| 摘要 |
A centrifugal separator (10, Figure 1) for separating solid particles from a liquid, eg engine lubricant, includes a rotor container (20) to which the liquid is supplied at elevated pressure and caused to escape via tangentially directed nozzles (28) to create high speed rotation of the rotor and centrifugal separation forces within the liquid. In order to avoid problems of noise and vibration when the rotor empties as it spins to rest, it is characterised by a check valve (40) incorporated between separation and outflow chambers (36, 37) of the rotor which makes use of the normally conical shape of the partition wall (35) between the chambers that defines a central, annular, transfer aperture (39). The check valve includes a body (41) disposed to overlie, be biased towards and seat against, the inclined face of the partition wall to form a low flow-resistance valve from parts cheap enough to dispose of with the rotor. Notwithstanding the ability for low cost manufacture, the check valve is able to provide a good seal that retains liquid in the separation chamber, not only reducing wind-down noise but also enabling the centrifugal separator to commence working more quickly after frequent engine stops, and on both counts is particularly suited to passenger car engines. |
