EP0192564A1 - Silent action gas-fired hermetically closed modulating condensing boiler - Google Patents

Silent action gas-fired hermetically closed modulating condensing boiler Download PDF

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Publication number
EP0192564A1
EP0192564A1 EP86400302A EP86400302A EP0192564A1 EP 0192564 A1 EP0192564 A1 EP 0192564A1 EP 86400302 A EP86400302 A EP 86400302A EP 86400302 A EP86400302 A EP 86400302A EP 0192564 A1 EP0192564 A1 EP 0192564A1
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EP
European Patent Office
Prior art keywords
basket
box
gas boiler
exchanger
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.)
Withdrawn
Application number
EP86400302A
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German (de)
French (fr)
Inventor
René Granier
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.)
Saunier Duval Eau Chaude Chauffage SDECC SA
Original Assignee
Saunier Duval Eau Chaude Chauffage SDECC SA
Priority date (The priority date 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 date listed.)
Filing date
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Application filed by Saunier Duval Eau Chaude Chauffage SDECC SA filed Critical Saunier Duval Eau Chaude Chauffage SDECC SA
Publication of EP0192564A1 publication Critical patent/EP0192564A1/en
Withdrawn legal-status Critical Current

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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
    • F24H9/00—Details
    • F24H9/02—Casings; Cover lids; Ornamental panels
    • 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
    • F24H2203/00—** to be deleted **

Definitions

  • the invention relates to a modulating domestic hot water central heating boiler of the waterproof condensing boiler type, equipped with a burner with blown air-gas premix, and particularly relates to a device making it possible to obtain an .ilpncieux operation of the device, in all circumstances.
  • the burner is arranged inside an exchanger formed by a cylindrical layer of water tubes through which the heat exchanges are carried out by the passage of radially emitted combustion gases.
  • the exchanger-burner assembly is itself housed in a sealed chamber made up of a molded box whose base has the shape of an egg and whose generator is a straight line slightly inclined on the vertical. This box is hermetically sealed at its upper part by a stainless steel plate pierced with a hole through which the combustion products collected in this box can escape.
  • This assembly which has the advantage of being very compact, can have the drawback of being noisy, in particular when the burner is ignited. Indeed, at the outlet of the latter, the air-gas mixture is locally ignited by means of a spark, and the flame propagates in the entire combustible mixture. This propagation generates an overpressure wave inside the sealed envelope due to the sudden expansion of the volume of the combustion products, which expansion takes place with high temperature gradients. In addition, this overpressure wave generates vibrations of audible frequency which are reflected on the walls of the sealed chamber as well as on the flame front, thereby maintaining a continuous noise of intensity all the higher as the front is from a turbulent mixture.
  • the invention proposes a solution which avoids the drawbacks specific to these various known systems in that it uses a means intended to selectively attenuate each of the frequencies emitted inside the sealed box enveloping the exchanger burner assembly, with possibly a additional damping means capable of eliminating any residual noise created by instabilities or disturbances in the gas flows.
  • the means intended for the selective attenuation of the frequencies consists of a perforated plate having there the shape of a basket surrounding the exchanger, the pitch and the diameter of the perforations as well as the interstitial space 1 between the box and the basket are determined to each constitute a resonant cavity in parallel with all the others.
  • the means intended for the selective attenuation of the frequencies consists of a perforated plate having the shape of a basket surrounding the exchanger, the pitch and diameter of the perforations are regular and constant and associated with an additional damping means consisting of a plastic foam mattress wrapping the basket inside the box.
  • This box 1 having a generally oblong shape is closed at its upper part by a cover (not shown) provided with an orifice for the exhaust of the combustion products. It contains an exchanger formed by a cylindrical layer of water tubes 2 connected at their lower part and above a circular collector 3. These tubes are traversed towards the outside by the combustion gases emitted by a central burner not shown; they are collected by the box forming a shell, then evacuated outside.
  • a perforated plate in the form of a basket 4 surrounds the exchanger.
  • This basket is provided with a bottom having an oval cut homothetic to that of the box 1 and with a vertical wall welded on the edge of this bottom and rising substantially up to the level of the upper part of the water tubes. 2.
  • the pitch and the diameter of the perforations 5 of the basket are regular and constant.
  • the basket rests on the bottom of the box by means of balusters not shown.
  • a polyurethane foam is preferably used to make this mattress, the internal face of which is also molded to form pins 7, staggered, particularly effective in absorbing the acoustic energy dissipated by the exchanger.
  • a shock-absorbing mattress between the bottom of the basket 4 and the bottom of the box 1, to prevent the latter from being impregnated with water coming from the condensates.
  • a waterproof fabric 8 resistant to heat and acids. This fabric 8 is pierced under the base of the basket with a hole allowing the condensates to flow onto the bottom of the box 1 from where they are discharged by means of a siphon 9.

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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)
  • Details Of Fluid Heaters (AREA)

Abstract

The invention relates to gas-fired boilers. In order to attenuate the frequencies emitted on the inside of the hermetically closed box (1) surrounding the burner/exchanger assembly, a perforated plate with the shape of a basket (4) is provided, the perforations of which are regular and constant, and, on the outside of this basket, in the space provided between it and the box, a plastic foam mattress is positioned, which is capable of eliminating the residual noise created by the perturbations in the gaseous flows. Application in hermetically closed condensing boilers. <IMAGE>

Description

L'invention se rapporte à une chaudière domestique modulante de chauffage central à eau chaude du genre chaudière étanche à condensation, équipée d'un brûleur à prémélange air-gaz soufflé,et concerne particulièrement un dispositif permettant d'obtenir un fonctionnement .ilpncieux de l'appareil, en toutes circonstances.The invention relates to a modulating domestic hot water central heating boiler of the waterproof condensing boiler type, equipped with a burner with blown air-gas premix, and particularly relates to a device making it possible to obtain an .ilpncieux operation of the device, in all circumstances.

Dans ce type de chaudière, telle que décrite dans la demande de brevet 82 16 664 au nom de la demanderesse, le brûleur est disposé à l'intérieur d'un échangeur formé d'une nappe cylindrique de tubes d'eau au travers desquels les échanges thermiques s'effectuent par le passage des gaz de combustion émis radialement. L'ensemble échangeur-brûleur est lui-même logé dans une chambre étanche constituée d'une boîte venue de moulage dont la base a la forme d'un oeuf et dont la génératrice est une droite légèrement inclinée sur la verticale. Cette boîte est fermée hermétiquement à sa partie supérieure par une plaque en acier inoxydable percée d'un trou par lequel les produits de combustion recueillis dans cette boîte peuvent s'échapper.In this type of boiler, as described in patent application 82 16 664 in the name of the applicant, the burner is arranged inside an exchanger formed by a cylindrical layer of water tubes through which the heat exchanges are carried out by the passage of radially emitted combustion gases. The exchanger-burner assembly is itself housed in a sealed chamber made up of a molded box whose base has the shape of an egg and whose generator is a straight line slightly inclined on the vertical. This box is hermetically sealed at its upper part by a stainless steel plate pierced with a hole through which the combustion products collected in this box can escape.

Cet ensemble qui a l'avantage d'être très compact, peut présenter l'inconvénient d'être bruyant notamment au moment de l'allumage du brûleur. En effet, à la sortie de ce dernier, le mélange air-gaz est enflammé localement par l'intermédiaire d'une étincelle, et la flamme se propage dans le mélange combustible tout entier. Cette propagation engendre une onde de surpression à l'intérieur de l'enveloppe étanche en raison de l'expansion brutale du volume des produits de combustion, expansion qui s'effectue avec des gradients de température élevés. De plus cette onde de surpression génère des vibrations de fréquence audible qui se réfléchissent sur les parois de la chambre étanche ainsi que sur le front de flamme, entretenant par là-même un bruit continu d'intensité d'autant plus élevée que le front est issu d'un mélange turbulent.This assembly, which has the advantage of being very compact, can have the drawback of being noisy, in particular when the burner is ignited. Indeed, at the outlet of the latter, the air-gas mixture is locally ignited by means of a spark, and the flame propagates in the entire combustible mixture. This propagation generates an overpressure wave inside the sealed envelope due to the sudden expansion of the volume of the combustion products, which expansion takes place with high temperature gradients. In addition, this overpressure wave generates vibrations of audible frequency which are reflected on the walls of the sealed chamber as well as on the flame front, thereby maintaining a continuous noise of intensity all the higher as the front is from a turbulent mixture.

Pour éviter ces bruits et annuler les résonances sans dissipation d'énergie, on connaît des systèmes utilisant des tuyaux antirésonnants ou insérant dans le circuit d'écoulement des cavités résonnantes ou résonateurs d'Helmholtz. Mais pour couvrir toute la gamme de fre- quences, les tuyaux quart d'onde antirésonnants deviennent encombrants et les résonateurs devraient être nombreux.To avoid these noises and cancel the resonances without dissipating energy, systems are known which use anti-resonant pipes or which insert resonant cavities or Helmholtz resonators into the flow circuit. But to cover the whole frequency range, the anti-resonant quarter-wave pipes become bulky and the resonators should be numerous.

Une autre solution connue pour éviter ces bruits consiste à remplacer la paroi rigide de cette dernière par une paroi souple comme décrit dans la demande de brevet n° 80 23 288 au nom de la demanderesse. La déformation de cette paroi absorbe l'énergie acoustique, mais la réalisation d'une enceinte de ce type pose néanmoins d'autres problèmes de résistance à la chaleur et à la pression.Another known solution for avoiding these noises consists in replacing the rigid wall of the latter by a flexible wall as described in patent application No. 80 23 288 in the name of the applicant. The deformation of this wall absorbs acoustic energy, but the production of an enclosure of this type nevertheless poses other problems of resistance to heat and to pressure.

L'invention propose une solution qui évite les inconvénients propres à ces divers systèmes connus en ce qu'elle utilise un moyen destiné à atténuer sélectivement chacune des fréquences émises à l'intérieur de la boite étanche enveloppant l'ensemble brûleur échangeur, avec éventuellement un moyen complémentaire d'amortissement apte à éliminer tout bruit résiduel créé par les instabilités ou perturbations dans les écoulements gazeux.The invention proposes a solution which avoids the drawbacks specific to these various known systems in that it uses a means intended to selectively attenuate each of the frequencies emitted inside the sealed box enveloping the exchanger burner assembly, with possibly a additional damping means capable of eliminating any residual noise created by instabilities or disturbances in the gas flows.

Selon l'invention,le moyen destiné à l'atténuation sélective des fréquences est constitué d'une plaque perforée ayant là forme d'un panier entourant l'échangeur, dont le pas et le diamètre des perforations ainsi que l'espace interstici 1 entre la boite et le panier sont déterminés pour constituer chacune une cavité résonnante en parallèle avec toutes les autres.According to the invention, the means intended for the selective attenuation of the frequencies consists of a perforated plate having there the shape of a basket surrounding the exchanger, the pitch and the diameter of the perforations as well as the interstitial space 1 between the box and the basket are determined to each constitute a resonant cavity in parallel with all the others.

Selon une autre caractéristique de l'invention, le moyen destiné à l'atténuation sélective des fréquences est constitué d'une plaque perforée ayant la forme d'un panier entourant l'échangeur, dont le pas et le diamètre des perforations sont réguliers et constants et associé à un moyen complémentaire d'amortissement constitué d'un natelas en mousse plastique enveloppant le panier à l'intérieur de la boite.According to another characteristic of the invention, the means intended for the selective attenuation of the frequencies consists of a perforated plate having the shape of a basket surrounding the exchanger, the pitch and diameter of the perforations are regular and constant and associated with an additional damping means consisting of a plastic foam mattress wrapping the basket inside the box.

Les caractéristiques particulières et avantages de l'invention apparaîtront à la lecture de la description suivante d'une forme de réalisation prise à titre d'exemple en référence au dessin annexé qui représente une vue en perspective de la boîte formant la chambre étanche.The particular characteristics and advantages of the invention will appear on reading the following description of an embodiment taken by way of example with reference to the appended drawing which represents a perspective view of the box forming the sealed chamber.

Cette boîte 1 ayant une forme générale oblongue est fermée à sa partie supérieure par un couvercle non représenté muni d'un orifice pour l'échappement des produits de combustion. Elle renferme un échangeur formé d'une nappe cylindrique de tubes d'eau 2 reliés à leur partie inférieure et supérieure à un collecteur circulaire 3. Ces tubes sont traversés vers l'extérieur par les gaz de combustion émis par un brûleur central non représenté; ils sont reccueillis par la boîte formant une coquille, puis évacués à l'extérieur.This box 1 having a generally oblong shape is closed at its upper part by a cover (not shown) provided with an orifice for the exhaust of the combustion products. It contains an exchanger formed by a cylindrical layer of water tubes 2 connected at their lower part and above a circular collector 3. These tubes are traversed towards the outside by the combustion gases emitted by a central burner not shown; they are collected by the box forming a shell, then evacuated outside.

Une plaque perforée ayant la forme d'un panier 4 entoure l'échangeur. Ce panier est muni d'un fond ayant une découpe ovale homothétique de celle de la boîte 1 et d'une paroi verticale soudée sur le bord de ce fond et s'élevant sensiblement jusqu'au niveau de la partie supérieure des tubes d'eau 2. Le pas et le diamètre des perforations 5 du panier sont réguliers et constants. Le panier repose sur le fond de la boîte par l'intermédiaire de colonnettes non représentées. Entre la boîte 1 et le panier 4, est prévu un espace intersticiel suffisant pour y loger, seulement sur le pourtour et pas sur le fond, un matelas 6 en mousse plastique jouant le rôle d'amortisseur, dont les caractéristiques de porosité et d'orientation des pores ont été sélectionnés.A perforated plate in the form of a basket 4 surrounds the exchanger. This basket is provided with a bottom having an oval cut homothetic to that of the box 1 and with a vertical wall welded on the edge of this bottom and rising substantially up to the level of the upper part of the water tubes. 2. The pitch and the diameter of the perforations 5 of the basket are regular and constant. The basket rests on the bottom of the box by means of balusters not shown. Between the box 1 and the basket 4, there is provided an interstitial space sufficient to accommodate therein, only on the periphery and not on the bottom, a plastic foam mattress 6 acting as a shock absorber, the characteristics of which are porosity and pore orientation were selected.

C'est ainsi que l'on utilise préférentiellement une mousse de polyuréthane pour réaliser ce matelas dont la face interne est en outre moulée pour former des picots 7, répartis en quinconce, particulièrement efficaces pour absorber l'énergie acoustique dissipée par l'échangeur. Il n'est cependant pas prévu de matelas amortisseur entre le fond du panier 4 et le fond de la boîte 1, pour éviter que celui-ci ne soit imprégné par l'eau provenant des condensats. Néanmoins pour éviter que cela ne se produise cependant pour le matelas 6 autour du panier 4, on prévoit d'habiller ce dernier d'un tissu étanche 8, résistant à la chaleur et aux acides. Ce tissu 8 est percé sous la base du panier d'un trou permettant aux condensats de s'écouler sur le fond de la boîte 1 d'où ils sont évacués par l'intermédiaire d'un siphon 9. Cet habillage joue à la fois le rôle d'amortisseur et de séparateur étanche. Le panier ainsi habillé constitue un conduit étanche suffisamment grand pour que les gaz de combustion s'écoulent librement. La solution ainsi présentée combine donc l'avantage des cavités résonnantes, bien adaptées aux fréquences émises, avec l'avantage d'un amortissement visqueux destiné à élargir un champ d'action trop étroit en fréquence des cavités résonnantes.In this way, a polyurethane foam is preferably used to make this mattress, the internal face of which is also molded to form pins 7, staggered, particularly effective in absorbing the acoustic energy dissipated by the exchanger. However, there is no provision for a shock-absorbing mattress between the bottom of the basket 4 and the bottom of the box 1, to prevent the latter from being impregnated with water coming from the condensates. However to prevent this from happening however for the mattress 6 around the basket 4, provision is made to cover the latter with a waterproof fabric 8, resistant to heat and acids. This fabric 8 is pierced under the base of the basket with a hole allowing the condensates to flow onto the bottom of the box 1 from where they are discharged by means of a siphon 9. This covering acts at the same time the role of damper and watertight separator. The basket thus dressed constitutes a tight conduit large enough for the combustion gases to flow freely. The solution thus presented therefore combines the advantage of resonant cavities, well adapted to the frequencies emitted, with the advantage of viscous damping intended to widen a too narrow field of action in frequency of resonant cavities.

Claims (6)

1°/ Chaudière à gaz modulante du type étanche à condensation comportant un échangeur formé d'une nappe cylindrique de tubes d'eau placé à l'intérieur d'une boite étanche de forme oblongue formant coquille de récupération des gaz de combustion émis par un brûleur central, caractérisé par le fait qu'on intercale entre l'échangeur (3) et la boîte (1) au moins une pièce intermédiaire (4) conçue pour atténuer sélectivement chacune des fréquences sonores émises à l'intérieur de la boite, ainsi qu'un moyen complémentaire d'amortissement (5,6) pour l'élimination de bruits résiduels.1 ° / Modulating gas boiler of the sealed condensation type comprising an exchanger formed by a cylindrical sheet of water tubes placed inside a sealed oblong box forming a shell for recovering the combustion gases emitted by a central burner, characterized in that at least one intermediate piece (4) is inserted between the exchanger (3) and the box (1) designed to selectively attenuate each of the sound frequencies emitted inside the box, thus an additional damping means (5,6) for the elimination of residual noise. 2°/ Chaudière à gaz selon la revendication 1, caractérisée par le fait que la pièce intermédiaire est une plaque perforée (4) ayant la forme d'un panier entourant l'échangeur, dont le pas et le diamètre des perforations sont déterminés pour constituer chacune une cavité résonnante en parallèle avec les autres.2 ° / gas boiler according to claim 1, characterized in that the intermediate piece is a perforated plate (4) having the shape of a basket surrounding the exchanger, the pitch and the diameter of the perforations are determined to constitute each a resonant cavity in parallel with the others. 3°/ Chaudière à gaz selon la revendication 1, caractérisée par le fait que la pièce intermédiaire est une plaque perforée (4) ayant la forme d'un panier entourant l'échangeur, dont le pas et le diamètre des perforations(5)sont réguliers et constants et que le moyen complémentaire d'amortissement est constitué d'un matelas (6) en mousse plastique placé autour du panier à l'intérieur de la boite.3 ° / gas boiler according to claim 1, characterized in that the intermediate piece is a perforated plate (4) having the shape of a basket surrounding the exchanger, the pitch and the diameter of the perforations (5) are regular and constant and that the additional damping means consists of a plastic foam mattress (6) placed around the basket inside the box. 4°/ Chaudière à gaz selon la revendication 2 caractérisée par le fait que le panier (4) est muni d'un fond ayant une découpe ovale homothétique de celle de la boite (1), et d'une paroi verticale soudée sur le bord de ce fond et s'élevant sensiblement jusqu'au niveau de la partie supérieure des tubes d'eau (2).4 ° / gas boiler according to claim 2 characterized in that the basket (4) is provided with a bottom having an oval cutout similar to that of the box (1), and a vertical wall welded to the edge from this bottom and rising substantially up to the level of the upper part of the water tubes (2). 5°/ Chaudière à gaz selon la revendication 3 caractérisée par le fait que le matelas (6) présente une face intérieure munie de picots (7), répartis en quinconce.5 ° / gas boiler according to claim 3 characterized in that the mattress (6) has an inner face provided with pins (7), staggered. 6°/ Chaudière à gaz selon les revendications 1 et 3 caractérisée par le fait qu'un tissu (8) muni d'un trou à sa base enveloppe le panier (4).6 ° / gas boiler according to claims 1 and 3 characterized in that a fabric (8) provided with a hole at its base envelops the basket (4).
EP86400302A 1985-02-13 1986-02-12 Silent action gas-fired hermetically closed modulating condensing boiler Withdrawn EP0192564A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8502024A FR2577309B1 (en) 1985-02-13 1985-02-13 MODULATING GAS BOILER OF THE WATERPROOF TYPE CONDENSING, WITH QUIET OPERATION.
FR8502024 1985-02-13

Publications (1)

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EP0192564A1 true EP0192564A1 (en) 1986-08-27

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EP86400302A Withdrawn EP0192564A1 (en) 1985-02-13 1986-02-12 Silent action gas-fired hermetically closed modulating condensing boiler

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EP (1) EP0192564A1 (en)
JP (1) JPS61190204A (en)
ES (1) ES8800749A1 (en)
FR (1) FR2577309B1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3103987A (en) * 1960-08-31 1963-09-17 Koppers Co Inc Acoustical panel construction
BE656022A (en) * 1963-11-21 1965-05-20
EP0051516A1 (en) * 1980-10-31 1982-05-12 SAUNIER DUVAL EAU CHAUDE CHAUFFAGE S.D.E.C.C. - Société anonyme Tight chamber of a heat exchanger with a mantle consisting of straight water pipes arranged concentrically around a central burner
EP0105805A1 (en) * 1982-10-05 1984-04-18 SAUNIER DUVAL EAU CHAUDE CHAUFFAGE S.D.E.C.C. - Société anonyme Air-tight heater assembly with forced draft

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3103987A (en) * 1960-08-31 1963-09-17 Koppers Co Inc Acoustical panel construction
BE656022A (en) * 1963-11-21 1965-05-20
EP0051516A1 (en) * 1980-10-31 1982-05-12 SAUNIER DUVAL EAU CHAUDE CHAUFFAGE S.D.E.C.C. - Société anonyme Tight chamber of a heat exchanger with a mantle consisting of straight water pipes arranged concentrically around a central burner
EP0105805A1 (en) * 1982-10-05 1984-04-18 SAUNIER DUVAL EAU CHAUDE CHAUFFAGE S.D.E.C.C. - Société anonyme Air-tight heater assembly with forced draft

Also Published As

Publication number Publication date
ES551750A0 (en) 1987-12-01
FR2577309A1 (en) 1986-08-14
ES8800749A1 (en) 1987-12-01
FR2577309B1 (en) 1987-04-17
JPS61190204A (en) 1986-08-23

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