US Patent 11457787 Filter cleaning

A filter device for a vacuum cleaner, including a turbine device, for generating at least one first and one second main air flow through at least a portion of the vacuum cleaner, and a control unit. The filter device includes a first chamber including a first filter element, a first outflow opening, a first inlet opening and a first pressure surge element, which divides the first chamber into a first and a second space and is reversibly movable between a first and a second position, the first main air flow being able to flow into the first space of the first chamber through the first filter element and to flow back out through the first outflow opening, a second chamber including a second filter element, a second outflow opening, a second inlet opening and a second pressure surge element, which divides the second chamber into a first and a second space and is reversibly movable between a first and a second position, the second main air flow being able to flow into the first space of the second chamber through the second filter element and to flow back out through the second outflow opening. The first pressure surge element and the second pressure surge element alternately are reversibly movable to alternately clean the first and second filters.