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高温介质的管道球体软密封(见图26),主要用于高温浮动球阀和活塞件的密封.高温球软密封中的球与密封座摩擦扭矩是极重要的球启闭性能参数.本文分析高温密封件间管子轴向因不同步膨胀造成密封座法向正压力,以及由此引起球转动摩擦力矩增大的情况.并探讨其消除的高温密封装配结构.(1)高温介质各密封件管子轴向不同步膨胀的误差值高温介质管道内,由于介质的渗透性,球体、密封座均为介质所包围.管子内壁接触介质,故温度与介质相同;管子外壁多是大气,介质热量不断通过管厚层向大气传导散失,因大气温度较低,故管厚层沿径向呈规律性降温变化.除厚壁管呈对数变化外,一般均呈线性变化:
High-temperature medium pipe ball soft seal (see Figure 26), mainly used for high temperature floating ball valve and piston seal.High temperature ball soft seal ball and seal seat friction torque is an important ball opening and closing performance parameters.This paper analyzes the high temperature The axial direction of the pipe between the seals due to non-synchronous expansion of the seal seat caused by the normal pressure, and the resulting ball rotation friction torque increases, and to explore the elimination of the high temperature seal assembly structure. (1) Axial non-synchronous expansion of the error value High-temperature medium pipe, due to permeability of the medium, ball, seal seat are surrounded by medium. Tube wall contact with the medium, so the temperature and the same medium; Due to the lower temperature of the atmosphere, the thickness of the pipe layer changes regularly along the radial direction. In addition to the logarithmic changes of the thick-walled pipe, the pipe generally changes linearly: