DE2311511A1 - LIQUID FILTER - Google Patents

Description

dr. MÜLLER-BORE DIPL.-PKVS. Dn. MAM (TZ oipl-chem. Dr. DEUFEL DlPL-ING. FINOTENWALD D1PL-IN3. GRÄMKOW

PATENT LAWYERS 2311511

Munich, the 8th KK. 1973

Hl / Sv - G 2310

GENERAL MOTORS LIMITED

Iir; _t.-tu, Dunatc.bie, 3e England

Liquid filter

The invention relates to a liquid filter.

A liquid filter according to the invention, which in particular for filtering the oil of an internal combustion engine lubricant system is suitable includes a cylindrical housing, whose open end is closed by a plate with a central, inwardly directed and internally threaded provided outlet neck or outlet approach is closed, and a filter element which is arranged in the housing, so that opposite sides of the element with the central outlet extension or a plurality of inlet openings arranged around this and which comprises a strip of sheet filter material around a row

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" ² " 23T1511

of cross fold lines to form a series of accordion-I pleats is folded, with the ends of each of the fold layers sealed separately from those of adjacent fold layers are so that the pleated layers are provided in a series of pockets or cells in the form of a panel or plate at one end of which the open ends of the cells are located, and wherein the open ends enclosed by circumferential sections of the plate surface which are tightly connected to a tight circumferential frame which is integrally formed with a funnel member and extends around its opening, which is a Has outlet tube which fits around the outlet neck in a snug fit and is tightly connected thereto, while a perforated Support member extends across the frame and supports the open ends of the cells.

The funnel member can be made of metal or as a plastic molding or compact be provided with a right-angled opening, the frame section being "L" -shaped in cross section to aid in locating the element therein and as a retainer for an adhesive to serve with the peripheral portion of the filter panel or the filter panel is tightly connected to the frame around the perforated support. Ribs can on that Frame and support member attached to or integrally cast therewith so that they extend therefrom and one each into at least the end cells of the pleated filter element occurs to continue to support the localization of the element. A check valve with a one outer circumferential flange having tubular sleeve can be arranged around the outlet tube of the funnel-shaped member in the passageway with the flange overlying the inlet openings and elastically engaging the surface of the plate around it.

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The funnel member is advantageously designed so that, when inserted into the housing, it is located in the wall of the housing, but at a distance therefrom is arranged.

The funnel member may have one or more molded passages which provide a connection between opposite sides of the filter element and a spring-loaded one Check valve assembly included, which when the pressure drop across the filter element is a predetermined Value, allows a direct flow of the liquid between the inlet and outlet openings by forms a bypass to the filter element.

The term "old" or "pleat layer ¹¹ is used to denote the structure formed by folding a strip of material around itself, the strip of material thereby being formed into two sections (the two halves of a pleat layer) that are integral and are hinged at a fold line (or bead or kink) between them.

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

Fig. 1 is a sectional elevation of a preferred embodiment of a filter according to the invention,

2 shows a plan view of the embodiment shown in FIG. 1, FIG. 3 shows a section along line HI-III in FIG. 1, FIG. 4 shows a plan view of part of a layered filter paper strip which is used to form the filter paper strip shown in is used. 1 to shown the filter element, Fig. 5 shows a section along line 5-5 in Figure 4, Fig. 6 shows a section along line 6-6 in Fig. M- and Figs. 7 and 8 is a sectional detail elevation view respectively Figure 13 is a bottom plan view of a modification of the holding or funnel member shown in Figures 1 to 4. 309838/0946

According to Fig. 1 comprises a cylindrical, cup-shaped or pot-shaped housing 1 made of pressed sheet metal, whose open end is closed by a relatively thick end plate or face plate 2, which with a central, after inwardly directed and internally threaded outlet neck or outlet extension 3 is provided, with on the circumference the plate 2, for example by welding, an annular channel member or U-profile 4 made of relatively thin Metal sheet is fixed, which is rolled at its outer periphery to the end of the cylindrical housing 1 by a or rolled seam seal 5 is attached. An annular sealing washer 6 is in the annular U-profile 4 held back.

In the housing 1, a filter element 7 is arranged, the one Strips of sheet or layer filter material 8 (Fig. 4), preferably made of synthetic resin impregnated filter paper which is folded in a zigzag shape around a series of transverse fold lines 9 is to create a series of accordion folds or pleats 10, with the ends of each of the pleated layers sealed separately from those of adjacent pleated plies are by means of adhesive lines or adhesive lines 11, which on an area of the strip in the region of each longitudinal edge of ' this are applied.

Spacer formations are pressed into the strip 8, which are advantageously substantially rectangular in shape / Lm Depressions or hubs are provided, the preferred embodiment shown in FIG. 3 extending in the longitudinal direction extending rows of spacer indentations spaced across the width of the strip are arranged and between which two further, longitudinally extending rows of spacer recesses 14 are provided, "with the spacer indentations 12 pressed into the side of the strip which

3098 3 87 09 4 6

opposite to that of the depressions 14 ·, as shown in FIG the pig. 5 and 6 is shown. When the strip 8 is folded to form the series of pleat layers 10, butt the spacer indentations 14 of adjacent fold layers against one another or lie against one another, around each To keep the pleat layer from an adjacent layer at a distance, and the spacer indentations 12 on one half of each Pleat layers lie against those of the other half of this, so that the two halves of each pleat layer are apart be kept at a distance, as shown in FIG.

As shown in FIGS. 5 and 6, successive fold lines 9 have an alternating ¹¹ W "and a ^U M" cross-section, so that the fold lines 9 "when the strip 8 is folded are essentially rectangular," U "-shaped beads at the connection points between adjacent fold layers 10 and at the connection points between two parts of each fold layer, the right-angled formation of the beads a precise spacing of the or a precise distance between the fold layers and their parts by the spacer recesses 12, 14 · facilitated or made possible.

After the strip 8 has been folded around the transverse fold lines 9 is, the arrangement of pleated layers 10 is in the form of a right-angled panel & s Plate, the fold layers with their sealed ends forming a series of pockets or cells, the open ends of which are on a flat surface of the plate. Lengths or elongated pieces of the folded strip are cut away, to form filter elements 7 which, as shown in FIGS. 1 and 3, are square or square in the Cut, whereby the depth of the fold layers (as determined by the distance between the fold lines) is chosen so that the elements fit in a suitable manner in a sleeve of predetermined length,

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231 rs 11

To hold the filter element 7 in the housing 1 is it is attached to a retaining or holding or funnel member 16, which solder provided as a sheet metal compact, the further or wider end of which is designed as a flat, square frame section 17, with a flange or rim portion or edge portion 18 extends normal to this from its outer circumference. The funnel limb comprises between the frame section 17 and his ■ at the other end a shouldered portion 19 having a circular cross-section and having a inwardly rotated bent flange 20 is provided, which is press fit or otherwise over the inwardly rotated Outlet extension 3 is secured, with a sealing ring 13 or a layer of sealing material between the flange 20 and the face plate 2 is inserted.

In the area of two opposite edges of the frame section 17 two L-shaped ribs 21 made of metal are attached, the project at right angles to the frame section 17 and can engage in the open ends of the cell or pockets formed by the two end pleat layers 10 of the filter element 7, whereby the ribs 21 locate the filter element symmetrically in the edge 18 of the funnel member 16. The filter member 7 is on the frame member 17 of the funnel member 16 by adhesive, as shown at 22 and sealed in position thereto. .

Between the frame section 17 of the funnel member 16 and the Open ends of the cells formed by the pleated layers 10, a perforated support screen 23 is used, which the pleated layers in the area of the openings of the cells formed by them.

If desired, the filter can be provided with a check valve 25 be provided as a hollow cylindrical sleeve member formed from synthetic rubber or similar material

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and between its ends has a radially extending annular flange 26 which is normally a plurality superimposed by inlet openings 27, which are formed in the face plate 2 and around the outlet extension 3 therein evenly Are spaced, the outer periphery of the flange 26 normally to an annular portion of the end plate 2, the extends around the inlet openings 27, engages elastically.

The filter shown is particularly useful as an oil filter for Suitable for internal combustion engines and, in use, is attached to a mounting surface of an internal combustion engine, wherein the outlet lug 3 is screwed onto a spigot on the mounting surface so that the sealing ring 6 forms a seal therebetween and the inlet openings 27 in communication with one or more lubricant outlet openings on the mounting surface will be contacted. The pressure of the oil to be filtered causes the flange 26 of the check valve to become bent away, the oil then passing from the outside to the inside of the pleated layers 10 and the filtered oil to the Engine lubricant system is returned through the outlet extension 3.

The spacer recesses 12, 14 ensure a uniform distance or space between the pleat layers, so that a uniform bed or a uniform Layer of filtered out solids on the filter element can form, which ensures that the surface available for filtering is optimally used will; the depressions also provide effective drainage channels between the pleated layers of the element.

It has been found that when using the element described with a rectangular plate shape, the same filter paper area, like the one used in a known tubular oil filter element received in the same filter housing size.

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men and that the construction is simpler and requires fewer parts than a known hollow tubular one Filter element, as it dispenses with the usual face plates and the support tube of a tubular element.

Although in the embodiment described above The funnel member and the sieve are made of sheet metal, they can be made of plastic and in the same way In such a case, the perforated screen 23 and the support ^ pen 21 can be integral with the funnel member 16 cast. Such an embodiment is shown in FIGS. 7 and 8, in which the funnel member as a plastic molding or casting 16 'is provided and instead of the perforated support screen 23 and the ribs 21, w ^ .e it is shown in FIGS. 1 to 3, a plurality of struts 30 and two ribs 31 with gaps between the struts 30, so that the ends of the struts the fold layers 10 wear tew. support, but allow a free flow of filtered liquid from the openings of the pleat cells to the outlet extension 3, on which the cast funnel member 16 'is placed in a press-fit fit or in a snap-fit fit. This embodiment simplifies the manufacture and assembly of the filter even more, since it uses the separate metal support screen 23 eliminated.

- patent claims -

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Claims (6)

Patent claims Liquid filter with a cylindrical, cup-shaped Housing, the open end of which is closed by a plate, which has a central, inwardly directed and having internally threaded outlet boss, and with a filter element disposed in the housing, so that opposite sides of the element with the central outlet extension or a plurality of arranged around this Inlet ports communicating, and which comprises a strip of sheet filter material extending around a series of Cross fold lines are folded to form a series of accordion pleats with the ends of each pleat separated from those of adjacent pleated layers are sealed and thereby the pleated layers into a number of cells are shaped and wherein the fold layers are arranged in the form of a panel or a plate, on its or their a flat surface provided the open ends of the cells are, characterized in that the open ends through circumferential sections of the panel or Plate surface are enclosed, which are attached to an impermeable perimeter frame (17) sealed integrally is provided with a funnel member (16) and extends around its opening, which has an outlet pipe (19 »20), which is arranged in a snug fit around the outlet extension (3) and is tightly connected to it, and that a perforated Support member (23) extends across the frame and supports the open ends of the cells (10). 2. Liquid filter according to claim 1, characterized in that the filter element (7) in cross section is substantially square and that the frame (17) is substantially square in shape. 309838/0946 2314511 3 · Liquid filter according to claim 1 or 2 _? characterized in that the funnel member is seen as a plastic molding (16 *) and that the support member (23) is molded integrally therewith and a plurality of ribs (30, 31 ), the free edges of which bear against the open ends of the pleated layer cells, the ribs (30) having spaces between them for a free flow of filtered liquid from the cells to the outlet attachment (3). 4-. Liquid filter according to any one of claims 1 to 3 _5, characterized in that a check valve is inserted between the plate and the funnel member, that the valve is made of elastomeric material and comprises a tubular sleeve (25), the opposite ends of which are in tight contact with the Plate (2) around the outlet attachment (3) ba ?. stand with the funnel member (16) around the outlet tube, and that the sleeve has between its ends an integral annular flange (26) which extends over the inlet openings (27) and the outer peripheral portion of which with the plate radially outside the inlet openings in an elastic, more tight manner Touch stands. 5. Liquid filter according to one of claims 1 to 4, characterized in that there is provided a pair of ribs (21) normal to the Frames extend at opposite peripheral portions thereof and into opposite end lines, respectively grip the filter element (7) to locate the element on the frame. 309838/0946 6. Liquid filter according to one of claims 1 to 5 »characterized in that alternating fold lines in the longitudinal direction of the strip (8) in cross section" W "- and" M ^lf shape and that in the strip from opposite sides of this two groups of Spacer formations (12, 14) are indented so that when the strip is folded about its fold lines, the creases or kinks formed between adjacent fold layers (10) and the two halves of each fold layer have a substantially rectangular shape and the fold layers and the two halves of each pleat are uniformly spaced from one another. 309838/0946