阅读说明：本技术 一种大功率微波旋转辐射器 (High-power microwave rotary radiator ) 是由 张伟燕 施亚玲 谭延君 于 2019-09-30 设计创作，主要内容包括：本发明公开了一种大功率微波旋转辐射器,它包括波导(1),固定在波导(1)同轴结构处的阻抗调谐块(2),安装在波导同轴结构内的内导体(3),内导体(3)安装在位于波导(1)上方的轴承(4)上,内导体(3)顶端与旋转电机(5)相连,内导体(3)与轴承(4)相连处的外周设有微波扼流筒(6),内导体(3)下端与辐射转盘(7)相连；辐射转盘(7)为3片,每片辐射转盘(7)上开设有微波透过的隙缝(8)。本发明结构设计合理,可实现大功率微波加热设备辐射馈能,可有效改善大功率微波馈能加热腔内电磁场不均匀分布现象。(The invention discloses a high-power microwave rotary radiator, which comprises a waveguide (1), an impedance tuning block (2) fixed at the coaxial structure of the waveguide (1), and an inner conductor (3) arranged in the waveguide coaxial structure, wherein the inner conductor (3) is arranged on a bearing (4) positioned above the waveguide (1), the top end of the inner conductor (3) is connected with a rotary motor (5), a microwave choking cylinder (6) is arranged at the periphery of the connection part of the inner conductor (3) and the bearing (4), and the lower end of the inner conductor (3) is connected with a radiation turntable (7); the number of the radiation turntables (7) is 3, and each radiation turntable (7) is provided with a slit (8) through which microwaves can penetrate. The invention has reasonable structural design, can realize radiation energy feedback of high-power microwave heating equipment, and can effectively improve the phenomenon of uneven distribution of an electromagnetic field in a heating cavity of the high-power microwave energy feedback.)

1. A high-power microwave rotary radiator is characterized by comprising a waveguide (1), an impedance tuning block (2) fixed at the coaxial structure of the waveguide (1), and an inner conductor (3) arranged in the waveguide coaxial structure, wherein the inner conductor (3) is arranged on a bearing (4) positioned above the waveguide (1), the top end of the inner conductor (3) is connected with a rotary motor (5), a microwave choking cylinder (6) is arranged at the periphery of the connection part of the inner conductor (3) and the bearing (4), and the lower end of the inner conductor (3) is connected with a radiation turntable (7); the number of the radiation turntables (7) is 3, and each radiation turntable (7) is provided with a slit (8) through which microwaves can penetrate.

2. A high power microwave rotary radiator according to claim 1 characterised in that the impedance tuning block (2) is a tapered metal block.

Technical Field

The invention designs a microwave radiator, and particularly relates to a high-power microwave rotary radiator with good heating uniformity.

Background

Moving the working load is one of the commonly used methods for improving the microwave uniformity at present, but for the tunnel type microwave heating system, the load moves linearly in the heating tunnel mainly along one main axis direction, so the method can only compensate the change in the direction, and the uniformity in the other two directions cannot be compensated, so the effect of improving the microwave uniformity is limited.

The mode stirrer is a commonly used means for improving uniformity in a microwave oven, generally comprises a multi-blade metal sector in the microwave oven, is arranged right below an energy feed port, changes the energy feed direction through the rotation of blades, has a simple structure, but has a complex action process, is difficult to accurately analyze and design, has low microwave efficiency during application, and is not suitable for wide popularization and application in high-power industrial microwave equipment.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to overcome the defects of the prior art and provide the high-power microwave rotary radiator with reasonable structural design and uniform heating efficiency.

The technical scheme is as follows: in order to achieve the above purpose, the invention adopts the technical scheme that:

a high-power microwave rotary radiator comprises a waveguide, an impedance tuning block fixed at a waveguide coaxial structure, and an inner conductor arranged in the waveguide coaxial structure, wherein the inner conductor is arranged on a bearing positioned above the waveguide, the top end of the inner conductor is connected with a rotary motor, a microwave choke cylinder is arranged on the periphery of the connection part of the inner conductor and the bearing, and the lower end of the inner conductor is connected with a radiation turntable;

The number of the radiation rotary tables is 3, and each radiation rotary table is provided with a slit through which microwaves can penetrate.

In the above high-power microwave rotary radiator, the impedance tuning block is a wedge-shaped metal block.

in the coaxial waveguide conversion link, the wedge metal block is used as an impedance changer, so that the matching of transmission impedance can be realized. The impedance variator transitions from a discontinuous step transition to a continuous smooth gradual transition, which is, at its simplest, a linear change. Under the guidance of the design principle, by means of CST simulation design software, the design length of the transition section and the slope of a straight line are adjusted, and meanwhile, a transmission electric field in the waveguide is observed, so that efficient continuous transmission of microwave energy from the waveguide to the coaxial structure is realized.

The invention loads a radiation turntable structure under a waveguide coaxial structure, and mainly has the main functions that microwave power on the coaxial structure is transmitted to the radiation turntable through an inner conductor serving as a probe, the inner conductor rotates under the driving action of a rotating motor, the inner conductor drives 3 pieces of radiation turntables at the lower end to rotate, and microwave energy passes through gaps on the radiation turntable, so that the microwave heating uniformity is improved.

Because the inner conductor is a microwave transmission assembly, the surface has current, if the microwave shielding design is not carried out, the problem of sparking will occur at the assembly gap between the inner conductor and the bearing, so that the bearing is thermally expanded, and finally the bearing is blocked. A microwave choking cylinder is designed at the fixed position of the rotating shaft, and the bearing is placed above the shielding cylinder to prevent microwaves from entering the bearing through the rotating shaft. After the improved rotary radiator is debugged at high power of 100kW, the temperature of the bearing is stabilized below 60 ℃, the bearing is free of blockage, and the operation is stable.

Has the advantages that: the improved high-power microwave rotary radiator has reasonable structural design, can realize the radiation energy feedback of high-power (25-100 kW) microwave heating equipment, and can effectively improve the phenomenon of uneven distribution of an electromagnetic field in a heating cavity of the high-power microwave energy feedback; the automatic regulation of the rotating speed of the rotator and the monitoring and control of the reliability of the rotating part can be realized.

Drawings

fig. 1 is a schematic structural diagram of a high-power microwave rotary radiator provided by the invention.

Detailed Description

The present invention is further illustrated by the following figures and specific examples, which are to be understood as illustrative only and not as limiting the scope of the invention, which is to be given the full breadth of the appended claims and any and all equivalent modifications thereof which may occur to those skilled in the art upon reading the present specification.

As shown in fig. 1, a high-power microwave rotary radiator comprises a waveguide 1, an impedance tuning block 2 fixed at the coaxial structure of the waveguide 1, and an inner conductor 3 installed in the waveguide coaxial structure, wherein the inner conductor 3 is installed on a bearing 4 positioned above the waveguide 3, the top end of the inner conductor 3 is connected with a rotary motor 5, a microwave choke cylinder 6 is arranged at the periphery of the connection part of the inner conductor 3 and the bearing 4, and the lower end of the inner conductor 3 is connected with a radiation turntable 7;

The number of the radiation turntables 7 is 3, and each radiation turntable 7 is provided with a slit 8 through which microwaves can penetrate.

In the above-mentioned high-power microwave rotary radiator, the impedance tuning block 2 is an oblique-wedge metal block.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.