Patent ID: 7470299

Claim:
A vacuum cleaner comprising: a cleaner body; a nozzle unit in fluid communication with the cleaner body to draw in dust-laden air from a surface to be cleaned; and a multi-cyclone dust separator mounted in the cleaner body to separate dust from the dust-laden air drawn in through the nozzle unit, the multi-cyclone dust separator comprising at least three dust separation units, including a first dust separation unit, a second dust separation unit, and a third dust separation unit sequentially separating dust particles according to respective sizes, wherein the second dust separation unit has a plurality of second cyclone chambers, and air discharged from the plurality of second cyclone chambers are combined and flow into the third dust separation unit, wherein the third dust separation unit has at least one third cyclone chamber, and comprises an upper path formation member to guide air discharged from the second dust separation unit toward the at least one third cyclone chamber.