Patent US3893787A successfully refreshed from Google Patents.
US3893787A
Expired / Lapsed
US
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Centrifugal compressor boundary layer control
Assignee: RTX Corp
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Filing: 1974-03-14
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Granted: 1975-07-08
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Expires: 1994-03-14
Abstract
Abstract A centrifugal compressor is shown with an inlet directing a fluid thereto and a diffuser into which the compressor directs its output. A group or array of circumferential grooves are located in the surface of a stationary shroud which covers the blades of the compressor.
Inventors
- 👤 Burton A Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:26
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/66; F04D29/68; F04D29/681; F04D29/685; F04D29/08; F04D29/16; F04D29/161; F04D29/162; F04D29/40; F04D29/42; F04D29/4206; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
117 words
A centrifugal compressor being mounted for rotation having an axial inlet for delivering a fluid thereto, and a radial outlet for receiving a compressed fluid therefrom, said compressor having blades thereon each blade having a continuous outer free edge from said inlet to said outlet, said blades having an abrupt flow path section from axial flow to radial flow, a fixed shroud located between said inlet and outlet spaced from the edges of said blades, said shroud having annular grooves located therearound facing said blades, said circumferential grooves being located on the surface of the shroud opposite the abrupt flow path section where the flowpath from said inlet turns abruptly toward a radial direction into said outlet.
Claim 2
Dependent Claim
117 words
A centrifugal compressor being mounted for rotation having an axial inlet for delivering a fluid thereto, and a radial outlet for receiving a compressed fluid therefrom, said compressor having blades thereon each blade having a continuous outer free edge from said inlet to said outlet, said blades having an abrupt flow path section from axial flow to radial flow, a fixed shroud located between said inlet and outlet spaced from the edges of said blades, said shroud having annular grooves located therearound facing said blades, said circumferential grooves being located on the surface of the shroud opposite the abrupt flow path section where the flowpath from said inlet turns abruptly toward a radial direction into said outlet.
Claim 3
Dependent Claim
18 words
A combination as set forth in claim 1 wherein the number of grooves range from 4 to 8.
Claim 4
Dependent Claim
19 words
A combination as set forth in claim 1 wherein the grooves are spaced one-half of a groove width apart.
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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |