An air filter module adapted to be used with a projection module and disposed to cover an air vent of the projection module. The air filter module includes a filter component and a cleaning unit. The cleaning unit is disposed to cover the air vent and configured to drive the filter component to have a movement so as to remove the dust on the filter component according to a cleaning-start signal. A projection device adopting the air filter module is also provided.

A filtering device and a tableware washing apparatus, the filtering device includes a rotary filter and a drive assembly. The rotary filter includes a columnar filtering screen configured to filter water from a washing process of the tableware washing apparatus; wherein a diameter of an external circle defined by each mesh of the columnar filtering screen is between 0.2 to 0.5 mm. The drive assembly is connected to the rotary filter and configured to drive the columnar filtering screen to rotate relative to contents within the columnar filtering screen at a relative speed of 100 to 1000 r/min, for separating at least a portion of residue on the columnar filtering screen from the columnar filtering screen.

A filtering device and a tableware washing apparatus, the filtering device includes a rotary filter and a drive assembly. The rotary filter includes a columnar filtering screen configured to filter water from a washing process of the tableware washing apparatus; wherein a diameter of an external circle defined by each mesh of the columnar filtering screen is between 0.2 to 0.5 mm. The drive assembly is connected to the rotary filter and configured to drive the columnar filtering screen to rotate relative to contents within the columnar filtering screen at a relative speed of 100 to 1000 r/min, for separating at least a portion of residue on the columnar filtering screen from the columnar filtering screen.