DE2311854A1 - FLUID FILTER ARRANGEMENT - Google Patents

Description

The invention relates to a filter arrangement for filtering fluids and in particular relates to a filter arrangement, which is intended for filtering liquids and in which the filter element consists of a strip is formed from sheet filter material which is folded in a zigzag manner about that of a filter element to reduce the space occupied with a relatively large area or a relatively large area. The inventive Filter arrangement '. Is particularly for use in the Filtering the oil in internal combustion engine lubricating systems is suitable, but it is also suitable for filtering others Suitable for liquids and gases.

P 43 7 //. SSV,

309838/0973

Dr. Müller-Bor * Or. Manitz · Dr. Deufel Dlpl.-Ing. Fintterwald Dlpl.-Ing. Gramkov

33Bra <H "cftw" le, Am BOrgarpark I 8 Munich 22, Robert-Koch-Str ·! · 1 7 Stuttgart-Bad Cannetatt, MarktatraBe

Telephone {0631) 73117 Telephone (OiII) 2936 «, Telex 5-22060 mbpat Telephone» 711) 587261 Bank: Zentralkaeee Bayer. Volktbanken, Munich, account number S822 Poetecheck: Munich 96 «6

In the description, the term "folded position" is used to denote ~ to denote the structure made by folding a strip of material is formed around itself, wherein the strip of material is thereby formed in two sections that are attached to one Fold line (or a bead) between them are integrally and articulated.

It is known to make an oil filter element from a strip filter paper impregnated with synthetic resin or the same sheet or Layers of filter material to form the order in the transverse direction spaced-apart fold lines are folded to form a plurality of accordion folds or folds, wherein the ends of the strip are tied together and then the arrangement of folded layers over a perforated central tube is fitted to form a hollow tubular filter element in which the pleated sheets are star-shaped from the perforated one Center tube are directed outwards. In such elements, the ends of the folded layers can be individually sealed or be tightly connected or each end of the folded sheets provided arrangement can be tightly attached to annular end caps.

It is also known to have spacer pits or to form other spacer formations around the pleats and the two halves of each pleat from each other to be spaced apart, and the fold lines to be formed in such a way that the creases produced when the strip is folded have a substantially rectangular "U" shape; and are widened on the inner circumference of the element in the region of each end of the fold lines between adjacent fold layers, an exact spacing between the folded layers on the to facilitate the inner circumference of the element.

The object of the invention is to simplify the manufacture and assembly of such filter arrangements or filter elements and the spacing and support of the folded layers and the

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To improve parts of these.

This is achieved according to the invention in that the spacing and the support on the outer periphery of the element is improved by the strip to be laid in pleated layers is constructed and arranged so that the wider portions of the ends of the fold lines are on the outer perimeter of the finished Element.

As a result, a filter arrangement according to the invention comprises a filter element which is formed from a strip of filter paper impregnated with synthetic resin in a hollow cylindrical shape, which is folded in accordion fashion around a series of parallel, regularly spaced transverse fold lines and connected at its ends is used to form a series of accordion folds or pleats, the kinks or beading between the two parts of each pleat and the creases between adjacent pleats each have a substantially right-angled U ^M shape in cross-section and through double fold lines which are alternately "W" and "M" -shaped in cross-section, and alternating fold lines in the area of opposite longitudinal edges of the strip have an enlarged width in order to form wider bead sections at this point; in which two halves of each fold position are Spacer formations pressed in, which are attached to each other to keep the two halves of each fold on the side of the paper forming the outer peripheral surface of the element spaced apart, and the two halves have further spacer formations which abut one another around the two halves of each fold on the Side of the paper, which forms the inner peripheral surface of the element, to be kept at a distance from each other, wherein the depth of the spacer formations and the width of the corrugations formed in the folding layers are chosen so that when the wider corrugation sections on the outer periphery of the element lie against each other, due to the distance between the folded layers

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, ORIGINAL INSPgQTEO

on and between the inner and outer peripheries of the element and by the distance between the two halves of each position arranges the pleats in a substantially uniform radial arrangement about the longitudinal axis of the element are; the filter assembly according to the invention further comprises a perforated central tube over which the element is fitted with the radially inner beads of the pleats abutting the tube, and a pair of annular end caps, each attached by adhesive to the opposite ends of the element to the opposite ends To seal ends of the pleats, with the inner peripheral portions of the end caps at the opposite ends of the Central tube attached and tightly connected to these.

The invention is illustrated below with reference to the drawing, for example described; in this shows:

Figure 1 is a top plan view of a portion of a strip of FIG Sheet filter material, in the fold lines and spacer formations according to a preferred one Embodiment of the invention are pressed in,

FIG. 2 is an enlarged sectional view on "line 2-2 in FIG. 1, Fig. 3 is an enlarged sectional view on line 3-3 in Fig. 1,

FIG. 4 is an enlarged perspective view of the one shown in FIG. 1 strip shown, the strip being partially folded to form a substantially rectangular U-shape To form kinks or beads,

5 is an enlarged perspective view of part ■ a filter element, which is shown from the Λ 'strips made in Fig., Wherein the folded layers are not sealed at their ends and sealed to FIG.

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6 is a view similar to FIG. 5, but in which the ends the folded layers are individually sealed or tightly connected,

FIG. 7 is an elevation, partially in section, of a filter made from the strip shown in FIG is,

Fig. 8 is an assembled top plan view, partially in section, of the filter in Fig. 7 in which the filter end cap is partially cut away to show the formation of the folded sheets with both sealed and tightly connected as well as with unsealed or unsealed ends to show,

FIG. 9 is an enlarged sectional view on line 9-9 in FIG. 7j FIG. 10 is an enlarged sectional view on line 10-10 in FIG.

11 shows an enlarged detailed view of an edge section the strip of layered filter material with a modified embodiment of the fold lines,

Figure 12 is a side elevation of the strip shown in Figure 11;

Fig. 13 is a detailed end view one of the one in Figs. 11 and 11 12 penalties shown.

In Fig. 1, a section of a strip 1 of synthetic resin-impregnated filter paper is shown, in which, as shown in the Fig.1 to 6 is shown a series of parallel, regular with Abstarä. arranged transverse double fold lines 2 impressed to form a group of accordion folds 3.

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As. As shown in Fig. 3, alternating double fold lines 2 ene generally "W" and "M" shapes in cross-section, the arrangement being such that when folded, as shown in FIG. 5 »6, 9 and 10, which have a substantially rectangular u-shape in cross section between the two parts of each fold sheet and beads formed between adjacent fold sheets. In addition, as it is especially in the S ¹ Ig. ί, 5 and is shown, each alternating double fold line 2 widened in the region of the longitudinal edges of the penalty 1 to form wider Sieken sections 5 at this point, which when the strip is folded to form the folds 3, a predetermined Provide spacing between the ends of the folded layers 3, which lie on the outer periphery of the element. If it is desired and if the fold layers are relatively long compared to their width, the fold lines 2 can have one or more additional wider bead sections 5 between the opposite ends of the fold lines (see FIG. 7).

Spacer formations are also pressed into the strip 1, comprising spacer ribs or spacer webs 6 and spacer bars 7, the webs being pressed in from the side of the strip which is opposite to that of the spacer bars 7 . The spacer bars 6 and the spacer bars 7 extend in the longitudinal direction of the strip over essentially the full width of each half of a folded layer and the spacer bars alternate with the spacer bars 7 across the width of the strip 1 and are arranged parallel at a distance from these, whereby the bars 7 ^and the webs 6 in one half of the folded position are aligned in the longitudinal direction with those in the other half »

Mach Fig. 3, the spacer rods 7 are "shaped so that they have a stepped or increasing depth from one end to the other, with the deeper portion of the sta-

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bes in the region of the part of each half of a folded layer 3 is provided which lies on the outer peripheral part of the folded element 10 (Fig. 7) A spacer bar 7 rests on one half of a folded sheet 3 on a corresponding spacer bar on the adjacent half of a folded layer ensures that the outer sections of the two halves of a folded layer, which form a tab that is open to the "dirt" side of the element 10, on the outer periphery of the element are spaced at a greater distance from one another than on the inner periphery of the element; and the spacer bars 6 see a gap between the two halves of each fold on the other side (the "clean" Side) of the elements ^ "The spacer bars 6 are with of uniform depth, but they may also be graduated in depth if necessary. The terms

"Dirt ¹ * - or -

"clean" side and / 'dirt ^ side refer to the surfaces of the filter element that corresponds to the filtered or unfiltered Liquid are directed, the liquid flow from the outside to the inside of the element.

After the fold lines 2 and the spacer formations 6, 7 have been pressed into the strip 1, it is folded in a zigzag manner around the fold lines 2 and connected at its ends to make the filter element 10 (FIGS. 7 ^and 8) more hollow tubular shape which is then formed into a filter assembly by fitting it over a perforated central tube 11 to which annular end caps 12 are attached, the end caps carrying an annular mass of adhesive 14 through which the end caps are attached to the ends of the Element 10 are tightly connected and the open ends of the folded layers 3 are closed to form a series of pockets or cells that alternate with

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the outer and inner periphery of the element are open.

According to Fig. 1, the ends of each of the folded layers 3 can be desired tenf al Is individually sealed or tightly connected by means of adhesive lines or adhesive cords 16, the along opposite longitudinal edges of the strip 1 on the side thereof which is the outer peripheral surface of the element, whereby the end portions of each of the two halves of each ITaI ti age 3 be tightly joined together when the strip 1 is folded and the element is then sealed to end caps 12 with adhesive 14 as described above is. In Figs. 5 and "6 are sections of a filter element 10, in which the ends of the folding layers 3 are initially not tightly connected or not sealed or are individually sealed or individually tightly connected.

As can be seen from FIGS. 4 to 6, 9 and 10, when the pleated layer strip 1 is folded to form the filter element 10, by placing adjacent wider ones Spacer sections 5 at opposite ends of fold lines 2 (and in between, if provided) between adjacent halves of the folded layers 3 ensures that the ends of the folded layers on the outer circumference of the element inevitably and uniformly in the circumferential direction .with a predetermined distance are arranged by the width of the spacer sections 5 of the double fold lines is determined. As shown in Figs. 9 and 10, the abutment of the spacer bars 7 between the two Halves of a folded sheet that have a cell on the "dirt" side of the element, ensures that the halves of the folded sheet are spaced apart and on the outer one The circumference of the element is further spaced apart from one another.

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are arranged as on the inner circumference of the element; and the spacer bars 6 ensure that on the "clean" Side of the element, the two halves of a folded layer apart spaced to provide adequate passage for the flow of filtered liquid.

The dimensions or dimensions of the spacer sections 5 » the spacer bars 6 and the spacer bars 7 are chosen so that for a filter element with a predetermined inner diameter and outer diameter of the cooperation the spacer sections 5, the right-angled, U-shaped beads provided by the double fold lines, the spacer webs 6 and the spacer rods 7 were provided from leads to a folded layer formation and arrangement that the folded layers 3 around the element from each other with a predetermined minimal spacing and are arranged in such a way that the fold sheets are substantially uniform are arranged radially with respect to the axis of the hollow tubular element.

According to FIGS. 11, 12 and 13, when the ends of the folds individually sealed or tightly connected with adhesive, the fold lines 2, which the beads of the folded layers 3 form in the area of the inner peripheral portion of the element, Be single fold lines across the section of double fold line 2, which is covered by the adhesive 6, such an arrangement the formation of a tight fold and good adhesion between two! Bearings of each half of a fold at its section in the area of the inner circumference of the element.

A filter arrangement according to the invention offers 5 due to the wider folding line spacer section provided precise spacing and that by the spacer formations 6, 7 provided for the folded layers

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Support an effective use of the entire area or the entire surface of the filter paper and very largely reduced inclination for damage to the folded layers under the pressure of the liquid to be filtered, especially when the filter paper by the effects of aging and heat is brittle. A filter arrangement according to the invention is easy to manufacture because it is applied after the paper has been folded the spacer formations 5 are brought into abutment with one another by pressure in the longitudinal direction and this together with the action of the spacer formations 6, 7, the folded layer 3 automatically forms the desired arrangement, when the ends of the folded strip 1 are connected and tightly connected.

Although in connection with the preferred embodiment of Invention, the spacer formations are described in the form of webs and rods, other formations, for example rows of pits or recesses with suitable variation in depth as required will.

- patent claims -

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Claims (2)

Claims -S ¹ IIt he arrangement with a filter element, which is formed from a strip of filter paper impregnated with synthetic resin in a hollow cylindrical shape, which is folded in accordion fashion around a series of parallel, regularly spaced transverse fold lines and connected at its ends to form a row of accordion folds, the kinks or beads between the two parts of each fold and the beads between adjacent folds each having a substantially right-angled "U" shape in cross section and formed by double fold lines which are alternately ¹¹ W "and" M ^M -shaped in cross section, alternating fold lines in the area of opposite longitudinal edges of the strip have an enlarged width to form wider bead sections at this point, in the two halves of each fold layer spacer formations are pressed that lie against each other and thereby the two halves of each folded layer on side d it keeps paper, which forms the outer peripheral surface of the element, at a distance from each other and wherein the two halves have further spacer formations which abut each other and thereby the two halves of each fold on the side of the paper which the inner circumference as he area of the Element forms, spaced from each other, with a perforated central tube, over which the element is arranged in a snug fit, wherein the radially inner beads of the pleated layers rest against the tube, and with a pair of annular end caps, which are each with adhesive at the opposite ends of the element are fastened and tightly connect or seal the opposite ends of the folded layers, the inner circumferential sections of the end caps being fastened and tightly connected to the opposite ends of the Plittelrohr, 309838/0973 characterized by the fact that the wider Bead sections (5) lie on the outer periphery of the element (10) and that the depth of the spacer formations (6, 7) and the width of the beads (2) in the folded layers (5) are designed so that, if the wider bead sections (5) rest against one another at the circumference, due to the distance between the folded layers (3) at and between the inner and outer peripheries of the element and through the distance between the two halves each Folded position the folded layers in a substantially uniform, radial arrangement are located around the longitudinal axis of the element (10). 2. Filter arrangement according to Incentives 1, characterized in that the opposite ends of each the folded layers (3) are sealed separately from adjacent folded layers individually by adhesive (16) which is applied to each longitudinal edge section of the strip (1) on its side which forms the outer peripheral surface of the element (10), applied is. 3 filter arrangement according to claim 1, g e k e η η ζ e i c h net, due to additional wider bead sections (5) in the fold lines (2) between the wider sock sections (5) at the ends of the fold lines. 4-, conductor arrangement according to claim 1, characterized in that the spacer formations in the Form of ribs or webs (6) and right-angled bars (7) are provided, which are pressed into the strip (1), that the spacer bars and spacer bars alternate across the width of the strip and that each Spacer rod in depth from one end to the other of the rod is graduated or gradually increases, so that 309838/0973 the two halves of each fold on the "dirt" side of the element on the outer circumference of the element are spaced further apart than on the inner circumference of the element. 309838/0973 L e r s e i t e