US20150345800A1

US20150345800A1 - Low cost burner

Info

Publication number: US20150345800A1
Application number: US14/723,878
Authority: US
Inventors: Roberto Cabrera Botello
Original assignee: Mabe SA de CV
Current assignee: Mabe SA de CV
Priority date: 2014-05-28
Filing date: 2015-05-28
Publication date: 2015-12-03
Also published as: BR102015012467A2; MX383153B; MX2014006384A; CA2891247A1

Abstract

A gas burner comprising a section for mixing combustible gas with air; a cover lid closing the mixing section; and a crenellated wall comprising first segments with a first thickness and one or more second segments with a second thickness greater than the first thickness, the second segment allows the cover lid to be sitting and placed over the wall, and main portholes which are constant for a determined length of said main portholes from an inside towards an outside of the crenellated wall, and near the outside of the crenellated wall, the height of the porthole is decreased by virtue of an α angle; one or more secondary portholes with a size smaller than the main portholes, wherein the at least one secondary porthole has a change in direction in such a way, that the height of the at least one secondary porthole decreases from the inside towards the outside of the crenellated wall according to a β angle until the height of the porthole achieves a constant height near the outside of the wall; and two or more tertiary portholes per each first and second segment with a half cane shape, the diameter of each half cane being equal to the width and depth of said tertiary porthole, wherein said tertiary portholes are of lesser size than the at least one secondary porthole.

Description

FIELD OF THE INVENTION

Present invention lies in the field of gas burners, particularly burners used in household appliance equipment, such as stoves, kitchens or cooking surfaces.

BACKGROUND OF THE INVENTION

A great variety of burners can be found in the marketplace for use in household appliances or industrial ones based on an atmospheric Bunsen burner; initially, the main objective of these was to provide a flame which would turn on over the utensils to be heated; achieving this without considering efficiency aspects of the combustibles used in the heating or ecologic oriented aspects, heating speed, the shape of the cooking utensils, among others, through time the design of the burners has evolved towards the solving of the above mentioned aspects.
Currently, a considerable amount of burners for use in household appliances exists in the marketplace; initially, the main objective of these was to provide a flame which would turn on over the utensils to be heated without considering efficiency aspects of the combustibles used in the heating or ecologic oriented aspects; through time the design of the burners has evolved towards the solving of the above mentioned aspects, among others.
As background to the present invention, applicant has knowledge of the below discussed documents.
In patent application with publication number EP 0 554 511 an atmospheric gas burner is described which has a primary air pre-mixer, with a ring burner which has exit gas ducts and a cover for the burner, designed should it be appropriate as a single piece with the ring, as a solution proposed for atmospheric burners in particular as the NO_xcontent in the burn gas which is produced, as well as the CO content are both considerably reduced, and particularly within a very broad adjustment range between the open and closed positions. The above is achieved thanks to the central axis of the exit ducts for the gas have a 0° deviation angle in regards to an assigned radius to the respective exit opening.
In U.S. Pat. No. 1,598,996 gas burners for general use are described in which the inner parts are freely accessible, through which the burner is adapted to be easily and quickly cleaned in order to eliminate carbon deposit residues as well as grease and other residues. Similarly this burner is provided with an upper cover lid which can be removed off the burner for the previously described purposes, and at the same time, it is set with a firm connection which seals the body of the burner against any possibility of a combustible leak between the contact surface of the cover lid and the body of the burner. Additionally, the burner is provided with two parts in which the body of the burner is coupled unto a mixing tube which is adapted to be removed in a slideable manner. The burner is provided with means to ensure a mixture of air and combustible prior to ignition and burning of the combustible, in order to decrease the carbon deposits to a minimum and produce a flame at the highest possible intensity.
Document U.S. Pat. No. 7,731,493 by Sartine et al describes a circular Bunsen burner for household use, which comprises a pattern of a main porthole through a secondary porthole and through this be able to form the porthole crown of a circular wall, wherein thanks to this highly simplistic design, it presents the serious problem that the speed at the portholes is very high, especially at the main porthole, this, such as the document itself indicates, creates flame detachment or a poor anchoring of the flame dart on the crown of the burner, which causes a poor combustion in addition to the flame of the crown has a high tendency to shut itself off; to partially solve this problematic aspect the inventor relates that he set a step on the periphery of the crown of the burner for enlarging the lower diameter of the crown of portholes; with such luck that the discussed peripheral step is in fluid contact with the porthole, preferably with the main portholes, with the end purpose of lengthening the duct of the main porthole in some manner, through the implementation of the referred to peripheral step, with this the inventor attempts to lower the speed of the mixture within the porthole, which clearly seems to have low functionality, impractical and inefficient, knowing that a better porthole design is required in order to avoid the flame from tending to detach, given that as the inventor points out himself in the document under discussion, the stability of a flame is a function of: i) the speed of combustion of the air-combustible mixture; ii) the mass reason of the air-combustible mixture; iii) the total area of porthole of the crown of the burner; which ends up being a bit contradictory upon studying the discussed document that the inventor knows the theory but upon implementing his burner to practice, he completely ignores said principles by creating completely straight portholes without any means whatsoever for efficiently controlling the speed of the air-combustible mixture which flows through the portholes, thereby being forced to use a widely known solution in the field to create a little extra friction which will allow for a small decrease in the speed of the air-combustible mixture, by means of the referred to peripheral step through which means it can in a palliative manner poorly anchor the flame dart onto the crown; continuing on with the study of the referred to crown, it can also be seen that the design proposed by the inventor of the document under discussion alleges and presumes that his design allows him to use a cover lid of almost the same diameter of that of the crown, which seems obvious that such a design stimulates the separation of the flame dart from the crown, which leads us to think that the burner in reference lacks all usefulness or practical functionality.
Regarding the burners contained in the above cited documents, none of them has the structural and operational features of the burner in present invention, for example, none of the prior burners possesses at least two air-combustible mixture sections which would allow the adequate mixing or combining of the air with the combustible, also the referred to mixture sections allow for the creation of a desirable mass flow towards the portholes in order that the speed of the flow of the mixture be such that it avoids the detaching of the flame, the dart remaining anchored to the burner furthermore encouraging an efficient combustion; also none of the prior documents references a particular design for the portholes which changes the direction of the mass flow of the air-combustible mixture, decreasing the speed of the referred to mass flow within the porthole, in addition to strategically directing it towards the utensils to be heated which are set on the burner; thereby guaranteeing correct anchoring of the flame dart to the body of the burner as well as optima combustion.
One aspect of present invention may be to provide a burner with at least two mixture sections, a pre-mixing area precisely at the end of the Venturi tube which helps in the mixing of the air-combustible which has been dragged by means of the Venturi tube, also said pre-mixing chamber helps to uniformly dosage the determined mass flow to the mixture chamber which surrounds the pre-mixture chamber, in this second chamber the possible flow variations which could occur when functioning as a buffer area are homogenized, helps continue the air-combustible mixture towards the porthole section, with such luck that the speed of the liquid within the portholes be uniform and within a determined parameter which avoids flame detachment.
Another aspect of the present invention may be constituted by providing a burner which on its main portholes contain a change of direction which allow for the decreasing and controlling of the mass flow of the air-combustible mixture which flows within this in addition to strategically directing the flame dart, avoiding the detachment of flame and thus favoring a correct as well as an efficient combustion, in addition to helping achieve a better contact of the flame darts with the utensils to be heated which are set over the burner.
Another aspect of present invention may be to provide a burner with a peculiar design for the cover lid of the burner which allows interacting with the novel porthole design, helping to correctly anchor the flame darts to the body of the burner.
Another aspect of the present invention may be to provide a burner with good energy efficiency, as well as low carbon monoxide levels, be easy to manufacture and have a low cost.
Yet another aspect of the present invention may be to provide the burner with at least one air ring on the lower part of the burner, precisely under the porthole for improving the secondary air mass flow towards the base of the flames.

BRIEF DESCRIPTION OF THE INVENTION

Present invention lies in the field of gas burners, particularly Bunsen burners used in household appliance equipment, such as stoves, kitchens or cooking surfaces; if there is a large variety of these burners both in the marketplace as well as in the state of the art, these are quite difficult to conceive and put into practice, given that they require extensive laboratory tests as well as advanced knowledge in the areas of combustion, fluids, heat transfer and mechanics among others; having a burner which works is an art in itself, and even more difficult is making a burner which functions in an efficient manner, and even further difficult is achieving all this at a low cost, as this implies advanced knowledge of manufacturing processes. So that given the above described, it is evident that the burner of present invention has been particularly difficult to conceive, put into practice and commercialize, as it has been optimized in all of its aspects, as it renders both good energy combustion efficiency, it is easy to manufacture, the construction materials have been optimized to achieve a burner with low cost materials, in addition to being visually attractive.
The burner object of present invention is formed on a base of some metallic material preferably aluminum, or with an alloy which contains aluminum, the body of the burner is achieved by injection or forging; the cover lid by die cutting or casting iron, forging, sintering, among others, which preferably is manufactured with steel, the burner does not have any moving parts, nor does it require another assembly other than the cover lid which is only set on the peripheral crenellated wall of the cylindrical wall of the portholes.
On the lower part of the burner an inlet is set through which the combustible being expulsed is allowed out, the inlet is directed towards a Venturi tube set on the lower central part of the burner, the referred to Venturi tube drags the primary air found surrounding this and suctions it towards the inside part of the tube to lead in a fluid manner, the primary air which has been dragged by the combustible towards the pre-mixing chamber which helps mix the air-combustible which has been dragged by means of the Venturi tube. Said pre-mixing chamber also helps to uniformly dosage a determined mass flow to the mixture chamber which surrounds the pre-mixture chamber. In this second chamber the possible flow variations which could occur upon homogenizing the volume of the air-combustible mixture before entering the portholes become uniform, knowing that a type of peripheral ring is formed, which homogenously distributes the air gas mixture to the portholes, it also regulates the energy of the fluid of said air-combustible mixture, thus homogenously dosing a mass flow towards the portholes which helps to continue with the mixing of the air-combustible, dosing the mixture of the air-combustible towards the porthole section, with such luck that the speed of the fluid within the portholes be uniform and within a determined parameter which avoids flame detachment; the main portholes on their part are set with a peculiar design, knowing that the referred to portholes change direction of the mass flow of the air-combustible mixture which emanates from the mixture chamber which forces a decrease in the speed of the referred to mass flow within the porthole, in addition to strategically directing it towards the utensils to be heated set on the burner; thereby guaranteeing correct anchoring of the dart flame to the body of the burner as well as optimal combustion. Precisely under the portholes, on the lower part or outer base of the body of the burner, present invention can be set with an air ring, said air ring allows for the improving of the secondary air flow towards the base of the flame.

BRIEF DESCRIPTION OF THE FIGURES

The illustrated embodiment may be described referencing the accompanying figures, which:

FIG. 1 shows an isometric view of the burner set over a volcano with a grill.

FIG. 2 is an exploded view of the burner assembly.

FIG. 3 a is an isometric upper view of the body of the burner.

FIG. 3 b is a lower conventional perspective view with the burner body cut by one of its secants.

FIG. 4 shows a cross cut of the assembly of the burner in which the air flows, combustible and air-combustible mixture can be seen.

FIG. 5 shows an isometric view of the body of the burner, showing in detail the crenellated wall, the three types of portholes as well as how they are set over the referred to crenellated wall.

FIG. 6 is a cross cut of the secondary porthole, where its shape can be appreciated, as well as the secondary air flows in addition to the air-combustible mixture.

FIG. 7 is a cross cut of the main porthole where its shape can be appreciated, as well as the secondary air flows in addition to the air-combustible mixture.

All figures have been drawn to help ease the basic explanation of the teachings of present invention. The Figure extensions, regarding their number, position, relation and dimensions of the parts to form the preferred embodiment(s) shall be explained or will lie within skillfulness of the art once having read and understood the teachings of present invention. Additionally, the exact dimension and dimensional proportions to grant strength, weight and specific requirements will also be within the skillfulness of the art after having read and understood the teachings of present invention.

DETAILED DESCRIPTION OF THE INVENTION

Definitions

The use of the term “approximately” provides an additional determined range. The term is defined in the following manner: the additional range set by the term is approximately ±10%. By way of example, but not in a limitative way, if the term reads “approximately 8 cm”, the exact range lies within 7.2 to 8.8 millimeters.
FIG. 1 illustrates the burner 25 object of present invention, set over a surface or cover 19, the referred to cover 19 preferably comprises a volcano 28 which is understood as a truncated cone protuberance in a volcano manner over which the burner 25 is placed, in an alternative embodiment of present invention, the cover 19 can be completely smooth, or lacking volcanoes; given this the burner 25 is placed flush in regards to the cover 19; in another alternative embodiment the cover 19 can have crammed recesses in truncated conical shape which can house the burner 25. In either case, over the burner assembly 25 (with or without volcano 28) a grill 27 is placed, which comprises a series of bars which extend over the burner 25 and which help support the kitchen utensils to be heated; the distance between the grill 27 to the burner 25 will have to be determined experimentally in addition to complying with the official requirements for each country, which obviously will affect their design. For the design of a burner 25, it is desirable to have a grill design 27, this desired pairing would be good to consider for the combustion efficiency tests, knowing that the bars of the grill 27 are over the burner 25 it is prudent to design portholes on purpose for such a situation, reason for which the burner 25 of present invention comprises a series of secondary portholes 30 with a reduced dart which allows for the transfer of the flame between portholes (20, 30, 40) without excessively heating the bars of the grill 27 which helps save combustible as well as improving the combustion, given that without these considerations, the flame dart would be cast on the lower part of the bar of the grill 27 overheating the latter in addition to obtaining adverse results for the combustion given the obstruction, which decreases the efficiency of the burner.
Now then, FIG. 2 shows us an exploded view of the burner 25; and FIG. 4 shows us an isometric cross cutoff of the burner 25 assembly; both figures are useful for describing the assembly components. On the lower part of FIG. 2 the nozzle 14 can be seen which on its lower end is coupled to the tube 14 which transports the combustible. The nozzle 14 on its outer periphery comprises a rope on which a mini-connector 15 is coiled, the mini-connector 15 and nozzle 14 assembly is fastened onto the lower part of the support 16, thanks to the referred to support 16 comprising a hole in the lower part through which the mini-connector 15 and nozzle 14 assembly is introduced, to later have a nut coiled over a mini connector 15; this assembly is coupled to the lower face of the volcano 28 by means of some screws or another fastening means 17. The volcano 28 on its upper face comprising a hole at the center of it through which the Venturi tube 12 of the burner 25 is introduced, which is concentrically aligned with the nozzle 14 leaving a determined height between the referred to nozzle 14 and the lower part of the Venturi tube 12 which allows aspirating or dragging the primary air, once combustible has been made to pass through the nozzle 14, given the Venturi effect caused there.
The lower face of the burner 25 is set with some feet 31 which lend the burner 25 support over the upper face of the volcano 28, allowing for the creation of a gap or space between the lower face of the burner 25 and the upper face of the volcano 28, which allows for free air flow, which partly aids in cooling the base of the burner 25 as well as being able to supply air in a uniform manner to the base of the burner 37. The burner 25 is also set with a spark plug 22 set on a particular point of its periphery, with such luck that the burner 25 has been provided with a grommet 38 which is to house the spark plug 22; the referred to spark plug 22 is fastened in place by means of a safety 38 and support 41 in “U” shape; the complete burner 25 assembly discussed above is crowned with the cover lid 10, which itself is placed only on the crenellated wall or porthole wall 26.
Now we turn our attention to FIGS. 3 a, 3 b and 4 which illustrate the body 11 of the burner 25; FIG. 3 a is an isometric upper view of the referred to body 11; on its part FIG. 3 b is a lower isometric view with the burner body cut on the crenellated wall 26 which allows us to see the different portholes (20, 40); FIG. 4 shows an isometric cross cut of the assembly of the burner in which the air flows, combustible and air-combustible mixture can be seen. From these figures we highlight the Venturi tube 12 situated on the lower part of the body 11, which is in fluid connection with the pre-mixing chamber 23 which surrounds the duct on the upper part of the Venturi tube 12, the inner crown 35 is found in ring-like shape, which protrudes cylindrically over the base of the pre-mixing chamber 23. The referred to inner crown 35 decreases the distance or gap between the base of the pre-mixture chamber 23 and the lower face of the cover lid 10. Now then, it should be highlighted at this point that the combustible emanating from the nozzle 14, drags the primary air which exists in the vicinity of the lower part of the Venturi tube 12 given the Venturi effect, so that the air and the combustible have not fully mixed. Thereby, upon arriving at the pre-mixing chamber 23, thanks to the barrier formed by the inner crown 35 is conducive to fluid composed of air as well as combustible having a first opportunity to mix together. Also, the referred to inner crown 35 helps dosing the mass flow of the air-combustible mixture towards the mixture chamber 24; knowing that once the air-combustible is pre-mixed in the pre-mixture chamber 23, air-combustible the pre-mixture has to pass between the upper face of the inner crown 35 and the lower face of the cover lid 10, in said narrowness the speed of the mass flow of the pre-mixture increases, which causes the referred to pre-mixture mass flow arrive at the mixture chamber 24 with a desirable speed and in a uniform manner. The referred to mixture chamber 24 is formed on its lower part by the upper exposed face of said mixture chamber 24, one side is formed by the outer wall of the inner crown 35, the remaining side formed by the inner face of the crenellated wall 26. This mixture chamber 24 encourages the mixing on the air-combustible and also functions as a uniform area for the air-combustible mixture in a reservoir-like fashion; similarly, another function is that of homogenizing the speed and pressure of the mass flow of the air-combustible mixture prior to entering the portholes, knowing that: it creates a type of periphery ring which itself distributes uniformly the air gas mixture towards the portholes (20, 30, 40). The mixture chamber 24 also regulates the flow energy of said air-combustible mixture, through which it obtains a desirable mass flow speed of the air-combustible mixture towards the portholes (20, 30, 40).
FIGS. 5, 6, 7 are useful to be able to see the porthole shapes (20, 30, 40); for its part FIG. 5 is a segment in isometric of the body of the burner 11, in which the crenellated wall 26 can be seen which surrounds the periphery of the body of the burner 11, it is over the referred to crenellated wall 46 that the three different types of portholes are formed, which the burner 25 object of present invention comprises; it should be highlighted at this point that the crenellated wall 26 can comprise two thicknesses measured from the inner face towards the outer face of the referred to crenellated wall 26 exactly at the sections of crenellated wall 26 which house the tertiary portholes 40 and which are separated from each other by a main porthole 20 or by a secondary porthole 30, such as can be seen in FIG. 5. Now then, the first thickness called “e1” which has a preferable width which is used in the large majority of the sections which form the crenellated wall 26; said thickness varies between approximately 5 mm to 8 mm; the second thickness called “e2” is used in a sporadic manner over the periphery which runs the crenellated wall 26, said thickness varies between approximately 8 mm to 10 mm. The fact of having a segment of the crenellated wall with a different thickness, that is “e1”<“e2” allows that “e2” which is thicker to protrude over the rest of the crenellated wall 26 which has a “e1” thickness and in this way be able to adequately sit the cover lid 10 over the crown of the burner or over the crenellated wall 26 allowing to adequately adjust and having a desirable set, knowing that the cover lid as well as the burner suffer thermal expansion during their operation, so that in the preferred embodiment of the invention at least three segments of crenellated wall 26 having an “e2” width which allows pertinent support to the cover lid over the crenellated wall 26; leaving the ability to use any number of segments with an “e2” thickness to an alternative embodiment. Following the same order of ideas, the crenellated wall 26 is composed of the referred to sections which house the tertiary portholes 40, in this highly peculiar design for the crenellated wall 26 object of present invention at least two tertiary portholes 40 per segment are required, having the possibility of having more than two in an alternative embodiment of the present invention. The referred to tertiary portholes in a preferred embodiment have a “half cane” shape, which is set over the upper face of a determined segment of the crenellated wall 26, where the diameter of the half cane is equal to the width and depth of the porthole, which varies between approximately 0.8 mm to 3 mm. The referred to tertiary portholes 40 in half cane have a straight transversal section thus allowing for the passage of the air-combustible mixture emanating from the mixture chamber 24, without any greater restriction than that set by its shape as well as its location. In an alternative embodiment of the present invention the half cane shape can be a trapezoidal, square, rectangular, oval or almost any other type of shape section channel, these portholes conserve this porthole area which itself is very similar to the obtained in the preferred embodiment (half cane). Now then, the secondary portholes 30 which are used sporadically over the crenellated wall 26 such as can be seen in FIGS. 3 a, 5 just like the main portholes 20 in the same way, help to separate the segments of the crenellated wall 26 which house the tertiary portholes 40. The secondary portholes 30 which have a smaller size than the main portholes 20 but are larger than the tertiary portholes 40 follow the same shape than that of the grill 27, so that its location within the crenellated wall 26 will completely depend on the design of the grill 27 which is set on the burner 25. Now then, having a series of secondary portholes 30 allows for energy savings knowing that the referred to secondary portholes 30 will serve to create transfer flame darts, that is the being able to transfer the flame form a tertiary porthole 40 in a given segment of the crenellated wall 26 to another tertiary porthole 40 located in an adjacent segment of the crenellated wall 26, thereby allowing for correct transfer of the flame over the outer periphery of the crenellated wall 26. In this way, the secondary porthole 30 emits a smaller sized dart which is not collapsible with the finger or part of the grill 27 which is found set over the burner 25, with such luck that the design of the grill 27 will determine the number of secondary portholes 30 which are located within the crenellated wall 26. Turning our attention to FIG. 6 it can be seen that this illustrates a cross cut of the referred to secondary porthole 30; here we can see that unlike the tertiary portholes 40, the secondary porthole 30 is not straight, but rather it has a change of direction, which causes the mass flow of air-combustion mixture which emanates from the mixture chamber 24 and which moves within the referred to secondary porthole 30, in this way the height of the porthole decreases from the inside towards the outside of the crenellated wall 26, following a β angle which varies between approximately 45° to 85°, as long as the porthole height has a constant determined height which varies between approximately 1 mm to 2 mm and does not exceed 75% of the total length of the secondary porthole 30, which causes the air-combustible mixture to increase its speed but only allows the passage of a determined mass flow with a certain speed and direction, the latter being specifically horizontal. In this manner, the flow which passes through the straight horizontal throat at the end of the secondary porthole 30 collapses against the bezel of the cover lid 10, which allows for correctly anchoring of the flame dart set by the secondary porthole 30, knowing that an area of turbulence is created exactly under the referred to bezel 33, which forces the mass flow of the air-combustible mixture emanating from the secondary porthole 30 to go downwards to later go up, thereby successfully anchoring the flame dart to the burner 25; coupled to that discussed above in reference to the secondary porthole 30, one must keep in mind that we want to achieve a short flame dart which promotes an efficient transfer of flame between the tertiary portholes 40, obviously avoiding flame detachment or poor combustion.
Now turning our attention the main portholes 20 whose cross cut is illustrated in FIG. 7; the referred to main portholes 20 have a somewhat inverse shape to that outlined of the secondary portholes 30 where the height of the main porthole 20 remains constant for a good section of the length preferably from approximately 50% to 75% of the length of the main porthole 20, thus for the remaining length the heights is decreased at an α angle, which varies between approximately 45° to 85°, which causes a brusque change of direction of the mass flow of air-combustible which travels from the main porthole 20 emanating from the mixture chamber 24, said radical change of direction causes the mass flow which travels from the main porthole 20 to lose energy; the change of direction also directs the flame towards the utensils to be heated set over the grill 27 and the burner 25, it can also be noted that the air-combustible mass which moves through the upper part of the main porthole 20 exactly upon exiting the referred to main porthole 20 collapses with the lower face of the bezel 33 of the cover lid 10, which causes that precisely under the bezel at the exit area of the main porthole 20, a turbulence area be generated which makes the flame dart emitted by the main porthole 20 be able to correctly anchor. Therefore, the shape of the porthole in a burner is such that it allows good exit speed which allows the flame dart to be cast upon the surface to be heated, seeing that having high speed ranges would encourage flame detachment, or conversely, having a slow speed for the flame would cause poor combustion as well as a low transfer level of caloric energy to the utensils to be heated. Therefore, the equilibrium achieved by such an ingenious shape of portholes (20, 30, 40) proposed, knowing that variables in direction and speed of mass flow of the air-combustible mixture which moves through the referred to portholes (20, 30, 40); thus achieving an efficient combustion, avoiding the much unwanted flame detachment in a burner which has ease of manufacture and therefore low cost.
In an alternative embodiment of the present invention on the base or the lower part of the body of the burner 11 exactly below the lowest part of the exits of the main portholes 20 set over the outer face of the crenellated wall 26, an air ring 36 can be placed, which (such as can be seen in FIGS. 6, 7) allows admitting an extra mass of secondary air towards the flame dart obtained by the portholes 20, 30 since the flame dart tends to drag the secondary air towards its surroundings. Thereby given the superficial cap limit effect the dart, emitted by the referred to portholes 20, 30 will tend to drag the secondary air which emanates from the base or lower part of the burner 11. The referred to alternative embodiment is desirable when for design reasons the volcano 28, the grill 27 or jointly as a set the cook top or cover lid 19 have a burner body with a greater diameter than that obtained through the preferred embodiment, thus in order to be able to “enlarge” the base of the burner, the air ring 36 can be used which allows supplying “extra” secondary air towards the portholes 20, 30 thus contributing a better combustion for the burner 25. The alternative embodiment currently discussed can also be desirable when for design reasons the cook top or cover lid 19 ends up sunken or submerged, this because the referred to cover lid 19 has very high walls on its periphery, which causes certain difficulty in obtaining a mass flow of secondary air towards the dart flames; similarly, the alternative embodiment under discussion is desirable when very large utensils are placed over the grill 27; or in another case, when the grill design is such that it hinders or obstructs the mass flow of secondary air towards the flame darts of the burner 25 to a great degree; but in either case, it is noted that the constant is a restriction of mass flow of secondary air towards the flame darts of the burner 25. To this end, the air ring 36 serves present invention well knowing that when the flame darts do not have sufficient secondary air surrounding the dart, the flame will tend to seek secondary air, which then causes the detachment of flame dart from the body of the burner 25, same which can cause a leak of the air-combustible mixture, a dangerous accumulation of air-combustible mixture between the cover lid 19 and the lower face of the cooking utensil or in a better case the combustion is carried out far away from the body of the burner. This phenomenon is known in the field as flame flotation, given that upon seeing how the flame darts deform, these appear to float upon completely detaching themselves from the body of the burner 25 in search of secondary air which they require to achieve a flame. Now then, the referred to air ring 36, thanks to the superficial cap limit, helps in preventing to a large degree the flame dart flotation phenomenon, emanating from the secondary air supply which is found close by to the lower part of the burner 25 in addition to that which is found flush with the cover, therefore FIGS. 6, 7 serve as visual support to help understand the referred to mass flow of secondary air towards the darts or flame base of the burner 25.
Having described present invention with sufficient detail, it is found as having an inventive grade, novelty and its industrial application being obvious, and taking into account that a person skilled in the art could infer changes to the burner object of present invention hereby described, where said changes would be comprised within the protection scope of the following claims.

Claims

1. A gas burner comprising:

a mixing tube which allows the mixture of a combustible gas with air;

a pre-mixture chamber which receives the mixture of the mixing tube, the pre-mixture chamber mixes the combustible gas with the air;

an inner crown which forms a barrier between the pre-mixture chamber and a mixing chamber, the mixing chamber formed by an outer wall of the inner crown, an inner face of a wall opposite to the outer wall and by the upper face of the gas burner;

a crenellated wall along the length of the periphery of the burner, the wall comprising

a plurality of first segments with a first thickness and at least a second segment with a second thickness greater than the first thickness, the second segment allows that a cover lid be seated and placed over the crenellated wall thereby covering the mixing tube, the pre-mixture chamber, the inner crown and the mixing chamber, and

a plurality of main portholes which are constant for a determined length of said main portholes from the inside towards the outside of the crenellated wall, and near to the outer part of the crenellated wall, the height of the porthole is decreased by virtue of an α angle;

at least one secondary porthole with a smaller size than that of the main portholes, wherein the at least one secondary porthole has a change of direction in such a way that the height of the at least one secondary porthole decreases from the inside towards the outside of the crenellated wall according to a β angle until the height of the porthole achieves a constant height near the outer part of the wall; and

at least two tertiary portholes per each first and second segment in a half cane shape, the half cane diameter is equal to the width and depth of said tertiary porthole, wherein said tertiary portholes are a smaller size than the at least one secondary porthole.

2. The burner according to claim 1, wherein the burner comprises some feet which lend the burner support over the face of a cover lid of a stove, providing a space between said burner and said face, thus allowing for free air flow.

3. The burner according to claim 1, wherein the inner crown has a height which is greater than the pre-mixture chamber and the mixing chamber, decreasing the distance between the base of the pre-mixture chamber and an inner face of the cover lid, thus the inner crown doses a mass flow of the mixture towards the mixing chamber.

4. The burner according to claim 1, wherein the segments are separated from each other by a main porthole or a secondary porthole.

5. The burner according to claim 1, wherein the first thickness varies between approximately 5 mm to 8 mm and wherein a second thickness varies between approximately 8 mm to 10 mm, allowing that said second thickness protrudes in relation to the remainder of the crenellated wall, in such a way that the cover lid is adjusted over the crenellated wall and has a set according to the crenellated wall.

6. The burner according to claim 1, wherein the diameter of the half cane of the tertiary portholes varies between approximately 0.8 mm to 3 mm and wherein the half cane has a cross cut section selected from amongst straight, curved, squared, rectangular or oval.

7. The burner according to claim 1, wherein the β angle varies between 45° to 85°, wherein the height of the constant part of the secondary porthole is between approximately 1 mm to 2 mm in height and wherein the length of the constant part of the secondary porthole is not greater than 75% of the total length of said secondary porthole.

8. The burner according to claim 7, wherein the flow of the mixture which passes through an outer part of the secondary porthole collapses against a bezel of the cover lid, anchoring the flame dart provided by the secondary porthole upon creating a turbulence area under said bezel.

9. The burner according to claim 1, wherein the constant length of the main porthole is approximately 50% to 75% of the total length of the main porthole, wherein α varies between 45° to 85°, where a mass flow which travels through said main porthole loses energy.

10. The burner according to claim 9, wherein a mass flow which passes through an outer part of the secondary porthole collapses against a bezel of the cover lid, anchoring the flame dart provided by the main porthole upon creating a turbulence area under said bezel.

11. The burner according to claim 1, wherein the burner under the portholes set on the crenellated wall, an air ring is placed, which drags the secondary air emanating from the lower part of the burner.

12. A gas burner comprising:

a section for mixing the combustible gas with air;

a cover lid closing the mixing section; and

a crenellated wall comprising

a plurality of first segments with a first thickness and at least a second segment with a second thickness greater than the first thickness, the second segment allows the cover lid to be sitted and placed over the wall, and

13. The burner according to claim 12, wherein the inner crown has a height greater than the pre-mixture chamber and the mixing chamber, decreasing the distance between the base of the pre-mixture chamber and an inner face of the cover lid, so that the inner crown doses a mass flow of the mixture towards the mixing chamber.

14. The burner according to claim 12, wherein the first thickness varies between approximately 5 mm to 8 mm and wherein a second thickness varies between approximately 8 mm to 10 mm, allowing that said second thickness protrudes in relation to the remainder of the crenellated wall, in such a way that the cover lid is adjusted over the crenellated wall and has a set according to the crenellated wall.

15. The burner according to claim 12, wherein the diameter of the half cane of the tertiary portholes varies between approximately 0.8 mm to 3 mm and wherein the half cane has a cross cut section selected from amongst straight, curved, squared, rectangular or oval.

16. The burner according to claim 12, wherein the β angle varies between 45° to 85°, wherein the height of the constant part of the secondary porthole is between approximately 1 mm to 2 mm in height and wherein the length of the constant part of the secondary porthole is not greater than 75% of the total length of said secondary porthole and wherein the mass flow which passes through an outer part of the secondary porthole collapses against a bezel of the cover lid, anchoring the flame dart provided by the secondary porthole upon creating a turbulence area under said bezel.

17. The burner according to claim 12, wherein the constant length of the main porthole is approximately 50% to 75% of the total length of the main porthole, wherein α varies between 45° to 85°, where a mass flow which travels through said main porthole loses energy and wherein the mass flow which passes through an outer part of the main porthole collapses against a bezel of the cover lid, anchoring the flame dart provided by the main porthole upon creating a turbulence area under said bezel.

18. The burner according to claim 12, wherein the burner under the portholes set on the crenellated wall, an air ring is placed, which drags the secondary air emanating from the lower part of the burner.

19. A stove, kitchen or cooking surface comprising the burner of any of the prior claims, wherein the stove, kitchen or cooking surface additionally comprise a grill set over the burner, and wherein the at least one secondary porthole emits a flame dart which has a greater size than that of a flame dart from the main porthole, in such a way that the flame dart of the secondary port hole does not collapse against the grill.

20. The stove, kitchen or cooking surface according to claim 19, wherein the design of the grill determines the number of secondary portholes found in the crenellated wall of the burner.