Gas burner and heating cooker equipped with gas burner

Abstract

The invention provides a gas burner and a heating cooker. A plurality of first grooves are formed in the upper end side of the first annular wall of the first forming component on the lower side of the flame port forming component in a sunken mode, and the portion between every two adjacent first grooves is set as a first convex portion. On the other hand, a plurality of second grooves are concavely arranged on the lower end side of the second annular wall of the second forming component on the upper side, and the part between the adjacent second grooves is set as a second convex part. In addition, in a state in which the second forming member is placed on the first forming member so as not to overlap the first groove and the second groove and to be staggered in the circumferential direction, a breaking portion is provided in which a first flame port partitioned by the lower ends of the first groove and the second convex portion and a second flame port partitioned by the upper ends of the second groove and the first convex portion are separated by the contact of the first convex portion and the second convex portion, and the breaking portion is provided in a state in which the second forming member is placed on the first forming member so as to be staggered in the circumferential direction so that the first groove and the second groove do not overlap. And a connection portion where the first flame port and the second flame port are connected via a gap between the first protruding portion and the second protruding portion without contact with each other.

Description

Technical Field

[0001] The present invention relates to a gas burner in which first flame ports on the lower side and second flame ports on the upper side are alternately opened in the circumferential direction of the outer peripheral surface of a flame port forming member that can be divided vertically, and a heating cooker equipped with the gas burner. Background Art

[0002] The following gas burner is widely used in heating cookers such as gas stoves: in the gas burner, a plurality of flame ports are opened in the circumferential direction of the outer peripheral surface of the flame port forming member, so that a mixed gas of fuel gas and air is ejected from the flame ports and the mixed gas is burned. In such a gas burner, in order to improve the processability of the flame port forming member, a scheme that the flame port forming member can be divided into upper and lower parts is proposed (for example, Patent Document 1).

[0003] The first forming member on the lower side of the flame port forming member has a first annular wall arranged vertically in an annular shape from the outer edge portion toward the upper side, and a plurality of radial first grooves are recessed at predetermined intervals in the circumferential direction on the upper end side of the first annular wall, and the portion between adjacent first grooves becomes a first convex portion protruding upward. On the other hand, the second forming member on the upper side of the flame port forming member has a second annular wall arranged vertically in an annular shape from the outer edge portion toward the lower side, and a plurality of radial second grooves are recessed at predetermined intervals in the circumferential direction on the lower end side of the second annular wall, and the portion between adjacent second grooves becomes a second convex portion protruding downward. And, in a state where the first groove and the second groove are staggered in the circumferential direction in a non-overlapping manner and the second forming member is placed on the first forming member, the first convex portion contacts the second convex portion, so that the first flame port divided by the lower end of the first groove and the second convex portion opens on the outer circumferential surface of the first annular wall, and the second flame port divided by the upper end of the second groove and the first convex portion opens on the outer circumferential surface of the second annular wall. That is, on the outer peripheral surface of the flame port forming member, the first flame ports and the second flame ports are alternately arranged in a spaced-apart state in the circumferential direction.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2019-143959 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] But, in the gas burner of the past that the 1st flame port of the lower side and the 2nd flame port of the upper side are alternately opened on the circumference of the outer peripheral surface of the flame port forming member as mentioned above, if the flow rate of the mixed gas supplied to the flame port forming member increases, then there is the problem of producing unpleasant sound sometimes along with combustion. This sound is produced as follows. First, if the flow rate of the mixed gas ejected from the flame port increases, then the flame formed on the outside of the flame port is easy to vibrate, and especially, the smaller the flame is, the easier it is to vibrate. And, if relatively small same flame approaches and is connected on the circumference of the outer peripheral surface of the flame port forming member, then sometimes flames resonate with each other, thus producing resonance sound from the flame.

[0009] The present invention is made to address the above-mentioned problems in the prior art, and its purpose is to provide a technology that can suppress the resonance sound generated from the flame as the mixed gas burns in a 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 a flame port forming component that can be divided into upper and lower parts.

[0010] Solutions for solving problems

[0011] In order to solve the above problems, the gas burner of the present invention adopts the following structure. That is,

[0012] A gas burner, wherein a plurality of flame ports are opened in the circumferential direction of the outer peripheral surface of a flame port forming member which can be divided up and down, and a mixed gas of fuel gas and air is ejected from the flame ports to burn the mixed gas, characterized in that:

[0013] The first forming member on the lower side of the flame port forming member has a first annular wall arranged upright in an annular shape from the outer edge portion toward the upper side, and a plurality of radial first grooves are recessed at predetermined intervals in the circumferential direction on the upper end side of the first annular wall, and the portion between adjacent first grooves becomes a first convex portion protruding upward.

[0014] The second forming member on the upper side of the flame port forming member has a second annular wall vertically arranged in an annular shape from the outer edge portion toward the bottom, and a plurality of radial second grooves are recessed at predetermined intervals in the circumferential direction at the lower end side of the second annular wall, and the portion between the adjacent second grooves becomes a second convex portion protruding downward.

[0015] The outer peripheral surface of the flame port forming member is provided with:

[0016] a separation portion in which a first flame opening defined by the first groove and the lower end of the second convex portion is separated from a second flame opening defined by the second groove and the upper end of the first convex portion by the first convex portion contacting the second convex portion; and

[0017] A connection portion in which the first convex portion and the second convex portion are not in contact with each other but a gap exists between the first convex portion and the second convex portion, so that the first flame port and the second flame port are connected via the gap.

[0018] In the gas burner of the present invention, a relatively small flame (disconnected flame) is formed at the disconnected portion at the first flame port and the second flame port, respectively. In contrast, in the connected portion, the first flame port and the second flame port are connected via a gap, thereby forming a flame (connected flame) connected from the first flame port to the second flame port. The connected flame is larger than the disconnected flame, so it is difficult to vibrate even if the flow rate of the mixed gas increases. In addition, the disconnected flames are not only connected in the circumferential direction of the outer peripheral surface of the flame port forming member, but the resonance of the disconnected flames is hindered by including the connected flame, so that the resonance sound generated from the flame as the mixed gas burns can be suppressed.

[0019] In the gas burner of the present invention described above, the disconnecting portions and the connecting portions may be alternately arranged in a circumferential direction of the outer peripheral surface of the flame port forming member.

[0020] In a gas burner of such a structure, by alternately arranging the disconnecting parts and the connecting parts, the resonance between the disconnected flames is easily blocked by the connecting flame being interposed between the disconnected flames, compared with the case where the disconnecting parts and the connecting parts are randomly arranged. Therefore, the resonance sound generated from the flame accompanying the combustion of the mixed gas can be effectively suppressed.

[0021] Furthermore, in the gas burner of the present invention described above, a connection region in which a plurality of connection portions are continuously arranged may be provided on the outer peripheral surface of the flame port forming member.

[0022] In the gas burner of such a structure, the connecting area mainly forms a connecting flame connecting from the first flame port to the second flame port, and the possibility of the separated flames being formed close to each other is low, so the generation of the resonance sound caused by the resonance between the separated flames can be suppressed. Therefore, as long as such a connecting area is provided in advance on a part of the outer peripheral surface of the flame port forming member, the resonance sound generated by the gas burner as a whole can be reduced compared with the case where the connecting area is not provided.

[0023] Such a gas burner of the present invention may be mounted on a heating cooker, and a cooking container may be heated by combustion in the gas burner.

[0024] In such a cooking device, resonance sound generated by flames accompanying combustion of mixed gas in the mounted gas burner can be suppressed, and therefore quietness as the cooking device can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a perspective view showing the appearance of a gas range 1 as an example of a heating cooker equipped with a gas burner 10 according to the present embodiment.

[0026] Figure 2 It is a perspective view showing a schematic shape of the gas burner 10 according to the present embodiment.

[0027] Figure 3 It is a perspective view showing a state in which the upper portion of the gas burner 10 of the present embodiment is exploded.

[0028] Figure 4 It is a longitudinal sectional view showing the internal structure of the gas burner 10 of this embodiment.

[0029] Figure 5 This is an explanatory diagram showing an enlarged view of the outer peripheral surface of the burner cover 20 in the gas burner 10 which may generate an unpleasant sound due to the combustion of the mixed gas.

[0030] Figure 6 This is an explanatory diagram showing an enlarged view of the outer peripheral surface of the burner cover 20 in the gas burner 10 according to the first embodiment.

[0031] Figure 7 This is an explanatory diagram showing an enlarged outer peripheral surface of a burner cover 20 in a gas burner 10 as a modified example of the first embodiment.

[0032] Figure 8 This is an explanatory diagram showing, in enlarged form, a flame-dividing port region on the outer peripheral surface of a burner cover 20 in a gas burner 10 according to a second embodiment.

[0033] Fig. 9 This is an explanatory diagram showing an enlarged view of a connecting flame port region on the outer peripheral surface of a burner cover 20 in a gas burner 10 according to a second embodiment.

[0034] Fig.10 It is an explanatory diagram showing the arrangement of the divided flame port area and the connected flame port area in the burner cover 20 of the gas burner 10 according to the second embodiment.

[0035] Description of Reference Numerals

[0036] 1. Gas stove; 2. Stove body; 3. Top plate; 4. Fire support; 4a. Frame; 4b. Claw; 5. Operating knob; 10. Gas burner; 11. Burner body; 11a. Loading surface; 12. Large mixing tube; 13. Small mixing tube; 14. Central cylinder; 15. Partition cylinder; 15a. Fitting surface; 16. Mixing chamber; 16a. Inner mixing chamber; 16b. Outer mixing chamber; 17. Bottom plate; 17h. Through hole; 20. Burner cover; 20L. Lower flame port; 20U. Upper flame port; 20Ua. First upper flame port; 20Ub. Second upper flame port; 20Uc. Connecting upper flame port; 21. First cover member; 21a. Next-door cylinder; 21b, lower annular wall; 21c, lower groove; 21d, first annular wall; 21e, first groove; 21k, first convex portion; 21m, first C chamfered portion; 21n, first R chamfered portion; 21ks, shortened first convex portion; 22, second cover 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, shortened second convex portion; 30, spark plug; 31, eaves; 32, flame sensor; 40, gas piping; 40a, branch pipe; 40b, branch pipe; 41, main valve; 42a, flow regulating valve; 42b, flow regulating valve. DETAILED DESCRIPTION

[0037] Figure 1 1 is a perspective view showing the appearance of a gas stove 1 as an example of a heating cooker equipped with a gas burner 10 of the present embodiment. The illustrated gas stove 1 includes: a stove body 2 having a shallow box shape with an open upper surface; and a top plate 3 placed on the stove body 2 to cover the upper surface of the stove body 2. Two gas burners 10 are provided on the left and right of the stove body 2, and the upper parts of the gas burners 10 protrude from through holes formed in the top plate 3.

[0038] A fire support 4 is provided on the top plate 3 for placing a cooking vessel such as a pot above the gas burner 10. As shown in the figure, the fire support 4 radially supports a plurality of (six in this embodiment) claws 4b through a circular frame 4a placed on the top plate 3 to surround the gas burner 10. The cooking vessel is placed on the upper surface of these claws 4b, and the cooking vessel is heated by burning a mixed gas of fuel gas and air by the gas burner 10. In addition, on the front side of the top plate 3, corresponding to the two gas burners 10, an operating knob 5 for the user to operate when igniting, extinguishing, or adjusting the heat is provided. If the operating knob 5 is pressed down and rotated in a predetermined direction (counterclockwise in this embodiment) from the initial position, fuel gas is supplied to the gas burner 10, and ignition is performed by the spark plug discussed later. Thereafter, by changing the rotation angle of the operating knob 5, the supply amount of fuel gas can be changed to adjust the firepower of the gas burner 10. By returning the operating knob 5 to the initial position, the supply of fuel gas to the gas burner 10 is stopped until the flame is extinguished.

[0039] Figure 2 1 is a three-dimensional diagram showing the approximate shape of the gas burner 10 of this embodiment. As shown in the figure, the gas burner 10 is a structure in which a roughly cylindrical burner cover 20 is placed on a roughly cylindrical burner body 11. Two large and small mixing tubes (a large mixing tube 12 and a small mixing tube 13) are connected to the burner body 11. 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 discussed later, a mixed gas of fuel gas and air is supplied to the burner body 11 through the mixing tubes 12 and 13.

[0040] On the other hand, the burner cover 20 of this embodiment is formed by die casting using aluminum alloy, brass, etc. On the outer peripheral surface of the burner cover 20 placed on the burner body 11, as shown in Figure 2 In the figure, it is shown in an enlarged manner that a plurality of flame ports 20U and 20L are opened in an arrangement of two layers, one above the other. The details will be discussed later, wherein the plurality of upper layer flame ports 20U on the upper layer side are composed of two types, the first upper layer flame port 20Ua on the lower side and the second upper layer flame port 20Ub on the upper side are alternately arranged in the circumferential direction of the outer peripheral surface of the burner cover 20. In addition, the burner cover 20 of this embodiment is equivalent to the "flame port forming member" of the present invention.

[0041] A main valve 41 for opening and closing the gas pipe 40 is provided on the gas pipe 40 for guiding the fuel gas to the gas burner 10, and the gas pipe 40 is branched into two at a position downstream of the main valve 41, and flow regulating valves 42a and 42b for regulating the flow of the fuel gas are provided on the branch pipes 40a and 40b, respectively. The main valve 41 is electrically connected to a control unit not shown in the figure, and the opening and closing is controlled by the control unit. On the other hand, the flow regulating valves 42a and 42b are connected to the operating knob 5 on the top plate 3 by means of a shaft (not shown in the figure), and the flow of the fuel gas can be changed according to the rotation of the operating knob 5.

[0042] When the fuel gas is ejected from a nozzle (not shown) connected to the end of the branch pipe 40a toward the open end 12o of the large mixing pipe 12, the surrounding air is sucked in due to the ejector effect and the surrounding air is caused to flow into the large mixing pipe 12, and the mixed gas of the fuel gas and the air mixed through the large mixing pipe 12 is supplied to the burner body 11. Similarly, when the fuel gas is ejected from a nozzle (not shown) connected to the end of the branch pipe 40b toward the open end 13o of the small mixing pipe 13, the surrounding air is sucked in and the surrounding air is caused to flow into the small mixing pipe 13, and the mixed gas of the fuel gas and the air mixed through the small mixing pipe 13 is supplied to the burner body 11.

[0043] The gas burner 10 of this embodiment is a so-called parent-child burner, and the details will be discussed later. A mixed gas is supplied from a large mixing tube 12 to a plurality of upper flame ports 20U (a first upper flame port 20Ua and a second upper flame port 20Ub), and in contrast, a mixed gas is supplied from a small mixing tube 13 to a plurality of lower flame ports 20L on the lower side. In addition, as shown in the figure, a spark plug 30 is provided in a manner close to the outer peripheral surface of the burner body 11, and a flange portion 31 extending from the outer peripheral surface of the burner cover 20 covers the top of the spark plug 30. By performing a spark discharge from the spark plug 30 toward the burner cover 20, the combustion of the mixed gas ejected from the lower flame port 20L begins. In addition, a flame sensor 32 composed of a thermocouple is provided at a position adjacent to the spark plug 30, which can detect the flame of the lower flame port 20L. The flame sensor 32 is electrically connected to the aforementioned control unit.

[0044] In the gas burner 10 of the present embodiment, the aforementioned flow regulating 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. In addition, the opening area of ​​the lower flame port 20L is smaller than the opening area of ​​the upper flame port 20U, and the ejection amount (supply flow rate) of the mixed gas becomes less. Therefore, if the required firepower in the gas burner 10 is small, the mixed gas is burned only at the lower flame port 20L, and if the required firepower becomes larger, the mixed gas can be burned at both the lower flame port 20L and the upper flame port 20U. At this time, due to the spread of the flame from the lower flame port 20L, the combustion of the mixed gas ejected from the upper flame port 20U begins. Moreover, as shown in the figure, the upper flame opening 20U is not opened at the position of the outer peripheral surface of the burner cover 20 opposite to the plurality of claws 4b of the aforementioned fire support 4, so as to prevent the claws 4b from being burned by the flame of the upper flame opening 20U.

[0045] Figure 3 1 is a perspective view showing a state where the upper part of the gas burner 10 of this embodiment is exploded. As shown in the figure, the burner body 11 of a substantially cylindrical shape is bent inwardly at the upper end side, and has an annular mounting surface 11a for mounting the burner cover 20. The upper part of the burner body 11 protrudes from the through hole of the top plate 3 when the gas burner 10 is set on the stove body 2. In addition, a substantially cylindrical central cylinder 14 is erected inside the burner body 11, and an annular mixing chamber 16 for supplying mixed gas is formed between the burner body 11 and the central cylinder 14.

[0046] Moreover, a roughly cylindrical partition cylinder 15 is provided between the burner body 11 and the central cylinder 14. Thus, the mixing chamber 16 is divided into an inner mixing chamber 16a which is an inner portion (i.e., between the partition cylinder 15 and the central cylinder 14) closer to the inner side than the partition cylinder 15 and an outer mixing chamber 16b which is an outer portion (i.e., between the burner body 11 and the partition cylinder 15) closer to the outer side than the partition cylinder 15. The mixed gas passing through the aforementioned large mixing tube 12 is supplied to the inner mixing chamber 16a, and the mixed gas passing through the aforementioned small mixing tube 13 is supplied to the outer mixing chamber 16b. The partition cylinder 15 is formed by sheet metal processing in the same manner as the burner body 11, with the upper end side bent inwardly, and the inner side bent downwardly, and has a relatively short cylindrical fitting surface 15a.

[0047] The burner cover 20 of this embodiment is structured so as to be divisible into two parts, one above the other, in order to improve workability. The first cover member 21 on the lower side is placed on the burner body 11, and the second cover member 22 on the upper side is placed on the first cover member 21. As shown in the figure, a cylindrical partition tube 21a is vertically provided downward from the inner edge portion of the annular first cover member 21. In addition, a shallow annular lower layer annular wall 21b is vertically provided downward from the outer edge portion of the first cover member 21, and a plurality of radial lower layer grooves 21c are recessed and provided in a manner arranged in the circumferential direction at the lower end side of the lower layer annular wall 21b. When the first cover 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 layer annular wall 21b of the first cover member 21 is brought into contact with the mounting surface 11a of the burner body 11. In addition, the first cover member 21 of the present embodiment corresponds to the “first forming member” of the present invention, and the second cover member 22 of the present embodiment corresponds to the “second forming member” of the present invention.

[0048] In addition, the first cover member 21 has a first annular wall 21d that is annularly erected from the outer edge portion toward the upper side, and a plurality of radial first grooves 21e are recessed at predetermined intervals in the circumferential direction on the upper end side of the first annular wall 21d. In addition, the first grooves 21e are not provided at positions in the first annular wall 21d that are opposite to the plurality of claws 4b of the fire support 4.

[0049] On the other hand, the circular second cover member 22 has a second annular wall 22a vertically arranged in an annular shape from the outer edge portion toward the bottom, and a plurality of radial second grooves 22b are recessed and arranged at predetermined intervals in the circumferential direction on the lower end side of the second annular wall 22a. In addition, the aforementioned flange portion 31 covering the upper part of the spark plug 30 is arranged to extend from the outer peripheral surface of the second annular wall 22a. In addition, similar to the above-mentioned first groove 21e, the second groove 22b is not arranged at a position in the second annular wall 22a that is opposite to the plurality of claws 4b of the spark support 4. In addition, in the burner cover 20 of the present embodiment, when the second cover member 22 is placed on the first cover member 21, the upper end of the first annular wall 21d is aligned with the lower end of the second annular wall 22a in a state where the first groove 21e and the second groove 22b are offset in the circumferential direction so as not to overlap.

[0050] Figure 4It is a longitudinal sectional view showing the internal structure of the gas burner 10 of the present embodiment. As mentioned above, an annular mixing chamber 16 is provided on the inner side of the burner body 11 and between the central cylinder 14, and is divided into an inner mixing chamber 16a and an outer mixing chamber 16b by a partition cylinder 15. When the first cover member 21 is placed on the burner body 11, the partition cylinder 21a is fitted into the inner side of the fitting surface 15a of the partition cylinder 15, and the lower end of the lower annular wall 21b of the first cover 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 peripheral surface of the lower annular wall 21b. Figure 4 In the sectional view, the lower annular wall 21b on the right side of the first cover member 21 represents a section cut at a position where there is no lower groove 21c, and the lower annular wall 21b on the left side represents a section cut at the position of the lower groove 21c (lower flame port 20L).

[0051] The lower flame port 20L is connected to the outer mixing chamber 16b, and the mixed gas supplied through the aforementioned small mixing tube 13 is ejected from the lower flame port 20L, and the combustion of the mixed gas is started by the spark discharge of the spark plug 30. The flame sensor 32 of this embodiment is configured to detect the flame of the lower flame port 20L.

[0052] like Figure 4 As shown, a cylindrical fitting tube 22d is vertically provided from the lower surface of the second cover member 22, and when the second cover member 22 is placed on the first cover member 21, the fitting tube 22d is fitted inside the upper portion of the central cylinder 14. In addition, the lower end side of the central cylinder 14 is airtightly joined to the periphery of the through hole 17h formed in the bottom plate 17 made of sheet metal.

[0053] In addition, the second cover member 22 is placed relative to the first cover member 21 in such a manner that the first groove 21e of the first annular wall 21d and the second groove 22b of the second annular wall 22a are offset in the circumferential direction without overlapping. As a result, the first upper flame port 20Ua divided by the first groove 21e and the lower end of the second annular wall 22a opens on the outer peripheral surface of the first annular wall 21d, and the second upper flame port 20Ub divided by the second groove 22b and the upper end of the first annular wall 21d opens on the outer peripheral surface of the second annular wall 22a. Figure 4 In the cross-sectional view, the first annular wall 21d and the second annular wall 22a on the right side represent the cross section cut at the position of the first groove 21e (the first upper flame port 20Ua), and the first annular wall 21d and the second annular wall 22a on the left side represent the cross section cut at the position of the second groove 22b (the second upper flame port 20Ub). In addition, the first upper flame port 20Ua of this embodiment is equivalent to the "first flame port" of the present invention, and the second upper flame port 20Ub of this embodiment is equivalent to the "second flame port" of the present invention.

[0054] The first upper flame port 20Ua and the second upper flame port 20Ub are connected to the inner mixing chamber 16a, and the mixed gas supplied through the aforementioned large mixing tube 12 is ejected from the first upper flame port 20Ua and the second upper flame port 20Ub, and the combustion of the mixed gas begins due to the extension of the flame from the lower flame port 20L.

[0055] In the gas burner 10 in which the first upper flame port 20Ua and the second upper flame port 20Ub are opened as the upper flame ports 20U on the outer peripheral surface of the burner cover 20, unpleasant sounds are sometimes produced as the mixed gas ejected from the first upper flame port 20Ua and the second upper flame port 20Ub burns. Hereinafter, the structure adopted in the gas burner 10 of this embodiment in order to suppress such sounds is described, and as a preparation for this, the reason why unpleasant sounds are produced as the mixed gas burns is first described.

[0056] Figure 5 This is an explanatory diagram showing an enlarged view of the outer peripheral surface of the burner cover 20 in the gas burner 10 which may generate an unpleasant sound as the mixed gas burns. In the figure, the outer peripheral surfaces of the first annular wall 21d of the first cover member 21 and the second annular wall 22a of the second cover member 22 are marked with hatching lines. As shown in the figure, the portion between the adjacent first grooves 21e of the first annular wall 21d becomes the first convex portion 21k protruding upward, and the portion between the adjacent second grooves 22b of the second annular wall 22a becomes the second convex portion 22k protruding downward. In addition, the width of the first protrusion 21k in the circumferential direction (left-right direction in the figure) of the burner cover 20 is wider than the width of the second groove 22b in the circumferential direction (left-right direction in the figure), and the width of the second protrusion 22k is wider than the width of the first groove 21e. Therefore, when the first groove 21e and the second groove 22b are offset in the circumferential direction in a non-overlapping manner, there is a circumferential overlap amount between the first protrusion 21k and the second protrusion 22k.

[0057] Furthermore, since the first protrusion 21k is in contact with the second protrusion 22k, the first upper flame port 20Ua is divided by the first groove 21e and the lower end of the second protrusion 22k, and the second upper flame port 20Ub is divided by the second groove 22b and the upper end of the first protrusion 21k. Therefore, on the outer peripheral surface of the burner cover 20, the first upper flame port 20Ua and the second upper flame port 20Ub are opened alternately in the circumferential direction in a divided state. In addition, in the outer peripheral surface of the burner cover 20, at a position opposite to the plurality of claws 4b of the aforementioned fire support 4, neither the first upper flame port 20Ua nor the second upper flame port 20Ub is opened. Hereinafter, the area where either the first upper flame port 20Ua or the second upper flame port 20Ub is not opened within a range greater than a predetermined interval is referred to as a "non-flame port area", and the area where the first upper flame port 20Ua and the second upper flame port 20Ub are opened alternately in the circumferential direction is referred to as a "flame port area".

[0058] As described above, the upper flame ports 20U (the first upper flame port 20Ua and the second upper flame port 20Ub) are supplied with mixed gas through the large mixing tube 12, and therefore, the flow rate of the supplied mixed gas is increased compared to the lower flame ports 20L supplied with mixed gas through the small mixing tube 13. Generally speaking, if the flow rate of the mixed gas ejected from the flame ports increases, the flame formed outside the flame ports is prone to vibration, and in particular, the smaller the flame, the more likely it is to vibrate. And, if Figure 5 As shown, the first upper flame port 20Ua and the second upper flame port 20Ub are alternately opened in the circumferential direction in the flame port area of ​​the outer peripheral surface of the burner cover 20, and the relatively small flames formed independently at each flame port 20Ua and 20Ub are close to each other and connected, so the flames resonate with each other, thereby generating resonance sound from the flames. Therefore, in the gas burner 10 of this embodiment, in order to suppress the resonance sound generated from the flames as the mixed gas is burned, the following structure is adopted.

[0059] Figure 6This is an explanatory diagram showing an enlarged outer peripheral surface of the burner cover 20 in the gas burner 10 of the first embodiment. In the figure, hatching is marked on the outer peripheral surfaces of the first annular wall 21d and the second annular wall 22a. As shown in the figure, the second annular wall 22a of the second cover member 22 of the first embodiment is provided with a shortened second protrusion 22ks formed by shortening the length of a part of the second protrusions 22k among the plurality of second protrusions 22k. The shortened second protrusion 22ks does not contact the first protrusion 21k, and there is a gap G between the shortened second protrusion 22ks and the first protrusion 21k. As a result, a connected upper flame port 20Uc formed by connecting two second upper flame ports 20Ub on both sides of the shortened second protrusion 22ks and one first upper flame port 20Ua opposite to the shortened second protrusion 22ks via the gap G is formed.

[0060] Similarly, a shortened first protrusion 21ks formed by shortening the length of a part of the first protrusions 21k among the plurality of first protrusions 21k is provided on the first annular wall 21d of the first cover member 21. The shortened first protrusion 21ks does not contact the second protrusion 22k, and there is a gap G between the shortened first protrusion 21ks and the second protrusion 22k. Thus, a connected upper flame port 20Uc formed by connecting two first upper flame ports 20Ua on both sides of the shortened first protrusion 21ks and one second upper flame port 20Ub opposite to the shortened first protrusion 21ks via the gap G is formed.

[0061] In this way, the flame (connected flame) formed at the connected upper flame port 20Uc formed by connecting the first upper flame port 20Ua and the second upper flame port 20Ub via the gap G is larger than the flames (interrupted flames) formed separately at the first upper flame port 20Ua and the second upper flame port 20Ub, so it is difficult to vibrate even if the flow rate of the mixed gas increases. In addition, in the flame port area on the outer peripheral surface of the burner cover 20, not only the interrupted flames are connected in the circumferential direction, but the resonance of the interrupted flames is prevented by including the connected flame, so that the resonance sound generated from the flame along with the combustion of the mixed gas can be suppressed.

[0062] In particular, Figure 6As shown, in the flame port region of the burner cover 20 of the first embodiment, the separation portion where the first upper flame port 20Ua and the second upper flame port 20Ub are separated by the contact between the first protrusion 21k and the second protrusion 22k, and the connection portion (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 by shortening the first protrusion 21ks or shortening the second protrusion 22ks are alternately arranged in the circumferential direction. In this way, compared with the case where the separation portion and the connection portion are randomly arranged, the resonance between the separated flames is easily blocked by the connection flame interposed between the separated flames, and therefore, the resonance sound generated from the flames accompanying the combustion of the mixed gas can be effectively suppressed.

[0063] In addition, the spacing of the gap G only needs to be larger than the spacing (for example, 0.3 mm) that forms a flame on the outside by ejecting the mixed gas from the gap G, that is, the spacing of the connected flame from the first upper flame port 20Ua to the second upper flame port 20Ub, and it is desired that it is narrower than the circumferential width of the first groove 21e and the second groove 22b (for example, 1.0 mm).

[0064] In addition, Figure 6 In the example of the present invention, the shortened first protrusion 21ks or the shortened second protrusion 22ks is provided to ensure the gap G, but the present invention is not limited thereto, and the gas burner 10 of the first embodiment also has the following modified examples. Figure 7 This is an explanatory diagram showing an enlarged view of the outer peripheral surface of the burner cover 20 in the gas burner 10 as a modified example 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.

[0065] As shown in the figure, a first protrusion 21k of a part of the first annular wall 21d of the first cover member 21 of the modified example is subjected to a so-called C-chamfering process between one side surface (in the example shown, the right side surface) and the upper end surface to provide a first C-chamfered portion 21m. On the other hand, a second protrusion 22k of a part of the second annular wall 22a of the second cover member 22 is subjected to a C-chamfering process between one side surface (in the example shown, the left side surface) and the lower end surface to provide a second C-chamfered portion 22m.

[0066] Such 1C chamfered portion 21m and 2C chamfered portion 22m are arranged in a relative manner without contacting each other, and there is a gap G between the two. Thus, a connected upper flame port 20Uc formed by connecting the first upper flame port 20Ua adjacent to the 1C chamfered portion 21m and the second upper flame port 20Ub adjacent to the 2C chamfered portion 22m via the gap G is formed.

[0067] And, in Figure 7In the example shown, the 1C chamfered portion 21m is provided every other one of the plurality of first protrusions 21k of the first annular wall 21d, and the 2C chamfered portion 22m is provided every other one of the plurality of second protrusions 22k of the second annular wall 22a. Thus, in the flame port area of ​​the outer peripheral surface of the burner cover 20, the separation portion where the first upper flame port 20Ua and the second upper flame port 20Ub are separated and the connection portion (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 are alternately arranged in the circumferential direction.

[0068] In such a modified example of the gas burner 10, as in the aforementioned first embodiment, the resonance between the separate flames formed separately at the first upper flame port 20Ua and the second upper flame port 20Ub is blocked by the connecting flame formed at the connecting upper flame port 20Uc being interposed between the separate flames, thereby being able to suppress the resonance sound generated from the flame as the mixed gas burns.

[0069] In the gas burner 10 of the first embodiment and the modified example described above, in one flame port area, a disconnected portion where the first upper flame port 20Ua and the second upper flame port 20Ub are separated and a connecting portion (connecting upper flame port 20Uc) where the first upper flame port 20Ua and the second upper flame port 20Ub are connected via a gap G exist in a mixed manner. In contrast, in the gas burner 10 of the second embodiment described below, a flame port area where the disconnected portion is continuous and the connecting portion does not exist (hereinafter, the disconnected flame port area) and a flame port area where the connecting portion is continuous and the disconnected portion does not exist (hereinafter, the connecting flame port area).

[0070] first, Figure 8 This is an explanatory diagram showing an enlarged view of a split flame port region on the outer peripheral surface of a burner cover 20 in a gas burner 10 according to the second embodiment. Figure 8 (a) shows a state where the second cover member 22 is placed on the first cover member 21. Figure 8 (b) shows a state where the second cover member 22 is separated from the first cover member 21. In the figure, the outer peripheral surfaces of the first annular wall 21d and the second annular wall 22a are indicated by hatching.

[0071] In the gas burner 10 of the second embodiment, as Figure 8 As shown in (b), the upper end of the first protrusion 21k in the flame cut-off region of the first cover member 21 is located above the upper end of the first annular wall 21d in the non-flame cut-off region. In addition, the lower end of the second protrusion 22k in the flame cut-off region of the second cover member 22 is located below the lower end of the second annular wall 22a in the non-flame cut-off region.

[0072] In addition, the width of the first convex portion 21k in the circumferential direction (left-right direction in the figure) of the burner cover 20 is wider than the width of the second groove 22b in the circumferential direction (left-right direction in the figure) of the burner cover 20, and the first convex portion 21k is provided with a first R chamfered portion 21n by performing a so-called R chamfering process between both side surfaces and the upper end surface. Similarly, the width of the second convex portion 22k is wider than the width of the first groove 21e, and the second convex portion 22k is provided with a second R chamfered portion 22n by performing a R chamfering process between both side surfaces and the lower end surface.

[0073] Furthermore, if the second cover member 22 is placed on the first cover member 21, Figure 8 As shown in (a), in the non-flame mouth area, the upper end of the first annular wall 21d contacts the lower end of the second annular wall 22a, and in the segmented flame mouth area, the first R chamfered portion 21n of the first convex portion 21k contacts the second R chamfered portion 22n of the second convex portion 22k. 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 located above the lower end of the second convex portion 22k.

[0074] In the gas burner 10 of the second embodiment, the flame-cutting area of ​​the outer peripheral surface of the burner cover 20 overlaps in the upper end side of the first protrusion 21k and the lower end side of the second protrusion 22k in the vertical direction, so that the interval H in the vertical direction can be ensured between the upper end of the first upper flame opening 20Ua and the lower end of the second upper flame opening 20Ub. As a result, the upper end of the first protrusion 21k and the lower end of the second protrusion 22k are located on the same plane (see Figure 5 ), the interference between the flame of the first upper flame port 20Ua and the flame of the second upper flame port 20Ub is suppressed to stabilize the combustion, and the heating efficiency of the flame of the second upper flame port 20Ub close to the cooking container placed above the gas burner 10 can be improved. However, in the split flame port area, the relatively small and similar flames (split flames) formed separately at the first upper flame port 20Ua and the second upper flame port 20Ub are close to each other and connected, so the split flames resonate with each other as described above, thereby easily generating resonance sound.

[0075] on the other hand, Fig. 9This is an explanatory diagram showing the flame connection port region of the outer peripheral surface of the burner cover 20 in the gas burner 10 of the second embodiment by enlarging it. In the figure, the outer peripheral surfaces of the first annular wall 21d and the second annular wall 22a are marked with hatching lines to show it. As shown in the figure, the upper end of the first protrusion 21k in the flame connection port region of the first cover member 21 is located above the upper end of the first annular wall 21d in the non-flame port region, similarly to the above-mentioned split flame port region, but the lower end of the second protrusion 22k in the flame connection port region of the second cover member 22 is located above the lower end of the second annular wall 22a in the non-flame port region. That is, the second protrusion 22k in the flame connection port region becomes a shortened second protrusion 22ks with a shortened length. Therefore, even if the second cover member 22 is placed on the first cover member 21, the shortened second protrusion 22ks will not contact the first protrusion 21k, and there is a gap G between the shortened second protrusion 22ks and the first protrusion 21k. Therefore, in the connecting flame port area, the first upper flame port 20Ua and the second upper flame port 20Ub are connected via the gap G, and the connecting portion (connecting upper flame port 20Uc) is continuous. In addition, the connecting flame port area of ​​the second embodiment is equivalent to the "connecting area" of the present application.

[0076] In such a connected flame port area, there is a tendency to form a connected flame connected from the first upper flame port 20Ua to the second upper flame port 20Ub, and the possibility of forming a separate flame at the first upper flame port 20Ua or the second upper flame port 20Ub and a plurality of separate flames approaching each other is low, thereby suppressing the generation of resonant sound caused by the resonance of the separate flames.

[0077] In addition, Fig. 9 In the example shown, in order to provide the gap G in the connecting flame port region, the length of the second protrusion 22k is shortened to shorten the second protrusion 22ks, but the length of the first protrusion 21k may be shortened to shorten the first protrusion 21ks instead of the second protrusion 22k. Of course, the length of the second protrusion 22k may be shortened to shorten the second protrusion 22ks, and the length of the first protrusion 21k may also be shortened to shorten the first protrusion 21ks, thereby ensuring that the gap G is wider. In addition, Fig. 9 In the example shown, Figure 8 Similarly, the upper end side of the first protrusion 21k and the lower end side of the shortened second protrusion 22ks in the connecting flame mouth area are subjected to the so-called R chamfering process, but the R chamfering process in the connecting flame mouth area is not necessary, and the R chamfering process can be omitted as long as the gap G can be ensured between the first protrusion 21k and the shortened second protrusion 22ks. Of course, in order to ensure a wider gap G, the R chamfering process or the C chamfering process can be deliberately performed.

[0078] Fig.10 This is an explanatory diagram showing the arrangement of the separation flame port area and the connection flame port area in the burner cover 20 of the gas burner 10 of the second embodiment. In the figure, the state of the burner cover 20 viewed from above is shown. First, in the outer peripheral surface of the burner cover 20, as described above, a non-flame port area is arranged at a position opposite to the claw 4b of the fire support 4, where neither the first upper flame port 20Ua nor the second upper flame port 20Ub is open. In the example shown in the figure, six non-flame port areas are arranged corresponding to the six claws 4b, respectively.

[0079] In addition, flame vent areas are arranged between non-flame vent areas, and three of the six flame vent areas are arranged as disconnected flame vent areas, and the remaining three areas are arranged as connected flame vent areas. Fig.10 In the example shown, the split flame port regions and the link flame port regions are alternately arranged in the circumferential direction of the outer peripheral surface of the combustor cover 20 .

[0080] As described above, in the gas burner 10 of the second embodiment, not only the separating flame port area but also the connecting flame port area is provided on the outer peripheral surface of the burner cover 20. Although in the separating flame port area, the separating flames formed separately at the first upper flame port 20Ua and the second upper flame port 20Ub resonate with each other, thereby possibly generating resonance sound, in the connecting flame port area, the connecting flame connected from the first upper flame port 20Ua to the second upper flame port 20Ub is mainly formed, and the possibility of the separating flames being formed close to each other is low. Therefore, compared with the separating flame port area, it is difficult to generate resonance sound caused by the resonance of the separating flames. Therefore, compared with the case where only the separating flame port area is provided on the outer peripheral surface of the burner cover 20 without the connecting flame port area, the resonance sound generated as the gas burner 10 as a whole can be suppressed (the volume is reduced).

[0081] In addition, although the shapes of the flames formed in the separated flame port area and the connected flame port area are different, they can be evenly distributed by alternately arranging the separated flame port area and the connected flame port area in the circumferential direction of the outer peripheral surface of the burner cover 20, thereby ensuring stable heating performance for the cooking container placed on the fire support 4.

[0082] As mentioned above, although the gas burner 10 of various embodiments and modifications was demonstrated, this invention is not limited to the said embodiment and modifications, It can implement in various forms within the range which does not deviate from the summary.

[0083] For example, in the burner cover 20 of the first embodiment described above, the upper end of the first protrusion 21k and the lower end of the second protrusion 22k in the divided portion of the flame port region are located on the same plane (see Figure 6 ), or it may be that the flame port region of the burner cover 20 of the second embodiment is separated (see Figure 8 ) Similarly, the overlap in the vertical direction occurs at the upper end side of the first protrusion 21k and the lower end side of the second protrusion 22k, and a vertical interval H is ensured between the upper end of the first upper flame port 20Ua and the lower end of the second upper flame port 20Ub.

[0084] In addition, in the split flame port region of the burner cover 20 of the second embodiment described above, the vertical overlap occurs between the upper end side of the first protrusion 21k and the lower end side of the second protrusion 22k (see Figure 8 ), or it may be a separation portion from the flame port region in the burner cover 20 of the first embodiment (refer to Figure 6 ) Similarly, the upper end of the first protrusion 21k and the lower end of the second protrusion 22k are located on the same plane.

[0085] In addition, in the connecting flame port region of the burner cover 20 of the second embodiment described above, the second protrusion 22k is shortened to shorten the second protrusion 22ks, thereby ensuring the gap G (see Fig. 9 ), or it may be a modified example of the first embodiment (see Figure 7 ) In this way, the upper end of the first protrusion 21k and the lower end of the second protrusion 22k are located on the same plane, the first C chamfered portion 21m is provided between the two side surfaces and the upper end surface of the first protrusion 21k, and the second C chamfered portion 22m is provided between the two side surfaces and the lower end surface of the second protrusion 22k, thereby ensuring a gap G between the first C chamfered portion 21m and the second C chamfered portion 22m.

[0086] In addition, in the aforementioned embodiments and variations, neither the first upper flame port 20Ua nor the second upper flame port 20Ub is provided in the non-flame port area on the outer peripheral surface of the burner cover 20 opposite to the claw 4b of the fire support 4, and an auxiliary flame port having an opening area smaller than the opening areas of the first upper flame port 20Ua and the second upper flame port 20Ub may be provided.

[0087] In addition, in the aforementioned embodiment, a gas burner 10 (so-called parent-child burner) of a type in which a mixed gas is supplied to the upper flame port 20U (the first upper flame port 20Ua and the second upper flame port 20Ub) through the large mixing tube 12 and a mixed gas is supplied to the lower flame port 20L through the small mixing tube 13 is described as an example. However, the application of the present invention is not limited to the parent-child burner, and may also be a type that does not have a small mixing tube 13 and a lower flame port 20L (so-called single burner).

[0088] Furthermore, in the above-mentioned embodiment, the gas burner 10 of the type without a temperature sensor for detecting the temperature of the cooking container placed above the gas burner 10 is described as an example. However, the present invention can also be applied to the gas burner 10 of the type with a temperature sensor. In this case, the through hole is previously made to penetrate the second cover member 22 at a position further inside than the fitting tube 22d (see Figure 4 ), and the upper part of the temperature sensor vertically arranged on the inner side of the central cylinder 14 is protruded from the through hole, and the temperature of the cooking container can be detected by abutting the upper end of the temperature sensor biased upward by the biasing spring against the lower surface of the cooking container.

Claims

1. A gas burner, wherein a plurality of flame ports are opened in the circumferential direction of the outer peripheral surface of a flame port forming member which can be divided up and down, and a mixed gas of fuel gas and air is ejected from the flame ports to burn the mixed gas, characterized in that: The first forming member on the lower side of the flame port forming member has a first annular wall arranged upright in an annular shape from the outer edge portion toward the upper side, and a plurality of radial first grooves are recessed at predetermined intervals in the circumferential direction on the upper end side of the first annular wall, and the portion between adjacent first grooves becomes a first convex portion protruding upward. The second forming member on the upper side of the flame port forming member has a second annular wall vertically arranged in an annular shape from the outer edge portion toward the bottom, and a plurality of radial second grooves are recessed at predetermined intervals in the circumferential direction at the lower end side of the second annular wall, and the portion between the adjacent second grooves becomes a second convex portion protruding downward. The outer peripheral surface of the flame port forming member is provided with: a separation portion in which a first flame opening defined by the first groove and the lower end of the second convex portion is separated from a second flame opening defined by the second groove and the upper end of the first convex portion by the first convex portion contacting the second convex portion; and A connection portion in which the first convex portion and the second convex portion are not in contact with each other but a gap exists between the first convex portion and the second convex portion, so that the first flame port and the second flame port are connected via the gap.

2. The gas burner according to claim 1, characterized in that: The disconnecting portions and the connecting portions are alternately arranged in a circumferential direction of the outer peripheral surface of the flame port forming member.

3. The gas burner according to claim 1, characterized in that: A connection region in which a plurality of connection portions are continuously arranged is provided on the outer peripheral surface of the flame port forming member.

4. A heating cooker, wherein: The cooking container is equipped with the gas burner according to any one of claims 1 to 3, and is heated by combustion in the gas burner.

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