EP2295916B1 - Stacked plate cooler, use of same and combustion engine with a stacked plate cooler - Google Patents

Description

The invention relates to a stacked-plate radiator according to the preamble of claim 1. Furthermore, the invention relates to a use of the stacked-plate radiator as an oil cooler. The invention also relates to an internal combustion engine with a stacked-plate radiator.

Stacking disc cooler of the type mentioned are, for example, as an oil cooler EP 0 623 798 A2 known. In such designs, the lowermost of the trough-shaped plates forms the weakest link in terms of strength. Oil coolers of this type are generally attached to the base plate, for example, directly to an engine block of an internal combustion engine and are therefore subjected to relatively high lateral acceleration forces during operation of the engine. In particular, the lowest of the number of trough-shaped plates is at risk of deforming during operation, so that in the worst case, the operation of the cooler is in question. It is therefore desirable that stability a stacked disk cooler, in particular in the lower area, and to ensure a secure operation.

In DE 197 112 58 C2 The Applicant is to a stacked disc oil cooler described which provides between the base plate and the bottom plate a reinforcing plate, which is provided with a border of the bottom plate enclosing board.

This solution has proved to be particularly safe, but can still be improved. A stacked disk cooler according to the preamble of claim 1 is made DE 10 2007 030563 A1 known. The object of the invention is to provide a stacked-disk cooler, which is comparatively easy to manufacture and yet has sufficient stability. In particular, a stacked-disk cooler in the region of the lowermost plate and the base plate should be comparatively simplified to produce and still have sufficient stability. Next, an advantageous use of the stacked-disk cooler and an advantageous internal combustion engine with a stacking disk cooler to be specified.

With regard to the stacked-disk cooler, the object is achieved by the invention with a stacked-disk cooler of the type mentioned, in which according to the invention the features of the characterizing part of claim 1 are provided.

The invention is based on the consideration that a trough-shaped plate of the stacked-disk ice, in terms of both internal and external loads on the cooler, is comparatively vulnerable in the transition region to its upstanding edge. Due to the interleaved, spaced stacked plates of the stacking disk cooler, the majority of the plates support each other. The invention has recognized that the above-mentioned problem occurs, in particular in the region of the lowest plate, at the transition to the base plate, since an underlying trough-shaped plate - as in the upper region of the slice disc cooler - is missing. On the other hand, the invention has recognized that a reinforcing plate as in the prior art - can be saved in principle, if the base plate is carried out as such in an improved manner. Accordingly, the concept of the invention provides that a lowermost of the number of well-shaped plates is fixed directly on the base plate. This saves a reinforcement plate - this simplifies both the manufacturing process and the cost of the manufacturing process, as well as the cost of the stacked-plate cooler. The base plate formed according to the concept of the invention has a recess in the base plate main plane, wherein the lowermost plate is inserted in the recess and joined by means of a joint connection. The invention has recognized that a base plate has sufficient strength to be additionally provided with a depression can, without affecting the function of the base plate. Surprisingly, the invention thus utilizes the function of the base plate in a synergetic manner as a support of the stacking disk cooler and also as a support of the lowermost plate, in particular in the region of the upstanding edge.

As such, the stacked plate cooler is designed for heat exchange between a first fluid and a second fluid. In an advantageous Öikühler the first fluid to be cooled is an oil, preferably an engine oil of an internal combustion engine or the like. The second cooling fluid is advantageously a coolant, such as water or the like. The core of the heat exchanger is formed by the number of trough-shaped plates for the separate and heat exchanging guidance of the first and second fluids, wherein a number of flow channels through which the first and second fluids flow are formed by the adjacent hollow chambers of the spaced-apart and joined plates. The core of the heat exchanger can be arranged in a housing. In this form, a heat exchanger block of the stacked-plate cooler is advantageously provided with connections for the first fluid and the second fluid for guiding the same, advantageously in alternating sequence of adjacent flow channels.

Further advantageous developments of the invention can be found in the subclaims and specify in detail advantageous possibilities to realize the above-described concept within the scope of the problem as well as with regard to further advantages.

The bottom plate of the number of trough-shaped plates has a bottom with a designed according to need bottom contour The bottom contour is essentially the outer boundary of the plate. Accordingly, it has proved to be advantageous that the bottom contour corresponds exactly to a contour of the recess in the base plate. The plate is thus already held by the recess edges already fit. The bottom plate has a bottom, which - in cross section - merges in a radius of curvature in the upstanding edge. It has been found that there is a gap in the region of the radius of curvature between an outer edge of the lowermost plate and a recessed surface of the recess of the base plate when the lowermost plate is inserted into the recess. The concept envisages using a joint connection for fastening the lowermost plate in this position in order to stabilize the lowermost plate, in the region of the radius of curvature and up to the region of the raised edge. By doing. the intermediate space is filled with a joining agent of the joint connection. It has been shown that this - in supervision - in a radius range the bottom contour makes sense. Provided with advantage is a joint connection arranged in the radius range.

In a further preferred manner, it is provided that a joining means of the joint connection projects beyond the base plate main plane in a joining maleiscus. As a result, an increased stability of the lowermost plate can be continued, even surprisingly, even into the upstanding edge region. Overall, the concept of the invention can be realized in a particularly advantageous manner together with the further forming joint connection.

Preferably, the joint connection is formed in the form of a solder joint. In principle, however, other joint connections, such as a welded joint or the like, can be used. A solder joint has the advantage that it can be formed together with the other solder joints of the stacking disk cooler. A joining connection in the form of an adhesive bond has proven to be particularly advantageous. This can be realized very easily.

The recess of the base plate main plane is advantageously embossed in the base plate. An impression in the base plate can be comparatively simple and yet represent needs and versatile. In principle, however, other production methods for the depression, e.g. a milling method or other ablative methods for forming the recess.

Provided with advantage is a plate, in particular the bottom plate, if necessary. Also provided the base plate in the region of the bottom with a bottom profile. The profile can advantageously support the heat exchange or a heat dissipation from an adjacent cavity or flow channel of the radiator. The profile can also perform hold functions. There may also be provided a number of turbulence-generating elements. For heat exchanging flow guidance of the first and / or second fluid are, for example, soil profiles in wave or rib shape or a suitable corrugated pattern, such as the zig-zag shape. These can influence the flow guidance in order to increase the heat transfer by convection or turbulence or the like. This also applies to the bottom plate and the recess in the base plate.

Following the concept of the invention, a particularly preferred embodiment provides that the base plate is flat. In particular, the base plate may advantageously be rimless. This results in an advantageous material saving and a cost reduction.

The invention leads to the solution of the problem in an advantageous manner to a use of the stacked disk cooler as oil cooler. As an oil cooler, the stacking disk cooler is particularly suitable for cooling engine oil and / or gear oil. As a motor oil cooler, the stacking disk cooler is mounted in a particularly advantageous manner directly on an engine block of an internal combustion engine. Accordingly, the concept of the invention for solving the problem also leads to an internal combustion engine with a stacked disk cooler. The stacking disk cooler is advantageously attached to the base plate directly on the engine block, for example via a screw or other suitable connection.

Embodiments of the invention will now be described below with reference to the drawing. This is not necessarily to scale the embodiments, but the drawing, where appropriate for explanation, executed in a schematized and / or slightly distorted form. With regard to additions to the teachings directly recognizable from the drawing reference is made to the relevant prior art. It should be noted that various modifications and changes concerning the form and detail of an embodiment can be made without departing from the general idea of the invention. The disclosed in the description, in the drawing and in the claims features of the invention may be essential both individually and in any combination for the development of the invention. In addition, all combinations of at least two of the features disclosed in the description, the drawings and / or the claims fall within the scope of the invention. The general idea of the invention is not limited to the exact form or detail of the preferred embodiment shown and described below or limited to an article which would be limited in comparison to the subject matter claimed in the claims. For the given design ranges, values within the stated limits should also be disclosed as limit values and be arbitrarily usable and claimable. For simplicity, the same reference numerals are used below for identical or similar parts or parts with identical or similar function.

Fig. 1:

eine schematische Ansicht eines Stapelscheiben-Ölkühlers zur Erläuterung des grundsätzliche Aufbaus;

Fig. 2:

eine seitliche Schnittansicht einer bevorzugten Grundplatte, wie sie bei einem Stapelscheiben-Ölkühler der Fig. 1 zur Realisierung einer bevorzugten Ausführungsform gemäß dem Konzept der Erfindung eingesetzt werden kann - in Ansicht (B) ist die Grundplatte als Draufsicht gezeigt;

Fig. 3:

eine vergrößerte, schematische Darstellung des Details D der Fig. 2 (A);

Fig. 4:

eine in Fig. 2 (B) gezeigte Ausführungsform einer Grundplatte mit einer eingesetzten untersten Platte, wie sie bei einem Stapelscheiben-Ölkühler der Fig. 1 zur Realisierung einer Ausführungsform gemäß dem Konzept der Erfindung eingesetzt werden kann;

Fig. 5

eine Explosionsdarstellung eines bevorzugten Kerns einer bevorzugten Ausführungsform eines Stapelscheiben-Kühlers gemäß dem Konzept der Erfindung.

Further advantages, features and details of the invention will become apparent from the following description of the preferred embodiments and from the drawing; this shows in:

Fig. 1:

a schematic view of a stacked disc oil cooler to explain the basic structure;

Fig. 2:

a side sectional view of a preferred base plate, as in a stacked disc oil cooler of Fig. 1 to implement a preferred embodiment according to the concept of the invention can be used - in view (B), the base plate is shown as a plan view;

3:

an enlarged, schematic representation of the detail D of Fig. 2 (A) ;

4:

one in Fig. 2 (B) shown embodiment of a base plate with an inserted bottom plate, as in a stacked disc oil cooler of Fig. 1 can be used to implement an embodiment according to the concept of the invention;

Fig. 5

an exploded view of a preferred core of a preferred embodiment of a stacked-disk cooler according to the concept of the invention.

Fig. 1 FIG. 12 shows a stacked disc oil cooler 10 'having a block 1, the core of which is constructed of spaced-apart, trough-shaped plates 2 whose edges 2a overlap and are soldered together, and wherein the core is housed in a housing 3 of the block 1 of the stacked-plate oil cooler 10 'is arranged. For details regarding the basic structure of the stacked disc oil cooler 10 'is also on DE 19 711 258 C2 the applicant, the disclosure of which is incorporated by reference herein in the disclosure of the present application. Between two respective adjacent plates 2 hollow chambers 4 are formed in this way, which are alternately of the involved in the heat transfer media - namely a first fluid to be cooled 5.1 in the form of a motor oil and a second cooling fluid 5.2 in the form of cooling water - flows through. Thus, according to the flow directions indicated by arrows, the first fluid 5.1 in the form of the engine oil to be cooled enters through an inlet connection 6 into the stacked-disk oil cooler 10 'and out again through an outlet connection 7. The second fluid 5.2 - in the present case an engine coolant in the form of cooling water - passes through a hole in the engine block, not shown in detail Fig. 2B shown openings 8, 9 in the stacking disc oil cooler 10 'on and off. In an application-related In an appropriate manner, in order to realize a heat transfer between the engine oil and the cooling water, respectively adjacent hollow chambers 4 are flowed through by engine oil or cooling water. In this case, in a known manner, all chambers through which a first fluid 5.1 flows are separated from the inlet of the second fluid 5.2, so that a separate and heat-exchanging guidance of the first and second fluids 5.1 and 5.2 is realized in block 1.

The base plate 20 'of Fig. 1 has a peripheral edge 21 to the retaining ring of the block 1 and to the side protruding tab portions 22 for receiving connecting means not shown for attachment to the engine block of an internal combustion engine, not shown.

Fig. 2A shows a executed according to the concept of the invention base plate 20 on which the block 1 can be placed. The base plate 20 is in Fig. 2A in a side cross-sectional view in a modified form as a flat base plate without edge and tab. In the in Fig. 2A illustrated embodiment according to the concept of the invention, the base plate 20 in the Grundplatfenhauptebene 23 a recess 24 which in Fig. 2B can be seen in plan view of the base plate 20. The lowermost plate 12 of the Stapeischeiben oil cooler 10 can be used in this embodiment according to the concept of the invention in the recess 24 and - as out Fig. 3 with the enlarged detail D of the Fig. 2A visible - be joined with a joint connection F.

To use a in Fig. 2 Trough-shaped plate 12 shown in more detail, this has a bottom 13 with a bottom contour 14, which corresponds exactly to a contour 25 of the recess 24. For this purpose, the recess 24 is embossed in the base plate main plane 23 in the base plate 20.

The base plate 20 is provided in its, surrounding the recess 24, edge region 26 at mounting points with holes 28 through which screw can be introduced to mount the base plate 20, for example on an engine block of an internal combustion engine. In addition, a material recess 27 is provided in the region of the recess 24. The material recess 27 has the advantage that, during the embossing process, excess material volume can escape into the material recess. As a result, the accuracy of fit of the contour 25 is ensured.

Fig. 3 shows the detail D at a base plate 20 with a respect to the base plate main plane 23 lowered recess 24. In the recess 24, the lowermost trough-shaped plate 12 is inserted and joined by means of a joint connection F. The bottom plate 12 has a bottom 13 with a recognizable in plan view bottom contour 14. The bottom contour 14 - which in Fig. 3 is shown by way of example - is determined in plan view essentially by a surrounding the bottom 13 course of the radius of curvature 16 between the bottom 13 and the upstanding edge 15 of the trough-shaped plate 12. In the region of the radius of curvature 16, a gap filled by the joint F between an outer edge 17 of the lowermost plate 12 and a recess surface 18 is realized. As a result, stabilization of the lowermost trough-shaped plate 12 is achieved in the region of the radius of curvature 16 by forming the joint maleiscus 19 above the base plate main plane 23, also in the region of the upstanding edge 15. The stabilization is directed in particular against attacking transverse forces Q1, which can be generated by an internal pressure of the first fluid 5.1 or second fluid 5.2 and / or against transverse forces Q2, which may arise from transverse acceleration in vibrations of the stacked disc oil cooler 10 on an engine block.

Fig. 4 shows an arrangement of Fig. 3 In plan view, consisting of the base plate 20 and an inserted lowest trough-shaped plate 12. It can be seen from above the precisely matched alignment of the bottom contour 14 of the bottom plate 12 with respect to the contour 25 of the recess 24. The bottom contour 14 of the bottom plate 12 in the present case has a radius region 11, in which the stabilization through the joint F is particularly effective. In a very simple embodiment, not shown here, the joint connection can if necessary be limited to the radius range 11.

The lowest trough-shaped plate 12 is presently provided on its bottom with a bottom profiling 31, which serves to conduct in a hollow chamber 4 fluid 5.1 or - depending on use - 5.2 to perform so that a heat exchange is optimized. The bottom profiling 31 can also be supplemented, for example, by turbulence-generating elements in a hollow chamber 4. In addition, openings 36, 37, 38, 39 of the lowermost trough-shaped plate 12 can be seen with the openings 6, 7, 8, 9 of the bottom plate 20. These are flexibly attachable as needed and still allow a passage of a fluid 5.1, 5.2 through the base plate in a hollow chamber. 4

Fig. 5 shows by way of example in an exploded view, the Kassetierung a core at a block 1 of the stacked-plate cooler 10 with base plate 20 according to a preferred embodiment. Here, identical or similar parts or parts identical or similar function for the sake of simplicity with the same reference numerals as in Fig. 1 Mistake. Basically, the structure of the stacked-plate cooler 10 corresponds to the structure of the stacked-plate cooler 10. In the present preferred embodiment of the stacked plate cooler 10, the base plate 20 is provided instead of the base plate 20 'according to the concept of the invention, so that the lowermost plate 12 is simple and yet safely stabilized is used.

Unlike the in Fig. 2B shown base plate 20 is present in the Fig. 5 shown base plate 20 provided with a number of three expansion joints 27 - this in turn to record by the embossing process for the recess 24 resulting excess volume of material.

The exploded view of the Fig. 5 shows that when Kassettenierung of the stacked-disk oil cooler 10, the lowest trough-shaped plate 12 can be inserted directly into the recess 24 of the base plate 20 and joined there; and together with the other trough-shaped plates 2 of the block 1 and a cover 40. The block 1 can (here without housing shown), if necessary, in a arranged between the cover 40 and the base plate 20 housing 3, as for example in Fig. 1 is presented.

In summary, the invention relates to a stacked-plate cooler 10, in particular oil cooler, for an internal combustion engine according to claim 1.

LIST OF REFERENCE NUMBERS

1

block

2

plates

2a

margins

3

casing

4

hollow chambers

5.1

first fluid

5.2

second fluid

6

Entry port, openings

7

Outlet, openings

8th

openings

9

openings

10 ', 10

Stacked-plate oil cooler

11

radius area

12

bottom pan-shaped plate

13

ground

14

ground contour

15

upstanding edge

16

radius of curvature

17

outer edge

18

well surface

19

Add meniscus

20 ', 20

baseplate

21

edge

22

Tab areas, tab

23

Baseplate main level

24

deepening

25

contour

26

border area

27

Material recess, expansion joints

28

drilling

31

bottom profiling

36

openings

37

openings

38

openings

39

openings

40

cover plate

D

detail

F

Retaining compound

Q1

transverse forces

Q2

transverse forces

Claims (12)

1. A stacked-plate cooler (10), in particular an oil cooler, for an internal combustion engine, having:

   a number of trough-shaped plates (2) with an upstanding edge (15), wherein the plates (2) are stacked with the edge (15) one inside the other and joined at a distance in order to form adjacent hollow chambers (4), and

   a base plate (20) with a base plate main plane (23), wherein a lowermost one of the number of trough-shaped plates (12) is attached to the base plate (20),

   and a lowermost one of the number of trough-shaped plates (12) is fastened directly to the base plate (20), wherein the base plate (20) has a recess (24) in the base plate main plane (23) and the lowermost plate (12) is inserted into the recess and is joined by means of a joint connection (F), characterised in that the lowermost plate (12) has a bottom (13) which merges into the upstanding edge (15) in a radius of curvature (16), and wherein a gap between an outer edge (17) of the lowermost plate (12) an a recess surface (18) is filled by a joining means of the joint connection (F) in the region of the radius of curvature (16).
2. The stacked-plate cooler (10) according to claim 1, characterised in that the lowermost plate (12) has a bottom (13) with a bottom contour (14) which accurately corresponds to a contour (25) of the recess (24).
3. A stacked-plate cooler (10) according to claim 1 or 2, characterised in that a joining means of the joint connection (F) projects beyond the base plate main plane (23) in a joining meniscus (19).
4. A stacked-plate cooler (10) according to one of claims 1 to 3, characterised in that a bottom contour (14) of a bottom (13) of the lowermost plate (12) has a radius region (11) and a joint connection (F), in particular a joining meniscus (19), is arranged in the radius region (11).
5. The stacked-plate cooler (10) according to one of claims 1 to 4, characterised in that the joint connection (F) is a soldered joint.
6. The stacked-plate cooler (10) according to one of claims 1 to 5, characterised in that the joint connection (F) is an adhesive joint.
7. The stacked-plate cooler (10) according to one of claims 1 to 6, characterised in that the recess (24) is stamped into the base plate (20).
8. The stacked-plate cooler (10) according to one of claims 1 to 7, characterised in that the recess (24) is milled into the base plate (20).
9. The stacked-plate cooler (10) according to one of claims 1 to 8, characterised in that a plate of the number of plates (2), in particular the lowermost plate (12), preferably all plates (2, 12), has a bottom (13) with a bottom profile (31), and/or a turbulence-generating element is arranged in a hollow chamber (4).
10. The stacked-plate cooler (10) according to one of claims 1 to 9, characterised in that the base plate (20) is flat, in particular is free from an edge.
11. Use of the stacked-plate cooler (10) according to one of claims 1 to 10 as an oil cooler, in particular for cooling engine oil and/or gear oil.
12. An internal combustion engine with a stacked-plate cooler (10) according to one of claims 1 to 10.

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