - Google Patents
Steam blocking structure and device Download PDFInfo
- Publication number
- CN112160799A CN112160799A CN202011033945.5A CN202011033945A CN112160799A CN 112160799 A CN112160799 A CN 112160799A CN 202011033945 A CN202011033945 A CN 202011033945A CN 112160799 A CN112160799 A CN 112160799A
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- CN
- China
- Prior art keywords
- air
- box
- transmission shaft
- gas
- vapor barrier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000000903 blocking effect Effects 0.000 title abstract description 15
- 230000005540 biological transmission Effects 0.000 claims abstract description 45
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 238000007664 blowing Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 230000004888 barrier function Effects 0.000 claims 13
- 239000004519 grease Substances 0.000 abstract description 3
- 230000001050 lubricating effect Effects 0.000 abstract description 3
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 239000010687 lubricating oil Substances 0.000 description 4
- 230000009466 transformation Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention provides a steam blocking structure and a steam blocking device, wherein the steam blocking structure comprises a gas box arranged between an impeller chamber and a speed reducer/generator, the middle part of the gas box is provided with a round hole for a transmission shaft to pass through, the round hole is in close fit with the transmission shaft in a spaced manner, and the gas box is circumferentially provided with an exhaust pipe. In the scheme, the steam changes the injection path and is diffused outwards along the radial direction of the transmission shaft through the air box, the high-pressure annular air curtain is damaged, and the steam is prevented from reaching the bearing of the speed reducer/generator. The other scheme is as follows: a steam blocking device comprises a blowing device arranged between an impeller cabin and a speed reducer/generator, wherein the blowing device blows high-pressure airflow to a transmission shaft along the circumferential direction of the transmission shaft to form an annular air wall. In the scheme, the air wall is formed through the air blowing device, the air wall can not reach the bearing of the speed reducer/generator under the blocking of the air wall, and the high-pressure annular air curtain is damaged, so that the lubricating grease is prevented from being corroded by steam.
Description
Technical Field
The invention relates to the field of shaft sealing of a steam turbine, in particular to a steam blocking device between a steam turbine impeller and a speed reducer/generator of the steam turbine impeller.
Background
The steam turbine is a rotary steam power device, high-temperature and high-pressure steam forms accelerated airflow and is sprayed onto an impeller in an impeller bin, and a rotating shaft of the impeller is connected with a speed reducer/generator outside the impeller bin through a transmission shaft so as to apply work to the outside.
In the prior art, a transmission shaft is connected with an impeller inside an impeller cabin and a speed reducer/generator outside the impeller cabin, high-temperature and high-pressure water vapor in the impeller cabin is easy to spray and leak from a shaft seal position of the transmission shaft and the impeller cabin in a high-pressure annular air curtain mode, and then is blown to a bearing position between the speed reducer/generator and the transmission shaft along the axial direction of the transmission shaft, so that the water vapor can invade into a bearing box and a lubricating oil box to cause lubricating oil emulsification, oil pumping equipment is damaged, lubricating oil needs to be frequently replaced, and the maintenance cost is high.
Disclosure of Invention
The invention aims to provide a steam blocking structure and a device, which prevent steam leaked from an impeller cabin from invading a bearing box and a lubricating oil box of a transmission device.
In order to achieve the purpose, the invention adopts the following technical scheme: a steam blocking structure comprises a gas box arranged between an impeller bin and a speed reducer/generator, wherein a round hole for a transmission shaft to pass through is formed in the middle of the gas box, the round hole is in close fit with the transmission shaft in a spaced mode, and an exhaust pipe is arranged on the circumferential direction of the gas box.
In the scheme, the steam changes the injection path and is diffused outwards along the radial direction of the transmission shaft through the air box, the high-pressure annular air curtain is damaged, and the steam is prevented from reaching the bearing of the speed reducer/generator.
The other scheme is as follows: a steam blocking device comprises a blowing device arranged between an impeller cabin and a speed reducer/generator, wherein the blowing device blows high-pressure airflow to a transmission shaft along the circumferential direction of the transmission shaft to form an annular air wall.
In the scheme, the air wall is formed through the air blowing device, the air wall can not reach the bearing of the speed reducer/generator under the blocking of the air wall, and the high-pressure annular air curtain is damaged, so that the lubricating grease is prevented from being corroded by steam.
Drawings
FIG. 1 is a schematic structural view of the gas cell halves;
FIG. 2 is a schematic perspective view of the present invention;
fig. 3 is a schematic structural diagram of the present invention.
Detailed Description
A steam blocking structure comprises a gas box 10 arranged between an impeller bin and a speed reducer/generator, wherein a round hole 11 for a transmission shaft to pass through is formed in the middle of the gas box 10, the round hole 11 is in spaced close fit with the transmission shaft, and an exhaust pipe 30 is arranged on the gas box 10 in the circumferential direction.
When the steam leaked from the shaft seal of the impeller chamber reaches the air box 10 along the axial direction of the transmission shaft, part of the steam enters the air box from the gap between the air box 10 and the transmission shaft, the flow speed is accelerated when the air flow reaches the gap, the flow speed is slowed down after the air flow leaves the gap and enters the air box 10, the steam can be diffused outwards along the radial direction of the transmission shaft, the high-pressure annular air curtain is damaged and then is discharged from the exhaust pipe 30, meanwhile, the temperature difference can be formed inside and outside the air box after the steam enters the air box 10, so that pressure difference is formed, and the steam is further discharged from the exhaust pipe 30 under the positive pressure in the. Preventing the vapor from reaching the bearings of the reducer/generator.
The circumference of the gas box 10 is at least provided with two gas pipes 20 communicated with a negative pressure gas source, and the suction direction of the gas pipes 20 is perpendicular to the hole core of the round hole 11. Further increasing the pressure difference between the inside and outside of the gas box, facilitating the discharge of the vapor after entering the gas box 20.
The lower end of the air box 10 is provided with a water outlet 12. Partial condensation of the vapor can occur after the vapor enters the vapor box 20, and the water outlet 12 facilitates the outflow of accumulated water.
The air box 10 is in a trapezoid shape with a large upper part and a small lower part, and the water outlet 12 is arranged at the upper bottom of the trapezoid. The trapezoidal bottom is convenient for water conservancy diversion, and the outlet 12 of seting up like this is less, avoids too big outlet 12 to make the gas leakage too big can not form the malleation in gas box 20 formation.
The size of the air box 10 in the axial direction of the transmission shaft is smaller than that in the radial direction of the transmission shaft, and the mounting plate 13 is arranged on the outer periphery of the air box 10. Namely, the gas box 10 is in a plate box shape, and the mounting plate 13 on the gas box is convenient to mount and fix.
The gas box 10 is a half structure formed by two symmetrical half bodies. This scheme just can be applicable to the transformation of existing steam turbine and install additional like this, and the turn-ups is swift.
A steam blocking device comprises a blowing device arranged between an impeller cabin and a speed reducer/generator, wherein the blowing device blows high-pressure airflow to a transmission shaft along the circumferential direction of the transmission shaft to form an annular air wall.
The air flow blown by the air blowing device in the scheme can be air, an air wall is formed in the circumferential direction of the transmission shaft through the air blowing device, steam leaked from the shaft seal of the impeller bin can be contacted with the air wall when blown out along the axial direction of the transmission shaft, the high-pressure annular air curtain is prevented from being damaged, the steam can not reach the bearing of the speed reducer/generator under the blocking of the air wall, and meanwhile, the air flow can also cool the steam to enable the steam to become liquid to flow down, so that lubricating grease is prevented from being corroded by the steam.
The air blowing device comprises an air box 10 communicated with positive pressure air flow, a round hole 11 for the transmission shaft to penetrate through is formed in the middle of the air box 10, and the plate surface on one side of the air box 10 is perpendicular to the hole core of the round hole 11. Thus, an air wall can be simply formed in the air box 10, and simultaneously, high-pressure air flow can be blown out from the gap between the round hole 11 and the transmission shaft to form an air mold on the shaft body of the transmission shaft, so that steam is further prevented from being blown to the speed reducer/generator along the axial direction of the transmission shaft
The size of the air box 10 in the axial direction of the transmission shaft is smaller than that in the radial direction of the transmission shaft, and the mounting plate 13 is arranged on the outer periphery of the air box 10. Namely, the air box 10 is in a plate box shape, so that an air wall is formed conveniently, and the mounting plate 13 on the air box is convenient to mount and fix.
The circumference of the air box 10 is at least provided with two air pipes 20 communicated with a positive pressure air source, and the blowing direction of the air pipes 20 is vertical to the hole core of the round hole 11. The air pipes 20 arranged in a plurality of groups prevent dead corners of the formed air wall.
The lower end of the air box 10 is provided with a water outlet 12. Facilitating the escape of condensed vapor from the drain 12 after entering the gas box 10.
The air box 10 is in a trapezoid shape with a large upper part and a small lower part, and the water outlet 12 is arranged at the upper bottom of the trapezoid. The trapezoidal bottom is convenient for water conservancy diversion, and the outlet 12 of seting up like this is less, avoids too big gas leakage to form the air wall around the transmission shaft for too big gas vent.
An exhaust pipe 30 is arranged at the upper part of the gas box 10. Vapor that enters the gas box 10 and is not condensed in time is vented through the vent tube 30.
The gas box 10 is a half structure formed by two symmetrical half bodies. This scheme just can be applicable to the transformation of existing steam turbine and install additional like this, and the turn-ups is swift.
The gas box 10 is a round box or a polygonal box. The air wall formed by the round box is more uniform, and the polygonal box is convenient to manufacture and install.
The gap between the round hole 11 and the transmission shaft is 2-3mm, and the air pressure of the blown air flow of the blowing device is 5-7 bar. The plugging effect is not good if the clearance is too large, the transmission shaft is easy to interfere if the clearance is too small, wherein the clearance is preferably 2mm, and the air pressure is preferably 6 bar.
Claims (16)
1. A vapor barrier structure characterized by: the air box comprises an air box (10) arranged between an impeller bin and a speed reducer/generator, wherein a round hole (11) for a transmission shaft to pass through is formed in the middle of the air box (10), the round hole (11) is close to and matched with the transmission shaft at intervals, and an exhaust pipe (30) is arranged on the air box (10) in the circumferential direction.
2. The vapor barrier structure of claim 1, wherein: the circumference of the air box (10) is at least provided with two air pipes (20) communicated with a negative pressure air source, and the air suction direction of the air pipes (20) is vertical to the hole core of the round hole (11).
3. The vapor-barrier structure according to claim 1 or 2, characterized in that: the lower end of the air box (10) is provided with a water outlet (12).
4. The vapor barrier structure of claim 3, wherein: the air box (10) is in a trapezoid shape with a large upper part and a small lower part, and the water outlet (12) is arranged at the upper bottom of the trapezoid.
5. The vapor-barrier structure according to claim 1 or 2, characterized in that: the size of the gas box (10) in the axial direction of the transmission shaft is smaller than that of the gas box in the radial direction of the transmission shaft, and a mounting plate (13) is arranged on the periphery of the gas box (10).
6. The vapor-barrier structure according to claim 1 or 2, characterized in that: the gas box (10) is of a half structure formed by two symmetrical half bodies.
7. A vapor barrier device, characterized by: the air blowing device blows high-pressure air flow to the impeller bin and the speed reducer/generator along the circumferential direction of the transmission shaft to form an annular air wall.
8. The vapor barrier device of claim 7, wherein: the air blowing device comprises an air box (10) communicated with positive pressure air flow, a round hole (11) for a transmission shaft to penetrate through is formed in the middle of the air box (10), and the surface of one side of the air box (10) is perpendicular to the hole core of the round hole (11).
9. The vapor barrier device of claim 8, wherein: the size of the gas box (10) in the axial direction of the transmission shaft is smaller than that of the gas box in the radial direction of the transmission shaft, and a mounting plate (13) is arranged on the periphery of the gas box (10).
10. The vapor barrier device of claim 8, wherein: the gas box (10) is provided with at least two gas pipes (20) communicated with the positive pressure gas source in the circumferential direction, and the blowing direction of the gas pipes (20) is perpendicular to the hole core of the round hole (11).
11. The vapor barrier device of claim 8, wherein: the lower end of the air box (10) is provided with a water outlet (12).
12. The vapor barrier device of claim 11, wherein: the air box (10) is in a trapezoid shape with a large upper part and a small lower part, and the water outlet (12) is arranged at the upper bottom of the trapezoid.
13. The vapor barrier device of claim 8, wherein: an exhaust pipe (30) is arranged at the upper part of the gas box (10).
14. The vapor barrier device of claim 8, wherein: the gas box (10) is of a half structure formed by two symmetrical half bodies.
15. The vapor barrier device of claim 8, wherein: the gas box (10) is a round box or a polygonal box.
16. The vapor barrier device of claim 8, wherein: the gap between the round hole (11) and the transmission shaft is 2-3mm, and the air pressure of the blown air flow of the blowing device is 5-7 bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011033945.5A CN112160799A (en) | 2020-09-27 | 2020-09-27 | Steam blocking structure and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011033945.5A CN112160799A (en) | 2020-09-27 | 2020-09-27 | Steam blocking structure and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112160799A true CN112160799A (en) | 2021-01-01 |
Family
ID=73860599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011033945.5A Pending CN112160799A (en) | 2020-09-27 | 2020-09-27 | Steam blocking structure and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112160799A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2477833Y (en) * | 2001-05-30 | 2002-02-20 | 石占山 | Extraction check device for turbo-set |
| CN201145039Y (en) * | 2007-11-23 | 2008-11-05 | 哈尔滨市通盛电力技术开发有限公司 | Complete contact gas seal oil block |
| KR20130061781A (en) * | 2011-12-02 | 2013-06-12 | 강기선 | Steam turbine generator |
| CN203258075U (en) * | 2012-12-21 | 2013-10-30 | 尹波 | Dual-seal oil catch device |
| CN204804887U (en) * | 2015-05-27 | 2015-11-25 | 梁伟贤 | Airtight oil catch of steam turbine rotor shaft |
| CN207454037U (en) * | 2017-11-29 | 2018-06-05 | 郑州荣奇热电能源有限公司 | Steam turbine rotor shaft sealed oil catch structure |
| CN207454036U (en) * | 2017-11-29 | 2018-06-05 | 郑州荣奇热电能源有限公司 | Steam Turbine cylinder sream check device |
| CN210370814U (en) * | 2019-03-19 | 2020-04-21 | 华电电力科学研究院有限公司 | Bearing box airtight oil shield |
| CN210483825U (en) * | 2019-04-02 | 2020-05-08 | 华电电力科学研究院有限公司 | Vacuum sealing oil baffle |
| CN214091973U (en) * | 2020-09-27 | 2021-08-31 | 铜陵有色金属集团股份有限公司 | Steam blocking structure |
-
2020
- 2020-09-27 CN CN202011033945.5A patent/CN112160799A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2477833Y (en) * | 2001-05-30 | 2002-02-20 | 石占山 | Extraction check device for turbo-set |
| CN201145039Y (en) * | 2007-11-23 | 2008-11-05 | 哈尔滨市通盛电力技术开发有限公司 | Complete contact gas seal oil block |
| KR20130061781A (en) * | 2011-12-02 | 2013-06-12 | 강기선 | Steam turbine generator |
| CN203258075U (en) * | 2012-12-21 | 2013-10-30 | 尹波 | Dual-seal oil catch device |
| CN204804887U (en) * | 2015-05-27 | 2015-11-25 | 梁伟贤 | Airtight oil catch of steam turbine rotor shaft |
| CN207454037U (en) * | 2017-11-29 | 2018-06-05 | 郑州荣奇热电能源有限公司 | Steam turbine rotor shaft sealed oil catch structure |
| CN207454036U (en) * | 2017-11-29 | 2018-06-05 | 郑州荣奇热电能源有限公司 | Steam Turbine cylinder sream check device |
| CN210370814U (en) * | 2019-03-19 | 2020-04-21 | 华电电力科学研究院有限公司 | Bearing box airtight oil shield |
| CN210483825U (en) * | 2019-04-02 | 2020-05-08 | 华电电力科学研究院有限公司 | Vacuum sealing oil baffle |
| CN214091973U (en) * | 2020-09-27 | 2021-08-31 | 铜陵有色金属集团股份有限公司 | Steam blocking structure |
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