DE102010038338A1 - Filter installation for filtering petrol in internal combustion engine of e.g. passenger vehicle, has filter case whose interior region comprises sealing element by which nozzles are sealed together with respect to filter element - Google Patents

Abstract

The installation (10) has a filter element (28) housed in a filter case (12) and provided with two nozzles (20, 22). An interior region of the filter case is equipped with a sealing element (24) i.e. sealing felt, by which the nozzles are sealed together with respect to the filter element. The sealing element is in the form of a plate with through-holes (60, 58) for the respective nozzles. The sealing element is pushed from the interior of the filter case using the filter element against the filter case.

Description

State of the art

The invention relates to a filter device, in particular for fuel or urea, with a filter element which is arranged in a filter housing, are connected to the at least one first and a second connecting piece.

Filtering devices of fuel supply systems of modern motor vehicles, such as passenger cars or trucks, in particular has the function to clean the guided through the filter fuel from dirt particles. In order to realize these functions, it is known to arrange a filter element in particular in the form of a filter cartridge in a filter housing. The filter housing is usually designed with a filter housing cup, which is fluid-tightly sealed with a filter housing cover.

The filter housing cover has a plurality of connections or connecting pieces for supplying and discharging a fuel to be filtered. Through these connections, the fuel is passed through the filter element in such a way that the dirt particles entrained in the fuel and entrained water are retained and separated.

So that the fuel is passed through the filter element inside the filter housing and this does not flow around only laterally, a seal must be made between the terminals and at least the filter element.

Disclosure of the invention

According to the invention, a filter device, in particular for fuel, is provided with a filter element which is arranged in a filter housing to which at least one first and one second connecting piece are connected and in which a sealing element is provided in the interior of the filter housing with which the first connecting piece and the second connecting piece are sealed together at least to the filter element.

With the sealing element according to the invention, it is possible to realize within the filter housing with only one component several sealing functions. The sealing element seals around both the first and the second. Connection piece around such a way that the fluid to be filtered is forcibly passed through the filter element and can not flow around it. The filter element is sealed around a connection piece around to the filter housing.

Furthermore, the sealing element according to the invention forms the basis for the fact that at least one further component or another body can be arranged in the interior of the filter housing, through which the fluid to be filtered is likewise to be conducted and which also has to go around a connecting piece to the filter housing is sealed.

In an advantageous embodiment of the filter device according to the invention, the sealing element is designed from a sealing felt.

The sealing felt is inexpensive to manufacture and assemble and in particular has a good compression behavior in order to produce a seal by pressing against the filter housing and on the filter element and / or on the body.

According to a further advantageous development of the filter device according to the invention, the sealing element is disc-shaped, each with a through opening for the first connecting piece and for the second connecting piece designed.

The sealing element designed in this way surrounds two connecting pieces and provides a surface around both connecting pieces around which the filter element and / or the body can be applied and sealed. For this purpose, the cartridge-shaped filter element in particular has a central neck-shaped connecting piece and / or the body is provided with at least one annular connecting surface for coupling to the sealing element. In the center of this annular connection surface then the associated connection piece is arranged, which protrudes through the filter housing, so that the body can be attached to it.

According to a further advantageous development of the filter device according to the invention, at least one passage opening of the sealing element is designed on its circumference with at least one notch.

Particularly preferably, a plurality of notches or depressions are distributed on the circumference of the passage opening. In this way, the circumference is particularly wavy. With the notches, the insertion of the connecting piece when mounting the sealing element is facilitated by the body is better to couple with the through hole. At the same time, a sufficiently large area for sealing is provided around the connecting piece by the sealing element.

In a further advantageous embodiment of the filter device according to the invention, the sealing element is urged with the filter element from the inside against the filter housing.

In this development, the filter element generates a pressing force on the sealing element with which, on the one hand, the filter element is sealed off from the sealing element and, on the other hand, the sealing element is sealed off from the filter housing.

According to a likewise advantageous development of the filter device according to the invention, the sealing element is urged with the filter element from the inside against a filter housing cover.

Particularly preferably, this urging of the sealing element takes place from the inside against the filter housing on the filter housing cover. Namely, it is then possible to generate the pressing force when placing the filter housing cover on the remaining filter housing during the cover assembly.

In a further advantageous embodiment of the filter device according to the invention, as already mentioned above, apart from the filter element, a further body is arranged in the filter housing, and one of the connecting pieces is sealed to the body with the sealing element.

With the body can be combined in a cost-effective manner a variety of functions. In particular, two connection can be connected to the body clip, both of which serve as a supply of fuels. The body with its connected connecting pieces can then be used as a mixing chamber for merging and mixing of the supplied through the connecting pieces of fuel flows. Furthermore, a valve for selectively admixing one of the fuel streams is also preferably formed on it. The valve is advantageously formed with a valve body and this adjusting return element. The return element is preferably arranged in the interior of the body, where it is surrounded by the mixed streams. Due to the material which can be used for it and due to possible wall thicknesses, the body can have a higher stability than the rather thin surfaces of the filter housing itself.

According to a further advantageous embodiment of the filter device according to the invention, the body is urged by the filter element against the sealing element.

The body can be easily mounted in this way on the inside of the filter housing and there provides in particular the seal and a connection option for at least one connection piece.

In a likewise advantageous development of the filter device according to the invention, the body is L-shaped.

The thus designed in L-shape with two legs body allows that at the free ends of the legs in each case a connection piece is coupled. The connecting pieces are thereby far apart for attaching terminals and further it is possible to provide in the center of the L-shape a third terminal, which is guided past the body. The connecting pieces are held and fixed particularly advantageous to the body. The L-shaped body thus makes it possible to couple a plurality of connecting pieces (in particular two) to it, to seal it and also to attach it in a stationary manner. The body can advantageously take over functions that previously had to be provided by the filter housing. A corresponding adjustment of the filter housing can therefore be omitted. In addition, as mentioned, advantageously at the apex region of the L-shape, a further connection piece is arranged, which is not coupled to the body. The thus arranged connecting pieces are then arranged at the same time in a row, which is advantageous in relation to the overall arrangement to be produced. The L-shape of the body is particularly preferably designed with a long and a short leg. The long leg or arm of the body is preferably provided for arranging the return element in the above-mentioned manner. The restoring element can then be made particularly long, in particular in the form of a bimetallic leaf spring. The short leg, however, creates a short connection to the adjacent connection piece.

In a further advantageous embodiment of the filter device according to the invention, the sealing element is urged by a neck portion of the body and a neck portion of the filter element from the inside against the filter housing.

With the said neck pieces, a defined line-shaped contact pressure of the sealing element can be generated around the circumference of the respective connecting piece. This contact pressure leads to an overall advantageous sealing, without the need for particularly large pressure forces.

According to a further advantageous development of the filter device according to the invention, the first connecting piece is provided for coupling a line for supplying fuel from a high-pressure fuel pump to the filter device and the second connecting piece for coupling a line through which the fuel purified by the filter device arrives at an internal combustion engine.

Thus, two supply ports and a discharge port are provided in the filter device. These connections are in the form of Designed connecting pieces, which open into the interior of the filter housing. A first of the two supply ports supplies fuel from a fuel tank to the filter element while the second supply port carries fuel from the return of a high pressure fuel pump to the filter device. At normal operating temperature, fuel is only introduced from the fuel tank through the first supply port into the filter device. However, when the temperature inside the filter device is very low (such as during a cold start of the associated motor vehicle), a valve opens the second supply port in the interior of the filter device, thus allowing fuel into the filter device The high-pressure fuel pump comes and therefore is relatively warm. The two fuel flows thus supplied mix in the filter device in the flow direction even before the filter element, so that overall properly tempered fuel can pass through the filter element. When the temperature of the fuel has reached a predetermined temperature, the valve closes and only fuel from the first supply port enters the filter device. To close the valve, a valve body is fluid-tightly applied against an associated valve seat. To open the valve, the valve body is actively lifted from the valve seat with a return element and in this way a fluid connection is made through the valve seat. The return element is preferably designed as a bimetallic leaf spring, which is movable in particular at one end and there passes with a finger or pin portion through the valve seat to press on its opposite side against the valve body. The bimetal leaf spring deforms depending on the prevailing temperature in their environment. In this case, the bimetallic leaf spring is arranged such that it is surrounded by the fuel supplied to the filter device from the fuel tank. Accordingly, the temperature of the fuel supplied from the fuel tank determines when the valve opens and closes. At high or sufficient temperature, the valve is locked, at low or too low temperature, the valve is opened and mixed fuel from the high-pressure fuel pump.

An exemplary embodiment of the solution according to the invention will be explained in more detail below with reference to the attached schematic drawings. It shows:

1 a perspective top view of a filter device according to the invention,

2 the view according to 1 with removed filter housing cover,

3 the view according to 2 with removed sealing element,

4 the section IV-IV in 3 in perspective view from below,

5 the view V according to 4 and

6 a perspective view of the sealing element in an enlarged scale.

In the figures is a filter device 10 shown for filtering fuel. The filter device 10 is with a cartridge-shaped filter housing 12 designed, which consists of a filter housing cup 14 and a filter housing cover closing it 16 is formed.

On the filter housing cover 16 are outwardly substantially vertically protruding three connecting pieces 18 . 20 and 22 arranged. Of these serves the connecting piece 20 (as so-called first port) for supplying fuel from a (high-pressure) fuel pump, not shown, to the filter device 10 , and the connecting piece 22 serves (as a so-called second connection piece) for coupling a line through which of the filter device 10 cleaned fuel passes to an internal combustion engine, not shown. The connecting piece 18 serves (as a so-called third port) for supplying fuel from a fuel tank, not shown, to the filter device 10 ,

Under the filter housing cover 16 is in accordance with 2 a flat or plate-shaped sealing element 24 in the form of a felt or sealing felt and a body 26 and below to the bottom of the filter housing cup 14 reaching filter element 28 ,

In the body 26 is under the spigot 20 (please refer 4 ) a valve 30 formed with one piece with the body 26 designed annular valve seat 32 and a spherical valve body 34 is formed. In this case, the connecting piece protrudes 20 with its one end area in the body 26 into it and is there with a holding structure 36 in the form of on the body 26 held in one piece fingers.

With the valve 30 is a switching device created by means of a fuel flow through the connection piece 20 through and into the filter device 10 can be optionally admitted or prevented. To block the flow is the valve body 34 at the valve seat 32 whereas the current is released when the valve body 34 from the valve seat 32 as in 4 shown lifted off.

The lifting of the valve body 34 from the valve seat 32 takes place by means of a return element 38 in the form of a bimetallic leaf spring, with a lifting finger 40 through the valve seat 32 referred to 4 from below under the valve body 34 attacks.

The valve body 34 is at the valve seat 32 by means of one with the body 26 and thus integrally formed with the valve seat retention structure 42 in the form of three around the valve body 34 at regular intervals around arranged cams 43 retained. With the retention structure 42 is the valve body 34 after its installation, which by simply clicking the valve body 34 between the cams 43 is done on the body 26 retained and secured in this way against falling out. The valve body 34 Thus, it can not be lost during the assembly chain following the assembly and the transport processes taking place. Further, the valve body 34 for the entire subsequent manufacturing process and also for the subsequent operation on the body 26 kept safe. At the same time, the valve body can 34 during operation by the required stroke from the valve seat 32 take off.

The thus designed, very advantageous holder for the valve body 34 is realized with almost no extra effort by the cams 43 the retention structure 42 simply in an injection molding process to make the body 26 have been trained with. The cams 43 are made slightly elastic by suitable choice of material.

The retention structure 42 further limits the stroke of the valve body 34 , so that this has a particularly fast closing and opening behavior.

The three cams 43 the retention structure 42 stop the valve body 34 positively at its the valve seat 32 opposite or opposite side, so that the valve body 34 in a limited space relative to 4 above the valve seat 32 is restrained.

The holding structure 36 has also been formed in a cost effective manner in said injection molding with. The connection piece held in it 20 is plugged in, clamped and thereby held strong.

The body 26 also serves to attach the return element 38 , This is in the return element 38 an opening 44 formed by the material 46 of the body 26 passes through, in this way the return element 38 to hold positively (see 5 ). In this way, a positive connection is made in the manner of riveting.

The reset element 38 raises the valve body 34 from the valve seat 32 actively by deforming in the region of its longitudinal extent due to a change in temperature. The deformation thus takes place in dependence on the environment of the restoring element 38 prevailing temperature. In this environment is that fuel that is supplied from the fuel tank.

Accordingly, at high or sufficient temperature of the fuel from the fuel tank, the valve 30 locked, at low or too low temperature becomes the valve 30 however, from the reset element 38 by lifting the valve body 34 from the valve seat 32 open. It can then be warm fuel from the fuel pump into the top of the filter housing 12 be admixed, reducing the temperature of the filter element 28 supplied fuel can be raised to the required value.

The body 26 is directly on the inside of the filter housing cover 16 mounted there and provides the connection option for the three connecting pieces 18 . 20 and 22 ready.

The sealing element 24 is between the body 26 and the filter housing cover 16 arranged to suitably the connecting pieces 20 and 22 together at least with respect to the filter element 28 seal. In particular, a part of the sealing element seals 24 , which around the connecting piece 22 lying around, opposite a central neck piece 48 off, with the filter element 28 from the inside against the sealing element 24 is urged.

Fuel can thus escape from the filter element 28 through the neck piece 48 through into the connecting piece 22 stream. By the so-sealed neck piece 48 of the filter element 28 So the flow path of the fuel is within the filter housing 12 directed so that no fuel is unfiltered on the filter element 28 can flow past.

The body 26 is in L-shape with two thighs 50 and 52 is designed, with the connecting pieces 18 and 20 at the free ends of the thighs 50 respectively. 52 are located. At the thus L-shaped body 26 So first and second are the connecting pieces 18 such as 20 coupled and in the apex area of the L-shape is third, the connection piece 22 arranged, this being not in fluid communication with the body 26 stands, but fuel from the throat 48 leads to the outside.

In the L-shaped body 26 is an interior 54 formed as a mixing space for the merging and mixing of the through the connecting piece 18 and 20 supplied fuel flows is used. Furthermore, the reset element 38 the interior 54 covering at the long thigh 52 of the body 26 arranged.

The body 26 is from the filter element 28 also from the inside against the filter housing cover 16 crowded and sealed around the connection piece 20 around with a neck piece 56 opposite the sealing element 24 from. The sealing element 24 So it's from the neck pieces 48 and 56 also from the inside against the filter housing cover 16 urged and seals accordingly also opposite the inside of the filter housing cover 16 from.

In this case, the sealing element 24 two through holes 58 and 60 on, of which the first through hole 58 is designed circular in cross section and in the inner portion of the connecting piece 22 receives. The second passage opening 60 is at its periphery with three regularly spaced, over the entire thickness of the sealing element 24 extending notches 62 designed. These scores 62 form recesses in the radial direction with remaining increases therebetween, which then at the from the passage opening 60 received connection piece 20 issue. Because of the notches 62 seals the sealing element 24 but not directly opposite the spigot 20 Instead, it is instead in the assembly of the sealing element 24 possible that this is particularly easy and compensating for dimensional tolerances with its two through holes 58 and 60 inside on the connecting pieces 22 respectively. 20 can be deferred.

Claims (10)

Filter device ( 10 ) with a filter element ( 28 ) housed in a filter housing ( 12 ) is arranged at the at least one first connecting piece ( 20 ) and a second connecting piece ( 22 ) are connected, characterized in that in the interior of the filter housing ( 12 ) a sealing element ( 24 ) is provided, with which the first connecting piece ( 20 ) and the second connecting piece ( 22 ) together at least to the filter element ( 28 ) are sealed off. Filter device according to claim 1, characterized in that the sealing element ( 24 ) is made of a sealing felt. Filter device according to 1 or 2, characterized in that the sealing element ( 24 ) disc-shaped, each with a passage opening ( 60 ; 58 ) for the first connecting piece ( 20 ) and for the second connecting piece ( 22 ) is designed. Filter device according to claim 3, characterized in that at least one passage opening ( 60 ) of the sealing element ( 24 ) at its periphery with at least one notch ( 62 ) is designed. Filter device according to one of claims 1 to 4, characterized in that the sealing element ( 24 ) with the filter element ( 10 ) from the inside against the filter housing ( 12 ) is urged. Filter device according to one of claims 1 to 5, characterized in that the sealing element ( 24 ) with the filter element ( 28 ) from the inside against a filter housing cover ( 16 ) is urged. Filter device according to one of claims 1 to 6, characterized in that except the filter element ( 28 ) another body ( 26 ) in the filter housing ( 12 ) is arranged and with the sealing element ( 24 ) one of the connecting pieces ( 20 ) to the body ( 26 ) is sealed off. Filter device according to claim 7, characterized in that the body ( 26 ) of the filter element ( 28 ) against the sealing element ( 24 ) is urged. Filter device according to one of claims 1 to 8, characterized in that the sealing element ( 24 ) of a neck piece ( 56 ) of one or the body ( 26 ) as well as a neck piece ( 48 ) of the filter element ( 28 ) from the inside against the filter housing ( 12 ) is urged. Filter device according to one of claims 1 to 9, characterized in that the first connecting piece ( 20 ) for coupling a line for supplying fuel from a fuel pump to the filter device ( 10 ) and the second connecting piece ( 22 ) is provided for coupling a line through which the of the filter device ( 10 ) gets cleaned fuel to an internal combustion engine.

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