Center plate in a pulp refiner
First Claim
1. A pulp refiner comprising a rotor, a stator, a center plate for the rotor, said center plate having a first surface including a central portion and a periphery adjacent to a refining area including grinding segments on said rotor, said first surface being further provided with a plurality of wings for directing pulp flowing onto said center portion of said first surface of said center plate towards said periphery of said first surface of said center plate whereby pulp enters said refining area on said rotor and is ground by said grinding segments in said refining area, wherein each of said plurality of wings comprises an arc-shaped protrusion extending between a corresponding first point and a corresponding second point on said first surface of said center plate, said first point being displaced from said center portion of said center plate and said second point being disposed further from said center portion of said center plate than said first point, said plurality of wings having an arc shape that yields a larger pulp feeding angle than a circular arc intersecting said center portion of said center plate and ending in the same corresponding second point, and wherein said second point of each of said plurality of wings lies on said periphery of said center plate, and wherein said arc-shapes of each of said plurality of wings are defined by a circular arc extending between a corresponding first point and a corresponding second point having a chord that is longer than the chord of a circular arc beginning in said center portion of said center plate and ending in the same corresponding second point, said chord being defined as a straight line connecting the end points of said arc.
1 Assignment
0 Petitions
Accused Products
Abstract
A center plate for a rotor in a pulp refiner is described in which the center plate is provided with a plurality of first wings for directing pulp flowing onto the center portion of the center plate towards the periphery of the center plate, each of the first wings comprising an arc-shaped protrusion extending between a corresponding first point and a corresponding second point on the surface of the center plate, the first point being displaced from the center portion of the center plate and the second point being disposed further from said center portion of the center plate then the first point, the first wings having an arc shape that yields a larger pulp feeding angle then that of a circular arc intersecting the center portion of the center plate and ending in the same corresponding second point, and the second point of each of the first wings lies on the periphery of the center plate.
-
Citations
8 Claims
- 1. A pulp refiner comprising a rotor, a stator, a center plate for the rotor, said center plate having a first surface including a central portion and a periphery adjacent to a refining area including grinding segments on said rotor, said first surface being further provided with a plurality of wings for directing pulp flowing onto said center portion of said first surface of said center plate towards said periphery of said first surface of said center plate whereby pulp enters said refining area on said rotor and is ground by said grinding segments in said refining area, wherein each of said plurality of wings comprises an arc-shaped protrusion extending between a corresponding first point and a corresponding second point on said first surface of said center plate, said first point being displaced from said center portion of said center plate and said second point being disposed further from said center portion of said center plate than said first point, said plurality of wings having an arc shape that yields a larger pulp feeding angle than a circular arc intersecting said center portion of said center plate and ending in the same corresponding second point, and wherein said second point of each of said plurality of wings lies on said periphery of said center plate, and wherein said arc-shapes of each of said plurality of wings are defined by a circular arc extending between a corresponding first point and a corresponding second point having a chord that is longer than the chord of a circular arc beginning in said center portion of said center plate and ending in the same corresponding second point, said chord being defined as a straight line connecting the end points of said arc.
Specification