Abstract
A heat exchanger, at least comprising a plurality of rows of media guiding ducts (12) for passing a media flow and a plurality of rows of fluid ducts for passing fluid to be temperature-controlled, and having strip-shaped flow profile parts (20), wherein at a transition between the respective guide part of the flow profile parts (20) and their plug-in part two mutually opposite steps are formed, which allow the flow profile part (20) to sit on the adjacent end faces of a fluid duct without spacing, wherein the flow profile part (20) does not project at any point into a free opening cross section, which is defined by the imaginary extension of the inner, mutually facing boundary walls of a media duct (12) and by a media inlet of this duct (12).
Claims
1. A heat exchanger, comprising at least a plurality of rows of media guiding ducts (12) for passing a media flow along their inner, mutually facing boundary walls (44) and a plurality of rows of fluid ducts (14) for passing fluid to be temperature-controlled, in particular to be cooled, wherein said fluid ducts are at least in part located in pairs opposite from each other and accommodate at least one row of media guiding ducts (12) between each other, at least one of the free rectangular end faces of which without coating form a media inlet (18), wherein at least some of the fluid ducts (14) have a deflector device, which routes contaminant particles (36) entrained in the medium at least in part away from the fluid ducts (14) in the direction of the media ducts (12), wherein said deflector device is formed by a strip-shaped flow profile part (20), which is arranged on the free end face (34) of an assignable fluid duct (14) and closes the latter outwards towards the environment and projects beyond the latter, and wherein said deflector device has a guide part (24) and a plug-in part (22), which is in one piece connected to the guide part (24) and is inserted into the respective assignable fluid duct (14), characterized in that at the transition between the guide part (24) and the plug-in part (22) two mutually opposite steps (28) are formed, which allow the flow profile part (20) to sit on the adjacent end faces (34) of a fluid duct (14) without spacing, and in that the flow profile part (20) does not project at any point into a free opening cross section (40), which is defined by the imaginary extension (42) of the inner, mutually facing boundary walls (44) of a media duct (12) and by the media inlet (18).
2. The heat exchanger according to claim 1, characterized in that the respective flow profile part (20) has at least one guide surface (30, 32), which routes the media flow in the direction of the media inlet (18) to at least one adjacent media duct (12).
3. The heat exchanger according to claim 1, characterized in that the guide surface (30, 32) of the respective flow profile part (20) is formed to be flat, curved or stepped at least in sections.
4. The heat exchanger according to claim 1, characterized in that two guide surfaces (30, 32) of a flow profile part (20) are formed to extend towards each other on the end facing away from the assignable fluid duct (14).
5. The heat exchanger according to claim 1, characterized in that two guide surfaces (30, 32) of a flow profile part (20) are formed at an acute angle to each other.
6. The heat exchanger according to claim 1, characterized in that the fluid ducts (14) each open out on both sides into a collecting space (4), and in that the media guiding ducts (12) are delimited by fins, which extend in a row arrangement at least partially between the adjacent fluid ducts (14).
7. The heat exchanger according to claim 1, characterized in that, at least during operation, the fluid ducts (14) extend horizontally between the collecting chambers (4) and in that the fins delimit, in particular in a zig-zag arrangement, the media ducts (12).
8. A deflector device for a heat exchanger according to claim 1, characterized in that at least one strip-shaped flow profile part (20) having at least one guide surface (30, 32) of a guide part (24) is provided, which is provided with a plug-in part (22), and in that two mutually opposite steps (28) are formed at the transition between the guide part (24) and the plug-in part (22).
Description
[0018] The invention is explained in detail below with reference to exemplary embodiments shown in the drawing. In the Figures:
[0019] FIG. 1 shows a perspective oblique view of an exemplary embodiment of the heat exchanger according to the invention, viewed in the direction of the media incident-flow end;
[0020] FIG. 2 shows a side view of the exemplary embodiment;
[0021] FIG. 3 shows a perspective oblique view of the separately shown flow guide profile part of the exemplary embodiment;
[0022] FIG. 4 shows a highly schematic simplified partial section of the air entrance area of the exemplary embodiment, wherein the course of the media flow, influenced by the flow profile parts, is shown by symbolically indicated contamination particles; and
[0023] FIG. 5 shows a representation, corresponding to FIG. 4, of a second exemplary embodiment of the heat exchanger according to the invention.
[0024] The exemplary embodiment of the heat exchanger, shown in FIGS. 1 to 5, has, as shown in FIG. 1, an end face 2 exposed to the media flow, such as an air flow, and having a rectangular outline. On both sides, to the end face 2 main struts 4, forming a support structure, adjoin, each of which is shaped like a web-like hollow box having a square or any other cross-section, and each of which forms a collecting space for a liquid fluid in this case transporting heat. It can be a cooling liquid, such as a water-glycol mixture, or a fluid to be cooled, such as hydraulic oil. At the upper and lower end, the struts 4 are interconnected by means of support strips 6, of which two front strips 6 are extending in the plane of the front face 2 and two rear strips 6 are extending in the plane of the rear face 8 of the heat exchanger. Ports 10 are arranged at the ends of the struts 4 for the inflow and outflow of the fluid into and out of the collecting chambers. Instead of a cooling liquid as fluid, however, a thermal fluid, thus a heated fluid, can also be used to heat the same.
[0025] In the usual manner for such heat exchangers and as shown in the aforementioned document DE 10 2010 046 913 A1, superposed rows of media ducts 12 (see FIGS. 4 and 5), designated by the numeral 5 in FIG. 1 of the aforementioned document, are provided between the struts 4. Fluid ducts 14 are located between the media ducts 12 each, which each are connected to the collection chambers in the struts 4 in a fluid conveying manner. The fluid ducts 14 are each separated from the air ducts 12 by plane plates 16 (designated by the numeral 1 in FIG. 1 of said document). In the manner also usual for heat exchangers of this type, to increase the heat transfer surface in the media ducts 12 fins (designated by the numeral 19 in said document) are provided in a preferably zigzag arrangement, which are omitted in present drawing of FIGS. 4 and 5. In the exemplary embodiments shown here, for instance, 37 ducts 12, of which are only a part is numbered in FIG. 1, are provided, which extend in horizontal planes between the struts 4 when the heat exchanger is set up on the lower strips 6.
[0026] As shown in FIGS. 4 and 5, a deflector is arranged at the media or air inlet 18 of each media duct 12, forming a flow profile part, around which the incoming media flow flows and which is designated by the numeral 20 in the exemplary embodiments and only partially is numbered in FIGS. 1 and 2. As shown in FIG. 3, in which a single flow profile part 20 is shown, the flow profile parts 20 are each formed by a profile strip extending in one piece between the struts 4. The profile of the flow profile parts 20 has a foot part or plug-in part 22 and a thereto adjoining head part or guide part 24. The plug-in part 22 has the form of a flat band having flat, parallel lateral surfaces, which are plugged into the ends of the fluid ducts 14 in a well-fitting manner, wherein the plug-in part 22 forms the fluid-tight end closure of the fluid ducts 14. At the transition of the plug-in part 22 to the guide part 24, the flow profile part 20 is extended by a step 28, see FIG. 3, which in the inserted state, see FIG. 4, reaches flush over the end edges 34 at the media inlet or air inlet 18 of the plates 6 towards the outside, see FIGS. 4 and 5, in a flush-fitting manner. With its both lateral surfaces, extending from the two opposite steps 28, the guide part 24 forms guide surfaces 30 and 32 each, which, laterally inclined and converging in a planar manner, unite in a point 35. In that way, the flow profile parts 20 form rows of pointy tapered ribs, whose cross-section corresponds to an acute triangle and which project outwards out of the plane of the incident-flow surface at the end face 2 of the heat exchanger, which is defined by the plane of the media inlets or air inlets 18. As shown in FIG. 4, in which contamination particles are symbolically indicated and designated by the numeral 36, the guide surfaces 30 and 32 deflect the particles 36, entrained in the media flow, from the direction of flow towards the media inlets 18, thereby promoting particle removal through the guide ducts 12 and simultaneously reducing the risk of buildup at the inlet 18.
[0027] FIG. 5 shows an exemplary embodiment having, compared to the first exemplary embodiment, a modified profile contour of the guide 24 of the flow profile parts 20. As in the first exemplary embodiment, the foot part and plug-in part 22 forms the end closure of the fluid ducts 14, wherein, as in the previous exemplary embodiment, the steps 28, extending the profile width, reach over the end edges 34 of the plates 16. The guide parts 24, which in turn project forward from the plane of the end face 2 having the inlets 18, also have the converging lateral guide surfaces 30 and 32, as in the first exemplary embodiment. However, these have a stepped course, wherein they end, instead of in the tip 35, in a narrow end surface 38. In the exemplary embodiment shown in FIG. 5, the guide surfaces 30 and 32 are stepped twice having the same step height, wherein the width of the end surface 38 is approximately % of the profile width of the guide part 24.
[0028] Just as the media guide ducts 12 have zigzag-shaped or meandering fins for improved flow guiding and heat exchange, there can also be flow guides of comparable construction in the fluid ducts 14 for flow guiding of the fluid, viewed in the direction of the incident flow. It is also possible to form the free end face of the deflector device 20 as a calotte when viewed in cross-section. Particularly preferably, the free end face of the fluid duct 14 can be closed by an adapter mount, which allows different types of profiles to be used interchangeably on the heat exchanger 1, wherein it is also possible depending on the specifications to exchange differently formed profile cross-sections using the adapter (not shown).
[0029] As FIGS. 4 and 5 further show, the imaginary extensions 42 of the inner boundary walls 44, facing each other, of a media guiding duct 12 together with the associated media inlet 18 form across the width of the heat exchanger a substantially rectangular incident-flow space, which is left clear of the flow profile parts 20. In particular, none of the guide surfaces of the flow profile parts 20 extend into the flow space defined, so that the free entrance flow into the respective media guiding duct 12 is not impaired.
