Patent US4995791A successfully refreshed from Google Patents.
US4995791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerant gas compressor unit
Assignee: Bristol Compressors Inc
•
Filing: 1988-11-25
•
Granted: 1991-02-26
•
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 16:50
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)
US4147479A
Cited
US4486153A
Cited
US4470772A
Cited
JPS60119397A
Cited
JPS63285286A
Cited
US4850816A
Cited
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 |