FEEDING CENTER PLATE IN A PULP OR FIBER REFINER

• US 20180236455A1
• Filed: 10/05/2016
• Published: 08/23/2018
• Est. Priority Date: 10/08/2015
• Status: Active Grant

• Current Assignee: Valmet AB
• Original Assignee: Valmet AB
• Inventors: Lindblom, Thommy
• Granted Patent: US 10,888,868 B2
• Time in Patent Office: Days
• CPC Class Codes: B02C 7/06 with horizontal axis B02C7/04 takes precedence
• CPC Class Codes: B02C 7/12 Shape or construction of discs
• CPC Class Codes: B02C 7/14 Adjusting, applying pressure to, or controlling distance between, discs
• CPC Class Codes: D21B 1/14 Disintegrating in mills
• CPC Class Codes: D21D 1/30 Disc mills
• CPC Class Codes: D21D 1/306 Discs

Abstract

A center plate for a rotor in a pulp refiner has a surface provided with at least one feeding wing for directing lignocellulose-containing material towards a periphery. The feeding wing is an elongated protrusion arranged such that its second end is arranged further away from a center of the center plate than a first end and also is displaced relative to the first end in a direction opposite to a direction of rotation of the rotor. The center plate is also provided with at least one counter-feeding wing for directing steam flowing along the surface towards the center of the center plate. The counter-feeding wing is an elongated protrusion arranged such that a second end of the counter-feeding wing is arranged further away from the center of the center plate than a first end and closer to the center of the center plate than the first end.

Claims

1. A center plate for a rotor in a pulp or fiber refiner, said center plate having a surface provided with at least one feeding wing for directing lignocellulose-containing material flowing onto said surface towards a periphery of the center plate, wherein

said at least one feeding wing is an elongated protrusion extending between a first end and a second end, said second end of said at least one feeding wing being arranged further away from a center of the center plate than said first end of said at least one feeding wing, and said second end of said at least one feeding wing being displaced relative to said first end of said at least one feeding wing in a direction opposite to a direction of rotation of the rotor and the center plate, wherein

said surface is provided with at least one counter-feeding wing for directing a steam flowing along said surface towards the center of the center plate,

wherein said at least one counter-feeding wing is an elongated protrusion extending between a first end and a second end, said second end of said at least one counter-feeding wing being arranged further away from the center of the center plate than said first end of said at least one counter-feeding wing and closer to the center of the center plate than said first end of said at least one feeding wing, and said second end of said at least one counter-feeding wing being displaced relative to said first end of said at least one counter-feeding wing in a same direction as the direction of rotation, for directing steam to flow along said at least one counter-feeding wing in a direction having a component directed towards the center of the center plate, when the center plate is rotating in the direction of rotation.

2. A center plate according to claim 1, wherein said surface is provided with a wall arranged between said second end of said at least one counter-feeding wing and said first end of said at least one feeding wing, for preventing lignocellulose-containing material from reaching said at least one counter-feeding wing.

3. A center plate according to claim 2, wherein said wall is circular with its center coinciding with the center of the center plate.

4. A center plate according to claim 2, wherein said wall is provided with at least one opening allowing steam to flow through said at least one opening.

5. A center plate according to claim 4, wherein said at least one opening is arranged adjacent to a trailing edge of said at least one feeding wing, said trailing edge being directed in a direction opposite to a direction of rotation of the rotor and the center plate.

6. A center plate according to claim 1, wherein said at least one feeding wing is curving in a direction opposite to the direction of rotation.

7. A center plate according to claim 1, wherein said at least one feeding wing is straight.

8. A center plate according to claim 1, wherein said at least one counter-feeding wing is curving in a same direction as the direction of rotation.

9. A center plate according to claim 1, wherein said at least one counter-feeding wing is straight.

10. A center plate according to claim 1, wherein said second end of said at least one feeding wing is arranged at the periphery of the center plate.

11. A center plate according to claim 1, wherein said first end of said at least one counter-feeding wing is displaced from the center of the center plate.

12. A center plate according to claim 1, wherein said first end of said at least one counter-feeding wing is displaced from the center of the center plate at a distance larger than a radius of an end of a center axis of a hollow feed screw, said end being located adjacent to said surface of said center plate.

13. A center plate according to claim 11, wherein said surface is provided with a rotationally symmetric protuberance with its center coinciding with the center of the center plate.

14. A center plate according to claim 13, wherein said first end of said at least one counter-feeding wing is displaced from the center of the center plate at a distance larger than a radius of said protuberance.

15. A center plate according to claim 14, wherein said first end of said at least one counter-feeding wing is displaced from the center of the center plate at a distance larger than a largest radius of said protuberance.

16. A center plate according to claim 1, wherein said surface is provided with a plurality of feeding wings.

17. A center plate according to claim 16, wherein the first ends of the plurality of feeding wings are symmetrically distributed with respect to the center of the center plate.

18. A center plate according to claim 16, wherein the second ends of the plurality of feeding wings are symmetrically distributed with respect to the center of the center plate.

19. A center plate according to claim 1, wherein said surface is provided with a plurality of counter-feeding wing.

20. A center plate according to claim 19, wherein the first ends of the plurality of counter-feeding wings are symmetrically distributed with respect to the center of the center plate.

21. A center plate according to claim 19, wherein the second ends of the plurality of counter-feeding wings are symmetrically distributed with respect to the center of the center plate.

22. A pulp or fiber refiner with a rotor comprising a center plate according to claim 1.