Use of a multistage propeller pump for pumping concentrated fibrous suspensions and a propeller pump specially adapted for this use.

摘要

The invention relates to the use of an at least three-stage propeller pump for pumping charged liquids, containing a large quantity of gas, especially fibrous suspensions having at least 8% by weight of fibers. BR/ Preferably each blade (11 ') of the propeller (7) which is located at least in the first stage of the pump is recessed (33) with a recess (32) in the extrados (30) . BR/ Preferably the axial shaft supporting the propellers is hollow, the blades (11) of the propeller which is located at least in the first stage are provided on their extrados (17) at least one evacuation orifice (28); in addition the pump is equipped with a gas withdrawal device which is connected to said orifice (28) via the hollow shaft. / P