Analysis of Excessive Water Mixing in Water Guide Bearing Oil Groove of Hydro-turbine Units
Excessive water mixing in the oil in water guide bearing oil groove is observed in the No.3 unit in Gaobazhou Hydropower Station after the C-level maintenance.Inspection shows that the contact type comb tooth seal of the cover plate of the water guide bearing oil groove does not fit well with the main shaft that a large clearance is found.Further observation and analysis show that heat exchange occurs between the air inside and outside the oil groove due to the clearance,resulting in the accumulation of condensed water at the contact place of the seal and the main shaft.The con-densed water then flows into the oil groove along the shaft.After the accumulation of a long period,it ultimately leads to excessive water mixing in the oil.By replacing the seal,cleaning the oil tank,and replacing the oil,the problem is fi-nally solved.
water guide bearing oil tankoil mixed with watercomb tooth sealheat exchange
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