Refrigeration – Automatic control – Selective heating or cooling
Patent
1998-11-05
1999-12-07
Bennett, Henry
Refrigeration
Automatic control
Selective heating or cooling
62159, 62174, 62225, 62509, F25B 1300
Patent
active
059963603
ABSTRACT:
A refrigerant cycle system includes a gas-liquid separator for separating gas-liquid refrigerant into gas refrigerant and liquid refrigerant. The gas-liquid separator has a liquid-suction pipe for introducing liquid refrigerant from the gas-liquid separator to a decompressing unit, and a gas-suction pipe for introducing gas refrigerant from the gas-liquid separator to a compressor. The gas-suction pipe has a suction hole for sucking liquid refrigerant therein, and the suction hole is provided at a position lower than an open end of the liquid-suction pipe. Because a height of a surface of liquid refrigerant in the gas-liquid separator is constantly equal to or higher than the open end of the liquid-suction pipe regardless of change in a heating load of the refrigerant cycle, liquid refrigerant is constantly sucked into the gas-suction pipe from the suction hole. Thus, liquid refrigerant in which lubricating oil is dissolved can be constantly introduced into the compressor, thereby preventing shortage of lubricating oil in the compressor. On the other hand, in the refrigerant cycle, an oil-discharging mode is selectively set at a starting time of a heating mode so that lubricating oil staying in an evaporator is discharged. Therefore, lubricating oil is sufficiently returned to the compressor even when the heating mode is switched from a cooling mode.
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Iritani Kunio
Ishikawa Hiroshi
Itoh Satoshi
Tanaka Masaya
Bennett Henry
Denso Corporation
Norman Marc
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