DE102011087375A1 - Component e.g. exhaust gas heat exchanger used in motor car, has surface that is provided with space region in which aggressive media are accommodated, and pad which is provided on surface of cup-like element - Google Patents

Abstract

The component (1) has a surface that is provided with a space region in which aggressive media are accommodated. A pad is provided on the surface of component or cup-like element (3). The corrosion-resistant property is larger than the cup-like element. The cup-like element is provided with a circulating seal surface.

Description

Technical area

The invention relates to a component, in particular a component of a heat exchanger, having a surface which delimits a spatial region in which aggressive media can be received or transmitted, preferably with a shell-like element, according to the preamble of claim 1.

State of the art

Heat exchangers are used for heat transfer between different media in a variety of configurations. Application examples of this can be found, for example, in motor vehicles, such as exhaust gas heat exchangers. In the process, more and more frequently chemically aggressive media are used for the heat transfer, so that they are also conducted through the heat exchangers accordingly. Since heat exchangers are made of good heat-conducting material, materials such as aluminum or aluminum alloys or copper or non-ferrous metals are preferred in the prior art. However, these materials are exposed to attacks of chemically aggressive media strong corrosion properties, so that the life of these heat exchangers can be significantly reduced depending on the materials used.

Alternatives to the use of aluminum in exhaust gas heat exchangers are, for example, heat exchangers made of stainless steel. However, these are significantly more expensive than aluminum heat exchangers in terms of material costs, the heat transfer does not take place as optimally as with aluminum, and the manufacturability of stainless steel heat exchangers is much more complicated and therefore more expensive than comparable aluminum heat exchangers.

To extend the life of heat exchangers, the coating of the surface of the heat exchanger has proven to be suitable. In this regard, be on the DE 2613588 in which a method for extending the service life of conduits and heat exchangers is disclosed, wherein an outer protective layer is applied to the starting material. This consists according to the document DE 2613588 from 10 to 70% of a refractory carbide with various admixtures. However, the application of such a carbide is associated with increased costs and a complicated announcement for application.

For components, for example, for heat exchangers, due to different fuel qualities on the world market, the necessary corrosion resistance depending on the fuel used quite different. Thus, fuel qualities exist, some of which are very aggressive, which causes a high aggressiveness to components, and these components would fail after a short life. Such aggressive fuels have, for example, very high sulfur content.

Since motor vehicles are typically used worldwide, they must not only be provided for the optimum fuel qualities or media, but the components used there must be designed for the worst fuel qualities or the most aggressive media. In principle, however, this would mean that the vehicles would have to be designed to the highest standard, even if only a small fraction of the vehicles used would be operated in those regions which would require these highest requirements.

However, these mentioned highest requirements on the components would significantly increase the unit costs, with no need for many applications.

The prior art is further known to protect surfaces from aggressive medians, such as exhaust gases due to fuels having aggressive chemical properties, coatings, or the above-mentioned coatings. However, these are very expensive, because the material costs or the application methods are very expensive, or they do not provide permanent long-term protection, because they are not permanently stable.

Presentation of the invention, object, solution, advantages

It is the object of the invention to provide a component, in particular a heat exchanger, with a surface which delimits a spatial region in which aggressive media can be received or transmitted, preferably with a shell-like element according to the preamble of claim 1, the cost of this Components are to be kept as low as possible and yet a long-term stable corrosion protection should be guaranteed where it is needed.

This is achieved with the features of claim 1, wherein an insert is arranged on the surface of the component or the shell-like element, which has more corrosion-resistant properties than the shell-like element itself. It is expedient if the insert is removable or replaceable.

Due to the material choice of the insert can become depending on need and occurrence of chemically aggressive Media of corrosion protection can be selected specifically. Thus, for example, in the case of a silicone or plastic insert, the chemical composition can be selected in such a way that corrosion protection which is sufficiently secure for the media used is ensured.

The provision of a liner can also be used advantageously to selectively provide only a certain number of components in a series production with the liner, so that these components are used in vehicles that are sold or used in regions that require more to show corrosion protection. The remaining other vehicles would be equipped with components that would not require increased corrosion protection.

It is advantageous if the shell-like element has a circumferential sealing surface. This has the effect that the shell-like element can be connected at connecting surfaces to other components, the covering also having a surface which protects against corrosion in the region of the sealing surface.

With regard to the use in example heat exchangers, it is expedient if the shell-like element has a tubular connecting piece, through which a medium can be flowed through. This allows the use of the component, for example, as a collection box or diffuser of a heat exchanger.

According to the invention, it is particularly advantageous if the insert completely covers the surface, preferably the inner surface of the component, so that a medium received or passed through in the component can not touch the surface of the component itself or react with it, but only with the surface of the component Deposit comes into contact. This ensures that the anti-corrosive liner comes into contact with the aggressive medium alone.

It is advantageous if the insert has the contour of the surface of the component or is adapted to this and this substantially completely covers and / or touched. This causes between the surface of the component and the liner no cavities or open spaces arise, in which gases, media or condensates can accumulate, which could lead to problems in continuous operation of the component.

Even in the presence of a connecting piece, the insert is advantageously equipped such that it also has a connecting piece covering a nozzle-like area, which is inserted into the connecting piece of the component and this covers. This allows that the connection piece itself is completely protected against corrosion by the insert.

It is also expedient if the component and the insert are connected to each other, in particular by positive connection elements or by cohesive bonding.

This causes a relative movement between the insert and the component as such is restricted or prevented as possible, so that the durability of the insert or the corrosion protection is thereby further increased.

It is advantageous that form-fitting connection elements are provided which produce a positive connection between the component and the insert, so that, for example, by the interaction of these connecting elements, the component and the insert are positively connected to each other at different points.

It is advantageous if the connecting elements are designed as projections or cams, which can engage in correspondingly adapted receiving elements.

Alternatively, it is advantageous if the insert is bonded by gluing to the component.

In the event that the insert is formed as an insertable component, positive connection elements are preferred. This then also allows the removal without major damage. In the event that bonding is chosen as a bonding method, a removal of the adhesive after removal of the insert, a new insert can also be refitted.

Alternatively, the insert can also be produced by injection into the component.

Further advantageous embodiments are described by the following description of the figures and by the subclaims.

Brief description of the drawings

The invention will be explained in more detail on the basis of at least one embodiment with reference to the drawings. Show it:

1 a view of a component with an insert according to a first embodiment of the invention,

2 a view of the component according to 1 but still without insert,

3 a view of the deposit according to 1 .

4 a view of a component with an insert according to a second embodiment of the invention,

5 a sectional view of the component according to 4 , and

6 a view of the deposit according to 4 or 5 ,

Preferred embodiment of the invention

The 1 shows a component in a first embodiment 1 with a deposit 2 , The component 1 is as a bowl-shaped element 3 formed, which is approximately pyramidal or roof-like and is formed sloping downwards. For this purpose, the cup-shaped element may have four or five obliquely tapered side walls. At the top 4 a connection or sealing flange is provided, by means of which the component 1 For example, as a collection box or diffuser connected to a tube sheet of a heat exchanger and can be attached.

These are in the circumferential connection or sealing flange connecting openings 5 provided by means of which the component 1 can be connected to a further element, for example a heat exchanger, and / or pressed on.

Furthermore, it can be seen that the component has a connection piece 6 has, which is tubular and a media passage 7 having. This media tour 7 provides a fluid connection between the opening 8th of the connecting piece 6 and the interior nine of the component there.

2 shows the component without the inserted insert. It can be seen that both the sealing flange 4 as well as at the end of the connecting piece 6 Recesses or depressions 10 . 11 are provided, which serve as connecting elements connecting elements of the insert 12 . 13 take.

The connecting elements 12 . 13 the deposit are in 3 clearly visible. There are at the four corners of the upper circumferential edge 13 the deposit 2 five protruding tongues 12 arranged, wherein at three of the four corners of the peripheral edge in each case a tongue 12 is provided and at a fourth corner of the peripheral edge adjacent to the corner in each case a tongue is provided, so that a total of five tongues are formed in the projections 10 of the flange of the component 1 intervene when the deposit 2 into the component 1 is inserted.

At the area 14 the deposit 2 that in the connecting piece 6 are introduced, are circumferential projections or cams 13 provided spaced around the circumference of the area 14 are arranged. When viewed in cross section, these cams would 13 be arranged distributed in a star shape.

These cams 13 engage in the recess when inserting the insert into the component 11 of the connecting piece 6 and form there a positive connection between the end portion of the connecting piece 6 and the end area of the area 14 the deposit.

Overall, in the 1 to 3 to recognize that a cup-shaped element, such as a collection box or diffuser of a heat exchanger, with an insert 2 is providable, so that all surface areas in the interior of the component 1 that could come into contact with a medium through the insert 2 are covered.

The 3 shows the deposit 2 without the component 1 , where the deposit 2 may be formed of an elastic material such as silicone or of a resilient plastic material, so that this insert 2 into the component 1 can be used. In this case, the tongues or projections 12 . 13 in the provided recesses 10 . 11 used or buttoned to a positive connection of the two parts 1 . 2 allow, so that in operation the component 1 with the insert 2 is positively connected, that no significant relative movements occur, so that the component is permanently durable.

The 4 . 5 and 6 show a further embodiment of the invention, wherein the 4 the component 21 with the insert 22 in a perspective view shows. The 5 shows a section through the component 21 with the insert 22 and the 6 shows the deposit 22 without the component 21 ,

Unlike the 1 to 3 shows the variant of 4 to 6 a deposit 22 at the top 23 has no tongues. In contrast, the top edge of the insert points 22 a flange-like edge on the openings 24 that has the openings 25 in the component 21 aligned so that the edge area 23 the deposit 22 with the sealing flange 26 of the component 21 is substantially the same design and this covers and optionally also advantageous as a seal between the flange 26 of the component 21 and a further component to be attached thereto is arranged.

The pipe socket 27 of the component 21 has at its front end no recesses for receiving retaining elements of the insert 22 on. The deposit 22 has the form-fitting connection in the region of the pipe socket, however, an annular bead 28 on when connecting the component 21 with the insert 22 from the pipe socket 27 protrudes forward and so creates a positive connection due to the increased diameter relative to the diameter of the opening of the pipe socket, which prevents the element 28 back into the pipe socket 27 can withdraw.

LIST OF REFERENCE NUMBERS

1

component

2

inlay

3

cup-shaped element

4

upper edge

5

connecting opening

6

spigot

7

Media through

8th

opening

9

inner space

10

deepening

11

deepening

12

inlay

13

inlay

14

Area

21

component

22

inlay

23

edge

24

opening

25

opening

26

sealing flange

27

pipe socket

28

bead

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 2613588 [0004, 0004]

Claims (12)

A component, in particular a heat exchanger, having a surface defining a region in which aggressive media are receivable, preferably with a shell-like element, characterized in that on the surface of the component or the shell-like element a liner is arranged, which has more corrosion-resistant properties as the shell-like element. Component according to claim 1, characterized in that the shell-like element has a circumferential sealing surface. Component according to claim 1 or 2, characterized in that the shell-like element has a tubular connecting piece, through which a medium can be flowed through. Component according to one of the preceding claims, characterized in that the insert completely covers the surface, preferably the inner surface of the component, so that a medium received in the component does not touch the surface of the component, but comes into contact with the surface of the insert. Component according to claim 1 to 4, characterized in that the insert is adapted to the contour of the surface of the component and this substantially completely covers and / or touched. Component according to one of claims 1 to 5, characterized in that the insert is adapted to the contour of the surface of the component such that in the presence of a connecting piece, the insert also has a connecting piece, which is inserted into the connecting piece of the component and covers it. Component according to one of the preceding claims, characterized in that the component and the insert are connected to each other, in particular by positive connection elements or by cohesive bonding. Component according to claim 7, characterized in that the component and the insert each have connecting elements for a positive connection, so that the component and the insert are connected to each other by the interaction of these connecting elements. Component according to one of the preceding claims, characterized in that projections or cams and receiving elements for such projections or cams are provided as connecting elements. Component according to claim 7, characterized in that the component and the insert are connected to one another by gluing. Component according to one of the preceding claims, characterized in that the insert is removable again inserted into the component. Component according to one of the preceding claims, characterized in that the insert can be injected into the component.

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