US3851494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor vehicle cooling system with bypass regulated heat exchanger
Assignee: Robert Bosch GmbH
•
Filing: 1973-07-09
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Granted: 1974-12-03
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Expires: 1993-07-09
Abstract
Abstract Excessive warming of the compressor input by the heat exchanger that supercools the condenser output is prevented by a bypass switched in and out by a thermostatic control at the output of the compressor to prevent the final compression temperature from rising to a value at which damage to lubricating materials and flexible hose materials would result. A branching valve or a second expansion valve may be used according to whether the bypass is just around the heat exchanger or around both the heat exchanger and the evaporator.
Inventors
- 👤 J Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:39
CPC Classifications
F; F25; F25B; F25B1/00; F25B41/00; F25B41/20; F25B2600/00; F25B2600/25; F25B2600/2507; F25B2700/00; F25B2700/21; F25B2700/2115; F25B2700/21152; F25B40/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
119 words
A cooling system particularly suitable for a motor vehicle, comprising a compressor, a condenser, a heat exchanger for further cooling of the liquidified refrigerant, an expansion valve and an evaporator arranged for continuously cycling the refrigerant, wherein: said heat exchanger is arranged to cool said liquid refrigerant by warming cooled vapor from said evaporator before it is supplied to said compressor, and automatically regulated bypass means are provided for reducing the temperature of the vapor provided to said compressor in response to thermostatic means responsive to the temperature of the refrigerant output of said compressor, and thereby to prevent the output of said compressor from reaching a temperature damaging to organic compounds exposed to the refrigerant of the system.
Claim 2
Dependent Claim
119 words
A cooling system particularly suitable for a motor vehicle, comprising a compressor, a condenser, a heat exchanger for further cooling of the liquidified refrigerant, an expansion valve and an evaporator arranged for continuously cycling the refrigerant, wherein: said heat exchanger is arranged to cool said liquid refrigerant by warming cooled vapor from said evaporator before it is supplied to said compressor, and automatically regulated bypass means are provided for reducing the temperature of the vapor provided to said compressor in response to thermostatic means responsive to the temperature of the refrigerant output of said compressor, and thereby to prevent the output of said compressor from reaching a temperature damaging to organic compounds exposed to the refrigerant of the system.
Claim 3
Dependent Claim
42 words
A cooling system as defined in claim 1, in which said bypass means is a bypass around the vapor side (7) of said heat exchanger (3) controlled by a branching valve (6) for cutting said heat exchanger into and out of operation.
Claim 4
Dependent Claim
28 words
A cooling system as defined in claim 2, in which said thermostatic means (9) is a temperature sensor in the refrigerant circulation path directly behind said compressor (1).
Claim 5
Dependent Claim
45 words
A cooling system as defined in claim 1, in which said bypass means is a bypass around said evaporator (15) controlled by a second expansion valve (17) in response to thermostatic means (18) responsive to the temperature of the refrigerant output of said compressor (11).
Claim 6
Dependent Claim
27 words
A cooling system as defined in claim 4, in which said thermostatic means (18) is a thermosensor in the refrigerant circulation path directly behind said compressor (11).
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |