US Patent No: 5,415,008
Number of patents in Portfolio can not be more than 2000
Refrigerant flow rate control based on suction line temperature
Stats
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May 16, 1995
Issued date -
Mar 3, 1994
filing date -
08/205,857
serial no -
Expired
status
Importance
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Abstract
Pulse width modulation is used to control the flow rate through a solenoid expansion valve in a refrigeration system. A device for sensing suction line temperature is provided, and a controller is included for controlling the duty cycle of the pulse width modulated solenoid valve. The controller receives input from the suction line temperature sensing device as a basis for controlling the duty cycle. The suction line temperature sensing device may be a temperature sensor disposed on the suction line at the midpoint of the heat exchanger between the suction line and the liquid line. Alternatively, the suction line temperature sensing device may include a first temperature sensor disposed on the liquid line at one end of the heat exchanger and a second temperature sensor disposed on the liquid line at another end of the heat exchanger.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,838,037 Solenoid valve with supply voltage variation compensation | 25 | 1988 | |
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| 4,910,972 Refrigerator system with dual evaporators for household refrigerators | 32 | 1989 | |
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| 4,653,288 Apparatus for measuring refrigerant flow rate in refrigeration cycle | 25 | 1985 | |
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| 5,247,989 Modulated temperature control for environmental chamber | 16 | 1992 | |
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| 4,745,767 System for controlling flow rate of refrigerant | 47 | 1987 | |
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| 5,255,529 Environmental control system | 40 | 1992 | |
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| 5,255,530 System of two zone refrigerator temperature control | 44 | 1992 | |
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| 4,677,830 Air conditioning system for automotive vehicles | 43 | 1985 | |
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| 4,651,535 Pulse controlled solenoid valve | 42 | 1984 | |