EP0414696B1 - Kern zur anwendung in feuchte- und wärmetauschern und verfahren zur herstellung - Google Patents

Kern zur anwendung in feuchte- und wärmetauschern und verfahren zur herstellung Download PDF

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Publication number
EP0414696B1
EP0414696B1 EP19890903849 EP89903849A EP0414696B1 EP 0414696 B1 EP0414696 B1 EP 0414696B1 EP 19890903849 EP19890903849 EP 19890903849 EP 89903849 A EP89903849 A EP 89903849A EP 0414696 B1 EP0414696 B1 EP 0414696B1
Authority
EP
European Patent Office
Prior art keywords
rotor
layers
aluminium
spraying
face
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
EP19890903849
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English (en)
French (fr)
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EP0414696A1 (de
Inventor
Bertil Lundin
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.)
ABB Technology FLB AB
FlaektGroup Sweden AB
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ABB Flaekt AB
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Publication date
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Publication of EP0414696A1 publication Critical patent/EP0414696A1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
    • F28D19/04—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier
    • F28D19/041—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier with axial flow through the intermediate heat-transfer medium
    • F28D19/042—Rotors; Assemblies of heat absorbing masses

Definitions

  • the present invention concerns a rotor or similar core for use in humidity exchangers and/or heat exchangers comprising a number of fine channels running parallel to the rotor axis between two end faces of the rotor according to the first part of claim 1.
  • the invention is also concerned with a procedure for the manufacturing of a rotor of this nature.
  • Rotors of the type described and as known for example from US-A- 4 228 847 are normally manufactured by assembling and uniting, usually by glueing, alternatingly flat and corrugated layers, the structure so obtained consisting of one flat and one corrugated layer, being thereafter wound or coiled to form a rotor or similar core of essentially cylindrical form in which the individual coils are also mutually united by the method described or some other method.
  • rotors of this kind were made by joining sheets of non-metallic, fibrous, inorganic and incombustible material, but lately metal has come to be extensively used in the rotor layers, primarily aluminium, which is cheaper and also simpler to handle in manufacturing the rotor giving it equally good transfer properties while maintaining the non-combustion requirement.
  • the foil thickness is 50-100 ⁇ . In actual fact it would be possible to obtain satisfactory rotor performance by using even thinner material and thereby achieve a still lower manufacturing cost.
  • the use of aluminium foil of such a small thickness in the layer will entail problems.
  • edges of the exposed foil at the end faces of the rotor are sensible to pressure and point loads and can therefore be damaged by impacts to the end faces in handling and transport of the finished rotor after manufacture.
  • its end faces which constitute inlets and outlets for the air or gas flows passing through the rotor, are exposed to wear by sealings and to other effects caused by air and/or gas flows if they contain contaminations. Also large or small particles conveyed in the air or gas flow cause wear to the end faces of the rotor and may also attach to them or on their immediate fringe areas.
  • the contaminations are mainly of two kinds, i.e. chemical contaminations causing corrosion and eroding of the foil material, and mechanical, such as dust and different kinds of particles causing clogging of the fine channels. Both these types of contaminations have proved to have effects mainly on the rotor end surfaces down to a few millimeters in depth.
  • the alternative usually chosen is to use an alloy between aluminium and other substances giving the foil increased resistance to the contamination concerned and, in addition, the foil thicknes is increased in order to obtain further protection against weakening by corrosion attacks.
  • US-A-4 228 847 discloses a rotor in which the edges of the layers are reinforced by folding the strip material, especially the corrugated strip.
  • DE-B-1 776 210 discloses a contact body especially for cooling towers, in which the edges of the layers have been reinforced by dipping the non-metallic material.
  • the chief objective of the present invention is to achieve a rotor in which the problems described have been eliminated and a method of manufacturing such a rotor, which method produces even and flat end faces and a greater resistance to damage to all the rotor layers.
  • Fig 1 shows the perspective view of the rotor devised according to the procedure according to the invention aiming at strengthening the edges of the rotor layers at the one end face.
  • Fig. 2 is a perspective view in enlarged scale of a detail of the end face of the rotor according to Fig 1.
  • the rotor 10 shown on the drawing has the form of a cylinder with a hub 12 through which a shaft (not shown) passes, this shaft keeping the rotor rotatable in the suspension rack of an air humidity and/or heat exchanger.
  • the rotor body is formed by a number of alternatingly flat 14 and corrugated 16 layers (Fig. 2) inter-changingly joined and connected with each other and thereafter wound spirally on the cylindrical rotor body 10 at the same time as the individual coils are united with each other.
  • layers 14 and 16 consist of a thin metal, primarily an aluminium foil, or an aluminium alloy or similar, and are, in cases where the rotor is to be used for humidity transfer, hydroscopic, which is achieved by coating them with hydroscopic material or by surface restructuring of the material as such in order to render it hydroscopic.
  • the height of the folds in the corrugated layer 16 is as a rule less than 5 mm, e.g. 1-3mm, which consequently constitutes the height of the channels.
  • a strenghtening of the edges of the thin rotor layers 14, 16 is achieved by metal spraying of the end face of the rotor which means that finely dispersed metal, in the present case aluminium,is sprayed in molten condition onto the end face of the rotor.
  • the spraying should preferably be flame spraying with stranded aluminium which is melted with a gas flame or arch and sprayed finely dispersed onto the end face of the rotor with compressed air.
  • the metal particles are expelled towards the end face at high speed and when hitting the edges of layers 14 and 16 they are flattened out and attach mechanically to the surface structure of the layers by adhesion.
  • a tight metal coating is consequently built up, particle by particle upon each other, on the edges of layers 14 and 16, this metal coating rapidly forming its own oxides to generate an edge reinforcement as shown in the encircled and enlarged section of Fig.2.
  • the corrugated layers 16 protrude beyond the flat layers 14, which results in a heavier edge reinforcement being achieved on the corrugated layers. Since these corrugated layers 16 extend beyond the flat layers 14 the coating can consequently be made thicker without the pressure drop via the rotor being influenced, as the additionally reinforced edge portions of the corrugated layer 16 extend beyond the opening of the rotor channels.
  • the spraying on of the metal is done at an angle to that end face of the rotor 10 which is to be reinforced, for instance the one at 30° angle, which increases the adhesion between the metal particles being sprayed on and the rotor layers.
  • the apparatus 18, which is of a well-known design, and rotor 10 are during this process moving relative to each other, e.g. by the rotor 10 being rotated in order that the whole end face be coated when spraying.
  • Selfevidently more than one spraying apparatus 18 can be set up if desired.
  • the metal sprayed on should preferably be pure aluminium which provides excellent protection in a sulphurous atmosphere and has excellent resistance to smoke gases with high concentrations of sulphur dioxide or in sour environments.
  • the metal to be sprayed on be constituted of alloys between aluminium and some other metal, such as magnesium, zinc or similar.
  • the rotor By processing the rotor according to the description of the invention a number of advantages are obtained with regard to the rotor's resistance to damage due to point loads or abrasion or wear when in operation or when being cleaned.
  • the rotor is given a homogenous and durable surface with a higher corrosion resistance to air and gas flows which are sulphurous or contain salts or acids.
  • flame spraying with aluminium strands a much harder rotor end face is obtained, which facilitates cleaning of the rotor by flushing or spraying without the edges of the thin foil layers giving way under high point pressure.
  • the edge reinforcement obtained according to the description of the invention has proved to not significantly influence the pressure drop via the rotor 10, this particularly being the case in the embodiment alternative shown in Fig. 2, where the corrugated layer 16 extends beyond the flat layers 14, where the coating can be made thicker without the pressure drop being influenced.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Laminated Bodies (AREA)

Claims (8)

  1. Rotor oder ähnliches für Feuchte- und/oder Wärmetauscher mit mehreren, feinen Kanälen, die zwischen zwei Stirnflächen des Rotors (10) parallel zur Rotorachse verlaufen, wobei die Kanäle durch dünne Wände oder Lagen (14, 16) aus einer dünnen Folie getrennt sind und wobei die Kanten der Lagen (14, 16) an der Stirnfläche oder den Stirnflächen des Rotors mit einer Verstärkung versehen sind, dadurch gekennzeichnet, daß die Verstärkung aus einer Metallbeschichtung besteht, die auf die fertige Rotor-Stirnseite aufgesprüht worden ist.
  2. Rotor nach Anspruch 1, dadurch gekennzeichnet, daß das Material des Rotors Aluminium oder eine Aluminiumlegierung ist und daß das aufgesprühte Metall reines Aluminium ist.
  3. Rotor nach Anspruch 1, dadurch gekennzeichnet, daß das Rotormaterial Aluminium oder eine Aluminiumlegierung ist und daß das aufgesprühte Metall eine Legierung ist, die Aluminium enthält.
  4. Rotor nach einem der Ansprüche 1 bis 3, wobei die Kanäle durch ebene und gewellte Lagen gebildet sind, die abwechselnd miteinander verbunden und zu einem Rotorkörper aufgewickelt sind, dadurch gekennzeichnet, daß die gewellten Lagen (16) an der Stirnfläche des Rotors (10) über die ebenen Lagen (14) hinausragen.
  5. Verfahren zur Herstellung eines Rotors oder dergleichen für Feuchte- und/oder Wärmetauscher nach einem der Ansprüche 1 bis 4, durch Vorsehen von einer Anzahl feiner Kanäle zwischen den Stirnflächen des Rotors, die parallel zur Rotorwelle verlaufen, wobei die Kanäle durch dünne Wände von Lagen einer dünnen Folie voneinander getrennt ,sind und wobei die Kanten der Lagen mit einer Verstärkung versehen sind, dadurch gekennzeichnet, daß die Verstärkung der Kanten durch Aufsprühen eines metallischen Materials auf die Stirnfläche oder die Stirnflächen des fertigen Rotors bewerkstelligt wird.
  6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß das Aufsprühen des metallischen Materials unter einem Winkel zur Stirnfläche des Rotors von 10 bis 50°, vorzugsweise von 30°, stattfindet.
  7. Verfahren nach einem der Ansprüche 5 oder 6, dadurch gekennzeichnet, daß das Aufsprühen des metallischen Materials durch ein Flammspritzverfahren mit einem Strang oder einem Draht des metallischen Materials als Zusatz durchgeführt wird.
  8. Verfahren nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, daß von dem Rotorkörper während des Aufsprühens des metallischen Materials Wärme abgeführt wird.
EP19890903849 1988-03-11 1989-03-10 Kern zur anwendung in feuchte- und wärmetauschern und verfahren zur herstellung Expired - Lifetime EP0414696B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8800889A SE463736B (sv) 1988-03-11 1988-03-11 Rotor foer fukt- eller vaermevaexlare samt foerfarande foer dess framstaellning, varvid aendytorna aer foersedda med en foestaerkande belaeggning av paasprutad metall
SE8800889 1988-03-11

Publications (2)

Publication Number Publication Date
EP0414696A1 EP0414696A1 (de) 1991-03-06
EP0414696B1 true EP0414696B1 (de) 1993-05-12

Family

ID=20371663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890903849 Expired - Lifetime EP0414696B1 (de) 1988-03-11 1989-03-10 Kern zur anwendung in feuchte- und wärmetauschern und verfahren zur herstellung

Country Status (4)

Country Link
EP (1) EP0414696B1 (de)
JP (1) JP2665384B2 (de)
SE (1) SE463736B (de)
WO (1) WO1989008815A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE2350702A1 (en) * 2023-06-09 2024-12-10 Munters Europe Ab Gas sorption rotor for air treatment and method for manufacturing such gas sorption rotor
EP4603780A1 (de) 2024-02-15 2025-08-20 Alfa Laval Corporate AB Verfahren zur herstellung einer verstärkten wärmeübertragungsplatte mittels generativer fertigung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2983486A (en) * 1958-09-15 1961-05-09 Air Preheater Element arrangement for a regenerative heat exchanger
SE311371B (de) * 1966-01-26 1969-06-09 Munters C
SE423143B (sv) * 1978-02-16 1982-04-13 Munters Ab Carl Rotor eller likande kropp for fukt- och/eller vermevexlare samt sett for dess framstellning
DE2831075A1 (de) * 1978-07-14 1980-01-24 Idealspaten & Schaufelwalzwerk Schanzwerkzeug, insbesondere schaufel

Also Published As

Publication number Publication date
JP2665384B2 (ja) 1997-10-22
JPH03504265A (ja) 1991-09-19
SE463736B (sv) 1991-01-14
EP0414696A1 (de) 1991-03-06
SE8800889L (sv) 1989-09-12
WO1989008815A1 (en) 1989-09-21
SE8800889D0 (sv) 1988-03-11

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