US3706510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe diffuser with auxiliary bleed system
Assignee: Avco Corp
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Filing: 1971-08-02
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Granted: 1972-12-19
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Expires: 1991-08-02
Abstract
Abstract The disclosure illustrates a ''''pipe'''' diffuser having basic flow passages sized to handle the output requirements of a centrifugal compressor without a bleed requirement. The diffuser has a series of auxiliary bleed passages intersecting the inlet portions of the pipe diffuser passages. The bleed passages are sized to handle a supplementary bleed flow requirement when needed.
Inventors
- 👤 John A O'connor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:51
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/441; F04D29/444; F04D29/66; F04D29/68; F04D29/681; F04D29/682; F04D27/00; F04D27/02; F04D27/0207; F04D27/0215; F04D27/023; F05; F05D; F05D2240/00; F05D2240/10; F05D2240/12; F05D2240/121
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
A compressor assembly comprising: a rotatable bladed centrifugal impeller; an annular diffuser housing surrounding the periphery of said impeller, said diffuser housing having a plurality of generally tangentially directed primary diffuser passages intersecting adjacent the periphery of said impeller to form a series of generally scalloped inlet edges to said diffuser passages, said diffuser having a series of auxiliary bleed passages extending from said diffuser passages; the intersection between them being forward of the primary passage throat; and means for selectively permitting or blocking flow through said bleed passages whereby the effective total throat area of said diffuser is varied.
Claim 2
Dependent Claim
100 words
A compressor assembly comprising: a rotatable bladed centrifugal impeller; an annular diffuser housing surrounding the periphery of said impeller, said diffuser housing having a plurality of generally tangentially directed primary diffuser passages intersecting adjacent the periphery of said impeller to form a series of generally scalloped inlet edges to said diffuser passages, said diffuser having a series of auxiliary bleed passages extending from said diffuser passages; the intersection between them being forward of the primary passage throat; and means for selectively permitting or blocking flow through said bleed passages whereby the effective total throat area of said diffuser is varied.
Claim 3
Dependent Claim
45 words
A compressor assembly as in claim 1 wherein the longitudinal axes of the diffuser and bleed passages intersect at an angle sufficiently small so that the static pressure recovery potential in the secondary bleed passages is of the same order as in the primary passages.
Claim 4
Dependent Claim
55 words
A compressor assembly as in claim 1 having predetermined flow requirements for bleed closed and bleed open conditions and wherein: said primary diffuser passageways have a flow area to provide maximum efficiency for a bleed closed condition; said auxiliary bleed passages have a flow area sized to provide maximum efficiency for a bleed open condition.
Claim 5
Dependent Claim
41 words
A compressor assembly as in claim 1 wherein the longitudinal axes of said diffuser passages substantially lie in a given plane and wherein the longitudinal axes of the bleed passages lie in the same plane and in between adjacent diffuser passages.
Claim 6
Dependent Claim
41 words
A compressor assembly as in claim 1 wherein the longitudinal axes of said diffuser passages lie in a given plane and the longitudinal axes of said bleed passageways extend from said diffuser passageways at an oblique angle relative to said plane.
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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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |