US 12,320,565 B2
Refrigeration cycle device
Masanori Sato, Tokyo (JP); Takumi Nishiyama, Tokyo (JP); and Kenta Murata, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 17/798,933
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Apr. 7, 2020, PCT No. PCT/JP2020/015671
§ 371(c)(1), (2) Date Aug. 11, 2022,
PCT Pub. No. WO2021/205539, PCT Pub. Date Oct. 14, 2021.
Prior Publication US 2023/0067007 A1, Mar. 2, 2023
Int. Cl. F25B 43/00 (2006.01); C09K 5/04 (2006.01); F25B 1/00 (2006.01); F25B 41/31 (2021.01)
CPC F25B 43/00 (2013.01) [C09K 5/044 (2013.01); F25B 1/00 (2013.01); F25B 41/31 (2021.01); C09K 2205/122 (2013.01); C09K 2205/126 (2013.01); C09K 2205/24 (2013.01); F25B 2500/18 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A refrigeration cycle device comprising:
a refrigerant circuit which circulates a mixed refrigerant containing at least CF3I and HFO1123, the refrigerant circuit including a compressor, at least one expansion valve, an indoor heat exchanger, an outdoor heat exchanger, and a refrigerant reservoir;
an injection pipe which includes a first end at a first height within the refrigerant reservoir and a second end connected to the compressor; and
an injection valve included in the injection pipe, wherein
the CF3I has a greatest fluid density among refrigerants contained in the mixed refrigerant, and
the first height is lower than a height at which an end of a refrigerant pipe, other than the injection pipe, is located within the refrigerant reservoir,
wherein
the refrigerant circuit further includes:
a flow switch;
a first refrigerant pipe connecting a discharge side of the compressor and a first opening of the flow switch,
a second refrigerant pipe connecting the outdoor heat exchanger and a second opening of the flow switch,
a third refrigerant pipe connecting a suction side of the compressor and a third opening of the flow switch,
a fourth refrigerant pipe connecting the indoor heat exchanger and a fourth opening of the flow switch, and
a fifth refrigerant pipe having a first end at a second height within the refrigerant reservoir and a second end connected to the outdoor heat exchanger, wherein
the second height is higher than the first height, and
the fifth refrigerant pipe includes the expansion valve.
 
2. A refrigeration cycle device comprising:
a refrigerant circuit which circulates a mixed refrigerant containing at least CF3I and HFO1123, the refrigerant circuit including a compressor, at least one expansion valve, an indoor heat exchanger, an outdoor heat exchanger, and a refrigerant reservoir;
an injection pipe which includes a first end at a first height within the refrigerant reservoir and a second end connected to the compressor; and
an injection valve included in the injection pipe, wherein
the CF3I has a greatest fluid density among refrigerants contained in the mixed refrigerant, and
the first height is lower than a height at which an end of a refrigerant pipe, other than the injection pipe, is located within the refrigerant reservoir, wherein
the refrigerant circuit further includes:
a flow switch;
a first refrigerant pipe connecting a discharge side of the compressor and a first opening of the flow switch,
a second refrigerant pipe connecting the outdoor heat exchanger and a second opening of the flow switch,
a third refrigerant pipe connecting a suction side of the compressor and a third opening of the flow switch, and
a fourth refrigerant pipe connecting the indoor heat exchanger and a fourth opening of the flow switch,
a sixth refrigerant pipe having a first end at a third height within the refrigerant reservoir and a second end connected to the indoor heat exchanger, wherein
the third height is higher than the first height.
 
4. A refrigeration cycle device comprising:
a refrigerant circuit which circulates a mixed refrigerant containing at least CF3I and HFO1123, the refrigerant circuit including a compressor, at least one expansion valve, an indoor heat exchanger, an outdoor heat exchanger, and a refrigerant reservoir;
an injection pipe which includes a first end at a first height within the refrigerant reservoir and a second end connected to the compressor; and
an injection valve included in the injection pipe,
wherein
the CF3I has a greatest fluid density among refrigerants contained in the mixed refrigerant, and
the first height is lower than a height at which an end of a refrigerant pipe, other than the injection pipe, is located within the refrigerant reservoir, wherein
the refrigerant circuit further includes:
a flow switch;
a first refrigerant pipe connecting a discharge side of the compressor and a first opening of the flow switch,
a second refrigerant pipe connecting the outdoor heat exchanger and a second opening of the flow switch,
a third refrigerant pipe connecting a suction side of the compressor and a third opening of the flow switch, and
a fourth refrigerant pipe connecting the indoor heat exchanger and a fourth opening of the flow switch, wherein
the at least one expansion valve includes a first expansion valve and a second expansion valve;
the refrigerant circuit further includes:
a fifth refrigerant pipe having a first end at a second height within the refrigerant reservoir and a second end connected to the outdoor heat exchanger; and
a sixth refrigerant pipe having a first end at a third height within the refrigerant reservoir and a second end connected to the indoor heat exchanger, wherein
the fifth refrigerant pipe includes the first expansion valve,
the sixth refrigerant pipe includes the second expansion valve,
the second height is higher than the first height, and
the third height is higher than the first height.