电路参数对石墨加热元件发热特性的影响规律研究

Research on influence law of circuit parameters on heating characteristics of graphite heating elements

电路参数是石墨加热元件发热性能的决定性因素,对电路参数的影响规律研究是高性能、高可靠性石墨加热器设计的基础。对石墨加热装置的失效过程进行研究,确定发热元件可靠性量化指标——温度均匀度;在此基础上,确定对加热元件热输出性能进行量化的四个电路参数:加热元件厚度、发热条宽度、发热条缝隙、缝隙处的倒圆半径;对发热电路进行参数化建模,并采用有限元电热耦合仿真对加热元件电路参数对加热能力和可靠性的影响机理进行研究。结果表明:加热元件的厚度决定了其热输出能力,而其余三个电路参数决定了加热元件的可靠性。本文的研究成果对高性能石墨加热装置的研制具有重要的支撑作用。

Circuit parameters are the decisive factors for the heating performance of graphite heating elements,and the research on the influence of circuit parameters is the basis for the design of high-performance and high-reliability graphite heaters.The failure process of graphite heating device is investigated,and the reliability quantitative indexes of heating element,temperature uniformity are determined.Four circuit parameters to quantify the output performance are advanced,including the thickness,width of the strip,gap between the strips and radius of the gap rounding.The mechanism of influence of circuit parameters on heating capability and reliability is investigated through coupled thermal electric finite element method analysis.The results show that the thickness can determine the heat output capability,while the remaining three circuit parameters can determine the reliability.The advancements in this paper play an important role in the development of high performance graphite heating device.