| 摘要 |
A high-speed rotary filter device comprises a tubular housing (24) containing a bladed rotor (22). The rotor carries inducer blades (30) in a radial outflow configuration, driving blades (32) extending axially above the length of the rotor, and exducer blades (36), and is driven by a shaft at high speed to cause an air stream to be drawn into the housing inlet end (22) by the inducer blades and to travel axially along the housing between the driving blades (32) whilst being forced to swirl around the rotor body (34). Particles suspended in the airstream migrate centrifugally to the internal surface of the housing wall, where they are collected in circumferential grooves (100, 102, 104) and escape from the housing through passages (110, 200, 212) in the housing wall. The filtered air stream is discharged by the exducer blades (36) through the outlet end of the housing via a scroll (50). In a modification the inducer blades (130) are of axial-flow configuration, and act as a turbine wheel to drive the rotor under a gas pressure differential. In another modification the inducer blades (172) are of mixed flow configuration. A further modification involves a porous shroud (310) in the form of a helical winding of spaced turns of wire wound around the tips of the rotor driving blades (320) to minimise secondary swirl. In an alternative design to minimise secondary swirl a rotor (232) having a separator portion (23) with no driving blades is provided. The filter devices are capable of filtering out particles ranging from 2 mm diameter down to 2 microns diameter from a gas stream without clogging, and can also be used for filtering liquids. |
