US 12,352,477 B2
Refrigeration apparatus-use unit, heat source unit, and refrigeration apparatus
Masaaki Takegami, Osaka (JP); and Shuuichi Taguchi, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Sep. 21, 2021, as Appl. No. 17/480,777.
Application 17/480,777 is a continuation of application No. PCT/JP2020/003763, filed on Jan. 31, 2020.
Claims priority of application No. 2019-066036 (JP), filed on Mar. 29, 2019.
Prior Publication US 2022/0003463 A1, Jan. 6, 2022
Int. Cl. F25B 13/00 (2006.01); F25B 41/20 (2021.01); F25B 41/24 (2021.01); F25B 41/26 (2021.01)
CPC F25B 41/24 (2021.01) [F25B 13/00 (2013.01); F25B 41/20 (2021.01); F25B 41/26 (2021.01); F25B 2313/007 (2013.01); F25B 2313/0231 (2013.01); F25B 2313/0233 (2013.01); F25B 2313/02732 (2013.01); F25B 2313/02741 (2013.01); F25B 2313/0291 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A refrigeration apparatus-use unit for a refrigeration apparatus including a refrigerant circuit configured to perform a refrigeration cycle in which a pressure above a critical pressure is applied to a refrigerant,
the refrigeration apparatus-use unit comprising
a switching mechanism configured to switch a flow path of the refrigerant in the refrigerant circuit,
wherein
the switching mechanism includes:
an electric motor;
a flow path switching portion to be driven by the electric motor;
a first port connected to a high-pressure flow path of the refrigerant circuit;
a second port connected to a low-pressure flow path of the refrigerant circuit; and
a third port connected to a predetermined flow path of the refrigerant circuit,
the switching mechanism is switched to a first state in which the first port communicates with the third port or a second state in which the second port communicates with the third port in such a manner that the electric motor drives the flow path switching portion,
the switching mechanism comprises an electrically driven three-way valve,
the three-way valve comprises a first three-way valve and a second three-way valve,
the first port of the first three-way valve is connected to a discharge side of a compression unit,
the second port of the first three-way valve is connected to a suction side of the compression unit,
the third port of the first three-way valve is connected to a gas end of a utilization-side heat exchanger,
the first port of the second three-way valve is connected to the discharge side of the compression unit,
the second port of the second three-way valve is connected to the suction side of the compression unit,
the third port of the second three-way valve is connected to a gas end of a heat source-side heat exchanger,
the compression unit includes a cooling facility-side compressor and an indoor-side compressor, which are in parallel to each other,
a suction side of the cooling facility-side compressor is connected to a gas end of a cooling facility heat exchanger, and
a suction side of the indoor-side compressor is connected to both the second port of the first three-way valve and the second port of the second three-way valve.
 
4. A heat source unit for a refrigeration apparatus including a refrigerant circuit configured to perform a refrigeration cycle in which a pressure above a critical pressure is applied to a refrigerant,
the heat source unit comprising:
the refrigeration apparatus-use unit according to claim 1;
the compression unit; and
the heat source-side heat exchanger.
 
10. A refrigeration apparatus comprising:
a refrigerant circuit configured to perform a refrigeration cycle in which a pressure above a critical pressure is applied to a refrigerant; and
the refrigeration apparatus-use unit according to claim 1.
 
11. A refrigeration apparatus comprising:
a refrigerant circuit configured to perform a refrigeration cycle in which a pressure above a critical pressure is applied to a refrigerant; and
the heat source unit according to claim 4.