Industrial microwave equipment discharge causes and preventive measures
Industrial microwave equipment in actual operation, we often find in the heating process will produce high breakdown phenomenon. This breakdown There are several possible reasons:
1, the oven cavity some structural defects, such as metal burr, as a result of microwave discharge slit lap sparking;
2, air or water vapor furnace gas mixture breakdown;
3, some of the high dielectric constant material in particulate form as indirect contacts due to particle concentration on the cause dielectric breakdown field strength, causing local overheating, leading to overheating of the air-frequency breakdown.
No matter what causes the breakdown and discharge, especially near the mouth occurred in the waveguide coupler waveguide feeder discharge will cause the avalanche breakdown, then it will cause the microwave source and circulators damage or injury, and this is vital.
Because the current high-power microwave source and the ring's price is substantial, whether pipe or circulator shutdown will result in damage to be repaired, increasing production costs, affecting the yield and efficiency.
To this end, we design and processing should seek to smooth the surface of the oven cavity, especially welds or seams to be no obvious gaps, to ensure good contact, in order to prevent the discharge process due to moisture caused by high power density breakdown of the gas can be fed with the mouth of the waveguide to move from the top or bottom of the slot antenna, feeder mouth upwards, thus avoiding the mouth caused by moisture entering the waveguide waveguide lights to protect the circulator and the safe operation of the magnetron.

 

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