| 摘要 |
A multistage air-particle separator comprises at least two separation stages in (18, fig 1) 114 which particle-laden air is drawn through a succession of chambers in turn by suction applied to the last of the chambers. Heavier than air particles are separated from the airstream in each chamber by centrifugal force, and conveyed to a collecting bin (26 or 66, fig 1) and particle depleted air is drawn from each chamber by suction. An intermediate separation stage comprises a cylindrical chamber, having a port (48, fig 10) through which air from an earlier stage enters the chamber. The port is arranged so that air entering the chamber does so generally tangentially, and a hollow spindle 90 extends centrally of the chamber and communicates with an opening in a closed end wall of the chamber, leading to the next separation chamber. A turbine 94, 96 is mounted for rotation about the chamber axis and is generally aligned with the port through which air enters the chamber, the incoming air causing the turbine to rotate. At least one opening 62 is provided at or near the end of the hollow spindle through which air can leave the chamber to pass therealong into the next separation stage, and a particle collecting bin (66, fig 1) is provided at the end of the chamber remote from the turbine. The hollow spindle may be stationary and the turbine rotates therearound, or the turbine is attached to the spindle so that the two rotate together. Small openings may be provided in the spindle wall around one end thereof, in which event the turbine is mounted at a position axially distant from the openings. The turbine containing region of the chamber may be separated from the region of the chamber which communicates with the interior of the hollow spindle, by means of an annular baffle 88 containing at least one opening therein through which air can pass from the one region to the other. The rotating spindle imparts rotation to the air passing into the next chamber. In this last chamber the air enters axially and is deflected on entry. A first exit port 118 removes clean air to the suction source 10. A second port 112 may be provided in the wall of the chamber circumferentially spaced from the first port, to allow particles separated in the final stage to be returned via a passage for separation in the rotating airstream in the intermediate chamber. Collecting bin (26, fig 1) is separated from the cyclone chamber (18, fig 1) by a baffle (56, fig 1) to prevent the re-entrainment of particles. Collecting bin (66, fig 1) may be replace by a valve (see fig 4) which is constructed such that downstream suction forces maintain it in a closed position during operation of the unit, but allows the valve to open when no suction is present. On openiong of the valve the collected particles are able to fall into the collecting bin (26, fig 1).
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