Cartridge filter with frame

Details Cartridge filter with frame Cartridge filter with frame

2000-04-14

2001-08-14

Upton, Christopher (Department: 1724)

Liquid purification or separation

With repair or assembling means

C210S485000, C210S493300, C055S496000, C055S501000, C055S521000

Reexamination Certificate

active

06274039

ABSTRACT:

FIELD OF THE INVENTION
Cartridge filters are used for constructing filtering installations. In so doing, the filter elements are arranged in a frame or box to assure the sealing and supporting function, as well as easy interchangeability.
BACKGROUND OF THE INVENTION
DE-OS 195 02 366, which discloses a cartridge filter having a pleated filter element and a frame composed of plates, is incorporated herein by reference for these teachings. The plates are arranged around the lateral surfaces of the filter element and are joined together in the area of their ends by an adhesive layer. Another adhesive layer is provided to affix the filter pack to the plates in a dust-tight manner.
A cartridge filter of this kind is assembled such that the plates forming the box are glued in succession to the filter element and finally bonded to one another. In so doing, the plates must be positioned exactly to achieve a clean bonding.
SUMMARY OF THE INVENTION
The object of the invention is to so simplify the production of a cartridge filter such that it is possible to dispense with costly positioning and retaining devices, as well as adhesive agents or other separate bonding means.
The present invention provides a cartridge filter having a filter element and a frame formed of plates. the plates being installable around the filter element and being interconnectable in the area of their sides. The plates have plug-in connectors which interact with corresponding plug-in connectors of adjacent plates and affix the plates to one another.
In contrast to the known bonded frame, the assembly is markedly simplified, since no application or hardening time of adhesive is necessary.
Advantageously, each plug-in connection comprises at least one projection which is arranged on a first plate and may be forced into engagement with a cavity of a second plate. The projection may extend toward the second plate. The projection of a plate is bent with respect to the plate, for example, by approximately 90°, and extends toward the second plate.
Furthermore, advantageously the plates form a top frame and/or base frame in the area of the plug-in connection. It is thereby possible to accommodate the plug-in connection in a space-saving manner without increasing the dimensions typically used.
If the plates are of matching length and shape, the frame can be produced from a single basic element.
In addition to the plug-in connection, a catching mechanism or clasp with interlocking parts can be employed. The catching mechanism can be releasable or permanent. The individual plates are mutually supported in this manner.
Furthermore, in place of or in addition to the plug-in connection, it is possible to provide lugs that fold over. Lugs may be particularly useful in the area further from the plug-in connection.
To further improve the mechanical cohesion, an interlocking ridge and groove connection can be provided along the contact line of two plates.
To further reinforce the frame of the cartridge filter, a protective grating can be provided which joins the plates, at least in the area of an end face of the filter element. In this manner, the filter element is protected from mechanical contacts during the installation.
The protective grating and the plate are expediently affixed to one another by a detent connection.
To seal the filter element vis-a-vis the plates of the cartridge-filter frame, it is advantageous if the filter element abuts against the plates under prestressing.
Expediently, sealing strips may be inserted between the filter element and the plates. It is also possible to provide sealing mats covering the inner side of the plates. The purpose of these sealing elements is to ensure dust-proof sealing. In this context, understood by these sealing elements is also a layer of adhesive. Here, a bracing would not be necessary.
To affix the filter element in its spatial position in the frame, the plates can overlap the filter element with a bar in the region of one end face of the filter element.
Furthermore, an assembly kit is proposed for producing a cartridge filter which has a block-shaped pleated-filter element and four matching plates that may be affixed to one another by a plug-in connection and may be pressed sealingly with the pleated-filter element.


REFERENCES:
patent: 813727 (1906-02-01), Marqundt
patent: 1122437 (1914-12-01), Sweeney
patent: 2175903 (1939-10-01), Lichtman
patent: 2565698 (1951-08-01), Patterson
patent: 2909237 (1959-10-01), O'Dell
patent: 3252580 (1966-05-01), Getzin
patent: 3280984 (1966-10-01), Sexton et al.
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patent: 3392846 (1968-07-01), Getzin
patent: 3478498 (1969-11-01), Savermann
patent: 3479803 (1969-11-01), Smith
patent: 3747772 (1973-07-01), Brown
patent: 4617122 (1986-10-01), Kruse et al.
patent: 5188646 (1993-02-01), Nolen, Jr.
patent: 5476526 (1995-12-01), Attermayer
patent: 6007596 (1999-12-01), Rosen
patent: 195 02 366 (1996-08-01), None
patent: 351682 (1990-01-01), None
patent: 2211110 (1989-06-01), None

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