US3590595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cascade refrigeration system with refrigerant bypass
Assignee: Venturedyne Ltd
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Filing: 1969-06-03
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Granted: 1971-07-06
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Expires: 1989-06-03
Abstract
Abstract A cascade refrigeration system for installation where the machinery of the system is remote from the cooled space, in which an insulated bypass conduit withdraws at least some of the refrigerant available at the cooled space under a low-load condition, and delivers this refrigerant to a condenser in one of the stages, thus maintaining the circulation of refrigerant.
Inventors
- 👤 Mark W Briggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:17
CPC Classifications
F; F25; F25B; F25B7/00; F25B2339/00; F25B2339/04; F25B2339/047; F25B40/00; F25B40/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
187 words
A cascade refrigeration system including a first stage having a compressor, a remote heat-absorbing evaporator unit, and a condenser, and also including a second stage having a compressor and a condenser, and including conduit means connecting the output thereof with said first stage condenser, said first stage having a liquid conduit extending from said condenser unit to said first stage evaporator unit, and a return gas conduit extending from said first stage evaporator unit to the input of said first stage compressor, wherein the improvement comprises: a bypass circuit communicating with said liquid conduit at a point adjacent said first stage evaporator unit, and including a control valve adjacent said point and responsive to temperature conditions associated with said first stage evaporator unit and adapted to divert refrigerant into said bypass circuit, said circuit also including expansion means, a bypass heat exchanger in heat-exchanging relationship with the output of one of said compressors, a heat-insulated conduit extending from said expansion means to said bypass heatexchanger, and a return conduit extending from said bypass heat exchanger to a point communicating with the input into one of said compressors.
Claim 2
Dependent Claim
187 words
A cascade refrigeration system including a first stage having a compressor, a remote heat-absorbing evaporator unit, and a condenser, and also including a second stage having a compressor and a condenser, and including conduit means connecting the output thereof with said first stage condenser, said first stage having a liquid conduit extending from said condenser unit to said first stage evaporator unit, and a return gas conduit extending from said first stage evaporator unit to the input of said first stage compressor, wherein the improvement comprises: a bypass circuit communicating with said liquid conduit at a point adjacent said first stage evaporator unit, and including a control valve adjacent said point and responsive to temperature conditions associated with said first stage evaporator unit and adapted to divert refrigerant into said bypass circuit, said circuit also including expansion means, a bypass heat exchanger in heat-exchanging relationship with the output of one of said compressors, a heat-insulated conduit extending from said expansion means to said bypass heatexchanger, and a return conduit extending from said bypass heat exchanger to a point communicating with the input into one of said compressors.
Claim 3
Dependent Claim
21 words
A system as defined in claim 1, wherein said bypass return conduit communicates with the input of said first stage compressor.
Claim 4
Dependent Claim
27 words
A system as defined in claim 1, wherein said bypass heat exchanger is disposed with the output thereof connected to the input of said first stage condenser.
References Cited (Backward Citations)
US2680956A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |