| 摘要 |
PURPOSE:To dispense with the returning of liquid refrigerant to a compressor to prevent its seizure by providing an electromagnetic valve on both a upstream and a downstream side of an air conditioning vaporizer respectively, and controlling the electromagnetic valves to make on-off interlocking at set period during simultaneous operation for both air conditioning and refrigeration. CONSTITUTION:A refrigerant compressor 1, a condenser 2 which condenses and liquidizes a high temperature-high pressure gas refrigerant, and a receiver 3 which separates the refrigerant into gaseous and liquid phases and leads out the liquid phase refrigerant are successively connected, and the downstream side of the receiver 3 is branched, and connected to decompression devices 5, 6 for air conditioning and refrigeration through the first and the second electromagnetic valve 41, 42 respectively. Vaporizers 7, 8 for air conditioning and refrigeration are connected onto the downstream sides of the decompression devices 5, 6 respectively, and the downstream side of the air conditioning vaporizer 7 and the refrigeration vaporizer 8 join on the upstream side of the compressor 1 through the third electromagnetic valve 43 and a check valve 9 respectively, and then are connected to the inlet port of the compressor 1. During simultaneous operation for both air conditioning and refrigeration, the first and the third electromagnetic valves 41, 42 are controlled to make on-off interlocking at period set so that the refrigerant flowing into the air conditioning vaporizer may amount to quantity which can completely vaporize. |
