Title:
REFRIGERATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/058542
Kind Code:
A1
Abstract:
Provided is a refrigeration device which comprises: a refrigerant circuit formed by connecting a compressor, a condenser, a decompression device, and an evaporator by means of refrigerant piping; a discharge pressure sensor which detects a discharge pressure that is the pressure of a refrigerant discharged from the compressor; and a control device which controls the refrigerant circuit. The control device includes a storage unit which stores: a high pressure calculation formula for obtaining an upper limit high pressure, the high pressure calculation formula being a linear function using an evaporation temperature of the refrigerant circuit as a variable; and a frequency calculation formula for obtaining an upper limit frequency, the frequency calculation formula being a quadratic function using the evaporation temperature as a variable. Furthermore, the control device includes: a calculation unit which obtains the upper limit high pressure and the upper limit frequency using the high pressure calculation formula and the frequency calculation formula; a high pressure determination unit which determines whether or not the discharge pressure is greater than the upper limit high pressure; and an operation control unit which reduces the operating frequency of the compressor to the upper limit frequency when the discharge pressure is greater than the upper limit high pressure.
Inventors:
UEDA KOHEI (JP)
Application Number:
PCT/JP2017/034464
Publication Date:
March 28, 2019
Filing Date:
September 25, 2017
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
F25B1/00
Foreign References:
| JPH06147688A | 1994-05-27 | |||
| JP2000039220A | 2000-02-08 | |||
| JP2007322036A | 2007-12-13 | |||
| JP2014196893A | 2014-10-16 | |||
| JPH01139965A | 1989-06-01 | |||
| JPH04106357A | 1992-04-08 |
Attorney, Agent or Firm:
KISA PATENT & TRADEMARK FIRM (JP)
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