CAJ | 학술논문

为实现吹膜挤出机在电磁感应加热条件下能效的定量分析，对吹膜挤出机电磁感应加热的三维有限元模型进行了研究，导出了对应于指定机筒和螺杆材料的电流透入深度与电磁感应加热器的各设计参数之间的关系；分析了挤出机的机筒与螺杆等关键部件在电磁感应三段式分区加热条件下的磁场分布、电流密度场分布及焦耳热能分布的相对趋势。结果表明，感应磁场主要分布在机筒内表面，而相应的感应电流主要分布在机筒外层，且当机筒上缠绕的3组匝数相同的电磁感应加热线圈中加载有大小相等、方向相同的交变电流时，电流密度和产生的焦耳热能集中在机筒和螺杆的中部，而适当增加进料段与计量段加热区所对应的两组线圈匝数可获得较为均匀的电磁感应加热效果。相对于电阻式加热，电磁感应加热的能量损耗较小，是一种环保节能的吹膜挤出机加热方式。
위실현취막제출궤재전자감응가열조건하능효적정량분석，대취막제출궤전자감응가열적삼유유한원모형진행료연구，도출료대응우지정궤통화라간재료적전류투입심도여전자감응가열기적각설계삼수지간적관계；분석료제출궤적궤통여라간등관건부건재전자감응삼단식분구가열조건하적자장분포、전류밀도장분포급초이열능분포적상대추세。결과표명，감응자장주요분포재궤통내표면，이상응적감응전류주요분포재궤통외층，차당궤통상전요적3조잡수상동적전자감응가열선권중가재유대소상등、방향상동적교변전류시，전류밀도화산생적초이열능집중재궤통화라간적중부，이괄당증가진료단여계량단가열구소대응적량조선권잡수가획득교위균균적전자감응가열효과。상대우전조식가열，전자감응가열적능량손모교소，시일충배보절능적취막제출궤가열방식。
In order to achieve quantitative analysis of energy efficiency of the blown film extruder in electromagnetic induction heating condition,three dimensional finite element model of the extruder in electromagnetic induction heating condition were studied. The relationships between the current penetration depth with specified barrel and screw material and various design parameters of the electromagnetic induction heater were exported,the relative tendency of magnetic field distribution,current density field distribution and Joule heat field distribution of key components in extruder such as extruder barrel and screw in the three section type electromagnetic induction heating condition was analyzed. The simulation data prove that the induced magnetic field is mainly distributed on inner surface of the barrel,the corresponding induced current is mainly distributed on external layer of the barrel, and when the three group wound electromagnetic induction heating coils with the same number of turns at the barrel are loaded with alternating current of equal size and same direction,the current density and the Joule heat energy are concentrated in the intermediate section of barrel and screw. Increasing the number of turns of the two coils corresponding to the feeding section and metering section properly can obtain more uniform electromagnetic induction heating effect. With respect to the resistor type heating,the electromagnetic induction heating has low energy loss,so it is an environmentally friendly and energy-saving heating method during the blown film extrusion process.