CN102619577B - Device for inhibiting clearance leakage of blade tip and reducing steam flow exciting force - Google Patents
Device for inhibiting clearance leakage of blade tip and reducing steam flow exciting force Download PDFInfo
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- CN102619577B CN102619577B CN201210097838.8A CN201210097838A CN102619577B CN 102619577 B CN102619577 B CN 102619577B CN 201210097838 A CN201210097838 A CN 201210097838A CN 102619577 B CN102619577 B CN 102619577B
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- annular groove
- block ring
- blade tip
- choked flow
- steam flow
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Abstract
The invention discloses a device for inhibiting the clearance leakage of a blade tip and reducing the steam flow exciting force. The device comprises a blade tip shroud and a supporting casing fixed on the inner surface of an air cylinder. The device is characterized in that an annular groove is formed in the supporting casing; a fluid dissipating chamber is arranged in the annular groove; a choke plate is arranged on the blade tip shroud; the outer end of the choke plate is positioned in the annular groove of the supporting casing; choke rings are arranged on the supporting casing and are respectively positioned at two sides of the choke plate; and the choke ring is connected in the annular groove through an elastic connecting member. According to the device disclosed by the invention, leakage gas in the device flows along the radial direction of a blade and the axial spiral flowing phenomenon is eliminated; and the flowing directions of gas on two sides of the choke plate are opposite, and thus the steam flow force is partially offset and is smaller. According to the device disclosed by the invention, pressure gas is introduced into the clearance between an adjusting choke ring in an adjusting chamber and the choke plate, and thus the clearance is conveniently adjusted.
Description
Technical field
The present invention relates to a kind of device being applied to steam turbine.This device can reduce steam turbine clearance leakage of blade tip and Steam excited force, improves steam turbine performance.
Background technique
Generally acknowledge both at home and abroad at present, the loss in blade tip clearance caused by refrigerant leakage is one of principal element affecting turbine efficiency.Clearance leakage of blade tip also can produce Steam excited force, brings out steam flow excitation fault, has a strong impact on safe, stable, the reliable operation of unit.Along with steam turbine is towards Large Copacity, high parameter future development and modern society is energy-conservation to main equipment, reduce discharging improving constantly of requiring, reduce steam turbine clearance leakage of blade tip and the Steam excited force that brings out just seems more and more important.
At present, the major measure reducing tip leakage both at home and abroad comprises 2 aspects: (1) squealer tip Curve guide impeller.For the blade containing shroud, change leaf top girth band external surface shape into Non-smooth surface shape by smooth shape, as: on shroud, recessing increases leakage flow resistance etc.; For the blade not containing shroud, change its outer surface of cupular part shape into cellular plane etc. by smooth flat.(2) cylinder face Curve guide impeller.Modal method arranges that interdigitated electrode structure seals between cylinder face and leaf top girth band.Total trend is: the sealing number of teeth gets more and more, and seal form becomes increasingly complex.In the last few years, also there are some new technologies, as: set up guide ring at cylinder face, between cylinder face and blade tip, adopt non-uniform gap design etc.The major measure reducing Steam excited force comprises 2 aspects: (1) reduces leaf top leakage rate.Leakage rate is little, and Steam excited force is also just little; (2) nonuniformity that leakage rate along the circumferential direction goes up is reduced, as: the bias etc. of adjustment rotor in cylinder.
Above-mentioned technology is effective for reduction clearance leakage of blade tip and Steam excited force, but its effect depends on the size of blade tip clearance to a great extent.Blade tip clearance is less, and effect is better.For steam turbine, in order to prevent sound friction and the accident such as issuable leaf destruction thus, tip clearance can not obtain very little.
Summary of the invention
For the problems referred to above, the present invention proposes a kind of device that can reduce steam turbine tip leakage and Steam excited force newly.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of suppression clearance leakage of blade tip and reduction steam flow excitation power apparatus, comprise: leaf top girth band and the supporting outer be fixed on cylinder face, it is characterized in that: an annular groove is set in described supporting outer, fluid dissipation chamber is provided with in annular groove, leaf top girth band is provided with choked flow dish, the outer end of this choked flow dish is positioned at the annular groove of described supporting outer, supporting outer is provided with block ring and block ring is positioned at the both sides of choked flow dish, described block ring is connected in annular groove by a Flexible Connector.
Described block ring also has with the parallel stressed plate in the annular groove side with described, a pressure regulating cavity room is also provided with in described annular groove side, at this logical pressure regulation gas in pressure regulating cavity indoor, the stressed plate of described block ring is arranged on described pressure regulating cavity indoor and the distance adjusted under the effect of pressure regulation gas between block ring and choked flow dish.
Described Flexible Connector is axle spring.
Described block ring also comprises spring fitting plate, and the two ends of described axle spring are separately fixed on the side of spring fitting plate and annular groove.
Apparatus of the present invention arrange choked flow dish on blade tip shroud, arrange block ring in the both sides of choked flow dish.Block ring is connected with supporting outer by axle spring, and supporting outer is arranged on cylinder face.Pressure regulating cavity room is designed with between block ring and supporting outer.Under operating states of the units, by introducing pressure gas to regulating in chamber the gap regulated between block ring and choked flow dish.
The concrete principle analysis of this device is as follows:
(1) combination of block ring and choked flow dish adds the resistance in gas leakage flow process, and chamber inside vortex is more, and energy dissipation is large, decreases gas leakage rate;
(2) combination of block ring and choked flow dish changes the direction of Steam excited force, and reduces its active area to rotor, thus can effectively alleviate steam flow excitation problem;
(3) gap between block ring and choked flow dish can regulate gas pressure in chamber to carry out Automatic adjusument by changing.
Compared with prior art, the reduction blade tip clearance gas that the present invention proposes leak and the beneficial effect of steam flow excitation power apparatus as follows:
(1) by arranging choked flow dish and arrange block ring on shroud between choked flow dish and supporting outer, the resistance in gas leakage process is increased.Except conventional energy dissipation mechanism, apparatus of the present invention fluid leak path adds the right-angled bend of multiple 90 degree, can form multiple whirlpool in this process, energy dissipation is large, and turbulent flow increases resistance successful, and leakage rate is also therefore and comparatively little.Show by hydrokinetics (CFD) Software Numerical Simulation result of calculation, compared with traditional blade tip mounting broach formula seal arrangement, apparatus of the present invention leakage rate decreases 30% ~ 50%.
(2) direction of choked flow dish both sides gas leakage flow is contrary, and both sides Steam excited force can partial offset.In addition, Steam excited force acts predominantly in the axial direction, and the active area of radial steam flow power is also less.Therefore, Steam excited force can be very little.CFD numerical simulation result shows, compared with sealing with traditional blade tip comb-shaped, apparatus of the present invention blade tip clearance excitation force significantly reduces.
(3) introduce pressure gas to after regulating chamber, the gap between block ring and choked flow dish can self-adaptative adjustment as required, avoid friction, and gap can be adjusted to very little, thus greatly improve sealing effect.
Accompanying drawing explanation
Fig. 1 is apparatus of the present invention structural representations;
Fig. 2 is apparatus of the present invention partial structurtes schematic diagram;
Fig. 3 is block ring structural representation of the present invention;
Fig. 4 is that apparatus of the present invention and traditional blade tip comb-shaped seal arrangement blade tip clearance leakage amount of fluid account for mainstream ratios with rotation speed change trend;
Fig. 5 is that apparatus of the present invention and traditional blade tip comb-shaped seal arrangement blade tip clearance flow losses are with rotation speed change trend.
In Fig. 1,1 is supporting outer, and 2 is annular grooves, and 3 is leaf top girth bands, and 4 is block rings, and 5 is choked flow dishes, and 6 is fluid dissipation chambers;
In Fig. 2,1 is supporting outer, and 7 is pressure regulating cavity rooms, and 8 is springs, and 9 is pressure regulator valve doors, and 10 is stressed plates, and 11 is spring fitting plates;
In Fig. 3,10 is stressed plates, and 11 is spring fitting plates.
Embodiment
A kind of suppression clearance leakage of blade tip and reduction steam flow excitation power apparatus, comprise: leaf top girth band 3 and the supporting outer 1 be fixed on cylinder face, one annular groove 2 is set in supporting outer 1, fluid dissipation chamber 6 is provided with in supporting outer 1, leaf top girth band 3 is provided with choked flow dish 5, in annular groove 2, is provided with block ring 4 and block ring 4 is positioned at the both sides of choked flow dish 5.Block ring 4 is provided with the stressed plate 10 parallel with annular groove 2 side, stressed plate 10 and annular groove 2 side mineralization pressure regulate chamber 7, gas is introduced in pressure regulating cavity room 7 by pressure regulator valve door 9, and acting on stressed plate 10, thus the distance between adjustment block ring 4 and choked flow dish 5.Fluid dissipation chamber 6 is formed between choked flow dish 5 and block ring 4.Block ring 4 is also provided with spring fitting plate 11.Axle spring 8 two ends are separately fixed on the side of spring fitting plate 11 and annular groove 2.
As shown in Figure 1, leaf top girth band devises choked flow dish, choked flow dish both sides devise block ring.The combination of choked flow dish/block ring effectively can reduce steam turbine tip leakage amount, and significantly can reduce Steam excited force, reaches synergy effectiveness in vibration suppression.
As shown in Figure 2, under choked flow dish intercepts, in apparatus of the present invention, gas leaks and mainly flows along blade radial.Owing to being hindered by choked flow dish in gas leakage process, there is not leak fluid helical flow phenomenon.Choked flow dish both sides fluid flow direction is contrary, and both sides steam flow power can partial offset.Thus, can eliminate the main source of Steam excited force, the Steam excited force in new equipment can be very little.Fig. 3 is block ring structure, and the indoor gas pressure of pressure regulating cavity is by acting on the distance that stressed plate can adjust between block ring and choked flow dish.
Fig. 4 gives gas leakage rate in apparatus of the present invention and traditional blade tip comb-shaped seal arrangement and accounts for mainstream ratios with rotation speed change trend; Fig. 5 gives apparatus of the present invention and traditional blade tip comb-shaped seal arrangement internal clearance flow losses with rotation speed change trend.Can find out: compared with sealing with traditional blade tip comb-shaped, apparatus of the present invention leakage rate obviously reduces, and the flow losses brought due to leakage are corresponding reduction also.
Table 1 gives apparatus of the present invention and compares with traditional blade tip comb-shaped seal arrangement Steam excited force.
Table 1
| Radial excitation force/N | Tangential excitation force/N | |
| Conventional apparatus | 1658 | -2739 |
| Apparatus of the present invention | 299 | -139 |
Can find out: compared with sealing with traditional blade tip comb-shaped, in apparatus of the present invention, Steam excited force declines to a great extent, and apparatus of the present invention anti-steam flow excitation ability is stronger.
Claims (3)
1. one kind is suppressed clearance leakage of blade tip and reduces steam flow excitation power apparatus, comprise: leaf top girth band (3) and the supporting outer (1) be fixed on cylinder face, it is characterized in that: in described supporting outer (1), an annular groove (2) is set, fluid dissipation chamber (6) is provided with in supporting outer (1), fluid dissipation chamber (6) is formed between choked flow dish (5) and block ring (4), leaf top girth band (3) is provided with choked flow dish (5), the outer end of this choked flow dish (5) is positioned at the annular groove (2) of described supporting outer (1), supporting outer (1) is provided with block ring (4) and block ring (4) is positioned at the both sides of choked flow dish (5), described block ring (4) is connected in annular groove (2) by a Flexible Connector, described block ring (4) also has with the stressed plate (10) parallel with described annular groove (2) side, a pressure regulating cavity room (7) is also provided with in described annular groove (2) side, stressed plate (10) and annular groove (2) side mineralization pressure regulate chamber (7), gas is introduced in pressure regulating cavity room (7) by pressure regulator valve door (9), logical pressure regulation gas in this pressure regulating cavity room (7), the stressed plate (10) of described block ring (4) to be arranged in described pressure regulating cavity room (7) and the distance adjusted under the effect of pressure regulation gas between block ring (4) and choked flow dish (5).
2. suppression clearance leakage of blade tip according to claim 1 and reduction steam flow excitation power apparatus, is characterized in that: described Flexible Connector is axle spring (8).
3. suppression clearance leakage of blade tip according to claim 2 and reduction steam flow excitation power apparatus, it is characterized in that: described block ring also comprises spring fitting plate (11), the two ends of described axle spring (8) are separately fixed on the side of spring fitting plate (11) and annular groove (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210097838.8A CN102619577B (en) | 2012-04-06 | 2012-04-06 | Device for inhibiting clearance leakage of blade tip and reducing steam flow exciting force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210097838.8A CN102619577B (en) | 2012-04-06 | 2012-04-06 | Device for inhibiting clearance leakage of blade tip and reducing steam flow exciting force |
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| Publication Number | Publication Date |
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| CN102619577A CN102619577A (en) | 2012-08-01 |
| CN102619577B true CN102619577B (en) | 2015-06-10 |
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| CN201210097838.8A Expired - Fee Related CN102619577B (en) | 2012-04-06 | 2012-04-06 | Device for inhibiting clearance leakage of blade tip and reducing steam flow exciting force |
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Families Citing this family (5)
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| CN104074799B (en) * | 2013-11-17 | 2017-01-18 | 成都中科航空发动机有限公司 | Axial-flow compressor with expanding meridional channel and design method of axial-flow compressor |
| CN104847416A (en) * | 2015-04-09 | 2015-08-19 | 上海理工大学 | Impeller top surrounding band and turbine |
| CN105041389A (en) * | 2015-07-22 | 2015-11-11 | 东南大学 | Adjustable regulation stage of nozzles reducing remaining steam force and regulation method of regulation stage |
| CN106761959A (en) * | 2017-01-23 | 2017-05-31 | 上海理工大学 | For the jet-propelled comb gland seal structure of self-regulated of turbomachinery |
| JP6916755B2 (en) * | 2018-03-09 | 2021-08-11 | 三菱重工業株式会社 | Rotating machine |
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| JPS63280803A (en) * | 1987-05-12 | 1988-11-17 | Toshiba Corp | Thermal processing device for gap adjusting bellows |
| JPH07174001A (en) * | 1993-12-20 | 1995-07-11 | Toshiba Corp | Moving blade chip clearance controller |
| JPH1113404A (en) * | 1997-06-25 | 1999-01-19 | Mitsubishi Heavy Ind Ltd | Blade and sealing mechanism for moving blade |
| US6508624B2 (en) * | 2001-05-02 | 2003-01-21 | Siemens Automotive, Inc. | Turbomachine with double-faced rotor-shroud seal structure |
| CN101189411A (en) * | 2005-06-08 | 2008-05-28 | 西门子公司 | Gas turbine with a gap blocking device |
| CN101776148A (en) * | 2010-03-19 | 2010-07-14 | 东南大学 | Radial ring seal |
| CN201554503U (en) * | 2009-12-17 | 2010-08-18 | 北京蓝爱迪电力技术有限公司 | Double-way self-adjusting gland sealing |
| CN101876259A (en) * | 2009-05-01 | 2010-11-03 | 株式会社日立制作所 | Sealing configuration and controlling method thereof |
| CN102207198A (en) * | 2011-04-11 | 2011-10-05 | 东南大学 | Radial annular mixed seal |
| CN202510172U (en) * | 2012-04-06 | 2012-10-31 | 东南大学 | Device for controlling blade top clearance leakage and reducing steam flow exited vibration |
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2012
- 2012-04-06 CN CN201210097838.8A patent/CN102619577B/en not_active Expired - Fee Related
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63280803A (en) * | 1987-05-12 | 1988-11-17 | Toshiba Corp | Thermal processing device for gap adjusting bellows |
| JPH07174001A (en) * | 1993-12-20 | 1995-07-11 | Toshiba Corp | Moving blade chip clearance controller |
| JPH1113404A (en) * | 1997-06-25 | 1999-01-19 | Mitsubishi Heavy Ind Ltd | Blade and sealing mechanism for moving blade |
| US6508624B2 (en) * | 2001-05-02 | 2003-01-21 | Siemens Automotive, Inc. | Turbomachine with double-faced rotor-shroud seal structure |
| CN101189411A (en) * | 2005-06-08 | 2008-05-28 | 西门子公司 | Gas turbine with a gap blocking device |
| CN101876259A (en) * | 2009-05-01 | 2010-11-03 | 株式会社日立制作所 | Sealing configuration and controlling method thereof |
| CN201554503U (en) * | 2009-12-17 | 2010-08-18 | 北京蓝爱迪电力技术有限公司 | Double-way self-adjusting gland sealing |
| CN101776148A (en) * | 2010-03-19 | 2010-07-14 | 东南大学 | Radial ring seal |
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| CN102619577A (en) | 2012-08-01 |
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