EP0662592B1 - Three-pass boiler - Google Patents

Three-pass boiler Download PDF

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Publication number
EP0662592B1
EP0662592B1 EP94119802A EP94119802A EP0662592B1 EP 0662592 B1 EP0662592 B1 EP 0662592B1 EP 94119802 A EP94119802 A EP 94119802A EP 94119802 A EP94119802 A EP 94119802A EP 0662592 B1 EP0662592 B1 EP 0662592B1
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EP
European Patent Office
Prior art keywords
flue
combustion chamber
passageways
type boiler
boiler according
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
EP94119802A
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German (de)
French (fr)
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EP0662592A1 (en
Inventor
Helmut Prof.-Dr.Ing. Burger
Robert Hofmann
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.)
Viessmann Werke GmbH and Co KG
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Viessmann Werke GmbH and Co KG
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Publication of EP0662592A1 publication Critical patent/EP0662592A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/24—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers
    • F24H1/26—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body
    • F24H1/263—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body with a dry-wall combustion chamber

Definitions

  • the invention relates to a three-pass boiler according to the preamble of claim 1.
  • Such three-pass boilers are known, for example, according to CH-A-485 182.
  • the term "parallel extension" with regard to the third train is to be understood to mean that the channels of the third train extend between the channels of the second train, i.e. the heating gases flow through the combustion chamber and the two subsequent trains in countercurrent.
  • the fact that the heating gases cool down on their way to the heating gas outlet, i.e. reduce their volume, has so far only been met by heating gas inlet inserts, the density of which increases towards the outlet side, that the cross-section of the third train, for example, is smaller than that of the second train or that, according to DE-A-35 35 341, the longitudinal rib trim is tighter towards the trigger side.
  • Such an adjustment can also be achieved by installing several, correspondingly smaller cross-sectional tubes in the water-carrying housing for the third train.
  • the invention has for its object to improve and design a three-pass boiler of the type mentioned in such a way that the entire flow path behind the combustion chamber is continuously adapted to the decreasing heating gas volume and the decreasing flow rate of the heating gases, that is, it should be largely the same Flow speed must be accessible along the entire path.
  • the conical shape of the channels of the second train in plan view and in longitudinal cross section is used to form the conical channels of the third train with the reverse conical spaces between these conical channels of the second train. Because the outflow cross sections of the channels forming the second train are the inflow cross sections flow cross-sections of the channels of the third train, there is a continuously narrowing flow path for the heating gases, that is, they pass through the heat transfer surfaces with largely the same flow rate, which is also associated with an improved heat transfer and thus enables a compact design of such boilers .
  • combustion chamber 1 consists of a water-carrying housing 1 with a combustion chamber 3 forming the first train 2 with burner-distant, for the second in 4 channels 4, the combustion chamber 3 comprehensive draft 4 leading discharge openings 5, to which second train 4 the third train 6, also divided into channels 6 'and also comprising the combustion chamber 3, extends in parallel.
  • the combustion chamber closure with the burner is not shown.
  • the channels 4 ', 6' of the trains 4, 6 are delimited by webs 10 placed on the combustion chamber wall 3 'or on an outer jacket 9 delimiting the channels 4', 6 'to the water side, and the free ends 10 'of the webs 10 are in thermal contact with the outer jacket 9 or the combustion chamber wall 3'.
  • the free Ends 10 'of the webs 10 can be formed as an offset contact strip 10''for the outer jacket 9 or for the combustion chamber wall 3'.
  • the channels 4 ', 6' of the trains 4, 6 can be formed by cross-sectionally U-shaped folds 11 of the wall 12 concentrically surrounding the combustion chamber 3, the open spaces 13 between the folds 11 closed with cover strips 14 and all channels 4 ', 6' are enclosed by an outer jacket 9 '.
  • These folds 11 are attached to a correspondingly dimensioned sheet metal blank with suitable folding devices, after which this folded sheet metal blank is rounded and made endless with a longitudinal weld seam. Only then are the correspondingly cut cover strips 14 welded in, for which spot welds are sufficient, since these cover strips 14 are only on the gas side.
  • the channels 4 ', 6' can also be molded into a cast body 18 according to FIG. 5, which is installed in a suitable manner and appropriately sealed in the housing 1 made of sheet steel or also made of cast iron.
  • the cast body 18 is advantageously formed from at least two parts T arranged axially one behind the other, and these parts T are arranged in a steel sheet jacket 19 in a heat-conducting manner, and preferably shrink-wrapped.
  • the design of the three-pass boiler according to FIG. 4C is particularly advantageous in that it can counteract the risk of condensate formation, namely by arranging the third pass 6 in the folding areas of the U-shaped folds 11, where the base webs 11 ' of these folds are in thermal contact with the outer jacket 9 ', ie, this results in double-skin construction with "braked” heat transfer in the condensate-critical area of the third train 6.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Control Of Combustion (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Abstract

The heating boiler has a water-conducting housing with a combustion chamber forming the first draught. Remote from the burner, draught apertures (5) lead to the second draught (4) in channels (4') encompassing the combustion chamber. To the second draught, the third draught (6) in channels (6') encompassing the combustion chamber extends in parallel. The channels of the second draught are dimensioned to the burner side with reducing cross-section (Q) and between these channels the channels of the third draught to the draught side with reducing cross-section (7). The outflow cross-sections (7) of the second draught correspond to the inflow cross-sections (8) of the third draught.

Description

Die Erfindung betrifft einen Dreizug-Heizkessel gemäß Oberbegriff des Patentanspruches 1.The invention relates to a three-pass boiler according to the preamble of claim 1.

Derartige Dreizug-Heizkessel sind bspw. nach der CH-A-485 182 bekannt. Unter "parallel erstreckt" bezgl. des dritten Zuges ist dabei zu verstehen, daß sich die Kanäle des dritten Zuges zwischen den Kanälen des zweiten Zuges erstrecken, d.h., die Heizgase durchströmen die Brennkammer und die beiden Folgezüge jeweils im Gegenstrom. Der Gegebenheit, daß sich die Heizgase auf ihrem Weg zum Heizgasabzug abkühlen, also ihr Volumen reduzieren, ist bislang nur durch Heizgaszugeinsätze entsprochen worden, deren Dichteanordnung zur Abzugsseite hin zunimmt, daß man den Querschnitt bspw. des dritten Zuges kleiner bemißt als den des zweiten Zuges oder daß man gemäß DE-A-35 35 341 den Längsrippenbesatz zur Abzugsseite hin enger anlegt. Eine solche Anpassung kann auch dadurch erreicht werden, daß man für den dritten Zug mehrere, entsprechend querschnittskleinere Rohre im wasserführenden Gehäuse einbaut.Such three-pass boilers are known, for example, according to CH-A-485 182. The term "parallel extension" with regard to the third train is to be understood to mean that the channels of the third train extend between the channels of the second train, i.e. the heating gases flow through the combustion chamber and the two subsequent trains in countercurrent. The fact that the heating gases cool down on their way to the heating gas outlet, i.e. reduce their volume, has so far only been met by heating gas inlet inserts, the density of which increases towards the outlet side, that the cross-section of the third train, for example, is smaller than that of the second train or that, according to DE-A-35 35 341, the longitudinal rib trim is tighter towards the trigger side. Such an adjustment can also be achieved by installing several, correspondingly smaller cross-sectional tubes in the water-carrying housing for the third train.

Der Erfindung liegt die Aufgabe zugrunde, einen Dreizug-Heizkessel der eingangs genannten Art dahingehend zu verbessern und auszubilden, daß der gesamte Strömungsweg hinter der Brennkammer kontinuierlich dem abnehmenden Heizgasvolumen und der sich damit mindernden Strömungsgeschwindigkeit der Heizgase angepaßt ist, d.h., es soll eine weitgehend gleiche Strömungsgeschwindigkeit auf der ganzen Weglänge erreichbar sein.The invention has for its object to improve and design a three-pass boiler of the type mentioned in such a way that the entire flow path behind the combustion chamber is continuously adapted to the decreasing heating gas volume and the decreasing flow rate of the heating gases, that is, it should be largely the same Flow speed must be accessible along the entire path.

Diese Aufgabe ist mit einem Dreizug-Heizkessel der gattungsgemäßen Art nach der Erfindung durch die im Kennzeichen des tentanspruches 1 angeführten Merkmale gelöst.This object is achieved with a three-pass boiler of the generic type according to the invention by the features stated in the characterizing part of claim 1.

Bei dieser erfindungsgemäßen Ausbildung wird also die in Draufsicht und im Längsquerschnitt konische Form der Kanäle des zweiten Zuges ausgenutzt, um mit den umgekehrt konischen Zwischenräumen zwischen diesen konischen Kanälen des zweiten Zuges die konischen Kanäle des dritten Zuges zu bilden. Da die Abströmquerschnitte der den zweiten Zug bildenden Kanäle den Zuströmquerschnitten strömquerschnitten der Kanäle des dritten Zuges entsprechen, ergibt sich also ein sich insgesamt kontinuierlich verengender Strömungsweg für die Heizgase, d.h., diese passieren die Wärmeübergangs flächen mit weitestgehend gleicher Strömungsgeschwindigkeit, was auch insgesamt mit einem verbesserten Wärmeübergang verbunden ist und damit eine kompakte Bauweise derartiger Kessel ermöglicht.In this embodiment according to the invention, the conical shape of the channels of the second train in plan view and in longitudinal cross section is used to form the conical channels of the third train with the reverse conical spaces between these conical channels of the second train. Because the outflow cross sections of the channels forming the second train are the inflow cross sections flow cross-sections of the channels of the third train, there is a continuously narrowing flow path for the heating gases, that is, they pass through the heat transfer surfaces with largely the same flow rate, which is also associated with an improved heat transfer and thus enables a compact design of such boilers .

Bezüglich des Grundprinzips der Heizgaszuganpassung an das sich durch zunehmende Abkühlung reduzierende Abgasvolumen wird auf die DE-A-29 52 564 und die DE-A-16 79 396 verwiesen, bei deren Gegenständen es sich um Zweizugkessel handelt, wobei lediglich die sich an die Umkehrbrennkammer anschließenden, den zweiten Zug bildenden Heizgaszüge zur Abzugsseite hin verengen.With regard to the basic principle of adapting the heating gas flue to the exhaust gas volume which is reduced by increasing cooling, reference is made to DE-A-29 52 564 and DE-A-16 79 396, the objects of which are two-pass boilers, only those relating to the reversing combustion chamber then narrow the hot gas flues forming the second draft to the exhaust side.

Der erfindungsgemäße Dreizug-Heizkessel und dessen vorteilhaften und praktischen Ausführungsformen werden nachfolgend anhand der zeichnerischen Darstellung von Ausführungsbeispielen näher erläutert.The three-pass boiler according to the invention and its advantageous and practical embodiments are explained in more detail below with reference to the drawing of exemplary embodiments.

Es zeigen

Fig. 1
einen Längsschnitt durch einen Dreizug-Heizkessel längs Linie I-I in Fig. 3;
Fig. 2
eine Draufsicht auf die in "Abwicklung" dargestellten, den zweiten und dritten Zug bildenden Kanäle;
Fig. 3
einen Schnitt durch den Dreizug-Heizkessel längs Linie III-III in Fig. 1;
Fig.4A-C
Schnitte unterschiedlicher Ausführungsformen der zweiten und dritten Züge aus Stahlblech;
Fig. 5
einen Schnitt durch eine Guß-Ausführungsform der heizgasführenden Räume;
Fig. 6
einen Längsschnitt durch eine besondere Guß-Ausführungsform und
Fig.7A,B
weitere Schnitte durch Guß-Ausführungsformen.
Show it
Fig. 1
a longitudinal section through a three-pass boiler along line II in Fig. 3;
Fig. 2
a plan view of the channels shown in "development", the second and third train forming channels;
Fig. 3
a section through the three-pass boiler along line III-III in Fig. 1;
Fig. 4A-C
Cuts of different embodiments of the second and third trains made of sheet steel;
Fig. 5
a section through a cast embodiment of the hot gas-carrying spaces;
Fig. 6
a longitudinal section through a special cast embodiment and
Fig. 7A, B
further cuts through cast designs.

Der Dreizug-Heizkessel besteht gemäß Fig. 1 aus einem wasserführenden Gehäuse 1 mit einer den ersten Zug 2 bildenden Brennkammer 3 mit brennerfernen, zum zweiten in Kanäle 4' gegliederten, die Brennkammer 3 umfassenden Zug 4 führenden Abzugsöffnungen 5, zu welchem zweiten Zug 4 der dritte, ebenfalls in Kanäle 6' gegliederte und ebenfalls die Brennkammer 3 umfassende Zug 6 parallel erstreckt ist. Nicht dargestellt ist der Brennkammerverschluß mit dem Brenner.1 consists of a water-carrying housing 1 with a combustion chamber 3 forming the first train 2 with burner-distant, for the second in 4 channels 4, the combustion chamber 3 comprehensive draft 4 leading discharge openings 5, to which second train 4 the third train 6, also divided into channels 6 'and also comprising the combustion chamber 3, extends in parallel. The combustion chamber closure with the burner is not shown.

Für einen solchen Dreizug-Heizkessel ist nun wesentlich, und dies gilt für alle nachfolgend beschriebenen Ausführungsformen, daß gemäß Abwicklungsdarstellung in Fig. 2 die Kanäle 4' des zweiten Zuges 4 zur Brennerseite hin mit abnehmenden Querschnitten Q und zwischen diesen Kanälen 4' die Kanäle 6' des dritten Zuges 6 zur Abzugsseite hin mit abnehmenden Querschnitten Q bemessen sind, wobei die Abströmquerschnitte 7 des zweiten Zuges 4 den Zuströmquerschnitten 8 des dritten Zuges 6 entsprechen. Abgesehen von den Überströmbereichen zwischen den Abström- und Zuströmquerschnitten 7, 8 ergibt sich durch diese Ausbildung der Kanäle 4', 6' eine kontinuierliche Verengung des gesamten Strömungsweges von den Abzugsöffnungen 5 am Ende der Brennkammer 3 bis zu den Ausmündungen 8' des dritten Zuges, von denen aus die Heiz- bzw. Abgase in den Abzugsstutzen 20 des Gehäuses 1 gelangen. Dieser gesamte Strömungsweg wird mit im wesentlichen gleicher Strömungsgeschwindigkeit von den Heizgasen passiert.It is now essential for such a three-pass boiler, and this applies to all the embodiments described below, that according to the development representation in FIG. 2, the passages 4 'of the second pass 4 towards the burner side with decreasing cross sections Q and between these passages 4' the passages 6 'of the third train 6 are dimensioned towards the discharge side with decreasing cross sections Q, the outflow cross sections 7 of the second train 4 corresponding to the inflow cross sections 8 of the third train 6. Apart from the overflow areas between the outflow and inflow cross sections 7, 8, this design of the channels 4 ', 6' results in a continuous narrowing of the entire flow path from the discharge openings 5 at the end of the combustion chamber 3 to the outlets 8 'of the third train, from which the heating or exhaust gases get into the exhaust pipe 20 of the housing 1. This entire flow path is passed by the heating gases at essentially the same flow rate.

In den Fig. 2 bis 7 sind unterschiedliche Ausführungsformen dargestellt.2 to 7 different embodiments are shown.

Gemäß Fig. 4A, B sind die Kanäle 4', 6' der Züge 4, 6 durch auf die Brennkammerwand 3' oder auf einen die Kanäle 4', 6' zur Wasserseite begrenzenden Außenmantel 9 wärmeleitend aufgesetzte Stege 10 begrenzt, und die freien Enden 10' der Stege 10 stehen in Wärmeleitkontakt mit dem Außenmantel 9 oder der Brennkammerwand 3'. Dabei können, wie ebenfalls dargestellt, die freien Enden 10' der Stege 10 als abgekröpfte Anlagestreifen 10'' zum Außenmantel 9 oder zur Brennkammerwand 3' ausgebildet sein. Beim Zuschnitt der Stege 10 ist zu berücksichtigen, daß sich diese nicht auf geraden Zylindermantellinien, sondern längs sehr steiler Schraubenlinien erstrecken. Wie in Fig. 4C dargestellt, können die kanäle 4', 6' der Züge 4, 6 durch im Querschnitt u-förmige Faltungen 11 der die Brennkammer 3 konzentrisch umgebenden Wand 12 gebildet, die Freiflächen 13 zwischen den Faltungen 11 mit Abdeckstreifen 14 verschlossen und alle Kanäle 4', 6' mit einem Außenmantel 9' umschlossen sein. Diese Faltungen 11 werden an einem entsprechend bemessenen Blechzuschnitt mit geeigneten Falteinrichtungen angebracht, wonach dann dieser gefaltete Blechzuschnitt gerundet und mit einer Längsschweißnaht endlos gemacht wird. Erst dann werden die entsprechend zugeschnittenen Abdeckstreifen 14 eingeschweißt, wofür punktuelle Anschweißungen genügen, da sich diese Abdeckstreifen 14 nur auf der Gasseite befinden. Außerdem ist es unter Verweis auf Fig. 3 auch möglich, die Kanäle 4', 6' durch auf die Brennkammerwand 3' oder durch auf einen Außenmantel 9 aufgesetzte, im Querschnitt u-förmige Profile 15 zu bilden und die Freiflächen 13 zwischen den Profilen 15 durch Abdeckstreifen 16 oder durch eine brennkammerseitige oder wasserseitige Begrenzungswand 17 zu verschließen. Dargestellt ist in Fig. 3 nur die Ausführungsform, bei der die Profile 15 auf den Außenmantel 9 aufgesetzt sind.4A, B, the channels 4 ', 6' of the trains 4, 6 are delimited by webs 10 placed on the combustion chamber wall 3 'or on an outer jacket 9 delimiting the channels 4', 6 'to the water side, and the free ends 10 'of the webs 10 are in thermal contact with the outer jacket 9 or the combustion chamber wall 3'. As also shown, the free Ends 10 'of the webs 10 can be formed as an offset contact strip 10''for the outer jacket 9 or for the combustion chamber wall 3'. When cutting the webs 10, it must be taken into account that they do not extend on straight cylindrical surface lines, but along very steep helical lines. As shown in Fig. 4C, the channels 4 ', 6' of the trains 4, 6 can be formed by cross-sectionally U-shaped folds 11 of the wall 12 concentrically surrounding the combustion chamber 3, the open spaces 13 between the folds 11 closed with cover strips 14 and all channels 4 ', 6' are enclosed by an outer jacket 9 '. These folds 11 are attached to a correspondingly dimensioned sheet metal blank with suitable folding devices, after which this folded sheet metal blank is rounded and made endless with a longitudinal weld seam. Only then are the correspondingly cut cover strips 14 welded in, for which spot welds are sufficient, since these cover strips 14 are only on the gas side. With reference to FIG. 3, it is also possible to form the channels 4 ', 6' by profiles 15 which are U-shaped in cross section and placed on the combustion chamber wall 3 'or on an outer jacket 9, and the open areas 13 between the profiles 15 to be closed by cover strips 16 or by a boundary wall 17 on the combustion chamber or water side. 3 shows only the embodiment in which the profiles 15 are placed on the outer jacket 9.

Die Kanäle 4', 6' können aber auch gemäß Fig. 5 in einen Gußkörper 18 eingeformt sein, der in geeigneter Weise und entsprechend abgedichtet in das Gehäuse 1 aus Stahlblech oder ebenfalls aus Guß eingebaut wird. Vorteilhafter wird jedoch gemäß Fig. 6 der Gußkörper 18 aus mindestens zwei axial hintereinander angeordneten Teilen T gebildet, und diese Teile T sind in einem Stahlblechmantel 19 wärmeleitend angeordnet, und zwar vorzugsweise eingeschrumpft.The channels 4 ', 6' can also be molded into a cast body 18 according to FIG. 5, which is installed in a suitable manner and appropriately sealed in the housing 1 made of sheet steel or also made of cast iron. 6, the cast body 18 is advantageously formed from at least two parts T arranged axially one behind the other, and these parts T are arranged in a steel sheet jacket 19 in a heat-conducting manner, and preferably shrink-wrapped.

Schließlich ist die Ausbildung sich zur Abzugsseite hin kontinuierlich verengender Kanäle 4', 6' auch gemäß Fig. 7A, B zu verwirklichen, wobei die Kanäle 4', 6' von Gußrippen 21 be grenzt werden und durch Stahlblechmäntel 22 zur Brennkammer 3 (Fig. 7A) oder zur Wasserseite hin (Fig. 7B) verschlossen sind.Finally, the formation of continuously narrowing channels 4 ', 6' towards the discharge side can also be realized according to FIGS. 7A, B, the channels 4 ', 6' being of cast ribs 21 are bordered and closed by sheet steel shells 22 to the combustion chamber 3 (FIG. 7A) or to the water side (FIG. 7B).

Die Ausbildung des Dreizug-Heizkessels nach Fig. 4C ist insofern besonders vorteilhaft, weil damit der Gefahr von Kondensatbildung entgegengewirkt werden kann, nämlich dadurch, daß der dritte Zug 6 in den Faltungsbereichen der u-förmigen Faltungen 11 angeordnet wird, wo die Basisstege 11' dieser Faltungen mit dem Außenmantel 9' in Wärmeleitkontakt stehen, d.h., es ergibt sich dadurch Doppelschaligkeit mit "gebremstem" Wärmeübergang im kondensatkritischen Bereich des dritten Zuges 6.The design of the three-pass boiler according to FIG. 4C is particularly advantageous in that it can counteract the risk of condensate formation, namely by arranging the third pass 6 in the folding areas of the U-shaped folds 11, where the base webs 11 ' of these folds are in thermal contact with the outer jacket 9 ', ie, this results in double-skin construction with "braked" heat transfer in the condensate-critical area of the third train 6.

Im übrigen bestünde bei den Gußausführungen gemäß Fig. 5, 6 die Möglichkeit, die dortigen Basisstege 11' dicker auszubilden als die im Bereich der den zweiten Zug 4 bildenden Kanäle 4', und zwar unabhängig davon, ob der Gußkörper oder die Gußkörperteile T von einem Stahlblechmantel 19 umgeben sind (Doppelschaligkeit) oder nicht.5, 6 there would be the possibility of making the base webs 11 'there thicker than those in the region of the channels 4' forming the second train 4, regardless of whether the cast body or the cast body parts T are made by one Sheet steel jacket 19 are surrounded (double shell) or not.

Claims (8)

  1. A three-flue-type boiler comprising a water-carrying housing (1) including a combustion chamber (3) forming the first flue (2) and being provided with discharge openings (5) facing away from the burner and leading to the second flue (4) divided into passageways (4') and comprising the combustion chamber (3), with the third flue (6) also subdivided into passages (6') and also comprising the combustion chamber (3) extending in parallel to the second flue (4),
    characterized in that the passageways (4') ofthe second flue (4) are dimensioned to have cross-sections (Q) decreasing toward the burner side and that the passageways (6') of the third flue (6) provided between the said passageways (4') are dimensioned to have decreasing cross-sections (Q) toward the discharge side, wherein the off-flow cross-sections (7) of the second flue (4) correspond to the in-flow cross-sections (8) of the third flue (6).
  2. A three-flue-type boiler according to claim 1, characterized in that the passageways (4',6') of the flues (4,6) are confined by webs (10) mounted, in a heat-conducting way, on the combustion chamber wall (3') or on an outer jacket (9) confining the passageways (4',6') toward the water side, and that the free ends (10') of the webs (10) are in heat conducting contact with the outer jacket (9) of the combustion chamber wall (3').
  3. A three-flue-type boiler according to claim 2, characterized in that the free ends (10') of the webs (10) are configured in the form of abutting strips (10") cranked toward the outer jacket (9) or toward the combustion chamber wall (3').
  4. A three-flue-type boiler according to claim 1, characterized in that the passageways (4',6') of the flues (4,6) are formed by folds (11) of the combustion chamber wall (3') of U-shaped cross-section or by folds (11) of a wall (12) concentrically surrounding the combustion chamber (3), that the clear faces (13) between the folds (11) are sealed by cover strips (14) and all passageways (4',6') are embraced by an outer jacket (9').
  5. A three-flue-type boiler according to claim 1, characterized in that the passageways (4',6') are formed by profiles (15) mounted on an outer jacket (9) and being of U-shaped cross-section, and that the clear faces (13) between the profiles (15) are sealed by cover strips (16) or by a confining wall (17) facing the side of the combustion chamber or the water side.
  6. A three-flue-type boiler according to claim 1, characterized in that the passageways (4',6') are molded into a cast member (18).
  7. A three-flue-type boiler according to claim 6, characterized in that the cast member (18) is formed of at least two parts (T) axially arranged in series and that the said parts (T) are disposed in a heat conducting way within a steel sheet jacket (19).
  8. A three-flue-type boiler according to claim 4, characterized in that the passageways (6') of the third flue (6) are arranged at the place where the U-shaped folds (11) with the basic webs (11') thereof are in contact with the outer jacket (9).
EP94119802A 1994-01-08 1994-12-15 Three-pass boiler Expired - Lifetime EP0662592B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4400400 1994-01-08
DE4400400A DE4400400A1 (en) 1994-01-08 1994-01-08 Three-pass boiler

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Publication Number Publication Date
EP0662592A1 EP0662592A1 (en) 1995-07-12
EP0662592B1 true EP0662592B1 (en) 1997-07-23

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EP (1) EP0662592B1 (en)
AT (1) ATE155869T1 (en)
DE (2) DE4400400A1 (en)
ES (1) ES2105482T3 (en)

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DE102009046781A1 (en) * 2009-11-17 2011-05-19 J. Eberspächer GmbH & Co. KG Heat exchanger arrangement for use in vehicle heater, has heat transfer ribs extending in peripheral and housing longitudinal axis directions, and arranged at ring-like peripheral wall by plastic deformation

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Also Published As

Publication number Publication date
EP0662592A1 (en) 1995-07-12
DE4400400A1 (en) 1995-07-13
ES2105482T3 (en) 1997-10-16
ATE155869T1 (en) 1997-08-15
DE59403458D1 (en) 1997-08-28

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