Stove burner, gas stove

Abstract

To materialize a cooking stove burner(10) and a gas cooking stove (1) capable of surely detect a flame from a flame nozzle regardless of its fire power.SOLUTION: A first flame nozzle (22u) is ignited by ignition means (30), and the resulting flame is spread to start combustion from all of the first flame nozzles, and the flames from the first flame nozzles are spread to second flame nozzles (21f) disposed above the first flame nozzles to start combustion from all of the second flame nozzles. Among the first flame nozzles, flame detection flame nozzles (27) whereat flame detection means detects flames, are formed on positions located inside in the radial direction of the outer peripheral side surface of a burner head (20), relative to the other first flame nozzles. Among the plurality of the second flame nozzles, flame nozzles (26) disposed above the flame detection flame nozzles are formed on positions located inside in the radial direction of the outer peripheral side surface of the burner head, relative to the other second flame nozzles. Thereby, flames can stably be detected since the flames from the flame detection flame nozzles can be prevented from moving outward in the radial direction.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a stove burner that has flame ports formed in two tiers, upper and lower, burns mixed gas in the lower flame port when the heat is low, and burns mixed gas also in the upper flame port when the heat is high, and is capable of detecting the flame formed in the lower flame port, and a gas stove equipped with the stove burner. [Background technology]

[0002] A gas stove heats and cooks food in a cooking vessel by burning fuel gas, and is equipped with a stove burner for burning the fuel gas. The stove burner has a structure in which a burner head having an outer peripheral side surface of a cylindrical surface shape is mounted on a hollow burner body, a mixing passage is connected to the burner body, and a plurality of flame ports are formed on the outer peripheral side surface of the burner head in a state of being open and aligned in the circumferential direction. The mixing passage has an open end on the side not connected to the burner body, and when fuel gas is injected toward the open end, the fuel gas flows into the mixing passage while drawing in air, and the mixed gas formed by mixing the fuel gas and air in the mixing passage flows into the burner body. The mixed gas that flows into the burner body is supplied from the burner body to the burner head, and then flows out from a plurality of flame ports that open on the outer peripheral side surface of the burner head. When the mixed gas that flows out from the flame ports in this way is ignited by, for example, throwing a spark from an ignition plug, it is possible to start the combustion of the fuel gas in the stove burner.

[0003] The stove burner is also equipped with a flame sensor that detects the flame formed at the flame port. The flame sensor has the property of generating an electromotive force when the temperature rises, and by mounting the flame sensor at a position where it is heated by the flame formed at the flame port, it is possible to detect the formation of a flame at the flame port. Therefore, even if ignition fails and combustion cannot be started, or if the flame goes out during combustion, the injection of fuel gas into the mixing passage can be stopped to prevent the mixed gas from flowing out of the flame port.

[0004] Here, the size of the flame formed at the flame port changes depending on the heat generated by the stove burner, and when the heat generated is small, the flame is also small. In order to be able to reliably detect even this small flame, it is desirable to mount the flame sensor at a position where it is heated by the high-temperature part of the flame, called the "outer flame." On the other hand, when the heat generated is large, the flame formed at the flame port also becomes large, so if the flame sensor is mounted at a position where it can reliably detect a small flame, when the flame grows large, the flame sensor will be heated by the low-temperature part of the flame, called the "inner flame." As a result, the flame sensor cannot generate sufficient electromotive force, making it difficult to reliably detect the flame.

[0005] Therefore, in order to reliably detect flames regardless of the firepower generated by the stove burner, a stove burner has been proposed in which the outer peripheral side of the burner head where the multiple flame ports are open is recessed radially inward at the position facing the flame sensor (Patent Document 1). In this proposed stove burner, the flame port (hereinafter referred to as the "flame detection flame port") formed at the position facing the flame sensor is formed at a position deeper than the other flame ports (hereinafter referred to as the "normal flame port"). Therefore, the mixed gas flowing out from the flame detection flame port has a slight shortage of air required for combustion compared to the mixed gas flowing out from the normal flame port, and the flame is formed at the flame detection flame port at a position farther away from the flame port than the normal flame port. Therefore, the difference between the position where a small flame is formed and the position where a large flame is formed can be reduced, so that the flame can be reliably detected even if the firepower of the stove burner is changed and the size of the flame changes. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2017-020705 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, in stove burners (hereinafter referred to as "two-tier burners") which have a two-tiered flame port, with the mixed gas burned in the lower flame port when the required heat is low, and the mixed gas also burned in the upper flame port when high heat is required, there was a problem in that simply forming the flame detection flame port in a recessed position compared to a normal flame port meant that the flame could not be reliably detected when the heat was high.

[0008] This invention has been made to solve the above-mentioned problems associated with the conventional technology, and aims to realize a stove burner and gas stove that are capable of reliably detecting the flame formed in the flame port regardless of the power of the fire. [Means for solving the problem]

[0009] In order to solve the above problems, the stove burner of the present invention adopts the following configuration. A stove burner comprising: a burner body to which a mixed gas of fuel gas and air is supplied; a burner head placed on the burner body and having a cylindrical outer peripheral side formed with a plurality of flame ports, and causing the mixed gas flowing in from the burner body to flow out from the plurality of flame ports; ignition means for igniting the mixed gas flowing out from some of the plurality of flame ports; and flame detection means provided at a position facing a flame port different from the flame port through which the mixed gas is ignited by the ignition means and for detecting a flame formed in the flame port facing the burner, The burner head includes: The plurality of flame ports include a plurality of first flame ports formed in a circumferential direction of the outer circumferential side surface, and a plurality of second flame ports formed in a circumferential direction at a position above the first flame ports, The distance between adjacent first flame ports is set to a distance that allows a flame formed in one of the first flame ports to spread to the other first flame port, and the distance between the first flame port and the second flame port above is set to a distance that allows a flame formed in the first flame port to spread to the second flame port above, the ignition means ignites the mixed gas flowing out from the first flame port, not from the second flame port; The flame detection means detects a flame formed in the first flame port, not in the second flame port, Among the plurality of first flame ports, a flame detection flame port at which the flame detection means detects a flame is formed at a position radially inward of the burner head relative to the other first flame ports, Among the plurality of second flame ports, a detection upper flame port formed above the flame detection flame port is formed at a position radially inward of the burner head relative to the other second flame ports. It is characterized by:

[0010] In such a stove burner of the present invention, when some of the first flame ports are ignited using the ignition means, the flame formed in the first flame port spreads to the other first flame ports, so that combustion starts in all of the first flame ports, and the flame can be detected by the flame detection means. Also, when combustion starts in all of the first flame ports, the flame in the first flame port spreads to the second flame port formed above the first flame port, so that combustion can also start in all of the second flame ports. Here, the flame detection flame port where the flame detection means detects the flame among the multiple first flame ports is formed at a position radially inward of the outer peripheral side surface of the burner head than the other first flame ports, so that the flame can be stably detected even if the size of the flame formed in the flame detection flame port changes. Also, the detection upper flame port formed above the flame detection flame port among the multiple second flame ports does not detect the flame by the flame detection means, but is formed at a position radially inward of the outer peripheral side surface of the burner head than the other second flame ports.

[0011] Although the detailed mechanism will be described later, it was found that if the detection upper flame port is formed at the same position in the radial direction of the outer peripheral side surface as the other second flame ports, the flame formed in the detection upper flame port moves radially outward due to the influence of the flame formed in the detection upper flame port, and the flame cannot be stably detected by the flame detection means. Therefore, if the detection upper flame port is formed radially inward on the outer peripheral side surface relative to the other second flame ports, the position of the flame formed in the detection upper flame port also moves radially inward, so that the flame formed in the flame detection flame port can be prevented from moving radially outward. Therefore, even if a flame is formed in the detection upper flame port and the second flame port, the flame formed in the flame detection flame port can be stably detected by the flame detection means.

[0012] In the stove burner of the present invention described above, a plurality of flame detection ports may be formed adjacent to each other, and a plurality of detection upper ports may be formed adjacent to each other above the flame detection ports. The detection upper port row in which the plurality of detection upper ports are adjacent to each other may be formed to be wider in the circumferential direction of the outer circumferential side surface than the flame detection port row in which the plurality of flame detection ports are adjacent to each other.

[0013] This ensures the necessary distance between the flame in the flame detection port and the flame in the second port, thereby preventing a situation in which the flame in the second port moves the flame in the flame detection port radially outward, making it impossible for the flame detection means to stably detect the flame.

[0014] In addition, in the stove burner of the present invention described above, a protrusion protruding radially from the outer peripheral side surface may be formed between the portion of the outer peripheral side surface where the flame detection flame port is formed and the portion where the detection upper flame port is formed.

[0015] In this way, the flame formed in the detection upper flame port is blocked by the protruding portion, so that the influence on the flame in the flame detection flame port can be suppressed. As a result, even if a flame is formed in the detection upper flame port and the second flame port, the flame formed in the flame detection flame port can be stably detected by the flame detection means.

[0016] In the above-mentioned stove burner of the present invention, the burner head may be divided into an upper burner head and a lower burner head, and the lower burner head may be placed on the burner body, and the upper burner head may be placed on the lower burner head. The first and second flame ports may be formed by forming the lower burner head and the upper burner head in the following shape. First, the lower burner head has a cylindrical bottom side tubular wall protruding downward from the outer periphery of the bottom surface, and a cylindrical lower side tubular wall protruding upward from the outer periphery of the top surface. Also, the upper burner head has a cylindrical upper side tubular wall protruding downward from the outer periphery of the bottom surface. Then, a plurality of first flame port grooves are formed on the lower end surface of the bottom side tubular wall, which form the first flame port when the lower burner head is placed on the burner body. Further, the lower cylindrical wall is formed with a plurality of lower second flame port grooves that form the second flame port when the upper burner head is placed thereon, and the upper cylindrical wall is formed with a plurality of lower second flame port grooves that form the second flame port when the lower burner head is placed thereon. The upper second flame port grooves of the upper burner head may be formed at positions that are alternated in the circumferential direction of the outer circumferential side surface with respect to the lower second flame port grooves of the lower burner head when the upper burner head is placed on the lower burner head.

[0017] In this way, the second flame port is formed in two parts, a part formed between the lower second flame port groove and the upper cylindrical wall, and a part formed between the upper second flame port groove and the lower cylindrical wall, so the flame formed in the second flame port is also formed in two parts. Therefore, it is possible to stably detect the flame in the flame detection flame port while stabilizing the combustion in the second flame port.

[0018] 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 height of the first flame port groove that forms the flame detection flame port when the lower burner head is placed on the burner body may be set to a dimension larger than the height of the other first flame port grooves. Accordingly, the sum of the heights of the lower second flame port groove and the upper second flame port groove that form the detection upper flame port when the upper burner head is placed on the lower burner head may be set to a value smaller than the sum of the heights of the other lower second flame port grooves and upper second flame port grooves.

[0019] In this way, a large flame can be formed in the flame detection port, making it possible to stably detect the flame using the flame detection means.

[0020] Moreover, the stove burner of the present invention may be mounted on a gas stove.

[0021] In this way, a gas stove capable of stably detecting flames can be realized. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a perspective view showing the external shape of a gas stove 1 equipped with a stove burner 10 of this embodiment. [Diagram 2] 1 is a perspective view showing the general shape of a stove burner 10 according to the present embodiment. FIG. [Diagram 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 an enlarged view of a portion of the burner head 20 where a flame detection flame port 27 is formed, as seen from diagonally below the burner head 20. FIG. [Diagram 5] This is an explanatory diagram showing how the flame detection flame port 27a of the lower burner head 22 is formed radially inward from the small flame port 22u, and how the detection upper flame port 26 of the upper burner head 21 is formed radially inward from the upper main flame port 21f. [Figure 6]This is an explanatory diagram showing the positional relationship between the flame formed in the flame detection port 27 and the flame sensor 32 when the upper main flame port 21f above the flame detection port 27 has not been moved radially inward of the burner head 20. [Figure 7] This is an explanatory diagram showing why, in the stove burner 10 of this embodiment, even if a flame is formed in the detection upper flame port 26, the flame sensor 32 can stably detect the flame in the flame detection flame port 27. [Figure 8] FIG. 10 is an explanatory diagram of a modified stove burner 10. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] 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 1 that is fitted into the countertop of a system kitchen (not shown) and is equipped with 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.

[0024] Inside the main body case 2, two stove burners 10, each consisting of a parent burner and a child burner, which will be described later, are arranged side by side, and housed with their upper parts protruding from insertion holes formed in the top plate 3. In addition, trivets 4 are installed on the top plate 3 so as to surround the protruding parts of the upper parts of each stove burner 10, and by placing a cooking vessel such as a pot on the trivet 4, the cooking vessel can be heated from below by the stove burner 10.

[0025] Furthermore, the stove burner 10 has a built-in temperature sensor 5 penetrating through the center. The temperature sensor 5 is urged upward by a spring (not shown), so that the upper part of the temperature sensor 5 protrudes from the center of the upper surface of the stove burner 10. When a cooking container is placed on the trivet 4, the bottom surface of the cooking container presses down on the temperature sensor 5, so that the upper end of the temperature sensor 5 comes into contact with the bottom surface of the cooking container, making it possible to detect the temperature of the cooking container.

[0026] A grill door 7 is provided on the front of the gas stove 1, and a grill chamber and grill burners (not shown) are mounted behind the grill door 7. Two stove operation buttons 8 corresponding to two stove burners 10 are provided on the right side of the grill door 7, and a user of the gas stove 1 can ignite, extinguish, or adjust the flame 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 a user can ignite, extinguish, or adjust the flame of the grill burner by operating the grill operation button 9.

[0027] FIG. 2 is a perspective view showing the rough shape of the stove burner 10 of this embodiment. As shown in the figure, the stove burner 10 is provided with a burner body 11 formed by combining sheet metal members, and a burner head 20 having a substantially cylindrical shape. The burner body 11 is provided with a substantially cylindrical burner body 11b, a parent mixing passage 12 connected to the burner body 11b, and a child mixing passage 13 having a smaller diameter than the parent mixing passage 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.

[0028] The burner head 20 is a member divided into upper and lower two stages, 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. In the state in which the upper burner head 21 is placed on the lower burner head 22 as shown in the figure, as shown in an enlarged view in FIG. 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 a position where the upper main flame port 21f and the lower main flame port 22f are alternated.

[0029] In addition, when the burner head 20 is placed on the burner body 11b, a plurality of small flame ports (hereinafter, small flame ports 22u) are formed between the lower burner head 22 and the burner body 11b. As described later, inside the burner body 11b, a space to which the parent mixing passage 12 is connected and a space to which the child mixing passage 13 is connected are formed. The small flame port 22u formed between the lower burner head 22 and the burner body 11b communicates with the space to which the child mixing passage 13 is connected. In addition, 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 communicate with the space to which the parent mixing passage 12 is connected. For this reason, as described later, when fuel gas is supplied to the child mixing passage 13, the fuel gas flows out from the small flame port 22u, and when fuel gas is supplied to the parent mixing passage 12, the fuel gas flows out from the upper main flame port 21f and the lower main flame port 22f. The small flame nozzle 22u of this embodiment corresponds to the "first flame nozzle" of the present invention, and the upper main flame nozzle 21f and the lower main flame nozzle 22f of this embodiment correspond to the "second flame nozzle" of the present invention.

[0030] Fuel gas is supplied to the parent mixing passage 12 and the child mixing passage 13 as follows. First, the parent mixing passage 12 has an open end 12o on the side not connected to the burner body 11b, and the child mixing passage 13 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 parent mixing passage 12, and a gas injection nozzle 43c is provided at a position facing the open end 13o of the child mixing passage 13. In the following, the gas injection nozzle 43p provided on the parent mixing passage 12 side may be referred to as the "parent side gas injection nozzle 43p", and the gas injection nozzle 43c provided on the child mixing passage 13 side may be referred to as the "child side gas injection nozzle 43c". The parent side gas injection nozzle 43p is connected to the connecting pipe 40p, and the child side gas injection nozzle 43c is connected to the connecting pipe 40c. These two connecting pipes 40p, 40c branch off from the gas supply pipe 40.

[0031] When fuel gas is supplied to the gas supply pipe 40, the fuel gas is branched into the connection pipe 40p and the connection pipe 40c, and is supplied to the parent-side gas injection nozzle 43p and the child-side gas injection nozzle 43c. Then, the fuel gas is injected from the nozzle hole 44p formed at the tip of the parent-side gas injection nozzle 43p toward the opening end 12o of the parent mixing passage 12. The injected fuel gas flows into the parent mixing passage 12 while drawing in the surrounding air due to the ejector effect, and after mixing with the air in the parent mixing passage 12, flows out from the upper main flame port 21f and the lower main flame port 22f. Similarly, the fuel gas is injected from the nozzle hole 44c formed at the tip of the child-side gas injection nozzle 43c toward the opening end 13o of the child mixing passage 13. The injected fuel gas flows into the child mixing passage 13 while drawing in the surrounding air due to the ejector effect, and after mixing with the air in the child mixing passage 13, flows out from the small flame port 22u.

[0032] Here, the nozzle hole 44p formed in the parent gas injection nozzle 43p is set to a larger diameter than the nozzle hole 44c formed in the child gas injection nozzle 43c. Therefore, the parent gas injection nozzle 43p can inject a larger amount of fuel gas than the child gas injection nozzle 43c. Corresponding to this, the parent mixing passage 12 is formed to have a larger diameter than the child mixing passage 13. In addition, a gas flow rate control valve 41 for controlling the gas flow rate of the fuel gas is attached to the middle of the gas supply pipe 40. Furthermore, an opening / closing valve 42 for opening and closing the connecting pipe 40p is attached to the middle of the connecting pipe 40p that supplies the fuel gas to the parent mixing passage 12.

[0033] In addition, the burner main body 11 is provided with an ignition plug 30 and a flame sensor 32 in the vicinity of the outer circumferential surface of the burner body 11b. The ignition plug 30 of this embodiment corresponds to the "ignition means" of the present invention, and the flame sensor 32 of this embodiment corresponds to the "flame detection means" of the present invention. Furthermore, an ignition target (not shown) is protruding from the outer circumferential surface of the burner head 20 above the ignition plug 30, and a spark plug hood 31 larger than the ignition target is protruding from above the ignition target to prevent the ignition plug 30 from being splashed with boiled-over juice. When the gas flow rate control valve 41 is opened while the spark plug 30 is spark-discharged toward the ignition target below the spark plug hood 31 with the opening / closing valve 42 in a fully closed state, fuel gas flows out from the small flame port 22u, and the fuel gas is ignited to start combustion.

[0034] Here, the interval 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 starts in the small flame port 22u near the ignition plug 30, the flame spreads to the adjacent small flame ports 22u one after another, so that combustion of fuel gas starts in all of the small flame ports 22u. The flame sensor 32 can detect the flame generated in the small flame port 22u.

[0035] Furthermore, when the on-off valve 42 is opened while a flame is being formed in the small flame port 22u, fuel gas also flows out from the upper main flame port 21f and the lower main flame port 22f. Here, the distance between the small flame port 22u and the lower main flame port 22f above it is set to a distance such that when a flame is formed in the small flame port 22u, a flame is also formed in the lower main flame port 22f above by that flame. Therefore, the flame in the small flame port 22u starts combustion of fuel gas in the lower main flame port 22f and the upper main flame port 21f as well.

[0036] In addition, the stove burner 10 of this embodiment is provided with an ignition plug 30 for igniting the fuel gas flowing out from the small flame port 22u, but is not provided with an ignition plug for igniting the fuel gas flowing out from the lower main flame port 22f or the upper main flame port 21f. The reason for this is as follows. As described above with reference to FIG. 2, the upper main flame port 21f and the lower main flame port 22f are set to have a larger opening area than the small flame port 22u. In addition, the parent mixing passage 12 communicating with the upper main flame port 21f and the lower main flame port 22f inside the burner body 11 is formed with a larger diameter than the child mixing passage 13 communicating with the small flame port 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 port 21f and the lower main flame port 22f can burn a larger amount of fuel gas than the small flame port 22u to generate a large firepower. For this reason, the stove burner 10 burns fuel gas in the small flame port 22u while the required heat is small, and when a large heat is required, the stove burner 10 also burns fuel gas in the upper main flame port 21f and the lower main flame port 22f. When returning to a small heat, the combustion in the small flame port 22u continues, and the combustion in the upper main flame port 21f and the lower main flame port 22f is stopped.

[0037] In this way, in the stove burner 10 of this embodiment, when the upper main flame nozzle 21f and the lower main flame nozzle 22f start combustion, the fuel gas is always burning in the small flame nozzle 22u. Therefore, if the fuel gas flowing out from the small flame nozzle 22u can be ignited by the ignition plug 30, the flame of the small flame nozzle 22u can be transferred to the lower main flame nozzle 22f and the upper main flame nozzle 21f to start combustion. For this reason, if the ignition plug 30 for igniting the small flame nozzle 22u is installed, there is no need to install an ignition plug for igniting the lower main flame nozzle 22f and the upper main flame nozzle 21f. The small flame nozzle 22u part of the stove burner 10 is sometimes called the "child burner", and the upper main flame nozzle 21f and the lower main flame nozzle 22f part of the stove burner 10 are sometimes called the "parent burner".

[0038] 3 is an exploded view showing the internal structure of the burner body 11b and the burner head 20 of the stove burner 10 of this embodiment. As shown in the figure, the burner body 11b, which is substantially cylindrical, is bent inward at the upper end to form an annular mounting surface 11a on which the burner head 20 is mounted. In addition, a cylindrical central cylinder 14 is erected inside the burner body 11b, and a ring-shaped mixing chamber 16 to which mixed gas is supplied is formed between the burner body 11b and the central cylinder 14.

[0039] Furthermore, a substantially cylindrical partition cylinder 15 is provided between the burner body 11b and the central cylinder 14, and the 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 parent mixing chamber 16p, which will be described later, and the space outside the partition cylinder 15 becomes a child mixing chamber 16c, which will be described later. The partition cylinder 15 is formed of a sheet metal member like the burner body 11b, and the upper end side of the cylindrical shape is bent inward, and then the inner edge of the bent part is bent downward to form a short cylindrical fitting surface 15a.

[0040] 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 member having a substantially annular shape, and a cylindrical partition wall tube 22a is hung downward from the inner edge part of the annular shape. In addition, a cylindrical bottom side cylindrical wall 22b, which is shorter than the partition wall tube 22a, is hung downward from the bottom side of the peripheral part of the lower burner head 22, and 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 side cylindrical wall 22b (the surface that abuts against the mounting surface 11a of the burner body 11b). Furthermore, a lower cylindrical wall 22d, which is longer than the bottom cylindrical wall 22b, is erected upward from the upper surface side of the peripheral portion of the lower burner head 22, and a plurality of lower main flame hole grooves 22e are drilled downward radially from the center of the lower cylindrical wall 22d on the upper end surface of the lower cylindrical wall 22d. Furthermore, an ignition plug visor 31 protrudes from the outer peripheral side surface of the lower cylindrical wall 22d of the lower burner head 22 to a position above the above-mentioned ignition plug 30. The small flame hole groove 22c of this embodiment corresponds to the "first flame hole groove" of the present invention. The lower main flame hole groove 22e of this embodiment corresponds to the "second lower flame hole groove" of the present invention.

[0041] On the other hand, the upper burner head 21 is formed in an annular shape, and a cylindrical inner tube (not shown) is hung downward from the inner edge. Furthermore, a cylindrical upper cylindrical wall 21a is provided downward from the peripheral edge, and a plurality of upper main flame hole grooves 21b are formed radially from the center of the upper cylindrical wall 21a on the lower end surface of the upper cylindrical wall 21a. The upper main flame hole grooves 21b in this embodiment correspond to the "upper second flame hole grooves" in the present invention.

[0042] When the upper burner head 21 having the above-mentioned shape is placed 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 and the lower main flame port groove 22e of the lower burner head 22 do not overlap. 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 of the lower cylindrical wall 22d. Also, the bottom surface of the bottom side cylindrical wall 22b drilled in the lower end surface of the upper cylindrical wall 21a of the upper burner head 21 is closed by the upper end surface of the lower cylindrical wall 22d of the lower burner head 22, and an upper main flame port 21f (see FIG. 2) is formed at the location where the upper main flame port groove 21b opens on the outer peripheral side surface of the upper cylindrical wall 21a. As a result, the upper main flame port 21f and the lower main flame port 22f are formed in alternate positions (hence, with their positions shifted in the circumferential direction) as shown in FIG. 2.

[0043] When placing the burner head 20 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, while the inner cylinder (not shown) suspended downward from the inner edge of the upper burner head 21 is inserted inside the central cylinder 14, and the burner head 20 is lowered. Then, the lower main flame port groove 22e protruding downward from the peripheral portion 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.

[0044] 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 peripheral surface of the upper part of the central cylinder 14. As a result, a sub-mixing chamber 16c surrounded by the partition cylinder 15, the burner body 11b, and the lower burner head 22 is formed outside the partition cylinder 15. This sub-mixing chamber 16c is connected to the sub-mixing passage 13. In addition, a parent mixing chamber 16p surrounded by the central cylinder 14, the partition cylinder 15, the partition cylinder 22a, and the upper burner head 21 is formed inside the partition cylinder 15. This parent mixing chamber 16p is connected to the parent mixing passage 12.

[0045] The stove burner 10 of this embodiment having the above structure can ignite the fuel gas flowing out of at least one small flame nozzle 22u, and can transfer the flame to all the small flame nozzles 22u. Furthermore, the flame formed in the small flame nozzle 22u can be transferred to the lower main flame nozzle 22f and the upper main flame nozzle 21f formed above the small flame nozzle 22u. Therefore, it is sufficient for the ignition plug 30 of the stove burner 10 of this embodiment to be able to ignite the fuel gas flowing out of the small flame nozzle 22u, and it is sufficient for the flame sensor 32 to detect the flame formed in the small flame nozzle 22u. For this reason, the ignition plug 30 and the flame sensor 32 are mounted at a position facing the small flame nozzle 22u. Here, in order to ensure that the flame sensor 32 can detect the flame reliably even if the size of the flame formed in the small flame nozzle 22u changes, the small flame nozzle 22u at the position facing the flame sensor 32 is formed in a different shape from the small flame nozzles 22u at other positions. Hereinafter, the small flame port 22u located opposite the flame sensor 32 will be referred to as the "flame detection flame port 27."

[0046] FIG. 4 is an explanatory diagram showing an enlarged view of the burner head 20 where the flame detection flame port 27 is formed, by looking up at the burner head 20 from diagonally below. In FIG. 4, only the outlines of the flame sensor 32 and the ignition plug 30 are shown with dashed lines. As shown in the figure, the lower burner head 22 is placed on the burner body 11b, so that a plurality of small flame ports 22u are formed in the bottom side cylindrical wall 22b. In addition, at a position facing the flame sensor 32, the bottom side cylindrical wall 22b is recessed radially inward, and a plurality of flame detection flame ports 27 (three in this embodiment) are formed in the recessed portion. In FIG. 4, the flame detection flame port 27 is shown with fine diagonal lines. Of these three flame detection ports 27, the middle one is a flame detection port 27b that is smaller in height than the small flame port 22u, and the two flame detection ports 27 on both sides are flame detection port 27a that is larger in height than the small flame port 22u. In the following, the row of these multiple flame detection ports 27 may be referred to as the "flame detection port row 27L."

[0047] In addition, the stove burner 10 of this embodiment is equipped with an ignition plug 30 next to the flame sensor 32, and the bottom side cylindrical wall 22b at a position facing the ignition plug 30 is recessed radially inward to the same position as the bottom side cylindrical wall 22b at a position facing the flame sensor 32. A plurality of (five in this embodiment) ignition flame ports 28 are formed in the recessed portion. Therefore, the plurality of ignition flame ports 28 are formed on the bottom side cylindrical wall 22b with the same radius as the flame detection flame port 27. An ignition target 31t is protruded from the lower cylindrical wall 22d above the plurality of ignition flame ports 28.

[0048] Furthermore, a plurality of lower main flame ports 22f are formed in the lower cylindrical wall 22d formed above the small flame port 22u. However, the lower main flame port 22f is not formed above the flame detection flame port row 27L. This is because the height dimension of the flame detection flame port 27a is larger than that of the small flame port 22u, and therefore there is no space to form the lower main flame port 22f. Therefore, by reducing the height dimension of the flame detection flame port 27a, a plurality of lower main flame ports 22f with a small height dimension may be formed above the flame detection flame port row 27L. However, because the flame detection port 27a has a larger height dimension than the small port 22u, even if the lower main port 22f is formed above the flame detection port 27a, the sum of the height dimension of the lower main port 22f and the height dimension of the detection upper port 26 is smaller than the sum of the height dimension of the lower main port 22f formed above the small port 22u and the height dimension of the upper main port 21f. Also, in this embodiment, the lower main port 22f is not formed above the flame detection port 27a, so this corresponds to the case where the height dimension of the lower main port 22f is 0.

[0049] In addition, in the stove burner 10 of this embodiment, the lower main flame port 22f is not formed in the lower cylindrical wall 22d above the multiple ignition flame ports 28. The reason for this is that the ignition target 31t is formed above the multiple ignition flame ports 28, so there is no space to form the lower main flame port 22f. Therefore, by reducing the height dimension of the ignition target 31t, multiple lower main flame ports 22f with small height dimensions may be formed in the lower cylindrical wall 22d above the multiple ignition flame ports 28.

[0050] A plurality of upper main flame ports 21f are formed in the upper cylindrical wall 21a of the upper burner head 21 placed on the lower burner head 22. The upper cylindrical wall 21a is recessed radially inward in a portion located above the flame detection flame port row 27L of the lower burner head 22, and a plurality of (five in this embodiment) detection upper flame ports 26 are formed in the recessed portion. In FIG. 4, the detection upper flame ports 26 are shown with rough diagonal lines. The shape of the detection upper flame port 26 is the same as that of the upper main flame port 21f, but the detection upper flame port 26 is formed at a position recessed radially inward from the upper main flame port 21f. In the following, the row of the plurality of detection upper flame ports 26 may be referred to as the "detection upper flame port row 26L". Also, as shown in Figure 4, the horizontal width (circumferential width of the upper burner head 21) of the detection upper flame port row 26L formed in the upper burner head 21 is larger than the horizontal width (circumferential width of the lower burner head 22) of the flame detection flame port row 27L formed in the lower burner head 22.

[0051] Fig. 5 is an explanatory diagram showing how the flame detection port 27a of the lower burner head 22 is formed radially inward from the small flame port 22u, and how the detection upper flame port 26 of the upper burner head 21 is formed radially inward from the upper main flame port 21f. Fig. 5(a) shows a cross-sectional view of the stove burner 10 cut along a plane passing through the flame detection port 27a and the detection upper flame port 26. Fig. 5(b) also shows a cross-sectional view of the stove burner 10 cut along a plane passing through the small flame port 22u for reference.

[0052] In FIG. 5(a), the outline of the flame sensor 32 is shown by a thin broken line. For reference, the positions of the small flame port 22u, the lower main flame port 22f, and the upper main flame port 21f are also shown by a thick broken line (see also FIG. 5(b)). As shown in the figure, the flame detection flame port 27 (flame detection flame ports 27a, 27b) formed below the lower burner head 22 is formed at a position radially inward of the lower burner head 22 than the small flame port 22u shown by the broken line. In addition, the detection upper flame port 26 formed below the upper burner head 21 is formed at a position radially inward of the upper burner head 21 than the upper main flame port 21f shown by the broken line. Furthermore, between the flame detection flame port 27 (flame detection flame ports 27a, 27b) and the detection upper flame port 26, a protruding portion 29 is formed that protrudes radially outward from the flame detection flame port 27 and the detection upper flame port 26.

[0053] In this way, in the stove burner 10 of this embodiment, the flame detection flame port 27 (flame detection flame ports 27a, 27b) facing the flame sensor 32 is formed at a position radially inward of the burner head 20 from the small flame port 22u, and further, the detection upper flame port 26 formed above the flame detection flame port 27 is also formed at a position radially inward of the burner head 20 from the upper main flame port 21f. In this way, when the state in which fuel gas is burned only with the small flame port 22u (hereinafter, low firepower) is shifted to the state in which fuel gas is burned not only with the small flame port 22u but also with the upper main flame port 21f and the lower main flame port 22f (hereinafter, high firepower), it is possible to avoid a situation in which the flame sensor 32 cannot detect the flame and combustion is interrupted. The reason for this will be explained below.

[0054] 6 is an explanatory diagram showing the positional relationship between the flame formed in the flame detection port 27 and the flame sensor 32 in a conventional stove burner 10 (i.e., a stove burner 10 in which the upper main port 21f above the flame detection port 27 has not been moved radially inward of the burner head 20 relative to the other upper main port 21f). FIG. 6(a) shows a case in which no flame is formed in the upper main port 21f (i.e., a case in which a flame is formed only in the small port 22u and the flame detection port 27), and FIG. 6(b) shows a case in which a flame is also formed in the upper main port 21f (and the lower main port 22f).

[0055] In FIG. 6(a), the flame formed in the flame detection port 27 at the minimum firepower is shown by a solid line. As described above, the flame detection port 27 is formed at a position that is recessed radially inward of the burner head 20 relative to the other small flame ports 22u, so that the air required for combustion does not easily reach the position of the flame detection port 27. For this reason, as shown by the outlined arrow in the figure, the flame in the flame detection port 27 is formed at a position away from the flame detection port 27 (at a position outside the radial direction of the burner head 20) even at the minimum firepower. Also, the dashed line in the figure represents the flame formed in the flame detection port 27 when the firepower is increased within the range of small firepower (i.e., within the firepower range in which the fuel gas is burned only by the small flame port 22u and the flame detection port 27). As the firepower is increased, the flame formed in the flame detection port 27 becomes larger, but since the flame at the minimum firepower is formed at a position away from the flame detection port 27, the position of the flame does not move significantly even if the firepower is increased. Therefore, as shown in FIG. 6(a), even if the fire power is increased from the minimum fire power, the flame sensor 32 will be similarly heated by the flame from the flame detection flame port 27, and the flame can be detected stably.

[0056] FIG. 6(b) shows a state where the fire power is further increased and a flame is formed also in the upper main flame port 21f (and the lower main flame port 22f) (i.e., at the time of high fire power). In FIG. 6(b), the flame formed in the upper main flame port 21f is indicated by a dashed line. When a flame is formed also in the upper main flame port 21f, a large flame is formed just above the flame in the flame detection flame port 27, so there is a shortage of air required for combustion. For this reason, as shown by the black arrow in the figure, the flame in the flame detection flame port 27 moves to a position further away from the flame detection flame port 27 (a position on the radial outer side of the burner head 20) in search of air required for combustion. As a result, as shown in FIG. 6(b), the flame sensor 32 is burned by a low-temperature part of the flame in the flame detection flame port 27, called the inner flame, and the flame cannot be detected stably.

[0057] Fig. 7 is an explanatory diagram showing the positional relationship between the flame formed in the flame detection port 27 and the flame sensor 32 in the stove burner 10 of this embodiment. Fig. 7(a) shows the case where no flame is formed in the detection upper port 26 (i.e., low flame power), and Fig. 7(b) shows the case where a flame is formed in the detection upper port 26 as well (i.e., high flame power).

[0058] In FIG. 7(a), the flame formed in the flame detection port 27 at the minimum firepower is shown by a solid line, and the flame formed in the flame detection port 27 when the firepower is increased within the range of small firepower is shown by a broken line. In FIG. 7(a), a flame is not formed in the detection upper port 26, so it is exactly the same as FIG. 6(a) described above. That is, as shown by the white arrow in the figure, the flame formed in the flame detection port 27 at the minimum firepower is formed at a position away from the flame detection port 27 (a position outside the radial direction of the burner head 20). Therefore, even if the firepower is increased from the minimum firepower to within the range of small firepower, the flame sensor 32 is similarly scorched by the flame in the flame detection port 27, so that the flame can be detected stably.

[0059] FIG. 7(b) shows a state where a flame is also formed in the detection upper flame port 26 (i.e., at high firepower). The flame shown by the dashed line in the figure represents the flame formed in the detection upper flame port 26. As described above, the detection upper flame port 26 is formed at a position radially inward of the burner head 20 with respect to the upper main flame port 21f, so the flame formed in the detection upper flame port 26 is also formed radially inward from the flame of the upper main flame port 21f. Therefore, the position where the flame of the flame detection flame port 27 is formed is also formed radially inward compared to the conventional case described above using FIG. 6(b), and as a result, when a flame is formed in the detection upper flame port 26, the flame of the flame detection flame port 27 can be suppressed from moving radially outward. Therefore, in the stove burner 10 of this embodiment, even if a flame is formed in the detection upper flame port 26, the state in which the flame sensor 32 is roasted by the flame of the flame detection flame port 27 can be prevented from changing significantly, so that the flame can be detected stably.

[0060] In addition, in the stove burner 10 of this embodiment, a protruding portion 29 protruding radially outward is formed between the detection upper flame port 26 and the flame detection flame port 27, so that the flame formed in the detection upper flame port 26 and the flame formed in the flame detection flame port 27 are separated by the protruding portion 29 at the base of the flame. Therefore, the flame in the detection upper flame port 26 is guided so as not to extend downward, and the effect on the flame in the flame detection flame port 27 can be reduced. As a result, in the stove burner 10 of this embodiment, even if a flame is formed in the detection upper flame port 26, the state in which the flame sensor 32 is roasted by the flame in the flame detection flame port 27 does not change significantly, so that the flame can be detected stably.

[0061] In the above embodiment, the detection upper flame port 26 has been described as being formed at a position radially inward of the upper main flame port 21f of the burner head 20. However, instead of forming the detection upper flame port 26 at a position radially inward, the inclination of the bottom surface of the detection upper flame port 26 may be made greater than that of the upper main flame port 21f (i.e., the higher the bottom surface is at a radially outer position).

[0062] Fig. 8 is an explanatory diagram of such a modified stove burner 10. Fig. 8(a) shows a cross-sectional view of the modified stove burner 10 cut along a plane passing through the flame detection flame port 27a and the detection upper flame port 26. Fig. 8(b) shows the modified stove burner 10 in a state where flames are formed in the flame detection flame port 27 and the detection upper flame port 26 (i.e., at high heat).

[0063] As shown in Fig. 8(a), in the modified stove burner 10, the flame detection port 27 is formed at a position radially inward from the small port 22u, but the detection upper port 26 is not formed at a position inner. Instead, the detection upper port 26 has a sloped portion 26a formed at the radially outer portion of the bottom surface of the detection upper port 26, the sloped portion 26a being greater than the upper main port 21f. Note that, in Fig. 8(a), the sloped portion 26a is formed at the radially outer portion of the bottom surface of the detection upper port 26, but the entire bottom surface of the detection upper port 26 may be made into the sloped portion 26a, so that the slope is greater than that of the upper main port 21f (the bottom surface becomes higher as the position becomes radially outward).

[0064] In such a modified stove burner 10, the inclined portion 26a acts to make the flame formed in the detection upper flame port 26 extend more upward (i.e., move away from the flame in the flame detection flame port 27) than the flame formed in the upper main flame port 21f. Therefore, as shown in Fig. 8(b), even if a flame is formed in the detection upper flame port 26, the position of the flame in the flame detection flame port 27 can be prevented from moving, so that the flame sensor 32 can stably detect the flame in the flame detection flame port 27.

[0065] The stove burner 10 and gas stove 1 of this embodiment have been described above, but the present invention is not limited to the above embodiment and can be embodied in various forms without departing from the gist of the present invention.

[0066] For example, the stove burner 10 of the above embodiment is described as having a burner head 20 that can be divided 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 are 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.

[0067] In addition, the stove burner 10 of the present embodiment described above has been described 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. The main flame port groove may be formed in only one of the upper burner head 21 and the lower burner head 22, and the main flame port may be formed when the upper burner head 21 is placed on the lower burner head 22.

[0068] In addition, the stove burner 10 of the present embodiment described above has been described as having a small flame port groove 22c formed on the lower surface of the lower burner head 22 so that the small flame port 22u is formed between the burner body 11b and the lower burner head 22 when the lower burner head 22 is placed on the burner body 11b. However, a small flame port groove may be formed on the upper surface of the burner body 11b so that the small flame port is formed when the lower burner head 22 is placed on the burner body 11b.

[0069] Further, although the stove burner 10 of the above-described embodiment ignites the mixed gas by generating a spark from the ignition plug 30, it may also be possible to ignite the mixed gas by heating it using a heater.

[0070] Furthermore, the stove burner 10 of the above-mentioned embodiment is equipped with a circular 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 be equipped with, for example, a disk-shaped burner head in which the insertion hole 20h is blocked. [Explanation of symbols]

[0071] 1...Gas stove, 2...Main body case, 3...Tabletop, 4...Trivet, 5...Temperature sensor, 7...Grill door, 8...Stove operation button, 9...grill operation button, 10...cooker burner, 11...burner body, 11a... placement surface; 11b... burner body; 12... main mixing passage; 12o...open end, 13...child mixing passage, 13o...open end, 14...Central tube, 15...Partition tube, 15a...Mating surface, 16...Mixing chamber, 16c…Child mixing room, 16p…Parent mixing room, 20…Burner head, 20h...insertion hole, 21...upper burner head, 21a...upper cylindrical wall, 21b...upper main flame groove, 21f...upper main flame port, 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, 22u...small flame port, 26...detection upper flame port, 26L...detection upper flame port row, 26a... inclined portion, 27... flame detection flame port, 27L... flame detection flame port row, 27a...flame detection flame port, 27b...flame detection flame port, 28...ignition flame port, 29...protrusion; 30...spark plug; 31...spark plug visor; 31t...ignition target, 32...flame sensor, 40...gas supply pipe, 40c...connecting pipe, 40p...connecting pipe, 41...gas flow control valve, 42... opening and closing valve, 43c... gas injection nozzle, 43p... gas injection nozzle, 44c...nozzle hole, 44p...nozzle hole.

Claims

1. A stove burner comprising: a burner body to which a mixed gas of fuel gas and air is supplied; a burner head placed on the burner body and having a cylindrical outer peripheral side formed with a plurality of flame ports, and causing the mixed gas flowing in from the burner body to flow out from the plurality of flame ports; ignition means for igniting the mixed gas flowing out from some of the plurality of flame ports; and flame detection means provided at a position facing a flame port different from the flame port through which the mixed gas is ignited by the ignition means and for detecting a flame formed in the flame port facing the burner, The burner head includes: The plurality of flame ports include a plurality of first flame ports arranged in a circumferential direction of the outer circumferential side surface, and a plurality of second flame ports arranged in the circumferential direction at a position above the first flame ports, The distance between adjacent first flame ports is set to a distance that allows a flame formed in one of the first flame ports to spread to the other first flame port, and the distance between the first flame port and the second flame port above is set to a distance that allows a flame formed in the first flame port to spread to the second flame port above, the ignition means ignites the mixed gas flowing out from the first flame port, not from the second flame port; The flame detection means detects a flame formed in the first flame port, not in the second flame port, Among the plurality of first flame ports, a flame detection flame port at which the flame detection means detects a flame is formed at a position radially inward of the burner head relative to other first flame ports, Among the plurality of second flame ports, a detection upper flame port formed above the flame detection flame port is formed at a position radially inward of the burner head relative to the other second flame ports. A stove burner characterized by the above.

2. In the stove burner according to claim 1, The flame detection port has a plurality of adjacent flame detection ports forming a flame detection port row, The detection upper flame port includes a detection upper flame port row formed by a plurality of adjacent detection upper flame ports, The detection upper flame port row is formed wider in the circumferential direction of the outer circumferential side surface than the flame detection flame port. A stove burner characterized by the above.

3. In the stove burner according to claim 1 or 2, A protrusion protruding in a radial direction from the outer circumferential side surface is formed between a portion where the flame detection flame port is formed and a portion where the detection upper flame port is formed on the outer circumferential side surface. A stove burner characterized by the above.

4. In the burner according to any one of claims 1 to 3, The burner head includes: A lower burner head placed on the burner body; an upper burner head placed on the lower burner head; Equipped with The lower burner head is A cylindrical bottom wall protruding downward from an outer circumferential portion of a bottom surface and placed on the burner body; A cylindrical lower wall protruding upward from the outer periphery of the upper surface; 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 surface side cylindrical wall has a plurality of first flame port grooves formed on a lower end surface of the bottom surface side cylindrical wall and placed on the burner body to form the first flame port between the burner body and the bottom surface side cylindrical wall, the lower cylindrical wall has a plurality of lower second flame port grooves formed on an upper end surface of the lower cylindrical wall, and the upper burner head is placed thereon to form the second flame port between the upper burner head and the lower second flame port grooves, the upper cylindrical wall has a plurality of upper second flame port grooves formed on a lower end surface of the upper cylindrical wall, the upper cylindrical wall being placed on the lower burner head to form the second flame port between the upper cylindrical wall and the lower burner head; It has The upper second flame grooves of the upper burner head are formed at positions alternately arranged in the circumferential direction of the outer circumferential side surface with respect to the lower second flame grooves of the lower burner head. A stove burner characterized by the above.

5. The burner according to claim 4, The height of the first flame port groove that forms the flame detection flame port when the lower burner head is placed on the burner body is set to a dimension larger than the heights of the other first flame port grooves, The sum of the heights of the lower second flame port groove and the upper second flame port groove, which form the detection upper flame port when the upper burner head is placed on the lower burner head, is set to a value smaller than the sum of the heights of the other lower second flame port grooves and the upper second flame port grooves. A stove burner characterized by the above.

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

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