Patent Application
20190061271
This application claims priority to European Patent Application No. EP 17187667.5, filed on Aug. 24, 2017, the contents of which are hereby incorporated by reference in its entirety.
The present invention relates to a heat exchanger comprising a first component and a second component, wherein the first component and the second component each have an edge zone and wherein the first and the second component abut against one another in an overlapping manner at their edge zones. The invention further relates to a method for producing a heat exchanger.
Heat exchangers are used, for example, in motor vehicles and generally comprise inter alia as a first component a heat exchanger block which is substantially formed by tubes, fins or lamellae as well as end plates, and as a second component, a collecting and/or distributor box or a deflecting box. Usually the heat exchanger block and the collecting and/or distributor box or deflecting box are mechanically connected to one another by means of a clamping connection or flange connection and a rubber seal can be provided for sealing between heat exchanger block and collecting and/or distributor box or deflecting box. Typically the heat exchanger block consists of a metal material such as, for example, an aluminium material and the collecting and/or distributor box or deflecting box consists of plastic.
Known from DE 10 2012 202 886 is a heat exchanger in which a heat exchanger block with its end plate as a first component is mechanically connected to a collecting box as a second component. The end plate here has an upright edge zone which embraces a flange of the collecting box. The edge of the edge zone is bent over the flange of the collecting box together with subregions of the edge zone adjoining the edge so that a clamping and flange connection is formed.
Known from GB 2 138 335 is a heat exchanger in which a heat exchanger block as first component is mechanically connected to a collecting box as second component. The heat exchanger block here has an upright edge zone which comprises a plurality of uniformly arranged recesses spaced apart from the edge of the edge zone and which embraces a flange of the collecting box. The edge of the edge zone is in each case bent or pressed over the flange of the collecting box in some regions together with the subregions of the edge zone adjoining the edge so that a clamping or flange connection is formed.
EP 0 128 806 discloses a heat exchanger in which a heat exchanger block as a first component is mechanically connected to a collecting box as a second component. The heat exchanger block here has an upright edge zone comprising a plurality of projections or lugs arranged uniformly on the edge of the edge zone and projecting from the edge, and which embraces a flange of the collecting box. The projections or lugs projecting from the edge of the edge zone are bent or pressed over the flange of the collecting box so that a clamping or flange connection is formed.
Known from U.S. Pat. No. 4,649,628 is a heat exchanger in which a heat exchanger block as first component is mechanically connected to a collecting box as second component. The heat exchanger block here has an upright edge zone which comprises a plurality of recesses arranged uniformly and spaced apart from the edge zone, and which embraces a flange of the collecting box. The edge of the edge zone is bent over the flange of the collecting box together with subregions of the edge zone adjoining the edge so that a clamping and flange connection is formed.
In these known heat exchangers however, the space requirement in the installation space provided in the motor vehicle is very large since these known heat exchangers have large dimensions not least because of the clamping or flange connection. As a result of the continually increasing number of units in motor vehicles, the space available for a heat exchangers is however further limited whilst at the same time a high heat exchanger capacity is required which in turn necessitates large heat exchangers. As a result of the usual construction of a heat exchanger with a clamping or flange connection however, the compactness of the known heat exchanger is limited. In addition, the clamping or flange connection in the known heat exchangers is not robust and the material consumption is high.
Known from U.S. Pat. No. 7,469,741 is a heat exchanger made of a non-metallic material in which the individual components are joined to one another by welding by means of a laser beam. The heat exchanger block as well as the collecting and/or distributor box or deflecting box which consist of the same non-metallic material are joined to one another by welding by means of a laser beam. A clamping or flange connection is not necessary here.
If the collecting and/or distributor boxes or deflecting box as well as the heat exchanger block are formed from different materials (in the known heat exchangers mentioned, the heat exchanger block usually consists of a metal material such as for example an aluminium material and the collecting and/or distributor boxes or deflecting box usually consist of a plastic), the heat exchanger block and the collecting and/or distributor box or deflecting box are joined to one another by means of screws and not welded together. However, this considerably increases the space requirement for such a heat exchanger since the screws required here increase the external dimensions of the heat exchanger even beyond the dimensions of a heat exchanger formed with the usual clamping or flange connection. Furthermore, the screws increase the weight of the heat exchanger and the necessary material consumption. In addition, a seal is also required with this screw connection and there is the risk that this mechanical clamping connection between heat exchanger block and collecting and/or distributor boxes or deflecting box becomes leaky. The small surface contact zones resulting from the screw connections between the plastic of the heat exchanger block and the metal material of the collecting and/or distributor boxes or deflecting box can cause plastic deformation which result in a reduced sealing pressure.
However, heat exchangers are generally subjected to an alternating loading as a result of an alternating internal pressure and an alternating temperature loading so that under longer and higher stressing there is a risk that the heat exchanger will become leaky due to the reduced sealing pressure.
Against this background, it is therefore the object of the present invention to provide a heat exchanger and a method for producing a heat exchanger which avoids the afore-mentioned disadvantages.
This object is solved according to the invention by the subject matter of the independent claim(s). Advantageous embodiments are the subject matter of the dependent claim(s).
The present invention is based on the general idea of providing a heat exchanger without a clamping or flange connection in which a component made of a first material and a component made of a second material abut against one another in an overlapping manner in their edge zone and are joined to one another, characterized in that at least the edge zone of the first component consists of a material which is impermeable to laser beams and that the edge zone of the first component externally overlaps the edge zone of the second component and abuts against this in direct contact and is thus joined by a fusion bond.
Thus, a compact heat exchanger with small dimensions and reduced material required can be provided. The edge zone of the first component which externally overlaps the edge zone of the second component and abuts against this in direct contact can be joined to the edge zone of the second component by a fusion bond so that a secure, reliable, load-bearing and tight connection is provided between first component and second component. A clamping or flange connection between first component and second component with the construction-dependent high material requirement and space requirement as well as a required sealing is thus avoided. The connection between first component and second component is secure, reliable and tight even under longer and higher stressing of the heat exchanger so that the reliability and lifetime of the heat exchanger according to the invention is significantly increased. In particular, a compact heat exchanger in relation to capacity is therefore provided which can be adapted to the reduced installation space in modern motor vehicles.
According to a particularly advantageous embodiment, the edge zone of the second component can be plasticized to produce the fusion bond by means of a laser beam so that the edge zone of the second component is joined to an inner side of the edge zone of the first component which points towards the edge zone of the second component. According to the invention, the edge zone of the first component is heated by means of a laser beam with the result that the edge zone of the second component against which the edge zone of the first component abuts in direct contact is heated. Since the edge zone of the first component according to the invention consists at least in some regions of a material which is impermeable to laser beams, this heating by means of a laser beam and therefore the joining of the two component due to a fusion bond is possible by means of a laser beam. The laser beam does not pass through the material which is impermeable to laser beams, instead the material absorbs the energy of the laser beam and is heated as a result. This heating of the two different materials which abut against one another in direct contact brings about a secure, reliable and in particular tight joining of these two materials to one another.
A further advantageous embodiment provides that the laser beam acts on an outer side of the edge zone of the first component which points away from the edge zone of the second component. Thus, in a simple manner according to the invention, a laser beam can act on the edge zone of the first component and join the two components together in the manner described. The laser beam can in this case act on the entire edge zone of the first component or it can act on one or several subregions of the edge zone. It is also possible that a plurality of laser beams act on the entire edge zone of the first component or on one or more subregions of the edge zone. The laser beam or beams can in this case act at right angles to the edge zone or at an angle which differs from a right angle. It is also possible that during the action of a plurality of laser beam, these each act at different angles and/or act on different subregions, simultaneously or successively.
According to a further preferred embodiment, the edge zone of the second component has projections or lugs which embrace the edge zone of the first component at least in some regions. These projections or lugs act inter alia as guides so that on the one hand it is ensured according to the invention that the components come into the correct position with respect to one another when joining together and that on the other hand the edge zones of the first and second component abut against one another in direct contact so that the joining of the two components together according to the invention is made possible. Advantageously it can be provided here that the projections or lugs are continuations of reinforcing fins provided on the second component. This is particularly advantageous if the second component is subject to a high and possibly alternating internal pressure since an extension or inflation of the second component is then prevented.
Various design possibilities for the projections or lugs are feasible as long as it is ensured that in the mounted state they embrace the edge zone of the first component at least in sections.
The remaining parameters for the configuration of the projections or lugs can be adapted to the respective application. Here inter alia the number of projections or lugs, the spacing of the projections or lugs to one another, the width of the projections or lugs etc., are mentioned as relevant parameters.
A further preferred embodiment provides that the edge zone of the second component has at least one stop against which the edge zone of the first component abuts with one edge at least partially. By this means it is facilitated according to the invention that the first component and the second component lie with respect to one another in the correct position so that the edge zone of the first and second component are joined to one another in the provided position. This contributes according to the invention to a secure, load-bearing and tight connection between the first component and second component even under fairly long and higher stressing of the heat exchanger so that the reliability and lifetime of the heat exchanger according to the invention is significantly increased.
This is particularly advantageous if, as is provided according to a further preferred embodiment, the first component is a metal component and in particular a heat exchanger block made of aluminium. As a result of the formation of a surface contact between first component and second component at the stop of the second component, substantially only a tensile or compressive loading will occur in this region and no bending loading. This is particularly advantageous for aluminium since aluminium can absorb tensile and compressive forces better than a bending load.
Finally, according to a further advantageous embodiment it is provided that the second component is a non-metallic component, in particular a collecting and/or distributor or deflecting box.
As a result of this advantageous configuration according to the invention, in which an edge zone made of aluminium abuts against an edge zone made of plastic in direct contact, the plastic is joined to the aluminium side which points towards the plastic when a laser beam acts on the other aluminium side which points away from the plastic.
Further important features and advantages of the invention are obtained from the subclaims, from the drawings and from the relevant description of the figures with reference to the drawings.
It is understood that the features mentioned previously and to be explained further hereinafter can be used not only in the respectively given combination but also in other combinations or alone without departing from the scope of the present invention.
Preferred exemplary embodiments of the invention are presented in the drawings and are explained in detail in the following description, where the same reference numbers relate to the same or similar or functionally the same components.
In the figures, in each case schematically
The heat exchanger block 20 has an upright edge zone 22 which is delimited by an edge 24. On the side pointing towards the edge zone 22 or the edge 24, fins 26 are arranged in a known manner, of which one is shown here.
As can be clearly seen here, the edge zone 22 abuts externally against an edge zone 62 of the collecting box 60 in direct contact in an overlapping manner. The edge zone 22 has on its outer side in each case a plurality of projections or lugs 64 which embrace the edge zone 22 of the first component 20. In each case, a stop 66 is formed on the inner side of the projections 64, against which the edge zone 22 abuts with its edge 24. It can also be clearly seen here that the projections or lugs 64 are continuations of reinforcing fins 68 arranged on the collecting box 60. This is advantageous since the collecting box 60 is exposed to a high and alternating internal pressure and these reinforcing fins 68 prevent an expansion or inflation of the collecting box 60.
The projections or lugs 64 act inter alia as guides so that on the one hand, it is ensured according to the invention that the heat exchanger block 20 and the collecting box 60 come into the correct position with respect to one another when joining together and that on the other hand, the edge zones 22, 62 of the heat exchanger block 20 and the collecting box 60 abut against one another in direct contact so that it is possible to join the two components together according to the invention.
This contributes according to the invention to a secure, load-bearing and tight connection between heat exchanger block 20 and collecting box 60 even under fairly long and higher stressing of the heat exchanger 10, so that the reliability and lifetime of the heat exchanger 10 according to the invention is significantly increased.
As indicated by the arrows 40 here in
The same components are here provided with the same reference numbers so that a renewed description of these components can be dispensed with.
Also here in the embodiment shown in
The advantage of this embodiment consists in that the edge zone 62 of the collecting box 60 is connected sealingly on both sides to the inner side 28 of the edge zone 22 of the heat exchanger block 20. As indicated by the arrow 40, a laser beam 40 can as a result act on different regions of the outer side 30 of the edge zone 22 in each case: a laser beam 40 can act on the subregion of the outer side 30 of the edge zone 22 which lies opposite the outer side of the edge zone 62 of the collecting chamber 60 and a laser beam 40 can act on the subregion of the outer side 30 of the edge zone 22 which lies opposite the inner side of the edge zone 62 of the collecting chamber 60. By this means, a particularly secure and reliable and in particular double-sealing connection between the plastic of the edge zone 62 of the collecting chamber 60 and the aluminium of the edge zone 22 of the heat exchanger block 20 can be provided.
As a result of this configuration according to the invention, the laser beams 40 can act on subregions of the outer side 30 of the edge zone 22 which lie opposite both the outer side and also the inner side of the edge zone 62 of the collecting box 60 and therefore heat this region of the edge zone 22 in the manner already described. Thus however, both the outer side and the inner side of the edge zone 62 of the collecting chamber 60 which abut against the heated regions of the edge zone 22 in direct contact are heated so that a reliable, secure and in particular tight connection is achieved between the plastic of the edge zone 62 of the collecting box 60 and the aluminium of the edge zone 22 of the heat exchanger block 20 in the regions heated by the laser beams 40.
The same components are here provided with the same reference numbers so that a renewed description of these components can be dispensed with.
In this isometric view through the collecting box 60 and the heat exchanger block 20 of this third embodiment, it can be clearly seen that the edge zone 22 of the heat exchanger block 20 and the edge zone 62 of the collecting box 60 abut against one another in direct contact in an overlapping manner. In addition, the edge zone 22 of the heat exchanger block 20 is bent around the edge zone 62 of the collecting box 60 in such a manner that both the outer side of the edge zone 62 and also an edge 70 of the edge zone 62 abut sealingly against the inner side 28 of the edge zone 22.
The advantage of this embodiment is that the edge zone 62 of the collecting box 60 is joined sealingly both with its outer side and also with its edge 70 to the inner side 28 of the edge zone 22 of the heat exchanger block 20. As indicated by the arrows 40, a laser beam 40 can thus act in each case on different regions of the outer side 30 of the edge zone 22: a laser beam 40 can act on the subregion of the outer side 30 of the edge zone 22 which lies opposite the outer side of the edge zone 62 of the collecting chamber 60 and a laser beam 40 can act in
An advantage of this embodiment consists in that laser beams 40 can act on different laser regions A, B on the outer side 30 of the edge zone 22 of the heat exchanger block 20 in order, for example, to achieve a triple join or seal between the edge zone 62 of the collecting box 60 and the edge zone 22 of the heat exchanger block 20.
As already described, a laser beam 40 can act from below in
Furthermore, a laser beam 40 can act on a laser region B on the outer side 30 of the edge zone 22 which lies opposite the outer side of the edge zone 62 of the collecting box 60 and is formed continuously along the outer side 30 of the edge zone 22. By this means a secure and reliable and in particular sealing second connection is achieved between the outer side of the edge zone 62 and the inner side 28 of the edge zone 22 in the manner described according to the invention.
Finally a laser beam 40 can act on a laser region A on the outer side 30 of the edge zone 22 which lies opposite the outer side of the edge zone 62 of the collecting box 60 and is formed intermittently along the outer side 30 of the edge zone 22 in each case between the projections or lugs 64. By this means a secure and reliable and in particular sealing third connection is achieved between the outer side of the edge zone 62 and the inner side 28 of the edge zone 22 in the manner described according to the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 17187667.5 | Aug 2017 | EP | regional |
