EP1203923B1 - Heat exchanger, in particular condensation laundry drier - Google Patents

Heat exchanger, in particular condensation laundry drier Download PDF

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Publication number
EP1203923B1
EP1203923B1 EP01125856A EP01125856A EP1203923B1 EP 1203923 B1 EP1203923 B1 EP 1203923B1 EP 01125856 A EP01125856 A EP 01125856A EP 01125856 A EP01125856 A EP 01125856A EP 1203923 B1 EP1203923 B1 EP 1203923B1
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EP
European Patent Office
Prior art keywords
pipes
lamellae
heat exchanger
frames
disposed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01125856A
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German (de)
French (fr)
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EP1203923A3 (en
EP1203923A2 (en
Inventor
Michael Kozica
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AKG Thermotechnik GmbH and Co KG
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AKG Thermotechnik GmbH and Co KG
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Publication of EP1203923A2 publication Critical patent/EP1203923A2/en
Publication of EP1203923A3 publication Critical patent/EP1203923A3/en
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Publication of EP1203923B1 publication Critical patent/EP1203923B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/001—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/126—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element consisting of zig-zag shaped fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
    • F28F21/062—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material the heat-exchange apparatus employing tubular conduits

Definitions

  • the invention relates to a heat exchanger of the type specified in the preamble of claim 1.
  • Heat exchangers of this type are known in numerous embodiments. They serve in their application to dryers the purpose of the coming of a dry room, wet process air to pass through process air channels while cooling with ambient air or ambient air flowing through cooling air channels.
  • the heat exchangers act as condensers for the process air, and the condensing water dripping from this drips into a collecting vessel. The thus dried process air is passed again after heating in the drying room.
  • the process air and cooling air channels are usually perpendicular to each other, so that the heat exchanger is flowed through in cross-flow of the process air and the cooling air.
  • heat exchangers with heat conduction elements pressed by elastic tension against the tubes are known (GB-A-2 216 643), in which recesses in the heat conducting elements have the same radius of curvature as the tubes.
  • heat exchangers made entirely of plastic can be produced comparatively inexpensively (eg EP 0 044 561 A2, EP 0 429 953 B1, DE 198 38 525 A1, DE 198 53 526 A1).
  • heat exchangers interfere with the poor heat conduction of the plastics to be used or the resulting lack of heat transfer, especially on the cooling air side.
  • Like. In or on the cooling air ducts lead here hardly to the desired products of heat transfer coefficient and heat exchange surface. This also applies if instead of individual tubes multi-tube or multi-chamber profiles are applied (DE 39 29 004 A1).
  • heat exchangers of the type described are known (US-A-3 489 209), which consist of plastic existing pipes and metal lamellae. The slats are not directly with the pipes, but with additional metal elements in contact, which in turn surround the plastic pipes. As a result, the heat exchanger on additional components.
  • heat exchangers which have frames made of plastic and pipes, which optionally consist of plastic or metal, wherein the frame and tubes can be connected to each other by a simple plug connection (DE 296 18 878 U1).
  • heat exchangers have no means for increasing the heat transfer, so that they are not useful for all and especially not for the above-mentioned applications.
  • the invention is therefore based on the technical problem of the heat exchanger of the type described initially in such a way that on the one hand has good heat transfer and heat transfer properties, on the other hand, however, can be produced inexpensively and with a relatively low overall weight.
  • the invention is based on the idea to combine the advantages of plastic and metal materials.
  • conventional plastics such as thermoplastics used, while where the heat conduction magnifying agent must be provided, made of metals such. B. aluminum-made slats, baffles od. Like. Be provided.
  • the means for achieving good heat exchange properties are held by elastic tension with the plastic pipes in investment, which can be a simple, inexpensive assembly of the various parts can be achieved.
  • Through the use of pipes and frames made of plastic also has the advantage that inexpensive connection methods can be applied by the pipes and frames z. B. are interconnected by plastic welding process. Further advantageous features of the invention will become apparent from the dependent claims.
  • the tubes 1 and 2 schematically show a plurality of tubes 1 formed as individual tubes, which have oval cross-sections and in a plurality of planes parallel to each other and in each plane parallel to each other in a plurality of columns are arranged.
  • the tubes 1 have wide wall sections 2 and narrow wall sections 3 and are arranged in the exemplary embodiment so that within each level their respective narrow wall sections 3 face each other, whereas in each case the broad wall sections 2 face each other in planes arranged one above the other.
  • the tubes 1 are arranged at preselected intervals so that between them channels 4 (Fig. 1) are present.
  • the tubes 1 are preferably used as flow channels for moist, coming from a drying room process air, while the channels 4 are arranged as perpendicular to the tubes 1 flow channels for cooling air and with heat conducting elements in the form of Slats 5 are provided, the z. B. from meandering shaped, in heat exchangers known per se strips and the tubes 1 facing, with the wide wall sections 2 to the plant coming broad sides 5a have.
  • the lamellae 5 preferably completely fill the channels 4 in a central part of the heat exchanger, while leaving free pipe ends 1a (FIG. 1) in front and behind in the outer sections. These are, as shown in FIG. 3, inserted in the assembly of the heat exchanger in openings 6 of frame 7, which are attached to the front and rear end of the heat exchanger and keep the tubes 1 at a distance.
  • the tubes 1 and frame 7 made of a plastic, for.
  • a plastic for.
  • a thermoplastic in the form of a polyolefin (PE, PP) or polyester (PET, PBT or ABS).
  • PET polyolefin
  • PET polyethylene
  • PBT polybis(ethylene terephthalate)
  • ABS polystyrene
  • the connection of the tubes 1 and the frame 7 can cost, ie od without the use of adhesives.
  • plastic welding methods such as ultrasonic, vibration, friction thermal contact, induction, laser or heating element welding are made, as indicated in Fig. 3 by blackened welds 8.
  • the pipe ends 1a can also be slightly widened for this purpose.
  • the lamellae 5 according to the invention consist of highly thermally conductive metals, and their preparation takes place for. B. in that thin aluminum strips are folded meandering.
  • the tubes 1 and fins 5 are elastically clamped together.
  • Fig. 3 to a heat exchanger, the tubes 1 are arranged to facilitate the representation in only one plane and analogous to FIGS. 1 and 2 together with one in each case in Fig. 3 above or below slat 5 one of Frame 7 together held pile.
  • This stack is braced from both sides by a respective side part 9 (or an end plate) which projects positively with its ends into corresponding recesses 10 of the frame 7 and thereby with its upper or lower broad side on a wide side facing it an associated lamella 5 is present.
  • At least one side part 9 in the relaxed state consists of a plate-shaped, but pre-bent sheet metal part, of which the lamella 5 facing and with this coming to rest broadside is convex, as shown in Fig. 3 schematically by a dot-dash line shown side part 9a is indicated.
  • the assembly of the various parts takes place z. B. characterized in that the stack formed from the tubes 1, the fins 5 and the side parts 9a od with a press. Like. Is compressed so that the side parts 9a from the pre-bent shape in a in Fig. 3 shown by solid lines, be brought in substantially plane-parallel shape 9.
  • the front and the rear frame 7 are attached, wherein the ends of the now acting as leaf springs side parts 9 enter the recesses 10 and are held in a form-fitting manner, while the pipe ends 1a with sufficient clearance in the openings 6, with the slats. 5 get into intimate contact and then liquid-tight or gas-tight welded to the frame 7 to form a stable heat exchanger block.
  • the side parts 9 are preferably extending over the entire width and depth of the heat exchanger block and therefore each act on the entire surface of their associated broad sides 5a of the outermost fins 5.
  • the lamellae 5 are preferably comparatively rigid in directions transverse to their broad sides in order to ensure a uniform transmission of force.
  • the heat exchanger according to the invention preferably has an additional means for improving the heat transfer or heat-conducting contact brought about by the elastic tensioning.
  • This agent contains z. B. to the respective pipe shape adapted broad sides 5a of the slats 5, wherein expediently at least those broad sides 5a are adapted, which abut the tubes 1.
  • These take in the embodiment in stacking the wide wall sections 2 of the tubes 1 and therefore have like this a substantially oval or parabolic contour.
  • the arrangement is preferably such that the radii of curvature of the recesses 5b are slightly larger than those of the tubes 1 in the region of the wide wall sections 2 (Fig. 2, left half). If the lamellae 5 are therefore pressed against the tubes 1 by the side parts 9 with a certain prestress (FIG. 2, right half), then they are pressed into a somewhat flatter shape and broadly formed into a good heat-conducting contact with the depressions 5b Placed surfaces of the slats 5, as clearly seen from a comparison of the left and right half of Fig. 2. It is clear that the distances from each other facing broad sides 5a of the slats 5 should be greater than the measured transverse to the broad sides 2 thickness of the tubes 1, so that a sufficiently large elastic contact pressure can be exerted.
  • the recesses 5b have, as shown in particular Fig. 1, in the assembled state continue the effect of a displacement assurance of the slats 5 against displacements transverse to the tube axes, whereby a total stable block formation is achieved even with thin wall thicknesses of the various parts.
  • the tubes 1 can be provided with different wall thicknesses for this purpose.
  • the tube outer walls and / or the facing broad sides 5a of the lamellae 5 can be covered with a thermal compound to improve the heat transfer.
  • both opposite broad sides 5a of the slats 5 are provided with the recesses 5b. It is understood that in the embodiment, such as the broad sides 5a are not continuously continuous (Fig. 1), but from the adjoining them sections of the meandering aluminum strips are formed.
  • Each two adjacent tubes 15 have a web 17 arranged between them in common.
  • the wide, between two webs arranged wall portions 16 are curved analogous to the tubes 1 (Fig. 1) oval or convex to the outside.
  • a plurality of multi-chamber profiles 14 are arranged next to one another or according to FIGS. 5 and 6 in several planes one above the other.
  • the multi-chamber profiles 14 consist according to the invention of plastic and can cost z. B. be prepared by extrusion.
  • lamellas 18 each consisting of metal are arranged between the individual multi-chamber profiles 14 or on their two sides forming the wide wall sections 16;
  • the multi-chamber profiles 15 are held on the lamellae 18 free ends 14 a (Fig. 4) in plastic frame 19 (Fig. 5), which the frame 7 of FIG. 3 except for the difference that they have openings 20 with a the width of the multi-chamber profiles 14 have corresponding length.
  • a stack formed from at least one multi-chamber profile 14 and an associated lamella is braced elastically to form a stable heat exchanger block on the upper side and possibly also on the lower side by a respective side part 21.
  • At least one of the side parts 21 is for this purpose as the side part 9a of FIG. 3 in the relaxed Condition convexly pre-bent, in the assembled state, however, formed with its ends in the manner of a leaf spring to a substantially plane-parallel plate by its ends are positively received in corresponding recesses 22 of the frame 19.
  • the side parts 21 extend between the frames 19 over the entire width and depth of the heat exchanger (Fig. 5).
  • each multi-chamber profile 14 includes a plurality of juxtaposed tubes 15, wherein the convex curvature of the individual broadside or wall sections 16 is selected so that it due to assembly 6), whereby an intimate contact between the wide wall sections 16 and the broad sides of the fins 18 and a good heat transfer between the process air side (tubes 15) and the cooling air side (fins 18 ). Because of the small width that can be given to each pipe section 15 without significant impairment of the desired function, there is no risk that the broad sides when pressing the fins 18 concave bend, as in the application of a single tube 1 on the size of a Multi-chamber profile 14 would inevitably be the case.
  • the assembly of the heat exchanger of Fig. 4 and 5 is analogous to that of FIG. 1 to 3.
  • the compound of the multi-chamber profiles 14 and the frame 19 is effected as shown in Fig. 1 to 3 expediently by welding.
  • sliding safety devices are additionally provided according to the invention.
  • These retaining webs 23 lie in the assembled Condition from the outside to lie between the multi-chamber profiles 14 slats 18 and thereby prevent their lateral displacement.
  • the right and left side surfaces of the lamellae 18 may be provided with retaining webs 24 projecting beyond their height, which in the installed state bear against the multichamber profiles 14 lying between the lamellae 18 from outside and thereby prevent lateral displacements of the fins 18.
  • FIGS. 7 and 8 are distinguished from those of FIGS. 1 to 6, characterized in that first and second tubes 26, 27 in the form of multi-chamber profiles and first and second frames 28, 29 each form units that are made of one piece plastic Consist of injection molded parts.
  • first and second tubes 26, 27 in the form of multi-chamber profiles and first and second frames 28, 29 each form units that are made of one piece plastic Consist of injection molded parts.
  • To simplify the production of the heat exchanger is composed of three parts, namely the first, z. B. front frame 28 and attached thereto first tubes 26, the second, z. B. rear frame 29 and attached thereto second tubes 27 and between the tubes 26, 27 to be arranged, here wave-shaped or also according to FIG. 4 to 6 formed slats 30 with the same thickness.
  • the tubes 26 of the front frame 28 are perpendicular to the rear and the tubes 27 of the rear frame 29 each perpendicular to the front, wherein they are each coaxially aligned with passages 31 which pass through the frames 28, 29 to the tubes 26th , 27 analogous to FIG. 3 and 5 od to be arranged on the outer sides of the frame 28, 29 collecting boxes.
  • the tubes 26 of the front frame 28 are perpendicular to the rear and the tubes 27 of the rear frame 29 each perpendicular to the front, wherein they are each coaxially aligned with passages 31 which pass through the frames 28, 29 to the tubes 26th , 27 analogous to FIG. 3 and 5 od to be arranged on the outer sides of the frame 28, 29 collecting boxes.
  • the tubes 26 of the front frame 28 are perpendicular to the rear and the tubes 27 of the rear frame 29 each perpendicular to the front, wherein they are each coaxially aligned with passages 31 which pass through the frames 28, 29 to the tubes 26th , 27 analogous to FIG
  • first and second tubes 26 and 27 are arranged alternately in different planes, wherein in FIG. 7 the frame 28 forms three first and the frame 29 two second tube planes and in each case a plane of tubes 27 between two levels of tubes 26 is arranged.
  • the tubes 26, 27 it would also be possible to attach the tubes 26, 27 to the frame 28, 29, that in each plane both first tubes 26 of a frame 28 and second tubes 27 of the other frame are arranged.
  • the tubes 26 and 27 have tapered cross-sections, which are largest in the region of the associated frames 28, 29 and gradually decrease in the direction of their free ends. This facilitates, inter alia, the demolding of the units 26, 28 and 27, 29 in their production by injection molding of plastic.
  • the frames 28, 29 have further passages 32. These are sized and shaped so that they can accommodate the free ends of those tubes 26, 27 in themselves, which are fastened to the respective other frame 28, 29. Therefore, the two consisting of the frame 28 and the tubes 26 and from the frame 29 and the tubes 27, each integrally manufactured units in the manner shown in Fig. 7 in the direction of arrows v , w are moved toward each other until the free Ends of the tubes 26, 27 respectively enter into the associated passages 32 of the frame 28, 29, thereby obtained analogous to Fig. 1 to 3, a block in which the free ends of the individual tubes 26, 27 and the frames 28, 29 preferably by Welding can be connected with each other.
  • the cross-sectional tapers of the tubes 26, 27 are preferably uniform throughout. This results in the joining of the two units between the tubes 26, 27 channels with continuously substantially constant height, which allows the arrangement and uniform contact of fins 30 with the same thickness throughout and facilitates. Moreover, it is clear that the passages 31, 32 arranged in the manner of a grid distributed in the frame 28, 29, as it corresponds to the arrangement of the frame 28, 29 fixed pipes.
  • such a dimensioning of the cross-sectional tapers of the tubes 26, 27 is provided that when approaching the frame 28, 29 in the direction of arrows v and w previously inserted slats 30 analogous to the embodiments of FIG. 1 to 6 transverse to the tubes 26, 27 elastically biased and thereby brought into a good heat-conducting contact with these.
  • the means could be to provide the tubes 26, 27 analogous to FIG. 1 to 6 with trapezoidal or oval cross-sections, in addition to their wide wall sections elastically deform and / or provide pre-bent side portions 33 which are positively inserted into recesses 34 of the frame 28, 29 and elastically clamp the entire block.
  • the invention has the advantage that on the side of the tubes (eg process air side) smooth and thus insensitive surfaces, on the side of the fins or baffles (eg cooling air side), however, large heat exchange surfaces with high heat conductivity are obtained in the individual surface sections, as z. B. in the application of heat exchanger described in tumble dryers is desired.
  • the invention is not limited to the described embodiments, which can be modified in many ways. This applies z. B. for the tube shapes used in the individual case, since the tubes can be provided in particular with other than the buckling and cross sections shown. Further, if necessary, the pipes can be internally provided with webs which are known per se and enlarge their surfaces, or the like, which, although they are of little use in terms of their heat conduction, can give them increased stability. Also, the combination of single tubes and multi-chamber tubes within one and the same heat exchanger is possible. Furthermore, the number of tubes and fins used and the number of tube levels provided per heat exchanger depend entirely on the needs of the individual case.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

An automotive radiator or heat exchanger consists of a sandwich pack of layers of thin tubes (2) separated from the adjacent layer by a corrugated panel of especially semi-flexible material (5). The sandwich pack is held together by a clip or strap.

Description

Die Erfindung betrifft einen Wärmeaustauscher der im Oberbegriff des Anspruchs 1 angegebenen Gattung.The invention relates to a heat exchanger of the type specified in the preamble of claim 1.

Wärmeaustauscher dieser Art sind in zahlreichen Ausführungsformen bekannt. Sie dienen bei ihrer Anwendung auf Wäschetrockner dem Zweck, die von einem Trockenraum kommende, feuchte Prozeßluft durch Prozeßluft-Kanäle zu leiten und dabei gleichzeitig mit durch Kühlluft-Kanäle strömender Umgebungs- bzw. Raumluft zu kühlen. Die Wärmeaustauscher wirken dabei als Kondensatoren für die Prozeßluft, und das aus dieser kondensierende Wasser tropft in ein Auffanggefäß ab. Die dadurch getrocknete Prozeßluft wird nach Erwärmung erneut in den Trockenraum geleitet. Die Prozeßluft- und Kühlluft-kanäle stehen meistens senkrecht zueinander, so daß der Wärmeaustauscher im Kreuzstrom von der Prozeßluft und der Kühlluft durchströmt wird.Heat exchangers of this type are known in numerous embodiments. They serve in their application to dryers the purpose of the coming of a dry room, wet process air to pass through process air channels while cooling with ambient air or ambient air flowing through cooling air channels. The heat exchangers act as condensers for the process air, and the condensing water dripping from this drips into a collecting vessel. The thus dried process air is passed again after heating in the drying room. The process air and cooling air channels are usually perpendicular to each other, so that the heat exchanger is flowed through in cross-flow of the process air and the cooling air.

Zur Erzielung eines wirksamen Wärmeaustauschs und zur Vermeidung von Verschmutzungen ist es in der Regel erwünscht, die Prozeßluft durch Kanäle mit großen, glatten Oberflächen zu leiten, was wegen des durch die Feuchtigkeit verbesserten Wärmeübergangs im Hinblick auf den gewünschten Wärmeaustausch ausreichend ist. Dagegen werden auf der Kühlluftseite vorzugsweise Mittel in Form von Lamellen oder Leitblechen vorgesehen, die die wärmeaustauschenden Oberflächen der Kühlluft-Kanäle vergrößern und den mangels Kondensation schlechteren Wärmeübergang derart kompensieren sollen, daß sich auf der Prozeßluft- und der Kühlluftseite annähernd gleiche Produkte aus Wärmeübergangszahl und Wärmeaustauschsfläche ergeben. Außerdem werden derartige Wärmeaustauscher bis heute mit Ausnahme der Rahmen entweder komplett aus einem Metall wie z. B. Aluminium oder komplett aus Kunststoff hergestellt.In order to achieve efficient heat exchange and to avoid contamination, it is usually desirable to pass the process air through channels with large, smooth surfaces, which is sufficient because of the moisture-enhanced heat transfer in view of the desired heat exchange. In contrast, on the cooling air side preferably means in the form of fins or baffles are provided, which increase the heat-exchanging surfaces of the cooling air channels and compensate for the lack of condensation poorer heat transfer so that on the process air and the cooling air side approximately the same products of heat transfer coefficient and heat exchange surface result. In addition, such Heat exchanger to date with the exception of the frame either completely made of a metal such. As aluminum or completely made of plastic.

Komplett aus Metall hergestellte Wärmeaustauscher arbeiten im Hinblick auf den gewünschten Wärmeaustausch einwandfrei. Ein Nachteil sind ihre vergleichsweisen großen Herstellungskosten, die einerseits durch die Anwendung von Aluminium, andererseits durch die zur Verbindung der Rohre, Rahmen, Lamellen und Leitbleche usw. erforderlichen Verfahren bedingt sind. Das gilt im wesentlichen unabhängig davon, ob die verschiedenen Teile, insbesondere die Rohre und Lamellen, durch elastische Mittel miteinander verspannt werden oder durch Kleben, Schweißen, Löten, Clinchen oder sonstwie miteinander verbunden und/oder aus einzelnen Rohren oder aus sogenannten Mehrrohr- bzw. Mehrkammerprofilen zusammengesetzt sind (z. B. GB-PS 885 150, DE 30 27 900 A1, DE 195 05 641 A1, DE 197 19 258, DE 198 01 609 A1, DE 38 11 504 U1, DE 296 14 186 U1, DE 296 19 653 U1, EP 0 881 448 A2, US-PS 4 570 700).Entirely made of metal heat exchangers work properly in terms of the desired heat exchange. A disadvantage is their comparatively large production costs, on the one hand by the use of aluminum, on the other hand due to the necessary for connecting the pipes, frames, slats and baffles, etc. procedures. This is essentially independent of whether the various parts, in particular the tubes and fins are clamped together by elastic means or by gluing, welding, soldering, clinching or otherwise connected to each other and / or from individual tubes or from so-called multi-tube or Multi-chamber profiles are composed (eg GB-PS 885 150, DE 30 27 900 A1, DE 195 05 641 A1, DE 197 19 258, DE 198 01 609 A1, DE 38 11 504 U1, DE 296 14 186 U1, DE 296 19 653 U1, EP 0 881 448 A2, US Pat. No. 4,570,700).

Weiterhin sind Wärmeaustauscher mit durch elastische Verspannung gegen die Rohre gedrückten Wärmeleitelementen bekannt (GB-A-2 216 643), bei denen Ausnehmungen in den Wärmeleitelementen denselben Krümmungsradius wie die Rohre haben.Furthermore, heat exchangers with heat conduction elements pressed by elastic tension against the tubes are known (GB-A-2 216 643), in which recesses in the heat conducting elements have the same radius of curvature as the tubes.

Dagegen können komplett aus Kunststoff hergestellte Wärmeaustauscher vergleichsweise preisgünstig hergestellt werden (z. B. EP 0 044 561 A2, EP 0 429 953 B1, DE 198 38 525 A1, DE 198 53 526 A1). Bei derartigen Wärmeaustauschern stören jedoch die schlechten Wärmeleitungen der zu verwendenden Kunststoffe bzw. die dadurch bedingten mangelhaften Wärmeübergänge insbesondere auf der Kühlluftseite. Selbst übliche Mittel in Form von Stegen, Profilierungen, Lamellen od. dgl. in oder an den Kühlluftkanälen führen hier kaum zu den gewünschten Produkten aus Wärmeübergangszahl und Wärmeaustauschfläche. Das gilt auch dann, wenn anstelle von einzelnen Rohren Mehrrohr- bzw. Mehrkammerprofile angewendet werden (DE 39 29 004 A1).In contrast, heat exchangers made entirely of plastic can be produced comparatively inexpensively (eg EP 0 044 561 A2, EP 0 429 953 B1, DE 198 38 525 A1, DE 198 53 526 A1). In such heat exchangers, however, interfere with the poor heat conduction of the plastics to be used or the resulting lack of heat transfer, especially on the cooling air side. Even conventional means in the form of webs, profilings, fins od. Like. In or on the cooling air ducts lead here hardly to the desired products of heat transfer coefficient and heat exchange surface. This also applies if instead of individual tubes multi-tube or multi-chamber profiles are applied (DE 39 29 004 A1).

Daneben sind Wärmeaustauscher der eingangs bezeichneten Gattung bekannt geworden (US-A-3 489 209), die aus Kunststoff bestehende Rohre und aus Metall bestehende Lamellen aufweisen. Die Lamellen stehen hierbei nicht direkt mit den Rohren, sondern mit zusätzlichen Metallelementen in Berührung, die ihrerseits die Kunststoffrohre umgeben. Dadurch weist der Wärmeaustauscher zusätzliche Bauteile auf.In addition, heat exchangers of the type described are known (US-A-3 489 209), which consist of plastic existing pipes and metal lamellae. The slats are not directly with the pipes, but with additional metal elements in contact, which in turn surround the plastic pipes. As a result, the heat exchanger on additional components.

Entsprechendes gilt für bekannte Wärmeaustaustauscher mit spiralförmig gewickelten Rohren aus Kunststoff und Lamellen aus Metall (WO 99/46548 A), bei denen die zusätzlichen Teile aus zwischen den Lamellen angeordneten Blechstreifen bestehen.The same applies to known heat exchangers with spirally wound plastic pipes and metal fins (WO 99/46548 A), in which the additional parts consist of sheet metal strips arranged between the fins.

Weiterhin ist es in der Kältetechnik bekannt (DE 21 14 340 A1), flache oder flachovale Metallrohre und zwischen diesen angeordnete, ebenfalls aus Metall bestehende Lamellen unter Verformung der breiten Rohrseiten dadurch miteinander zu verbinden, daß das fertig gestapelte Wärmeaustauschernetz mit Hilfe von Zugankern zwischen zwei Außenplatten zusammengedrückt wird. Bei dieser Herstellungsart stören einerseits wie bei den anderen oben genannten, ausschließlich aus Metall hergestellten Wärmeaustauschern das große Gewicht und die vergleichsweise großen Material- und Herstellungskosten, andererseits die zur Verformung der Metallrohre erforderlichen hohen Kräfte. Außerdem müßten die Rohrenden, wenn die Rohre nicht, wie dort vorgeschlagen ist, schlangenlinienförmig verlegt, kreisförmig gebogen oder wendelförmig gewickelt werden sollen, zusätzlich durch Löten, Kleben oder dgl. mit zum Anschluß an Sammelkästen bestimmten Rahmen oder Bodenplatten oder dgl. verbunden werden, was die Herstellungskosten weiter erhöht.Furthermore, it is known in refrigeration technology (DE 21 14 340 A1), flat or flat-oval metal pipes and arranged between them, also made of metal lamellae with deformation of the broad sides of the tube together to connect that the finished stacked heat exchanger network by means of tie rods between two Outer plates is compressed. In this type of production, on the one hand, as in the case of the other abovementioned heat exchangers made exclusively of metal, the great weight and the comparatively high material and manufacturing costs are disturbing, and, on the other hand, the high forces required for the deformation of the metal pipes. In addition, the must Pipe ends, if the pipes are not, as proposed there, laid serpentine, circularly bent or helically wound to be additionally by soldering, gluing or the like. Connected to the connection to collection boxes frame or floor panels or the like., Which further increases the manufacturing cost elevated.

Schließlich sind Wärmeaustauscher bekannt, die Rahmen aus Kunststoff und Rohre aufweisen, die wahlweise aus Kunststoff oder Metall bestehen, wobei die Rahmen und Rohre durch eine einfache Steckverbindung miteinander verbunden werden können (DE 296 18 878 U1). Allerdings weisen derartige Wärmeaustauscher keine Mittel zur Vergrößerung des Wärmeübergangs auf, so daß sie nicht für alle und insbesondere nicht für die oben genannten Anwendungszwecke brauchbar sind.Finally, heat exchangers are known which have frames made of plastic and pipes, which optionally consist of plastic or metal, wherein the frame and tubes can be connected to each other by a simple plug connection (DE 296 18 878 U1). However, such heat exchangers have no means for increasing the heat transfer, so that they are not useful for all and especially not for the above-mentioned applications.

Der Erfindung liegt daher das technische Problem zugrunde, den Wärmeaustauscher der eingangs bezeichneten Gattung so auszubilden, daß er einerseits gute Wärmeleitungs- und Wärmeübertragungseigenschaften besitzt, andererseits aber dennoch preisgünstig und mit einem vergleichsweise geringen Gesamtgewicht hergestellt werden kann.The invention is therefore based on the technical problem of the heat exchanger of the type described initially in such a way that on the one hand has good heat transfer and heat transfer properties, on the other hand, however, can be produced inexpensively and with a relatively low overall weight.

Zur Lösung dieses Problems dienen die kennzeichnenden Merkmale des Anspruchs 1.To solve this problem serve the characterizing features of claim 1.

Die Erfindung beruht auf dem Gedanken, die Vorteile von Kunststoff- und Metallwerkstoffen zu kombinieren. Dabei werden erfindungsgemäß dort, wo z. B. aufgrund von Kondensationsvorgängen betriebsbedingt ein guter Wärmeübergang erzielt wird, übliche Kunststoffe wie z. B. Thermoplaste verwendet, während dort, wo die Wärmeleitung vergrößernde Mittel vorgesehen werden müssen, aus Metallen wie z. B. Aluminium hergestellte Lamellen, Leitbleche od. dgl. vorgesehen werden. Dabei werden die Mittel zur Erzielung guter Wärmeaustauscheigenschaften durch elastische Verspannung mit den Kunststoffrohren in Anlage gehalten, wodurch sich ein einfacher, kostengünstiger Zusammenbau der verschiedenen Teile erzielen läßt. Durch die Anwendung von Rohren und Rahmen aus Kunststoff wird außerdem der Vorteil erzielt, daß preisgünstige Verbindungsverfahren angewendet werden können, indem die Rohre und Rahmen z. B. durch Kunststoff-Schweißverfahren miteinander verbunden werden. Weitere vorteilhafte Merkmale der Erfindung ergeben sich aus den Unteransprüchen.The invention is based on the idea to combine the advantages of plastic and metal materials. According to the invention, where z. B. due to condensation processes due to the operation, a good heat transfer is achieved, conventional plastics such. As thermoplastics used, while where the heat conduction magnifying agent must be provided, made of metals such. B. aluminum-made slats, baffles od. Like. Be provided. The means for achieving good heat exchange properties are held by elastic tension with the plastic pipes in investment, which can be a simple, inexpensive assembly of the various parts can be achieved. Through the use of pipes and frames made of plastic also has the advantage that inexpensive connection methods can be applied by the pipes and frames z. B. are interconnected by plastic welding process. Further advantageous features of the invention will become apparent from the dependent claims.

Die Erfindung wird nachfolgend in Verbindung mit den beiliegenden Zeichnungen an Ausführungsbeispielen näher erläutert. Es zeigen:

  • Fig. 1 und 2 je eine schematische, perspektivische Darstellung und eine Vorderansicht von Teilen eines ersten Ausführungsbeispiels eines erfindungsgemäßen Wärmeaustauschers;
  • Fig. 3 einen Längsschnitt etwa längs der Linie III - III der Fig. 1 durch einen fertigen, aus den Teilen nach Fig. 1 und 2 und zugehörigen Rahmen zusammengesetzten Wärmeaustauscher;
  • Fig. 4 eine schematische, perspektivische Darstellung von Teilen eines zweiten Ausführungsbeispiels eines erfindungsgemäßen Wärmeaustauschers;
  • Fig. 5 eine teilweise geschnittene perspektivische Darstellung eines fertigen, aus den Teilen nach Fig. 4 zusammengesetzten Wärmeaustauschers;
  • Fig. 6 zwei Varianten einer Verschiebesicherung für Lamellen des Wärmeaustauschers nach Fig. 4 und 5;
  • Fig. 7 eine teilweise geschnittene Seitenansicht von Teilen eines dritten Ausführungsbeispiels eines erfindungsgemäßen Wärmeaustauschers;
  • Fig. 8 eine teilweise geschnittene perspektivische Darstellung eines fertigen, aus den Teilen nach Fig. 7 zusammengesetzten Wärmeaustauschers;
The invention will be explained in more detail below in connection with the accompanying drawings of exemplary embodiments. Show it:
  • Figures 1 and 2 are each a schematic, perspective view and a front view of parts of a first embodiment of a heat exchanger according to the invention.
  • Figure 3 is a longitudinal section approximately along the line III - III of Figure 1 through a finished, composed of the parts of Figures 1 and 2 and associated frame heat exchanger ..;
  • 4 is a schematic perspective view of parts of a second embodiment of a heat exchanger according to the invention;
  • Figure 5 is a partially cutaway perspective view of a finished, composed of the parts of Figure 4 heat exchanger.
  • Fig. 6 shows two variants of a displacement protection for slats of the heat exchanger of Fig. 4 and 5;
  • Fig. 7 is a partially sectioned side view of parts of a third embodiment of a heat exchanger according to the invention;
  • Fig. 8 is a partially cutaway perspective view of a finished, composed of the parts of Figure 7 heat exchanger.

Fig. 1 und 2 zeigen schematisch eine Vielzahl von als Einzelrohre ausgebildeten Rohren 1, die ovale Querschnitte aufweisen und in einer Mehrzahl von Ebenen parallel übereinander sowie in jeder Ebene in einer Mehrzahl von Spalten parallel nebeneinander angeordnet sind. Die Rohre 1 weisen breite Wandabschnitte 2 und schmale Wandabschnitte 3 auf und sind im Ausführungsbeispiel so angeordnet, daß innerhalb einer jeden Ebene jeweils ihre schmalen Wandabschnitte 3 einander gegenüber stehen, wohingegen in übereinander angeordneten Ebenen jeweils die breiten Wandabschnitte 2 einander zugewandt sind. Dabei sind die Rohre 1 in vorgewählten Abständen so angeordnet, daß zwischen ihnen Kanäle 4 (Fig. 1) vorhanden sind.1 and 2 schematically show a plurality of tubes 1 formed as individual tubes, which have oval cross-sections and in a plurality of planes parallel to each other and in each plane parallel to each other in a plurality of columns are arranged. The tubes 1 have wide wall sections 2 and narrow wall sections 3 and are arranged in the exemplary embodiment so that within each level their respective narrow wall sections 3 face each other, whereas in each case the broad wall sections 2 face each other in planes arranged one above the other. The tubes 1 are arranged at preselected intervals so that between them channels 4 (Fig. 1) are present.

Soll aus den Rohren 1 z. B. ein Wärmeaustauscher für einen Kondensations-Wärmeaustauscher hergestellt werden, dann dienen die Rohre 1 vorzugsweise als Strömungskanäle für feuchte, von einem Trockenraum kommende Prozeßluft, während die Kanäle 4 als senkrecht zu den Rohren 1 angeordnete Strömungskanäle für Kühlluft dienen und mit Wärmeleitelementen in Form von Lamellen 5 versehen sind, die z. B. aus mäanderförmig geformten, bei Wärmeaustauschern an sich bekannten Streifen bestehen und den Rohren 1 zugewandte, mit deren breiten Wandabschnitten 2 zur Anlage kommende Breitseiten 5a aufweisen. Die Lamellen 5 füllen die Kanäle 4 in einem mittleren Teil des Wärmeaustauschers vorzugsweise vollständig aus, während sie in den äußeren Abschnitten vorn und hinten jeweils freie Rohrenden 1a (Fig. 1) stehen lassen. Diese werden, wie Fig. 3 zeigt, bei der Montage des Wärmeaustauschers in Öffnungen 6 von Rahmen 7 gesteckt, die am vorderen bzw. hinteren Ende des Wärmeaustauschers angebracht werden und die Rohre 1 auf Abstand halten.Should from the tubes 1 z. B. a heat exchanger for a condensation heat exchanger are made, then the tubes 1 are preferably used as flow channels for moist, coming from a drying room process air, while the channels 4 are arranged as perpendicular to the tubes 1 flow channels for cooling air and with heat conducting elements in the form of Slats 5 are provided, the z. B. from meandering shaped, in heat exchangers known per se strips and the tubes 1 facing, with the wide wall sections 2 to the plant coming broad sides 5a have. The lamellae 5 preferably completely fill the channels 4 in a central part of the heat exchanger, while leaving free pipe ends 1a (FIG. 1) in front and behind in the outer sections. These are, as shown in FIG. 3, inserted in the assembly of the heat exchanger in openings 6 of frame 7, which are attached to the front and rear end of the heat exchanger and keep the tubes 1 at a distance.

Erfindungsgemäß bestehen die Rohre 1 und Rahmen 7 aus einem Kunststoff, z. B. einem Thermoplast in Form eines Polyolefins (PE, PP) oder Polyesters (PET, PBT oder ABS). Sie können daher je nach Bedarf z. B. durch Extrudieren, Blasformen, Spritzgießen od. dgl. kostengünstig hergestellt werden. Auch die Verbindung der Rohre 1 und der Rahmen 7 kann kostengünstig, d. h. ohne Anwendung von Klebern od. dgl. z. B. durch bekannte Kunststoff-Schweißverfahren wie Ultraschall-, Vibrations-, Reib- Thermokontakt-, Induktions-, Laser- oder Heizelement-Schweißen vorgenommen werden, wie in Fig. 3 durch geschwärzte Schweißstellen 8 angedeutet ist. Die Rohrenden 1a können zu diesem Zweck auch geringfügig aufgeweitet werden. Dagegen bestehen die Lamellen 5 erfindungsgemäß aus gut wärmeleitenden Metallen, und ihre Herstellung erfolgt z. B. dadurch, daß dünne Aluminiumstreifen mäanderförmig gefaltet werden.According to the invention, the tubes 1 and frame 7 made of a plastic, for. As a thermoplastic in the form of a polyolefin (PE, PP) or polyester (PET, PBT or ABS). You can therefore z. B. by extrusion, blow molding, injection molding od. Like. Are produced inexpensively. The connection of the tubes 1 and the frame 7 can cost, ie od without the use of adhesives. Like. B. by known plastic welding methods such as ultrasonic, vibration, friction thermal contact, induction, laser or heating element welding are made, as indicated in Fig. 3 by blackened welds 8. The pipe ends 1a can also be slightly widened for this purpose. In contrast, the lamellae 5 according to the invention consist of highly thermally conductive metals, and their preparation takes place for. B. in that thin aluminum strips are folded meandering.

Um zwischen den Kunststoff-Rohren 1 und den Metall-Lamellen 5 einerseits eine gute wärmeleitende und andererseits eine kostengünstig herstellbare Verbindung zu ermöglichen, werden die Rohre 1 und Lamellen 5 elastisch miteinander verspannt. Dies ist in Fig. 3 an einem Wärmeaustauscher gezeigt, dessen Rohre 1 zur Erleichterung der Darstellung in nur einer Ebene angeordnet sind und analog zu Fig. 1 und 2 zusammen mit je einer in Fig. 3 oben bzw. unten liegenden Lamelle 5 einen von den Rahmen 7 zusammengehaltenen Stapel bilden. Dieser Stapel wird von beiden Seiten her durch je ein Seitenteil 9 (bzw. eine Endplatte) verspannt, das mit seinen Enden formschlüssig in entsprechende Ausnehmungen 10 der Rahmen 7 ragt und dabei mit seiner oberen bzw. unteren Breitseite an einer ihr zugewandten Breitseite einer zugeordneten Lamelle 5 anliegt. Eine elastische Verspannung wird dabei dadurch erzielt, daß wenigstens ein Seitenteil 9 im entspannten Zustand aus einem plattenförmigen, jedoch vorgebogenen Blechteil besteht, dessen der Lamelle 5 zugewandte und mit dieser zur Anlage kommende Breitseite konvex gewölbt ist, wie in Fig. 3 schematisch durch ein strichpunktiert dargestelltes Seitenteil 9a angedeutet ist. Der Zusammenbau der verschiedenen Teile erfolgt z. B. dadurch, daß der aus den Rohren 1, den Lamellen 5 und den Seitenteilen 9a gebildete Stapel mit einer Presse od. dgl. so zusammengedrückt wird, daß die Seitenteile 9a aus der vorgebogenen Form in eine in Fig. 3 mit durchgezogenen Linien dargestellte, im wesentlichen planparallele Form 9 gebracht werden. Anschließend werden der vordere und der hintere Rahmen 7 aufgesteckt, wobei die Enden der jetzt als Blattfedern wirkenden Seitenteile 9 in die Ausnehmungen 10 eintreten und formschlüssig in diesen gehalten werden, während die Rohrenden 1a mit ausreichendem Spiel in die Öffnungen 6 eintreten, mit den Lamellen 5 in innige Berührung gelangen und dann mit den Rahmen 7 unter Bildung eines stabilen Wärmeaustauscherblocks flüssigkeits- bzw. gasdicht verschweißt werden. Dabei ist klar, daß die Seitenteile 9 vorzugsweise über die ganze Breite und Tiefe des Wärmeaustauscherblocks erstreckt sind und daher jeweils auf die gesamte Fläche der ihnen zugeordneten Breitseiten 5a der am weitesten außen liegenden Lamellen 5 einwirken. Die Lamellen 5 sind in Richtungen quer zu ihren Breitseiten vorzugsweise vergleichsweise biegesteif, um eine gleichförmige Kraftübertragung zu gewährleisten.In order to allow between the plastic pipes 1 and the metal fins 5 on the one hand a good heat conducting and on the other hand, a cost-producible connection, the tubes 1 and fins 5 are elastically clamped together. This is shown in Fig. 3 to a heat exchanger, the tubes 1 are arranged to facilitate the representation in only one plane and analogous to FIGS. 1 and 2 together with one in each case in Fig. 3 above or below slat 5 one of Frame 7 together held pile. This stack is braced from both sides by a respective side part 9 (or an end plate) which projects positively with its ends into corresponding recesses 10 of the frame 7 and thereby with its upper or lower broad side on a wide side facing it an associated lamella 5 is present. An elastic bracing is achieved in that at least one side part 9 in the relaxed state consists of a plate-shaped, but pre-bent sheet metal part, of which the lamella 5 facing and with this coming to rest broadside is convex, as shown in Fig. 3 schematically by a dot-dash line shown side part 9a is indicated. The assembly of the various parts takes place z. B. characterized in that the stack formed from the tubes 1, the fins 5 and the side parts 9a od with a press. Like. Is compressed so that the side parts 9a from the pre-bent shape in a in Fig. 3 shown by solid lines, be brought in substantially plane-parallel shape 9. Subsequently, the front and the rear frame 7 are attached, wherein the ends of the now acting as leaf springs side parts 9 enter the recesses 10 and are held in a form-fitting manner, while the pipe ends 1a with sufficient clearance in the openings 6, with the slats. 5 get into intimate contact and then liquid-tight or gas-tight welded to the frame 7 to form a stable heat exchanger block. It is clear that the side parts 9 are preferably extending over the entire width and depth of the heat exchanger block and therefore each act on the entire surface of their associated broad sides 5a of the outermost fins 5. The lamellae 5 are preferably comparatively rigid in directions transverse to their broad sides in order to ensure a uniform transmission of force.

Der erfindungsgemäße Wärmeaustauscher weist vorzugsweise ein zusätzliches Mittel zur Verbesserung des durch die elastische Verspannung bewirkten Wärmeübergangs bzw. wärmeleitenden Kontakts auf. Dieses Mittel enthält z. B. an die jeweilige Rohrform angepaßte Breitseiten 5a der Lamellen 5, wobei zweckmäßig zumindest diejenigen Breitseiten 5a angepaßt sind, die an den Rohren 1 anliegen. Im Ausführungsbeispiel bedeutet das, daß die Lamellen 5 quer zu den Rohren 1 eine variierende Dicke erhalten (Fig. 1 und 2), indem ihre Breitseiten 5a im Bereich der Rohre 1 mit über deren Länge erstreckten, konkaven Vertiefungen 5b versehen werden. Diese nehmen im Ausführungsbeispiel bei der Stapelbildung die breiten Wandabschnitte 2 der Rohre 1 auf und haben daher wie diese eine im wesentlichen ovale bzw. parabelförmige Kontur. Außerdem ist die Anordnung vorzugsweise so getroffen, daß die Krümmungsradien der Vertiefungen 5b etwas größer als die der Rohre 1 im Bereich der breiten Wandabschnitte 2 sind (Fig. 2, linke Hälfte). Werden die Lamellen 5 daher durch die Seitenteile 9 mit einer gewissen Vorspannung gegen die Rohre 1 gepreßt (Fig. 2, rechte Hälfte), dann werden diese dadurch in eine etwas flachere Form gedrückt und breitflächig in einen guten wärmeleitenden Kontakt mit den die Vertiefungen 5b bildenden Flächen der Lamellen 5 gebracht, wie aus einem Vergleich der linken und rechten Hälfte der Fig. 2 klar erkennbar ist. Dabei ist klar, daß die Abstände von einander zugewandten Breitseiten 5a der Lamellen 5 größer als die quer zu den Breitseiten 2 gemessene Dicke der Rohre 1 sein sollte, damit eine ausreichend große elastische Anpreßkraft ausgeübt werden kann.The heat exchanger according to the invention preferably has an additional means for improving the heat transfer or heat-conducting contact brought about by the elastic tensioning. This agent contains z. B. to the respective pipe shape adapted broad sides 5a of the slats 5, wherein expediently at least those broad sides 5a are adapted, which abut the tubes 1. In the embodiment, this means that the slats 5 transversely to the tubes 1 a varying thickness obtained (Fig. 1 and 2) by their broad sides 5a in the region of the tubes 1 with over its length extending, concave recesses 5b are provided. These take in the embodiment in stacking the wide wall sections 2 of the tubes 1 and therefore have like this a substantially oval or parabolic contour. In addition, the arrangement is preferably such that the radii of curvature of the recesses 5b are slightly larger than those of the tubes 1 in the region of the wide wall sections 2 (Fig. 2, left half). If the lamellae 5 are therefore pressed against the tubes 1 by the side parts 9 with a certain prestress (FIG. 2, right half), then they are pressed into a somewhat flatter shape and broadly formed into a good heat-conducting contact with the depressions 5b Placed surfaces of the slats 5, as clearly seen from a comparison of the left and right half of Fig. 2. It is clear that the distances from each other facing broad sides 5a of the slats 5 should be greater than the measured transverse to the broad sides 2 thickness of the tubes 1, so that a sufficiently large elastic contact pressure can be exerted.

Die Vertiefungen 5b haben, wie insbesondere Fig. 1 zeigt, im montierten Zustand weiterhin die Wirkung einer Verschiebesicherung der Lamellen 5 gegen Verschiebungen quer zu den Rohrachsen, wodurch auch bei dünnen Wandstärken der verschiedenen Teile eine insgesamt stabile Blockbildung erreicht wird. Alternativ oder zusätzlich können die Rohre 1 zu diesem Zweck mit unterschiedlichen Wanddicken versehen werden. Außerdem können die Rohraußenwände und/oder die zugewandten Breitseiten 5a der Lamellen 5 zur Verbesserung des Wärmeübergangs mit einer Wärmeleitpaste belegt werden.The recesses 5b have, as shown in particular Fig. 1, in the assembled state continue the effect of a displacement assurance of the slats 5 against displacements transverse to the tube axes, whereby a total stable block formation is achieved even with thin wall thicknesses of the various parts. Alternatively or additionally, the tubes 1 can be provided with different wall thicknesses for this purpose. In addition, the tube outer walls and / or the facing broad sides 5a of the lamellae 5 can be covered with a thermal compound to improve the heat transfer.

Besteht der Block abweichend von Fig. 3 aus in mehreren Ebenen angeordneten Rohren 1, dann sind jeweils beide entgegengesetzte Breitseiten 5a der Lamellen 5 mit den Vertiefungen 5b versehen. Dabei versteht sich, daß diese im Ausführungsbeispiel wie die Breitseiten 5a nicht kontinuierlich durchgehend sind (Fig. 1), sondern aus den an sie grenzenden Abschnitten der mäanderförmigen Aluminiumstreifen gebildet werden.If the block deviating from Fig. 3 arranged in several levels tubes 1, then both opposite broad sides 5a of the slats 5 are provided with the recesses 5b. It is understood that in the embodiment, such as the broad sides 5a are not continuously continuous (Fig. 1), but from the adjoining them sections of the meandering aluminum strips are formed.

Bei der Anwendung einzelner Rohre 1 sind die mit den Rahmen 7 nach Fig. 3 erzielbaren Packungsdichten nicht optimal. Einerseits haben die Rundungen an den Schmalseiten der Rohre 1 zwangsläufig Toträume zur Folge, anderseits kann der Abstand der Rohre 1 in den Rahmen 7 nicht beliebig klein sein, da ausreichend Platz für den Abdicht- bzw. Schweißvorgang zur Verfügung stehen muß. Gemäß einem besonders bevorzugten Ausführungsbespiel der Erfindung (Fig. 4 bis 6) ist daher anstelle der Einzelrohre 1 wenigstens ein vorzugsweise einstückig hergestelltes Mehrrohr- bzw. Mehrkammerprofil 14 vorgesehen, das als Ganzes eine Ebene des Wärmeaustauscherblocks bildet. Das Mehrkammerprofil 14 enthält eine Mehrzahl von parallel und ohne Toträume nebeneinander liegenden Rohren 15, die in Fig. 4 oben und unten durch breite Seitenwände 16 und rechts und links durch schmale Stege 17 begrenzt sind und jeweils eine in sich abgeschlossene Kammer bzw. einen Kanal bilden. Je zwei benachbarte Rohre 15 haben dabei einen zwischen ihnen angeordneten Steg 17 gemeinsam. Die breiten, zwischen je zwei Stegen angeordneten Wandabschnitte 16 sind analog zu den Rohren 1 (Fig. 1) oval bzw. konvex nach außen gewölbt. Sind mehr Rohre 15 erforderlich, als den Kammern eines Mehrkammerprofils 14 entspricht, werden mehrere Mehrkammerprofile 14 nebeneinander oder entsprechend Fig. 5 und 6 in mehreren Ebenen übereinander angeordnet. Die Mehrkammerprofile 14 bestehen erfindungsgemäß aus Kunststoff und können kostengünstig z. B. durch Extrudieren hergestellt werden.When using individual tubes 1 which are achievable with the frame 7 of FIG Packing densities are not optimal. On the one hand, the curves on the narrow sides of the tubes 1 inevitably result in dead spaces, on the other hand, the distance between the tubes 1 in the frame 7 can not be arbitrarily small, since sufficient space for the sealing or welding process must be available. According to a particularly preferred exemplary embodiment of the invention (FIGS. 4 to 6), therefore, instead of the individual tubes 1, at least one multi-tube profile 14, preferably made in one piece, is provided, which as a whole forms a plane of the heat exchanger block. The multi-chamber profile 14 includes a plurality of parallel and without dead spaces adjacent tubes 15 which are limited in Fig. 4 above and below by wide side walls 16 and right and left by narrow webs 17 and each form a self-contained chamber or a channel , Each two adjacent tubes 15 have a web 17 arranged between them in common. The wide, between two webs arranged wall portions 16 are curved analogous to the tubes 1 (Fig. 1) oval or convex to the outside. If more tubes 15 are required than correspond to the chambers of a multi-chamber profile 14, a plurality of multi-chamber profiles 14 are arranged next to one another or according to FIGS. 5 and 6 in several planes one above the other. The multi-chamber profiles 14 consist according to the invention of plastic and can cost z. B. be prepared by extrusion.

In weiterer Analogie zu Fig. 1 und 3 sind zwischen den einzelnen Mehrkammerprofilen 14 bzw. auf ihren beiden die breiten Wandabschnitte 16 bildenden Seiten jeweils aus Metall bestehende Lamellen 18 angeordnet, die z. B. wie die Lamellen 5 nach Fig. 1 bis 3 aus mäanderförmig gefalteten Aluminiumstreifen hergestellt sind, aber quer zu den Achsen der Rohre 15 eine durchgehend konstante Dicke nach Art einer planparallen Platte aufweisen. Außerdem sind die Mehrkammerprofile 15 an von den Lamellen 18 freigelassenen Enden 14a (Fig. 4) in Kunststoff-Rahmen 19 (Fig. 5) gehalten, die den Rahmen 7 nach Fig. 3 bis auf den Unterschied gleichen, daß sie Öffnungen 20 mit einer der Breite der Mehrkammerprofile 14 entsprechenden Länge aufweisen.In a further analogy to FIGS. 1 and 3, lamellas 18 each consisting of metal are arranged between the individual multi-chamber profiles 14 or on their two sides forming the wide wall sections 16; Example, as the slats 5 are made according to Fig. 1 to 3 of meandering folded aluminum strip, but transverse to the axes of the tubes 15 have a constant thickness throughout the manner of a plane-parallel plate. In addition, the multi-chamber profiles 15 are held on the lamellae 18 free ends 14 a (Fig. 4) in plastic frame 19 (Fig. 5), which the frame 7 of FIG. 3 except for the difference that they have openings 20 with a the width of the multi-chamber profiles 14 have corresponding length.

Wie Fig. 5 zeigt, wird ein aus wenigstens einem Mehrkammerprofil 14 und einer zugehörigen Lamelle gebildeter Stapel an der Ober- und ggf. auch Unterseite durch je ein Seitenteil 21 elastisch zu einem stabilen Wärmeaustauscherblock verspannt. Wenigstens eines der Seitenteile 21 ist zu diesem Zweck wie das Seitenteil 9a nach Fig. 3 im entspannten Zustand konvex vorgebogen, im montierten Zustand dagegen mit seinen Enden nach Art einer Blattfeder zu einer im wesentlichen planparallelen Platte geformt, indem seine Enden formschlüssig in entsprechenden Ausnehmungen 22 der Rahmen 19 aufgenommen sind. Im übrigen erstrecken sich die Seitenteile 21 zwischen den Rahmen 19 über die ganze Breite und Tiefe des Wärmeaustauschers (Fig. 5).As shown in FIG. 5, a stack formed from at least one multi-chamber profile 14 and an associated lamella is braced elastically to form a stable heat exchanger block on the upper side and possibly also on the lower side by a respective side part 21. At least one of the side parts 21 is for this purpose as the side part 9a of FIG. 3 in the relaxed Condition convexly pre-bent, in the assembled state, however, formed with its ends in the manner of a leaf spring to a substantially plane-parallel plate by its ends are positively received in corresponding recesses 22 of the frame 19. Incidentally, the side parts 21 extend between the frames 19 over the entire width and depth of the heat exchanger (Fig. 5).

Bei der Anwendung des Wärmeaustauschers nach Fig. 4 und 5 auf Wäschetrockner strömt die Prozeßluft z. B. in Richtung eines Pfeils PL durch die Rohre 15, die Kühlluft dagegen in Richtung eines Pfeils KL durch die Lamellen 18.When using the heat exchanger according to FIGS. 4 and 5 on a tumble dryer, the process air flows z. B. in the direction of an arrow PL through the tubes 15, the cooling air, however, in the direction of an arrow KL through the slats 18th

Ein Mittel zur Verbesserung des Wärmeübergangs bzw. wärmeleitenden Kontakts besteht bei diesem Ausführungsbeispiel darin, daß jedes Mehrkammerprofil 14 eine Mehrzahl von nebeneinander angeordneten Rohren 15 enthält, wobei die konvexe Wölbung der einzelnen Breitseiten bzw. Wandabschnitte 16 so gewählt ist, daß diese bei der Montage aufgrund des elastischen Drucks in eine im wesentlichen ebene Form gedrückt werden (Fig. 6), wodurch sich eine innige Anlage zwischen den breiten Wandabschnitten 16 und den Breitseiten der Lamellen 18 und ein guter Wärmeübergang zwischen der Prozeßluftseite (Rohre 15) und der Kühlluftseite (Lamellen 18) ergeben. Wegen der geringen Breite, die jedem einzelnen Rohrabschnitt 15 ohne wesentliche Beeinträchtigung der gewünschten Funktion gegeben werden kann, besteht dabei nicht die Gefahr, daß sich die Breitseiten beim Andrücken der Lamellen 18 konkav durchbiegen, wie dies bei Anwendung eines einzelnen Rohrs 1 von der Größe eines Mehrkammerprofils 14 zwangsläufig der Fall wäre.A means for improving the heat transfer or heat-conducting contact in this embodiment is that each multi-chamber profile 14 includes a plurality of juxtaposed tubes 15, wherein the convex curvature of the individual broadside or wall sections 16 is selected so that it due to assembly 6), whereby an intimate contact between the wide wall sections 16 and the broad sides of the fins 18 and a good heat transfer between the process air side (tubes 15) and the cooling air side (fins 18 ). Because of the small width that can be given to each pipe section 15 without significant impairment of the desired function, there is no risk that the broad sides when pressing the fins 18 concave bend, as in the application of a single tube 1 on the size of a Multi-chamber profile 14 would inevitably be the case.

Die Montage des Wärmeaustauschers nach Fig. 4 und 5 erfolgt analog zu der nach Fig. 1 bis 3. Die Verbindung der Mehrkammerprofile 14 und der Rahmen 19 erfolgt dabei wie in Fig. 1 bis 3 zweckmäßig durch Schweißen.The assembly of the heat exchanger of Fig. 4 and 5 is analogous to that of FIG. 1 to 3. The compound of the multi-chamber profiles 14 and the frame 19 is effected as shown in Fig. 1 to 3 expediently by welding.

Um zu vermeiden, daß sich die Lamellen 18 bei oder nach der Montage ungewollt quer zu den Rohren 15 verschieben, sind erfindungsgemäß zusätzlich Verschiebesicherungen vorgesehen. Zu diesem Zweck weisen die Mehrkammerprofile 14 an ihren in Fig. 4 und 5 rechten und linken Seitenflächen z. B. je einen ihre Höhe überragenden Haltesteg 23 auf, wie im linken Teil der Fig. 6 angedeutet ist. Diese Haltestege 23 legen sich im montierten Zustand von außen an die zwischen den Mehrkammerprofilen 14 liegenden Lamellen 18 an und verhindern dadurch deren seitliche Verschiebung. Alternativ können, wie im rechten Teil der Fig. 6 dargestellt ist, die rechten und linken Seitenflächen der Lamellen 18 mit ihre Höhe überragenden Haltestegen 24 versehen sein, die sich im montierten Zustand von außen an die zwischen den Lamellen 18 liegenden Mehrkammerprofile 14 anlegen und dadurch seitliche Verschiebungen der Lamellen 18 verhindern.In order to avoid that the slats 18 move unintentionally transversely to the tubes 15 during or after assembly, sliding safety devices are additionally provided according to the invention. For this purpose, the multi-chamber profiles 14 at their in Fig. 4 and 5 right and left side surfaces z. B. depending on their height superior holding web 23, as indicated in the left part of Fig. 6. These retaining webs 23 lie in the assembled Condition from the outside to lie between the multi-chamber profiles 14 slats 18 and thereby prevent their lateral displacement. Alternatively, as shown in the right-hand part of FIG. 6, the right and left side surfaces of the lamellae 18 may be provided with retaining webs 24 projecting beyond their height, which in the installed state bear against the multichamber profiles 14 lying between the lamellae 18 from outside and thereby prevent lateral displacements of the fins 18.

Im übrigen gilt für den Wärmeaustauscher nach Fig. 4 bis 6 dasselbe wie für den Wärmeaustauscher nach Fig. 1 bis 3.Otherwise, the same applies to the heat exchanger according to FIGS. 4 to 6 as for the heat exchanger according to FIGS. 1 to 3.

Das Ausführungsbeispiel nach Fig. 7 und 8 zeichnet sich gegenüber denen nach Fig. 1 bis 6 dadurch aus, daß erste und zweite Rohre 26, 27 in Form von Mehrkammerprofilen und erste und zweite Rahmen 28, 29 jeweils Baueinheiten bilden, die aus einstückig hergestellten Kunststoff-Spritzgußteilen bestehen. Zur Vereinfachung der Herstellung wird der Wärmeaustauscher dabei aus drei Teilen zusammengesetzt, nämlich dem ersten, z. B. vorderen Rahmen 28 und den daran befestigten ersten Rohren 26, dem zweiten, z. B. hinteren Rahmen 29 und den daran befestigten zweiten Rohren 27 sowie zwischen den Rohren 26, 27 anzuordnenden, hier wellenförmig oder auch entsprechend Fig. 4 bis 6 ausgebildeten Lamellen 30 mit durchgehend gleicher Dicke. Dabei stehen im Ausführungsbeispiel die Rohre 26 des vorderen Rahmens 28 senkrecht nach hinten und die Rohre 27 des hinteren Rahmens 29 jeweils senkrecht nach vorn ab, wobei sie jeweils koaxial auf Durchgänge 31 ausgerichtet sind, die die Rahmen 28, 29 durchsetzen, um die Rohre 26, 27 analog zu Fig. 3 und 5 mit an den Außenseiten der Rahmen 28, 29 anzuordnenden Sammelkästen od. dgl. verbinden zu können.The embodiment of FIGS. 7 and 8 is distinguished from those of FIGS. 1 to 6, characterized in that first and second tubes 26, 27 in the form of multi-chamber profiles and first and second frames 28, 29 each form units that are made of one piece plastic Consist of injection molded parts. To simplify the production of the heat exchanger is composed of three parts, namely the first, z. B. front frame 28 and attached thereto first tubes 26, the second, z. B. rear frame 29 and attached thereto second tubes 27 and between the tubes 26, 27 to be arranged, here wave-shaped or also according to FIG. 4 to 6 formed slats 30 with the same thickness. In this case, in the exemplary embodiment, the tubes 26 of the front frame 28 are perpendicular to the rear and the tubes 27 of the rear frame 29 each perpendicular to the front, wherein they are each coaxially aligned with passages 31 which pass through the frames 28, 29 to the tubes 26th , 27 analogous to FIG. 3 and 5 od to be arranged on the outer sides of the frame 28, 29 collecting boxes. Like. To connect.

Bei der Darstellung nach Fig. 7 und 8 sind die ersten und zweiten Rohre 26 und 27 abwechselnd in unterschiedlichen Ebenen angeordnet, wobei in Fig. 7 der Rahmen 28 drei erste und der Rahmen 29 zwei zweite Rohrebenen bildet und jeweils eine Ebene von Rohren 27 zwischen zwei Ebenen von Rohren 26 angeordnet ist. Alternativ wäre es aber auch möglich, die Rohre 26, 27 so an den Rahmen 28, 29 zu befestigen, daß in jeder Ebene sowohl erste Rohre 26 des einen Rahmens 28 als auch zweite Rohre 27 des anderen Rahmens angeordnet sind.In the illustration according to FIGS. 7 and 8, the first and second tubes 26 and 27 are arranged alternately in different planes, wherein in FIG. 7 the frame 28 forms three first and the frame 29 two second tube planes and in each case a plane of tubes 27 between two levels of tubes 26 is arranged. Alternatively, it would also be possible to attach the tubes 26, 27 to the frame 28, 29, that in each plane both first tubes 26 of a frame 28 and second tubes 27 of the other frame are arranged.

Wie insbesondere Fig. 7 zeigt, weisen die Rohre 26 und 27 sich verjüngende Querschnitte auf, die im Bereich der zugehörigen Rahmen 28, 29 am größten sind und in Richtung ihrer freien Enden allmählich abnehmen. Dies erleichtert unter anderem die Entformung der Baueinheiten 26, 28 bzw. 27, 29 bei ihrer Herstellung durch Spritzgießen aus Kunststoff.As particularly shown in Fig. 7, the tubes 26 and 27 have tapered cross-sections, which are largest in the region of the associated frames 28, 29 and gradually decrease in the direction of their free ends. This facilitates, inter alia, the demolding of the units 26, 28 and 27, 29 in their production by injection molding of plastic.

Zwischen den Durchgängen 31 weisen die Rahmen 28, 29 weitere Durchgänge 32 auf. Diese sind so bemessen und so geformt, daß sie die freien Enden derjenigen Rohre 26, 27 in sich aufnehmen können, die am jeweils anderen Rahmen 28, 29 befestigt sind. Werden daher die beiden aus dem Rahmen 28 und den Rohren 26 bzw. aus dem Rahmen 29 und den Rohren 27 bestehenden, jeweils einstückig hergestellten Baueinheiten in der aus Fig. 7 ersichtlichen Weise in Richtung von Pfeilen v, w aufeinander zu bewegt, bis die freien Enden der Rohre 26, 27 jeweils in die zugehörigen Durchgänge 32 der Rahmen 28, 29 eintreten, wird dadurch analog zu Fig. 1 bis 3 ein Block erhalten, bei dem die freien Enden der Einzelrohre 26, 27 und die Rahmen 28, 29 vorzugsweise durch Schweißen miteinander verbunden werden können.Between the passages 31, the frames 28, 29 have further passages 32. These are sized and shaped so that they can accommodate the free ends of those tubes 26, 27 in themselves, which are fastened to the respective other frame 28, 29. Therefore, the two consisting of the frame 28 and the tubes 26 and from the frame 29 and the tubes 27, each integrally manufactured units in the manner shown in Fig. 7 in the direction of arrows v , w are moved toward each other until the free Ends of the tubes 26, 27 respectively enter into the associated passages 32 of the frame 28, 29, thereby obtained analogous to Fig. 1 to 3, a block in which the free ends of the individual tubes 26, 27 and the frames 28, 29 preferably by Welding can be connected with each other.

Die Querschnittsverjüngungen der Rohre 26, 27 sind vorzugsweise durchweg gleichförmig. Dadurch ergeben sich nach dem Zusammenfügen der beiden Baueinheiten zwischen den Rohren 26, 27 Kanäle mit durchgehend im wesentlichen konstanter Höhe, was die Anordnung und gleichmäßige Anlage von Lamellen 30 mit durchgehend gleicher Dicke ermöglicht und erleichtert. Im übrigen ist klar, daß die Durchgänge 31, 32 nach Art eines Rasters so in den Rahmen 28, 29 verteilt angeordnet sind, wie es der Anordnung der an den Rahmen 28, 29 befestigten Rohre entspricht.The cross-sectional tapers of the tubes 26, 27 are preferably uniform throughout. This results in the joining of the two units between the tubes 26, 27 channels with continuously substantially constant height, which allows the arrangement and uniform contact of fins 30 with the same thickness throughout and facilitates. Moreover, it is clear that the passages 31, 32 arranged in the manner of a grid distributed in the frame 28, 29, as it corresponds to the arrangement of the frame 28, 29 fixed pipes.

Als Mittel zur Verbesserung des Wärmeübergangs ist bei diesem Ausführungsbeispiel vorzugsweise eine solche Bemessung der Querschnittsverjüngungen der Rohre 26, 27 vorgesehen, daß beim Annähern der Rahmen 28, 29 in Richtung der Pfeile v und w die zuvor eingelegten Lamellen 30 analog zu den Ausführungsbeispielen nach Fig. 1 bis 6 quer zu den Rohren 26, 27 elastisch vorgespannt und dadurch mit diesen in einen guten wärmeleitenden Kontakt gebracht werden. Alternativ und zusätzlich könnte das Mittel darin bestehen, die Rohre 26, 27 analog zu Fig. 1 bis 6 mit trapezförmigen bzw. ovalen Querschnitten zu versehen, um ihre breiten Wandabschnitte zusätzlich elastisch zu verformen und/oder vorgebogene Seitenteile 33 vorzusehen, die formschlüssig in Ausnehmungen 34 der Rahmen 28, 29 gesteckt werden und den gesamten Block elastisch verspannen. Weiterhin kann vorgesehen sein, die Seitenteile 33 nur als übliche Endplatten und ggf. zur Verspannung der beiden äußersten Lamellen (z. B. 30a in Fig. 7) zu verwenden, die übrigen Lamellen 30 dagegen allein über die konische oder sonstige Form der Rohre 26, 27 mit diesen zu verspannen. Schließlich ist es möglich, die Mehrkammerprofile bzw. Rohre 26, 27 analog zu Fig. 1 bis 3 durch Einzelrohre zu ersetzen.As a means for improving the heat transfer in this embodiment preferably such a dimensioning of the cross-sectional tapers of the tubes 26, 27 is provided that when approaching the frame 28, 29 in the direction of arrows v and w previously inserted slats 30 analogous to the embodiments of FIG. 1 to 6 transverse to the tubes 26, 27 elastically biased and thereby brought into a good heat-conducting contact with these. Alternatively and additionally, the means could be to provide the tubes 26, 27 analogous to FIG. 1 to 6 with trapezoidal or oval cross-sections, in addition to their wide wall sections elastically deform and / or provide pre-bent side portions 33 which are positively inserted into recesses 34 of the frame 28, 29 and elastically clamp the entire block. Furthermore, provision can be made for the side parts 33 to be used only as standard end plates and, if necessary, for tensioning the two outermost plates (eg 30a in Fig. 7), while the remaining plates 30 are used solely via the conical or other shape of the tubes 26 27 to tense with these. Finally, it is possible to replace the multi-chamber profiles or tubes 26, 27 analogous to FIGS. 1 to 3 by individual tubes.

Im übrigen gilt für das Ausführungsbeispiel nach Fig. 7 und 8 dasselbe wie für die Ausführungsbeispiele nach den Fig. 1 bis 6, wobei insbesondere zusätzliche Verschiebesicherungen vorgesehen werden können.For the rest, the same applies to the embodiment of FIGS. 7 and 8 as for the embodiments according to FIGS. 1 to 6, in particular additional displacement fuses can be provided.

Die Erfindung bringt den Vorteil mit sich, daß auf der Seite der Rohre (z. B. Prozeßluftseite) glatte und damit gegen Verschmutzungen unempfindliche Flächen, auf der Seite der Lamellen bzw. Leitbleche (z. B. Kühlluftseite) dagegen große Wärmeaustauschflächen mit hoher Wärmeleitung in den einzelnen Flächenabschnitten erhalten werden, wie es z. B. bei der Anwendung der beschriebenen Wärmeaustauscher in Wäschetrockern erwünscht ist.The invention has the advantage that on the side of the tubes (eg process air side) smooth and thus insensitive surfaces, on the side of the fins or baffles (eg cooling air side), however, large heat exchange surfaces with high heat conductivity are obtained in the individual surface sections, as z. B. in the application of heat exchanger described in tumble dryers is desired.

Die Erfindung ist nicht auf die beschriebenen Ausführungsbeispiele beschränkt, die auf vielfache Weise abgewandelt werden können. Das gilt z. B. für die im Einzelfall verwendeten Rohrformen, da die Rohre insbesondere mit anderen als den dargestellten Wölbungen und Querschnitten versehen werden können. Weiter können die Rohre bei Bedarf innen mit an sich bekannten, ihre Oberflächen vergrößernden Stegen od. dgl. versehen sein, die zwar im Hinblick auf ihre Wärmeleitung wenig nützen, ihnen aber eine erhöhte Stabilität verleihen können. Auch ist die Kombination von Einzelrohren und Mehrkammerrohren innerhalb eines und derselben Wärmeaustauschers möglich. Ferner hängen die Zahl der verwendeten Rohre und Lamellen bzw. Leitbleche und die Zahl der pro Wärmeaustauscher vorgesehenen Rohrebenen ganz von den Bedürfnissen des Einzelfalls ab. Anstelle der dargestellten, mäanderförmigen (rechteckigen) Lamellen können wellenförmige (abgerundete), dreieckförmige und andere Lamellen sowie Mischformen davon verwendet werden. Außerdem können die beschriebenen Wärmeaustauscher mit anderen als den dargestellten Verschiebesicherungen versehen werden und zusätzlich nicht dargestellte Abtropfkanten, Sammelrinnen od. dgl. für abtropfendes Kondenswasser aufweisen. Schließlich versteht sich, daß die verschiedenen Merkmale auch in anderen als den dargestellten und beschriebenen Kombinationen angewendet werden können.The invention is not limited to the described embodiments, which can be modified in many ways. This applies z. B. for the tube shapes used in the individual case, since the tubes can be provided in particular with other than the buckling and cross sections shown. Further, if necessary, the pipes can be internally provided with webs which are known per se and enlarge their surfaces, or the like, which, although they are of little use in terms of their heat conduction, can give them increased stability. Also, the combination of single tubes and multi-chamber tubes within one and the same heat exchanger is possible. Furthermore, the number of tubes and fins used and the number of tube levels provided per heat exchanger depend entirely on the needs of the individual case. Instead of the illustrated, meandering (rectangular) lamellas wavy (rounded), triangular and other lamellae and mixed forms thereof can be used. In addition, the described heat exchangers can be provided with other than the illustrated anti-slip devices and additionally drip edges, not shown, collecting grooves od. Like. Have for dripping condensate. Finally, it should be understood that the various features may be applied in combinations other than those illustrated and described.

Claims (13)

  1. Heat exchanger, in particular for condensation laundry driers, having a multiplicity of pipes (1) which are attached at their ends and sealed in openings (6) of frames (7) and having a multiplicity of channels (4) which are disposed between the pipes (1) and in which lamellae (5), which serve for heat conduction and comprise folded metal strips, are disposed, the frames (7) and pipes (1) comprising plastic material and the pipes (1) and the lamellae (5) being restrained together elastically, characterised in that the lamellae (5) are retained in abutment with the pipes (1) by means of the elastic restraint, and a means is provided for improving the consequently effected heat transfer between the pipes (1) and the lamellae (5), the pipes (1) comprising individual pipes which have oval cross-sections and also narrow and broad wall portions (2, 3), the lamellae (5) having broad sides (5a) which come to abut on the broad sides (2) of the pipes (1) and the means containing recesses (5b) which are adapted to the shape of the pipe, are configured in the broad sides (5a) of the lamellae (5) and are provided with radii of curvature which are greater than the broad sides (2) of the pipes (1) in the non-assembled state.
  2. Heat exchanger according to claim 1, characterised in that lamellae (5), which are stacked one above the other, and pipes (1), which are disposed between the broad sides (5a) thereof, form a stack which is elastically restrained by two side parts (9, 9a) which are disposed on oppositely situated sides.
  3. Heat exchanger, in particular for condensation laundry driers, having a multiplicity of pipes (15) which are attached at their ends and sealed in openings (20) of frames (19) and having a multiplicity of channels which are disposed between the pipes (15) and in which lamellae (18), which serve for heat conduction and comprise folded metal strips, are disposed, the frames (19) and pipes (15) comprising plastic material and the pipes (15) and the lamellae being restrained together elastically, characterised in that the lamellae (18) are retained in abutment with the pipes (15) by means of the elastic restraint, and a means is provided for improving the consequently effected heat transfer between the pipes (15) and the lamellae (18), the pipes (15) being formed by multiple chamber profiles (14) which have a plurality of adjacently situated, parallel chambers, the lamellae (18) being provided with a substantially constant thickness and the means containing wall portions (16) of the pipes (15) which are curved outwardly and orientated towards the lamellae (18).
  4. Heat exchanger according to claim 3, characterised in that a plurality of lamellae (18) which are stacked alternately one above the other and multiple chamber profiles (14) which are disposed therebetween form a stack and the stack is elastically restrained by means of two side parts (21) which are disposed on oppositely situated ends.
  5. Heat exchanger according to one of the claims 2 or 4, characterised in that the side parts (9, 9a, 21) comprise pre-bent plates which are retained in the frames (7, 19) by form-fitting.
  6. Heat exchanger, in particular for condensation laundry driers, having a multiplicity of pipes (26, 27) which are attached at their ends and sealed in openings (32) of frames (28, 29) and having a multiplicity of channels which are disposed between the pipes (26, 27) and in which lamellae (30), which serve for heat conduction and comprise folded metal strips, are disposed, the frames (28, 29) and pipes (26, 27) comprising plastic material and the pipes (26, 27) and the lamellae (30) being restrained together elastically, characterised in that the lamellae (30) are retained in abutment with the pipes (26, 27) by means of the elastic restraint, and a means is provided for improving the consequently effected heat transfer between the pipes (26, 27) and the lamellae (30), two frames (28, 29) being provided which are situated opposite each other and on which respectively the pipes (26, 27) which form the one ends of first or second, different pipe planes are attached, each frame (28, 29) having passages (32) for receiving free ends of the pipes (26, 27) which are attached respectively to the other frame (28, 29) and lamellae (30) with a substantially constant thickness being disposed between the pipe planes, and in that the means comprises cross-sections of the first and second pipes (26, 27) which taper in opposite directions away from the frames (28, 29).
  7. Heat exchanger according to claim 6, characterised in that the elastic restraint of the lamellae (30) is effected by arrangement and attachment of the free ends of the pipes (26, 27) in the passages (32) of the frames (28, 29).
  8. Heat exchanger according to claim 6 or 7, characterised in that the pipes (26, 27) comprise individual pipes or multiple chamber profiles.
  9. Heat exchanger according to one of the claims 6 to 8, characterised in that the pipes (26, 27) and the frames (28, 29) are assembled into two plastic material injection moulded parts which are produced in one piece.
  10. Heat exchanger according to one of the claims 1 to 9, characterised in that the pipes (1, 15, 26, 27) are connected to the frames (7, 19, 28, 29) by means of welding.
  11. Heat exchanger according to one of the claims 1 to 10, characterised in that it has displacement security means (5b, 23, 24) which prevent displacements between the pipes (1, 15) and lamellae (5, 18).
  12. Heat exchanger according to claim 11, characterised in that the displacement security means (23, 24) comprise retaining webs which are provided on the multiple chamber profiles (14) or lamellae (18).
  13. Heat exchanger according to one of the claims 1 to 12, characterised in that the lamellae (5, 18, 30) are produced in aluminium.
EP01125856A 2000-11-01 2001-10-30 Heat exchanger, in particular condensation laundry drier Expired - Lifetime EP1203923B1 (en)

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DE20018679U 2000-11-01

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EP1203923A3 EP1203923A3 (en) 2003-08-13
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Publication number Publication date
EP1203923A3 (en) 2003-08-13
DE50110536D1 (en) 2006-09-07
EP1203923A2 (en) 2002-05-08
ATE334373T1 (en) 2006-08-15

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