EP2986913A1 - Gas burner for cooking hobs - Google Patents

Gas burner for cooking hobs

Info

Publication number
EP2986913A1
EP2986913A1 EP13745165.4A EP13745165A EP2986913A1 EP 2986913 A1 EP2986913 A1 EP 2986913A1 EP 13745165 A EP13745165 A EP 13745165A EP 2986913 A1 EP2986913 A1 EP 2986913A1
Authority
EP
European Patent Office
Prior art keywords
burner
secondary air
ductwork
inflow
mixer
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
EP13745165.4A
Other languages
German (de)
French (fr)
Other versions
EP2986913B1 (en
Inventor
Massimo DORA
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.)
Sabaf SpA
Original Assignee
Sabaf 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 Sabaf SpA filed Critical Sabaf SpA
Priority to PL13745165T priority Critical patent/PL2986913T3/en
Publication of EP2986913A1 publication Critical patent/EP2986913A1/en
Application granted granted Critical
Publication of EP2986913B1 publication Critical patent/EP2986913B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F23D14/08—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
    • 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 concerns a gas burner for cooking hobs, in particular domestic cooking hobs, of the so called "flat" type, in which the flame holes, that is the outflow sections of fuel mixture, of at least one flame spreader, are substantially tilted with respect to the horizontal line of an angle comprised between 0° and 30°, so that the flames produced by such a flame spreader will leave from the latter along a substantially vertical axis.
  • outflow sections substantially tilted with respect to the horizontal line of a certain angle
  • outflow areas of mixture composed of fuel gas/primary air of the flame spreaders of a certain flame spreader will substantially lie on curved planes, or surfaces, with a wide curvature radius then being similar to planes inclined of the reported angle with respect to the horizontal line.
  • flame hole it is meant every opening having a section of any shape, obtained in the flame spreader and designed to deliver the mixture composed of fuel gas/primary air to be ignited.
  • flame holes could have any geometrical shape, for example they can have an oval or rectangular or circular shape, and preferably they have an outflow section of the fuel mixture that is substantially flat, even if the section is not necessarily obtained on a flat surface.
  • Such a burner type which is usually named "flat” burner, has a flame spreader comprising at least one horizontal surface, or zones tilted of few degrees with respect to the horizontal line, on which there are the aforesaid outflow sections of the fuel mixture that, when the burner is ignited, produce a plurality of flames departing substantially vertically from the flame spreader and that are usually close one to another.
  • the European Patent EP-A-1249665 in the name of WHIRPOOL teaches to implement a similar burner in which the flame spreader, being dome shaped, has a plurality of slits with a substantially horizontal outlet section composing the flame holes of the aforesaid burner.
  • Such a burner type for cooking hobs usually fed through a mixer for example of the Venturi type, which feeds a mixture of fuel gas/primary air to a distribution chamber obtained in the burner body and fluidically connected to the aforesaid flame spreader, usually has the drawback that, because of the arrangement of the flames and their nearness one to another in such a burner, the inflow of secondary air to the flames, which is necessary to have the correct stoichiometric relation between the fuel gas and oxygen for the combustion, is usually not sufficient, so that the mixture combustion is not complete or sufficient and could sometime produce unacceptable amounts of noxious substances.
  • the inflow of secondary air at the holes of the flame/s, which are placed in the interior on the flame spreader is usually impeded, or impaired, by the flames emanating to the outside on the same flame spreader.
  • the Patent Application EP-A-2072901 in the name of CANDY describes a cooking hob provided with "flat" burners which have, in a central position with respect to the flame spreaders, an opening for feeding secondary air supplied through a forced ventilation system.
  • the flow of secondary air being just a forced flow, can be accurately adjusted so that the combustion of fuel mixture in the aforesaid burners will be substantially optimal.
  • such a result is obtained with a great increase of the complexity of the cooking hob and then of the final cost of such a component.
  • the use of an equipment for producing a flow of forced air obviously decreases the overall reliability of the cooking hob.
  • the Australian Patent AU-B-312372 in the name of MALLEYS Ltd. describes a burner provided with flame holes which have substantially horizontal outflow section, the burner having, at the upper lid of the burner, in the center of the flame holes, an opening for feeding the secondary air.
  • Such an opening is connected, through a ductwork extending inside the burner body and the respective cup, to a zone beneath the burner cup, and then beneath the cooking hob, from which therefore the secondary air flows.
  • a further object of the present invention is to provide a burner of the afore referred type having an effective combustion of the fuel mixture feeding it, without the need to be coupled to complex devices of forced ventilation for its operation.
  • the gas burner according to the present invention comprises a burner cup provided with at least one ejection nozzle of the fuel gas, which is integral with a cooking hob or provided with means for the connection to the latter; at least one mixer of the fuel gas with primary air placed downstream of the ejector nozzle and fed with fuel gas through such a nozzle; a burner body removably coupled to the cup of the burner and comprising at least one distribution chamber for the mixture composed of fuel gas/primary air placed downstream of the mixer; and at least one flame spreader, coupled to the aforesaid distribution chamber, which is provided with flame holes having respective outflow sections lying substantially on one or more planes inclined of an angle comprised in the range 0° - 30°, that is an angle greater or equal to 0° and lower or equal to 30°, with respect to the horizontal line, and in which such a flame spreader has a preferably annular shape,
  • the burner body comprises at least part of the structure of at least one inflow ductwork for the flow of the secondary air towards said central opening for the outflow of the secondary air, and such an inflow ductwork of secondary air has its own drawing section to draw secondary air which opens over the cooking hob.
  • the draw of secondary air from above the cooking hob preferably in a zone sufficiently distant from the flame holes, far from being ineffective, allows a sufficient intake of secondary air to the flames of the afore described "flat" burner and then an effective combustion of the fuel mixture.
  • the drawing section of the inflow ductwork of secondary air opens at a distance from the central opening for the outflow of secondary air and from the flame holes of the flame spreader and in particular, preferably, it opens at a distance greater than 10 mm from the closest flame hole.
  • the burner comprises at least one inflow ductwork for the primary air, fluidically connected to the aforesaid mixer, having the drawing section to draw primary air indifferently placed over or beneath the cooking hob.
  • drawing section is meant the area of that opening directly belonging, or anyway fluidically connected, to the respective ductwork, which allows the income of primary or secondary air into the same ductwork.
  • drawing section will be completely or only partially obtained in the body or cup of the burner, or it will be obtained in the cooking hob or made in a body coupled to the burner, as long as fluidically connected to the respective inflow ductwork.
  • the aforesaid mixer can be a mixer with Venturi effect with radial expansion or a mixer with Venturi effect with axial expansion.
  • FIG. 1 shows a gas burner for cooking hobs according to a particular embodiment of the present invention seen in a top plan view;
  • FIG. 2 is a side section view according to the line A-A of figure 1 of the gas burner of the preceding figure;
  • FIG. 3 is a side section view according to the line B-B of the gas burner represented in figures 1 and 2;
  • FIG. 4 is a perspective view of a gas burner for cooking hobs according to a different embodiment of the present invention.
  • figure 5 is a side section view of the gas burner shown in figure 4.
  • the gas burner 1 for cooking hobs 2 depicted in figures 1-3 comprises a cup 3 constrained and/or integral to the cooking hob 2, and extended beneath the latter, and having an ejection nozzle 4 for the fuel gas, a body 6.1, 6.2 of the burner, removably assembled on top of the cup 2 and provided with a mixer 7 of primary air I - fuel gas, fluidically placed downstream of the nozzle 4, and at least part of a distribution chamber 8 of the fuel mixture, fluidically placed downstream of the mixer 7, as well as a flame spreader 9 provided with a plurality of flame holes 18, and preferably having a substantially annular shape, placed over the body 6.1, 6.2 of the burner so that to be fluidically coupled to the distribution chamber 8.
  • cup of the burner, as the person skilled in the art knows, it is generically meant the burner component intended to be fixed to the cooking hob and arranged to support at least one ejection nozzle of the fuel gas connected to the gas distribution system.
  • mixer is meant that component, sometimes associated at least in part with the cup and/or with the body of the burner, and interposed between, or belonging to, such components, that is able to mix the fuel gas coming from the aforesaid nozzle and a flow of primary air coming from the outside of the burner.
  • a mixer can be, and preferably is, a Venturi tube of the type with radial expansion or with axial expansion.
  • burner body such a component, e.g. coupled by juxtaposing complementary parts to the top of the cup, defining at least a distribution chamber of the mixture, fluidically connected to the outlet section of the aforesaid mixer, arranged to be coupled to a flame spreader.
  • flame spreader component of the burner, usually constrained to the top of the burner body and fluidically connected to the aforesaid distribution chamber, having a plurality of flame holes, i.e. holes intended to allow the fuel mixture to be delivered outwards (i.e. the mixture of fuel gas/primary air formed in the mixer), so that the combustion of such a mixture would become possible with the intake of an appropriate volume of secondary air.
  • burner components that is the "cup”, the “burner body”, the “mixer” and the “flame spreader” are not necessarily composed exclusively by monolithic bodies, but they can be composed as well by several parts stably assembled or coupled one to another.
  • the mixer could be indifferently obtained in the cup and/or the burner body, or else it could be a distinct body, simply coupled to such a cup and/or burner body.
  • the cup 3 of the burner is provided with means for connecting to the cooking hob 2, herein not shown, but quite ordinary in burners known in the art, and for example composed of flat springs, and/or threads or bolts and/or embedments through complementary parts, and it is shaped so as to allow the coupling of the body 6.1 , 6.2 of the burner in an upper position.
  • Such a cup 3 of the burner composed of an usually metallic hollow body, comprises as well an ejection nozzle 4 of the fuel gas connected, or connectable, to the domestic gas distribution system, which is arranged inside the hollow zone 5 of the cup 3 so as to have the gas ejection axis directed towards the inlet section of the mixer 7 to mix the primary air I with the fuel gas, as will become evident in the following.
  • the burner body comprises a first lower component 6.1, on which at least part of a mixer 7 is obtained for mixing primary air I with fuel gas, and a second upper component 6.2 mechanically connected to the upper component, and carrying at least part of a distribution chamber 8 of the mixture of fuel gas/primary air, the chamber being placed downstream of the mixer 7 and fluidically communicating with the latter.
  • the mixer 7 is a Venturi effect mixer with radial expansion - also known as "radial Venturi” - comprising, as known in the art, a vertical axis duct tapered upwardly and opening over an expansion chamber with a horizontal development, that is composed of two opposed walls closed one to another, so that the main dimensions of such a chamber lie on a substantially horizontal plane.
  • radial Venturi 7 herein illustrated, the tapered duct with vertical axis, together with the lower walls of the expansion chamber, is obtained in the first lower component 6.1 of the burner body, whereas the upper walls of the expansion chamber are obtained in the second upper component 6.2 of said burner body.
  • the inlet section of the tapered vertical duct of the radial Venturi 7 opens into a hollow zone 5 defined by the cup 3 so that such an ejection nozzle 4 directs its own flow of fuel gas into such a vertical tapered duct and so that the primary air I reaching the cup 3 is withdrawn, precisely thanks to the Venturi effect, into such a vertical tapered duct.
  • the first lower component 6.1 of the burner body is shaped to realize, when coupled to the cup 3 and the cooking hob 2, i.e. to the upper wall of the latter, some ductworks 12.1, 12.2 having respectively a drawing section 13.1, 13.2 of the primary air I placed over the cooking hob 2 and a development, defined by the lower walls of the first component 6.1 of the burner body and by upper walls of the cooking hob 2, that leads the primary air I, withdrawn by the radial Venturi 7, into the concave zone 5 of the cup 3.
  • the drawing sections 13.1, 13.2 of the primary air I are preferably placed at a certain distance from the flame spreader 9 and, in particular, from the respective flame holes 18.
  • the expansion chamber of the radial Venturi 7, placed downstream of the more restricted section of the vertical tapered duct of the radial Venturi, is placed in fiuidic communication, as mentioned, with a distribution chamber 8 of the fuel mixture, having an annular shape and obtained, at least in part, in the second lower component 6.2 of the burner body.
  • the flame holes 18 of the substantially flat flame spreader 9 encircle the central opening 10 intended, as mentioned, for the outflow of secondary air II into the flames giving off from the flame spreader 9.
  • the central opening 10, intended to allow the outflow of secondary air II directed towards the flames coming out from the flame spreader 9, is fluidically connected to the ductworks 16.1, 16.2 that are obtained at least in part inside the body of the burner 6.1, 6.2 and respectively have drawing sections 17.1, 17.2 for the secondary air II placed over the cooking hob 2, so as to allow the inflow of secondary air II drawn from these sections 17.1, 17.2 to the central opening 10.
  • the drawing sections 17.1, 17.2 of the ductworks 16.1, 16.2 for the secondary air II are placed at a distance from the central opening 10 for the outflow of secondary air II and/or from the flame holes 18 of the flame spreader 9, so as to decrease the influence of flames and the respective heat emitted therefrom on the drawn flow of secondary air II.
  • drawing sections 17.1, 17.2 to draw the secondary air II are arranged at a distance greater than 10 mm from the closest flame hole and, in case wherein the burner 1 comprises also a supporting grid 14, 15 for cooking vessels, the drawing sections 17.1, 17.2 of the ductworks 16.1, 16.2 for the secondary air II can be arranged at or beyond such a supporting grid 14 with respect to the flame spreader 9.
  • the drawing sections 17.1, 17.2 to draw the secondary air II are preferably arranged at a distance greater than 10 mm from the circumference of the flame holes 18 that is farthest from the central opening 10 for the outflow of the secondary air II.
  • the ductworks 16.1, 16.2 for the secondary air II similarly to those 12.1, 12.2 for the primary air, have a structure made at least in part in the body of the burner 6.1, 6.2 and at least in part have a structure comprising as well at least one zone defined at least in part by the cooking hob 2, in particular in the herein represented burner 1.
  • the ductworks 16.1, 16.2 for the secondary air II are respectively composed by ductwork lengths obtained in the burner body, thanks to the mutual assembly of the aforesaid first and second component 6.1, 6.2, and by ductwork lengths defined at least on bottom by walls of the cooking hob 2 and, on top, by lower walls of a supporting grid 14, 15 for cooking vessels, such as pots or pans.
  • the burner 1 may comprise ductworks that, starting from one or more drawing sections to draw atmospheric air which are placed over the cooking hob 2, and commonly to such ductworks, have a branch whereby a part of these ductworks is shaped to direct the (primary) air towards the mixer 7 and another part of these ductworks is shaped to direct the (secondary) air towards the central opening 10 of the burner.
  • the herein described burner 1 comprises, according to a particular aspect of the present invention, a supporting grid 14, 15 for cooking vessels, composed of a substantially annular base 14 having resting arms 15 adapted to bear the cooking vessels.
  • the drawing sections 17.1, 17.2 of the ductworks 16.1, 16.2 for the secondary air II and, furthermore or alternatively, the drawing sections 13.1, 13.2 of the ductworks 12.1, 12.2 for the primary air I can be obtained in the same supporting grid 14, 15, and in particular in the base 14 of such a supporting grid.
  • the burner 1 is further completed, as known in the art, by at least one ignition spark plug and a safety device, for example comprising a thermocouple, in order to avoid gas leakage in case of accidental flame blowing out, herein not represented.
  • a safety device for example comprising a thermocouple
  • the mixture made by the mixer 7 flows into the distribution chamber 8 obtained in the burner body 6.1, 6.2, and from here it reaches the flame holes 18 of the flame spreader 9.
  • a firing for example composed of a spark generated by an ignition spark plug, allows the combustion of the fuel mixture, also due to the presence of atmospheric air constituting the secondary air II for the fuel mixture.
  • a gas burner 101 is visible and comprises, similarly to the burner 1 of figures 1 to 3, a cup 103 integral with, or provided with connecting means to, a cooking hob 102 and comprising an ejection nozzle 104 of fuel gas, a mixer 107 of the fuel gas with primary air I, placed downstream of the nozzle 104 and obtained at least in part in the cup 103, a burner body 106, removably coupled to the cup 103, of the burner 101 and comprising at least part of a distribution chamber 108 of the mixture composed of fuel gas/primary air I, placed downstream of the mixer 107, as well as a flame spreader 109 coupled to the distribution chamber 108 and provided with flame holes 118 having respective outflow sections which substantially lie on one or more plane inclined with respect to the horizontal line of an angle between 0° and 30°.
  • the flame spreader 109 of the burner 101 identically to the flame spreader 9 of the burner 1, comprises, in a central position, encircled by the flame holes 118, a central opening 110 designed for the outflow of secondary air II directed towards the flames of the same flame spreader 109, and surmounted by a lid 111, the latter being placed at a distance from the opening 110 itself in order to allow the flow of secondary air II.
  • the burner 101 comprises as well a ductwork 116, obtained at least in part in the body 106 of the burner, for the inflow of secondary air II that has its own drawing section 117 to draw the secondary air II placed over the cooking hob 2 and connects such a drawing section 117 to the central opening 110 of the flame spreader 109.
  • the ductwork 116 for the secondary air II comprises a first length obtained by coupling the body of the burner 106 with the cup 103, that is by coupling the wall belonging to such components of the burner 101, and a second length defined at least in part by the cooking hob 102, and specifically also by walls of a supporting grid 114, 115 for the cooking vessels.
  • the respective drawing section 117 to draw secondary air II is realized over the cooking hob 102, between the grid 114, 115 and the upper surface of the cooking hob 2.
  • the body of the burner 106 also comprises, in addition to part of the ductwork 116 for the secondary air II, part of the structure of a ductwork 112 for the primary air I, provided with a drawing section 113 to draw the same primary air I placed over the cooking hob 102 and shaped so as to allow the inflow of primary air I into a well 105 placed immediately downstream of the ejection nozzle 104 of fuel gas, defined by the cup 103.
  • the ductwork 112 for the primary air I similarly to the ductwork 116 for the secondary air II, is defined in part by the coupling of the body of the burner 106 with the cup 103 and in party by the coupling of the aforesaid supporting grid 114, 115 for cooking vessels with the upper surface of the cooking hob 102.
  • the possible arrangement of the drawing section 113 to draw primary air I beneath the cooking hob 102 - herein not shown - falls anyway in the requested scope of protection of the invention.
  • the primary air I coming from the ductwork 116 meets the aforesaid well 105 and, downstream of the latter, the mixer 107 composed, in the herein described burner 101, of a Venturi tube with axial expansion - herein named also as axial Venturi - horizontally arranged in the cup 103 and adapted to axially receive the flow of fuel gas emitted from the ejection nozzle 104.
  • Such an axial Venturi 107 is composed of a restricted inlet section, placed downstream of the well 105, and an expansion section, composed of a truncated cone duct, whose section gradually widens in the axial direction from the aforesaid restricted inlet section.
  • a passage is provided at the outlet of the expansion section of the axial Venturi 107, inside which the just formed fuel mixture passes, the passage being directed to the aforesaid substantially annular distribution chamber 108 defined in part by the body of the burner 106 and in part by the same flame spreader 109, the latter limiting the chamber 108 on top.
  • the flame spreader 109 has, as mentioned, a plurality of flame holes 118 having a substantially elliptical shape, communicating with the distribution chamber 118 and disposed around the central opening 110 for the outflow of secondary air II.
  • the burner 110 comprises a supporting grid 114, 115 composed of a base 114, shaped to couple with the body of the burner 106 and/or with the cooking hob 2 so that to encircle the flame spreader 9, and of a plurality of resting arms 115 to support a cooking vessel, such a skillet, a pan or similar.
  • the base 114 of such a supporting grid defines partially the ductworks 112, 116 for the inflow of primary air I and secondary air II in cooperation with some upper parts of the cooking hob 102.
  • At least one ignition spark plug and one safety device for example of the type comprising a thermocouple, herein not represented, complete the burner 101.
  • the operation of the burner 101 is completely similar to the operation of the burner 1 and to the latter reference is made.
  • the use of a different mixer 107 does not modify the operation tenet of the burner 101 with respect to the afore shown burner 1, as the presence of a different number of ductworks for the primary air I and secondary air II does not modify it.
  • the Applicant noticed that the presence of means for allowing the natural inflow of secondary air from the above of the cooking hob towards the center of the flat burner, of the afore defined type, i.e. without the use of devices for causing a forced flow of secondary air or without drawing secondary air from the beneath of the cooking hob, revealed to be able to allow an efficient combustion.

Abstract

Gas burner comprising a burner cup provided with at least one ejection nozzle of the fuel gas, integral with or constrained to a cooking hob; at least one mixer of the fuel gas with primary air placed downstream of the ejector nozzle and fed with fuel gas through such a nozzle; a burner body removably coupled to the cup of the burner and comprising at least one distribution chamber of the mixture composed of fuel gas/primary air placed downstream of the mixer; and at least one flame spreader coupled to the aforesaid distribution chamber and provided with flame holes having respective outflow sections lying on one or more planes, or having respective tangent planes, inclined of an angle comprised in the range 0° - 30° with respect to the horizontal line, and in which such a flame spreader has a central opening for the outflow of the secondary air. Advantageously, the burner body comprises at least part of the structure of at least one inflow ductwork of the secondary air towards said central opening for the outflow of the secondary air, and such an inflow ductwork of secondary air has its own drawing section to draw secondary air which opens over the cooking hob.

Description

"GAS BURNER FOR COOKING HOBS"
* * * *
FIELD OF THE INVENTION
The present invention concerns a gas burner for cooking hobs, in particular domestic cooking hobs, of the so called "flat" type, in which the flame holes, that is the outflow sections of fuel mixture, of at least one flame spreader, are substantially tilted with respect to the horizontal line of an angle comprised between 0° and 30°, so that the flames produced by such a flame spreader will leave from the latter along a substantially vertical axis.
It has to be noted that, herein and after, with the term "outflow sections substantially tilted with respect to the horizontal line" of a certain angle, it is meant that the outflow areas of mixture composed of fuel gas/primary air of the flame spreaders of a certain flame spreader will substantially lie on curved planes, or surfaces, with a wide curvature radius then being similar to planes inclined of the reported angle with respect to the horizontal line.
Furthermore it has to be noticed that with the term "flame hole" it is meant every opening having a section of any shape, obtained in the flame spreader and designed to deliver the mixture composed of fuel gas/primary air to be ignited. Then such "flame holes" could have any geometrical shape, for example they can have an oval or rectangular or circular shape, and preferably they have an outflow section of the fuel mixture that is substantially flat, even if the section is not necessarily obtained on a flat surface.
KNOWN PREVIOUS ART
It is known art to realize gas burners, in particular for domestic cooking hobs, provided with a flame spreader comprising a plurality of outflow sections of the mixture composed of fuel gas/primary air which lie substantially on a horizontal plane or planes that are only slightly inclined with respect to the horizontal line, so that also the flame spreader would preferably take a substantially horizontal shape or a dome- or spherical cap-like shape, with a wide curvature radius.
Thereby such a burner type, which is usually named "flat" burner, has a flame spreader comprising at least one horizontal surface, or zones tilted of few degrees with respect to the horizontal line, on which there are the aforesaid outflow sections of the fuel mixture that, when the burner is ignited, produce a plurality of flames departing substantially vertically from the flame spreader and that are usually close one to another.
For example, the European Patent EP-A-1249665 in the name of WHIRPOOL teaches to implement a similar burner in which the flame spreader, being dome shaped, has a plurality of slits with a substantially horizontal outlet section composing the flame holes of the aforesaid burner.
Such a burner type for cooking hobs, usually fed through a mixer for example of the Venturi type, which feeds a mixture of fuel gas/primary air to a distribution chamber obtained in the burner body and fluidically connected to the aforesaid flame spreader, usually has the drawback that, because of the arrangement of the flames and their nearness one to another in such a burner, the inflow of secondary air to the flames, which is necessary to have the correct stoichiometric relation between the fuel gas and oxygen for the combustion, is usually not sufficient, so that the mixture combustion is not complete or sufficient and could sometime produce unacceptable amounts of noxious substances.
In particular, the inflow of secondary air at the holes of the flame/s, which are placed in the interior on the flame spreader, is usually impeded, or impaired, by the flames emanating to the outside on the same flame spreader.
In order to solve such a drawback it is known art to provide this type of burner with an opening for feeding secondary air placed on the flame spreader in the center of the flame holes, so that the latter are fed not only by the secondary air of the atmosphere surrounding the flame spreader, but also by the secondary air coming from the burner center.
For example, the Patent Application EP-A-2072901 in the name of CANDY describes a cooking hob provided with "flat" burners which have, in a central position with respect to the flame spreaders, an opening for feeding secondary air supplied through a forced ventilation system. In this way, the flow of secondary air, being just a forced flow, can be accurately adjusted so that the combustion of fuel mixture in the aforesaid burners will be substantially optimal. On the other hand, such a result is obtained with a great increase of the complexity of the cooking hob and then of the final cost of such a component. Furthermore, the use of an equipment for producing a flow of forced air obviously decreases the overall reliability of the cooking hob.
The Australian Patent AU-B-312372 in the name of MALLEYS Ltd. describes a burner provided with flame holes which have substantially horizontal outflow section, the burner having, at the upper lid of the burner, in the center of the flame holes, an opening for feeding the secondary air. Such an opening is connected, through a ductwork extending inside the burner body and the respective cup, to a zone beneath the burner cup, and then beneath the cooking hob, from which therefore the secondary air flows.
However such a solution, although less complex than the solution of the Patent EP- A-2072901, proved to be sometimes ineffective, because the draw of secondary air from the area beneath the cooking hob can not be constant and sufficient, as in such an usually closed space depressions and turbulences can be produced, for example given by the oven or the opening/closing of drawers or doors placed under the cooking hob, not allowing a regular inflow of secondary air to the burner.
It is therefore an object of the present invention to realize a burner of the afore referred type not presenting the drawbacks of the known art before complained.
It is then an object of the present invention to provide a burner provided with a flame spreader with flame holes having respective sections for the outflow of the fuel mixture that are tilted of an angle comprised between 0° and 30° with respect to the horizontal line, in which the inflow of secondary air to the flame holes is sufficient to have an efficient combustion of such a fuel mixture.
A further object of the present invention is to provide a burner of the afore referred type having an effective combustion of the fuel mixture feeding it, without the need to be coupled to complex devices of forced ventilation for its operation.
SUMMARY OF THE INVENTION
These and other objects are obtained by the gas burner for cooking hobs according to the present invention, as claimed in the first independent claim and the following dependent claims. The gas burner according to the present invention comprises a burner cup provided with at least one ejection nozzle of the fuel gas, which is integral with a cooking hob or provided with means for the connection to the latter; at least one mixer of the fuel gas with primary air placed downstream of the ejector nozzle and fed with fuel gas through such a nozzle; a burner body removably coupled to the cup of the burner and comprising at least one distribution chamber for the mixture composed of fuel gas/primary air placed downstream of the mixer; and at least one flame spreader, coupled to the aforesaid distribution chamber, which is provided with flame holes having respective outflow sections lying substantially on one or more planes inclined of an angle comprised in the range 0° - 30°, that is an angle greater or equal to 0° and lower or equal to 30°, with respect to the horizontal line, and in which such a flame spreader has a preferably annular shape, and has a central opening for the outflow of the secondary air.
Advantageously, the burner body comprises at least part of the structure of at least one inflow ductwork for the flow of the secondary air towards said central opening for the outflow of the secondary air, and such an inflow ductwork of secondary air has its own drawing section to draw secondary air which opens over the cooking hob. As the Applicant has verified, the draw of secondary air from above the cooking hob, preferably in a zone sufficiently distant from the flame holes, far from being ineffective, allows a sufficient intake of secondary air to the flames of the afore described "flat" burner and then an effective combustion of the fuel mixture.
According to a preferred aspect of the present invention, the drawing section of the inflow ductwork of secondary air opens at a distance from the central opening for the outflow of secondary air and from the flame holes of the flame spreader and in particular, preferably, it opens at a distance greater than 10 mm from the closest flame hole.
Such a peculiar solution allows to obtain an optimal inflow of secondary air towards the central outflow opening, because of the sufficient distance from flames and then from heating phenomena and turbulences of surrounding air.
According to another preferred aspect of the present invention, the burner comprises at least one inflow ductwork for the primary air, fluidically connected to the aforesaid mixer, having the drawing section to draw primary air indifferently placed over or beneath the cooking hob.
It has to be noticed that with "drawing section" is meant the area of that opening directly belonging, or anyway fluidically connected, to the respective ductwork, which allows the income of primary or secondary air into the same ductwork. Such a drawing section, as will be also evident from the following description, will be completely or only partially obtained in the body or cup of the burner, or it will be obtained in the cooking hob or made in a body coupled to the burner, as long as fluidically connected to the respective inflow ductwork.
According to a further preferred aspect of the present invention, the aforesaid mixer can be a mixer with Venturi effect with radial expansion or a mixer with Venturi effect with axial expansion.
BRIEF DESCRIPTION OF THE FIGURES
For purposes of exemplifying the present invention and without limitative purposes thereof, some embodiments of the present invention will be provided with reference to the accompanying drawings, in which:
- figure 1 shows a gas burner for cooking hobs according to a particular embodiment of the present invention seen in a top plan view;
- figure 2 is a side section view according to the line A-A of figure 1 of the gas burner of the preceding figure;
- figure 3 is a side section view according to the line B-B of the gas burner represented in figures 1 and 2;
- figure 4 is a perspective view of a gas burner for cooking hobs according to a different embodiment of the present invention;
- figure 5 is a side section view of the gas burner shown in figure 4.
DETAILED DESCRIPTION OF SOME EMBODIMENTS OF THE PRESENT INVENTION
Referring at first to the gas burner 1 for cooking hobs 2 depicted in figures 1-3, according to a preferred aspect of the present invention, it comprises a cup 3 constrained and/or integral to the cooking hob 2, and extended beneath the latter, and having an ejection nozzle 4 for the fuel gas, a body 6.1, 6.2 of the burner, removably assembled on top of the cup 2 and provided with a mixer 7 of primary air I - fuel gas, fluidically placed downstream of the nozzle 4, and at least part of a distribution chamber 8 of the fuel mixture, fluidically placed downstream of the mixer 7, as well as a flame spreader 9 provided with a plurality of flame holes 18, and preferably having a substantially annular shape, placed over the body 6.1, 6.2 of the burner so that to be fluidically coupled to the distribution chamber 8.
It has to be observed that herein and in the following with the term "cup" of the burner, as the person skilled in the art knows, it is generically meant the burner component intended to be fixed to the cooking hob and arranged to support at least one ejection nozzle of the fuel gas connected to the gas distribution system.
With the term "mixer" is meant that component, sometimes associated at least in part with the cup and/or with the body of the burner, and interposed between, or belonging to, such components, that is able to mix the fuel gas coming from the aforesaid nozzle and a flow of primary air coming from the outside of the burner. Such a mixer can be, and preferably is, a Venturi tube of the type with radial expansion or with axial expansion.
Herein with the term "burner body" is meant such a component, e.g. coupled by juxtaposing complementary parts to the top of the cup, defining at least a distribution chamber of the mixture, fluidically connected to the outlet section of the aforesaid mixer, arranged to be coupled to a flame spreader.
Finally, with the term "flame spreader" is meant that component of the burner, usually constrained to the top of the burner body and fluidically connected to the aforesaid distribution chamber, having a plurality of flame holes, i.e. holes intended to allow the fuel mixture to be delivered outwards (i.e. the mixture of fuel gas/primary air formed in the mixer), so that the combustion of such a mixture would become possible with the intake of an appropriate volume of secondary air.
Herein and in the following it has to be noticed as well that such burner components, that is the "cup", the "burner body", the "mixer" and the "flame spreader", are not necessarily composed exclusively by monolithic bodies, but they can be composed as well by several parts stably assembled or coupled one to another. In particular, the mixer could be indifferently obtained in the cup and/or the burner body, or else it could be a distinct body, simply coupled to such a cup and/or burner body.
Coming back to the herein illustrated burner 1, the cup 3 of the burner is provided with means for connecting to the cooking hob 2, herein not shown, but quite ordinary in burners known in the art, and for example composed of flat springs, and/or threads or bolts and/or embedments through complementary parts, and it is shaped so as to allow the coupling of the body 6.1 , 6.2 of the burner in an upper position.
Such a cup 3 of the burner, composed of an usually metallic hollow body, comprises as well an ejection nozzle 4 of the fuel gas connected, or connectable, to the domestic gas distribution system, which is arranged inside the hollow zone 5 of the cup 3 so as to have the gas ejection axis directed towards the inlet section of the mixer 7 to mix the primary air I with the fuel gas, as will become evident in the following.
The burner body comprises a first lower component 6.1, on which at least part of a mixer 7 is obtained for mixing primary air I with fuel gas, and a second upper component 6.2 mechanically connected to the upper component, and carrying at least part of a distribution chamber 8 of the mixture of fuel gas/primary air, the chamber being placed downstream of the mixer 7 and fluidically communicating with the latter.
According to a particular aspect of the present invention, the mixer 7 is a Venturi effect mixer with radial expansion - also known as "radial Venturi" - comprising, as known in the art, a vertical axis duct tapered upwardly and opening over an expansion chamber with a horizontal development, that is composed of two opposed walls closed one to another, so that the main dimensions of such a chamber lie on a substantially horizontal plane. It has to be observed that, in the particular embodiment of the radial Venturi 7 herein illustrated, the tapered duct with vertical axis, together with the lower walls of the expansion chamber, is obtained in the first lower component 6.1 of the burner body, whereas the upper walls of the expansion chamber are obtained in the second upper component 6.2 of said burner body.
As the person skilled in the art can easily deduce, such an arrangement can be easily changed, for example by implementing the radial Venturi separately from the burner body or integrally with the latter, without in this case departing from the herein requested scope of protection. As can be seen in particular in the enclosed figures 2 and 3, the inlet section of the tapered vertical duct of the radial Venturi 7 opens into a hollow zone 5 defined by the cup 3 so that such an ejection nozzle 4 directs its own flow of fuel gas into such a vertical tapered duct and so that the primary air I reaching the cup 3 is withdrawn, precisely thanks to the Venturi effect, into such a vertical tapered duct.
In particular, referring to figure 2, the first lower component 6.1 of the burner body is shaped to realize, when coupled to the cup 3 and the cooking hob 2, i.e. to the upper wall of the latter, some ductworks 12.1, 12.2 having respectively a drawing section 13.1, 13.2 of the primary air I placed over the cooking hob 2 and a development, defined by the lower walls of the first component 6.1 of the burner body and by upper walls of the cooking hob 2, that leads the primary air I, withdrawn by the radial Venturi 7, into the concave zone 5 of the cup 3.
The drawing sections 13.1, 13.2 of the primary air I are preferably placed at a certain distance from the flame spreader 9 and, in particular, from the respective flame holes 18.
It has to be observed that, as it will be evident, the presence of such ductworks for the primary air with the drawing section positioned over the cooking hob could be alternatively substituted by the presence of ductworks for the primary air positioned beneath the cooking hob, and fiuidically connected to the burner cup and/or the inlet section of the mixer, without in this case departing from the scope of protection herein required by the present invention.
The expansion chamber of the radial Venturi 7, placed downstream of the more restricted section of the vertical tapered duct of the radial Venturi, is placed in fiuidic communication, as mentioned, with a distribution chamber 8 of the fuel mixture, having an annular shape and obtained, at least in part, in the second lower component 6.2 of the burner body.
Such a distribution chamber 8, whose lower wall is defined by the flame spreader 9, feeds the fuel mixture to the flame holes 18 of the same flame spreader 9, the holes having an outflow section lying substantially on one or more planes inclined with respect to the horizontal line of an angle greater or equal to 0° and lower or equal to 30°, so that the flame spreader 9 takes a substantially horizontal or spherical-cap (dome) shape with wide curvature radius.
The flame spreader 9, in this particular burner 1 having a substantially annular shape and comprising, as mentioned, a plurality of flame holes 18 composed of through openings which are preferably disposed annularly too and around the center of the flame spreader 9 itself, has a central opening 10, in this case circular, surmounted by a lid 11 that is shaped so as to allow the central opening 10 to communicate with the outer environment.
In other words, the flame holes 18 of the substantially flat flame spreader 9 encircle the central opening 10 intended, as mentioned, for the outflow of secondary air II into the flames giving off from the flame spreader 9.
It has to be observed that, although it is herein described a burner provided with only one flame spreader, the person skilled in the art will easily understand that the presence of several flame spreaders will not impede to implement the present invention and thus it is obviously comprised in the herein required scope of protection.
The central opening 10, intended to allow the outflow of secondary air II directed towards the flames coming out from the flame spreader 9, is fluidically connected to the ductworks 16.1, 16.2 that are obtained at least in part inside the body of the burner 6.1, 6.2 and respectively have drawing sections 17.1, 17.2 for the secondary air II placed over the cooking hob 2, so as to allow the inflow of secondary air II drawn from these sections 17.1, 17.2 to the central opening 10.
According to a preferred aspect of the present invention, conveniently and preferably the drawing sections 17.1, 17.2 of the ductworks 16.1, 16.2 for the secondary air II are placed at a distance from the central opening 10 for the outflow of secondary air II and/or from the flame holes 18 of the flame spreader 9, so as to decrease the influence of flames and the respective heat emitted therefrom on the drawn flow of secondary air II.
More preferably, such drawing sections 17.1, 17.2 to draw the secondary air II are arranged at a distance greater than 10 mm from the closest flame hole and, in case wherein the burner 1 comprises also a supporting grid 14, 15 for cooking vessels, the drawing sections 17.1, 17.2 of the ductworks 16.1, 16.2 for the secondary air II can be arranged at or beyond such a supporting grid 14 with respect to the flame spreader 9.
It has to be observed that, in case wherein the flame holes 18 of the flame spreader 9 are arranged substantially along concentric circumferences on the substantially horizontal or curved (with wide curvature radius) surface of the same flame spreader 9, then the drawing sections 17.1, 17.2 to draw the secondary air II are preferably arranged at a distance greater than 10 mm from the circumference of the flame holes 18 that is farthest from the central opening 10 for the outflow of the secondary air II. The ductworks 16.1, 16.2 for the secondary air II, similarly to those 12.1, 12.2 for the primary air, have a structure made at least in part in the body of the burner 6.1, 6.2 and at least in part have a structure comprising as well at least one zone defined at least in part by the cooking hob 2, in particular in the herein represented burner 1. In particular, in the embodiment of the herein illustrated burner 1, the ductworks 16.1, 16.2 for the secondary air II are respectively composed by ductwork lengths obtained in the burner body, thanks to the mutual assembly of the aforesaid first and second component 6.1, 6.2, and by ductwork lengths defined at least on bottom by walls of the cooking hob 2 and, on top, by lower walls of a supporting grid 14, 15 for cooking vessels, such as pots or pans.
It has to be noticed that, although it is herein described a burner provided with a plurality of ductworks for the secondary air, every burner provided with even only one ductwork for the secondary air falls within the scope of protection herein requested for the present invention, as burners provided with ductworks completely made in the burner body still fall in such a scope of protection, on the condition that they have respective drawing sections placed over the cooking hob.
It has to be also observed that, in a not illustrated embodiment of burner 1 object of this Patent right, in case wherein the ductworks for the primary air are made over the cooking hob 2, then the drawing sections of the ductworks for the primary air can coincide with the drawing sections of the ductworks for the secondary air and then these ductworks can diverge one from another, the first being directed to the mixer 7, the second being directed to the central opening 10 of the burner 1, downstream of these drawing sections. In other words, the burner 1 according to the present invention may comprise ductworks that, starting from one or more drawing sections to draw atmospheric air which are placed over the cooking hob 2, and commonly to such ductworks, have a branch whereby a part of these ductworks is shaped to direct the (primary) air towards the mixer 7 and another part of these ductworks is shaped to direct the (secondary) air towards the central opening 10 of the burner.
As mentioned, the herein described burner 1 comprises, according to a particular aspect of the present invention, a supporting grid 14, 15 for cooking vessels, composed of a substantially annular base 14 having resting arms 15 adapted to bear the cooking vessels. The base 14, disposed around the flame spreader 9 and then also around the body of the burner 6.1, 6.2, is removably engaged, thanks to the mutual engagement of complementary parts, with the cooking hob 2 and defines with the latter, thanks to its own lower wall, at least one length of the ductworks 16.1, 1 .2 for the inflow of secondary air II, in addition to define the respective drawing sections 17.1 , 17.2 of the secondary air II.
Alternatively, in an embodiment of the present invention herein not shown, the drawing sections 17.1, 17.2 of the ductworks 16.1, 16.2 for the secondary air II and, furthermore or alternatively, the drawing sections 13.1, 13.2 of the ductworks 12.1, 12.2 for the primary air I, can be obtained in the same supporting grid 14, 15, and in particular in the base 14 of such a supporting grid.
The burner 1 is further completed, as known in the art, by at least one ignition spark plug and a safety device, for example comprising a thermocouple, in order to avoid gas leakage in case of accidental flame blowing out, herein not represented.
The operation of the above described burner 1 is the following.
During the ignition, the flow of fuel gas leaving the ejection nozzle 4 and directed into the mixer 7, of the type named "radial Venturi", just because of the Venturi effect causes the withdrawn of primary air I coming from the drawing sections 13.1, 13.2 placed over the cooking hob 2, and its passage through the ductworks 12.1 and 12.2, through the cup 5 and from here into the same radial Venturi 7, where such a primary air I undergoes a mixing with the aforesaid fuel gas.
Then the mixture made by the mixer 7 flows into the distribution chamber 8 obtained in the burner body 6.1, 6.2, and from here it reaches the flame holes 18 of the flame spreader 9. At the outlet of the flame holes 18 the presence of a firing, for example composed of a spark generated by an ignition spark plug, allows the combustion of the fuel mixture, also due to the presence of atmospheric air constituting the secondary air II for the fuel mixture.
It has to be noticed that, because of the substantially horizontal arrangement of the outflow sections of the flame holes 18 of the flame spreader 9 and their annular and closed arrangement, the flames depart from substantially vertical axes from such flame holes 18 and interfere one to another, because of their nearness.
During the combustion, the inflow of secondary air towards the flames developing at the outflow sections of the flame holes 18 is assured by both the atmosphere surrounding the burner and the flow of secondary air II that, withdrawn by the less density of the atmospheric air at the center of the burner 1, caused by the flame heat, is passed from the aforesaid drawing sections 17.1, 17.2, placed over the cooking hob 2, of the respective inflow ductworks 16.1, 16.2 to the central opening 10 for the outflow of the same secondary air II.
In practice the Applicant has noticed that such a solution, in which the natural inflow of secondary air II is provided by means of convective motions towards the burner center from an area placed over the cooking hob 2, assures an effective combustion of the fuel mixture in such a burner 1.
In Figures 4 and 5 an alternative embodiment of the present invention is illustrated, in which a gas burner 101 is visible and comprises, similarly to the burner 1 of figures 1 to 3, a cup 103 integral with, or provided with connecting means to, a cooking hob 102 and comprising an ejection nozzle 104 of fuel gas, a mixer 107 of the fuel gas with primary air I, placed downstream of the nozzle 104 and obtained at least in part in the cup 103, a burner body 106, removably coupled to the cup 103, of the burner 101 and comprising at least part of a distribution chamber 108 of the mixture composed of fuel gas/primary air I, placed downstream of the mixer 107, as well as a flame spreader 109 coupled to the distribution chamber 108 and provided with flame holes 118 having respective outflow sections which substantially lie on one or more plane inclined with respect to the horizontal line of an angle between 0° and 30°.
The flame spreader 109 of the burner 101, identically to the flame spreader 9 of the burner 1, comprises, in a central position, encircled by the flame holes 118, a central opening 110 designed for the outflow of secondary air II directed towards the flames of the same flame spreader 109, and surmounted by a lid 111, the latter being placed at a distance from the opening 110 itself in order to allow the flow of secondary air II.
The burner 101 comprises as well a ductwork 116, obtained at least in part in the body 106 of the burner, for the inflow of secondary air II that has its own drawing section 117 to draw the secondary air II placed over the cooking hob 2 and connects such a drawing section 117 to the central opening 110 of the flame spreader 109. More in detail the ductwork 116 for the secondary air II comprises a first length obtained by coupling the body of the burner 106 with the cup 103, that is by coupling the wall belonging to such components of the burner 101, and a second length defined at least in part by the cooking hob 102, and specifically also by walls of a supporting grid 114, 115 for the cooking vessels. The respective drawing section 117 to draw secondary air II is realized over the cooking hob 102, between the grid 114, 115 and the upper surface of the cooking hob 2.
The body of the burner 106 also comprises, in addition to part of the ductwork 116 for the secondary air II, part of the structure of a ductwork 112 for the primary air I, provided with a drawing section 113 to draw the same primary air I placed over the cooking hob 102 and shaped so as to allow the inflow of primary air I into a well 105 placed immediately downstream of the ejection nozzle 104 of fuel gas, defined by the cup 103.
The ductwork 112 for the primary air I, similarly to the ductwork 116 for the secondary air II, is defined in part by the coupling of the body of the burner 106 with the cup 103 and in party by the coupling of the aforesaid supporting grid 114, 115 for cooking vessels with the upper surface of the cooking hob 102.
It has to be observed that, as mentioned above, the possible arrangement of the drawing section 113 to draw primary air I beneath the cooking hob 102 - herein not shown - falls anyway in the requested scope of protection of the invention. In any case, the primary air I coming from the ductwork 116 meets the aforesaid well 105 and, downstream of the latter, the mixer 107 composed, in the herein described burner 101, of a Venturi tube with axial expansion - herein named also as axial Venturi - horizontally arranged in the cup 103 and adapted to axially receive the flow of fuel gas emitted from the ejection nozzle 104.
Such an axial Venturi 107, as well known in the art, is composed of a restricted inlet section, placed downstream of the well 105, and an expansion section, composed of a truncated cone duct, whose section gradually widens in the axial direction from the aforesaid restricted inlet section.
When there is the presence of a gas flow inside such a mixer 107, the establishment of a Venturi effect, withdrawing the primary air I into the mixer 107 of the axial Venturi type itself, causes also an optimal mixing of the primary air I with the fuel gas at the end of the expansion section.
A passage is provided at the outlet of the expansion section of the axial Venturi 107, inside which the just formed fuel mixture passes, the passage being directed to the aforesaid substantially annular distribution chamber 108 defined in part by the body of the burner 106 and in part by the same flame spreader 109, the latter limiting the chamber 108 on top.
The flame spreader 109 has, as mentioned, a plurality of flame holes 118 having a substantially elliptical shape, communicating with the distribution chamber 118 and disposed around the central opening 110 for the outflow of secondary air II.
Lastly, similarly to the afore described burner 1, also the burner 110 comprises a supporting grid 114, 115 composed of a base 114, shaped to couple with the body of the burner 106 and/or with the cooking hob 2 so that to encircle the flame spreader 9, and of a plurality of resting arms 115 to support a cooking vessel, such a skillet, a pan or similar. In the particular embodiment of the herein illustrated invention, the base 114 of such a supporting grid, as afore described, defines partially the ductworks 112, 116 for the inflow of primary air I and secondary air II in cooperation with some upper parts of the cooking hob 102.
At least one ignition spark plug and one safety device, for example of the type comprising a thermocouple, herein not represented, complete the burner 101. The operation of the burner 101 is completely similar to the operation of the burner 1 and to the latter reference is made.
In fact, the use of a different mixer 107 does not modify the operation tenet of the burner 101 with respect to the afore shown burner 1, as the presence of a different number of ductworks for the primary air I and secondary air II does not modify it. In any case, as mentioned, in such a burner type the Applicant noticed that the presence of means for allowing the natural inflow of secondary air from the above of the cooking hob towards the center of the flat burner, of the afore defined type, i.e. without the use of devices for causing a forced flow of secondary air or without drawing secondary air from the beneath of the cooking hob, revealed to be able to allow an efficient combustion.

Claims

1. Gas burner ( 1 ; 101 ) of the type comprising:
a. a burner cup (3; 103) provided with at least one ejection nozzle (4; 104) of the fuel gas, integral with a cooking hob (2; 102) and/or provided with means for the connection to said cooking hob (2; 102);
b. at least one mixer (7; 107) of the fuel gas with primary air (I) placed downstream of said at least one ejector nozzle (4; 104) and fed with fuel gas from said at least one nozzle (4; 104);
c. a burner body (6.1, 6.2; 106) removably coupled to the cup (3; 103) of the burner and comprising at least part of a distribution chamber (8; 108) of the mixture composed of fuel gas/primary air (I) placed downstream of said at least one mixer (7; 107); and
d. at least one flame spreader (9; 109) coupled to said at least one distribution chamber (8; 108) and provided with flame holes (18; 118) having respective outflow sections of the mixture composed of fuel gas/primary air which substantially lie on one or more planes inclined of an angle comprised in the range 0° - 30° with respect to the horizontal line, said at least one flame spreader (9; 109) having a central opening (10; 110) for the outflow of the secondary air (II);
characterized in that said burner body (6.1, 6.2; 106) comprises at least part of the structure of at least one inflow ductwork (16.1, 16.2; 116) of secondary air (II) towards said central opening (10; 110) for the outflow of the secondary air (II); said at least one inflow ductwork (16.1, 16.2; 116) of secondary air (II) having a drawing section (17.1, 17.2; 117) to draw secondary air (II) which opens over said cooking hob (2; 102).
2. Gas burner according to claim 1, characterized by comprising at least one inflow ductwork (12.1, 12.2; 112) of primary air (I) fluidically connected to said at least one mixer (7; 107), said at least one inflow ductwork (12.1, 12.2; 112) of primary air having its own drawing section (13.1, 13.2; 113) to draw primary air (I) placed over the cooking hob (2; 102).
3. Gas burner according to claim 1, characterized by comprising at least one inflow ductwork (12.1, 12.2; 112) of primary air (I) fluidically connected to said at least one mixer (7; 107), said at least one inflow ductwork (12.1, 12.2; 112) of primary air (I) having its own drawing section to draw primary air (I) placed beneath the cooking hob (2; 102).
4. Gas burner according to any one of the preceding claims, characterized in that at least part of the structure of said at least one outflow ductwork (16.1, 16.2; 116) of secondary air (II) comprises at least one zone at least partially defined by said cooking hob (2; 102).
5. Gas burner according to any one of the preceding claims, characterized in that at least part of said drawing section (17.1, 17.2; 117) of said at least one inflow ductwork (16.1, 16.2; 116) of the secondary air (II) opens at a distance from said central opening (10; 110) for the outflow of secondary air (II) and/or from flame holes (18; 118) of said flame spreader (9; 109).
6. Gas burner according to claim 5, characterized in that said at least one inflow ductwork (16.1, 16.2; 116) of the secondary air (II) has its own drawing section (17.1, 17.2; 117) at a distance greater than 10 mm from the closest flame hole (18; 118).
7. Gas burner according to any one of the preceding claims, characterized in that said at least one mixer (7; 107) comprises a Venturi tube with radial expansion which is made at least in part in said burner body (6.1 , 6.2; 116).
8. Gas burner according to any one of the claims 1 to 6, characterized in that said at least one mixer (7; 107) is a Venturi tube with axial expansion made at least in part in said burner cup (3; 103).
9. Gas burner according to any one of the preceding claims, comprising at least one supporting grid (14, 15; 114; 115) for a cooking vessel, characterized in that said drawing section (17.1, 17.2; 117) of said at least one inflow ductwork (16.1, 16.2; 116) of the secondary air (II) opens at and/or inside said supporting grid (14, 15; 114; 115).
EP13745165.4A 2013-04-17 2013-04-17 Gas burner for cooking hobs Active EP2986913B1 (en)

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PCT/IB2013/000709 WO2014170707A1 (en) 2013-04-17 2013-04-17 Gas burner for cooking hobs

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EP2986913A1 true EP2986913A1 (en) 2016-02-24
EP2986913B1 EP2986913B1 (en) 2019-02-27

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CN112781045A (en) * 2021-01-18 2021-05-11 汉道(江苏)新能源科技有限公司 Normal-temperature air high-temperature combustion device

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CN113330253A (en) * 2019-01-21 2021-08-31 Bsh家用电器有限公司 Pot support for a gas cooker, gas cooker and method for producing a pot support

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ES2726542T3 (en) 2019-10-07
WO2014170707A1 (en) 2014-10-23
EP2986913B1 (en) 2019-02-27
PL2986913T3 (en) 2019-07-31

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