Suction appliance for cleaning purposes

Suction appliance for cleaning purposes, in particular, for cleaning floors, comprising:

• a dirt collecting container with a suction inlet and a suction outlet on which a filter is held;
• a suction unit for acting upon the dirt collecting container with negative pressure;
• a suction chamber between the suction unit and the filter with an external air inlet, via which external air can flow into the suction chamber to act upon the filter on the clean-space side;
• a valve device with a valve seat forming the external air inlet, and a valve body movable relative to the valve seat, the valve body in a closed position abutting sealingly on the valve seat and in an open position releasing the valve seat;
• and
• an actuating member, actuation of which causes the valve body to be transferred from the closed position to the open position;
• wherein the suction appliance comprises an energy storage device, which is adapted for energy that is to be stored to be supplied thereto by actuating the actuating member and for stored energy to be released therefrom for transferring the valve body from the closed position to the open position.