| 摘要 |
An air circulation type vacuum cleaner having a casing with a suction port and an exhaust port, a suction blower placed to intake air with impurities through the suction port, a suction fan having a dust collecting filter placed on the outlet side of the suction blower to filter the impurities from the air. The vacuum cleaner also has at least one reflux pipe with an inlet portion placed on an outlet side of the suction fan in order to return the air discharged from the suction fan to an inlet side of the suction fan and at least one ejector installed on an outlet side of the reflux pipe. The suction force generated by the suction fan and the suction force generated by the vacuum pressure from the redirection of air in the reflux pipe are used together to improve the suction ability of the vacuum cleaner.
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