Defrosting device for a refrigerant evaporator

摘要

The evaporator of the invention is of refrigerator plants arranged in a complex, with a compressor, a condenser, several cooling places and, connected to follow these, expansion valves and evaporators, and also with two-way magnetic valves for the passage of heated gaseous refrigerant through the evaporator oppositely to the normal cooling operation, there being inserted, in parallel with the expansion valves, a respective non-return valve which blocks in normal cooling operation, and before the liquefier a feed duct to the two-way magnetic valves and a shut-off valve. The cooling places are provided with defrosting water ducts and troughs. Here a heater is connected in front of each two-way magnetic valve and is formed by a duct which is in heat exchange with the defrosting water ducts and troughs, in order to prevent high temperatures and to prevent the icing of the defrosting water drain troughs and ducts.