DE102017002421A1 - arrangement - Google Patents

Abstract

Arrangement (1) with an elastomer sealing element (3) which is arranged in a sealing element receptacle (5) of the arrangement (1) and arranged between a first (7) and a second (9) body of the arrangement (1) opposite a media attack side ( 11) seals, characterized in that the elastomeric sealing element (3) in the direction of the media attack side (11) is preceded by a filler (17) in the sealing element receptacle (5) towards the media attack side (11) barrier-forming.

Description

The present invention relates to an arrangement according to the preamble of claim 1.

In the prior art, eg according to 1 , generic arrangements are known in which an elastomeric sealing element, in particular an O-ring, arranged between two bodies seals against a medium. The problem is often that just in aggressive media such as heavy oil can not be resorted to cheap materials for the sealing element, as they can not ensure the chemical resistance in the rule.

Proceeding from this, it is an object of the present invention to provide an arrangement of the aforementioned type which overcomes these disadvantages.

This object is achieved by an arrangement having the features of claim 1.

Advantageous developments and embodiments of the invention are specified in the further claims.

According to the invention, an arrangement is proposed, in particular for use in application environments with liquid fuel, e.g. Diesel fuel, bio-oil or heavy oil. The arrangement can preferably be used with a (high-pressure) fuel pump, more particularly in the context of an internal combustion engine such as a large engine, in this case e.g. in the context of a fuel injection system of such. A large engine formed with the arrangement or the fuel pump may be used for a motor vehicle such as a motor vehicle. a ship, a locomotive or a utility or special vehicle are provided, or be provided for example for a stationary device, e.g. for a combined heat and power plant, an (emergency) generator, e.g. also for industrial applications. The arrangement can also be used in a variety of alternative application environments in which to seal against aggressive media, e.g. in the context of heating systems, in plants of the chemical industry etc.

Proposed is an arrangement with an elastomeric sealing element, which is arranged in a sealing element receiving the arrangement. In the context of the present invention, the elastomeric sealing element may advantageously be made of a relatively inexpensive elastomer, for example of FKM (fluororubber). The sealing element receptacle is furthermore preferably formed as a chamber, in particular surrounded on all sides (essentially encapsulating the elastomer sealing element in its entirety).

Arranged in the sealing member receptacle, in the proposed arrangement, the elastomeric sealing member seals between a first and a second body (eg, first and second member or member) of the assembly opposite a media attack side (the assembly). Preferably, the bodies can form the sealing element receptacle with one another here, furthermore, a respective body can be formed in one or more parts. In this case, the media attack side is furthermore in particular a side on the sealing element receptacle or the arrangement on which the medium against which is to be sealed is present (the sealing element sealing in particular between the bodies against overflow of the medium via the sealing element).

In the invention characterizing manner, in the proposed arrangement, the elastomeric sealing element in the direction of the media attack side now further precedes a filler in the sealing element receiving towards the media attack side barrier-forming. Such a filler is preferably a viscous, furthermore in particular higher or highly viscous filler, for example and preferably silicone grease, a release paste or a mounting paste. Preferably, the filler is also temperature resistant, for example, beyond 200 ° C.

With this embodiment, it is advantageously possible to overcome the disadvantages mentioned at the outset, since access to or contact with an aggressive medium (the media attack side) to or with the elastomer sealing element can be prevented in a simple manner by the preliminary storage of the filler barrier. Even if the contact can not be completely avoided, at least the aggressiveness of the medium can be advantageously reduced, since its concentration, in particular for example in the case of a medium in the form of heavy oil, can be reduced by mixing with the filler used as barrier. As a result, cost-intensive sealing materials, such as FFKM (perfluororubber) can advantageously be dispensed with with the invention and / or the load limit and the life span of conventional elastomers can be increased. In addition, the technical feasibility is advantageous extremely simple.

In general, the elastomeric sealing element in the context of the present invention is preferably an annular sealing element, preferably an O-ring. This preferably involves the design of the sealing element receptacle as an annular chamber, for example formed by means of an annular groove, for example in one of the bodies, and a covering element, for example formed by the further body of the arrangement. However, an embodiment of the arrangement is also conceivable with it various elastomer sealing elements, for example linear or generally application-specific molded elastomeric sealing elements (the sealing element receiving again preferably has a correspondence shape).

In a further development of the invention, the arrangement may in particular be designed in such a way that the elastomeric sealing element arranged in the sealing element receptacle between the first and the second body of the arrangement further seals against a further media attack side (the arrangement), in particular with respect to the elastomeric sealing element opposite the media attack side (ie In this case the elastomeric sealing element in the direction of the further media attack side may also be preceded by a barrier in the sealing element receptacle towards the further media attack side, preferably once again a filler of the aforementioned type.

With such a configuration it can be provided, for example, that the filler upstream of the media attack side is the same or different from the filler upstream of the further media side, so that advantageously different properties of the media of both media attack sides can be taken into account within the filler selection. In the context of the present invention, a respective filler is preferably chemically inert to the medium at the associated media attack side and also to the elastomer of the elastomer sealing element.

With an embodiment as discussed above, therefore, an improved media separation of two different media can be effected by the elastomeric sealing element, since the possibility of any contact of the media among each other via the sealing element receptacle is advantageously minimized by the respective upstream barriers, the concentration in the manner discussed above, further advantageous herabsetzbar ,

In general, it is further provided in the context of the present invention for the elastomer sealing element to seal at a separating gap between the first and the second body relative to the media attack side or also the further media attack side (in this case the respective medium urges over the separation gap, in particular in the direction of the sealing element receptacle).

For introducing the filler, preferably pressurized, into the sealing element receptacle, the arrangement may have a filling channel or a number of filling channels. A respective one may be guided by one or both bodies towards the sealing element receptacle for filling the same with the at least one filler, in particular configured for engagement by a filler injection means. Alternatively, for example, provision may also be made for introducing the respective filler into the sealing element receptacle prior to assembly of the bodies (for example with a surplus of volume, so that, in the context of crushing (by the bodies during assembly), a particularly pressure-resistant, upstream barrier results).

Also proposed in the context of the present invention is a fuel pump and an internal combustion engine which have at least one arrangement as discussed above.

Further features and advantages of the invention will become apparent from the following description of embodiments of the invention, with reference to the figures of the drawings, which show details essential to the invention, and from the claims. The individual features may be implemented individually for themselves or for a plurality of different combinations in a variant of the invention.

• 1 exemplarisch und schematisch eine Anordnung aus dem Stand der Technik.
• 2 exemplarisch und schematisch eine Anordnung in einer abgebrochenen Schnittansicht gemäß einer bevorzugten Ausführungsform der Erfindung.
• 3 exemplarisch und schematisch eine Anordnung in einer abgebrochenen Schnittansicht gemäß einer weiteren bevorzugten Ausführungsform der Erfindung.
• 4 exemplarisch und schematisch eine abgebrochene und teilgeschnittene Ansicht einer Kraftstoffpumpe mit einer erfindungsgemäßen Anordnung.

Preferred embodiments of the invention are explained below with reference to the accompanying drawings. Show it:

• 1 exemplary and schematically an arrangement of the prior art.
• 2 exemplary and schematic arrangement in a broken sectional view according to a preferred embodiment of the invention.
• 3 exemplary and schematically an arrangement in a broken sectional view according to another preferred embodiment of the invention.
• 4 an example and schematically a broken and partially sectioned view of a fuel pump with an inventive arrangement.

In the following description and the drawings, the same reference numerals correspond to elements of the same or comparable function. Elements of the prior art are provided with primed reference numerals.

1 shows a generic arrangement 1' from the prior art in a broken sectional view.

The order 1' includes an elastomeric sealing element 3. ' in the form of a ring seal or an O-ring, which in a sealing element recording 5 ' the arrangement 1' is arranged. The sealing element holder 5 ' is formed here as an annular chamber, in particular by means of a first 7 'and a second 9' body of the arrangement 1' , wherein the sealing element receptacle 5 ' is dimensioned so that the elastomeric sealing element 3. ' by means of the first 7 'and second 9' body is pressure-loaded or compressed and thus between the first 7 'and the second 9' body of the arrangement 1' opposite (on) a (first) media attack page 11 ' seals, in particular against overflow via the elastomeric sealing element 3. ' away (on the part of a dividing line 13 ' in the sealing element holder 5 ' penetrating medium of the media attack site 11 ' ).

Problematic with this arrangement 1' However, that is the elastomeric sealing element 3. ' from the media attack site 11 ' comes into contact with the medium, for example at the positions shown (arrows A ' ), and with an aggressive medium on the media attack side 11 ' that can be massively attacked. To prevent such damage, an expensive and elastomeric sealing element must alternatively and disadvantageously be used 3. ' used, for example, made of expensive FFKM (eg by a factor 5 -10 more expensive than FKM).

2 now shows a first possible embodiment of an arrangement according to the invention 1 ,

The order 1 also includes an elastomeric sealing element 3 in the form of a ring seal or an O-ring, which in a (correspondence) sealing element receptacle 5 of the arrangement 1 is arranged. The sealing element holder 5 is in this respect formed as an annular chamber, in particular by means of a first 7 and a second body 9 of the arrangement 1 , For example, each as (housing) element of a fuel (piston) pump 15 (eg 4 ) or a different superordinate structural unit.

The sealing element holder 5 is by means of an annular groove in the first body 7 formed (alternatively, for example, in the second body 9 ), that is on a front side thereof, wherein the second body 9 (Alternatively, according to the first body 7 ) the annular groove with completion of the sealing element recording 5 deckelt. Again, the sealing element recording 5 so dimensioned that the elastomeric sealing element 3 by means of the first 7 and the second 9 body is pressure-loaded or compressed (axial, in the impact direction of the body 7 . 9 ) and thus between the first 7 and the second 9 body of the arrangement 1 opposite (or on) a media attack page 11 (the arrangement 1 ) seals. Insofar seals the elastomeric sealing element 3 also in the inventive arrangement 1 against overflow of a medium via the elastomeric sealing element 3 between the bodies 7 . 9 , in the present case again against overflow of a separating gap 13 between the first 7 and second 9 body in the direction of sealing element recording 5 urgent medium (starting from the media attack page 11 ).

As 2 now further illustrated is in the arrangement 1 the elastomeric sealing element 3 towards the media attack page 11 According to the invention, a filler 17 in the sealing element holder 5 towards the media attack page 11 barrier-forming upstream. The barrier-forming, upstream filler 17 can advantageously prevent that from passing over the separating gap 13 in the direction of sealing element holder 5 urging medium, for example heavy oil, in contact with the elastomeric sealing element 3 can reach (barrier), so that the aggressiveness of the medium for the durability or durability of the elastomeric sealing element 3 no longer plays a significant role. Even if the medium on the part of the media attack site 11 in contact with the elastomeric sealing element 3 should, the aggressiveness of the medium can be advantageous by the contact with the filler 17 be lowered.

In order to achieve the aforementioned advantages and effects according to the invention in particular all, in the embodiment shown, on the one hand, A) is the sealing element receptacle 5 compared to the prior art (slightly) enlarged or widened (viewed radially), so that sufficient filling space for the filler in the sealing element recording 5 B) the elastomeric sealing element 3 this against the media attack page 11 opposite side 19 the sealing element recording 5 crowded and C) the filling space 21 in the sealing element holder 5 between the media attack page 11 and the elastomeric sealing element 3 preferably completely with the filler 17 filled, in particular pressurized, preferably by pressing the same, wherein the filler 17 also a little way into the separation gap 13 into it (towards the media attack side 11 ).

The filler 17 is in particular a viscous, in particular higher or high viscosity filler, more particularly fat or a paste, preferably for example silicone grease. General is the filler 17 in particular chemically inert to both the medium of the media attack side 11 as well as the elastomer of the elastomeric seal 3 , Especially in application environments of the device 1 with high temperature load, such as fuel pumps 15 is provided that the temperature resistance of the filler 17 beyond 200 ° C or even beyond.

As 2 also illustrated, is for filling or pressing in the filler 17 in the Sealing element receptacle 5 a filling device 23 at the arrangement 1 formed, which has a filling channel 25 which extends through one of the bodies 7 . 9 , in this case, for example, the second body 9 , extends. The filling device 23 includes filler feed side further recording 27 at the inlet of the filling channel 25 , in which a press-in tool for pressurized introduction of the filler 17 can be brought into engagement, wherein the - acting as a reservoir - recording 27 furthermore with a (screw) plug 29 of the filling device 23 is capped. With increasing screw-in depth of the screw plug 29 can the injected filler 17 also be pressurized (for example, to compensate for fading). The filling channel 25 may for example be formed by means of one or more drilling channels.

3 now shows a further advantageous embodiment of an arrangement 1 , wherein in the sealing element receptacle 5 arranged elastomeric sealing element 3 between the first 7 and second 9 bodies of the assembly 1 continue towards another (second) media attack page 31 (the arrangement 1 ), in particular with respect to one on the elastomeric sealing element 3 to the (first) media attack page 11 opposite another media attack page 31 , Evident is the elastomeric sealing element 3 this also in the direction of the other media attack page 31 a filler 17 in the sealing element holder 5 towards the other media attack page 31 barrier-forming upstream. With this arrangement 1 succeeds in a simple way, the elastomeric sealing element 3 effectively protect both the first 11 and the second 31 media attack page in an as required case against aggressive media, as the on both sides of the elastomer sealing element 3 barrier-forming, upstream filler 17 Also here it is possible to prevent that over the separation gap 13 on both sides in the direction of sealing element holder 5 urgent media, for example heavy fuel oil and diesel fuel, in contact with the elastomeric sealing element 3 can reach (barrier). However, if contact can not be completely avoided, the respective filler can 17 but at least above for the embodiment according to 2 described, advantageous way to reduce the harmful effect of the media.

In such a configuration, preferably in turn, along with a wider dimensioning of the sealing element recording 5 compared with the prior art, furthermore preferably with the center arrangement of the elastomeric sealing element 3 with respect to the sealing element receptacle 5 , Can be provided, the filling spaces 21a, b on both sides of the elastomeric sealing element 3 with the same (as in 3 shown) or two different fillers 17 to fill (not shown), in particular depending on the media of the respective media attack page 11 . 31 against which is to dense. In that regard, in this case, a first filler 17 which is against the medium of the first media attack page 11 as well as against the elastomer of the elastomeric seal 3 is chemically inert, further a second filler 17 which is against the medium of the second media attack page 31 and again against the elastomer of the elastomeric sealing element 3 is chemically inert.

When filling with the same filler 17 can have a number of fill channels 25 for example, two, from a single filler inlet of a filling device 23 to the Füllstoffräume 21a, b on both sides of the elastomeric sealing element 3 be supplied. When filling the filling spaces 21a, b with different fillers 17 For example, two fillers 23 be provided (not shown).

4 now shows a broken partially cutaway view of a fuel pump 15 , in particular a (high-pressure) fuel pump, and further in particular the Hubkolbenbauart, which analogous to the embodiment according to 2 arranged arrangement 1 having.

The arrangement is clear 1 in this case by means of a first body 7 in the form of a pump housing element, in particular in the form of a ring body (a pump cylinder housing 33 surrounding), as well as by means of a second body 9 in the form of a pump shell or a connecting piece. For barrier formation against the medium of the (first) media attack page 11 , with the fuel pump in particular heavy fuel, is the filler 17 in the sealing element holder 5 apparent to the elastomeric sealing element 3 towards the media attack site 11 upstream, the heavy oil part of the separation gap 13 (continued across the gap 35 ) in the direction of the sealing element holder 5 urges. The first body 7 and the second body 9 are permanently attached to each other, for example, screwed, so that the arrangement 1 maintains its configuration permanently. A filling device 23 here is an example of the first body 7 formed shown.

LIST OF REFERENCE NUMBERS

1, 1 '

arrangement

3, 3 '

Elastomeric sealing element

5, 5 '

Sealing element receptacle

7, 7 '

first body

9, 9 '

second body

11, 11 '

Media wing

13, 13 '

separating gap

15

Fuel pump

17

filler

19

opposite side

21

filling space

23

filling

25

filling channel

27

admission

29

Plug

31

further media attack page

33

Pump cylinder housing

35

gap

A '

Contact positions

Claims (11)

Arrangement (1) with an elastomer sealing element (3), which is arranged in a sealing element receptacle (5) of the arrangement (1) and arranged between a first (7) and a second (9) body of the arrangement (1) opposite a media attack side ( 11) seals, characterized in that - the elastomeric sealing element (3) in the direction of the media attack side (11) is preceded by a filler (17) in the sealing element receptacle (5) towards the media attack side (11) barrier-forming. Arrangement (1) according to Claim 1 , characterized in that - the elastomeric sealing element (3) is an annular sealing element; and / or - the sealing element receptacle (5) is formed as an annular chamber; and / or - the filler (17) is viscous, especially highly viscous. Arrangement (1) according to one of the preceding claims, characterized in that - in the sealing element receiving (5) arranged elastomeric sealing element (3) between the first (7) and the second body (9) of the arrangement (1) further in relation to a further media attack side (31) seals, in particular on the elastomeric sealing element (3) to the media attack side (11) opposite, wherein the elastomeric sealing element (3) toward the further media attack side (31) also a filler (17) in the sealing element receiving (5) towards the further media attack side (31 ) is upstream barrier-forming. Arrangement (1) according to Claim 3 , characterized in that - in the direction of the media attack side (11) upstream filler (17) is equal to or different from the upstream in the direction of the further media attack side (31) filler (17). Arrangement (1) according to one of the preceding claims, characterized in that - the elastomer sealing element (3) at a separating gap (13) between the bodies (7, 9) against the media attack side (11) or the other media attack side (31) seals. Arrangement (1) according to one of the preceding claims, characterized in that - a medium on the media attack side or the further media attack side is a fuel, in particular heavy oil. Arrangement (1) according to one of the preceding claims, characterized in that - a respective filler (17) is chemically inert to the medium at the associated media attack side (11, 31) and to the elastomer of the elastomeric sealing element (3). Arrangement (1) according to one of the preceding claims, characterized in that - at least one of the fillers (17) is a silicone grease. Arrangement (1) according to one of the preceding claims, characterized in that - a filling channel (25) or a number of filling channels (25) through one or both body (7, 9) towards the sealing element receiving (5) for filling the same with the at least a filler (17) is or are, in particular configured for engagement by a Füllstoffeinpressmittels. Fuel pump (15), characterized in that - the fuel pump (15) has at least one arrangement (1) according to one of the preceding claims. Internal combustion engine, characterized in that - the internal combustion engine at least one arrangement (1) according to one of Claims 1 to 9 or a fuel pump (15) after Claim 10 having.

Images