DE202014004898U1 - Obliquely flowed filter element - Google Patents

Abstract

Filter element (20) for a filter, in particular for internal combustion engines, for filtering a fluid, in particular air, with a multiply folded filter medium (23), wherein the folds (24) of the filter medium (24) have a folding edge (25) and an end face ( 26, 27), so that the filter element (20) has at least two opposite Faltkantenflächen (28, 30) and a first end face (29) and an opposite second end face (31), wherein the first end face (29) with at least a folding edge surface (28) adjoining the first end face (29) forms the clean side of the filter element (20) with at least one other folded edge surface (30), with adjacent folds (24) of the first end face (29 ) the one end faces (26) are closed and in adjacent folds (24) of the second end face (31), the other end faces (27) are closed, so there ss no direct fluid flow connection along a fold (24) between the raw side and the clean side may arise, the filter medium (23) receiving the filter element frame (21) with a clean side of the filter element (20) from the raw side of the filter element (20) separating the sealing surface ( 22), wherein the sealing surface (22) passes around the filter element (20).

Description

Technical area

The present invention relates to a filter element for a filter, in particular for internal combustion engines, for filtering a fluid, in particular air, and a filter with such a filter element.

State of the art

Particularly in construction and agricultural machinery, engine air filtration is becoming increasingly important. On the one hand, more and more efficient air filters are being used, as higher engine outputs and stricter emission standards require increased air flow through the engine. On the other hand, the number of assemblies installed as standard, such as air conditioning systems, is increasing. This reduces the available space in the vehicle. Finally, there is a desire to make vehicles smaller and lighter, which is also at the expense of the available space.

For use in vehicles that offer little space for filtration purposes, so-called compact air filter with mutually closed channels are generally used, which can be traversed in a straight line, such as in the US2004221555A1 shown. This means that the inflow direction and the outflow direction are parallel and substantially aligned with one another. This is usually achieved in that alternately wavy and smooth layers of filter medium lie on one another and the flow channels thus formed are alternately closed at one end and at the other, so that the medium to be cleaned within the filter body by a layer of filter medium from a channel into a must flow adjacent channel. Often, the air flowing out of the air filter must be deflected depending on the application after flowing through the filter. For this purpose, for example, a pipe bend can be connected downstream of the filter housing. However, such downstream components in turn increase the space requirement of the entire arrangement.

It is an object of the invention to provide a filter, in particular for internal combustion engines, for filtering a fluid, in particular air, which requires less space with comparable filter performance.

Disclosure of the invention

The object is achieved by a filter element according to independent claim 1. Further embodiments of the invention are specified in the dependent claims.

The filter element according to the invention for a filter, in particular for internal combustion engines, for filtering a fluid, in particular air, has a multiply folded filter medium. The folds of the filter medium have a folding edge and a front side. The filter element has at least two opposite Faltkantenflächen and first and second opposite end faces. The first end face forms, with at least one fold edge surface adjoining the first end face, the raw side of the filter element and the second end face with at least one other fold edge face forms the clean side of the filter element. The distinction between the first and second end face is for explanation only. In adjacent folds of the first end face, the end faces are closed on one side of the filter medium and in adjacent folds of the second end face, the end faces are closed on the other side of the filter medium. Thus, there can be no direct fluid flow connection along a crease between the raw side and the clean side. The filter element further comprises a filter element frame receiving the filter medium. The filter element frame has a sealing surface which separates the clean side of the filter element from the raw side of the filter element in an installed state of the filter element. The sealing surface runs around the filter element. Due to the possibility of realizing an inflow of an end face and a folded edge surface with the folded filter medium or to realize an outflow over an end face and a folded edge surface, a particularly variable diversion possibility of the fluid flow is already achieved in the filter with significantly reduced space requirement. Depending on the design of the filter housing surrounding the filter element, an in-line flow, a deflection of the flow by 90 ° and, depending on the structural design and any intermediate angle can be easily realized without changing the geometry of the filter element. Rather, one and the same filter element can be used for different fluid flow guides.

Another advantage of the particularly variable arrival or Abströmmöglichkeiten is an optimal utilization of the filter capacity of the filter element. The possibility of premature closure of individual filter bags before reaching the maximum filter bag capacity is minimized, since even with non-uniform loading of the filter bag can be exploited by the free Anströmbarkeit the maximum capacity.

A preferred embodiment of the invention provides that the first end face and the at least one adjoining fold edge surface is inflow face / outflow face, and the second face side face and / or the at least one other adjoining fold edge face are outflow face / inflow face.

A development of the invention provides that the effective direction of the sealing surface extends in the direction of the main flow direction of the filter element. This causes a particularly high sealing effect, especially with vibrations, manufacturing tolerances or foreign bodies on the sealing surface.

Advantageously, the basic shape of the filter element is a prism and the sealing surface extends diagonally along the base and top surfaces of the prism. In particular, the base and the top surface are formed as squares, for example as a rectangle, in particular as a square. The diagonal course of the sealing surface allows an inflow of the filter element over two lateral surfaces of the prismatic basic shape and a total diagonal flow through the filter element. Alternatively, with a 45 ° inflow of the diagonal sealing surface, a deflection of the flow direction within the filter element can be achieved. This means a space optimization, since no further fluid guide means are necessary for a deflection.

Thus, in one embodiment, the sealing surface may include a 45 ° angle with the main inflow direction of the filter element.

In an embodiment according to the invention, it can also be provided that the sealing surface extends perpendicular to the main flow direction of the filter element. This arrangement results from the ability to flow both folded edge surfaces and end faces of the folded filter medium, resulting in a total diagonal flow through the filter element. The diagonal arrangement of the sealing surface in turn results in a substantially right angle between the main flow direction of the filter element and the sealing surface.

The inventive concept is also found in a filter according to claim 8 again. Further embodiments of the filter are specified in the dependent claims. The filter according to the invention, in particular for internal combustion engines, for filtering a fluid, in particular air, has a main filter element according to the invention as well as a filter housing with a housing part which has a throughflow opening, wherein the housing part can be fastened to the filter housing in two orientations. In a first orientation of the housing part, the throughflow opening is arranged at a front side surface and in a second orientation at a folded edge surface. It is thus possible regardless of the direction of flow of the filter housing, set by attaching the housing part in different orientations, the outflow from the filter housing in two different directions. This opens in particular large manufacturing advantages. By using the same housing part in two different orientations can be realized in a very late manufacturing step using identical components, for example, an inline flow or a deflection of the fluid flow by 90 ° without further deflection components outside the housing or different housing parts would be necessary.

An advantageous embodiment of the invention provides that the housing part can be fastened to a separating surface of the filter housing. In particular, it is advantageous if the separating surface encloses a 45 ° angle with the main flow direction. The 45 ° angle corresponds to the diagonal arrangement of the sealing surface of the filter element and at the same time allows a particularly easy realization of the two possible orientations of the housing part on the filter housing.

In one embodiment of the invention, it is provided that the filter stream has a secondary filter element downstream of the main filter element. The secondary filter element can in particular be designed as a flat folded flat element.

Brief description of the drawings

The invention will now be explained in more detail with reference to the drawings. Show it:

1 3 a perspective front view of a filter according to the invention in a first configuration,

2 a rear view of the filter of 1 .

3 a sectional view of the filter of 1 .

4 an exploded view of the filter 1 ;

5 a front perspective view of the filter according to the invention 1 in a second configuration,

6 a rear view of the filter of 5 .

7 a sectional view of the filter of 5 ;

8th a perspective view of a filter element according to the invention,

9 a perspective sectional view of the filter of 8th .

10 another perspective sectional view of the filter of 8th ;

11 a front perspective view of a secondary filter element of the filter of 1 .

12 a rear view of the filter of 11 ,

Embodiment (s) of the invention

The 1 to 4 show an embodiment of a filter according to the invention 10 in a first configuration. The filter 10 has a filter housing 12 on. The filter housing 12 includes a housing cover 60 , a cyclone block flowed along a main flow direction X 50 , a filter housing base 14 , An attachable to the filter housing base Abströmgehäuseteil 16 through which the fluid leaves the filter housing. A discharge nozzle 18 is integral with the discharge housing part 16 attached and sets the main outflow direction Z fixed.

Into the filter housing base 14 is a main filter element 20 can be used, which is flowed through along a main flow direction Y. In the outflow housing part 16 is a secondary filter element 40 used.

The cyclone block 50 has a variety of cyclone cells 51 on, which are connected in parallel and to a multi-cyclone block 50 are summarized. The filtered out of the inflowing fluid material such as dust and / or water is removed via a Staubaustragsstutzen from the filter housing 12 away. The cyclone block 50 serves as a pre-separator and removes most of the fluid entrained material.

After the cyclone block 50 the pre-cleaned fluid enters the filter housing base 14 and flows through the main filter 20 , Before exiting the filter housing 12 over the outflow housing part 16 the fluid passes through the secondary filter element 40 , In the in the 1 to 4 shown first configuration results in an inline flow through the filter 10 that is, the fluid flow experiences essentially no deflection. The flow directions X, Y and Z are parallel and lie substantially on a straight line.

The filter housing base 14 takes the main filter element 20 and has a prismatic basic shape, wherein the top and bottom surface of the prism have a substantially triangular shape. The main filter element 20 has a substantially cuboidal basic structure and has a diagonal circumferential sealing surface 21 , The main filter element 20 is described below with reference to the 8th to 10 be explained in more detail.

The circumferential sealing surface 21 is at a 45 ° angle to the main flow direction Y of the filter in the present embodiment 10 arranged. The sealing surface 21 contacted in the inserted state, a corresponding housing sealing surface 19 , Between both sealing surfaces 21 . 19 is a seal 22 arranged. This can either be on the main filter element 20 or on the housing sealing surface 19 be arranged. In this way creates a separation between the clean side and the raw side of the main filter element 20 , The filter housing base 14 is essentially unfiltered, the outflow housing part 16 on the other hand, it is essentially clean. To when changing the main filter element 20 contamination of air ducts downstream of the filter 10 to avoid is in the outflow housing part 16 in a corresponding recording 17 the secondary filter element 40 arranged. The secondary filter element 40 is described below with reference to the 11 and 12 be explained in more detail.

The lid 60 has one of the oblique sealing surface 21 of the main filter element 20 adapted double sword structure 61 on, from in 4 only a part of the couple can be seen. When assembled, the lid exercises 60 over the sword structure 61 a vertical - in 4 vertical - acting on the main flow direction Y force on the sealing surface 21 out and presses the filter element 20 into the filter housing base 14 , in particular against the housing sealing surface 19 , Due to the oblique arrangement of the sealing surface 21 This force component ensures a particularly good seal between the raw side and the clean side even under vibration or in the case of foreign bodies or bumps in the sealing area.

In the in the 1 to 4 In the embodiment shown, the main flow direction X, the main filter element flow direction Y and the main flow direction Z are in line. There is no deflection of the main fluid flow. The main outflow direction Z is substantially parallel to the main flow direction X.

In the 5 to 7 is an alternative configuration of the filter 10 of the 1 to 4 shown. For the same or similar features, like reference numerals are used. In contrast to the embodiment of the 1 to 4 is in the 5 to 6 the outflow housing part 16 rotated by 180 ° on the filter housing base 14 attached. As a dividing plane 15 at which the outflow housing part 16 with the filter housing base 14 is connected, has a shape that is invariant with respect to a rotation through 180 °, such a 180 ° rotation is easily possible. In the present embodiment of the invention is thus from an in-line flow through the filter, shown in the 1 to 4 , a deflection of the fluid flow direction Y by 90 °. The deflection of the fluid flow from the main flow direction X to the main outflow direction Z takes place exclusively by the changed orientation of the outflow housing part 16 at the interface 15 , In both embodiment configurations, the same parts are always used. Also the main filter element 20 and the secondary filter element 40 are the same components. The attachment of the Abströmgehäuseteils 16 on the filter housing base 14 can like the configuration of the 1 to 4 be carried out using common fastening technologies such as welding, riveting, gluing or the like.

In the 8th to 10 is the main filter element 20 shown in more detail. The filter element 20 has a filter element frame 22 on, which is the main filter element medium 23 carries as well as a sealing surface 21 for sealing. The sealing surface is in the representation of 8th on the underside of the filter element frame 22 , In the present embodiment, a flat gasket is circumferentially on the filter element frame 22 on the sealing surface 21 appropriate. The seal may for example be made of sponge rubber. The direction of action of the seal is axial, that is, it acts substantially in the direction of the main flow direction of the filter element 20 , The filter element medium 23 is a substantially cuboidal bellows that has a variety of folds 24 having. In the in 8th In the embodiment shown, the filter medium is folded perpendicular to the main flow direction X. In 8th are the individual folding edges 25 . 37 the folds 24 arranged vertically. The front ends 26 . 27 the folds 24 are parallel to the main flow direction X and run according to 8th horizontal. To those for the filter 10 To allow for flow and Abströmvariabilität are the front sides 26 . 27 the folds 24 mutually closed. This can for example be realized that in the manufacturing process after embossing the fold edges 25 . 37 but before putting up the wrinkles 24 , Glue strips are applied to the filter medium. For the one end 26 a glue strip is applied to one side of the filter medium. At the other end 27 the fold 24 the application of the glue strip takes place on the other side of the filter medium. In this way, no direct flow along the fold 24 from the raw side to the clean side and the fluid must pass through the filter medium. As a filter medium, for example, a suitable paper material can be used. As a result, thus the filter element 20 on the one hand by a folded edge surface 28 , which by the multiplicity of folding edges 25 the folds 24 is formed to be flown. This happens in 8th along the Hauptanströmungsrichtung X. On the other hand, the filter element 20 be flowed along the flow direction X '. The fluid meets there on an end face 29 , which by the multiplicity on end sides 26 the folds 24 is formed. It thus form the Faltkantenfläche 28 as well as the front side surface 29 Flow surfaces for the filter medium 20 , The above also applies to the downstream surfaces. This results in the present embodiment, a downstream Faltkantenfläche 30 , formed by the upstream of the folding edges 37 , as well as a downstream end face 31 formed by the end faces 27 ,

In the 9 and 10 is the mutual closing of the front sides 26 . 27 shown. In 9 is the inside of a fold 24 , the folding bag 33 to see. The inflow-side bend area 35 the fold 24 , in which the cut has been made for the representation, is shown hatched. The folding bag 33 that are within the fold 24 is present in the present 9 an outflow bag. A glue strip 34 is for closing adjacent faces 26 intended. At the same time is at the opposite end 27 no glue strip provided, so that from the end faces 27 formed end face 31 serves as a discharge surface. 10 shows the corresponding reverse case. Here is the section for the representation by the downstream part of the fold 24 , the hatched area shown hatched 36 , The glue strip 34 is at the in 9 bottom side shown below 27 appropriate. In the 10 top side shown above 26 , which the front side 27 is opposite, is free and can be flowed, causing the fluid in the filter bag 33 arrives.

The 11 and 12 show two different views of the secondary filter element 40 , The secondary filter element 40 points as a filter medium 41 a straight folded bellows on. A filter element frame 42 surrounds the filter element medium 41 and stabilizes the bellows. On the filter element frame 42 All around is a seal 43 attached. This can be, for example, polyurethane. The effective direction of the seal 43 is radial.

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 2004221555 A1 [0003]

Claims (10)

Filter element ( 20 ) for a filter, in particular for internal combustion engines, for filtering a fluid, in particular air, with a multiply folded filter medium ( 23 ), the wrinkles ( 24 ) of the filter medium ( 24 ) a folding edge ( 25 ) and an end face ( 26 . 27 ), so that the filter element ( 20 ) at least two opposite Faltkantenflächen ( 28 . 30 ) and a first end face ( 29 ) and an opposite second end face ( 31 ), wherein the first end face ( 29 ) with at least one of the first end face ( 29 ) adjacent fold edge surface ( 28 ) the raw side and the second end face ( 31 ) with at least one other folded edge surface ( 30 ) the clean side of the filter element ( 20 ), with adjacent folds ( 24 ) of the first end face ( 29 ) one end faces ( 26 ) are closed and adjacent folds ( 24 ) of the second end face ( 31 ) the other end faces ( 27 ) are closed, so that no direct fluid flow connection along a fold ( 24 ) between the raw side and the clean side, the filter medium ( 23 ) receiving filter element frame ( 21 ) with a clean side of the filter element ( 20 ) from the raw side of the filter element ( 20 ) separating sealing surface ( 22 ), wherein the sealing surface ( 22 ) around the filter element ( 20 ) running. Filter element according to claim 1, wherein the first end face ( 29 ) and the at least one adjacent folded edge surface ( 28 ) Are inflow and the second end face ( 31 ) and / or the at least one other adjacent folded edge surface ( 30 ) Are outflow surface. Filter element according to claim 1, wherein the first end face and the at least one adjacent Faltkantenfläche Abströmfläche and the second end face and / or the at least one other adjacent Faltkantenfläche are inflow surface. Filter element according to one of the preceding claims, wherein the effective direction of the sealing surface ( 22 ) in the direction of the main flow direction (Y) of the filter element (FIG. 20 ) runs. Filter element according to one of the preceding claims, wherein the basic shape of the filter element ( 20 ) is a prism and the sealing surface ( 22 ) runs diagonally along the base and top surfaces of the prism. Filter element according to one of the preceding claims, wherein the sealing surface ( 22 ) with the main direction of flow (X) of the filter element ( 20 ) includes a 45 ° angle. Filter element according to one of the preceding claims, wherein the sealing surface ( 22 ) perpendicular to the main flow direction (Y, Y ') of the filter element ( 20 ) runs. Filter ( 10 ), in particular for internal combustion engines, for filtering a fluid, in particular air, with a main filter element ( 20 ) according to one of the preceding claims, a filter housing ( 12 ) with a housing part ( 16 ), which has a flow opening ( 18 ), wherein the housing part ( 16 ) in two orientations on the filter housing ( 12 ) is fastened, wherein in a first orientation of the housing part ( 16 ) the flow opening ( 18 ) at a front side surface ( 31 ) and in a second orientation at a folded edge surface ( 30 ) is arranged. Filter according to claim 8, wherein the housing part ( 16 ) at a separating surface ( 15 ) of the filter housing ( 12 ) is fastened, wherein the separating surface ( 15 ) with the main direction of flow of the filter housing (X) includes a 45 ° angle. Filter according to one of claims 8 or 9, wherein the filter ( 10 ) downstream of the main filter element ( 20 ) a secondary filter element ( 40 ), in particular a straight folded flat element ( 40 ).

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