Gas burner and heating cooker equipped with the same

Abstract

To inhibit resonance sound occurring from flame in a gas burner in which a plurality of flame holes are open in a circumferential direction of an outer peripheral surface of a flame hole forming member which can be divided vertically.SOLUTION: In a gas burner, a plurality of first grooves 21e are provided recessed on the upper end side of a first annular wall 21d at a first forming member 21 located at the lower side of a flame hole forming member 20 and each space between the adjacent first grooves is formed as a first protruding part 21k. On the other hand, a plurality of second grooves 22b are provided recessed on the lower end side of a second annular wall 22a at a second forming member 22 located at the upper side and each space between the adjacent second grooves is formed as a second protruding part 22k. The gas burner is provided with: divided portions in each of which a first flame hole 20Ua, defined by the first groove and a lower end of the second protruding part when the first protruding part and the second protruding part come into contact with each other in a state that the second forming member is placed on the first forming member in a manner that these forming members are offset from each other in a circumferential direction so as to prevent the first grooves and the second grooves from overlapping with each other, is divided from a second flame hole 20Ub defined by the second groove and an upper end of the first protruding part; and connection portions in each of which the first protruding part and the second protruding part are not in contact with each other to form a gap G therebetween to allow the first flame hole and the second flame hole to be connected through the gap.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a gas burner in which a lower first flame port and an upper second flame port are alternately opened in the circumferential direction on the outer surface of a flame port-forming member that can be separated into upper and lower parts, and to a cooking device equipped with said gas burner. [Background technology]

[0002] Gas burners, which have a plurality of flame ports open in the circumferential direction on the outer peripheral surface of a flame port-forming member and eject a mixture of fuel gas and air from the flame ports for combustion, are widely used and mounted on cooking appliances such as gas stoves. In order to improve the workability of the flame port-forming member for such gas burners, it has been proposed to configure the flame port-forming member to be separable into upper and lower parts (for example, Patent Document 1).

[0003] The first forming member below the flame port forming member has a first annular wall extending from the outer edge portion upward in an annular shape, and a plurality of first radial grooves are recessed at a predetermined interval in the circumferential direction on the upper end side of the first annular wall, so that the space between adjacent first grooves forms a first convex portion that is upwardly convex. On the other hand, the second forming member above the flame port forming member has a second annular wall extending from the outer edge portion downward in an annular shape, and a plurality of second radial grooves are recessed at a predetermined interval in the circumferential direction on the lower end side of the second annular wall, so that the space between adjacent second grooves forms a second convex portion that is downwardly convex. In a state where the second forming member is placed on the first forming member with the first groove and the second groove shifted in the circumferential direction so that they do not overlap, the first convex portion and the second convex portion come into contact with each other, so that the first flame port defined by the first groove and the lower end of the second convex portion opens on the outer circumferential surface of the first annular wall, and the second flame port defined by the second groove and the upper end of the first convex portion opens on the outer circumferential surface of the second annular wall. In other words, the first flame port and the second flame port are alternately arranged in the circumferential direction on the outer circumferential surface of the flame port forming member in a separated state. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-143959 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in a conventional gas burner in which the first flame port on the lower side and the second flame port on the upper side are alternately opened in the circumferential direction of the outer peripheral surface of the flame port-forming member as described above, there was a problem that an unpleasant sound may be generated during combustion when the flow rate of the mixed gas supplied to the flame port-forming member increases. This sound is generated as follows. First, when the flow rate of the mixed gas ejected from the flame port increases, the flame formed outside the flame port is more likely to oscillate, and the smaller the flame, the more likely it is to oscillate. Then, when relatively small similar flames are arranged close to each other in the circumferential direction of the outer peripheral surface of the flame port-forming member, the flames may resonate with each other, causing a resonant sound to be generated from the flames.

[0006] This invention has been made in response to the above-mentioned problems in the conventional technology, and aims to provide a technology that is capable of suppressing resonant noise generated from the flame as mixed gas is burned in a gas burner in which a lower first flame port and an upper second flame port are opened alternately in the circumferential direction on the outer surface of a flame port forming member that can be separated into upper and lower parts. [Means for solving the problem]

[0007] In order to solve the above problems, the gas burner of the present invention adopts the following configuration. A gas burner having a plurality of flame ports opening in a circumferential direction on an outer peripheral surface of a flame port forming member which can be separated into upper and lower portions, and ejecting a mixture of fuel gas and air from the flame ports for combustion, The first forming member below the flame port forming member has a first annular wall that is erected in an annular shape from an outer edge portion toward the upper side, and a plurality of first grooves in the radial direction are recessed at a predetermined interval in the circumferential direction on the upper end side of the first annular wall, and the space between adjacent first grooves forms a first convex portion that is convex upward, The second forming member on the upper side of the flame port forming member has a second annular wall that is annularly hung downward from an outer edge portion, and a plurality of radial second grooves are recessed at a predetermined interval in the circumferential direction on the lower end side of the second annular wall, and a second convex portion that is convex downward is formed between adjacent second grooves, The first groove of the first annular wall and the second groove of the second annular wall are shifted in the circumferential direction so as not to overlap with each other, and the second forming member is placed on the first forming member. In this state, the outer circumferential surface of the flame port forming member is a dividing portion where the first convex portion and the second convex portion come into contact with each other to divide a first flame port defined by the first groove and the lower end of the second convex portion and a second flame port defined by the second groove and the upper end of the first convex portion; The first protrusion and the second protrusion are not in contact with each other and have a gap therebetween, so that the first flame port and the second flame port are connected to each other via the gap at a connection portion. The present invention is characterized in that:

[0008] In the gas burner of the present invention, at the separation points, relatively small flames (separate flames) are formed individually at each of the first and second flame ports, whereas at the connection points, the first and second flame ports are connected via a gap, so that a flame (connected flame) is formed that connects from the first flame port to the second flame port. This connected flame is larger than the separated flame, so it is less likely to oscillate even if the flow rate of the mixed gas increases. Furthermore, since not only separated flames are connected in the circumferential direction of the outer circumferential surface of the flame port forming member, but also a connecting flame is included, resonance between the separated flames is prevented, so that it is possible to suppress the resonant sound generated from the flame accompanying the combustion of the mixed gas.

[0009] In the gas burner of the present invention described above, the separated portions and the connected portions may be arranged alternately in the circumferential direction of the outer circumferential surface of the flame port forming member.

[0010] In a gas burner configured in this manner, the separating points and connecting points are arranged alternately, so that the resonance between the separating flames is more easily blocked by the presence of the connecting flame than in a case where the separating points and connecting points are arranged randomly, thereby effectively suppressing the generation of resonant noise from the flame accompanying the combustion of the mixed gas.

[0011] In the gas burner of the present invention described above, a connecting region in which a plurality of connecting points are arranged continuously may be provided on the outer circumferential surface of the flame port forming member.

[0012] In the connecting region of the gas burner having such a configuration, a connecting flame that is connected from the first flame port to the second flame port is mainly formed, and the possibility of the divided flames being formed close to each other is low, so that the generation of resonance noise caused by the resonance between the divided flames can be suppressed. Therefore, by providing such a connecting region on a part of the outer circumferential surface of the flame port forming member, it is possible to reduce the resonance noise generated by the gas burner as a whole compared to the case where the connecting region is not provided.

[0013] The gas burner of the present invention may be mounted on a cooking device, and a cooking vessel may be heated by combustion in the gas burner.

[0014] In such a cooking device, it is possible to suppress the resonant noise generated from the flame associated with the combustion of the mixed gas in the installed gas burner, thereby ensuring the quietness of the cooking device. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view showing the appearance of a gas stove 1 as an example of a cooking device equipped with a gas burner 10 of the present embodiment. [Diagram 2] 1 is a perspective view showing the general shape of a gas burner 10 of the present embodiment. [Diagram 3] FIG. 2 is a perspective view showing an exploded state of the upper part of the gas burner 10 of the present embodiment. [Figure 4]1 is a vertical cross-sectional view showing the internal structure of a gas burner 10 of the present embodiment. [Diagram 5] 1 is an explanatory diagram showing an enlarged view of the outer peripheral surface of a burner cap 20 in a gas burner 10 in which unpleasant noise may be generated during combustion of a mixed gas. [Figure 6] 2 is an explanatory diagram showing an enlarged view of the outer circumferential surface of the burner cap 20 in the gas burner 10 of the first embodiment. FIG. [Figure 7] 2 is an explanatory diagram showing an enlarged view of the outer circumferential surface of a burner cap 20 in a gas burner 10 as a modified example of the first embodiment. FIG. [Figure 8] 10 is an explanatory diagram showing an enlarged view of a divided flame port region on the outer circumferential surface of a burner cap 20 in a gas burner 10 of a second embodiment. FIG. [Figure 9] 10 is an explanatory diagram showing an enlarged view of a connecting flame port region on the outer circumferential surface of a burner cap 20 in a gas burner 10 of a second embodiment. FIG. [Figure 10] 10 is an explanatory diagram showing the arrangement of the divided flame port areas and the connected flame port areas in a burner cap 20 of a gas burner 10 of a second embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] 1 is a perspective view showing the appearance of a gas stove 1 as an example of a cooking device equipped with a gas burner 10 of this embodiment. The illustrated gas stove 1 comprises a shallow box-shaped stove body 2 with an open top, and a top plate 3 placed on the stove body 2 and covering the top surface of the stove body 2. Two gas burners 10 are installed on the left and right of the stove body 2, and the tops of the gas burners 10 protrude from insertion holes formed in the top plate 3.

[0017] A trivet 4 is provided on the top plate 3 above the gas burner 10 for placing cooking vessels such as pots. As shown in the figure, the trivet 4 has a plurality of (six in this embodiment) claws 4b radially supported by an annular frame 4a that surrounds the gas burner 10 and is placed on the top plate 3. A cooking vessel is placed on the top surface of these claws 4b, and the cooking vessel is heated by burning a mixture of fuel gas and air with the gas burner 10. In addition, on the front side of the top plate 3, there are provided operation knobs 5 that correspond to each of the two gas burners 10 and are operated by the user when igniting, extinguishing, or adjusting the flame power. When the operation knob 5 is pressed down and rotated from the initial position in a predetermined direction (counterclockwise in this embodiment), fuel gas is supplied to the gas burner 10 and the gas burner 10 is ignited by an ignition plug, which will be described later. Thereafter, by changing the rotation angle of the operating knob 5, the amount of fuel gas supplied is changed, thereby adjusting the flame power of the gas burner 10, and by returning the operating knob 5 to its initial position, the supply of fuel gas to the gas burner 10 is stopped, resulting in extinguishing.

[0018] 2 is a perspective view showing the general shape of the gas burner 10 of this embodiment. As shown in the figure, the gas burner 10 has a structure in which a substantially cylindrical burner cap 20 is placed on a substantially cylindrical burner body 11. Two mixing tubes, one large and one small (a large mixing tube 12 and a small mixing tube 13), are connected to the burner body 11, and the burner body 11 and the two mixing tubes 12 and 13 of this embodiment are formed by sheet metal processing using thin plates such as stainless steel. As described later, a mixed gas of fuel gas and air is supplied to the burner body 11 through the mixing tubes 12 and 13.

[0019] On the other hand, the burner cap 20 of this embodiment is formed by die casting using aluminum alloy, brass, or the like. As shown enlarged in FIG. 2, a plurality of flame ports 20U, 20L are opened on the outer peripheral surface of the burner cap 20 placed on the burner body 11, arranged in two upper and lower stages. Of these, the upper stage flame ports 20U are composed of two types, upper and lower, as will be described in detail later, and the lower first upper stage flame port 20Ua and the upper second upper stage flame port 20Ub are arranged alternately in the circumferential direction of the outer peripheral surface of the burner cap 20. The burner cap 20 of this embodiment corresponds to the "flame port forming member" of the present invention.

[0020] A gas pipe 40 that introduces fuel gas to the gas burner 10 is provided with a main valve 41 that opens and closes the gas pipe 40, and the gas pipe 40 branches into two downstream of the main valve 41, and flow rate control valves 42a, 42b that adjust the flow rate of the fuel gas are provided on each of the branch pipes 40a, 40b. The main valve 41 is electrically connected to a control unit (not shown), and opening and closing is controlled by the control unit. Meanwhile, the flow rate control valves 42a, 42b are connected to an operation knob 5 on the top plate 3 via a shaft (not shown), and the flow rate of the fuel gas can be changed according to the rotation of the operation knob 5.

[0021] When fuel gas is injected toward the open end 12o of the large mixing tube 12 from a nozzle (not shown) connected to the end of the branch pipe 40a, the surrounding air is sucked in by the ejector effect while the fuel gas flows into the large mixing tube 12, and the mixed gas of fuel gas and air that has passed through the large mixing tube 12 is supplied to the burner body 11. Similarly, when fuel gas is injected toward the open end 13o of the small mixing tube 13 from a nozzle (not shown) connected to the end of the branch pipe 40b, the fuel gas flows into the small mixing tube 13 while sucking in the surrounding air, and the mixed gas of fuel gas and air that has passed through the small mixing tube 13 is supplied to the burner body 11.

[0022] The gas burner 10 of this embodiment is a so-called parent-child burner, and as will be described in detail later, the multiple upper flame ports 20U (first upper flame port 20Ua and second upper flame port 20Ub) are supplied with mixed gas from the large mixing tube 12, while the multiple lower flame ports 20L on the lower side are supplied with mixed gas from the small mixing tube 13. As shown in the figure, an ignition plug 30 is installed close to the outer circumferential surface of the burner body 11, and a hood part 31 extending from the outer circumferential surface of the burner cap 20 covers the upper part of the ignition plug 30. Spark discharge from this ignition plug 30 toward the burner cap 20 starts the combustion of the mixed gas ejected from the lower flame port 20L. In addition, a flame sensor 32 consisting of a thermocouple is installed at a position adjacent to the ignition plug 30, making it possible to detect the flame of the lower flame port 20L. This flame sensor 32 is electrically connected to the above-mentioned control unit.

[0023] In the gas burner 10 of this embodiment, the flow rate control valves 42a and 42b can be used to switch between a state in which the mixed gas is supplied to the lower flame port 20L but not to the upper flame port 20U, and a state in which the mixed gas is supplied to the upper flame port 20U in addition to the lower flame port 20L. The lower flame port 20L has a smaller opening area than the upper flame port 20U, and the amount of mixed gas ejected (supply flow rate) is smaller. Therefore, if the fire power required by the gas burner 10 is small, the mixed gas can be burned only by the lower flame port 20L, and if the fire power required is large, the mixed gas can be burned by both the lower flame port 20L and the upper flame port 20U. At that time, the flame from the lower flame port 20L spreads, and the mixed gas ejected from the upper flame port 20U starts to burn. Furthermore, as shown in the figure, the upper flame port 20U does not open at a position on the outer surface of the burner cap 20 that faces the multiple claw portions 4b of the trivet 4 described above, thereby preventing the claw portions 4b from being burned by the flame from the upper flame port 20U.

[0024] 3 is a perspective view showing the state in which the upper part of the gas burner 10 of this embodiment is disassembled. As shown in the figure, the burner body 11, which is substantially cylindrical, has an upper end side bent inwardly and has an annular mounting surface 11a on which the burner cap 20 is mounted. The upper part of the burner body 11 protrudes from the insertion hole of the top plate 3 when the gas burner 10 is installed on the stove main body 2. In addition, a substantially cylindrical central cylinder 14 is erected inside the burner body 11, and an annular mixing chamber 16 to which mixed gas is supplied is formed between the burner body 11 and the central cylinder 14.

[0025] Furthermore, a partition cylinder 15 having a substantially cylindrical shape is provided between the burner body 11 and the central cylinder 14. This divides the mixing chamber 16 into an inner mixing chamber 16a located inside the partition cylinder 15 (i.e., between the partition cylinder 15 and the central cylinder 14) and an outer mixing chamber 16b located outside the partition cylinder 15 (i.e., between the burner body 11 and the partition cylinder 15). Of these, the inner mixing chamber 16a is supplied with the mixed gas that has passed through the large mixing tube 12 described above, and the outer mixing chamber 16b is supplied with the mixed gas that has passed through the small mixing tube 13 described above. The partition cylinder 15 is formed by sheet metal processing in the same manner as the burner body 11, and has an upper end side bent inward and an inner side bent downward, and is provided with a short cylindrical fitting surface 15a.

[0026] The burner cap 20 of this embodiment is configured to be separable into two parts, upper and lower, in order to improve workability. The lower first cap member 21 is placed on the burner body 11, and the upper second cap member 22 is placed on the first cap member 21. As shown in the figure, a cylindrical partition tube 21a is suspended downward from the inner edge portion of the annular first cap member 21. A shallow annular lower annular wall 21b is suspended downward from the outer edge portion of the first cap member 21, and a plurality of radial lower grooves 21c are recessed in the circumferential direction on the lower end side of the lower annular wall 21b. When the first cap member 21 is placed on the burner body 11, the partition tube 21a is fitted inside the fitting surface 15a of the partition cylinder 15, and the lower end of the lower annular wall 21b of the first cap member 21 is abutted against the mounting surface 11a of the burner body 11. The first cap member 21 of this embodiment corresponds to the "first forming member" of the present invention, and the second cap member 22 of this embodiment corresponds to the "second forming member" of the present invention.

[0027] The first cap member 21 has a first annular wall 21d that is erected in an annular shape from the outer edge portion upward, and a plurality of first radial grooves 21e are recessed at a predetermined interval in the circumferential direction on the upper end side of the first annular wall 21d. Note that the first grooves 21e are not provided in the first annular wall 21d at positions facing the plurality of claws 4b of the trivet 4.

[0028] On the other hand, the circular second cap member 22 has a second annular wall 22a that is hung from the outer edge portion downward in an annular shape, and a plurality of radial second grooves 22b are recessed at a predetermined interval in the circumferential direction on the lower end side of the second annular wall 22a. In addition, the above-mentioned eaves portion 31 that covers the upper part of the ignition plug 30 is provided protruding from the outer circumferential surface of the second annular wall 22a. Note that, like the above-mentioned first groove 21e, the second groove 22b is not provided in the second annular wall 22a at a position facing the multiple claw portions 4b of the trivet 4. In the burner cap 20 of this embodiment, when the second cap member 22 is placed on the first cap member 21, the upper end of the first annular wall 21d and the lower end of the second annular wall 22a are aligned in a state in which the first groove 21e and the second groove 22b are shifted in the circumferential direction so as not to overlap.

[0029] 4 is a vertical cross-sectional view showing the internal structure of the gas burner 10 of this embodiment. As described above, an annular mixing chamber 16 is provided between the burner body 11 and the central cylinder 14, and is divided into an inner mixing chamber 16a and an outer mixing chamber 16b by the partition cylinder 15. When the first cap member 21 is placed on the burner body 11, the partition cylinder 21a is fitted to the inside of the fitting surface 15a of the partition cylinder 15, and the lower end of the lower annular wall 21b of the first cap member 21 abuts against the mounting surface 11a, and the lower flame port 20L formed by the lower groove 21c and the mounting surface 11a opens on the outer circumferential surface of the lower annular wall 21b. In the cross-sectional view of Figure 4, the right-side lower annular wall 21b of the first cap member 21 represents a cross section cut at a position where the lower groove 21c is not present, and the right-side lower annular wall 21b represents a cross section cut at the position of the lower groove 21c (lower flame port 20L).

[0030] The lower flame port 20L communicates with the outer mixing chamber 16b, and the mixed gas supplied through the small mixing tube 13 is ejected from the lower flame port 20L, and combustion of the mixed gas is initiated by spark discharge from the ignition plug 30. The flame sensor 32 of this embodiment is disposed so as to be able to detect the flame of the lower flame port 20L.

[0031] 4, a cylindrical fitting tube 22d hangs down from the underside of second cap member 22, and when second cap member 22 is placed on first cap member 21, fitting tube 22d fits into the inside of the upper part of central cylinder 14. The lower end side of central cylinder 14 is airtightly joined to the periphery of through hole 17h formed in bottom plate 17 made of sheet metal.

[0032] The second cap member 22 is placed on the first cap member 21 with a circumferential shift so that the first groove 21e of the first annular wall 21d and the second groove 22b of the second annular wall 22a do not overlap. As a result, the first upper stage flame port 20Ua defined by the first groove 21e and the lower end of the second annular wall 22a opens on the outer circumferential surface of the first annular wall 21d, and the second upper stage flame port 20Ub defined by the second groove 22b and the upper end of the first annular wall 21d opens on the outer circumferential surface of the second annular wall 22a. In the cross-sectional view of FIG. 4, the first annular wall 21d and the second annular wall 22a on the right side represent a cross section cut at the position of the first groove 21e (first upper stage flame port 20Ua), and the first annular wall 21d and the second annular wall 22a on the left side represent a cross section cut at the position of the second groove 22b (second upper stage flame port 20Ub). The first upper flame port 20Ua of this embodiment corresponds to the "first flame port" of the present invention, and the second upper flame port 20Ub of this embodiment corresponds to the "second flame port" of the present invention.

[0033] The first upper stage flame nozzle 20Ua and the second upper stage flame nozzle 20Ub are connected to the internal mixing chamber 16a, and the mixed gas supplied through the large mixing tube 12 described above is ejected from the first upper stage flame nozzle 20Ua and the second upper stage flame nozzle 20Ub, and combustion of the mixed gas begins as the flame spreads from the flame in the lower stage flame nozzle 20L.

[0034] In this way, in the gas burner 10 in which the first upper-stage flame port 20Ua and the second upper-stage flame port 20Ub are opened as the upper-stage flame port 20U on the outer peripheral surface of the burner cap 20, an unpleasant sound may be generated due to the combustion of the mixed gas ejected from the first upper-stage flame port 20Ua and the second upper-stage flame port 20Ub. In the following, the configuration adopted in the gas burner 10 of this embodiment in order to suppress such a sound will be explained, but as a preparation for this, the reason why an unpleasant sound is generated due to the combustion of the mixed gas will first be explained.

[0035] 5 is an explanatory diagram showing an enlarged view of the outer circumferential surface of the burner cap 20 in the gas burner 10 in which an unpleasant sound may be generated due to the combustion of the mixed gas. In the figure, the outer circumferential surfaces of the first annular wall 21d of the first cap member 21 and the second annular wall 22a of the second cap member 22 are hatched. As shown in the figure, the space between adjacent first grooves 21e of the first annular wall 21d is an upwardly convex first convex portion 21k, and the space between adjacent second grooves 22b of the second annular wall 22a is a downwardly convex second convex portion 22k. Furthermore, the width of the first convex portion 21k in the circumferential direction of the burner cap 20 (left and right direction in the figure) is wider than the width of the second groove 22b, and the width of the second convex portion 22k is wider than the width of the first groove 21e, so that a circumferential overlapping margin is provided between the first convex portion 21k and the second convex portion 22k, with the first groove 21e and the second groove 22b being shifted circumferentially so as not to overlap.

[0036] Then, by the contact between the first convex portion 21k and the second convex portion 22k, the first groove 21e and the lower end of the second convex portion 22k define the first upper stage flame port 20Ua, and the second groove 22b and the upper end of the first convex portion 21k define the second upper stage flame port 20Ub. Therefore, the first upper stage flame port 20Ua and the second upper stage flame port 20Ub are alternately opened in the circumferential direction in a divided state on the outer peripheral surface of the burner cap 20. Note that, on the outer peripheral surface of the burner cap 20, neither the first upper stage flame port 20Ua nor the second upper stage flame port 20Ub is opened at a position facing the multiple claw portions 4b of the trivet 4 described above. In the following, the area where neither the first upper stage flame port 20Ua nor the second upper stage flame port 20Ub is open for more than a predetermined distance is referred to as the "non-flame port area", and the area where the first upper stage flame port 20Ua and the second upper stage flame port 20Ub are open alternately in the circumferential direction is referred to as the "flame port area".

[0037] As described above, the upper flame nozzle 20U (the first upper flame nozzle 20Ua and the second upper flame nozzle 20Ub) receives the mixed gas through the large mixing tube 12, and therefore receives a larger flow rate of the mixed gas than the lower flame nozzle 20L, which receives the mixed gas through the small mixing tube 13. In general, when the flow rate of the mixed gas ejected from the flame nozzle increases, the flame formed outside the flame nozzle is more likely to oscillate, and the smaller the flame, the more likely it is to oscillate. If the first upper flame nozzle 20Ua and the second upper flame nozzle 20Ub are alternately opened in the circumferential direction in the flame nozzle region on the outer circumferential surface of the burner cap 20 as shown in FIG. 5, the relatively small similar flames formed individually at each of the flame nozzles 20Ua and 20Ub are closely connected, and the flames resonate with each other, causing a resonant sound to be generated from the flame. Therefore, in the gas burner 10 of this embodiment, the following configuration is adopted in order to suppress the resonant sound generated from the flame accompanying the combustion of the mixed gas.

[0038] FIG. 6 is an explanatory diagram showing an enlarged outer peripheral surface of the burner cap 20 in the gas burner 10 of the first embodiment. In the figure, the outer peripheral surfaces of the first annular wall 21d and the second annular wall 22a are hatched. As shown in the figure, the second annular wall 22a of the second cap member 22 of the first embodiment is provided with a shortened second convex portion 22ks, which is a portion of the multiple second convex portions 22k that has been shortened in length. This shortened second convex portion 22ks is not in contact with the first convex portion 21k, and there is a gap G between the shortened second convex portion 22ks and the first convex portion 21k. As a result, a connected upper-stage flame port 20Uc is formed in which two second upper-stage flame ports 20Ub on both sides of the shortened second convex portion 22ks and one first upper-stage flame port 20Ua facing the shortened second convex portion 22ks are connected via the gap G.

[0039] Similarly, a shortened first protrusion 21ks, which is a shortened portion of the multiple first protrusions 21k, is provided on the first annular wall 21d of the first cap member 21. This shortened first protrusion 21ks is not in contact with the second protrusion 22k, and a gap G is formed between the shortened first protrusion 21ks and the second protrusion 22k. As a result, a connected upper-stage flame port 20Uc is formed in which two first upper-stage flame ports 20Ua on both sides of the shortened first protrusion 21ks and one second upper-stage flame port 20Ub facing the shortened first protrusion 21ks are connected via the gap G.

[0040] In this way, the flame (connected flame) formed at the connected upper flame port 20Uc where the first upper flame port 20Ua and the second upper flame port 20Ub are connected via the gap G is larger than the flame (segmented flame) formed individually at each of the first upper flame port 20Ua and the second upper flame port 20Ub, and is therefore less likely to oscillate even when the flow rate of the mixed gas increases. Furthermore, since not only the segmented flames are connected in the circumferential direction in the flame port region on the outer circumferential surface of the burner cap 20 but also the connected flame is included, resonance between the segmented flames is prevented, making it possible to suppress the resonant sound generated from the flame as the mixed gas burns.

[0041] In particular, as shown in Fig. 6, in the flame port region of the burner cap 20 of the first embodiment, the first upper flame port 20Ua and the second upper flame port 20Ub are separated by the contact between the first convex portion 21k and the second convex portion 22k, and the connecting portion (connecting upper flame port 20Uc) where the first upper flame port 20Ua and the second upper flame port 20Ub are connected via the gap G by the provision of the shortened first convex portion 21ks or the shortened second convex portion 22ks are alternately arranged in the circumferential direction. In this way, the resonance between the divided flames is more easily blocked by the presence of the connecting flame than when the dividing portions and the connecting portions are randomly arranged, so that the generation of resonance sound from the flame accompanying the combustion of the mixed gas can be effectively suppressed.

[0042] Furthermore, the spacing of the gap G needs to be greater than or equal to the spacing (e.g., 0.3 mm) at which the mixed gas is ejected from the gap G to form a flame on the outside, i.e., the spacing at which a connected flame is formed extending from the first upper flame port 20Ua to the second upper flame port 20Ub, and it is desirable for the spacing to be narrower than the circumferential width (e.g., 1.0 mm) of the first groove 21e and the second groove 22b.

[0043] In the example of Fig. 6, the shortened first convex portion 21ks or the shortened second convex portion 22ks is provided to secure the gap G, but the present invention is not limited to this, and the gas burner 10 of the first embodiment may have the following modified examples. Fig. 7 is an explanatory diagram showing an enlarged outer circumferential surface of the burner cap 20 in the gas burner 10 as a modified example of the first embodiment. In the figure, the outer circumferential surfaces of the first annular wall 21d and the second annular wall 22a are hatched.

[0044] As shown in the drawings, a first C-chamfered portion 21m is provided by so-called C-chamfering on a portion of the first protrusions 21k on the first annular wall 21d of the first cap member 21 of the modified example between one side surface (the right side surface in the illustrated example) and the upper end surface of the first protrusions 21k. On the other hand, a second C-chamfered portion 22m is provided by so-called C-chamfering on a portion of the second protrusions 22k on the second annular wall 22a of the second cap member 22 between one side surface (the left side surface in the illustrated example) and the lower end surface of the second protrusions 22k.

[0045] Such first C chamfered portion 21m and second C chamfered portion 22m are arranged to face each other, are not in contact with each other, and have a gap G therebetween. This forms a connected upper stage flame port 20Uc in which a first upper stage flame port 20Ua adjacent to first C chamfered portion 21m and a second upper stage flame port 20Ub adjacent to second C chamfered portion 22m are connected via the gap G.

[0046] 7, a first C chamfered portion 21m is provided on every other one of the multiple first protrusions 21k on the first annular wall 21d, and a second C chamfered portion 22m is provided on every other one of the multiple second protrusions 22k on the second annular wall 22a. As a result, in the flame port region on the outer circumferential surface of the burner cap 20, separation points where the first upper-stage flame port 20Ua and the second upper-stage flame port 20Ub are separated and connection points (connected upper-stage flame port 20Uc) where the first upper-stage flame port 20Ua and the second upper-stage flame port 20Ub are connected via a gap G are alternately arranged in the circumferential direction.

[0047] In this modified gas burner 10, as in the first embodiment described above, the resonance between the divided flames formed individually in each of the first upper flame port 20Ua and the second upper flame port 20Ub is blocked by the presence of the connected flame formed in the connected upper flame port 20Uc, thereby suppressing the resonant sound generated from the flame as the mixed gas is burned.

[0048] In the gas burner 10 of the first embodiment and the modified example described above, one flame port region includes a separation portion where the first upper-stage flame port 20Ua and the second upper-stage flame port 20Ub are separated, and a connection portion (connected upper-stage flame port 20Uc) where the first upper-stage flame port 20Ua and the second upper-stage flame port 20Ub are connected via a gap G. In contrast, in the gas burner 10 of the second embodiment described below, the flame port region is divided into a flame port region where the separation portions are continuous and no connection portions exist (hereinafter, separated flame port region) and a flame port region where the connection portions are continuous and no separation portions exist (hereinafter, connected flame port region).

[0049] First, Fig. 8 is an explanatory diagram showing an enlarged view of the divided flame port region on the outer circumferential surface of the burner cap 20 in the gas burner 10 of the second embodiment. Fig. 8(a) shows a state in which the second cap member 22 is placed on the first cap member 21, and Fig. 8(b) shows a state in which the second cap member 22 is separated from the first cap member 21. In the figure, the outer circumferential surfaces of the first annular wall 21d and the second annular wall 22a are each shown with hatching.

[0050] In the gas burner 10 of the second embodiment, as shown in Fig. 8(b), the upper end of the first protrusion 21k in the divided flame port region of the first cap member 21 is located above the upper end of the first annular wall 21d in the non-flame port region. Also, the lower end of the second protrusion 22k in the divided flame port region of the second cap member 22 is located below the lower end of the second annular wall 22a in the non-flame port region.

[0051] In addition, the width of the first protrusion 21k in the circumferential direction of the burner cap 20 (left and right direction in the figure) is wider than the width of the second groove 22b, and the first protrusion 21k is provided with a so-called R-chamfering between both side surfaces and the upper end surface by a first R-chamfering process 21n. Similarly, the width of the second protrusion 22k is wider than the width of the first groove 21e, and the second protrusion 22k is provided with a second R-chamfering between both side surfaces and the lower end surface by a R-chamfering process.

[0052] 8(a), when the second cap member 22 is placed on the first cap member 21, the upper end of the first annular wall 21d and the lower end of the second annular wall 22a are in contact with each other in the non-flame port region, and the first R chamfered portion 21n of the first convex portion 21k and the second R chamfered portion 22n of the second convex portion 22k are in contact with each other in the divided flame port region. As a result, the upper end of the first convex portion 21k enters the second groove 22b, and the lower end of the second convex portion 22k enters the first groove 21e, so that the upper end of the first convex portion 21k is positioned higher than the lower end of the second convex portion 22k.

[0053] In the divided flame port region on the outer peripheral surface of the burner cap 20 in the gas burner 10 of the second embodiment, the upper end side of the first convex portion 21k and the lower end side of the second convex portion 22k overlap in the vertical direction, so that a vertical interval H can be secured between the upper end of the first upper-stage flame port 20Ua and the lower end of the second upper-stage flame port 20Ub. As a result, compared to the case where the upper end of the first convex portion 21k and the lower end of the second convex portion 22k are located on the same plane (see FIG. 5), it is possible to suppress interference between the flame of the first upper-stage flame port 20Ua and the flame of the second upper-stage flame port 20Ub, thereby stabilizing combustion, and to increase the heating efficiency of the cooking vessel by the flame of the second upper-stage flame port 20Ub adjacent to the cooking vessel placed above the gas burner 10. However, in the segmented flame port region, relatively small similar flames (segmented flames) formed individually in each of the first upper flame port 20Ua and the second upper flame port 20Ub are closely spaced and connected together, so that as described above, the segmented flames resonate with each other, easily generating resonance noise.

[0054] On the other hand, Fig. 9 is an explanatory diagram showing an enlarged view of the connecting flame port region on the outer circumferential surface of the burner cap 20 in the gas burner 10 of the second embodiment. In the figure, the outer circumferential surfaces of the first annular wall 21d and the second annular wall 22a are hatched. As shown in the figure, the upper end of the first convex portion 21k in the connecting flame port region of the first cap member 21 is located above the upper end of the first annular wall 21d in the non-flame port region, as in the divided flame port region described above, but the lower end of the second convex portion 22k in the connecting flame port region of the second cap member 22 is located above the lower end of the second annular wall 22a in the non-flame port region. That is, the second convex portions 22k in the connecting flame port region are all shortened second convex portions 22ks. For this reason, even when the second cap member 22 is placed on the first cap member 21, the shortened second convex portion 22ks does not come into contact with the first convex portion 21k, and a gap G is formed between the shortened second convex portion 22ks and the first convex portion 21k. Therefore, in the connecting flame port region, the first upper stage flame port 20Ua and the second upper stage flame port 20Ub are both connected via the gap G, and the connecting portion (connecting upper stage flame port 20Uc) is continuous. The connecting flame port region of the second embodiment corresponds to the "connecting region" of the present application.

[0055] In such a connected flame port region, there is a tendency for a connected flame to be formed that extends from the first upper flame port 20Ua to the second upper flame port 20Ub, and since there is a low possibility that individual segmented flames will be formed in the first upper flame port 20Ua or the second upper flame port 20Ub and multiple segmented flames will come close to each other, it is possible to suppress the generation of resonant noise caused by resonance between the segmented flames.

[0056] In the example shown in FIG. 9, the second convex portion 22k is shortened to form the shortened second convex portion 22ks in order to provide the gap G in the connected flame port region, but the first convex portion 21k may be shortened to form the shortened second convex portion 22ks instead of the second convex portion 22k. Of course, the second convex portion 22k may be shortened to form the shortened second convex portion 22ks, and the first convex portion 21k may also be shortened to form the shortened first convex portion 21ks, thereby making it possible to secure a wide gap G. In the example shown in FIG. 9, the upper end side of the first convex portion 21k and the lower end side of the shortened second convex portion 22ks in the connected flame port region are subjected to so-called R-chamfering, as in the divided flame port region of FIG. 8, but the R-chamfering in the connected flame port region is not essential, and the R-chamfering may be omitted as long as the gap G is secured between the first convex portion 21k and the shortened second convex portion 22ks. Of course, in order to ensure a wide gap G, R chamfering or C chamfering may be performed.

[0057] 10 is an explanatory diagram showing the arrangement of the divided flame port areas and the connected flame port areas in the burner cap 20 of the gas burner 10 of the second embodiment. The figure shows the burner cap 20 as seen from above. First, in the outer peripheral surface of the burner cap 20, at a position facing the claw portion 4b of the trivet 4 as described above, a non-flame port area where neither the first upper flame port 20Ua nor the second upper flame port 20Ub is open is arranged, and in the illustrated example, six non-flame port areas are arranged corresponding to each of the six claw portions 4b.

[0058] In addition, a flame port area is arranged between each of the non-flame port areas, and among the six flame port areas, three are divided flame port areas, and the remaining three are connected flame port areas. In the example shown in Fig. 10, the divided flame port areas and the connected flame port areas are alternately arranged in the circumferential direction of the outer circumferential surface of the burner cap 20.

[0059] As described above, in the gas burner 10 of the second embodiment, not only the divided flame port area but also the connected flame port area is provided on the outer peripheral surface of the burner cap 20. In the divided flame port area, the divided flames formed individually at each of the first upper flame port 20Ua and the second upper flame port 20Ub resonate with each other, which may generate a resonance sound. However, in the connected flame port area, a connected flame connected from the first upper flame port 20Ua to the second upper flame port 20Ub is mainly formed, and the divided flames are less likely to be formed close to each other. Therefore, it is possible to suppress (reduce the volume of) the resonance sound generated by the gas burner 10 as a whole, compared to when only the divided flame port area is provided on the outer peripheral surface of the burner cap 20 and the connected flame port area is not provided.

[0060] Furthermore, although the shapes of the flames formed are different in the divided flame port areas and the connected flame port areas, by arranging the divided flame port areas and the connected flame port areas alternately in the circumferential direction of the outer circumferential surface of the burner cap 20, the flames can be distributed evenly, thereby ensuring stable heating performance for the cooking container placed on the trivet 4.

[0061] The above describes various embodiments and modifications of the gas burner 10. However, the present invention is not limited to the above embodiments and modifications, and can be embodied in various forms without departing from the spirit of the present invention.

[0062] For example, in the burner cap 20 of the first embodiment described above, the upper end of the first convex portion 21k and the lower end of the second convex portion 22k at the divided point of the flame port region were positioned on the same plane (see Figure 6), but as with the divided flame port region in the burner cap 20 of the second embodiment (see Figure 8), a vertical gap H may be secured between the upper end of the first upper stage flame port 20Ua and the lower end of the second upper stage flame port 20Ub by having the upper end side of the first convex portion 21k and the lower end side of the second convex portion 22k overlap in the vertical direction.

[0063] Furthermore, in the divided flame port region in the burner cap 20 of the second embodiment described above, the upper end side of the first convex portion 21k and the lower end side of the second convex portion 22k are arranged to overlap in the vertical direction (see Figure 8), but the upper end of the first convex portion 21k and the lower end of the second convex portion 22k may be arranged to be positioned on the same plane, as in the divided point of the flame port region in the burner cap 20 of the first embodiment (see Figure 6).

[0064] Furthermore, in the connecting flame port region in the burner cap 20 of the second embodiment described above, the length of the second convex portion 22k is shortened to form a shortened second convex portion 22ks, thereby ensuring the gap G (see Figure 9). However, as in a modified example of the first embodiment (see Figure 7), the upper end of the first convex portion 21k and the lower end of the second convex portion 22k may be positioned on the same plane, and a first C chamfered portion 21m may be provided between both side surfaces and the upper end surface of the first convex portion 21k, and a second C chamfered portion 22m may be provided between both side surfaces and the lower end surface of the second convex portion 22k, thereby ensuring the gap G between the first C chamfered portion 21m and the second C chamfered portion 22m.

[0065] In addition, in the above-mentioned embodiments and modified examples, neither the first upper stage flame port 20Ua nor the second upper stage flame port 20Ub is provided in the non-flame port area of ​​the outer surface of the burner cap 20 that faces the claw portion 4b of the trivet 4, but it is also possible to provide an auxiliary flame port having an opening area smaller than the first upper stage flame port 20Ua and the second upper stage flame port 20Ub.

[0066] In the above-mentioned embodiment, the gas burner 10 (so-called parent-child burner) is described as an example in which the mixed gas is supplied to the upper flame nozzle 20U (first upper flame nozzle 20Ua and second upper flame nozzle 20Ub) through the large mixing tube 12, and the mixed gas is supplied to the lower flame nozzle 20L through the small mixing tube 13. However, the application of the present invention is not limited to the parent-child burner, and may be a type that does not have the small mixing tube 13 or the lower flame nozzle 20L (so-called single burner).

[0067] Furthermore, in the above-mentioned embodiment, the gas burner 10 is described as a type that does not have a temperature sensor that detects the temperature of a cooking vessel placed above the gas burner 10. However, the present invention can also be applied to a gas burner 10 that has a temperature sensor. In this case, the insertion hole is made to penetrate inside the fitting cylinder 22d in the second cap member 22 (see FIG. 4), and the upper part of the temperature sensor that is erected inside the central cylinder 14 is made to protrude from the insertion hole, so that the upper end of the temperature sensor that is biased upward by a biasing spring abuts against the lower surface of the cooking vessel to detect the temperature of the cooking vessel. [Explanation of symbols]

[0068] 1...Gas stove, 2...Stove body, 3...Tabletop, 4... Trivet, 4a... Frame, 4b... Claw, 5...operation knob, 10...gas burner, 11...burner body, 11a... placement surface; 12... large mixing tube; 13... small mixing tube; 14...Central cylinder, 15...Partition cylinder, 15a...Mating surface, 16...Mixing chamber, 16a...Inner mixing chamber, 16b...Outer mixing chamber, 17... bottom plate, 17h... through hole, 20... burner cap, 20L...Lower flame nozzle, 20U...Upper flame nozzle, 20Ua...1st upper flame nozzle, 20Ub... second upper flame port, 20Uc... connecting upper flame port, 21... first cap member, 21a... partition tube, 21b... lower annular wall, 21c... lower groove, 21d...first annular wall, 21e...first groove, 21k...first protrusion, 21m...first C chamfered portion, 21n...first R chamfered portion, 21ks...first shortened convex portion, 22... second cap member; 22a... second annular wall; 22b... second groove; 22d... fitting cylinder; 22k... second convex portion; 22m... second C chamfered portion; 22n...second R chamfered portion, 22ks...second shortened protrusion portion, 30...spark plug, 31: eaves portion; 32: flame sensor; 40: gas piping; 40a...branch pipe, 40b...branch pipe, 41...main valve, 42a...flow control valve, 42b...flow control valve.

Claims

1. A gas burner having a plurality of flame ports opening in a circumferential direction on an outer peripheral surface of a flame port forming member which can be separated into upper and lower portions, and ejecting a mixture of fuel gas and air from the flame ports for combustion, The first forming member below the flame port forming member has a first annular wall that is erected in an annular shape from an outer edge portion toward the upper side, and a plurality of first grooves in the radial direction are recessed at a predetermined interval in the circumferential direction on the upper end side of the first annular wall, and the space between adjacent first grooves forms a first convex portion that is convex upward, The second forming member on the upper side of the flame port forming member has a second annular wall extending downward from an outer edge portion thereof in an annular shape, and a plurality of radial second grooves are recessed at a predetermined interval in the circumferential direction on the lower end side of the second annular wall, and a second convex portion is formed between adjacent second grooves, the second convex portion being convex downward. The first groove of the first annular wall and the second groove of the second annular wall are shifted in the circumferential direction so as not to overlap with each other, and the second forming member is placed on the first forming member. In this state, the outer circumferential surface of the flame port forming member is a dividing portion where the first convex portion and the second convex portion come into contact with each other to divide a first flame port defined by the first groove and a lower end of the second convex portion and a second flame port defined by the second groove and an upper end of the first convex portion; The first protrusion and the second protrusion are not in contact with each other and have a gap therebetween, so that the first flame port and the second flame port are connected to each other via the gap at a connection portion. A gas burner comprising:

2. 2. The gas burner according to claim 1, The disconnected portions and the connected portions are alternately arranged in the circumferential direction of the outer circumferential surface of the flame port forming member. A gas burner characterized by:

3. 2. The gas burner according to claim 1, A connecting region in which a plurality of the connecting points are arranged continuously is provided on the outer circumferential surface of the flame port forming member. A gas burner characterized by:

4. A cooking device comprising the gas burner according to any one of claims 1 to 3, and configured to heat a cooking vessel by combustion in the gas burner.

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