WO2015075050A1

WO2015075050A1 - Filter device

Info

Publication number: WO2015075050A1
Application number: PCT/EP2014/074970
Authority: WO
Inventors: Matthias Krohlow
Original assignee: Mann+Hummel Gmbh
Priority date: 2013-11-19
Filing date: 2014-11-19
Publication date: 2015-05-28
Also published as: DE102014017024A1

Abstract

A filter device comprises a filter insert which can be inserted into a filter housing and which includes a filter element and a locking element that is to be put in an interlocked position with a mating locking element in the filter housing. The locking element and the mating locking element are designed as a locking recess and a locking projection, respectively. The locking recess has an introducing section for introducing the locking projection as well as a locking section for securing the locking projection.

Description

description

Filtering device Technical field

The invention relates to a filter device, in particular a gas filter, according to the preamble of claim 1.

State of the art

Gas filters are known with a filter insert which is insertable into a filter housing and has a U-shaped filter element, which is traversed radially from outside to inside by the fluid to be filtered (EP 2 152 385 B1). Between the two legs of the U-shaped filter element is the clean room, from which the filtered gas is discharged axially via a discharge opening, which is located at the end faces of the legs and is integrated in a cover plate.

Also known are cylindrical filter elements, which are flowed through radially from outside to inside and enclose an internal outflow space, from which the cleaned fluid is discharged axially. At the end faces of the cylindrical filter elements are end plates, in one of the end plates, a discharge opening is introduced in order to derive the fluid axially into a secondary channel.

When installing the filter device, make sure that the filter insert or filter element is firmly seated in the female housing. The tight fit can be achieved, for example, by means of latching elements on the filter insert and the interior of the filter housing.

Disclosure of the invention

The invention is based on the object with simple constructive measures to lock a filter insert in a filter device safely in the filter housing.

This object is achieved with the features of claim 1. The dependent claims indicate expedient developments. The invention relates to filter devices for the filtration of a fluid, in particular to gas filters such as air filters for internal combustion engines, with which the combustion air to be supplied to the cylinders of the internal combustion engine is subjected to a filtration. In principle, however, an application for liquid filtration is possible, for example, for the filtration of oil or fuel in motor vehicles.

The filter device comprises a filter housing with a receiving space therein and a filter insert which can be inserted into the receiving space in the filter housing. The filter insert has a filter element made of a filter medium or agent, for example a filter paper, and a discharge opening on the end face of the filter element, via which the cleaned fluid is removed from the filter element after it has flowed through the filter medium. The discharge opening is located on the clean side of the filter element and communicates in the installed position with corresponding openings or pipes or channels for the discharge of the purified fluid.

For locking or latching of the filter insert in the filter housing is a locking device with a latching element on the filter element and a Gegenrast- element on the filter housing or a component connected to the filter housing. With the insertion of the filter insert into the associated receptacle in the filter housing, the latching element and the counter-latching element engage, so that the filter insert is securely latched in the filter housing.

The latching element and the counter-latching element are designed as a latching recess and latching projection which are to be brought into engagement with each other. The latching recess has an insertion section, into which the latching projection is inserted, and a latching section, which serves to set the latching projection. The latching projection is first used for producing the latching connection in the insertion section and then transferred transversely to the direction of insertion from the insertion section into the latching section until the latching position is reached. The insertion direction of the Rastvor- jump in the recess and the adjustment of the locking projection within the locking recess from the insertion into the locking portion are perpendicular to each other. It is thus a combination of two movements to reach the detent position. Advantageously, the insertion of the latching projection into the insertion section of the latching recess is identical to the insertion movement of Filter insert into the filter housing, so that the latching projection is automatically in the insertion of the recess as soon as the filter insert is inserted into the filter housing. Subsequently, the filter insert must be adjusted transversely to the insertion direction within the filter housing, so that the latching projection from the insertion section into the latching portion of the recess.

This design can be relatively easily constructive and also provides a high level of security against accidental release of the filter cartridge from the detent position. The locking position is maintained over a long period of operation and even with vibration and shock.

To remove the filter insert again from the filter housing, the filter insert must first be moved from the latching section into the insertion section in reverse order, after which the filter insert can be removed and the latching projection is removed from the insertion section.

The latching recess is preferably located on the filter insert, whereas the latching projection is arranged on the filter housing or a component to be connected to the filter housing. However, it is also possible a reverse arrangement, in which the latching recess on the filter housing or a component connected to the filter housing and the latching projection are arranged on the filter insert.

According to another expedient embodiment, the latching element is located on the filter insert on the clean side. However, it is also possible to position the latching element on the raw side of the filter insert.

In the case of an arrangement on the clean side of the filter insert and in the embodiment as a latching recess, it is expedient to separate the latching recess in a flow-tight manner from the clean side so that no undesired flow can occur between the raw and clean sides, bypassing the filter element. The latching recess is designed, for example, as a hollow foot, which serves to receive the latching projection. The hollow base has walls delimiting on the circumference, via which the interior of the hollow foot is separated from the outside in a flow-tight manner. The cleaned fluid is, according to a further advantageous embodiment, derived via a clean-side arranged discharge pipe, which may be part of the filter cartridge. The recess designed as a hollow foot can protrude into the discharge pipe and is at the same time separated from the discharge pipe in a flow-tight manner. If necessary, two locking projections can be introduced from opposite sides into the hollow foot, which are fixedly connected to the filter housing or to a housing cover to be placed on the filter housing. The latching projections on the filter housing or housing cover protrude from different sides into the hollow foot which is open on both sides and can optionally be connected to one another, for example by means of a screw.

In the latching recess, according to further expedient recess, introduced between the insertion section and the latching portion lateral guide webs. These form lateral boundaries in the transfer of the locking projection from the insertion to the locking portion. Preferably, the transfer path tapers from the insertion section in the direction of the latching section, so that during assembly the transfer into the latching position can be carried out with little effort, but after reaching the latching position the latching projection is held with high latching force. In order to remove the latching projection from its locking position, it must be moved back from the latching section into the insertion section, for which purpose the latching force must be overcome. This is largely determined by the geometry of the recess, in particular the lateral guide webs between insertion and locking portion, as well as the material of the recess, which is preferably plastic. Due to the inherent elasticity of the guide webs, these deviate laterally as soon as the locking force is overcome.

The filter element can have at least one flattened section, which has a reduced radial thickness and extends immediately adjacent to the outflow opening along the circumference of the outflow opening, relative to the longitudinal axis of the outflow opening. Thus, the filter element has a reduced thickness along a defined angular segment along the outflow opening. Optionally, the thickness can be reduced to zero, so that an opening in the filter element is present, which also extends over a defined angular segment along the circumference of the discharge opening. This embodiment has the advantage that based on the outer dimensions of the filter element, a relatively large outflow opening for discharging the filtered fluid is present, which is associated with a reduced flow resistance on the clean side of the filter element. The reduced flow resistance downstream of the filter element increases the cleaning efficiency, so that even with smaller sized filter elements predetermined requirements for a specific cleaning performance can be met.

Brief description of the drawings

Further advantages and expedient embodiments can be taken from the further claims, the description of the figures and the drawings. Show it:

1 is a perspective view of a filter device with a filter insert in a receiving space of a filter housing, wherein the filter element has two arranged on a discharge pipe, diagonally opposite filter elements with U-shaped cross-section and the outlet pipe is connected to a housing neck on the filter housing,

2 shows the filter device according to FIG. 1 from a different perspective,

3 shows the filter device in plan view, partly in section,

4 shows the filter device in a side view with a representation of the housing neck for the discharge of the cleaned fluid,

5 shows a section through the filter device,

6 is an enlarged view of the detail VI of FIG. 5, FIG. 7 is an enlarged view of the detail VII of FIG. 5,

8 shows a section through the filter device, wherein the filter insert in the filter housing is in the unlocked state, 9 shows a locking device for locking the filter insert in the filter housing, with an insert-side hollow foot as a latching element and a housing-side latching projection as a counter-latching element, shown in the unlocked state,

Fig. 10, the locking device of Fig. 9 in the locked state. In the figures, the same components are provided with the same reference numerals. Embodiments of the invention

In Figures 1 and 2, a filter device 1 is shown in a perspective view, which is designed as an air filter for an internal combustion engine and in a receiving space 3 in a filter housing 2 has a filter cartridge 4 for filtration of the supplied combustion air. The filter insert forms a structural unit and comprises two filter elements 5 and an outflow pipe 6. The two filter elements 5 are arranged on diagonally opposite sides of the outflow pipe 6 and each have an approximately U-shaped cross-section. Optionally, V-shaped cross sections of the filter elements come into consideration. The filter elements 5 are respectively flowed through radially from the outside to the inside - in the direction of the outflow pipe 6 - by the fluid to be filtered. In the wall of the outflow pipe 6 flow openings are introduced, which are in communication with the clean side of the filter elements 5, so that the fluid passes through the flow openings in the outflow pipe 6 after filtration and is discharged axially via the outflow pipe 6. In the outflow tube 6 and / or in the filter elements 5, one or more Strömungsleitapparate may be arranged to guide the fluid.

On the outer wall of the filter housing 2, a housing stub 7 is arranged, which encloses a recess in the housing wall and with which the outflow pipe 6 is connected. The frontal opening of the discharge pipe 6 forms the discharge opening 8, which rests directly on the housing stub 7. On the opposite side of the outlet of the housing stub 7, a channel or pipe for discharging the purified fluid can be connected. In the embodiment as an air filter, the outlet pipe 6 as part of the filter element 4 and the housing neck part of the Form intake line through which the cylinders of the internal combustion engine are supplied with fresh air.

As can be seen in particular from FIG. 3, the filter element 5 has a support frame 9, which is the carrier of the filter medium or medium, through which the fluid to be filtered flows. The filter element 5 has approximately U-shape, wherein the free end faces of the legs of the U-shape abut against the lateral surface of the outflow pipe 6. Accordingly, the rounded U-shape lies on the side facing away from the outflow pipe 6.

The legs of each U-shaped filter element 5 surround an intermediate clean room, which communicates via the flow openings in the wall of the outflow pipe 6 with the interior of the outflow pipe. The front side, the filter elements 5 and thus the intermediate clean room of end plates 10 and 1 1 are closed. On the opposite side of the discharge opening 8, the end plate 10 also closes the rear opening of the outflow pipe 6.

The diameter of the outflow pipe 6 and the outflow opening 8, which corresponds to the clear diameter of the outflow pipe on the downstream side, is approximately equal to the height of the filter element 5. The filter elements 5 do not completely surround the outflow pipe 6, but allow two angular segments along the Umström-. fangs the outflow pipe 6 free. The free end faces of the U-shaped filter elements 5 abut against the outer wall of the outflow pipe 6, wherein an angle segment of each filter element 5 on the outer circumference of the outflow pipe 6 is less than 180 °, for example approximately 90 ° covered.

The height of the filter cartridge 4 is significantly smaller than the width or length of the filter cartridge. The height is in particular at most half as large as the width and / or the length of the filter cartridge. The same applies to the dimensions of the receiving space 3 in the filter housing 2 for receiving the filter insert 4th

As can be seen from the sectional representation according to FIG. 5 and the detailed illustrations according to FIGS. 6 and 7, the receiving space 3 in the filter housing 2 is to be closed by a detachable housing cover 12. To the housing socket 7, in a Recess is inserted in the filter housing 2, a line 13 is connected, via which the cleaned fluid is discharged. Via the outflow opening 8, which forms the end face of the outflow pipe 6, an insertion part 14 is inserted into the outflow pipe 6, whose length, however, is less than the length of the outflow pipe 6. The line 13 is designed as a stub, which is formed integrally with the insertion part 14 is, wherein the nozzle 14 protrudes axially only slightly above the outflow opening 8 of the outflow pipe 6 and has a smaller diameter than the line 13 overall. The insertion part 14 has over its axial length a changing diameter which, starting from the end region lying immediately outside the outflow opening, initially decreases continuously and widens in a tulip shape on the opposite end face, which protrudes into the outflow pipe 6. By means of the plug 14 can be influenced on the noise behavior and possibly also on the flow behavior. As can be seen from the enlarged illustration according to FIG. 6, a knurling or a groove section 15 can be arranged on the front end region of the outflow pipe 6, with which the outflow pipe 6 is inserted into the larger-sized housing connecting piece 7, whereby a sufficiently strong and flow-tight connection between the downstream side of the outflow pipe 6 and the housing stub 7 is achieved. Also, on the outer surface of the nozzle-shaped conduit 13, which is formed integrally with the insertion part 14, a corresponding knurling or groove portion may be arranged, which is overlapped by a further portion of the housing stub 7. If necessary, this knurling or the groove section can also be designed as a separate component, which is arranged between the outer jacket surface of the stub-shaped line 13 and the inside of the housing stub 7.

In the discharge pipe 6, a hollow base 16 (Fig. 5 and 8 to 10) is introduced, which completely passes through the outflow pipe 6 in the radial direction. The hollow base 16 is formed in one piece with the outflow pipe 6 and projects through the outflow pipe 6; the interior of the hollow foot 16 is separated from the outlet flow pipe 6 in a flow-tight manner.

The hollow base 16, which forms a latching element designed as a rat recess, has an elongated, approximately oval-shaped cross section and serves to latch the filter insert 4 in the filter housing 2. The hollow base 16 has a circumferential one Wall on which separates the interior of the hollow foot from the interior of the discharge pipe 6 in a flow-tight manner. The interior of the hollow foot 16 serves to receive housing-side fastening elements 17, 18, which form counter-latching elements and are each designed as a latching projection. The hollow base 16 and the fastening elements 17, 18 form a latching device, via which the filter insert 4 is latched in the filter housing.

The fastening elements 17, 18 are integrally formed with the filter housing 2 or the housing cover 12, they extend orthogonally to the longitudinal axis of the discharge pipe 6 and protrude into the interior of the hollow foot 16 a. The fastening elements 17, 18 each form a dome, which, however, has a smaller cross-section than the interior of the hollow foot 16, so that an axial relative displacement of the outflow pipe 6 or filter insert 4 along the longitudinal axis of the outflow pipe is possible. The dome-like fastening elements 17, 18 are firmly connected to one another via a screw 19, which is introduced via the housing cover 12.

For assembly, the filter insert 4 is first inserted into the receiving space 3 of the filter housing 2, wherein the dome-like, designed as a locking projection fastener 17, which is integrally formed with the filter housing 2 and rises from the bottom of the receiving space upwards, into the interior of the hollow base sixteenth protrudes in the outlet pipe 6. Subsequently, the outflow pipe 6 is displaced along its longitudinal axis so that the frontal portion of the outflow pipe 6 with the knurling 15 and the groove portion in the housing stub 7, which is arranged on the filter housing 2, is inserted. Thereafter, the male member 13, 14 are axially inserted through the discharge opening 8 in the outflow pipe 6. Finally, the housing cover 12 is placed and the dome-like, downwardly projecting and designed as a counter locking projection fastener 18 is inserted into the housing cover 12 in the interior of the hollow leg 16 in the outflow pipe 6 until the dome-like fasteners 17, 18 are arranged coaxially to each other and the screw 19 can be firmly connected to each other.

As can be seen from FIGS. 9 and 10 in conjunction with FIGS. 5 to 8, the hollow base 16 has an elongate cross section and comprises an insertion section 26 and a latching section 27 which merge into one another. The insertion section 26 serves formed as a locking projection fastener 17 on the filter housing 2 when inserting the filter element 4 in the filter housing. On the other hand, the latching section 27 serves for latching reception and mounting of the fastening element 17. On the wall of the hollow base 6, a part-circular, convexly inwardly projecting support 28 is formed, which limits the insertion section 26. With the insertion of the fastening element 17 into the hollow base 16, the lateral surface of the fastening element 17 rests against the support 28 (FIG. 9).

To reach the latching position, the fastening element 17 has to be transferred from the position in the insertion section 26 (FIG. 9) into the latching position in the latching section 27 (FIG. 10). The travel from the insertion to the locking portion 26, 27 is bounded by lateral guide webs 29, 30, which are arranged along the longitudinal sides of the hollow leg 16 on the inner wall and are formed integrally with the wall of the hollow foot. The hollow base including the guide webs is preferably made of plastic, the guide webs 29, 30 have an elastic compliance and can dodge radially outward when the fastener 17 between insertion and locking portion 26, 27 is transferred.

The travel between the insertion and latching sections 26, 27 tapers in the direction of the latching section, so that a transfer during assembly from the insertion section 26 in the direction of the latching section 27 with only a small actuating force is possible. The guide webs 29, 30 have on their mutually facing side in each case a latching point 31, 32 on which the fastening element 17 engages latching in the latching position, so that the fastening element 17 is securely held in the latching position. When releasing the locking position, the fastening element 17 must be adjusted again from the latching portion 27 to the insertion section 26, whereby a higher actuating force than in the opposite direction is required.

The fastening element 17 formed on the filter housing 2 as a latching projection consists of a dome-like base 17a and a fastening eye 17b which is mounted on the base on the base side and has a smaller diameter relative to the base 17a. The diameter of the pedestal 17a is sized so that the pedestal 17a does not fit axially between the lateral guide webs 29 and 30; the upper end face of the base 17a, on which the fastening eye 17b has smaller diameter rests on the underside of the guide webs 29, 30, whereas the fastening eye 17b of smaller diameter protrudes between the guide webs 29, 30. The latching position is occupied by the fastening eye 17b, which rests latching in the latching position shown in FIG. 10 at the latching points 31, 32 on the inside of the guide webs 29, 30.

As can be seen in FIG. 7, the fastening eye 17b receives the screw 19 and thereby secures the upper fastening element 18, which is formed integrally with the housing cover 19, on the lower fastening element 17.

Claims

claims

1 . Filter device, in particular gas filter, for example air filter for an internal combustion engine, with a filter insert (4) which can be inserted into a filter housing (2) and which has a filter element (5) and a latching element which is in a latching position with a counter-latching element in the filter housing (2). is to be brought, characterized in that the latching element and the counter-latching element as Rastaus- recess (16) or latching projection (17) are formed, wherein the Rastaus- recess (16) an insertion section (26) for inserting the latching projection (17) and a latching portion (27) for fixing the latching projection (17) and the latching projection (17) transversely to the insertion direction of the insertion section (26) in the latching portion (27) of the latching recess (16) is adjustable.

2. Filter device according to claim 1, characterized in that the latching element (16) is arranged on the filter insert on the clean side of the filter element.

3. Filter device according to claim 1 or 2, characterized in that the latching element of the filter insert (4) is designed as a latching recess (16) and the housing-side counter-latching element as a latching projection (17).

4. Filter device according to claim 2 and 3, characterized in that the latching recess (16) is separated from the clean side of the filter element in a flow-tight manner.

5. Filter device according to claim 4, characterized in that on the clean side of the filter element, an outflow pipe (6) which is part of the filter insert (4), and the latching recess (16) protrudes into the outflow pipe (6), but flow-tight from the outflow pipe (6) is separated.

6. Filter device according to one of claims 1 to 5, characterized in that the latching recess is designed as a hollow foot (16).

7. Filtereinnchtung according to one of claims 1 to 6, characterized in that in the latching recess (16) between the insertion section and the latching portion lateral guide webs (29, 30) are introduced.

8. Filter device according to claim 7, characterized in that the guide webs (29, 30) the transfer path from the insertion section (26) in the direction of the latching portion (27) taper.

9. Filter device according to claim 7 or 8, characterized in that the guide webs in the region of the latching portion (27) engage around the latching projection (17) partially positively.

10. Filter device according to one of claims 1 to 9, characterized in that the housing-side latching projection (17) is assigned a Gegenrastvorsprung (18) on a NEM housing cover (12) and the Gegenrastvorsprung (18) on the housing cover (12) also in the Detent recess (16) protrudes.