Design Of Opening Shaped Induction Coil And Multi-Field Coupling Numerical Of Induction Brazing

With the improvement of people's living standards,the demand for electrical products that replace domestic work is increasing.Therefore,it is imperative to realize the automation and intelligence of household appliances production lines.The traditional induction coil is a spiral coil.The workpiece needs to be set inside of the coil when induction heating and the spiral coil cannot be applied to an automatic production line.In this study,five kinds of open-type induction coils were designed.The design ideas and winding methods of the special-shaped coils were discussed in detail,and the heating of the induction coils was calculated by finite element method.Based on Maxwell's equations and heat transfer differential equations,this paper selects numerical calculation methods that suitable for induction brazing process,and establishes a physical model for induction brazing.In the research,the three-dimensional model of five open-type induction coils was established using finite element method,and a magnet model suitable for different coils was established.In the established finite element model,the physical property parameters of the material with changes in temperature were taken into account.In this study,an experimental platform of temperature testing for induction brazing was set up.The curve of the surface temperature of the workpiece during induction heating was measured and the heating efficiency of different coils was analyzed.The results comparison between the test and the calculation shows that the two results are in good agreement with each other,which verifies the accuracy of the calculation method and finite element model in this paper,and provides theoretical guidance for coil design and numerical analysis.The electromagnetic field and temperature field of different materials such as steel-steel,steel-copper,copper-copper were studied,and the current,frequency and other process parameters was confirmed for different shaped coils in a certain period of time.The results show that the coil structure determines the distribution of the magnetic induction intensity,which determines the distribution of the induction brazing temperature field.Therefore,in order to obtain the required temperature field,a reasonable design of the coil structure is required.Studies have shown that for homogenous brazed joints,the distribution of magnetic induction intensity is similar to that of the temperature field,and the temperature distribution is uniform.While there are large differences between the two types of brazed joints,the temperature of the copper tube is higher than the temperature of the steel tube.Evenly,when the steel-copper heterojunction is inductively heated,the copper tube temperature rises rapidly and the temperature is high.