Fully coherent modular microwave heating device

Abstract

In the invention, a microwave heating device is divided into several heating modules connected in series along a Z axis. Only a fundamental mode TE10 mode is propagated in different microwave feedingwaveguides in each module, and the electric field direction only has an X-axis component. The working microwaves in the different microwave feeding waveguides in each heating module are coherent and share the same phase, and the isolation degree between the working microwave feeding waveguides of different heating modules is very high. Non-coherent microwave sources can be employed in different heating modules, or coherent microwave sources can be employed in different heating modules arranged along the Z axis, so the working microwaves in microwave feeding waveguides belonging to different heating modules which are aligned and adjacent along the Z axis have an equal amplitude and inverted phases, and TEn0 waves which are propagated in a -Y direction from top to bottom and along a Y axis from bottom to top are excited in a heating cavity composed of cavities belonging to different heating modules, n is an integer and is greater than or equal to 2. The device can be used for heating various materials or speeding up chemical reactions.

Description

technical field [0001] The present invention relates to microwave heating equipment. Specifically, it relates to a compact microwave heating device that utilizes a high-order mode to uniformly heat materials with high efficiency. Background technique [0002] Microwave energy can be used in place of various conventional heating methods. Microwave heating equipment uses microwave energy to heat a variety of materials, including but not limited to wood, grain, spices, dairy products. In the field of microwave chemistry, microwave energy is used to speed up various chemical reactions. Microwave energy is also used in the production of various materials such as nanomaterials and synthetic diamonds. [0003] In the traditional heating process, heat is conducted from the outside to the inside of the heated object, which belongs to surface heating, resulting in uneven temperature inside and outside the heated object. In microwave energy heating, microwaves are heated by the act...

AI Technical Summary

Problems solved by technology

At the frequency of the working microwave, for a microwave feeder, after selecting its position, shape, and polarization direction, it is very difficult to determine the intensity of excitation of hundreds of modes in the heating cavity. is also extremely complex

In large-scale microwave heating equipment, hundreds of magnetrons are required as microwave sources, so the number of corresponding microwave feed ports can be as many as hundreds! The complexity of the above problems is beyond people's imagination

[0010] Second, heating efficiency issues

Since the different magnetrons used in the heating chamber are independent of each other, the microwaves generated by them are irrelevant and their spectrums are independent of each other. For the microwaves generated by any magnetron, due to the hundreds of The amplitude and phase of the mode is difficult to control and may overflow from multiple other feed ports

Although large-scale microwave heating equipment can reduce the mismatch reflection of the microwave feeder by selecting the volume, shape and density of the material to be heated, the microwave overflow loss between multiple microwave feeders is difficult to avoid

[0013] Third, the energy leakage problem of large microwave heating equipment

Hundreds of microwave feed ports have different shapes, positions and polarization directions. In addition, the microwave signals fed from each feed port are irrelevant to each other, so that the serious energy leakage problem of microwave energy through the feed port and the discharge port leads to The loss of microwave energy, especially the electromagnetic interference to the environment caused by large-scale microwave heating equipment, even poses a threat to personal safety

In order to reduce energy leakage, it is often necessary to install a very long filter structure at the inlet and outlet, resulting in a great increase in the length of the equipment

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