COLD SOURCE UNIT AND REFRIGERATION CYCLE DEVICE

Title:

COLD SOURCE UNIT AND REFRIGERATION CYCLE DEVICE

Document Type and Number:

WIPO Patent Application WO/2022/085112

Kind Code:

A1

Abstract:

A cold source unit (5) can be connected to an indoor heat exchanger (70) and makes up a refrigerant circuit (4). The cold source unit (5) comprises: a compressor (10); an outdoor heat exchanger (30) that includes a gas header (31); an oil return pathway for returning a refrigerant oil to the compressor (10) from the gas header (31); an oil return adjustment unit (50) that adjusts the flow volume of the refrigerant oil flowing through the oil return pathway; and a control device (6) that controls the refrigerant circuit (4). The control device (6) controls the oil return adjustment unit (50) to prevent the refrigerant oil from flowing through the oil return pathway when the compressor (10) is being driven at a frequency at or above a threshold value, and controls the oil return adjustment unit (50) to allow the refrigerant oil to flow through the oil return pathway when the compressor (10) is being driven at a frequency less than the threshold value.

Inventors:

NAGATA RYUICHI (JP)

Application Number:

PCT/JP2020/039541

Publication Date:

April 28, 2022

Filing Date:

October 21, 2020

Export Citation:

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Assignee:

MITSUBISHI ELECTRIC CORP (JP)

International Classes:

F25B1/00; F25B39/00; F25B39/02; F25B39/04

Domestic Patent References:

WO2014196045A1

2014-12-11

Foreign References:

JP2014109416A	2014-06-12
JP2018004106A	2018-01-11
JPH08121885A	1996-05-17
JPH04251163A	1992-09-07
JPH031049A	1991-01-07
JP2011208860A	2011-10-20
JPS62276368A	1987-12-01
JP2000304378A	2000-11-02

Other References: