US3653223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic overheat protection for refrigeration system
Assignee: Trane US Inc
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Filing: 1970-08-31
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Granted: 1972-04-04
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Expires: 1990-08-31
Abstract
Abstract A schematic of an engine driven truck refrigeration system with control circuits is shown. The circuitry provides for automatic shutdown of the refrigeration system should the temperature of the conditioned space exceed a predetermined maximum overheat temperature to thereby prevent a malfunctioning refrigeration system from ''''cooking'''' the contents of the conditioned space. A lockout circuit prevents the shutdown circuit from functioning until the control point temperature has been reached or until a defrost mode is initiated so as to permit temperature pull down of the contents of the conditioned space from a temperature exceeding the predetermined maximum overheat temperature.
Inventors
- 👤 Daniel F Jones
- 👤 David J Petranek
- 👤 Harlan J Rosin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:56
CPC Classifications
F; F25; F25B; F25B49/00; F25B49/02; F24; F24F; F24F5/00; F24F5/0007; F24F5/001; F25B13/00; F25B27/00; F25D; F25D29/00; F25D29/003
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
193 words
A vehicular refrigeration apparatus comprising: a prime mover; cooling means adapted to be energized by said prime mover for cooling a space within a vehicle; heating means adapted to be energized by said prime mover capable of heating said space; automatic control means for controlling operation of said cooling means, heating means and prime mover including means for automatically operating said prime mover, cooling actuator means for energizing said cooling means by said prime mover in response to a temperature of said space above a first predetermined temperature, heating actuator means for energizing said heating means by said prime mover in response to a demand for heating, and overheat protector means for discontinuing automatic operation of said prime mover in response to a temperature of said space above a second predetermined temperature higher than said first predetermined temperature; and manual actuator means for rendering said automatic control means operative; said automatic control means further including means for temporarily rendering said overheat protector means inoperative following actuation of said manual actuator means thereby permitting said cooling means to initially pull down the temperature of said space from a temperature exceeding said second predetermined temperature.
Claim 2
Dependent Claim
193 words
A vehicular refrigeration apparatus comprising: a prime mover; cooling means adapted to be energized by said prime mover for cooling a space within a vehicle; heating means adapted to be energized by said prime mover capable of heating said space; automatic control means for controlling operation of said cooling means, heating means and prime mover including means for automatically operating said prime mover, cooling actuator means for energizing said cooling means by said prime mover in response to a temperature of said space above a first predetermined temperature, heating actuator means for energizing said heating means by said prime mover in response to a demand for heating, and overheat protector means for discontinuing automatic operation of said prime mover in response to a temperature of said space above a second predetermined temperature higher than said first predetermined temperature; and manual actuator means for rendering said automatic control means operative; said automatic control means further including means for temporarily rendering said overheat protector means inoperative following actuation of said manual actuator means thereby permitting said cooling means to initially pull down the temperature of said space from a temperature exceeding said second predetermined temperature.
Claim 3
Dependent Claim
22 words
The apparatus as defined by claim 1 wherein said overheat protector means is rendered inoperative until operation of said heat actuator means.
Claim 4
Dependent Claim
25 words
The apparatus as defined by claim 1 wherein said overheat protector means is rendered inoperative until said cooling means is actuated to a noncooling cycle.
Claim 5
Dependent Claim
166 words
A refrigeration apparatus for cooling a conditioned space comprising: a refrigerant circuit including; a refrigerant compressor, a first heat exchanger disposed in heat exchange relationship with outdoor ambient air, a refrigerant throttling means, and a second heat exchanger disposed in heat exchange relationship with said conditioned space; means for directing refrigerant respectively through said compressor, said first heat exchanger, said throttling means, and said second heat exchanger back to said compressor whereby said refrigeration apparatus is operated in a cooling mode to cool said conditioned space; control means responsive to the temperature of said conditioned space for cycling said refrigeration apparatus to and from said cooling mode for maintaining the temperature in said conditioned space substantially at a predetermined first temperature; said refrigerant circuit including means for supplying hot refrigerant from said compressor to said second heat exchanger for warming said second heat exchanger; and means de-energizing said compressor in response to a second predetermined temperature of said conditioned space higher than said first predetermined temperature.
Claim 6
Dependent Claim
166 words
A refrigeration apparatus for cooling a conditioned space comprising: a refrigerant circuit including; a refrigerant compressor, a first heat exchanger disposed in heat exchange relationship with outdoor ambient air, a refrigerant throttling means, and a second heat exchanger disposed in heat exchange relationship with said conditioned space; means for directing refrigerant respectively through said compressor, said first heat exchanger, said throttling means, and said second heat exchanger back to said compressor whereby said refrigeration apparatus is operated in a cooling mode to cool said conditioned space; control means responsive to the temperature of said conditioned space for cycling said refrigeration apparatus to and from said cooling mode for maintaining the temperature in said conditioned space substantially at a predetermined first temperature; said refrigerant circuit including means for supplying hot refrigerant from said compressor to said second heat exchanger for warming said second heat exchanger; and means de-energizing said compressor in response to a second predetermined temperature of said conditioned space higher than said first predetermined temperature.
Claim 7
Dependent Claim
80 words
Refrigeration apparatus comprising means for controlling the temperature of a space; disrupting means responsive to the temperature of said space for disrupting operation of said temperatUre controlling means in response to a predetermined abnormally high temperature indicative of a failure of said temperature controlling means and; means for automatically overriding said disrupting means whereby said temperature controlling means may be operated to pull down the temperature of said space from a temperature in excess of said predetermined abnormally high temperature.
Claim 8
Dependent Claim
80 words
Refrigeration apparatus comprising means for controlling the temperature of a space; disrupting means responsive to the temperature of said space for disrupting operation of said temperatUre controlling means in response to a predetermined abnormally high temperature indicative of a failure of said temperature controlling means and; means for automatically overriding said disrupting means whereby said temperature controlling means may be operated to pull down the temperature of said space from a temperature in excess of said predetermined abnormally high temperature.
Claim 9
Dependent Claim
102 words
In a prime mover powered compression cycle refrigeration system having both heating and cooling cycles for conditioning a space, the improvement comprising: a first circuit including a temperature responsive overheat switch responsive to the temperature of said conditioned space for energizing said prime mover; a second circuit including a cycle selector means and a thermostat responsive to the temperature of said conditioned space; and a third circuit responsive to the operating condition of said second circuit including a relay having a first switch shunting said overheat switch and a second switch for holding said relay energized after interruption of said third circuit.
Claim 10
Dependent Claim
102 words
In a prime mover powered compression cycle refrigeration system having both heating and cooling cycles for conditioning a space, the improvement comprising: a first circuit including a temperature responsive overheat switch responsive to the temperature of said conditioned space for energizing said prime mover; a second circuit including a cycle selector means and a thermostat responsive to the temperature of said conditioned space; and a third circuit responsive to the operating condition of said second circuit including a relay having a first switch shunting said overheat switch and a second switch for holding said relay energized after interruption of said third circuit.
Claim 11
Dependent Claim
43 words
The apparatus as defined by claim 4 including means for automatically overriding said means for de-energizing said compressor whereby said refrigeration apparatus may be operated to pull down the temperature of said conditioned space from a temperature in excess of said predetermined temperature.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |