Patent ID: 6790016
Filing Date: 2004-09-14
Classification: F04D

Abstract:
A motor and blade unit comprising:a) a motor; and b) a blade unit including: i. a fundamental body being a metal block with a top end, a bottom end, a hollow interior and a conical profile, a slant of said conical profile increasing water flowing speed, said top end of said fundamental body having a through hole receiving a shaft driven by the motor to rotate said fundamental body; and, ii. a plurality of blades protruding from a surface of said fundamental body, said plurality of blades including multi-sectioned blades of different sizes, guiding water to flow so as to separate impurities from the water to prevent the motor from being clogged by impurities, further comprising: a cover member fitted around said shaft and having a recessed groove in a center thereof receiving a spring; and an oil seal sandwiched and pressed between said spring and a friction ring sealing a gap between said cover member and said shaft to prevent leakage.