US3633380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigerator system
Assignee: Individual
•
Filing: 1970-03-23
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Granted: 1972-01-11
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Expires: 1990-03-23
Abstract
Abstract A pressurized refrigeration system having a condenser, an evaporator, and a compressor is provided with an isobaric valve between the evaporator and the compressor. The isobaric valve is sensitive to the output pressure of the compressor to restrict the flow of refrigerant fluid into the compressor when the output pressure of the fluid from the compressor increases above a first predetermined value. The isobaric valve also has a normally closed pressure-sensitive switch which operates to disconnect the compressor from its drive means if the pressure of the refrigerant fluid from the compressor falls below a second predetermined value, such as when a leak occurs in the refrigeration system.
Inventors
- 👤 Italo Pellizzetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:18
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F25; F25B; F25B41/00; F25B41/20; F25B41/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
218 words
In a pressurized refrigeration system having an evaporator, a compressor for compressing a refrigerant fluid, said compressor having a low-pressure input connection, a highpressure output connection, drive means for said compressor, an isobaric valve having an input connection to said evaporator, an output connection to said low-pressure input connection of said compressor, a passageway between said input connection of said isobaric valve, and said output connection of said isobaric valve, and a shutter in said passageway, means for controlling said shutter in dependence on the pressure of said refrigerant fluid from said output connection of said compressor whereby said shutter reduces the flow through said passageway to reduce the flow of said refrigerant fluid to said input connection of said compressor when said pressure of refrigerant fluid from said output connection of said compressor exceeds a first predetermined value, the improvement comprising an electrical circuit including electromagnetic clutch means in said drive means for said compressor, said isobaric valve further including pressure-responsive switch means in said electrical circuit in communication with said high-pressure outlet connection of said compressor, said pressure-responsive switch means being operative to cause disengagement of said electromagnetic clutch means to disconnect said drive means from said compressor when said pressure of fluid from said output connection of said compressor falls below a second predetermined value.
Claim 2
Dependent Claim
218 words
In a pressurized refrigeration system having an evaporator, a compressor for compressing a refrigerant fluid, said compressor having a low-pressure input connection, a highpressure output connection, drive means for said compressor, an isobaric valve having an input connection to said evaporator, an output connection to said low-pressure input connection of said compressor, a passageway between said input connection of said isobaric valve, and said output connection of said isobaric valve, and a shutter in said passageway, means for controlling said shutter in dependence on the pressure of said refrigerant fluid from said output connection of said compressor whereby said shutter reduces the flow through said passageway to reduce the flow of said refrigerant fluid to said input connection of said compressor when said pressure of refrigerant fluid from said output connection of said compressor exceeds a first predetermined value, the improvement comprising an electrical circuit including electromagnetic clutch means in said drive means for said compressor, said isobaric valve further including pressure-responsive switch means in said electrical circuit in communication with said high-pressure outlet connection of said compressor, said pressure-responsive switch means being operative to cause disengagement of said electromagnetic clutch means to disconnect said drive means from said compressor when said pressure of fluid from said output connection of said compressor falls below a second predetermined value.
Claim 3
Dependent Claim
26 words
The isobaric valve of claim 1 wherein said output connection of said isobaric valve is shaped for direct attachment to said input connection of said compressor.
Claim 4
Dependent Claim
33 words
The isobaric valve of claim 1 wherein said output connection of said isobaric valve is shaped with two ears whereby said isobaric valve can be bolted to said input connection of said compressor.
Claim 5
Dependent Claim
40 words
The isobaric valve of claim 1 wherein said output connection of said isobaric valve is shaped with an annular projection, a threaded ring nut mounted on said annular projection whereby said output connection may be coupled to a threaded connector.
Claim 6
Dependent Claim
46 words
The isobaric valve of claim 1 further comprising a valve in communication with said passageway between said input connection and said output connection of said isobaric valve whereby said isobaric valve can be connected to a pump for charging said refrigeration system with said refrigerant fluid.
References Cited (Backward Citations)
US2916892A
Cited
US3041847A
Cited
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 |