US6032472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor cooling in a refrigeration system
Assignee: Carrier Corp
•
Filing: 1995-12-06
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Granted: 2000-03-07
•
Expires: 2015-12-06
Abstract
Abstract The expanded flow through a heat exchanger type economizer is controlled by an electronic expansion valve and is supplied to the motor of a motor compressor to cool the motor. The electronic expansion valve is controlled by a microprocessor responsive to the temperature of the motor winding sensed by a thermistor.
Inventors
- 👤 Anton D. Heinrichs
- 👤 Stanley R. Grant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:22
CPC Classifications
F; F25; F25B; F25B49/00; F04; F04C; F04C28/00; F04C28/28; F04C29/00; F04C29/04; F04C29/045; F25B31/00; F25B31/006; F25B40/00; F04C2240/00; F04C2240/40; F25B2400/00; F25B2400/13; F25B2600/00; F25B2600/25; F25B2600/2509; F25B2700/00; F25B2700/19; F25B2700/193; F25B2700/1931
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
79 words
A closed refrigeration system serially including a motor-compressor, a discharge line, a condenser, a heat exchanger economizer, an expansion device, an evaporator and a suction line, and temperature control means comprising: means for sensing a parameter representative of operating temperature of said motor; means for supplying an expanded flow through said economizer to said motor of said motor-compressor for cooling said motor; means for controlling said means for supplying an expanded refrigerant flow responsive to said means for sensing.
Claim 2
Dependent Claim
79 words
A closed refrigeration system serially including a motor-compressor, a discharge line, a condenser, a heat exchanger economizer, an expansion device, an evaporator and a suction line, and temperature control means comprising: means for sensing a parameter representative of operating temperature of said motor; means for supplying an expanded flow through said economizer to said motor of said motor-compressor for cooling said motor; means for controlling said means for supplying an expanded refrigerant flow responsive to said means for sensing.
Claim 3
Dependent Claim
16 words
The refrigeration system of claim 1 wherein said means for supplying includes an electronic expansion valve.
Claim 4
Dependent Claim
34 words
The refrigeration system of claim 1 further including means for sensing temperature in said discharge line and said means for controlling is also responsive to said means for sensing temperature in said discharge line.
Claim 5
Dependent Claim
34 words
The refrigeration system of claim 1 wherein said compressor of said motor-compressor is a single stage compressor and said expanded flow through said economizer is supplied initially to said motor of said motor compressor.
References Cited (Backward Citations)
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Cited
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US4899555A
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JPH0443261A
Cited
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Cited
US5475985A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-03-07 | 2003-09-06 | 2004-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-03-07 | 2007-09-06 | 2008-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-03-07 | 2011-09-06 | 2012-03-07 | $7700.00 | Window Closed / Lapsed |