Microwave oven with a cooling arrangement

A microwave oven having a housing including a heating chamber for heating food put therein and a machine chamber accommodating components for supplying microwave energy into the heating chamber, and a device for cooling the machine chamber, wherein the device comprises:

• a rear wall disposed behind the machine chamber, the rear wall having an opening formed at the center thereof through which an air can be introduced into the machine chamber, a plurality of first screw holes, two engagement holes, and a sleeve protruding from an inner circumference of the opening into the machine chamber;
• a fan cover covering the opening, the fan cover including a quadrilateral rear panel, four side panels respectively being formed integrally with each of four sides of the rear panel and being formed integrally with each other, a flange disposed in parallel with the rear wall and formed integrally with inner ends of the side panels, two elastic hooks to be engaged in the two engagement holes, and a plurality of pores formed throughout the rear panel and the side panels to enable the air to pass through the fan cover from exterior, the rear panel having a dent formed at the center thereof, the flange having second screw holes corresponding to the first screw holes;
• a fan motor fixed on an inner surface of the rear panel while being inserted in a bracket by a screw or a bolt, the bracket having a protuberance formed at the rear center thereof to be inserted in the dent;
• and
• a cooling fan fixed on a rotation shaft of the fan motor and accommodated in the opening,
• each of the side panels disposed at an angle to the rear panel so that the inner surfaces of said side panels confront the cooling fan, and the fan cover being assembled on the rear wall by bolts or screws fitted through the first and second screw holes, so that the rear panel is disposed behind the rear wall while being spaced a predetermined distance apart therefrom.