Liquid purification or separation – Filter – Movable medium
Patent
1997-08-08
1999-08-10
Reifsnyder, David A.
Liquid purification or separation
Filter
Movable medium
210374, B01D 3306
Patent
active
059354380
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a pusher centrifuge with a centrifuge drum, a pusher bottom, a filler pipe for the material to be centrifuged connected to the centrifuge housing and extending coaxially into the centrifuge drum, and a distribution cone positioned downstream of the filler pipe and concentric thereto having its end with the greater diameter facing the pusher bottom at a distance so as to leave an annular gap.
In pusher centrifuges of this type there is a need to accelerate the material to be centrifuged, for increasing the throughput while at the same time gently treating sensitive solid particles and reducing wear at the centrifuge, especially wear of the slotted screen in the supply area, to the angular velocity of the solid particle cake within the centrifuge drum.
In an attempt to solve this problem, in a pusher centrifuge known from German Patent DE 28 48 156 C2 the material to be centrifuged is unsatisfactorily preaccelerated through a guiding wall, extending perpendicularly to the centrifuge axis, to an angular velocity of the filter cake formed so that a spontaneous dewatering, required for forming a push-resistance solid particle cake within the supply area, cannot be ensured. This results in a reduction of the mass throughput within the pusher centrifuge. From German Patent 43 08 749 a pusher centrifuge is furthermore known in which the material to be centrifuged is accelerated to a high velocity by a pump wheel-like insert between the pusher bottom and the guide disk. However, the constructively resulting high radial acceleration component, which is even further enhanced by the number of the pump wheel vanes, results in great wear of the slotted screen coating within the supply area.
The object of the invention is therefore to provide a pusher centrifuge with which solid materials can be separated from liquids with optimal mass throughput and with reduced wear of the slotted screen coating within the supply area.
SUMMARY OF THE INVENTION
Inventively, this object is solved in that an annular cup is fastened at the pusher bottom which concentrically surrounds the end of the distribution cone and which projects into the centrifuge drum.
A pusher centrifuge according to the present invention is primarily characterized by: the centrifuge drum, wherein material to be centrifuged is introduced into the centrifuge drum through the filler pipe in a direction of filling; centrifuge drum; positioned facing the pusher bottom and spaced from the pusher bottom by an annular gap; from the pusher bottom into the centrifuge drum and surrounding the wide end of the distribution cone.
The annular cup defines a groove facing the wide end of the distribution cone, the groove having a bottom of a part-polygonal cross-sectional contour.
The annular cup has an outer, part-polygonal cross-sectional contour.
The radial spacing between the annular cup and an inner wall of the centrifuge drum is selected based on constructive specifications and operative data of the pusher centrifuge and the material to be centrifuged so that during operation of the pusher centrifuge a filter cake is formed within the centrifuge drum radially outside of the annular cup.
An outer radius Ra of the annular cup, relative to an inner radius Ri of the centrifuge drum and an effective length ls of a screen of the centrifuge drum, is within a range of Ra=Ri- 0.15 ls and Ra=Ri- 0.22 ls.
The annular cup is fastened to the pusher bottom and comprises axial drain openings extending through the pusher bottom.
The centrifuge may further comprise a sealing ring extending radially outwardly from the annular cup for sealing the pusher bottom relative to the centrifuge drum.
The distribution cone is fastened to the pusher bottom.
The distribution cone preferably is fastened to the filler pipe.
Due to the centrifugal force the annular cup is at any given time filled with material to the overflow edge. The continuously fed material is accelerated within the annular cup by the rotating suspension ring in a gentle manner t
REFERENCES:
patent: 4073731 (1978-02-01), Fanta
patent: 4226724 (1980-10-01), Sturmer
Reifsnyder David A.
Siebtechnik GmbH
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