unit 220 may include a mounting protrusion not shown formed by outwardly protruding so as to not leak air and dust sucked in the case 120 into the mounting portion of the visualization device 200 of dust collection in particular the external surface of the collecting unit 220 which is protruded for the portion forward the mounting location of the turbine 160 and the protruded portion is formed with the suction inlet 222 that air and dust may be introduced into the collecting unit 220 the suction inlet 222 is formed to guide the flow of air into a tangential direction of the inside of the collecting unit 220 and air introduced inside the collecting unit 220 is moved while rotating along the inner surface the upper side of the collecting unit 220 is mounted with the dust collecting unit 240 in which air transferred while rotating and dust through the suction inlet 222 included in the air are received the dust collecting unit 240 is formed by the transparent material which may be exposed to the outside of the dust reception status and the inside of the dust collecting unit 240 is further provided with a foreign material separation unit 270 which generates a cyclonic flow to separate dust and air in addition the side portion of the dust collecting unit 240 is further provided with the foreign material discharge unit 400 which crushes the cyclonic flow of the foreign material separation unit 270 while introducing the outdoor air into the inside to discharge air collected in the inside of the dust collecting.