FILTER CARTRIDGE
A filter cartridge for a household appliance, which is provided with a filter housing, the wall of which separates a housing internal side from a housing external side. A filter inlet opening which in the operation of the filter cartridge is open in relation to the external environment of the filter housing is provided, wherein a device for water conduction which comprises at least one filter chamber having at least one filter medium and terminates in a filter outlet opening for suctioning water from the filter cartridge is provided in the interior of the filter housing downstream of the filter inlet opening relative to the flow direction during operation, and wherein a filter connection element having an annular filter port which has an annular filter fixing face for the tight connection of the filter cartridge to a tank fixing face in the water tank is provided.
1 . A filter cartridge for a household appliance, which is provided with a filter housing the wall of which separates a housing internal side from a housing external side, wherein a filter inlet opening which in the operation of the filter cartridge is open in relation to the external environment of the filter housing is provided, wherein a device for water conduction which comprises at least one filter chamber having at least one filter medium and terminates in a filter outlet opening for suctioning water from the filter cartridge is provided in the interior of the filter housing downstream of the filter inlet opening relative to the flow direction during operation, and wherein a filter connection element having an annular filter port which has an annular filter fixing face for the tight connection of the filter cartridge to a tank fixing face in the water tank is provided, characterized in that
the profile of the first filter fixing face along the circumference of the annular filter port has a variable radius in relation to a central axis, so that the first filter fixing face comprises radial convexities and/or radial concavities wherein the convexities and/or concavities have a round profile and in that the convexities and concavities form a wave shape along a circular line, wherein the wave shape is composed of an alternating sequence of convex circle segments, forming the convexities, and concave circle segments, forming the concavities.
2 . The filter cartridge as claimed in claim 1 , characterized in that the filter fixing face is simultaneously provided as a filter sealing face.
3 . The filter cartridge as claimed in claim 1 , characterized in that the annular filter port of the filter connection element, which has the filter fixing face at least in the region of the filter fixing face has a wall having a wall external side that runs parallel to a wall internal side and comprises or forms the filter fixing face.
4 . The filter cartridge as claimed in claim 1 , characterized in that the arrangement of the radial convexities and radial concavities of the filter fixing face is configured so as to be rotationally symmetrical over the circumference.
5 . The filter cartridge as claimed in claim 1 , characterized in that the arrangement of the convexities and concavities of the filter fixing face is configured with the same angles over the circumference.
6 . The filter cartridge as claimed in claim 1 , characterized in that the convexities and concavities of the filter sealing face form a wave shape along a circular line wherein the wave shape consists of an alternating sequence of convex circle segments forming the convexities and concave circle segments forming the concavities.
7 . The filter cartridge as claimed in claim 1 , characterized in that the concave and convex circle segments are connected tangentially at turning points at the transition between concave and convex curvatures.
8 . The filter cartridge as claimed in claim 1 , characterized in that the arc length of the convex circle segments is longer than the arc length of the concave circle segments.
9 . The filter cartridge as claimed in claim 1 , characterized in that the convex and the concave circle segments have the same segment radius S.
10 . The filter cartridge as claimed in claim 1 , characterized in that the convex and the concave circle segments lie within an outer envelope circle and outside an inner envelope circle wherein the circle centers of the convex circle segments lie within the inner envelope circle and the circle centers of the concave circle segments lie outside the outer envelope circle.
11 . The filter cartridge as claimed in claim 1 , characterized in that the radius of the inner envelope circle is between 5% and 15% of the radius of the outer envelope circle.
12 . The filter cartridge as claimed in claim 1 , characterized in that the radius of the convex and/or concave circle segments is between 20% and 35% of the radius of the outer envelope circle.
13 . The filter cartridge as claimed in claim 1 , characterized in that the wall thickness (W) between the wall internal side running parallel to the wall external side is between 5% and 15% of the radius of the outer envelope circle.
14 . The filter cartridge as claimed in claim 1 , characterized in that the turning points of the curvature of the circle segments are closer to the inner envelope circle than to the outer envelope circle.
15 . The filter cartridge as claimed in claim 1 , characterized in that the annular filter port of the filter connection element, which has the filter fixing face at least in the region at least of the filter fixing face provided as the filter sealing face is composed of a plastics material which is more dimensionally stable in comparison to an elastomer at operating temperature.
16 . The filter cartridge as claimed in claim 1 , characterized in that the annular filter port of the filter connection element has an external wall and/or an internal wall which, in relation to the operating position of the filter cartridge, is/are beveled at an angle ω1 and/or ω2 to the vertical so that the external wall and the internal wall of the filter cartridge converge from top to bottom in a manner inclined to one another.
17 . The filter cartridge as claimed in claim 1 , characterized in that the beveled external wall has an outer and/or the beveled internal wall has an inner filter fixing face.