Patent ID: 7547337

Claim:
A multi dust-collecting apparatus comprising: a first dust-collector to separate dirt particles from drawn-in air by using a gravity and an inertia, the first dust-collector having a first housing forming an exterior contour of the first dust-collector and having a first inlet through which the drawn-in air flows in and a first outlet through which the drawn-in air is discharged and a suction pipe to guide an external air towards an inside of the first housing and downwards; a second dust-collector arranged along a circumference of the first dust-collector to separate minute dirt particles from the air flowing from the first dust-collector using a centrifugal force; a cover unit disposed above the first and the second dust-collectors to guide the air discharged from the first dust-collector towards the second dust-collector and to discharge the air discharged from the second dust-collector to the outside; and a dirt receptacle unit to collect the dirt particles separated from the air in the first and the second dust-collectors, wherein the suction pipe comprises: a horizontal portion penetrating through the second dust-collector and the first housing of the first dust-collector to guide the external air towards an inside of the first housing; and a vertical portion disposed in parallel to the axis of the first housing and having one end connected with the horizontal portion and the other end connected with the first inlet, the vertical portion to guide the air flowing from the horizontal portion in a lower direction of the first housing.