Rotor element and a rotor for a screening apparatus
AssigneeAikawa Fiber Technologies Trust
InventorMathieu Hamelin
Life of this patent
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Abstract
The present invention relates to a turbulence element for use with a rotor and a rotor featuring turbulence elements. The rotor is used in a screening apparatus of the pulp and paper industry. The turbulence element has a longitudinal centerline (CL); two longitudinal edges, a leading edge and a trailing edge; two opposite ends, a first end and a second end; and two surfaces, a top surface and a bottom surface arranged between the leading edge and the trailing edge. The top surface is divided into a leading surface having its origin at the leading edge, and a trailing surface having its origin at the trailing edge. The leading edge and the leading surface are provided with undulations (U).
Claims32
A screening apparatus for screening a fiber suspension, the screening apparatus comprising:
- a screen cylinder and a rotor rotatable relative to the screen cylinder, the rotor having turbulence elements in fixed positions thereon, the turbulence elements adapted to create turbulence in the fiber suspension, facing the screen cylinder, and the turbulence elements comprising:
- a longitudinal centerline (CL);
- a length (L) in a direction of an axis of the rotor;
- two longitudinal edges, the two longitudinal edges comprising a leading edge contacting the fiber suspension and a trailing edge;
- two opposite ends, the two opposite ends comprising a first end and a second end, wherein the first end is opposite the second end;
- and
- two surfaces, the two surfaces comprising a top surface facing the screen cylinder and a bottom surface, each of the two surfaces arranged between the leading edge and the trailing edge;
- the top surface divided into a leading surface having an origin at the leading edge and a trailing surface having an origin at the trailing edge, the leading and trailing surfaces meeting at a peak-line, and the leading surface having a circumferential length between the leading edge and the peak-line and the leading surface having undulations (U), the undulations configured to contact the fiber suspension and facilitate generation of three-dimensional fluid activity in the fiber suspension to weaken and release a blockage in the screen cylinder,
- wherein each of the undulations extends at most for the entire circumferential length of the leading surface, the turbulence element is adapted to facilitate backflushing action following the leading edge, and wherein the leading surface forms an acute angle with the bottom surface of the turbulence element for the entire length (L) thereof.
Turbulence element for a screening apparatus for screening a fiber suspension, the turbulence element adapted to generate turbulence in the fiber suspension and comprising:
- a longitudinal centreline (CL);
- a length (L);
- two longitudinal edges, the two longitudinal edges comprising a first edge and a second edge;
- two opposite ends, the two opposite ends comprising a first end and a second end, wherein the first end is opposite the second end;
- and
- two surfaces, the two surfaces comprising a top surface and a bottom surface, the two surfaces arranged between the first edge and the second edge;
- the top surface divided into a first surface having an origin at the first edge, and a second surface having an origin at the second edge, the first and second surfaces meeting at a peak-line, and the first surface having a circumferential length between the first edge and the peak-line, and the first surface having undulations (U), the undulations configured to contact the fiber suspension and facilitate generation of three-dimensional fluid activity in the fiber suspension to weaken and release a blockage in a screen cylinder of the screening apparatus,
- wherein the undulations extends at most for an entire circumferential length of the first surface, the turbulence element is adapted to facilitate backflushing action of the screen cylinder following the leading edge, and wherein the first surface forms an acute angle with the bottom surface of the turbulence element for the entire length (L) thereof.
A screening apparatus for screening a fiber suspension, the screening apparatus comprising:
- a screen cylinder having apertures;
- and
- a rotor having turbulence elements in fixed positions thereon, the turbulence elements adapted to create turbulence in the fiber suspension and comprising two longitudinal edges, the two longitudinal edges comprising a leading edge and a trailing edge, wherein the leading edge comprises undulations (U), the undulations configured to contact the fiber suspension and facilitate generation of three-dimensional fluid activity in the fiber suspension to weaken and release a blockage in the screen cylinder, and
- wherein the turbulence elements are adapted to facilitate backflushing action following the leading edge.
Dependencies are inferred from the claim text.