DE1611157A1 - Filter cartridge and method of making the same - Google Patents

Description

DR. ING. HANS LICHTI -PATENTANWALT -iß ^ <j 5.7

KARLSRUHE-DURLACH 'GRÖTZINGER STRASSE 61

TELEPHONE 4 U 24

October 24, 1967 1599/67

Tecalemit (Engineering) Limited, Plymouth, Devon,

England

Filter cartridge and method of making the same.

The invention relates to a filter for flowing media as used to filter liquids of various kinds, especially those used in such filters Inserts and a method for their manufacture. The invention is particularly applicable to filters for Filtration of fuels and lubricating oils in internal combustion engines, as will be described later * Also the invention can be applied to filters with other tasks »a * B · to those for filtering hydraulic Liquids in hydraulic systems, or from I / uft or other gases »

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In general, liquid filters consist of an outer housing or chamber into which the filter insert is used in such a way that the medium to be filtered flows through the filter material present in the filter insert. Of the Insert consists of a body made of filter material, such as e.g. paper which is folded so that it forms a large surface and which is spiral, cylindrical or can be designed differently, so that the filter insert can be easily inserted into the housing.

In addition to the filter material body, the filter insert one or more parts, which are connected to the filter material and serve, for example, a Reaching over part of the surface of the filter element To form the conclusion, so that the liquid to be filtered. ability is given a guide when passing through the filter insert, or a connector through which the filter insert the filter housing or the filter chamber is connected to represent.

In such filter cartridges, the body of filter material is usually held in an elongated shape and in In this case, the part connected to the filter material body is attached to one end thereof as an end cap, or

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two such parts can be attached to the opposite Ends of the body made of filter material as end caps * - be good.

The present invention now relates to a new specially designed filter insert of the type mentioned and a method of manufacturing this filter element.

According to the invention is a method for producing Filter cartridges are provided with a body made of filter material is molded and attached to a part of this body a certain amount of a polyurethane resin mixture which hardens and thereby results in a part adhering to the filter material body.

This part made of polyurethane resin that forms when it hardens can generally be referred to as a solid body, however, the hardened resin mixture has a high degree of May have elasticity, which optionally represents a particular advantage of the filter insert according to the invention.

When carrying out the method according to the invention the filter material usually into an elongated body

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molded and forming a certain amount of the polyurethane resin Mixture is attached to at least one end of this body so that an end cap is formed as the mixture hardens for the filter insert.

In a filter insert made according to the invention, the end cap normally represents a closure, which closes the gaps between the individual sections of the filter material body to ensure proper Ensure passage of the fluids through the latter. It can be, for example, end caps for filter inserts act that belong to the cylindrical or star-shaped folded type, or also to close off gaps between the inner and outer ends of the folds of the filter cartridges, in which the folds of the filter cartridge are arranged so that these folds radially extend outward from the center of the filter element.

The invention is therefore particularly advantageous for filter cartridges of oil filters including the type intended for use on internal combustion engines and are constructed in which the folded into a spiral or cylindrical body of circular "cross-section Filter material held between two end caps

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is, as well as for filter cartridges of the radially pleated Type - as mentioned above - in which the pleated filter material represents a body with a circular cross-section, its folds radially between an inner tube and an outer tube or an outer sleeve extend against which the inner and outer edges of the folds abut.

Certain polyurethane resin mixtures are in accordance with the invention used, which consist of two components that react with each other after mixing and thereby form a hardened mass. It has been found that certain blends of these types of resins have such properties in terms of hardness, elasticity and resistance to lubricating oils, fuels and solutions, as they are for the desired purposes are required *

Certain mixtures of this type consist of propylene oxide polymers and an aromatic polyisocyanate hardener, e.g., polymethylene polyphenyl isocyanate or diisocyanate diaryl methane.

Propylene oxide polymers can be prepared in several ways be, for example «B« through the polymerization of propylene

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Oxide in the presence of propylene glycol as an initiator and an alkaline catalyst, or by polymerization of propylene oxide using trimethylolpropane or Glycerine as an initiator.

When a propylene oxide polymer and a hardener of the above kind are mixed, an exothermic reaction occurs triggered, the result of which is an automatically hardening mass that can be deformed without external heat »In some In some cases, however, it can be advantageous to use additional external heat in order to harden the mass more quickly bring, it also being possible to use a catalyst in addition to or instead of external heat.

resin The ingredients of a useful polyurethane mixture

are called "Aptane 14q, Parts A and B" by supplied by Crispin Chemical Company Limited.

As a component of another usable mixtures, polypropylene glycol has been found, for example, polypropylene glycol having an average molecular weight of 4O25, which "is supplied from the Union Carbide Limited under the name" Niax Polyol PPG-4025 ". This »can be used together with the polyethylene polyphenyl cyanate

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Hardeners from Union Carbide Limited can be used, which is supplied under the name "Niax-AFPI". The Upjohn Company also supplies a polyethylene-polyvinyl isocyanate hardener under the name "PAPI" ·

A mixture component which, in addition to the polypropylene glycol as a catalyst, should also contain the tin salt a mixture of tertiary carboxylic acids with nine to eleven Contains carbon atoms are used * Such acids are made by the Shell Chemical Co. Limited under the designation "V ^ rsatic 911" launched.

Without limiting the invention thereto, the following some examples of the use of certain polyurethane mixtures described above for the manufacture of end caps for filter cartridges are described:

Example 1 »

In this example, the mixture component A of a polyurethane resin mixture consisted of a mixture of 100 parts by weight of "Niax-Folyol PPG-4Q25" and k parts by weight of tin salt '• Versatic 911 " as a catalyst. The mixture component B consisted of " Siax AFP! «» . ·

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The mixture components A and B were mixed together in the ratio 6.66: 1 and the mixture was for about Stirred slowly for one minute and poured into a mold. The end part of a yet to be described and based on the drawing The filter material structure to be explained was inserted into the mold; after a period of 2 1/2 hours a room temperature of 19 degrees Celsius had formed a solid mass that adhered to the filter material body and whose end cap formed.

When the process according to Example I ₁ was repeated, however, with vigorous stirring of both mixing components over a period of about 2 minutes, the mixture quickly became viscous and could no longer be poured into the mold.

Example 2.

The procedure was repeated gem. Example 1, but _t with additional heat supply purposes increase in the temperature during hardening to 4o ° C. The hardening time was thereby reduced to two hours.

Example 3 »

In this example, the mixture component A consisted of a mixture of 100 parts by weight of "Niax Polyol PPG-

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4025 "and 10 parts by weight of tin salt" Versätze 911 ". Again Mixture component B consisted of "Niax AFPI". Both Mixing components were mixed in the ratio of 6.7: 1.1 and the mixture was stirred again for one minute before being placed in the mold. The end part of a body of material was then inserted into the mold and the mixture was fully hardened after just 65 minutes, namely at a curing temperature of 4θ degrees Celsius.

When carrying out the method according to the invention, a mixer can of course be used to mix the two Mixing components are used that automatically measure the exact amount of each mixing component and the Mixture in the required amount into the mold, which gives the desired shape of an end cap or other part of the filter insert.

It has been found that polyurethane resin blends like them are described above, have particular suitability for the production of the article of the invention, since the hardened Mass is chemically resistant to the effects of most fuels if the according to the invention Process manufactured filter cartridges are used in filters for liquid fuels · This mass resists

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also the high operating temperatures that affect the filters have an effect if the produced by the method according to the invention Filter inserts are used in oil filters, e.g. in internal combustion engines.

Further advantages result from the fact _t that the mixtures contain no vaporizable solvent and as a result during curing no shrinkage of the workpieces occurs that no cost · loss of solvents and recovery thereof occur, and that in the preparation by using these mixtures simplification characterized occurs that the suction of occurring solvent vapors from the production rooms is superfluous. In addition, in certain cases, because the mixtures are hardening themselves to the application of additional external heat be omitted during the manufacturing process * Since the mass hardens evenly, there is no tilt that it cancel the use of the filter insert any small particles _t which is especially important in The use of the filter inserts for filtering oil in internal combustion engines is * With this type of use, the risk of particles loosening from the filter insert would at the same time represent a risk to the operational safety of the internal combustion engine.

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The manufacture of a specific shape of a filter insert for use in a lubricating oil filter of an internal combustion engine will be described below with reference to the accompanying drawings, but only about an embodiment is «show in the drawings

1 shows a filter insert according to the invention and a Corresponding shape for the formation of an end cap in a longitudinal section in a schematic representation?

FIG. 2 shows a filter insert according to FIG. 1 in plan view, partially erupted;

3 shows a liquid filter in which a filter insert is used according to Figures 1 and 2, in longitudinal section.

The complete filter insert 1 shown in FIG. 1 with two end caps 2 and 3 contains a filter material body 7 with an annular cross section. The filter material body 7 shown in the drawing is first formed from paper or other suitable material. The body 7 can be assigned an inner and an outer tube or an outer sleeve made of perforated metal, wire lane or other suitable material _? which the body 7 firm hold

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and protect the filter material »In the drawing is the filter insert is shown with an inner perforated tube 8 and an outer perforated sleeve 9 »

Fie can be seen from Figure 1, the two point to the opposite ends of the filter insert 1 attached end caps 2 and 3 different design, however they are both made by the method according to the invention, with a corresponding shape for each design has been used. One of these shapes, namely the shape M for shaping the end cap ... 3 », is indicated schematically in FIG. The filter insert is manufactured as described below.

The blend components of a self-curing polyurethane resin Mixtures of the types described are also in the described manner in a suitable filling machine mixed and the mixture is entered into the M shape. One end of the body 7 of filter material, with the perforated Parts, tube 8 and sleeve 9 »is then inserted into the relevant Form is used and is left to its own devices. As a result of the self-hardening of the mass ncgxii emerged the end caps 2 and 3 in the desired shape *

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As can also be seen from FIG. 1, the shape M used in the manufacture of the filter inserts for the End cap 3 has a circular recess N with a centrally located core C, so that the end cap from the self-hardening Substance is provided with a circular central opening 15 when it hardens in the mold. This opening 15 is aligned with a flow channel 11 in the filter material body 7t through which the liquid to be filtered during operation of the filter. The molded end cap further has an inner and an outer circumferential edge 16

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and 17, which have the filter material body 7 »at its ends / and overlap on the outside and thus a liquid-tight Effect sealing of the filter material body.

To shape the end cap 2, a mold is used which, in addition to the circumferential edges 5 and 6, which also overlap the filter material body 7, provides this end cap 2 with a center piece 10 which closes the channel 11 of the filter insert 1 at one end, except a small opening 12 for fastening the filter insert with simultaneous sealing to a bolt etc. _k of the housing accommodating the filter insert 1, details of which can be seen from FIG.

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As can be seen from the drawings, the central part 10 of the end cap 2 has a pair of molded lips 13, which run around the opening 12, and clear in their Cross-section protrude, but are arranged diverging. These lips 13 represent an effective seal, as will be described later.

Figure 3 shows a completely assembled filter, consist! ' from a base plate 20, which can be attached to a machine 21 or be a part thereof. The base plate has two channels 22 and 23, which the inlet (e.g.
Channel 22) and represent the outlet for the oil to be filtered. These channels 22 and 23 are in communication with the
Inside a filter chamber 24, which is located inside a housing 25, which in turn is held in a sealing manner against the base plate 20 by means of a bolt 26, the bolt 26 with. its threaded end into the base plate 20
or the machine 21 is screwed in. A spring washer is provided between the head of the bolt 26 and the housing 25.

The jacket 29 of the housing 25 engages in a groove 30 the base plate 20, into which a sealing ring 31 is inserted is.

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On the base plate 20 an annular plate 32 is provided against which the end cap 3 of the filter insert when the filter is assembled. This plate 32 can

be on part of the base plate 20 or in a suitable manner / this be attached. It provides an additional support for the end cap 3 of the filter insert when it is assembled against.pressed.

The base plate 20 has a below the plate 32 Channel 33, which has a bulge 3 ^ with the inlet channel 22 communicates. Entering the filter

As a result, medium, e.g. oil, enters through channel 22 the filter chamber 24 and surrounds the outer sides of the Filter insert 1.

After the medium has flowed through the filter element 1 is, it passes through a passage 35 to the outlet channel 23.

Is on the other end cap 2 of the filter element 1 a flat plate 36, which is guided on the bolt 26 and pressed against the filter insert 1 by a spring 37 will.

To ensure that all of the oil being filtered has the

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Filter flows through! must have a seal between the end cap 2 and the bolt 26, as well as between the end cap 3 and the plate 32. With the one described Filter insert 1, the seal is made possible by the elasticity of the hardened material of the end caps 2 and 3. this takes place through the spring 37 on the filter element caused pressure, which thereby the end cap 3 in a brings elastic contact with the plate 32 so that between Plate 32 and the end cap 3 are effective against liquids Sealing is created.

Similarly, the seal is made between the end cap 2 and the plate 36, although if necessary Sealing between the central part 10 of the end cap and the bolt 26 also means for effective sealing must be provided. This takes place through the lips 13 ″ which lie firmly and tightly on the bolt 26. These lips diverge normally only slightly apart from each other, but are forced apart by the bolt 26 which they place under the Firmly enclose the pressing pressure of the nut 28 (FIG. 3).

It is worth noting that a significant advantage dor invention is that the production is made possible by Filtereinritzen, the end caps have a sufficient degree of elasticity, to the points where the

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End caps Hn touch the sealing surfaces of the filter, sufficient Sealing made possible, that is to say on the opposite plates 32 and 36 according to FIG. 3 · polyurethane resin mixtures of the type described can be put together in such a way that that a wide range of different degrees of hardness or elasticity is available * It should be sufficient if the hardened mass results in end caps with a hardness in the range between 50 and 80 Shore degrees, wqwith on the one hand there is sufficient mechanical strength and, on the other hand, sufficient elasticity for a good seal Areas of lower hardness, e.g. between 50 and 60 Shore degrees, are preferable for filter inserts for filtering Fuels or lubricating oils in internal combustion engines, while areas of higher hardness, ζ.Β · between 70 and 8θ Shore degrees are preferable for filtering air or other gases.

In some cases, it may be desirable for the purpose most reliable sealing a higher degree of elasticity is selected. In such a case it is advantageous that in order to Increasing the mechanical strength of the end caps 2 and 3 • A metal washer is cast into the end caps * This Discs are then placed in the mixtures in the mold before the part of the filter material body is used in a device on which the polyurethane

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resin should adhere. It is also possible to produce the end caps 2 and in several steps, with only one mass is poured onto the filter material, which is relatively solid and then a layer of relatively elastic mass on the part that was first formed in order to achieve sufficient security for the seal.

The invention can of course also be used in the production of filter inserts from a material other than from Paper can be used. Examples of other materials for such purposes using the method of the invention . are felt, gauze (made of metal or plastic), and fibrous materials.

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Claims (1)

October 24, 1599/67 Claims 1. Filter insert for a technical filter, for example a fuel and a lubricating oil filter, in particular others on internal combustion engines, with a filter material larger due to the shape of the filter material generated filter surface, characterized in that on the body (7) made of filter material molded pieces (2,3) for holding the filter material in the body and / or for * formation of guide surfaces for the me to be filtered « that are made of hardened polyurethane resin 2. Filter insert according to claim 1, whose body (?) Is made of filter material with an elongated shape, characterized in that at least one end of the body (7) has an end cap (2,3) made of hardened polyurethane »· resin is attached, which by attaching a certain amount of a self-hardening polyurethane resin mixture. forms is. 3 · Filter insert according to claim 2, characterized in that at each of the opposite ends of the Body (7) an end cap (2,3) by attaching it by yourself «· _kl 0098A1 / U68 October 24, 1967 1599/67 curing polyurethane resin mixture on a part of the Body (7) is formed. 4. Filter insert according to claims 1 to 31 da ** characterized in that the end cap or end caps (2,3) are made of elastic polyurethane resin. 5 «filter insert according to one of claims 2 to 4, characterized in that the end caps (2,3) are made of hardened polyurethane resin the edges of the filter material «· body (7) with a circumferential edge (5 »6» l6,17) over »grip« 6. Filter, characterized in that there is a Has filter insert (l) according to claims 1 to 5, which is housed in a housing (25). 7. A method for producing filter inserts according to claims 1 to 5 »characterized in that on a part of the filter material body (?) a certain amount a polyurethane resin mixture is attached, which hardens itself and thereby a with the filter material body connected molding (2,3) forms. 8. The method according to claim 1, characterized in that 'marked * It is not possible that the polyurethane resin mixture is involved in at least one 009841/1468 October 24, 1967 1599/67 End of the elongated body Filter material attached and under molding au Bend cap (2,3) for the filter insert (l) hardened will · 9. The method according to claim 2, characterized in that the polyurethane resin genaiseh is attached to the opposite ends of the body (7) and outwardly forms two opposite end caps (2,3) for the filter insert (l) et will » 10. Method according to one of the preceding claims, characterized in that the polyurethane resin mixture is attached to the body C?) In such a way that the body (7) is inserted into the mixture with one or each end _} which is in a suitable form ( M) is located _o Lic method according to one of the preceding claims, characterized in that the polyurethane resin mixture consists of at least two components, which n & eh. Together »the mixture harden, and form a dry mass and that the mixture at the end parts. de 'body C?) is formed after mixing and before hardening dam " 12 "Method according to claim 11, thereby gaining"net; that the polyurethane harassment table is made up of components which, after being mixed together, harden exothermically and • Form a dry Μ «** β. 0 09841/1468 BATH October 24, 1967 1599/67 13> Method according to claims 11 and '12, thereby characterized that the components of the polyurethane resin mi β chap made of a propylene oxide polymer and an aroma - - polyisocyanate * «hardener. l4o method according to claim 6, characterized in that «* net that the components consist of a polypropylene glycol and an aromatic polyisocyanate «* hardener. 15 · Method according to claims I3 or 14, thereby marked that the hardener polymethylene # * Polyph «nyliso ·« is cyanate. 16. The method according to any one of claims 12 to I5 » characterized in that components are used whose mixture hardens without additional heat supply. 17. The method according to any one of the preceding claims, characterized in that polyurethane resin mixtures are used which cure to form an elastic polyurethane resin. 009841 / U68 Blank page