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
  • 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.
• Single control gas burners with m ultiple concentric flame rings are known, i.e. burners in which the gas feed is controlled by a single tap.
• These generally comprise an injector holder cup, a flame d ivider resting on the injector holder cup and formed from two parts joined together to define an inner central chamber and an outer annular chamber, a discoidal cover which upperly bounds the central chamber of the flame divider, and an annular cover which upperly bounds the annular chamber of the flame divider.
• EP 797048 which comprises five elements: a lower cup-shaped support, an intermediate cylindrical element, a head comprising an inner circular chamber and an outer annular chamber, and two closure covers for said chambers.
• gas burners with m ultiple flame rings have been proposed, formed from four or three elements.
• EP 2572141 describes a gas burner with multiple flame rings comprising an injector holder and a flame divider defin ing an outer annular cham ber and an inner circular cham ber, both closed upperly by a single cover.
• the injector holder comprises two cup-shaped supports and two vertical injectors positioned in a diametrical plane and facing two vertical conduits, which are defined within the flame divider and open upperly into respective arched rad ial cham bers of venturi effect defined in the outer annular chamber.
• each arched chamber is fluidically connected to the burner inner chamber via two radial channels.
• An object of the invention is to provide a gas burner with only three components, and/or in any event a reduced number of components.
• Another object of the invention is to provide a gas burner obtainable at very low production cost.
• Another object of the invention is to provide a gas burner which is installable with extreme ease, rapidity and safety.
• Another object of the invention is to provide a gas burner in which the flame distribution is uniform along its entire extension.
• Another object of the invention is to provide a gas burner using either injector holder cups in wh ich the prim ary air is drawn in from below the cooking hob (such as those widespread in certain countries, such as Brazil), or injector holder cups in which the primary air is drawn in from above the cooking hob (such as those widespread mainly in Europe and the Middle East).
• Figure 1 is an exploded perspective view of a first installation of the burner according to the invention, seen from above,
• Figure 2 is an exploded perspective view thereof seen from below
• Figure 3 is a vertical section therethrough in the assembled configuration
• Figure 4 shows a second installation thereof in the same view as Figure 1
• Figure 5 is an exploded perspective view of the instal lation of Figure 4 thereof seen from below
• Figure 6 is a vertical section through the installation of Figure 4 shown in the assembled configuration
• Figure 7 shows the flame divider of the burner of Figures 1 -6 in plan view
• Figure 8 is a plan view showing a cover applicable to the flame divider of
• Figure 7 is a plan view showing a different embodiment of the flame divider of the burner according to the invention.
• Figure 10 is a plan view showing a cover applicable to the flame divider both of Figure 7 and of Figure 9.
• the burner 2 accord ing to the invention comprises a flame divider 4, installable on an injector holder 6, and a cover 8.
• the injector holder 6 is of traditional type and adheres from below to the sheet metal of a cooking hob 10 to which the burner is intended to be fixed by screws.
• the injector holder 6 can also pertain to a different burner which had been previously mounted on the cooking hob 10, so making its installation particularly easy for the user.
• the injector holder 6 comprises a dish 1 2 provided with lateral apertures 1 3 for entry of primary air withdrawn from below the cooking hob.
• the lateral wall of the dish 12 is provided with a flange 14 projecting outwards, to adhere to the sheet metal of the cooking hob 1 0 from below.
• said lateral wall extends above the flange 1 4 to define a collar 1 5 on which the flame divider 4 rests and is supported.
• the injector holder 6 with dish 12 is particularly advantageous as it is small and compact, and moreover, by drawing the primary air from below the cooking hob 1 0, it does not require large dimensions to increase the burner power.
• the injector holder 6 com prises a support shaped as a cup 1 6, completely closed both lowerly and laterally and open at the top, where the lateral wall is provided with a flange 14 jutting outwards to adhere from below to the edge of the aperture provided in the sheet metal of the cooking hob 10, for installing the burner.
• the lateral wall of the cup 16 extends upwards beyond the flange 14 to define an emerging rim 1 7, form ing the element on which flame divider 4 rests.
• the flame divider 4 is rested on the injector holder 6 such that between these a passage is defined to enable primary air 19 to enter the cup 16 of the injector holder 6 from above the cooking hob 10.
• the injector holder with cup 16 is particularly advantageous in that, by withdrawing primary air from above the cooking hob 1 0, it is practical ly insensible to the streaming phenomenon; however, in this case, to increase burner power, the cup dimensions must be increased.
• the injector holder 6 comprises a gas feed conduit 20. It extends horizontally below the bottom of the dish 12 or cup 1 6 of the injector holder 6, it is open at one end 21 for air entry, and communicates with a vertical injector 22 screwed centrally to the base of the injector holder.
• Both the aforedescribed installations i. e. both the first installation represented in Figures 1 -3 and the second installation represented in Figures 4-6) are configured to restingly receive the same flame divider 4.
• the flame divider 4 comprises an outer chamber 26 of overall annular shape, and an inner chamber 28 of overall circular shape, between which at least one cavity 29 is defined.
• a tubular conduit 30 extends downwards from the inner chamber 28 of the flame d ivider 4 and , if used with the injector holder with d ish 1 2 , is inserted into the collar 15 of the cup until the upper edge of said collar 1 5 abuts against the lower surface 27 of the flange surrounding the tubular conduit 30.
• this contact between the upper edge of the collar 15 and the lower surface of the flange 27 which surrounds the tubular conduit 30 of the flame divider 4 defines a sealed closure which prevents primary air from entering the d ish 1 2 from above the cooki ng hob.
• centring is suitably ensured by the insertion of the tubular part 30 of the flame divider 4 into the collar 15 of the injector holder 6.
• downwardly extending shaped projections 23 are provided on the lower surface of the flange 27 of the flame divider 4.
• these projections 23 engage recessed parts 31 provided on the inner surface of the lateral wall of the cup 16, in such a manner as to define, between the flame divider 4 and the cup of the injector holder 6, apertures to enable primary air 1 9 to enter the cup 16 from above the cooking hob 1 0 (see Figure 6).
• the connection between said shaped projections 23 and the recessed parts 31 also facilitates centring of the flame divider 4 relative to the injector holder with cup 16.
• the manner in which the flame divider 4 rests on the injector holder 6 is such that the flame divider is spaced from the sheet metal 1 0 of the cooking hob to such an extent as to determ ine passages therewith for the secondary air 25 intended for the flames which emerge from the cavity 29 of the flame divider 4.
• the outer annular chamber 26 of the flame divider 4 presents an outer wall 32 which extends along a cylindrical surface, and an inner wall 34, a certain part of which extends concentrically to the outer wall 32, but then connects to parts substantially radial to the cylindrical wall 35 of the inner chamber 28.
• second shaped projections 39 are provided on the lower surface of the outer annular chamber 26 to prevent unbalance, disequilibrium or incorrect positioning of the flame divider 4 in the case of involuntary contacts thereof.
• the outer annular chamber 26 of the flame divider 4 is connected fluidically to the inner chamber 28 via two substantially radial channels 36 (diametrically aligned) which divide the space between the outer annular chamber 26 and the inner circular chamber 28 into two symmetrical cavities 29.
• the outer annular chamber 26 is divided into two arched sectors 39 separated from each other by two diametrically opposite passages 41 forming two inter- ignition channels between the inner cavities 29 of the flame divider 4 and the outside.
• the outer annular chamber 26 is connected fluidically to the inner circular chamber 28 via four substantially radial channels 36 (disposed substantially at 90° apart), which divide the space between the outer annular chamber 26 and the inner circular chamber 28 into four equal cavities 29.
• the outer annular chamber 26 is divided into four sectors 39 separated from each other by four passages 41 forming four inter-ignition channels.
• the outer annular chamber 26 and the i nner circu lar cham ber 28 of the flam e d ivider 4 are fl u id ical ly connected together by a single channel 36.
• a single channel 36 there is a single cavity 29, which surrounds the inner circular chamber 28, and a single inter- ignition channel 41 .
• the outer annular chamber 26 and the inner circular chamber 28 are bounded by a sing le continuous wal l wh ich is provided , along its entire extension with the exception of the parts relative to the radial channel or channels 36, with a plurality of ports for the exit of the primary gas/air mixture and the generation of at least two flame rings.
• Said ports suitably comprise main ports 42 and secondary ports 43 (see Figures 1 , 2, 4 and 5).
• said ports 42 and 43 are defined in the outer wall 32 of the outer annular chamber 26, to generate a first ring of outward directed flames, i n the i n ner wa l l 34 of the outer ann u lar cham ber 26 , to generate an intermediate second ring of flames which open into the cavity 29, and in the lateral wall 35 of the inner chamber 28, to generate an internal third ring of flames which also open into the cavity 29.
• only two flame rings can be provided, one fed via the ports 42, 43 provided in the outer wall 32 of the outer annular chamber 26, and the other fed via the ports 42, 43 provided in the inner wall 34 of the outer annular chamber or, alternatively, provided in the lateral wall 35 of the inner circular chamber 28 of the flame divider 4.
• the tubular conduit 30 of the flame divider 4 defines a vertical channel 46 the bottom of which faces the injector 22 mounted on the injector holder 6 and upperly opens into a radial cham ber 47 of venturi effect, bounded circumferentially by the wall 35 of the inner chamber 28, bounded lowerly by a base 49, and bounded upperly by a cover 8, the position of which, relatively to the flame divider 4, is defined by four centring pegs 50 provided therein.
• curved bulkheads 37 carrying a central passage aperture are provided between the circumferential wall 35 of the inner chamber 28 and the upper end of the tubular conduit 30, to define arched under-chambers in cooperation with the circumferential wall 35.
• the m ixture leaving the tubular conduit 30 enters the arched under-cham bers via the passage aperture defined in the curved bulkheads 37, and emerges from these via the ports 42, 43 provided in the lateral wall 35 of the inner circular chamber 28 of the flame divider 4.
• the mixture leaving the tubular conduit 30 is slowed down to prevent flame detachment and to provided greater stability to the main flame ring fed via the ports 42, 43 provided in the circumferential wall 35 of the inner circular chamber 28.
• the cover 8 is made in one piece and comprises an outer annular portion 52, an inner discoidal portion 54 and four shaped radial portions 56 the purpose of which is to connect together the outer portion 52 and the inner portion 54 and to upperly close the channels 36 and/or the passages 41 .
• the cover represented in Figure 8 which is adapted to rest on the flame divider of Figures 1 , 4 and 7, two diametrically aligned radial connection portions 56 are provided for upperly closing the two channels 36 of the flame divider 4.
• the cover 8 can com prise a sing le radial portion 56 for connecting the inner discoidal portion 52 to the outer annular portion 56, to upperly close said radial channel 36.
• the bu rner accord i ng to the invention operates in the following manner.
• the gas entering through the inlet aperture 21 from the conduit 20 emerges from the injector 22 and enters the vertical conduit 46 of the flame divider 4, entraining with it the primary air.
• This can be drawn from below the cooking hob 1 0, in the case of an injector holder 6 with dish 12 (see Figures 1 -3) or, alternatively, from above the cooking hob 1 0, in the case of a cup injector holder 6, following the path indicated by the arrow 19 of Figure 6.
• the mixture obtained in this manner can thus feed the inner flame ring leaving the ports 42 of the inner circular chamber 28.
• the mixture propagates along the channels 36, closed upperly by the connecting portions 56 of the cover 8, to reach the outer annular chamber 26 of the flame divider 4 to feed the outer flame ring and, if provided, also the intermediate flame ring.
• the injector holder 6 su itably com prises a support arm 60 for an ignition spark plug 62.
• the burner according to the invention is m uch m ore advantageous than trad itiona l m u lti-flame ring burners, and in particular:
• the cover is also constructed in one piece, this also making the burner production extremely simple and economical
• burners it enables burners to be constructed in which the same flame divider and the same cover can be applied both on an injector holder with primary air intake from below the cooking hob, and on an injector holder with primary air intake from above the cooking hob, and, finally on already existing injector holders of standard dimensions,
• the assembly of the three components is made particularly easy, quick and intuitive.
• the burner according to the invention is different from and more advantageous than traditional burners in that, besides consisting of only three com ponents (the injector holder, the flame divider and the cover), it presents at the sam e t i m e a flam e d istri but ion wh ich i s uniform and homogeneous along its entire circumferential development.

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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)

Applications Claiming Priority (2)

Publications (2)

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ID=53053056

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Cited By (1)

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• 2016
  • 2016-03-09 WO PCT/IB2016/051326 patent/WO2016142872A1/en not_active Ceased
  • 2016-03-09 ES ES16718457T patent/ES2854279T3/es active Active
  • 2016-03-09 RU RU2017130719A patent/RU2701432C2/ru active
  • 2016-03-09 MX MX2017011520A patent/MX2017011520A/es unknown
  • 2016-03-09 EP EP16718457.1A patent/EP3268667B1/de active Active

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