Liquid purification or separation – Filter – Supported – shaped or superimposed formed mediums
Patent
1998-10-19
2000-07-11
Savage, Matthew O.
Liquid purification or separation
Filter
Supported, shaped or superimposed formed mediums
210450, 2104932, 55502, 277640, 277651, 277944, B01D 2700
Patent
active
060867639
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to a front disc of a filter insert.
A disc is known as a part of a filter insert from DE 44 16 577 A1. The FIG. 6 of this document discloses a disc which in its area adjacent to the aperture is continuously slightly thickened, and is thermally welded in this thickened area with the sealing. The welding in this case extends across approximately the total surface area of the thickened area inwards in the area of the aperture, the sealing projects such that after plugging the disc onto a connection piece it is compressed and upset whereby the required sealing effect is attained.
With this known disc sealing combination, with only little effort, a sufficiently safe sealing could be attained, however, it has been found in practical operation that during the manufacturing relatively small tolerances have to be maintained in order to ensure a safe sealing on the one hand, and on the other hand, to avoid a too tight fit of the disc on the connection piece, and that furthermore it is desirable to make the manufacturing of the disc even more economical by accelerating the welding process when connecting the disc and the sealing.
SUMMARY OF THE INVENTION
It is proposed for attaining the object to provide a disc of the type mentioned before which is characterized in radially spaced outwards continuously around the aperture, compressed in its area between the connection piece and the welding build-up, and material of the sealing ring being upset radially outwards and thereby compressed.
With the disc according to the present invention, several advantages are attained, namely on the one hand an improved sealing effect with reduced requirements to the tolerances during the manufacturing, and on the other hand a faster manufacturing of the disc by reducing the required welding time. The improved sealing effect is attained in that the radially inner area of the sealing which serves for the sealing may move across a larger radial area independent from the disc for a compression in radial direction. With the arrangement according to the invention, in particular by the radial spacing of the welding build-up from the aperture a spacially defined compression area for the sealing ring is provided wherein the compression area when viewed in radial direction of the disc has a significantly larger extension as it is in a disc according to the state of the art according to the document stated in the beginning with a sealing ring attached to the thickening. This enlargement of the compression area in radial direction of the disc on the one hand results in a relatively easy plugging onto and drawing off the disc from the associated connection piece, and on the other hand, guarantees the required sealing without the occurance of a wedging of the sealing ring between the connection piece and the disc in the area of its aperture which would counteract the easy movement. It is a surprise that in spite of the relatively large spacing of the area of the welding connection between the disc and the sealing ring from the inner edge of the sealing ring the ring will reliably seal. As the welding connection is restricted to the area at the upper side of the welding build-up, the compression area provided for the compression of the sealing ring in radial direction is exactly defined although plastic material fleece or felt is used as a material for the sealing which as such has only a relatively low form stability. With the welding build-up according to the invention because of its relatively large height it is furthermore attained that the sealing effect between the connection piece and the disc is guaranteed independent from the plugging direction of the disc onto the connection piece. The flapping of the radially inner area of the sealing ring and a wedging between the outer circumference of the connection piece and the inner circumference of the disc for attaining the required sealing effect is no longer required.
Preferably, it is provided in an embodimen
REFERENCES:
patent: 5660729 (1997-08-01), Baumann
patent: 5736040 (1998-04-01), Duerrstein et al.
Ing. Walter Hengst GmbH & Co.
Savage Matthew O.
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