Separation device

Patent metadata

Field	Value
Publication number	US-11325160-B2
Application number	US-201816641402-A
Country	US
Kind code	B2
Filing date	Aug 31, 2018
Priority date	Aug 31, 2017
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

A separation device having a housing (10) with a feed conduit (1) and a reject conduit (2), between which conduits (1, 2) and an accept conduit (3) of the housing (10) is a rotor unit (13) having a shaft (4) transverse to the through-flow direction of the separation device, which shaft rotates discs (5) attached to the shaft (4), the outer surface and/or side surfaces of which discs are jagged, i.e. they have protrusions (6) and/or notches and/or these surfaces are substantially rough and the teeth (9) of at least two sieves (7, 8) attached to the housing (10), extend between the discs (5), the first sieve (7) being between the reject conduit (2) and the accept conduit (3) and the second sieve (8) being between the feed conduit (1) and the accept conduit (3).

First claim

The invention claimed is:

1. A separation device for separating oversized pieces from a liquid and solids containing suspension, the separation device comprising:
a housing with a feed conduit, a reject conduit, and an accept conduit;
a rotor unit in the housing, wherein the rotor unit includes a shaft transverse with respect to a through-flow direction of the liquid and solids containing suspension flowing through the separation unit,
wherein the shaft rotates discs attached to the shaft, and an outer surface and/or side surface of each of the discs has protrusions, humps and/or notches, and
the teeth of at least two sieves attached to the housing extend between the discs, wherein the at least two sieves include a first sieve between the reject conduit and the accept conduit, and a second sieve between the feed conduit and the accept conduit;
wherein the feed conduit and the accept conduit are aligned such that a straight line perpendicular to a rotational axis of the shaft extends through the feed and accept conduits.

2. The separation device according to claim 1 , wherein the outer surfaces of each of the discs have the protrusions, and each of the protrusions have a front surface with a slope less than a slope of a trailing edge of the protrusion.

3. The separation device according to claim 1 , wherein the discs are attached to the shaft and/or to each other by planar support members and/or rod support members parallel to the shaft.

4. The separation device according to claim 1 , further comprising separating slots between the rotor unit and the first and second sieves, and widths of each of the separating slots are within twenty percent of the widths of the other separating slots.

5. The separation device according to claim 1 , wherein a distance between the teeth of the first sieve differs from a distance between the teeth of the second sieve.

6. The separation device according to claim 1 , wherein at least one of the first and second sieves is attached to the housing by a hinge or a slide.

7. The separation device according to claim 5 , wherein the attachment to the housing of at least one of the first and second sieves is movable in response to an impact of a reject piece.

8. The separation device according to claim 1 , wherein the second sieve is closer to the accept conduit than to the feed conduit.

9. The separation device according to claim 1 , wherein the second sieve is closer to the feed conduit than to the rejects conduit.

10. The separation device according to claim 1 , wherein a front surface of at least some of the protrusions of at least some of the discs has a convex shape.

11. The separation device according to claim 1 , wherein a distance from a center of the shaft to a first of the humps of the discs differs from a distance from the center of the shaft to another of the humps.

12. The separation device according to claim 1 , wherein at least some of the teeth of the sieves taper towards an apex and/or a front surface of the respective one of the teeth.

13. The separation device according to claim 1 , wherein at least some of the protrusions on the discs of the rotor unit are oriented in a rotational direction.

14. The separation device according to claim 1 , further comprising at least one sensor configured to sense magnetism, ultrasound, acceleration, acoustic emissions and/or pressure measurements and the at least one sensor is attached to at least one of the reject conduit, to the sieves and/or to the housing.

15. A separation device comprising:
a housing defining an inner chamber and a feed conduit, a reject conduit and an accept conduit each defining a passage to the inner chamber;
discs in the inner chamber and mounted to a shaft, wherein the discs are configured to be rotated by the shaft about an axis transverse to a flow direction of a liquid and solids suspension which enters the feed conduit, flows through the inner chamber and exits the accept conduit;
the discs each have protrusions extending radially outward;
a first sieve attached to the housing and extending into the inner chamber, wherein teeth on the first sieve interlace with the protrusions of the discs, wherein the first sieve is positioned such that as the protrusions pass through the teeth of the first sieve as the discs rotate away from the accept conduit and towards the feed conduit; and
a second sieve attached to the housing and extending into the inner chamber, wherein teeth on the second sieve interlace with the protrusions of the discs, wherein the second sieve is positioned such that as the protrusions pass through the teeth of the second sieve as the discs rotate away from the reject conduit and towards the accept conduit,
wherein the feed conduit and the accept conduit are aligned such that a straight line perpendicular to a rotational axis of the shaft extends through the feed and accept conduits.

16. The separation device according to claim 15 , wherein the protrusions have a trailing surface sloped at a greater angle than a slope of a front surface of the protrusions.

17. The separation device according to claim 15 , a distance between the teeth of the first sieve differs from a distance between the teeth of the second sieve.

18. The separation device according to claim 15 , at least one of the first and second sieves is attached to the housing by a hinge or a slide.

19. The separation device according to claim 15 , wherein the protrusions have outer surfaces that are jagged.

20. The separation device according to claim 15 , wherein the protrusions on each disc are arranged in an annular array around the disc.

21. The separation device according to claim 15 , wherein the protrusions on one of the discs is offset from the protrusions on another of the discs along a direction parallel to the axis.

22. The separation device according to claim 15 , wherein the protrusions include at least one of humps and notches.

Assignees

• Andritz Oy

Inventors

• Peltonen Kari
• Vehmaa Janne
• Kaipainen Vesa
• Siik Sami
• Porkka Sampsa

Classifications

• B01D29/64

  by scrapers, brushes, {nozzles}, or the like, acting on the cake side of the filtering element · CPC title

• D21D5/00

  Purification of the pulp suspension by mechanical means; Apparatus therefor (centrifuges, cyclones B04) · CPC title

• B07B13/003 Primary

  Separation of articles by differences in their geometrical form or by difference in their physical properties, e.g. elasticity, compressibility, hardness · CPC title

• B07B2230/01

  Wet separation · CPC title

• D21D5/06

  Rotary screen-drums · CPC title