Microwave oven adopting cylindrical oven chamber and taking helical antenna as radiator

Abstract

The invention belongs to a microwave oven for food cooking. The microwave oven comprises a microwave oven casing, a cylindrical oven chamber arranged in the casing, an electric appliance box, a microwave magnetron, an L-shaped waveguide tube comprising a vertical waveguide tube and a horizontal rectangular waveguide tube provided with a waveguide outlet, a helical antenna, a microwave reflector, a power supply, a fan, a circuit board, an oven door and a panel provided with a circuit control key or knob, wherein the microwave magnetron and the L-shaped waveguide tube are arranged in the electric appliance box. The microwave oven adopts the cylindrical oven chamber, so that eight useless energy storage dead angles of the traditional oven chamber are eliminated; the circularly polarized helical antenna is taken as a microwave radiator, the rotation speed of the helical antenna is working frequency of a microwave source, uniformity of microwave radiation and heating of heated objects are effectively improved, the utilization rate of energy is effectively increased, and heating time is shortened. Thus, the microwave oven has the characteristics that the structure is simple, an oven body is light, microwave radiation and heating of the heated objects are uniform, the utilization rate of the energy and the energy efficiency are high, the heating time is short, the service life is long, the production cost is low and the like.

Description

technical field [0001] The invention belongs to a microwave oven for food cooking, in particular to a cylindrical furnace cavity and a circularly polarized helical antenna as a radiator to radiate ultra-high-speed rotating electromagnetic waves (the rotation rate is the same as the operating frequency of the microwave source), so that A microwave oven in which the microwave radiation in the heating (resonance) cavity and the object to be heated are heated evenly. When the microwave operating frequency is 2450MHz, the microwave rotation rate is 2.45×10 9 r / sec (2.45 billion times / second) (that is, the speed is 1470×10 8 rpm's super high-speed rotation). Background technique [0002] It has been nearly 70 years since the microwave oven was invented. Traditional microwave ovens include a shell, a cubic microwave heating (furnace) cavity inside the shell, and a microwave-containing magnetron (microwave generator) and its feeder that are isolated from the microwave heating cavit...

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Problems solved by technology

[0005] The solution of the microwave oven of the present invention is to improve the cubic furnace (heating) cavity of the traditional microwave oven into a cylindrical furnace (heating) cavity, and simultaneously adopt the helical antenna with circular polarization characteristics as the microwave radiator, and install it in the furnace cavity It cooperates with the magnetron and the "L" shaped waveguide composed of a vertical waveguide and a horizontal waveguide with a waveguide exit, and a microwave reflector. The cavity directly radiates high-speed rotating electromagnetic waves (microwaves), to replace traditional flat-panel microwave ovens that need to be equipped with stirring mechanisms such as motors and blades that stir the microwaves generated (emitted) by the magnetron, and turntable microwave ovens with waveguide nozzles on the side. The necessary loading turntable and its transmission system can overcome the problems of traditional turntable and flat-plate microwave ovens, such as complex structure, furnace weight, microwave radiation, and uneven heating of heated objects.

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