Title:
TWO-STAGE REFRIGERATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/189382
Kind Code:
A1
Abstract:
Provided is a two-stage refrigeration device that starts up quickly and suppresses reductions in compressor reliability as well as increases in power consumption. The present invention comprises: a high-side refrigerant circuit (2) that includes a high-side first circulation path (17) that connects, in order, a high-side compressor (10), a high-side heat exchanger (11), a high-side expansion valve (12), and a cascade heat exchanger (13) at which heat is exchanged between a high-side refrigerant and a low-side refrigerant; and a low-side refrigerant circuit (3) that connects, in order, a low-side compressor (20), the cascade heat exchanger (13), a low-side expansion valve (21), and a heat source–side heat exchanger (22). The high-side refrigerant circuit (2) also includes: a high-side second circulation path (18) that connects the discharge and intake sides of the high-side compressor (10) via a high-side bypass path (15) and circulates high-side refrigerant discharged from the high-side compressor (10) through the high-side bypass path (15) to the intake side of the high-side compressor (10); and a high-side opening/closing valve (16) that switches the high-side first circulation path (17) or the high-side second circulation path (18).
Inventors:
NAKATA SHOHEI (JP)
MAEMA YOSHINARI (JP)
KANEI KAZUKI (JP)
MAEMA YOSHINARI (JP)
KANEI KAZUKI (JP)
Application Number:
PCT/JP2023/009142
Publication Date:
October 05, 2023
Filing Date:
March 09, 2023
Export Citation:
Assignee:
FUJITSU GENERAL LTD (JP)
International Classes:
F25B7/00; F25B1/00
Domestic Patent References:
| WO2014112615A1 | 2014-07-24 | |||
| WO2016147305A1 | 2016-09-22 |
Foreign References:
| JPH07243711A | 1995-09-19 | |||
| JP2004177046A | 2004-06-24 |
Attorney, Agent or Firm:
TANAKA Hidetetsu et al. (JP)
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