Refiner disc having steam exhaust channel
First Claim
1. A rotary disc refiner for grinding a material in a liquid, at least some of which vaporizes as a result of the grinding, the refiner comprising at least two discs having spaced apart opposing surfaces, means for feeding the material into the space between the at least two discs, and means for rotating at least one disc around an axis relative to the other disc, at least one of the discs comprising:
- a refining surface comprised of a plurality of generally radial ribs forming generally radial grooves therebetween for grinding said material; and
,a channel for exhausting vapor from a first portion of the refining surface of the disc radially outwardly to a second portion of the refining surface, the channel comprisinga vapor inlet opening in the first portion of the refining surface of the discs;
a vapor outlet opening in the second portion of the refining surface;
a passageway extending behind the refining surface of the disc from the vapor inlet opening to the vapor outlet opening; and
,an upraised ridge disposed adjacent the vapor inlet opening.
1 Assignment
0 Petitions
Accused Products
Abstract
A rotary disc refiner includes a pair of spaced apart refiner discs for refining or grinding a material that typically is fibrous material such as wood pulp or the like. Pressurized vapor, typically steam, produced as a result of the refining or grinding is exhausted through a channel in the refiner disc which extends through the body of the disc. Preferably, the channel is located in a refiner disc that rotates. The channel includes a vapor inlet opening located preferably in the high pressure midsection of the refiner disc, a vapor outlet opening which discharges the steam to the relatively low pressure outer section of the disc, and a passageway behind the refining or grinding surface of the refiner disc connecting the inlet to the outlet.
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Citations
59 Claims
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1. A rotary disc refiner for grinding a material in a liquid, at least some of which vaporizes as a result of the grinding, the refiner comprising at least two discs having spaced apart opposing surfaces, means for feeding the material into the space between the at least two discs, and means for rotating at least one disc around an axis relative to the other disc, at least one of the discs comprising:
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a refining surface comprised of a plurality of generally radial ribs forming generally radial grooves therebetween for grinding said material; and
,a channel for exhausting vapor from a first portion of the refining surface of the disc radially outwardly to a second portion of the refining surface, the channel comprising a vapor inlet opening in the first portion of the refining surface of the discs; a vapor outlet opening in the second portion of the refining surface; a passageway extending behind the refining surface of the disc from the vapor inlet opening to the vapor outlet opening; and
,an upraised ridge disposed adjacent the vapor inlet opening. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A refiner for refining a fibrous material, the refiner comprising:
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at least one pair of spaced apart refining discs, each disc having a refining surface defined by a plurality of generally radial ribs forming generally radial grooves, and at least one disc being rotatable about an axis relative to the other disc for grinding the fibrous material in the space between the discs; at least one of the discs defining a body and having a steam channel therein, the channel being comprised of an inlet on the refining surface of the disc and an outlet on the refining surface of the disc, and a passageway extending behind the refining surface and through the body of the at least one of the discs from the inlet to the outlet; wherein steam produced between the pair of spaced apart refining discs as a result of the grinding of the fibrous material by the pair of spaced apart refining discs is exhausted through the passageway from a first portion to a second portion of the refining surface of the at least one of the discs. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A refiner comprising:
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a first disc rotatable about an axis; a second disc spaced apart from and opposing the first disc; each disc having a refining surface comprised of a multiplicity of generally radial ribs forming generally radial grooves for grinding a fibrous material between the discs; a steam channel in at least one of the discs for venting vapors produced as a result of the grinding from a high pressure area of the refining surface to a lower pressure area of the refining surface, a passageway of the steam channel extending behind and spaced axially from the refining surface of the at least one of the discs; and wherein the steam channel is comprised of a) an inlet opening
1) that is disposed in a midsection of the refining surface of the at least one of the discs and
2) that connects to the passageway, and b) an outlet opening
1) that is disposed in a section of the refining surface located radially outward of the inlet opening and
2) that connects to the passageway. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A refiner disc for a rotary disc refiner comprising:
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a) a body having a refining surface comprising a refining zone; and b) a channel for venting pressure buildup adjacent said refining surface comprising an inlet opening in said refining surface, an outlet opening in said refining surface that is disposed outwardly of said inlet opening, and a passageway in said body underlying said refining surface, said passageway connecting said inlet opening to said outlet opening. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. A refiner disc segment of a refiner disc for a rotary disc refiner comprising:
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a) a body having a refining surface comprising a radially outwardly refining zone; b) a channel for venting pressure buildup adjacent said refining zone comprising an inlet opening in said refining zone, an outlet opening in said refining zone that is disposed radially outwardly of said inlet opening, and a passageway in said body connecting said inlet opening to said outlet opening permitting vapor to flow from said inlet opening through said passageway and out said outlet opening; c) a ridge upraised from said refining surface with said ridge located
1) adjacent said inlet opening and
2) radially inwardly of said inlet opening; andd) wherein said passageway is defined in part by a generally axially extending radially outward wall adjacent said outlet opening that is beveled radially outwardly. - View Dependent Claims (51, 52)
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53. A method of refining with a rotary disc refiner comprising:
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a) providing a first annular refiner disc having a refining surface, an inlet opening in the refining surface, an outlet opening in the refining surface located outwardly of the inlet opening, a passageway in the first refiner disc that underlies the refining surface and connects the inlet opening to the outlet opening permitting vapor under pressure to travel through the passageway, and a second annular refiner disc having a refining surface that opposes the refining surface of the first refiner disc; b) rotating one of the refiner discs relative to the other of the refiner discs; c) introducing a fibrous material in a liquid slurry to be refined between the first and second refiner discs such that the fibrous material to be refined moves radially outwardly from adjacent a radially inward portion of the first and second refiner discs toward a radially outward portion of the first and second refiner discs; d) venting vapor from a first location between the first refiner disc and the second refiner disc through the passageway; e) exhausting the vapor between the first refiner disc and the second refiner disc at a second location disposed outwardly of the first location. - View Dependent Claims (54, 55)
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56. A refiner for refining a fibrous stock slurry comprising:
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a housing having a stock inlet; a pair of opposed refiner disc mounting surfaces disposed inside said housing with one of said refiner disc mounting surfaces rotatable relative to the other one of said refiner disc mounting surfaces about an axis of rotation; a first refiner disc removably carried by one of said mounting surfaces, said first refiner disc comprised of a plurality of pairs of refiner segments that each have a refining surface that includes a plurality of pairs of upraised bars with at least a plurality of grooves therebetween; a second refiner disc removably carried by another one of said mounting surfaces and opposing said first refiner disc, said second refiner disc comprised of plurality of pairs of refiner segments that each have a refining surface that includes of a plurality of pairs of upraised bars with at least a plurality of grooves therebetween; and at least one vapor vent in at least one of said refiner disc segments that includes a vapor inlet that accepts vapor, a vapor outlet in said refining surface that exhausts vented vapor into a gap between said first refiner disc and said second refiner disc, and a vapor passageway in said at least one of said refiner disc segments that interconnects said vapor inlet and said vapor outlet with at least a portion of said vapor passageway underlying said refining surface, said vapor passageway transporting vapor from said vapor inlet to said vapor outlet. - View Dependent Claims (57, 58, 59)
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Specification