SHEARING PUMP

• US 3,692,422 A
• Filed: 01/18/1971
• Issued: 09/19/1972
• Est. Priority Date: 01/18/1971
• Status: Expired due to Term

• Current Assignee: Jean-Pierre Girardier
• Original Assignee: Jean-Pierre Girardier
• Inventors: Girardier, Jean-Pierre
• Primary Examiner(s): Raduazo, Henry F.
• Application Number:
  US05/107,069
• Time in Patent Office: 610 Days
• Field of Search: 415/121B,121,71,213,206,219 241/46.11,197 416/183,185,186
• US Class Current: 415/121.1
• CPC Class Codes: F04D 29/2288 for comminuting, mixing or separating
• CPC Class Codes: F04D 7/045 with means for comminuting, mixing stirring or otherwise treating
• CPC Class Codes: Y02P 80/10 Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Abstract

A rotary shearing pump for circulating liquids containing solid substances in suspension. The pump rotor comprises a hydraulic wheel and a shearing wheel which are assembled in detachable manner and each provided with curved vanes, the vanes of the shearing wheel being joined to those of the hydraulic wheel. The vanes of the shearing wheel cooperate with at least one radial blade for grinding the solid substances and preventing clogging of the pump. The vane profiles of the hydraulic wheel are designed solely in accordance with hydrodynamic conditions. The inlet edges of the shearing-wheel vanes are located on a conical surface which is coaxial with the rotor.

Claims

1. A rotary shearing pump for handling liquids with entrained solids comprising:

a stationary pump body provided with a central inlet orifice and a tangential discharge volute, a rotor of the centrifugal type which is symmetrical with respect to an axis of rotation and comprises a hydraulic wheel of the closed type having a plurality of curved vanes and a separate central shearing wheel, means detachably connecting the shearing wheel to the hydraulic wheel for replacement of the shearing wheel and for attachment of the rotor to a drive means, the shearing wheel having curved vanes, the number of vanes of the shearing wheel being the same as the number of vanes of the hydraulic wheel, and the vanes of both wheels having surfaces whose lateral generating lines are parallel to the axis of the rotor, the vanes of the shearing wheel having exposed free cutting edges that are spaced apart from the pump body, and the vanes of both wheels, when the latter are assembled, providing continuous surfaces, means for driving the rotor in rotation, at least one stationary blade disposed transversely with respect to the shearing wheel, and having a cutting edge located in the immediate vicinity of said edges of the shearing-wheel vanes, said edges of the shearing-wheel vanes being located on a conical surface whose axis if the axis of rotation of the rotor and the inner lines of intersection of the shearing-wheel vanes with the shearing wheel being tangent to the axis of rotation of the rotor substantially at the vertex of said conical surface, and an inertia flywheel within the pumP body on the hydraulic wheel.

2. A pump in accordance with claim 1, wherein the projections of the inlet edges of the shearing-wheel vanes on a plane at right angles to the rotor axis are substantially logarithmic spirals.

3. A pump in accordance with claim 2, wherein the shearing-wheel vanes have substantially helicoidal surfaces.

4. A pump in accordance with claim 1, wherein the pump body has a deflecting tongue which is disposed within the admission orifice and protects the base of the blade.

5. A pump in accordance with claim 1, wherein the pump body has a radial recess for the blade, said recess being provided with a first screw for adjusting the radial position of the blade and a second screw for lateral locking and located at right angles to the first screw.

6. A pump in accordance with claim 1, wherein the shearing wheel comprises a threaded axial portion adapted to be screwed into the hydraulic wheel, the direction of the screw-thread being opposite to the direction of rotation of the rotor and at least one tapped hole displaced off-center and intended to accommodate a threaded rod which is screwed into the hydraulic wheel.

7. A pump in accordance with claim 1, in which said blade lies in a plane that passes through said axis.