Patent ID: 8161598
Filing Date: 2012-04-24
Classification: A47L,B01D,E01H

Abstract:
1. A filter device for filtering out impurities contained in a stream of gas flowing through the filter device, the filter device comprising: an inner filter plate; an outer frame that houses said filter plate therewithin; a structure for retaining and supporting said filter plate, and for conveying shaking motion thereto, said structure being arranged on a face of said filter plate; a device for shaking and vibrating said structure, the device including a control device for controlling a power supply of said electric motor in an ON-OFF cycling pattern, wherein said control device controls the power supply to said electric motor to be a direct-current supply voltage switched in an ON-OFF mode supplied in the form of a substantially square-wave voltage in a sequence comprising a pre-determined number of ON-OFF cycles.