Filter device, has bypass chamber sealed by ring seal with different thickness diameter regions in contact with annular support inside filter casing

摘要

The seal for the bypass chamber (18) in between the filter element (10) and inner wall of the casing (1) is formed by a ring (22) having a greater thickness at its external diameter region than at its internal diameter region. The radial surfaces of the ring are in contact with an annular support (21) inside the casing and one of the filter element end surfaces. The outer axial end surface of the ring is positioned against the inner wall of the casing and the inner axial end surface contains a cavity which is accessible by the unfiltered fluid. A filter device for separating particles from a fluid comprises a cylindrical filter element extending axially inside a cylindrical casing and designed to receive the unfiltered fluid at one axial end surface and discharge the filtered at the other axial end surface. The filter element includes a permeate discharge and the casing includes an inlet (3) for the unfiltered fluid and outlets (4, 7) for the filtered fluid and permeate. The seal for the bypass chamber in between the filter element and inner wall of the casing is obtained using a ring having a greater thickness at its external diameter region than at its internal diameter region. One of the two radial surfaces of the ring forms a seal against an annular support inside the casing and the opposite surface forms a seal against one of the filter element end surfaces. The outer axial end surface of the ring is positioned against the inner wall of the casing and the inner axial end surface contains a cavity which is accessible by the unfiltered fluid.