异形化微波炉用磁控管的研究

Research on Special-Shaped Magnetrons for Microwave Ovens

微波炉用磁控管作为微波炉中最重要的器件之一,正在朝小型化、扁平化的方向发展,具有广阔的市场前景和巨大的经济效益。针对磁控管扁平化的需求,本文设计了一种十六腔的异形化微波炉用磁控管,阳极筒沿x轴方向长度为48.5 mm、沿y轴方向宽度为40 mm,阴极沿x轴方向长度12.5 mm、沿y轴方向宽度为4 mm,利用CST仿真软件对异形化磁控管进行建模和仿真分析,该磁控管在工作电压为4300 V、磁通密度为0.17 T的条件下,阳极电流为1.31 A,在2.466 GHz输出了4141 W的峰值输出功率,效率约为73.5%。结果显示对磁控管管芯进行异形化设计后,可以增大阴极发射表面积,在阴极发射能力与圆柱形微波炉磁控管保持一样的情况下,提高了阳极电流和输出功率,占空比为50%时的平均输出功率约为2070 W,输出效率与现有圆柱形微波炉用磁控管的基本一致。

As one of the most important devices in microwave ovens,magnetrons are developing in the direction of miniaturization and flattening,which has broad market prospects and huge economic benefits.Aiming at the flattening requirement of magnetrons,a special-shaped magnetron with 16-cavity is designed for microwave oven.The length of the anode cylinder along x-axis direction is 48.5 mm,and the width along y-axis direction is 40 mm;the length of the cathode along x-axis direction is 12.5 mm,and the width along y-axis is 4 mm.The special-shaped magnetron is modeled and simulated by CST software.With a working voltage of 4300 V and a magnetic flux density of 0.17 T,the anode current of the magnetron is 1.31 A,the peak output power is 4141 W at 2.466 GHz,and the efficiency is about 73.5%.The results show that the special-shaped design of the magnetron die can increase the cathode emission surface area,so the anode current and output power can be improved when the cathode emission capability keeps the same as those of cylindrical magnetrons;the average output power at the duty cycle of 50%is about 2070 W,and the output efficiency is basically the same as those of the existing cylindrical magnetrons for microwave ovens.