Anti-interference integrated microwave heating element used in vacuum state

Abstract

The invention discloses an anti-interference integrated microwave heating element used in a vacuum state. The anti-interference integrated microwave heating element comprises a closed shielding box, and the interior of the shielding box comprises a microwave power supply assembly and a magnetron assembly; the microwave power supply assembly comprises a microwave power supply oil tank, microwave power supplies and an oil cooling heat exchanger are arranged in the microwave power supply oil tank, one end of each microwave power supply is provided with a power supply control complex line, and twoends of the oil cooling heat exchanger are provided with a heat exchanger water inlet pipe and a heat exchanger water outlet pipe respectively; the magnetron assembly comprises two rows of magnetronswith water cooling jackets; the water cooling jackets of each row of magnetrons are connected in series through parallel cooling water pipes; and the microwave power supplies communicate with the corresponding magnetrons with the water cooling jackets through power cables. The microwave element is placed in a vacuum environment, the shielding box is connected with the atmosphere through a pipeline, the microwave element is completely in a normal pressure state, the interference of vacuum ionization with the magnetrons is eliminated, and the magnetrons can work normally in a vacuum device.

Description

technical field [0001] The invention relates to the field of microwave vacuum drying, in particular to an anti-interference integrated microwave heating element used in a vacuum state. Background technique [0002] Microwave heating is a kind of radiant heating. Microwaves act directly on objects, so that the inside and outside are heated at the same time, without convection or conduction to transfer heat, so the heating speed is fast, the thermal efficiency is high, the processing time is short, and the temperature inside and outside the material is uniform. Energy saving, high drying efficiency and good drying quality. Microwave vacuum drying equipment is a combination of microwave energy technology and vacuum technology. It has both the advantages of microwave drying and vacuum drying, and overcomes the shortcomings of conventional vacuum drying, such as high temperature, long time, and large energy consumption. In the general material drying process, The drying temperat...

AI Technical Summary

Problems solved by technology

[0004] 1. When the microwave core heating element is used in a vacuum state, it will produce a vacuum ionization phenomenon, which will cause the magnetron to fail to work. Therefore, the existing microwave vacuum drying equipment can only install the magnetron outside the vacuum container ( As shown in the figure), the microwave emission window is closed, and then the vacuum container is heated

This structure makes it impossible to design large-scale microwave vacuum drying equipment, let alone design multi-layer microwave vacuum heating equipment.

[0005] 2. Each microwave generator-magnetron needs a separate microwave power supply, which outputs a high voltage of 4000 volts. The power supply needs to be cooled by oil. At the same time, the farther the power supply is from the magnetron, the more attenuation the current Seriously, the energy consumption of the equipment will be increased. Therefore, the distance between the power supply and the magnetron needs to be kept as short as possible, which also affects the enlargement of the equipment.

[0006] 3. Each microwave heating element needs auxiliary facilities such as water cooling, oil cooling, power cables, control cables, etc. How to integrate these elements together in a vacuum state, that is, to meet the needs of the magnetron to work normally in a vacuum state , and to ensure the reliability of the equipment in a vacuum state, in order to produce large-scale, multi-layer microwave vacuum drying equipment, is an unresolved problem

After the material is heated, it evaporates and produces a large amount of water vapor. Although the resonant cavity is inside the vacuum tank, there is a vacuum pump outside the vacuum tank to exhaust the air. However, since the water vapor has no driving force, the water vapor is accumulated in the resonant cavity and cannot be discharged. normal drying

Images