Air purification apparatus, for removing dirt, dust, allergens and other particles, comprises fan rotor and rotating filter with inward air flow through filter surface, providing effective removal of fines

摘要

In an air purification apparatus in which air to be purified is sucked from a room or surface via a fan rotor (2) through a separator and another fines separator, comprising a rotating filter (3) for separating very small particles and retaining the particles for disposal, the unloaded filter is applied mainly at and before and to a lesser degree after the suction surface of the fan rotor, air is sucked inwards through the filter surface (4) and the filtered air flows axially in or from the fan rotor. In an air purification apparatus in which air to be purified is sucked from a room or surface via a fan rotor (2) through a separator (e.g. a water bath (8), filter bag or cyclone) and another fines separator, comprising a rotating filter (3) for separating very small particles (i.e. dirt, water droplets and other suspended particles) from the air and retaining the particles for disposal, the unloaded filter is applied at or before the suction surface of the fan rotor and air is sucked inwards through the filter surface (4) without deep action (i.e. a fabric or sieve network of thin fibers of plastics or metal, in the form of a cylinder, cone, truncated cone, conical section, pyramid or truncated pyramid with various base surfaces) and/or a disk perpendicular to the axis, axially with respect to the fan rotor. The particles retained on the outer filter surface are removed by centrifugal force, and do not remain partially within the filter region. The peripheral diameter of the internal filter surface is not (or only marginally) greater than the outer peripheral diameter of the axial openings (21a) in the outlet disk (21) and the channel to and the axial suction surface from the fan rotor, thus inhibiting release of particles smaller than the mesh width within the filter surface under centrifugal force. The particles are then carried by the axial air flow from the rotating filter and the channel to the fan rotor (to provide a self-cleaning effect), and not opposite to the fan rotor (which would reduce the pumping effectiveness).