Patent ID: 7776115

Claim:
A multi cyclone dust-separating apparatus comprising: a cyclone unit having a first cyclone, which is disposed in such a manner that a longitudinal axis thereof is substantially vertically arranged and which separates relatively large dust or dirt from air drawn in through a first air inflow part, and a plurality of second cyclones, each of which is disposed in such a manner that longitudinal axes thereof are substantially vertically arranged, each of which has a second air inflow part to communicate with the first cyclone and an air discharging part to discharge the air, and each of which separates relatively minute dust or dirt from the air drawn in through the second air inflow part; and a dust collecting unit disposed below the cyclone unit to collect and store the dust or dirt separated from the air by the cyclone unit, wherein each of cyclone bodies of the plurality of second cyclones is formed in a convex cylinder shape so that a diameter thereof in the vicinity of an entrance of the air discharging part is a maximum diameter.