Patent ID: 8393048

Claim:
Suction device for cleaning purposes, comprising: a dirt collection container, which comprises a suction inlet, a first filter arranged at a first suction outlet, a second filter arranged at a second suction outlet, a first suction line and a second suction line, respectively following the first filter and the second filter, via which the dirt collection container can be subjected to negative pressure, a first external air inlet and a second external air inlet which allow external air to flow into the first suction line and into the second suction line, respectively, in order to subject the first filter and the second filter, respectively, to external air on a clean space side of the filters, and a first closing valve and a second closing valve for closing the first external air inlet and the second external air inlet, respectively, a first suction unit for subjecting the dirt collection container to the negative pressure via the first suction line and the first filter, and a second suction unit for subjecting the dirt collection container to the negative pressure via the second suction line and the second filter, and wherein: the first suction line and the second suction line are configured as suction channels that are spatially separated from each other and are sealed off relative to each other on the clean space side at least during cleaning of the first filter and the second filter, when the first closing valve is in an opened position, there is a fluid connection from the clean space side of the first filter to the first suction unit through the first suction line, and when the second closing valve is in an opened position, there is a fluid connection from the clean space side of the second filter to the second suction unit through the second suction line.