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Title:
METHOD FOR DETECTING ABNORMALITY IN REFRIGERATION APPARATUS AND APPARATUS THEREFOR
Document Type and Number:
WIPO Patent Application WO/2012/164690
Kind Code:
A1
Abstract:
The present invention relates to the detection of abnormalities in a refrigeration apparatus comprising a refrigerant compressor configured so as to compress refrigerant and to discharge compressed refrigerant to a cooling piping constituting a refrigeration cycle, the refrigerant compressor being driven by an electric motor. First, an input current value A1(t) of the electric motor for driving the refrigerant compressor is detected, and a moving average current value A2(t), which is the average current value of every predetermined detection time, is calculated on the basis of the input current detection value. If a difference value ΔA between the moving average current value and the detected input current value exceeds a predetermined reference value β, an abnormality in the refrigerant compressor is determined to be present, thus detecting an abnormality in the refrigeration apparatus. With this configuration, it is possible to determine at an early stage that there is an abnormality due to a lack of lubrication to the refrigerant compressor, and to preemptively prevent a decline in the service life of the refrigerant piping, peripheral equipment connected thereto, or the like.

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Inventors:
OYAMA SADAO (JP)
NISHIDE MASAHIRO (JP)
Application Number:
PCT/JP2011/062508
Publication Date:
December 06, 2012
Filing Date:
May 31, 2011
Export Citation:
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Assignee:
HITACHI APPLIANCES INC (JP)
OYAMA SADAO (JP)
NISHIDE MASAHIRO (JP)
International Classes:
F04B49/10; H02P23/00
Foreign References:
JPH08130895A1996-05-21
JP2008061450A2008-03-13
JPS5959087A1984-04-04
JPH08234852A1996-09-13
JP2000356387A2000-12-26
JP2009074512A2009-04-09
JP2009142119A2009-06-25
JPH1162887A1999-03-05
JP2001280286A2001-10-10
JP2004039444A2004-02-05
Attorney, Agent or Firm:
POLAIRE I. P. C. (JP)
Polaire Intellectual Property Corporation (JP)
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