DE4443676A1 - Dust filter assembly insert fan-fold edge for protecting insert against mechanical damage - Google Patents

Abstract

A filter constructed within a housing (3,4) incorporates a filter insert (1) made from a piece of rectangular fan-folded material (10) with two flat surfaces (11,12) one of which receives the oncoming flow, the other releasing the filtered medium. The filter material (10) side edges are encompassed by two longitudinal caps (2) which seal the filter material (10) against the housing (3,4). One or both of the two longitudinal caps (2) project above the filter insert (10), and the over-hang (21) seals one or both flat faces (11,12) of the filter insert (1) against the filter housing (3,4). The novelty is that clamps (5) are located along the face formed between the first and last (10') straight edge fan folds within the housing (3,4). The first and the last folded face (10') is wedged tight to form a seal between the clamps (5) and one opposite face (30) of the filter housing (3,4).

Description

The invention relates to a filter with a filter housing se and a replaceable filter arranged therein element, the filter element consisting of a cuboid gen, from a zigzag folded filter fabric formed filter cloth body with two flat sides, of one of which is the upstream side and one is the downstream side and two edge strips that go through the two the end edges of the sides of the filter fabric surface sealingly attached to the filter material body are, with the edge strips at least on egg ner of the two flat sides of the filter material body over survive this and with their overhang area in the installed condition of the filter element sealing with the Interact filter housing.

A filter of the type mentioned is, for example, out DE 91 16 747 U1 known. About the Merkma cited above le is in this known filter on one Part of the filter housing forming a frame for the fixie tion of the filter element in the area through the first and the last fold surface of the filter fabric body is formed the side surfaces each provided a surface tine, wel cher in the outermost fold of the filter element engages and there the filter fabric in a housing tight seal presses. The disadvantage of this  State of the art considered that there is a perforation of the filter cloth body in the contact area between you tion and flat tines can come because the latter one relatively sharp contour on its the housing-fixed you end facing. About such perforations exclude safely, the material of the filter material body be relatively firm in what the choices are of the filter cloth. Furthermore, this known filter considered a disadvantage that for the Hal The filter element in the filter housing is tensioned frame is required, first with the Filterele ment connected and then locked to the filter housing must become. This requires connecting the tensioner increased attention with the filter element, so that the areas lying at the ends of the tenter frame tines in the correct folds pass spaces of the filter element without the Filter fabric web damage or deform what would lead to leaks. Finally, the In any case, the housing-tight seal required nem high manufacturing cost of the filter, where also the seal a relatively large width and too must have a great flexibility, so the intended sealing function even with regard to From the position of the flat tines, unavoidable ab deviations from the target position and without risk of damage Damage to the filter fabric body met.

DE 42 15 260 C2 also includes a filter element one of the best from a glued foam strip known frame, this foam strip an inner open-pore and an outer closed-pore ge layer and wherein the inner open-pore Layer completely soaked in adhesive and the outer re closed-pore layer is impermeable to adhesive. By means of this frame, the filter element can without Risk of damage to the filter material body in one  Filter housings are held in a sealed manner, however here the disadvantage that the frame in the area of the first and last pleat surface of the filter fabric body-formed side surfaces is relatively compliant, since here the filter material body does not name the frame value opposed mechanical resistance. For this Basically, it can occur in the operation of a filter tendency pressure differences between inflow and outflow te to deformation of the frame and thus to education come from unwanted bypass routes. This is a proper function of the with the filter element equipped filter is not always guaranteed. Except that is the production of this known filter element relatively complex.

Finally, DE 42 15 265 A1 describes a filter element knows, in which a frame from a molded Layer of a mixture of pulp and curable Glue is provided. This filter element is although the frame is easier and cheaper to manufacture cash, but here too the problem remains a serious one Chen danger of the frame giving way in the area of through the first and the last fold surface of the filter fabric given body-formed side surfaces.

It is therefore the task of a filter with a Filter housing and a replaceable arranged in it ren specify filter element, in which the above disadvantages are avoided and in particular the filter material body works well against mechanical damage is protected, even with high pressure differences differences between the upstream and downstream sides desired release of bypass paths is avoided, where the filter housing is simple and with a low Number of individual parts is feasible and at the manufacturer development and replacement of the filter element relatively a are professional and inexpensive. In addition, the Filterele  can be disposed of easily after its period of use his.

This object is achieved in accordance with the invention by a filter of the type mentioned with either characterizing features of claim 1 or al ternatively with the characteristic features of the patent claim 2.

In both filters according to the invention is secure represents that by means of the clamping means a deformation of the Area of through the first and last fold surface of the Filter surfaces formed side surfaces excluded sen, the clamping means is also a mechanical sufficient firm support and the necessary sealing tion of the filter element relative to the filter housing ken. At the same time, the filter material body is in front mechanical damage from parts of the filter housing it is safely protected.

The clamping means can for example by in Klemmrich tensioned or tensionable, selective acting Clamp arms should be formed. Alternatively, the clamps tel by preloaded or tightened in the clamping direction right, in the longitudinal direction of the associated side surfaces of the Filter element running, linear acting clamp profiles.

Depending on the size and design of the Filters, especially the filter housing and the filter insert, either on only two side surfaces or on al len four side surfaces of the filter element are provided his. If only on two side surfaces of the filter element such clamping means are provided, these pages expediently those who are in the area of the first and the last fold surface of the filter fabric body to provide the required security against a Nachge  to ensure the side surfaces during operation of the filter Afford.

It is also proposed that the first and the first last fold surface adjacent clamping means each Support body to support the first or the last Wrinkled surface is arranged on the downstream side. Here through will provide improved support to the the wrinkled areas that further improve offers protection against mechanical damage. The support body can be flat or lattice-shaped or in the form of several comb-like webs, the best possible compromise between sub support area and passage area for the filtered Medium is to be sought. In addition, the support body can each because it is made in one piece with the clamping means or on attached this, e.g. B. glued or welded, his.

For simultaneous fixation and sealing of the filter elements in the filter housing is preferably proposed that the filter housing to accommodate the excess area surface of the edge strips with steps and / or grooves forms, in or on which one is elastic flexible sealant is arranged to the forehead edges and / or at least one side surface of the over stand areas can be pressed on tightly.

In order to securely clamp the overhang areas of the can To ensure tenstreifen, it is provided that the Width of the edge strips the thickness of the filter cloth pers exceeds by 10 to 100%.

For versions of the filter element in which this is verse all four sides with an edge strip hen is before the rationalization of production provided that all four edge strips in one piece  from a single common continuous strip or from several strip sections together butt-connected ends are made. Hereby the four edge strips become a stable one, the fil frame on its four sides men formed for special stability both during storage and transportation as well ensures the use of the filter element.

Except, as mentioned above, on the filter housing and its A sealant can alternatively or additionally share also be provided on the filter element, preferably by with the edge strip at least one in the longitudinal directional, elastic-flexible sealing strip connected, e.g. B. is glued or welded.

Regarding the material and the way of attaching the Edge strips are preferably provided that these a thermoplastic or post-crosslinking plastic exist and that they are glued to the filter material body or welded or injection molded. With the called materials and attachment methods for the edges strip becomes an advantageously simple, preferably car automated production of the filter elements for the inventions suitable filter enables.

Embodiments of the invention are as follows explained using a drawing. The figures of the drawing show:

Fig. 1 shows a first filter element in plan view in a simplified schematic representation,

Fig. 2 shows a detail of the filter element of FIG. 1 installed in a tergehäuse in a partially illustrated Fil state,

Fig. 3 shows a second filter element, also in plan view in simplified schematic depicting lung,

Fig. 4 to Fig. 7 each show a section of the filter element of Fig. 3 in the installed state in differently executed, each partially shown filter housing and

Fig. 8 shows a third embodiment of the filter element in a partial cross section.

As shown in FIG. 1 of the drawing, the first exemplary embodiment of a filter element 1 shown here consists of a filter body 10 which is formed from a zigzag-folded filter fabric web. On the two side surfaces on which the fold front edges lie, ie in the drawing above and below, an edge strip 2 is attached to the filter material body 10 , for. B. by gluing, welding or hosing. The edge strips 2 consist of a thermoplastic or post-crosslinking plastic.

As further seen from Fig. 1, is located on the ie free at the other side surfaces, in the drawing, left and right, the first or last folding face 10 'of the filter material body 10.

Fig. 2 of the drawing shows the filter element 1 of Fig. 1 in a built in a filter housing 3 to stand, both filter housing 3 and filter element 1 are partially shown in cross section. The zigzag shape of the filter material body 10 of the filter element 1 becomes particularly clear here, one of the two edge strips 2 being recognizable in the background. In addition, Fig. 2 shows clearly that the width b of the edge strip 2 is greater than the thickness d of the Fil terstoffkörpers 10th In the lower part in particular, the edge strip 2 projects beyond the filter material body 10 and forms a protruding area 21 there .

On the left edge of Fig. 2 is the first pleated surface 10 ', which is used here for holding and sealing the Filterele element 1 against the filter housing 3 . For this purpose, a clamping means 5 is provided in the filter housing, which is formed here from a clamping profile which can be pivoted in the direction of the arrow marked thereon and which is preloaded in the clamping direction by, for example, a spring arrangement. With its end face 50 located in the upper part, the clamping means 5 presses in the direction of a counter surface 30 of the filter housing 3 . Between the end face 50 of the clamping means 5 and the counter surface 30 of the filter housing 3 , the free end of the first fold surface 10 'is glued to you tend.

In the same way, the last fold face 10 'not shown in FIG. 2' on the opposite end of the filter element sealingly held against the Filterge housing 3 . In the area of the other two sides of the filter element 1 , the sealing is preferably carried out at the protruding areas 21 of the edge strips 2 .

Finally, FIG. 2 shows that the inflow side 11 of the filter element 1 is at the top in the embodiment shown and the outflow side 12 of the filter element 1 is at the bottom.

The illustrated in Fig. 3 of the drawing Ausfüh approximately example of the filter element 1 differs from that of FIG. 1 in that now the left and right side surfaces are each provided with an edge strip 2 '. At the corners of the rectangular filter element 1 in its outline, the edge strips 2 , 2 'meet each other and are expediently connected to one another for stabilization there. Alternatively, all four edges strips 2 , 2 'can also be formed by a single circumferential strip.

FIG. 4 of the drawing shows the filter element 1 according to FIG. 3 in the installed state in a filter housing 3 , both of which are only shown in part in cross section. The filter element again has the zigzag-shaped folded filter material body 10 , fen fen 2 , 2 'bordered by the edges and connected to this sealing. On the left in Fig. 4 side surface of the filter element 1 it can be seen that there the first Faltenflä surface 10 'is flat with its facing surface of the Kan tenstreifens 2 ' is connected.

Here too, the edge strips 2 , 2 'have a width which is greater than the thickness of the filter material body 10 . The protruding areas 21 , 21 'of the edge strips 2 , 2 ' are used to hold and seal the filter element 1 in the filter housing 3 . The filter housing 3 be sits in its area facing the filter insert 1 a step 31 on which the lower end edge of the edge strips 2 , 2 'is placed. By means of the clamp by means of 5 , more precisely by means of its end face 50 , the protruding area 21 'of the edge strip 2 ' is pressed against the counter surface 30 of the filter housing 3 . With a sufficiently high clamping force exerted by the clamping means 5 and when using a somewhat flexible elastic material for the edge strips 2 , 2 ', the required tightness can be achieved without further aids, as shown in FIG. 4.

Fig. 5 of the drawing shows an embodiment in which additional means for sealing are provided. The filter element 1 corresponds fully in its design to that of FIG. 4, so that further explanations are not necessary here.

The filter housing 3 according to Fig. 5 there shall be two Dichtmit, here in the form of sealing profiles 33, 33 'det ausgebil, wherein the first sealing means 33 in the area of the step 31 between the latter and the lower end edge of the Kan tenstreifens 2' is located. In the upper part of Fig. 5, a second filter housing part 4 can be seen , which rests on the upper edge of the edge strip 2 'and acts on it with a downward force. Here by the edge strip 2 'is pressed in sealing contact with the sealant 33 .

At the same time here again the clamping means 5 are effective, which by means of the end face 50 press the protruding area 21 'of the edge strip 2 ' against the counter surface 30 of the fil tergehäuses 3 . In this counter surface 30 , a groove is recessed, in which the second sealant 33 'is placed, it protrudes in the unloaded state over the Ge genfläche 30 , so that it presses against it when it protrudes 21 '.

In the example shown in Fig. 6 embodiment ent of the filter element 1 and the filter housing 3 is essentially the execution of talking as shown in FIG. 4, wherein the Un difference lies in the fact that in the example of Fig. 6, the clamping means 5 with an additional integrally been executed Support body 52 is provided. This support body 52 extends from the actual clamping means 5 upwards into the first fold space of the filter material body 10 and supports there the first exposed, flowed through medium to be filtered Fal tenfläche 10 '' of the filter material body 10 on the outflow side 12th The absolutely counted first fold surface 10 'of the filter material body 10 is again flat with the inside, that is, in FIG. 6 pointing to the right the side of the edge strip 2 '.

Fig. 7 of the drawing shows an embodiment in which the filter housing 3 is guided with a groove 32 for receiving the protruding area 21 'of the edge strip 2 '. On the bottom of the groove, a sealant 33 is arranged, to which the overhang region 21 'can be pressed by means of a second filter housing part 4 from above. The filter element 1 corresponds here to the embodiment previously described with reference to FIGS. 4 to 6.

Fig. 8 of the drawing finally shows a Filterele element 1 , in the outside on the edge strips 2 , 2 'circumferentially attached a sealing strip 22 made of an elastic-flexi ble material, for. B. is glued or welded or molded. This sealing strip 22 also serves to seal the filter element 1 in its state installed in a filter housing 3 , 4 , the principle of operation corresponding to that of the sealing means 33 ', as described in FIG. 5.

Claims (10)

1. Filter with a filter housing ( 3 , 4 ) and an interchangeable filter element ( 1 ) arranged therein, the filter element ( 1 ) being made of a cuboidal filter material body ( 10 ) formed from a zigzag-shaped filter material web with two flat sides ( 11 , 12 ), one of which is the leading side and one is the downstream side, and of two edge strips ( 2 ) which are sealingly attached to the filter material body ( 10 ) on the two side surfaces formed by the end edges of the filter material web, the Edge strips ( 2 ) protrude at least on one of the two flat sides ( 11 , 12 ) of the filter material body ( 10 ) and with their protruding area ( 21 ) in the built-in state of the filter element ( 1 ) sealingly with the filter housing ( 3 , 4 ) cooperate, characterized in that in the area formed by the first and the last fold surface ( 10 ') of the filter material body ( 10 ) side surfaces in the Filter housing ( 3 , 4 ) clamping means ( 5 ) are provided and that between the clamping means ( 5 ) and one counter surface ( 30 ) of the filter housing ( 3 , 4 ) the first and the last Fal tenfläche ( 10 ') can be directly sealed . 2. Filter according to the preamble of claim 1, characterized in that on the by the first and the last Faltenflä surface ( 10 ') of the filter material body ( 10 ) Be tenflächen each have another edge strip ( 2 ') is introduced that in Area of these side surfaces in the filter housing ( 3 , 4 ) clamping means ( 5 ) are provided and that between the clamping means ( 5 ) and a respective ge surface ( 30 ) of the filter housing ( 3 , 4 ) the two other edge strips ( 2 ') can be sealed . 3. Filter according to claim 1 or 2, characterized in that the clamping means ( 5 ) are formed by biased or clamped in the clamping direction, punctually acting clamping arms. 4. Filter according to claim 1 or 2, characterized in that the clamping means ( 5 ) by biased in the clamping direction or tensile, in the longitudinal direction of the associated side surface of the filter element ( 1 ) ver running, linear acting clamping profiles are formed. 5. Filter according to one of claims 1 to 4, characterized in that on the first and the last pleated surface ( 10 ') adjacent clamping means ( 5 ) each have a support body ( 52 ) for supporting the first or the last of the filtering Medium flowed fold surface ( 10 ', 10 '') is arranged on the downstream side. 6. Filter according to any one of claims 1 to 5, characterized in that the filter housing ( 3 , 4 ) to close to the protruding areas ( 21 , 21 ') of the edges ( 2 , 2 ') with steps ( 31 ) and / or grooves ( 32 ) is formed, in or on which in each case an elastic flexible sealing means ( 33 ) is arranged, to which the end edges and / or at least one side surface of the protruding areas ( 21 , 21 ') is / can be pressed in a sealing manner . 7. Filter according to one of claims 1 to 6, characterized in that the width (b) of the edge strips ( 2 , 2 ') exceeds the thickness (d) of the filter material body ( 10 ) by 10 to 100%. 8. Filter according to one of claims 2 to 7, characterized in that all four edge strips ( 2 , 2 ') are made in one piece from a single common pass through the strip or from several strip sections with abutting ends Herge provides. 9. Filter according to one of claims 1 to 8, characterized in that with the edge strips ( 2 , 2 ') min least one in the longitudinal direction extending, flexible flexible sealing strip ( 22 ) is connected. 10. Filter according to one of claims 1 to 9, characterized in that the edge strips ( 2 , 2 ') consist of egg nem thermoplastic or post-crosslinking plastic and that they are glued or welded or molded onto the filter material body ( 10 ).