US 12,320,568 B2
Compressor unit and refrigeration apparatus
Takahiro Yamaguchi, Ostend (BE); and Yousuke Matsuda, Dubai (AE)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP); and DAIKIN EUROPE N.V., Ostend (BE)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP); and DAIKIN EUROPE N.V., Ostend (BE)
Filed on Mar. 3, 2022, as Appl. No. 17/685,622.
Application 17/685,622 is a continuation of application No. PCT/JP2019/034786, filed on Sep. 4, 2019.
Prior Publication US 2022/0186989 A1, Jun. 16, 2022
Int. Cl. F25B 7/00 (2006.01); F24F 11/36 (2018.01); F24F 13/20 (2006.01); F25B 40/00 (2006.01); F25B 40/02 (2006.01); F25B 40/06 (2006.01); F25B 49/00 (2006.01); F25B 49/02 (2006.01)
CPC F25B 7/00 (2013.01) [F24F 11/36 (2018.01); F24F 13/20 (2013.01); F25B 40/00 (2013.01); F25B 49/005 (2013.01); F25B 49/02 (2013.01); F25B 40/02 (2013.01); F25B 40/06 (2013.01); F25B 2400/054 (2013.01); F25B 2400/13 (2013.01); F25B 2500/222 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A refrigeration apparatus comprising:
a compressor unit comprising:
a first case;
a first compressor accommodated in the first case;
a cascade heat exchanger accommodated in the first case;
a second compressor accommodated in the first case;
a first connecting port;
a second connecting port;
a leakage detection sensor accommodated in the first case and configured to detect leakage of at least one of the first refrigerant or the second refrigerant;
a first liquid side shutoff valve configured to shutoff shift of the first refrigerant between the cascade heat exchanger and a heat source heat exchanger; and
a first gas side shutoff valve configured to shut off shift of the first refrigerant between the first compressor and the heat source hear exchanger;
a second liquid side shutoff valve configured to shut off shift of the second refrigerant between the cascade heat exchanger and a utilization heat exchanger;
a second gas side shutoff valve configure to shut off shift of the second refrigerant between the second compressor and the utilization heat exchanger; and
a controller configured to close the first liquid side shutoff valve, first gas side shutoff valve, second liquid side shutoff valve, and second gas side shutoff valve when the leakage detection sensor detects leakage,
a heat source heat exchanger unit including a second case and the heat source heat exchanger; and
a utilization unit including a third case and the utilization heat exchanger,
wherein
the first compressor, the cascade heat exchanger, the first liquid side shutoff valve, the first gas side shutoff valve, and the heat source heat exchanger constitute a first refrigerant cycle adopting the heat source heat exchanger as a heat source and configured to cause circulation of the first refrigerant, the heat source heat exchanger accommodated in the second case provided separately from the first case,
the second compressor, the cascade heat exchanger, the second liquid side shutoff valve, the second gas side shutoff valve, and the utilization heat exchanger constitute a second refrigerant cycle adopting the cascade heat exchanger as a heat source and configured to cause circulation of a second refrigerant, the utilization heat exchanger accommodated in the third case provided separately from the first case,
the cascade heat exchanger exchanges heat between the first refrigerant and the second refrigerant,
the first connecting port is connected to the heat source heat exchanger via a first connection piping,
the second connecting port is connected to the utilization heat exchanger via a second connection piping.