US3869874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration apparatus with defrosting system
Assignee: York International Corp
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Filing: 1974-01-02
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Granted: 1975-03-11
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Expires: 1994-01-02
Abstract
Abstract An improved defrosting system for use with refrigeration apparatus, particularly of the type used for frozen food storage. The apparatus uses a two stage compressor with interstage cooling. During the defrost cycle, the suction gas from the evaporator coil is directed through the compressor so that the operation is in parallel, with a portion of the gas being admitted to the suction side of both the high stage and the low stage of the compressor. This permits an increased volume of hot gas at a higher temperature to be supplied to the evaporator and greatly reduces the time required to defrost the coil.
Inventors
- 👤 John L Ditzler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:39
CPC Classifications
F; F25; F25B; F25B47/00; F25B1/00; F25B1/10; F25B2400/00; F25B2400/07; F25B2400/075; F25B40/00; F25B40/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A refrigeration system comprising: a compressor, a condenser, an expansion device and an evaporator all connected in closedcircuit, refrigerant flow relationship, said compressor having a low stage and a high stage; means for conducting refrigerant from said low stage to said high stage in series flow during refrigeration operation; a hot gas defrost line connecting said compressor to said evaporator; a hot gas line connecting said high stage to said condenser; a suction gas line connecting said evaporator and Said low stage; an interstage gas line connecting said low stage and said high stage; a valve in said interstage gas line; a branch line connecting said evaporator and said high stage, whereby upon closing of said valve, suction gas will flow through said low stage and said high stage in parallel; and means for cooling gas flowing through said interstage gas line.
Claim 2
Dependent Claim
142 words
A refrigeration system comprising: a compressor, a condenser, an expansion device and an evaporator all connected in closedcircuit, refrigerant flow relationship, said compressor having a low stage and a high stage; means for conducting refrigerant from said low stage to said high stage in series flow during refrigeration operation; a hot gas defrost line connecting said compressor to said evaporator; a hot gas line connecting said high stage to said condenser; a suction gas line connecting said evaporator and Said low stage; an interstage gas line connecting said low stage and said high stage; a valve in said interstage gas line; a branch line connecting said evaporator and said high stage, whereby upon closing of said valve, suction gas will flow through said low stage and said high stage in parallel; and means for cooling gas flowing through said interstage gas line.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |