EP2235442B1 - Unité de ventilateur pour brûleurs à gaz avec prémélange et appareil de brûleur comprenant ledit ventilateur - Google Patents

Unité de ventilateur pour brûleurs à gaz avec prémélange et appareil de brûleur comprenant ledit ventilateur Download PDF

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Publication number
EP2235442B1
EP2235442B1 EP08865124.5A EP08865124A EP2235442B1 EP 2235442 B1 EP2235442 B1 EP 2235442B1 EP 08865124 A EP08865124 A EP 08865124A EP 2235442 B1 EP2235442 B1 EP 2235442B1
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EP
European Patent Office
Prior art keywords
fan
impeller
arrangement according
ducts
flow
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Application number
EP08865124.5A
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German (de)
English (en)
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EP2235442A2 (fr
Inventor
Antonio Ranalli
Rosalino Usci
Michele Marcantoni
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Sit SpA
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Sit SpA
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Publication of EP2235442B1 publication Critical patent/EP2235442B1/fr
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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
    • F23D14/34—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

Definitions

  • the present invention concerns an arrangement comprising a fan unit and a gas burner with pre-mixing, having the characteristics mentioned in the preamble of claim 1.
  • a fan unit for gas burners having the features outlined above is known from EP 834695 A1 .
  • burners for gas of the premixed type in which the combustion head is intended to be housed in a combustion chamber into which the air/gas mixture is fed via the delivery side of a fan unit.
  • the burner is connected to a gate or another similar member for closing the combustion chamber, and the intake section of the fan is positioned on the axially opposed side of the head with respect to the fan. This results in relative bulkiness at the gate, externally of the combustion chamber, owing to the structure for conveying air and gas towards the intake section of the fan.
  • a principal aim of the invention is that of providing a fan unit structurally and functionally designed to obtain, compared with known solutions, positioning within the burner body which is less bulky, making better use of the space and with smaller overall dimensions, and at the same time achieving an improvement in the functionality of the fan, especially in terms of efficiency in the pre-mixing of the air-gas mixture directed to the combustion head.
  • the reference 1 indicates as a whole a fan unit arranged for feeding to its delivery side a combustible air/gas mixture intended to be conveyed to a combustion head 2 of a gas burner 3 in which the ignition and combustion of the mixture takes place.
  • the fan is of the centrifugal type and comprises a bladed impeller 4 with a manifold 5 for housing the impeller itself in which an intake section 6 and a delivery section 7 of the fan are provided.
  • the impeller 4 is capable of being rotated about an axis of rotation X, by means of a drive means 8, for example an electric motor onto the drive shaft of which the impeller is keyed.
  • the fan is further arranged to be secured to the structure of the burner 3, and in particular is mounted, in combination with the burner, above a gate 9, constituting the closure member of the combustion chamber associated with the burner.
  • the gate conveniently comprises a plate-like base 9a on which are fixed, by means of suitable flanges, the motor 8, the manifold 5 and the combustion head 2, coaxial with one another and axially disposed one after the other, as shown diagrammatically in Figure 3 .
  • the combustion head 2 preferably has a configuration which is like a cap or spherical segment, the base of which is suitably secured to a support flange 10. Behind the head 2, and within the latter, a distributor member, indicated by 11, is provided, also substantially shaped like a cap and arranged with through openings for distributing the mixture on the combustion head.
  • an internal space or volume is defined, indicated as a whole by 12, into which are conveyed, separately and distinctly, the mixture coming from the delivery side 7 of the fan and directed to the distributor 11, and also the flow of air and gas directed to the intake section 6 of the fan, as will become clear from the continuation of the description.
  • first conveying means are provided for conveying the combustible air/gas mixture onto the head 2 fed via the delivery side 7 of the fan
  • second, separate and distinct, conveying means are provided for conveying the flow of air, and optionally gas, drawn from outside the burner body 3, in the direction of the intake section 6.
  • the intake section 6 of the fan is arranged on the same side as the combustion head 2, being in communication with a first chamber 15 defined in the volume space 12, which is contained between the combustion head and the impeller.
  • the conveying means 13, 14 are selected to have a length and configuration such that the flow of the air/gas mixture to the delivery side of the fan crosses the flow of air and/or gas directed to the intake section 6, as shown diagrammatically in Figure 3 , in which the flows are conducted separately and distinctly from each other by the respective first and second conveying means.
  • arrows coloured white (intake flow) and black (flow to delivery side) respectively designate the directions of the aforesaid flows, which cross at a zone designated by M in the axial section of Figure 3 .
  • the first conveying means 13 comprise a first plurality of ducts, all indicated by 16, which extend at the delivery section 7 of the fan, beyond the outside diameter of the impeller 4, to connect the delivery section with a second chamber 17 for distributing the mixture, also defined in the space 12 contained between the distributor member 11 and the impeller, and also separated from the chamber 15 by means of a wall 18, as illustrated diagrammatically in Figure 3 .
  • the ducts 16 are distributed circumferentially, downstream of the delivery section 7, at a predetermined angular pitch, in particular at a regular angular pitch. Moreover, each duct 16 has, with respect to the flow direction, an intake opening 16a for the mixture (supplied by the delivery side of the fan) in which the flow has a predominant radial component, and an outlet opening 16b, at the opposite end, in which the flow has a predominant axial component.
  • the configuration of the chamber 17 is such as to further deflect the flow in order to convey it along the distributor 11, in order to impinge effectively on the combustion head 2.
  • the second conveying means 14 themselves comprise a respective plurality of ducts, all indicated by 19, which are disposed alternately with the ducts 16, such that in the zone M where the flows cross, a duct 19 is interposed between a pair of ducts 16 adjacent to each other.
  • Each duct 19 is further conveniently defined in the central cavity 20a passing through a respective straightener blade 20, which is part of a plurality of stator straightener blades. Between each pair of stator blades 20 is defined a corresponding duct 16 of the first plurality of ducts.
  • Each duct 19 also has, with respect to the flow direction, an inlet opening 19a, open to the outside of the burner body (for the admission of the air, and optionally gas, of the gas) and an opposed outlet opening 19b, communicating with the chamber 15 which is itself connected to the intake section 6 of the fan.
  • the reference 21 also indicates stator blades provided in the chamber 15 for suitably conveying the flow of air, and optionally gas, in the direction of the intake section 6, and capable of imparting to the flow an optional pre-rotational component, obtained by the curved profile of the stator blades.
  • the ducts 19 are also distributed along a circumferential profile concentric with the axis of the impeller and located downstream of the delivery section 7. Moreover, a distribution of ducts at a regular angular pitch is preferred.
  • the inlet opening 19a of each duct is such as to impart a predominant axial component to the flow, which is then deflected to reach the outlet opening 19b where it has a predominant radial component, at the entry into the chamber 15, through which it is conveyed to the intake section 6 of the fan.
  • the latter conveniently comprises an opening 6a coaxial with the axis X of the impeller.
  • Figure 1 illustrates a preferred configuration of ducts 19, the air entry openings 19a of which can be seen. Through one or more of the openings 19a, the entry of the gas to the inside of the fan unit may take place.
  • One of the principal advantages of the invention lies in the fact that by conveying the intake air/gas flow on the same side as the head, it is possible to take advantage of the space inside the head which is arranged between the head and the impeller, thus reducing as far as possible the overall dimensions required outside the impeller in the zone conventionally dedicated to the intake of the air or of the gas (located in proximity to the axis of the impeller, on the opposite side of the combustion head from the impeller itself).
  • the arrangement according to the invention is obtained by means of respective stator straightener devices located at the intake side and at the delivery side of the fan, and which in fact impart to the flows a relative intersection, as demonstrated above.
  • Another advantage lies in the fact that in the arrangement according to the invention it is possible to obtain the measurement of the flow rate by arranging a pressure sensor in the intake chamber.
  • Yet another advantage is that of being able to have in the fan unit according to the invention an air/gas mixing chamber incorporated in the fan itself.
  • Another advantage is linked to the fact of being able to ensure an improved degree of quietness for the arrangement produced according to the invention.
  • Another advantage is linked to the greater compactness obtainable in the arrangement according to the invention, compared with known machines having similar performance characteristics.
  • Yet another advantage lies in the lower cost at which the invention can be produced owing to the fact that the arrangement incorporates within it more functions for each component.
  • the invention thus achieves the aims proposed with respect to the known solutions, obtaining the advantages listed compared with the known solutions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Gas Burners (AREA)
  • Air Supply (AREA)

Claims (12)

  1. Agencement comprenant une unité de ventilateur et un brûleur de gaz (3) avec prémélange du type comprenant une tête de combustion (2) et des premiers moyens de transport (13) pour le transport d'un mélange air-gaz combustible alimenté au côté de fourniture du ventilateur dans la direction de la tête (2), ladite unité de ventilateur comprenant un rotor radial (4) et un collecteur (5) pour loger ledit rotor, le ventilateur étant doté d'au moins une section d'admission (6) et d'au moins une section de fourniture (7) pour le flux qui sont définies dans le collecteur (5), des moyens d'entraînement (8) étant prévus pour la rotation du rotor (4) autour d'un axe de rotation (X), la section d'admission (6) du ventilateur étant agencée du même côté que la tête de combustion (2), ledit agencement comprenant des seconds moyens de transport (14) pour le transport du flux d'air, et en option de gaz, entre la tête (2) et le rotor (4) dans la direction de ladite section d'admission (6), caractérisé en ce que lesdits premier et second moyens de transport (13, 14) présentent une longueur et une configuration telles que le flux du mélange air et gaz amené au côté de fourniture (7) du ventilateur croise le flux d'air, et en option de gaz, dirigé vers la section d'admission (6) du ventilateur, lesdits flux étant conduits séparément et distinctement par lesdits premier et second moyens de transport (13, 14) respectifs.
  2. Agencement selon la revendication 1, dans lequel ladite section d'admission (6) comprend une ouverture du collecteur (5) coaxiale à l'axe de rotation du rotor (4) et tournée axialement vers la tête de combustion (2).
  3. Agencement selon la revendication 1 ou 2, dans lequel lesdits premiers et seconds moyens de transport (13, 14) comprennent une première (16) et une seconde (19) pluralité respective de conduits disposés en alternance les uns par rapport aux autres, de sorte que dans la zone (M) avec lesdits flux se croisant, un conduit d'une de ladite pluralité soit interposé entre une paire de conduits de l'autre pluralité.
  4. Agencement selon la revendication 3, dans lequel les conduits (19) de ladite seconde pluralité sont au moins partiellement définis par des cavités respectives (20a) passant par des pales plus droites correspondantes (20) d'un premier dispositif de stator plus droit, chaque conduit (16) de ladite première pluralité étant au moins partiellement défini entre des paires de pales adjacentes (20).
  5. Agencement selon la revendication 4, dans lequel les conduits (19) de ladite seconde pluralité sont en communication fluidique au niveau d'une de leurs extrémités avec une première chambre (15) pour la connexion avec la section d'admission (6) du rotor (4), ladite chambre (15) s'étendant entre la tête (2) et le rotor (4).
  6. Agencement selon la revendication 5, dans lequel ladite chambre (15) est dotée de pales de stator.
  7. Agencement selon l'une quelconque des revendications 3 à 6, dans lequel les conduits (19) de ladite seconde pluralité sont distribués le long d'un profil circonférentiel concentrique avec l'axe (X) du rotor, situé en aval de la section de fourniture (7) par rapport à la direction de flux.
  8. Agencement selon la revendication 7, dans lequel les conduits (19) de ladite seconde pluralité sont disposés selon un pas angulaire régulier le long dudit profil circonférentiel.
  9. Agencement selon l'une quelconque des revendications 3 à 8, dans lequel les conduits (16) de ladite première pluralité s'étendent afin de relier la section de fourniture (7) du ventilateur à une seconde chambre (17) pour la distribution du mélange qui communique lui-même avec la tête de combustion (2).
  10. Agencement selon la revendication 9, dans lequel la première et la seconde chambre (15, 17) sont interposées axialement entre la tête (2) et le rotor (4) du ventilateur.
  11. Agencement selon l'une quelconque des revendications 3 à 10, dans lequel au niveau des conduits (16, 19) desdits premier et second moyens de transport avec des flux se croisant, la direction du flux d'admission présente une composante axiale dominante et la direction du flux de fourniture présente une composante radiale dominante.
  12. Agencement selon l'une quelconque des revendications 3 à 11, dans lequel l'injection du gaz dans ladite première chambre (15), en amont de la section d'admission (6) du rotor, a lieu à travers un ou plusieurs des conduits (19) de ladite seconde pluralité.
EP08865124.5A 2007-12-19 2008-12-10 Unité de ventilateur pour brûleurs à gaz avec prémélange et appareil de brûleur comprenant ledit ventilateur Active EP2235442B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD20070413 ITPD20070413A1 (it) 2007-12-19 2007-12-19 Gruppo ventilatore per bruciatori a gas con pre-miscelazione e apparecchio bruciatore includente detto ventilatore.
PCT/EP2008/067242 WO2009080527A2 (fr) 2007-12-19 2008-12-10 Unité de ventilateur pour brûleurs à gaz avec prémélange et appareil de brûleur comprenant ledit ventilateur

Publications (2)

Publication Number Publication Date
EP2235442A2 EP2235442A2 (fr) 2010-10-06
EP2235442B1 true EP2235442B1 (fr) 2017-04-12

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ID=40315747

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08865124.5A Active EP2235442B1 (fr) 2007-12-19 2008-12-10 Unité de ventilateur pour brûleurs à gaz avec prémélange et appareil de brûleur comprenant ledit ventilateur

Country Status (3)

Country Link
EP (1) EP2235442B1 (fr)
IT (1) ITPD20070413A1 (fr)
WO (1) WO2009080527A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1391676B1 (it) * 2008-11-07 2012-01-17 Sit La Precisa Spa Con Socio Unico Apparecchio bruciatore a gas con pre-miscelazione

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8801785D0 (en) * 1988-01-27 1988-02-24 Burco Dean Appliances Ltd Gas burner assemblies
DE59409120D1 (de) * 1993-12-06 2000-03-09 Papst Motoren Gmbh & Co Kg Brennergebläse für Gas-Vormischbrenner
AT404295B (de) * 1994-12-21 1998-10-27 Vaillant Gmbh Strahlungsbrenner
ES2141464T3 (es) 1996-10-03 2000-03-16 Siabs Industry S R L Dispositivo para suministrar una mezcla de gas-aire a quemadores, particularmente para aparatos de calefaccion.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
WO2009080527A2 (fr) 2009-07-02
ITPD20070413A1 (it) 2009-06-20
EP2235442A2 (fr) 2010-10-06
WO2009080527A3 (fr) 2009-08-20

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