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US 5,176,261 AGranted
Rotor for pressure sorters for sorting fibrous suspensions
AssigneeHermann Finckh Maschinenfabrik GmbH & Co.
InventorEmil Holz
Life of this patent
Estimating the term…
Abstract
Rotor for pressure sorters for sorting fibrous suspensions, comprising a plurality of cleaning vanes provided for the circulation on the inlet side of a screen cylinder of the pressure sorter, these vanes being designed in sections as return regions and in sections as supply regions; the return regions are designed such that they urge the fibrous suspension portions adjacent the screen inlet side away from the screen cylinder, whereupon these fibrous suspension portions are diverted by the supply regions of the cleaning vanes towards the screen inlet side and fed back to the latter.
Claims19
A method for sorting a fibrous suspension in a pressure sorter having a rotationally symmetrical screen with an inlet side and an outlet side and a plurality of cleaning vanes arranged in close proximity to said inlet side of said screen and extending approximately parallel to said inlet side, wherein there is relative rotational movement between the screen and said cleaning vanes about a central axis of said screen, the improvement comprising the steps of
- (a) urging first portions of the suspension away from the inlet side of said screen by first sections of said vanes;
- (b) mixing said first portions with fresh suspension to be sorted thereby obtaining a mixture;
- (c) directing said mixture to second sections of said vanes;
- and
- (d) returning said mixture to the screen inlet side by said second vane sections.
2 more elements
A pressure sorter for sorting fibrous suspensions and comprising:
- a housing;
- a rotationally symmetrical screen mounted in said housing, said screen having an inlet side, an outlet side and a screen axis, and defining an inlet chamber adjacent said inlet side having first and second axial end regions, and an accept stock chamber adjacent said outlet side;
- a rotor mounted in said housing for rotation about said screen axis, said rotor having a circumferential wall being rotationally symmetrical to said screen axis and facing the inlet side of the screen;
- an inlet to said housing in communication with the first axial end region of said inlet chamber for feeding a suspension to be sorted into said inlet chamber;
- an accepted stock outlet from said housing in communication with said accepted stock chamber;
- a rejects outlet from said housing in communication with the second axial end region of said inlet chamber;
- said rotor having means for circulating and advancing said suspension between the inlet side of the screen and the circumferential wall of the rotor in a circumferential direction about said screen axis and in the axial direction of said axis along a helical flow path from said first axial end region toward said second axial end region of said inlet chamber;
- a plurality of cleaning vanes mounted on the circumferential wall of said rotor for rotation in close proximity to the inlet side of said screen, at least some of said cleaning vanes having first sections which in cross section transverse to the screen axis are similar to an airfoil with a leading edge portion facing in the direction of rotation for producing positive pressure pulses in the suspension within said inlet chamber and with a trailing edge portion facing in the opposite direction for producing negative pressure pulses in the suspension within said inlet chamber, said cleaning vanes extending transversely to the direction of rotation of said rotor and approximately parallel to the inlet side of the screen;
- wherein at least some of said first cleaning vane sections have at said leading edge portion a wedge-shaped profile in cross-section approximating an acute angle oriented obliquely towards the inlet side of said screen, said profile having a first side facing the screen and a second side forming an obtuse angle with the direction of rotation of said rotor and facing away from said screen for urging suspension away from the inlet side of said screen;
- and wherein at least some of said cleaning vanes have second sections disposed relative to said first sections such that the suspension urged away from the inlet side of the screen by said first sections impinges on said second sections, said second sections having a leading edge portion facing in the direction of rotation, said leading edge portion having a first side facing said screen and diverging therefrom at an acute angle in said direction of rotation for urging suspension towards the inlet side of said screen.
7 more elements
A pressure sorter for sorting fibrous suspensions and comprising:
- a housing;
- a rotationally symmetrical screen mounted in said housing, said screen having an inlet side, an outlet side, and a screen axis, and defining an inlet chamber adjacent said inlet side having first and second axial end regions, and an accept stock chamber adjacent said outlet side;
- a rotor mounted in said housing for rotation about said screen axis within said inlet chamber;
- an inlet to said housing in communication with the first axial end region of said inlet chamber for feeding a suspension to be sorted into said inlet chamber;
- an accepted stock outlet from said housing in communication with said accepted stock chamber;
- a rejects outlet from said housing in communication with the second axial end region of said inlet chamber;
- said rotor having means for circulating and advancing said suspension adjacent the inlet side of the screen in a circumferential direction about said screen axis and in the axial direction of said axis along a helical flow path from said first axial end region toward said second axial end region of said inlet chamber;
- said rotor having a plurality of bar-like cleaning vanes arranged for rotation in close proximity to the inlet side of said screen, at least some of said cleaning vanes having first sections which in cross section transverse to the screen axis are similar to an airfoil with a leading edge portion facing in the direction of rotation for producing positive pressure pulses in the suspension within said inlet chamber and with a trailing edge portion facing in the opposite direction for producing negative pressure pulses in the suspension within said inlet chamber, said cleaning vanes extending transversely to the direction of rotation of said rotor and approximately parallel to the inlet side of the screen;
- wherein at least some of said first cleaning vane sections have at said leading edge portion a wedge-shaped profile in cross-section approximating an acute angle oriented obliquely towards the inlet side of said screen, said profile having a first side facing the screen and a second side forming an obtuse angle with the direction of rotation of said rotor and facing away from said screen for urging suspension away from the inlet side of said screen;
- and wherein at least some of said cleaning vanes have second sections disposed relative to said first sections such that the suspension urged away from the inlet side of the screen by said first sections impinges on said second sections, said second sections having a leading edge portion having a first side facing said screen and diverging therefrom at an acute angle in said direction of rotation for urging suspension towards the inlet side of said screen.
7 more elements
Dependencies are inferred from the claim text.