US3778186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radial diffuser
Assignee: Motors Liquidation Co
•
Filing: 1972-02-25
•
Granted: 1973-12-11
•
Expires: 1992-02-25
Abstract
Abstract A diffuser for a centrifugal compressor has diffusing passages of circular or oval cross section which converge toward a throat and then diverge. The passages are of generally spiral curvature, at least in the converging portion. The entrances of the diffuser passages merge to define leading edges of generally elliptical shape between the passages.
Inventors
- 👤 P Bandukwalla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:32
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/441
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
89 words
A centrifugal compressor including a rotor discharging radially and tangentially of the axis of the rotor and a diffuser body defining diffuser passages having entrances adjacent the periphery of the rotor, the passages having arcuate crosssections and merging adjacent the rotor so that the body defines approximately elliptical leading edges at the intersections of the passage boundaries, each passage including a first converging portion with a spiral centerline terminating at a throat and a second diverging portion beginning at and extending in a continuous spiral downstream from the throat.
Claim 2
Dependent Claim
89 words
A centrifugal compressor including a rotor discharging radially and tangentially of the axis of the rotor and a diffuser body defining diffuser passages having entrances adjacent the periphery of the rotor, the passages having arcuate crosssections and merging adjacent the rotor so that the body defines approximately elliptical leading edges at the intersections of the passage boundaries, each passage including a first converging portion with a spiral centerline terminating at a throat and a second diverging portion beginning at and extending in a continuous spiral downstream from the throat.
Claim 3
Dependent Claim
91 words
A centrifugal compressor including a rotor discharging radially and tangentially of the axis of the rotor and a diffuser body defining diffuser passages having entrances adjacent the periphery of the rotor, the passages having arcuate cross-sections and merging adjacent the rotor so that the body defines approximately elliptical leading edges at the intersections of the passage boundaries, each passage including a first converging portion terminating at a throat and a second diverging portion beginning at and extending downstream from the throat, both portions having continuous spiral centerlines meeting at the throat.
Claim 4
Dependent Claim
91 words
A centrifugal compressor including a rotor discharging radially and tangentially of the axis of the rotor and a diffuser body defining diffuser passages having entrances adjacent the periphery of the rotor, the passages having arcuate cross-sections and merging adjacent the rotor so that the body defines approximately elliptical leading edges at the intersections of the passage boundaries, each passage including a first converging portion terminating at a throat and a second diverging portion beginning at and extending downstream from the throat, both portions having continuous spiral centerlines meeting at the throat.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |