EP1600708B1 - Méthode de production d'une chaudière à gaz et une telle chaudière à gaz - Google Patents

Méthode de production d'une chaudière à gaz et une telle chaudière à gaz Download PDF

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Publication number
EP1600708B1
EP1600708B1 EP05104398A EP05104398A EP1600708B1 EP 1600708 B1 EP1600708 B1 EP 1600708B1 EP 05104398 A EP05104398 A EP 05104398A EP 05104398 A EP05104398 A EP 05104398A EP 1600708 B1 EP1600708 B1 EP 1600708B1
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Prior art keywords
length
pipe
axis
fins
casing
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EP05104398A
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German (de)
English (en)
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EP1600708B8 (fr
EP1600708A1 (fr
Inventor
Marco Tagliaferri
Christian Cannas
Noè Ciofolo
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Elbi International SpA
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Riello SpA
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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
    • F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
    • F24H1/43—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes helically or spirally coiled

Definitions

  • the present invention relates to a method of producing a gas boiler and such a boiler.
  • a gas boiler is normally designed to produce hot water for domestic use or for space heating, and comprises a gas burner, and at least one heat exchanger through which the combustion fumes and water flow.
  • Some types of gas boilers known as condensation boilers, condense the steam of the combustion fumes by transferring the latent heat of the fumes to the water.
  • Condensation boilers are further divided into a first and second type. Gas boilers of the first type are normally equipped with a first exchanger close to the burner; and a second exchanger downstream from the first exchanger along the fume path and designed solely for fume condensation.
  • Gas boilers of the second type are equipped with a single heat exchanger which, along a first portion, provides solely for heat exchange, and, along a second portion, in addition to heat exchange, also provides for fume condensation as disclosed in DE 102 42 643 A1 and forming the preamble of claims 1 and 12.
  • Both exchangers for fume only (first type) and dual-function exchangers (second type) comprise a casing extending along a first axis and through which the fumes are conducted; and a pipe along which water flows, and which is coiled into a succession of turns. The fumes flow over and between the turns to transfer heat to the water flowing along the pipe.
  • the coiled pipe has fins extending perpendicularly to the pipe axis.
  • exchanger pipes are normally of complex shapes to enhance heat exchange between the water and fumes, and, at the same time, are made of materials of high thermal conductivity as disclosed in W02004/090434 Al.
  • the complex shape of the pipes makes it difficult to connect the pipes to the water circuit; so much so that, very often, they are welded directly to the water circuit. Welding, in turn, poses practical problems, such as welding cost, and the fact that the weld region in contact with the fumes and possibly also with fume condensate is highly susceptible to corrosive chemical reactions.
  • the present invention also relates to a gas boiler.
  • Boiler 1 is a wall-mounted condensation boiler, i.e. of the type in which the steam in the fumes is condensed, and comprises a heat generating and exchange unit 2, in which are fitted a burner 3 and an exchanger 4; an air/gas mixture feed pipe 5; a fume exhaust pipe 6; and a water circulating circuit 7 defined by substantially circular-section pipes.
  • Unit 2 is substantially cylindrical, extends along a substantially horizontal axis A1, and comprises a casing 8 through which the fumes flow; a finned pipe 9 along which water flows; and a disk 10 for imposing a given fume flow path inside casing 8.
  • Exchanger 4 substantially comprises pipe 9 and casing 8, which also acts as a combustion chamber for burner 3 housed inside casing 8.
  • Casing 8 comprises a cylindrical lateral wall 11 of axis A1; a cover 12 connected to lateral wall 11, to pipe 5, and to burner 3; and a cover 13 connected to lateral wall 11 and to exhaust pipe 6. Covers 12 and 13 have respective openings 14 and 15, through which the ends of pipe 9 are inserted for connection to circuit 7.
  • Burner 3 extends coaxially with casing 8 and for a given length inside cylindrical lateral wall 11, while pipe 9 forms a coil about an axis A2 substantially coincident with axis A1, and comprises a succession of adjacent turns 16, each located close to lateral wall 11.
  • Exchanger 4 also comprises three comb-like spacers 17 (only one shown in Figure 1 ) for keeping turns 16 a given distance apart and for keeping the whole of coiled pipe 9 at a given distance from lateral wall 11.
  • Pipe 9, disk 10, and spacers 17 define inside casing 8 a first central region housing burner 3; a second central region communicating directly with the exhaust pipe; and three lateral regions, each extending between two adjacent spacers 17, turns 16, and lateral wall 11. Combustion of the air-gas mixture takes place in the first central region.
  • the combustion fumes are prevented by disk 10 from flowing directly into the second central region, and flow between turns 16, in a direction D1 substantially perpendicular to axis A1, into the three lateral regions, along which they flow in a direction D2 substantially parallel to axis A1. Once inside the lateral regions, the fumes flow between turns 16 in direction D1 into the second central region and then along exhaust pipe 6.
  • Pipe 9, which is preferably made of aluminium or aluminium alloy, is formed from an extruded pipe length 18 extending along a straight axis A3, as shown in Figure 2 .
  • Pipe length 18 is cut to a length L1 from which to form pipe 9, and comprises a wall 19; two fins 20 on one side of pipe length 18; two fins 21 on the opposite side to fins 20; a fin 22 between fins 20; and a fin 23 between fins 21.
  • the cross section of pipe length 18 is substantially oval, and has a major axis X and a minor axis Y. Fins 20, 21, 22, 23 are all co-extruded with wall 19, are parallel to axis A3 and major axis X, and are therefore parallel to one another.
  • Fins 22 and 23 are coplanar, and lie substantially in the same plane as axis A2 and major axis X. Fins 20 and 21, on the other hand, are located so that each fin 20 is coplanar with an opposite fin 21, and wall 19 of pipe length 18 forms a slight bulge between the coplanar fins 20 and 21.
  • the maximum extension of fins 20 and 21, in a direction parallel to major axis X, is roughly equal to a quarter of the length of major axis X.
  • pipe length 18 is machined to remove fins 20, 21, 22, 23 from two opposite end portions 18a of pipe length 18, to a given length L2 (only one end portion 18a of pipe length 18 is shown in Figures 2 to 10 ).
  • pipe length 18 is then coiled about an axis A2, so that axis A3 of pipe length 18 is also coiled.
  • This operation comprises calendering pipe length 18, while maintaining minor axis Y of the cross section of pipe length 18 substantially parallel to axis A2.
  • the relatively small size of fins 20, 21, 22, 23 does not hinder the calendering operation, and is such that no cutting of fins 20, 21, 22, 23 is required.
  • end portions 18a are bent square so that two endpieces 18b of end portions 18a are parallel to axis A2.
  • each endpiece 18b is worked mechanically to deform it permanently and transform its cross section from substantially oval to circular up to a length L3 smaller than length L2. This is done by placing each endpiece 18b inside a known variable-section die (not shown), and forcing a punch 24 inside endpiece 18b.
  • a bevel 25 is worked mechanically on the outer portion of wall 19 and at the opposite ends of pipe length 18 to remove any flaws or surplus material, thus forming pipe 9 from pipe length 18.
  • the three spacers 17 are then fitted between fins 21 of adjacent turns 16 and spaced 120 degrees apart to form, with pipe 9, an assembly which is inserted inside cylindrical wall 11 of casing 8.
  • axis A2 substantially coincides with axis A1, and turns 16 are maintained a substantially constant distance from wall 11 ( Figure 1 ).
  • Covers 12 and 13 are then fitted onto the opposite ends of cylindrical wall 11, and endpieces 18b of pipe 9 are inserted inside openings 14 and 15.
  • the coil of pipe 9 is of constant pitch and radius, so that fins 20 and 21 of each turn 16 face and are parallel to fins 20 and 21 of the adjacent turns 16, as shown in Figure 1 .
  • a gap is thus formed, which is of constant width at fins 20 and 21, and narrows at the bulge in wall 19.
  • the successive gaps form compulsory fume paths, and, because of their shape, produce a venturi effect, which brings about a sharp acceleration in fume flow and increases turbulence to improve heat exchange.
  • fins 20 and 21 provide for both increasing the exchange surface of pipe 9 and accelerating fume flow and turbulence.
  • each clamp 26 indicates two clamps for securing covers 12 and 13 to cylindrical lateral wall 11.
  • Each clamp 26 comprises an automatic fastener 27 (shown open in Figure 12 ), and has a C-shaped cross section, as shown in Figure 11 .
  • wall 11 comprises two annular ribs 28 at opposite ends.
  • Each cover 12, 13 comprises a portion 29 insertable inside cylindrical lateral wall 11; and an outer portion 30 comprising an annular rib 31, which rests against respective rib 28 to form a seat housing a seal.
  • Each two ribs 28 and 31 are held together by one of clamps 26.
  • opening 15 (and likewise opening 14) is defined by a sleeve 33, the outer end of which has an internal thread.
  • Circuit 7 is connected to unit 2 by means of ring nuts 34, each of which is axially integral with circuit 7, is threaded externally to screw onto sleeve 33, and has a seat 35 housing a seal 36.
  • casing 8 communicates externally to exhaust the fumes, to receive gas and air, and to transfer water solely through covers 12 and 13.
  • Exchanger 4 as described above may also be used in condensation boilers featuring a main exchanger, and wherein exchanger 4 provides solely for condensing the fumes, and does not act as a combustion chamber, as in the example described.
  • Fins 20, 21, 22, 23 provide for increasing both heat exchange and turbulence, and, being parallel to axis A3 of the pipe length, can be extruded easily and, at the same time, can be machined off easily to form fittings.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)

Claims (17)

  1. Méthode de fabrication d'une chaudière à gaz (1) équipée d'un échangeur thermique à eau/vapeurs (4) comprenant une enveloppe (8), qui s'étend le long d'un premier axe (A1), à travers laquelle des vapeurs s'écoulent, et qui est raccordée à un circuit de circulation d'eau (7) ; et un tuyau (9) qui est enroulé autour d'un deuxième axe (A2), comporte des ailettes (20, 21, 22, 23), conduit de l'eau, et est logé à l'intérieur de ladite enveloppe (8) ; la méthode comprenant les étapes consistant à extruder une longueur de tuyau (18) avec des ailettes co-extrudées (20, 21, 22, 23) s'étendant toutes le long d'un troisième axe (A3) ; à couper ladite longueur de tuyau droite (18) d'une longueur égale à une première longueur (L1) pour former ledit tuyau (9), ladite longueur de tuyau (18) possédant lesdites ailettes (20, 21, 22, 23) le long de la totalité de ladite première longueur (L1); et la méthode étant caractérisée en ce que le tuyau est de section transversale ovale et par les étapes consistant à enlever lesdites ailettes (20, 21, 22, 23) de parties d'extrémité opposées (18a) de ladite longueur de tuyau (18) ; chaque partie d'extrémité (18a) s'étendant sur une deuxième longueur (L2) ; et à déformer chaque partie d'extrémité (18a) de façon permanente pour donner une forme circulaire à la section transversale à des extrémités opposées et sur une troisième longueur (L3) inférieure à la deuxième longueur (L2).
  2. Méthode selon la revendication 1, caractérisée par l'étape consistant à enlever lesdites ailettes (20, 21, 22, 23) par usinage.
  3. Méthode selon la revendication 2, caractérisée par l'étape consistant à couder chaque partie d'extrémité (18a) de façon carrée à ce qu'une pièce d'extrémité (18b) de ladite partie d'extrémité (18a) soit parallèle audit deuxième axe (A2).
  4. Méthode selon une quelconque des revendications précédentes, caractérisée par l'étape consistant à déformer lesdites parties d'extrémité (18a) au moyen d'un poinçon (24) forcé dans lesdites parties d'extrémité (18a) sur ladite troisième longueur (L3).
  5. Méthode selon une quelconque des revendications précédentes, caractérisée en ce que ladite longueur de tuyau (18) comprend une paroi (19) ; la méthode comprenant l'étape consistant à former un biseau extérieur (25) sur ladite paroi (19) aux extrémités de la longueur de tuyau (18).
  6. Méthode selon la revendication 5, caractérisée en ce que ladite enveloppe (8) comprend une paroi latérale cylindrique (11), un premier couvercle (12), et un deuxième couvercle (13) ; la méthode comprenant les étapes consistant à insérer le tuyau enroulé (9) à l'intérieur de ladite paroi latérale cylindrique (11), et fermer ladite enveloppe (8) au moyen des premier et deuxième couvercles (12, 13).
  7. Méthode selon la revendication 6, caractérisée par l'étape consistant à fixer les premier et deuxième couvercles (12, 13) à ladite paroi latérale cylindrique (11) au moyen de dispositifs de serrage respectifs (26).
  8. Méthode selon la revendication 6 ou 7, caractérisée en ce que les premier et deuxième couvercles (12, 13) comportent des ouvertures respectives (14, 15) ; la méthode comprenant l'étape consistant à insérer lesdites parties d'extrémité (18a) au moins partiellement à l'intérieur desdites ouvertures (14, 15).
  9. Méthode selon une quelconque des revendications précédentes, caractérisée par l'étape consistant à raccorder chacune desdites parties d'extrémité (18a) au circuit de circulation d'eau (7) au moyen d'un accouplement.
  10. Méthode selon la revendication 1, caractérisée en ce que ladite enveloppe (8) comprend une paroi latérale cylindrique (11), et deux couvercles (12, 13) à des extrémités opposées de la paroi latérale cylindrique (11) ; ladite enveloppe (8) communiquant avec l'extérieur pour faire sortir les vapeurs, pour recevoir du gaz et de l'air, et pour transférer de l'eau seulement à travers lesdits couvercles (12, 13).
  11. Chaudière à gaz (1) équipée d'un échangeur thermique à eau/vapeurs (4) raccordé à un circuit de circulation d'eau (7) ; la chaudière comprenant une enveloppe (8), qui s'étend le long d'un premier axe (A1) et à travers laquelle des vapeurs s'écoulent ; et un tuyau extrudé (9) qui est enroulé autour d'un deuxième axe (A2), comporte des ailettes co-extrudées (20, 21, 22, 23), conduit de l'eau, et est logé à l'intérieur de ladite enveloppe (8) ; ledit tuyau (9) est formé à partir d'une longueur de tuyau droite (18) s'étendant le long d'un troisième axe (A3) et possédant lesdites ailettes (20, 21, 22, 23) le long de la totalité de sa longueur égale à une première longueur (L1); la chaudière à gaz étant caractérisée en ce que le tuyau (9) est de section transversale ovale ; lesdites ailettes (20, 21, 22, 23) étant enlevées de parties d'extrémité opposées (18a) de ladite longueur de tuyau (18) ; et chaque partie d'extrémité (18a) s'étendant sur une deuxième longueur (L2) et possédant une pièce d'extrémité (18b) le long de laquelle deux parties d'extrémité respectives possèdent une section transversale sensiblement circulaire sur une troisième longueur (L3) inférieure à la deuxième longueur (L2).
  12. Chaudière selon la revendication 11, caractérisée en ce que lesdites pièces d'extrémité (18b) sont parallèles audit deuxième axe (A2).
  13. Chaudière selon la revendication 11 ou 12, caractérisée en ce que ladite enveloppe (8) comprend une paroi latérale cylindrique (11), et des premier et deuxième couvercles (12, 13) à des extrémités opposées de ladite paroi latérale cylindrique (11) ; le tuyau (9) étant logé à l'intérieur de ladite paroi latérale cylindrique (11) et supporté par des entretoises (17) pour que le premier axe (A1) coïncide sensiblement avec le deuxième axe (A2).
  14. Chaudière selon les revendications 12 et 13, caractérisée en ce que lesdits couvercles (12, 13) comportent des ouvertures respectives (14, 15) ; lesdites pièces d'extrémité (18b) étant insérées à l'intérieur desdites ouvertures (14, 15).
  15. Chaudière selon la revendication 14, caractérisée en ce que chaque couvercle (12 ; 13) comprend un manchon (33) définissant une ouverture respective (14, 15) ; ledit manchon (33) possédant un filet interne coopérant avec un écrou à oeil (34) intégré de façon axiale avec le circuit de circulation d'eau (7).
  16. Chaudière selon une des revendications 13 à 15, caractérisée en ce que lesdits couvercles (12, 13) sont fixés à ladite paroi latérale cylindrique (11) au moyen de dispositifs de serrage respectifs (26).
  17. Chaudière selon la revendication 16, caractérisée en ce que ladite paroi latérale cylindrique (11) comprend deux premières nervures annulaires (28) à ses extrémités opposées ; et lesdits couvercles (12, 13) comprennent des deuxièmes nervures annulaires respectives (31) fixées aux premières nervures annulaires (28) au moyen desdits dispositifs de serrage (26) ; chaque dispositif de serrage (26) possédant une section transversale en forme de C pour loger une première et une deuxième nervure annulaire (28, 31).
EP05104398A 2004-05-25 2005-05-24 Méthode de production d'une chaudière à gaz et une telle chaudière à gaz Active EP1600708B8 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05104398T PL1600708T3 (pl) 2004-05-25 2005-05-24 Sposób wytwarzania kotła gazowego oraz tak wytwarzany kocioł gazowy

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20041044 2004-05-25
IT001044A ITMI20041044A1 (it) 2004-05-25 2004-05-25 Metodo di realizzazione di una caldaia a gas e caldaia a gas cosi'ottenuta

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EP1600708A1 EP1600708A1 (fr) 2005-11-30
EP1600708B1 true EP1600708B1 (fr) 2011-04-13
EP1600708B8 EP1600708B8 (fr) 2011-08-10

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EP (1) EP1600708B8 (fr)
CN (1) CN100458303C (fr)
AT (1) ATE505692T1 (fr)
DE (1) DE602005027420D1 (fr)
ES (1) ES2364557T3 (fr)
IT (1) ITMI20041044A1 (fr)
PL (1) PL1600708T3 (fr)

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Publication number Priority date Publication date Assignee Title
US8028746B2 (en) 2007-02-05 2011-10-04 Elbi International S.P.A. Heat exchanger with finned tube and method of producing the same
CN100449220C (zh) * 2007-03-06 2009-01-07 成都前锋热交换器有限责任公司 冷凝式热交换器
TWI404903B (zh) * 2007-03-09 2013-08-11 Sulzer Chemtech Ag 用於流體媒介物熱交換及混合處理之設備
ES2553758T3 (es) 2009-06-05 2015-12-11 Elbi International S.P.A. Caldera de gas, en particular caldera de gas de condensación para producir agua caliente
IT1399368B1 (it) 2010-04-08 2013-04-16 Riello Spa Scambiatore di calore e metodo per realizzare tale scambiatore di calore
ITMI20100590A1 (it) 2010-04-08 2011-10-09 Riello Spa Scambiatore di calore per riscaldare almeno due liquidi e metodo per realizzare tale scambiatore di calore
IT1406469B1 (it) * 2010-04-13 2014-02-28 Riello Spa Scambiatore di calore per riscaldare un liquido tramite fumi di combustione.
IT1399499B1 (it) 2010-04-13 2013-04-19 Riello Spa Metodo per realizzare uno scambiatore di calore e scambiatore di calore realizzato con tale metodo.
IT1401312B1 (it) * 2010-08-05 2013-07-18 Riello Spa Scambiatore di calore provvisto di un dispositivo termofotovoltaico
IT1401959B1 (it) 2010-09-23 2013-08-28 Riello Spa Scambiatore di calore condensante per una caldaia a gas.
ITUB20153465A1 (it) 2015-09-08 2017-03-08 Riello Spa Scambiatore di calore per riscaldare acqua in una caldaia domestica o in uno scaldabagno
ITUB20153485A1 (it) 2015-09-08 2017-03-08 Riello Spa Scambiatore di calore per una caldaia domestica o uno scaldacqua
ITUB20153466A1 (it) 2015-09-08 2017-03-08 Riello Spa Scambiatore di calore per una caldaia domestica o uno scaldacqua
CN105650636A (zh) * 2016-02-03 2016-06-08 浙江广涛卫厨有限公司 一种燃烧器热交换器总成
IT201600074665A1 (it) * 2016-07-18 2018-01-18 Ariston Thermo Spa Scambiatore di calore per caldaia o simili
IT201800010317A1 (it) * 2018-11-14 2020-05-14 Condevo S P A Cella di scambio termico

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EP1143206A3 (fr) * 2000-04-03 2003-05-02 VTH Verfahrentechnik für Heizung AG Echangeur de chaleur pour chaudière ou chauffe-eau instantané
AT411622B (de) * 2001-06-25 2004-03-25 Vaillant Gmbh Heizgerät mit einer brennkammer
DE10136441A1 (de) * 2001-07-26 2003-02-13 Bosch Gmbh Robert Wärmetauscher für ein Gasheizgerät, insbesondere ein Brennwertgerät
ITRM20010474A1 (it) * 2001-08-03 2003-02-03 Fontecal S P A Scambiatore spiroidale ad alto rendimento per riscaldamento e/o produzione di acqua calda sanitaria, particolarmente adatto alla condensazio
ITMI20030769A1 (it) * 2003-04-11 2004-10-12 Riello Spa Scambiatore di calore, metodo di realizzazione di tale scambiatore e caldaia comprendente tale scambiatore.

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Publication number Priority date Publication date Assignee Title
DE10242643A1 (de) * 2002-09-13 2004-03-25 Heatec Thermotechnik Gmbh Warmwassererzeuger, insbesondere für Heizzwecke

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Publication number Publication date
DE602005027420D1 (de) 2011-05-26
ITMI20041044A1 (it) 2004-08-25
PL1600708T3 (pl) 2011-10-31
EP1600708B8 (fr) 2011-08-10
ATE505692T1 (de) 2011-04-15
CN100458303C (zh) 2009-02-04
ES2364557T3 (es) 2011-09-06
EP1600708A1 (fr) 2005-11-30
CN1702396A (zh) 2005-11-30

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