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Centrifugal pump for liquids containing solid material

  • US 4,594,052 A
  • Filed: 09/20/1983
  • Issued: 06/10/1986
  • Est. Priority Date: 02/08/1982
  • Status: Expired due to Fees
First Claim
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1. A centrifugal pump for liquids containing solid material comprising a housing (7), a multi-vane impeller (1), each of the vanes (2) having an outer edge (5), an inner edge (4), and a leading edge (3), said leading edge being curved backwardly in a bottom projection, with respect to the direction of rotation of the impeller, whereby the inner edge (4) runs ahead of the outer edge during rotation, said leading edge and outer edge forming angles (β

  • , ρ

    ) which are obtuse in a meridian and a bottom projection respectively;

    said leading edge and inner edge forming an acute angle in the bottom projection, said leading edge having an outer end (10), said housing having an inner wall (8), said inner wall being provided with a shoulder (9) which forms a recess, said outer end (10) of the leading edge being positioned behind said shoulder (9) and within said recess, at least one of said shoulder and the inner wall of the housing being provided with at least one groove (11) having a cutting edge (13) which cooperates with the outer end of the leading edge of the vane for cutting said solid material.

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