EP3004737B1 - Verbesserter gasbrenner - Google Patents

Verbesserter gasbrenner Download PDF

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Publication number
EP3004737B1
EP3004737B1 EP14733301.7A EP14733301A EP3004737B1 EP 3004737 B1 EP3004737 B1 EP 3004737B1 EP 14733301 A EP14733301 A EP 14733301A EP 3004737 B1 EP3004737 B1 EP 3004737B1
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Prior art keywords
burner
annular
lateral
central
cup
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EP14733301.7A
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English (en)
French (fr)
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EP3004737A1 (de
Inventor
Carlo Paesani
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Defendi Italy SRL
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Defendi Italy SRL
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Priority to PL14733301T priority Critical patent/PL3004737T3/pl
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    • 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
    • F23D14/06—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 radial outlets at the burner head
    • 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
    • F23D2900/14—Special features of gas burners
    • F23D2900/14062—Special features of gas burners for cooking ranges having multiple flame rings

Definitions

  • the present invention relates to an improved gas burner.
  • Burners with several flame rings of the so-called multi-ring type are known, provided with a single gas inlet controlled by a standard single-exit valve.
  • the valve enables the gas to be fed to the burner inlet and from there simultaneously to all the flame rings, of both maximum and minimum capacity.
  • Burners with several flame rings of the so-called dual type are also known, which present two gas inlets, one associated with the burner outer portion, usually of annular shape, and the other associated with its central inner portion of circular shape.
  • this type of burner uses a special two-way valve, enabling two operative conditions: one of maximum power, in which both the burner portions are fed, and one in which the outer annular portion is not fed, so enabling more modular use and allowing a very low minimum power to be delivered.
  • a multi-ring burner which uses primary air and secondary air both originating from above the cooking hob.
  • it presents three cup-shaped closed chambers, each of which houses an injector; in greater detail, the injector positioned in the central cup feeds the circular central portion with gas, while the two lateral injectors each feed an outer portion of substantially half-moon shape.
  • mixing takes place by virtue of a venturi conduit of essentially radial type, i.e. with a gas and primary air feed conduit which open into a radially extending mixing chamber.
  • venturi conduits each of which is formed by a vertical conduit which widens from the bottom upwards and creates a venturi effect by interaction with a dome-shaped projection provided in the lower face of the flame divider.
  • this projection is inserted in the top of the vertical conduit such that the lower face of this projection and the upper terminal part of this conduit define a narrow passage causing the mixture to accelerate, giving rise to the venturi effect. Consequently, the two venturi conduits which feed the outer portions are also of substantially radial type, mixture acceleration taking place by virtue of the combination of a vertical conduit merging into a horizontal half-moon shaped chamber.
  • a first drawback of this solution is its particularly high production cost; in particular the dome projection provided in the lower face of the flame divider cannot be formed by the normal sheet metal cold-pressing process used for producing nearly all burners, but instead requires cast-iron casting or steel sintering processes, which are much more costly.
  • WO2004/044490 describes a multi-ring burner fed with primary air and secondary air both totally drawn from above the cooking hob.
  • the central injector feeds the central portion of the burner via a radial venturi
  • the other two lateral injectors feed the outer annular portion of the burner via two venturis of radial type such as those described in IT 1232887 .
  • this type of venturi requires its horizontal chamber to have rather large dimensions, and presents an internal diameter widening in that zone into which said radial venturis flow; in other words, the annular portion is of unusual and irregular shape.
  • the vertical conduits of this burner are cylindrical, do not present any converging and/or diverging portions and do not cause any vertical venturi effect.
  • the vertical lateral conduits present a constriction which then passes into a zone having a significant radial extension; the combination of these characteristics defines a venturi of radial effect.
  • This type of burner presents a third ring of flames which emerge from the annular portion and are directed inward; however said flames are distributed along an irregular annular profile. Because of this, traditional inexpensive closure covers of regular annular shape cannot be used to upperly close the chamber defined by the irregular annular portion.
  • WO2005/078342 describes a multi-ring burner also fed with primary and secondary air both drawn from above the cooking hob. It is composed of a single cup closed at its bottom and housing three injectors, in which the central injector is disposed vertically and feeds the central portion with gas, while the other two lateral injectors are inclined outward.
  • the flame divider body is formed in two parts which when connected together define two inclined conduits of venturi effect facing said lateral injectors.
  • US 2011/151385 describes a burner having the features specified in the preamble of claim 1.
  • This burner comprises a support body to be fixed to the lower surface of the cooking hob sheet metal; it is provided with three injectors facing three conduits defined in the flame divider. Inside the flame divider at the exit of the vertical venturi, barriers are provided to prevent flame separation phenomena. The outer edges of the flame divider body rest on the cooking hob sheet metal. In the light of all these characteristics, it is particularly complicated both to produce and to mount.
  • US 2010/279238 describes a burner comprising a support body provided with three injectors facing three vertical venturi conduits defined in the flame divider.
  • the lateral vertical venturi conduits are rather lengthy, hence the burner is particularly tall and bulky in height.
  • it is particularly complicated constructionally and hence costly.
  • An object of the invention is to eliminate the drawbacks of the known solutions by providing an improved three flame-ring gas burner which can operate both as a multi-ring and as a dual burner.
  • Another object of the invention is to provide an improved gas burner, the flames of which are not disturbed by sudden opening of an oven or unit door positioned below the cooking hob.
  • Another object of the invention is to provide an improved gas burner of reduced overall height.
  • Another object of the invention is to provide an improved gas burner of simple, rapid and low-cost construction.
  • the improved gas burner 2 comprises an injector holder 4 provided with a gas inlet 6 associated with a standard single-exit valve, not shown.
  • these figures show a burner according to the invention in the multi-ring version, i.e. in which all the flame rings are fed by a single gas source and are regulated altogether in the same manner.
  • a conduit 8 is provided which faces the gas inlet 6 and extends along the diameter of said injector holder 4.
  • cup-shaped depressed zones are also provided, i.e. closed both on their base and laterally, and open upwards; in particular, a central cup 10 and two lateral cups 12 and 12' are provided.
  • a first injector 14 is provided, which is disposed vertically and is in communication via the conduit 8 with the gas inlet 6.
  • a second injector 16 and a third injector 18 are provided respectively, which are also disposed vertically and are in communication via the conduit 8 with the gas inlet 6.
  • the injector holder 4 On its circumferential surface, the injector holder 4 presents a flange 20 provided with widened zones in which seats 22 are provided, required to fix the injector holder 4 by screws to the upper sheet metal of a cooking hob, not shown.
  • a flame divider 24 rests provided with appendices 26, which facilitate positioning and centring of this latter relative to the injector holder.
  • the flame divider 24 presents a central portion 28 surrounded by an outer annular portion 30; in particular, the bases of said portions are connected together by a flange 32 forming the bottom of an annular cavity 34.
  • the flame divider 24 is supported by raised portions 36 and 38 defined on the injector holder 4 and consisting of the upper prolongations of the lateral walls respectively of the two outer cups 12 and 12' and of the central cup 10. In this manner, between the flame divider 24 and the injector holder 4, passages are defined for the air drawn from above the cooking hob.
  • first slots 40 are provided for entry of primary air 41 into the two outer cups 12 and 12', and second slots 42 for entry of primary air 43 into the central cup 10; in addition, between the bottom of the flame divider 24 and the injector holder 4, openings 44 are provided for entry of secondary air 45 into the annular cavity 34 for the central flame ring 80 and for the inner annular flame ring 82.
  • the openings 44 define connection passages between the annular cavity 34 of the flame divider and the space surrounding the burner, above the cooking hob.
  • the central portion 28 of the flame divider 24 is provided centrally with a through vertical conduit 46 facing the injector 14 positioned in the central cup 10 and of upwardly converging frusto-conical shape. It opens into a cylindrical distribution chamber 48 of reduced height.
  • the outer annular portion 30 of the flame divider 24 is instead provided with two conduits 50 which face the injectors 16 and 18 and enter an annular distribution chamber 52 provided in the annular portion itself.
  • the central portion 28 of the flame divider 24 is provided on its upper edge with a plurality of first radial recesses 64, while the annular portion 30 is provided with a plurality of second radial recesses 66 and 68, defined respectively at the outer upper edge 70 and at the inner upper edge 72 of the annular distribution chamber 52.
  • a circular closure cover 74 is rested on the central portion 28 of the flame divider 24 and upperly defines the recesses 64, while an annular closure cover 76 is rested on the annular portion 30 and upperly defines the recesses 66 and 68.
  • the upper end of the venturi conduits 50 projects and emerges from the base 53 of the annular distribution chamber 52.
  • This is particularly advantageous in that it enables particularly lengthy vertical venturi conduits to be provided, in order to achieve optimal mixing of gas and primary air, while at the same time enabling a reduced overall height of the burner to be maintained.
  • it is also advantageous in that the fact that the upper end of the venturi conduits 50 is positioned at a level above the base 53 of the annular chamber 52 prevents any water which might spill over from a pan during cooking from entering the annular chamber 52 and from there arriving to obstruct the injector and/or enter the inner cavity of the cooking hob, where it could damage electrical circuits or other components.
  • each conduit 50 is at a slightly higher level than the upper edge 62 of the injector holder 4, this facilitating draw-in of primary air for mixing.
  • the two lateral conduits 50 are configured such that air and gas flow which leaves them and enters the annular distribution chamber 52 is substantially already completely mixed.
  • the height of the annular chamber 52 is greater than one half the radius of the lateral conduit 50 at its upper end.
  • each conduit 50 presents in sequence a convergent lower frusto-conical portion 54 of diameter at its lower end substantially between 11 and 12 mm and serves to convey the air and gas into a substantially cylindrical intermediate portion 56.
  • This has a diameter substantially between 8 and 9 mm and defines a constriction which serves to accelerate the air/gas mixture; this mixture then opens into the divergent upper frusto-conical portion 58, having an upper diameter substantially between 10 and 11 mm, which causes the mixture to expand.
  • the distance between the upper end of the venturi conduits 50 and the lower face of the annular cover 76 is substantially between 3 and 4 mm, preferably about 3.5 mm; essentially the passage between the outlet section of the venturi conduit 50 and the inlet section of the annular chamber 52 increases such that the mixture continues to expand, without hindrance, within the annular chamber itself.
  • the flame divider 24 is provided with centring fins 78 in order to enable unique positioning of the annular cover 76 relative to the annular portion 30 of the flame divider.
  • the burner single-exit control valve When in its operative state, the burner single-exit control valve, not shown, is open and consequently the gas reaches the three injectors 14, 16 and 18.
  • the gas leaving the injector 14 draws in, from the top of the cooking hob, a flow of primary air 43 which passes through the slots 42 to enter the central cup 10 and from there is drawn along the frusto-conical vertical conduit 46 causing the air and gas to mix.
  • the air and gas flow reaches the distribution chamber 48 their mixing is already complete; the mixture thus formed then leaves the central portion 28 through the radial recesses 64 to generate a central flame ring 80.
  • the gas that leaves the injectors 16 and 18 draws in, from the top of the cooking hob, a flow of primary air 41 which passes through the passages 40 to enter the respective cups 12 and 12' and from there is drawn along the conduits 50, to mix with the gas.
  • a flow of primary air 41 which passes through the passages 40 to enter the respective cups 12 and 12' and from there is drawn along the conduits 50, to mix with the gas.
  • the secondary air 45 for igniting and maintaining the flames which form the central ring 80 and the inner annular ring 82 originates from the top of the cooking hob and enters the annular cavity 34 through the openings 44, while the secondary air for igniting and maintaining the flames which form the outer annular ring 84 originates from the environment surrounding the burner 2.
  • FIG. 5 and 6 represents an improved gas burner 86 according to the invention in the dual version, i.e. in the version with the flame rings fed separately by two gas sources which are regulated independently.
  • an injector holder 88 comprising two gas inlets 90, 92 with which a traditional two-exit valve is associated (dual).
  • the upper end of the venturi conduits 50 projects and emerges from the base 53 of the annular distribution chamber 52.
  • the two lateral conduits 50 are configured such that the air and gas flow, which emerges therefrom and enters the annular distribution chamber 52, is substantially already completely mixed.
  • the height of the annular chamber 52 is greater than one half the radius of the lateral conduit 50 at its upper end.
  • the burner 86 presents a first gas inlet 90 facing a first conduit 94 communicating with the lateral injectors 16 and 18, and a second gas inlet 92 facing a second conduit 96 communicating with the central injector 14.
  • the first conduit 94 extends along the diameter of said injector holder 88, while the second conduit 96 has a length substantially equal to one half of said diameter and is disposed perpendicularly to and at a level slightly above the first conduit 94.
  • the annular portion 30 could also not present inner radial recesses 72; in that case there would be no annular ring of inwardly direct flames 82, and there would be only two flame rings, namely the central flame ring 80 and the annular flame ring 84 with flames directed outward.

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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)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)

Claims (13)

  1. Verbesserter Gasbrenner (2, 86), umfassend:
    - einen Einspritzdüsenhalter (4, 88), der mit Mitteln (20, 22) ausgestattet ist, die zum Einbau im oberen Blech eines Kochfelds geeignet sind, und umfassend einen becherförmigen zentralen Hohlraum (10) an dessen Basis eine zentrale Einspritzdüse (14) angelegt wird, und ferner umfassend zwei seitliche becherförmige Hohlräume (12, 12'), an deren Basis zwei seitliche Einspritzdüsen (16, 18) angelegt werden,
    - wenigstens einen Gaseinlass (6), der in dem Einspritzdüsenhalter (4, 88) vorgesehen und mit den Einspritzdüsen (14, 16, 18) verbunden ist,
    - einen Flammenteiler (24), der auf dem Einspritzdüsenhalter (4, 88) ruht und eine zentrale Verteilungskammer (48), die in ihrer im Wesentlichen zylinderförmigen Seitenwand mit Öffnungen (64) zur Erzeugung eines zentralen Flammenrings (80) ausgestattet ist, und eine ringförmige Verteilungskammer (52) definiert, die von der zentralen Verteilungskammer (48) durch einen ringförmigen Hohlraum (34) getrennt ist und in ihrer äußeren Seitenwand mit Öffnungen (66) zur Erzeugung einer Rings von nach außen gerichteten Flammen (84) ausgestattet ist,
    - eine kreisförmige Verschlussabdeckung (74) für die zentrale Verteilungskammer (48) und eine ringförmige Verschlussabdeckung (76) für die ringförmige Verteilungskammer (52),
    - wenigstens einen Verbindungsgang zwischen dem Raum um den Brenner (44) und dem ringförmigen Hohlraum (34) des Flammenteilers (24),
    - wobei die ringförmige Kammer (52) des Flammenteilers (24) zwei seitliche Leitungen (50) aufweist:
    - die mit ihrer Achse im Wesentlichen vertikal angeordnet sind,
    - deren untere Enden zu den seitlichen Einspritzdüsen (16, 18) weisen, und
    - die dahingehend ausgelegt sind, dass ein im Wesentlicher vertikaler Venturi-Effekt erzeugt wird, und dass die davon ausströmende und in die ringförmige Verteilungskammer (52) eintretende Gas- und Luftströmung im Wesentlichen bereits vollständig vermischt ist,
    dadurch gekennzeichnet, dass
    - die becherförmigen Hohlräume (10, 12, 12') sowohl an ihrer Basis als auch seitlich geschlossen sind, während sie nach oben offen sind,
    - die unteren Enden (60) der zwei seitlichen Leitungen (50) etwas höher angeordnet sind als der obere Rand (62) des Einspritzdüsenhalters (4, 88), und
    - die zwei seitlichen Leitungen (50) einen oberen Endabschnitt präsentieren, der hervorsteht und von der Basis (53) der ringförmigen Verteilungskammer (52) hervortritt.
  2. Brenner nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass am Auslass der zwei seitlichen Leitungen (50) in der ringförmigen Verteilungskammer (52) die Höhe der ringförmigen Verteilungskammer (52) größer als der halbe Radius der seitlichen Leitungen (50) an ihrem oberen Auslassende ist.
  3. Brenner nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die ringförmige Verteilungskammer (52) in ihren inneren Seitenwänden mit Öffnungen (68) zur Erzeugung eines weiteren Rings von nach innen gerichteten Flammen (82) ausgestattet ist.
  4. Brenner nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass jede der seitlichen Leitungen (50) des ringförmigen Abschnitts einen konvergierenden kegelstumpfförmigen unteren Abschnitt (54) und einen divergierenden kegelstumpfförmigen oberen Abschnitt (58) umfasst.
  5. Brenner nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass jede der seitlichen Leitungen (50) des ringförmigen Abschnitts auch einen im Wesentlichen zylindrischen Zwischenabschnitt (56) umfasst.
  6. Brenner nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Flammenteiler (24) mit dem Einspritzdüsenhalter (4, 88) Durchgänge (40, 42) zur Leitung der primären Luft (43), die von oberhalb des Kochfelds stammt, auf dem der Brenner eingebaut werden soll, in den zentralen becherförmigen Hohlraum (10) und in die seitlichen becherförmigen Hohlräume (12, 12') definiert.
  7. Brenner nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Flammenteiler (24) mit dem Einspritzdüsenhalter (4, 88) wenigstens einen Durchgang (44) zur Leitung der sekundären Luft (45), die von oberhalb Kochfelds stammt, auf dem der Brenner eingebaut werden soll, und die den zentralen Flammenring (80) und den inneren ringförmigen Flammenring (82) speisen soll, definiert.
  8. Brenner nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass wenigstens die kreisförmige Abdeckung (74) und/oder die ringförmige Abdeckung (76) durch Kaltpressen von Blech gefertigt werden.
  9. Brenner nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Flammenteiler (24) Zentrierelemente (78) zur eindeutigen Positionierung der ringförmigen Abdeckung (76) bezüglich des ringförmigen Abschnitts (30) des Flammenteilers umfasst.
  10. Brenner nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Flammenteiler (24) Zentrierelemente (78) für seine eindeutige Positionierung bezüglich des Einspritzdüsenhalters (4, 88) umfasst.
  11. Brenner nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass er einen einzelnen Gaseinlass (6) umfasst, der mit der Einspritzdüse (14) des zentralen becherförmigen Hohlraums (10) und mit den Einspritzdüsen (16, 18) der seitlichen becherförmigen Hohlräume (12, 12') verbunden ist.
  12. Brenner nach einem oder mehreren der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die Einspritzdüse (14) des zentralen becherförmigen Hohlraums (10) mit einem ersten Gaseinlass (92) verbunden ist, während die Einspritzdüsen (16, 18) der seitlichen becherförmigen Hohlräume (12, 12') mit einem zweiten Gaseinlass (90) verbunden sind.
  13. Brenner nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Flammenteiler (24) von den Wänden des zentralen becherförmigen Hohlraums (10) und von den Wänden der seitlichen becherförmigen Hohlräume (12, 12') des Einspritzdüsenhalters (4, 88) gestützt wird.
EP14733301.7A 2013-05-29 2014-05-28 Verbesserter gasbrenner Active EP3004737B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL14733301T PL3004737T3 (pl) 2013-05-29 2014-05-28 Udoskonalony palnik gazowy

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000027A ITVE20130027A1 (it) 2013-05-29 2013-05-29 Bruciatore a gas perfezionato.
PCT/IB2014/000901 WO2014191825A1 (en) 2013-05-29 2014-05-28 Improved gas burner

Publications (2)

Publication Number Publication Date
EP3004737A1 EP3004737A1 (de) 2016-04-13
EP3004737B1 true EP3004737B1 (de) 2016-09-21

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EP (1) EP3004737B1 (de)
BR (1) BR112015029887B1 (de)
ES (1) ES2608361T3 (de)
IT (1) ITVE20130027A1 (de)
MX (1) MX365461B (de)
PL (1) PL3004737T3 (de)
RU (1) RU2650455C2 (de)
WO (1) WO2014191825A1 (de)

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WO2019223402A1 (zh) * 2018-05-23 2019-11-28 宁波方太厨具有限公司 一种上进风灶具燃烧器

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CN106196048A (zh) * 2016-08-12 2016-12-07 宁波市鄞州姜山盛旺五金厂 一种汇流式燃气器及其制备方法
CN106439806A (zh) * 2016-08-12 2017-02-22 宁波市鄞州姜山盛旺五金厂 一种合体式燃烧器
CN106322375B (zh) * 2016-08-12 2018-09-14 宁波市鄞州姜山盛旺五金厂 一种双向式燃烧器
CN106322377B (zh) * 2016-08-12 2019-02-01 宁波市胜源技术转移有限公司 一种双向可拆式燃气器
CN106287695A (zh) * 2016-08-12 2017-01-04 宁波市鄞州姜山盛旺五金厂 一种单侧式燃气器及其制备方法
CN106152130B (zh) * 2016-08-12 2018-11-16 宁波市鄞州姜山盛旺五金厂 一种双向合体式燃烧器
CN106287694B (zh) * 2016-08-12 2019-02-01 宁波市胜源技术转移有限公司 一种燃气灶的三环燃气器
EP3425276B1 (de) * 2017-07-07 2022-06-01 Electrolux Appliances Aktiebolag Kochfeld mit einem gasbrenner
WO2023101634A1 (en) * 2021-11-30 2023-06-08 Turaş Gaz Armatürleri̇ San. Ve Ti̇c. A.Ş. A multi-gas burner for increasing efficiency
WO2023152652A1 (en) * 2022-02-11 2023-08-17 E.G.O. Elektro-Gerätebau GmbH An improved gas burner

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Publication number Priority date Publication date Assignee Title
WO2019223402A1 (zh) * 2018-05-23 2019-11-28 宁波方太厨具有限公司 一种上进风灶具燃烧器

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BR112015029887A2 (pt) 2017-07-25
ES2608361T3 (es) 2017-04-10
WO2014191825A1 (en) 2014-12-04
RU2650455C2 (ru) 2018-04-13
MX365461B (es) 2019-06-04
RU2015153744A (ru) 2017-06-20
EP3004737A1 (de) 2016-04-13
PL3004737T3 (pl) 2017-05-31
MX2015016409A (es) 2016-05-18
ITVE20130027A1 (it) 2014-11-30
BR112015029887B1 (pt) 2021-08-31

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