Sanyo Electric Co., Ltd.

Hirotaka Nakano

Ken Aoki

Hiroyuki Kuribara

Takashi Takizawa

Hisao Sagara

Hirokuni Tamai

Kiyoshi Ohshimizu

The object of the present invention is to provide a defrosting device, for a low temperature display case, that can effectively prevent incomplete defrosting, and that can reduce the temperature increase in a storage chamber during defrosting to the minimum. According to the present invention, a defrosting device comprises: defrosting heaters provided in a duct; a first defrost recovery temperature sensor for detecting an air temperature in the duct; a second defrost recovery temperature sensor for detecting a temperature at the evaporator; and a controller for, during a defrosting operation for the evaporator, rendering the defrosting heaters conductive, supplying a high temperature refrigerant to the evaporator, and for rendering the defrosting heaters nonconductive, based on an output of the first defrost recovery temperature sensor, and halting a flow of the high temperature refrigerant to the evaporator, based on an output of the second defrost recovery temperature sensor.

Defrosting device for a low temperature display case

The refrigeration apparatus according to the invention has a main refrigeration line comprising a compressor, a condenser which are installed outdoor, and a decompression device, an evaporator and a refrigerant flow rate control valve which are installed indoor, all connected in a loop. The main refrigerant line is provided with an auxiliary refrigerant line that connects the input side of the decompression device in the main refrigerant line with the inlet side of the compressor via a bypass valve. The lowering in the suction pressure of the compressor is detected if it happens, and the pressure is restored by opening the bypass valve by throttling the refrigerant flow rate control valve, so that the compressor may be kept on running.

Refrigeration apparatus

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Gunma, Japan

Hirotaka Nakano