Abstract: The cooling device of the present invention includes a casing divided into a first fluid passage and a second fluid passage by a fluid separation plate; a heat exchanger disposed to pass through the fluid separation plate, for receiving heat from high-temperature air flowing in the first fluid passage and for radiating the heat to the outside air flowing in the second fluid passage; an inside fan for blowing the high temperature air in the first fluid passage; an outside fan for blowing the outside air to the second fluid passage; and a thermistor for sensing a temperature of the high temperature air flowing in the first fluid passage. A rotational speed of each of the fans of the inside fan and the outside fan is variably controlled in response to a temperature detected by the thermistor with the controller. In this way, it is possible to cooling an interior of a closed box and to reduce the consumed electric power.

Abstract: It is the primary object of the present invention to provide a catalyst converter which can hold a sufficient amount of catalyst to raise the temperature thereof to the catalyst activation temperature in a short time without enlarging the metal carrier itself. The metal carrier 1 is arranged in the course of an exhaust manifold 3 of an engine 2 and is composed of an alternating winding of a flat sheet 7 and a corrugated sheet 8, wherein slit parts 9 are formed in the flat sheet 7 and the corrugated sheet 8 of the metal carrier 1 in an end portion thereof, on the side the engine 2.

Abstract: A self-heat generating type honeycomb filter is mounted in an exhaust pipe line of an engine, and a plane plate and a corrugated plate are layered, then wound, and the first slit portion and second slit portion having openings, respectively, are formed between an up-stream and down stream side end portions of the plane and corrugated plates. An electric current is applied between the up-stream and down stream side end portions, to heat the first and second slit portions. Accordingly, a self-heat generation type catalytic converter capable of realizing both high resistance and low thermal capacity, and further ensuring a reduction in thermal conduction, and durability, and raising the temperature up to the sufficient level with less power consumption, can be provided.