| 摘要 |
The present invention relates to a screening device for fiber suspensions, comprising a housing (1) with a screening means (5) and a rotary rotor (6) provided with pulsation wings (9) located at the screening means (5), whereb y a screening zone (7) is formed along the screening means (5). The screening device comprises also inlet (2) for the fiber suspension inject, a reject chamber (12) with a reject outlet (4) for reject and an accept chamber (11) with outlet (3) for screened fiber suspension. Every pulsation wing (9) has a lower edge (24) to the reject chamber (12) and an outside (22) and an inside (23), where the outside (22) faces the screening means (5). At least one pulsation wing (9) is formed so that the pressure difference between the outside (22) and inside (23) of the pulsation wing (9) at least partially decreases at the lower portion of the pulsation wing (9) in the direction to the lower edge (24), in order to prevent reject from the reject chamber (12) to flow up in the screening zone (7).
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