Patent US4859142A successfully refreshed from Google Patents.
US4859142A
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Turbine clearance control duct arrangement
Assignee: RTX Corp
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Filing: 1988-02-01
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Granted: 1989-08-22
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Expires: 2008-02-01
Abstract
Abstract The cooling air duct for a clearance control system has spacers which abut the surface to be cooled. Critical spacing for proper cooling is obtained and is easily inspected. Ajustable supports facilitate adjustment.
Inventors
- 👤 William F. Burke
- 👤 Daniel E. Kane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:14
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/08; F01D11/14; F01D11/20; F01D11/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
A clearance control cooling air duct arrangement for a gas turbine comprising: a turbine casing; a plurality of circumferential flange structures joining sections of said turbine casing; a plurality of cooling air ducts circumferentially surrounding said casing adjacent to said flange structures; supply means for supplying cooling air to said ducts; multiplicity of holes in each of said ducts directing impingement cooling air against a flange and against the casing adjacent to the flange; a plurality of radial spacer members secured to each duct extending radially toward said casing; a plurality of axial spacer members secured to each duct extending axially toward a flange; a plurality of support brackets secured to each flange; and support means for adjustably securing said ducts to said brackets, with said spacer members in contact with said casing and one of said flange structures.
Claim 2
Dependent Claim
139 words
A clearance control cooling air duct arrangement for a gas turbine comprising: a turbine casing; a plurality of circumferential flange structures joining sections of said turbine casing; a plurality of cooling air ducts circumferentially surrounding said casing adjacent to said flange structures; supply means for supplying cooling air to said ducts; multiplicity of holes in each of said ducts directing impingement cooling air against a flange and against the casing adjacent to the flange; a plurality of radial spacer members secured to each duct extending radially toward said casing; a plurality of axial spacer members secured to each duct extending axially toward a flange; a plurality of support brackets secured to each flange; and support means for adjustably securing said ducts to said brackets, with said spacer members in contact with said casing and one of said flange structures.
Claim 3
Dependent Claim
63 words
An arrangement as in claim 1: said flange structures each including a plurality of bolts, extending through the flanges having a head side and an axially extending threaded side; and said plurality of axial spacer members located on the threaded bolt side of the flange in contact with each flange structure being of sufficient length to maintain said duct free of said bolts.
Claim 4
Dependent Claim
21 words
An arrangement as in claim 2: said brackets secured to the extending threaded side of said bolts extending through the flanges.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |