Liquid filter

A liquid filter, comprising:

• a filter housing,
• a ring filter insert, replaceably arranged in the filter housing, and
• a removable cover arranged to close the filter housing during operation,
• the filter housing including at least one inlet for raw liquid to be filtered, which inlet leads into a raw side of the filter housing, and
• a return extending from a clean side of the filter housing for filtered clean liquid,
• an eccentric opening arranged in a bottom of the filter housing,
• the ring filter insert comprising a hollow-cylindrical filter material body, surrounded on front sides by top and bottom front panels, the ring filter insert separating the raw side of the filter housing and the clean side of the filter housing from each another,
• an eccentric blocking element for the eccentric opening arranged on the bottom front panel,
• first and second interacting positioning means each on one of the ring filter insert and the filter housing and arranged to bring the blocking element into engagement with the eccentric opening when the ring filter insert is inserted into the filter housing,
• the first positioning means comprising an inclined plane,
• the second positioning means comprising a radially protruding nose which is arranged opposite the inclined plane, and
• the inclined plane and the nose arranged to be movable in relation to each other in such a way that they slide along each other and bring the blocking element into engagement with the eccentric opening, by rotating the ring filter insert relative to the filter housing,
• the inclined plane being one of embodied and arranged on one of the inner circumference of the ring filter insert and the outer circumference of a filter housing part arranged inside the ring filter insert and the radially protruding nose being one of embodied and arranged on the other of the inner circumference of the ring filter insert and the outer circumference of the filter housing part,
• the inclined plane comprising an incline which excludes a self-locking and
• the eccentric opening being an outlet for emptying the filter housing when the filter insert is removed.

A ring filter insert for a liquid filter, comprising

• a hollow-cylindrical filter material body surrounded on front sides by top and bottom front panels and which can be replaceably arranged in a filter housing,
• an eccentric blocking element arranged on the bottom front panel for engaging an eccentric opening in the filter housing,
• first positioning means on the ring filter insert, which interact with second positioning means on the filter housing when the ring filter insert is inserted into the filter housing and which are arranged to bring the blocking element into engagement with the eccentric opening,
• the first positioning means being one of an inclined plane and a radially protruding nose, with the second positioning means being the other of the inclined plane and the radially protruding nose,
• the inclined plane and the nose arranged to be moved in relation to each other in such a way that they slide along each other and bring the blocking element into engagement with the eccentric opening, by rotating the ring filter insert relative to the filter housing,
• the first positioning means being one of embodied and arranged on an inner circumference of the ring filter insert.