DE102014014319A1 - Secondary element for a filter system - Google Patents

Abstract

The invention relates to a secondary element (28) having a longitudinal axis (L) and two end faces (54, 56) comprising a filter medium (58) arranged around the longitudinal axis (L), at least one of the two end faces (54, 56) having a Opening (30) is provided, wherein on the first end face (54) an upper clamping element (32) and on the second end face (56) a lower clamping element (34) is arranged, wherein the secondary element with the opening (30) on a support tube (14) of a filter system (100) is attachable. The invention further relates to a filter system (100) for interchangeable installation of such a secondary element (28).

Description

Technical area

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

State of the art

It is known to use air filters to combustion air intake for internal combustion engines in motor vehicles, for. As cars, commercial vehicles, work machines, agricultural vehicles, but also stationary generators and the like to filter. Such air filters generally include a housing, an air inlet, and an air outlet, with a removable and replaceable main filter element disposed in the housing. The housing often includes a service or access cover for access to the internally contained filter element in case of maintenance. For this purpose, the filter element can be dismantled and either replaced by a brand new filter element, overhauled and reused, or replaced by a previously used, but reconditioned 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.

To protect the clean side of an air duct system of an internal combustion engine when replacing a filter element from penetrating dirt particles often a so-called secondary element is present in air filter systems, which remains in the exchange in the filter system. The secondary element usually sits on the clean side of the filter element, for example in the interior of a round filter element and is connected to the housing of the filter system. The secondary element itself also has a filter medium, which keeps the remaining dirt particles in the air flow from the filter outlet. The secondary element itself can also be exchanged, since it can be loaded with dust particles, but at much greater intervals than the actual filter element.

From the US 8,480,778 B2 An air filter system is known in which there is a secondary element consisting of a filter medium in a hollow cylinder arrangement which is capped at one end and open at the other end. With the open end, it can be slipped over a support tube connected inside the filter element and with the filter housing and thus protect the outlet of the filter system against penetrating dirt particles. About the mounted on the support tube secondary element then the actual filter element is mounted, which rests on the free end of the support tube and thus on the cap of the secondary element.

An object of the invention is therefore to provide a low-cost secondary element for a filter system, which ensures a reliable sealing of the clean side of an air duct system, especially when replacing the filter element in case of maintenance, with simple and safe mountability.

Another object of the invention is to provide a filter system for receiving such a replaceable secondary element, which ensures reliable sealing of the clean side of an air duct system, in particular when replacing the filter element during maintenance.

The above objects are achieved according to one aspect of the invention by a secondary element having a longitudinal axis and two end faces, which comprises a filter medium arranged around the longitudinal axis. In this case, an opening is provided on at least one of the two end sides, wherein the secondary element with the opening on a support tube of a filter system can be attached

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

Disclosure of the invention

A secondary element with a longitudinal axis and two end faces is proposed which comprises a filter medium arranged around the longitudinal axis. In this case, an opening is provided on at least one of the two end faces. At the first end face, an upper clamping element and at the second end side, a lower clamping element is arranged, wherein the secondary element can be attached to the opening on a support tube of a filter system when used as intended.

When used as intended, the secondary element can be arranged on the clean side of a filter element. The secondary element, which according to the invention can be attached to the support tube and which may comprise a permeable filter medium, for example a flexible, slightly elastic nonwoven, has the task of keeping the outlet of the filter system still closed together with the support tube when replacing the filter element that no dirt can enter this area while the filter element is being cleaned or replaced. The secondary element itself therefore does not include a support tube, but consists of the filter medium, which is flexible, for example, and is pushed onto the support tube of the filter system. The secondary element according to the invention can have openings on both end faces, each of which can have an elastic round cord as a tensioning element. The first end face can be sealed after being pushed onto the support tube by the round cord, the second end face can also be held and sealed thereby.

Advantageously, the upper and lower clamping elements can thus be designed as seals. These seals seal the clean side of an outlet of the filter system even with filter element exchange against penetrating dirt particles. Conveniently, the upper clamping element and / or the lower clamping element comprise an elastic round cord. This is a very cost-effective solution, on the one hand to hold the secondary element on the support tube and on the other hand also to seal against penetrating dirt. The round cords may for example be welded to the filter medium or welded into loops of the filter medium. Alternatively, a sewing or gluing is possible.

In an advantageous embodiment, the lower clamping element may comprise a closing ring. Such a closure ring can ensure a secure fit of the secondary element when used properly on the support tube by preventing the secondary element on the support tube during operation can slide down. Such a closing ring can also have locking elements, so that it can be locked to corresponding counter-elements in the support tube and not unintentionally solvable. Furthermore, the secondary element can also be removed again by simply rolling up the flexible nonwoven fabric via the closing ring.

It may also be expedient if a diameter of the upper clamping element is smaller than a diameter of the lower clamping element. As a result, the mounting position is defined and the secondary element is geometrically fixed and fixed in height when mounted on the support tube.

Advantageously, the end ring comprise an assembly aid for mounting / dismounting of the secondary element. For example, a collar can be attached to the closing ring as a grip aid, by means of which the fleece of the secondary element can be rolled slightly downwards onto the support tube during assembly and can also be rolled up again during disassembly.

Conveniently, the upper clamping element can provide a grip aid for disassembly of the secondary element. If, for example, a handle aid is attached to the upper clamping element in the form of a collar, the secondary element can be easily pulled off above it.

In an alternative embodiment, the first end face may be closed with the filter medium. Thus, regardless of whether the support tube on the opposite side of the outlet is closed or open, ensures a fluid-tight seal the clean side of the outlet of the filter system, so even when replacing the filter element no dirt particles in the outlet of the filter system and thus possibly in the intake an internal combustion engine can get.

Advantageously, the filter medium is formed of a non-woven or of paper or of cellulose or of a mixed fiber of plastic and cellulose. Favorable in any case flexible filter media, which also have a certain moisture resistance, which favors the stability especially when used in construction and agricultural machinery. Advantageously, the filter medium is elastic, so that it can be pulled easily over the support body and rests against the support body.

Advantageously, the filter medium can be designed to be endless on the circumference of the secondary element with at least one seam. As a result, flat surfaces of filter media can be used for the production of the secondary element, which are mounted on a corresponding molding and welded to a seam, for example, to a continuous web, whereby the tightness of the secondary element is given.

According to a further aspect, the invention relates to a filter system comprising a housing, an inlet connection arranged on the housing for supplying a fluid to be filtered, in particular air, an outlet connection arranged on the housing for discharging the filtered fluid, at least one filter element arranged between inlet and outlet is, with a seal arrangement, the one Separates raw side of a clean side of the filter element, and comprises a arranged in the interior of the housing along a housing axis support tube. In this case, the support tube is provided as a carrier of a secondary element, wherein the secondary element comprises a filter medium arranged around the longitudinal axis.

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

The filter medium is preferably flexible, in particular elastic. In a favorable embodiment of the filter body of the filter element may for example consist of a zigzag folded (pleated) filter bellows and be designed closed ring. The folding can be produced for example by knife folding, for longer filter body, or rotational folding. The filter bellows may for example consist of paper or cellulose or of a mixed fiber of plastic and cellulose. The filter bellows can be designed with a smooth surface, rolled and / or designed in different embossing molds shaped surface for stiffening and / or creation of cavities for dust deposition. The filter bellows may have a coating and / or impregnation to repel moisture. It may alternatively be coated with nanofibers. The filter body may further be structurally stiffened with a filament winding. 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 system 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 system as a particle filter, in particular as a particle filter of an internal combustion engine. Again, the safe installation and economic interchangeability of the filter element described are of crucial importance.

Advantageously, a collar for receiving the lower clamping element of the secondary element can be provided on the support tube. This can be prevented that the secondary element during operation of the filter system, for example, by vibrations too far on the support tube can slide down and the secondary element is fixed.

Conveniently, the collar may comprise a latching connection with which the secondary element can be fixed via the end ring with the support tube. By a possible locking a firm and secure connection between the secondary element and the support tube can be created so that the secondary element can not be detached from its seat in operation and even with replacement of the filter element can not be accidentally pulled out, creating dirt particles on the clean side could arrive.

In an advantageous embodiment, the filter element, in particular the seal arrangement, have a receiving ring corresponding to the receptacle, whereby the assembly of the secondary element in the housing is verifiable. For example, the receptacle may be designed so that the filter element can only assume its actual seat in the housing of the filter system when the secondary element is installed, otherwise the height is not correct, for example, so that it is immediately apparent during assembly of the filter element whether the secondary element is properly installed at its position is.

Advantageously, the secondary element can be mounted with the mounting aid on the support tube or disassembled from the support tube. Since the secondary element is constructed of a flexible filter medium without actually supporting element, it is expedient if the secondary element is to be pulled over the support tube down to its operating position via the mounting aid or to be deducted again from the support tube during disassembly.

Conveniently, the secondary element can remain in the housing when changing the filter element. This ensures that the clean side of the outlet is also effectively protected from penetrating dirt particles.

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 secondary element according to an embodiment of the invention;

2 a perspective view of a support tube of a filter system with a removed secondary element according to an embodiment of the invention;

3 an exploded view of a filter system with filter element and secondary element according to an embodiment of the invention;

4 a schematic longitudinal section through a arranged on a support tube secondary element according to an embodiment of the invention;

5 a perspective view of a filter system according to an embodiment of the invention;

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 secondary element 28 according to an embodiment of the invention. The secondary element 28 with a longitudinal axis L and two end faces 54 . 56 comprises a filter medium arranged around the longitudinal axis L. 58 , It is on the front side 56 an opening 30 provided, wherein on the first end face 54 an upper clamping element 32 and at the second end face 56 a lower clamping element 34 is arranged, and the secondary element 28 with the opening 30 on a support tube 14 a filter system 100 attachable. In this case, the upper and lower clamping element 32 . 34 be designed as seals, wherein the upper clamping element 32 and / or the lower clamping element 34 an elastic round cord, such as an O-ring include. Alternatively, the lower clamping element 34 also a closing ring 36 include.

As in 1 is recognizable, is the diameter of the upper clamping element 32 less than the diameter of the lower clamping element 34 , so that the secondary element 28 in a clear position over the support tube 14 to draw is.

The filter medium 58 of the secondary element 28 can be formed from a non-woven or paper or cellulose or from a mixed fiber of plastic and cellulose. In any case, a flexible filter medium is advantageous, since the secondary element 28 so easily over the support tube 14 a filter system 100 to draw is. The filter medium is useful 58 on the perimeter of the secondary element 28 with at least one seam 26 Run endless, so the necessary tightness of the secondary element 28 when replacing the filter element 10 to ensure.

2 shows a perspective view of a support tube 14 a filter system 100 with a detached secondary element 28 according to an embodiment of the invention. The secondary element 28 , in the operating state via the support tube 14 in the case 108 of the filter system 100 is fixed, is pushed, is in 2 deducted to the top. To mount it, it will be with the opening 30 down over the support tube 14 pushed. It is doing with the lower clamping element 34 holding a closing ring 36 includes, guided down until the upper end face 54 with the support tube 14 closes up. Then also lies the upper clamping element 32 close to the support tube 14 on and the secondary element 28 is firmly mounted. The first front page 54 may have a second opening as shown, or alternatively with the filter medium 58 to be introverted.

The end ring 36 can be an assembly aid 38 (not shown) for mounting / dismounting of the secondary element 28 include. Alternatively, the upper clamping element 32 a grip aid 44 (not shown) for disassembly of the secondary element 28 provide.

In 3 is an exploded view of a filter system 100 with filter element 10 and secondary element 28 to see according to an embodiment of the invention. The filter system 100 includes a housing 108 , one on the housing 108 arranged inlet nozzle 102 for supplying a fluid to be filtered, in particular air, on the housing 108 arranged outlet 104 for discharging the filtered fluid, a filter element 10 that between inlet 102 and outlet 104 is arranged, with a seal arrangement 22 , which is a raw side of a clean side of the filter element 10 separates, as well as one inside 120 of the housing 108 along a housing axis L arranged support tube 14 for receiving a filter element 10 , Here is the support tube 14 as a carrier of a secondary element 28 provided, wherein the secondary element 28 a flexible filter medium disposed about the longitudinal axis L. 58 includes. The secondary element 28 remains when changing the filter element 10 in the case 108 ,

In 3 is above the case 108 in which the support tube 14 is fixed, the removed secondary element 28 to see and about that filter element 10 , During assembly, conversely, only the secondary element 28 over the support tube 14 pushed and if it is firmly mounted in its seat, the filter element 10 introduced into the housing, which then over the end plate 18 of the filter element 10 with tension locks 60 (not shown) is closed and sealed.

The filter element 10 , in particular the seal arrangement 22 , one may be the end ring 36 have corresponding receptacle, whereby the assembly of the secondary element 28 in the case 108 , For example, about the height of the built-filter element 10 in the case 108 , is verifiable.

4 shows a schematic longitudinal section through a on a support tube 14 arranged secondary element 28 according to an embodiment of the invention. The section is shown as a pure schematic drawing to show the basic structure. On average, the filter medium 58 of the secondary element 28 to recognize that on the support tube 14 is applied. The secondary element 28 has an upper clamping element 32 with a round cord, for example, in a loop of the filter medium 58 can be welded by ultrasonic welding. This loop can also be in the form of a grip aid 44 be designed. At the bottom is the secondary element 28 through a lower clamping element 34 completed, to which a closing ring 36 for example, is welded and in a snap-in connection 24 , which for example via a counter element on the support tube 14 has, can engage.

On the support tube 14 can also be a bunch 20 for receiving the lower clamping element 34 of the secondary element 28 be provided. The Bund 20 can continue a locking connection 24 include, with which the secondary element 28 over the end ring 36 with the support tube 14 can be fixed.

The secondary element 28 can with one on the end ring 36 attached mounting aid 38 , For example in the form of a handle collar, on the support tube 14 mountable or from the support tube 14 be dismantled.

5 shows a perspective view of a filter system 100 according to an embodiment of the invention with tangential inlet 102 and centric outlet 104 on a housing front side. Shown is a round filter design, consisting of a housing 108 exists, with a clamping arrangement 110 , for example, via fasteners 60 , is closed. The housing 108 in this case has a removable cover over which the filter element and optionally the secondary element are interchangeable. Alternatively, the filter element as in 3 have a closed end plate, which simultaneously acts as a lid and the mounting hole in the housing 108 closes.

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 is displaced by a flow protection on the filter element in a rotational movement. Filter element and Anströmschutz are not shown in the drawing. The purified air can through the centric outlet 104 out of the case 108 be dissipated.

The filter element 10 can be used as an air filter, in particular as an air filter of an internal combustion engine. In principle, however, a use as a particle filter in a similar design is conceivable.

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

• US 8480778 B2 [0006]

Claims (15)

Secondary element ( 28 ) with a longitudinal axis (L) and two end faces ( 54 . 56 ) comprising a filter medium arranged around the longitudinal axis (L) ( 58 ), wherein at least one of the two end faces ( 54 . 56 ) an opening ( 30 ) is provided, wherein at the first end face ( 54 ) an upper clamping element ( 32 ) and at the second end face ( 56 ) a lower clamping element ( 34 ), wherein the secondary element with the opening ( 30 ) on a support tube ( 14 ) of a filter system ( 100 ) is attachable. Secondary element according to claim 1, wherein the upper and the lower clamping element ( 32 . 34 ) is designed in each case as a seal. Secondary element according to claim 1 or 2, wherein the upper clamping element ( 32 ) and / or the lower clamping element ( 34 ) comprises an elastic round cord. Secondary element according to one of the preceding claims, wherein the lower clamping element ( 34 ) a closing ring ( 36 ). Secondary element according to one of the preceding claims, wherein a diameter of the upper clamping element ( 32 ) is less than a diameter of the lower clamping element ( 34 ). Secondary element according to claim 4, wherein the end ring ( 36 ) an assembly aid ( 38 ) for mounting / dismounting of the secondary element ( 28 ). Secondary element according to one of the preceding claims, wherein the upper clamping element ( 32 ) a grip aid ( 44 ) for disassembly of the secondary element provides. Secondary element according to one of the preceding claims, wherein the first end face ( 54 ) with the filter medium ( 58 ) is closed. Secondary element according to one of the preceding claims, wherein the filter medium ( 58 ) is formed from a non-woven or paper or cellulose or from a mixed fiber of plastic and cellulose. Secondary element according to one of the preceding claims, wherein the filter medium ( 58 ) is flexible. Secondary element according to one of the preceding claims, wherein the filter medium ( 58 ) on the circumference of the secondary element with at least one seam ( 26 ) is executed endlessly. Filter system ( 100 ) - a housing ( 108 ), - one on the housing ( 108 ) arranged inlet port ( 102 ) for supplying a fluid to be filtered, in particular air, - one at the housing ( 108 ) arranged outlet ( 104 ) for discharging the filtered fluid, - at least one filter element ( 10 ) between inlet ( 102 ) and outlet ( 104 ) is arranged with a sealing arrangement ( 22 ), which is a raw side of a clean side of the filter element ( 10 ) separates, - an inside ( 120 ) of the housing ( 108 ) along a housing axis (L) arranged support tube ( 12 ), wherein the support tube ( 12 ) as a carrier of a secondary element ( 28 ) is provided, wherein the secondary element ( 28 ) a filter medium arranged around the longitudinal axis (L) ( 58 ). Filter system according to claim 12, wherein on the support tube ( 14 ) A bunch ( 20 ) for receiving the lower clamping element ( 34 ) of the secondary element ( 28 ) is provided. Filter system according to claim 12 or 13, wherein the collar ( 20 ) a locking connection ( 24 ), with which the secondary element ( 28 ) via the closing ring ( 36 ) with the support tube ( 14 ) is fixable. Filter system according to claim 12 to 14, wherein the filter element ( 10 ), in particular the sealing arrangement ( 22 ) one the end ring ( 36 ) has corresponding receptacle, whereby the assembly of the secondary element ( 28 ) in the housing ( 108 ) is ensured.

Images