Abstract: A heat cooking device comprises a casing, a heating chamber, and an exhaust duct having an outlet provided on a rear edge side of an upper surface of the casing such that exhaust air from an inside of the casing is blown out forward. An upper outer wall surface of a rear surface plate of the casing is covered by the exhaust duct to form an exhaust passage between the casing and the exhaust duct. A guidance part is provided inside the exhaust passage, and guides the water infiltrating into the exhaust passage through the outlet of the exhaust duct, downward inside the exhaust passage.

Abstract: A heat cooking device comprises a casing, a heating chamber, and an exhaust duct having an outlet provided on a rear edge side of an upper surface of the casing such that exhaust air from an inside of the casing is blown out forward. An upper outer wall surface of a rear surface plate of the casing is covered by the exhaust duct to form an exhaust passage between the casing and the exhaust duct. A guidance part is provided inside the exhaust passage, and guides the water infiltrating into the exhaust passage through the outlet of the exhaust duct, downward inside the exhaust passage.

Abstract: A water level sensor (91) is provided in an auxiliary tank (39) whose bottom portion communicates to a bottom portion of a pot (41) for generating steam and which is opened to the atmosphere. When water in the pot (41) keeps boiling and the stop time of a pump (35) reaches a predetermined time (e.g., 60 sec.), the pump (35) is driven for a predetermined time (e.g., 6 sec.) to supply water to the pot (41). This temporarily suppresses the boiling of water in the pot (41), lowering a steam pressure in a space formed by an external circulation passage (60), a heating chamber, and the pot (41). The water level in the auxiliary tank (39) then returns to a normal one, making it possible to correctly detect the water level in the pot (41).

Abstract: A cooking device is provided with a casing, a heating compartment (102) provided within the casing and having an opening on the front face side of the heating compartment, a door for opening and closing the opening of the heating compartment (102), a lamp (104) for lighting the inside of the heating compartment (102), and a steel plate (134) mounted indirectly to the heating compartment (102). The lamp (104) is mounted to the free end section of the steel plate (134).

Abstract: A heat-cooking apparatus includes blowing means (100) that blows cooling air to an opening (20a) of a heating chamber (20) when a door (11) is opened after steam is supplied to the heating chamber (20) for preparatory operation before heat-cooking or for heat-cooking itself. More specifically, after steam is supplied to the heating chamber (20), when the door (11) is opened, the blowing means (100) drives a conventionally existing cooling fan (101) to suck in cooling air from outside the apparatus, and deflects the cooling air toward the opening (20a) of the heating chamber (20) with a decoration box (102) so that the cooling air is blown to the opening (20a) so as to pass sideways substantially across it. Thus, the cooling air mixes with high-temperature steam that tends to overflow frontward as soon as the door (11) is opened, and thereby lowers the temperature of the steam. This surely prevents the user from being hurt, as by being burnt, with the overflowing steam.

Abstract: A water level sensor (91) is provided in an auxiliary tank (39) whose bottom portion communicates to a bottom portion of a pot (41) for generating steam and which is opened to the atmosphere. When water in the pot (41) keeps boiling and the stop time of a pump (35) reaches a predetermined time (e.g., 60 sec.), the pump (35) is driven for a predetermined time (e.g., 6 sec.) to supply water to the pot (41). This temporarily suppresses the boiling of water in the pot (41), lowering a steam pressure in a space formed by an external circulation passage (60), a heating chamber, and the pot (41). The water level in the auxiliary tank (39) then returns to a normal one, making it possible to correctly detect the water level in the pot (41).

Abstract: A controller monitors water temperature in a pot (41) through a water temperature thermistor in a temperature sensor (48) while a water level sensor is detecting the water level in the pot. When the water temperature in the pot exceeds 110° C., the controller determines that the water level thermistor in the water level sensor (43) cannot perform normal detection, and drives the pump (35) to supply water. When water supply based on the temperature detected by the water temperature thermistor is carried out more than three times, the controller determines that scale has deposited on the water level sensor (43), and notifies a user of a scale cleaning request. In this manner, in the case of detection failure of the water level thermistor, it is possible to notify a scale cleaning request at an appropriate time by determining whether or not the detection failure is attributable to scale deposits.

Abstract: Steam generated by a steam generating device is fed, through an outer circulation passage, to a heating chamber. The steam generating device is provided with a barrel shape pot having a flat, elongate horizontal cross section, a steam generating heater arranged in a bottom part of the pot, and a steam suction portion that extends, above the pot, in a direction in which the steam suction portion crosses an axis line of the pot. The steam suction portion is built with a plurality of steam suction ejectors that are each formed to penetrate the pot from one flat side to an opposite flat side. The steam that has exited from the steam suction ejector flows through a duct into a sub-cavity provided adjacent to the heating chamber, then is heated by a vapor heating heater provided in the sub-cavity, and is then blown into the heating chamber.

Abstract: A heat-cooking apparatus includes blowing means (100) that blows cooling air to an opening (20a) of a heating chamber (20) when a door (11) is opened after steam is supplied to the heating chamber (20) for preparatory operation before heat-cooking or for heat-cooking itself. More specifically, after steam is supplied to the heating chamber (20), when the door (11) is opened, the blowing means (100) drives a conventionally existing cooling fan (101) to suck in cooling air from outside the apparatus, and deflects the cooling air toward the opening (20a) of the heating chamber (20) with a decoration box (102) so that the cooling air is blown to the opening (20a) so as to pass sideways substantially across it. Thus, the cooling air mixes with high-temperature steam that tends to overflow frontward as soon as the door (11) is opened, and thereby lowers the temperature of the steam. This surely prevents the user from being hurt, as by being burnt, with the overflowing steam.

Abstract: A microwave oven with an invertor control power source produces a microwave by the use of the magnetron in relation to the high frequency power generated by the invertor control power source. The heat sensitive ferreit beads provided on the lead wire for transmitting the high frequency power to the magnetron changes the inductance of the wire from the high level to the low level at around a threshold temperature lower than the working equilibrium temperature of the magnetron. The cathode filament current remains within the allowable range, and the moding of the magnetron is prevented. The magnetron can operate in a long life time.