US3781128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal compressor diffuser
Assignee: Motors Liquidation Co
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Filing: 1971-10-12
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Granted: 1973-12-25
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Expires: 1991-10-12
Abstract
Abstract The diffuser of a centrifugal compressor having an unshrouded rotor has boundary layer fences on the walls bounding the diffuser in advance of the diffuser vanes. These vanes are directed across the direction of flow of boundary layer air on the diffuser wall and curve into the direction of the diffuser vanes as they merge with the leading edge of the vanes.
Inventors
- 👤 P Bandukwalla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:32
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/441; F04D29/444; F05; F05D; F05D2240/00; F05D2240/10; F05D2240/12; F05D2240/121; F05D2250/00; F05D2250/50; F05D2250/52; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
197 words
A centrifugal compressor comprising, in combination, a rotor including a disk having a generally radial face defining one boundary of the flow path through the rotor and blades extending axially of the rotor from one face of the disk and the flow from the rotor being substantially tangentially therefrom, a stator defining the other boundary of the flow path through the rotor, and a diffuser having two generally radial stationary walls providing continuations of the said boundaries, the diffuser including vanes bridging the space between the said walls and spaced radially from the rotor blades by a vaneless space, the diffuser being characterized by boundary layer fences extending from both of said walls into the diffuser, each said fence having an end nearest the rotor disposed across the direction of boundary layer flow from tbe rotor along the said one wall, and each fence curving gradually into a terminal portion fairing into the leading edge of one of said vanes; the fences on the wall continuing the disk boundary having initial portions trending primarily radially and the fences on the wall continuing the stator boundary having initial portions trending primarily tangentially with Respect to the rotor axis.
Claim 2
Dependent Claim
197 words
A centrifugal compressor comprising, in combination, a rotor including a disk having a generally radial face defining one boundary of the flow path through the rotor and blades extending axially of the rotor from one face of the disk and the flow from the rotor being substantially tangentially therefrom, a stator defining the other boundary of the flow path through the rotor, and a diffuser having two generally radial stationary walls providing continuations of the said boundaries, the diffuser including vanes bridging the space between the said walls and spaced radially from the rotor blades by a vaneless space, the diffuser being characterized by boundary layer fences extending from both of said walls into the diffuser, each said fence having an end nearest the rotor disposed across the direction of boundary layer flow from tbe rotor along the said one wall, and each fence curving gradually into a terminal portion fairing into the leading edge of one of said vanes; the fences on the wall continuing the disk boundary having initial portions trending primarily radially and the fences on the wall continuing the stator boundary having initial portions trending primarily tangentially with Respect to the rotor axis.
Claim 3
Dependent Claim
235 words
A centrifugal compressor comprising, in combination, a rotor including a disk having a generally radial face defining one boundary of the flow path through the rotor and blades extending axially of the rotor from one face of the disk and the flow from the rotor being substantially tangentially therefrom, a stator defining the other boundary of the flow path through the rotor, and a diffuser having two generally radial stationary walls providing continuations of the said boundaries, the diffuser including vanes bridging the space between the said walls and spaced radially from the rotor blades by a vaneless space, the diffuser being characterized by boundary layer fences extending from both of said walls into the diffuser, each said fence having an end nearest the rotor disposed across the direction of boundary layer flow from the rotor along the said one wall, and each fence curving gradually into a terminal portion fairing into the leading edge of one of said vanes; the fences on the wall continuing the disk boundary having initial portions beginning near the rotor trending primarily radially from the rotor and having a concave curvature into the vanes as viewed from the rotor; and the fences on the wall continuing the stator boundary beginning farther from the rotor and having initial portions trending primarily tangentially with respect to the rotor and having a convex curvature into the vanes as viewed from the rotor.
Claim 4
Dependent Claim
235 words
A centrifugal compressor comprising, in combination, a rotor including a disk having a generally radial face defining one boundary of the flow path through the rotor and blades extending axially of the rotor from one face of the disk and the flow from the rotor being substantially tangentially therefrom, a stator defining the other boundary of the flow path through the rotor, and a diffuser having two generally radial stationary walls providing continuations of the said boundaries, the diffuser including vanes bridging the space between the said walls and spaced radially from the rotor blades by a vaneless space, the diffuser being characterized by boundary layer fences extending from both of said walls into the diffuser, each said fence having an end nearest the rotor disposed across the direction of boundary layer flow from the rotor along the said one wall, and each fence curving gradually into a terminal portion fairing into the leading edge of one of said vanes; the fences on the wall continuing the disk boundary having initial portions beginning near the rotor trending primarily radially from the rotor and having a concave curvature into the vanes as viewed from the rotor; and the fences on the wall continuing the stator boundary beginning farther from the rotor and having initial portions trending primarily tangentially with respect to the rotor and having a convex curvature into the vanes as viewed from the rotor.
Claim 5
Dependent Claim
196 words
A centrifugal compressor comprising, in combination, a rotor including a disk having a generally radial face defining one boundary of the flow path through the rotor and blades extending axially of the rotor from one face of the disk and the flow from the rotor being substantially tangentially therefrom, means defining the other boundary of the flow path through the rotor, and a diffuser having two generally radial stationary walls providing continuations of the said boundaries, the diffuser including vanes bridging the space between the said walls and spaced radially from the rotor blades by a vaneless space and extending substantially tangential relative to the periphery of the rotor, the diffuser being characterized by boundary layer fences extending into the diffuser from the wall continuing the disk boundary, each said fence having an end near to the rotor and an initial portion trending primarily radially from the rotor from the said end across the direction of boundary layer flow from the rotor along the said wall, and each fence curving gradually into a terminal portion fairing into the leading edge of one of said vanes with a curvature which is concave as viewed from the rotor.
Claim 6
Dependent Claim
196 words
A centrifugal compressor comprising, in combination, a rotor including a disk having a generally radial face defining one boundary of the flow path through the rotor and blades extending axially of the rotor from one face of the disk and the flow from the rotor being substantially tangentially therefrom, means defining the other boundary of the flow path through the rotor, and a diffuser having two generally radial stationary walls providing continuations of the said boundaries, the diffuser including vanes bridging the space between the said walls and spaced radially from the rotor blades by a vaneless space and extending substantially tangential relative to the periphery of the rotor, the diffuser being characterized by boundary layer fences extending into the diffuser from the wall continuing the disk boundary, each said fence having an end near to the rotor and an initial portion trending primarily radially from the rotor from the said end across the direction of boundary layer flow from the rotor along the said wall, and each fence curving gradually into a terminal portion fairing into the leading edge of one of said vanes with a curvature which is concave as viewed from the rotor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |