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A suspension, such as paper pulp, having a consistency of between about 6-20% (i.e. medium consistency) is pumped without the necessity of using a vacuum system to effect gas removal. A hollow shaft having elongated slots in it, has impeller blades disposed on its exterior surface. Connected to the

A suspension, such as paper pulp, having a consistency of between about 6-20% (i.e. medium consistency) is pumped without the necessity of using a vacuum system to effect gas removal. A hollow shaft having elongated slots in it, has impeller blades disposed on its exterior surface. Connected to the suspension inlet end of the shaft is a hollow boat-type propeller which positively feeds suspension directly to the impeller blades. The propeller is disposed in a vessel having an enlarged cross-section with respect to the pump housing, and anti-rotation bars are placed around the propeller in the vessel to prevent rotation of its suspension, so that it is fed by the propeller. The propeller pressurizes any gas separated from the suspension so that it can be removed from the suspension by the pump without a vacuum system.

대표청구항 ▼

A pump comprising: a main housing including a suspension inlet and a suspension outlet generally transverse to said suspension inlet; a shaft rotatable about an axis of rotation generally in alignment with said inlet; a fluidizing impeller mounted to said shaft for rotation therewith for effecting f

A pump comprising: a main housing including a suspension inlet and a suspension outlet generally transverse to said suspension inlet; a shaft rotatable about an axis of rotation generally in alignment with said inlet; a fluidizing impeller mounted to said shaft for rotation therewith for effecting fluidization of suspension pumped by said impeller from said inlet to said outlet, said fluidizing impeller comprising impeller blades having first portions elongated in a first dimension generally parallel to said axis of rotation, and comprising second impeller blade portions extending in a dimension generally perpendicular to said first impeller blade portions; and self-feeding means including a boat-type propeller connected to said shaft for positively feeding suspension directly to said impeller blades for fluidization and without fixed or rotary blades intervening between said impeller and said self-feeding means.