US4534701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor or guide wheel of a turbine engine with shroud ring
Assignee: Individual
•
Filing: 1983-06-28
•
Granted: 1985-08-13
•
Expires: 2003-06-28
Abstract
Abstract In rotors and guide wheels of a turbine engine which are equipped with a shroud ring, at least one opening (26, 28) is provided in the shroud ring (12) in the vicinity of the compression side (A) of each turbine blade (10) in accordance with the invention, in order to reduce gap and peripheral losses. As a result of the prevailing pressure difference, a portion of the flow medium is blown out of the blade channel through these openings into the chamber (22) formed between the sealing combs (16, 18) of the labyrinth seal; this portion would otherwise result in the known problem of peripheral losses in the blade channel. The pressure compensation thus attained between the space preceding the cascade and the chamber (22) blocks off the leakage flow about the outer rim of the shroud ring (12) and thereby precludes the known problem of gap losses as well.
Inventors
- 👤 Gerhard Wisser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:17
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/08; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
183 words
In a rotor or guide wheel of a turbine engine having a turbine blade equipped with a shroud ring, wherein the engine has a labyrinth seal including at least two sealing combs (16,18) cooperating with the blade and forming three chambers, the first of which (20) is on the upstream compression side of the blade, the second of which (24) is on the downstream side of the blade, and the third of which (22) is intermediate the first and second chambers, the improvement which comprises at least one opening (26) provided in the shroud ring (12) in the vicinity of the upstream compression side (A) of each turbine blade (10) in a region defining a source of secondary leakage flow in which the pressure drop between the blade channel and the third chamber is greatest, and substantially immediately beyond the first sealing comb (16) for connecting the blade channel with the third chamber 22 between the sealing combs (16,18) of the labyrinth seal, whereby the pressures before and after the sealing comb (16) are substantially equalized, thereby minimizing the peripheral and gap losses.
Claim 2
Dependent Claim
183 words
In a rotor or guide wheel of a turbine engine having a turbine blade equipped with a shroud ring, wherein the engine has a labyrinth seal including at least two sealing combs (16,18) cooperating with the blade and forming three chambers, the first of which (20) is on the upstream compression side of the blade, the second of which (24) is on the downstream side of the blade, and the third of which (22) is intermediate the first and second chambers, the improvement which comprises at least one opening (26) provided in the shroud ring (12) in the vicinity of the upstream compression side (A) of each turbine blade (10) in a region defining a source of secondary leakage flow in which the pressure drop between the blade channel and the third chamber is greatest, and substantially immediately beyond the first sealing comb (16) for connecting the blade channel with the third chamber 22 between the sealing combs (16,18) of the labyrinth seal, whereby the pressures before and after the sealing comb (16) are substantially equalized, thereby minimizing the peripheral and gap losses.
Claim 3
Dependent Claim
40 words
The improvement as defined by claim 1, characterized in that a number of small openings (28) is disposed in a grid pattern in the shroud ring (12) in the vicinity of the compression side (A) of each turbine blade (10).
Claim 4
Dependent Claim
25 words
The improvement as defined by claim 1, characterized in that the openings (26 or 28) in the shroud ring (12) extend in the radial direction.
Claim 5
Dependent Claim
40 words
The improvement as defined by claim 1, characterized in that guide vanes (30) are disposed on the forward edges of the openings (26), inclined toward the rear edges thereof, viewed in the direction of rotation of the turbine blades (10).
Claim 6
Dependent Claim
40 words
The improvement as defined by claim 1, characterized in that the openings (26,28) in the shroud ring (12) are inclined from the inside toward the outside in a direction counter to the direction of rotation of the turbine blades (10).
References Cited (Backward Citations)
US2291828A
Cited
US3846038A
Cited
SU408057A1
Cited
US3876330A
Cited
US3980411A
Cited
SU663861A1
Cited
JPS55146201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |