Title:
REFRIGERATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2024/043317
Kind Code:
A1
Abstract:
The present invention provides a refrigeration device which is capable of switching between a single-stage operation and a dual-stage operation and which makes it possible to suppress heat leakage from a use-side apparatus to a refrigerant circuit-side via a heat exchanger that is in a state of not functioning as a heat exchanger due to a refrigerant not flowing. The present invention comprises: a high stage-side refrigerant circuit (2) in which a high stage-side heat transfer medium heat exchanger (11) and a cascade heat exchanger (13) that perform heat exchange with a heat transfer medium are sequentially connected via refrigerant piping; a low stage-side refrigerant circuit (3) in which the cascade heat exchanger (13), a low stage-side heat transfer medium heat exchanger (24) and a low stage-side heat exchanger (22) that are connected in parallel to the cascade heat exchanger (13) and that perform heat exchange with a heat transfer medium are sequentially connected via refrigerant piping; and a control unit (5) which controls the high stage-side refrigerant circuit (2) and the low stage-side refrigerant circuit (3). The control unit (5) is capable of switching between a single-stage operation and a dual-stage operation. The low stage-side heat transfer medium heat exchanger (24) is provided with low stage-side blockage means (40), (41). The high stage-side heat transfer medium heat exchanger (11) is provided with high stage-side blockage means (42), (43).
Inventors:
MAEMA YOSHINARI (JP)
Application Number:
PCT/JP2023/030580
Publication Date:
February 29, 2024
Filing Date:
August 24, 2023
Export Citation:
Assignee:
FUJITSU GENERAL LTD (JP)
International Classes:
F25B7/00; F25B1/00
Foreign References:
| JPH01212862A | 1989-08-25 | |||
| JP2017036882A | 2017-02-16 | |||
| JP2021148339A | 2021-09-27 | |||
| JPH04222355A | 1992-08-12 |
Attorney, Agent or Firm:
TANAKA Hidetetsu et al. (JP)
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