Liquid purification or separation – Structural installation – Flume stream type
Patent
1995-09-22
1998-06-23
Lithgow, Thomas M.
Liquid purification or separation
Structural installation
Flume stream type
210155, 210159, 210162, 210357, E02B 508, B01D 2970, B01D 3352
Patent
active
057700559
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention refers to a strainer for removing particles from effluent, comprising a screen with a plurality of fixed parallel aligned bars and displaceable bars, arranged in a plane inclined downwards into a flow of water, with the edges of said bars turned towards the flow direction of the water being stepped, and the displaceable bars being interconnected in parallel to at least one package, which is operable by means of a drive mechanism, located at the upper end of the strainer, above the flow of water, to bring about a closed circuitous path in the plane of the bars, said path including a vertical component of movement surpassing the step height of the bars.
BACKGROUND OF THE INVENTION
Strainers according to above are used for instance by sewage disposal plants for separation of particles from effluent and are among other known from SE 448106.
Due to the existence of hair and other fibres as well as abrasive particles in the liquid, it is expedient to locate the drive mechanism and those moving parts that are connected to it above the surface of the effluent. This has entailed certain drawbacks, for example due to the need for a relatively high and bulky stand for the installation of the strainer. During the installation, it is necessary to level the stand and make exact alignments for the support of the displaceable part of the strainer, so that the shafts become parallel. By the positioning of the bearings for the displaceable part of the strainer rather high above the bottom end of the strainer, a leverage will be created as a result of the pressure of the water against the lower part of the strainer, which causes strains in the construction which must be compensated for by upgrading of bearings and the material thickness.
Strainers also exist which have a more simple design, by which the drive means for rendering the bottom part of the displaceable strainer a closed circuitous path has been omitted in order to lower the costs for manufacture and installation. Therefore, this part of the strainer will only move back and forth and will not participate efficiently in upwards feeding motion.
THE TECHNICAL PROBLEM
One purpose of the present invention is to provide a strainer which can be manufactured for less costs and be installed more easily than before, without having the functional drawbacks.
THE SOLUTION
This is achieved in accordance with the invention in that the drive mechanism is connected via at least one pull means to a respective link mechanism, which is located at the bottom end of the strainer in the flow of the water to support the bottom end of the displaceable bar package.
SPECIFICATION OF THE DRAWINGS
The invention is described hereinafter with reference to an embodiment which is shown in the enclosed drawings, wherein
FIG. 1 discloses a strainer according to the invention in a side view,
FIG. 2 shows the strainer in FIG. 1 in a front view,
FIG. 3 is a view from below of the strainer mainly showing its drive mechanism,
FIG. 4 is a side view disclosing in an enlarged scale, the bottom end of the strainer, and
FIG. 5 shows the encapsulation of the link arms.
DESCRIPTION OF EMBODIMENT
The strainer according to the invention is in accordance with prior art installed as an inclined plane in a not shown channel or flume, in such a manner that it reaches down with its bottom end into a stream of effluent which is to be treated. The bottom end of the strainer is supported on the channel bottom and the level of the fluid normally reaches up approximately to level line 10 in FIG. 1.
The device includes a screen 12 located in the accommodation between two side beams 11 (see FIG. 2), which screen according to prior art includes alternately fixed and displaceable bars 13 and 14 respectively (see FIG. 4) to form an oblique plane downwards into the flowing water, with the edges of the bars 13, 14 which are turned towards the flow direction of the water being stepped. In this manner, the set of bars 13, 14 form a fixed grid package and a displaceable grid pac
REFERENCES:
patent: 1698387 (1929-01-01), Brome
patent: 1751421 (1930-03-01), Reid
patent: 1751422 (1930-03-01), Reid
patent: 1773576 (1930-08-01), Downes
patent: 4853116 (1989-08-01), Wallander
patent: 5013430 (1991-05-01), Mileson
patent: 5032262 (1991-07-01), Wallander
patent: 5098561 (1992-03-01), Grabbe
Hedman Lars
Wallander Carl-Otto
Hochstrasser Erich
Lithgow Thomas M.
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