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US 11,982,053 B2Granted
Refiner plate having inter-bar wear protrusions
AssigneeAndritz Inc.
InventorsLuc Gingras, Tobias Michel
Life of this patent
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Abstract
The problem of increased energy usage in refiners over the working life of a refining assembly is mitigated by the use of a refiner plate segment having a refiner side and a back side distally disposed from the refiner side, refiner bars engaged to a substrate of the refiner side, wherein the refiner bars have a refiner bar height, and wherein adjacent refiner bars and the substrate define grooves between the adjacent bars, and protrusions disposed in the grooves, wherein the protrusions have a protrusion height, wherein the protrusion height is 30% or less of the refiner bar height.
Claims23
A refiner plate segment comprising:
- an inner arc;
- an outer arc distally disposed from the inner arc;
- a first end distally disposed from a second end, the first end and second end extending between the inner arc and the outer arc;
- a substrate disposed between the inner arc, first end, second end, and the outer arc;
- a refiner side and a backside distally disposed from the refiner side;
- refiner bars engaged to the substrate on the refiner side, wherein the refiner bars have a refiner bar height, and wherein a first pair of adjacent refiner bars and the substrate define a first groove between the adjacent refiner bars and additional pairs of adjacent refiner bars and the substrate define a plurality of second grooves;
- a plurality of protrusions disposed in the first groove, the protrusions each having a protrusion height, wherein a protrusion height is no more than 30% of the refiner bar height;
- and
- a plurality of dams disposed in each of the second grooves, wherein the dams include surface dams and subsurface dams,
- wherein a spacing between adjacent protrusions in the first groove is less than a spacing between adjacent subsurface dams in the second grooves that include subsurface dams, and
- wherein the plurality of protrusions are configured to wear at a rate substantially equal to a rate of wear of the refiner bars so as to maintain an effectively constant groove depth.
8 more elements
A refiner plate segment comprising:
- an inner arc;
- an outer arc distally disposed from the inner arc;
- a first end distally disposed from a second end, the first end and the second end extending between the inner arc and the outer arc;
- a substrate disposed between the inner arc, first end, second end, and the outer arc;
- a refiner side of the substrate and a back side of the substrate distally disposed from the refiner side;
- refiner bars engaged to the substrate on the refiner side, wherein the refiner bars have a refiner bar height, and wherein a first pair of adjacent refiner bars and the substrate define a first groove between the adjacent refiner bars and additional pairs of adjacent refiner bars and the substrate define a plurality of second grooves;
- protrusions disposed in the first groove, the protrusions each having a protrusion top, a protrusion base, and a protrusion height between the protrusion top and the protrusion base, and a side connecting the protrusion top and the protrusion base,
- wherein each protrusion of the protrusions has a longitudinal cross-sectional area measured from a plane disposed along a longest length of the protrusion as measured from a portion of the protrusion disposed closest to the inner arc to a portion of the protrusion disposed closest to the outer arc,
- wherein an adjacent refiner bar of the refiner bars has a lateral cross-sectional area measured from a plane intersecting a refining section transversely to a refiner bar length, wherein the protrusion longitudinal cross-sectional area is less than 20% of a lateral cross-sectional area of the adjacent refiner bar, and
- a plurality of dams disposed in each of the second grooves, wherein the dams include surface dams and subsurface dams,
- wherein a spacing between adjacent protrusions in the first groove is less than a spacing between adjacent subsurface dams in the second grooves that include subsurface dams, and
- wherein the protrusions are configured to wear at a rate substantially equal to a rate of wear of the refiner bars so as to maintain an effectively constant groove depth.
9 more elements
A refiner plate segment comprising:
- an inner arc;
- an outer arc distally disposed from the inner arc;
- a first end distally disposed from a second end, the first end and the second end extending between the inner arc and the outer arc;
- a substrate disposed between the inner arc, first end, second end, and the outer arc;
- a refiner side of the substrate and a backside of the substrate distally disposed from the refiner side;
- refiner bars engaged to the substrate on the refiner side, wherein the refiner bars have a refiner bar height, and wherein a first pair of adjacent refiner bars and the substrate define a first groove between the adjacent refiner bars and additional pairs of adjacent refiner bars and the substrate define a plurality of second grooves;
- a plurality of protrusions disposed in the first groove between the first pair of adjacent refiner bars,
- wherein each of the protrusions is a flow restrictor having a first restrictor end distally disposed from a second restrictor end,
- wherein the first restrictor end engages a leading face of a first refiner bar of the first pair of adjacent refiner bars, and
- wherein the flow restrictor is disposed above the substrate of the first groove;
- and
- a plurality of dams disposed in each of the second grooves, wherein the dams include surface dams and subsurface dams,
- wherein a spacing between adjacent protrusions in the first groove is less than a spacing between adjacent subsurface dams in the second grooves that include subsurface dams, and
- wherein the plurality of protrusions are configured to wear at a rate substantially equal to a rate of wear of the refiner bars so as to maintain an effectively constant groove depth.
11 more elements
Dependencies are inferred from the claim text.