透气元件气道结构和材质对热应力的影响

Influence of air way structure and material parameters on thermal stress of purging plugs

为了降低透气元件热应力,以狭缝型透气元件为分析对象,采用ANSYS分析了吹氩结束时狭缝宽度、狭缝厚度、内外圈狭缝距中心距离、材质热导率、弹性模量、热膨胀系数对透气元件中心轴线及狭缝最大热应力的影响。结果表明:狭缝宽度和厚度增加,透气元件狭缝处最大热应力降低;狭缝与透气元件顶面中心的距离对狭缝热应力影响很小,对透气元件中心轴线上的热应力有一定影响;提高透气元件材料热导率,降低材料弹性模量或者热膨胀系数,均可降低透气元件的最大热应力。

In order to reduce the thermal stress of purging plugs,the slit purging plugs were analyzed by ANSYS software.The influences of the slit width,slit thickness,distance between inner/outer slit and the center,thermal conductivity,elastic modulus and thermal expansion coefficient of the material on the maximum thermal stress of the central axis and the slit of the purging plug when the Ar-blowing ends were analyzed.The results show that the increase of slit width or thickness decreases the maximum slit thermal stress;the distance between the slit and the top surface center of the purging plug has very limited influence on the slit thermal stress but some influence on the thermal stress of the central axis of purging plug;the increasing thermal conductivity of the purging plug decreases the elastic modulus or the average thermal expansion coefficient of the material,which can reduce the maximum thermal stress of the purging plug.