Vacuum cleaner filtration system with filter cleaning mode
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United States of America Patent
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Sep 12, 2017
Issued Date -
N/A
app pub date -
Dec 22, 2014
filing date -
Dec 22, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A vacuum cleaner filtration system having a primary separation system and a filter downstream of the primary separation system. The filter has an upstream side to receive an airflow exiting the primary separation system, and a downstream side fluidly opposite the upstream side. The system has a vacuum fan, a primary suction path between the filter's downstream side and the vacuum fan, a valve in the primary suction path and configured to selectively position to block the primary suction path and create a closed passage at the filter's downstream side, and a secondary suction path between the filter's upstream side and the vacuum fan. A secondary filtration system is in the secondary suction path to separate dirt from an airflow passing therethrough, to thereby clean dirt from the filter's upstream side. A nozzle may be provided to concentrate the air flow as it enters the secondary suction path.
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