Title:
REFRIGERATION CYCLE DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/264345
Kind Code:
A1
Abstract:
In this refrigeration cycle device, a compressor, an oil separator, a condenser, a first expansion valve, and an evaporator are cyclically connected by first refrigerant piping, and a refrigerant circulates through the refrigeration cycle device, wherein: the refrigeration cycle device comprises second refrigerant piping that is connected to the compressor and that branches from the first refrigerant piping between the condenser and the first expansion valve, oil piping that is connected to the oil separator and the compressor and that has flowing therethrough oil separated by the separator, an oil cooler that is provided to the second piping, that cools the oil flowing through the oil piping by using the refrigerant flowing through the second refrigerant piping, and that discharges to the compressor, a second expansion valve that is provided in the second refrigerant piping between the condenser and the oil cooler, a discharge temperature sensor that is provided in the first refrigerant piping on the discharge side of the compressor, and a control device that controls the second expansion valve; the control device controls the aperture of the second expansion valve such that the discharge temperature of the compressor based on the result of detection by the discharge temperature sensor reaches a temperature within a predetermined temperature range; the temperature range has a first threshold value as an upper-limit value and has a second threshold value as a lower-limit value; and the first threshold value is a temperature that is lower, by a predetermined first set temperature, than a protection threshold value serving as a reference for stopping the compressor when reached by the discharge temperature.
Inventors:
MAEDA KATSUYA (JP)
MATSUO MITSUAKI (JP)
KAMIKAWA MASAAKI (JP)
MATSUO MITSUAKI (JP)
KAMIKAWA MASAAKI (JP)
Application Number:
PCT/JP2021/022981
Publication Date:
December 22, 2022
Filing Date:
June 17, 2021
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
F25B1/00
Domestic Patent References:
| WO2016117037A1 | 2016-07-28 |
Foreign References:
| JP2013253734A | 2013-12-19 | |||
| JP2020076108A | 2020-05-21 | |||
| JP2010133401A | 2010-06-17 | |||
| JP2002286302A | 2002-10-03 | |||
| JP2009300008A | 2009-12-24 | |||
| JPH1183247A | 1999-03-26 |
Attorney, Agent or Firm:
KISA PATENT & TRADEMARK FIRM (JP)
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