Patent ID: 7862637

Claim:
A multi-cyclone dust separator, comprising: a first cyclone unit that centrifugally separates dust from a dust-laden air stream drawn into the first cyclone unit through a first air inlet; a second cyclone unit that is formed inside the first cyclone unit, wherein the second cyclone unit comprises: a second cyclone body that comprises a second air inlet through which the dust-laden air stream enters the second cyclone body, a guide unit that imparts rotation to the dust-laden air stream upon entry of the dust-laden air stream into the second cyclone unit, an air discharge hole that is formed on a bottom surface of the second cyclone body, and an air discharge pipe that is fixed to the second cyclone body and is connected to the air discharge hole; and a dust blocking unit that prevents the dust separated by the first cyclone unit from entering the second cyclone unit through the second air inlet.