DE102015218388A1 - Ring filter element of a fuel filter - Google Patents

Abstract

The invention relates to a ring filter element (1) of a fuel filter (3) having an annular filter body (4) and a first and a second end disk (5, 6). It is essential to the invention that an end separator (8) with a tubular holder (9) and a hydrophobic end separator screen (10) is arranged in an interior (7) of the ring filter element (1), that the holder (9) with the first end plate (5) is in contact or connected thereto, - that on the holder (9) at least two at least partially integrally formed therewith bypass valves (11) are formed, which communicate with corresponding openings (12) in the first end plate (5) are connected and in the open state allow the filter body (4) bypass bypass, - that the bypass valves (11) in an annular space (13) between the filter body (4) and the holder (9) are arranged.

Description

The present invention relates to a ring filter element of a fuel filter with an annular filter body and a first and a second end plate according to the preamble of claim 1. The invention also relates to a filter device with such a ring filter element.

Generic ring filter elements are well known and are used in almost all modern fuel filters.

From the DE 602 11 323 T2 For example, a fuel filter with a generic ring filter element and an additional pump is known, wherein a flow path from an inlet through the ring filter element, the pump and then to an outlet and wherein the fluid passes this flow path when the pump is ready. Also provided is a bypass valve which is responsive to pressure from the pump and normally occluded when the pump is operational and only opens when the pump is inoperative, then to provide a bypass flow path from the inlet through the filter element and then through the bypass valve Outlet provides.

From the DE 10 2011 005 106 In turn, a generic ring filter element with a arranged in an interior bypass valve is known.

In general, fuels, in particular diesel fuels, can produce a so-called fuel turbulence at low temperatures, as a result of which paraffin constituents precipitate out of the fuel and block a filter medium.

A filtration performance is no longer given or at least greatly reduced. In addition, due to the blockage of the filter medium, the pressure drop increases sharply. If the temperature rises again due to the warm engine return, the paraffin constituents dissolve and the filter medium is again continuous. In order to still have a fuel flow in a so-called cold start, a bypass valve can be provided, which bypasses this with clogged filter medium. However, since a hydrophobic end separator strainer is used in diesel fuel filter devices, in particular for improved water separation, there is usually no room for a classic central bypass valve since this space is already occupied by the end separator strainer.

The present invention therefore deals with the problem of providing an improved or at least one alternative embodiment for a ring filter element of the generic type, which in particular allows a space-saving and space-saving arrangement of a bypass valve in a ring filter element with a Endabscheider.

This problem is solved according to the invention by the subject matter of independent claim 1. Advantageous embodiments are the subject of the dependent claims.

The present invention is based on the general idea of arranging not only an end separator for water separation in an interior of a ring filter element, but at the same time at least two comparatively small bypass valves, which are communicatively connected to corresponding openings in a first end plate and in a comparatively small annular space between a Filter body and a tubular holder of the Endabscheiders find space. The ring filter element according to the invention is used in a fuel filter device and has the aforementioned annular filter body and a first and second end plate axially sealed off. According to the invention, the abovementioned end separator is now arranged in the interior of the ring filter element with the tubular holder and a hydrophobic Endabscheidersieb, wherein the holder is in contact with or connected to the first end plate and wherein on the holder at least two integrally formed therewith bypass valves are provided which are communicatively connected with their respective openings on the first end disk and in the open state allow a bypass flow bypassing the filter body. The at least two bypass valves are arranged in the released by the tubular holder and the annular filter body annulus. By means of this special embodiment of at least two but several bypass valves, it is possible for the first time to arrange them in the comparatively small available installation space, namely the annular space between the filter body and the tubular holder. In contrast to the prior art, in which only a single bypass valve was provided, the bypass valves according to the invention can now occupy this comparatively small space for the first time due to their significantly smaller size.

In an advantageous development of the solution according to the invention, a valve seat is formed on the at least two openings in the first end disk, against which a valve body of the respective associated bypass valve is biased. In this case, the bypass valve consists of a spring and the valve body, which are arranged in a corresponding recess on the holder during the associated valve seat is arranged at the associated opening in the first end disk. According to the inventive concept, the bypass valve is of course also formed on the holder, wherein, however, a part of the bypass valve, namely the valve seat, not on the holder, but is arranged separately thereto at the respective passage opening of the first end plate. Alternatively, it is also conceivable that a valve seat of the respective bypass valve is formed directly on the holder, so that in this case the entire bypass valve is formed on the holder. By the first embodiment, in which valve seats are formed on the associated openings of the first end plate, they can qualitatively highest and comparatively easy, namely produced in a simple and inexpensive plastic injection molding process together with the first end plate.

In an advantageous development of the solution according to the invention, the at least two bypass valves in the opened state have a flow cross-section of different sizes. This makes it possible, for example, to be able to realize differently sized bypass flows via different bypass valves.

In a further advantageous embodiment of the solution according to the invention, the at least two bypass valves have a different size opening resistance. This makes it possible to effect a pressure stage-dependent opening of the at least two bypass valves, so that, for example, only the first bypass valve opens and, in the case of an increasingly clogged filter body, also the second bypass valve. Of course, it is also possible to arrange more than two bypass valves, in particular three bypass valves. These can be arranged, for example offset by 120 ° on the outside of the tubular holder and thereby at the same time form positioning elements that hold the Endabscheider centrally in the interior of the ring filter element. For this purpose, it is only necessary that the bypass valves come into contact with the filter body on its radially outer side. Of course, the bypass valves can also be formed significantly smaller than an inner diameter of the filter body, in which case, for example, a positioning contour may be provided on the associated end plate, which cooperate with corresponding counter contours on the holder of Endabscheiders and thereby the central positioning of the Endabscheiders in the interior of the ring filter element take.

In an advantageous development of the solution according to the invention, the holder, the at least two bypass valves and the Endabscheidersieb form a prefabricated module. This is particularly favorable since in this case the final separator can be completely pre-assembled and inserted into the respective ring filter element in the preassembled state.

Suitably, the Endabscheidersieb connects axially to the tubular holder of the Endabscheiders and extends to the second, opposite end plate. This allows an axially exact positioning of the Endabscheiders in the interior of the ring filter element, since no axial movement possibility is given by a concern of the holder on the first end plate and a concern of the Endabscheidersiebes on the second end plate.

Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Preferred embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.

Show, in each case schematically,

1 a sectional view through an inventive ring filter element,

2 a representation like in 1 but in another cutting plane,

3 a view of the ring filter element according to the invention,

4 a view of an end of the ring filter element,

5 a sectional view through the according to the 4 shown Endabscheider,

6 a detail sectional view through a bypass valve of Endabscheiders,

7 a detailed view of the end separator in the area of the bypass valves,

8th a top view from the top of the Endabscheider.

According to the 1 to 3 has a ring filter element according to the invention 1 one only in the area of a filter housing 2 indicated fuel filter 3 an annular filter body 4 with a first end disc 5 and a second end plate 6 on. According to the invention is now in an interior 7 of the ring filter element 1 an end separator 8th (See in particular the 4 to 8th ) with a tubular holder 9 and a hydrophobic end separator 17 arranged. The holder 9 stands with the first end disc 5 in contact or is connected to this, for example, glued, welded or even executed in one piece with this. On the holder 9 itself are at least two integral with this bypass valves 11 arranged with corresponding openings 12 in the first end disk 5 are communicatively connected and in the open state, a filter body 4 allow immediate bypass flow. The bypass valves 11 are so small that they are in through an inner surface of the filter body 4 and an outer circumferential surface of the holder 9 limited annulus 13 find space easily.

Usually, the entire bypass valves are 11 , consisting of spring 14 , Valve body 15 and valve seat 16 (see. 6 ) in one piece with the holder 9 formed, wherein alternatively also conceivable that an associated valve seat of the bypass valve 11 at the opening 12 the first end disk 5 is arranged, which, for example, this comparatively easily by a simple modification of a plastic injection molding tool can be manufactured inexpensively and of high quality.

At least two of the bypass valves 11 , according to the 1 to 8th in the present case are each three bypass valves 11 provided in the open state, a different sized flow cross-section and thus a different size bypass flow, which the filter body 4 bypasses, effect. It can also be provided that the at least two bypass valves 11 have a different size opening resistance, so that a pressure stage-dependent bypassing of the filter body is possible. For this purpose, for example, with only a slight clogging of the filter body 4 first a first bypass valve 11 opened and with increasing degree of clogging, the other bypass valves 11 ,

Looking at the bypass valves 11 according to the 4 such as 7 and 8th , it can be seen that these offset by 120 ° each outside of the tubular holder 9 are arranged. The actual Endabscheidersieb 10 closes axially to the tubular holder 9 and extends to the second end plate 6 , whereby the final separator 8th between the two end discs 5 . 6 can be fixed.

In general, it can also be provided that the holder 9 that has at least two bypass valves 11 and the Endabscheidersieb 10 a prefabricated assembly 18 form (see the 4 and 5 ), which can be pre-assembled separately and in particular checked, then in preassembled state in the interior 7 of the ring filter element 1 to be used. The hydrophobic end separator screen 10 can be circular over axial webs 17 to be excited.

With the ring filter element according to the invention 1 , lets a bypass valve 11 or here several bypass valves 11 to save space, since a single, relatively large bypass valve now in several small bypass valves 11 is split. By reducing the outside dimensions of the multiple small bypass valves 11 These can be in a previously unavailable for a larger bypass valve space, for example, in the annulus 13 , arrange easily. Here, in principle, the entire radial extent of the annulus 13 available according to the 1 and 2 the individual bypass valves 11 only a small part of the radial extent of the annulus 13 require, so that between these and an inner circumferential surface of the filter body 4 there is still an annulus. In theory, however, the bypass valves 11 Also be dimensioned such that these with the inner circumferential surface of the filter body 4 come into contact and thereby aligning the Endabscheiders 8th in the interior 7 of the ring filter element 1 cause.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 60211323 T2 [0003]
• DE 102011005106 [0004]

Claims (10)

Ring filter element ( 1 ) of a fuel filter ( 3 ) with an annular filter body ( 4 ) and a first and a second end plate ( 5 . 6 ), characterized in that - in an interior space ( 7 ) of the ring filter element ( 1 ) an end separator ( 8th ) with a tubular holder ( 9 ) and a hydrophobic Endabscheidersieb ( 10 ), - that the holder ( 9 ) with the first end plate ( 5 ) is in contact or connected to this, - that on the holder ( 9 ) at least two at least partially integrally formed with this bypass valves ( 11 ) are formed with corresponding openings ( 12 ) in the first end plate ( 5 ) are communicatively connected and in the open state a the filter body ( 4 ) allow immediate bypass, - that the bypass valves ( 11 ) in an annulus ( 13 ) between the filter body ( 4 ) and the holder ( 9 ) are arranged. Ring filter element according to claim 1, characterized in that at the at least two openings ( 12 ) in the first end plate ( 5 ) a valve seat ( 16 ) is formed, against which a valve body ( 15 ) of the respectively associated bypass valve ( 11 ) by means of a spring ( 14 ) is biased. Ring filter element according to claim 1, characterized in that a valve seat ( 16 ) of the respective bypass valve ( 11 ) on the holder ( 9 ) is arranged. Ring filter element according to one of the preceding claims, characterized in that the at least two bypass valves ( 11 ) in the open state have a different size flow cross-section. Ring filter element according to one of the preceding claims, characterized in that the at least two bypass valves ( 11 ) have a different size opening resistance. Ring filter element according to one of the preceding claims, characterized in that a total of three bypass valves ( 11 ) are provided, each offset by 120 ° outside of the tubular holder ( 9 ) are arranged. Ring filter element according to one of the preceding claims, characterized in that the Endabscheidersieb ( 10 ) axially to the tubular holder ( 9 ) and up to the second end plate ( 6 ) enough. Ring filter element according to one of the preceding claims, characterized in that the holder ( 9 ), the at least two bypass valves ( 11 ) and the Endabscheidersieb ( 10 ) form a prefabricated assembly. Filter device ( 3 ) with a ring filter element ( 1 ) according to any one of the preceding claims. Filter device according to claim 9, characterized in that the filter device ( 9 ) is designed as a fuel filter, in particular as a diesel fuel filter.

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