METHOD FOR PRODUCING A HEAT EXCHANGER

Abstract

A method for producing a heat exchanger may include adhesively bonding at least two components to one another and applying an adhesive layer to an outer side of at least one of the at least two components.

Claims

1. A method for producing a heat exchanger, comprising adhesively bonding at least two components to one another by applying an adhesive layer to an outer side of at least one component of the at least two components.

2. The method as claimed in claim 1, wherein the at least one component to be coated is structured as a narrow stock and the adhesive layer is an adhesive film, further including: heating the adhesive film; passing the adhesive film and the narrow stock through a plurality of pressure rollers after heating the adhesive film and pressing the adhesive film and the narrow stock against one another while being passed through the plurality of pressure rollers to form a coated narrow stock; and cooling and rolling up the coated narrow stock.

3. The method as claimed in claim 1, wherein the at least one component to be coated is structured as a tube and the adhesive layer is an adhesive film, further including: pressing the adhesive film and the tube against one another by a plurality of pressure rollers; and passing the adhesive film and the tube through a furnace and heating the adhesive film and the tube to shrink the adhesive film onto the tube.

4. The method as claimed in claim 2, further comprising heating at least one pressure roller of the plurality of pressure rollers prior to passing the adhesive film and the narrow stock through the plurality of pressure rollers.

5. The method as claimed in claim 3, wherein at least one of: pressing the adhesive film and the tube includes matching a contour of at least one pressure roller of the plurality of pressure rollers to an external contour of the tube; and pressing the adhesive film and the tube against one another by the plurality of pressure rollers includes at least two pressure roller pairs arranged in series.

6. The method as claimed in claim 1, wherein the at least one component to be coated is structured as a narrow stock and the adhesive layer is a liquid adhesive; wherein applying the adhesive layer includes applying the liquid adhesive to the narrow stock via an application roller; and cooling and rolling up the narrow stock after applying the liquid adhesive.

7. The method as claimed in claim 1, wherein the at least one component to be coated is structured as a narrow stock and the adhesive layer is liquid adhesive; wherein applying the adhesive layer includes applying the liquid adhesive to the narrow stock via an extrusion unit; heating and joining the adhesive layer and the narrow stock to form a coated narrow stock via at least one of pressure rollers and pressure plates; and rolling up the coated narrow stock.

8. The method as claimed in claim 1, wherein the at least one component to be coated is structured as a tube and the adhesive layer is a liquid adhesive; wherein applying the adhesive layer includes applying the liquid adhesive to the tube to form the adhesive layer via an extrusion unit; and cooling the adhesive layer and the tube after applying the liquid adhesive to the tube.

9. The method as claimed in claim 1, wherein the at least one component to be coated is structured as a narrow stock and the adhesive layer is adhesive granules; and wherein applying the adhesive layer includes heating the narrow stock and scattering the adhesive granules onto the narrow stock while heating the narrow stock to melt the adhesive granules and form the adhesive layer; passing the narrow stock with the adhesive layer applied thereto through pressure rollers to join the adhesive granules to the narrow stock to provide a coated narrow stock where the adhesive layer is rendered uniform; and rolling up the coated narrow stock.

10. The method as claimed in claim 1, wherein the at least one component to be coated is structured as a tube and the adhesive layer is adhesive granules; and wherein applying the adhesive layer includes heating the tube and scattering the adhesive granules onto the tube; passing the tube with the adhesive granules applied thereto through pressure rollers to join the adhesive granules to the tube to provide a coated tube where the adhesive layer is rendered uniform; and cooling the coated tube.

11. The method as claimed in claim 1, further comprising performing an optical check of the adhesive layer after applying the adhesive layer to the at least one component.

12. The method as claimed in claim 3, further comprising heating at least one pressure roller of the plurality of pressure rollers prior to passing the adhesive film and the tube through the plurality of pressure rollers.

13. The method as claimed in claim 4, wherein at least one of: pressing the adhesive film and the narrow stock includes matching a contour of at least one pressure roller of the plurality of pressure rollers to an external contour of the narrow stock; and pressing the adhesive film and the narrow stock against one another by the plurality of pressure rollers includes at least two pressure roller pairs arranged in series.

14. The method as claimed in claim 12, wherein one of: pressing the adhesive film and the tube includes matching a contour of at least one pressure roller of the plurality of pressure rollers to an external contour of the tube; and pressing the adhesive film and the tube against one another by the plurality of pressure rollers includes at least two pressure roller pairs arranged in series.

15. The method as claimed in claim 2, further comprising performing an optical check of the adhesive layer after applying the adhesive layer to the at least one component.

16. The method as claimed in claim 3, further comprising performing an optical check of the adhesive layer after applying the adhesive layer to the at least one component.

17. A method for producing a heat exchanger, comprising: adhesively bonding at least two components to one another, at least one component of the two components structured as a narrow stock; heating an adhesive film; heating at least one pressure roller of a plurality of pressure rollers; pressing the heated adhesive film against an outer side of the narrow stock by passing the heated adhesive film and the narrow stock through the plurality of pressure rollers including the at least one heated pressure roller to form a coated narrow stock including an adhesive layer; cooling and rolling up the coated narrow stock; and performing an optical check of the adhesive layer.

18. The method as claimed in claim 17, wherein one of: pressing the adhesive film and the narrow stock includes matching a contour of at least one pressure roller of the plurality of pressure rollers to an external contour of the narrow stock; and pressing the adhesive film and the narrow stock against one another by the plurality of pressure rollers includes at least two pressure roller pairs arranged in series.

19. A method for producing a heat exchanger, comprising: adhesively bonding at least two components to one another, at least one component of the two components structured as a tube; heating at least one pressure roller of a plurality of pressure rollers; pressing the adhesive film against an outer side of the tube via the plurality of pressure rollers including the at least one heated pressure roller; shrinking the adhesive film onto the tube to form an adhesive layer on the tube by heating the adhesive film and the tube via passing the adhesive film and the tube through a furnace; and performing an optical check of the adhesive layer.

20. The method as claimed in claim 19, wherein one of: pressing the adhesive film and the tube includes matching a contour of at least one pressure roller of the plurality of pressure rollers to an external contour of the tube; and pressing the adhesive film and the tube against one another by the plurality of pressure rollers includes at least two pressure roller pairs arranged in series.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In the drawings, which are in each case schematic:

[0020] FIG. 1 shows a method according to the invention for applying an adhesive layer designed as an adhesive film to a strip material,

[0021] FIG. 2 shows an illustration like that in FIG. 1 but for a component designed as a tube,

[0022] FIG. 3 shows an alternative embodiment of the method according to the invention to that in FIG. 2,

[0023] FIG. 4 shows the application of liquid adhesive as an adhesive layer to a heat exchanger component designed as narrow stock,

[0024] FIG. 5 shows an illustration like that in FIG. 4 but with an extrusion unit,

[0025] FIG. 6 shows the spraying of an adhesive layer onto a component designed as a tube, using liquid adhesive,

[0026] FIG. 7 shows an illustration like that in FIG. 6 but with a different application unit,

[0027] FIG. 8 shows the application of adhesive designed as granules as an adhesive layer to a component designed as narrow stock,

[0028] FIG. 9 shows an illustration like that in FIG. 8 but with a component designed as a hot tube.

DETAILED DESCRIPTION

[0029] Alternative methods for applying an adhesive layer 1 to a heat exchanger component 2 to be coated (heat exchanger not shown) are shown in each of FIGS. 1 to 9, wherein the adhesive layer 1 is in each case applied to an outer side of the component 2, irrespective of the individual method steps of the alternative methods.

[0030] Considering the method shown in FIG. 1, the component 2 to be coated is designed as narrow stock 3 and the adhesive layer 1 is designed as adhesive film 4. Here, both the adhesive film 4 and the component 2 designed as narrow stock 3 are rolled up, namely, on the one hand, on an adhesive film roll 5 and, on the other hand, on a narrow stock roll 6. In a first method step, a surface of the narrow stock 3 to be coated with the adhesive layer 1 is then degreased and brushed, this taking place in a cleaning unit 7. In this case, degreasing and brushing can be performed by plasma or corona discharge or the like, for example. The adhesive film 4 is then heated by means of a heating unit 8, wherein the heating unit 8 can be designed as an infrared radiator or as an electric heating unit, for example. Once the adhesive film 4 has been heated, it is passed through pressure rollers 9 together with the narrow stock 3 to be coated and, during this process, they are pressed against one another. The coated narrow stock 3, i.e. the fully coated component, can then be cooled in a defined manner in a cooling unit 10, thereby enabling the coated component 11 to be rolled up more quickly. Before the fully coated components 11 is rolled up, it usually passes through an optical checking unit 12, in which discoloration, bubbles etc. are detected by means of an optical sensor. Arranged ahead of the cleaning unit 7 and after the optical checking unit 12 there are respective buffers, namely an initial buffer 13 and a final buffer 14. The narrow stock 3 can be an aluminum sheet, for example, which makes the narrow stock 3 not only well-suited to storage but also easy to process. By means of the method according to the invention, it is thus possible to apply the adhesive layer 1, by means of which a plurality of coated components 11 are subsequently adhesively bonded to one another and to form a heat exchanger, in a reliable process, continuously, with high-quality and, at the same time, at low cost. Moreover, the method according to the invention makes it possible to at least reduce, and preferably even to avoid, the risk of a nonuniform thickness of the adhesive layer 1.

[0031] Considering FIG. 2, it is possible to see there a method in which the component 2 to be coated is designed as a tube 15 and the adhesive layer 1 is designed as an adhesive film 4, just as in FIG. 1. In this method too, a surface of the tube 15 to be coated with the adhesive layer 1 is preferably first of all degreased and brushed, more specifically in the cleaning station 7. The adhesive film 4 and the tube 15 to be coated are then pressed against one another by pressure rollers 9, wherein the adhesive film 4 and the tube 15 to be coated are heated in the subsequent heating unit 16, e.g. a furnace 17, and, during this process, the adhesive film 4 is shrunk onto the tube 15 to be coated. After exit from the heating unit 16 or furnace 17, the coated component 11 once again passes through an optical checking unit 12 for quality assurance. Purely theoretically, it is also conceivable here for the tube 15 to be coated to be heated not only from the outside by the heating unit 16 or furnace 17 but also from the inside, e.g. by a hot air flow passed through the interior of the tube.

[0032] If the component 2, i.e. the tube 15, is produced by extrusion, for example, the heat of the tube 15 which arises during this process can also be used to shrink on the adhesive layer 1 or adhesive film 4. Here, the adhesive film 4 is likewise rolled up on an adhesive film roll 5 and, as a result, is easy to handle and easy to store. Considering the method according to the invention shown in FIG. 3, this differs from the method illustrated in FIG. 2 in that a plurality of pressure rollers 9 or pressure roller pairs arranged in series is provided, the axes 8 of which rollers are designed are aligned in such a way that they enable the adhesive film 4 to be pressed against the outer contour of the tube 15 to be coated and to hug said outer contour in a bubble-free manner. As an alternative, it is also conceivable for at least one pressure roller 9 to have a contour 19 matched to the outer contour of the component 2 to be coated, in this case the tube 15 to be coated, and, as a result, likewise to enable bubble-free and reliable application of the plastic film 4 to the tube 15 to be coated. Here, one of these pressure rollers 9 can furthermore be heatable, thereby making it possible to achieve an even better application and fixing process. By means of pressure rollers 9 designed and aligned in this way, the risk of defects can be considerably reduced and, as a result, production quality can be considerably enhanced. Moreover, processing of tubes 15 of different diameters or tube geometries is also conceivable simply by swapping the pressure rollers 9 or by spring mounting different pressure roller pairs.

[0033] In the method shown in FIG. 4, the component 2 to be coated is designed as narrow stock 3 and the adhesive layer is designed as an initially liquid adhesive 20. Here, a surface of the narrow stock 3 to be coated with the adhesive layer 1 is preferably once again first of all degreased and brushed in the cleaning station 7, whereupon the still-liquid adhesive 20 is then applied by means of an application roller 21 to the narrow stock 3 to be coated. Transfer of the liquid adhesive 20 to the application roller 21 is accomplished by means of a transfer roller 22, for example. Once the adhesive layer 1 or liquid adhesive 20 has been applied by means of the application roller 21 to the previously degreased and brushed surface of the narrow stock 3 to be coated, the now coated component 11 once again passes through a cooling unit 10, in which the adhesive layer 1 is firmly fixed on the narrow stock 3. The advantage of a liquid adhesive 20 of this kind is, in particular, the fact that it can initially be supplied as granules and can be melted as required. By this means too, a continuous application process is possible.

[0034] In the methods illustrated in FIG. 5, the liquid adhesive 20 is applied by means of an extrusion unit 23, either continuously or, as illustrated, spotwise, wherein the adhesive layer 1 and the component 2 designed as narrow stock 3 are then heated and joined together by pressure rollers 9 or pressure plates 24. The now coated narrow stock 3, i.e. the fully coated component 11, is then likewise rolled up again. By means of the pressure rollers 9 or pressure plates 24, particularly uniform distribution of the adhesive layer 1 on the narrow stock 3 can be achieved.

[0035] Considering the methods shown in FIGS. 6 and 7, these differ only in having a different application unit 25, by means of which the liquid adhesive 20 can be applied to the tube 15 to be coated, e.g. spotwise or as a continuous strip of adhesive. After coating, the coated tube 15 once again passes through a cooling unit 10 and an optical checking unit 12, wherein the adhesive layer 1 is fixed on the tube 15 in the cooling unit 10, and the quality of the application process is checked in the checking unit 12.

[0036] Considering now the alternatives of the method according to the invention shown in FIGS. 8 and 9, it can be seen there that, according to FIG. 8, the component 2 to be coated is designed as narrow stock 3 and, according to FIG. 9, as a tube 15. The adhesive layer 1 is initially designed as adhesive granules 26 or, more generally, as granules 26. In both methods, the surface of the component 2 to be coated, i.e. the narrow stock 3 to be coated or the tube 15 to be coated, is once again preferably first of all degreased and brushed in the cleaning unit 7. In respect of the further procedure, however, the two methods are different.

[0037] According to FIG. 8, the narrow stock 3 to be coated is then heated, and the granules 26 are then scattered onto said narrow stock, as a result of which they melt to form the adhesive layer 1 and occupy the surface to be coated of the narrow material 3. The coated narrow stock 3 is then passed with the applied adhesive layer 1 through pressure rollers 9 and, during this process, the adhesive layer 1 is rendered uniform and additionally joined to the narrow stock 3. In the method shown in FIG. 9, in contrast, the tube 15 to be coated is heated and the adhesive granules 26 are scattered onto the hot tube 15. Here too, the following pressure rollers bring about greater uniformity and better bonding of the adhesive layer 1 to the tube 15. The coated component 11, i.e. the tube 15 covered with the adhesive layer 1, is then cooled in the cooling unit 10 and checked in the optical checking unit 12 for any defects, bubbles etc.

[0038] Common to all the alternatives of the method according to the invention which are shown is the fact that the application of the adhesive layer 1 to the component 2 is possible in a reliable process, continuously, in a manner which saves resources and furthermore at low cost and, at the same time, a very high quality standard in respect of the application quality can be achieved. Corrugated fins or other component parts of a heat exchanger can be formed or stamped from the coated component 11, for example. It is likewise possible to install the coated tubes 15 in a heat exchanger of this kind.