US3887295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compressor inlet control ring
Assignee: Motors Liquidation Co
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Filing: 1973-12-03
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Granted: 1975-06-03
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Expires: 1993-12-03
Abstract
Abstract A centrifugal compressor includes a stationary outer shroud and a centrifugal rotor with an inner hub wall located radially inwardly of the stationary shroud to define an axial inlet and a radial outlet. A plurality of centrifugal blades located on the hub wall define a plurality of circumferentially spaced flow passages for compression of working fluid drawn from the axial inlet for discharge through the radial outlet. Means are included at the inlet end of the stationary shroud to direct additional flow into the flow passages between each of the centrifugal blades on the rotor to relieve partial vacuum conditions existing between the stationary shroud wall and the rotor tips at the inlet end thereof to improve the rotor exit pressure and velocity gradient thereby to increase efficiency of a following diffuser located downstream of the radial outlet of the compressor.
Inventors
- 👤 Mason Kwok Yu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:23
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/66; F04D29/68; F04D29/681; F04D29/684; F04D27/00; F04D27/02; F04D27/0207; F04D27/0238; F04D29/40; F04D29/42; F04D29/4206; F04D29/4213
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
287 words
A centrifugal compressor comprising a stationary shroud with an inner wall having an axial inlet and a radial outlet, a continuously open inwardly converging inlet lip on said shroud fixedly connected with respect to said axial inlet to form a flow transition therebetween, a rotor including a hub adapted to be connected to a drive shaft, said hub including a hub wall having an axial inlet and a radial outlet a plurality of rotor blades supported on said hub wall including a radially outer tip and an axial leading edge and a radial trailing edge thereon, each of said rotor blades defining a flow passage therebetween bound by the inner wall of said stationary shroud and the hub wall and having a flow discontinuity negative pressure region at said tip from the axial leading edge through a part of the chamber length of said tip, a gap in the inner wall of said stationary shroud located circumferentially therearound at the flow transition between said inlet lip and said axial inlet, said gap being in communication with atmospheric pressure exteriorly of said stationary shroud and overlying the rotor blade tips immediately downstream of the leading edge of each of said rotor blades, an annular control ring movable with respect to said gap for regulating the communication between atmosphere and the inner wall of said stationary shroud to produce a controlled bleed of atmosphere to said negative pressure region to produce a uniform pressure and velocity gradient from the inlet to the outlet of each of the said flow passages with the total pressure and indicated air angle of compressed flow through the passages being uniform from the radial outlet of the shroud inner wall to the hub wall.
Claim 2
Dependent Claim
287 words
A centrifugal compressor comprising a stationary shroud with an inner wall having an axial inlet and a radial outlet, a continuously open inwardly converging inlet lip on said shroud fixedly connected with respect to said axial inlet to form a flow transition therebetween, a rotor including a hub adapted to be connected to a drive shaft, said hub including a hub wall having an axial inlet and a radial outlet a plurality of rotor blades supported on said hub wall including a radially outer tip and an axial leading edge and a radial trailing edge thereon, each of said rotor blades defining a flow passage therebetween bound by the inner wall of said stationary shroud and the hub wall and having a flow discontinuity negative pressure region at said tip from the axial leading edge through a part of the chamber length of said tip, a gap in the inner wall of said stationary shroud located circumferentially therearound at the flow transition between said inlet lip and said axial inlet, said gap being in communication with atmospheric pressure exteriorly of said stationary shroud and overlying the rotor blade tips immediately downstream of the leading edge of each of said rotor blades, an annular control ring movable with respect to said gap for regulating the communication between atmosphere and the inner wall of said stationary shroud to produce a controlled bleed of atmosphere to said negative pressure region to produce a uniform pressure and velocity gradient from the inlet to the outlet of each of the said flow passages with the total pressure and indicated air angle of compressed flow through the passages being uniform from the radial outlet of the shroud inner wall to the hub wall.
Claim 3
Dependent Claim
287 words
A centrifugal compressor comprising a stationary shroud with an inner wall having an axial inlet and a radial outlet, a continuously open inwardly converging inlet lip on said shroud fixedly connected with respect to said axial inlet to form a flow transition therebetween, a rotor including a hub adapted to be connected to a drive shaft, said hub including a hub wall having an axial inlet and a radial outlet a plurality of rotor blades supported on said hub wall including a radially outer tip and an axial leading edge and a radial trailing edge thereon, each of said rotor blades defining a flow passage therebetween bound by the inner wall of said stationary shroud and the hub wall and having a flow discontinuity negative pressure region at said tip from the axial leading edge through a part of the chamber length of said tip, a gap in the inner wall of said stationary shroud located circumferentially therearound at the flow transition between said inlet lip and said axial inlet, said gap being in communication with atmospheric pressure exteriorly of said stationary shroud and overlying the rotor blade tips immediately downstream of the leading edge of each of said rotor blades, an annular control ring movable with respect to said gap for regulating the communication between atmosphere and the inner wall of said stationary shroud to produce a controlled bleed of atmosphere to said negative pressure region to produce a uniform pressure and velocity gradient from the inlet to the outlet of each of the said flow passages with the total pressure and indicated air angle of compressed flow through the passages being uniform from the radial outlet of the shroud inner wall to the hub wall.
Claim 4
Dependent Claim
287 words
A centrifugal compressor comprising a stationary shroud with an inner wall having an axial inlet and a radial outlet, a continuously open inwardly converging inlet lip on said shroud fixedly connected with respect to said axial inlet to form a flow transition therebetween, a rotor including a hub adapted to be connected to a drive shaft, said hub including a hub wall having an axial inlet and a radial outlet a plurality of rotor blades supported on said hub wall including a radially outer tip and an axial leading edge and a radial trailing edge thereon, each of said rotor blades defining a flow passage therebetween bound by the inner wall of said stationary shroud and the hub wall and having a flow discontinuity negative pressure region at said tip from the axial leading edge through a part of the chamber length of said tip, a gap in the inner wall of said stationary shroud located circumferentially therearound at the flow transition between said inlet lip and said axial inlet, said gap being in communication with atmospheric pressure exteriorly of said stationary shroud and overlying the rotor blade tips immediately downstream of the leading edge of each of said rotor blades, an annular control ring movable with respect to said gap for regulating the communication between atmosphere and the inner wall of said stationary shroud to produce a controlled bleed of atmosphere to said negative pressure region to produce a uniform pressure and velocity gradient from the inlet to the outlet of each of the said flow passages with the total pressure and indicated air angle of compressed flow through the passages being uniform from the radial outlet of the shroud inner wall to the hub wall.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |