DE1782600C3 - Rectangular filter insert for gas filters, in particular for air intake filters of internal combustion engines and a method for producing the same - Google Patents

Description

Experience has shown that the flanging of one edge is sufficient for many purposes to achieve the required gas seal. Appropriately, this is the inflow side in each case located edge so that the gas flow through the filter does not enter it from the open side Flanging can penetrate. In cases where this is not enough, recommends the invention according to one preferred Further development that both edges of the two frame strips fjf the smooth edges of the film strip are flanged in a gas-tight manner around the two edges of the respectively assigned last fold. Along the last Insert fold then results in a labyrinthine seal by dik. Edges of the frame strips.

Preferably, the two edge strips for the unfolded insert edges are at most only by what is required Material thickness wider than the all equally wide insert folds. The two frame bars for the unfolded insert edges can then be inserted into the frame strips together with the folded insert part can be easily fitted for the folded insert edges.

The method according to the invention is based on the object of having a filter insert according to the invention a few simple process steps that are easily accessible for mass production. The inventive one The method is characterized in that the film strip along both smooth edges with the Bar of each frame strip is connected by IJmbördcln the last fold that the film strip with a folded edge and the ends of the flanged frame strips on the same side is dipped into the liquid, hardening adhesive in the tub of the third frame strip and that the same procedure is then carried out with the second folded edge and the fourth frame strip.

The invention will now be explained in more detail with reference to the drawing. In the drawing shows

F i g. 1 shows an embodiment of a filleting insert from the side onto which one, the folded edge of the Film strip bordering frame strip seen, this frame strip broken off at both ends is,

F i g. 2 the same filter insert seen in the direction of gas flow, with the dem Looking at the viewer, the frame strips surrounding the folded edges of the film strip are broken off and the frame strip for the unfolded edge has also been broken open at the bottom left,

F i g. 3 shows the left part of the filter insert according to FIG. 3 in an enlarged illustration. 1,

F i g. 4 shows the partial section according to the section IV / 1V according to FIG. 2,

F i g. 5 shows a second exemplary embodiment of the filter insert in the illustration according to FIG. J and

F i g. 6 shows a third exemplary embodiment of the filter insert, also in the illustration according to FIG. J.

The filter insert shown has a rectangular contour and is made of a film strip I like a ziehharnionika folded. The film strip I is made of porous filter paper. This filter insert 1 is rectangular Frame 2 inserted airtight. The folded edges of the film strip I are shown in Fi g. 2 marked at the top and at the bottom and much longer than the unfolded edges drawn on the left and right.

The frame strips 3 and 4 along the unfolded Edges of the film strip 1 are sheet metal strips that are assigned to the last one along their two edges Fold 5 or 6 of the filter insert 1 are flanged around. For this reason, those placed within the fold 5 Bars of the frame strip 3 are denoted by 7 and 8. The direction of gas flow is indicated by arrows 9 displayed. If you only want one in the interest of a simpler design of the filter insert Flanging, then one chooses the arrows 9, that is to say facing the inflow side, formed by the web 8, while the web 7 can then come to an end. The same applies to the frame strip 4 on the other Page.

The flanged frame strip 3, 4 is only wider than necessary, here twice the material thickness all of the same width folds in the film strip 1.

The two frame strips 10 and 11 for the folded Edges of the film strip 1 are designed in the shape of a trough. For this purpose they consist of a rectangular, elongated sheet metal strip that is bent inward along all four edges. so that a Resulting tub that is facing the film tire 1 and into which the somewhat extended film strip 1 just fits with its associated folded edge. In In the drawing, the film salt 1 is shown somewhat coarsened with regard to its fold structure, in reality more folds are provided. The frame bar 11 is designed accordingly.

During production, the film strip 1 provided with the frame strips 3 and 4 is first inserted into one tub-shaped frame strip, / for example the frame strip 11, used, which is kept open at the top. The tub in which the edge of the foil strip 1 is immersed, is poured with adhesive, which then hardens and the folded edge of the film strip I and the two frame strips 3 and 4 glued to the frame strip II. Then in one the second work step, the frame rails «. · 10 accordingly attached to the other folded edge of the film strip 1 and attached to the film strip by means of poured-in adhesive 1 glued.

The filter insert / is then ready. In the illustrated Exemplary embodiment, all frame strips 3, 4, 10. 11 have built-in ribs 12 to 12 on the outside, approximately in the middle 15 on. those for clamping the filter insert in a holder of the gas filter, for example in the intake air flow system a power fan r / eug suction device here, to serve.

The two exemplary embodiments according to FIG. 5 and b differ from those on the basis of FIG. 1 to 4 described Ausluhrungsbeispielcn only by the different design of the frame strips 3 and 4 corresponding frame strips 20, 30. These two frame strips 20,} 0 are in both exemplary embodiments on both ropes of the filter element the same, and therefore only one line of the filter element is shown. According to FIG. 5, the frame box 20 is crimped only once, namely like this. that the each uni'C /.'- iseilig located edge of victory 21 around the let / ic Trap 22 of the Folienstreil'ens 23 is crimped around. The flow direction is shown in FIG. 15 indicated by arrow 24. According to FIG. 6, the frame strip 30 is flanged on both edges. The beaded webs 31. 32 but extend together only over a fraction of the thickness of the entire film strip, so that the second fold 33, as can be seen by comparison with the illustration according to FIG. 3, can break off earlier.

In addition 7 sheets of drawings

Claims (5)

Patent claims: 1. Rectangular filter insert for gas filters, especially for intake air filters of internal combustion engines NEN, consisting of a porous, accordion-like folded film strip made of filter material, which is enclosed gas-tight in a rectangular frame, with the tight enclosure along the folded edges of the film strip a bond between the film strip and the adjacent Frame strips are provided, characterized in that for tight edging along one of the smooth edges of the film strip (1, 23) the frame strip resting on this (3, 4, 20, 30) with a protruding web (8, 21, 32) in a pocket of the foil strip (1, 23) protrudes and that the ends of this frame strip (3, 4, 20, 30) and its web (8, 21, 32) with the along the folded edges of the film strip (1, 23) extending frame strips (10, 11) connected are. 2. Filter insert according to claim!, Characterized in that that the frame strip (3, 4, 20, 30) with its web (8, 21, 32) around the last fold (5, 6) of the »5th Film strip (1, 23) is crimped and that the connection of the frame strip (3, 4, 20, 30) and their Web (8, 21, 32) with the frame strips (10, 11) extending along the folded edges Bonding (16, 17) is. 3. Filter insert according to claim 1 and 2, characterized in that the two frame strips (10, 11) for the folded edges of the foil strip (1, 23) are open to the film strip (1, 23), filled with adhesive, in which apart from the folded one Edge of the film strip (1,23) also the associated ends of the two edge strips (3, 4, 20, 30) fit and are inserted for the smooth edges. 4. Filter insert according to one of claims 1 to 3, dadurdi characterized in that each of the inflow side located edge of the frame strip (3, 4, 20, 30) is flanged. 5. Filter insert according to one of the preceding claims, characterized in that both Edges of the two frame strips (3, 4) for the smooth edges of the film strip (1) around the two Edges of the respectively assigned last fold (5, 6) are flanged in a gas-tight manner. b. Method for gas-tight enclosing an accordion-like folded, porous film strip in a frame formed from four frame strips of a rectangular filter insert according to claim 3, characterized in that the film strip (1, 23) along both smooth edges with the web (8, 21, 32) each have a frame strip (3, 4, 20, 30) by crimping the last! "all (5, 6) is connected so that the film strip (1, 23) with a folded Edge and the ends of the flanged frame rails on the same side (3, 4. 20. 30) immersed in the liquid, hardening adhesive standing in the tub of the third Rahmcnleistc (10, 11) and that then with the second folded edge and the fourth Rahmcnleistc (11, 10) accordingly is proceeded. 65 The invention relates to a rectangular filter insert for gas filters, especially for air intake filters from Internal combustion engines, consisting of a porous, concertina-like folded film strip made of filter material, which is enclosed gas-tight in a rectangular frame, with the tight enclosure along the folded edges of the film strip a bond between the film strip and the adjacent frame strips is provided and a method for gas-tight enclosing an accordion-like folded, porous film strip in a frame formed from four frame strips of a rectangular filter insert. In a known filter insert, the foil strip is also glued to the frame strips in question along the unfolded edges. This requires considerable technical effort when enclosing the filter insert in the frame, because the bonding is airtight have to be. It is therefore carried out by pouring liquid adhesive along the relevant edges, and this work process has to be done four times with the known filter, namely once for each frame strip, be carried out, because when pouring the framed strip in question are always held at the bottom got to. These four gluing processes are a hindrance in series production because one gluing orgarg is the first can be carried out when the adhesive from the previous process has hardened. There are i.e. to adhere to waiting times that extremely hinder a rapid series production process. In one known from US Pat. No. 1,787,135 The folded edges as well as the unfolded edges are pinched into the filter insert, and for this purpose, the frame strips, in particular, which extend along the folded edges, are very complicated Way preformed, and this preforming must be precisely matched to the zigzag structure of the insert be, a condition, at least in the production of a mass-produced item that cannot be complied with at an affordable cost. Regardless of this, the seal is Inadequate at the corners despite the considerable effort. It is the task of the invention. the required sealing, especially in the corner areas where the frame rails meet, easy manufacturable and safe to design, and / was so. that they also withstand operational vibrations can. The inventive filter insert is characterized in that for the tight enclosure along one of the smooth edges of the film strip ύ-χ on this adjacent frame strip with a protruding web protrudes into a fold of the film strip and that the ends of this frame strip and its web with the folded along the Edges of the film strip extending frame strips are connected. Instead of the known filter insert mentioned first required four Klcbvorgangsc are with the filter insert according to the invention only two Klcbvorgangsc, namely for the two folded edges. The invention makes the fact take advantage of the fact that there is a fold in contrast to the folded edge without the in this context Adhesion problems that arise in connection with the preliminary publication mentioned above, for example due to a bead, hermetically sealed. It can be also achieve a secure sealing of the corners very easily, as is the subject of claims 2 and 3.