Festool Gmbh

Nilfisk-advance A/s

Rainer Hafenrichter

Klaus Dietz

Jan Kopf

Martin Kienzle

Günther Werbach

A suction device with a suction device housing (), in which a suction turbine () for generating a suction flow (S) is arranged, the suction turbine () having a suction turbine inflow opening (A), through which the suction flow (S) can flow into the suction turbine () and at least one suction turbine outflow opening (B), through which the suction flow (S) can flow out of the suction turbine (), wherein the suction device housing () has a suction inlet () for letting in the suction flow (S) and a dust collecting chamber () for collecting dust contained in the suction flow (S), wherein a filter element () for retaining dust in the dust collecting chamber () is arranged between the dust collecting chamber () and a suction turbine inflow opening (A) of the suction turbine (). The suction turbine inflow opening (A) of the suction turbine () is connected to at least one cooling air duct (), which has a duct inflow opening (A,A,) through which cooling air (KL) from an area surrounding the suction device () can flow past the filter element () to the suction turbine ().

Suction device

The invention relates to filter cleaning in a vacuum having a switchable flap element, the cleaning of the filter or of parts of the filter being carried out by supplying a secondary air flow to the interior of the filter to be cleaned, and air being able to flow through the filters separately from each other from the outside to the inside in the vacuum container in a sealed manner, and a flap element disposed in a chamber housing being pivotable, by means of the pivoting of which openings may be closed and released, the secondary air flow reaching the surface of the filter to be cleaned from the inside toward the outside in pulses, characterized in that the flap element comprises at least two partial flaps, the pivoting of which is actuated by a pivot drive, the respective partial flap optionally closes the outflow opening of the respective filter chamber in the direction of the intake opening of the suction turbine, the blow-out side of the suction turbine delivers the created overpressure air into an overpressure chamber in which a chamber housing is disposed, the at least one drive element to be suddenly actuated comprises openings to be opened and closed, upon the opening of which the overpressure air flows through the chamber housing optionally into an impulse channel which branches off at that location and introduces the air into one or into the other filter chamber for cleaning.

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Buch, Germany

Rainer Hafenrichter