Patent US4626933A successfully refreshed from Google Patents.
Patent US3741676A successfully refreshed from Google Patents.
US3741676A
Expired / Lapsed
US
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Surge control for fluid compressors
Assignee: Barodyne Inc
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Filing: 1971-10-12
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Granted: 1973-06-26
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Expires: 1991-10-12
Abstract
Abstract A control means for preventing surging under changing or low flow conditions in a fluid compressor such as an air compressor which includes a rotor and diffuser and at least two stages of compression is disclosed. Compressed air from the n+1 stage of the compressor is injected into the diffuser of the nth or lower stage of the compressor through a collection chamber which is disposed about the diffuser.
Inventors
- 👤 D Silvern
- 👤 S Minton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:27
CPC Classifications
F; F04; F04D; F04D25/00; F04D25/02; F04D27/00; F04D27/02; F04D27/0207; F04D27/0215; F04D25/16; F04D25/163; F04D27/0238; F04D29/00; F04D29/66; F04D29/68; F04D29/681; F04D29/684; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
118 words
In a centrifugal fluid compressor such as an air compressor having a plurality of stages of compression at least one of which includes a diffuser, surge control means for controlling surging in the compressor comprising: a manifold coupled to said diffuser of one stage of compression defining a volume which communicates with said diffuser through orifices, said manifold including an inlet such that inlet fluid to said inlet enters said diffuser through said orifice; a line coupled between said inlet of said manifold and a higher stage of compression than said one stage of compression such that fluid may be removed from said higher state of compression and injected into the diffuser of said one stage of compression.
Claim 2
Dependent Claim
118 words
In a centrifugal fluid compressor such as an air compressor having a plurality of stages of compression at least one of which includes a diffuser, surge control means for controlling surging in the compressor comprising: a manifold coupled to said diffuser of one stage of compression defining a volume which communicates with said diffuser through orifices, said manifold including an inlet such that inlet fluid to said inlet enters said diffuser through said orifice; a line coupled between said inlet of said manifold and a higher stage of compression than said one stage of compression such that fluid may be removed from said higher state of compression and injected into the diffuser of said one stage of compression.
Claim 3
Dependent Claim
27 words
The means for controlling surging defined in claim 1 wherein a control means, for controlling the flow of fluid in said line, is coupled to said line.
Claim 4
Dependent Claim
36 words
The means for controlling surging defined in claim 1 wherein said orifices are disposed such that fluid entering said diffuser from said volume is injected in the direction of the prevailing flow direction in said diffuser.
Claim 5
Dependent Claim
18 words
The means for controlling surging defined in claim 3 wherein said orifices are tangentially disposed thrOugh said diffuser.
Claim 6
Dependent Claim
124 words
In a centrifugal air compressor which includes a plurality of stages of compression, each stage comprising a rotor and diffuser, surge control means comprising: a manifold defining a collection chamber disposed about the diffuser of one stage of compression said manifold having an inlet, and said collection chamber communicating with said diffuser through a plurality of orifices; a line for transporting air, coupled between said manifold inlet and a stage of compression higher than said one stage of compression such that air from said higher stage of compression may be injected into the diffuser of said one stage of compression, and control means for controlling the flow of air in said line as a function of the output flow of air from said compressor.
Claim 7
Dependent Claim
124 words
In a centrifugal air compressor which includes a plurality of stages of compression, each stage comprising a rotor and diffuser, surge control means comprising: a manifold defining a collection chamber disposed about the diffuser of one stage of compression said manifold having an inlet, and said collection chamber communicating with said diffuser through a plurality of orifices; a line for transporting air, coupled between said manifold inlet and a stage of compression higher than said one stage of compression such that air from said higher stage of compression may be injected into the diffuser of said one stage of compression, and control means for controlling the flow of air in said line as a function of the output flow of air from said compressor.
Claim 8
Dependent Claim
35 words
The surge control means defined in claim 5 wherein said orifices are disposed such that fluid entering said diffuser from said collection chamber is injected in the direction of the prevailing flow in said diffuser.
Claim 9
Dependent Claim
17 words
The surge control means defined in claim 6 wherein said orifices are tangentially disposed into said diffuser.
Claim 10
Dependent Claim
16 words
The surge control means defined in claim 7 wherein said compressor has two stages of compression.
Claim 11
Dependent Claim
19 words
The surge control means defined in claim 6 wherein said control means includes a valve disposed in said line.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |