FI96490B - Filter - Google Patents

Description

1 96490

Filter - Filter This application is split separated from application 922108.

The present invention relates to a filter comprising a sleeve-like body of membrane-like filter material formed with pleats to increase the filtration area and releasably attached at each end between two nested support portions of the filter body, respectively, profiled at opposite edges.

Filters are known in which the membrane of filter material and the frame supporting it form a single, integral element which is replaceable at the stage when the membrane is clogged or otherwise exhausted. The film of filter material, which is typically paper or non-woven polymer fiber, is attached to the frame of plastic or metal in these filters by gluing or in connection with injection molding, or implemented in a so-called With Hot Melt adhesive technology. Such replaceable filter elements have been used, for example, in the filtration of the intake air of the car engine and in the fresh air ducts leading to the interior of the car.

25 j- In said known filter elements it is practically impossible to separate and recycle the materials, so that the elements end up as waste in their entirety. In some cases, they have to be treated as hazardous waste. The large proportion of frame parts in the amount of waste material to be treated is then an obvious drawback.

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The above-mentioned problem is avoided in filters in which a piece of filter material is removably attached to the supporting parts 35. In this case, when the piece of filter material is clogged, it is not necessary to dispose of the entire filter, but it is sufficient to replace the filter material with a new one. The invention relates to this type of filter solution.

96490 2 GB patent 1,273,251 discloses a filter comprising a cylindrical body of axially pleated filter material interposed at each end between folded nested support members profiled in accordance with the pleats. The outer support part consists of articulated segments which are wound around the filter body and joined together to form a ring which closes the filter body in place. A similar filter is also shown in Figures 21-21C of GB Application 2,162,768, in which the outer support ring of the end of the 10 cylindrical filter pieces consists of parts which are fixed in place by separate fasteners.

It is an object of the present invention to provide a filter consisting of a sleeve-like piece of filter material and removable supports which is even simpler in construction. The invention is characterized in that the filter body has a truncated cone in its basic shape.

An essential advantage of the invention is that the conical nature of the filter body allows the body to be mounted in place simply by pressing the support parts against each other so that the end of the filter body is between them. Both the inner and outer support members may be formed in a single unit that retains its shape. The support parts can be arranged to: · move relative to each other in the direction of the axis of the filter body and their opposite edges are preferably oblique to said axis corresponding to the taper of the cone.

30

According to the invention, the support parts may consist of a plate-like part at each end of the filter body, profiled at its outer edge according to the pleating of the filter body, and a surrounding annular part 35 correspondingly profiled at its inner edge.

The truncated cone-shaped piece of filter material used in the filter according to the invention may be folded

Il «Ui I MI I! t «f 96490 3 rack of folding material such as paper, polymer fiber non-woven or the like. Such filter bodies can be prefabricated as filter replacement parts.

The invention will now be described in more detail by way of example with reference to the accompanying drawings, in which Figure 1 shows a filter according to the invention with a pre-pleated truncated cone-shaped filter body 3 shows the end of the filter according to Fig. 1 in section III-III from Fig. 1.

15

The drawings show a filter 1 according to the invention, in which a paper-folded, folded filter body 14 is in the shape of a truncated cone. The filter body 14, which is pre-pleated and seamed in advance, is shown in Figure 2. The support parts are formed according to Figures 1 and 3 by a plate-like part 17, 17 'at each end 15, 16 profiled at each end of the filter body 14 and a surrounding inner edge a profiled annular portion 25 18, 18 '. The inner support portion 17 of the upper end 15 of the filter body and the outer support portion 18 'of the lower end 16 are connected to each other by a shaft rod 19 passing through the filter body. Thereafter, the support members 17, 18; 17 ', 18', the opposite edges of which are oblique to the shaft rod 19 corresponding to the taper of the cone, are tightened against the ends 15, 16 of the filter body and against each other by tension nuts 20, 21 at the ends of the shaft.

96490 4

According to the arrows in Fig. 1, the air flow to be filtered takes place from the outside into the conical filter body 14, from which the filtered air continues to the outlet 5 in the plate-shaped inner support part 17 at the lower end 16 of the filter body.

It will be clear to a person skilled in the art that the various embodiments of the invention are not limited to the above-mentioned Example 10, but may vary within the scope of the appended claims. For example, the filter material may be not only paper but also fabric, fiberglass mesh or viscose fiber pulp or the like non-woven fiber, which may be located between two layers of paper. The latter material is suitable, for example, for car fresh air filters, which remove dust from the air entering the car's interior. In addition to gases, the filter according to the invention is also suitable for filtering liquids, e.g. as an oil filter.

Claims (4)

A filter (1) comprising a hollow-shaped piece (14) of membrane-like filter material, which mainly has the shape of a truncated cone and in which folds are formed to increase the filtration surface, characterized in that the filter body (14) at each end (15, 16) ) are detachably secured between two mutually supporting supports (17, 18), the opposing edges of which are profiled to correspond to the folds of the filter body and that the support members (17, 18) are attached to a common shaft rod (19) 10 passed through the filter body (14). ). Filter according to claim 1, characterized in that the end (15, 16) of the filter body (14) is clamped between the support parts (17, 18) which are mutually displaceable in the axial direction of the body. 3. Filter according to claim 2, characterized in that the opposing edges of the support parts (17, 18) are inclined so as to correspond to a tapered cone in relation to the axis of the filter body 20 (14). Filter according to claim 2 or 3, characterized in that the supporting parts (17, 18) at each end (15, 16) of the filter body (14) consist of a disc-shaped part (17) profiled according to the folding of the filter body and an annular part (18). ) with corresponding profiled inner edge surrounding it. il lii i lii H I I 4 M I · t