Heat pump

Patent metadata

Field	Value
Publication number	US-2023135687-A1
Application number	US-202117913999-A
Country	US
Kind code	A1
Filing date	Mar 4, 2021
Priority date	Mar 25, 2020
Publication date	May 4, 2023
Grant date	—

Abstract

A heat pump is provided with a compressor; an oil separator provided on a discharge path of the compressor; an accumulator connected to the compressor via a suction path; and a bypass circuit configured to supply a gas refrigerant separated by the oil separator. The bypass circuit is connected to the suction path.

First claim

1 . A heat pump comprising:
a compressor; an oil separator provided in a discharge path of the compressor; and an accumulator connected to the compressor via a suction path, wherein:
the heat pump comprises a bypass circuit configured to deliver a gaseous refrigerant separated with the oil separator, and
the bypass circuit is connected to the suction path.

2 . The heat pump according to claim 1 , wherein:
a valve is provided in the bypass circuit, and the valve is configured to be controlled so that a degree of opening of the valve is decreased over time after the heat pump is started.

3 . The heat pump according to claim 1 further comprising:
a first piping configured to deliver oil separated with the oil separator to the compressor, and
wherein the first piping is connected to the suction path above the accumulator in a vertical direction.

4 . The heat pump according to claim 3 , wherein:
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.

5 . The heat pump according to claim 4 , wherein:
the suction path has a plurality of paths and a branch part that connects to the plurality of paths, a second piping configured to return oil to the accumulator is connected to the branch part, and the second piping is connected to the suction path below the first piping in the vertical direction.

6 . The heat pump according to claim 5 , wherein a filter is housed in the branch part.

7 . The heat pump according to claim 6 further comprising:
an oil path through which oil delivered from the oil separator flows; and
an oil sensor configured to detect an amount of oil flowing through the oil path, and
wherein the oil path is connected to the bypass circuit.

Assignees

• Yanmar Power Technology Co Ltd

Inventors

• Okuda Norihiro
• Okada Hideshi
• Tsujikawa Sachie
• Aikawa Terunori
• Yoshimura Tomoya

Classifications

• F25B2600/2519

  On-off valves · CPC title

• F25B2500/26

  characterised by the startup of the refrigeration cycle · CPC title

• F25B31/004 Primary

  oil recirculating arrangements · CPC title

• F25B2327/001

  Mechanical Engineering · mapped topic

• F25B2500/16

  Lubrication · CPC title