System for controlling flow rate of refrigerant

Details System for controlling flow rate of refrigerant System for controlling flow rate of refrigerant

1985-07-22

1987-06-23

Tanner, Harry

Refrigeration

Automatic control

Refrigeration producer

62225, F25B 4104

Patent

active

046742921

ABSTRACT:
A system for controlling the flow rate of a refrigerant for refrigeration cycles which comprises a 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: 3537272 (1970-11-01), Hales et al.
patent: 3877243 (1975-04-01), Kramer
patent: 4459818 (1984-07-01), Kaya et al.
patent: 4495779 (1985-01-01), Tanaka et al.
patent: 4506518 (1985-03-01), Yoshikawa et al.
patent: 4523435 (1985-06-01), Lord
patent: 4523436 (1985-06-01), Schedel et al.
patent: 4545210 (1985-10-01), Lord

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