Microwave heating device

Abstract

The invention relates to a microwave heating device, wherein heating and drying of the microwave heating device are performed through industrial microwaves. According to the novel microwave heating device, intercoupling of a plurality of magnetrons is avoided due to the novel microwave power transmission and energy feedback mode and accordingly the output power and efficiency of the magnetrons is improved, the service life and the reliability of the magnetrons are improved, and accordingly the production is improved, the maintenance cost of the device is reduced, and energy resources are greatly saved. The microwave heating device comprises a rotatable metal outer cylinder and a metal inner cylinder which is provided with a microwave power radiation source; a coaxial annular chamber is formed in the metal outer cylinder; a supporting tube is arranged in the annular chamber; the supporting tube is provided with at least one microwave gap antenna group; the microwave gap antenna group is formed by a plurality of microwave gap antennas which are uniformly arranged surrounding the angular direction of the supporting tube; a waveguide exciter is connected with the microwave gap antennas through a waveguide flange plate; the microwave magnetrons are inserted into the waveguide exciter.

Description

technical field [0001] The present invention relates to the technical field of microwave energy application, in particular to a microwave heating device using industrial microwave heating and drying, especially suitable for high-yield material drying treatment and production, such as rice, wheat, corn and other food crops And dehydration, drying, insecticide, processing and other links of economic crops such as tea and tobacco. Background technique [0002] In the application of industrial microwave heating technology, box-type multi-cavity microwave heating methods are usually used, such as discontinuous production methods similar to household microwave ovens, which require intermittent heating and processing furnace by furnace, and the other is tunnel-type continuous production. In the operation mode, the material enters the tunnel heating furnace or heating kiln evenly on the conveyor belt. Under the action of microwave power, the material absorbs microwave power while wa...

AI Technical Summary

Problems solved by technology

For the latter tunnel furnace with continuous operation, due to the improper design of its microwave energy feeding method, when multiple magnetrons are used to feed energy into the furnace separately, due to the unavoidable gap between each magnetron Mutual coupling phenomenon, this structure not only makes the efficiency of a single magnetron low, affects the power output, but also causes the life of the magnetron to be shortened or even damaged

Secondly, the structure of this design will make the distribution of the microwave electric field acting on the material very uneven. At the same time, because the material to be dried is statically accumulated on the conveyor belt, it will affect the overall heating and drying effect, and the output will be limited. to high yield

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