VENTILATOR OF THE HEAT EXCHANGE TYPE

PURPOSE:To enable simultaneous sucking and discharging operation to be performed, perform a sufficient ventilation of a room, improve an efficiency of heat exchanging operation and provide a small-sized unit by a method wherein each of centrifugal blower vane wheels is constructed by radially defining severalair flow passage with heat accumulation material, first and second centrifugal blower vane wheels, third and fourth centrifugal blower vane wheels are alternatively driven to rotate. CONSTITUTION:Several air flow passage 21 are defined radially between annular plates 18 and corrugated plates 19 of centrifugal blower vane wheels 13-16 and the annular plates 18 and the corrugated plates 19 are formed of heat accumulation material. When interior is ventilated during heating operation, interior air of hot temperature is flowed in an air passage 21 of each of the second and third centrifugal blower vane wheels 14 and 15, and the annular plates 18 and the corrugated plates 19 are heated to store then heat. Surrounding atmosphere of low temperature is flowed in an air flow passage 21 of each of the third and second centrifugal blower bane wheels 15 and 14, the surrounding atmosphere is heated by a radiated heat from the annular plates 18 and the corrugated plates 19, then heated into the interior. During this process, the discharged flow of the interior air is flowed in the air flow passage 21 of each of the fourth and first centrifugal blower vane wheels 16 and 13 to store the heat.