Refrigeration – Automatic control – Selective heating or cooling
Patent
1989-03-17
1990-04-03
King, Lloyd L.
Refrigeration
Automatic control
Selective heating or cooling
62174, 623241, 623246, 62470, 62503, F25B 1300
Patent
active
049129376
ABSTRACT:
An air conditioning apparatus comprises a switching valve for switching the flowing direction of a refrigerant discharged from a compressor to carry out either cooling operation, heating operation or defrosting operation; an outdoor heat exchanger for receiving the refrigerant supplied by the compressor through the switching valve to make the refrigerant heat exchange with air to be heat exchanged; an indoor heat exchanger for making the refrigerant heat exchange with a fluid to be heat exchanged; an oil separator which is arranged in a discharging side refrigerant pipe connecting the switching valve and the discharge port of the compressor to separate the refrigerant and a refrigerating machine oil which are discharged from the compressor; a first and second accumulators which are connected in series in an intake side refrigerant pipe connecting the switching valve and the intake port of the compressor; a first bypass passage for connecting the oil separator and the second accumulator through a solenoid valve; and a second bypass passage for connecting the oil separator and the intake port of the compressor through a metering device. As a result, the refrigeranting machine oil is returned to the compressor through the first bypass passage or the first and second bypass passages to prevent the compressor from failing due to shortage of the refrigeranting machine oil.
REFERENCES:
patent: 2590741 (1952-03-01), Watkins
patent: 2966043 (1960-12-01), Ross
patent: 3315484 (1967-04-01), Ross
patent: 3919859 (1975-11-01), Ross
patent: 4199960 (1980-04-01), Adams et al.
patent: 4266405 (1981-05-01), Trask
patent: 4557115 (1985-12-01), Nakamura
Igarashi Yoshinobu
Ishikawa Kouji
Nakamura Takashi
Tani Hidekazu
King Lloyd L.
Mitsubishi Denki & Kabushiki Kaisha
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