Refining machine

• US 3,902,673 A
• Filed: 11/02/1973
• Issued: 09/02/1975
• Est. Priority Date: 11/07/1972
• Status: Expired due to Term

• Current Assignee: Torsten Lennart Berggren
• Original Assignee: Torsten Lennart Berggren
• Inventors: Berggren, Torsten Lennart
• Primary Examiner(s): Custer, Jr., Granville Y.
• Assistant Examiner(s): Goldberg, Howard N.
• Application Number:
  US05/412,464
• Time in Patent Office: 669 Days
• Field of Search: 241/162,245,246,248,251,257R,261.2,188A,275
• US Class Current: 241/246
• CPC Class Codes: B02C 7/08 with vertical axis B02C7/04 takes precedence

Abstract

A refining machine for fragmented beating material comprises a rotationally symmetric, annular infeed channel for the beating material, the infeed channel being formed between a central body and an outer part surrounding the central body. The annular infeed channel has a gradually increasing inner and outer diameter in the feed direction of the beating material, and the central body and outer part are rotatably mounted relative to each other, each supporting its own annular part of a beating means which is arranged to be passed by the beating material after being fed through the infeed channel. The infeed channel redirects the movement of the beating material essentially radially outwardly in relation to the center of rotation of the beating means.

Claims

1. A refining machine for fragmented beating material such as wood chippings, shavings and the like as well as for paper pulp in higher, non-pumpable concentrations, comprising:

a central body;

an outer part surrounding said central body, said central body and said outer part being rotatable in relation to each other about an axis of rotation, said central body and said outer part being spaced from each other so that a rotationally symmetric, annular infeed channel is formed between said central body and said outer part, said infeed channel feeding beating material over at least a portion thereof generally in the direction of said axis of rotation and having, in the feed direction of said feeding material, gradually increasing inner and outer diameters, respectively;

beating means including first and second annular parts which are respectively supported on said central body and said outer part, said beating means being arranged to be passed by the beating material after said beating material is passed through said infeed channel;

the improvement wherein;

said infeed channel is shaped to redirect movement of said beating material from a generally axial movement to a movement essentially radially outwards in relation to the axis of rotation of said beating means;

the generatrices to the two opposing limiting surfaces of said infeed channel have a uniform continuous curvature along their entire length, and further have a successively decreasing inclination out toward said beating means, said inclination being in relation to said beating means;

said limiting surfaces of said infeed channel are shaped such that the total flow area of said infeed channel increases continuously in a direction out towards said beating means;

the limiting surfaces of said infeed channel stagelessly pass outwardly into said beating means;

means is provided to divide said infeed channel into a plurality of generally spiral-shaped flow channels, said dividing means including spiral-shaped vanes mounted on one of said limiting surfaces of said infeed channel which is arranged to rotate, said spiral-shaped vanes protruding into said infeed channel and extending substantially up to the opposite limiting surface, thereby dividing said infeed channel into said spiralshaped flow channels; and

said beating means has a coarse and a fine beating zone and wherein each of said vanes is terminated with a tongue protruding into said coarse beating zone.

2. A refining machine according to claim 1 wherein said opposing surfaces of said infeed channel converge in the direction out towards said beating means.

3. A refining machine according to claim 1 wherein said central body is rotatable about said axis of rotation and said outer part surrounding said central body is stationary.

4. A refining machine according to claim 3 wherein said opposing surfaces of said infeed channel converge in the direction out towards said beating means.