Huilongshan Hydropower Station is equipped with a 2×36 MW axial-flow paddle turbine generator unit,with an installation elevation of-8 m and a tailrace tunnel length of 120 m.The working seal of the generator unit has been modified and overhauled for many times,but the water sealing effect is not good.This paper analyzes the reasons for the failure of previous working seal modification,and finally studies and modifies a kind of working seal for hydro-generators with packing independently,which completely solves the problem of high water leakage from working seal.This seal has obtained the national utility model patent.
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