US5266002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal compressor with pipe diffuser and collector
Assignee: Carrier Corp
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Filing: 1991-11-22
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Granted: 1993-11-30
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Expires: 2011-11-22
Abstract
Abstract A channel type diffuser is applied to a centrifugal compressor to obtain substantially complete expansion of the refrigerant downstream of the impeller wheel. The relatively large volume of expanded gases that results from such a diffusion process is accommodated by the use of a relatively large volume collecter with a uniform circumferential cross section. The result is higher efficiencies and a more stable operating range.
Inventors
- 👤 Joost J. Brasz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:39
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/441; F04D29/444; F05; F05D; F05D2250/00; F05D2250/50; F05D2250/52
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
121 words
A centrifugal compressor of the type having an impeller for accelerating refrigerant gas to a high velocity, a diffuser for converting a portion of the kinetic energy of the gas to pressure energy, and a discharge chamber for receiving decelerated gas from the diffuser for further transfer to a condenser, wherein: said diffuser comprises a plurality of circumferentially spaced, generally radially extending, flared channels with exit and inlet openings having cross sectional areas such that the area ratios are at least 5 to 1; and said discharge chamber comprises a circumferentially symmetrical collector having a radial cross sectional area that is at least one and a half times as large as the combined cross sectional areas of said channel exit openings.
Claim 2
Dependent Claim
121 words
A centrifugal compressor of the type having an impeller for accelerating refrigerant gas to a high velocity, a diffuser for converting a portion of the kinetic energy of the gas to pressure energy, and a discharge chamber for receiving decelerated gas from the diffuser for further transfer to a condenser, wherein: said diffuser comprises a plurality of circumferentially spaced, generally radially extending, flared channels with exit and inlet openings having cross sectional areas such that the area ratios are at least 5 to 1; and said discharge chamber comprises a circumferentially symmetrical collector having a radial cross sectional area that is at least one and a half times as large as the combined cross sectional areas of said channel exit openings.
Claim 3
Dependent Claim
18 words
A centrifugal compressor as set forth in claim 1, wherein the refrigerant is a relatively high density refrigerant.
Claim 4
Dependent Claim
14 words
A centrifugal compressor as set forth in claim 2, wherein said refrigerant is HCFC-22.
Claim 5
Dependent Claim
46 words
A centrifugal compressor as set forth in claim 1 wherein said channels each comprise two serially connected sections, with a first radially inward section having diverging opposed walls angled at one angle, and a second section having diverging opposed walls angled at a larger second angle.
Claim 6
Dependent Claim
37 words
A centrifugal compressor as set forth in claim 4 wherein the angle between the opposed walls in the first section is four degrees and the angle between the opposed walls in the second section is eight degrees.
Claim 7
Dependent Claim
18 words
A centrifugal compressor as set forth in claim 1 wherein said channels are round in transverse cross section.
Claim 8
Dependent Claim
18 words
A centrifugal compressor as set forth in claim 6 wherein said channels are frustro-conical in longitudinal cross section.
Claim 9
Dependent Claim
26 words
A centrifugal compressor as set forth in claim 1 wherein said collector has an internal diameter which is equal to an outer diameter of said diffuser.
Claim 10
Dependent Claim
33 words
A centrifugal compressor as set forth in claim 1 wherein the collector cross sectional area is at least two times as large as the combined cross sectional areas of said channel exit openings.
References Cited (Backward Citations)
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US3964837A
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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) | 1996-11-29 | 1997-05-31 | 1997-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-29 | 2001-05-31 | 2001-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-29 | 2005-05-31 | 2005-11-30 | $7700.00 | Window Closed / Lapsed |