JPWO2021048901A5 - - Google Patents

Description

The first flow path F1 from the refrigerant inlet port PI2 to the refrigerant outlet port PO2 via the first passage H1 of the compressor 10, the condenser 20, and the heat exchanger 30 is the first expansion valve 50 of the load device 3 and evaporation. Together with the flow path in which the vessel 60 is arranged, a circulation flow path through which the refrigerant circulates is formed. Hereinafter, this circulation flow path is also referred to as a "main refrigerant circuit" of the refrigeration cycle.

The outdoor unit 2 has pipes 91, 92, 94 for flowing the refrigerant from the portion between the outlet of the first passage H1 and the refrigerant outlet port PO2 of the circulation flow path to the inlet of the second passage H2, and the second passage H2. Further, a pipe 96 for flowing a refrigerant from the outlet to the intermediate pressure port G3 of the compressor 10 is provided. In the following, the second flow path F2 that branches from the main refrigerant circuit and sends the refrigerant to the compressor 10 via the second passage H2 is also referred to as an “injection flow path”.

It is not always necessary, but preferably, the control device 100 further increases the rotation speed of the compressor 10 in step S45 . As a result, it is possible to shorten the time for recovering the remaining refrigerant, which has been recovered and is difficult to condense.

1 Refrigeration cycle device, 2 Outdoor unit, 3 Load device, 10 Compressor, 20 Condenser, 22 Fan, 28 On-off valve, 30 Heat exchanger, 71 Second expansion valve, 50 First expansion valve, 60 Evaporator, 70 Squeezing device, 72 flow control valve, 73 receiver , 80,81,82,83,84,85,88,89,91,92,94,96 piping, 93 degassing piping, 100 control device, 104 memory , 110,111 Pressure sensor, 120,121,122,123 Temperature sensor, F1 1st flow path, F2 2nd flow path, G1 suction port, G2 discharge port, G3 intermediate pressure port, H1 1st passage, H2 2nd flow path aisle.