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Patent Searching and Data


Title:
HEAT SOURCE UNIT AND FREEZING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2021/033426
Kind Code:
A1
Abstract:
According to the present invention, an oil recovery operation comprises a first operation of reducing the opening degree of a heat source expansion valve (28) and a second operation of increasing the opening degree of the heat source expansion valve (28) after the first operation. A controller (80) is configured to execute the second operation when a first condition is satisfied during the first operation. The first condition includes at least a condition in which a difference ΔP between the pressure of a refrigerant on the downstream side of the heat source expansion valve (28) in a liquid pipe (43) and the pressure of a suction refrigerant of a compression element (C) is smaller than a predetermined value.

Inventors:
SAKAE SATORU (JP)
KONDOU AZUMA (JP)
Application Number:
PCT/JP2020/025197
Publication Date:
February 25, 2021
Filing Date:
June 26, 2020
Export Citation:
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Assignee:
DAIKIN IND LTD (JP)
International Classes:
F25B1/00
Foreign References:
JP2018084376A2018-05-31
JP2011027314A2011-02-10
JP2015124893A2015-07-06
Attorney, Agent or Firm:
MAEDA & PARTNERS (JP)
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