US3677028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration system
Assignee: Carrier Corp
•
Filing: 1970-12-01
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Granted: 1972-07-18
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Expires: 1990-12-01
Abstract
Abstract A refrigeration system employing a plurality of evaporator circuits, the refrigerant flow to each circuit being controlled by a shut-off valve and a fixed restriction, the valve when open providing a first stage restriction to minimize the required pressure drop across the fixed restriction.
Inventors
- 👤 Glendon A Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:59
CPC Classifications
F; F25; F25B; F25B5/00; F25B5/02; F25B41/00; F25B41/30; F25B41/385
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
167 words
A refrigeration system comprising a compressor; a condenser for condensing refrigerant vapor from said compressor; a plurality of evaporator circuits for passing heat exchange medium to be cooled in heat exchange relationship with refrigerant from said condenser, the refrigerant in the evaporator circuits being heated and vaporized thereby; individual valve means associated with each of said evaporator circuits, each of said individual valve means being adapted to prevent flow of refrigerant to the evaporator circuit associated therewith when said valve means is closed and to provide a first stage pressure drop to restrict flow of refrigerant to the evaporator circuit associated therewith when said valve means is open; and fixed restriction means disposed immediately downstream from each of said individual valve means to provide a second stage pressure drop to restrict flow of refrigerant to the evaporator circuit associated therewith, said individual valve means providing at least 50 percent of the pressure drop created by the combination of said individual valve means and said fixed restriction means.
Claim 2
Dependent Claim
167 words
A refrigeration system comprising a compressor; a condenser for condensing refrigerant vapor from said compressor; a plurality of evaporator circuits for passing heat exchange medium to be cooled in heat exchange relationship with refrigerant from said condenser, the refrigerant in the evaporator circuits being heated and vaporized thereby; individual valve means associated with each of said evaporator circuits, each of said individual valve means being adapted to prevent flow of refrigerant to the evaporator circuit associated therewith when said valve means is closed and to provide a first stage pressure drop to restrict flow of refrigerant to the evaporator circuit associated therewith when said valve means is open; and fixed restriction means disposed immediately downstream from each of said individual valve means to provide a second stage pressure drop to restrict flow of refrigerant to the evaporator circuit associated therewith, said individual valve means providing at least 50 percent of the pressure drop created by the combination of said individual valve means and said fixed restriction means.
Claim 3
Dependent Claim
16 words
A refrigeration system according to claim 1 wherein said refrigerant restriction means is a capillary tube.
Claim 4
Dependent Claim
42 words
A refrigeration system according to claim 2 wherein each of said individual valve means comprises a solenoid valve, the total restriction to refrigerant flow through said solenoid valve and said capillary producing the required refrigerant flow to the evaporator circuit associated herewith.
References Cited (Backward Citations)
US1803074A
Cited
US2148413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |