Rejects sorting apparatus

Claim 2

A sorting apparatus for sorting fiber suspensions which are heavily laden with rubbish and other contaminants, said sorting apparatus comprising: a first sorting unit and a second sorting unit successively arranged; a rotor mounted in said apparatus and extending through said first and second sorting units; a first and second rotationally symmetric strainer for each of said first and second sorting units, respectively, and mounted therein; a first and second ring-shaped strainer space defined between said rotor and said strainer in each of said first and second sorting units, respectively, which strainer spaces are immediately successively arranged; means for providing diluting water to said second strainer space; said first sorting unit at a pressure above atmospheric pressure and above that of said second sorting unit; each of said strainers and said first and second sorting units cooperating to define a first accepts space and a second accepts space therebetween, respectively, which accepts spaces are radially outward of said strainers; means located at transition from said first sorting unit to said second sorting unit for providing a pressure drop thereat by restricting the flow between said first strainer space and said second strainer space, said means including a ringlike diaphragm mounted and operable between said first sorting unit and said second sorting unit.

Claim 3

A sorting apparatus as claimed in claim 1 further comprising an outlet socket which outlet is open to said first accepts space and has a valve means mounted therein for selectively controlling flow through and sealing said outlet.

Claim 4

A sorting apparatus as claimed in claim 1 wherein said second strainer space defines a first end in proximity to said first strainer space and a second end; said second strainer space having a rejects outlet (31) open to atmospheric pressure at said second end and said second sorting unit defines at least one accepts space outlet open to the atmosphere and providing communication from said second unit accepts space.

Claim 5

A sorting apparatus as claimed in claim 1 wherein said second strainer space and second accepts space are at atmospheric pressure.

Claim 6

A sorting apparatus as claimed in claim 1 further comprising sorting elements mounted and operable on said rotor in each of said first and second strainer spaces.

Claim 7

A sorting apparatus as claimed in claim 5 wherein said sorting elements in said second sorting unit are ribs, which have a compact cross section.

Claim 8

A sorting apparatus as claimed in claim 5 wherein said sorting elements in said first sorting unit are blocks which have a straight, essentially radial edge forwardly situated in the direction of rotation and a steadily tapering rear edge.

Claim 9

A sorting apparatus as claimed in claim 5 wherein said sorting elements in said second sorting unit are plate-shaped ribs which radially extend from said rotor and are longitudinally aligned on said rotor in at least one row.

Claim 10

A sorting apparatus as claimed in claim 1 wherein said first strainer has a first diameter and said second strainer has a second diameter, one of said first diameter and second diameter being larger than the other, said diameters having a diameter difference therebetween, which diameter difference is at the most ten percent of said larger diameter.

Claim 11

A sorting apparatus as claimed in claim 1 wherein said ringlike diaphragm is adjustable.

Claim 12

A sorting apparatus as claimed in claim 10 wherein said adjustable ringlike diaphragm is an iris type diaphragm.

Claim 13

A sorting apparatus as claimed in claim 1 further comprising an annular disk mounted in said second strainer space and cooperating with said rotor to define a gap therebetween; said annular disk and second unit strainer cooperating to define a first part of said second strainer space in proximity to said first sorting unit and a second part of said second sorting space; said rotor defining a rotor axis; said annular disk having a top point and a bottom point, and inclined about said rotor axis from said top point to said bottom point toward said ringlike diaphragm.

Claim 14

A sorting apparatus as claimed in claim 12 wherein said means for providing diluting water communicates with said first part of said second strainer space, which first part is operable as a diluting and wash zone and which second part is a dehydrating zone.

Claim 15

A sorting apparatus as claimed in claim 1 wherein the second strainer has a diameter and the seconds strainer space has a radial expanse defined between the rotor and the strainer of the second strainer space, and said radial expanse said second accepts space is at least twenty percent of the second strainer diameter.

Claim 16

A sorter apparatus as claimed in claim 1 wherein said rotor defines a rotor axis; said rotor and rotor axis inclined at an angle from the horizontal; said first sorting unit and second sorting unit generally longitudinally aligned along said rotor axis; said second sorting unit having a bottom; a bottom weir mounted and operable in said second sorting unit bottom, said bottom weir operable to restrict flow through said second sorting unit and defining a wash zone and a dehydrating zone in said second sorting unit.

Claim 17

A sorting apparatus as claimed in claim 12 further comprising a ringlike chamber mounted in said first part of said second sorting unit, which ringlike chamber has a bottom region and surrounds said second strainer; an extraction line extending from said chamber to the exterior of said second sorting unit and communicating therebetween, which line is positioned at said ringlike chamber bottom region, and, a control valve in said extraction line, which control valve is operable to control the outflow from said ringlike chamber, thereto being also connected a diluting water line.

Claim 18

A sorting apparatus for sorting fiber suspensions which are heavily laden with rubbish and other contaminants, said sorting apparatus comprising: a first sorting unit and a second sorting unit successively arranged; a rotor with a rotor axis mounted in said apparatus and extending through said first and second sorting units; a first and second rotationally symmetric strainer for each of said first and second sorting units, respectively, and mounted therein; a first and second ring-shaped strainer space defined between said rotor and said strainer in each of said first and second sorting units, respectively, which strainer spaces are immediately successively arranged; sorting elements mounted and operable on said rotor in each of said first and second strainer spaces; said second strainer space defining a first end in proximity to said first strainer space and a second end, said second sorting unit defining a rejects outlet open to atmospheric pressure at said second end; means for providing diluting water to said second strainer space; said first sorting unit at a pressure above atmospheric pressure; each of said strainers and said first and second sorting units cooperating to define a first accepts space and a second accepts space therebetween, respectively, which accepts spaces are radially outward of said strainers, said second sorting unit further defining at least one accepts space outlet open to the atmosphere and providing communication from said second accepts space; said first sorting unit having an outlet socket operable to communicate suspension from said first accepts space and having a control valve in said outlet socket to control or seal suspension flow therethrough; a ringlike diaphragm mounted and operable between said first sorting unit and said second sorting unit, which diaphragm is operable to restrict the flow between said first strainer space and said second strainer space; an annular disk mounted in said second strainer space cooperating with said rotor to define a gap therebetween, which annular disk and second strainer cooperating to define a first part of said second strainer space in proximity to said first sorting unit and a second part of said second strainer space, said annular disk having a top point and a bottom point and inclined about said rotor axis with said bottom point toward said ringlike diaphragm.

Claim 19

A sorting apparatus for sorting fiber suspensions which are heavily laden with rubbish and other contaminants, said sorting apparatus comprising: a first sorting unit and a second sorting unit successively arranged; a rotor with a rotor axis mounted in said apparatus and extending through said first and second sorting units; a first and second rotationally symmetric strainer for each of said first and second sorting units, respectively, and mounted therein; a first and second ring-shaped strainer space defined between said rotor and said strainer in each of said first and second sorting units, respectively, which strainer spaces are immediately successively arranged; sorting elements mounted and operable on said rotor in each of said first and second strainer spaces; said second strainer space defining a first end in proximity to said first strainer space and a second end, said second sorting unit defining a rejects outlet open to atmospheric pressure at said second end; means for providing diluting water to said second strainer space; said first sorting unit at a pressure above atmospheric pressure; each of said strainers and said first and second sorting units cooperating to define a first accepts space and a second accepts space therebetween, respectively, which accepts spaces are radially outward of said strainers, said second sorting unit further defining at least one accepts space outlet open to the atmosphere and providing communication from said second accepts space; said first sorting unit having an outlet socket operable to communicate suspension from said first accepts space and having a control valve in said outlet socket to control or seal suspension flow therethrough; a ringlike diaphragm mounted and operable between said first sorting unit and said second sorting unit, which diaphragm is operable to restrict the flow between said first strainer space and said second strainer space; an annular disk mounted in said second strainer space cooperating with said rotor to define a gap therebetween, which annular disk and second strainer cooperating to define a first part of said second strainer space in proximity to said first sorting unit and a second part of said second strainer space, said annular disk having a top point and a bottom point and inclined about said rotor axis with said bottom point toward said ringlike diaphragm.

Claim 20

A sorting apparatus as claimed in claim 17 wherein said sorting elements in said second sorting unit are ribs, which having a compact cross section.

Claim 21

A sorting apparatus as claimed in claim 17 wherein said sorting elements in said first sorting unit are blocks which have a straight, essentially radial edge forwardly situated in the direction of rotation and a steadily tapering rear edge.

Claim 22

A sorting apparatus as claimed in claim 17 wherein said sorting elements of said second sorting unit are plate-shaped ribs which radially extend from said rotor and are longitudinally aligned on said rotor in at least one row.

Claim 23

A sorting apparatus as claimed in claim 17 wherein said first strainer has a first diameter and said second strainer has a second diameter, one of said first diameter and second diameter being larger than the other, said diameters having a diameter difference therebetween, which diameter difference is at the most ten percent of said larger diameter.

Claim 24

A sorting apparatus as claimed in claim 17 wherein said ringlike diaphragm is adjustable.

Claim 25

A sorting apparatus as claimed in claim 17 wherein said adjustable ringlike diaphragm is an iris type diaphragm.

Claim 26

A sorting apparatus as claimed in claim 17 wherein said means for providing diluting water communicates with said first part of said second strainer space, which first part is operable as a diluting and wash zone and which second part is a dehydrating zone.

Claim 27

A sorting apparatus as claimed in claim 17 wherein the second strainer has a diameter and the second strainer space has a radial expanse defined between the rotor and the strainer of the second strainer space and said radial expanse is at least twenty percent of the second strainer diameter.

Claim 28

A sorting apparatus as claimed in claim 17 further comprising a ringlike chamber mounted in said first part of said second sorting unit, which ringlike chamber has a bottom region and surrounds said second strainer; an extraction line extending from said chamber to the exterior of said second sorting unit and communicating therebetween, which line is positioned at said ringlike chamber bottom region; and, a control valve in said extraction line, which control valve is operable to control the outflow from said ringlike chamber.