Assembly air suction hose, storage host host cavity, the cat guarantee host air inlet and host cavity of the air inlet physiognomy anastomosis. Host tuyere around rubber block or rubber ring to seal, deposit filter dust cavity with the outside world for directly connected, the sealing requirements more strict, exhaust opening and hose socket, must be closely, can not have air leakage phenomenon. In addition to exhaust opening outside, dust cavity around with the outside world are closed, forming a closed cavity, the host cavity and dust cavity is through the filter bag around the rubber ring connected, some horizontal suction hose in this again around a rubber seal. So, from host cavity air inlet to dust chamber, in addition to a suction tuyere and external connected outside, the rest all closed, so as to ensure the flow only from suction nozzle place into the channel, utmost ground into the dust cavity exhaust opening, obtained the best suction effect.