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答:轴向位移、相对膨胀是汽轮机运行中所需监视的众多参数中至关重要的两个,这两个参数数量级较小、轴向位移只允许零点几个毫米,差胀也只几个毫米。现在的差胀、轴向位移仪表的精度已足以满足所要求准确度,但若初始零位(即汽轮机所要求的大轴零位)的定位不准,即使是精度再高的仪表也不能准确反映轴向位移或相对膨胀的值。初始零位一般是这样确定的:汽机专业的检修人员先用千斤顶从平行大轴的水平方
A: The axial displacement and relative expansion are two of the many parameters that are required to monitor the turbine operation. The two parameters are orders of magnitude smaller and the axial displacement only allows a few millimeters of zero and only a few differential expansion Mm. The current differential expansion, axial displacement meter accuracy has been sufficient to meet the required accuracy, but if the initial zero (ie, the required position of the turbine shaft zero) is not accurate, even if the accuracy of the instrument and then high accuracy can not be accurate A value that reflects axial displacement or relative expansion. The initial zero is generally determined as follows: Steam professional maintenance personnel first with the jack from the horizontal axis of the parallel