US4995791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerant gas compressor unit
Assignee: Bristol Compressors Inc
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Filing: 1988-11-25
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Granted: 1991-02-26
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Expires: 2008-11-25
Abstract
Abstract A refrigeration gas compressor unit having a casing, an electric motor driven compressor mounted in the casing, a housing containing and substantially isolating the inner cavities or passages of the motor from the casing cavity, refrigerant suction port in the casing, a primary-feed conduit connecting the suction port to the intake of the compressor, a secondary-feed conduit connecting the suction port to the primary-feed conduit and in part consisting of the passages between the housing, rotor and stator of the electric motor, a refrigerant flow control associated with the secondary-feed conduit for regulating the flow of refrigerant therethrough, and a refrigerant discharge port in the casing communicating with the compression chamber of the compressor.
Inventors
- 👤 Joseph F. Loprete
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:39
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/12; F04B39/123; Y; Y10; Y10S; Y10S417/00; Y10S417/902
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
113 words
A gas compressor unit comprising a casing, an electric motor driven compressor mounted in said casing, a housing containing the inner cavities or passages of the motor, refrigerant suction port means in said casing, primary-feed conduit means connecting said suction means to the intake of said compressor, secondary-feed conduit means including said housing and connecting said suction port means to said primary-feed conduit means, refrigerant flow control means associated with said secondary-feed conduit means for regulating refrigerant flow therethrough, said flow control means provides a pressure drop from said secondary-feed conduit means to said primary-feed conduit means, and refrigerant discharge port means in said casing communicating with the compression chamber of said compressor.
Claim 2
Dependent Claim
113 words
A gas compressor unit comprising a casing, an electric motor driven compressor mounted in said casing, a housing containing the inner cavities or passages of the motor, refrigerant suction port means in said casing, primary-feed conduit means connecting said suction means to the intake of said compressor, secondary-feed conduit means including said housing and connecting said suction port means to said primary-feed conduit means, refrigerant flow control means associated with said secondary-feed conduit means for regulating refrigerant flow therethrough, said flow control means provides a pressure drop from said secondary-feed conduit means to said primary-feed conduit means, and refrigerant discharge port means in said casing communicating with the compression chamber of said compressor.
Claim 3
Dependent Claim
27 words
The unit of claim 1 wherein said secondary-feed conduit means is substantially thermally isolated from the casing cavity, compressor head, compressor oil sump, and hot compressor oil.
Claim 4
Dependent Claim
31 words
The unit of claim 1 wherein said refrigerant flow control means allows between about 15% to about 40% by weight of the intake refrigerant to pass through the secondary-feed conduit means.
Claim 5
Dependent Claim
31 words
The unit of claim 1 wherein said refrigerant flow control means allows between about 19% to about 35% by weight of the intake refrigerant to pass through the secondary-feed conduit means.
Claim 6
Dependent Claim
17 words
The unit of claim 1 wherein liquid-gas separator means is provided in the suction conduit system thereof.
Claim 7
Dependent Claim
15 words
The unit of claim 1 wherein said flow control means is a thermostatically controlled valve.
Claim 8
Dependent Claim
40 words
The unit of claim 1 wherein said flow control means comprises the combination of predetermined aperture means in said secondary-feed conduit means, and venturi means in said primary-feed conduit means at the point of connection to said secondary-feed conduit means.
Claim 9
Dependent Claim
19 words
The unit of claim 6 wherein said valve is motor temperature responsive to open further as motor temperature increases.
References Cited (Backward Citations)
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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) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |