Filter with a replaceable filter insert

摘要

A fluid filter with a housing, a releasable cover, and a replaceable filter having a filter body and two end discs. The filter is plugged onto a housing pipe and a locking ring is guided on the pipe, preloaded in a push-out direction. The locking ring is locked in a pushed-out position by a locking device. An unlocking device guided by the filter unlocks the locking device when the filter is pushed onto the pipe and enables the locking ring and the filter to be pushed in. When the filter is fitted into the housing, a seal on the end disc or locking ring interacts with a housing sealing surface to separate an untreated filter side from a clean side. When the locking ring is in the pushed-out position and the filter bears against the locking ring, the seal is held away from the sealing surface of the housing.

主权项

1. A filter for a fluid medium, comprising a filter housing and a cover, which is releasably connectable to the filter housing, comprising a replaceable filter insert, which comprises a hollow-cylindrical filter cloth body and two end discs, enclosing the hollow-cylindrical filter cloth body frontally, a first end disc encompassing a central through hole, wherein, leading with the first end disc, the filter insert can be plugged onto a central stand pipe, which forms part of the filter housing, wherein a locking ring is guided in an axially displaceable manner on the stand pipe, wherein the locking ring is preloaded by a force acting in a pushed-out direction pointing towards a free end of the stand pipe, wherein, in a pushed-out position, the locking ring is locked by a locking device against being pushed in, wherein provision is made for unlocking means, which are guided by the filter insert and which, when the filter insert is pushed onto the stand pipe, actuate the locking device in an unlocking direction and enable the locking ring and the filter insert to be pushed in, and wherein, when the filter insert is fitted into the filter housing, a seal provided on one of the first end disc and on the locking ring interacts with a sealing surface of the filter housing to separate an untreated medium side from a clean medium side of the filter, comprising:
when the locking ring is in the pushed-out position and when the filter insert is in axial contact with the locking ring, the seal provided on one of the first end disc of the filter insert and on the locking ring is held at an axial distance from the corresponding sealing surface of the filter housing in the pushed-out direction and is held in the non-sealing position at a distance from the sealing surface by means of the locking device and the sealing surface and the seal interact so as to form a seal when the one of the filter insert and the locking ring carrying the seal is in the pushed-in position when the locking device is unlocked.