초록 ▼

A combined microwave-thermal range having an oven cavity with a thermal heating element for baking and self-cleaning purposes, the bottom wall of the oven cavity having an inlet opening and the top wall having a vent opening. A microwave module mounted in space provided under the bottom wall of the

A combined microwave-thermal range having an oven cavity with a thermal heating element for baking and self-cleaning purposes, the bottom wall of the oven cavity having an inlet opening and the top wall having a vent opening. A microwave module mounted in space provided under the bottom wall of the cavity includes a microwave power supply housing enclosing a magnetron and blower. The module has an associated waveguide secured to the top of the housing and extending cantilever-fashion close to the bottom wall of the cavity, with the outlet of the waveguide in alinement with the central opening couples microwave energy from the waveguide to the cavity. Blower air passes from the blower inlet through the magnetron and waveguide and into the cavity for ventilating the same. The blower inlet is located at a level below the bottom wall of the cavity so that, when the blower and magnetron are turned off and the thermal element is turned on, air passing through the blower, power supply housing and waveguide flows upwardly by natural convection into the opening in the bottom wall of the cavity with final escape through the vent at the top of the cavity.

대표청구항 ▼

In a combined microwave-thermal range, the combination comprising a frame having walls defining a rectangular oven cavity and a lower space, a door enclosing and sealing the front surface of the cavity against passage of air and microwave energy, a thermal element in the cavity, control means for op

In a combined microwave-thermal range, the combination comprising a frame having walls defining a rectangular oven cavity and a lower space, a door enclosing and sealing the front surface of the cavity against passage of air and microwave energy, a thermal element in the cavity, control means for operation of the thermal element at a normal temperature level for food preparation and at a high level for a self-cleaning mode, the walls of the cavity being insulated, the bottom wall of the cavity having an inlet opening, means defining a cavity air vent at the top of the cavity, a microwave power supply including a blower and a magnetron having cooling fins, the blower having a blower inlet for drawing in cooling air and an outlet for supplying such air under slight pressure to the cooling fins, a waveguide having an inlet connected to the magnetron and extending under the bottom wall of the cavity to terminate at an outlet, means for connecting the outlet of the waveguide to the inlet opening of the cavity for conduction of microwave energy into the cavity, means defining air passages of limited cross section for conducting air from the magnetron into the waveguide so that a portion of the pressurized air passes through the waveguide and into the cavity for ventilating the cavity when the magnetron and blower are turned on, the blower inlet being located at a lever below the bottom wall of the cavity so that when the blower and magnetron are turned off and the thermal element is turned on air is thermally convected from the blower inlet through the air passages into the waveguide and into the cavity for exiting through the cavity air vent notwithstanding the auto ignition pressure which exists in the cavity under high temperature self-cleaning conditions, the convention path of the air being sufficiently constricted so that air is convected in the self-cleaning mode at a level below that which is capable of producing an explosive reaction with the products of decomposition.