Design And Experiment Of Microwave Heating Equipment

Microwave heating was used as a treatment of materials in industry as early as sixty years ago.Starting from the microwave oven,this kind of heating gradually comes into people's life and shows great potential for development.At present,the thermal effect of microwave is not only limited to heating food,but also plays a great role in various fields.Microwave heating has been widely used in medical treatment,new material preparation,material processing and so on.At present,the research on the interaction of microwave and human tissue is also a hot spot.These aspects jointly promote the research of the microwave heating system.At present,the design of the microwave heating system often uses HFSS software to optimize the electric field in the cavity and the reflection of the feed port.This method of simulation after processing experiments greatly reduces the cost of research.But in the process of design,the understanding of theory is often not enough.In the design,a lot of experience data is used to adjust the location or quantity of the cavity or feed port.Moreover,the influence of electric field uniformity is only considered in the design.The thermal parameters of materials are not considered,and the distribution of temperature field during heating is not considered.The dielectric constant of the material varies greatly in the condition of temperature change,and the dielectric constant of the material is used in the design process Often not enough.Therefore,this paper studies the contents of three parts for these problems.1.The relevant theories of the most important parts of microwave heating are studied.The definition of dielectric constant and the influence of dielectric constant on microwave heating are given.The change of dielectric constant with temperature and frequency is studied and analyzed.The basic theory of the heating cavity is studied,the resonant frequency and the Q value of the cavity are derived?2.The design theory of the gap antenna for microwave energy feed was studied.This paper provides a design method for narrow edge gap antenna of waveguide.The feasibility of gap antenna design is verified by experiments.3.According to the design requirements of the theory and the microwave thawing equipment,the joint simulation of the HFSS software and the ANSYS software is used.A set of microwave thawing equipment was designed,and the optimization method wasput forward,and the influence of each parameter in the design process was also put forward.The optimization process is reasonable,not a blind optimization.The optimization time is greatly reduced4.The resonant cavity perturbation method is improved from the resonant cavity perturbation theory,and the rectangular cavity perturbation method for measuring the wide range dielectric constant is proposed.The reliability of the method is verified by simulation and experiment.Compared with the original method,the measurement range and precision are greatly improved.