DE102023100040A1 - In-line filter element and filter system with an in-line filter element - Google Patents

Abstract

The invention relates to an inline filter element (10) for installation between an upstream inlet (112) and a downstream outlet (116) of a housing (110), in particular a tubular one, with a tubular filter bellows (12) which has an interior (30) surrounds and extends along a longitudinal axis (40), and which has a smaller outer diameter (32) at an axial first end (14) than at its axially opposite second end (16) and a larger one at its second end (16). Inner diameter (34) than at its first end (14). The filter bellows (12) has a closed end plate (42) at the first end (14), which closes the interior (30) of the filter bellows (12) and a sealing ring (44) at the second end (16) on its outer circumference (26). . Outwardly directed fold tips (18) of the filter bellows (12) protrude beyond the end plate (42) in cross section. The invention also relates to a filter system (100) with such a filter element (10).

Description

technical field

The invention relates to an inline filter element and a filter system with an inline filter element.

State of the art

US 5,125,940A discloses a device having an in-line filter element with an air cleaner housing disposed in an engine air intake of an internal combustion engine. The inline filter element is tubular and has a closed axial end upstream and an open axial end downstream. The open end has a size and shape that generally corresponds to the size and shape of the intake manifold. The closed end has an annular air inlet portion surrounding the closed upstream end that directs air longitudinally and inwardly through the bladder of the tubular air filter element.

Disclosure of Invention

An object of the invention is to provide a filter element with a reduced pressure drop.

Another object of the invention is to specify a compact filter system with such a filter element.

The above objects are achieved according to one aspect of the invention with an inline filter element for installation between an upstream inlet and a downstream outlet of a, in particular tubular, housing, with a tubular filter bellows, which surrounds an interior space and extends along a longitudinal axis, and the has a smaller outside diameter at an axial first end than at its axially opposite second end, and which has a larger inside diameter at its second end than at its first end, the filter bellows having a closed end disk at the first end, which closes the interior of the filter bellows and the second end has a sealing ring on its outer periphery. The tips of the folds of the filter bellows pointing outwards protrude beyond the cross-section of the end plate.

According to a further aspect of the invention, the objects are achieved by a filter system with an inline filter element, with a, in particular tubular, housing for, in particular exchangeable, accommodation of the filter element between an upstream inlet and a downstream outlet of the housing.

Favorable configurations and advantages of the invention result from the further claims, the description and the drawing.

According to one aspect of the invention, an inline filter element is proposed for installation between an upstream inlet and a downstream outlet of a housing, in particular a tubular one, with a tubular filter bellows, which surrounds an interior space and extends along a longitudinal axis, and which is attached to an axial first end has a smaller outside diameter than at its axially opposite second end, and which has a larger inside diameter at its second end than at its first end, the filter bellows having a closed end disk at the first end, which closes the interior of the filter bellows and at the second End has a sealing ring on its outer circumference. The tips of the folds of the filter bellows pointing outwards protrude beyond the cross-section of the end plate.

A compact design of a filter system is advantageously possible. A large filter area is available due to the fact that the outward-facing fold tips of the filter bellows protrude beyond the end plate in cross-section. A fluid to be filtered can enter between the pleats and pass through the filter bellows. The interior of the filter element can advantageously represent a clean side of the filter element and the exterior a dirty side. A reverse arrangement is optionally conceivable, in which the fluid to be filtered enters the interior as the unfiltered side of the filter element and exits to the outside. A distance between the housing wall and the outer circumference of the filter element can therefore be selected to be relatively small.

According to a favorable configuration of the filter element, the filter bellows can be pleated about the longitudinal axis, with fold tips extending along the longitudinal axis. Fluid to be filtered can pass through the filter bellows along the folds.

According to a favorable configuration of the filter element, the filter bellows can have a truncated cone-shaped segment at the first end. The spaces between the folds can serve as flow channels through which the fluid to be filtered can flow. In this segment, outward-pointing pleat tips can be folded inwards. The end plate can reliably seal the clean side against the dirty side. The fluid to be filtered can flow reliably through the filter bellows.

According to a favorable configuration of the filter element, the filter bellows can have a segment with an inner circumference in the shape of a truncated cone at the second end. In this segment, pleat tips pointing inwards can be folded outwards. The sealing ring protrudes axially beyond the filter bellows, so that an axial seal is possible and the clean side can be reliably sealed against the dirty side. The fluid to be filtered can reliably flow through the filter bellows without leakage.

According to a favorable configuration of the filter element, the sealing ring can engage on the outer circumference of the filter bellows between the tips of the folds of the filter bellows. In particular, the sealing ring can only engage from the outside between the tips of the folds. A large filter area of the filter bellows is available with a correspondingly favorable pressure loss.

According to a favorable configuration of the filter element, the end disk can be cup-shaped at the first end. In particular, the pot-shaped end disk can protrude into the interior of the filter bellows. Due to the pot-like shape, the filter element can be easily supported and stably positioned when installed in a housing. If the pot-shaped end disk protrudes into the interior of the filter bellows, a support element can engage in the corresponding cavity of the end disk from the outside. This is particularly favorable when the filter element is installed in a horizontal position during operation of the same.

According to a favorable configuration of the filter element, the end disk and/or the sealing ring can be formed from polyurethane foam. This enables a reliable and tested connection between the folds of the filter bellows and the polyurethane foam.

According to a favorable configuration of the filter element, a support structure extending along the longitudinal axis can be connected to the sealing ring and/or the end plate. In this way, the filter element can be stabilized and positioned in different installation positions.

According to a further aspect, a filter system is proposed with an inline filter element according to the invention, with a housing for accommodating the filter element between an upstream inlet and a downstream outlet of the housing. The housing can advantageously be tubular and enclose the filter element relatively tightly. Advantageously, the filter element can be provided in an exchangeable manner in the housing. Favorably, the housing pot and/or housing cover can end in a pipe socket.

A compact and small-sized filter system can be achieved by the advantageous positioning of the sealing ring on the outside at one end of the filter element and the positioning of the end disk within the outer diameter of the filter element.

According to a favorable configuration of the filter system, the filter element can face the inlet with its axial first end and the outlet with its opposite second end. The fluid to be filtered advantageously flows along the folds of the filter element to the interior space, which is surrounded by the filter bellows and which then forms the clean side. If the filter element is arranged in reverse, the interior of the filter element can form the raw side.

According to a favorable embodiment of the filter system, the filter element can be arranged in a housing pot which is closed with a housing cover. The sealing ring can advantageously be used to position the filter element in the housing pot. Advantageously, the sealing ring can be conical for this purpose, so that the filter element with the sealing ring can dip into the open end of the housing pot and be positioned by the sealing ring.

According to a favorable embodiment of the filter system, the housing pot can have an outwardly folded bead which is at least partially covered by an edge of the housing cover. In this way, a stable, in particular form-fitting connection of the housing cover to the housing pot can be achieved.

According to a favorable embodiment of the filter system, the housing cover can be detachably connected to the housing pot. In particular, the housing cover can be separated from the housing pot in a non-destructive manner and, if necessary, closed again. The housing cover can advantageously be connected to the housing pot with a bayonet lock. A screw connection can optionally be provided. A clamp connection can optionally be provided. The type of connection can easily be adapted to the intended use of the filter system.

In alternative embodiments, the filter element can have a circular, oval, triangular, rectangular or polygonal cross-section transversely to the longitudinal direction. The cross section of the filter element can change in the longitudinal direction, in particular a conical shape or an ent have a cross-section that tapers along any contour.

It is advantageously possible to arrange a plurality of filter elements parallel to one another in order to increase the flow of the fluid to be filtered.

The fluid to be filtered can be a gas, such as air, or a liquid, such as oil or fuel.

character list

• 1 eine perspektivische Darstellung eines Filterelements nach einem Ausführungsbeispiel der Erfindung;
• 2 eine Seitenansicht eines Filtersystems nach einem Ausführungsbeispiel der Erfindung mit angedeuteter Schnittebene III-III;
• 3 eine Schnittdarstellung des Filtersystems aus 2;
• 4 in Explosionsdarstellung das Filtersystem mit Filterelement nach 2 mit Gehäusetopf und Gehäusedeckel;
• 5 das Filtersystem mit in den Gehäusetopf eingesetztem Filterelement mit abgehobenem Gehäusedeckel; und
• 6 eine Anordnung von mehreren parallelen Filterelementen nach einem Ausführungsbeispiel der Erfindung.

Further advantages result from the following description of the drawing. Exemplary embodiments of the invention are shown in the drawings. 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 further meaningful combinations. Examples show:

• 1 a perspective view of a filter element according to an embodiment of the invention;
• 2 a side view of a filter system according to an embodiment of the invention with indicated section plane III-III;
• 3 A sectional view of the filter system 2 ;
• 4 the filter system with filter element in an exploded view 2 with housing pot and housing cover;
• 5 the filter system with the filter element inserted into the housing pot and the housing cover lifted off; and
• 6 an arrangement of several parallel filter elements according to an embodiment of the invention.

Embodiments of the invention

In the figures, the same or similar components are denoted by the same reference symbols. The figures only show examples and are not to be understood as limiting.

To explain the invention shows 1 a perspective view of a filter element 10 according to an embodiment of the invention.

The filter element 10 is tubular as a so-called inline filter element 10 which is provided for installation between an upstream inlet and a downstream outlet of a housing.

The filter element 10 has a tubular filter bellows 12 which surrounds an interior space 30 and extends along a longitudinal axis 40 . The filter bellows 12 is pleated about the longitudinal axis 40 , with fold tips 18 extending along the longitudinal axis 40 . In this case, outward-pointing fold tips 18, only some of which are numbered with a reference number, lie on an outer circumference and inward-pointing fold tips on an inner circumference of the filter bellows 12.

The cross section of the filter element 10 is circular in this example. However, the filter element 10 can also have other cross sections, for example oval, triangular, rectangular, polygonal, as required.

At an axial first end 14, the filter element 10 has a smaller outer diameter 32 than at its axially opposite second end 16. The filter bellows 12 has a frustoconical segment 20 correspondingly at the first end 14.

At its second end 16, the filter element 10 has a larger inside diameter than at its first end 14. At the second end 16, the filter bellows 12 has a segment 24 with an inner circumference 28 in the shape of a truncated cone.

Between the end segments 20, 24, the filter element 10 has a straight or cylindrical segment 22 which runs parallel to the longitudinal axis 40 and in which the fold edges pointing inward and outward are arranged parallel to one another.

The filter element 10 has a closed end disk 42 at the first end 14 which closes the interior space 30 of the filter bellows 12 .

At the second end 16 the filter element 10 has a sealing ring 44 on its outer circumference 26 . The sealing ring 44 engages from the outside between the folds of the filter bellows 12 and has a relatively large axial extent. The axial extent essentially corresponds to the axial extent of the segment 24 , the sealing ring 44 projecting beyond the filter bellows 12 with an upper edge 46 .

The end plate 30 and/or the sealing ring can be formed from polyurethane foam.

2 shows a side view of a filter system 100 according to an embodiment of FIG Invention with indicated sectional plane III-III, corresponding to the sectional view in 3 .

The filter system 100 has a housing 110 with a housing pot 120 and a housing cover 122 . The filter element 10 dips almost completely into the housing pot 120 except for an upper edge 46 of the sealing ring 44 which protrudes beyond the filter bellows 12 and protrudes from the filter pot 120 . The upper edge 46 of the sealing ring 44 forms an axial seal of the filter element 10 against the housing cover 122. The sealing ring 44 on the outer circumference of the filter element 10 positions the filter element 10 in the housing pot 120.

The housing pot 120 has a socket 114 which has, for example, an inlet 112 for a fluid to be filtered.

The housing cover 122 ends in a socket 118 which has, for example, an outlet 116 for the filtered fluid.

The housing pot 120 has, at its end facing the housing cover 122 , a bead 124 which is folded over to the outside and on which the housing cover 122 rests with an edge 126 and covers the bead 124 . The connection between the housing cover 122 and the housing pot 120 can be a simple clamp connection or, if necessary, can be designed, for example, as a bayonet connection or screw connection. In this way, the filter element 10 can be replaced if necessary.

The direction of flow of the fluid between the inlet 112 and outlet 116 of the filter system 100 is indicated by bold block arrows.

As can be seen in the figure, the end disk 42 is cup-shaped at the first end 14 and protrudes into the interior space 30 of the filter bellows 12 . With a horizontal installation position of the filter system, this allows the filter element to be positioned in the longitudinal axis by a suitable support element being able to engage in the cavity of the cup-shaped end disk 42 .

Furthermore, a support structure 36 can be arranged between the sealing ring 44 and the end plate 42, which stabilizes the filter bellows 12. The support structure 36 can be foamed into the end plate 42 and the sealing ring 44, for example, especially if they are made of polyurethane foam. The support structure 36 essentially extends over the straight segment 22 of the filter element 10.

4 shows the filter system 100 with the filter element 10 in an exploded view 2 with housing pot 120 and housing cover 122, and 5 shows the filter system 100 with the filter element 10 inserted into the housing pot 120 with the housing cover 122 lifted off.

6 shows an arrangement of several, for example five, filter elements 100 arranged parallel to one another according to an exemplary embodiment of the invention.

This arrangement allows the filter capacity to be increased, with the respective filter system 100 being able to be designed as a small-sized standard element and being able to provide a desired filter performance by combining several identical parts.

Reference List

10

filter element

12

filter bellows

14

first end

16

second end

18

wrinkle tips

20

segment

22

segment

24

segment

26

outer perimeter

28

inner circumference

30

inner space

32

outer diameter

34

outer diameter

36

support structure

40

longitudinal axis

42

end plate

44

sealing ring

100

filter system

110

Housing

112

Entry

114

Support

116

Exit

118

Support

120

housing pot

122

housing cover

124

flare

126

edge

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was 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.

Patent Literature Cited

• US5125940A [0002]

Claims (13)

Inline filter element (10) for installation between an upstream inlet (112) and a downstream outlet (116) of a, in particular tubular, housing (110), with a tubular filter bellows (12) which surrounds an interior space (30) and extends along a longitudinal axis (40), and which has a smaller outer diameter (32) at an axial first end (14) than at its axially opposite second end (16), and which has a larger inner diameter (34) at its second end (16) than at its first end (14), wherein the filter bellows (12) has a closed end disk (42) at the first end (14) which closes the interior (30) of the filter bellows (12) and at the second end (16) on its outer circumference (26) a sealing ring (44) having, outwardly directed fold tips (18) of the filter bellows (12) protrude beyond the end plate (42) in cross section. filter element after claim 1 , wherein the filter bellows (12) is pleated about the longitudinal axis (40), wherein fold tips (18) extend along the longitudinal axis (40). filter element after claim 1 or 2 wherein the filter bellows (12) has a frusto-conical segment (20) at the first end (14). Filter element according to one of the preceding claims, wherein the filter bellows (12) has at the second end (16) a segment (22) with a frustoconical inner circumference (28). Filter element according to one of the preceding claims, wherein the sealing ring (44) on the outer circumference (26) of the filter bellows (12) engages between the fold tips (18) of the filter bellows (12), in particular only from the outside between the fold tips (18). Filter element according to one of the preceding claims, wherein the end plate (42) is pot-shaped at the first end (14), in particular wherein the pot-shaped end plate (42) projects into the interior (30) of the filter bellows (12). Filter element according to one of the preceding claims, wherein the end plate (30) and/or the sealing ring (44) are formed from polyurethane foam. Filter element according to one of the preceding claims, wherein a support structure (36) extending along the longitudinal axis (40) is connected to the sealing ring (44) and/or the end plate (42). Filter system (100) with an inline filter element (10) according to one of the preceding claims, with a, in particular tubular, housing (110) for, in particular exchangeable, receiving the filter element (10) between an upstream inlet (112) and a downstream outlet (116) of the housing (110). filter system after claim 9 , wherein the filter element (10) faces the inlet (112) with its axial first end (14) and the outlet (116) with its opposite second end (16). filter system after claim 9 or 10 , wherein the filter element (10) is arranged in a housing pot (120) which is closed with a housing cover (122). filter system after claim 11 , wherein the housing pot (120) has an outwardly folded bead (124) which is at least partially covered by an edge (126) of the housing cover (122). Filter system according to one of Claims 11 until 12 , wherein the housing cover (122) is detachably connected to the housing pot (120).

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