| 摘要 |
The material is impelled within an annular peripheral channel (20) or adjacent channels of a rotor (10) which rotates within the surrounding cylindrical surface (14) of a station (12), to impel the material between a stator inlet (28) and circumferentially spaced outlet (29), against a stationary blocking member (19) which extends into each channel (20) to build up pressure in the liquid which causes it to flow through the outlet (29). Seals to militate against leakage from the channels are provided between rotor and stator surfaces between which there is a narrow clearance (50), the seals comprising oblique channels (26) formed in one of the surfaces, and acting, during rotation between the surfaces, to force the liquid back along the oblique channels (26) into the impelling channel. The leakage pressure, and penetration, along the channels (26) increases between the inlet (28) and the outlet (29). Power loss in driving the rotor is reduced, by a scraper (31) which removes liquid from the bends (27) between the channels (26), at a location of maximum penetration beyond the outlet (29) and of low pressure adjacent the inlet (28). <IMAGE> |
