Patent ID: 7128770

Claim:
A cyclone dust-collector which filters out dust and dirt from drawn-in air at least two times, comprising: a multiple cyclone unit having a first cyclone and a plurality of second cyclones arranged at the outside of the first cyclone, for centrifugally separating the dust and dirt from the drawn-in air; a cover unit connected to the upper portion of the multiple cyclone unit, for allowing the first and the second cyclones to fluidly communicate with each other; and a dirt-collecting unit connected to the lower portion of the multiple cyclone unit, for collecting therein the dust and dirt centrifugally separated, wherein the first cyclone comprises: a suction port through which the dirt-laden air is drawn in; an inner case having a cylindrical shape and connected to the suction port; a grill disposed inside the inner case; and an air discharge outlet disposed at an upper end of the inner case and connected to the grill.