초록 ▼

A centrifugal pump for pumping suspensions having a consistency of about 6-20% (for example, for pumping paper pulp) has a second stage for increasing head. An auxiliary impeller is connected to the drive shaft in front of the main impeller, and upon rotation of the drive shaft directs the suspensio

A centrifugal pump for pumping suspensions having a consistency of about 6-20% (for example, for pumping paper pulp) has a second stage for increasing head. An auxiliary impeller is connected to the drive shaft in front of the main impeller, and upon rotation of the drive shaft directs the suspension being pumped axially into association with the main impeller. Mounted between the pump inlet and the auxiliary impeller are a plurality of stationary guide vanes, and mounted on the opposite side of the guide vanes from the auxiliary impeller are a plurality of prefluidizing vanes which are also connected to the drive shaft. The stationary guide vanes remove extreme prerotation of the suspension ahead of the auxiliary impeller, and change the turbulent and chaotic condition of the suspension into a directional flow at a definite angle of entrance. Utilizing the pump of the invention, there is no need to provide a vacuum system in order for the pump to operate properly.

대표청구항 ▼

A method of pumping a suspension having a consistency between about 6-20%, comprising the step of continuously acting upon a suspension to progressively (a) effect initial fluidization of the suspension; (b) effect removal of extreme pre-rotation of the fluidized suspension, and define a definite di

A method of pumping a suspension having a consistency between about 6-20%, comprising the step of continuously acting upon a suspension to progressively (a) effect initial fluidization of the suspension; (b) effect removal of extreme pre-rotation of the fluidized suspension, and define a definite directional flow angle of the suspension; (c) effect a first fluidizing pumping of the suspension, in a first stage, to pump the suspension directly to a second stage; and (d) effect a second fluidizing centrifugal pumping of the suspension in the second stage. A centrifugal pump for fluent material comprising: a housing having an inlet and an outlet; a shaft mounted for rotation within said housing about an axis of rotation; a first set of vanes mounted to said shaft within said housing adjacent said inlet; a second set of vanes mounted to said shaft within said housing between said first set of vanes and said outlet; a third set of vanes stationarily mounted to said housing between said inlet and said first set of vanes, said third set of vanes comprising means for removing extreme prerotation of fluent material passing therethrough; and means for effecting rotation of said shaft and said first and second sets of vanes with respect to said housing.