Liquid purification or separation – Flow – fluid pressure or material level – responsive – Fluid pressure responsive by-pass
Patent
1993-09-14
1996-12-31
Savage, Matthew O.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Fluid pressure responsive by-pass
210136, 210232, 210437, 210438, 210450, 210455, 210457, 2104932, B01D 3502
Patent
active
055890601
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a filter for liquids, in particular a lubricating-oil filter for an internal-combustion engine according to the introductory part of claim 1.
Such a filter for liquids is known, for example from U.S. Pat. No. 3,333,703. The filter for liquids shown there consists of a pot-shaped filter housing which, at its one end, is connected with a mounting head via a screw thread, and provided at its other open end with a screw-on housing cover. A filter element supported in the interior of the filter housing is provided with end disks and separates the crude space from the clean space. On the end disk of the filter element disposed opposite the housing cover, an overflow valve is mounted which, under certain operating conditions, establishes a connection between the crude space and the clean space. In connection with the other end disk of the filter element and the closed end of the filter housing, provision is made for a return check valve. A drawback with said design is, on the one hand, the waste disposal of the filter element, which consists of all sorts of different materials, and, on the other hand, that when the filter element is changed, at least the overflow valve is discarded because it is rigidly integrated in the end disk of the filter element.
A filter for liquids is known from U.S. Pat. No. 4,622,136 in connection with which a support part is supported in a separable filter housing, said support part receiving an annular filter element. Said annular filter element, which itself has to effect a separation between the crude and clean spaces by tightly resting against the support part, has to be pushed with its total length over the support part, which means damaging of the filter element and/or a weakening of the sealing effect cannot be excluded.
A lubricating oil filter with a separable housing is known from DE-OS 39 03 675, in connection with which a filter insert provided with face-side end disks is rigidly connected with the housing cover, the latter being screwable to the filter housing. With said design, however, no provision is made for a support part for receiving individual elements and extending at least partly centrally through the interior space of the filter element, from which support part the filter element is separable and thus exchangeable alone.
Therefore, the problem of the present invention is to find a filter for liquids with a constructionally simple structure in connection with which the filter element can be discarded as waste separately and in a way friendly to the environment, whereby the other functionally important individual parts can be reused.
The solution to said problem is obtained with a filter for liquids with the features according to the characterizing part of claim 1.
Advantageous developments of the invention are contained in the dependent claims.
Exemplified embodiments according to the invention are shown in the drawing, in which:
FIG. 1 shows a sectional view of the filter for liquids according to the invention;
FIG. 2 shows a sectional view of a second embodiment of a filter for liquids according to the invention;
FIG. 3 shows a partially sectional view of a third embodiment of a filter for liquids according to the invention;
FIG. 4 shows a sectional view of a fourth embodiment of a filter for liquids according to the invention; and
FIG. 5 shows a sectional view of a fifth embodiment of a filter for liquids according to the invention.
A filter for liquids 1 according to FIG. 1 consists of a pot-shaped filter housing which, at its one end, is provided with the feed and discharge openings 3 and 4, respectively, and connectable, for example with a mounting head, and at its other end closed by a removable housing cover 5. Provision is made for a seal 6 between the screw-on housing cover 5 and the filter housing 2. A filter element 7 made of paper is designed as a star filter and pocket-glued and separates the crude space from the clean space 9. At each of its ends, it is provided on its inner circumference with a sleeve 10 made of strengthen
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Bruss Elke
Gebert Hans
Guntert Dietwart
M ohle Rolf
M uller Hubert
Knecht Filterwerke GmbH
Savage Matthew O.
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