Refrigeration – Automatic control – Refrigeration producer
Patent
1987-03-10
1988-05-24
Tanner, Harry B.
Refrigeration
Automatic control
Refrigeration producer
62212, 62225, F25B 4104
Patent
active
047457678
ABSTRACT:
A system for controlling the flow rate of a refrigerant for refrigeration cycles which comprises an electronic expansion valve disposed at the inlet of an evaporator and a controller for controlling the opening-closing movement of the valve. The controller comprises a calculating unit for comparing the degree of superheat of the refrigerant measured at the evaporator with a preset degree of superheat and feeding a valve opening adjusting signal to the valve according to the value obtained by the comparison, and a valve full-closing signal generator for comparing the measured temperature of the space to be cooled with a preset temperature and feeding a valve full-closing signal to the valve based on the value obtained from the comparison of temperatures, in preference to the opening adjusting signal.
REFERENCES:
patent: 3877243 (1975-04-01), Kramer
patent: 4459818 (1984-07-01), Kaya et al.
patent: 4523436 (1985-06-01), Schedel et al.
Hoshi Katsuhiko
Ohya Satoshi
Sanyo Electric Co,. Ltd.
Tanner Harry B.
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