US 12,253,277 B2
Air conditioner
Atsushi Yoshimi, Osaka (JP); Takuro Yamada, Osaka (JP); Eiji Kumakura, Osaka (JP); Ikuhiro Iwata, Osaka (JP); and Takeru Miyazaki, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Mar. 25, 2022, as Appl. No. 17/704,250.
Application 17/704,250 is a continuation of application No. PCT/JP2020/036083, filed on Sep. 24, 2020.
Claims priority of application No. 2019-180831 (JP), filed on Sep. 30, 2019.
Prior Publication US 2022/0214056 A1, Jul. 7, 2022
Int. Cl. F24F 3/06 (2006.01); F25B 25/00 (2006.01); F25B 29/00 (2006.01)
CPC F24F 3/06 (2013.01) [F25B 25/005 (2013.01); F25B 29/003 (2013.01); F24F 2203/021 (2013.01); F25B 2313/02743 (2013.01); F25B 2400/06 (2013.01); F25B 2600/02 (2013.01); F25B 2600/13 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An air conditioner comprising:
use-side units that are each switchable between a cooling operation and a heating operation; and
a heat-source-side unit comprising:
a lower-stage compressor and a higher-stage compressor;
a discharge pipe to which a refrigerant is discharged after being compressed by the higher-stage compressor;
a first main heat-source-side flow path and a second main heat-source-side flow path that branch off from the discharge pipe;
a first heat-source-side heat exchanger;
a second heat-source-side heat exchanger;
a first economizer heat exchanger; and
a second economizer heat exchanger, wherein
the first heat-source-side heat exchanger is connected to the first economizer heat exchanger in series in the first main heat-source-side flow path,
the second heat-source-side heat exchanger is connected to the second economizer heat exchanger in series in the second main heat-source-side flow path,
the heat-source-side unit further comprises:
a first economizer pipe that branches off from the first main heat-source-side flow path and extends toward the lower-stage and higher-stage compressors; and
a second economizer pipe that branches off from the second main heat-source-side flow path and extends toward the lower-stage and higher-stage compressors,
the first economizer heat exchanger exchanges heat between the refrigerant flowing in the first main heat-source-side flow path and the refrigerant flowing in the first economizer pipe,
the second economizer heat exchanger exchanges heat between the refrigerant flowing in the second main heat-source-side flow path and the refrigerant flowing in the second economizer pipe,
the heat-source-side unit further comprises a common part,
the common part is disposed:
between the first main heat-source-side flow path and the first economizer heat exchanger in the first economizer pipe, and
between the second main heat-source-side flow path and the second economizer heat exchanger in the second economizer pipe, and
the common part comprises an expansion valve that is common to the first economizer pipe and the second economizer pipe.