Microwave heating device adopting phase scanning

Abstract

The invention relates to a microwave heating device adopting phase scanning. The device comprises a microwave generator, a waveguide power divider, a waveguide phase shifter, a microwave application cavity, no less than two pairs of microwave antennas and a phase scanning control system; the waveguide power divider has N (N is larger than or equal to two) routes of output, at least one route of output is connected with the waveguide phase shifter; the microwave antennas are divided into N groups, at least one group of input is connected with the output of the waveguide phase shifter, and the input of the other groups of antennas are directly connected with the output of the waveguide power divider; the phase difference between an input port of the waveguide phase shifter and an output portof the waveguide phase shifter is continuously adjustable; the phase scanning control system adjusts a phase shift angle of the waveguide phase shifter at a given speed; by scanning the phase difference among different groups of antennas, the movement of microwave strong field and weak field regions in a microwave application cavity is achieved, and the heating uniformity is improved; the microwave heating device adopting the phase scanning has large power capacity, and is suitable for industrial microwave large-scale production application.

Description

technical field [0001] The invention belongs to the field of microwave technology, in particular to a microwave heating device using phase scanning. Background technique [0002] Microwave heating is to use the microwave field to act on polar molecules to make them swing rapidly, and the internal energy of collision and friction is increased to achieve the purpose of heating. Since the microwave wavelength is much longer than that of infrared rays, its penetration depth is deep, and it can directly act on the inside of the material without heat conduction, so it has the advantages of fast energy transfer speed and low transfer loss. In addition, the heating mechanism of this kind of material self-heating, the thermal inertia of the system is small, the reaction speed of heating start and stop is fast, and flexible control can be realized. [0003] In practical applications, due to the effect of the metal boundary of the microwave application cavity and the influence of the ...

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Problems solved by technology

For example: the method of material stirring motion is only suitable for liquid or granular materials; the method of multi-mode cavity and mode disturbance, due to the complex dielectric properties and shape of the material, it is difficult to analyze all the modes theoretically, so it is difficult to judge How many modes are there in the final cavity and how uniform the field distribution is; multi-antenna distributed energy feeding, due to the effect of the boundary conditions of the metal cavity, its effect is different from that of free space, and there will still be obvious distribution of cold and hot areas in the end; solid state The source provides good amplitude and phase control characteristics, but there are no examples for high-power industrial applications above tens or hundreds of kilowatts

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