CN202510172U - Device for controlling blade top clearance leakage and reducing steam flow exited vibration - Google Patents
Device for controlling blade top clearance leakage and reducing steam flow exited vibration Download PDFInfo
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- CN202510172U CN202510172U CN2012201399212U CN201220139921U CN202510172U CN 202510172 U CN202510172 U CN 202510172U CN 2012201399212 U CN2012201399212 U CN 2012201399212U CN 201220139921 U CN201220139921 U CN 201220139921U CN 202510172 U CN202510172 U CN 202510172U
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- annular groove
- block ring
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- steam
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Abstract
The utility model discloses a device for controlling the blade top clearance leakage and reducing the steam flow exited vibration. The device comprises a blade top shroud ring and a support shell which is fixed on the internal surface of an air cylinder, and is characterized in that: an annular groove is formed in the support shell, a fluid consumption cavity is formed in the annular groove, a flow-resistant disc is arranged on the blade top shroud ring, the outer end of the flow-resistant disc is positioned in the annular groove of the support shell, and a flow-resistant ring is arranged on the support shell, is positioned at the two sides of the flow-resistant disc, and is connected inside the annular groove through an elastic connecting part. The leaked steam in the device flows along the radial direction of a blade, so that the phenomenon of axial spiral flow is eliminated; and the steam flow directions of the two sides of the flow-resistant disc are opposite, so that the steam flow forces are offset and are weak. According to the device, the clearance between the flow-resistant ring and the flow-resistant disc is adjusted through introducing the pressurized steam into a regulation chamber, and is conveniently adjusted.
Description
Technical field
The utility model relates to a kind of device that is applied to steam turbine.This device can reduce the steam turbine blade tip clearance and leak and steam flow excitation power, improves steam turbine performance.
Background technique
Generally acknowledge both at home and abroad that at present the caused loss of refrigerant leakage is one of principal element that influences turbine efficiency in the blade tip clearance.Blade tip clearance leaks also can produce steam flow excitation power, brings out the steam flow excitation fault, has a strong impact on safe, stable, the reliable operation of unit.Along with steam turbine develops and modern society is energy-conservation to main equipment, improving constantly of reduce discharging requiring towards big capacity, high parameter direction, reduce that the steam turbine blade tip clearance leaks and the steam flow excitation power of bringing out just seems more and more important.
At present, the major measure that reduces tip leakage both at home and abroad comprises 2 aspects: the design of (1) leaf top improved shape.For the blade that contains shroud, change leaf top girth band external surface shape into non-smooth shape by smooth shape, as: recessing increases leakage flow resistance etc. on shroud; For the blade that does not contain shroud, change its outer surface of cupular part shape into cellular plane etc. by smooth flat.(2) cylinder face improves design.Modal method is between cylinder face and leaf top girth band, to arrange the interdigitated electrode structure sealing.Total trend is: the sealing number of teeth is more and more, and seal form becomes increasingly complex.In the last few years, some new technologies had also appearred, as: set up guide ring at cylinder face, adopt non-homogeneous gap design etc. between cylinder face and the blade tip.The major measure that reduces steam flow excitation power comprises 2 aspects: (1) reduces leaf top leakage rate.Leakage rate is little, and steam flow excitation power is also just little; (2) reduce the nonuniformity that leakage rate along the circumferential direction goes up, as: the off-centre of adjustment rotor in cylinder etc.
Blade tip clearance leaks above-mentioned technology and steam flow excitation power is effectively for reducing, but its effect depends on the size of blade tip clearance to a great extent.Blade tip clearance is more little, and effect is good more.For steam turbine, in order to prevent sound friction and accident such as issuable leaf destruction thus, tip clearance can not obtain very little.
Summary of the invention
To the problems referred to above, the utility model proposes a kind of new device that can reduce steam turbine tip leakage and steam flow excitation power.
The utility model solves the technological scheme that its technical problem adopted:
A kind of inhibition blade tip clearance leaks and reduces the steam flow excitation power apparatus; Comprise: leaf top girth band and be fixed on the supporting housing on the cylinder face; It is characterized in that: an annular groove is set in described supporting housing; In annular groove, be provided with fluid dissipation chamber, on leaf top girth band, be provided with the choked flow dish, the outer end of this choked flow dish is positioned at the annular groove of described supporting housing; On supporting housing, be provided with the both sides that block ring and block ring are positioned at the choked flow dish, described block ring is connected in the annular groove through a Flexible Connector.
Described block ring also have with the stressed plate of described annular groove parallel sided; Also be provided with a pressure regulating cavity chamber in described annular groove side; At the indoor logical pressure regulation gas of this pressure regulating cavity, it is indoor and in the distance between adjustment block ring and the choked flow dish under the effect of pressure regulation gas that the stressed plate of described block ring is arranged on described pressure regulating cavity.
Described Flexible Connector is an axle spring.
Described block ring also comprises the spring mounting plate, and the two ends of described axle spring are separately fixed on the side of spring mounting plate and annular groove.
The utility model device is provided with the choked flow dish on the blade tip shroud, in the both sides of choked flow dish block ring is set.Block ring links to each other with supporting housing through axle spring, and supporting housing is installed in cylinder face.Be designed with the pressure regulating cavity chamber between block ring and the supporting housing.Under the operating states of the units, regulate the gap between block ring and the choked flow dish to regulating in the chamber through introducing the pressure gas.
The concrete principle analysis of this device is following:
(1) combination of block ring and choked flow dish has increased the resistance in the gas leakage flow process, and the chamber inside vortex is more, and energy dissipation is big, has reduced the gas leakage rate;
(2) combination of block ring and choked flow dish has changed the direction of steam flow excitation power, and has reduced its active area to rotor, thereby can alleviate the steam flow excitation problem effectively;
(3) gap between block ring and the choked flow dish can gas pressure comes self adaption to regulate in the adjusting chamber through changing.
Compared with prior art, the beneficial effect that reduces leakage of blade tip clearance gas and steam flow excitation power apparatus that the utility model proposes is following:
(1) through the choked flow dish being set on the shroud and between choked flow dish and supporting housing, block ring being set, increased the resistance in the gas leakage process.Except conventional energy dissipation mechanism, increased the right-angled bend of a plurality of 90 degree on the utility model device escape of liquid path, can form a plurality of whirlpools in this process, energy dissipation is big, and it is obvious that turbulent flow increases the resistance effect, and leakage rate is also therefore and less.The result shows with hydrokinetics (CFD) software numerical simulation calculation, compares with traditional blade tip mounting broach formula seal arrangement, and the utility model device leakage rate has reduced 30%～50%.
(2) choked flow dish both sides gas leakage flow is in the opposite direction, and both sides steam flow excitation power can partial offset.In addition, steam flow excitation advocates to act on along axial direction, and radially the active area of steam flow power is also less.Therefore, steam flow excitation power can be very little.The CFD numerical simulation result shows, compares with traditional blade tip comb-shaped sealing, and the utility model device blade tip clearance excitation force significantly reduces.
(3) introduce the pressure gas after regulate chamber, the gap between block ring and choked flow dish self adaption is as required adjusted, and has avoided friction, and the gap can be adjusted to very little, thereby improve sealing effect greatly.
Description of drawings
Fig. 1 is the utility model apparatus structure schematic representation;
Fig. 2 is the utility model device partial structurtes schematic representation;
Fig. 3 is the utility model block ring structural representation;
Fig. 4 is that the utility model device and traditional blade tip comb-shaped seal arrangement blade tip clearance escape of liquid amount account for the main flow ratio with rotation speed change trend;
Fig. 5 is that the utility model device and traditional blade tip comb-shaped seal arrangement blade tip clearance flow losses are with rotation speed change trend.
Among Fig. 1, the 1st, supporting housing, the 2nd, annular groove, the 3rd, leaf top girth band, the 4th, block ring, the 5th, choked flow dish, the 6th, fluid dissipation chamber;
Among Fig. 2, the 1st, supporting housing, the 7th, pressure regulating cavity chamber, the 8th, spring, the 9th, pressure regulator valve door, the 10th, stressed plate, the 11st, spring mounting plate;
Among Fig. 3, the 10th, stressed plate, the 11st, spring mounting plate.
Embodiment
A kind of inhibition blade tip clearance leaks and reduces the steam flow excitation power apparatus; Comprise: leaf top girth band 3 and be fixed on the supporting housing 1 on the cylinder face; One annular groove 2 is set in the supporting housing 1; In supporting housing 1, be provided with fluid dissipation chamber 6, on leaf top girth band 3, be provided with choked flow dish 5, in annular groove 2, be provided with the both sides that block ring 4 and block ring 4 are positioned at choked flow dish 5.Block ring 4 is provided with the stressed plate 10 with annular groove 2 parallel sided; Stressed plate 10 forms pressure regulating cavity chamber 7 with annular groove 2 sides; Introduce gas in pressure regulating cavity chamber 7 through pressure regulator valve door 9; And acting on the stressed plate 10, thereby the distance between adjustment block ring 4 and the choked flow dish 5.Constitute fluid dissipation chamber 6 between choked flow dish 5 and the block ring 4.Also be provided with spring mounting plate 11 on the block ring 4.Axle spring 8 two ends are separately fixed on the side of spring mounting plate 11 and annular groove 2.
As shown in Figure 1, on leaf top girth band, designed the choked flow dish, block ring has been designed in choked flow dish both sides.The combination of choked flow dish/block ring can effectively reduce steam turbine tip leakage amount, and can significantly reduce steam flow excitation power, reaches the synergy effectiveness in vibration suppression.
As shown in Figure 2, under the choked flow dish intercepted, gas leaked mainly and flows along blade radial in the utility model device.Owing to hindered, there is not leak fluid helical flow phenomenon in the gas leakage process by the choked flow dish.Choked flow dish both sides fluid flow direction is opposite, and both sides steam flow power can partial offset.Thus, can eliminate the main source of steam flow excitation power, the steam flow excitation power in the new equipment can be very little.Fig. 3 is the block ring structure, and the indoor gas pressure of pressure regulating cavity is through acting on the distance that can adjust on the stressed plate between block ring and the choked flow dish.
Fig. 4 has provided the utility model device and the interior gas leakage rate of traditional blade tip comb-shaped seal arrangement accounts for the main flow ratio with rotation speed change trend; Fig. 5 has provided the utility model device and traditional blade tip comb-shaped seal arrangement internal clearance flow losses with rotation speed change trend.Can find out: compare with traditional blade tip comb-shaped sealing, the utility model device leakage rate obviously reduces, owing to leaking also corresponding the reducing of flow losses that brings.
Table 1 has provided the utility model device and traditional blade tip comb-shaped seal arrangement steam flow excitation force rate.
Table 1
| ? | Excitation force/N radially | Tangential excitation force/N |
| Conventional apparatus | 1658 | -2739 |
| The utility model device | 299 | -139 |
Can find out: compare with traditional blade tip comb-shaped sealing, steam flow excitation power declines to a great extent in the utility model device, and the anti-steam flow excitation ability of the utility model device is stronger.
Claims (4)
1. one kind is suppressed the blade tip clearance leakage and reduces the steam flow excitation power apparatus; Comprise: leaf top girth band (3) and be fixed on the supporting housing (1) on the cylinder face; It is characterized in that: an annular groove (2) is set in described supporting housing (1); In supporting housing (1), be provided with fluid dissipation chamber (6), on leaf top girth band (3), be 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 housing (1); On supporting housing (1), be provided with the both sides that block ring (4) and block ring (4) are positioned at choked flow dish (5), described block ring (4) is connected in the annular groove (2) through a Flexible Connector.
2. inhibition blade tip clearance according to claim 1 leaks and reduces the steam flow excitation power apparatus; It is characterized in that: described block ring (4) also have with the stressed plate (10) of described annular groove (2) parallel sided; Also be provided with a pressure regulating cavity chamber (7) in described annular groove (2) side; Logical pressure regulation gas in this pressure regulating cavity chamber (7), the stressed plate (10) of described block ring (4) are arranged in the described pressure regulating cavity chamber (7) and in the distance of adjusting the effect of pressure regulation gas under between block ring (4) and the choked flow dish (5).
3. inhibition blade tip clearance according to claim 2 leaks and reduces the steam flow excitation power apparatus, and it is characterized in that: described Flexible Connector is axle spring (8).
4. inhibition blade tip clearance according to claim 3 leaks and reduces the steam flow excitation power apparatus; It is characterized in that: described block ring also comprises spring mounting plate (11), and the two ends of described axle spring (8) are separately fixed on the side of spring mounting plate (11) and annular groove (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201399212U CN202510172U (en) | 2012-04-06 | 2012-04-06 | Device for controlling blade top clearance leakage and reducing steam flow exited vibration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201399212U CN202510172U (en) | 2012-04-06 | 2012-04-06 | Device for controlling blade top clearance leakage and reducing steam flow exited vibration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202510172U true CN202510172U (en) | 2012-10-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201399212U Expired - Fee Related CN202510172U (en) | 2012-04-06 | 2012-04-06 | Device for controlling blade top clearance leakage and reducing steam flow exited vibration |
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| Country | Link |
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| CN (1) | CN202510172U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102619577A (en) * | 2012-04-06 | 2012-08-01 | 东南大学 | Device for inhibiting clearance leakage of blade tip and reducing steam flow exciting force |
-
2012
- 2012-04-06 CN CN2012201399212U patent/CN202510172U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102619577A (en) * | 2012-04-06 | 2012-08-01 | 东南大学 | Device for inhibiting clearance leakage of blade tip and reducing steam flow exciting force |
| CN102619577B (en) * | 2012-04-06 | 2015-06-10 | 东南大学 | Device for inhibiting clearance leakage of blade tip and reducing steam flow exciting force |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121031 Termination date: 20130406 |