US 4,081,381 AGranted

Filtering apparatus

AssigneeRosenmund AG

InventorsPeter Rosenmund, Hans Brodbeck

Life of this patent

Estimating the term…

Loading patent…

Abstract

An industrial filtering apparatus in which the filter cake can be removed automatically by scraping layers of solid from the cake with paring devices which are associated with screw conveyors for transporting the solid to the center of the housing and depositing it in a removal pipe. The mouth of the removal pipe through which the cake falls is completely unobstructed by structural members. The paring devices can also be used in a different mode to smooth out cracks and compact the cake. There is also an independent revolving device for breaking up the cake which can be used in conjunction with a sprinkler head to ensure particularly intensive and intimate washing and slurrying of the cake. The paring device, its associated screw conveyors and the removal pipe can be raised and lowered, as can the device for breaking up the cake, thus making adjustment to any filter cake thickness possible.

Claims11

Dependent claims

A filtering apparatus for the industrial discontinuous separation of solids from liquids whereby the solids are accumulated on a filter element to form a filter cake which is removed automatically, said apparatus comprising:

(a) a housing having a floor and a central axis,
(b) means for mounting the filter element inside the housing,
(c) inlet means on one side of the filter element for introducing mother liquor to be filtered,
(d) outlet means on the other side of the filter element to discharge the filtrate,
(e) a filter cake removal opening positioned in the center of the housing floor,
(f) means for removing the solids of the filter cake out of the housing,
(g) said solids removing means being mounted to move for adjustment to the thickness of the filter cake,
(h) said solids removing means including conveyor means mounted to rotate about the central axis for conveying the solids from the filter cake toward the removal opening and removal pipe means mounted to move within the removal opening,
(i) said removal pipe means having a mouth fixedly disposed adjacent the conveyor means to receive said filter cake solids,
(j) means for sealing between the removal opening and the movably disposed removal pipe means to prevent the mother liquor from flowing out therebetween, and
(k) hollow shaft means is mounted for up and down movement coaxially with the vertical main axis of the filtering apparatus,
(l) said conveyor means and an upper section of said removal pipe means being fixedly secured to the hollow shaft means,
(m) said removal pipe means upper section being suspended from the lower end section of the hollow shaft via at least two suspension members which do not obstruct the mouth of the removal pipe means near the delivery end of the conveyor means.

10 more elements

(a) a housing having a floor,
(b) means for mounting the filter element inside the housing,
(c) inlet means on one side of the filter element for introducing mother liquor to be filtered,
(d) outlet means on the other side of the filter element to discharge the filtrate,
(e) a filter cake removal opening positioned in the center of the housing floor,
(f) means for removing the solids of the filter cake out of the housing,
(g) said solids removing means being mounted to move for adjustment to the thickness of the filter cake,
(h) said solids removing means including conveyor means for conveying the solids from the filter cake toward the removal opening and removal pipe means mounted to move within the removal opening,
(i) said removal pipe means having a mouth fixedly disposed adjacent the conveyor means to receive said filter cake solids, and
(j) means for sealing between the removal opening and the movably disposed removal pipe means to prevent the mother liquor from flowing out therebetween,
(k) hydraulic means which act in opposite directions are mounted on the housing to effect the adjustable movement for the solids removing means,
(l) said conveyor means includes at least one screw conveyor,
(m) a first hollow shaft is mounted for up and down movement coaxially with the vertical main axis of the filtering apparatus,
(n) the upper end of the hollow shaft being rigidly fixed to a drive means and the lower end of first hollow shaft being rigidly fixed to the screw conveyor,
(o) a drive shaft is mounted within the first hollow shaft and drivingly connected to the screw conveyor,
(p) said hydraulic means includes two pairs of hydraulic cylinders,
(q) one pair of hydraulic cylinders acts on the first hollow shaft and drive shaft to be raised and lowered,
(r) whereby the removal pipe means in its raised condition prevents the mother liquor from flowing into said mouth and out through said removal pipe means and by lowering the removal pipe means the filter cake solids are discharged therethrough via the screw conveyor,
(s) the other pair of hydraulic cylinders act on a second hollow shaft mounted coaxially with the first hollow shaft, and
(t) filter cake breaking up means are disposed at the lower end of the second hollow shaft.

17 more elements

Dependencies are inferred from the claim text.