EP2921777A1 - Dispositif de bruleur a pre melange gaz - Google Patents

Dispositif de bruleur a pre melange gaz Download PDF

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Publication number
EP2921777A1
EP2921777A1 EP15159682.2A EP15159682A EP2921777A1 EP 2921777 A1 EP2921777 A1 EP 2921777A1 EP 15159682 A EP15159682 A EP 15159682A EP 2921777 A1 EP2921777 A1 EP 2921777A1
Authority
EP
European Patent Office
Prior art keywords
gas
fan
air
movable part
depression
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.)
Granted
Application number
EP15159682.2A
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German (de)
English (en)
Other versions
EP2921777B1 (fr
Inventor
Yves Cazard
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.)
Yahtec
Original Assignee
Yahtec
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Filing date
Publication date
Priority claimed from FR1452252A external-priority patent/FR3018899A1/fr
Application filed by Yahtec filed Critical Yahtec
Publication of EP2921777A1 publication Critical patent/EP2921777A1/fr
Application granted granted Critical
Publication of EP2921777B1 publication Critical patent/EP2921777B1/fr
Active legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
    • F23D14/36—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air in which the compressor and burner form a single unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F23D14/64—Mixing devices; Mixing tubes with injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/027—Regulating fuel supply conjointly with air supply using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N5/188—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/00003—Fuel or fuel-air mixtures flow distribution devices upstream of the outlet

Definitions

  • the present invention relates to a gas premix burner device.
  • a pre-mixed gas burner device operates with constant air / gas ratio, it includes a venturi which creates a vacuum on the gas valve. This depression is greater or less depending on the power required.
  • Such a device however has a disadvantage, knowing that the depression evolves squared of the flow, it is difficult to obtain a sufficient vacuum signal when reducing the flow rate beyond 5. Indeed, when the flow is divided by 5, the depression is divided by 25.
  • the present invention aims to solve the aforementioned drawback without using a control or all external energy sources.
  • the gas premix burner device comprises a suction fan of the air / gas mixture, a gas supply valve, a gas injector, and a Venturi interposed between said injector and said fan so as to create a depression on said gas valve, and it is characterized in that said comprises a movable part, adapted to move under the action of said fan and a return spring, the displacement of said movable part being able to modify the sections of the gas and air passages.
  • the moving part comprises a flat wall capable of being subjected to the depression exerted by the fan, and comprising, on its side opposite to that subjected to said depression, projecting elements, suitable for insert into openings that includes a body in which is guided in moving said movable part and which are connected with means for supplying gas or air, the cooperation of said projecting elements with said openings being made through conical surfaces, so that the insertion depth of said projecting elements in said openings makes it possible to modify the dimensions of the passages, and thus to modulate the flow rates.
  • the gas pre-mixing burner device comprises a centrifugal fan 1 for suction of the air / gas mixture AG, a gas control solenoid valve 2 controlled by a motor M, a gas injector 3 and a venturi 4.
  • the venturi 4 which is also represented on the figure 2 , comprises, facing the fan 1, a part 40, or piston, movable under the effect of depression generated by the fan 1, which is adapted, depending on its position in the venturi 4, to change the section of the passages 41 gas G and 42 air A.
  • the venturi 4 comprises two parts, in addition to the moving part or piston 40, a body 5 comprising three concentric tubular parts, internal 50, external 51, and intermediate 52.
  • the concentric intermediate 52 and outer 51 tubular portions are interconnected by material bridges 53, so as to provide a tubular space 54.
  • the concentric intermediate 52 and inner 50 tubular portions, for their part are joined by an end wall 55 only centrally pierced with a hole 56 opening into the inner tubular portion 50.
  • the part 40 comprises a flat wall 44 peripherally bordered and on one side, a wall 45 intended to be inserted in the space 54, and which has a tubular face 46 of a diameter allowing it a narrow insertion without wedging in the outer tubular portion 5, and on the inner side a face 47 of generally frustoconical shape, whose thickness at the base, on the side of the flat wall 44, is greater than the width of the space 54.
  • the piece 40 is thus movable axially in the outer tubular portion 51, guided by the inner face thereof, while the insertion depth of the wall 45 in the space 54, due to the obliquity of the face 47 , modulates the size of the passage 42 between the space 54 and the space defined by the walls 44 and 55, until possibly closing this passage. It will be noted that abutments 57 are interposed between the walls 44 and 55.
  • the part 40 has centrally an axis 48 introduced into the hole 56 and extending into the inner tubular portion 50.
  • the hole 56 is of frustoconical shape, flared toward the part 40, while the axis 48 is lined at its base with a cylindrical part 49 with a smaller diameter than the smaller one of the frustoconical hole 56 so as to allow , according to the insertion depth of the piece 49 in this frustoconical hole 56, to modulate the width of the passage 41 and even close it.
  • the space 54 is open on the outside, while the inner tubular portion 50 is connected to the gas injector 3 G.
  • the fan 1 creates a vacuum at the wall 44, and sucks the moving part or piston 40.
  • This movement opens the passages 41 and 42, and the air A and the gas G through the wall 44 through the openings O to mix.
  • the mobile part 40 When the flow rate of the fan 1 increases, the mobile part 40 is sucked by the depression created by the fan 1, and moves towards it, which makes it possible to enlarge the sections of the passages 41 of the gas G and the air AT.
  • the moving part 40 When the flow rate decreases, the moving part 40 is biased by a spring 43 mounted on the axis 48, which reduces the passages 41 and 42.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Jet Pumps And Other Pumps (AREA)

Abstract

Dispositif de bruleur à pré mélange gaz, comportant un ventilateur (1) d'aspiration du mélange air/gaz, une vanne d'alimentation en gaz (2), un injecteur de gaz (3), et un de venturi (4) intercalé entre le injecteur (3) et le ventilateur (1) en sorte de créer une dépression sur la vanne de gaz (2). Le venturi (4) comporte une pièce mobile (40), apte à se déplacer sous l'action du ventilateur (1) et d'un ressort de rappel (43), le déplacement de la pièce mobile étant apte à modifier les sections des passages (41, 42) de gaz (G) et d'air (A).

Description

  • La présente invention a pour objet un dispositif de bruleur à pré-mélange gaz.
  • Un dispositif de bruleur à pré mélange gaz fonctionne avec ratio air/gaz constant, il comporte un venturi qui crée une dépression sur la vanne gaz. Cette dépression est plus ou moins grande en fonction de la puissance demandée.
  • Un tel dispositif présente toutefois un inconvénient, sachant que la dépression évolue au carré du débit, il est difficile d'obtenir un signal de dépression suffisant lorsque l'on réduit le débit au-delà de 5. En effet, lorsque le débit est divisé par 5, la dépression est divisée par 25.
  • Pour pallier cet inconvénient, et permettre de forts taux de modulation, il a été proposé de faire varier la section de l'aspiration de l'air de combustion et du gaz dans des proportions équivalentes. Ceci est obtenu au travers de systèmes mécaniques généralement pilotés par des servomoteurs ou solénoïdes. Grace à la variation des sections, la dépression reste importante malgré une diminution du débit.
  • La présente invention a pour but de résoudre l'inconvénient précité sans faire appel à un pilotage ou toutes sources d'énergie extérieure.
  • Le dispositif de bruleur à pré mélange gaz selon l'invention comporte un ventilateur d'aspiration du mélange air/gaz, une vanne d'alimentation en gaz, un injecteur de gaz, et un Venturi intercalé entre ledit injecteur et ledit ventilateur en sorte de créer une dépression sur ladite vanne de gaz, et il se caractérise en ce que ledit comporte une pièce mobile, apte à se déplacer sous l'action dudit ventilateur et d'un ressort de rappel, le déplacement de ladite pièce mobile étant apte à modifier les sections des passages de gaz et d'air.
  • Selon une caractéristique additionnelle du dispositif selon l'invention, la pièce mobile comporte une paroi plane apte à être soumise à la dépression exercée par le ventilateur, et comprenant, sur sa face opposée à celle soumise à ladite dépression, des éléments saillants, aptes à s'insérer dans des ouvertures que comporte un corps dans lequel est guidée en déplacement ladite pièce mobile et qui sont en liaison avec des moyens d'alimentation en gaz ou en air, la coopération desdits éléments saillants avec lesdites ouvertures étant réalisée au travers de surfaces coniques, en sorte que la profondeur d'insertion desdits éléments saillants dans lesdites ouvertures permette de modifier les dimensions des passages, et donc de moduler les débits.
  • Les avantages et les caractéristiques du dispositif selon l'invention, ressortiront plus clairement de la description qui suit et qui se rapporte au dessin annexé, lequel en représente un mode de réalisation non limitatif.
  • Dans le dessin annexé :
    • la figure 1 représente une vue schématique du dispositif bruleur pré-mélange gaz selon l'invention.
    • la figure 2 représente une vue schématique en coupe médiane d'une partie du même dispositif.
  • En référence à la figure 1, on peut voir que le dispositif de bruleur pré-mélange gaz comporte un ventilateur centrifuge 1 d'aspiration du mélange air/gaz AG, une électrovanne 2 de commande de gaz commandée par un moteur M, un injecteur 3 de gaz G et un venturi 4.
  • Selon l'invention, le venturi 4, qui est également représenté sur la figure 2, comporte, en regard du ventilateur 1, une pièce 40, ou piston, mobile sous l'effet de dépression générée par le ventilateur 1, qui est apte, en fonction de sa position dans le venturi 4, à modifier la section des passages 41 du gaz G et 42 de l'air A.
  • A cet effet, le venturi 4 comprend deux pièces, outre la pièce mobile ou piston 40, un corps 5 comprenant trois parties tubulaires concentriques, interne 50, externe 51, et intermédiaire 52.
  • Les parties tubulaires concentriques intermédiaire 52 et externe 51 sont liées entre elles par des ponts de matière 53, en sorte de ménager un espace tubulaire 54. Les parties tubulaires concentriques intermédiaire 52 et interne 50, sont quant à elles réunies par une paroi d'extrémité 55 uniquement percée centralement d'un trou 56 débouchant dans la partie tubulaire interne 50.
  • La pièce 40 comprend une paroi plane 44 bordée périphériquement et d'un côté, d'une paroi 45 destinée à s'insérer dans l'espace 54, et qui présente extérieurement une face tubulaire 46 d'un diamètre lui permettant une insertion étroite sans coincement dans la partie tubulaire externe 5, et du côté interne une face 47 de forme générale tronconique, dont l'épaisseur à la base, du côté de la paroi plane 44, est supérieure à la largeur de l'espace 54.
  • La pièce 40 est ainsi mobile axialement dans la partie tubulaire externe 51, guidée par la face interne de cette dernière, tandis que la profondeur d'insertion de la paroi 45 dans l'espace 54, du fait de l'oblicité de la face 47, module la taille du passage 42 entre l'espace 54 et l'espace délimité par les paroi 44 et 55, jusqu'à éventuellement fermer ce passage. On notera que des butées 57 sont intercalées entre les parois 44 et 55.
  • Par ailleurs, la pièce 40 comporte centralement un axe 48 introduit dans le trou 56 et s'étendant dans la partie tubulaire interne 50.
  • Le trou 56 est de forme tronconique, évasé vers la pièce 40, tandis que l'axe 48 est garni à sa base d'une pièce cylindrique 49 d'un diamètre légère supérieur à celui le plus petit du trou tronconique 56 de manière à permettre, selon la profondeur d'insertion de la pièce 49 dans ce trou tronconique 56, de moduler la largeur du passage 41 et même fermer celui-ci.
  • On comprendra que selon la position de la pièce 40 par rapport à la paroi d'extrémité 55, permet de moduler les débits au niveau des passages 41 et 42.
  • L'espace 54 est ouvert sur l'extérieur, tandis que la partie tubulaire interne 50 est connectée à l'injecteur 3 de gaz G.
  • Enfin, la paroi plane 44 est percée périphériquement, intérieurement à la paroi 45, d'ouvertures O.
  • En fonctionnement, le ventilateur 1 crée une dépression au niveau de la paroi 44, et aspire la pièce mobile ou piston 40.
  • Ce déplacement ouvre les passages 41 et 42, et l'air A et le gaz G traversent la paroi 44 par les ouvertures O pour se mélanger.
  • Lorsque le débit du ventilateur 1 augmente, la pièce mobile 40 est aspirée par la dépression créée par le ventilateur 1, et se déplace vers celui-ci, ce qui permet d'agrandir les sections des passages 41 du gaz G et de l'air A.
  • Lorsque le débit diminue, la pièce mobile 40 est rappelée par un ressort 43 monté sur l'axe 48, ce qui réduit les passages 41 et 42.
  • On obtient donc un système venturi 4 qui s'adapte automatiquement en fonction du fonctionnement du ventilateur 1.

Claims (2)

  1. Dispositif de bruleur à pré mélange gaz, comportant un ventilateur (1) d'aspiration du mélange air/gaz, une vanne d'alimentation en gaz (2), un injecteur de gaz (3), et un de venturi (4) intercalé entre ledit injecteur (3) et ledit ventilateur (1) en sorte de créer une dépression sur ladite vanne de gaz (2), caractérisé en ce que ledit venturi (4) comporte une pièce mobile (40), apte à se déplacer sous l'action dudit ventilateur (1) et d'un ressort de rappel (43), le déplacement de ladite pièce mobile étant apte à modifier les sections des passages (41, 42) de gaz (G) et d'air (A).
  2. Dispositif selon la revendication 1, caractérisé en ce que la pièce mobile (40) comporte une paroi plane (44) apte à être soumise à la dépression exercée par le ventilateur (1), et comprenant, sur sa face opposée à celle soumise à ladite dépression, des éléments saillants (45, 49), aptes à s'insérer dans des ouvertures (54, 56) que comporte un corps (5) dans lequel est guidée en déplacement ladite pièce mobile (40) et qui sont en liaison avec des moyens d'alimentation en gaz (G) ou en air (A), la coopération desdits éléments saillants (45, 49) avec lesdites ouvertures (54, 56) étant réalisée au travers de surfaces coniques (47), en sorte que la profondeur d'insertion desdits éléments saillants (45, 49) dans lesdites ouvertures (54, 56) permette de modifier les dimensions des passages (41, 42), et donc de moduler les débits.
EP15159682.2A 2014-03-19 2015-03-18 Dispositif de bruleur a pre melange gaz Active EP2921777B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1452252A FR3018899A1 (fr) 2014-03-19 2014-03-19 Dispositif de bruleur a pre melange gaz
FR1456766A FR3018900B1 (fr) 2014-03-19 2014-07-15 Dispositif de bruleur a pre melange gaz

Publications (2)

Publication Number Publication Date
EP2921777A1 true EP2921777A1 (fr) 2015-09-23
EP2921777B1 EP2921777B1 (fr) 2016-10-12

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EP15159682.2A Active EP2921777B1 (fr) 2014-03-19 2015-03-18 Dispositif de bruleur a pre melange gaz

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US (1) US20160069563A1 (fr)
EP (1) EP2921777B1 (fr)
FR (1) FR3018900B1 (fr)

Families Citing this family (4)

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DE102017102085A1 (de) * 2017-02-02 2018-08-02 Max Weishaupt Gmbh Vormischverfahren, dieses verwendendes Verbrennungsverfahren sowie Vormischvorrichtung und damit versehener Brenner
DE102017216961A1 (de) * 2017-09-25 2019-03-28 Robert Bosch Gmbh Mischeinrichtung für Heizgeräte sowie Heizgeräte mit einer solchen Mischeinrichtung
CN212537829U (zh) * 2020-06-24 2021-02-12 艾欧史密斯(中国)热水器有限公司 气体混合装置以及燃气热水装置
US11808453B2 (en) 2020-06-24 2023-11-07 A.O. Smith Corporation Gas mixing device and gas water heating device

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Also Published As

Publication number Publication date
FR3018900A1 (fr) 2015-09-25
EP2921777B1 (fr) 2016-10-12
US20160069563A1 (en) 2016-03-10
FR3018900B1 (fr) 2016-04-15

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