US 12,228,315 B2
Heat pump
Norihiro Okuda, Osaka (JP); Hideshi Okada, Osaka (JP); Sachie Tsujikawa, Osaka (JP); Terunori Aikawa, Osaka (JP); and Tomoya Yoshimura, Osaka (JP)
Assigned to YANMAR POWER TECHNOLOGY CO., LTD., Osaka (JP)
Appl. No. 17/913,999
Filed by Yanmar Power Technology Co., Ltd., Osaka (JP)
PCT Filed Mar. 4, 2021, PCT No. PCT/JP2021/008359
§ 371(c)(1), (2) Date Sep. 23, 2022,
PCT Pub. No. WO2021/192884, PCT Pub. Date Sep. 30, 2021.
Claims priority of application No. 2020-053960 (JP), filed on Mar. 25, 2020.
Prior Publication US 2023/0135687 A1, May 4, 2023
Int. Cl. F25B 31/00 (2006.01); F25B 30/02 (2006.01); F25B 41/20 (2021.01); F25B 43/02 (2006.01)
CPC F25B 31/004 (2013.01) [F25B 30/02 (2013.01); F25B 41/20 (2021.01); F25B 43/02 (2013.01); F25B 2400/0401 (2013.01); F25B 2500/06 (2013.01); F25B 2500/16 (2013.01); F25B 2500/26 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A heat pump comprising:
a compressor;
an oil separator provided in a discharge path of the compressor;
an accumulator connected to the compressor via a suction path; and
a first piping configured to deliver oil separated with the oil separator to the compressor, wherein:
the heat pump comprises a bypass circuit configured to deliver a gaseous refrigerant separated with the oil separator,
the bypass circuit is connected to the suction path,
the first piping is connected to the suction path above the accumulator in a vertical direction,
the suction path has an upward extending part extending upward, a downward extending part extending downward, and a connection part to connect the upward extending part and the downward extending part,
the upward extending part, the connection part, and the downward extending part are provided in the suction path in a stated order from an upstream side along a delivery direction of a refrigerant, and
the first piping is connected to the upward extending part.