Liquid purification or separation – Filter – Movable medium
Patent
1994-07-25
1996-04-23
Savage, Matthew O.
Liquid purification or separation
Filter
Movable medium
210402, 425197, B01D 3346
Patent
active
055100309
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a filter apparatus for flowable material containing solid particles, in particular to synthetic plastics melts containing impurities, comprising a housing in which a filter element is disposed, said filter element being rotational symmetrical to an axis and having on its periphery a plurality of penetration openings similar to holes for the filtered matter, said housing comprising an inlet opening for supplying the material to be filtered to the filter element to the outer side of its periphery, so that the filtered material penetrates the filter element from the outside to an inner hollow space being in flow connection with an outlet opening of the housing, whereas for a continuous removal of the residual matter from the periphery of the filter element a scraper element is provided which is disposed coaxially to the filter element and engages the outer periphery of the filter element and follows its curvature, so that the residual matter is carried through an annular gap disposed between the filter element and the housing with a component of its motion directed in axial direction of the filter element towards a separate exit, and wherein the filter element for its rotation around its axis is connected to a drive means.
A filter apparatus of this kind is known for a mud suction carriage (EP-A 164,004).
Another filter apparatus has become known from the EP-A 411,163. Within this known construction a flange disposed at one front end of the filter element is fixed to the housing and scraper element that is wound around the outer periphery of the filter element in form of a spiral strip is rotated by means of a driving shaft around the axis of the hollow cylindrical filter element. Thereby, on the one hand, the residual matter is scraped off the outer periphery of the filter element, and, on the other hand, the residual matter is conveyed towards the exit opening of the housing. This known construction has the disadvantage that the scraper element that is helically wound around the filter element tends to adhere to the outer periphery surface of the filter element, because reaction forces act onto this scraper element which are caused by the impurities taken off and by the friction between the filter element and the scraper element wound around it. If one tries to avoid this disadvantage by a correspondingly increased gap between the inner surface of the helical strip and the outer periphery of the filter element, then the scraping effect of the spiral strip is no more sufficient. This disadvantage can reliably be avoided only then if the spiral strip is provided with a great wall thickness, but this is of detrimental influence upon the entire dimension, in particular to the outer diameter of the housing accommodating the filter element. Further, no self adjustment is possible in order to obtain a clearance-free interaction between the filter element and the scraper element.
The invention has at its object to reliably avoid the described disadvantages without increasing the diameter of the housing. The invention solves this task by the features that the scraper element is divided into several partial elements, which are resiliently abutted in radial direction of the filter element within the housing confining the annular gap on its outside, and each of which engages the filter element along a helix section or a spiral line section only over a section of the axial length of the filter element and is hold in the housing secured against rotation, the partial elements, however, extending along a single-flight or multiple-flight helix or spiral line. Whereas, therefore, within the lastly described known construction the filter element stands still and the spiral-shaped scraper element is rotated, within the inventive construction the disposition is inverse, that means, the filter element is rotated and the partial elements of the scraper element stand still. Thus, the scraper element can no more jam, neither to the filter element nor to the housing and the scraper element can be disposed so
REFERENCES:
patent: 821194 (1906-05-01), Sheak
patent: 2439463 (1948-04-01), Bebauer
patent: 2560142 (1951-07-01), Tucker
patent: 2920347 (1960-01-01), Joukainen et al.
Bacher Helmut
Schulz Helmuth
Wendelin Georg
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