Infeed disc for disc-type refiners
First Claim
1. An infeed disc for a disc refiner comprising a plate unit having a first aperture for mount thereof to and rotation by a drive shaft, said plate unit having an infeed face and an operating face and at least one additional aperture forming an infeed passage one end of which opens from said infeed face and the other of which opens from said operating face, said passage being skewed and essentially curved as it extends from said one end thereof to the other and said other end of said passage being circularly offset from said one end thereof in a path about said first aperture.
1 Assignment
0 Petitions
Accused Products
Abstract
An infeed disc for a disc refiner has infeed passages which are circularly spaced by portions thereof which define spokes. The spokes and the passages have special characteristics. The center line of each passage is skewed with reference to the axial center line of the disc, in both an axial and a circular sense, and thereby curved, causing the passage to be essentially curved to provide a circular offset of the openings from the respective ends of each passage. The disc is further characterized by a non-radial skewed orientation of its spokes, the center line of each spoke being angularly inclined to a plane which is radial to and includes the central axis of the disc. The centers of the respective axially spaced infeed and operating surface portions of the spokes are offset one from the other, in a circular sense. The leading and trailing edges of each infeed passage at the operating face of the disc are also each respectively offset from the corresponding leading and trailing edges at the infeed face of the disc, in a circular sense, about the central axis of the disc. One wall surface of each spoke provides the leading wall portion of one of the passages, having regard to direction of rotation of the disc in use, and is distinguished by a longitudinally extended offset at the entrance end of the passage of which it forms a part. This offset is in the direction of disc rotation and creates an insuction effect as the disc rotates.
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Citations
19 Claims
- 1. An infeed disc for a disc refiner comprising a plate unit having a first aperture for mount thereof to and rotation by a drive shaft, said plate unit having an infeed face and an operating face and at least one additional aperture forming an infeed passage one end of which opens from said infeed face and the other of which opens from said operating face, said passage being skewed and essentially curved as it extends from said one end thereof to the other and said other end of said passage being circularly offset from said one end thereof in a path about said first aperture.
- 9. An infeed disc for a disc refiner comprising a plate unit having a first aperture for mount thereof to and rotation by a drive shaft, said plate unit having an infeed face and an operating face and at least one additional aperture forming an infeed passage, said passage having the center of one end thereof circularly offset from the center of its other end to provide that its center line is essentially curved from said one end thereof to the other and said passage being defined by bounding wall portions including a leading wall portion and a trailing wall portion, having regard to the direction of rotation of said disc in use, said leading wall portion having therein an offset, said offset being at one end of said passage, and the configuration of said offset providing a low pressure pocket producing an insuction and directional influence on material approaching said one end of said passage which supplements that provided by the centrifugal force per se developed on rotation of said disc.
- 11. An infeed disc for a disc refiner comprising a plate unit having a first aperture for mount thereof to and rotation by a drive shaft, said plate unit having an infeed face and an operating face and at least one additional aperture forming an infeed passage, said passage being defined by bounding wall portions including a leading wall portion and a trailing wall portion, having regard to the direction of rotation of said disc in use, said leading wall portion having therein an offset, said offset being at one end of said passage and having a smoothly arcuate profile formed by a plurality of longitudinally extending curved surface portions of said leading wall portion and the configuration of said offset providing a low pressure pocket producing an insuction and directional influence on material approaching said one end of said passage which supplements that provided by the centrifugal force per se developed on rotation of said disc.
- 15. An infeed disc for a disc refiner comprising a plate unit having a first aperture for mount thereof to and rotation by a drive shaft, said plate unit having an infeed face and an operating face and being formed with a plurality of infeed passages each of which has an axial center line which is essentially curved and one end thereof opening from said infeed face and the other end thereof opening from said operating face, said passages being spaced, in a circular sense, by means defining spokes in said discs which have a non-radial orientation.
- 17. An infeed disc for a disc refiner comprising a plate unit having a first aperture for mount thereof to and rotation by a drive shaft, said plate unit having an infeed face and an operating face and being formed with a plurality of infeed passages each of which is essentially curved, as determined by its axial center line, from one end to the other and has one end thereof opening from said infeed face and the other end thereof opening from said operating face, said passages being spaced, in a circular sense, by means defining spokes in said disc, side surfaces of each said spoke in a circularly following sense respectively defining a trailing wall portion of one said passage and a leading wall portion of a following of said passages, having regard to the direction of rotation of said disc in use, said leading wall portion having a longitudinally extended offset forming a pocket at said one end of said passage formed to provide insuction and directional influence on material approaching said one end of said passage which supplements that provided by centrifugal force per se developed on rotation of said disc in use.
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19. An infeed disc for a disc refiner comprising a plate unit having a first aperture for mount thereof to and rotation by a drive shaft, said plate unit having an infeed face and an operating face and being formed with a plurality of infeed passages each of which has one end thereof opening from said infeed face and the other end opening from said operating face, said passages being spaced, in a circular sense, by means defining spokes in said disc, side surfaces of each said spoke respectively defining a trailing wall portion of one said passage and a leading wall portion of a following of said passages, having regard to the direction of rotation of said disc in use, and said leading wall portion having therein a longitudinally extended offset at said one end of said passage formed to provide insuction and directional influence on material approaching said one end of said passage which supplements that provided by centrifugal force developed per se on rotation of said disc in use, said offset in each said passage being in the intended direction of rotation of said disc in use and having a smoothly arcuate profile formed by a plurality of longitudinally extending curved surface portions of said leading wall portion.
Specification