| 摘要 |
A vacuum cleaner comprises first and second devices 116,125 for separating dirt and dust from an airflow through the cleaner. The dirt and dust separated by the first and second devices 116,125 is deposited at the bottom of a collection chamber 112. The dirt and dust separated by the second device 125 is transferred to the bottom of the collection chamber 112 via a duct which includes a first valve member 124 for closing the passageway and retaining dirt in said passageway and a second valve 136 member which is arranged to close the passageway when the first valve member is opened by an actuator. The first valve 124 is normally closed in use to prevent air from leaving the chamber 112 along the duct 133 instead of forming a proper cyclonic flow in the chamber 112. The actuator periodically opens the valve 124 to release the collected dirt and dust into the bottom of the chamber 112 simultaneously closing the duct 133 with second valve so as to temporarily prevent air from leaving the chamber 112 along the duct 133 whilst the collected dirt and dust is released. In this manner the dirt and dust from both devices can be collected together and preferably compacted by a single compaction auger 120. |
