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1. (EP0166760) POMPE POUR MATERIAUX SOLIDES.
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique
Claims

1. A rotary pump for pumping liquids and solid materials carried in suspension therein, said rotary pump comprising an impeller, having an axis of rotation housing means comprising a swirl chamber, an impeller chamber for receiving said impeller, means for mounting said impeller within said impeller chamber for rotation in a given direction, means for introducing the liquid and solid materials into said swirl chamber, and means for discharging the liquid and solid materials from said swirl chamber, said impeller comprising a surface exposed to said swirl chamber and disposed substantially outside said swirl chamber, and a plurality of pockets disposed in said exposed surface and recessed with respect to said swirl chamber, each of said recessed pockets comprising a blade surface intersecting said exposed surface to form an intersection line, characterized in that said blade surface includes a curved surface disposed adjacent said intersection line and disposed in a convex configuration, said intersection line leading said blade surface when considering said given rotational direction, whereby upon rotation of said impeller the liquid and suspended solid materials are formed into a swirling vortex of increased rotational velocity to substantially pre- ventthe solid materials from striking said impeller.
  2. The rotary pump as claimed in claim 1, wherein said curved surface is formed by a radius rotated about a fixed point.
  3. The rotary pump as claimed in claim 2, wherein said radius is optimally 6.67 cm (2 5/8 inches).
  4. The rotary pump as claimed in claim 1, wherein the exposed surface is substantially planar.
  5. The rotary pump as claimed in claim 4, wherein a line disposed tangential to said curved surface at said intersection line forms an angle with respect to said exposed surface, said angle being substantially equal to 24°.
  6. The rotary pump as claimed in claim 5, wherein said blade surface extends to a point of maximum depth with respect to said exposed surface and intersects a plane substantially parallel with respect to said exposed surface at a second angle, said second angle being substantially equal to 30°.
  7. The rotary pump as claimed in claim 4, wherein said impeller comprises a peripheral member of substantially cylindrical configuration and enclosing each of said recessed pockets.
  8. The rotary pump as claimed in claim 7, wherein said peripheral member provides each of said recessed pockets with a second surface of substantially cylindrical configuration and disposed substantially perpendicular with respect to said exposed surface.
  9. The rotary pump as claimed in claim 8, wherein each of said recessed pockets comprises a third surface intersecting said exposed surface to form a second intersecting line and disposed substantially perpendicular with respect to said exposed surface, said second intersection line being disposed substantially tangential with respect to a circle having its center coincident with said axis of rotation.
  10. The rotary pump as claimed in claim 9, wherein said first-mentioned intersection line is aligned radially to intersect said axis of rotation.