DK148070B

DK148070B - PROCEDURE FOR THE PREPARATION OF A STIR HEATER

Info

Publication number: DK148070B
Application number: DK212376AA
Authority: DK
Inventors: Guenter Hoffmann
Original assignee: Guenter Hoffmann
Priority date: 1975-05-16
Filing date: 1976-05-13
Publication date: 1985-02-18
Also published as: SE460512B; FI62748C; NO138974C; ATA375475A; FI62748B; DK148070C; CH616543A5; SE7605545L; DK212376A; SE8306030D0; SE8306030L; DE2620157A1; FI761375A; NO138974B; NO761648L; AT350679B

Description

148070148070

Opfindelsen angår en fremgangsmåde til fremstilling af et rørvarmelegerne med en i den ene ende lukket rørformet kappe indeholdende mindst én U-formet varmeleder indlejret i et isolationsmateriale, som udfylder den øvrige del af hulrummet i kappen, ved hvilken fremgangsmåde den U-formede varmeleder fastholdes i et halvcirkelformet spor i et keramisk føringsstykke og af et kornformet isolationsmateriale, som fyldes i kappen under vibration.BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a method of manufacturing a tubular heat exchanger having a tubular casing closed at one end containing at least one U-shaped heat conductor embedded in an insulating material which fills the remaining portion of the cavity of the casing by which method the U-shaped heat conductor is retained. a semicircular groove in a ceramic guide piece and of a granular insulating material which is filled into the sheath during vibration.

Pra tysk patentskrift nr. 1.083.450 kendes et apparat til indføring af isolerende pulvermateriale i et rørformet hylster til et cylindrisk rørvarmelegerne med varmeledere anbragt langs midteraksen. Indføringen . af pulveret sker gennem rørhylsterets ene ende, idet apparatet udgøres af et i mellemrummet mellem ét i rørhylsteret indskudt ydre fyIderør og et koncentrisk i det ydre fylderør indskudt indre fylderør. De rør, der skal fyldes, er imidlertid åbne i begge ender af hensyn til at varmelederen skal kunne indføres og smeltes fast. Udstrømning af pulver forhindres ved hjælp af en plastprop.German Patent Specification No. 1,083,450 discloses an apparatus for introducing insulating powder material into a tubular sleeve for a cylindrical tube heater with heat conductors located along the center axis. The introduction. of the powder takes place through one end of the tube casing, the apparatus being constituted by an inner guide tube inserted into the outer casing in the space between one outer tube and a concentric inner tube. However, the pipes to be filled are open at both ends for the purpose of introducing and melting the heat conductor. Outflow of powder is prevented by a plastic plug.

Ved fremstilling af andre kendte i den ene ende lukkede varmeelementer med én eller flere varmeledere kan varmelederens ene ende eller en mellemliggende tilslutningsstift svejses eller loddes fast efter afslutning af påfyldningsprocessen.In the manufacture of other known heating elements closed at one end with one or more heat conductors, one end of the heat conductor or an intermediate connecting pin may be welded or soldered after the filling process is completed.

Det er desuden kendt at fremstille rørvarmelegemer med ensidigt lukkede rør på fyldemaskiner ved hjælp af en støttetråd, som forbindes med én eller flere varmeledere. Ved indføring og indtrykning af støttetråden i røret spændes varmelederen, og hensigtsmæssigt udformede fylderør med et passende ydre rør og to eller flere indskudte indre fylderør giver anledning til en indføring af isolationsmaterialet og en centrering af den samlede konstruktion.Furthermore, it is known to produce tubular heaters with unilaterally closed tubes on filling machines by means of a support wire which is connected to one or more heat conductors. Upon insertion and insertion of the support wire into the tube, the heat conductor is tensioned, and suitably formed filling tubes having a suitable outer tube and two or more inserted inner filling tubes give rise to an insertion of the insulation material and a centering of the overall structure.

Fra US patentskrift nr. 3.468.023 kendes en fremgangsmåde til fremstilling af rørvarmelegemer, hvor man har søgt at 148070 2 løse problemet ved at udvide kapperøret i den nederste ende, således at de nedefra indførte keramiske stykker fikseres med henblik på fastholdelse af varmelederne. Ved denne metode er det nødvendigt på forhånd at udvide den nederste del af metalkapperøret og efter afslutning af fyldningen igen at føre denne del af kappen tilbage til normal rørdimension i en yderligere arbejdsoperation. Også ved denne fremgangsmåde anvendes et i begge ender åbent kapperør, som skal lukkes i et sidste trin under fremstillingen.US Patent No. 3,468,023 discloses a method for producing tube heater bodies which have sought to solve the problem by extending the casing at the lower end so that the ceramic pieces introduced from below are fixed for retaining the heat conductors. In this method, it is necessary to advance in advance the lower part of the metal sheath pipe and, after completion of the filling, to return this part of the sheath to normal pipe dimension in a further working operation. Also in this method, a jacket tube open at both ends is used which must be closed in a final step during manufacture.

De kendte produktionsmetoder er imidlertid forholdsvis dyre på grund af de ekstra arbejdsoperationer.However, the known production methods are relatively expensive due to the extra work operations.

Formålet med opfindelsen er at anvise, hvorledes man eliminerer disse problemer, og dette formål er ifølge opfindelsen opnået ved, at varmelederens ender efter anbringelse af varme-lederen i det halvcirkelformede spor i føringsstykket stikkes ind i føringskanaler i et topstykke, hvilke føringskanaler slutter sig til hver sin ende af sporet i føringsstykket og gennem to føringsrør, der er forbundet til topstykket, hvorefter denne konstruktion sammen med et ydre rør, der omslutter topstykket, skydes ind i den rørformede kappe til et sted i nærheden af kappens lukkede ende, og det kornformede isolationsmateriale derefter under vibration fyldes ind i mellemrummet mellem føringsrørene og yderrøret, idet isolationsmaterialet gennem aksiale kanaler i topstykket føres til det keramiske føringsstykke og udfylder hulrummet omkring dette, hvorefter den del af den rørformede kappe, som omslutter dette hulrum, sammenpresses, hvorpå topstykket, føringsrørene og yderrøret lidt efter lidt under vibration og yderligere ifyldning af kornformet materiale trækkes ud af den rørformede kappe, og der til sidst foretages en yderligere komprimering ved f.eks. valsning eller hamring.The object of the invention is to indicate how to eliminate these problems and this object is achieved according to the invention by inserting the ends of the heat conductor in the semicircular groove in the guide piece into guide channels in a header which connects to the guide channels. each end of the groove in the guide piece and through two guide tubes connected to the head piece, after which this construction, together with an outer tube enclosing the head piece, is slid into the tubular sheath to a location near the closed end of the sheath, and the grain-shaped insulation material is then filled during vibration into the space between the guide tubes and the outer tube, the insulation material being passed through axial channels in the top piece to the ceramic guide piece and filling the cavity around it, after which the part of the tubular casing enclosing this cavity is compressed, whereupon the top piece and the outer tube little by little under vibration ion and further loading of granular material are withdrawn from the tubular sheath and finally further compression is carried out by e.g. rolling or hammering.

Opfindelsen skal nærmere forklares i det følgende under henvisning til tegningen, der viser et apparat til fremstilling 148070 3 af et rørvarmelegeme.The invention will be explained in more detail below with reference to the drawing, which shows an apparatus for making a pipe heater body.

Apparatet til fremstilling af et rørvarmelegerne har et yderrør 4, ved hvis ene ende der er fastgjort et topstykke 7, der har to i indbyrdes afstand aksialt forløbende føringskanaler 9 og nogle yderligere aksialt gennemgående kanaler 10 med bugtninger. Til de to cylindriske kanaler 9 er der sluttet nogle føringsrør 3. Føringsrørene er fastgjort til topstykket 7 og er aksiale forlængelser til kanalerne 9 i topstykket.The apparatus for producing a tube heater has an outer tube 4, at one end of which is attached a head piece 7, which has two spaced-apart guide channels 9 and some additional axially through channels 10 with bends. To the two cylindrical channels 9, some guide tubes 3 are connected. The guide tubes are attached to the head piece 7 and are axial extensions to the channels 9 in the head piece.

Under topstykket 7 er der et i hovedsagen halvcirkelformet keramisk føringsstykke 8 med et spor i den halvcirkelformede rand/ idet halvcirklens diameter i hovedsagen svarer til afstanden imellem de to kanaler 9 i topstykket.Below the header 7 there is a generally semicircular ceramic guide piece 8 with a groove in the semicircular rim, with the diameter of the semicircle substantially corresponding to the distance between the two channels 9 in the header.

Det rørformede varmeelement fremstilles på følgende måde:The tubular heating element is prepared as follows:

Man bøjer den skruelinieformede varmeleder 6 til U-form og lægger U-ets bue i sporet i føringsstykket 8 og trækker de to ender, der fortrinsvis er udformet som stive tilslutningsstifter 1, gennem kanalerne 9 og føringsrørene 3 ved hjælp af træktråde, således at tilslutningsstifterne til slut befinder sig i samme højde og konstruktionen har den ønskede længde. Derefter stikker man yderrøret 4 med det keramiske føringsstykke 8 og topstykket 7 og de tilhørende rør 3 så langt ind i et kapperør 5, som danner den endelige omhylning af rørvarmelegemet, at det keramiske føringsstykke 8 står i den nødvendige afstand over bunden af kapperøret. Derefter fylder man kornformet isolationsmateriale ind i det frie rum imellem yderrøret 4 og føringsrørene 3 og sætter det hele i vibration, hvorved det kornformede isolationsmateriale lidt efter lidt løb.er ind gennem kanalerne 9 og udfylder rummet under topstykket 7, således at det keramiske føringsstykke 8 er helt omsluttet. Føringsstykket er derefter fastholdt i forhold til kapparøret 5 ved et alsidigt tryk på kapperøret, og den derved fremkaldte komprimering af det kornformede materiale. Til sidst trækkes topstykket 7 ud, og det kornformedeThe helical heat conductor 6 is bent into a U-shape and the arc of the U-shaped is inserted in the groove in the guide piece 8 and the two ends, which are preferably formed as rigid connection pins 1, pass through the channels 9 and the guide tubes 3 by means of pull threads, so that the connecting pins finally it is at the same height and the construction has the desired length. Then, the outer tube 4 with the ceramic guide piece 8 and the head piece 7 and the associated tubes 3 is inserted so far into a casing tube 5 which forms the final casing of the tube heating body that the ceramic guide piece 8 is at the required distance above the bottom of the casing tube. Then, granular insulating material is filled into the free space between the outer tube 4 and the guide tubes 3 and vibrated, whereby the granular insulating material gradually flows through the ducts 9 and fills the space below the cylinder head 7 so that the ceramic guide piece 8 is completely enclosed. The guide piece is then retained relative to the sheath tube 5 by a versatile pressure on the sheath tube, and the resulting compression of the granular material. Finally, the top piece 7 is pulled out and the grain is formed

Claims

Material continues to be gradually filled until it reaches the top end of the casing tube 5 and the entire space surrounding the leg 1 of the heat conductor 6 is filled with insulating material. The two legs 1 of the heat conductor 6 are now spaced apart from each other and from the casing tube 5, being completely embedded in the granular material and kept at the desired distance by this. Thereafter, the insulating material can be subjected to yet another compaction and thereby completely fixed. Claims. A method of producing a tube heater with a tubular casing (5) closed at one end, containing at least one U-shaped heat conductor (6) embedded in an insulating material which fills the remaining portion of the cavity in the casing (5), wherein: the U-shaped heat conductor (6) is held in a semicircular groove in a ceramic guide piece (8), and by a granular insulating material filled in the casing (5) during vibration, characterized in that the heat conductor (6) ends after placing the heat conductor in the semicircular groove in the guide piece (8) is inserted into guide channels (9) in a head piece (7), which guide channels (9) connect to each end of the groove in the guide piece (8), and through two guide tube (3) connected to the head piece (7), after which this construction, together with an outer tube (4) enclosing the head piece (7), is pushed into the tubular sheath (5) to a location near the closed end of the sheath , and the comformed insulation material e is then filled into the space between the guide tubes (3) and the outer tube (4) during vibration, the insulating material being passed through the axial channels (10) in the head piece (7) to the ceramic guide piece (8) and filling the space around it, after which the part of the the tubular sheath (5) enclosing said cavity