DE102013020539A1 - filter element - Google Patents

Abstract

The invention relates to a filter element (10) having a first fluid path (12) on a raw side (60) for filtering a first fluid (64) and a second fluid path (14) with a fluid line (16) on a clean side (62) for guidance a second fluid (66). The filter element (10) is provided at least on one side with a first end plate (20). In this case, the fluid line (16) in the central inner region (36) of the filter element (10) and with the end plate (20) for common removal, in particular filter element fixed, connected. Furthermore, the end disk (20) has a bore (38) in such a way that the fluid line (16) is connected via the bore (38) to an outer region (44) of the filter element (10).
The invention further relates to a filter system (100) with such a filter element (10).

Description

Technical area

The invention relates to a filter element for filtering a fluid and a filter system with a filter element, in particular a fuel filter of a motor vehicle.

State of the art

When operating a liquid filter, for example, as a fuel filter for diesel fuel air bubbles should be avoided, which could be supplied to the internal combustion engine. Namely, at the beginning of the liquid supply into an outer chamber of a filter arrangement, a certain amount of air upstream of the liquid is generally transported into the outer chamber. This amount of air is also pressed by the repressing liquid through the filter cartridge and thus also enters the outlet of the filter assembly. In particular, when used as a fuel filter, this is very disadvantageous because the downstream units, such as an internal combustion engine, can be hindered by air pockets in the fuel supply during operation.

For this reason, a vent should be provided in the liquid filter. Through this venting and in particular through a hole provided therein, which is also referred to as a vent nozzle, however, results in a permanent loss volume flow of fuel, which is fed back directly into the tank, together with the air bubbles. In practice, for example, holes with diameters up to 0.7 mm are common. The reaching through this comparatively large holes loss volume flow should be as low as possible.

The EP 1 356 199 B1 Therefore proposes to connect two vent nozzles in a row, that is, to provide two bores, which are arranged one behind the other in the flow direction of the air bubbles or the fuel leakage current. The venting function is realized via a filter housing fixed tube with a first bore, which serves to receive the filter element, which is closed with a lid with a second bore. As a result, both venting nozzles are connected in series in the venting function. In this way results in an increased resistance to the liquid compared to the use of only one equal vent nozzle. This increased resistance could be achieved using only a vent nozzle through a smaller diameter of the bore, but this can be complex manufacturing technology and also may involve the risk that the very small hole quickly clogged, so that the venting function is no longer given.

Disclosure of the invention

An object of the invention is therefore to design a filter element so that a vent of a tank system can be displayed in a simple and reliable manner.

A further object of the invention is to provide a filter system for receiving such a replaceable filter element, which can represent a venting of a tank system in a simple and reliable manner. The above objects are achieved according to an aspect of the invention in a filter element having a first fluid path on a raw side for filtering a first fluid and a second fluid path with a fluid line on a clean side for guiding a second fluid in that the fluid conduit centrally in the interior of the filter element arranged and with the end plate for common removal, in particular filter element fixed, is connected, wherein the end plate has a bore in such a way that the fluid line is connected via the bore with an outer region of the filter element. According to another aspect of the invention, the object is achieved by a filter system with a filter element, wherein the filter element is arranged interchangeable in a filter housing of the filter system and provides a receptacle for a fluid line and / or a receptacle for a check valve.

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

It is proposed a filter element having a first fluid path on a raw side for filtering a first fluid and a second fluid path with a fluid line on a clean side for guiding a second fluid, which filter element is provided at least on one side with a first end plate, the fluid line centric in the interior arranged the filter element and with the end plate for common removal, in particular filter element fixed, is connected, wherein the end plate has a bore in such a way that the fluid line is connected via the bore with an outer region of the filter element.

According to the invention, a venting of a filter system takes place via the filter element itself. In the inner region of the filter element there is a fluid line as a venting channel, which is preferably tubular. The fluid line is connected to the first end plate, in which a small bore is integrated. Through this hole, the air in the filter system, for example during the Commissioning be removed through the filter element. The vent is so completely separated from the clean side. When commissioning a filter system is only the second fluid, so usually air, in the fluid line, while in operation, the fluid line with the first fluid, so for example fuel, the raw side is filled.

By venting in or through the filter element significantly simpler solutions of a filter housing can be displayed. As a result, elaborate processing of the filter housing can be omitted and the function of a filter system can be ensured with fewer parts, compared to solutions in which the venting takes place via a venting channel arranged in the filter housing. In this case, the fluid line is arranged so that it can be expanded together with the filter element, since it is in particular firmly connected thereto.

Conveniently, the fluid conduit of the second fluid may be arranged in a support tube connected to the end disk and projecting beyond at least one of a first end disk and / or a second end disk. This makes it possible to avoid an additional venting channel and the support tube, which is firmly connected to the first end plate and may alternatively have further fastening elements to the filter body, can serve as an additional stiffening of the filter element. The fact that the fluid line protrudes beyond the end plates, the installation of the filter element in the filter housing, or the lid with an existing check valve, which can be plugged onto the fluid line simplify.

Advantageously, a check valve may be arranged in the second fluid path, which check valve blocks when a flow of the first fluid is interrupted by the filter element or is. Thus, the usually desired continuous ventilation of a filter element of an internal combustion engine can be equipped with a check valve. In this way, with the internal combustion engine switched off, for example during start / stop operation, the fuel can be kept in the filter system and it can be prevented that any air present in a tank return passes through the filter system into the fuel guide system of the internal combustion engine. If the internal combustion engine is not running, so the vent of the filter element can remain closed. If the internal combustion engine is started, and during start / stop operation usually a very short engine starting time is desirable, the necessary system pressure in the fuel guide system for an ignition release can be established immediately in the filter system. The system pressure, which builds up in an outer area of the filter element, allows opening of the check valve and the filter element can be vented again permanently. The big advantage is that short engine start times are made possible by the fuel remaining in the filter system.

Another advantageous design possibility is to design the filter element such that a check valve is alternatively or additionally sealed within the fluid line and with a concentric seal to the fluid line, the seal being arranged in particular for common removal with the filter element. Preferably, a molded seal firmly connected to the fluid line can be used for this seal. The fluid line, which can be realized in particular in a central support tube of the filter element, can be completed directly with the check valve, which can reduce the number of components and further simplify assembly. If the seal is removed together with the filter element, this ensures that it is also changed when changing the filter element and so not a used and possibly no longer secure seal after changing the filter element is used.

An advantageous embodiment of the filter element further provides that the check valve with a snap connection can be fastened, in particular fluid-tight fastened. A seal in the fluid line can be realized for example with an O-ring seal. The check valve, which may conveniently be arranged in this embodiment in a valve carrier, can be easily used during assembly. The end plate of the filter element can hold the check valve firmly via the snap connection. Alternatively, the check valve can be held by the snap connection via a housing cover of the filter system. In addition, the check valve can be easily replaced by such, sealed via an O-ring seal arrangement in case of failure of the check valve.

Conveniently, the check valve may be mounted in a housing upper part of a filter housing, wherein the fluid line may be accessible through the end plate and the check valve may be arranged above or in the end plate. In this way, a simple installation and also possible interchangeability of the check valve in case of failure is given.

Conveniently, the filter element can be designed as a hollow cylinder and the first fluid path can pass radially through a filter body of the hollow cylindrical filter element. Advantageously, the first fluid path can lead radially from an outer region into an inner region into the filter element. This arrangement allows an inflow, for example, of fuel from the outside over the circumference of the filter element by the example star-folded filter medium of the filter body. The fuel can then flow through the filter element to the inside and be discharged via the inner region of the filter element in the fuel supply of an internal combustion engine.

Advantageously, the filter element can be provided on a side opposite the first end disk side with a second end plate, wherein the fluid line can be connected to the second end plate. In this way, an effective constructive stiffening of the filter element itself and the fluid line can be represented with little effort.

In a favorable embodiment, the fluid line can be sealable with a seal, for example an O-ring seal or another form seal, when installed in a filter housing. This ensures that the vent line is completely separated from the clean side of the filter system. Further, this is a quick and easy change of the filter element in case of maintenance given by the fluid line is simply pulled out of its receptacle in the filter housing.

Advantageously, the fluid line may be provided with a drain device for separating first and second fluid during removal of the filter element from a filter housing. In this way, when the filter element is replaced in the event of maintenance, a passage of the first fluid into the receptacle of the fluid line in the filter housing and thereby into the second fluid path is effectively prevented.

In an advantageous embodiment, the filter element with at least two seals, such as O-ring seals or other form seals, for separation of dirty side and clean side of the first fluid path during removal of the filter element from a filter housing be sealed, wherein the filter element in the intended installation in a Filter system is connected via a arranged at the first end plate quick coupling with a filter housing to be coupled. The fact that an O-ring seal maintains its sealing function until the first fluid has run off on the dirty side, for example via a drainage channel, prevents a portion of the first fluid from the dirty side to the clean side of the filter system and thus the Fuel system of an internal combustion engine can pollute. An upper housing part can be connected to the quick-coupling, such as a bayonet connection, reliably and quickly with the filter element, thus sealing the filter system tight. Also, a safe disassembly of the filter element is given in this way, since in this way the filter element can be removed with the upper housing part of the filter housing.

Conveniently, the filter element may be provided with a Wasserabscheidevorrichtung comprising a so-called coalescer, which is arranged concentrically around the fluid line on a clean side of the filter element, and an Endabscheider, which is arranged concentrically around the fluid line between coalescer and fluid line. For example, fuel as the first fluid may contain a certain amount of water, which may cause damage to the injection system of an internal combustion engine. In order to prevent this, the water contained on the clean side of the filter system, for example via a twisting device, wherein the first fluid is thereby rotated, and thus separated by the different specific gravity of the water from the fuel and drain separately. Alternatively, the coalescer serves to agglomerate small droplets of water into larger drops of water that can then collect and drain on an end separator due to gravity. In the water separation, the coalescer, the geometry of the sedimentation space of the water droplets and the final separators act together to form the water separation device.

Conveniently, the first fluid path may be for filtering fuel. Alternatively, the use of such a configuration for other liquid fluids that need to be filtered is conceivable. Of course, such filter systems are usually provided for other liquid fluids venting systems, so that the use of the proposed venting function is also conceivable when filtering other fluids.

According to a further aspect, the invention relates to a filter system with a filter element, wherein the filter element can be interchangeable arranged in a filter housing of the filter system and which filter system can provide a receptacle for a fluid line and / or a receptacle for a check valve. Since filter elements of a filter system in the raw fluid area, i. H. in the range of an unfiltered fluid, usually have to be replaced at regular maintenance intervals, it is expedient if the filter element is provided replaceable.

Advantageously, in such a filter system, the usually desired continuous ventilation of the filter system of an internal combustion engine can be equipped with a check valve. In this way, when the internal combustion engine is switched off, for example during start / stop operation, the fuel is held in the filter system be and prevents that possibly existing in a tank return air passes through the filter system in the fuel supply system of the internal combustion engine. If the internal combustion engine is not running, so the vent of the filter system can remain closed. If the internal combustion engine is started, and during start / stop operation usually a very short engine starting time is desirable, the necessary system pressure in the fuel guide system for an ignition release can be established immediately in the filter system. The system pressure allows opening of the check valve and the filter system can be vented again permanently. The big advantage is that short engine start times are made possible by the fuel remaining in the filter system.

In an advantageous embodiment, the filter system may be such that the second fluid path of the filter element is provided for venting a fuel guide system of an internal combustion engine. Especially in internal combustion engines, in which the startup should take place in a relatively short time, such as the start / stop operation of today's internal combustion engines, such a ventilation system is of great advantage, since it keeps the fuel with the internal combustion engine in the filter system and thus allows short start times.

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 longitudinal section through a filter system according to an embodiment of the invention for the fuel filter in a motor vehicle;

2 an enlarged view of the upper part of the longitudinal section of 1 with details of the arrangement of a fluid line and a check valve of the filter system;

3 a longitudinal section through a filter system according to another embodiment for the fuel filter in a motor vehicle with a direct arrangement of a check valve in a fluid line;

4 an enlarged view of the upper part of the longitudinal section of 3 with details of the arrangement of a check valve for the vent in a fluid line;

5 a longitudinal section through a filter system according to another embodiment for the fuel filter in a motor vehicle with two O-rings for sealing a filter element against a filter housing;

6 a longitudinal section through a filter element with Wasserabscheidefunktion, as shown in the in 5 illustrated filter system is used ;.

7 a longitudinal section through a filter element without Wasserabscheidefunktion, as shown in the in 5 shown filter system is used;

8th an isometric view of a filter element with a quick coupling according to another embodiment of the invention;

9 a section through a filter element after 8th ;

10 a longitudinal section through a filter element with Wasserabscheidefunktion according to another embodiment of the invention; and

11 a longitudinal section through a filter system with Wasserabscheidefunktion according to another 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.

The invention is illustrated by means of a fuel filter, but may also be provided for other filter systems with appropriate adaptation of the construction.

1 shows a longitudinal section through a filter system 100 according to an embodiment of the invention for fuel filtration in a motor vehicle. The filter system 100 has a filter element 10 on with a first fluid path 12 for filtering a first fluid 64 from a raw side 60 to a clean side 62 and a second fluid path 14 with a fluid line 16 through a clean side 62 to guide a second, with the raw side 60 related fluids 66 , which filter element 10 with a first end disc 20 is provided, wherein the fluid line 16 centric indoors 36 of the filter element 10 arranged and with the end disk 20 for common removal, in particular filter element fixed, is connected, and the end plate 20 a hole 38 such that the fluid line 16 over the hole 38 with an outdoor area 44 on the raw side 60 of the filter element 10 connected is.

When commissioning the filter system 100 first is the second fluid 66 , usually air, in the fluid line 16 while in operation, the fluid line 16 with the first fluid 64 , so for example fuel, the raw side 60 is filled.

The filter system 100 consists of a central filter housing 101 from two parts, an upper housing part 102 and a housing lower part 104 , The upper housing part 102 can do this via a screw connection 56 with the housing lower part 104 be connected and via an internal O-ring seal 58 be fixed. In the filter housing 101 sits centrally arranged a hollow cylindrical filter element 10 corresponding to the first fluid path indicated by an arrow 12 radially from an outdoor area 44 in an interior area 36 from the first fluid 64 , in particular fuel, is flowed through, which is thereby filtered. The filtering takes place in the filter body 11 the hollow cylindrical filter element 10 instead of.

In an embodiment, not shown, a reverse flow direction from the inside to the outside with appropriate adaptation of the positions of the corresponding components is conceivable.

The filter element 10 is with a quick release 70 in the form of a snap connection with the upper housing part 102 connected and so for example when changing the filter element 10 for maintenance with the unscrewed upper housing part 102 from the lower housing part 104 be pulled out.

The filter body 11 itself preferably consists of folded filter paper and can be made changeable. The filter body 11 is on its inside through a center tube 25 stiffened, creating a collapse pressure resistance of the filter body 11 is realized. The filter system 100 For example, via the two-part filter housing 101 to be opened for changing. The filter element 10 is with two O-ring seals 46 against the lower housing part 104 sealed and separated in this way the outdoor area 44 from the interior 36 the first fluid path, so the crude side 60 from the clean side 62 of the filter system 100 , About the interior 36 of the filter element 10 the filtered fluid flows 64 down from and is further promoted for example to the injection system of an internal combustion engine. After removing the housing top 102 can the filter element 10 be pulled upwards, with the arrangement of the two O-ring seals 46 on the raw side 60 still remaining first fluid 64 outside 44 of the filter system 100 via an idling trough 54 can run off and not on the clean side 62 So the interior 36 of the filter element 10 and thus can get into the engine. At the upper end of the filter element 10 is a first end plate 20 attached, the area on the filter element 10 lies tight and to the inside 36 the filter element, a fluid line 16 followed. The fluid line 16 is at the bottom with an O-ring seal 48 in a recording 106 of the housing base 104 introduced. Also at the lower end of the fluid line 16 is a drain device 50 attached, which when changing the filter element 10 by separation of the first 64 and second fluid 66 the clean side 62 protects the tank system from contamination. In the upper end disc 20 is centrally a check valve 18 at the upper end disc 20 and / or on the upper housing part 102 via a snap connection 22 can be fixed, arranged and via an O-ring seal 34 against the upper end disc 20 sealed. The check valve 18 is expediently designed as a minimum pressure valve with check function and an opening pressure of the order of 0.4 bar and is usually always open during operation of an internal combustion engine. A second fluid path 14 which vent the filter system 100 can serve, thus leads to the outside area 44 of the filter element 10 in the check valve 18 and through a hole 38 in the upper end disc 20 , which serves as a throttle bore for setting a defined flow resistance and is preferably designed in the order of 0.5 mm, in the fluid line 16 , From a tank system with the fuel mitgeförderte air can thus via the check valve 18 and the fluid line 16 via an outlet 40 again from the filter system 100 be led out. Will one to the filter system 100 connected internal combustion engine off, for example, in a start / stop operation, and consequently no fuel from the corresponding tank system re-supplied, so the check valve 18 shut down. This leaves the pressure in the filter element 10 received, and the fuel remains in the filter system 100 , As a result, the conditions for a quick start of the engine are given. After reopening the check valve 18 can the venting of the filter system 100 back into function.

At the first end disk 20 opposite side is the filter element 10 with a second end plate 21 provided, wherein the fluid line 16 with the second end disc 21 connected is.

2 FIG. 4 is an enlarged view of the upper part of the longitudinal section of FIG 1 with details on the arrangement of a fluid line 16 as well as one check valve 18 in the first end disk 20 of the filter element 10 dar. The check valve 18 itself is with its valve body 30 in a valve carrier 32 embedded, for example, pressed. The valve carrier 32 in turn is via an O-ring seal 34 in a corresponding recording 42 the end plate 20 used and thus provides a tight connection to the end plate 20 ago. The valve carrier 32 can via a locking connection 60 on the upper housing part 102 be fixed so that the check valve 18 when removing the upper housing part 102 from the recording 42 the upper end disc 20 is pulled out and in the upper housing part 102 remains. The valve body 30 shows in section the usual design of a check valve with a ball 26 that have a spring 28 is pressed into a valve seat. The end disc 20 in turn, sits tightly on the filter element 10 and has over the hole 38 Connection to the fluid line 16 executed support tube 24 , The second fluid path 14 for venting the filter system 100 leads over the outdoor area 44 of the filter element 10 through the check valve 18 over the hole 38 in that as a fluid line 16 executed support tube 24 of the filter element 10 ,

In 2 is also the quick coupling 70 in the form of a snap connection, with the filter element 10 with the upper housing part 102 is connected and with this from the lower housing part 104 can be pulled out to recognize.

In 3 is a longitudinal section through a filter system 100 according to another embodiment of the invention for fuel filtration in a motor vehicle with a direct arrangement of a check valve 18 in a fluid line 16 shown. The structure of the filter system 100 is similar to the one in 1 shown filter system with a flow direction from outside to inside, by radial arrows from an outdoor area 44 in an interior area 36 through the filter element 10 that is, from a raw page 60 in a clean side 62 of the filter system 100 , is indicated.

A hollow cylindrical filter element 10 is in a two-part filter housing 101 arranged, wherein the filter element 10 can be made changeable. The filter system 100 For example, via the two-part filter housing 101 to be opened for changing. The upper housing part 102 can do this via a screw connection 56 with the housing lower part 104 be connected and via an internal O-ring seal 58 be fixed.

The filter element 10 is with a quick release 70 in the form of a bayonet connection with the upper housing part 102 connected and so for example when changing the filter element 10 for maintenance with the unscrewed upper housing part 102 from the lower housing part 104 be pulled out.

A first fluid path 12 shows the path of the first fluid to be filtered, for example fuel, from an outside area 44 of the filter element 10 radially through the circumference into an interior area 36 that is, from a raw page 60 to a clean side 62 of the filter system 100 , Unlike the in 1 However, the filter system shown here is the check valve 18 directly in the fluid line 16 , in turn, in the support tube 24 is formed, arranged and closes with the support tube 24 via an O-ring seal 34 radially tight. The check valve 18 can via its valve carrier 32 with a snap connection 22 on the upper housing part 102 be fixed. The support tube 24 is an integral part of the filter element 10 and with the first end disc 20 connected. The second fluid path 14 for venting the filter system 100 leads in an analogous way to 1 from the outside area 44 of the filter element 10 through the check valve 18 in the fluid line 16 which also in an outlet 40 empties. The fluid line 16 is at the bottom with an O-ring seal 48 in a recording 106 of the housing base 104 introduced. Also at the lower end of the fluid line 16 is a drain device 50 attached, which when changing the filter element 10 by separation of the first 64 and second fluid 66 protects the clean side of the tank system from contamination. When changing the filter element 10 from the lower housing part 104 can as in the embodiment in 1 by the arrangement of the two O-ring seals 46 the first fluid still in the raw area 64 on the raw side 60 of the filter system 100 via an idling trough 54 can run off and not on the clean side 62 So the interior 36 of the filter element 10 and thus get into the internal combustion engine.

4 shows an enlarged view of the upper part of the longitudinal section of 3 with details of the arrangement of the check valve 18 for venting in the fluid line 16 , The check valve 18 is with its valve carrier 32 in which the valve body 30 is arranged directly into the fluid line 16 in the support tube 24 formed and opposite the filter element 10 with an O-ring seal 34 radially sealed, used, for example, pressed. Alternatively, the check valve 18 also in the upper housing part 102 be arranged and there for example via a snap connection 22 be attached. Will the upper housing part 102 then on the in the lower housing part 104 used filter element 10 put on, so the check valve 18 in the support tube 24 executed fluid line 16 pushed and over the O-ring seal 34 be sealed. The second fluid path 14 for venting the filter system 100 thus leads in an analogous way to the in 1 illustrated filter system from outdoors 44 of the filter element 10 over the check valve 18 whose function is through a spring 28 ball pressed into a valve seat 26 is shown in the as a fluid line 16 trained support tube 24 from where the air can be returned to the tank system again. The operation of the check valve 18 takes place analogously to the in 1 illustrated filter system. Will one to the filter system 100 connected internal combustion engine, for example, in a start / stop operation, turned off and consequently no fuel from a tank system nachgeliefert, so the check valve 18 shut down. This leaves the pressure in the filter element 10 The fuel stays in the filter system 100 , As a result, the conditions for a short-term start of the internal combustion engine are given. After reopening the check valve 18 can the venting of the filter system 100 back into function.

In 5 is a longitudinal section through a filter system 100 according to a further embodiment of the invention for fuel filtration in a motor vehicle with two O-rings 46 for sealing a filter element 10 against a filter housing 101 shown. The structure of the filter system 100 is similar to the one in 3 illustrated filter system with a flow direction from outside to inside, which by arrows from an outdoor area 44 in an interior area 36 in the filter element 10 that is, from a raw page 60 to a clean side 62 of the filter system 100 , is indicated and differs from that in 3 illustrated embodiment in that the recording of the filter element 10 in the housing lower part 104 designed differently. The filter element 10 has two O-ring seals 46 on, lying on the same diameter and an idle trough 54 close tightly. When changing the filter element 10 and thus when pulling out the filter element 10 from the lower housing part 104 Can it still be outdoors 44 located first fluid 64 over this idle trough 54 drain, so it's not on the clean side 62 So the interior 36 of the filter element 10 and thus can get into the engine.

The filter element 10 is with a quick release 70 in the form of a snap connection as in the 1 illustrated embodiment with the upper housing part 102 connected and so for example when changing the filter element 10 for maintenance with the unscrewed upper housing part 102 from the lower housing part 104 be pulled out.

The other functional behavior of the filter system 100 after the in 5 illustrated embodiment corresponds to in 3 illustrated embodiment. Again, the fluid line 16 at the bottom with an O-ring seal 48 in a recording 106 of the housing base 104 introduced. Also at the lower end of the fluid line 16 is a drain device 50 attached, which when changing the filter element 10 By separating the first and second fluid protects the clean side of the tank system from contamination.

Coaxial with the support tube 24 is a water separation device 69 to recognize who a coalescer 74 , which concentrically around the fluid line 16 on a clean side 62 of the filter element 10 is arranged, and an end separator 68 , which concentrically around the fluid line 16 between coalescers 74 and fluid line 16 is arranged comprises. The final separator 68 has a sealing lip at the bottom 52 for connection to an outlet, via which separated water can be led into a water collecting space. The final separator 68 supports itself by applying to the support tube 24 for venting the filter element 10 serves, off.

6 shows a longitudinal section through a filter element 10 with water separation function as it is in the 5 illustrated filter system 100 is usable. The filter element 10 , which as upper conclusion a first Endscheibe 20 has, is via a central support tube 24 acting as a fluid line 16 acts, stiffens. The support tube 24 has an O-ring seal at the bottom 48 for sealing when inserting into a filter housing 101 , as well as a drainage device 50 to separate the former 64 and second fluid 66 when changing the filter element 10 and thus removing it from the filter housing 101 , The sealing of the filter element 10 even to the filter housing 101 This happens via the two O-ring seals with the same diameter 46 that separate from raw side 60 and clean side 62 of the filter element 10 when changing by draining the on the raw side 60 still remaining first fluid 64 via an idling trough 54 serve. Coaxial with the support tube 24 is a water separation device 69 to recognize who a coalescer 74 as well as an end separator 68 comprises, at the lower end a sealing lip 52 for connection to an outlet over which separated water can be separately led into a collecting space. The final separator 68 supports itself by applying to the support tube 24 from. The end disc 20 carries bayonet elements of a quick coupling 70 for connecting the filter element 10 with the upper housing part 102 ,

7 shows a longitudinal section through a filter element 10 without water separation function, as it is in the 5 illustrated filter system 100 is usable. The filter element 10 has the same characteristics as the one in 6 illustrated filter element 10 up, except for the missing water separation 69 for water separation, so that reference is made to avoid unnecessary repetition of the figures in question.

In 8th is an isometric view of a filter element 10 with a quick coupling 70 shown according to another embodiment of the invention. The filter element 10 points to the upper end disc 20 Connecting elements of a quick coupling 70 on, which are designed in the form of bayonet hooks. With these bayonet hooks can be a fast and secure connection to an upper housing part 102 be prepared, on which the filter element 10 when changing the filter element 10 For example, for maintenance purposes, also from a lower housing part 104 can be removed. Centric protrudes over the upper end disc 20 of the filter element 10 a support tube 24 as a fluid line 16 out, a seal at the top 34 in the form of a molded seal 72 , which close to the support tube 34 is arranged, carries. The lower end disc 21 which the filter body 11 closes down, has at its outer periphery a seal 46 for separation of clean side 62 and raw side 60 of the filter element 10 when installed in a filter housing 101 on.

9 shows a section through the filter element 10 as it is in 8th is shown. In the sectional view it can be seen that the seal 46 at the lower end disc 21 from two separate seals 46 in the form of O-rings, which is the filter body 11 on its outside and inside seal off and so the raw side 60 against the clean side 62 of the filter element 10 separate. The inside of the filter body 11 is through a center tube 25 supported, which in turn on its inside a coalescer 74 a Wasserabscheidevorrichtung 69 wearing. The deposition of the coagulated water drops then happens at the Endabscheider 68 the Wasserabscheidevorrichtung 69 (please refer 11 ) concentric around the support tube 16 is arranged and with a stiffening rib 78 connected to this. On average, there is also the molded gasket 72 at the upper end of the support tube 16 clearly recognizable, which when changing the filter element 10 remains on this and so with the filter element 10 also exchanged.

10 represents a longitudinal section through a filter element 10 with Wasserabscheidefunktion according to another embodiment of the invention and corresponds to the isometric view of 9 ,

11 shows a longitudinal section through a filter system 100 with Wasserabscheidefunktion according to another embodiment of the invention. The structure of the filter system 100 is similar to the one in 5 illustrated filter system with a flow direction from outside to inside, which by arrows from an outdoor area 44 in an interior area 36 in the filter element 10 that is, from a raw page 60 to a clean side 62 of the filter system 100 , is indicated and differs from that in 5 illustrated embodiment in that the recording of the filter element 10 in the housing lower part 104 designed differently.

The filter element 10 points to its lower end disc 21 two O-ring seals 46 on that the filter body 11 each seal on its outside and inside, and thus the raw side 60 from the clean side 62 separate. When changing the filter element 10 and thus when pulling out the filter element 10 from the lower housing part 104 Can it still be outdoors 44 located first fluid 64 via an idling trough 54 drain, so it's not on the clean side 62 So the interior 36 of the filter element 10 and thus can get into the engine. The filter element 10 is via a quick release 70 in the form of a bayonet connection with the upper housing part 102 connected and so can with the upper housing part 102 when changing the filter element 10 for maintenance purposes from the lower housing part 104 be removed. The check valve 18 the second fluid path 14 sits in the valve carrier 32 , in turn, with a snap connection 22 with the upper housing part 102 connected is. In contrast to the other illustrated embodiments in the 1 . 3 . 5 is the valve carrier 32 designed bell-shaped and can so on the molded seal 72 slide, so the second fluid path 14 the fluid line 16 which are in the support tube 24 is designed to seal. When changing the filter element 10 This can be so with the upper housing part 102 be pulled out. The valve carrier remains 32 with the check valve 18 on the mold seal 72 , When the filter element 10 completely out of the housing base 104 removed, the upper housing part 102 over the quick coupling 70 be removed with the valve carrier 32 and the check valve disposed therein 18 from the filter element 10 subtracted from. At the same time, the valve carrier will become 32 from the mold seal 72 subtracted, which thereby on the support tube 24 remains. When inserting a new filter element 10 So also comes a new form seal 72 for use.

The other functional behavior of the filter system 100 after the in 5 illustrated embodiment corresponds to in 5 illustrated embodiment. Again, the fluid line 16 at the bottom with an O-ring seal 48 in a recording 106 of the housing base 104 introduced. Also at the lower end of the fluid line 16 is a drain device 50 attached, which in a change of filter Elements 10 By separating the first and second fluid protects the clean side of the tank system from contamination.

Coaxial with the support tube 24 is a water separation device 69 to recognize who a coalescer 74 , which concentrically around the fluid line 16 on a clean side 62 of the filter element 10 is arranged, and an end separator 68 , which concentrically around the fluid line 16 between coalescers 74 and fluid line 16 is arranged comprises. The final separator 68 supports itself by applying over the stiffening element 78 on the support tube 24 , which for venting the filter element 10 serves, off. The separated water passes through a water drain 114 in a water collection room 112 from which it has an outlet 116 can be drained.

The clean side 62 of the filter element 10 flows into an outlet 108 from which the filtered fluid 64 can be passed in an internal combustion engine. The fluid line 16 flows into an outlet 110 which can be led back into a tank room.

QUOTES INCLUDE IN THE DESCRIPTION

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Cited patent literature

• EP 1356199 B1 [0004]

Claims (15)

Filter element ( 10 ) with a first fluid path ( 12 ) on a raw page ( 60 ) for filtering a first fluid ( 64 ) and a second fluid path ( 14 ) with a fluid line ( 16 ) on a clean side ( 62 ) for guiding a second fluid ( 66 ), which filter element ( 10 ) at least on one side with a first end plate ( 20 ), the fluid line ( 16 ) centric indoors ( 36 ) of the filter element ( 10 ) and with the end plate ( 20 ) for common removal, in particular filter element fixed, is connected, wherein the end plate ( 20 ) a hole ( 38 ) such that the fluid line ( 16 ) over the hole ( 38 ) with an outdoor area ( 44 ) of the filter element ( 10 ) connected is. Filter element according to claim 1, wherein the fluid line ( 16 ) of the second fluid ( 66 ) in one with the end plate ( 20 ) and via at least one of a first end plate ( 20 ) and / or a second end plate ( 21 ) projecting support tube ( 24 ) is arranged. Filter element according to claim 1 or 2, wherein in the second fluid path ( 14 ) a check valve ( 18 ), which check valve ( 18 ) locks when a flow of the first fluid ( 64 ) through the filter element ( 10 ) is interrupted or is. Filter element according to one of the preceding claims, wherein a check valve ( 18 ) within the fluid line ( 16 ) and with a concentric seal ( 34 ) to the fluid line ( 16 ) is arranged, wherein the seal ( 34 ) is arranged in particular for joint removal with the filter element. Filter element according to one of the preceding claims, wherein the check valve ( 18 ) with a snap connection ( 22 ) is fastened, in particular fluid-tight fastened. Filter element according to one of the preceding claims, wherein the check valve ( 18 ) in an upper housing part ( 102 ) of a filter housing ( 101 ) is attachable. Filter element according to one of the preceding claims, wherein the filter element ( 10 ) is designed as a hollow cylinder and the first fluid path ( 12 ) radially through a filter body ( 11 ) of the hollow cylindrical filter element ( 10 ), in particular from an outdoor area ( 44 ) into an interior area ( 36 ) of the filter element ( 10 ) leads. Filter element according to one of the preceding claims, which on one of the first end plate ( 20 ) opposite side with a second end plate ( 21 ), the fluid line ( 16 ) with the second end plate ( 21 ) connected is. Filter element according to one of the preceding claims, wherein the fluid line ( 16 ) with a seal ( 48 ) when installed in a filter housing ( 101 ) is sealable. Filter element according to one of the preceding claims, wherein the fluid line ( 16 ) with a drain device ( 50 ) for the separation of the first ( 64 ) and second fluid ( 66 ) when removing the filter element from a filter housing ( 101 ) is provided. Filter element according to one of the preceding claims, wherein the filter element with at least two seals ( 46 ) for separation of raw side ( 60 ) and clean side ( 62 ) of the first fluid path ( 12 ) when removing the filter element from a filter housing ( 101 ) is sealable, wherein the filter element in the intended installation in a filter system ( 100 ) via a at the first end plate ( 20 ) arranged quick coupling ( 70 ) with a filter housing to be coupled ( 101 ) connected is. Filter element according to one of the preceding claims, wherein the filter element with a Wasserabscheidevorrichtung ( 69 ), comprising a coalescer ( 74 ), which concentrically around the fluid line ( 16 ) on a clean side ( 62 ) of the filter element ( 10 ), and an end separator ( 68 ), which concentrically around the fluid line ( 16 ) between coalescers ( 74 ) and fluid line ( 16 ) is arranged. Filter element according to one of the preceding claims, wherein the first fluid path ( 12 ) is used to filter fuel. Filter system ( 100 ) with a filter element ( 10 ) according to one of the preceding claims, wherein the filter element ( 10 ) changeable in a filter housing ( 101 ) of the filter system ( 100 ) and which filter system ( 100 ) a recording ( 106 ) for a fluid line ( 16 ) and / or a recording ( 42 ) for a check valve ( 18 ). Filter system according to claim 14, wherein the second fluid path ( 14 ) of the filter element ( 10 ) is provided for venting a fuel supply system of an internal combustion engine.

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