E23l Microwave Performance Improvement Research

With the continuous improvement of living standards, microwave oven already became a kind of indispensable household appliances. As customers speaking, the performance requirements of microwave oven are also more and more high.If the matching of microwave oven is bad, it can not reach the expected effect. When no-load or light load, spark, local hot change and leakage seriously affected the normal work of the microwave oven.In order to solve E23L microwave performance problems, such as melting shaft, harmony, the paper puts forward HFSS simulation to improve E23L performance improvement research. HFSS is a kind of three-dimensional electromagnetic field simulation software based on finite element method. It has advantages to medium of contain loss multi-mode high-frequency harmonic cavity simulation. HFSS can intuitive display electromagnetic field distribution and door leakage wave around. Combining simulation and experiment to study is more efficient and more accurate which is the inevitable trend of research and development.This article through studies concluded that:1. When the cold matching of microwave oven, load VSWR is at 2-3.The cavity body of microwave oven absorbs microwave energy to maximum load. The magnetron is reflected back minimum energy wave which make magnetrons recess maximum efficiency of energy to utilize. It ensures the life of the magnetron in load. No-load VSWR is at 5-15.It match the microwave cavity body load absorbing microwave energy with the state of energy magnetrons reflected back. The microwave oven no load circumstances will not damage microwave oven, and guarantee the life of products in no-load condition magnetron;2. It is satisfy to no-load protection function requirements using the 90℃, 110℃, 120℃thermostat. After cooking test, 90℃and 110℃thermostat cannot satisfy the microwave oven light load project cooking requirements. The 120℃thermostat can meet the requirements;3. The microwave oven uses 12mm and 14mm shaft and turn ring. The microwave oven is not evenly distributed field fa?ade with U plate convex platform field. The focus in 14mm shaft and turn ring in U plate convex platform are relatively weak than axis 12mm. Appearance focus and convex platform for harmony blend door and field left hidden danger.4. With the change of microwave oven door width, uneven distribution of field surface appearance has gathered switch group of B. With the crack increases from 0 mm to 0.1 mm, appearance increased. With the crack increases from 0.1 mm to 0.5 mm, field facade little change. To reduce thickness of the door is good to melt door but there is no big melting shaft to improve.5. U plate manufacturing error has little impact to melting shaft and door;6. After testing, 26mm back plate can solve the problem of melting shaft and door.The microwave performance can meet demands which validate the correctness of the simulation. The overall assessment results of 26mm back plate conform to export microwave oven cook performance test standards.