STRUCTURE OF MICROWAVE OVEN

摘要

PURPOSE: A structure is provided to reduce the producing cost of a microwave oven by increasing reliability of a system and productivity with high shielding efficiency for electric wave, high heat delivering efficiency of a heater unit and change of cooling channel of the heater unit. CONSTITUTION: A structure of a microwave oven contains a first and a second shielding device. The first shielding device shields electric wave and forms a porous plate transmitting the radiation heat by adjusting an opening ratio with an irregular hole diameter limited depending on intensity of a microwave field. The second shielding device has more than one layer independent of the porous plate in order to shield the electric wave and transmit the radiation heat through the layer. An outer air suction fan(40) feeds the outer air to a heater chamber(10) by forming interactive vent holes(41,42). The vent holes are connected to the heater chamber to feed outer air to the chamber. Thereby, the microwave oven increases reliability and productivity and then reduces the producing cost.