TECHNICAL FIELD
The invention relates to a heat exchanger, consisting of a plurality of layers arranged on top of each other, which layers have in each case a cavity for the passage of a medium to be cooled and delimit a further cavity for the passage of a coolant, wherein in each layer a through hole is formed for the passage of the medium to be cooled.
BACKGROUND
FIG. 1 illustrates a stacked plate heat exchanger which consists of different plates 2 which are arranged on top of each other and which have in each case one turbulence insert. The turbulence insert 3 is lasered and stamped and is adapted in this manner to the shape of the plate 2. The plates 2 mounted on top of each other are arranged on a base plate 4. At the end regions of each plate 2, there are through holes 5 which are used for guiding the medium to be cooled or for guiding the coolant. Above the plates 2, the stacked plate heat exchanger 1 is closed with a flange F which represents the interface to the internal combustion engine and to the coolant supply system. Here, the plates 2 are stamped or deep-drawn shaped parts. For producing such shaped parts, tools have to be prepared, wherein a plurality of tools is required for the different sizes of the plates 2. The multiplicity of tools increases the investment costs because the tools are not variable and for each plate size, a separate tool has to be prepared. Depending on the type of heat exchanger, up to four different tools for each plate size may be required. In particular in the case of prototype production in which likewise a tool for each new size has to be prepared, long production times for the tools are to be expected. Due to the small quantities of plates 2 for prototypes and small series, the investment in tools cannot be amortized.
SUMMARY
It is therefore an object of the invention to propose a heat exchanger which can be produced in a variable manner and for which the investment costs for tools, in particular, for prototypes or small series can be reduced.
According to the invention, this object is achieved in that a layer consists of a frame into which a turbulence insert is inserted. This has the advantage that the frame can be cut out in a simple manner from sheet metal by means of laser beams or water jets, wherein the path of the laser beams or the water jets is controlled by a computer. In particular in case of high quantities, stamping is also conceivable for producing the frame. Thus, any computer-controlled laser beam tool or water jet tool can be used with a special shape-generating computer program for the fabrication of the frame. Producing an expensive tool is completely eliminated so that investment costs are reduced or are completely eliminated. Such a computer program can be varied in a simple manner so that frames in many different sizes and quantities can be produced without a significant increase of costs. Furthermore, the development times for a heat exchanger are reduced. Since due to the invention, the heat exchangers can adopt any possible outer contour, optimal utilization of installation space or adaptation to existing installation space in the motor vehicle is possible.
Advantageously, the frame completely encloses the turbulence insert and has in particular an approximately rectangular shape. The turbulence insert is held in place by the frame, wherein the height of the frame is adapted to the height of the turbulence insert. The turbulence insert simply has to be stamped out of a larger piece. Cutting the turbulence insert for adapting it to the shape of the frame is eliminated so that the production costs for the heat exchanger are further reduced.
In one configuration, a separating arrangement is inserted between two layers, which layers each consist of the frame and the turbulence insert. This separating arrangement separates the flows of media of the medium to be cooled and the coolant. Since the separating arrangement can be produced in a simple manner from a film or thin sheet metal, this also results in a reduction of the production costs for the heat exchanger.
In one refinement, the separating arrangement that is formed in a plate-like has a solder layer on both sides. This solder layer ensures that during soldering the pre-assembled heat exchanger in a solder furnace, the frames and the turbulence inserts are firmly connected to each other via the separating arrangement, thereby achieving high stability of the heat exchanger.
In one variant, in each case one through hole for guiding the medium to be cooled and one channel closure are formed in an end region of the frame. Due to this configuration, the heat exchanger based on frames corresponds in terms of its geometry to a stacked plate heat exchanger so that the corresponding flanges which, after assembly of the heat exchanger, are attached as a closure onto the heat exchanger, can also be used for the heat exchanger implemented as frame-type construction. This eliminates the need of fabricating new flanges for the heat exchanger produced as a frame-type construction.
In order to ensure that the medium to be cooled is guided through the turbulence insert, the first through hole to the inlet of the medium to be cooled and the second through hole to the outlet of the medium to be cooled are formed in the frame so as to oppose each other diagonally or simply oppose each other.
Furthermore, for receiving an assembly aid, the frame has a guide opening. This guide opening ensures that the frames arranged on top of each other match exactly so that the through holes to the inlet or, respectively, to the outlet of the medium to be cooled or the coolant are reliably positioned on top of each other.
In a particularly space-saving variant, the guide opening is formed between the through hole and the energy closure.
In one refinement, between two frames positioned in a first predetermined position to each other, in each case one further frame is mounted in a second predetermined position which is turned or rotated relative to the first position. Through this alternating positioning of the frames relative to each other, the cavities for the passage of a medium to be cooled and for the coolant are created so that the medium and the coolant are always conveyed alternately to each other, and the coolant can dissipate the heat of the medium to be cooled in a sufficient manner.
In one configuration, the frame has on its outer edge at least one marking pin. This marking pin has the advantage that after the assembly of the heat exchanger, said marking pin leaves a symmetrical pattern on the outside of the heat exchanger so that the person carrying out the stacking can immediately identify if the individual frames are in the correct position relative to each other.
The invention allows numerous embodiments. Some of them shall be illustrated in more detail by means of the figures illustrated in the drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
In the figures:
FIG. 1 shows a stacked plate heat exchanger according to the prior art,
FIG. 2 shows a frame of a heat exchanger,
FIG. 3 shows a separating plate of a heat exchanger,
FIG. 4 shows an exploded illustration for the arrangement of the frame according to FIG. 2 and the separating plate according to FIG. 3,
FIG. 5 shows a top view of a first positioning of the frame in the heat exchanger,
FIG. 6 shows a top view of a second positioning of the frame in the heat exchanger,
FIG. 7 shows a section through an oil heat exchanger,
FIG. 8 shows a section through an intercooler,
FIG. 9 shows a soldering device with the heat exchanger,
FIG. 10 shows a changeable soldering device,
FIG. 11 shows the manufacture of a frame from an extruded profile,
FIG. 12 shows possible designs of the heat exchanger.
Identical features are designated by identical reference numbers.
DETAILED DESCRIPTION
FIG. 2 shows a frame as it is cut out by a computer-controlled laser beam tool or water jet tool. Here, the frame 6 has an approximately rectangular shape and has in its longitudinal extension two rib-shaped longitudinal edges 7 and 8, while on the narrow side, the end regions 9 and 10 are widened. The end region 9 comprises an inlet 11 for a liquid medium, a channel closure 13 for a liquid medium, and a guide opening 14 for an assembly aid. Diagonally opposite to the channel closure 13 of the end region 9, there is also a channel closure 13 that is formed in the end region 10. Also, the outlet 12 for the liquid medium in the end region 10 is arranged diagonally opposite to the inlet 11 in the end region 9. Between the channel closure 13 and the inlet 11 of the end region 9 and the outlet 12 and the channel closure 13 in the end region 10, guide openings 14 are arranged so that they oppose each other symmetrically when forming the frame 6.
In FIG. 3, a separating arrangement is illustrated which is formed as a separating plate 15 and the outer contours of which are adapted to the outer contours of the frame 6. The separating plate 15 is formed planarly and has openings 16 and 17, respectively, at its narrow ends, which openings are formed approximately ovally and span over the channel closure 13 and, respectively, the inlet 11 or the outlet 12 of the frame 6. The opening 18 which is arranged in the centre and which is formed on both sides of the separating plate 15 is situated exactly under the guide opening 14.
FIG. 4 shows how the frame 6 illustrated in FIGS. 2 and 3 and the separating plate 15 are mounted on top of each other. Here, the frame 6 rests on the separating plate 15, wherein the inside of the frame 6 is filled with a turbulence insert 19. This turbulence insert 19 is simply inserted into the frame 6 and has only to be stamped for this reason. Cutting the turbulence insert 19 into a particular shape is eliminated. In addition to the already mentioned openings such as inlet 11 or outlet 12 or guide opening 14, and the channel closure 13, the frame 6 has a marking pin 20 on an end region 10. Moreover, the channel closure 13 is provided with a rib 21 which enables an exceptional stability of the frame 6. With said rib 21 it is ensured that the frame 6 cannot bulge in the end region 9, 10.
In FIG. 5, the separating plate 15 and the frame 6 are layered alternately one above the other and are positioned on a base plate 22. Here, the frame 6 does not include the turbulence inserts. In this top view, the position of a frame 6a is shown. The end region 9 of the frame 6a is positioned on the left side of the base plate 22 while the end region 10 of the frame 6a is arranged on the right side of the base plate 22. The inlet 11 of the end region 9 for a liquid medium is arranged diagonally opposite to the outlet 12 for the liquid medium in the end region 10 of the frame 6a. Here, the guide openings 14 are arranged opposite to each other. Also, the channel closure 13 of the end region 9 and the end region 10 are arranged diagonally opposite to each other in this positioning of the frame 6a.
In FIG. 6, a second position of a further frame 6b is shown which is positioned above the frame 6a illustrated in connection with FIG. 5. In comparison to the frame 6a of FIG. 5, the frame 6b is rotated about its longitudinal axis by 180°. This results in that the channel closure 13 of the end region 9 is now positioned at the position where the inlet 11 of the frame 6a placed therebelow is positioned. With regard to the end region 10, the channel closure 13 and the outlet 12 are also interchanged. In this position, the turbulence insert 19 is inserted in the frame 6b. Thus, the medium to be cooled can discharge from the inlet 11 and flows in the longitudinal direction of the frame 6b through the turbulence insert 19 so as to flow out again through the outlet 12 and out of the frame 6b.
FIG. 7 illustrates a completely fabricated oil heat exchanger in which a plurality of frames 6a, 6b are layered on top of each other, wherein the frames 6a, 6b are separated by a separating plate 15. The turbulence inserts 19 are only indicated in this example. The frames 6a, 6b are alternately mounted, separated by a separating plate 15, on the base plate 22 and are closed by a flange 23. Prior to the assembly, the separating plates 15 are coated on both sides with solder which effects that in a solder process, the frames 6a, 6b and the turbulence insert 19 are firmly connected to each other.
FIG. 8 illustrates an intercooler having the explained frame-type construction, wherein here too, the frames 6a, 6b are arranged alternately on a base plate 22, wherein the frames 6a, 6b are separated in each case by a separating plate 15. The different channels for the passage of air used as coolant or for the passage of the medium to be cooled are particularly clearly shown in this section. The arrow 24 indicates the profile on the air side, while the arrow 25 illustrates the profile on the coolant side. The intercooler is also covered with a flange 23.
In FIG. 9, a heat exchanger 27 built as frame-type construction is inserted in a soldering device 26. Here, the heat exchanger 27 is mounted on a first plate 28 which is guided by means of four guide bolts 32, wherein between the first plate 28 and a second plate 29, a plurality of springs 30 is arranged. In order to be able to securely position the frames 6a, 6b and the separating plates 15, in each case one bolt 31a, 31b is inserted through the guide openings 14 of the heat exchanger 27. The cover plate 33 covers the heat exchanger 27. The cover plate 33 is set at the openings 34 of the guide bolts 32 in such a manner that the heat exchanger 27 is preloaded against the springs 30. As already explained, in the preassembled heat exchanger 27, the separating plates 15 are provided on both sides with a solder layer. The heat exchanger 27 clamped in such a manner in the soldering device 26 is slid into a solder furnace, where the heat exchanger with its individual parts is soldered together during a soldering process.
FIG. 10 illustrates a variable soldering device 26 which can be adjusted for different sizes of the heat exchangers 27. The bolts 31a, 31b which engage in the guide openings 14 of the frame 6 of the heat exchanger 27 can be adjusted vertically as well as horizontally. In addition, they are secured on a stacking aid 35 which can be removed again after clamping. Thus, a soldering device 26 can be used for each shape of the heat exchangers 27 fabricated as a frame-type construction.
As already explained, the frame 6 of the heat exchanger 27 is cut out or stamped by means of a laser beam or a water jet, wherein the tool is controlled by a computer program. Alternatively, the frames 6 can also be produced as extruded profiles 36, as illustrated in FIG. 11. The drawn extruded profile 36 generated in a single work process is subsequently divided to form the frames 6.
However, the invention is not limited to a heat exchanger having an approximately rectangular footprint. By means of the frame-type construction it is possible that all conceivable shapes of heat exchangers 37 can be formed, as illustrated in FIG. 12. In particular, by using a computer program which controls a laser beam tool or a water jet tool, annular contours as well as S-shaped or circular-segment-shaped shapes can be produced. Thus, the shape of the heat exchanger 37 can always be adapted to the installation position in the motor vehicle.
Patent Application
20130168048
