Patent ID: 8747532

Claim:
A filter device for filtering dust from air, comprising: a housing defining an air inlet at a bottom of the housing and an air outlet at a top of the housing; a dust collecting module placed in the housing between the air inlet and the air outlet, the dust collecting module comprising a receiving member and a plurality of dust collecting members moveably received in the receiving member, wherein each dust collecting member comprises a connecting surface, a substantially circular first end, a substantially circular second end, and a plurality of collecting leaves, the connecting surface defines a shaft hole, the first end and the second end are respectively placed on opposite sides of the connecting surface, the plurality of collecting leaves forms two groups, each of the plurality collecting leaves of one group extends from one side of the connecting surface to the first end, and each of the plurality collecting leaves of the other group extends from the opposite side of connecting surface to the second end, and the two groups of the collecting leaves are staggeredly arranged on the opposite sides of the connecting surface, an inner diameter of the first end is greater than a diameter of the shaft hole, and an inner diameter of the second end is smaller than the diameter of the shaft hole; a spraying module installed in the housing between the dust collecting module and the air outlet; and an exhaust connected to the housing for generating air pressure difference between near the air outlet and near the air inlet, thereby drawing and introducing air containing dust from the bottom of the housing toward the top of the housing via the air inlet.