Filter element with support body

Details Filter element with support body Filter element with support body

1996-09-10

1998-04-07

Walker, W. L.

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

210499, 55500, 55501, 55502, B01D 2915

Patent

active

057360456

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to filter element with a support body incorporating a support tube which can engage a filter mat and which is provided with apertures for the flowthrough of a filtered medium. The apertures are formed by the axial spacings between separate rings of the support body. The rings are supported by support walls. The support walls subdivide the interior of the support tube into separate chambers.


BACKGROUND OF THE INVENTION

The structure of the filter elements varies from manufacturer to manufacturer. In the case of simple filter elements constructed of paper, the filter mats are manufactured without the supporting wire gauze. With greater pressure differentials on the filter elements, the filter folds can be pressed together, causing a part of the filter material to remain unused for filtration.
Higher quality elements have a multilayer mat construction. The mat is pleated or folded to increase the effective filtration surface. Thus, the filter mat, which may also be called the filter fleece, is not pressed together during high pressure differentials. A support body is provided in the higher quality elements, generally in the form of a support tube, on which the fluid-permeable filter mat can be supported by a suitable mounting. The dimensions of the apertures in the support tube are determined such that the filter gauze of the filter mat cannot be pressed into the apertures, which could negatively influence the filtration performance.
A portion of the support body used until this time for filter elements has a solid support tube of metal produced from a flat blank. A noble metal or galvanized steel is used to maintain corrosion protection. The support tube has circular holes, each in the form of a borehole, forming the apertures. Generally, the support tube is arranged in the flowthrough direction of the fluid behind the filter mat. In this manner, the relevant apertures serve for flowthrough of the already filtered medium, generally filtered hydraulic oil. In the known supporting bodies, the entire arrangement is made accessible. The holes forming the flowthrough surface are relatively limited, and the supporting surface is relatively extensive. This arrangement yields a good support of the filter mat. However, the flowthrough is inhibited, and consequently, the filtration performance is limited. The manufacture of the metal support tube in the form of a hollow cylinder having circular apertures is costly, and therefore, expensive to manufacture. Furthermore, because of the solid construction of the known support bodies, the filter element is likewise heavy, which is particularly disadvantageous with filter elements of large structure.
A filter element with a support body constructed of lengthwise and transverse rods, generally forming meshed grid, is disclosed in German Patent. No. 32 38 783. The grid forms the apertures and is supported on a cylinder carrying body constructed comparable to the support tubes in the known filter elements. In the traditional filtration flow direction, from the outside to the inside, this filter element has a filter mantle as a filter mat supported on the support tube. The support tube is supported in turn on the carrying body or carrying tube, which likewise is provided with apertures.
To attain further reinforcement of this supporting and carrying structure, within the carrying body and connected with it, four diametrically oppositely arranged support walls are provided. Two support walls are always connected with each other with a circular segment, and are arranged offset at an angle from one another and with axial spacing from one another, forming a generally helical line within the joint. The carrying body is formed as the metal support tubes used until this time. The support body is formed of plastic material in the form of polypropyhlene. The mesh grid of the support body, formed of longitudinal and transverse ribs, has burled elevations, facing at least outward. The filter mantle is set in operation Such that at t

REFERENCES:
patent: 4526688 (1985-07-01), Schmidt, Jr. et al.
patent: 5118421 (1992-06-01), Scarano
patent: 5223134 (1993-06-01), Riva
patent: 5308485 (1994-05-01), Griffin et al.

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