Title:
REFRIGERANT SHORTAGE DETECTING METHOD AND APPARATUS FOR AIR-CONDITIONERS
Document Type and Number:
WIPO Patent Application WO/1993/020393
Kind Code:
A1
Abstract:
A refrigerant sensor adapted to generate an output in accordance with its quantity of contact with a liquid phase refrigerant is provided in an intermediate portion of a refrigerant circulating closed circuit in an air-conditioner, and the rotational speed of a compressor is detected, a judgement value set in accordance with this rotational speed and an output value from the refrigerant sensor being compared with each other to detect the shortage of the refrigerant. Owing to this structure, even when the liquid level of the refrigerant in the refrigerant sensor varies in accordance with an increase in the rotational speed of the compressor to cause an output the level of which is higher than that of an actual filling quantity of the refrigerant to be generated, a judgement value in proportion to this output level is set, and the shortage of the refrigerant can therefore be detected accurately. This can reliably prevent the occurrence of seizure, which is ascribed to the shortage of refrigerant, of the compressor.
Inventors:
KURIBARA MASARU (JP)
KOBAYASHI KAZUMITSU (JP)
KOBAYASHI KAZUMITSU (JP)
Application Number:
PCT/JP1993/000409
Publication Date:
October 14, 1993
Filing Date:
March 31, 1993
Export Citation:
Assignee:
UNISIA JECS CORP (JP)
KURIHARA MASARU (JP)
KOBAYASHI KAZUMITSU (JP)
KURIHARA MASARU (JP)
KOBAYASHI KAZUMITSU (JP)
International Classes:
F25B49/00; G01F23/00; F25B49/02; G01F23/24; (IPC1-7): F25B49/02
Foreign References:
| JPH04217762A | 1992-08-07 | |||
| JPS6117876A | 1986-01-25 | |||
| JPS5664261A | 1981-06-01 | |||
| JPH03294771A | 1991-12-25 | |||
| JPS5428050A | 1979-03-02 |
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