Refrigeration – Automatic control – Refrigeration producer
Patent
1987-02-19
1987-11-17
Tanner, Harry B.
Refrigeration
Automatic control
Refrigeration producer
62210, F25B 4104
Patent
active
047064692
ABSTRACT:
A refrigerant flow control system associated with a refrigerant circulating circuit having a compressor, a condenser, an expansion valve and an evaporator, includes a branch pipe extending from a discharge pipe of the compressor and having on sealed free end. A first temperature sensor is disposed on the branch pipe near the sealed free end for detecting a condensation temperature of a refrigerant which is condensed in the branch pipe. A second temperature sensor is disposed on the discharge pipe of the compressor for detecting a temperature of the gaseous refrigerant discharged from the compressor. The signals representative of the condensation temperature and the temperature of the discharge gaseous refrigerant are inputted to a control device. The control device calculates a difference between the two detected temperatures, and a degree of superheat of the discharged gaseous refrigerant and transfers to the expansion valve a command signal representative of the calculation results, thereby controlling an opening of the expansion valve.
REFERENCES:
patent: 2524913 (1950-10-01), Lathrop
patent: 4261180 (1981-04-01), Nozawa et al.
patent: 4362027 (1982-12-01), Barbier
patent: 4517811 (1985-05-01), Atsumi et al.
patent: 4620424 (1986-11-01), Tanaka et al.
Etou Hironori
Ishibane Kyuhei
Kuroda Shigeaki
Oguni Kensaku
Sano Takashi
Hitachi , Ltd.
Tanner Harry B.
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