Stove burner, gas stove

Abstract

To realize a cooking stove burner (10) and a gas cooking stove (1) of high heat efficiency.SOLUTION: A plurality of main flame holes (21f, 22f) are formed on positions (23b, 24b) where an outer peripheral side surface of a burner head (20) does not face trivet claws (4b), but a vertical recessed groove (20m) is formed for the main burner hole on positions (23a, 24a) facing the trivet claws. Thus, degradation of heat efficiency caused by burning of the trivet claws by flame can be prevented. In addition, flow of air rising in the recessed groove generates in starting the combustion by a cooking stove burner, and by the flow of air, the air is supplied to the flame formed on an end portion of the position not facing the trivet claws. The flame formed on the end portion compensates for a state that sufficient heat cannot be received from adjacent flame, so that a combustion state of a fuel gas is improved, and the heat efficiency can be improved.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a stove burner that is mounted on a gas stove with a trivet placed on the top plate and heats the bottom of a cooking container placed on the trivet, and to a gas stove equipped with a stove burner. [Background technology]

[0002] Gas stoves, which use a gas burner to burn fuel gas and heat and cook food in a cooking container, are widely used. The gas burner (hereinafter referred to as a stove burner) installed in a gas stove has a structure in which a circular burner head is placed on a burner body that mixes fuel gas with air to form a mixed gas, and multiple flame ports are formed on the outer peripheral side of the burner head in a circumferentially arranged manner. The mixed gas formed in the burner body flows out from these flame ports, and the mixed gas flowing out from the multiple flame ports is ignited to combust the fuel gas.

[0003] The stove burner is mounted within the main body case of the gas stove, but a circular opening is formed in the top plate of the gas stove, through which the upper part of the burner body of the stove burner protrudes. Trivets extend from each of the multiple locations surrounding the burner body protruding from the opening toward the burner body. When cooking food, a cooking vessel is placed on these trivets, and fuel gas is burned by the stove burner. However, because such a stove burner heats the bottom of a cooking vessel placed on the trivet by burning fuel gas below the cooking vessel, some of the flame from the combustion burns the trivet instead of the bottom of the cooking vessel, resulting in reduced thermal efficiency.

[0004] Therefore, a stove burner has been proposed in which a normal flame port is not formed on the outer peripheral side of the burner head in the position facing the trivet claw (hereinafter referred to as the opposing outer peripheral side), but only a small flame port for flame transfer (Patent Document 1).In this proposed stove burner, a large flame from a normal flame port is not formed on the opposing outer peripheral side, so the flame does not burn the trivet claw, preventing a decrease in thermal efficiency. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 62-52308 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the conventional stove burners proposed have the problem of difficulty in adequately preventing a decline in thermal efficiency. The reason for this is as follows: First, while no ordinary flame nozzles are formed on the opposing outer peripheral side of the burner head, ordinary flame nozzles are formed on the adjacent outer peripheral side, and fuel gas flows out of these flame nozzles at the same flow rate as the other flame nozzles (referred to here as ordinary flame nozzles). However, since ordinary flame nozzles form flames on both sides, fuel gas can be burned while receiving heat from both flames, whereas the flame formed in the flame nozzle adjacent to the opposing outer peripheral side does not form a flame on the opposing outer peripheral side. As a result, the fuel gas cannot receive sufficient heat from the adjacent flames, which deteriorates the combustion state and reduces thermal efficiency.

[0007] The present invention has been made to solve the above-mentioned problems of the conventional technology, and aims to provide technology that makes it possible to realize a stove burner and gas stove with high thermal efficiency. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the stove burner of the present invention employs the following configuration: A stove burner is mounted on a gas stove with a trivet placed on the top plate, and burns a mixture of fuel gas and air to heat the bottom of a cooking vessel placed on the trivet claws of the trivet. a burner body into which the mixed gas flows; a burner head that is placed on the burner body, receives the mixed gas from the burner body, and burns the mixed gas by discharging the mixed gas from a plurality of main flame ports that open on an outer peripheral side surface formed in a cylindrical surface shape; Equipped with The outer peripheral side surface of the burner head has an opposing outer peripheral side surface that faces the trivet claws when the stove burner is mounted on the gas stove, and a non-opposing outer peripheral side surface that does not face the trivet claws, The main flame port is formed on the non-opposing outer peripheral side surface, not on the opposing outer peripheral side surface, Instead of the main flame port being formed on the opposing outer peripheral side surface, a recessed groove extending in the vertical direction is formed. It is characterized by:

[0009] In the stove burner of this invention, a plurality of main flame ports are formed on the outer peripheral side of the burner head, and by letting the mixed gas flow out from the main flame ports, a flame is formed outside the main flame ports and the mixed gas is burned. Here, the outer peripheral side of the burner head has an opposing outer peripheral side that faces the trivet claws of the trivet when the stove burner is mounted on the gas stove, and a non-opposing outer peripheral side that does not face the trivet claws. The non-opposing outer peripheral side has a main flame port formed thereon, but the opposing outer peripheral side does not have a main flame port formed thereon, and instead has a recessed groove extending in the vertical direction.

[0010] This prevents a main flame port from being formed on the opposing outer peripheral side facing the trivet claws, preventing the flame from burning the trivet claws and reducing thermal efficiency. Furthermore, because no flame is formed on the opposing outer peripheral side, flames formed on the non-opposing outer peripheral side adjacent to the opposing outer peripheral side can only receive heat from one side. However, because the opposing outer peripheral side has a groove extending vertically, when fuel gas is burned with the stove burner, an air flow rises through the groove, and this air flow provides sufficient air to the flame adjacent to the opposing outer peripheral side. This compensates for the fact that the flame heat can only be received from one side, improving the combustion state of the fuel gas and thereby improving thermal efficiency.

[0011] In the stove burner of the present invention, the grooves may penetrate the upper surface of the burner head. The peripheral edge of the upper surface of the burner head may be raised between the portion of the periphery of the upper surface through which the groove penetrates and the portion through which the adjacent groove penetrates, thereby forming a circumferentially continuous raised portion, and the raised portion may be interrupted at the portion of the periphery of the upper surface of the burner head through which the groove penetrates, thereby forming a notched portion.

[0012] In this way, even if spilled liquid gets on the top surface of the burner head, it cannot go over the raised part and will instead flow down the recessed part into the groove, preventing the main flame port from being blocked by spilled liquid.

[0013] In the stove burner of the present invention described above, the burner head may be separable into a lower burner head and an upper burner head. When the lower burner head is placed on the burner body, a plurality of small flame ports smaller than the main flame port are formed around the entire circumference between the burner body and the lower burner head, and when the upper burner head is placed on the lower burner head, a plurality of main flame ports are formed on the non-opposing outer peripheral side surface and a recessed groove is formed on the opposing outer peripheral side surface.

[0014] The main flame port generates a large flame, which could potentially burn the trivet claws and reduce thermal efficiency, but the small flame port generates only a small flame, which does not cause the flame to burn the trivet claws and reduce thermal efficiency. Therefore, if small flame ports are formed around the entire circumference between the burner body and the lower burner head, multiple small flame ports can be formed, which increases the range of heat available for cooking using only the small flame ports. On the other hand, by forming the main flame port on the non-facing outer peripheral side and forming a groove on the facing outer peripheral side, thermal efficiency can be improved when cooking using the main flame port.

[0015] Furthermore, in the stove burner of the present invention, in which the burner head can be divided into a lower burner head and an upper burner head, the lower burner head and the upper burner head may be shaped as follows: First, the lower burner head has a cylindrical bottom cylindrical wall protruding downward from the outer periphery of the bottom surface, and a cylindrical lower cylindrical wall protruding upward from the outer periphery of the top surface. The upper burner head has a cylindrical upper cylindrical wall protruding downward from the outer periphery of the bottom surface. The lower end surface of the bottom cylindrical wall is formed with a plurality of small flame port grooves that will form small flame ports when the lower burner head is placed on the burner body. Furthermore, the lower cylindrical wall is formed with a plurality of lower main flame port grooves that will form main flame ports when the upper burner head is placed on it, at the upper end surface of the portion of the outer periphery that corresponds to the non-opposing outer periphery, and a recessed groove is formed in the outer periphery where the outer periphery corresponds to the non-opposing outer periphery. Furthermore, the upper cylindrical wall may have a plurality of lower main flame port grooves formed on the lower end surface of the portion where the outer peripheral side surface corresponds to the non-opposing outer peripheral side surface, which will form a main flame port when placed on the lower burner head, and in the portion where the outer peripheral side surface corresponds to the non-opposing outer peripheral side surface, a recessed groove may be formed on the outer peripheral side surface.

[0016] In stove burners where the burner head can be separated into an upper burner head and a lower burner head, and where the upper burner head is placed on top of the lower burner head to form multiple main flame ports on the outer peripheral side of the upper burner head and the lower burner head, if the main flame ports become blocked by overflow, a great deal of effort is required to remove the overflow. However, if a groove is formed on the outer peripheral side, the overflow flows down the groove, preventing the main flame ports from being blocked, and reducing the effort required to remove the overflow.

[0017] Furthermore, in the stove burner of the present invention, in which the burner head can be divided into a lower burner head and an upper burner head, the spacing between the multiple small flame ports may be set so that when a flame is formed in one small flame port, the flame spreads to the adjacent small flame port. Also, the spacing between the multiple main flame ports and the small flame ports may be set so that when a flame is formed in a small flame port, the flame spreads to the main flame port above the small flame port. The stove burner may also be provided with an ignition means for igniting some of the multiple small flame ports, and a flame detection means for detecting flames formed in small flame ports other than the small flame ports ignited by the ignition means.

[0018] In this way, simply igniting some of the multiple small flame ports allows the flame generated in that small flame port to spread to all the small flame ports, starting combustion. Since the flame can spread to all the small flame ports, detecting a flame in any small flame port other than the one ignited by the ignition means makes it possible to confirm that ignition was successful and combustion has started. Furthermore, since the flame spreads to the main flame port from the flame in the lower small flame port, once combustion has started in all the small flame ports, the flame can spread to all the main flame ports. Therefore, there is no need to provide an ignition means or flame detection means for the main flame port. Additionally, since the outer peripheral side of the burner head has a groove extending vertically on the opposite outer peripheral side, even if overflow occurs, the overflow flows down the groove and reaches the burner body. For this reason, when overflow occurs, the small flame nozzles are more likely to become blocked than the main flame nozzles, and as a result, by detecting the flame in the small flame nozzles, it is possible to detect that a flame nozzle has become blocked due to overflow (even without detecting the flame in the main flame nozzle).

[0019] Furthermore, the stove burner of the present invention may be mounted on a gas stove, and the bottom of a cooking vessel placed on the trivet may be heated by burning a mixed gas in the stove burner.

[0020] This makes it possible to realize a gas stove with good thermal efficiency. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a perspective view showing the external shape of a gas stove 1 equipped with a stove burner 10 of this embodiment. [Figure 2] 1 is a perspective view showing the general shape of a stove burner 10 according to the present embodiment. [Figure 3] 1 is an exploded view showing the internal structure of the burner body 11b and burner head 20 of the stove burner 10 of this embodiment. [Figure 4] 1 is an explanatory diagram showing the detailed shapes of the bottom cylindrical wall 22b and the lower cylindrical wall 22d by cutting the peripheral edge portion of the lower burner head 22 in the vertical direction. [Figure 5] 2 is an explanatory diagram showing the detailed shape of the upper cylindrical wall 21a by cutting the peripheral portion of the upper burner head 21 in the vertical direction. FIG. [Figure 6] 10 is an explanatory diagram showing the positional relationship between recessed grooves 21m, 22m formed in the upper burner head 21 and the lower burner head 22 and the trivet claws 4b of the trivet 4. FIG. [Figure 7] 1 is an explanatory diagram showing a state in which fuel gas is burned in a conventional upper burner head 91 and a lower burner head 92. FIG. [Figure 8] 2 is an explanatory diagram showing how fuel gas is burned in the upper burner head 21 and the lower burner head 22 of this embodiment. FIG. [Figure 9] 1 is an explanatory diagram of a stove burner 10 in which a raised portion 26 is formed on the peripheral edge portion of the upper surface 21c of the upper burner head 21. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0022] Fig. 1 is a perspective view showing the external shape of a gas stove 1 equipped with a stove burner 10 of this embodiment. The gas stove 1 shown in Fig. 1 is a built-in type gas stove that is fitted into the countertop of a system kitchen (not shown), and includes a box-shaped main body case 2 with an open top and a top plate 3 that is installed to cover the top surface of the main body case 2.

[0023] The main body case 2 houses two burners 10, each consisting of a main burner and a sub burner (described later) arranged vertically. The tops of these burners 10 protrude from insertion holes formed in the top plate 3. A trivet 4 is installed where the burners 10 protrude from the top plate 3. The trivet 4 includes a metal trivet ring 4a with a circular shape and multiple trivet claws 4b extending from the trivet ring 4a. The trivet ring 4a is installed so as to surround the burners 10 protruding from the top plate 3 (so that the burners 10 are inside the trivet ring 4a). Trivet claws 4b extend from multiple points (six points in the illustrated example) on the trivet ring 4a toward the burners 10. Therefore, by placing a cooking vessel such as a pot on the trivet claws 4b, the cooking vessel can be heated from below by the burner 10.

[0024] Furthermore, a temperature sensor 5 is built into the stove burner 10, penetrating the center. The temperature sensor 5 is biased upward by a biasing spring (not shown), so that the top of the temperature sensor 5 protrudes from the center of the top surface of the stove burner 10. When a cooking container is placed on the trivet 4, the bottom of the cooking container presses down on the temperature sensor 5, causing the top end of the temperature sensor 5 to abut against the bottom surface of the cooking container, making it possible to detect the temperature of the cooking container.

[0025] A grill door 7 is provided on the front of the gas stove 1, and a grill compartment and grill burners (not shown) are mounted behind the grill door 7. Two stove operation buttons 8 are provided on the right side of the grill door 7, corresponding to two stove burners 10, and the user of the gas stove 1 can ignite, extinguish, or adjust the heat of the corresponding stove burner 10 by operating one of the stove operation buttons 8. A grill operation button 9 is provided on the left side of the grill door 7, and the user can ignite, extinguish, or adjust the heat of the grill burner by operating the grill operation button 9.

[0026] FIG. 2 is a perspective view showing the general shape of the stove burner 10 of this embodiment. As shown in the figure, the stove burner 10 includes a burner main body 11 formed by combining sheet metal members and a substantially cylindrical burner head 20. The burner main body 11 includes a substantially cylindrical burner body 11b, a main mixing tube 12 connected to the burner body 11b, and a sub-mixing tube 13 with a smaller diameter than the main mixing tube 12 and connected to the burner body 11b. The burner head 20 is placed on the burner body 11b. Furthermore, an insertion hole 20h is formed in the center of the burner head 20, and the temperature sensor 5 described above with reference to FIG. 1 is inserted into this insertion hole 20h.

[0027] The burner head 20 is a member divided into upper and lower two sections, and is formed by casting or die-casting using aluminum alloy or brass. Hereinafter, the upper member constituting the burner head 20 will be referred to as the upper burner head 21, and the lower member will be referred to as the lower burner head 22. When the upper burner head 21 is placed on the lower burner head 22 as shown in the figure, as shown enlarged in Figure 2, a plurality of upper main flame ports 21f are formed on the outer peripheral side surface of the upper burner head 21, and a plurality of lower main flame ports 22f are formed on the outer peripheral side surface of the lower burner head 22. The upper burner head 21 and the lower burner head 22 are combined in such a way that the upper main flame ports 21f and the lower main flame ports 22f are alternately positioned.

[0028] Furthermore, in the stove burner 10 of this embodiment, there are portions in which grooves 21m are formed in place of the upper main flame ports 21f at multiple locations on the outer peripheral side surface of the upper burner head 21, and there are also portions in which grooves 22m are formed in place of the lower main flame ports 22f at multiple locations on the outer peripheral side surface of the lower burner head 22. When the upper burner head 21 is placed on the lower burner head 22, the grooves 22m and 21m are connected vertically to form an integrated groove 20m. The reason for the formation of such grooves 20m will be explained in detail later.

[0029] Furthermore, when the burner head 20 is placed on the burner body 11b, a plurality of small flame ports (hereinafter referred to as small flame ports 22u) are formed between the lower burner head 22 and the burner body 11b. As will be described later, a space to which the main mixing tube 12 is connected and a space to which the sub-mixing tubes 13 are connected are formed inside the burner body 11b. The small flame ports 22u formed between the lower burner head 22 and the burner body 11b are connected to the space to which the sub-mixing tubes 13 are connected. Furthermore, the upper main flame port 21f formed in the upper burner head 21 and the lower main flame port 22f formed in the lower burner head 22 are connected to the space to which the main mixing tube 12 is connected. Therefore, as will be described later, when fuel gas is supplied to the sub-mixing tube 13, the fuel gas flows out from the small flame ports 22u, and when fuel gas is supplied to the main mixing tube 12, the fuel gas flows out from the upper main flame port 21f and the lower main flame port 22f. The upper main flame port 21f and the lower main flame port 22f of this embodiment correspond to the "main flame port" of the present invention.

[0030] Fuel gas is supplied to the main mixing tube 12 and the sub-mixing tube 13 as follows. First, the main mixing tube 12 has an open end 12o on the side not connected to the burner body 11b, and the sub-mixing tube 13 also has an open end 13o on the side not connected to the burner body 11b. A gas injection nozzle 43p is provided at a position facing the open end 12o of the main mixing tube 12, and a gas injection nozzle 43c is provided at a position facing the open end 13o of the sub-mixing tube 13. Note that, hereinafter, the gas injection nozzle 43p provided on the main mixing tube 12 side may be referred to as the "main-side gas injection nozzle 43p," and the gas injection nozzle 43c provided on the sub-mixing tube 13 side may be referred to as the "sub-side gas injection nozzle 43c." A connecting pipe 40p is connected to the main-side gas injection nozzle 43p, and a connecting pipe 40c is connected to the sub-side gas injection nozzle 43c. These two connecting pipes 40p and 40c branch off from the gas supply pipe 40.

[0031] When fuel gas is supplied to the gas supply pipe 40, the fuel gas branches into the connecting pipe 40p and the connecting pipe 40c and is supplied to the parent-side gas injection nozzle 43p and the child-side gas injection nozzle 43c. The fuel gas is then injected from a nozzle hole 44p formed at the tip of the parent-side gas injection nozzle 43p toward the open end 12o of the parent mixing tube 12. The injected fuel gas flows into the parent mixing tube 12 while drawing in ambient air due to the ejector effect, mixes with the air inside the parent mixing tube 12, and then flows out from the upper main flame port 21f and the lower main flame port 22f. Similarly, fuel gas is also injected from a nozzle hole 44c formed at the tip of the child-side gas injection nozzle 43c toward the open end 13o of the child mixing tube 13. The injected fuel gas flows into the child mixing tube 13 while drawing in ambient air due to the ejector effect, mixes with the air inside the child mixing tube 13, and then flows out from the child flame port 22u.

[0032] Here, the nozzle holes 44p formed in the parent-side gas injection nozzle 43p are set to have a larger diameter than the nozzle holes 44c formed in the child-side gas injection nozzle 43c. Therefore, the parent-side gas injection nozzle 43p is able to inject a larger amount of fuel gas than the child-side gas injection nozzle 43c. Corresponding to this, the parent mixing tube 12 is formed with a larger diameter than the child mixing tube 13. A gas flow rate control valve 41 for adjusting the flow rate of the fuel gas is attached to the gas supply pipe 40. Furthermore, an opening / closing valve 42 for opening and closing the connecting pipe 40p is attached to the connecting pipe 40p that supplies fuel gas to the parent mixing tube 12.

[0033] The burner main body 11 is also provided with an ignition plug 30 and a flame sensor 32 near the outer peripheral surface of the burner body 11b. Furthermore, an ignition target 31 protrudes from the outer peripheral surface of the burner head 20 above the ignition plug 30. With the on-off valve 42 fully closed, a spark is discharged from the ignition plug 30 toward the ignition target 31. When the gas flow control valve 41 is opened, fuel gas flows out from the small flame ports 22u, ignites, and combustion begins. The spacing between adjacent small flame ports 22u is set so that when a flame is formed in one small flame port 22u, that flame also forms a flame in the adjacent small flame port 22u. Therefore, when combustion begins in the small flame port 22u near the ignition plug 30, the flame spreads to the adjacent small flame ports 22u one after another, and as a result, fuel gas combustion begins in all of the small flame ports 22u. Flame sensor 32 can detect the flame generated in small flame nozzle 22u. When on-off valve 42 is opened while a flame is formed in small flame nozzle 22u, fuel gas also flows out from upper main flame nozzle 21f and lower main flame nozzle 22f. The distance between small flame nozzle 22u and lower main flame nozzle 22f above it is set so that when a flame is formed in small flame nozzle 22u, that flame also forms a flame in lower main flame nozzle 22f above it. Therefore, the flame in small flame nozzle 22u starts combustion of fuel gas in lower main flame nozzle 22f and upper main flame nozzle 21f as well.

[0034] Furthermore, the stove burner 10 of this embodiment is equipped with a spark plug 30 for igniting the fuel gas flowing out from the small flame nozzle 22u, but is not equipped with a spark plug for igniting the fuel gas flowing out from the lower main flame nozzle 22f or the upper main flame nozzle 21f. The reason for this is as follows: As described above with reference to FIG. 2, the upper main flame nozzle 21f and the lower main flame nozzle 22f have larger opening areas than the small flame nozzle 22u. Furthermore, the main mixing tube 12, which communicates with the upper main flame nozzle 21f and the lower main flame nozzle 22f inside the burner body 11, has a larger diameter than the sub-mixing tube 13, which communicates with the small flame nozzle 22u. Furthermore, the gas injection nozzle 43p can inject a larger amount of fuel gas than the gas injection nozzle 43c. Therefore, the upper main flame nozzle 21f and the lower main flame nozzle 22f can combust a larger amount of fuel gas than the small flame nozzle 22u, generating a large amount of heat. For this reason, the stove burner 10 burns fuel gas in the small flame nozzle 22u while the required heat output is low, and then burns fuel gas in the upper main flame nozzle 21f and the lower main flame nozzle 22f when high heat output is required. When returning to low heat output, combustion in the small flame nozzle 22u continues, but combustion in the upper main flame nozzle 21f and the lower main flame nozzle 22f is terminated. In this manner, in the stove burner 10 of this embodiment, when combustion in the upper main flame nozzle 21f and the lower main flame nozzle 22f begins, fuel gas is always burning in the small flame nozzle 22u. Therefore, if the spark plug 30 can ignite the fuel gas flowing out of the small flame nozzle 22u, the flame from the small flame nozzle 22u can spread, thereby starting combustion in the lower main flame nozzle 22f and the upper main flame nozzle 21f. For this reason, if an ignition plug 30 that ignites the small flame nozzle 22u is installed, there is no need to install an ignition plug that ignites the lower main flame nozzle 22f or the upper main flame nozzle 21f.

[0035] 3 is an exploded view showing the internal structure of the burner body 11b and burner head 20 of the stove burner 10 of this embodiment. As shown in the figure, the upper end of the approximately cylindrical burner body 11b is bent inward to form an annular mounting surface 11a on which the burner head 20 is mounted. A cylindrical central cylinder 14 is erected inside the burner body 11b, and an annular mixing chamber 16 into which mixed gas is supplied is formed between the burner body 11b and the central cylinder 14.

[0036] Furthermore, a substantially cylindrical partition cylinder 15 is provided between the burner body 11b and the central cylinder 14, and this partition cylinder 15 divides the mixing chamber 16 into a space inside the partition cylinder 15 and a space outside the partition cylinder 15. The space inside the partition cylinder 15 becomes a main mixing chamber 16p, which will be described later, and the space outside the partition cylinder 15 becomes a sub mixing chamber 16c, which will be described later. The partition cylinder 15 is formed from a sheet metal member, just like the burner body 11b, and after the upper end of the cylindrical shape is bent inward, the inner edge of the bent portion is bent downward to form a short cylindrical fitting surface 15a.

[0037] As described above, the burner head 20 is formed of the upper burner head 21 and the lower burner head 22. The lower burner head 22 is placed on the mounting surface 11a of the burner body 11b, and the upper burner head 21 is placed on the lower burner head 22. As shown in the figure, the lower burner head 22 is a substantially annular member, and a cylindrical partition wall 22a extends downward from the inner edge. A cylindrical bottom cylindrical wall 22b, which is shorter than the partition wall 22a, extends downward from the bottom side of the peripheral edge of the lower burner head 22. A plurality of small flame grooves 22c are drilled upward, radially from the center of the lower burner head 22, on the lower end surface of the bottom cylindrical wall 22b (the surface that abuts against the mounting surface 11a of the burner body 11b) (see FIG. 4, described later). Furthermore, a cylindrical lower cylindrical wall 22d, which is longer than the bottom cylindrical wall 22b, stands upward from the upper surface of the peripheral portion of the lower burner head 22, and a plurality of lower main flame port grooves 22e are drilled radially downward from the center of the lower cylindrical wall 22d on the upper end surface of the lower cylindrical wall 22d (see Figure 4 described below).

[0038] 4 is an explanatory diagram showing the detailed shapes of the bottom cylindrical wall 22b and the lower cylindrical wall 22d by cutting the peripheral portion of the lower burner head 22 vertically. The cut position indicated by AA in FIG. 4(a) is a cut position where the small flame grooves 22c and the lower main flame grooves 22e are not formed, and the cut position indicated by BB in FIG. 4(a) is a cut position where the small flame grooves 22c and the lower main flame grooves 22e are formed. The cut position indicated by CC in FIG. 4(a) will be described later.

[0039] Figure 4(b) shows a cross-sectional view obtained when the peripheral portion of the lower burner head 22 is cut at the position AA in Figure 4(a). As shown in the figure, a bottom-side cylindrical wall 22b is formed downward from the peripheral portion of the lower burner head 22, and a lower-side cylindrical wall 22d is formed upward. Figure 4(c) shows a cross-sectional view obtained when the peripheral portion of the lower burner head 22 is cut at the position BB in Figure 4(a). As shown in the figure, a small flame port groove 22c is drilled in the bottom-side cylindrical wall 22b from the bottom side upward, and the small flame port groove 22c penetrates to the outer peripheral side surface 25 of the bottom-side cylindrical wall 22b (see Figure 4(b)). Therefore, when the lower burner head 22 is placed on the mounting surface 11a of the burner body 11b, the bottom surface of the small flame port groove 22c that penetrates the outer peripheral side surface 25 of the bottom side cylindrical wall 22b is blocked by the mounting surface 11a, thereby forming a small flame port 22u (see Figure 2) that opens on the outer peripheral side surface 25 of the bottom side cylindrical wall 22b.

[0040] As shown in FIG. 4(c), lower main flame port grooves 22e are formed in the lower cylindrical wall 22d from the upper end surface downward, and the lower main flame port grooves 22e penetrate to the outer peripheral side surface 24 of the lower cylindrical wall 22d (see FIG. 4(b)). As shown in FIG. 4(a), multiple lower main flame port grooves 22e are formed at equal intervals in the lower cylindrical wall 22d of the lower burner head 22, but there are multiple locations where no lower main flame port grooves 22e are formed. In the locations where no lower main flame port grooves 22e are formed, recessed grooves 22m are formed in the outer peripheral side surface 24 of the lower cylindrical wall 22d. The cut position indicated by CC in FIG. 4(a) is the cut position where the recessed grooves 22m are formed. FIG. 4(d) shows a cross-sectional view obtained when cutting the peripheral portion of the lower burner head 22 at the CC position in FIG. 4(a). As shown in the figure, the groove 22m formed on the outer peripheral side surface 24 of the lower cylindrical wall 22d does not penetrate the lower burner head 22 at its lower end, but the upper end of the groove 22m penetrates to the upper end surface of the lower cylindrical wall 22d.

[0041] Furthermore, as shown in FIG. 3, an ignition target 31 protrudes from the outer peripheral side surface 24 (see FIG. 4(b)) of the lower cylindrical wall 22d of the lower burner head 22 to a position above the above-mentioned ignition plug 30.

[0042] The shape of the lower burner head 22 has been described above, but the upper burner head 21 is placed on the lower burner head 22. As shown in Fig. 3, the upper burner head 21 is formed in an annular shape, with a cylindrical inner tube (not shown) extending downward from the inner edge. Furthermore, a cylindrical upper cylindrical wall 21a is provided extending downward from the peripheral edge, and a plurality of upper main flame port grooves 21b are formed in the lower end surface of the upper cylindrical wall 21a radially from the center of the upper cylindrical wall 21a (see Fig. 5 described later).

[0043] 5 is an explanatory diagram showing the detailed shape of the upper cylindrical wall 21a by cutting the peripheral portion of the upper burner head 21 in the vertical direction. The cut position indicated by DD in FIG. 5(a) is the cut position where the upper main flame groove 21b is not formed, and the cut position indicated by EE in FIG. 5(a) is the cut position where the upper main flame groove 21b is formed. The cut position indicated by FF in FIG. 5(a) will be described later.

[0044] Figure 5(b) shows a cross-sectional view obtained when cutting the peripheral portion of the upper burner head 21 at position DD in Figure 5(a). As shown in the figure, an upper cylindrical wall 21a is formed extending downward from the peripheral portion of the upper burner head 21. Figure 5(c) shows a cross-sectional view obtained when cutting the peripheral portion of the upper burner head 21 at position EE in Figure 5(a). As shown in the figure, an upper main flame port groove 21b is drilled in the upper cylindrical wall 21a extending upward from the lower end surface, and the upper main flame port groove 21b penetrates to the outer peripheral side surface 23 (see Figure 5(b)) of the upper cylindrical wall 21a.

[0045] As shown in FIG. 5(a), the upper cylindrical wall 21a of the upper burner head 21 also has a plurality of upper main flame port grooves 21b formed at equal intervals. However, there are a plurality of locations where the upper main flame port grooves 21b are not formed. In these locations, grooves 21m are formed in the outer peripheral side surface 23 of the upper cylindrical wall 21a. The cut position indicated by FF in FIG. 5(a) is the cut position where the grooves 21m are formed. FIG. 5(d) shows a cross-sectional view obtained when the peripheral portion of the upper burner head 21 is cut at the position indicated by FF in FIG. 5(a). As shown in the figure, the grooves 21m formed in the outer peripheral side surface 23 of the upper cylindrical wall 21a penetrate the upper cylindrical wall 21a in the vertical direction, opening at the lower end surface of the upper cylindrical wall 21a and the upper surface 21c of the upper burner head 21.

[0046] The burner head 20 is formed by placing the upper burner head 21 having the above-mentioned shape on the lower burner head 22, but when placing the upper burner head 21 on the lower burner head 22, it is placed in a state where it is positioned so that the upper main flame port groove 21b of the upper burner head 21 does not overlap with the lower main flame port groove 22e of the lower burner head 22. Therefore, the upper surface of the lower main flame port groove 22e drilled in the upper end surface of the lower cylindrical wall 22d of the lower burner head 22 is blocked by the lower end surface of the upper cylindrical wall 21a of the upper burner head 21, and as a result, a lower main flame port 22f (see FIG. 2) is formed at the location where the lower main flame port groove 22e opens on the outer peripheral side surface 24 of the lower cylindrical wall 22d. Furthermore, the bottom surface of bottom-side cylindrical wall 22b, which is drilled on the lower end surface of upper cylindrical wall 21a of upper burner head 21, is closed by the upper end surface of lower cylindrical wall 22d of lower burner head 22, and upper main flame port 21f (see FIG. 2) is formed at the location where upper main flame port groove 21b opens on outer peripheral side surface 23 of upper cylindrical wall 21a. As a result, upper main flame port 21f and lower main flame port 22f are formed in alternate positions (i.e., shifted in the circumferential direction) as shown in FIG. 2. Furthermore, groove 21m formed on outer peripheral side surface 23 of upper burner head 21 and groove 22m formed on outer peripheral side surface 24 of lower burner head 22 are connected vertically to form groove 20m (see FIG. 2).

[0047] 3, when the burner head 20 is placed on the burner body 11b, the partition cylinder 22a suspended downward from the inner edge of the lower burner head 22 is inserted inside the fitting surface 15a of the partition cylinder 15, and the inner cylinder (not shown) suspended downward from the inner edge of the upper burner head 21 is inserted inside the central cylinder 14, while the burner head 20 is lowered. Then, the lower main flame port groove 22e protruding downward from the peripheral edge of the lower burner head 22 comes into contact with the mounting surface 11a of the burner body 11b, and the burner head 20 is placed on the burner body 11b.

[0048] When the burner head 20 is placed on the burner body 11b, the partition cylinder 22a of the lower burner head 22 is fitted into the fitting surface 15a of the partition cylinder 15, and the inner cylinder (not shown) of the upper burner head 21 is fitted into the inner circumferential surface of the upper part of the central cylinder 14. As a result, a sub-mixing chamber 16c is formed outside the partition cylinder 15, surrounded by the partition cylinder 15, the burner body 11b, and the lower burner head 22. This sub-mixing chamber 16c is in communication with the sub-mixing tube 13. Furthermore, a primary mixing chamber 16p is formed inside the partition cylinder 15, surrounded by the central cylinder 14, the partition cylinder 15, the partition cylinder 22a, and the upper burner head 21. This primary mixing chamber 16p is in communication with the primary mixing tube 12.

[0049] In the stove burner 10 of this embodiment, when the required heating power is low, the connecting pipe 40p is closed using the on-off valve 42 (see FIG. 2), thereby burning fuel gas in the small flame nozzle 22u. When the required heating power increases, the on-off valve 42 is fully opened, thereby burning fuel gas in the upper main flame nozzle 21f and the lower main flame nozzle 22f. This configuration allows for a wide range of heating power, from low to high. As described above with reference to FIGS. 3 and 4, the outer peripheral side surface 24 of the lower burner head 22 includes a portion where multiple lower main flame nozzle grooves 22e are formed at equal intervals, and a portion where recessed grooves 22m are formed instead of the lower main flame nozzle grooves 22e. Similarly, the outer peripheral side surface 23 of the upper burner head 21 includes a portion where multiple upper main flame nozzle grooves 21b are formed at equal intervals, and a portion where recessed grooves 21m are formed instead of the upper main flame nozzle grooves 21b, as shown in FIGS. 3 and 5. Here, the position where the groove 22m is formed on the outer peripheral side surface 24 of the lower burner head 22 and the position where the groove 21m is formed on the outer peripheral side surface 23 of the upper burner head 21 are determined by their positional relationship with the trivet claws 4b of the trivet 4.

[0050] FIG. 6 is an explanatory diagram showing the positional relationship between the grooves 21m formed in the outer peripheral side surface 23 of the upper burner head 21 and the grooves 22m formed in the outer peripheral side surface 24 of the lower burner head 22 and the trivet claws 4b of the trivet 4, as viewed from above (in the direction of arrow P in FIG. 1) of the stove burner 10 of this embodiment. The trivet ring 4a of the trivet 4 is installed at positions outside the upper burner head 21 and the lower burner head 22, and the trivet claws 4b extend from multiple equally spaced locations (six locations in the illustrated example) on the trivet ring 4a toward the upper burner head 21 and the lower burner head 22. Therefore, the outer peripheral side surface 24 of the lower burner head 22 faces the trivet claws 4b at multiple locations (six locations in the illustrated example). Hereinafter, the portions of the outer peripheral side surface 24 of the lower burner head 22 facing the trivet claws 4b will be referred to as the "opposing outer peripheral side surface 24a." The recessed groove 22m of the lower burner head 22 is formed on the opposing outer peripheral side surface 24a. Furthermore, the portion of the outer peripheral side surface 24 of the lower burner head 22 other than the opposing outer peripheral side surface 24a (i.e., the portion not facing the trivet claw 4b) is referred to as the "non-opposing outer peripheral side surface 24b." The lower main flame port groove 22e of the lower burner head 22 is formed at a position that opens into the non-opposing outer peripheral side surface 24b. Furthermore, an ignition target 31 is protruded from one of the six opposing outer peripheral side surfaces 24a in place of the recessed groove 22m.

[0051] Similarly, the outer peripheral side surface 23 of the upper burner head 21 has an opposing outer peripheral side surface 23a and a non-opposing outer peripheral side surface 23b. That is, of the outer peripheral side surface 23 of the upper burner head 21, the portion facing the trivet claw 4b is the "opposing outer peripheral side surface 23a," and the other portion (i.e., the portion not facing the trivet claw 4b) is the "non-opposing outer peripheral side surface 23b." The recessed groove 21m of the upper burner head 21 is formed in the opposing outer peripheral side surface 23a. Furthermore, the upper main flame port groove 21b of the upper burner head 21 is formed at a position that opens into the non-opposing outer peripheral side surface 23b. When the upper burner head 21 is placed on the lower burner head 22, the opposing outer peripheral side surface 24a of the lower burner head 22 and the opposing outer peripheral side surface 23a of the upper burner head 21 are aligned vertically, and accordingly, the recessed grooves 22m of the lower burner head 22 and the recessed grooves 21m of the upper burner head 21 are also aligned vertically (see FIG. 2). Note that an ignition target 31 is protruding from one of the opposing outer peripheral side surfaces 24a of the lower burner head 22 instead of the recessed groove 22m, but the recessed groove 21m is not formed on the opposing outer peripheral side surface 23a of the upper burner head 21 located above this opposing outer peripheral side surface 24a (the opposing outer peripheral side surface 24a from which the ignition target 31 is protruding).

[0052] In the stove burner 10 of this embodiment, the reason why the recessed grooves 21m, 22m are formed in the upper burner head 21 and the lower burner head 22 is to improve the combustion state of the fuel gas in the upper burner head 21 and the lower burner head 22. As a prelude to explaining the reason for this, we will explain why the combustion state of the fuel gas deteriorates in the conventional upper burner head 91 and lower burner head 92 in which the recessed grooves 21m, 22m are not formed in the upper burner head 21 and the lower burner head 22.

[0053] 7 shows the combustion of fuel gas in conventional upper burner heads 91 and lower burner heads 92, as viewed from above the upper burner heads 91 and lower burner heads 92. The conventional upper burner head 91 differs from the upper burner head 21 of this embodiment described above with reference to FIG. 5 in that the grooves 21m are not formed in the outer peripheral side surface 23, but is otherwise similar to the upper burner head 21 of this embodiment. The conventional lower burner head 92 differs from the lower burner head 22 of this embodiment described above with reference to FIG. 4 in that the grooves 22m are not formed in the outer peripheral side surface 24, but is otherwise similar to the lower burner head 22 of this embodiment. Therefore, detailed description of the conventional upper burner head 91 and lower burner head 92 will be omitted. In addition, the outer peripheral side surfaces of the upper burner head 91 and the lower burner head 92 will be numbered outer peripheral side surface 93 and outer peripheral side surface 94, respectively, the opposing outer peripheral side surfaces of the upper burner head 91 and the lower burner head 92 will be numbered opposing outer peripheral side surface 93a and opposing outer peripheral side surface 94a, respectively, and the non-opposing outer peripheral side surfaces of the upper burner head 91 and the lower burner head 92 will be numbered non-opposing outer peripheral side surface 93b and non-opposing outer peripheral side surface 94b, respectively.

[0054] 7, the flame resulting from the combustion of fuel gas on the outer peripheral side surface 93 of the upper burner head 91 is shown by a solid line, and the flame resulting from the combustion of fuel gas on the outer peripheral side surface 94 of the lower burner head 92 is shown by a dashed line. As with the upper burner head 21 and the lower burner head 22 of this embodiment described above with reference to FIGS. 4 and 5, in the conventional upper burner head 91 and lower burner head 92, the flame resulting from the combustion of fuel gas is formed on the non-opposing outer peripheral side surfaces 93b, 94b, and no flame is formed on the opposing outer peripheral side surfaces 93a, 94a. For this reason, the flame formed at the boundary between the opposing outer peripheral side surfaces 93a, 94a (the flame indicated by diagonal lines in the figure) is formed only on one side, and therefore cannot fully receive the heat of the flame burning next to it. In particular, when the set heat output is small and the flames formed at the main flame ports (upper main flame port 21f of the upper burner head 21 and lower main flame port 22f of the lower burner head 22) are small, the heat received from the adjacent flames is reduced, making it difficult to maintain a good combustion state of the fuel gas.

[0055] In addition, at the set heating power where such a small flame is formed, the flow rate of the fuel gas injected from the parent-side gas injection nozzle 43p toward the open end 12o of the parent mixing tube 12 is small, so a sufficient ejector effect cannot be obtained and there is a slight shortage of air flowing into the parent mixing tube 12. As a result, the mixed gas obtained by mixing the fuel gas and air inside the parent mixing tube 12 has a relatively high concentration of fuel gas, which also results in a combustion state that is slightly different from the optimal combustion state.

[0056] In contrast, in the upper burner head 21 and the lower burner head 22 of this embodiment, even when the flame formed at the upper main flame port 21f of the upper burner head 21 and the lower main flame port 22f of the lower burner head 22 is set at a small set fire power, good combustion conditions can be maintained by the action of the grooves 21m and 22m formed on the opposing outer peripheral side surfaces 23a and 24a.

[0057] FIG. 8 shows the combustion of fuel gas in the upper burner head 21 and the lower burner head 22 of this embodiment, as viewed from above the upper burner head 21 and the lower burner head 22. As shown in the figure, grooves 21m and 22m are formed on the opposing outer peripheral side surfaces 23a and 24a of the upper burner head 21 and the lower burner head 22 of this embodiment. The groove 21m of the upper burner head 21 and the groove 22m of the lower burner head 22 are aligned vertically to form an integrated groove 20m (see FIG. 2). Furthermore, the upper end of the groove 20m penetrates to the upper surface 21c of the upper burner head 21 (see FIG. 5). Therefore, even if the flames formed in the upper main flame port 21f of the upper burner head 21 and the lower main flame port 22f of the lower burner head 22 are small, an air flow is generated that slowly rises from bottom to top within the groove 20m. As a result, an appropriate flow rate of air can be supplied to the flame (hatched in the figure) formed at the boundary between the opposing outer peripheral side surfaces 23a, 24a. The thick solid arrow in Figure 8 shows how air rises within groove 20m and is supplied to the flame adjacent to groove 20m.

[0058] As mentioned above, when the flames formed at the upper main flame port 21f of the upper burner head 21 and the lower main flame port 22f of the lower burner head 22 are small, the concentration of fuel gas in the mixed gas is relatively high. Therefore, as shown by the thick solid arrow in Fig. 8, by supplying air to the flames formed at the boundary positions with the opposing outer peripheral side surfaces 23a, 24a (the flames marked with diagonal lines in the drawing), the concentration of fuel gas can be made closer to the optimum concentration, thereby making it possible to improve the combustion state of the fuel gas.

[0059] Furthermore, in the stove burner 10, cooking liquid may spill onto the upper surface 21c of the upper burner head 21 during cooking. The spilled liquid may then trickle down the outer peripheral side surface 23 of the upper burner head 21 or the outer peripheral side surface 24 of the lower burner head 22, blocking the upper main flame nozzle 21f and the lower main flame nozzle 22f. When the upper main flame nozzle 21f or the lower main flame nozzle 22f is blocked, the fuel gas cannot be burned. Furthermore, if the number of blocked flame nozzles increases, a phenomenon known as backflow occurs, in which flames eject from the open end 12o of the main mixing tube 12. In addition, in the stove burner 10, in which the burner head 20 is formed by the upper burner head 21 and the lower burner head 22, clogging the upper main flame nozzle 21f or the lower main flame nozzle 22f with spilled liquid requires significant effort to remove the spilled liquid. Therefore, by raising the peripheral portion of the upper surface 21c of the upper burner head 21, even if the spilled liquid splashes onto the upper surface 21c of the upper burner head 21, it can be prevented from running down the outer peripheral side surface 23 of the upper burner head 21 or the outer peripheral side surface 24 of the lower burner head 22.

[0060] FIG. 9 is an explanatory diagram of a stove burner 10 in which a raised portion 26 is formed on the peripheral portion of the upper surface 21c of the upper burner head 21. As shown in the figure, the raised portion 26 formed on the peripheral portion of the upper surface 21c has a circumferentially continuous shape. Furthermore, at the upper end of the groove 21m, the circumferentially continuous raised portion 26 is interrupted, forming a notch 27. As a result, any spilled juices on the upper surface 21c of the upper burner head 21 are collected in the notch 27 and then trickle down from the notch 27 into the groove 20m. The shaded area in FIG. 9 shows the spilled juices on the upper surface 21c of the upper burner head 21 trickling down from the notch 27 into the groove 20m. In this way, the overflow flows through the recessed groove 20m, so there is no risk of the upper main flame port 21f of the upper burner head 21 or the lower main flame port 22f of the lower burner head 22 being blocked by the overflow.

[0061] In addition, in Figure 9, for all of the grooves 20m formed in five locations, the raised portion 26 is interrupted above the groove 20m to form a notch 27, but it is not necessary that a notch 27 is formed for all of the grooves 20m.

[0062] Furthermore, the overflowing liquid on the upper surface 21c of the upper burner head 21 trickles down from the notched portion 27 through the recessed groove 20m and reaches the burner body 11b on which the lower burner head 22 is mounted. The overflowing liquid that has reached the burner body 11b then trickles down the mounting surface 11a (see FIG. 3) of the burner body 11b on which the lower burner head 22 is mounted, spreading in the circumferential direction of the burner body 11b. As a result, not only are the small flame ports 22u below the recessed groove 20m onto which the overflowing liquid has trickled down blocked, but many other small flame ports 22u are also blocked, including the small flame port 22u facing the ignition plug 30 and the small flame port 22u facing the flame sensor 32. In other words, in the stove burner 10 of this embodiment shown in Figure 9, when overflowing liquid falls on the upper surface 21c of the upper burner head 21, the overflowing liquid is guided to the burner body 11b via the groove 20m, thereby actively blocking the small flame port 22u facing the ignition plug 30 and the small flame port 22u facing the flame sensor 32.

[0063] As described above, in the stove burner 10 of this embodiment, when combustion is started in the upper main flame nozzle 21f of the upper burner head 21 and the lower main flame nozzle 22f of the lower burner head 22, the small flame nozzle 22u is always burning, so combustion can be started by spreading the flame from the small flame nozzle 22u. Therefore, no spark plug is required to ignite the upper main flame nozzle 21f of the upper burner head 21 or the lower main flame nozzle 22f of the lower burner head 22; only the spark plug 30 for igniting the small flame nozzle 22u is required. Similarly, no flame sensor is required to detect the flame in the upper main flame nozzle 21f or the lower main flame nozzle 22f; only the flame sensor 32 for detecting the flame in the small flame nozzle 22u is required.

[0064] However, if the ignition plugs and flame sensors for the upper main flame nozzle 21f and the lower main flame nozzle 22f are eliminated, there is a risk that the upper main flame nozzle 21f and the lower main flame nozzle 22f may become blocked by spilled liquid, making it impossible to ignite the upper main flame nozzle 21f and the lower main flame nozzle 22f, or that even if the flame goes out, this cannot be detected.

[0065] In contrast, in the stove burner 10 of this embodiment shown in Figure 9, the overflow is collected in the recess 27 and guided to the burner body 11b via the recess 20m, so the small flame nozzle 22u is always blocked before the upper main flame nozzle 21f or the lower main flame nozzle 22f is blocked by overflow. Therefore, there is no need to consider the situation where the upper main flame nozzle 21f or the lower main flame nozzle 22f is blocked by overflow, and by installing the ignition plug 30 and flame sensor 32 for the small flame nozzle 22u, it is possible to reliably detect ignition failure or flame extinguishing in the stove burner 10.

[0066] The above describes the stove burner 10 and gas stove 1 of this embodiment, but the present invention is not limited to the above embodiment and can be implemented in various forms within the scope of its gist.

[0067] For example, the stove burner 10 of the above-described embodiment has been described as having a burner head 20 that can be separated into an upper burner head 21 and a lower burner head 22, and the upper main flame port groove 21b formed in the upper burner head 21 and the lower main flame port groove 22e formed in the lower burner head 22 being combined in a staggered manner, so that the upper main flame port groove 21b and the lower main flame port groove 22e form separate flame ports. However, the upper main flame port groove 21b of the upper burner head 21 and the lower main flame port groove 22e of the lower burner head 22 may be combined vertically to form an integrated flame port.

[0068] Furthermore, the stove burner 10 of the present embodiment described above has been explained as having a main flame port groove (upper main flame port groove 21b or lower main flame port groove 22e) formed in both the upper burner head 21 and the lower burner head 22. It is also possible to form a main flame port groove in only one of the upper burner head 21 and the lower burner head 22, so that the main flame port is formed when the upper burner head 21 is placed on the lower burner head 22.

[0069] Furthermore, the stove burner 10 of the above-described embodiment has been described as having a burner head 20 that can be separated into an upper burner head 21 and a lower burner head 22, with the small flame port 22u formed by placing the lower burner head 22 on the burner body 11b, and the main flame ports (upper main flame port 21f and lower main flame port 22f) larger than the small flame port 22u formed by placing the upper burner head 21 on the lower burner head 22. However, the burner heads may be formed as a single unit, and the main flame ports may be formed by placing the burner head on the burner body 11b.

[0070] Furthermore, the stove burner 10 of the present embodiment described above has been described as having the small flame port groove 22c formed on the underside of the lower burner head 22 so that when the lower burner head 22 is placed on the burner body 11b, the small flame port 22u is formed between the burner body 11b and the lower burner head 22. However, by forming the small flame port groove on the upper side of the burner body 11b, the small flame port may be formed when the lower burner head 22 is placed on the burner body 11b.

[0071] Furthermore, although the stove burner 10 of the present embodiment described above ignites the mixed gas by generating a spark from the spark plug 30, it may also be configured to ignite the mixed gas by heating it using a heater.

[0072] Furthermore, the stove burner 10 of the present embodiment described above is equipped with a ring-shaped burner head 20 with an insertion hole 20h formed in the center of the burner head 20, but this is not limited to this, and the stove burner may also be equipped with a disk-shaped burner head with the insertion hole 20h portion blocked, for example. [Explanation of symbols]

[0073] 1...Gas stove, 2...Main body case, 3...Top plate, 4...Trivet, 4a...trivet ring, 4b...trivet claws, 5...temperature sensor, 7...grill door, 8...Stove operation button, 9...Grill operation button, 10...Stove burner, 11... burner main body, 11a... mounting surface, 11b... burner body, 12...parent mixing tube, 12o...open end, 13...child mixing tube, 13o...open end, 14... Central cylinder, 15... Partition cylinder, 15a... Fitting surface, 16... Mixing chamber, 16c...child mixing room, 16p...parent mixing room, 20...burner head, 20h...insertion hole, 20m...groove, 21...upper burner head, 21a...Upper cylindrical wall, 21b...Upper main flame outlet groove, 21c...Upper surface, 21f...upper main flame port, 21m...groove, 22...lower burner head, 22a...Partition tube, 22b...Bottom side cylindrical wall, 22c...Small flame opening groove, 22d...Lower cylindrical wall, 22e...Lower main flame outlet groove, 22f...Lower main flame outlet, 22m...Concave groove, 22u...Small flame opening, 23...Outer side surface, 23a...opposing outer peripheral side surface, 23b...non-opposing outer peripheral side surface, 24...outer peripheral side surface, 24a...Opposing outer circumferential side, 24b...Non-opposing outer circumferential side, 25...Outer circumferential side, 26...protrusion, 27...missing portion, 30...spark plug, 31... ignition target, 32... flame sensor, 40... gas supply pipe, 40c...connecting pipe, 40p...connecting pipe, 41...gas flow control valve, 42...opening / closing valve, 43c...gas injection nozzle, 43p...gas injection nozzle, 44c... nozzle hole, 44p... nozzle hole, 91... upper burner head, 92...lower burner head, 93...outer peripheral side surface, 93a...opposite outer peripheral side surface, 93b...non-opposing outer peripheral side surface, 94...outer peripheral side surface, 94a...opposing outer peripheral side surface, 94b...Non-opposing outer peripheral side surface.

Claims

1. A stove burner is mounted on a gas stove with a trivet placed on the top plate, and burns a mixture of fuel gas and air to heat the bottom of a cooking vessel placed on the trivet claws of the trivet. a burner body into which the mixed gas flows; a burner head that is placed on the burner body, receives the mixed gas from the burner body, and burns the mixed gas by discharging the mixed gas from a plurality of main flame ports that open on an outer peripheral side surface formed in a cylindrical surface shape; Equipped with The outer peripheral side surface of the burner head has an opposing outer peripheral side surface that faces the trivet claws when the stove burner is mounted on the gas stove, and a non-opposing outer peripheral side surface that does not face the trivet claws, The main flame port is formed on the non-opposing outer peripheral side surface, not on the opposing outer peripheral side surface, Instead of the main flame port being formed on the opposing outer peripheral side surface, a recessed groove extending in the vertical direction and in a direction along the opposing outer peripheral side surface is formed. A stove burner characterized by:

2. The stove burner according to claim 1, the groove penetrates the upper surface of the burner head, a circumferentially continuous raised portion is formed between a portion of the periphery of the upper surface of the burner head through which the recessed groove penetrates and an adjacent portion through which the recessed groove penetrates, by the peripheral portion of the upper surface being raised upward, At the periphery of the upper surface of the burner head where the recessed groove penetrates, the raised portion is discontinued to form a notched portion. A stove burner characterized by:

3. The stove burner according to claim 1 or 2, The burner head is a lower burner head placed on the burner body; an upper burner head placed on the lower burner head; It is equipped with At least one of the burner body and the lower burner head is shaped so that when the lower burner head is placed on the burner body, a plurality of small flame ports smaller than the main flame port are formed around the entire circumference between the burner body and the lower burner head, At least one of the upper burner head and the lower burner head is configured such that, when the upper burner head is placed on the lower burner head, the plurality of main flame ports are formed on the non-opposing outer peripheral side surface, and the recessed groove is formed on the opposing outer peripheral side surface. A stove burner characterized by:

4. The stove burner according to claim 3, The lower burner head is a cylindrical bottom wall that projects downward from an outer periphery of the bottom surface and is placed on the burner body; a cylindrical lower cylindrical wall projecting upward from the outer periphery of the upper surface; It is equipped with the upper burner head includes a cylindrical upper cylindrical wall that protrudes downward from an outer circumferential portion of a bottom surface and is placed on the lower cylindrical wall of the lower burner head, the bottom-side cylindrical wall has a plurality of small flame port grooves formed on a lower end surface of the bottom-side cylindrical wall, the small flame port being formed between the bottom-side cylindrical wall and the burner body by being placed on the burner body, The lower cylindrical wall is a plurality of the recessed grooves formed in a portion of the outer peripheral side surface of the lower cylindrical wall corresponding to the opposing outer peripheral side surface; a plurality of lower main flame port grooves, each formed on an upper end surface of the lower cylindrical wall at a portion where the outer peripheral side surface of the lower cylindrical wall corresponds to the non-opposing outer peripheral side surface, and which form the main flame port between the upper burner head and the grooves and the upper burner head when the upper burner head is placed thereon; It has The upper cylindrical wall is a plurality of the recessed grooves formed in a portion of the outer peripheral side surface of the upper cylindrical wall corresponding to the opposing outer peripheral side surface; a plurality of upper main flame port grooves formed on the lower end surface of the upper cylindrical wall in a portion where the outer peripheral side surface of the upper cylindrical wall corresponds to the non-opposing outer peripheral side surface, and which form the main flame port between the upper cylindrical wall and the lower burner head by being placed on the lower burner head; have A stove burner characterized by:

5. The stove burner according to claim 3 or claim 4, The intervals between the plurality of small flame ports are set so that when a flame is formed in one of the small flame ports, the flame spreads to the adjacent small flame port, The intervals between the plurality of main flame ports and the small flame ports are set so that when a flame is formed in the small flame port, the flame spreads to the main flame port above the small flame port, an ignition means for igniting some of the small flame ports among the plurality of small flame ports; a flame detection means for detecting a flame formed in the small flame nozzle different from the small flame nozzle ignited by the ignition means; A stove burner characterized by comprising:

6. A gas stove equipped with the stove burner according to any one of claims 1 to 5.

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