MXPA97010515A - An atmospheric gas burner assembly for better stability of the fl - Google Patents

Abstract

The present invention relates to a gas burner assembly for connecting to a gas source, the gas burner assembly comprising: a burner body having a side wall and a tubular main gas conduit, the gas conduit The tubular main has an inlet and an outlet, a plurality of primary gates positioned within the side wall so as to be in communication with the outlet of the tubular main gas conduit, a flame flare gate simmering inside the side wall in a relationship separated with the gates of the primary burner to provide a source of reignition, a stability chamber placed inside the body of the burner, the stability chamber defined on each side by a pair of deviators that extend radially, in the lower part by a surface upper part of the burner body, at the top by a lid, and by an end wall at the outlet to extend from the outlet to the top flame gate over low heat, and at least one stability input placed from at least one of the deviators so that the stability input is substantially perpendicular to a gas flow direction radially out of the outlet, the inlet stability is positioned near the outlet to create a large flame stabilizer pressure drop through the stabilization chamber

Description

AN ATMOSPHERIC GAS BURNER ASSEMBLY FOR BETTER STABILITY OF THE FLAME Background of the Invention This application relates to an atmospheric gas burner and in particular refers to an improvement in the stability of the flame of a gas burner. In general, atmospheric gas burners are used as surface units in articles for cooking with domestic gas. A significant factor in the performance of gas burners is their ability to withstand disturbances of air currents from their surroundings, such as currents in rooms, rapid movements of cabinet doors, and the most common, a manipulation quick oven door. Rapid manipulation of the oven door is particularly problematic, since opening and closing the oven door quickly, very often results in low pressure and high pressure conditions within the oven cavity. Since the flow, through which the combustion products of the furnace are removed, has a size to maintain the desired furnace temperature and, in general, is inadequate to provide sufficient air current for the re-equilibration, it passes A lot of air through and around the gas burners. This variation of the air around the gas burners, due to the conditions of the high and low pressure in the furnace cavity, is exhausting for the stability of the flame of the burners and can cause the extinguishing of the flame. The problem of flame extinction is particularly evident in sealed gas burner arrangements, in relation to the lack of an opening in the surface of the cooking pot around the base of the burner to prevent spills from entering the area which is under the cooking pot. The inherent cause of the instability of the flame is the low pressure drop of the fuel / air mixture passing through the burner hatches of a typical cooker burner. Although there is ample pressure in the fuel, the energy of the pressure is used to accelerate the fuel to the high injection speed that is required for the primary air intake. Very little of this pressure is recovered in the burner gates. A low pressure drop through the burners allows pressure disturbances to propagate through the environment to easily pass through the gates, thus pulling, momentarily, the flame towards the burner head and concluding in the thermal and cooling. the extinction. An additional problem is the rapid adjustments of the fuel supply for a burner with high burner inlet level at a low burner inlet level, very often they will cause the flame to extinguish while continuing the moment of the air current that enters the burner even when the fuel has been stopped, resulting in a momentary drop of the fuel / air ratio, causing extinction. Some commercial gas burners use dedicated expansion chambers to try to improve stability performance. These expansion chambers are designed to dampen disturbances of the currents before these disturbances reach the stable flame. This damping is to be used in a large expansion area between an expansion chamber inlet and an expansion chamber outlet, typically expanding by approximately a factor of ten. According to the speed of a disturbance of the current entering the neck of a burner, it is reduced approximately by a factor of ten before reaching a respective stability of the flame, thus reducing the probability of extinction of the flame. the flame. Expansion in large areas and damping disturbance typically do not occur in main and conventional burner hatches, making the main burners and conventional floodgates susceptible to flame extinction, especially when there are low burner inlet levels. The stability of the slow fire usually improves when the radius of the expansion area increases. If the entrance of an expansion chamber has a very small size, the gas entering the expansion chamber may be insufficient to maintain a flame in the expansion chamber of the gate. Commercial gas burners, such as those described in U.S. Patent No. 5,133,658, and in U.S. Patent No. 4,757,801, each issued to Le Monnier De Gouville et al., Use a gas chamber. expansion to improve the stability of the flame. The gas burners of De Gouville have a full forward of a number of main burner gates. An entrance of the expansion chamber is located in the plenary adjacent to the main floodgates of the flame. When a negative pressure disturbance enters the burner (suction, for example, caused by the opening of the oven door), the pressure falls and the speed of the current through the main burner gates is momentarily reduced causing an undesired extinction of the flames of the main burners. The flame of the expansion chamber, however, is less susceptible to extinction due to the damping effect described above. Although this type of gas burners with an expansion chamber provide better stability performance at low heat, the disturbances cause unwanted extinction. In addition, these expansion chambers have extremely large flares with high burner input levels. Accordingly, there is a need for a gas burner that is better able to withstand disturbances of air currents, especially at a low burner inlet level.

SUMMARY OF THE INVENTION In accordance with the invention, an assembly of a gas burner for connection to a gas source includes a burner body with a side wall and a gas main with an inlet area and a burner neck. The burner body further includes a plurality of main burner gates positioned within the side wall, with each main gate configured to support a respective main flame, and a slow flame flap gate positioned within the main burner gates. A stability chamber is placed inside the body of the burner to channel the fuel to the flame gate on a low flame. In one embodiment, the stability chamber has at least one stability entry positioned near the burner neck of the main gas conduit that provides the stability chamber with fuel by utilizing the static pressure associated with each stability entry. In another embodiment, the stability chamber has a small feed hole placed in the end wall in the burner neck of the main gas conduit. During the simmer operation, each configuration creates a comparatively large pressure drop within the entrance of the stability chamber because of the placement of the stability inlets or the feed neck near the neck of the burner, thus reducing the sensitivity from flame to slow fire to pressure disturbances. Furthermore, because the stability chamber has a relatively large volume, that is, the stability chamber expands radially from the neck of the burner to the flame stability gate, there is a decrease in the tendency for a flame to be extinguished at the respective slow fire when adjusting the fuel / air inlet cup quickly, as well as the large volume of fuel / air inside the flame-absorbing stability chamber.

BRIEF DESCRIPTION OF THE DRAWINGS The features of the invention that are believed to be novel are stipulated with particularity in the appended claims. However, the invention itself, both in terms of the method and the organization of the operation, together with the additional objects and advantages thereof, can be better understood by referring to the following description in conjunction with the accompanying drawings, in which, the like characters represent the same parts throughout all the drawings, and in which: Figure 1 presents a separate view in perspective parts of a gas burner assembly in accordance with this invention. Figure 2 presents a view of a plane in cross section through line 2-2 of Figure 1, in accordance with this invention. Figure 3A shows a fragmented cross-sectional top view of a gas burner assembly in accordance with this invention. Figure 3B presents a view of the cross-sectional plane fragmented through line 3-3 of the gas burner assembly of Figure 3A. Figure 3C presents a view of the cross-sectional plane fragmented through line 4-4 of a gas burner assembly of Figure 3A. Figure 4 presents a separate view in perspective parts of the gas burner assembly according to another embodiment of this invention.

Detailed Description of the Invention The gas burner assembly 10 includes a burner body 12 with a solid trunk-shaped base portion 14 and a cylindrical side wall 16 (Figure 1) extending axially from the periphery of the portion of the burner portion. base 14, as shown in the embodiments illustrated in Figures 1 and 2. A gas main conduit 18 with an inlet area 19 and the neck region of the burner 20 is open towards the exterior of the burner body 12 and defines a Hallway extending axially through the center of the body of the burner 12 to thereby provide the burner assembly 10 with the fuel / air flow along the "A" passage (Figure 2). As used herein, the term "gas" refers to a combustible gas or a gaseous fuel mixture. The burner assembly 10 is attached, in a known manner, to a support surface 21 (Figure 1) of a cooking gas article, such as a cooking pot. A cover 22 is placed on the upper part of the body of the burner 12, defining between these a main annular fuel chamber 24, an annular diffusion region 25 (Figure 2), and a stability chamber 26, with a wedge shape. A toroidal upper portion 27 of the burner body 12, which immediately limits the neck of the burner 20, in combination with the lid 22 defines the annular diffusion region 25 therebetween. The lid 22 can be fixedly attached to the side wall 16 (Figure 1), or it can simply rest on the side wall 16, so that it can be easily removed. While one type of burner was described and illustrated, the present invention can be applied to other types of burners, such as die-cut aluminum burners and separately housed burners. The annular main fuel chamber 24 is defined by an outer surface 28 of the toroidal upper surface 27, by the inner surface 29 of the side wall 26, by an upper surface 30 (Figure 3) of the base portion 14, and by a cover 22. A plurality of primary burner flaps 32 are placed in the side wall 16 (Figure 1) of the burner body 12 to thereby provide a passage to allow liquid communication with the main fuel chamber 24, and each primary burner gate 32 is adapted to support a respective main flame 33 (Figure 2). The primary burner gates 32 are typically, although not necessary, spaced apart in the side wall 16. As used herein, the term "gate" refers to an opening of any shape that can support a flame. At least one slow flame flap 34 is placed on the side wall 16 (Figure 1) of the burner body 12 to thereby provide a passageway to allow liquid communication with the stability chamber 26. The flame gate on a low flame 34 is substantially insulated from the main fuel chamber 24 and is adapted to support a simmer flame 35. The simmer flame flap 34 is adjacent the gates of the primary burner 32 to provide a source of re-ignition for the gate of the primary burner 34 if the flame were extinguished. While nothing else is shown by a slow fire flap 34 in the drawing, the present invention may include one or more additional flame flames 34. Typically, the slow flame gate 34 has an area about five to fifteen times more open than that of the respective primary burner gate 32. A gas supply conduit 36 (Figure 2) comprises a bushing 38 positioned at one end for connection to a gas source 40 via a valve 42 (shown schematically in Figure 2). The valve 42 is controlled in a known manner by a corresponding control button on the cooking gas article, to regulate the gas flow from the gas source 40 to the gas conduit 44. The injection orifice 44 is aligned with the main gas conduit 18 so that the fuel, discarded from the injection port 44, and the air entered, are provided to the main fuel chamber 24 and to the stability chamber 26 via a conduit 18 along the aisle "A" of Figure 2. In accordance with the present invention, as shown in Figures 1 and 2 , the stability chamber 26 is substantially insulated from the main fuel chamber 24, so that the stability chamber 26 is not in direct liquid communication with the main fuel chamber 24, and therefore is relatively independent of the gates of the primary burner 32. The stability chamber 26 is defined on each side by a pair of radially extending deviators 50a and 50b (Figure 1), on the upper and lower surface 46 (Fi Figure 2) of the body of the burner 12, and in the upper part by the lid 22. An end wall 52 which is placed proximate the neck of the burner 20 also defines the stability chamber 26 to thereby substantially isolate the stability chamber. 26 of the main fuel chamber 24. In one embodiment of the present invention, as best shown in Figure 2, the upper surface 46 of the burner body 12 is configured in such a way that the stability chamber 24 has a shallow depth in it. the narrow end of the stability chamber 26, closest to the neck of the burner 20, and a transition to a wider and deeper section when it is closer to the flaming fire door 34. In accordance with one embodiment of the present invention, the stability chamber additionally also comprises two stability input deviators 50a, 50b, so that the stability entries 60a, 60b, are positioned in such a way that so that they are substantially symmetrical on each side of the stability chamber 26 to the proximal end wall 52 and to the neck of the corresponding near burner 20. The stability inlets 60a, 60b are substantially perpendicular to the direction of the gas stream radially outward from the neck of the burner 20 and are tangentially fed to the fuel / air mixture by a static pressure at that location, as further described. ahead. The present invention is not limited to two stability inputs 60a, 60b and may in fact have one or more stability inputs. In accordance with the present invention, the stability inlet (s) 60a, 60b, are positioned in the neck of the burner 20. This arrangement improves the performance of the stability by allowing an inlet of the stability chamber to be used. smaller while retaining sufficient gas stream. Furthermore, the present invention creates a flame size of pleasant and aesthetically reduced stability with higher input levels, in a way that can be better understood by considering the distribution of the static pressure at the head of the burner, as described below. .

In Figures 3A to 3C, P3 represents the static pressure in the environment surrounding the gas burner, typically the atmospheric pressure. The pressure P3 represents the static pressure inside the stability chamber 26, whose pressure is approximately equal to the ambient pressure P3, due in part to the low velocity of the current and the exit area of the stability chamber 26. The pressure P2 represents the pressure in the main fuel chamber 24 between the annular diffusion region 25 and the primary gates of the burner 32. The pressure P2 is higher at the pressure P3 due to the pressure drop between the gates of the primary burner 32 The difference in pressure between P3 and P2 forces the fuel / air stream through the primary flaps of burner 32, and in commercially available chambers (see above, De Gouville et al.), The current is also guided into of the expansion chamber. The pressure Pj is the static pressure at the inlet to the annular diffusion region 25. With low input levels, where the burner speeds are low, the friction between the laminar gas stream and the burner becomes significant, and causes the static pressure Pj is significantly higher at the pressure P2. As a consequence, the pressure drop from Pj to P3 is greater than from P to P3. In one embodiment, the drop in static pressure from Pj to P3 is 40 percent higher than from P2 to P3 during slow fire. As a consequence, during the slow fire, for the same size of the entrance to the stability chamber 26, as compared to commercially available expansion chambers, the flame at low heat 35 is larger, thus improving the stability at low heat. Similarly, for the same level of the gas stream, the stability inputs 60a, 60b, should have a smaller size, thus also improving the relative stability of the commercially available burners, as described above. With higher input levels, the relatively high velocity of the gas stream results in a significant decrease in static pressure, in accordance with known principles of the liquid. As a consequence, with higher input levels, the static pressure Pj is less than P2, where the speed is low even with high burner input levels, due to the large area. In fact, the design of the burner can be manipulated by changing the area of the annular diffusion region 25 to create a static pressure Pj that is lower than the ambient pressure P3. The decrease in static pressure P ^ causes the simmering flame 35 to decrease in size while the gas inlet level is increased, thus allowing the simmering flame 35 to be relatively large in a simmering operation without To be excessively large or unpleasant, with a high level of burner inlet. In operation, a control button is manipulated in the cooking gas article corresponding to the desired gas burner assembly 10, thus causing the valve 42 (Figure 2) to supply fuel to the gas supply conduit 36. The fuel it is discarded by the injection holes 44 and the primary air enters to support the combustion. The fuel / air mixture enters the inlet area 19 of the gas main conduit 18 and flows along the path "A" towards the neck of the burner 20 through the annular diffusion region 25 to the fuel chamber 24, and this in turn provides the burner gates with the fuel / air mixture for the combustion of the main flame 33. In addition the fuel / air mixture is fed tangentially to the burner neck 20 through the stability inlets 60a , 60b towards the slow fire gate 34 for the combustion of the flame at a slow fire 35. If the control button is manipulated towards a position corresponding to an elevated entrance, the fuel / air stream is increased towards the main gas conduit 18 and correspondingly increases towards the main fuel chamber 24, producing larger flames in the primary flaps of the burner 32, thus creating a larger desired flame to Cook. However, the current within the stability chamber 26, due to the low static pressure, as mentioned above, is relatively low and a smaller flame is produced at the slow fire flame gate 34. In the Most commercially available burner assemblies, with high burner inlet level, produce relatively large simmer flames, however, in the present invention a smaller, aesthetic and pleasant flame is produced at slow fire. During operations with high burner input level, the burner assembly 10 is relatively immune to the stability problems due to the speeds and the amount of fuel entering the burner assembly 10. If the control button is manipulated at a corresponding position with a low input level, the stream of the fuel / air mixture decreases within the main gas conduit 18 and decreases correspondingly within the main fuel chamber 24 producing smaller main flames 33 in the main burner gates 32, thus creating smaller desired flames for cooking. The current to the stability chamber 26, however, due to the high static pressure, as described above, is relatively high and the stable slow flame 38 occurs in the flame gate at a slow fire 34. During the operations with a low burner input level, when commercially available burner assemblies, such as those described above, are susceptible to pressure disturbances that propagate through the environment or through the furnace chamber, the stability chamber 26 maintains the flame at stable fire 35, due to a very large pressure drop inside the stability chamber 26. This large drop in pressure within the stability chamber 26 is due to the placement of the upcoming stability entries 60a, 60b to the neck of the burner 20, and to the large volume of the stability chamber 26. In Figure 4 an atmospheric gas burner assembly 110 is seen which is another embodiment of the to present invention. The gas burner assembly 110 is similar in all respects to a gas burner assembly 10, except that the stability chamber 26 comprises a feed pit 112 positioned in the end wall 52 in the neck of the burner 20 of a gas burner. main gas conduit 18 for supplying the gas stream from the gas supply conduit 36 (Figure 2) to the stability chamber 26, to support the flame at a slow fire 35 in the flame gate at a slow simmer 34. The hole 112 replaces the stability inlets 60a, 60b of the burner assembly 10 (Figure 1). The stability chamber 26 extends radially from the feed hole 112 towards the flame gate at a slow fire 34. The current that moves upwards along the corridor "A" and enters the neck of the burner 20 is stopped near the feed pit 112, creating a relatively high local pressure. This local pressure allows the size of the feed pit 112 to be relatively small, thus significantly improving the flame stability of the flame 35. While only certain features of the invention were described and illustrated, many changes and changes will occur. modifications to those skilled in the art. Therefore, it should be understood that the appended claims seek to cover all these modifications and changes as they come within the true spirit of the invention.

Claims (19)

1. CLAIMS 1. A gas burner assembly for connecting to a gas source, this burner assembly comprising: a burner body with a side wall and a main gas line, this main gas line having a burner neck; a plurality of primary burner gates placed in the side walls, - a slow fire flame gate positioned within the side walls with a spacing related to the primary burner gates to provide a re-ignition source, - a fire chamber stability placed inside the body of the burner, this stability chamber being defined on each side by deviators that extend radially on the lower surface by an upper surface of said burner body, on the upper part by a lid, and by the wall end in the neck of the aforementioned burner so as to extend from said neck of the burner towards the gate of the flame at a slow fire; and at least one stability input positioned within at least one of the aforementioned deviators, such that the stability input is substantially perpendicular to the direction of the gas stream that runs radially outward from the burner neck and the inlet of the burner. said stability is placed close to the neck of the burner in order to create a larger flame and a fall in the stabilizing pressure along said stability entrance. A gas burner assembly according to claim 1, wherein the upper surface of said burner body is configured in such a way that the depth of the stability chamber at the end of said stability chamber is as high as possible. as close as possible to said neck of the burner and having a value less than the depth of the stability chamber at the nearest end of the flaming fire door. 3. A gas burner assembly according to claim 1, wherein the stability inlets are positioned substantially symmetrically on each side of the stability chamber proximate the end wall. A gas burner assembly according to claim 1, further comprising a gas supply conduit connected to a gas source by a valve at a first end and comprising an injection orifice at a second end. Said injection orifice is aligned with said gas conduit so that the fuel discarded from the injection orifice and the incoming air are guided towards the gas burner assembly. A gas burner assembly according to claim 1, wherein, with a low burner inlet level, the static pressure at said stability inlets is relatively high, and a relatively large amount of fuel / air mixture it enters the stability chamber, and with a high input level of the burner, the static pressure at said stability inputs is lower, and a smaller amount of fuel / air mixture enters inside said stability chamber. 6. An article for cooking with gas, which comprises: A gas burner assembly for connecting to a gas source, said gas burner assembly comprising a burner body with a side wall and a gas main line, having this gas main conduit a burner neck, a plurality of primary burner gates being positioned within the side wall, a flame flare gate being placed within the side wall adjacent said primary burner gates, thereby providing a re-ignition source, a stability chamber positioned within the body of the heater, the stability chamber is defined on each side by a pair of diverters extending radially at the bottom by an upper surface of said heater body, in the upper part by a cover, and by the end wall in said neck of the heater in such a way to extend from said neck of the heater to said flame gate at low flame, and at least one stability input placed within at least one of said deviators so that said stability input is substantially perpendicular to the direction of the gas stream going radially outwardly from said neck of the burner, this stability inlet being placed proximate the neck of the heater in order to create a Great flame with a stabilizing pressure drop inside said stability input. 7. An article for cooking with gas according to claim 6, wherein said upper surface of the body of the heater is configured such that the depth of the stability chamber at the end of said stability chamber closest to the radiator neck have a value less than the depth of the stability chamber at the end closest to the flame gate at low heat. 8. An article for cooking with gas according to claim 6, wherein said stability entries are positioned substantially symmetrically on each side of said stability chamber proximate said end wall. 9. An article for cooking with gas according to claim 6, further comprising a gas supply conduit that is connected to a gas source by a valve at a first end, and comprised of an injection orifice in a second end, said injection hole being aligned with said main gas conduit so that the fuel discarded from said injection orifice and the incoming air are provided to the gas burner assembly. 10. An article for cooking with gas according to claim 6, wherein, with a low input level of the burner, the static pressure at said stability inlets is relatively high and a large amount of fuel / air mixture enters at said stability chamber, and with a high input level of the burner, the static pressure of said stability inputs is relatively low and a smaller quantity of fuel enters said stability chamber. 11. A gas burner assembly for connecting to a gas source, said gas burner assembly being comprised of: A burner body and a gas main line, said gas main line having a burner neck; A side wall extending between said lid and said body at the periphery of said body; A burner cap, - A plurality of primary burner gates positioned within the side wall; A low flame flame gate positioned within said side wall with a spacing related to said primary burner gates to provide a source of re-ignition; A stability chamber placed inside said burner body, this stability chamber being defined on each side by a pair of deviators that extend radially in the lower part by an upper surface of said heater body, in the upper part by a cover, and by the side wall in said heater neck so as to extend from said heater neck to said flame flare over low heat, - and at least one stability entry placed within at least one of said deviators, so that said stability input is substantially perpendicular to the direction of the gas stream going radially outwardly of said burner neck, the stability inlet being placed proximate said heater neck to create a large flame with a stabilizing pressure drop within said stability input. A gas burner assembly according to claim 11, wherein said top surface of said heater body is configured such that the depth of said stability chamber at the end of said stability chamber closest to said neck of burner has a value less than the depth of the stability chamber at the end closest to said flame gate at low heat. 13. A gas burner assembly according to claim 11, wherein said stability inlets are positioned substantially symmetrically on each side of said stability chamber proximate said end wall. A gas burner assembly according to claim 11, further comprising a gas supply conduit connected to a gas source by a valve at a first end, and comprising an injection orifice at a second end, said injection orifice aligned with said gas conduit so that the fuel discarded from said injection orifice and the incoming air are provided to said gas burner assembly. A gas burner assembly according to claim 11, wherein, with a low burner inlet level, the static pressure of said stability inlets is relatively high and a large amount of fuel / air mixture enters a said stability chamber, and with a high input level of the burner, the static pressure of said stability inputs is relatively low and a smaller amount of fuel / air mixture enters said stability chamber. 16. A gas burner assembly for connecting to a gas source, this gas burner assembly comprising: A burner body with a side wall and a gas main line, and said gas main line having a heater neck, - A plurality of primary burner gates positioned within said side wall; A flaming fire gate positioned within said side wall with a spacing related to the primary burner gates to provide a source of re-ignition, - A stability chamber positioned within said burner body, this stability chamber being defined on each side by a pair of diverters extending radially, in the lower part by an upper surface of said heater body, in the upper part by a lid, and by the end wall in said burner neck so that extends from said burner neck to said flame gate at low flame, - and a feed hole placed within the end wall proximate said heater neck to thereby create a large flame with a stabilizing pressure drop within said feeding hole. 17. A gas burner assembly according to claim 16, wherein said upper surface of said burner body is configured such that the depth of the stability chamber at the end of said depth chamber closest to said heater neck has a value less than the depth of said stability chamber at the end closest to said flame gate at low heat. A gas burner assembly according to claim 16, further comprising a gas supply conduit connected to a gas source by a valve at a first end and comprising an injection orifice at a second end, this being injection hole aligned with said gas main conduit, so that the fuel discarded by the injection orifice and the incoming air, are provided to said gas burner assembly. 19. A gas burner assembly according to claim 16, wherein, with a high burner inlet level, the static pressure of said feed hole is relatively high, and a relatively large amount of fuel / air mixture. it enters the stability chamber, and with a high input level of the burner, the static pressure of said feed hole is relatively low and a smaller amount of fuel / air mixture enters the stability chamber.