DE102006003949B4

DE102006003949B4 - Filter element with connection element

Info

Publication number: DE102006003949B4
Application number: DE200610003949
Authority: DE
Inventors: Roland Dobner; Eckart Driesen; Dieter Hintenlang; Holger Leubner; Karl-Heinrich Prof. Dr. Spies; Jochen Zabold
Original assignee: Freudenberg Carl KG
Current assignee: Freudenberg Carl KG
Priority date: 2006-01-26
Filing date: 2006-01-26
Publication date: 2008-04-30
Anticipated expiration: 2026-01-27
Also published as: DE102006003949A1; WO2007085427A1

Abstract

Filter element, comprising a filter medium (1) and at least one with the filter medium (1) connected connection element (2), wherein the connection element (2) sealing means (3, 4), wherein the sealing means (3, 4) and the connection element (2) are integrally formed, and wherein the filter medium (1) cylindrical is designed to form an axial passage (5) and at least one connecting element (2) on the end faces of the cylinder is arranged, characterized in that at least one connecting element (2) is provided with a thread which is formed so ductile is that the threads at the same time act as a sealant (4).

Description

Technical area
The The invention relates to a filter element according to the preamble of the claim 1.
State of the art
Out the prior art are already filter elements of the above Kind known. For example, gaskets are known which strip-shaped connection elements include, which are arranged on the end faces of the filter medium. These stripe Connection elements are provided with glued sealing lips, which from the strip-shaped Protrude connecting elements and come to housing walls to the plant. In this case, each connecting element is assigned a sealing lip.
The However, filter elements known from the prior art are not suitable, a flow-tight Installation of the filter element in complex shaped housings safely to deliver. Also, the filter elements have the disadvantage that the adhered sealing lips can come off.
From the DE 197 37 954 A1 a filter element is known, are arranged on which Stützwulste of a hot melt adhesive. The DE 195 34 468 A1 shows a filter element with a snap-in sealing lip in the axial direction. The DE 297 80 439 U1 discloses a filter element with a connection element, which is associated with a projecting in the axial direction of the sealing lip. Finally, that teaches DE 102 61 314 A1 to spray a metallic threaded insert around a connector.
Presentation of the invention
Of the Invention is now based on the object, a filter element to design and develop such that a solid and fluid-tight Fixation of the filter element to another component in constructive Simple design is feasible.
According to the invention solved above object with the features of claim 1.
After that is a filter element of the aforementioned type according to claim 1, characterized in that at least one connecting element with a thread is provided, which is formed ductile in such a way that the threads at the same time act as a sealant.
According to the invention is recognized been that this configuration subsequent processing steps avoids the connection element during which sealant in more elaborate Be molded or molded on. A detachment of Sealant is thus almost impossible, creating an optimal Filter performance guaranteed becomes.
The Filter medium is cylindrical designed to form an axial passage and a connection element is arranged on the front sides of the cylinder element. This concrete Design allows the use of the filter element as a filter cartridge. The cylindrical shaped filter medium in connection with the connection element at least an end face of the cylinder gives the filter element a special Stability. This stability allows the use of the filter element not only in gas flows such as Air, but also in liquid flow media like oil. Such a filter cartridge may therefore be preferred as an oil filter Find use.
At least a connecting element is threaded. This concrete Design allows the solid investment of a tubular element within the axial passage of a cylinder-shaped filter medium, if an internal thread is provided. Against this background is the internal thread is so elastic or conical, that the threads at the same time act as a sealant: By this configuration is not just a fixed fixation of a tubular element within the Filter medium, but also a sealing system ensured. Against this background, it is also conceivable to provide an external thread, so that the filter element in a recording fluid-tight screwed.
consequently the task mentioned at the beginning is solved.
In front In this background, it is conceivable that the connection element and the Filter medium made of the same material. This embodiment allows for the manufacture of the filter element, the use of only one Material and thereby minimizes storage costs. Consequently, it is a particularly cost-effective Manufacturing process feasible. In particular, it is conceivable that a Die-cut, which is made of the material from which the filter medium exists, is placed on the filter medium and with this thermally is connected. It is also conceivable that the connection element from the Filter medium is formed. This can also be done by a thermal treatment carried out by namely the end portions of the filter medium softened and brought into shape. In this process can simultaneously Sealant are attached to the connection element.
in this connection Seam or interfaces are effectively avoided and increased tightness ensures the filter element.
At least a sealant could in the direction of the axial passage, namely in the radial direction inside, extend. This concrete design ensures that a filter cartridge not only in terms of its outer circumference or re the end faces can be sealed, but also with respect to their inner circumference. This is particularly advantageous when in the axial passage tubular Elements introduced against its outer circumference must be sealed. The design thus allows the arrangement a filter cartridge in a complex shaped housing, which a tubular Element is assigned. The filter cartridge is on the tubular element aufstülpbar, being against the outer surface of the tubular Elementes and against the inner wall of the housing can be sealed. Especially when using the filter element as a filter cartridge for filtering oils by this form of sealing the life of adjacent to the filter housing Parts extended become. This is caused by the fact that almost no leaks occur can, through the contaminants can penetrate into the adjacent components.
In front this background could the sealing means extend in mutually orthogonal directions. This geometric arrangement of the sealant allows a trouble-free Production and a tight positioning of the filter element in common housings with mutually orthogonal walls. For example, it is conceivable that a disc-shaped Connection element on its inner or outer circumference a sealant as well as on its surface having a sealant.
hereby can against cylindrical walls and an orthogonal thereto Abdeckwandung a cylindrical housing be sealed.
The Sealants could as protuberances be designed. It is conceivable that the sealant as semicircular, oval or triangular protuberances are configured which sealing by a press fit against a housing wall can be applied.
At least a connecting element could from a castable or injection moldable Be made of material. This concrete embodiment facilitates the formation of the sealant on the connection element. hereby becomes the integral manufacturing of the connection element and the sealant especially simplified. Against this background, it is conceivable that as injection moldable Material liquid rubber is used. This material is characterized by a special easy processing and high elasticity.
a particularly cost-effective and chemically resistant Material represents polyurethane. This material can be process easily and has a high chemical resistance to almost all Fluids on. Furthermore Polyurethane is characterized by its viscosity behavior especially as a material, as it also in fine cracks and crevices can penetrate and so far a dense, cohesive connection between filter medium and connecting element can ensure. During the Processing polyurethane is very low viscous, but cures after processing relatively fast.
In could be beneficial Acrylate rubber (ACM) as pourable or injection moldable material be used. This material is characterized by a high oil resistance out. Furthermore could Fluororubbers find use, which is characterized by a particularly high temperature stability distinguished. In order to realize a high abrasion resistance, natural rubbers could be used Find. These are also inexpensive.
The connection element could be produced by the following method steps:
A zig-zag folded filter medium is introduced into a cavity of a mold formed complementary to the filter medium. Thereafter, about 200 ° C hot material is introduced into the mold, which can flow into the fold edges and is prevented by the wall of the mold from spreading in the radial direction. The 200 ° C hot material is usually a thermoplastic material or a liquid rubber. It is particularly important to ensure that the material is chosen so low viscous that the wrinkles are not moved in position or deformed. As a result, the filter property is adversely affected. Against this background, it is conceivable that the shape has star-shaped protuberances which engage in the fold backs and stabilize them during the injection process. If such a mold is used, it is also possible to use highly viscose or higher-viscous materials, since the risk of deformation of the folds no longer exists.
In front this background could also find silicone use. This material stands out a high temperature resistance is still sufficiently ductile after the cross-linking process, to absorb stresses and deformations nondestructively.
Conceivable is also to use thermoplastic materials. These can with suitable tools particularly easy in the geometric shape the connection elements described here are brought.
At least a connecting element could be provided with a groove. The provision of a groove allows the subsequent Applying a sealing material within the groove. It is conceivable that the groove is designed with an undercut, into which the sealing material can flow, to a firm connection Secure with the connection element. Against this background could one Groove also define a cavity to increase the stability of the terminal element to increase. there could the groove be designed as a defined vulnerability.
The Filter medium could be configured as a nonwoven fabric. The use of a nonwoven fabric allows easy adjustment of the filter medium in terms on his porosity, because nonwovens in virtually all porosities commercially problem-free available are.
Of the Nonwoven could consist of thermoplastic fibers. The use of thermoplastic Fibers allow a fusion and thus a cohesive connection the filter medium with a connection element, since both filter medium as well as connecting element can soften. The connection can be through a method can be produced in which the connection element in a heated mold is placed and the filter medium is pressed against the connection element with a defined force. Optionally, the filter medium and / or the connection element be connected by rotational movements with his joining partner. It contributes the rotation helps the joining partners to get together connect and penetrate each other. Against this background, it is conceivable that the thermal process friction welding, ultrasonic welding or methods that use microwave radiation.
The filter medium could be assigned a pre-filter. The pre-filter advantageously realizes a pre-separation of certain particles, whereby the life of the actual filter medium can be extended. As a pre-filter may preferably be used a spunbonded nonwoven, which has a basis weight of 30 to 200 g / m ² . Such a spunbonded fabric has proven to be particularly suitable for use when the filter element flows with liquid media. This spunbonded fabric has sufficient strength and is not prone to rupture. It is also conceivable to use a wet-laid nonwoven fabric as a pre-filter. Such a nonwoven fabric is particularly inexpensive.
Of the Prefilter could peripherally around a cylindrical arranged filter medium arranged and with this by thermal Welding process selectively or linear be connected to make a firm connection. If that Filter medium has wrinkles, the pre-filter also acts as Fold stabilization.
The Filter medium could as a star-shaped bellows be designed. The provision of folds in the filter medium increases this effective filter surface. The relative spacing of the folds could be due to each other a welded on Ribbon done, which has a width between 4 and 8 mm. It could pro Filter element 1 to 4 ribbons be provided. These dimensions or have this number especially advantageous with regard to the stability of the filter element in the filtration of liquids proved. The ribbon could with the pleat tips by thermal welding methods such as ultrasonic welding or laser welding be connected. Against this background, it is conceivable to use a pre-filter as To use wrinkle stabilization. This could be the prefilter with some or thermally welded to all pleat tips. In such a Design of the filter medium could be the connection element Star profile have. The star profile could be the spacing of the folds stabilize the filter medium.
It are now different ways to design the teaching of the present invention in an advantageous manner and continue to form. This is on the one hand to the downstream Claims, on the other hand, to the following explanation of a preferred embodiment of the invention with reference to the drawing.
In Connection with the explanation of the preferred embodiment The invention with reference to the drawings are also generally preferred Embodiments of the teaching explained.
Brief description of the drawing
In the drawing shows the only one
FIG. a star-shaped Filter element with connection elements, which are designed as end caps.
Embodiment of the invention
The sole FIGURE shows a filter element with a filter medium 1 and a connecting element connected to the filter element 2 , The connection element 2 can with the filter medium 1 cohesively be connected. The connection element 2 has two different sealants 3 and 4 on, which extend in two different directions for sealing contact with each abutment.
The filter medium 1 is cylindrical to form an axial passage 5 designed. Each is a connection element 2 arranged on the front sides of the cylinder. The sealant 4 extends in the direction of the axial passage 5 , namely in the direction of the axis of symmetry A, ie in the radial direction inwards. The sealant 3 extends in the radial direction to the outside.
The sealants 3 . 4 are arranged concentrically in the specific case. The sealant 3 , which is designed as a circular protuberance, each tapers in the direction in which it is to be applied to sealing surfaces.
In this case, the axial passage 5 be filled by a tubular element, which on the sealant 4 comes to the plant and acts as an abutment. The sealant 4 is designed as a thread into which an abutment can be screwed tight. Due to the ductility of the threads a sealing contact with the screwed abutment is ensured.
The sealant 3 can be applied against the inner wall of a cylindrical housing.
The sealants 3 . 4 and the connection element 2 are integrally formed. The sealant 3 is designed as a semicircular protuberance. The protuberance 3 is designed as a circumferential sealing lip.
The connection element 2 and the sealant 3 . 4 are made of polyurethane.
The filter medium 1 is designed as a nonwoven fabric and consists of thermoplastic fibers. The filter medium 1 is a pre-filter 6 assigned, which comprises a spunbonded nonwoven. The pre-filter 6 is shown interrupted, but wraps the filter medium 1 in full.
The filter medium 1 is designed as a star-shaped bellows.

Claims

Filter element comprising a filter medium ( 1 ) and at least one with the filter medium ( 1 ) connected connection element ( 2 ), wherein the connecting element ( 2 ) Sealant ( 3 . 4 ), the sealing means ( 3 . 4 ) and the connecting element ( 2 ) are formed integrally and wherein the filter medium ( 1 ) cylindrical to form an axial passage ( 5 ) is configured and at least one connection element ( 2 ) is arranged on the end faces of the cylinder, characterized in that at least one connecting element ( 2 ) is provided with a thread which is formed ductile in such a way that the threads at the same time as a sealant ( 4 ) act.
Filter element according to claim 1, characterized in that at least one sealing means ( 4 ) in the direction of the axial passage ( 5 ).
Filter element according to claim 1 or 2, characterized in that the sealing means ( 3 . 4 ) extend in mutually orthogonal directions.
Filter element according to one of claims 1 to 3, characterized in that the sealing means ( 3 . 4 ) are designed as protuberances.
Filter element according to one of claims 1 to 4, characterized in that at least one connecting element ( 2 ) is made of a castable or injection-moldable material.
Filter element according to claim 5, characterized in that that the materials include polyurethane.
Filter element according to one of claims 1 to 6, characterized in that at least one connecting element ( 2 ) is provided with a groove.
Filter element according to one of claims 1 to 7, characterized in that the filter medium ( 1 ) is configured as a nonwoven fabric.
Filter element according to claim 8, characterized in that that the nonwoven fabric consists of thermoplastic fibers.
Filter element according to one of claims 1 to 9, characterized in that the filter medium ( 1 ) a prefilter ( 6 ) assigned.
Filter element according to one of claims 1 to 10, characterized in that the filter medium ( 1 ) is designed as a star-shaped bellows.