Miniaturized magnetron structure

Abstract

The invention belongs to the field of vacuum electronic devices, and particularly provides a miniaturized magnetron structure. According to the present invention, a neodymium iron boron or samarium cobalt permanent magnet material placed on an external support of a magnetron is adopted to replace an original ferrite magnetic ring so as to ensure the magnetic field intensity in an interaction space. The ferrite magnetic ring is not needed in the magnetron structure, and a neodymium iron boron or samarium cobalt permanent magnet is placed on the external support of the magnetron, so that the height and the width of the magnetron can be greatly reduced, and the magnetron structure is cuboid-shaped and can be matched with the shapes and the structures of the cooling fins and a filtering assembly synchronously, especially the filtering assembly. According to the invention, the output of an original same-direction choking coil from one end is improved into the output of a heterodromous choking coil from the left end and the right end, so that the miniaturized magnetron structure can stably work while being matched with a magnetic circuit structure. In conclusion, the invention provides the novel magnetron structure, and the miniaturization design of the magnetron structure is further realized.

Description

technical field [0001] The invention belongs to the field of vacuum electronic devices, and is mainly aimed at household microwave oven magnetrons, and proposes a new magnetron structure, a magnetic circuit system and a filter box structure, which effectively reduces the height and width of the magnetron, and further realizes the magnetron Control miniaturization. Background technique [0002] A microwave oven is mainly composed of a power supply, a magnetron, a control circuit, and a heating chamber. The power supply supplies high voltage to the magnetron, and the magnetron generates microwaves under the excitation of the power supply, and then transmits the microwaves to the heating chamber through a waveguide and an antenna. heating. The miniaturization of magnetrons has always been the main research direction of universities, enterprises, and research institutes, which not only improves the utilization rate, but also saves manufacturing costs. [0003] The magnetron is...

AI Technical Summary

Problems solved by technology

[0004] At present, the structure of the common magnetron is as follows figure 1 As shown, it includes: bracket 1-1, base 1-2, tube core 1-3, heat dissipation blade 1-4, filter assembly 1-5, antenna 1-6 and permanent magnet (upper magnet 1-7, lower magnet 1 -8), wherein the base is square, the bracket is installed on the base to form a closed magnetic circuit, the upper magnet and the lower magnet are symmetrically arranged inside the bracket and the base up and down, the die is installed between the upper magnet and the lower magnet, and the heat dissipation blades are arranged Around the tube core, the filter assembly is arranged on the bracket and connected to the tube core, and the antenna is arranged under the base and connected to the tube core; the magnetic circuit system of the magnetron is mainly composed of ferrite permanent magnets, magnetic poles (tube core internal structure), the working gap formed by the relative magnetic poles, and the closed magnetic circuit formed by the peripheral bracket and the bottom plate; among them, although the ferrite permanent magnet is relatively cheap and has a high Curie temperature (450 degrees), the ferrite permanent magnet The body permanent magnet is close to the tube core, resulting in a high magnet temperature (usually up to several hundred degrees) when the magnetron is working, which in turn limits the use of some permanent magnet materials that are lower in temperature resistance, stronger in magnetism, and more cost-effective than ferrite. application

[0005] In view of the above problems, the applicant of the present invention provides a flattened magnetron of a microwave oven using a symmetrical magnetic circuit in the patent document with a publication number of CN110379692A; The magnetic field at the center of the mounting frame is enhanced by an auxiliary magnet, thereby reducing the diameter and thickness of the ferrite magnetic ring, which realizes the miniaturization of the magnetron structure; however, in the magnetron structure, the ferrite is not completely avoided The use of the magnetic ring makes the size of the magnetron to be further miniaturized

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