US3633378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot gas defrosting system
Assignee: Security Pacific Business Credit Inc
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Filing: 1970-07-15
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Granted: 1972-01-11
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Expires: 1990-07-15
Abstract
Abstract The invention relates to a central-type of refrigeration system in which multiple evaporator coils are remotely located from the compressor and condenser. The system has hot gas defrosting means associated therewith which operates during a defrosting cycle in a manner so that all of the hot refrigerant gas delivered by the compressor is utilized for the defrosting operation except when abnormal or unusual heat load conditions are present. When the abnormal conditions are present the compressor is partially diverted from its defrosting function just sufficiently so that the primary cooling function of the system is sustained at a predetermined level.
Inventors
- 👤 Steven J Toth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:23
CPC Classifications
F; F25; F25B; F25B5/00; F25B5/02; F25B47/00; F25B47/02; F25B47/022; F25B2400/00; F25B2400/22
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
241 words
A refrigeration system comprising a compressor, a condenser, a compressor discharge line between said compressor and said condenser, a compressor suction line connected to said compressor, a liquid supply line connected to the downstream side of said condenser and having a plurality of branch passages, fully closable liquid supply valve means in said liquid supply line on the upstream side from said branch passages, a plurality of evaporators each having first and second ports at opposite ends thereof, a pair of parallel lines extending from each of said branch passages to each of said evaporator first ports respectively, each of said pairs of parallel lines having one line thereof with check valve means and the other line thereof with control valve means, a plurality of conduits connected to said compressor suction line and respectively to said second ports of said evaporators, a normally open conduit valve disposed in each of said conduits, a plurality of hot gas supply lines connected to said compressor discharge line and respectively to said evaporators at points respectively between said conduit valves and said second ports, defrost control means for completely closing said liquid supply valve means and for selectively closing one of said conduit valves, and pressure sensing and responsive means connected to said liquid supply line downstream from said liquid supply valve means for regulating said liquid supply valve means to maintain a predetermined pressure in the downstream side of said liquid supply line.
Claim 2
Dependent Claim
241 words
A refrigeration system comprising a compressor, a condenser, a compressor discharge line between said compressor and said condenser, a compressor suction line connected to said compressor, a liquid supply line connected to the downstream side of said condenser and having a plurality of branch passages, fully closable liquid supply valve means in said liquid supply line on the upstream side from said branch passages, a plurality of evaporators each having first and second ports at opposite ends thereof, a pair of parallel lines extending from each of said branch passages to each of said evaporator first ports respectively, each of said pairs of parallel lines having one line thereof with check valve means and the other line thereof with control valve means, a plurality of conduits connected to said compressor suction line and respectively to said second ports of said evaporators, a normally open conduit valve disposed in each of said conduits, a plurality of hot gas supply lines connected to said compressor discharge line and respectively to said evaporators at points respectively between said conduit valves and said second ports, defrost control means for completely closing said liquid supply valve means and for selectively closing one of said conduit valves, and pressure sensing and responsive means connected to said liquid supply line downstream from said liquid supply valve means for regulating said liquid supply valve means to maintain a predetermined pressure in the downstream side of said liquid supply line.
Claim 3
Dependent Claim
53 words
A refrigeration system according to claim 1 having solenoid means for operating said supply valve means connected thereto, said pressure sensing and responsive means including a pressure-operated valve regulator and a sensing tube, said tube being connected to said liquid supply line on the downstream side thereof from said liquid supply valve means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |