Title:
REFRIGERATION CYCLE DEVICE
Document Type and Number:
WIPO Patent Application WO/2024/071213
Kind Code:
A1
Abstract:
This refrigeration cycle device (1) comprises a first circuit (5a), a second circuit (10), a cascade heat exchanger (35), and a control unit (80). A first refrigerant circulates through the first circuit (5a). A carbon dioxide refrigerant and a refrigeration machine oil circulate through the second circuit (10). The cascade heat exchanger (35) heats the carbon dioxide refrigerant with the first refrigerant. The second circuit (10) has a second compressor (21) and a container. The container is provided on the intake side of the second compressor (21). The container stores the carbon dioxide refrigerant and the refrigeration machine oil. The control unit (80) controls the operation of the first circuit (5a) so that the pressures or temperatures of the carbon dioxide refrigerant and the refrigeration machine oil inside the container are at least a predetermined pressure or a predetermined temperature which corresponds to a boundary temperature at which the density of the carbon dioxide refrigerant and the density of the refrigeration machine oil in the container become the same.
Inventors:
IYOSHI YUTA
YAMANOI YOSHIKI
YAMANOI YOSHIKI
Application Number:
PCT/JP2023/035186
Publication Date:
April 04, 2024
Filing Date:
September 27, 2023
Export Citation:
Assignee:
DAIKIN IND LTD (JP)
International Classes:
F25B13/00; F25B1/00; F25B7/00
Domestic Patent References:
| WO2021225177A1 | 2021-11-11 | |||
| WO2021210064A1 | 2021-10-21 |
Foreign References:
| JP2003262418A | 2003-09-19 | |||
| CN110608539A | 2019-12-24 |
Attorney, Agent or Firm:
SHINJYU GLOBAL IP (JP)
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