JPS6441781A - Air conditioner - Google Patents

Abstract

PURPOSE: To enable the defrosting of an outdoor heat exchanger, and to preliminarily prevent the generation of ice columns or breakage of a pipe by arranging a defrosting pipe to flow a hot refrigerant in the defrosting mode on a lower part of the outdoor heat exchanger. CONSTITUTION: A part of the hot refrigerant from a compressor 5 flows to a defrosting pipe 3, and returns to the compressor 5 through an outdoor heat exchanger 1. The defrosting pipe 3 is thus heated, and the outdoor heat exchanger 1 is heated from a lower part, and a bottom plate 2 is heated from an upper part. Because the hot refrigerant passing through the defrosting pipe 3 flows in the outdoor heat exchanger 1, the outdoor heat exchanger 1 is heated both from inside and outside, and the frost adhered to the surface is melted. Though the drain water generated by melting the frost is stored on the bottom plate 2, no drain water is frozen or no residual ice is generated because the upper part of the bottom plate 2 is heated by the defrosting pipe 3. Thus, the defrosting of the outdoor heat exchanger 1 and the icing on the bottom plate 2 can be prevented, and the breakage of the pipe of the outdoor heat exchanger 1 caused by the icing of the drain water on the bottom plate 2 can be preliminarily prevented.