US3777509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil return system for refrigeration apparatus
Assignee: York International Corp
•
Filing: 1972-03-13
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Granted: 1973-12-11
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Expires: 1992-03-13
Abstract
Abstract Apparatus for assuring return of oil separated from refrigerant in a vapor cycle refrigeration system. Means are provided for positively effecting flow of oil from a lower pressure reservoir into a crankcase of a compressor which is normally maintained at a higher pressure. Such means may take the form of an eductor powered by flow of lubricating oil in a closed circuit with respect to the compressor.
Inventors
- 👤 P Muench
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:15
CPC Classifications
F; F25; F25B; F25B31/00; F25B31/002; F25B31/004; F25B2341/00; F25B2341/001; F25B2341/0016; F25B2400/00; F25B2400/01; F25B2400/07; F25B2400/075; F25B2700/00; F25B2700/03
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
112 words
In a refrigeration system including a compressor having an oil-carrying crankcase; an oil separator connected to the high pressure side of said compressor to effect separation of oil from the refrigerant; means providing a closed lubricant oil circuit in fluid communication with said crankcase of said compressor; an oil receiver connected to the oil discharge side of said oil separator and to said circuit, said receiver containing oil under pressure lower than the pressure of the oil in said crankcase; and eductor means in said circuit and operative, in response to the pressure generated by the oil circulating in said circuit, to effect flow of oil from said receiver into said circuit.
Claim 2
Dependent Claim
112 words
In a refrigeration system including a compressor having an oil-carrying crankcase; an oil separator connected to the high pressure side of said compressor to effect separation of oil from the refrigerant; means providing a closed lubricant oil circuit in fluid communication with said crankcase of said compressor; an oil receiver connected to the oil discharge side of said oil separator and to said circuit, said receiver containing oil under pressure lower than the pressure of the oil in said crankcase; and eductor means in said circuit and operative, in response to the pressure generated by the oil circulating in said circuit, to effect flow of oil from said receiver into said circuit.
Claim 3
Dependent Claim
74 words
A refrigeration system as defined in claim 1 including a conduit connecting said receiver to said closed lubricant oil circuit; means for sensing the oil level in said crankcase; and valve means associated with said conduit and responsive to said oil level sensing means for permitting oil in said receiver to flow through said conduit into said circuit by the operation of said eductor whenever said oil level is less than a predetermined value.
References Cited (Backward Citations)
US1899378A
Cited
US2892320A
Cited
US2975613A
Cited
US3304697A
Cited
US3360958A
Cited
US3418962A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |