Liquid purification or separation – Filter – Movable medium
Patent
1997-01-08
1998-12-29
Walker, W. L.
Liquid purification or separation
Filter
Movable medium
210423, 210426, 210427, 210432, 55422, 137549, 13762547, B01D 3504, B01D 3522
Patent
active
058535845
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a self-cleaning filter for filtering of liquids and gases, particularly for filtering liquids within the paper and pulp industry, according to the preamble of claim 1.
Within all process industry it is more and more common to arrange processes to the fullest possible extent closed in order to reduce the loss of material and not the least to prevent environmental pollution.
For instance, when dewatering pulp, the pulp contains fibres of different sizes, and for that reason some solid particles will be brought along by the water to a greater or smaller extent.
The fact that particles (fibres) tend to be brought along by the water creates problems for subsequent equipment. Filtrate water is commonly sent back to the machine it came from or sent further forward in the process to be used for instance for nozzles for flushing, filter cake removal and washing. Such nozzles have relatively small apertures (0,5-0,7 mm) to reduce the water consumption. Thus, there is a need to remove solid particles by filtration.
Today, there are numerous systems for separating solid particles from a liquid. Normally, these are atmospheric or pressurized tanks including filter elements of different kinds. Continuously working filters are big and clumsy, and their filter elements tend to yield under high pressures. Non-continuous filters involve interruptions in the process for backwashing or other cleaning of the filter elements.
From the Danish laid-open patent application 117.288 is previously known a self-cleaning filter according to the preamble of claim 1. In this filter, however, the channels are directed in a complicated manner within the housing as well as in the rotating body, particularly as concerns channels for discharge of reject at backwashing. Further, the channels extending through the rotatable body are conically tapering in the flow direction, which, apart from complicated manufacture, results in an increased pressure drop as well as clogging by particles brought along by the fluid being filtered.
The present invention has as its object to provide a filter of the kind stated which is not suffering from the drawbacks mentioned and which is moderate in size, has resistant filter elements and works substantially continuously, that is, that cleaning of clogged filter elements shall be enabled without considerable interruptions in the filtering process. Further, the filter shall be simple to maintain.
These objects are achieved by a filter according to the present invention which has been given the characteristic features stated in the appended claims.
The invention will be described hereinafter, reference being made to the attached schematic drawings, wherein:
FIG. 1 is a vertical section through a filter housing having a rotatable body according to a first embodiment of the invention,
FIG. 2 is a section taken along line II--II of FIG. 1,
FIG. 3 is a section corresponding to the section according to FIG. 1 through a filter housing having a rotatable body according to a second embodiment of the invention,
FIG. 4 is a section taken along line IV--IV of FIG. 3, and
FIG. 5 is a scheme showing a control of a filter according to the invention .
The embodiment of the invention shown in FIGS. 1 and 2 includes a substantially cubical housing 1 defined by walls 2, 3, 4, 5, 6, and 7. A through bore 8 extends between the walls 2 and 4. A cross bore 9 opening in the wall 5 connects to the bore 8. The mouth of the bore 8 in the wall 2 constitutes an inlet port 10 and its mouth in the wall 4 constitutes a first outlet port 11. The mouth of the bore 9 in the wall 5 constitutes a second outlet port 12.
In a spherical recess 13 in the housing 1 is accomodated a likewise spherical body 14 rotatable about an axis 15. A first bore or fluid channel 16 having a first end 16a and a second end 16b extends diametrically through the body 14. The bore 16 is perpendicular to the axis 15 and has substantially the same diameter as the bore 8. A second bore or fluid channel 17 being substantially concentrical to the a
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Safwenberg Bjorn
Solbakke Hans Terje
Bandak AS
Walker W. L.
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