Filter element
AssigneeRt-Filtertechnik GmbH
InventorsFrank Oberli, Dirk Schoenfeld
Life of this patent
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Abstract
A filter element has a preferably multilayer structure of a pleated filter medium (3) with a plurality of individual filter pleats (5, 7). Due to an alternating sequence of filter pleats (5) with a first pleat height (h1) and filter pleats (7) with a second pleat height (h2), 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 (30 and lower passage speed of the fluid are present during filtration. A static loading of the filter medium (3) during operation of the filter is then reduced. A hydraulic circuit has such a filter element (1).
Claims10
A filter element, comprising:
- a tubular and pleated filter medium having a central longitudinal axis;
- first filter pleats having a first pleat height;
- second filter pleats having a second pleat height less than said first pleat height, said first and second filter pleats being arranged in an alternating sequence providing a greater effective filtering surface than if said pleated filter medium had filter pleats having a uniform pleat height of said first pleat height, providing a corresponding flow-through of a fluid to be filtered resulting in an overall lower surface load to said filter medium and providing a lower flow-through velocity of fluid during filtration, thereby resulting in a reduced static charge of said filter medium during filter element operation;
- and
- planar sections of said filter pleats each extending in a plane containing an entire length of said central longitudinal axis.
Dependencies are inferred from the claim text.