DK158116B

DK158116B - Heat exchanger and method of producing the same

Info

Publication number: DK158116B
Application number: DK109283A
Authority: DK
Inventors: Jorma Huju
Original assignee: Laempoetaltio Oy
Priority date: 1982-03-05
Filing date: 1983-03-04
Publication date: 1990-03-26
Also published as: DK158116C; SE8301189L; DK109283A; FI69926C; FI69926B; NO830721L; SE8301189D0; NO155829B; FI820773L; DK109283D0

Description

Π \S Ί r ο Λ Λ ' Γ->Π \ S Ί r ο Λ Λ 'Γ->

Ur\ ί b ο ι ο d ιUr \ ί b ο ι ο d ι

Opfindelsen angår en varmeveksler med flere passager, som parvis er indbyrdes adskilt af en mellemvæg, hvor hver anden passage er strømningsvej for frisk luft, som skal opvarmes eller afkøles, og de øvrige passager er strømningsveje for afgangs-5 luft fra det rum, der skal ventileres, idet hver af væggene omfatter en plade, som er bøjet til dannelse af tværgående bøjninger på tværs af pladens plan.BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a multi-pass heat exchanger, separated in pairs by a partition, each second passage being the fresh air flow path to be heated or cooled, and the other passageways to the outlet air flow paths to be ventilated, each of the walls comprising a plate bent to form transverse bends across the plane of the plate.

Fra international patentansøgning nr. WO 81/02060 kendes en 10 varmeveksler, hvor pladeemnet er bøjet frem og tilbage i tværretningen til dannelse af passager. Emnets sider har form af savtænder, og længden af hver tand svarer i det væsentlige til bredden af varmevekslerens passage. Gavlene, som ligger direkte over for hinanden i hver passage, er halvvejs lukket i 15 savtandsidens længde. Herved kan der dannes U- eller S-formede strømningspassager.From International Patent Application No. WO 81/02060 a 10 heat exchanger is known in which the plate blank is bent back and forth in the transverse direction to form passages. The sides of the workpiece are in the form of saw teeth, and the length of each tooth corresponds substantially to the width of the heat exchanger passage. The gables, which are directly opposite each other in each passage, are halfway closed in the length of the sawtooth. Hereby U- or S-shaped flow passages can be formed.

En forbedret varmeveksler kan ifølge opfindelsen opnås ved at udforme pladerne i væggene som angivet i den kendetegnende del 20 af krav 1.An improved heat exchanger can be obtained according to the invention by forming the plates in the walls as defined in the characterizing part 20 of claim 1.

Når luftstrømmen føres gennem passagerne, ændres strømnings-retningen ca. 90°. Dette er en fordelagtig strømningsfigur, idet der i varmeveksleren tilvejebringes indre c irkulat i oner, 25 ved hjælp af hvilke indløbs- og af løbsstrømn i ngerne cirkuleres tilbage i varmeveksleren. Konstruktivt set opnås med varmeveksleren ifølge opfindelsen den fordel, at den er let at fremstille, og vedligeholdelse af konstruktionen er let at foretage gennem passagernes åbne sidekanter.As the air flow is passed through the passages, the flow direction changes approx. 90 °. This is an advantageous flow figure, in that in the heat exchanger, internal circulation is provided in ounces, by means of which inlet and flow streams are circulated back into the heat exchanger. Constructively, with the heat exchanger according to the invention, the advantage is that it is easy to manufacture and maintenance of the construction is easy to do through the open side edges of the passages.

3030

En særlig hensigtsmæssig fremgangsmåde til fremstilling af en sådan varmeveksler er beskrevet i krav 6.A particularly convenient process for producing such a heat exchanger is described in claim 6.

Anvendelsen af organer til bøjning af kontinurlige emner ar 35 kendt f.eks. fra tysk offentliggørelsesskrift nr. 2.620.419, som er beregnet for tilvirkning af køleribber for transformatorer. En sådan løsning er ikke tilpasset fremgangsmåden til tilvirkning af varmeveksleren ifølge opfindelsen.The use of means for bending continuous blanks is known e.g. from German Publication No. 2,620,419, which is intended for the manufacture of heat sinks for transformers. Such a solution is not adapted to the method of manufacturing the heat exchanger according to the invention.

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22

Opfindelsen skal nærmere forklares i det følgende under henvisning til tegningen, hvor fig. 1 illustrerer en fremgangsmåde og et apparatet til frem-5 stilling af en varmeveksler ifølge opfindelsen, fig. 2 apparatet i fig. 1 set oppefra, fig. 3-6 en illustration af de forskellige procestrin af frem-10 gangsmåden ifølge opfindelsen, fig. 7 et emne for en varmeveksler tilvejebragt ved fremgangsmåden ifølge opfindelsen, 15 fig. 8 en varmeveksler bestående af emnet i fig. 7 set i pilen A's retning fra emnets øvre kant og delvis i snit og fig. 9 en varmeveksler bestående af emnet i fig. 7 set i pilen B's retning fra emnets forreste kant.The invention will be explained in more detail below with reference to the drawing, in which 1 illustrates a method and apparatus for producing a heat exchanger according to the invention; FIG. 2 the apparatus of FIG. 1 is a top view; FIG. 3-6 is an illustration of the various process steps of the method according to the invention; Figure 7 is a blank for a heat exchanger provided by the method of the invention; 8 shows a heat exchanger consisting of the blank of FIG. 7 in the direction of arrow A from the upper edge of the blank and partly in section and fig. 9 shows a heat exchanger consisting of the blank of FIG. 7 in the direction of arrow B from the leading edge of the workpiece.

2020

Den i fig. 1-6 illustrerede fremgangsmåde og det dertil hørende apparat til fremstilling af varmeveksleren ifølge opfindelsen er kun vist skematisk. Apparatets bæreramme og hydraulikcylindre, til at drive apparatets dele via styreindretnin-25 ger, samt dertil hørende ledninger, er derfor ikke vist.The FIG. 1-6 illustrated and the associated apparatus for producing the heat exchanger according to the invention are shown schematically only. Therefore, the support frame and hydraulic cylinders of the apparatus for operating the parts of the apparatus via control devices and associated wires are not shown.

I fig. 1 og 2 vises med henvisningstallet 1 en pladeru Ile, som fortrinsvis udgøres af en bred aluminiumsplade af en bredde på 1-1,5 m. Pladerullen 1 afrulles kontinuerligt i pilens 2 ret-30 ning ved hjælp af valser 3, der virker som trækorganer i pladeemnets fremføringsretning og har en bredde i hovedsagen svarende til pladerullens 1 bredde. Valserne 3 er placeret på begge sider af pladeemnet 4. De tjener desuden til at tilvejebringe afstivningsvulster 5 i de dele af pladeemnet, der skal 35 udgøre vægge af varmeveksleren. Til tilvejebringelse af disse vulster 5, er der på omkredsen af valserne 3 tilvejebragt nogle fremspring. Omkredsen af valserne 3 er tilpasset til længden af afstivningsvulsterne 5, der skal tilvejebringes i over·In FIG. 1 and 2, reference numeral 1 shows a plate window 11, which is preferably a wide aluminum plate of a width of 1-1.5 m. The plate roll 1 is continuously rolled in the direction of arrow 2 by means of rollers 3 acting as pulling means. in the direction of the plate blank and has a width substantially equal to the width of the plate roll 1. The rollers 3 are located on both sides of the plate blank 4. They further serve to provide stiffening beads 5 in the parts of the plate blank which are to form walls of the heat exchanger. To provide these beads 5, some projections are provided on the circumference of the rollers 3. The circumference of the rollers 3 is adapted to the length of the stiffening rolls 5 to be provided in above ·

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3 ensstemmelse med fordelingen af vægge på en måde, som vil blive beskrevet i det følgende. Efter valserne 3 er der på begge sider af pladeemnet 4 et skæreorgan 6, der tjener til i pladeemnets 4 kanter at tilvejebringe nogle af afbøjningsope-5 rationer nødvendiggjorte kantudsparinger ved. de kanter af emnet 4, hvor maksimumpunkterne af nogle bøjninger 30 i kanterne af emnet befinder sig.3 in accordance with the distribution of walls in a manner which will be described below. After the rollers 3, on both sides of the plate blank 4 there is a cutting member 6 which serves to provide, at the edges of the plate blank 4, some of the deflection operations necessary edge cuts. the edges of the workpiece 4 where the maximum points of some bends 30 in the edges of the workpiece are located.

Efter skæreorganet 6 er der en formpresse 7, der set oppefra 2o har form som et rektangel. Formpressen 7 er anbragt således, at dens ene side 26 står vinkelret på emnets 4 bevægelsesretning og i det væsentlige modsvarer emnets bredde,*· medens den anden side er parallel med emnets 4 bevægelsesretning og modsvarer bredden af to sidevægge af varmeveksleren. I hvert fald 25 en af formpressens 7 dele 10 er indrettet til at kunne forskydes i lodret retning på føringer (pilen 11) ved hjælp af f.eks. hydraulikcylindre. Formpressens 7 flader, der presses mod emnet 4, er bearbejdet f.eks. ved fræsning og påsætning af sådanne organer, som - når formpressens dele 10, 12 presses 20 mod hinanden - danner former i den del af emnet 4, som ligger imellem pressedelene; på den ene side afstandsorganer 13, hvis funktion vil blive forklaret i det følgende, og i emnets kanter bøjninger 30 til dannelse af gavlvægge for varmevekslerens passager. Formpressen 7 skal desuden fungere som fast holder 25 for emnet 4 under bøjning af dette.After the cutting member 6 there is a molding press 7, which seen from above 20o has the shape of a rectangle. The molding press 7 is arranged such that one side 26 is perpendicular to the direction of movement of the blank 4 and substantially corresponds to the width of the blank, while the other side is parallel to the direction of movement of the blank 4 and corresponds to the width of two side walls of the heat exchanger. At least 25 one of the parts 10 of the molding press 7 is arranged to be displaced in a vertical direction on guides (arrow 11) by means of e.g. hydraulic cylinders. The faces of the mold press 7 pressed against the blank 4 are machined e.g. by milling and attaching such means which - when the molding parts 10, 12 of the molding press 20 are pressed against each other - forms in the part of the blank 4 which lies between the pressing parts; on the one hand, spacers 13, the function of which will be explained below, and on the edges of the blank bends 30 to form end walls for the heat exchanger passages. In addition, the molding press 7 is to act as a fixed holder 25 for the workpiece 4 during bending thereof.

Efter formpressen 7 er der over emnet 4 anbragt en tværgående bøjningsbjælke 14, som i det væsentlige har en bredde svarende til emnets bredde, og som ved hjælp af føringer og dertil hø-30 rende hydraulikcylindre er indrettet til at kunne forskydes vertikalt (pilen 15) og horisontalt (pilen 16).After the molding press 7, a transverse bending beam 14 is arranged above the blank 4, which is essentially a width corresponding to the width of the blank, and which is arranged to be vertically displaced by means of guides and associated hydraulic cylinders (arrow 15). and horizontally (arrow 16).

Efter den øvre bøjningsbjælke 14 er der en bevægelig holdedel 17 bestående af en holdeanordning 18, 20 og et holdebord 21 35 for det bøjede varmeVeksleremne. Over emnet 4 er der fastgjort en tværgående holdebjælke 18, der fungerer som modstykke for en nedre holdebjælke 20, som er monteret under emnet 4 og kan bevæges vertikalt (pilen 19) på føringer ved hjælp af en by-After the upper bend beam 14 there is a movable holding member 17 consisting of a holding device 18, 20 and a holding table 21 35 for the bent heat exchanger blank. Above the blank 4 is mounted a transverse holding beam 18, which acts as a counterpart to a lower holding beam 20, which is mounted under the blank 4 and can be moved vertically (arrow 19) on guides by means of an inner bar.

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4 draulisk cylinder. Udformningen af holdebjælkens 20 spids modsvarer udformningen af holdebjælkens 14 spids. I sin øvre stilling (fig. 1) presser bjælkerne 18 og 20, hvis længde i det væsentlige modsvarer emnets 4 bredde, emnet 4 imellem sig.4 draulic cylinder. The design of the tip of the retaining beam 20 corresponds to the design of the tip of the retaining beam 14. In its upper position (Fig. 1), the beams 18 and 20, the length of which substantially corresponds to the width of the workpiece 4, push the workpiece 4 between them.

5 Holdebordet 21 er placeret der, hvor bjælken 18 er monteret, og er bevægeligt i vertikel retning og er indrettet til at kunne forskydes på føringer i horisontal retning (pilen 22). Holdebordet 21 bærer det færdigt bøjede varmeveksleremne 23. Endvidere er der i holdebordets 21 kant under bjælkerne 18 og 10 20 omkring en horisontal akse (pilen 24) anbragt drejelige forskydere 25 for de nedre kanter af det bøjede varmeveksler-emne.The holding table 21 is located where the beam 18 is mounted and is movable in the vertical direction and is arranged to be displaceable on guides in a horizontal direction (arrow 22). The retaining table 21 carries the finished bent heat exchanger blank 23. Further, at the edge of the retaining table 21 below the beams 18 and 10 20, a rotary slider 25 is arranged around a horizontal axis (arrow 24) for the lower edges of the bent heat exchanger blank.

Apparatet til fremstilling af varmeveksleren virker på føl-15 gende måde. Efter afgang fra stillingen i fig. 6 presser formpressen 7 pladeemnet mellem delene 10, 12 (delen 10 forskydes nedad i pilen ll's retning). Formpressen 7 tilvejebringer derved også afstandsorganer 13 samt bøjninger 30 i kanterne af emnet til dannelse af gavlvægge. Formpressen 7 bibeholder dog 20 sin pressesti 11ing, og fungerer derved som fast holder for emnet under bøjningsoperationen. Tilsvarende er emnets øvre faste holdebjælke 18 samt emnets 4 nedre bevægelige holdebjælke 20 i pressestillingen, der er vist i fig. 1. I denne stilling modsvarer afstanden imellem formpressens 7 kant 26 og 25 delene 18 og 20 (afstanden A) bredden af to varmeveksleremner.The apparatus for producing the heat exchanger operates as follows. After leaving the position in FIG. 6, the molding press 7 presses the plate blank between the parts 10, 12 (the part 10 is moved downward in the direction of the arrow 11). The molding press 7 also thereby provides spacers 13 and bends 30 at the edges of the blanket wall forming part. However, the molding press 7 retains its pressurization 11, thereby acting as a fixed holder for the workpiece during the bending operation. Similarly, the upper fixed retaining beam 18 of the blank and the lower movable holding beam 20 of the blank 4 are in the pressing position shown in FIG. 1. In this position, the distance between the edge 26 of the mold press 7 and the parts 18 and 20 (the distance A) corresponds to the width of two heat exchanger blanks.

Den øvre bøjningsbjælke 14 befinder sig i dette trin (fig. i og 2) midt imellem formpressens kant 26 og delene 18, 20.The upper bending beam 14 is in this step (Figs. I and 2) midway between the edge 26 of the molding press and the portions 18, 20.

I fig. 3 vises begyndelsesstadiet af varmeveksleremnets bøj-3ø ning, hvor bøjningsbjælken 14 er forskudt nedad i pilens 15 retning samt mod venstre i pilens 16 retning og er presset nedad i bøjningsstedet mellem væggene af. Delen 17 følger i pilens 22 retning bjælkens 14 bevægelse mod venstre. Dette er muligt, eftersom delen 17 er bevægelig på horisontale førin-35 ger, ligesom holdebjælken 14, som samtidigt er indrettet til at kunne udføre vertikale bevægelser.In FIG. 3, the initial stage of the heat exchanger blank bend is shown, the bending beam 14 being displaced downwardly in the direction of arrow 15 as well as to the left in the direction of arrow 16 and pressed downwardly in the bending point between the walls. The portion 17 follows in the direction of arrow 22 the movement of the beam 14 to the left. This is possible since the part 17 is movable on horizontal guides, as is the holding beam 14, which is simultaneously arranged to be able to carry out vertical movements.

I fig. 4 vises slutstadiet af bevægelsen i fig. 3, hvor bjæ'· ken 14 er forskudt i retning af sin nedre stilling i pilens 15In FIG. 4 shows the final stage of the movement of FIG. 3, where the beam 14 is displaced in the direction of its lower position in the arrow 15

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5 retning, ligesom den er forskudt til sin venstre yderste stilling ved formpressens 7 kant, medens holdedelens 17 bjælker 18 og 20 er forskudt mod bjælkens højre side i pilen 22’s retning.5, just as it is offset to its left extreme position at the edge of the molding press 7, while the beams 18 and 20 of the holding member 17 are offset to the right side of the beam in the direction of arrow 22.

55

Som vist i f i g. 3 og 4, kan man udforme passagen af varmeveksleremnet på en sådan måde, at bredden af sidevæggene er a', og længden er emnets 4 bredde, medens passagens tværsnitsform i det væsentlige modsvarer bjælkens 14 tværsnitsform i vertikal 10 retning. Det ses, at man gennem valget af bjælkens 14 tværsnitsform let vil kunne variere passagens tværsnitsform.As shown in Figures 3 and 4, the passage of the heat exchanger blank can be designed such that the width of the sidewalls is a 'and the length is the width of the blank 4, while the cross-sectional shape of the passage substantially corresponds to the cross-sectional shape of the beam 14 in vertical 10 direction. It is seen that through the choice of the cross-sectional shape of the beam 14, the cross-sectional shape of the passage can be easily varied.

I fig. 5 vises det følgende trin af fremgangsmåden ifølge opfindelsen. Bøjningsbjælken 14 er først forskudt mod sin øvre 15 stilling i pilens 15' retning ud fra varmeveksleremnets bøjede passageform 28, som er udformet under det foregående trin - se fi g. 4. Derudover er bjælken 14 forskudt i pilens 16' retning til højre i fig. 5 til midtersti 11 i ngen i fig. 1 til bøjningsstedet mellem ved siden af hinanden anbragte vægge. Den som 20 fast holder fungerende formpresse 7 åbnes (pilen 11'), og holdedelen 22' forskydes mod højre i pilens 22' retning og træk-ker ligeledes emnet 4 mod højre. Valserne 3 former derved afstivningsvulsterne 5 i emnet, og skæreorganet 6 for tilvejebringelse af en kantudsparing aktiveres. Bjælkerne 18 og 20 25 står endnu i 1ukkesti 11 ing, idet emnet 4 fastholdes imellem bjælkerne.In FIG. 5 shows the following step of the method according to the invention. The bend beam 14 is first displaced to its upper position in the direction of arrow 15 'from the bent passage shape 28 of the heat exchanger, which is formed during the previous step - see Fig. 4. In addition, beam 14 is offset in the direction of arrow 16' to the right in FIG. . 5 to the middle path 11 of the FIG. 1 to the point of bending between adjacent walls. The molding press 7 which is operating firmly 7 is opened (arrow 11 ') and the holding portion 22' is displaced to the right in the direction of arrow 22 'and also pulls the blank 4 to the right. The rollers 3 thereby form the stiffening beads 5 in the blank and the cutting means 6 for providing an edge recess is activated. The beams 18 and 20 25 are still in the elevation 11, the blank 4 being held between the beams.

Når holdedelen 17, der virker som bevægelig holder for pladeemnet 4 og som holdeanordning for varmeveksleremnet 23, for-· 30 skydes så langt til højre i pilens 22' retning, at afstande! mellem formpressens 7 kant 26 og bjælkernes 18, 20 presse- stilling modsvarer dimensionen A i fig, 2, dvs. bredden af to vægge af varmeveksleremnet, standser delen 17, og emnets nedru holdebjælke 20 forskydes vertikalt til stillingen i fig. 5, 35 Derved vrides forskyderen 25 fra den nedre kant af det bøjede emne 28 omkring den horisontale akse i pilens 25 retning oy forskyder den nedre kant oven på holdebordet 21. Derefter vrides forskyderen 25 for den nedre kant i nedadgående retn;~g DK 158116 8 6 og den nedre bjælke 20 forskydes opad i pilens 19' retning til stillingen i fig. 1. Derved er der udført et arbejdsforløb, og holdedelen 17 er i stillingen i fig. 1 klar til at påbegynde et nyt arbejdsforløb.When the holding member 17, which acts as a movable holder for the plate blank 4 and as a holding device for the heat exchanger blank 23, is moved so far to the right in the direction of the arrow 22 'that distances! between the edge 26 of the molding press 7 and the pressing position of the beams 18, 20 corresponds to the dimension A in Fig. 2, ie. the width of two walls of the heat exchanger blank stops the portion 17, and the lower holding beam 20 of the blank is displaced vertically to the position of FIG. 5, 35 Thereby, the slider 25 is rotated from the lower edge of the bent blank 28 about the horizontal axis in the direction of the arrow 25 and displaces the lower edge on top of the holding table 21. Thereafter, the slider 25 is rotated for the lower edge in a downward direction; 8 6 and the lower beam 20 is displaced upwardly in the direction of arrow 19 'to the position of FIG. 1. In this way, a working process is carried out and the holding part 17 is in the position in fig. 1 ready to start a new work cycle.

5 I fig. 7 vises varmeveksleren i perspektiv og delvis i snit.5 In FIG. 7 shows the heat exchanger in perspective and partly in section.

De langsgående afstivningsvulster 5 er udeladt. Til højre i fig. 7 ses det færdigt bøjede varmeveksleremne og til venstre i emnet den form, i hvilken det tilføres til bøjningstrinnet 10 efter formpressen 7.The longitudinal stiffening beads 5 are omitted. To the right in FIG. 7, the finished bent heat exchanger blank and to the left of the blank are seen the form in which it is applied to the bending step 10 after the mold press 7.

13 og 13' er afstandsorganer, der er tilvejebragt i tværgående og i forhold til bøjningsstedet 33 symmetriske rækker, og som er udformet ved hjælp af formpressen 7 således, at de udstræk-15 ker sig fra emnets 4 hovedplan til enden af varmevekslerpassagen.13 and 13 'are spacers provided in transverse and symmetrical rows relative to the bending site 33 and formed by the molding press 7 so that they extend from the main plane of the workpiece 4 to the end of the heat exchanger passage.

Afstandsorganerne udstrækker sig skiftevis i hver sin retning fra emnets 4 hovedplan. Når emnet bøjes, føres afstandsorga-20 nerne mod hinanden og holder varmevekslerens vægge på en af afstandsorganernes dobbelte højde bestemt afstand fra hverandre og hindrer samtidigt, at varmevekslerens vægge vibrerer for meget, hvilket ellers kunne give anledning til støj.The spacers extend alternately in each direction from the main plane of the workpiece 4. When the workpiece is bent, the spacers are moved towards one another, keeping the walls of the heat exchanger at a double height determined by one of the spacers and at the same time preventing the walls of the heat exchanger from vibrating too much, which could otherwise cause noise.

25 De bøjninger, der danner gavlvæggene i varmeveksleren i fig.25 The bends forming the end walls of the heat exchanger of FIG.

7, og som har henvisningstallet 30, udformes på den tidligere skitserede måde i formpressen 7 ved hjælp af emnets 4 langsgående modstykker, som udformes i pressens 7 dele 10, 12.7, and having the reference numeral 30, is formed in the previously outlined manner in the molding press 7 by means of the longitudinal counterparts of the blank 4 formed in the parts 10, 12 of the press 7.

30 I udførelsen i fig. 7 står emnets 4 langsgående sidebøjninger 30 i hovedsagen vinkelret på emnets hovedplan. Bøjningerne 30 er i hver vægdel a' udført i modsatte retninger fra emnets 4 hovedplan (i emnets 4 tværretning). Bøjningerne 30 er langs begge kanter parallelle (i emnets længderetning). Bøjningerne 35 30 er desuden udført jævnt varierende i emnets 4 længderet ning, idet bøjningens 30 minimumssted ligger i niveau med emnets 4 hovedplan (punktet 31 i fig. 7), og højden af maksimumstedet i det væsentlige svarer til halvdelen af bredden i var-30 In the embodiment of FIG. 7, the longitudinal side bends 30 of the blank 4 are generally perpendicular to the main plane of the blank. The bends 30 in each wall part a 'are made in opposite directions from the main plane of the workpiece 4 (in the transverse direction of the workpiece 4). The bends 30 are parallel on both sides (longitudinally of the workpiece). In addition, the bends 35 30 are evenly varying in the longitudinal direction of the workpiece 4, the minimum location of the bend 30 being in line with the main plane of the workpiece 4 (point 31 in Fig. 7), and the height of the maximum site substantially corresponds to half the width of the workpiece.

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7 mevekslerens passage (punktet 32 i fig. 7). De nævnte maksimums- og minimumssteder i bøjningen 30 er desuden tilpasset emnets 4 tværgående bøjningssteder, dvs. linien 34, som modsvarer fastgørelsesstedet mellem bjælkerne 18 og 20 på linien 5 33, som modsvarer stedet for den øvre bøjningsbjælke ved bøj ningen, samt på linien 46, som modsvarer kanten af den som fast holder .fungerende formpresse 7. Det fremgår således, at der på begge de langsgående kanter af emnet 4 dannes en kontinuert ti 1 tagende og en kontinuert aftagende bøjning 30, idet 10 bøjningerne på emnets 4 forskellige kanter har forskellige retninger, og maksimums-og minimumsstederne befinder sig i forskellige trin i emnets 4 tværretning. Endvidere er bøjningernes 30 indretning og emnets 4 bøjningsretning valgt således, at bøjningerne - når man udfører emnets 4 tværgående 15 bøjning - stiller sig mod hinanden (bøjningerne 34 og 35 f konstruktionens forreste kant og bøjningerne 36 og 37 i konstruktionens bageste kant, hvor varmeveks1 eremnet presses sammen i pilens 38 retning - se fig. 7).7 shows the passage of the exchanger (point 32 in Fig. 7). The said maximum and minimum locations in the bend 30 are further adapted to the transverse bending locations of the workpiece, i. the line 34 which corresponds to the attachment point between the beams 18 and 20 on the line 5 33 which corresponds to the location of the upper bend beam at the bend, and on the line 46 which corresponds to the edge of the fixed molding press 7. It thus appears that on both longitudinal edges of the blank 4, a continuous ten 1 take-off and a continuous decreasing bend 30 are formed, the 10 bends on the different edges of the blank 4 having different directions, and the maximum and minimum locations being at different stages in the cross-direction of the blank 4. Further, the arrangement of the bends 30 and the bending direction of the workpiece 4 are selected such that the bends - when executing the transverse 15 bend of the workpiece 4 - stand against each other (the front edges of the construction 34 and 35 and the bends 36 and 37 at the rear edge of the construction, where the heat exchange compressed in the direction of arrow 38 - see Fig. 7).

20 Som det fremgår af fig. 7 ti 1 vejebri nges der indskæringer 39 i emnets 4 kanter ved hjælp af et skæreorgan i det tværgående bøjningssted i emnet 4, hvor maksimumstedet for bøjningen 30 til dannelse af emnets gavlvæg befinder sig. Disse indskæringer 39 muliggør en fri indretning af bøjningerne 30, selv om 25 emnet bøjes ca. 180° i tværretni ngen.20 As can be seen from FIG. 7 to 1, incisions 39 at the edges of the workpiece are weighted by a cutting member in the transverse bending site of the workpiece 4, where the maximum location of the bend 30 to form the end wall of the workpiece is located. These notches 39 allow for free alignment of the bends 30, although the workpiece bends approx. 180 ° in the transverse direction.

Ligeledes udformes der i formpressen 7 på bøjningen 30 st fastgørelsesorgan 40, bestående af en på bøjningens 30 kant udformet og i hovedsagen i emnets 4 hovedplan rettet fastgø-30 re 1 sesf 1ange. Flangerne 40 langs kanterne af bøjningerne 30 anbringes ved siden af hinanden under varmeveks1erens samling således, at væghalvdelene kan forenes ved de nævnte flanger 40, eksempelvis ved nitning eller lignende.Also, in the molding press 7 on the bend 30, fastening means 40 are formed, consisting of an attachment 1 formed in the main plane of the blank 4 in the main plane of the blank 4. The flanges 40 along the edges of the bends 30 are placed side by side during the heat exchanger assembly so that the wall halves can be joined by said flanges 40, for example, by riveting or the like.

35 Når man samler varmeveksleren ifølge opfindelsen fra det bøjede varmeveksleremne, der er vist i fig. 7, udføres under første trin emnets 4 skæring i tværretningen ved et tværgående bøjningssted således, at man får de ønskede passager til ie>When collecting the heat exchanger according to the invention from the bent heat exchanger blank shown in FIG. 7, during the first step, the cutting of the workpiece 4 is carried out in the transverse direction at a transverse bending point so as to obtain the desired passageways.

DK 158116BDK 158116B

8 varmeveksler, der skal fremstilles. Derefter forenes de mod hinanden liggende fastgørelsesflanger 40, eksempelvis ved nit-ning, hvorved slutproduktet bliver en varmeveksler, hvor ved siden af hinanden liggende passager er tilsluttet mod hveran-5 dre beliggende gavle, medens de øvrige gavle er åbne.8 heat exchangers to be manufactured. Then the adjacent fixing flanges 40 are joined, for example by riveting, whereby the end product becomes a heat exchanger, with adjacent passages connected to each other, while the other gables are open.

Indløbs- og af løbsstrømninger kan indrettes i varmeveksleren, eksempelvis i pilenes 41, 42 retninger, hvorved luftstrømmen indføres i varmeveksleren gennem de åbne kanter af passager 10 for enden af den lukkede gavl i hver passage, hvorefter luftens strømningsretning ændres, f.eks. 90°, i retning af varmevekslerens passage. De åbne kanter af varmevekslerens passager udstyres med dækplader. I strømningssituationen, der er vist ved hjælp af pilene 41 og 42, er det fordelagtigt at udforme 15 tværsnittet af passagerne således, at de indsnævres fra bøjningens 30 maksimumssted 32 til emnets 4 tværgående bøjningssted. Når passagens tværsnit herved reduceres, øges strømningsmodstanden, idet strømningsændringen i passagens længderetning lettes væsentligt. Som tidligere nævnt forbliver pas-20 sagernes anden sidekant i varmeveksleren åben, hvorved det er let at foretage en rengøring af passagerne ved disses sidekanter.Inlet and outlet flows can be arranged in the heat exchanger, for example in the directions of arrows 41, 42, whereby the air flow is introduced into the heat exchanger through the open edges of passages 10 at the end of the closed end in each passage, whereupon the flow direction of the air is changed, e.g. 90 °, in the direction of the heat exchanger passage. The open edges of the heat exchanger passages are fitted with cover plates. In the flow situation shown by arrows 41 and 42, it is advantageous to design the cross-section of the passageways so that they narrow from the maximum point 32 of the bend 30 to the transverse bend point of the workpiece 4. As the cross-section of the passage is thereby reduced, the flow resistance increases, as the flow change in the longitudinal direction of the passage is greatly facilitated. As previously mentioned, the second side edge of the passageways remains open in the heat exchanger, making it easy to clean the passages at their side edges.

Fig. 8 viser den sammensatte varmeveksler set i retningen A 25 i fig. 7. Med henvisningstallet 31 vises det modsvarende bøjningssted af emnet i figuren. Endvidere ses afstandsorganernes 13 position dér, hvor de er forskudt mod hinanden og derigennem holder passagens vægge i en af afstandsorganernes højde bestemt afstand fra hinanden. Den i tværsnit viste passage 43 30 er i den modsatte side. Passagerne 44 er åbne set fra retningen A.FIG. 8 shows the composite heat exchanger seen in the direction A 25 in FIG. 7. With reference numeral 31, the corresponding inflection point of the workpiece is shown in the figure. Furthermore, the position of the spacers 13 is seen where they are displaced against one another and thereby keep the walls of the passage at a distance determined from one another by the height of the spacers. The passage 43 30 shown in cross section is on the opposite side. Passages 44 are open from the direction A.

Fig. 9 viser varmeveksleren set fra retningen B i fig. 7. De førnævnte dele har samme henvisningstal. De åbne passager set 35 fra retningen B har henvisningstallet 45.FIG. 9 shows the heat exchanger seen from the direction B in FIG. 7. The aforementioned parts have the same reference numerals. The open passages seen 35 from direction B have the reference number 45.

Claims

1. A multi-pass heat exchanger separated in pairs by a partition (a '), every other passage being the fresh air flow path to be heated or cooled, and the other passageways being exhaust air flow paths from the space must be ventilated, each of the walls (a1) comprising a plate (4) bent to form transverse bends (33, 34, 39) across the plane of the plate, characterized in that the plate (4) at the end of the bends is provided with a bend (30) for closing one end of each passageway, these bends (30) being positioned to close the opposite ends of 15 adjacent flow paths.

Heat exchanger according to claim 1, characterized in that the bends (30) extend from the main plane of the limb wall (a ') in different directions at the ends of the intermediate wall, the bends (30) being provided with fastening flanges (40) formed in combination with the material of the plate (4) to join the bends (30) in pairs (34, 35 and 36, 37, respectively).

Heat exchanger according to claim 1 or 2, characterized in that the bends (30) are formed substantially perpendicular to the plane of the intermediate wall (a ') and that the fastening flanges (40) are substantially parallel to the main plane of the intermediate wall (a1), and that the end of each passageway (44) is closed by joining the pair of flanges (40) at the end end of the passageway (44). 30

Heat exchanger according to claims 1-3, characterized in that the bends (30) in the longitudinal direction of the workpiece (4) in the height are formed evenly alternating so that both the top and the bottom of the individual bend (30) are at one of the workpieces (30). 4) 35 transverse bending sites, whereby the bends in the different edges of the workpiece take different directions in different steps, the minimum site (31) being in the main plane of the workpiece (4) and the maximum site (32) in height substantially corresponding to half the width of DK 158116B of the passage (44), whereby the cross-section of each passage decreases from the maximum location (32) toward the minimum location (31).

Heat exchanger according to claim 4, characterized in that a crack (39) is located at the edge of the blank (4) at the maximum location (32) of the bend (30).

A method of producing a heat exchanger according to claims 1-5, using a fixed holder (7), a cross member (14) movable in the longitudinal and transverse direction of the workpiece (4) and a holding part movable in the longitudinal direction of the workpiece (4). (17) for bending the continuous workpiece (4) back and forth in the transverse direction, characterized in that the plate workpiece (4) is provided with spacers (13, 13 ') known per se and with bends formed at the edges of the workpiece (4). (30) and with fastening flanges (40) by pressing the workpiece into a molding press (10, 12) operating as a fixed holder (10, 12) at the same time as the workpiece (4) equipped with the means (13, 13 ', 30, 40) after passage of the fixed bracket 20 (7) is positioned between the fixed bracket (7) and the bracket part (17) which acts as a support for the bent heat exchanger blank, the distance (A) between the fastening points (26, 18, 20) of this bracket approximately corresponds to the double wall width of the heat exchanger that the cross member (14) located in the center 25 of the fastening locations (26, 18, 20), which are movable in the longitudinal direction (16) of the workpiece (4) against the main plane of the workpiece (4), are displaced in vertical direction (15), whereby the workpiece (4) is bent and the cross beam (14) ) is displaced vertically in the main plane of the workpiece (4) and towards the fixed bracket (7) in the longitudinal direction of the workpiece, the holding part (17) being positioned so as to be able to follow the movement of the cross beam (14) towards the fixed bracket, that the cross beam (14) is displaced from the bent passage (28) and the movable holding member (17) is displaced away from the fixed holder (7) at the distance (A), displacing the fastening location (18, 20) of the movable holding member (17) past the bent passage (28) by sliding the passage (28) away from the space between the holder (7, 17), bending the heat exchanger element (23) in step and securing the gable sides of the walls of the heat exchanger by 158116B makes a remover (40), which communicates with the side bends (30), to form vlvæggene. 5 10 15 20 25 30 35