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对汽轮机设备来说,通汽部分轴封处的间隙是非常小的。其数值一般要求在0.25～0.40公厘范围之内,加之其结构复杂,结果给测量工作带来了很大的不便。特别是对轴封顶部间隙的测量,一般发电厂中只能采用压胶布的方法估计其概略数值,而不能准确的测得其间隙的实际数值。但是,一般对轴封间隙的要求是比较严格的。如果间隙调正过大,即会引起汽轮机效率的降低,甚至由于汽封的大量漏汽经过轴承混入油系统。如果间隙调正过小,就将会引起汽轮机动静部分的摩擦,甚至造成严重事故。因此,在汽轮机大修时,应仔细的调整和测量轴封间隙。在测量轴封间隙时,一般对于两侧辐向间隙可以
For steam turbine equipment, the clearance at the shaft seal of the steam section is very small. Its value is generally required within the 0.25 ~ 0.40 mm range, coupled with its complex structure, the results of the measurement has brought great inconvenience. In particular, the measurement of the clearance at the top of the shaft seal can only be estimated by using the adhesive tape method in a power plant, and the actual value of the clearance can not be accurately measured. However, the general requirements of the shaft seal clearance is more stringent. If the clearance is adjusted too large, it will lead to the reduction of steam turbine efficiency, even as a large amount of steam leak through the bearings into the oil system. If the clearance adjustment is too small, it will cause the static and dynamic parts of the turbine friction, and even cause serious accidents. Therefore, the turbine repair, should be carefully adjusted and measured seal clearance. In the measurement of shaft seal clearance, it is generally possible to radiate the clearance to both sides