US 12,295,539 B2
Filter device for a vacuum cleaner and filter dedusting method
Oliver Ohlendorf, Landsberg (DE)
Assigned to Hilti Aktiengesellschaft, Schaan (LI)
Appl. No. 18/024,214
Filed by Hilti Aktiengesellschaft, Schaan (LI)
PCT Filed Sep. 9, 2021, PCT No. PCT/EP2021/074767
§ 371(c)(1), (2) Date Mar. 1, 2023,
PCT Pub. No. WO2022/063586, PCT Pub. Date Mar. 31, 2022.
Claims priority of application No. 20197764 (EP), filed on Sep. 23, 2020.
Prior Publication US 2023/0284853 A1, Sep. 14, 2023
Int. Cl. A47L 9/20 (2006.01); A47L 9/00 (2006.01); B01D 46/42 (2006.01); B01D 46/58 (2022.01); A47L 5/36 (2006.01); A47L 9/12 (2006.01)
CPC A47L 9/20 (2013.01) [A47L 9/0072 (2013.01); B01D 46/4272 (2013.01); A47L 5/365 (2013.01); A47L 9/122 (2013.01); B01D 46/58 (2022.01); B01D 2279/55 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A filter device for a vacuum cleaner having a turbine device and a motor for generating a first main air stream or a second main air stream in the vacuum cleaner, the filter device comprising:
a first chamber and a second chamber, each having a filter element, a ventilation opening and a turbine opening, wherein, during suction operation through at least one of the first and second chambers, the turbine opening of the respective first or second chamber is open such that a flow connection exists between the respective first or second chamber and the turbine device, and the ventilation opening is closed such that a negative pressure prevails in the respective first or second chamber, a dedusting process of a filter element being initiated by actuation of a valve so that a pressure equalizing stream bringing about a change in pressure passes into the respective first or second chamber, wherein, as a result of the change in pressure, an elastic membrane is elastically stretched to close the turbine opening and a apply a dedusting pulse to the filter element.