EP3126738B1 - Brûleur à gaz pour plaque de cuisson et plaque de cuisson comprenant un tel brûleur à gaz - Google Patents

Brûleur à gaz pour plaque de cuisson et plaque de cuisson comprenant un tel brûleur à gaz Download PDF

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Publication number
EP3126738B1
EP3126738B1 EP15718096.9A EP15718096A EP3126738B1 EP 3126738 B1 EP3126738 B1 EP 3126738B1 EP 15718096 A EP15718096 A EP 15718096A EP 3126738 B1 EP3126738 B1 EP 3126738B1
Authority
EP
European Patent Office
Prior art keywords
gas burner
air
inlet
ring nut
gas mixture
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.)
Active
Application number
EP15718096.9A
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German (de)
English (en)
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EP3126738A1 (fr
Inventor
Carlo Zambruni
Bujar Taga
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.)
Smeg SpA
Original Assignee
Smeg SpA
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
Publication date
Application filed by Smeg SpA filed Critical Smeg SpA
Priority to SI201530384T priority Critical patent/SI3126738T1/sl
Priority to PL15718096T priority patent/PL3126738T3/pl
Publication of EP3126738A1 publication Critical patent/EP3126738A1/fr
Application granted granted Critical
Publication of EP3126738B1 publication Critical patent/EP3126738B1/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
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • F23D14/583—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration of elongated shape, e.g. slits
    • 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
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/08—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with axial outlets at the burner head
    • F23D14/085—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with axial outlets at the burner head with injector axis inclined to the burner head axis

Definitions

  • the present invention relates to a gas burner for a cooking hob.
  • the gas burner of the invention is of the depressed type, i.e., it is configured to be associated with the cooking hob so that the upper surface thereof is positioned substantially at the same level as the cooking hob or projects in an absolutely insignificant manner with respect to the cooking hob taking as a reference the overall height of the gas burner.
  • the gas burner of the invention is of the laminar type.
  • a gas burner of the laminar flame type is known by the Italian patent application n° MI2011A001471 to the same Applicant.
  • Such a burner comprises, in the essential elements thereof, a hollow structure in which an annular expansion chamber for the expansion of the air/gas mixture (such a mixture comprising primary air) and, at the top of said annular expansion chamber, an elongated annular slot for the outlet of the air/gas mixture are defined.
  • the gas burner with a laminar flame described above is capable of increasing the yield with respect to conventional gas burners of the type described for example in EP 1 469 256 .
  • Such gas burners comprise a plurality of openings for the outlet of the air/gas mixture from the expansion chamber, wherein such outlet openings are closer together and have a different diameter from one another so as to supply air/gas mixture to pilot flames that are alternated with heating flames.
  • the alternation of pilot flames with heating flames is a configuration that has limitations also as far as the modulation capability of the gas burner is concerned, and moreover it does not make it possible to drop below set power values.
  • the outlet openings have small dimensions and therefore they can easily become obstructed and can make it difficult for the flame to propagate to the adjacent outlet openings during ignition of the gas burner.
  • the gas burner with a laminar flame is capable of reaching very low minimum values.
  • the elongated annular slot ensures that the flame propagates well along the entire length of the slot during ignition, avoiding the drawbacks of conventional gas burners.
  • the gas burner with laminar flame has a good aesthetic appearance, essentially due to the absence of a plurality of outlet openings and, when turned on, to the provision of a vertical flame having the shape of a continuous ring.
  • a gas burner with a laminar flame is also known from GB 1 544 624 A .
  • the gas burner with a laminar flame of the type known in Italian patent application n° MI2011A001471 is configured so that, when it is mounted on a cooking hob, the annular expansion chamber projects in a considerable manner above the cooking hob.
  • the Applicant has felt the need to improve the aesthetic appearance of the gas burner with laminar flame described above.
  • the Applicant has thought of making a gas burner with depressed laminar flame, i.e. configured so as to project above the cooking hob in an absolutely insignificant manner.
  • the present invention thus relates, in a first aspect thereof, to a gas burner for a cooking hob, comprising at least one hollow structure in which an inlet chamber for the inlet of an air/gas mixture, an expansion chamber for the expansion of the air/gas mixture arranged above said inlet chamber and an annular slot for the outlet of the air/gas mixture arranged above said expansion chamber and configured for supplying the air/gas mixture to a laminar flame exiting from the gas burner are defined, characterised in that said at least one hollow structure comprises at least one inlet opening for the inlet of secondary air that is arranged beneath said inlet chamber.
  • the gas burner of the present invention is configured so as to allow the secondary air, which is necessary to lick the flame on both sides for making a flame that is substantially vertical, to enter the cavity of the hollow structure from a portion of the hollow structure intended to be arranged below the cooking hob, thus making it possible to house the burner as much as possible inside the cooking hob itself.
  • a second aspect of the invention relates to a cooking hob which comprises at least one gas burner of the type described above.
  • the cooking hob of the invention achieves the technical and aesthetic effects described above with respect to the gas burner.
  • the present invention can have at least one of the following preferred characteristics; the latter, in particular, can be combined with one another as desired with the purpose of satisfying specific application requirements.
  • the inlet opening for the inlet of secondary air is defined on a lower face of said at least one hollow structure.
  • the gas burner further comprises a collector for the supply of the air/gas mixture that is associated with said inlet chamber.
  • such a collector is arranged at a height not lower than that of said inlet chamber.
  • said at least hollow structure comprises a diaphragm interposed between said expansion chamber and said inlet chamber.
  • said diaphragm comprises a plurality of angularly adjacent slots for the passage of the air/gas mixture from the inlet chamber to the expansion chamber.
  • Such slots make it possible to both slow down the flow of air/gas mixture from the inlet chamber to the expansion chamber and to homogenously distribute the air/gas mixture inside the expansion chamber.
  • Said expansion chamber is delimited at the bottom part thereof by said diaphragm and said expansion chamber is delimited at a side part thereof by a first ring nut that is configured to be associated with said cooking hob and by a second ring nut arranged at a radially inner position with respect to said first ring nut.
  • the first ring nut and the second ring nut also delimit the annular slot for the outlet of the air/gas mixture.
  • both the first ring nut and the second ring nut are in abutment against said diaphragm.
  • said second ring nut comprises a radially outer wall which delimits said expansion chamber and a radially inner wall which delimits an inner annular portion of said at least one hollow structure.
  • said radially inner wall comprises a plurality of angularly adjacent partition baffles that are separated by respective openings for the passage of said secondary air towards said radially outer wall.
  • Such openings make it possible to distribute the secondary air evenly inside the hollow structure close to the annular slot for the outlet of the air/gas mixture.
  • the gas burner of the invention further comprises an upper circular closing element for closing the hollow structure.
  • said circular closing element rests on the upper part of said baffles.
  • the gas burner of the invention further comprises an annular slot for the outlet of the secondary air, the annular slot being arranged at a radially inner position with respect to the annular slot for the outlet of the air/gas mixture and in fluid communication with the inlet opening for the inlet of the secondary air.
  • the annular slot for the outlet of the secondary air is delimited at a side part thereof by the circular closing element and by the radially outer wall of the second ring nut.
  • the gas burner of the invention further comprises an ignition device and a flame sensor both associated with the second ring nut and having respective upper ends arranged at an upper portion of the second ring nut and not projecting upwardly with respect to said second ring nut.
  • reference numeral 5 indicates a gas burner in accordance with the present invention, mounted on a cooking hob 1.
  • the cooking hob 1 shown in figure 2 comprises a support plate 2 and five burners 5 that are arranged on the support plate 2, as well as five handles 6 for modulating the air/gas mixture.
  • the cooking hob 1 is intended to be mounted on a horizontal plane or kitchen top 100.
  • the cooking hob 1 comprises respective grids 8 for saucepans (which are not illustrated). Each grid 8 is associated with a respective burner 5. In an alternative embodiment that is not illustrated, a single grid for all the burners 5 of the cooking hob 1 can be provided.
  • a casing 30 is associated with the cooking hob at the seat in which the burner 5 is to be mounted.
  • the burner 5 comprises a hollow structure 7 that can have different shapes and sizes.
  • the hollow structure 7 has a closed loop annular shape.
  • At least one of the burners illustrated in figure 2 can comprise two hollow structures 7 arranged concentrically. Such a burner is called ultra-fast gas burner.
  • an inlet chamber 7a for the inlet of the air/gas mixture and an expansion chamber 7b for the expansion of air/gas mixture are defined, the expansion chamber 7b being arranged above the inlet chamber 7a.
  • annular slot 17 for the outlet of the air/gas mixture is defined above the expansion chamber 7b.
  • Such a slot 17 is configured for supplying the air/gas mixture to a laminar flame exiting from the gas burner 5.
  • the slot 17 is elongated along a direction that is substantially vertical, so that the flow of air/gas mixture flows in the slot 17 in a direction that is substantially vertical from the expansion chamber 7b towards an outlet mouth 19 of the slot 17.
  • the slot 17 is continuous and it extends for the entire circumferential extension of the hollow structure 7.
  • the slot 17 has a width and a depth that are constant.
  • the depth of the slot 17 has the function of homogenizing the laminar flow of the air/gas mixture, more precisely of primary air and gas, so as to form a stable flame.
  • the burner 5 moreover comprises an ignition device 9 and a flame sensor 10, which are both associated with the hollow structure 7.
  • the burner 5 further comprises a collector 11 for the supply of the air/gas mixture.
  • the collector 11 is associated with, and in fluid communication with, the inlet chamber 7a.
  • the collector 11 is arranged at a height that is not lower than that of the inlet chamber 7a. More in particular, the collector 11 is arranged at the side of the inlet chamber 7a; its opening mouth in the inlet structure 7a is thus laterally displaced with respect to an axis of symmetry of the hollow structure 7.
  • the collector 11 has a Venturi tube 12 configured to receive gas from a nozzle 13 that is arranged at one end of a gas feeding tube 14.
  • the gas injected inside the Venturi tube 12 becomes enriched with air, called primary air, and mixes with it.
  • the hollow structure 7 comprises an opening 7c for the inlet of secondary air arranged below the inlet chamber 7a.
  • the secondary air which is necessary to lick the flame on both sides so as to make a substantially vertical flame, thus enters inside the cavity of the hollow structure 7 from a lower portion of the hollow structure 7 intended to be arranged below the cooking hob 1.
  • the opening 7c for the inlet of secondary air is defined on a lower face 7d of the hollow structure 7.
  • the secondary air passes between said lower face 7d and the casing 30 (arrows F' in figure 4 ) and enters centrally inside the hollow structure 7 moving towards the top thereof (arrows F" in figure 4 ).
  • the expansion chamber 7b, as well as the inlet chamber 7a, are also intended to be arranged below the support plate 2, as clearly shown in figures 3 and 4 , so as to house the burner 5 as much as possible inside the cooking hob 1.
  • the hollow structure 7 comprises a diaphragm 7e interposed between the expansion chamber 7b and the inlet chamber 7a.
  • the diaphragm 7e comprises a plurality of slots 7f that are arranged circumferentially and angularly adjacent for the passage of the air/gas mixture from the inlet chamber 7a to the expansion chamber 7b.
  • the expansion chamber 7b is thus delimited at the bottom part thereof by the diaphragm 7e.
  • the expansion chamber 7b is delimited at a side part thereof by a first ring nut 7g, which is associated with the support plate 2 of the cooking hob 1, and by a second ring nut 7h which is arranged at a radially inner position with respect to the first ring nut 7g.
  • the first ring nut 7g and the second ring nut 7h also delimit the annular slot 17 for the outlet of the air/gas mixture.
  • a radially outer wall 7g' of the first ring nut 7g converges towards the outlet mouth 19 of the slot 17.
  • both the first ring nut 7g and the second ring nut 7h are in abutment against the diaphragm 7e.
  • the second ring nut 7h comprises a radially outer wall 7h' which delimits the expansion chamber 7b ( figure 4 ) and a radially inner wall 7h" which delimits an inner annular portion 7i of the hollow structure 7 ( figure 5 ).
  • the radially inner wall 7h" comprises a plurality of angularly adjacent partition baffles 7h"', separated by respective openings 7h"", for the passage of the secondary air towards the radially outer wall 7h'.
  • the burner 5 further comprises an upper circular closing element 15 for closing the hollow structure 7.
  • the circular closing element 15 rests on the upper part of the baffles 7h"'.
  • the burner 5 further comprises an annular slot 16 for the outlet of the secondary air, which is arranged at a radially inner position with respect to the slot 17 for the outlet of the air/gas mixture and in fluid communication with the inlet opening of the secondary air ( figures 3 and 4 ).
  • the annular slot 16 for the outlet of the secondary air is delimited at a side part thereof by the circular closing element 15 and by the radially outer wall 7h' of the second ring nut 7h.
  • the ignition device 9 and the flame sensor 10 are both associated with the second ring nut 7h.
  • the respective upper ends 9a and 10a thereof are arranged at an upper portion of the second ring nut 7h so as to not project above with respect to the second ring nut 7h.
  • the ignition device 9 is of the piezoelectric type. The ignition spark is made at the upper end 9a.
  • the ignition of the air/gas mixture preferably occurs exclusively when a saucepan is positioned above the gas burner 5.
  • the bottom of the saucepan constitutes a stop barrier for the air/gas mixture, which is forced to propagate downwards and reaches, in such a way, the end 9a of the ignition device 9.
  • a diaphragm 20 is provided between the annular slot 17 and the expansion chamber 7b.
  • the diaphragm 20 is substantially defined by a wall of the first ring nut 7g which radially projects inwards and defines, together with a radially outer surface of the radially outer wall 7h' of the second ring nut 7h, a passage for the air/gas mixture from the expansion chamber 7b to the annular slot 17.
  • the diaphragm 20 forces the air/gas mixture which is in the expansion chamber 7b to follow a tortuous path before entering in the annular slot 17.
  • the tortuous path makes it possible to homogenise the distribution of air/gas mixture inside the annular slot 17 and to form an even flame.
  • the air/gas mixture coming from the collector 11 firstly passes through the inlet chamber 7a and subsequently evenly distributes inside the expansion chamber 7b passing through the slots 7f of the diaphragm 7e. From the expansion chamber 7b the air/gas mixture passes through the diaphragm 20, in the annular slot 17 and supplies the laminar flame exiting from the outlet mouth 19 of the annular slot 17.
  • the secondary air enters the cavity of the hollow structure 7 from the opening 7c, evenly distributes in the annular slot 16 passing through the openings 7h'" of the second ring nut 7h and exits from such an annular slot 16 so as to lick the inside of the aforementioned laminar flame.
  • the path of the secondary air from the inlet opening 7a to the second ring nut 7h is indicated in figure 4 with the arrows F.

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

Claims (9)

  1. Brûleur à gaz (5) pour une table de cuisson (1), comprenant au moins une structure creuse (7) dans laquelle sont définies une chambre d'admission (7a) pour l'admission d'un mélange air/gaz, une chambre de détente (7b) pour la détente du mélange air/gaz agencée au-dessus de ladite chambre d'admission (7a), et une fente annulaire (17) pour la sortie du mélange air/gaz agencée au-dessus de ladite chambre de détente (7b) et configurée pour délivrer le mélange air/gaz à une flamme laminaire annulaire sortant du brûleur à gaz (5), ladite au moins une structure creuse (7) comprenant au moins une ouverture d'entrée (7c) pour l'entrée d'air secondaire, dans lequel ladite ouverture d'entrée (7c) est agencée sous ladite chambre d'admission (7a), dans lequel ladite au moins une structure creuse (7) comprend une membrane (7e) interposée entre ladite chambre de détente (7b) et ladite chambre d'admission (7a), caractérisé en ce que ladite chambre de détente (7b) est délimitée au niveau d'une partie inférieure de celle-ci par ladite membrane (7e) et au niveau d'une partie latérale de celle-ci par un premier écrou annulaire (7g) configuré pour être associé à ladite table de cuisson (1) et en butée sur ladite membrane (7e) et par un deuxième écrou annulaire (7h) agencé au niveau d'une position radialement intérieure par rapport audit premier écrou annulaire (7g) et en butée sur ladite membrane (7e).
  2. Brûleur à gaz (5) selon la revendication 1, dans lequel ladite ouverture d'entrée (7c) pour l'entrée d'air secondaire est définie sur une face inférieure (7d) de ladite au moins une structure creuse (7).
  3. Brûleur à gaz (5) selon la revendication 1 ou 2, comprenant un collecteur (11) pour l'alimentation du mélange air/gaz, ledit collecteur (11) étant associé à ladite chambre d'admission (7a) et agencé à une hauteur non inférieure à celle de ladite chambre d'admission (7a) et/ou sur un côté de ladite chambre d'admission (7a).
  4. Brûleur à gaz (5) selon l'une quelconque des revendications précédentes, dans lequel ladite membrane (7e) comprend une pluralité de fentes angulairement adjacentes (7f) pour le passage du mélange air/gaz de la chambre d'admission (7a) à la chambre de détente (7b).
  5. Brûleur à gaz (5) selon l'une quelconque des revendications précédentes, dans lequel ledit deuxième écrou annulaire (7h) comprend une paroi radialement extérieure (7h') qui délimite ladite chambre de détente (7b) et une paroi radialement intérieure (7h") qui délimite une portion annulaire intérieure (7i) de ladite au moins une structure creuse (7), dans lequel ladite paroi radialement intérieure (7h") comprend une pluralité de chicanes de cloisonnement angulairement adjacentes (7h"') séparées par des ouvertures respectives (7h"") pour le passage dudit air secondaire vers ladite paroi radialement extérieure (7h').
  6. Brûleur à gaz (5) selon la revendication 5, comprenant un élément de fermeture circulaire (15) reposant sur la partie supérieure desdits chicanes de cloisonnement (7h"').
  7. Brûleur à gaz (5) selon l'une quelconque des revendications précédentes, comprenant un dispositif d'allumage (9) et un capteur de flamme (10) tous deux associés audit deuxième écrou annulaire (7h) et ayant des extrémités supérieures respectives (9a, 10a) agencées au niveau d'une portion supérieure dudit deuxième écrou annulaire (7h) et ne faisant pas saillie vers le haut par rapport audit deuxième écrou annulaire (7h).
  8. Brûleur à gaz (5) selon l'une quelconque des revendications précédentes, comprenant une fente annulaire (16) pour la sortie de l'air secondaire agencée au niveau d'une position radialement intérieure par rapport à la fente annulaire (17) pour la sortie du mélange air/gaz et en communication de fluide avec ladite ouverture d'entrée (7c) pour l'entrée de l'air secondaire, dans lequel, de préférence, ladite fente annulaire (16) pour la sortie d'air secondaire est délimitée au niveau d'une partie latérale de celle-ci par ledit élément de fermeture circulaire (15) et par ladite paroi radialement extérieure (7h') dudit deuxième écrou annulaire (7h).
  9. Table de cuisson (1) comprenant au moins un brûleur à gaz (5) selon l'une quelconque des revendications précédentes.
EP15718096.9A 2014-04-04 2015-03-25 Brûleur à gaz pour plaque de cuisson et plaque de cuisson comprenant un tel brûleur à gaz Active EP3126738B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI201530384T SI3126738T1 (sl) 2014-04-04 2015-03-25 Plinski gorilnik za kuhalno ploščo in kuhalna plošča, ki vsebuje tako plinski gorilnik
PL15718096T PL3126738T3 (pl) 2014-04-04 2015-03-25 Palnik gazowy do płyty kuchennej i płyta kuchenna zawierająca taki palnik gazowy

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20140616 2014-04-04
PCT/IB2015/052201 WO2015150984A1 (fr) 2014-04-04 2015-03-25 Brûleur à gaz pour plaque de cuisson et plaque de cuisson comprenant un tel brûleur à gaz

Publications (2)

Publication Number Publication Date
EP3126738A1 EP3126738A1 (fr) 2017-02-08
EP3126738B1 true EP3126738B1 (fr) 2018-06-06

Family

ID=50897753

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15718096.9A Active EP3126738B1 (fr) 2014-04-04 2015-03-25 Brûleur à gaz pour plaque de cuisson et plaque de cuisson comprenant un tel brûleur à gaz

Country Status (5)

Country Link
EP (1) EP3126738B1 (fr)
ES (1) ES2685870T3 (fr)
PL (1) PL3126738T3 (fr)
SI (1) SI3126738T1 (fr)
WO (1) WO2015150984A1 (fr)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1844151A (en) * 1928-03-03 1932-02-09 Cleveland Heater Co Gas burner
US1956857A (en) * 1931-02-05 1934-05-01 Autogas Corp Gas burner
US2526748A (en) * 1946-02-09 1950-10-24 L J Mueller Furnace Company Gas burner with adjustable flame slot and central secondary air supply
FR1077026A (fr) * 1953-03-17 1954-11-03 Fr D Incandescence Par Le Gaz Brûleur à combustible gazeux
GB1544624A (en) * 1976-05-21 1979-04-25 Ti Domestic Appliances Ltd Gaseous fuel burners
GB2348696A (en) * 1999-04-07 2000-10-11 Winpo Enterprises Sdn Bhd Burner with burner plate
ITMI20030829A1 (it) 2003-04-18 2004-10-19 Smeg Spa Fornello a gas e piano di cottura.
EP2072901B1 (fr) * 2007-12-17 2019-06-05 Candy S.p.A. Table de cuisson domestique à gaz
ES2694766T3 (es) * 2011-03-31 2018-12-27 Candy S.P.A. Unidad de quemador y placa de cocción de gas
ITMI20111471A1 (it) 2011-08-01 2013-02-02 Smeg Spa Bruciatore a gas per un piano di cottura e piano di cottura comprendente tale bruciatore a gas

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
SI3126738T1 (sl) 2018-10-30
WO2015150984A1 (fr) 2015-10-08
EP3126738A1 (fr) 2017-02-08
ES2685870T3 (es) 2018-10-11
PL3126738T3 (pl) 2018-09-28

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