Intermeshing screw-type refiner
First Claim
1. Apparatus of the type used for treating cellulose pulp, comprising two intermeshing rotary screws driven synchronously within a housing having lateral and end walls and having a material inlet and a material outlet in the range of respectively an inlet and an outlet end of the housing, each screw on a cylindrical core carrying a surface section constituting a treating screw thread, said screw thread comprising a feeding screw thread section starting near said inlet and having a terminal end spaced from said housing outlet end, said cylindrical core further carrying a feed-reversing surface section starting near the terminal end of said feeding screw thread section and having a terminal end near said housing outlet end, said material outlet being provided in the lateral wall of said housing adjacent the terminal end of the feeding screw thread sections of both screws for discharge of treated material substantially at right angles in relation to a plane through the axes of said screws, an outwardly flaring collar outwardly extending from said lateral housing wall around said material outlet, said collar having an outlet opening extending in a plane oblique to the direction of material discharge, means being provided outwardly of said collar selectively to restrict the outlet area of said collar outlet opening, said restricting means comprising a closure element moveable between a position in which said oblique collar outlet opening is substantially closed and opening positions in which said oblique collar outlet opening is selectively uncovered, adjustable means being provided controlling the movement of said closure element to selectively establish the resistance offered by said restricting means against discharge of material through said outlet.
1 Assignment
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Accused Products
Abstract
In a refiner for treating cellulose pulp or similar material of the type comprising two intermeshing rotary screws operating in a housing having a material inlet and a material outlet, the surface of each screw comprises a feeding thread section merging into a feed-resisting surface section, the outlet being provided in a side-wall of the housing near the zone where the feeding thread sections on both screws end and the feed-reversing surface sections begin. The outlet opens into an outwardly flaring collar having a plane mouth opening oblique in relation to the direction of material discharge through the material outlet. The mouth opening cooperates with a closure element to restrict the outlet area to control working pressure conditions within the housing.
22 Citations
19 Claims
- 1. Apparatus of the type used for treating cellulose pulp, comprising two intermeshing rotary screws driven synchronously within a housing having lateral and end walls and having a material inlet and a material outlet in the range of respectively an inlet and an outlet end of the housing, each screw on a cylindrical core carrying a surface section constituting a treating screw thread, said screw thread comprising a feeding screw thread section starting near said inlet and having a terminal end spaced from said housing outlet end, said cylindrical core further carrying a feed-reversing surface section starting near the terminal end of said feeding screw thread section and having a terminal end near said housing outlet end, said material outlet being provided in the lateral wall of said housing adjacent the terminal end of the feeding screw thread sections of both screws for discharge of treated material substantially at right angles in relation to a plane through the axes of said screws, an outwardly flaring collar outwardly extending from said lateral housing wall around said material outlet, said collar having an outlet opening extending in a plane oblique to the direction of material discharge, means being provided outwardly of said collar selectively to restrict the outlet area of said collar outlet opening, said restricting means comprising a closure element moveable between a position in which said oblique collar outlet opening is substantially closed and opening positions in which said oblique collar outlet opening is selectively uncovered, adjustable means being provided controlling the movement of said closure element to selectively establish the resistance offered by said restricting means against discharge of material through said outlet.
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19. Apparatus of the type used for treating cellulose pulp, comprising two intermeshing rotary screws driven synchronously within a housing having lateral and end walls and having a material inlet and a material outlet in the range of respectively an inlet and an outlet end of the housing, each screw on a cylindrical core carrying a surface section constituting a treating screw thread, said screw thread comprising a feeding screw thread section starting near said inlet and having a terminal end spaced from said housing outlet end, said cylindrical core further carrying a feed-reversing surface section starting near the terminal end of said feeding screw thread section and having a terminal end near said housing outlet end, said material outlet being provided in the lateral wall of said housing adjacent the terminal end of the feeding screw thread sections of both screws for discharge of treated material substantially at right angles in relation to a plane through the axes of said screws, said screws being caused to rotate during operation of said apparatus such that opposed corresponding portions on said screws are caused to move towards each other in the range of rotation extending between the lateral housing wall portion in which said material outlet is provided and a plane through the axes of said screws, the pitch of the thread on both screws being selected to establish a high material pressure zone within said housing in the range of said material outlet, said material outlet cooperating with means selectively restricting the outlet area of said material outlet.
Specification