TIMER OF REFRIGERATORS DEFROSTING Russian patent published in 2009 - IPC H01H43/10 F25D21/08 

FIELD: mechanics.

SUBSTANCE: invention refers to automatics. Refrigerator defrosting timer includes power supply, timer, heater, defrosting finish sensor, compressor, rectifier, extinguishing element, voltage suppressor, threshold element, three-pin electromagnetic relay movable contact of which is connected to power supply second pole. Common leg of timer is connected with first fixed relay contact and through compressor - with power supply first pole. Timer inverting input is connected with second fixed relay contact through heater and with power supply first pole through defrosting finish sensor. Timer output is connected with second fixed relay contact through two series-connected circuits. On one side the first circuit is formed by series-connected relay winding and threshold element, on the other side the second circuit is formed by series-connected rectifier and extinguishing element. The first and the second circuit common point is connected with timer common leg through voltage suppressor. According to the second version the device includes power supply, timer, heater, defrosting finish sensor, compressor, rectifier, extinguishing element, voltage suppressor, three-pin electromagnetic relay movable contact of which is connected to power supply second pole. Common leg of timer is connected with first fixed relay contact and through compressor - with power supply first pole. Timer inverting input is connected with second fixed relay contact through heater and with power supply first pole through defrosting finish sensor. Timer output is connected with relay winding first output, the second output of which is connected with second fixed relay contact through series-connected rectifier and extinguishing element. Common point of relay winding second output and circuit formed by series-connected rectifier and extinguishing element is connected with timer common leg through voltage suppressor. Timer has additional control input connected with voltage suppressor. Timer receives a signal about power in the circuit after emergency shutdown through this additional input.

EFFECT: creation of refrigerator defrosting timer.

7 cl, 7 dwg