DE102013014496A1 - filter element - Google Patents

Abstract

The invention relates to a filter element (10) which has a filter body (12) in concentric form with a longitudinal axis (L), a first end disk (16) arranged on one end face (15) and a second end disk arranged on the opposite end face (17) (18). At least one of the end disks (18) has a nozzle-like centering structure (20) arranged around the longitudinal axis (L), which in the installed state has an elastic compensation element (22) and a housing (108) in a cover (110). mounted counter-element (24) cooperates, whereby the filter element (10) when installed in the housing (108) is radially centered and / or braced. The invention further relates to a filter system (100) for interchangeable installation of such a filter element (10).

Description

Technical area

The invention relates to a filter element, in particular for use as an air filter of an internal combustion engine, and a filter system for installing such a filter element.

State of the art

From the DE 10 2007 017 091 A1 a ring filter element is known in which an inner frame, which is arranged on an inner circumferential surface and on the axial end faces of a filter body of the ring filter element, encapsulated in the axial end faces of the filter body with sealing material and embedded in this, but not in the region of the inner surface of the filter body , The provided with an axial seal end plate is limited to the end face of the filter body or the ring filter element. In the area of the inner circumferential surface, an application of sealing material is limited to the areas between the webs of the inner frame. An inner diameter of the end plate is at least as large as an inner diameter of the inner frame in all areas, whereby the inner frame, which is designed in particular as a support grid, is not covered radially in at any point by sealing material of the end plate (axial seal). The end plate is formed from the filter material sealing material.

In the DE 10 2007 017 091 A1 the inner frame has an axially projecting beyond the filter body ring, which is part of a Innenzargenseitigen radial step and which is embedded in an annular sealing lip of the end plate. The ring stiffens the annular sealing lip. Since the sealing material of the end plate / axial seal completely surrounds the ring projecting axially beyond the filter body, it does not come into contact with the filter housing; the support structure is firmly connected via the end plate / axial seal with the filter body of the ring filter element.

Usually, the filter elements are replaced by air filters after a certain period of operation. Depending on the amount of dust, the service life of an air filter can be a few days, such as when used in construction machinery, up to several months in a less polluted environment.

Especially with frequent replacement of filter elements, the reliable and reliable sealing of the filter element in a housing is important. The seal should be temperature resistant and vibration test carried out. Even in systems or facilities that are exposed to strong vibrations or vibrations, the sealing of the filter element must be ensured. At the same time, however, the filter element itself should as far as possible have no metallic elements so that it can be easily disposed of thermally.

An object of the invention is therefore to provide a filter element with a reliable seal between the region of the unfiltered and the region of the filtered medium, which ensures a safe mountability especially with repeated replacement of the filter element.

Another object of the invention is to provide a filter system for receiving such a replaceable filter element with a reliable seal and secure mountability.

The above objects are achieved according to one aspect of the invention by a filter element, wherein at least one of the end plates has a arranged about the longitudinal axis nozzle-like centering, which cooperates in the mounted state with an elastic compensation element and with a mounted in a cover of a female housing counter element, whereby the filter element during installation in the housing is radially centered and / or braced.

Favorable embodiments and advantages of the invention will become apparent from the other claims, the description and the drawings.

Disclosure of the invention

A filter element is proposed that comprises a filter body in concentric form with a longitudinal axis, a first end disk arranged on one end face and a second end disk arranged on the opposite end face. In this case, at least one of the end disks arranged around the longitudinal axis nozzle-like centering, which cooperates in the mounted state with an elastic compensation element and with a mounted in a cover of a female housing counter element, whereby the filter element when installed in the housing radially centered and / or braced is.

According to the invention, the filter element has a decoupling of the functions sealing a filter body, which provides as an essential part of the filter system for the filtration of a medium to be filtered, on an end face, and tension of the filter element in the housing of a filter system. The sealing of the filter body is effected by an end plate, while the tension in the housing by a centering structure which is arranged on the end plate, and a separate elastic compensation element and a cooperating counter element in the lid of the housing. The elastic compensation element causes in addition to the permanent tension in the housing tolerance compensation when installed in the housing.

The use of a hard end disk on an end face of the filter element causes, on the one hand, a very high radial rigidity and thus robustness for use in the construction machinery and agricultural machinery sector and, on the other hand, a better transmission of the tensioning force into the filter body. By separating the compensating element, which is preferably made of a soft elastic material, its properties can be better matched to the application and / or its tasks of permanent tension. Furthermore, a centering by an adapted receiving geometry of the compensating element is possible.

The centrally arranged centering structure has the advantage that tighter tolerances can be taken into account for a central radial guidance of the filter element, in particular in the case of large filter elements, than in the case of a guide arranged on the outer edge of the filter elements. Also, in this separation of centering and support function, the assembly of the filter element in the housing can be very low, since in this way when closing the housing cover only the centering takes place, which is executable with low mounting force, and only then the tension of the filter element in the housing over the support function can be done. In this way, the filter element is already placed in the correct location during the frictional assembly and the situation must not be corrected under tension any more, which could damage the filter element to sealing and / or centering.

This is for larger and thus heavier filter elements especially for the construction machinery or agricultural machinery advantage and also optimizes the repeated removal and installation of the filter elements in the service. When using such a filter element in the construction machinery or agricultural machinery sector, the filter load with dust and dirt particles is very high, so that the weight of a loaded filter element can increase by a few kilograms. The filter element as well as the associated filter system must be designed to be robust.

Advantageously, the centering structure and / or the compensation element can be annular. Such a rotationally symmetrical arrangement facilitates positioning of the filter element in a housing, especially in heavy filter systems, since it is not necessary to pay attention to the exact mounting position with respect to a rotational position. Alternatively, centering structure and / or compensating element can also be divided into segments in a ring-shaped manner, in particular, the compensating element can also be divided into segments as a centering structure in the case of a continuous centering ring, which can make installation easier.

Conveniently, the compensation element can be arranged on one side of the centering, which faces in the assembled state, the counter-element to perform the function as a tolerance compensation. In this way, an effective and permanent tension against the lid and the housing of a filter system can be achieved.

In an advantageous embodiment, the at least one end plate can be designed in one piece with the centering structure. Since both the end plate and the centering preferably can be made of solid material and should be as firmly connected as possible, both parts are conveniently made of one piece.

Thus, an introduction of force from the centering structure via the end plate into the filter body can be effected in an advantageous manner.

Therefore, it is also best possible if the at least one end plate made of a hard plastic and / or a sheet, with a plastic is preferable, so that the filter element can be disposed of thermally.

By contrast, the compensating element can preferably consist of a polyurethane foam or an elastomer, since it is intended essentially to effect a bracing function and at the same time also a tolerance compensation. To achieve this, a soft elastic material is favorably chosen.

Conveniently, the at least one end plate may be attached to the filter body with one of the welding, gluing, sprinkling, foaming methods. In order to fulfill the function of a tension in the housing low, the strongest possible connection between end plate and filter body is important. Especially with large and heavy filter elements, such as those used in construction and agricultural machinery, as well as under appropriate vibration in such applications, but considerable forces are transferred to the connection between the end plate and filter body in the tension. Environmental factors such as higher temperatures and / or humidity also play a decisive role in use in a wide variety of climates.

In a favorable embodiment of the filter body can be pleated, executed in an annular closed and made of paper, with paper Reinforced plastic fibers and / or made of plastic-coated paper. The use of these materials as a filter medium is a very economical way to realize such a filter element. At the same time, the shape design described offers a stable arrangement, so that a self-supporting construction of the filter body and thus a favorable mounting property is given.

Conveniently, the filter element can be used as an air filter, in particular as an air filter of an internal combustion engine. The safe operation of internal combustion engines is also based on a safe and cheap filtering of the intake air for combustion operation. The filter element described represents an economical possibility for this.

Also advantageous is the use of the filter element as a particulate filter, in particular as a diesel particulate filter of an internal combustion engine. Again, the safe installation and economic interchangeability of the filter element described are of crucial importance.

According to a further aspect, the invention relates to a filter system with a filter element according to one of the preceding claims, comprising a housing which is constructed essentially concentrically about a longitudinal axis, a lid closing the housing, which is likewise constructed concentrically around the longitudinal axis and on its inside a counter-element which cooperates with a centering of the at least one end plate and a compensating element, and which has on its inside a lid contour, whereby the filter element is radially centered and / or clamped when installed in the housing, one arranged on the housing and / or lid Inlet for supplying the medium to be filtered, in particular air, wherein an outlet for discharging the filtered medium is provided on the housing concentric to the longitudinal axis, wherein on the housing in the region of the outlet, a sealing contour is provided which communicates with the radial seal of the first end plate of the filter element corresponds, wherein the filter element is interchangeable disposed in the housing of the filter system.

The main advantage of such a filter system lies in the safe and stable installation of the filter element and a very economic interchangeability of the filter element in case of service. Especially with low downtimes, as they can occur in agricultural and construction machinery use, the rapid interchangeability of great importance.

Advantageously, a cyclone separator may be provided in the region of the inlet of the filter system and a dirt outlet may be provided on the housing or on the lid. This cyclone separator consists of a guide geometry, which sets the medium to be filtered into a rotation. By this rotation, the dirt is concentrated in the area of the housing wall and discharged at a suitable location via a dirt outlet. By pre-separation of most of the dirt from the air to be filtered, the service life of the actual filter element can be significantly extended.

According to a further embodiment of the invention, a secondary element may be arranged in the interior of the filter element. The secondary element, which may consist of a supporting structure, which is covered with a permeable filter medium, for example a fleece, has the task of keeping the outlet of the filter system still closed when replacing the filter element so that no dirt enters this area while the filter element is being cleaned or replaced. The secondary element is connected in a preferred embodiment via a screw connection to the housing and provided to the housing with a seal.

Advantageously, the compensation element can be arranged on the counter element of the cover on the side facing the centering structure. In this way, the bracing function can be beneficial effect, also can also represent a tolerance compensation by different manufacturing tolerances in the filter element and housing low.

Advantageously, the cover of the housing have a driving tool which corresponds to a driving contour of the secondary element. The service-related replacement of screwed elements of a filter system such as filter elements and secondary elements is usually done by loosening and tightening by hand. Especially with large elements, however, it is becoming increasingly difficult to apply the required torque. Therefore, more and more separate tools are used to release the elements and tighten again, as larger moments can be applied by greater leverage. This tool can now be integrated into the lid of the filter system so that it is always available on site in case of service and can not be lost. For example, the lid may have a driving contour, which is also provided in its negative mold in the element to be replaced, so that it is sufficient to solve the lid of the filter housing, for example, turn over, set up with the driving tool on the element to be solved and this via a rotational movement to turn the lid off. In this case, the lid presents The tool is, or is used to handle the tool when using the tool.

Brief description of the drawings

Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

They show by way of example:

1 a perspective view of a filter system according to an embodiment of the invention with tangential inlet, centric outlet and bottom dirt outlet;

2 a perspective view of a filter system according to an embodiment of the invention with radial inlet and centric outlet;

3 a perspective view of a filter element according to an embodiment of the invention with a view of a second end plate with a centering structure, and a compensation element mounted thereon;

4 an interior view of a lid of a housing of a filter system with a counter element according to an embodiment of the invention, which can cooperate with a centering structure of the filter element;

5 a partial longitudinal section of a filter system according to an embodiment of the invention with a view of the interaction of centering and counter-element.

Embodiments of the invention

In the figures, the same or similar components are numbered with the same reference numerals. The figures are merely examples and are not intended to be limiting.

1 shows a perspective view of a filter system 100 according to an embodiment of the invention with tangential inlet 102 , centric outlet 104 on a housing front side and bottom-side dirt outlet 106 , Shown is a round filter design, consisting of a housing 108 that exists with a lid 110 , for example, with screw or bayonet lock, is closed.

When used as an air filter system, dust-laden air flows into the inlet 102 , which is arranged tangentially to the internally mounted air filter element, so that the air inside the housing 108 by a flow protection, as a cyclone separator 36 works, is placed on the filter element in a rotational movement. Filter element and flow protection, or cyclone separator 36 , are not shown in the drawing, as they are not visible in the housing. By caused by the rotational movement of the air cyclone effect centrifugal forces act on the dust particles of the flowing air, so that they are partly deposited on the housing wall and the dirt outlet 106 from the filter system 100 can flow out. As a result, the filter element is less loaded, the service life of the filter element is increased. The purified air can through the centric outlet 104 out of the case 108 be dissipated.

2 shows a perspective view of a filter system 100 according to an embodiment with cover-side inlet 102 and centric outlet 104 , Shown is also a round filter design, consisting of a housing 108 that exists with a lid 110 is closed. The inlet, through which dust-laden air can enter the housing, is in this case arranged centrally above the internally mounted filter element. The outlet 104 , through which the purified air can flow, is also like in 1 arranged centrally.

Such filter systems as in 1 and 2 are usually used in construction machinery and agricultural machinery. They are characterized by great robustness and have short life due to the high filter load. A filter system 100 with loaded filter element must tolerate a weight gain of 10 kg or more.

3 shows a perspective view of a filter element 10 according to an embodiment of the invention with a view of a front side 17 attached second end plate 18 with a centering structure 20 , as well as an attached compensation element 22 , The end disc 18 , which may consist of a hard plastic or a sheet, has as a centering structure 20 a raised in the longitudinal axis stubby annular collar on the outside with a compensation element 22 is provided, which may for example be made of a flexible plastic such as polyurethane foam or an elastomer. The end plate is expedient 18 with the centering structure 20 made in one piece. The end disc 18 is with the filter body 12 firmly connected, for example, with one of the methods welding, gluing, injection molding, foaming. The compensation element 22 may be sprayed or foamed on it. Of the filter body 12 is on another front 15 with a first end disc 16 completed and may be pleated, annular closed executed and made of paper, made of paper reinforced with plastic fibers and / or made of plastic-coated paper.

In 4 is an inside view of a lid 110 a housing of a filter system with a counter element 24 to see according to an embodiment of the invention, which can cooperate with a centering structure of the filter element. For the in 3 shown centering with compensation element is the counter element 24 in the example shown as a circular recess in the lid contour 114 on the inside of the lid 110 executed.

The lid 110 has a takeaway tool in its center 118 in the form of a depression which corresponds to a driving contour of a secondary element. By loosening the lid 110 and reversed placement on this driving contour can be unscrewed by turning the lid of this secondary element. The advantage is that this driving tool 118 always available on site and also has the appropriate contour for the secondary element used in the filter system.

5 shows a partial longitudinal section of a filter system 100 according to an embodiment of the invention with a view of the interaction of centering 20 and counter element 24 , On average, you can see how the end disc 18 at the front 17 on the filter body 12 attached and firmly connected to this. The centering structure 20 is like a branch perpendicular to the end plate 18 pulled up in longitudinal axis L and in radial outward view with a compensation element 22 provided that the counter element 24 facing, in the counter element 24 in the lid 110 , a circular depression, immersed and thereby radially centered and braced. Alternatively, the compensation element 22 on the counter element 24 of the lid 110 on the centering structure 20 be arranged facing side. Next is a inside 50 of the filter element 10 arranged secondary element 28 to recognize.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102007017091 A1 [0002, 0003]

Claims (16)

Filter element ( 10 ) comprising a filter body ( 12 ) in concentric form with a longitudinal axis (L), a first at an end face ( 15 ) arranged end plate ( 16 ) and a second one at the opposite end ( 17 ) arranged end plate ( 18 ), wherein at least one of the end discs ( 18 ) a about the longitudinal axis (L) arranged nozzle-like centering structure ( 20 ), which in the assembled state with an elastic compensation element ( 22 ) and one in a lid ( 110 ) of a receiving housing ( 108 ) mounted counter element ( 24 ), whereby the filter element ( 10 ) when installed in the housing ( 108 ) is radially centered and / or braced. Filter element according to claim 1, wherein the centering structure ( 20 ) and / or the compensation element ( 22 ) are annular. Filter element according to claim 1 or 2, wherein the compensating element ( 22 ) on one side of the centering structure ( 20 ) is arranged, which in the assembled state the counter element ( 24 ) is facing. Filter element according to one of the preceding claims, wherein the at least one end plate ( 18 ) with the centering structure ( 20 ) is made in one piece. Filter element according to one of the preceding claims, wherein the at least one end plate ( 18 ) consists of a hard plastic and / or a sheet metal. Filter element according to one of the preceding claims, wherein the compensating element ( 22 ) consists of a polyurethane foam or an elastomer. Filter element according to one of the preceding claims, wherein the at least one end plate ( 18 ) on the filter body ( 12 ) is attached with one of the welding, gluing, sprinkling, foaming. Filter element according to one of the preceding claims, wherein the filter body ( 12 ) is pleated, closed ring-shaped and made of paper, made of paper reinforced with plastic fibers and / or consists of plastic-coated paper. Use of a filter element ( 10 ) according to one of the preceding claims, as an air filter, in particular as an air filter of an internal combustion engine. Use of a filter element ( 10 ) according to one of the preceding claims, as a particulate filter, in particular as a diesel particulate filter of an internal combustion engine. Filter system ( 100 ) with a filter element ( 10 ) according to any one of the preceding claims, comprising - a housing ( 108 ), which is constructed essentially concentrically about a longitudinal axis (L), - a housing ( 108 ) closing lid ( 110 ), which is also constructed concentrically about the longitudinal axis (L) and on its inside a counter element ( 24 ), which with a centering structure ( 20 ) of the at least one end plate ( 18 ) and a compensation element ( 22 ) cooperates, and which on its inside a lid contour ( 114 ), whereby the filter element ( 10 ) when installed in the housing ( 108 ) is radially centerable and / or braceable, - one on the housing ( 108 ) and / or lid ( 110 ) inlet ( 102 ) for supplying the medium to be filtered, in particular air, wherein on the housing ( 108 ) concentric with the longitudinal axis (L) an outlet ( 104 ) is provided for the discharge of the filtered medium, wherein the housing ( 108 ) in the area of the outlet ( 104 ) a sealing contour ( 116 ) provided with the radial seal ( 26 ) of the first end plate ( 16 ) of the filter element ( 10 ), wherein the filter element ( 10 ) replaceable in the housing ( 108 ) of the filter system ( 100 ) is arranged. Filter system ( 100 ) according to claim 11, wherein in the region of the inlet ( 102 ) a cyclone separator ( 36 ) is provided and on the housing ( 108 ) or on the lid ( 110 ) a dirt outlet ( 106 ) is provided. Filter system ( 100 ) according to claim 11 or 12, wherein a secondary element ( 28 ) internally ( 50 ) of the filter element ( 10 ) is arranged. Filter system ( 100 ) according to claim 13, wherein the secondary element ( 28 ), with the housing ( 108 ), when changing the filter element ( 10 ) in the housing ( 108 ) remains. Filter system according to one of claims 11 to 14, wherein the compensation element ( 22 ) on the counter element ( 24 ) of the lid ( 110 ) on the centering structure ( 20 ) facing side is arranged. Filter system ( 100 ) according to claim 13 or 14, wherein the lid ( 110 ) of the housing ( 108 ) a driving tool ( 118 ), which with a driving contour ( 56 ) of the secondary element ( 28 ) corresponds.

Images