Gas separation – With means securing or retaining separating media – Unit or cohesive sheet-like media in flow line or frame
Patent
1998-06-15
1999-09-14
Woo, Jay H.
Gas separation
With means securing or retaining separating media
Unit or cohesive sheet-like media in flow line or frame
55499, 55500, 55501, 55502, B01D 3908
Patent
active
059517298
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a filter, especially an air filter for the air intake of an internal combustion engine.
DE-PS 5 14 778 discloses a filter insert in which the filter element consists of a pleated filter element. Supporting tubes are disposed on the end disks of the filter element. These supporting tubes consist especially of plastic and are provided with strengthening rings. A disadvantage of this filter insert is that the filter element must be replaced only together with the supporting tubes.
It is also known to dispose a filter element on a perforated sheet metal supporting tube. This sheet metal tube, however, is necessary as an additional element in a filter housing and thus signifies elevated production equipment costs and higher manufacturing costs.
The invention is addressed to the problem of creating a filter which can be manufactured inexpensively, involves low disposal costs, and is pressure-stable.
This problem is solved, setting out from the preamble of the principal claim, by the distinctive features thereof. An important advantage of the invention is that additional elements, supporting tubes or the like are not necessary, since the knife-blade buttresses are part of the housing. Thus there is no need to dispose of such additional parts.
In an advantageous embodiment of the invention, the knife-blade buttresses extend to the point of greatest flexure of the filter medium, that is, approximately into the center part of the filter medium. Both this area is thus supported as well as outer areas over which the knife-blade buttresses extend.
According to an embodiment, additional knife-blade buttress or fixation means for the filter medium is provided on the cover which closes the housing. This cover thus serves on the one hand for the supplemental positioning of the filter medium, and on the other hand for the stabilization thereof.
In an additional embodiment it is proposed to provide the knife-blade buttress with supporting shoes. These shoes enable a greater area of the filter medium to be supported. At the same time the shoes avoid point stresses in the supported area.
According to a further embodiment of the invention, the filter medium can be provided with glue beads. These glue beads improve the internal stability of the filter medium. Moreover they serve as points or surfaces of contact with the knife-blade buttress.
In an advantageous manner the filter cover can be fastened on the housing without additional sealing means. For this purpose sealing lips are formed on the cover which is made of a thermoplastic or on the housing which is also made of thermoplastic. These sealing lips can additionally be configured as labyrinth seals.
These and other features of preferred embodiments of the invention will appear not only in the claims but also in the description and the drawings, while the individual features can be realized individually or plurally in the embodiment of the invention and in other fields, and may represent independently patentable embodiments for which protection is hereby claimed. Embodiments of the invention are represented in the drawings and will be further explained herein. The drawings show:
FIG. 1 two half-sectional representations of a filter,
FIG. 1A an enlarged view of an embodiment of the sealing structure,
FIG. 2 a section of a side view,
FIG. 3 a variant of a closure.
The filter in FIG. 1 consists of a filter housing 10 which has a raw air inlet 11, a clean air outlet 12 and a cover 13. The housing and the cover are advantageously made of plastic by injection molding. In the housing is a filter element 14 which is made of pleated filter paper (filter medium). This filter element has sealing disks 15, 16. These consist for example of soft polyurethane foam. The sealing disks serve both for sealing the ends, and for sealing the filter element 14 at radial sealing surfaces 17, 18 and ribs 43, 44 of the housing and cover, respectively. In the upper half section, both the housing 10 and the cover 13 are provided each with knife-blade buttresses 19, 20. Each of
REFERENCES:
patent: 4929263 (1990-05-01), Kasugai
patent: 5391212 (1995-02-01), Ernst et al.
Ernst Volker
Klotz Arthur
Leipelt Rudolf
Sommer Bruno
Filterwerk Mann & Hummel GmbH
Hopkins Robert A.
Woo Jay H.
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