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
  • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
  • F23D14/26—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid with provision for a retention flame
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
  • F23D14/46—Details, e.g. noise reduction means
  • F23D14/48—Nozzles
  • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
  • F24C3/00—Stoves or ranges for gaseous fuels
  • F24C3/08—Arrangement or mounting of burners
  • F24C3/085—Arrangement or mounting of burners on ranges
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
  • F24C3/00—Stoves or ranges for gaseous fuels
  • F24C3/10—Arrangement or mounting of ignition devices
  • F24C3/103—Arrangement or mounting of ignition devices of electric ignition devices

Definitions

• the present invention relates to a gas burner, in particular for a cooking appliance, according to the preamble of claim 1.
• the present invention also relates to a cooking appliance comprising said gas burner.
• Such gas burners usually comprise a cup associated with supply means that supply gas to said burner.
• Said supply means may comprise a Venturi effect chamber adapted to receive gas coming from an injector associated with a duct; in particular, the injector and/ or the duct and/ or the Venturi effect chamber may be either vertical, i.e. with their axis parallel to an axis of the burner cup, or horizontal, i.e. with their axis orthogonal to the axis of the burner cup.
• gas burners which are currently installed in household cooking appliances typically comprise:
• said body and flame divider and/ or cap are positioned on the cooking top and use the air above the cooking top as primary air to be mixed with the gas.
• the body is usually made of die-cast aluminium, while the flame divider is usually made of enamelled cast iron (or brass alloy or steel) and acts as a body closing element.
• Known burners typically propagate a flame known as “crown flame”; a “crown flame” is a flame with a substantially radial direction of propagation, i.e. it propagates outwards from the gas burner in a substantially radial direction with respect to the burner axis, and therefore in a direction which is substantially tangential to a visible surface of the cooking top.
• Said “crown flame” when emitted at an insufficient height above the cooking top, may cause I0W-O2 combustion, resulting in the generation of a high level of unburnt products (CO and NOx); in addition, due to the thermal content of the flame, it may lead to deformation and/ or blackening of the portion of the cooking top around the burner.
• document EPl 934532 ensures all the advantages that distinguish a carpet flame from a crown flame, including optimal gas efficiency.
• a carpet flame may be a total carpet flame or a perimetric carpet flame, depending on whether it covers a geometric figure (generally a circle) entirely or it covers just the peripheral portion of said geometric figure (generally a circular crown).
• the flame emitted from the outermost apertures of the flame divider or cap adapted to generate a "carpet flame” creates a sort of barrier against secondary air, which, as a consequence, will not properly reach those apertures which are closer to the centre of the flame divider or cap.
• a further drawback is that known burners typically have components which are difficult to clean by a user, since their geometry is excessively complex.
• FIG. 1 is a perspective view of a gas burner, in particular for a cooking appliance, according to the present invention
• Fig. 2 is a top view of the gas burner of Fig. 1;
• Fig. 3 is a perspective view of a possible variant of the gas burner of Fig. 1;
• Fig. 4 is a top view of the variant of Fig. 3;
• FIG. 5 is a sectional side view of the gas burner of Fig. 1;
• Fig. 6 is a sectional side view of the gas burner according to the present invention.
• Fig. 7 is a sectional side view of a detail of the burner of Fig. 6;
• Fig. 8 is an exploded perspective view of another embodiment of the burner according to the present invention.
• Fig. 9 is an exploded perspective view of a further embodiment of the burner according to the present invention.
• Fig. 10 is a sectional side view of the burner of Fig. 8.
• reference numeral 1 designates as a whole a gas burner, in particular for a cooking appliance, according to the present invention.
• Said burner 1 comprises a cup 10 associated with supply means 11, 12 for supplying gas to said burner 1.
• said supply means comprise an injector 11 delivering gas coming from a duct 12.
• the duct 12 is positioned substantially horizontally, i.e. with its axis substantially orthogonal to an axis A-A (visible in Figs. 1 and 2) of the burner 1; however, it may also be positioned vertically, i.e. with its axis parallel to the axis A-A.
• the duct 12 is shown as realized in one piece with said cup 10; it is however clear that said duct 12 may also be provided as a body distinct from the cup 10, and then be associated therewith through known fastening means (not shown in the annexed drawings).
• the burner 1 comprises a cup 10 and a burner body 20 (shown, for example, in Figs. 5, 6, 8, 9 and 10), associated with said cup 10.
• the duct 12 and the injector 11 may be positioned substantially horizontally, i.e. with their axis substantially orthogonal to the axis of the burner 1, or they may also be positioned vertically, i.e. with their axis parallel to an axis A-A (visible in Fig. 1) of the burner 1.
• the burner 1 further comprises a flame divider 30 associated with said burner body 20 and comprising a plurality of first apertures 31 to allow the gas to escape, which are so realized as to generate a "carpet flame", i.e. a flame (not shown in the drawings) that propagates outwards from the burner 1 in a substantially axial direction with respect to the axis A-A of the burner 1.
• a "carpet flame” i.e. a flame (not shown in the drawings) that propagates outwards from the burner 1 in a substantially axial direction with respect to the axis A-A of the burner 1.
• said first apertures 31 are so realized as to extend substantially parallel to the axis A-A of the burner 1.
• said first apertures 31 are so realized as to have an elongated shape when viewed from above (i.e. when viewed in a substantially axial direction with respect to the axis A-A of the burner 1).
• said first apertures 31 are so realized as to have a substantially elliptic shape; it is however apparent that the elongated shape of said first apertures 31 may be different, e.g. substantially rectangular.
• the particular shape of said first apertures 31 turns out to be especially advantageous because they can be made easily and comfortably and because they can ensure optimal gas combustion.
• the particular shape of the first apertures 31 allows to avoid the formation of a sort of barrier against secondary air, which can thus reach even the innermost portions of the flame divider 30, particularly in the presence of a food cooking container (not shown) placed over the burner 1, which otherwise might contribute to hindering the flow of secondary air.
• the flame divider 30 of the burner 1 is preferably so realized as to have a substantially circular shape when viewed from above.
• each first aperture 31 comprises a first portion 31a, a second portion 31b and an intermediate portion 31c, said second portion 31b being closer to a central area 30C of the flame divider 30 than said first portion 31a.
• each first aperture 31 is oriented in a substantially radial manner on said flame divider 30.
• each first aperture 31 is inclined relative to a radius R (in Fig. 2 a couple of radii R are indicated by dashed lines) of said flame divider 30; this means that said first portion 31a and second portion 31b of each first aperture 31 lie each on a different radius R.
• each first aperture 31 is not much inclined relative to the radius R, preferably not so much as to make a second axis A2 of each first aperture 31 perpendicular to the radius R.
• said first apertures 31 are shown to be inclined in the same direction at substantially the same angle relative to said radius R; it is however clear that the inclination of each aperture 31 may also be different.
• the burner 1 according to the present invention advantageously also comprises a plurality of second apertures 32, which are smaller than the first apertures 31 and offset therefrom.
• each second aperture 32 is positioned between a pair of said first apertures 31; in addition, said second apertures 32 have a substantially circular shape when viewed from above.
• each second aperture 32 is positioned in the proximity of:
• the flame divider 30 comprises profiled portions 33 adapted to allow room for at least one ignition spark plug 60 and/ or at least one thermocouple 70; in particular, as can be seen in Fig. 1, said at least one ignition spark plug 60 and at least one thermocouple 70 are associated with the cup 10 of the burner 1, e.g. through a bracket 13 preferably made as one piece with the cup 10 (Fig. 1 only shows the bracket 13 that allows the ignition spark plug 60 to be associated with the cup 10 of the burner 1).
• ducts 34 are obtained which are adapted to allow the flow of a limited quantity of gas for flame ignition and/ or detection purposes. Said ducts 34 first allow the flame to propagate from the ignition spark plug 60 towards the first apertures 31 and the second apertures 32, and then they allow the flame to reach the thermocouple 70 from the first apertures 31 and the second apertures 32.
• the burner 1 also comprises a burner body 20 associated with said cup 10 and comprising a Venturi effect chamber 21, in particular said chamber 21 being positioned substantially coaxial to said injector 11.
• said Venturi effect chamber 21 extends substantially vertically in a central position inside the burner body 20; it is clear that the Venturi effect chamber 21 may also extend in a substantially horizontal direction or be positioned otherwise inside the burner body 20.
• the burner 1 is so shaped as to allow primary air taken from above the cooking top PC to be fed to the Venturi effect chamber 21.
• the cooking top PC and the burner body 20 are mutually so arranged as to create passages that put the volume above the cooking top PC and around the burner 1 in communication with the inside of the cup 10.
• the burner 1 further comprises a flame divider 30 associated with said burner body 20 and comprising a plurality of first apertures 31 to allow the gas to escape, which are so realized as to generate a "carpet flame", i.e. a flame (not shown in the drawings) that propagates outwards from the burner 1 in a substantially axial direction with respect to the axis A-A of the burner 1, a compartment (designated as a whole by reference numeral 22) being obtained between the burner body 20 and the flame divider 30 to allow the gas to flow from the chamber 21 to said plurality of apertures 31.
• a "carpet flame” i.e. a flame (not shown in the drawings) that propagates outwards from the burner 1 in a substantially axial direction with respect to the axis A-A of the burner 1, a compartment (designated as a whole by reference numeral 22) being obtained between the burner body 20 and the flame divider 30 to allow the gas to flow from the chamber 21 to said plurality of apertures 31.
• burner body 20 and the flame divider 30 are typically realized as separate elements to be then associated with each other through methods known in the art.
• the burner body 20 and the flame divider 30 lie substantially entirely over a cooking top PC of a cooking appliance (not shown in the drawings).
• said compartment 22 comprises:
• first section 22a a substantially straight first section 22a, said first section 22a being positioned horizontally on top of the Venturi effect chamber 21; a second section 22b substantially directed downwards, in particular towards the cup 10;
• a third section 22c substantially directed upwards, in particular towards the flame divider 30.
• compartment 22 specifically refer to a sectional side view of the burner 1, in particular of the compartment 22.
• Said compartment 22 is shaped substantially like a sickle with the blade turned upwards, in particular, when viewing a side section of the compartment 22, starting from the axis A- A and extending towards the outside of the burner 1; in substance, the shape of the compartment 22 is similar to that of a question mark laid down (i.e. substantially horizontal).
• the cross-sectional area of the compartment 22 grows larger starting from the first section 22a to the second section 22b and to the third section 22c.
• the compartment 22 has a shape substantially corresponding to the shape of the top of the burner body 20 and of the underside of the flame divider 30, in that said compartment 22 is obtained in the space between the burner body 20 and the flame divider 30.
• the burner body 20 comprises a substantially U-shaped housing 23 that surrounds the upper portion of the Venturi effect chamber 21, and the flame divider 30 comprises a wall 30P that protrudes under the flame divider 30 towards said housing 23.
• a function of said housing 23 is to create an expansion chamber for the purpose of obtaining a constant and regular gas outflow.
• the Applicant has experimentally verified that the overall shape of the compartment 22 is such as to ensure optimal gas mixing and outflow speed.
• the particular shape of the compartment 22 allows to provide a burner 1 which is so realized as to allow the gas to adequately reach the first apertures 31 of the flame divider 30, said first apertures 31 being adapted to allow the gas to escape and generate a "carpet flame".
• the gas is already conveyed at the exit of the Venturi effect chamber 21 towards the first apertures 31 in a safe and accurate manner.
• said shape of the compartment 22 allows to ensure optimal efficiency from gas combustion along with lower production costs of the burner 1.
• the cup 10 and the burner body 20 may then comprise fastening means 40, 50 (visible in Fig. 5), which allow said components to be mutually coupled.
• the first apertures 31 of the flame divider 30 are so realized as to have an elongated shape when viewed from above (i.e. when viewed in a substantially axial direction with respect to the axis A-A of the burner 1).
• said first apertures 31 are so realized as to have a substantially elliptic shape; it is however apparent that the elongated shape of said first apertures 31 may be different, e.g. substantially rectangular and, preferably, with bevelled corners.
• the particular shape of said first apertures 31 turns out to be especially advantageous because they can be made easily and comfortably and because they can ensure optimal gas efficiency.
• the particular shape of the first apertures 31 allows to avoid the formation of a sort of barrier against secondary air, which can thus reach even the innermost portions of the flame divider 30, particularly in the presence of a food cooking container (not shown) placed over the burner 1, which otherwise might contribute to hindering the flow of secondary air.
• the particular shape of the first apertures implies a high- O2 combustion, resulting in the generation of only a small quantity (or even in the absence) of unburnt gases, without having to make complex and costly modifications to the realization of the burner 1.
• the flame divider 30 of the burner 1 is preferably so realized as to have a substantially circular shape when viewed from above.
• each first aperture 31 comprises a first portion 31a, a second portion 31b and an intermediate portion 31c, said second portion 31b being closer to a central area 30C of the flame divider 30 than said first portion 31a.
• each first aperture 31 is oriented in a substantially radial manner on said flame divider 30.
• each first aperture 31 is inclined relative to a radius R (in Fig. 2 a couple of radii R are indicated by dashed lines) of said flame divider 30; this means that said first portion 31a and second portion 31b of each first aperture 31 lie each on a different radius R.
• each first aperture 31 is not much inclined relative to the radius R, preferably not so much as to make a second axis A2 of each first aperture 31 perpendicular to the radius R.
• said first apertures 31 are shown to be inclined in the same direction at substantially the same angle relative to said radius R; it is however clear that the inclination of each aperture 31 may also be different.
• the burner 1 according to the present invention further comprises a plurality of second apertures 32 for flame propagation.
• each second aperture 32 is positioned between a pair of said first apertures 31; in addition, said second apertures 32 have a substantially circular shape when viewed from above.
• each second aperture 32 is positioned in the proximity of:
• the flame divider 30 comprises profiled portions 33 adapted to allow room for at least one ignition spark plug 60 and/ or at least one thermocouple 70; in particular, as can be seen in Fig. 1, said at least one ignition spark plug 60 and at least one thermocouple 70 are associated with the burner 1, e.g. through a bracket 13 (Fig. 1 only shows the bracket 13 that allows the ignition spark plug 60 to be associated with the burner 1).
• ducts 34 are obtained which are adapted to allow the flow of a limited quantity of gas for flame ignition and/ or detection purposes. Said ducts 34 first allow the flame to propagate from the ignition spark plug 60 towards the first apertures 31 and the second apertures 32, and then they allow the flame to reach the thermocouple 70 from the first apertures 31 and the second apertures 32.
• Fig. 6 is a sectional side view of the burner 1.
• the burner 1 comprises a cup 10 associated with supply means 11, 12 for supplying gas to said burner 1.
• said supply means comprise an injector 11 (e.g. like the one shown in Fig. 5) delivering gas coming from a duct 12.
• injector 11 e.g. like the one shown in Fig. 5
• the duct 12 is positioned substantially horizontally, i.e. with its axis substantially orthogonal to an axis A-A (also visible in said Fig. 6) of the burner 1; however, it may also be positioned vertically, i.e. with its axis parallel to the axis A-A.
• the duct 12 is shown as realized in one piece with said cup 10; it is however clear that said duct 12 may also be realized as a body distinct from the cup 10, and then be associated therewith through known fastening means (not shown in the annexed drawings).
• the burner 1 also comprises a burner body 20 associated with said cup 10 and comprising a Venturi effect chamber 21, in particular said chamber 21 being positioned substantially coaxial to said injector 11.
• Said Venturi effect chamber 21 extends substantially vertically in a central position inside the burner body 20; it is clear that the Venturi effect chamber 21 may also extend in a substantially horizontal direction or be positioned otherwise inside the burner body 20.
• the burner 1 further comprises a flame divider 30 associated with said burner body 20 and comprising a plurality of first apertures 31 to allow the gas to escape, which are so realized as to generate a "carpet flame", i.e. a flame (not shown in the drawings) that propagates outwards from the burner 1 in a substantially axial direction with respect to the axis A- A of the burner 1.
• a "carpet flame” i.e. a flame (not shown in the drawings) that propagates outwards from the burner 1 in a substantially axial direction with respect to the axis A- A of the burner 1.
• said first apertures 31 are so realized as to extend substantially parallel to the axis A- A of the burner 1.
• the burner body 20 and the flame divider 30 may be made either as one piece or as separate elements to be then associated with each other through methods known in the art.
• the burner 1 comprises coupling means allowing the cup 10 and the burner body 20 to be fastened to each other.
• said coupling means comprise snap fitting means 40, 50.
• said snap fitting means comprise at least one pin 40 and at least one clip 50, in particular said at least one clip 50 being made of elastic material and being adapted to receive said at least one pin 40 so as to exert a snap fitting action.
• said at least one pin 40 comprises a pair of pins 40 adapted to be associated with the burner body 20 of the burner 1
• said at least one clip 50 comprises a pair of clips 50 adapted to be associated with the cup 10.
• the snap fitting means 40, 50 may be associated otherwise with the burner 1; for example, the pins 40 may be associated with the cup 10, while the clips 50 may be associated with the burner body 20 of the burner V, likewise, it is clear that the pins 40 and the clips 50 may also be in a number of one or greater than two.
• each pin 40 comprises:
• a first end 41 adapted to be coupled to the burner body 20, in particular to a stem 24 extending from a lower portion of the burner body 20; a second end 42 adapted to be coupled to said at least one clip 50, in particular said second end 42 being round and bigger than an intermediate body 43 of the pin 40.
• each clip 50 is substantially U- shaped and comprises:
• a curved base 51 adapted to fit into a first window 14 of the cup 10;
• restriction 53 in particular obtained between said base 51 and said pair of bent ends 52, said restriction 53 being adapted to hold the first end 41 of the pin 40 in such a way as to provide a snap fitting between the pin 40 and the clip 50.
• said first window 14 is obtained in a bracket 13 associated with the cup 10, said bracket 13 being in particular made as one piece with the cup 10 or mechanically fastened thereto.
• the special provision of the snap fitting means 40, 50 according to the present invention allows to provide a gas burner 1, in particular for a cooking appliance, which is so realized as to allow the cup 10 to be coupled to the burner body 20 quickly and without difficulty, even by users without any specific technical skills.
• the snap fitting means 40, 50 according to the present invention allow to obtain a burner 1 characterized by a safe coupling between the cup 10 and the burner body 20 that avoids any malfunction of the burner 1.
• said snap fitting means 40, 50 allow to properly position the burner body 20 and, as a result, to properly associate the flame divider 30 and possibly a pan supporting grate (not shown in the drawings) with the burner body 20, thus preventing any damage to both the user of the burner 1 and to the environment around the burner 1.
• Fig. 5 one can also notice that the burner body 20 and the flame divider 30 lie substantially entirely over a cooking top PC of a cooking appliance (not shown in the drawings).
• Fig. 5 also shows that between the burner body 20 and the flame divider 30 a compartment 22 is obtained for letting the gas flow from the chamber 21 to said plurality of first apertures 31.
• Said compartment 22 comprises:
• a second section 22b substantially directed downwards, in particular towards the cup 10;
• a third section 22c substantially directed upwards, in particular towards the flame divider 30.
• compartment 22 particularly refer to a sectional side view of the burner 1 and of the compartment 22 (e.g. like the one of Fig. 5).
• Said compartment 22 is shaped substantially like a sickle with the blade turned upwards, in particular, when viewing a side section of the compartment 22, starting from the axis A- A and extending towards the outside of the burner 1; in substance, the shape of the compartment 22 is similar to that of a question mark laid down (i.e. substantially horizontal).
• the compartment 22 has a shape substantially corresponding to the shape of the top of the burner body 20 and of the underside of the flame divider 30, in that said compartment 22 is obtained in the space between the burner body 20 and the flame divider 30.
• the burner body 20 comprises a substantially U-shaped housing 23 surrounding the upper part of the Venturi effect chamber 21, and the flame divider 30 comprises a wall 30P extending under the flame divider 30 towards said housing 23.
• the particular shape of the compartment 22 allows to provide a burner 1 which is so realized as to allow the gas to adequately reach the first apertures 31 of the flame divider 30, said first apertures 31 being adapted to allow the gas to escape and generate a "carpet flame".
• the gas is already conveyed at the exit of the Venturi effect chamber 21 towards the first apertures 31 in a safe and accurate manner.
• said shape of the compartment 22 allows to ensure optimal gas efficiency along with lower production costs of the burner 1.
• the first apertures 31 of the flame divider 30 are so realized as to have an elongated shape when viewed from above (i.e. when viewed in a substantially axial direction with respect to the axis A-A of the burner 1).
• said first apertures 31 are so realized as to have a substantially elliptic shape; it is however apparent that the elongated shape of said first apertures 31 may be different, e.g. substantially rectangular, possibly with bevelled corners.
• the particular shape of said first apertures 31 turns out to be especially advantageous because they can be made easily and comfortably and because they can ensure optimal gas efficiency.
• the particular shape of the first apertures 31 allows to avoid the formation of a sort of barrier against secondary air, which can thus reach even the innermost portions of the flame divider 30, particularly in the presence of a food cooking container (not shown) placed over the burner 1, which otherwise might contribute to hindering the flow of secondary air.
• the particular shape of the first apertures implies a high- 0 2 combustion, resulting in the generation of only a small quantity (or even in the absence) of unburnt gases, without having to make complex and costly modifications to the realization of the burner 1.
• the flame divider 30 of the burner 1 is preferably so realized as to have a substantially circular shape when viewed from above.
• each first aperture 31 comprises a first portion 31a, a second portion 31b and an intermediate portion 31c, said second portion 31b being closer to a central area 30C of the flame divider 30 than said first portion 31a.
• each first aperture 31 is oriented in a substantially radial manner on said flame divider 30.
• each first aperture 31 is inclined relative to a radius R (in Fig. 2 a couple of radii R are indicated by dashed lines) of said flame divider 30; this means that said first portion 31a and second portion 31b of each first aperture 31 lie each on a different radius R.
• each first aperture 31 is not much inclined relative to the radius R, preferably not so much as to make a second axis A2 of each first aperture 31 perpendicular to the radius R.
• said first apertures 31 are shown to be inclined in the same direction at substantially the same angle relative to said radius R; it is however clear that the inclination of each aperture 31 may also be different.
• the burner 1 according to the present invention further comprises a plurality of second apertures 32 for flame propagation.
• each second aperture 32 is positioned between a pair of said first apertures 31; in addition, said second apertures 32 have a substantially circular shape when viewed from above.
• each second aperture 32 is positioned in the proximity of:
• the flame divider 30 further comprises profiled portions 33 adapted to allow room for at least one ignition spark plug 60 and/ or at least one thermocouple 70; in particular, said at least one ignition spark plug 60 and at least one thermocouple 70 are associated with the burner 1 through the brackets 13, in particular said brackets 13 comprising second windows 14B (visible in Fig. 6) adapted to receive said ignition spark plug 60 and thermocouple 70.
• ducts 34 are obtained which are adapted to allow the flow of a limited quantity of gas for flame ignition and/ or detection purposes. Said ducts 34 first allow the flame to propagate from the ignition spark plug 60 towards the first apertures 31 and the second apertures 32, and then they allow the flame to reach the thermocouple 70 from the first apertures 31 and the second apertures 32.
• Fig. 8 shows an exploded perspective view of another embodiment of the burner 1 according to the present invention.
• the burner 1 comprises a cup 10 associated with supply means 11, 12 for supplying gas to said burner 1.
• said supply means comprise an injector 11 (visible in Fig. 10) delivering gas coming from a duct 12.
• the duct 12 is positioned substantially horizontally, i.e. with its axis substantially orthogonal to an axis A-A of the burner 1; however, it may also be positioned vertically, i.e. with its axis parallel to said axis A-A.
• the duct 12 is shown as realized in one piece with said cup 10; it is however clear that said duct 12 may also be provided as a body distinct from the cup 10, and then be associated therewith through known fastening means (not shown in the annexed drawings).
• the burner 1 also comprises a burner body 20 associated with said cup 10 and comprising a Venturi effect chamber 21, in particular said chamber 21 being positioned substantially coaxial to said injector 11.
• said Venturi effect chamber 21 extends substantially vertically in a central position inside the burner body 20; it is clear that the Venturi effect chamber 21 may also extend in a substantially horizontal direction or be positioned otherwise inside the burner body 20.
• the burner 1 further comprises a flame divider 30 associated with said burner body 20 and comprising a plurality of first apertures 31 to allow the gas to escape, which are so realized as to generate a "carpet flame", i.e. a flame (not shown in the drawings) that propagates outwards from the burner 1 in a substantially axial direction with respect to the axis A- A of the burner 1.
• a "carpet flame” i.e. a flame (not shown in the drawings) that propagates outwards from the burner 1 in a substantially axial direction with respect to the axis A- A of the burner 1.
• the burner body 20 and the flame divider 30 may be made either as one piece or as separate elements to be then associated with each other through methods known in the art.
• the burner 1 comprises coupling means 40, 50; 60, 70 allowing the cup 10 and the burner body 20 to be fastened to each other.
• said coupling means comprise:
• the ignition element 60 for igniting the flame of said burner 1, wherein the ignition element 60, in particular a spark plug, comprises a first part 61 coupled to the cup 10 and a second part 62 coupled to the burner body 20, and/ or
• At least one detection element 70 for detecting the flame of said burner 1 wherein said detection element 70, in particular a thermocouple, comprises a first segment 71 coupled to the cup 10 and a second segment 72 coupled to the burner body 20.
• the burner 1 comprises an ignition element 60 and a detection element 70, in particular arranged on opposite sides with respect to the cup 10 and to the burner body 20. It is however clear that the burner 1 according to the present invention may be equipped with only one or more ignition element(s) 60 or with only one or more detection element(s) 70.
• said first part 61 and second part 62 of said at least one ignition element 60 and/ or said first segment 71 and second segment 72 of said at least one detection element 70 comprise first fitting means 61a, 62a; 71a, 72a allowing said first part 61 and second part 62 and/ or said first segment 71 and second segment 72 to be fastened together; as a result, said first fitting means 61a, 62a; 71a, 72a also allow to secure the cup 10 to the burner body 20.
• said first fitting means 61a, 62a; 71a, 72a comprise male connectors 61a; 71a adapted to be associated with respective female connectors 62a; 72a, in particular, said male connectors 61a; 71a and female connectors 62a; 72a being of the Faston type.
• the first part 61 of the ignition element 60 and/ or the first segment 71 of the detection element 70 are associated with the cup 10 of the burner 1 through at least one bracket 13, in particular said at least one bracket 13 including a second window 14B adapted to receive said first part 61 and/ or said first segment 71.
• the second part 62 of the ignition element 60 and/ or the second segment 72 of the detection element 70 are associated with the burner body 20 of the burner 1 through at least one sector 25 of the burner body 20, said sector 25 being preferably perforated in a manner such as to laterally enclose or embrace said second part 62 and/ or said second segment 72. It is clear that said at least one sector 25 is preferably obtained while manufacturing the burner body 20; however, it may also be obtained after manufacturing said burner body 20.
• each sector 25 can permanently house the second part 62 of the ignition element 60 and/ or the second segment 72 of the detection element 70, since this reduces the number of mutually separable components and hence complexity or the likeliness of any mistakes when assembling the components. It must also be underlined that the present invention is not limited to such an embodiment, since the second part 62 of the ignition element 60 and/ or the second segment 72 of the detection element 70 may be separable from each other and/ or from the burner body 20.
• the special provision of the coupling means 40, 50; 60, 70 according to the present invention allows to provide a gas burner 1, in particular for a cooking appliance, which is so realized as to include removable components, so that the cooking top can be accurately cleaned after removing said components, since the cooking top will have no protrusions which might hinder the cleaning operations.
• the special provision of the coupling means according to the present invention also allows to provide a gas burner 1, in particular for a cooking appliance, which is so realized as to allow the cup 10 to be coupled to the burner body 20 of the burner 1 quickly and without difficulty, even by users without any specific technical skills.
• the coupling means according to the present invention allow to obtain a burner 1 characterized by a safe coupling between the cup 10 and the burner body 20 of the burner 1 that avoids any malfunction of the burner 1.
• the ignition element 60 and/ or the detection element 70 will prevent the burner 1 from operating.
• said coupling means 40, 50; 60, 70 allow to properly position the burner body 20; as a result, they allow to properly associate both the flame divider 30 and a pan supporting grate (not shown in the drawings) with the burner body 20, thus preventing any damage to both the user of the burner and to the environment around the burner 1.
• the coupling means may also comprise second snap fitting means 40, 50, adapted to make the connection between the cup 10 and the burner body 20 even firmer.
• said second snap fitting means comprise at least one pin 40 and at least one clip 50, in particular said at least one clip 50 being made of elastic material and being adapted to receive said at least one pin 40 so as to exert a snap fitting action.
• said at least one pin 40 comprises a pair of pins 40 adapted to be associated with the burner body 20, and said at least one clip 50 comprises a pair of clips 50 adapted to be associated with the cup 10.
• the snap fitting means 40, 50 may be associated otherwise with the burner 1; for example, the pins 40 may be associated with the cup 10, while the clips 50 may be associated with the burner body 20 of the burner 1; likewise, it is clear that the pins 40 and the clips 50 may be in a number greater than two.
• each pin 40 comprises:
• a first end 41 adapted to be coupled to the burner body 20, in particular to a stem 24 extending from a lower portion of the burner body 20;
• Said first end 41 of the pin 40 is so realized as to fit into said stem 24, e.g. said first end 41 may be so realized as to have a thread adapted to be coupled to a female thread (not shown) of said stem 24.
• said intermediate body 43 of the pin 40 is advantageously equipped with gripping means facilitating the screwing of the pin 40 into the stem 24.
• the burner body 20 and the pin 40 are made of different materials.
• the burner body 20 may be made of aluminium alloy
• the pin 40 may be made of steel, the latter material offering the advantage of being less subject to wear than aluminium.
• the two elements can be made as one piece.
• each clip 50 is substantially U-shaped and comprises:
• restriction 53 in particular obtained between said base 51 and said pair of bent ends 52, said restriction 53 being adapted to hold the first end 41 of the pin 40 in such a way as to provide a snap fitting between the pin 40 and the clip 50,
• said first window 14 being obtained in a bracket 13 associated with the cup 10, said bracket 13 being in particular made as one piece with the cup 10 or mechanically fastened thereto.
• the special provision of the second snap fitting means 40, 50 according to the embodiment shown in Fig. 9 allows to provide a gas burner 1, in particular for a cooking appliance, which is so realized as to allow the cup 10 to be coupled to the burner body 20 quickly and without difficulty, even by users without any specific technical skills.
• the second snap fitting means 40, 50 allow to obtain a burner 1 characterized by a safe coupling between the cup 10 and the burner body 20 that avoids any malfunction of the burner 1.
• said second snap fitting means 40, 50 allow to properly position the burner body 20 and, as a result, to properly associate the flame divider 30 and possibly a pan supporting grate (not shown in the drawings) with the burner body 20, thus preventing any damage to both the user of the burner 1 and to the environment around the burner 1.
• Fig. 10 one can also notice that the burner body 20 and the flame divider 30 lie substantially entirely over a cooking top PC of a cooking appliance (not shown in the drawings).
• a further advantage deriving from the provision of the coupling means 40, 50; 60, 70 is that they facilitate the cleaning of said cooking top PC, in that the burner 1 according to the present invention will have no parts protruding from the cooking top PC when the burner body 20 and the flame divider 30 are separated from the cup 10.
• Fig. 10 also shows that between the burner body 20 and the flame divider 30 a compartment (designated as a whole by reference numeral 22 in Fig. 10) is obtained for letting the gas flow from the chamber 21 to said plurality of first apertures 31.
• Said compartment 22 comprises:
• first section 22a a substantially straight first section 22a, said first section 22a being positioned horizontally on top of the Venturi effect chamber 21;
• a second section 22b substantially directed downwards, in particular towards the cup 10;
• a third section 22c substantially directed upwards, in particular towards the flame divider 30.
• compartment 22 specifically refer to a sectional side view of the burner 1 and of the compartment 22.
• Said compartment 22 is shaped substantially like a sickle with the blade turned upwards, in particular, when viewing a side section of the compartment 22, starting from the axis A- A and extending towards the outside of the burner 1; in substance, the shape of the compartment 22 is similar to that of a question mark laid down (i.e. substantially horizontal).
• the compartment 22 has a shape substantially corresponding to the shape of the top of the burner body 20 and of the underside of the flame divider 30, in that said compartment 22 is obtained in the space between the burner body 20 and the flame divider 30.
• the burner body 20 comprises a substantially U-shaped housing 23 surrounding the upper part of the Venturi effect chamber 21, and the flame divider 30 comprises a wall 30P extending under the flame divider 30 towards said housing 23.
• the particular shape of the compartment 22 allows to provide a. burner 1 which is so realized as to allow the gas to adequately reach the first apertures 31 of the flame divider 30, said first apertures 31 being adapted to allow the gas to escape and generate a "carpet flame".
• the gas is already conveyed at the exit of the Venturi effect chamber 21 towards the first apertures 31 in a safe and accurate manner.
• said shape of the compartment 22 allows to ensure optimal gas efficiency along with lower production costs of the burner 1.
• the first apertures 31 of the flame divider 30 are so realized as to have an elongated shape when viewed from above (i.e. when viewed in a substantially axial direction with respect to the axis A- A of the burner 1).
• said first apertures 31 are so realized as to have a substantially elliptic shape; it is however apparent that the elongated shape of said first apertures 31 may be different, e.g. substantially rectangular.
• the particular shape of said first apertures 31 turns out to be especially advantageous because they can be made easily and comfortably and because they can ensure optimal gas efficiency.
• the particular shape of the first apertures 31 allows to avoid the formation of a sort of barrier against secondary air, which can thus reach even the innermost portions of the flame divider 30, particularly in the presence of a food cooking container (not shown) placed over the burner 1, which otherwise might contribute to hindering the flow of secondary air.
• the particular shape of the first apertures implies a high- 0 2 combustion, resulting in the generation of only a small quantity (or even in the absence) of unburnt gases, without having to make complex and costly modifications to the realization of the burner 1.
• the flame divider 30 of the burner 1 is preferably so realized as to have a substantially circular shape when viewed from above.
• each first aperture 31 comprises a first portion 31a, a second portion 31b and an intermediate portion 31c, said second portion 31b being closer to a central area 30C of the flame divider 30 than said first portion 31a.
• each first aperture 31 is oriented in a substantially radial manner on said flame divider 30.
• each first aperture 31 is inclined relative to a radius R (in Fig. 5 a plurality of radii R are indicated by dashed lines) of said flame divider 30; this means that said first portion 31a and second portion 31b of each first aperture 31 lie each on a different radius R.
• each first aperture 31 is not much inclined relative to the radius R, preferably not so much as to make a second axis A2 of each first aperture 31 perpendicular to the radius R.
• first apertures 31 are shown to be inclined in the same direction at substantially the same angle relative to said radius R; it is however clear that the inclination of each first aperture 31 may also be different.
• the burner 1 also comprises a plurality of second apertures 32 for flame propagation.
• each second aperture 32 is positioned between a pair of said first apertures 31; in addition, said second apertures 32 have a substantially circular shape when viewed from above.
• each second aperture 32 is positioned in the proximity of:
• the flame divider 30 comprises profiled portions 33 adapted to allow room for said at least one ignition element 60 and/ or said at least one detection element 70.
• ducts 34 (visible in Fig. 1 and 2) are obtained which are adapted to allow the flow of a limited quantity of gas for flame ignition and/ or detection purposes. Said ducts 34 first allow the flame to propagate from the ignition element 60 towards the first apertures 31 and the second apertures 32, and then they allow the flame to reach the detection element 70 from the first apertures 31 and the second apertures 32.
• the burner 1 comprises a cup 10 associated with supply means 11, 12 for supplying gas to said burner 1.
• said supply means comprise an injector 11 delivering gas coming from a duct 12.
• the burner 1 also comprises a cup 10 and a burner body 20 associated with said cup 10, the burner body 20 comprising a Venturi effect chamber 21, in particular said chamber 21 being positioned substantially coaxial to said injector 11.
• said Venturi effect chamber 21 extends substantially vertically in a central position inside the burner body 20; it is clear that the Venturi effect chamber 21 may also extend in a substantially horizontal direction or be positioned otherwise inside the burner body 20.
• the burner 1 further comprises a flame divider 30 associated with said burner body 20 and comprising a plurality of first apertures 31 to allow the gas to escape, which are so realized as to generate a flame (not shown in the drawings).
• said flame divider 30 is made of a sintered material, in particular said sintered material consisting of stainless steel, a ceramic material or a metal alloy.
• Sintering is a process that allows to obtain solid bodies having a predefined shape from powders of different materials. There are many sintering methods, all of which have the following characteristics in common:
• step of powder compression- step of thermal compaction of the green body
• the powder particles progressively join together, thus increasing the density of the object.
• the realization of the flame divider 30 according to the present invention turns out to be particularly advantageous, in that it facilitates the making of the plurality of first apertures 31 adapted to generate the flame, thus reducing the production times and costs of the entire burner 1.
• a special realization of the flame divider 30 allows to obtain very complex shapes without having to carry out costly machining operations on hard materials.
• Sintering also allows to obtain first apertures 31 with any shape, regardless of the desired thickness of the flame divider 30.
• said plurality of first apertures 31 are made during the sintering process in a manner such as to generate a "carpet flame", i.e. a flame that propagates outwards from the burner 1 in a substantially axial direction with respect to the axis A- A of the burner 1.
• said first apertures 31 are so realized as to extend substantially parallel to the axis A- A of the burner 1.
• said first apertures 31 are so realized as to have an elongated shape when viewed from above (i.e. when viewed in a substantially axial direction with respect to the axis A-A of the burner 1).
• said first apertures 31 are so realized as to have a substantially elliptic shape; it is however apparent that the elongated shape of said first apertures 31 may be different, e.g. substantially rectangular and, preferably, with bevelled corners.
• the particular shape of said first apertures 31 turns out to be especially advantageous because they can be made easily and comfortably and because they can ensure optimal gas combustion.
• the particular shape of the first apertures 31 allows to avoid the formation of a sort of barrier against secondary air, which can thus reach even the innermost portions of the flame divider 30, particularly in the presence of a food cooking container (not shown) placed over the burner 1, which otherwise might contribute to hindering the flow of secondary air.
• each first aperture 31 comprises a first portion 31a, a second portion 31b and an intermediate portion 31c, said second portion 31b being closer to a central area 30C of the flame divider 30 than said first portion 31a.
• each first aperture 31 is oriented in a substantially radial manner on said flame divider 30.
• each first aperture 31 is inclined relative to a radius R (in Fig. 2 a plurality of radii R are indicated by dashed lines) of said flame divider 30; this means that said first portion 31a and second portion 31b of each first aperture 31 lie each on a different radius R.
• each first aperture 31 is not much inclined relative to the radius R, preferably not so much as to make a second axis A2 of each first aperture 31 perpendicular to the radius R.
• first apertures 31 are shown to be inclined in the same direction at substantially the same angle relative to said radius R; it is however clear that the inclination of each first aperture 31 may also be different.
• the burner 1 according to the present invention further comprises a plurality of second apertures 32 for flame propagation.
• each second aperture 32 is positioned between a pair of said first apertures 31; in addition, said second apertures 32 have a substantially circular shape when viewed from above.
• each second aperture 32 is positioned in the proximity of:
• the flame divider 30 comprises profiled portions 33 adapted to allow room for at least one ignition spark plug 60 and/ or at least one thermocouple 70; in particular, as can be seen in Fig. 1, said at least one ignition spark plug 60 and at least one thermocouple 70 are associated with the cup 10 of the burner 1, e.g. through a bracket 13 preferably made as one piece with the cup 10.
• ducts 34 are obtained which are adapted to allow the flow of a limited quantity of gas for flame ignition and/ or detection purposes. Said ducts 34 first allow the flame to propagate from the ignition spark plug 60 towards the first apertures 31 and the second apertures 32, and then they allow the flame to reach the thermocouple 70 from the first apertures 31 and the second apertures 32.
• the provisions of the present invention allow to provide a burner 1 which is so realized as to allow to obtain optimal gas efficiency along with lower production costs.
• the particular shape of the first apertures 31 allows to avoid the formation of a sort of barrier against secondary air, which can thus reach even the innermost portions of the flame divider 30.
• a further advantage of the burner 1 according to the present invention is that its particular realization allows to obtain a high-0 2 combustion, resulting in the generation of only a small quantity (or even in the absence) of unburnt gases.
• the provisions of the present invention allow to provide a burner 1 having a reduced number of components; this facilitates assembly and/ or disassembly and/ or cleaning operations.
• the burner 1 according to the present invention is so realized as to allow the gas to adequately reach the first apertures 31 of the flame divider 30, said first apertures 31 being adapted to generate a "carpet flame".
• the provisions of the present invention therefore allow to provide a burner 1 which is so realized as to allow to obtain optimal gas efficiency along with lower production costs of said burner 1.
• a further advantage of the burner 1 according to the present invention is therefore that the particular realization of the compartment 22 and of the first apertures 31 allows to obtain a high-0 2 combustion, resulting in the generation of only a small quantity (or even in the absence) of unburnt gases.
• the provisions of the present invention allow to provide a burner 1 having a reduced number of components; this facilitates assembly and/ or disassembly and/ or cleaning operations.
• a further advantage of the present invention is that the provision of the snap fitting means 40, 50 according to the present invention allows to provide a gas burner 1 which is so realized as to allow the cup 10 to be coupled to the burner body 20 quickly and without difficulty, even by users without any specific technical skills.
• the snap fitting means 40, 50 allow to obtain a burner 1 characterized by a safe coupling between the cup 10 and the burner body 20 that avoids any malfunction of the burner 1.
• said snap fitting means 40, 50 allow to properly position the flame divider 30 and, as a result, to properly associate the flame divider 30 and possibly a pan supporting grate (not shown in the drawings) with said burner body 20, thus preventing any damage to both the user of the burner 1 and to the environment around the burner 1.
• the special provision of the coupling means 40, 50; 60, 70 shown in Figs. 8, 9 and 10 allows to provide a gas burner 1, in particular for a cooking appliance, which is so realized as to include removable components, so that the cooking top can be accurately cleaned after removing said components, since the cooking top will have no protrusions which might hinder the cleaning operations.
• said coupling means 40, 50; 60, 70 allows to provide a gas burner 1 which is so realized as to allow the cup 10 to be coupled to the burner body 20 quickly and without difficulty, even by users without any specific technical skills.
• the coupling means 40, 50; 60, 70 allow to obtain a burner 1 characterized by a safe coupling between the cup 10 and the burner body 20 that avoids any malfunction of the burner 1.
• the ignition element 60 and/ or the detection element 70 will prevent the burner 1 from operating.
• said coupling means 40, 50; 60, 70 allow to properly associate the flame divider 50 and possibly a pan supporting grate (not shown in the drawings) with said burner body 20, thus preventing any damage to both the user of the burner 1 and to the environment around the burner 1.
• a further advantage deriving from the provision of the coupling means 40, 50; 60, 70 is that they facilitate the cleaning of a cooking top PC that houses the burner 1, in that the burner 1 according to the present invention will have no parts protruding from the cooking top when the burner body 20 and the flame divider 30 are separated from the cup 10.
• the use of a sintered material for manufacturing the flame divider 30 according to the present invention turns out to be particularly advantageous, in that it facilitates the making of the flame divider 30.
• the present invention allows to create the plurality of apertures 31 and 32 in a single step, whatever the thickness of the flame divider 30, thereby reducing the production times and costs of the entire burner 1.
• said particular realization of the flame divider 30 allows to obtain very complex shapes without having to carry out costly machining operations on hard materials.
• first apertures 31 and/ or second apertures 32 having a constant section along the whole thickness of the flame divider 30, since such a process (unlike alternative technologic processes) requires no drafts. Therefore, when the flame divider 30 is to generate a carpet flame, the first apertures 31 and/ or the second apertures 32 will remain vertical throughout their extension.
• first apertures 31 having an elongated shape other than elliptic, such as, for example, a rectangular shape with bevelled corners.
• FIG. 3 and 4 A further variant is shown in Figs. 3 and 4; as can be seen in such drawings, those first apertures 31 and/ or second apertures 32 neighbouring to said ignition spark plug 60 and/ or said thermocouple 70 are so realized as to include second ducts 35 adapted to allow the flow of a limited quantity of gas for flame ignition and/ or detection purposes. Said second ducts 35 first allow the flame to propagate from the ignition spark plug 60 towards the first apertures 31 and/ or the second apertures 32, and then they allow the flame to reach the thermocouple 7 from the first apertures 31 and/ or the second apertures 32. Furthermore, as is especially visible in the top view of Fig.
• said second ducts 35 may be so realized as to further elongate the shape of said first apertures 31 and/ or of said second apertures 32 (it should be noted that in Figs. 3 and 4 the second ducts 35 are not shown when associated with the second apertures 32). De facto, in the variant shown in Figs. 3 and 4 said second ducts 35 are integrated into at least one of the first apertures 31 and/ or at least one of the second apertures 32, so as to form a single entity (preferably an elongated hole) of said flame divider 30 and thus simplify the realization thereof.
• first apertures 31 having an elongated shape other than elliptic, such as, for example, a rectangular shape with bevelled corners.

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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)

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• 2012
  • 2012-11-02 EP EP12799621.3A patent/EP2773905B1/de active Active
  • 2012-11-02 WO PCT/IB2012/056115 patent/WO2013065018A2/en active Application Filing
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