Rt-filtertechnik Gmbh

Dirk Schönfeld

Gerhard Stehle

Michael Otto Sakraschinsky

Alexander Wohlers

Frank Oberli

John Otto

Florentin Van Uffelen

Klaus Morgens

Marco Tassone

Markus Stefan Walek

Sven Peter Wozniak

Alexander Backes

A filter device has a filter housing (), in which a replaceable filter element () is accommodated. The filter housing has a cover part (), wherein the element material () of the filter element () extends between two end caps () of the filter element. The filter housing () is formed as an outlet pipe (). The element material and the outlet pipe extend between both end caps ().

Filter device

A filter element has a preferably multilayer structure of a pleated filter medium () with a plurality of individual filter pleats (). Due to an alternating sequence of filter pleats () with a first pleat height (h) and filter pleats () with a second pleat height (h), more effective filter surfaces are available than with filter pleats with a uniform pleat height. Upon throughflow by a fluid to be filtered, a lower surface load for the filter medium (and lower passage speed of the fluid are present during filtration. A static loading of the filter medium () during operation of the filter is then reduced. A hydraulic circuit has such a filter element ().

Filter element and hydraulic circuit with such a filter element

A filter element () has an inner body () and an outer body (). One casing body () has a cross section deviating from circularity. Body contact surfaces () face one another for the contact of essentially all filter folds (--) of a pleated filter web (). The filter folds (--), in terms of fold height (h), are divided into individual groups (I, II) each having several filter folds (-) of a common fold height (h, h) alongside one another in sections. Between two adjacent filter folds (--) of different groups (I, II) filter folds are arranged (-) of at least one third group (III). The filter folds (-) of the third group (III), in the manner of step formation, have a common fold height (h) different from the respective fold height (h, h) of the filter folds (-) of the two adjacent neighboring groups (I, II), and/or, in the manner of curve formation, have different fold heights, establishing a transition between the fold heights (h, h) of the two adjacent groups (I, II).

Filter element

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Schwabsdorf, Germany

Dirk Schönfeld