Patent ID: 6484354
Filing Date: 2002-11-26
Classification: A47L

Abstract:
An air circulation type vacuum cleaner, comprising:a casing having a suction port and an exhaust port; a suction blower having an inlet and an outlet, wherein the inlet is placed on the suction port of the casing to intake air with impurities through the suction port of the casing; a suction fan having an inlet and an outlet; a dust collecting filter, wherein the filter is placed after the outlet of the suction blower, and wherein the dust collecting filter removes a portion of the impurities from the air; at least one reflux pipe with an inlet and an outlet, wherein the inlet of the reflux pipe is placed on the outlet side of the suction fan and wherein the outlet of the reflux pipe is arranged to return air discharged from the outlet side of the suction fan to the inlet side of the suction fan; and at least one ejector installed on the outlet side of the at least one reflux pipe, wherein the at least one ejector is configured to discharge air towards the suction fan to thereby increase a suction of the vacuum cleaner.