DE202013011867U1 - Filter system with support tube - Google Patents

Abstract

Filter system (100) comprising - a housing (108) with a housing wall (112) and at least one cover (110), - an inlet connection (102) arranged on the housing (108) for supplying a fluid to be filtered, in particular air, - one on the housing (108) arranged outlet pipe (104) for draining the filtered fluid, - a support tube (12) arranged in the interior (10) of the housing (108) for receiving a filter element, the support tube (12) extending along a housing axis (L) and is connected to the housing (108) via a snap-in connection (14) on a receiving side (16).

Description

Technical area

The invention relates to a filter system with a support tube for receiving a replaceable filter element, in particular for use as an air filter of an internal combustion engine.

State of the art

From the WO 2008/045326 A2 An air filter system is known which has as part of the filter system housing via a support tube having a closed end plate. The support tube carries the filter element and prevents twisting of the filter element during operation of the filter system. The support tube is connected via retaining lugs which engage in openings of the housing, with this via a snap connection. When the retaining lugs are snapped into the openings, the support tube may be considered part of the housing. Thus, it is possible to use the support tube for receiving the filter element, which is thereby arranged torsion-proof. The support tube can be released after removal of the filter element from this snap connection, for example, by tilting the support tube against the housing, which is intentionally or unintentionally possible in an exchange of the filter element.

An object of the invention is therefore to provide a filter system with a support tube, in which the support tube is connected in a simple and cost-effective manner firmly and against rotation with the housing.

The above objects are achieved according to one aspect of the invention with a filter system having a support tube which is connected via a latching connection with the housing.

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 system is proposed, wherein the filter system comprises a housing with a housing wall and at least one cover, 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, and one inside the housing arranged support tube for receiving a filter element comprises. In this case, the support tube extends along a housing axis and is connected via a latching connection on a receiving side with the housing.

The solution according to the invention has the advantage over the prior art that the latching connection has a fixed, d. H. non-destructively releasable, and at the same twist-proof arrangement of a support member in the housing of a filter system allows. Next is also an angular coupling between the housing-fixed support tube and the housing, as well as between a secondary element and the housing-fixed support tube conceivable as a further embodiment.

Accidental removal of the support tube when replacing filter elements is not possible in contrast to a detachable connection without destroying the component. A rotation of the support tube in vibrational excitations, for example, during operation on an internal combustion engine in a motor vehicle, is not possible due to the Verdrehschutzes.

An angular coupling between both the housing and the support tube as well as between a secondary element and the support tube can be provided, whereby a clear position of these three components housing, support tube and secondary element is ensured to each other. As a result, in particular the quality of the signal of an air mass sensor such as a Heißfilmuftmassenmessers (HFM), in the clean air area of the filter system by the constant flow field in the clean air area, which could otherwise be influenced by a changed geometry of the relative positions of the housing, support tube and / or secondary element to each other, be improved. Typically, measurements with HFM sensors are made very close to the outlet of a filter system, so that the measurements can be greatly influenced by a different flow field. If now structural components of a filter system such as support tube and / or secondary element, which are usually not completely rotationally symmetrical, for example, by seams of filter media, stiffening ribs and the like, installed in different angular positions, the resulting flow field can be different and thus the measurement of Influence HFM sensor.

Preferably, the latching connection may be formed of corresponding locking elements on the housing and on the support tube. In this way, a clear assignment of support tube and housing is possible, so that the risk of incorrect parts being used during assembly is minimized.

Particularly advantageous may have the effect that the latching connection is not designed to be destructive detachable. As a result, a manipulation or incorrect operation, for example, when exchanging a filter element on the filter system easily to recognize. Also, the need to apply higher forces reduces the likelihood of accidentally removing the support tube, thereby reducing inadvertent contamination of the clean air area during filter element replacement.

In an advantageous embodiment may be provided as part of the locking connection an at least segmentally trained circumferential collar and at least one collar directed to the retaining lug. Through the interaction of retaining lug and circumferential collar with the respective corresponding locking elements of the respective other participating in the locking connection component, such as housing and / or support tube, a secure connection between the support tube and the housing can be made.

Advantageously, the retaining lug can have a holding surface, which is arranged perpendicular to the housing axis. As a result, a relatively high force is required to release the retaining lug from a locking position again and it is possible to represent a reliable connection between the components involved. The retaining lugs have expediently insertion bevels so that they can be easily guided over their corresponding locking element. Due to the vertical arrangement of the support surfaces but a non-destructive release of the latched connection is no longer possible.

Conveniently, the housing may have as part of the latching connection on an at least segmentally formed circumferential collar at least one inwardly directed retaining lug having a holding surface which is arranged perpendicular to the housing axis. By locking the retaining lug with a retaining lug and a circumferential collar of the support tube, a secure connection between the support tube and the housing can be made.

As a corresponding latching element, the support tube may have as part of the latching connection on a peripheral collar an outwardly directed retaining lug with a holding surface which is perpendicular to the housing axis and wherein the support tube has a securing element, whereby a securing of the latching connection against loosening is effected. By locking the retaining lug with a retaining lug and a circumferential collar of the housing, a secure connection between the support tube and the housing can be made, which is also secured against unintentional release by a securing element.

In an alternative embodiment, the latching elements of the housing and support tube may be mirror-inverted, so that the support tube has as part of the latching connection on a peripheral collar at least one inwardly directed retaining lug with a holding surface which is perpendicular to the housing axis.

Correspondingly, the housing may have as part of the latching connection on a peripheral collar an outwardly directed retaining lug with a holding surface, which is arranged perpendicular to the housing axis and further, the housing may have a securing element, whereby a securing of the latching connection against loosening is effected. This embodiment of the latching connection works in exactly the same way as described above and has only reversed corresponding latching elements.

Advantageously, in the solution according to the invention, the support tube can be axially angularly mounted relative to the housing axis. The locking elements can be designed so that each corresponding locking elements can be locked together only in a fixed manner, for example, by different distances of the locking elements on a circumferential collar, and so can be mounted only in an angular direction. As a result, the support tube according to the so-called Poka Yoke principle can only be mounted in a fixed and always the same position in the housing.

In a favorable embodiment, at least one alignment element can be arranged on the receiving side of the support tube and a counter element can be arranged on the housing, whereby a torsion protection of the support tube mounted in the housing can be displayed. By means of such an alignment element, for example a rib, which corresponds only to its corresponding mating element, for example a groove, a fixed angularly correct mounting of the support tube can be realized. The support tube can be installed according to the Poka Yoke principle only in one position. In addition, the support tube can not turn in its installed position. If the alignment element does not engage in its corresponding counter-element, then, for example, the support tube can not lock in the latching connection. In this way, the assembly can be secured in a defined angular position.

In addition, the anti-rotation can be further realized by the interlocking of ribs on the receiving side of the support tube with webs on the collar of the housing wall by the ribs engage during insertion and locking of the support tube in the housing between the webs of the housing and are protected against rotation.

In an advantageous embodiment, a secondary element may be arranged in the interior of the support tube and the secondary element along extend the housing axis and be connected via a latching connection with the support tube and / or housing. The secondary element can be connected with a similar latching connection as the support tube to the housing with the support tube itself and so are also performed easily and safely mountable. In this case, it is possible to dispense with the securing element if the secondary element is to be designed to be exchangeable during maintenance processes.

By attaching the secondary element in the interior of the support tube, the secondary element can be prevented from falling out in case of maintenance when removing the filter element with or unintentionally pulled out with. In this way, clean air area of the air duct system of an internal combustion engine is protected against contamination when changing the filter element.

Conveniently, the secondary element can be axially angularly mounted relative to the housing axis and / or the support tube. By appropriate design of the locking elements with different distances can be achieved even in the secondary element that it can only be mounted in a fixed angular position. The secondary element can be obstructed according to the Poka Yoke principle only in one position.

Advantageously, at least one alignment element can be arranged on a receiving side of the secondary element and a counter element can be arranged on the support tube, whereby a rotation protection of the secondary element mounted in the housing and / or in the support tube can be represented. By means of such an alignment element, which only corresponds with its corresponding counter element, a fixed angle-appropriate mounting of the secondary element can be realized. In addition, the secondary element can no longer rotate in its installed position. If the alignment element does not engage in its corresponding counter-element, for example, the lid of the filter system can not be closed because the secondary element presses on the lid. In this way, the assembly can be secured in a defined angular position.

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 two-stage filter system with a cyclone separator according to an embodiment of the invention;

2 a longitudinal section of the filter system of 1 with inserted support tube;

3 a detailed view of the locking connection between the support tube and housing according to an embodiment of the invention;

4 a detailed view of the locking elements of the housing according to an embodiment of the invention;

5 a perspective view of the locking elements of the housing according to an embodiment of the invention;

6 a support tube with locking elements according to an embodiment of the invention;

7 a perspective view of the locking elements of the housing according to an embodiment of the invention;

8th a detailed view of the locking elements of the housing according to an embodiment of the invention;

9 a housing of a filter system with the cover removed and mounted support tube according to an embodiment of the invention;

10 a housing of a filter system with the cover removed and mounted support tube and secondary element according to an embodiment of the invention;

11 a secondary element according to an embodiment of the invention; and

12 a longitudinal section through a housing of a filter system with the cover removed and mounted support tube and secondary element 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 two-stage filter system 100 with a cyclone separator 50 according to an embodiment of the invention with tangential inlet 102 , centric outlet 104 on a housing front side 124 and bottom dirt outlet 106 , Shown is a round filter design, consisting of a housing 108 which is a housing wall 112 has and 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 is displaced by a flow protection on the filter element in a rotational movement. Filter element and Anströmschutz are not shown in the drawing. Due to the cyclone effect caused by the rotational movement of the air, centrifugal forces act on the dust particles of the flowing air, so that they partly deposit on the housing wall and via 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.

Such filter systems, as in 1 are usually used as air and / or particulate filter, in particular for internal combustion engines 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.

In 2 is a longitudinal section of the filter system 100 from 1 with inserted support tube 12 shown. The filter system 100 includes a housing 108 with housing wall 112 and a lid 110 , 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 the discharge of the filtered fluid, as well as an inside 10 of the housing 108 arranged support tube 12 for receiving a filter element. In this case, the support tube extends 12 along a housing axis L and is via a latching connection 14 on a recording page 16 with the housing 108 connected.

3 shows a detailed view of the locking connection 14 between support tube 12 and housing 108 according to an embodiment of the invention, wherein the latching connection 14 from corresponding locking elements 18 . 20 . 24 . 26 on the housing 108 and on the support tube 12 is formed. As part of the locking connection 14 is an at least segmentally trained circumferential collar 18 . 24 and at least one to the fret 18 . 24 directed retaining lug 20 . 26 intended. The retaining lugs 20 . 26 each have a holding surface 22 . 28 which is arranged perpendicular to the housing axis L. The housing 108 points as part of the locking connection 14 on an at least segmentally formed circumferential collar 18 at least one inward retaining lug 20 with a holding surface 22 which is arranged perpendicular to the housing axis L. Corresponding to this, the support tube 12 as part of the locking connection 14 on a rotating waistband 24 an outwardly directed retaining lug 26 with a holding surface 28 which is arranged perpendicular to the housing axis L. Next, the support tube 12 a fuse element 30 on, thereby securing the locking connection 14 against loosening is effected. Such executed locking connection 14 is not nondestructive solvable, since the fuse element 30 due to the stiction prevents the retaining lug 20 can be easily bent outwards.

In an alternative, but not shown embodiment, the locking elements between housing and support tube can be reversed, so that the support tube 12 as part of the locking connection 14 on a rotating waistband 18 at least one inward retaining lug 20 with a holding surface 22 has, which is arranged perpendicular to the housing axis L. The housing then corresponds correspondingly 108 as part of the locking connection 14 on a rotating waistband 24 an outwardly directed retaining lug 26 with a holding surface 28 which is arranged perpendicular to the housing axis L. Next, the housing 108 then a fuse element 30 on, thereby securing the locking connection 14 against loosening is effected.

4 shows a detailed view of the locking elements 18 . 20 . 22 of the housing 108 according to an embodiment of the invention. Shown are immediately near the outlet 104 on the housing wall 112 attached retaining lugs 20 with holding surfaces 22 , which is on a circumferential collar 18 are arranged.

In 5 is a perspective view of the locking elements 18 . 20 . 22 of the housing 108 illustrated according to an embodiment of the invention. So it can be seen that the immediately near the outlet 104 on the housing wall 112 attached retaining lugs 20 with their retaining surfaces 22 circular on the encircling collar 18 are arranged. At the federal government 18 are more bridges 44 attached, in which ribs 46 a support tube 12 can engage, so as to provide additional protection against rotation of the built-in support tube 12 to ensure.

6 shows a support tube 12 with the locking elements 24 . 26 . 28 and the fuse element 30 according to an embodiment of the invention. At the reception side 16 of the support tube 12 are on the orbiting fret 24 retaining lugs 26 with their retaining surfaces 28 arranged. Below the retaining nose 26 is at a distance the fuse element 30 for securing the locking connection against unintentional release. At the receiving end of the support tube 12 is an alignment element 32 arranged, which for fixed angularly mounted mounting of the support tube 12 in the case 108 serves. The support tube 12 is so axially angularly mounted relative to the housing axis L. At the reception side 16 of the support tube 12 is at least one alignment element 32 arranged and on the housing 108 is a counter element 33 arranged, whereby both an angular mounting and a rotation of the housing 108 mounted support tube 12 is representable. An additional protection against twisting is the interlocking of ribs 46 at the reception side 16 of the support tube 12 with bars 44 at the federal government 18 the housing wall 112 realized.

7 shows a perspective view of the locking elements 18 . 20 . 22 of the housing 108 according to an embodiment of the invention. The locking elements holding nose 20 with holding surface 22 are on an encircling fret 18 arranged at regular intervals, with the retaining lugs 20 at one point a greater distance as a counter element 33 namely, where the alignment element 32 of the support tube 12 can engage the support tube 12 angularly mounted.

In 8th is another perspective detail view of the locking elements 18 . 20 . 22 of the housing 108 represented according to an embodiment of the invention, so that the spatial arrangement of the Federal 18 with the retaining lugs 20 and holding surfaces 22 can be seen more clearly.

9 shows a housing 108 a filter system 100 with the lid removed 110 and mounted support tube 12 according to an embodiment of the invention. The support tube 12 is concentric with the longitudinal axis L of the filter system 100 inside the housing wall 112 arranged. The support tube 12 has at its upper end a counter element 41 for the angular mounting of a secondary element 36 based on the poka yoke principle.

In 10 is still a case 108 a filter system 100 with the lid removed 110 and mounted support tube 12 and secondary element 36 illustrated according to an embodiment of the invention. The secondary element 36 is inside 34 of the support tube 12 arranged and extends along the housing axis L. The secondary element 36 is via a locking connection 38 with the support tube 12 and / or housing 108 connected and via the connection of alignment element 40 and counter element 41 relative to the housing axis L and / or the support tube 12 axially angularly mounted.

11 shows a secondary element 36 according to an embodiment of the invention. At the upper end of the secondary element 36 is as an alignment element 40 for angular alignment in the support tube 12 to recognize a projecting rib. At a reception side 42 of the secondary element 36 is at least one alignment element 40 arranged, with a counter element 41 , For example, a groove on the support tube 12 is arranged, whereby an angle-directed mounting and a rotation of the housing 108 and / or in the support tube 12 mounted secondary element 36 is representable.

12 shows a longitudinal section through a housing 108 a filter system 100 with the lid removed 110 and mounted support tube 12 and secondary element 36 according to an embodiment of the invention. Internally 10 of the filter system 100 is the support tube 12 via a locking connection 14 on the housing wall 112 above the outlet 104 mounted while the secondary element 36 internally 34 of the support tube 12 via a locking connection 38 is arranged, wherein the secondary element 36 over the alignment element 40 , For example, a rib, and its counter element 41 , For example, a groove in the support tube 12 angularly mounted.

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

• WO 2008/045326 A2 [0002]

Claims (14)

Filter system ( 100 ) - a housing ( 108 ) with housing wall ( 112 ) and at least one lid ( 110 ), - 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 the discharge of the filtered fluid, - an inside ( 10 ) of the housing ( 108 ) arranged support tube ( 12 ) for receiving a filter element, wherein the support tube ( 12 ) extends along a housing axis (L) and via a latching connection ( 14 ) on a recording side ( 16 ) with the housing ( 108 ) connected is. Filter system according to claim 1, wherein the latching connection ( 14 ) from corresponding locking elements ( 18 . 20 . 24 . 26 ) on the housing ( 108 ) and on the support tube ( 12 ) is formed. Filter system according to claim 1 or 2, wherein the latching connection ( 14 ) is not designed to be destructively detachable. Filter system according to one of the preceding claims, wherein as part of the latching connection ( 14 ) an at least segmentally formed circumferential collar ( 18 . 24 ) and at least one to the Bund ( 18 . 24 ) directed retaining nose ( 20 . 26 ) is provided. Filter system according to claim 4, wherein the retaining lug ( 20 . 26 ) a holding surface ( 22 . 28 ), which is arranged perpendicular to the housing axis (L). Filter system according to one of the preceding claims, wherein the housing ( 108 ) as part of the latching connection ( 14 ) on an at least segmentally formed circumferential collar ( 18 ) at least one inwardly directed retaining nose ( 20 ) with a holding surface ( 22 ), which is arranged perpendicular to the housing axis (L). Filter system according to one of the preceding claims, wherein the support tube ( 12 ) as part of the latching connection ( 14 ) on a rotating collar ( 24 ) an outwardly directed retaining lug ( 26 ) with a holding surface ( 28 ), which is arranged perpendicular to the housing axis (L) and wherein the support tube ( 12 ) a fuse element ( 30 ), whereby a securing of the latching connection ( 14 ) is effective against loosening. Filter system according to one of claims 1 to 6, wherein the support tube ( 12 ) as part of the latching connection ( 14 ) on a rotating collar ( 18 ) at least one inwardly directed retaining nose ( 20 ) with a holding surface ( 22 ), which is arranged perpendicular to the housing axis (L). Filter system according to claim 8, wherein the housing ( 108 ) as part of the latching connection ( 14 ) on a rotating collar ( 24 ) an outwardly directed retaining lug ( 26 ) with a holding surface ( 28 ), which is arranged perpendicular to the housing axis (L) and wherein the housing ( 108 ) a fuse element ( 30 ), whereby a securing of the latching connection ( 14 ) is effective against loosening. Filter system according to one of the preceding claims, wherein the support tube ( 12 ) relative to the housing axis (L) axially angularly mountable. Filter system according to one of the preceding claims, wherein at least one alignment element ( 32 ) on the recording side ( 16 ) of the support tube ( 12 ) and wherein a counter element ( 33 ) on the housing ( 108 ), whereby a torsion protection of the housing ( 108 ) mounted support tube ( 12 ) can be displayed. Filter system according to one of the preceding claims, wherein inside ( 34 ) of the support tube ( 12 ) a secondary element ( 36 ) and wherein the secondary element ( 36 ) extends along the housing axis (L) and via a latching connection ( 38 ) with the support tube ( 12 ) and / or housing ( 108 ) is connectable. Filter system according to one of the preceding claims, wherein the secondary element ( 36 ) relative to the housing axis (L) and / or the support tube ( 12 ) is axially angularly mountable. Filter system according to one of the preceding claims, wherein at least one alignment element ( 40 ) on a recording side ( 42 ) of the secondary element ( 36 ) and wherein a counter element ( 41 ) on the support tube ( 12 ), whereby a torsion protection of the housing ( 108 ) and / or in the support tube ( 12 ) mounted secondary element ( 36 ) can be displayed.

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