Abstract: A microwave oven comprises a magnetron; a body casing having a cooking compartment receiving microwaves from the magnetron and a cooling compartment formed adjacent to the cooking compartment; a thermoelement installed between the cooking compartment and the cooling compartment, and having a radiator and a heat absorber; a hot air transmitting unit transmitting hot air generated from the radiator of the thermoelement to the cooking compartment; and a cool air transmitting unit transmitting cool air generated from the heat absorber of the thermoelement to the cooling compartment. With this configuration, the cooking compartment can be used as a warmer. Also, the cooling compartment can be used as a cooler.

Abstract: A technique for passive suppression of arcs within a microwave frequency waveguide section. The waveguide is configured to have a bend at a point where the naturally, relatively high location occurs within the run. The bend at the high point causes arcs to be trapped as heat naturally collects within the waveguide at such predictable locations. Vent holes formed in the exterior portion of the waveguide at this point allow trapped hot air gases to escape, and cause the arc to be drawn towards the sidewall of the waveguide at a point where the voltage approaches zero. Presenting this region of zero voltage to the arc causes the arc to extinguish itself.

Abstract: Damping device in a microwave oven including an air duct on an electrical compartment side of a partition wall for guiding an air flow from a cooing fan to a cooking chamber, a damper rotatably hinged on the air duct for selectively blocking the air duct, a driving cam having a relative thickness difference between a thick portion and a thin portion, rotatable in contact with one end of the damper for pressing the one end of the damper to rotate the damper centered on the hinge owing to the thickness difference, and control means for controlling rotation of the driving cam, thereby providing a smooth damping operation, reducing a device cost, and preventing the microswitch from being pressed excessively.

Abstract: The present invention relates to a convection device of a microwave oven comprises a heater chamber formed on the out-side surface of a cooking chamber, a fan housing installed inside of the heater chamber so as to be rotational within a predetermined rotation range including an inlet hole where the air inside of the heater chamber flows into and a discharging hole for providing the air into the cooking chamber, and a fan installed inner side of the fan housing for generating air flow provided into the cooking chamber through the discharging hole. Accordingly, the present invention can provide the heated-air uniformly to the each portion inside of the cooking chamber.

Abstract: The object of this invention is to provide a built-in microwave oven, installed in kitchen furniture as an integral part of the furniture. In the microwave oven of this invention, a suction grille (10) and an exhaust grille (20) are provided on the front wall of the external casing, and so cooling air is sucked and discharged through the front wall of the casing. Upper and lower heaters (32a and 32b) are installed within the casing, with an upper inside air passage (18a) formed around the upper heater (32a) for guiding an air current formed by an upper heater cooling fan, and another air passage (18a) is formed around the lower heater (32b) for guiding an air current formed by a lower heater cooling fan. The inflow air from the suction grille (10) is partially and directly guided to the exhaust grille (20) so as to be mixed with hot air from the upper and lower heaters prior to being discharged from the external casing to the atmosphere through the exhaust grille (20).

Abstract: The present invention relates to a convection fan control method of a microwave oven which is capable of changing discharge direction of the air heated by a heater to a heating object by controlling rotation direction of a convection fan in accordance with types of a dish comprising a cooking time setting process for selecting a dish type of a heating object and setting cooking time, a rotation direction setting process for setting rotating direction of a fan motor which is capable of rotating and reverse-rotating, a fan motor operating process for operating the fan motor in accordance with the set rotating direction, a fan operating process for rotating a fan by the operating of the fan motor, and a cooking process for cooking the heating object for the select cooking time by operating of a heater.

Abstract: When a hood fan of a microwave oven installed at a high place operates, the air below the microwave oven is guided to a prescribed direction. Namely, the microwave oven may be used as a ventilation fan. When manner of setting of the hood fan is changed, the direction of an air outlet of the fan can be changed. When the hood fan exhausts air to the room, the number of rotation of the hood fan is made lower than when the air is exhausted outside the room.

Abstract: A wall-mounted microwave oven having a main body forming a cavity into which food to be cooked is put and a casing enclosing the main body is provided. The casing includes a suction port on its bottom, a discharge port on its top, and a hood fan installed adjacent to the discharge port. A fan case in which the hood fan is housed, includes an outlet communicating with the discharge port of the casing and an inlet communicating with the suction port of the casing. An air pipe connected to the suction port of the casing at one end thereof and connected to the inlet of the fan case at the other end thereof guides air from the suction port into the inlet of the fan case.

Abstract: A microwave oven includes electronic components such as a high voltage transformer and a high voltage capacitor constituting a control circuit. These components are provided on a bottom panel of the microwave oven. A filter is fit under the bottom panel of the microwave oven. By removing the filter, the bottom panel can be detached from the main body frame. By detaching the bottom panel from the main body frame, the electronic components such as the high voltage transformer and the high voltage capacitor can be removed from the main body of the microwave oven while the microwave oven is still mounted at a high position. A cooking appliance that can be easily handled is provided.

Abstract: A microwave oven having a cooking chamber and a fan housing, both of which are isolated by a partition is provided. The microwave oven includes a heater housing depressed from the partition toward the fan housing and having at least one air discharge hole formed thereon. The air discharge hole communicates with the fan housing and a convection heater is housed in the heater housing. A fan is installed in the fan housing blowing air from the fan housing into the cooking chamber through the air discharge hole and the convection heater. With this configuration, loss of heat is reduced, thereby improving the efficiency of cooking and reducing the cost of production.

Abstract: A cooling system for a ventilation-hooded microwave oven is disclosed. The cooling system includes an instrument compartment provided at a position spaced apart from a cooking cavity of the microwave oven, a first electronic equipment piece positioned at the upper portion of the instrument compartment, and a second instrument equipment piece positioned at the lower portion of the instrument compartment. A fan assembly is mounted in the instrument compartment at a position above the first electronic equipment piece, thus allowing the air current generated by the fan assembly to cool both the first and second electronic equipment pieces, efficiently.

Abstract: In a common casing, a domestic appliance comprises an oven (60) and a ventilator device (20). The ventilator device (20) has a ventilating duct (21) extending between at least one inlet opening (23) and at least one outlet opening (24, 25) on the outside of the casing (50). A ventilator (22) arranged in the ventilating duct (21) is stationarily mounted in the casing (50) spaced from the outlet opening (24, 25). A flow control means (30) is arranged in the casing (50) downstream of the ventilator (22) for adjusting the duct (21) to lead out at any one of at least two outlet locations (16, 17, 18). A suitable flow control means (30) has an elongated control means housing (39) and comprises an outlet opening (32) and an inlet opening (31). The outlet opening (32) is arranged along a long side and the inlet (31) opening is arranged along another side and has a smaller opening area than the outlet opening (32).

Abstract: A wall-mounted microwave oven and a control method for controlling a hood motor are provided. Here, the wall-mounted microwave oven having a main body forming a cavity for accommodating foods to cook, a casing enclosing the main body and forming a hood duct having an inlet located on a bottom area and an outlet located on an upper area, and a hood fan installed in the hood duct, includes a hood motor driving the hood fan, a first switching portion for switching a current supplied from an external electrical power source to the hood motor, and a microcomputer for controlling the rotational speed of the hood motor by adjusting an on/off time of the first switching portion, based on an external control signal. Thus, since the speed of the hood fan can be varied, conveniences of users can be achieved.

Abstract: A method and apparatus are disclosed for analyzing the aggregate content of asphalt-aggregate compositions. The method includes placing a preheated, preweighed container carrying a sample of an asphalt-aggregate composition into a preheated furnace with the preheated furnace being warmer than the preheated sample, continuing to heat the furnace while drawing air through the furnace at a rate that avoids impeding the heating of the furnace or the sample until the sample in the container reaches its combustion temperature and the combustion of the sample becomes exothermic, initiating a second draw of air around rather than through the furnace to moderate the exterior temperature of the furnace, accelerating the draw through the furnace to increase the rate of combustion of the exothermic reaction, and reweighing the container and sample after combustion is complete.

Abstract: An air duct in a multi-purpose microwave oven is disclosed, which prevents an oven lamp from being overheated. The air duct in a multi-purpose microwave oven includes a main body having an air inlet and an air outlet to communicate a cooking chamber with a component chamber, a partition provided on an inner space of the main body to guide air flow into a first path located at the air inlet and a second path communicated with the cooking chamber, an air discharge opening formed on a wall on the first path to communicate with the outside, an oven lamp provided in the first path, and a closing device provided between the first path and the second path, for selectively blocking air flow into the second path so that air flown into the main body is selectively discharged through the air outlet or the air discharge opening.

Abstract: A high frequency heating cooking apparatus is capable of preventing from rusting and reducing the cost substantially at the same time. The heating compartment of the high frequency heating cooking apparatus of the invention comprises a side wall, a top panel, and a bottom panel. By folding and plating one plated steel plate, the side wall having a left side wall, a right side wall, and a back side wall is formed. The plated steel plate has a function of preventing from rusting. The top panel is made of a stainless steel material, and this top panel has a power feed port, an intake hole, and an exhaust hole. The side wall made from a plated steel plate does not have opening ends of holes such as intake hole and exhaust hole.

Abstract: A method and apparatus are disclosed for analyzing asphalt-aggregate compositions. The method includes directing sufficient microwave radiation from a microwave source to a sample of an asphalt-aggregate composition to ignite the asphalt in the composition and to thereafter entirely combust the asphalt in the sample. The apparatus includes a source of microwave radiation, a cavity in communication with the microwave source, a sample holder in the cavity for holding a sample of an asphalt-aggregate composition during exposure to microwaves from the source, thermal insulation between the sample holder and the remainder of the cavity, and means for minimizing or eliminating any undesired combustion products generated by the burning asphalt.

Abstract: An air circulation structure for a microwave oven is disclosed. The structure includes a fan for sucking air into the interior of a machinery compartment installed below a cooking chamber of the microwave oven, a bottom plate having an air suction port through which an air sucked by the fan and radiating heat generated from the electrical elements of the microwave oven is flown into the interior of the cooking chamber, and a rear surface plate having a first air discharge port through which the air passed through an air suction port formed on the bottom plate and circulated in the interior of the cooking chamber is discharged to the outside of the microwave oven, for thereby effectively radiating heat from electrical elements of a microwave oven having a machinery chamber installed below a cooking chamber and dehumidifying from the interior of the cooking chamber.

Abstract: A cooling device for halogen lamps in microwave ovens is disclosed. In the cooling device, two halogen lamps, installed on the top wall of the cavity, radiate light waves into a cavity. A cooling fan assembly, provided at a position around the halogen lamps, generates a cooling air current for the lamps. An air guide duct guides the cooling air current so as to allow the air current to flow from the cooling fan assembly into the atmosphere while cooling the lamps. An exhaust fan is provided within the air outlet port of the air guide duct. The exhaust fan increases the flowing rate of the air current at the air outlet port, which is bent at a right angle. Due to the exhaust fan, the cooling device of this invention more effectively cools the halogen lamps and allows the cooling air current to be more smoothly discharged from the duct into the atmosphere regardless of the bent shape of the air outlet port.

Abstract: A wall-mounted microwave oven and a control method for controlling a hood motor are provided. Here, the wall-mounted microwave oven having a main body forming a cavity for accommodating foods to cook, a casing enclosing the main body and forming a hood duct having an inlet located on a bottom area and an outlet located on an upper area, a hood fan installed in the hood duct, and a hood motor driving the hood fan, includes an inverter part for controlling the frequency of a supply current supplied from an external electrical power source to the hood motor, and a microcomputer for controlling the speed of the hood motor by transmitting a control signal to the inverter part, based on an external control signal. Thus, the size of the hood motor can be reduced, thus reducing a cost. Also, since the speed of the hood fan can be varied, ventilation and exhaust are performed within an optimal time to thereby seek conveniences of users.

Abstract: A cooling device for halogen lamps in microwave ovens is disclosed. In a microwave oven, the halogen lamp is installed on the top wall of a cavity. The lamp is operated by electric power applied thereto through a sealing part provided at each end thereof. The lamp thus radiates heating light waves, having a predetermined wavelength, into the cavity. A light reflection plate surrounds and holds the halogen lamp while forming a lamp chamber on the top wall of the cavity and allows the light waves to be guided from the lamp into the cavity, with the sealing parts of the lamp being positioned outside the light reflection plate. A cooling device generates a cooling air current and guides the cooling air current to the sealing parts positioned outside the light reflection plate.

Abstract: A cooling device for microwave ovens with halogen lamps is disclosed. The cooling device is designed to divide the cooling air current, generated from a cooling fan unit, into two currents, an upper current and a lower current. The upper and lower currents are respectively fed to the passages above and below the top wall of a cavity. The cooling device comprises a halogen lamp installed on the top wall of the cavity and radiates heating light into the cavity. A lamp protection filter is provided on the top wall of the cavity and allows the heating light to be led from the halogen lamp into the cavity. A cooling fan unit generates the cooling air current, which is guided to the passages above and below the top wall of the cavity.

Abstract: Disclosed is a wall mounted microwave oven including a body forming a cavity for accommodating the food to be cooked, a casing enclosing said body and having an inlet port and an outlet port respectively at the bottom part and on the top part thereof, to form a hood duct, and a hood fan being installed within said hood duct, comprising: a first switching part disposed on a main power source line interconnecting said hood fan and a power source, for switching on or off power transmission to said hood fan, a sensing switching part disposed on a sub power source line connected in parallel to said main power source line, and being turned automatically on or off depending on ambient temperature to switch on said hood fan when ambient temperature is over a predetermined temperature, and a second switching part disposed on said sub power source line, and being turned manually on or off to allow said hood fan to be switched of during said sensing switching part is on.

Abstract: A wall mounted microwave oven is provided which includes a body forming therein a cavity for accommodating food to be cooked, a magnetron for generating electromagnetic waves to be provided into the cavity, a casing surrounding the body and forming therein a hood duct having an inlet port positioned at the bottom portion of the casing and an outlet port positioned in the upper portion thereof, and a hood fan installed in the hood duct. The wall mounted microwave oven includes a hood sensor for sensing a status that operation of saidhood fan is needed; a first switch for selectively supplying one out of a low-level voltage and a normal voltage to the magnetron, and a controller for controlling the hood fan to operate if a detect signal informing operation of said hood fan is needed is input from the hood sensor and simultaneously controlling the first switch to change the electric power to be supplied to the magnetron from the normal voltage into the low-level voltage.

Abstract: A wet prevention apparatus for a sensor of a microwave oven is disclosed, which prevents wet from occurring in a sensor for use in a microwave oven without a separate driving gear. In a microwave oven including a cooking chamber, and a machine chamber isolated from the cooking chamber by an isolation wall having a sensor hall, wherein a sensor case having a sensor therein and a fan are mounted in the machine chamber, the wet prevention apparatus for a sensor of the microwave oven includes an air receiving member for moving by air flow which occurs when driving the fan, and a blocking member linked to the operation of the air receiving member, for selectively blocking the sensor hole.

Abstract: A wall type microwave oven having a hood device and an output control method thereof are disclosed. The microwave oven includes a first switch section for switching a power supply to a hood motor of the hood device, and a second switch section for switching power supply to a hood lamp of the hood device. A third switch section controls the output of the microwave oven by several stages. A control section switches/controls the third switch section, responsive to a control of the first or second switch section, such that when the microwave oven is operated with the hood motor or said hood lamp, output of the microwave oven is to be a low level.

Abstract: A microwave oven has an inner casing for forming a cooking chamber, and an outer casing for enclosing the inner casing. An air duct is formed between the inner casing and the outer casing. A drawing port and an exhaust port are formed respectively on the lower and the upper sides of the outer casing, and the air duct interconnects the ports. A ventilator is installed beside the cooking chamber in the air duct. The ventilator has an axial fan rotating about a vertical axis so as to draw air into the air duct through the suction port and exhaust air in the air duct through the exhaust port. The size of the cooking chamber is not reduced by the ventilator since the ventilator is installed beside the cooking chamber, and the drawing force of gas increases to thereby enhance the ventilation effect since the ventilator is disposed near the drawing port.

Abstract: A portable microwave oven includes: electrical components for generating microwaves; a heating chamber for food to be heat cooked; and a door for allowing food to be put in and taken out from the heating chamber. The door incorporates a microwave stirrer for agitating microwaves. When food is heated, the user takes the tray out from the heating chamber so as to place food and then can easily put the food together with the tray by holding the handle of the tray. Similarly, when food is taken out, it is taken out together with the tray.

Abstract: This invention relates to a cooling apparatus for a microwave oven using lighting lamps as a heat source other than microwaves. According to this invention, the microwave oven comprises a pair of lighting lamps set on the upside and downside of a cavity and a pair of cooling fans to supply airflow for cooling the lighting lamps. The airflow by the cooling fan goes towards the inner part of the microwave oven from its outer part, thereby primarily cooling the lighting lamps. In addition, part of the airflow cooling the lighting lamps is exhausted from the microwave oven through the inside cavity of the microwave oven inner air of cavity in harmony.

Abstract: A surge current prevention circuit of a microwave oven, where a surge relay is turned on or turned off by a predetermined DC voltage supplied by rectification of a predetermined low voltage, such that cost of parts of the surge current prevention circuit becomes low to thereby reduce the manufacturing cost, and electricity can be decreased and operation of the microwave oven can be stabilized by the constant switching operation time of the surge relay.

Abstract: Disclosed is a microwave oven comprising, a body divided into a cooking chamber and a device chamber, a magnetron installed in the device chamber of the body, a high voltage condenser and a high voltage transformer, and a blower for cooling elements installed in the device chamber. The blower comprises a fan for forcedly blowing air, and a motor having a stator, a rotor, and at least one fixing rod. The stator is equipped with a bobbin with a coil wound thereon. The stator provides the fan with a driving force. The fixing rod is extended from the stator and coupled with a rear panel of the body. The fixing rod passes through the rear panel, and is formed with a screw part at an end part thereof which is assembled with a nut. The blower for cooling the devices for generating microwave is directly fixed onto the rear panel of the body without using a bracket. Accordingly, unit cost is reduced due to a reduced amount of elements.

Abstract: Disclosed is a wall mounted microwave oven and a control method therefor including a body forming a cooking cavity for accommodating food to be cooked, a magnetron for generating electromagnetic waves to be provided into the cooking cavity, a casing surrounding the body and forming therein a hood duct having an inlet port positioned at the bottom portion of the casing and an outlet port positioned in the upper portion thereof, and a hood fan installed in the hood duct. The wall mounted microwave oven includes a switch for selecting one out of a low-level voltage and a normal voltage supplied to said magnetron and a controller for controlling the switch in such a manner that the low-level voltage is supplied to the magnetron when the hood fan operates during the magnetron operates with the normal voltage, and simultaneously extending remaining cooking time by a predetermined rate.

Abstract: The present invention relates to heating cookers, particularly to a structure for ventilation and cooling of microwave ovens employing a range hood. The structure according to the present invention enhances the ventilation airflow and capacity of a heating chamber by enlarging diameter of a ventilating fan by forming a recess on an upper wall of the heating chamber and by disposing the ventilating fan in the recess. Also, an improvement in ventilation efficiency is achieved by disposing the ventilating fan of a larger diameter at either or both ends of a wave-guide, and dividing the airflow path into an evenly well balanced plurality of airflow paths. Moreover, an openable door is attached to either or both of an exhaust opening and an intake opening for the air to pass through an inner surface of the door, thereby keeping the soiled surface inconspicuous.

Abstract: A microwave oven having a silent cooking mode and a method for operating the microwave oven are disclosed. The microwave oven has a magnetron driving section connected to a secondary winding of a high voltage transformer which receives an external power source via a primary winding thereof. A fan motor ventilates a cooking chamber of the microwave oven and a silent cooking mode selecting key selects the silent cooking mode. Voltage dividing section divides the voltage of the external power source. Switching section supplies the external power source to the fan motor at a normal cooking mode and supplies the external power source of which the voltage is divided by the voltage dividing section to the fan motor at the silent cooking mode. Control section controls the switching section in response to a key signal from the silent cooking mode selecting key. Accordingly, when the user selects the silent cooking mode, a noise generated from the fan motor is reduced remarkably.

Abstract: A high voltage transformer of a microwave oven has a structure for radiating heat efficiently. The high voltage transformer comprises a core formed of a plurality of iron plates fixed together one after another, a coil wound on the core, and heat radiation fins disposed between the iron plates in such a manner that flange parts of the fins extend outwardly beyond an outer periphery of the core. The heat radiation fins are spaced from the iron plates so as not to be in contact with the iron plates, and are made of a high thermal conductivity material. Portions of the flange parts are bent to form air flow openings that conduct cooling air in close contact with the core.

Abstract: A heating apparatus includes a central support axle positioned within a heating chamber of the heating apparatus. The heating apparatus provides both hot-air heating and micro-wave heating. A turntable has a central portion supported by the central support axle so that the turntable is rotated around the central support axle. A driving source is positioned at an upper side of the heating chamber for generating a rotating torque, and a connecting shaft for transmitting the rotating torque generated by the driving source to the turntable is provided in the heating chamber. The turntable has an entirely flat shaped section including a plane on which food products to be heated are mounted. A central portion of the flat shaped section is defined at a concave which is downwardly recessed into the plane and arranged to be fixed to and supported by the central support axis.

Abstract: An exhaust structure for ventilation-hooded microwave ovens is disclosed. The exhaust structure includes an exhaust motor mounted to the rear portion of an air duct, an instrument compartment divided into front and rear portions by an air guide plate, an internal exhaust passage formed at the rear portion of the instrument compartment, and a lower panel mounted at the lower portion of the instrument compartment. Electronic equipment, used for generating microwaves, is installed at the front portion of the instrument compartment. The lower panel has exhaust holes communicating with the internal exhaust passage, thus allowing the exhaust passage to be linearly formed on the same plane at a position between the exhaust motor and the lower panel.

Abstract: A heat cooker includes a generally box-like cooker body having ventholes at a bottom board thereof, a heating room disposed in the cooker body, a heat source disposed in the cooker body for heating foods in the heating room and an accessory storage section disposed under the bottom board of the cooker body,wherein the accessory storage section comprises a pair of leg bodies which support the cooker body and are attached on both sides of the bottom board and a plate-like accessory storage body which is supported by the leg bodies and inserted between the leg bodies to be capable of being pulled out forward, andwherein the leg bodies are further provided with ventilation slits that form an airway between an inside of the cooker body and an outside through the ventholes of the bottom board and an area above the plate-like accessory storage body.

Abstract: A microwave oven includes a cooking chamber and an electronic component compartment separated from one another by a partition wall. Air inlet holes are formed in an upper portion of the partition wall, and air outlet holes are formed in another wall of the cooking chamber to enable air to be circulated through the cooking chamber by a fan disposed in the electrical component compartment. First drain holes are formed in a lower portion of the partition wall diagonally opposite the air inlet holes to enable condensed moisture formed in the cooking chamber to drain into the electrical component compartment. That moisture exits the electrical component chamber through second drain holes formed in the floor of the electrical component compartment. A barrier is disposed in the electrical component compartment to surround the first and second drain holes, thereby preventing moisture from reaching any of the electrical components.

Abstract: The invention relates to an apparatus and method for operating a turntable motor in a microwave oven. The inventive system includes a transformation of a commercial power supply into a lower voltage power source for application to the turntable motor when the turntable motor is operated in response to a control signal.

Abstract: An oven door for closing a cooking chamber of an oven, the door being composed of: a frame on the oven; an inner wall and an outer wall both supported by the frame so that the inner wall is located between the cooking chamber and the outer wall, the inner wall and outer wall being positioned relative to one another to delimit an air space; and ventilation elements for establishing a flow of air between the inner wall and the outer wall in order to maintain the outer wall at a low temperature during a cooking operation, wherein the inner wall is made of glass, and the outer wall is removable from the frame and is made of a plastic material selected to withstand the temperatures to which it will be exposed during any cooking operation.

Abstract: A door lock mechanism with a duct is disclosed, which has a duct section, a first lock part, a link bar part, a link bar part guiding part, a second lock part and an engagement part. The link bar part is formed in a rectangular bar shape and has a plurality of engagement grooves. One end of the link bar part is fixedly connected to the other end of the first lock part. The link bar part guiding part is formed in a rectangular bar shape of which center portion is hollow to form an insertion groove. The upper portion of one side of the link bar part guiding part has an engagement hole, and the link bar part guiding part is long enough for the link bar part to be fully inserted thereinto. The link bar part is inserted from the other end of the link bar part guiding part and each of the plurality of engagement grooves become correspondent to the engagement hole in turn when the link bar part is inserted into the insertion groove of the link bar part guiding part.

Abstract: An over-the-range microwave oven includes air intakes in its bottom wall and fans disposed at an upper portion of the oven for drawing air through respective intakes. The fans are mounted in respective cases, each of which forms an air inlet and an air outlet. Each air inlet communicates with a respective intake, and the air outlets communicate with a common duct leading to a discharge grill. Filters extend across respective ones of the air outlets and are of substantially the same size as the respective air outlets.

Abstract: A microwave oven includes a protective cover for enclosing a choke PCB, on which a choke device and a fuse are mounted, whereby moisture is not formed on the choke device and fuse, and the choke device and fuse are protected against contact. The accidental protective cover has vent slots and is provided near a rear plate forming one portion of the housing of the microwave oven. Air slots, through which outside air is drawn, are formed on a portion of the rear plate that faces the vent slots of the protective cover.

Abstract: An over-the-range type oven incorporating a bottom plate having substantially triangular shaped openings, or inlets, is described. In one embodiment, the bottom plate has a first, interior surface and a second, range-facing surface. First and second triangular shaped openings, or inlets, extend through the bottom plate, and each triangular shaped opening has a first leg, a second leg and a third leg. The bottom plate may further include a first air guide positioned adjacent at least one of the first opening legs and extending from the bottom plate first, interior surface for directing air flow through the first opening and into the oven cabinet, and a second air guide positioned adjacent at least one of the second opening legs and extending from the bottom plate first, interior surface for directing air flow through the second opening and into the oven cabinet.

Abstract: A microwave oven incorporating therein an air cooling system comprises an outer casing containing a cooking chamber and a compartment. The compartment is provided with an air intake opening. A magnetron and a high voltage transformer are positioned at upper and lower sides within the compartment, respectively. A cooling fan is disposed at a position near the high voltage transformer and forces cooling air around the microwave oven to enter the compartment through the air intake opening and to leave the compartment along a plurality of airflow routes. A screen plate is disposed between the high voltage transformer and the cooling fan and directs a part of the cooling air from the cooling fan to the magnetron so that the magnetron is directly cooled by the cooling air.

Abstract: An air flow system for cooling heat generating elements, such as a magnetron and high voltage transformer, of microwave ovens is disclosed. Air inlet holes are formed on the casing's bottom at a portion in the front of the fan. Air outlet holes are formed on the casing's rear wall. A fan is set in an air guide wall standing on the casing's bottom at a portion between the inlet holes and the heat generating elements. In the system, the outside air is introduced into the casing through the inlet holes by the blowing force of the fan and cools the heat generating elements prior to exhausting to the atmosphere through the outlet holes. The air guide wall eliminates reverse flow of the air in the casing. The cavity has air guide holes on one side wall thereof and cavity air exhaust holes on the other wall thereof, so the air is directly introduced into the cavity.

Abstract: A microwave oven cooks in a microwave cooking mode using a magnetron, or in an oven cooking mode using a convection heater. A passage is provided for conducting outside air to the cooking chamber, and a fan is disposed in the passage for inducing the outside air flow. During the oven cooking mode, the convection heater is activated and the fan is deactivated, while the temperature in the cooking chamber is less than a reference temperature set by a user. When the temperature in the cooking chamber exceeds the reference temperature, the heater is deactivated, and the fan is activated.

Abstract: An electrically heated convection oven with built-in rotisserie for rotisserie roasting, baking, broiling, defrosting, and dehydrating foodstuff is characterized by the use of two motors. One for operating a fan which rotates within the heating chamber to create high velocity air flow throughout the heating chamber; the second one for rotating the rotisserie spit. The second motor is also utilized to drive a cooling fan that draws air over electronic controls to keep them safely cool. The electronic controls comprise a microcomputer which is pre-programmed to recognize input from a user and to process information from an air temperature sensor in the oven. The heating chamber features generously radiused, interior surfaces which from an integral, parabolic, reflective surface with substantial width for enhancing air flow, to increase air velocities and create evenness of heat within the heating chamber, thereby contributing to the performance of the oven.

Abstract: A microwave oven has a cooking chamber in which an electric heater is provided to perform convection cooking as an alternative to high frequency cooking. Heat from the heater is circulated within the cooking chamber by a heat-circulation fan situated behind an apertured back wall of the cooking chamber. A cooking chamber disposed behind the heater houses a motor for driving the heat circulation fan and also for driving a cooling fan disposed in the cooling chamber. The cooling fan draws in cooling air through cool air apertures formed in the rear of the oven. Hot exhaust air from the cooking chamber is discharged through exhaust holes formed in the rear of the oven, next to the cool air apertures. In order to minimize the travel of hot exhaust air from the exhaust holes to the cool air apertures a guide duct mounted on the rear of the oven directs the exhaust air from the exhaust holes upwardly to a discharge outlet at the top of the duct.