Screening apparatus, rotor, wing package and method for manufacture

Patent metadata

Field	Value
Publication number	US-9410286-B2
Application number	US-201314647654-A
Country	US
Kind code	B2
Filing date	Nov 27, 2013
Priority date	Nov 28, 2012
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

Screening apparatus for screening pulp suspensions are provided. The screening apparatus includes a casing, a cylindrical screen member is arranged on the casing for dividing the pulp into accept and reject portions, an inlet for the pulp, an outlet for the accept, an outlet for the reject, a rotor with a rotor body, and at least one pulsator located on the inside of the screen, so that a screening chamber is formed between the rotor and the screen. The rotor is provided with a detachable pulsator package including at least one attachment ring attached to the rotor body, at least one support ring attached to or supported by the rotor body and the at least one pulsator attached to the at least one attachment ring and the at least one support ring.

First claim

The invention claimed is:

1. A screening apparatus for screening a pulp suspension comprising a casing, a screening member disposed within said casing, a rotor disposed for rotation relative to said screening member, whereby a screening chamber is formed between said rotor and said screening member, a pulp inlet for providing said pulp to said rotor, an accept outlet for accepting pump passing through said screening member, and a reject outlet for rejected pulp not passing through said screening member, said rotor including a rotor body and a detachable pulsation package comprising at least one attachment ring attached to said rotor body, at least one support ring attached to or supported by said rotor body, and at least one pulsation member attached to said at least one attachment ring and said at least one support ring.

2. The screening apparatus of claim 1 , wherein said screening member is cylindrical.

3. The screening apparatus of claim 1 , wherein said rotor body includes a pair of end surfaces and said attachment ring is attached to one of said end surfaces of said rotor body.

4. The screening apparatus of claim 3 , wherein said at least one attachment ring has a circular profile including an inner portion and an outer portion, and wherein said inner portion of said at least one attachment ring is attached to said rotor body.

5. The screening apparatus of claim 1 , wherein said at least one pulsation member includes a first end and a second end, wherein said first end of said at least one pulsation member is attached to said at least one attachment ring and said second end of said at least one pulsation member is attached to said at least one support ring.

6. The screening apparatus of claim 5 , wherein one of said first and second ends of said at least one pulsation member extends a distance of less than about 200 mm outside of said attachment of said at lease on pulsation member to said at least one attachment ring or said at least one support ring.

7. The screening apparatus of claim 1 , including at least two pulsation members, and wherein said at least one attachment ring includes an outer periphery including cut-out portions between the attachments of said at least two pulsation members to said at least one attachment ring, in order to improve the pulp flow therein.

8. The screening apparatus of claim 1 , wherein said at least one support ring includes an outer periphery including cut-out portions between the attachment of said at least two pulsation members to said at least one support ring, in order to improve the pulp flow therein.

9. The screening apparatus of claim 1 wherein said at least one pulsation member comprises a bent plate.

10. The screening apparatus of claim 1 , wherein said at least one pulsation member comprises a cast profile.

11. The screening apparatus of claim 1 , including a dilution water outlet proximate to said rotor body, said rotor body also including a wear ring proximate to said dilution water outlet.

12. A rotor for use in a screening apparatus for screening pulp suspensions, said screening apparatus comprising a casing, a screening member disposed within said casing, a rotor disposed for rotation relative to said screening member, whereby a screening chamber is formed between said rotor and said screening member, a pulp inlet for providing said pulp to said rotor, an accept outlet for accepting pulp passing through said screening member, and a reject outlet for rejected pulp not passing through said screening member, said rotor including a detachable pulsation package containing at least one attachment ring attached to said rotor body, at least one support ring attached to or supported by said rotor body, and at least one pulsation member attached to said at least one attachment ring and said at least one support ring.

13. A rotor according to claim 12 , wherein said rotor body includes a pair of end surfaces and said at least one attachment ring is attached to one of said end surfaces of said rotor body.

14. A pulsation member package for a screening apparatus for screening pulp suspensions, said screening apparatus comprising a casing, a screening member disposed within said casing, a rotor disposed for rotation relative to said screening member, whereby a screening chamber is formed between said rotor and said screening member, a pulp inlet for providing said pulp to said rotor, an accept outlet for accepting pulp passing through said screening member, a reject outlet for rejected pulp not passing through said screening member, and a detachable pulsation member package arranged for attachment to said rotor body, said detachable pulsation member package comprising at least one attachment ring attached to said rotor body, at least one support ring attached to or supported by said rotor body, and at least one pulsation member attached to said at least one attachment ring and said at least one support ring.

15. The pulsation member package of claim 14 , wherein said rotor body includes an end surface, and said at least one attachment ring is arranged to be attached to said end surface of said rotor body.

16. A method for the manufacture of a rotor for screening apparatus comprising providing at least one attachment ring, at least one support ring, and at least one pulsation member; providing a rotor body having an end surface; aligning said at least one attachment ring and said at least one support ring along said rotor body; attaching said at least one pulsation member to said at least one attachment ring and to said at least one support ring; and attaching said at least one attachment ring to said rotor body and attaching or supporting said at least one support ring to said rotor body.

17. The method of claim 16 including attaching said at least one pulsation member to said t least one attachment ring and said at least one support ring on said end surface of said rotor body.

18. A method for the manufacture of a pulsation member package for screening apparatus comprising providing at least one attachment ring, at least one support ring, and at least one pulsation member, whereby said at least one attachment ring is arranged to be attached to a rotor body; providing a fixture; aligning said at least one attachment ring and said at least one support ring along said fixture; and attaching said at least one pulsation member to said at least one attachment ring and said at least one support ring to said fixture.

Assignees

• Valmet Oy
• Valnet AB

Inventors

• Bergdahl Anders
• Lindkvist David

Classifications

• D21D5/026 Primary

  with rotating cleaning foils · CPC title

• D21F1/0027 Primary

  Screen-cloths · CPC title

• Y10T29/49828

  Progressively advancing of work assembly station or assembled portion of work · CPC title