Gas stove

Abstract

To enhance ignitability nearby a flame light groove radially outside a projection part of a gas cooking stove which has a projection part of a burner cap put in a hollow part of a burner body to be located.SOLUTION: A gas cooking stove 1 has a burner cap 20 comprising a flange part 32 protruding from a cylinder part 31. An outer peripheral part 33 of the flange part 32 is provided with respective exits 131A, 132A and 133A of a first carry-over flame hole groove 131, a second carry-over flame hole groove 132 and an inside carry-over flame hole groove 133. A first inner wall 141A on the side of the first carry-over flame hole groove 131 tilts to a second wall 142 as closer to the outer peripheral part 33. A second inner wall 142B on the side of the second carry-over flame hole groove 132 tilts toward a first wall 141 as closer to the outer peripheral part 33.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to a gas stove. [Background technology]

[0002] The gas burner disclosed in Patent Document 1 has six flame-transfer parts 71-76 provided at 60° intervals in the circumferential direction with the center of the cylindrical wall 15 as the reference. The flame-transfer parts 71-76 are predetermined positions corresponding to six trivet claws provided on a trivet when the gas burner 1 is installed on a stove. Furthermore, the gas burner in Patent Document 1 has a positioning protrusion 16 provided vertically on the flame-transfer part 74. The protrusion 16 fits from above into a positioning hole (not shown) provided on the seat surface 2A of the burner body 2. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-20706 A Summary of the Invention [Problem to be solved by the invention]

[0004] The gas burner of Patent Document 1 has a problem in that the flow of fuel gas is easily obstructed by the positioning protrusions 16 near the flame-transfer portion 74 where the protrusions 16 are provided. If the flow of fuel gas is obstructed by the protrusions 16, ignition becomes difficult at the flame holes provided radially outside the protrusions 16.

[0005] One object of the present disclosure is to improve the ignition ability near the flame groove radially outward of the protrusion of a burner cap in a gas stove in which the protrusion is positioned by fitting it into a recess in the burner body. [Means for solving the problem]

[0006] The gas stove disclosed herein is A burner body for supplying gas; A burner cap including a cylindrical portion and a flange portion extending from the cylindrical portion and attached to the burner body; A gas stove having The burner body includes an upper surface portion having an annular opposing surface opposing the flange portion, and a recessed portion having a configuration recessed with respect to the upper surface portion, The burner cap includes a plurality of flame hole grooves provided on a lower surface portion of the flange portion, and a protrusion provided on the lower surface portion and inserted into the recessed portion, The plurality of flame hole grooves include a plurality of main flame hole grooves which constitute a main flame hole together with the facing surface, and a plurality of flame transfer flame hole grooves which constitute a flame transfer flame hole together with the facing surface, Some of the plurality of fire-transfer flame hole grooves are provided with a first wall disposed on one side of the protruding portion in the circumferential direction of the flange portion, a second wall disposed on the other side of the protruding portion in the circumferential direction, and a plurality of partition walls disposed between the first wall and the second wall in the circumferential direction, A first flame-transfer flame hole groove among the plurality of flame-transfer flame hole grooves includes one partition wall among the plurality of partition walls and the first wall, A second fire-transfer flame hole groove among the plurality of fire-transfer flame hole grooves includes another partition wall among the plurality of partition walls and the second wall, Among the plurality of fire-transfer flame hole grooves, the inner fire-transfer flame hole groove has the plurality of partition walls, A first gas flow passage including a first inner wall on the protruding portion side of the first wall is a gas flow passage leading to the first flame transfer flame hole groove and the inner flame transfer flame hole groove, A second gas flow path including a second inner wall on the protruding portion side of the second wall is a gas flow path leading to the second flame transfer flame hole groove and the inner flame transfer flame hole groove, The first fire-transfer flame hole groove, the second fire-transfer flame hole groove, and the inner fire-transfer flame hole groove are provided on the outer periphery of the flange portion, the first inner wall is inclined toward the second wall as it approaches the outer periphery, The second inner wall is inclined so as to approach the first wall as it approaches the outer periphery. Effect of the Invention

[0007] According to the technology disclosed herein, in a gas stove in which the protrusion of the burner cap is positioned by fitting it into a recess in the burner body, it is possible to improve ignition performance near the flame groove radially outward of the protrusion. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view that illustrates a schematic example of a gas stove according to a first embodiment. [Diagram 2] FIG. 2 is a perspective view illustrating a gas burner used in the gas stove of the first embodiment. [Diagram 3] FIG. 3 is a cross-sectional view that illustrates a schematic cross section of the gas burner of FIG. 2 taken at a position that passes through the position of the main flame hole and the central axis. [Figure 4] 4 is a cross-sectional view showing a schematic example of a cross section taken along a position (position BB in FIG. 7) passing through the flame stabilizing hole and the central axis in a configuration in which the cover body is omitted in the gas burner of FIG. 2. [Diagram 5] FIG. 5 is an exploded perspective view showing a part of the gas burner of FIG. [Figure 6] FIG. 6 is a perspective view of the burner cap body of the gas burner in FIG. 2 as viewed from below. [Figure 7] FIG. 7 is a bottom view of the burner cap body of FIG. [Figure 8] FIG. 8 is a cross-sectional view that illustrates a schematic example of a cut surface taken at a position (position CC in FIG. 7) that passes through the protrusion and the inner flame transfer flame hole groove and passes through the central axis in a configuration in which the cover body is omitted in the gas burner of FIG. 2. [Figure 9] FIG. 9 is an enlarged view showing a part of FIG. [Figure 10] FIG. 10 is an enlarged view showing the vicinity of the protruding portion in the perspective view of FIG. [Figure 11] FIG. 11 is an enlarged view showing the vicinity of the protruding portion in the bottom view of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The following describes exemplary embodiments of the present disclosure. The following exemplary features [1] to [4] may be combined in any compatible combination.

[0010] [1] A burner body that supplies gas; A burner cap including a cylindrical portion and a flange portion extending from the cylindrical portion and attached to the burner body; A gas stove having The burner body includes an upper surface portion having an annular opposing surface opposing the flange portion, and a recessed portion having a configuration recessed with respect to the upper surface portion, The burner cap includes a plurality of flame hole grooves provided on a lower surface portion of the flange portion, and a protrusion provided on the lower surface portion and inserted into the recessed portion, The plurality of flame hole grooves include a plurality of main flame hole grooves which constitute a main flame hole together with the facing surface, and a plurality of flame transfer flame hole grooves which constitute a flame transfer flame hole together with the facing surface, Some of the plurality of fire-transfer flame hole grooves are provided with a first wall disposed on one side of the protruding portion in the circumferential direction of the flange portion, a second wall disposed on the other side of the protruding portion in the circumferential direction, and a plurality of partition walls disposed between the first wall and the second wall in the circumferential direction, A first flame-transfer flame hole groove among the plurality of flame-transfer flame hole grooves includes one partition wall among the plurality of partition walls and the first wall, A second fire-transfer flame hole groove among the plurality of fire-transfer flame hole grooves includes another partition wall among the plurality of partition walls and the second wall, Among the plurality of fire-transfer flame hole grooves, the inner fire-transfer flame hole groove has the plurality of partition walls, A first gas flow passage including a first inner wall on the protruding portion side of the first wall is a gas flow passage leading to the first flame transfer flame hole groove and the inner flame transfer flame hole groove, A second gas flow path including a second inner wall on the protruding portion side of the second wall is a gas flow path leading to the second flame transfer flame hole groove and the inner flame transfer flame hole groove, The first fire-transfer flame hole groove, the second fire-transfer flame hole groove, and the inner fire-transfer flame hole groove are provided on the outer periphery of the flange portion, the first inner wall is inclined toward the second wall as it approaches the outer periphery, The second inner wall is inclined so as to approach the first wall as it approaches the outer periphery. Gas stove.

[0011] In the gas stove described in [1], the first gas flow path including the first inner wall on the protruding portion side of the first wall is a gas flow path leading to the first fire-transfer flame hole groove and the inner fire-transfer flame hole groove, and the second gas flow path including the second inner wall on the protruding portion side of the second wall is a gas flow path leading to the second fire-transfer flame hole groove and the inner fire-transfer flame hole groove. The first inner wall is inclined so as to approach the second wall as it approaches the outer periphery of the flange portion, and the second inner wall is inclined so as to approach the first wall as it approaches the outer periphery of the flange portion. Due to this configuration, in the vicinity of the protruding portion, the gas flowing in from the first inner wall side can be brought as close as possible to the second wall side and guided to the radial outside of the protruding portion, and the gas flowing in from the second inner wall side can be brought as close as possible to the first wall side and guided to the radial outside of the protruding portion. Therefore, in a gas stove in which the protrusion of the burner cap is positioned by fitting it into a recess in the burner body, it becomes easier to direct gas around the back side (radially outward) of the protrusion, improving ignition ability near the flame groove on the radial outside of the protrusion.

[0012] [2] A third inner wall constituting the first flame-transfer flame hole groove in the first wall is provided closer to the outer periphery than the first inner wall and is inclined so as to move away from the second wall as it approaches the outer periphery, A fourth inner wall constituting the second flame-transfer flame hole groove in the second wall is provided closer to the outer periphery than the second inner wall and is inclined so as to move away from the first wall as it approaches the outer periphery. A gas stove as described in [1].

[0013] In the gas stove described in [2], the gas flowing in from the first inner wall side near the protruding portion is guided by the first inner wall to the radial outside of the protruding portion, and after passing through the first inner wall, the gas flow can be spread to the side away from the second wall. Similarly, the gas flowing in from the second inner wall side near the protruding portion is guided by the second inner wall to the radial outside of the protruding portion, and after passing through the second inner wall, the gas flow can be spread to the side away from the first wall. Therefore, the gas passing near the first inner wall and near the second inner wall can be made to flow with a certain degree of spread rather than being concentrated only on the radial outside of the protruding portion, so that the ignition ability can be improved more uniformly over a wider range.

[0014] [3] A step portion is provided between the protruding portion and the plurality of partition walls, The step portion and the plurality of partition walls form a third gas flow passage that guides the gas flowing through the first gas flow passage and the second gas flow passage to the inner flame transfer hole groove. A gas stove as described in [1] or [2].

[0015] In the gas stove described in [3], the gas flowing through the first gas flow path and the second gas flow path is easily guided to the inner fire-transfer flame hole groove by the third gas flow path, thereby further improving ignition ability near the inner fire-transfer flame hole groove.

[0016] [4] The step portion covers a space defined between an inner wall portion of the recess portion and the protrusion portion from above. A gas stove as described in [3].

[0017] The gas stove described in [4] can prevent gas flowing near the protruding portion from flowing into the vicinity of the recessed portion, and can easily prevent excessive gas from flowing through the vicinity of the recessed portion into the vicinity of the inner fire-transfer flame hole groove.

[0018] First Embodiment In the following, a gas stove 1 including gas burners 4, 5, and 6 for a gas stove according to a first embodiment will be described.

[0019] 1. Overview of gas stoves 1 is a built-in stove that is incorporated into, for example, a cabinet (not shown in FIG. 1). The gas stove 1 includes gas burners (stove burners) 4, 5, and 6, a housing 2, a top plate 3, a grill unit 8, and the like.

[0020] In the following description, in the gas stove 1 shown in FIG. 1, the first direction of the plate surface directions of the top plate 3 configured in a plate shape is the front-rear direction. The plate surface direction is a planar direction parallel to a predetermined flat surface forming the upper surface of the top plate 3. In the representative example (FIG. 1, etc.) described below, the short side direction when the top plate 3 is viewed in a plane is the first direction and the front-rear direction. In the representative example (FIG. 1, etc.), the second direction perpendicular to the first direction of the plate surface directions of the top plate 3 is the left-right direction. In the representative example (FIG. 1, etc.), the longitudinal direction when the top plate 3 is viewed in a plane is the second direction and the left-right direction. The direction perpendicular to the front-rear direction and perpendicular to the left-right direction is the up-down direction. In the representative example (FIG. 1, etc.), the plate thickness direction of the top plate 3 is the third direction and the up-down direction.

[0021] The housing 2 shown in FIG. 1 is mainly made of, for example, a known metal material. The housing 2 constitutes the outer shell of the gas stove 1. The housing 2 houses the gas burners 4, 5, 6 and some or all of the other components. The housing 2 has a pair of side walls on both the left and right sides, and a rear wall (not shown in FIG. 1) is provided in a manner connected to the rear ends of the pair of side walls. The front part (not shown in FIG. 1) of the housing 2 is configured in a frame or wall shape, and has, for example, a frame portion arranged in a manner spanning the pair of side walls. Furthermore, a bottom wall (not shown in FIG. 1) is connected to the lower parts of the front part, the pair of side walls, and the rear wall. The housing 2 has an internal space surrounded by the front part, the pair of side walls, the rear wall, and the bottom wall, and has a box-like shape with an open upper end.

[0022] 1 is fixed to the upper end of the housing 2. The top plate 3 is arranged on the housing 2 in a configuration in which the top plate 3 partially or entirely closes the opening at the upper end of the housing 2. The top plate 3 has a rectangular plate shape in a plan view. The top plate 3 is provided with a plurality of openings (through holes) 3A, 3B, 3C for exposing the gas burners 4, 5, 6.

[0023] The gas burners 4, 5, and 6 shown in FIG. 1 are provided so as to correspond to the openings 3A, 3B, and 3C formed in the top plate 3, respectively. The gas burner 4 is arranged so as to be inserted into the opening 3A provided in a position near the right end and the front end of the top plate 3. The gas burner 5 is arranged so as to be inserted into the opening 3B provided in a position near the left end and the front end of the top plate 3. The gas burner 6 is arranged so as to be inserted into the opening 3C provided in the center of the top plate 3 in the left-right direction and near the rear end. A grill section 8 is provided near the center of the housing 2 in the left-right direction. The grill section 8 includes a box-shaped grill chamber (detailed illustration is omitted in FIG. 1), a grill door 8A for opening and closing the grill chamber, a grill burner (detailed illustration is omitted in FIG. 1) configured as a gas burner and arranged in the grill chamber, and the like.

[0024] As shown in FIG. 1, two ignition buttons 11, 14 are provided on the front of the gas stove 1 near the right end of the gas stove 1. Two ignition buttons 12, 13 are provided on the front of the gas stove 1 near the left end of the gas stove 1. The ignition button 11 is an operation button for igniting and extinguishing the gas burner 4. The ignition button 12 is an operation button for igniting and extinguishing the gas burner 5. The ignition button 13 is an operation button for igniting and extinguishing the gas burner 6. The ignition button 14 is an operation button for igniting and extinguishing the gas burner of the grill section 8. Each of the ignition buttons 11, 12, 13, 14 is arranged so as to be visible from the front side and operable from the front side. Each of the ignition buttons 11, 12, 13, and 14 is configured to be displaceable between a protruding position where it protrudes forward and a retracted position where it retreats rearward from the protruding position. Each of the ignition buttons 11, 12, 13, and 14 is configured to be rotatable, and the flame power of the gas burner corresponding to each button is adjusted depending on the rotation position of each of the ignition buttons 11, 12, 13, and 14.

[0025] A plurality of openings 3A, 3B, and 3C provided in the top plate 3 are through holes. A burner cap 21 constituting the head of the gas burner 4 is disposed in the opening 3A. A burner cap 22 constituting the head of the gas burner 5 is disposed in the opening 3B. A burner cap 20 constituting the head of the gas burner 6 is disposed in the opening 3C. The two burner caps 21 and 22 have the same configuration. The burner caps 21 and 22 and the burner cap 20 have the same configuration except that they are different in size. A metal trivet 7 is provided on the top plate 3 so as to surround each of the burner caps 20, 21, and 22.

[0026] 2. Overview of gas burners The configuration and operation of the gas burner 6 will be mainly described in detail below. 2 to 5, the gas burner 6 includes a burner body 6A and a burner cap 20 attached to the burner body 6A. As shown in Fig. 1, the gas burner 6 is supported within the housing 2 and fixed directly to the housing 2 or indirectly via another member. The gas burner 6 straddles the upper and lower sides of the top plate 3 through an opening 3C.

[0027] The burner body 6A shown in Figs. 2 to 5 is a component for supplying combustion gas, and is also a component for supporting the burner cap 20 from the lower side while holding the burner cap 20. The burner body 6A is also a component for constituting a path (flow path) for supplying combustion gas from a combustion gas flow path provided outside the burner body 6A toward the burner cap 20. As shown in Fig. 3, the burner body 6A mainly comprises a cylindrical lower-positioned part 6B and a throat part 6C connected to the lower-positioned part 6B. The lower-positioned part 6B is a part facing the burner cap 20 from the lower side. The lower-positioned part 6B is a part that forms a mixed gas chamber 6Z inside itself, and is configured to surround the outside of the space inside the mixed gas chamber 6Z. The lower-positioned part 6B receives and supports, for example, the flange part 32 of the burner cap body 30. The throat part 6C is a cylindrical part extending from the lower-positioned part 6B, and is a part that constitutes a pipe for flowing gas. The throat portion 6C functions as a mixing tube that mixes the fuel gas and the combustion air. The mixture chamber 6Z shown in FIG. 3 communicates with the inside of the throat portion 6C (FIG. 2). The mixture chamber 6Z forms a space that mixes the fuel gas and the combustion air supplied through the throat portion 6C. The combustion gas in the mixture chamber 6Z spreads radially outward of the burner cap 20 and is discharged from the outer periphery of the flange portion 32 through each flame hole 70. The flame holes 70 are, specifically, any one of a main flame hole 71, a flame transfer flame hole 72, and a flame holding hole 73.

[0028] The burner cap 20 shown in Figs. 2 to 5 functions as a burner head. As shown in Fig. 3, the burner cap 20 is a part that is attached to the burner body 6A and is a part that is arranged above the lower arrangement part 6B. The burner cap 20 is configured to be annular as a whole. The burner cap 20 includes an annular burner cap body 30 and a cover body 40 that is fixed to the burner cap body 30. The burner cap 20 is formed by assembling the burner cap body 30 and the cover body 40 to each other. The burner cap body 30 is a part in which a burner hole groove 110 is formed on its outer periphery. The cover body 40 is a part that covers the burner cap body 30. As shown in Fig. 1, an ignition electrode 10 and a thermocouple (not shown) for flame detection are provided near any one of the burner hole grooves 110. Although only the symbols of some of the burner hole grooves 110 are shown in Figs. 2 to 5 and the like, a large number of burner hole grooves 110 are formed over the entire circumferential direction of the burner cap body 30.

[0029] 2 to 4, the temperature sensor 9 is disposed so as to penetrate the center of the lower portion 6B and the burner cap 20. The temperature sensor 9 functions to detect the temperature of the bottom of the cookware (such as a cooking pot) by contacting the bottom of the cookware placed on the trivet 7. In Figs. 3 and 4, components other than the temperature sensor 9 are shown in cross section, and the temperature sensor 9 is shown in a schematic configuration viewed from the side.

[0030] In the gas stove 1 shown in Fig. 1, for example, when an ignition operation (pressing operation) is performed on the ignition button 13, fuel gas is supplied to the burner body 6A shown in Figs. 2 to 4 together with primary air, and the mixture flows out from a number of flame hole grooves 110 of the burner cap 20 attached to the burner body 6A. When an ignition operation (pressing operation) is performed on the ignition button 13, a controller (not shown) provided inside the gas stove 1 sparks the electrode 10 adjacent to the burner cap 20 shown in Figs. 2 to 4 to ignite the mixture, and a flame is generated around the burner cap 20. This allows the bottom of a cooking utensil placed on the trivet 7 around the burner cap 20 to be heated, making it possible to cook.

[0031] 3. Details of the burner body 2 and 5, the burner body 6A has a configuration in which a lower portion 6B and a throat portion 6C are integrally connected. The lower portion 6B is a cylindrical base on which the burner cap 20 is attached. The lower portion 6B includes a cylindrical portion 60 and a lower connecting portion 74.

[0032] As shown in FIG. 5, the cylindrical portion 60 is cylindrical and constitutes the upper end side of the burner body 6A. The cylindrical portion 60 constitutes the inner wall portion of the outer side of the mixed gas chamber 6Z. The cylindrical portion 60 includes an inner circumferential wall portion 62, an outer circumferential wall portion 64, and an upper surface portion 66. The inner circumferential wall portion 62 is cylindrical and constitutes the inner wall portion of the outer side of the mixed gas chamber 6Z. The inner circumferential surface of the inner circumferential wall portion 62 is a cylindrical surface centered on a predetermined central axis G shown in FIG. 3. The outer circumferential wall portion 64 is cylindrically configured to surround the inner circumferential wall portion 62. The upper surface portion 66 connects the upper end of the inner circumferential wall portion 62 and the upper end of the outer circumferential wall portion 64. The upper surface portion 66 constitutes the upper end portion of the burner body 6A. The upper surface portion 66 is arranged in an annular shape. The upper surface portion 66 is provided with an opposing surface 66A. The upper surface portion 66 is a portion constituting a part of each burner hole 70. The facing surface 66A is an annular surface facing the flange portion 32 (annular portion) of the burner cap 20. The facing surface 66A is a surface arranged facing the lower surface portion 35 of the flange portion 32, and more specifically, a surface arranged facing at least the groove forming portion 35B. The facing surface 66A is arranged facing each burner hole groove 110. The facing surface 66A constitutes a part of the inner surface of each burner hole 70 (main burner hole 71, flame transfer burner hole 72, flame holding hole 73). The facing surface 66A is arranged in an annular shape centered on the central axis G. The facing surface 66A is an inclined surface that becomes lower as it approaches the inside (the inner peripheral wall portion 62 side), and is configured in a mortar shape as a whole. The facing surface 66A has a smaller diameter (diameter) centered on the central axis G as it approaches the lower position. The opposing surface 66A desirably functions as a support surface that supports the flange portion 32 of the burner cap body 30 from below.

[0033] A lower connecting portion 74 is provided below the cylindrical portion 60 and connected to the cylindrical portion 60. The lower connecting portion 74 includes an annular outer wall portion 75 connected to the inner circumferential wall portion 62, a bottom wall portion 78 connected to the lower end of the outer wall portion 75, and a cylindrical support tube 76 rising upward from the bottom wall portion 78. The upper end of the outer wall portion 75 is connected to the lower end of the inner circumferential wall portion 62, and the outer wall portion 75 and the inner circumferential wall portion 62 form an outer inner wall portion (annular wall portion) of the mixture chamber 6Z. The bottom wall portion 78 functions as a bottom wall of the mixture chamber 6Z. The support tube 76 is disposed across the inner region of the inner circumferential wall portion 62 and the inner region of the outer wall portion 75 in the vertical direction. The support tube 76 is cylindrical with the central axis G as its center, and has an open upper end. The tube portion 31 of the burner cap body 30 is inserted into the support tube 76 from above. The tube portion 31 and the support tube 76 form an inner wall portion (annular wall portion) on the inside of the mixed gas chamber 6Z. The outer wall portion 75 is integrally formed with the throat portion 6C. The internal space of the outer wall portion 75 (the space inside the mixed gas chamber 6Z) is configured so that gas can flow in from the internal space of the throat portion 6C.

[0034] 4. Burner cap details The following description relates to the detailed construction of the burner cap 20. As shown in Figs. 2 to 5, the burner cap body 30 is attached to the burner body 6A from above. The burner cap body 30 is attached to the burner body 6A. The cover body 40 is disposed above the burner cap body 30 so as to cover the burner cap body 30, and is fixed to the burner cap body 30. The burner cap body 30 is cylindrical. The burner cap body 30 is made of a metal material such as aluminum die casting. The burner cap body 30 includes a cylindrical tube portion 31 and a flange portion 32 extending from the upper end side of the tube portion 31.

[0035] As shown in FIG. 3, the tubular portion 31 is configured in a cylindrical shape so that a predetermined central axis G is the center of the cylinder, and extends in the direction of the central axis G along the central axis G. The direction of the central axis G is, for example, the vertical direction. In the example of FIG. 3, the direction in which the tubular portion 31 extends is the vertical direction. The inner peripheral surface of the tubular portion 31 is configured as a cylindrical surface centered on the central axis G or an annular surface along a cylindrical surface centered on the central axis G. The outer peripheral surface of the tubular portion 31 is also configured as a cylindrical surface centered on the central axis G or an annular surface along a cylindrical surface centered on the central axis G. The upper end of the tubular portion 31 forms an opening at the upper end of the burner cap 20. The lower end of the tubular portion 31 forms an opening at the lower end of the burner cap 20. A through hole 36 extending vertically is formed in the center of the burner cap body 30. The through hole 36 is configured to allow gas to pass in the vertical direction. The inner periphery of the cylindrical portion 31 defines a through hole 36 , which functions as a hole continuing from the upper end to the lower end of the burner cap 20 .

[0036] As shown in FIG. 3, the flange portion 32 is configured as a brim-shaped portion (projecting portion) that projects outward in the radial direction centered on the central axis G from a portion near the upper end of the tubular portion 31. The radial direction centered on the central axis G is each direction that passes through the central axis G and is perpendicular to the central axis G. In this specification, the radial direction centered on the central axis G is also simply referred to as the radial direction. The flange portion 32 corresponds to an example of an annular portion. The flange portion 32 is connected to a portion on the upper end side of the tubular portion 31 and is configured as a portion that projects outward in the radial direction centered on the central axis G from the portion on the upper end side. The flange portion 32 and the tubular portion 31 are integrally configured, for example, by the same metal material. The flange portion 32 is provided with an upper surface portion 34. The upper surface portion 34 is a portion that constitutes an upper plate surface of the flange portion 32. The second protruding portion 43 of the cover body 40 comes into contact with the upper surface portion 34. The surface (upper surface) of the upper surface portion 34 is an annular surface along a plane perpendicular to the central axis G. A plurality of burner hole grooves 110 are provided in the lower surface portion 35 of the flange portion 32. In a state in which the burner cap 20 is attached to the burner body 6A as shown in FIG. 3, the lower surface portion 35 of the flange portion 32 is disposed opposite the opposing surface 66A of the burner body 6A. In the attached state of FIG. 3, it is desirable that the lower surface portion 35 of the flange portion 32 is placed so as to come into contact with the opposing surface 66A.

[0037] As shown in Figures 3 and 5, the cover body 40 is configured as a circular annular plate. The cover body 40 is made of metal (e.g., stainless steel). As shown in Figures 2, 3, and 5, the cover body 40 has a main body portion 41, a first protruding portion 42, and a second protruding portion 43. In the cover body 40, the main body portion 41, the first protruding portion 42, and the second protruding portion 43 are integrally formed from the same material.

[0038] As shown in Figs. 3 and 5, the main body 41 is configured as a circular annular plate that covers the flange 32 of the burner cap main body 30 from above. As shown in Fig. 3, the first protrusion 42 is configured to be bent from the main body 41 by, for example, metal processing (bending, etc.). The second protrusion 43 is configured to be bent from the main body 41 by, for example, metal processing (bending, etc.). The cover body 40 is surface-treated (for example, barrel polishing, etc.) to have a smooth and glossy configuration. In the center of the cover body 40, a through hole 44 having a diameter approximately the same as that of the through hole 36 of the burner cap main body 30 is provided so as to penetrate the main body 41 in the thickness direction. The through hole 44 is arranged in communication with the through hole 36 so as to continue to the upper part of the internal space of the above-mentioned through hole 36.

[0039] As shown in FIG. 3 and FIG. 5, the first protrusion 42 protrudes downward from the circular inner edge of the main body 41. The protruding length of the first protrusion 42 is greater than the protruding length of the second protrusion 43. The first protrusion 42 is cylindrical. The first protrusion 42 is inserted into the tubular portion 31. The first protrusion 42 is fixed to the tubular portion 31 while contacting the inner periphery 39 of the tubular portion 31. Specifically, a recess 50 is provided in the inner periphery 39 of the tubular portion 31, and a hook portion 47 forming a part of the first protrusion 42 is inserted into the recess 50 and hooked on the recess 50, so that the first protrusion 42 does not come off from the tubular portion 31. With this configuration, the cover body 40 is fixed to the burner cap main body 30.

[0040] 5. Structure around the protruding part As shown in Fig. 5, the burner body 6A includes an upper surface portion 66 having an annular opposing surface 66A opposing the flange portion 32, and a recessed portion 66Z recessed into the upper surface portion 66. The opposing surface 66A is a support surface on which the flange portion 32 is placed. The lower surface portion 35 of the flange portion 32 comes into contact with the opposing surface 66A. The lower surface portion 35 constitutes the lower surface of the flange portion 32. The opposing surface 66A is a mortar-shaped tapered surface, and has an upwardly expanding shape with a diameter (diameter centered on the central axis G) increasing toward the upper position.

[0041] The recessed portion 66Z is formed on the upper surface portion 66 and on the inner peripheral wall portion 62. The recessed portion 66Z is configured as a recess recessed downward on the upper surface portion 66, and is configured as a groove portion extending in the vertical direction on the inner peripheral wall portion 62. The recessed portion 66Z is a recessed portion and a groove portion into which the protruding portion 160 fits, and when the protruding portion 160 fits, the recessed portion 66Z restricts the protruding portion 160 from rotating in the circumferential direction around the central axis line G. In the mounting state in which the protruding portion 160 fits into the recessed portion 66Z (the state in which the burner cap 20 is mounted on the burner body 6A), the protruding portion 160 is allowed to move upward while maintaining a posture along the vertical direction, and is restricted (prohibited) from rotating in the circumferential direction or moving downward. Therefore, the recessed portion 66Z restricts the burner cap 20 from rotating around the central axis line G when the burner cap 20 is mounted on the burner body 6A. The recess of the recessed portion 66Z spans between the upper surface portion 66 and the inner circumferential wall portion 62. The recessed portion 66Z is recessed downward from the opposing surface 66A, and is recessed in the inner circumferential wall portion 62 toward the outside in the radial direction.

[0042] As shown in FIG. 6 and FIG. 7, the burner cap 20 includes a plurality of burner hole grooves 110 and a protruding portion 160. The plurality of burner hole grooves 110 are configured as grooves that allow gas to flow from the inside (the cylindrical portion 31 side) to the outside (the outer peripheral portion 33 side) on the lower surface side of the flange portion 32. The plurality of burner hole grooves 110 are provided on the lower surface portion 35 of the flange portion 32, and are configured as grooves that extend in a radial direction centered on the central axis G or grooves that extend in a direction slightly inclined with respect to the radial direction. Each burner hole groove 110 is a groove that allows gas to flow from the central axis G side to the outer peripheral portion 33 side, and has two wall portions that face each other in the circumferential direction and an upper wall portion, and is a groove that is open on the lower side. Each burner hole groove 110 communicates the space below the annular portion 35A and the space outside the outer peripheral portion 33, and allows gas to flow between these spaces. Each burner hole groove 110 constitutes a part of each burner hole 70. The underside portion 35 is disposed so as to close the lower side of each burner hole groove 110, thereby forming each burner hole 70. Each burner hole 70 is a flow path that allows gas to flow from the central axis G side to the outer circumferential portion 33 side. Each burner hole 70 connects the space below the annular portion 35A to the space outside the outer circumferential portion 33, and is a flow path that allows gas to flow between these spaces. Gas present in the space below the annular portion 35A (the space inside the mixture chamber 6Z) is designed to pass through each burner hole 70 and be released from the outer circumferential portion 33.

[0043] As shown in Figs. 6 and 7, the underside 35 of the flange 32 has an annular portion 35A that is connected to the tubular portion 31 and protrudes from the tubular portion 31, and a groove portion 35B that is annularly provided around the annular portion 35A. The annular portion 35A is an annular non-forming region where no burner hole grooves 110 are formed. The groove portion 35B is provided between the annular portion 35A and the outer circumferential portion 33 on the underside 35, and is configured with a number of protrusions that protrude downward. The multiple burner hole grooves 110 are lined up in a large number in the circumferential direction in a region away from the tubular portion 31. Each burner hole groove 110 is open on the lower side, and the open lower side is blocked by the opposing surface 66A. As shown in Figures 6, 7 and 10, the multiple flame hole grooves 110 include a plurality of main flame hole grooves 120 which, together with the opposing surface 66A, form the main flame hole 71, a plurality of fire transfer flame hole grooves 130 which, together with the opposing surface 66A, form the fire transfer flame hole 72, and a plurality of flame holding hole grooves 128 which, together with the opposing surface 66A, form the flame holding hole 73 (see also Figures 2 to 5, 8, etc.).

[0044] Of the flame hole grooves 110, the main flame hole groove 120 is a groove that forms a path that guides the gas supplied from the burner body 6A from the center side to the outside of the flange portion 32. As shown in Figures 2 and 3, the main flame hole groove 120 forms a main flame hole 71 between itself and the opposing surface 66A of the burner body 6A. Specifically, each main flame hole 71 is formed by each main flame hole groove 120 and the upper surface portion 66. The inner wall surface of each main flame hole 71 is formed by the inner wall surface of each main flame hole groove 120 and the opposing surface 66A.

[0045] Of the flame hole grooves 110, the flame stabilizing hole grooves 128 are grooves that form a path that guides the gas supplied from the burner body 6A from the center side to the outside of the flange portion 32. The vertical size (depth) of the flame stabilizing hole grooves 128 is smaller than the vertical size (depth) of the main flame hole grooves 120. As shown in Figs. 2 and 4, the flame stabilizing hole grooves 128 form flame stabilizing holes 73 between themselves and the opposing surface 66A of the burner body 6A. Specifically, each flame stabilizing hole 73 is formed by each flame stabilizing hole groove 128 and the upper surface portion 66. The inner wall surface of each flame stabilizing hole 73 is formed by the inner wall surface of each flame stabilizing hole groove 128 and the opposing surface 66A.

[0046] Among the flame hole grooves 110, the fire transfer flame hole groove 130 is provided between the two main flame hole grooves 120, and is a groove that constitutes the fire transfer flame hole 72 between the opposing surface 66A. Specifically, each fire transfer flame hole 72 is constituted by each fire transfer flame hole groove 130 and the upper surface portion 66. The inner wall surface of each fire transfer flame hole 72 is constituted by the inner wall surface of each fire transfer flame hole groove 130 and the opposing surface 66A. The fire transfer flame hole 72 is a flame hole that releases gas to generate a flame that transfers a flame generated near one main flame hole 71 to the other main flame hole 71 between two main flame holes 71 arranged on both sides (both circumferential sides) of the fire transfer flame hole groove 130. The size of the upper and lower grooves (groove depth) of the fire transfer flame hole groove 130 is smaller than the size of the upper and lower grooves (groove depth) of the main flame hole groove 120. Specifically, regardless of which fire-transfer flame hole groove 130 is focused on, the maximum depth of the fire-transfer flame hole groove 130 is smaller than the maximum depth of the main flame hole groove 120 closest to it on one circumferential side of it, and is smaller than the maximum depth of the main flame hole groove 120 closest to it on the other circumferential side of it.

[0047] As shown in Figs. 6, 8 and 9, the protruding portion 160 is a protrusion provided on the lower surface portion 35 so as to protrude downward. The downward protrusion of the protruding portion 160 is greater than the downward protrusion of each wall portion constituting the plurality of burner hole grooves 110. The lower end position of the protruding portion 160 is lower than the lowermost end position of the plurality of burner hole grooves 110. The protruding portion 160 is disposed by entering into the recessed portion 66Z when the burner cap 20 is attached to the burner body 6A. When the burner cap 20 is attached to the burner body 6A, the tube portion 31 is inserted into the support tube 76, so that the movement of the tube portion 31 in the radial direction (the radial direction centered on the central axis G) is restricted. In other words, when the burner cap 20 is attached to the burner body 6A, the burner cap 20 is in a movement restricted state in which it does not move in the horizontal direction (the planar direction perpendicular to the central axis G). Furthermore, since the protrusion 160 fits into the recessed portion 66Z, rotation of the cylindrical portion 31 around the central axis G within the support cylinder 76 is restricted, and the burner cap 20 is positioned so as not to rotate around the central axis G.

[0048] 10 and 11, the first fire transfer flame hole groove 131, the second fire transfer flame hole groove 132, and the inner fire transfer flame hole groove 133 are part of the multiple fire transfer flame hole grooves 130. The first fire transfer flame hole groove 131, the second fire transfer flame hole groove 132, and the inner fire transfer flame hole groove 133 form a fire transfer flame hole groove group on the radially outer side of the protruding portion 160, and this fire transfer flame hole groove group includes a first wall 141 arranged on one side of the protruding portion 160 in the circumferential direction of the flange portion 32, a second wall 142 arranged on the other side of the protruding portion 160 in the circumferential direction, and multiple partition walls 144 arranged between the first wall 141 and the second wall 142 in the circumferential direction. The first flame-transfer flame hole groove 131, the second flame-transfer flame hole groove 132, and the inner flame-transfer flame hole groove 133 are provided between the first main flame hole groove 120X and the second main flame hole groove 120Y in the circumferential direction of the flange portion 32, and are flame holes that emit gas so as to generate a flame that transfers a flame generated in one of them to the other. The circumferential direction of the flange portion 32 is a direction along the surface (outer peripheral surface) of the outer peripheral portion 33 in the flange portion 32. For example, when a virtual plane is defined that passes through the upper end positions (the uppermost positions of the multiple main flame hole grooves 120) of the multiple main flame hole grooves 120 present in the flange portion 32 and is perpendicular to the central axis G, and when a virtual circle (the largest virtual circle when multiple virtual circles can be set) is defined on the virtual plane with the central axis G as its center and passing through the position of the surface (outer peripheral surface) of the outer peripheral portion 33, the direction of this virtual circle (circumferential direction) may be the circumferential direction of the flange portion 32.

[0049] As shown in FIG. 10 and FIG. 11, the partition walls 144 include one partition wall 144A and another partition wall 144B. The first fire-transfer flame hole groove 131 is formed by using the one partition wall 144A and the first wall 141 as components. The first fire-transfer flame hole groove 131 is a groove in which the one partition wall 144A and the first wall 141 are arranged apart from each other and have an upper wall portion (upper wall in the groove) connecting the one partition wall 144A and the first wall 141, and is formed as a flow path through which gas flows toward the outlet 131A between the one partition wall 144A and the first wall 141. The outlet 131A is an exhaust port including a radially outer end of the first wall 141 and a radially outer end of the one partition wall 144A. The second fire-transfer flame hole groove 132 is formed by using the other partition wall 144B and the second wall 142 as components. The second fire-transfer flame hole groove 132 is a groove in which the other partition wall 144B and the second wall 142 are arranged apart from each other and have an upper wall portion (upper wall in the groove) connecting the other partition wall 144B and the second wall 142, and is configured as a flow path through which gas flows toward the outlet 132A between the other partition wall 144B and the second wall 142. The outlet 132A is an exhaust port configured including the radially outer end of the second wall 142 and the radially outer end of the other partition wall 144B. The inner fire-transfer flame hole groove 133 is configured with the one partition wall 144A and the other partition wall 144B as components. The inner flame transfer flame hole groove 133 is a groove in which one partition wall 144A and another partition wall 144B are arranged apart from each other and have an upper wall portion (upper wall in the groove) connecting the one partition wall 144A and the other partition wall 144B, and is configured as a flow path through which gas flows toward the outlet 133A. The outlet 133A is an exhaust port configured to include a radially outer end of the one partition wall 144A and a radially outer end of the other partition wall 144B.

[0050] As shown in FIG. 10 and FIG. 11, the first wall 141 constituting a part of the first flame-transfer flame hole groove 131 includes a first inner wall 141A, which is an inner wall on the protruding portion 160 side, and a third inner wall 141C, which is provided on the outer peripheral portion 33 side from the first inner wall 141A. The first inner wall 141A and the third inner wall 141C are configured so that the end of the first inner wall 141A constitutes the end of the third inner wall 141C. The first inner wall 141A and the third inner wall 141C are arranged on the back side (opposite sides in the circumferential direction) of the inner wall on one side of the groove of the main flame hole groove 120X, and the first wall 141 and the inner wall on one side of the groove of the main flame hole groove 120X are provided on a common protrusion (protrusion protruding downward). This common protrusion is configured to protrude downward from the upper wall of the groove of the first flame-transfer flame hole groove 131 and the upper wall of the groove of the main flame hole groove 120X. At least a part of the first inner wall 141A faces the base end of the protruding portion 160 in the circumferential direction. The first gas flow passage 151 is configured with the first inner wall 141A, the base end of the protruding portion 160 (specifically, the part of the base end on the first inner wall 141A side), and an upper wall part (upper part of the inner wall in the groove) arranged between the base end and the first inner wall 141A, and is a flow passage that flows gas radially outward between the first inner wall 141A and the base end of the protruding portion 160. The "base end of the protruding portion 160" that constitutes a part of the first gas flow passage 151 is a root part of the protruding portion 160, a part that is provided away from the first inner wall 141A and arranged facing the first inner wall 141A, and is an inner wall of the groove that flows gas between the first inner wall 141A and the base end. The first gas flow passage 151 is a gas flow passage that leads to the first fire-transfer flame hole groove 131 and the inner fire-transfer flame hole groove 133. That is, the gas that flows through the first gas flow passage 151 branches into the first fire-transfer flame hole groove 131 and the inner fire-transfer flame hole groove 133. The first inner wall 141A is inclined so as to approach the second wall 142 as it approaches the outer circumferential portion 33. In the example of FIG. 11, the direction of the first inner wall 141A is a direction that approaches the imaginary plane L as it becomes radially outward. The imaginary plane L is a plane that passes through the central axis G and the center of the protruding portion 160. The first gas flow passage 151 is a direction that flows toward the one partition wall 144A side. The third inner wall 141C is inclined so as to move away from the second wall 142 as it approaches the outer circumferential portion 33.In the first fire-transfer flame hole groove 131, the region where the third inner wall 141C and one partition wall 144A face each other in the circumferential direction has a width (circumferential groove width) that increases toward the outer circumferential portion 33.

[0051] The second wall 142 constituting a part of the second flame-transfer flame hole groove 132 includes a second inner wall 142B, which is an inner wall on the protruding portion 160 side, and a fourth inner wall 142D provided on the outer peripheral portion 33 side from the second inner wall 142B. The second inner wall 142B and the fourth inner wall 142D are configured so that the end of the second inner wall 142B constitutes the end of the fourth inner wall 142D. The second inner wall 142B and the fourth inner wall 142D are arranged on the back side (opposite sides in the circumferential direction) of the inner wall on one side of the groove of the main flame hole groove 120Y, and the second wall 142 and the inner wall on one side of the groove of the main flame hole groove 120Y are provided on a common protrusion (protrusion protruding downward). This common protrusion is configured to protrude downward from the upper wall of the groove of the second flame-transfer flame hole groove 132 and the upper wall of the groove of the main flame hole groove 120Y. At least a part of the second inner wall 142B faces the base end of the protruding portion 160 in the circumferential direction. The second gas flow passage 152 is configured with the second inner wall 142B, the base end of the protruding portion 160 (specifically, the part of the base end on the second inner wall 142B side), and an upper wall part (upper part of the inner wall in the groove) arranged between the base end and the second inner wall 142B, and is a flow passage that flows gas radially outward between the second inner wall 142B and the base end of the protruding portion 160. The "base end of the protruding portion 160" that constitutes a part of the second gas flow passage 152 is a root part of the protruding portion 160, is a part that is provided away from the second inner wall 142B and is arranged facing the second inner wall 142B, and is an inner wall of the groove that flows gas between the second inner wall 142B and the base end of the protruding portion 160. The second gas flow passage 152 is a gas flow passage that leads to the second fire-transfer flame hole groove 132 and the inner fire-transfer flame hole groove 133. That is, the gas that flows through the second gas flow passage 152 branches into the second fire-transfer flame hole groove 132 and the inner fire-transfer flame hole groove 133. The second inner wall 142B is inclined so as to approach the first wall 141 as it approaches the outer periphery 33. In the example of FIG. 11, the second inner wall 142B is oriented so as to approach the imaginary plane L as it moves radially outward. The second gas flow passage 152 flows toward the other partition wall 144B. The fourth inner wall 142D is inclined so as to move away from the first wall 141 as it approaches the outer periphery 33. In the second flame transfer hole groove 132, the region where the fourth inner wall 142D and the other partition wall 144B face each other in the circumferential direction has a width (circumferential groove width) that increases as it approaches the outer circumferential portion 33.

[0052] The distance between the first inner wall 141A and the second inner wall 142B (the distance in the direction perpendicular to the imaginary plane L) becomes narrower toward the outer circumferential portion 33. The distance between the third inner wall 141C and the fourth inner wall 142D (the distance in the direction perpendicular to the imaginary plane L) becomes wider toward the outer circumferential portion 33.

[0053] On the outer periphery 33 of the flange portion 32, respective outlets 131A, 132A, 133A of a first fire-transfer flame hole groove 131, a second fire-transfer flame hole groove 132, and an inner fire-transfer flame hole groove 133 are provided.

[0054] 9 to 11, a step portion 170 is provided between the protruding portion 160 and the multiple partition walls 144. As shown in Fig. 10 and 11, the step portion 170 and the multiple partition walls 144 form a third gas flow passage 153 that guides the gas flowing through the first gas flow passage 151 and the second gas flow passage 152 to the inner flame transfer hole groove 133. The step portion 170 covers the space formed between the inner wall portion of the recessed portion 66Z and the protruding portion 160 from above.

[0055] 6.Examples of Effects In the gas stove 1, a first gas flow passage 151 including a first inner wall 141A on the protruding portion 160 side of the first wall 141 serves as a gas flow passage leading to the first fire-transfer flame hole groove 131 and the inner fire-transfer flame hole groove 133, and a second gas flow passage 152 including a second inner wall 142B on the protruding portion 160 side of the second wall 142 serves as a gas flow passage leading to the second fire-transfer flame hole groove 132 and the inner fire-transfer flame hole groove 133. The first inner wall 141A is inclined so as to approach the second wall 142 as it approaches the outer periphery 33 of the flange portion 32, and the second inner wall 142B is inclined so as to approach the first wall 141 as it approaches the outer periphery 33 of the flange portion 32. Due to this configuration, in the vicinity of the protruding portion 160, the gas flowing in from the first inner wall 141A side can be guided to the radially outer side of the protruding portion 160 so as to move as close as possible to the second wall 142, and the gas flowing in from the second inner wall 142B side can be guided to the radially outer side of the protruding portion 160 so as to move as close as possible to the first wall 141. Therefore, in the gas stove 1 in which the protruding portion 160 of the burner cap 20 is positioned by fitting it into the recessed portion 66Z of the burner body 6A, it is easy to make the gas flow around the back side of the protruding portion 160 (the radially outer side opposite to the central axis), and the ignition ability in the vicinity of the flame groove on the radially outer side of the protruding portion 160 can be improved.

[0056] In the gas stove 1, the gas flowing in from the first inner wall 141A side in the vicinity of the protruding portion 160 is guided by the first inner wall 141A to the radial outside of the protruding portion 160, and after passing through the first inner wall 141A, the flow of the gas can be spread to the side away from the second wall 142. Similarly, the gas flowing in from the second inner wall 142B side in the vicinity of the protruding portion 160 is guided by the second inner wall 142B to the radial outside of the protruding portion 160, and after passing through the second inner wall 142B, the flow of the gas can be spread to the side away from the first wall 141. Therefore, the gas passing in the vicinity of the first inner wall 141A and the vicinity of the second inner wall 142B can be made to flow with a certain degree of spread, rather than being concentrated only on the back side (radial outside) of the protruding portion 160, so that the ignition ability can be improved more uniformly over a wider range. It can be made to flow not only to the 133A but also to the fire transfer flame holes on both sides.

[0057] In the gas stove 1, the gas flowing through the first gas flow passage 151 and the second gas flow passage 152 is easily guided to the inner fire-transfer flame hole groove 133 by the third gas flow passage 153, thereby further improving the ignition ability near the inner fire-transfer flame hole groove 133.

[0058] The gas stove 1 can prevent gas flowing near the protrusion 160 from flowing into the vicinity of the recessed portion 66Z due to the presence of the step portion 170, making it easier to prevent excessive gas from flowing through the vicinity of the recessed portion 66Z into the vicinity of the inner fire-transfer flame hole groove 133.

[0059] <Other embodiments> The present invention is not limited to the embodiments described above and in the drawings. For example, the features of the above or later described embodiments can be combined in any combination within a range that does not contradict. Furthermore, any feature of the above or later described embodiments can be omitted unless it is clearly stated as essential. Furthermore, the above described embodiments may be modified as follows.

[0060] In the above description of the embodiment, the gas stove 1 configured as a built-in stove has been given as an example of a stove, but the stove may be other types of stoves such as a table stove.

[0061] In the above embodiment, the partition walls 144 are each composed of one partition wall 144A and another partition wall 144B, but three or more partition walls may be provided spaced apart in the circumferential direction. In this case, two or more inner fire-transfer flame hole grooves may be provided, each formed by adjacent partition walls in the three or more partition walls.

[0062] In the above embodiment, the first inner wall 141A has an inner wall surface that is linearly inclined so as to approach the second wall 142 as it approaches the outer circumferential portion 33, but may have an inner wall surface that is curved and inclined so as to approach the second wall 142 as it approaches the outer circumferential portion 33. Similarly, in the above embodiment, the second inner wall 142B has an inner wall surface that is linearly inclined so as to approach the first wall 141 as it approaches the outer circumferential portion 33, but may have an inner wall surface that is curved and inclined so as to approach the first wall 141 as it approaches the outer circumferential portion 33.

[0063] In the above embodiment, the third inner wall 141C has an inner wall surface that is inclined so as to move away from the second wall 142 as it approaches the outer circumferential portion 33, but may have an inner wall surface that is curved and inclined so as to move away from the second wall 142 as it approaches the outer circumferential portion 33. Similarly, the fourth inner wall 142D has an inner wall surface that is inclined so as to move away from the first wall 141 as it approaches the outer circumferential portion 33, but may have an inner wall surface that is curved and inclined so as to move away from the first wall 141 as it approaches the outer circumferential portion 33.

[0064] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is not limited to the embodiments disclosed herein, and is intended to include all modifications within the scope indicated by the claims or within the scope equivalent to the claims. [Explanation of symbols]

[0065] 1: Gas stove 4: Gas burner 5: Gas burner 6: Gas burner 6A: Burner body 20: Burner cap 21: Burner cap 22: Burner cap 31:Cylinder part 32: Flange part 33: Outer periphery 35: Bottom part 66:Top part 66A: Opposite surface 66Z: Recess 70 flame hole 71 Main flame hole 72 Fire-transfer hole 110 Flame hole groove 120 Main flame hole groove 130 Fire-transfer groove 131 First fire-transfer groove 131A Exit 132 Second fire-transfer groove 132A Exit 133 Inner fire hole groove 133A Exit 141 1st wall 141A 1st inner wall 141C 3rd inner wall 142 Second wall 142B 2nd inner wall 142D 4th inner wall 144 Partition Wall 144A First Compartment Wall 144B Other partition walls 151 First gas flow path 152 Second gas flow path 153 Third gas flow path 160 Protrusion 170 Step

Claims

1. A burner body for supplying gas; A burner cap including a cylindrical portion and a flange portion extending from the cylindrical portion and attached to the burner body; A gas stove having The burner body includes an upper surface portion having an annular opposing surface opposing the flange portion, and a recessed portion having a configuration recessed with respect to the upper surface portion, The burner cap includes a plurality of flame hole grooves provided on a lower surface portion of the flange portion, and a protrusion provided on the lower surface portion and inserted into the recessed portion, The plurality of flame hole grooves include a plurality of main flame hole grooves which constitute a main flame hole together with the facing surface, and a plurality of flame transfer flame hole grooves which constitute a flame transfer flame hole together with the facing surface, Some of the plurality of fire-transfer flame hole grooves are provided with a first wall disposed on one side of the protruding portion in the circumferential direction of the flange portion, a second wall disposed on the other side of the protruding portion in the circumferential direction, and a plurality of partition walls disposed between the first wall and the second wall in the circumferential direction, A first fire-transfer flame hole groove among the plurality of fire-transfer flame hole grooves includes one partition wall among the plurality of partition walls and the first wall, A second fire-transfer flame hole groove among the plurality of fire-transfer flame hole grooves includes another partition wall among the plurality of partition walls and the second wall, Among the plurality of fire-transfer flame hole grooves, the inner fire-transfer flame hole groove has the plurality of partition walls, a first gas flow passage including a first inner wall on the protruding portion side of the first wall is a gas flow passage leading to the first flame transfer flame hole groove and the inner flame transfer flame hole groove, a second gas flow passage including a second inner wall on the protruding portion side of the second wall is a gas flow passage leading to the second flame transfer flame hole groove and the inner flame transfer flame hole groove, The flange portion has an outer periphery provided with outlets of the first fire-transfer flame hole groove, the second fire-transfer flame hole groove, and the inner fire-transfer flame hole groove, the first inner wall is inclined toward the second wall as it approaches the outer periphery, The second inner wall is inclined so as to approach the first wall as it approaches the outer periphery. Gas stove.

2. A third inner wall constituting the first flame-transfer flame hole groove in the first wall is provided closer to the outer periphery than the first inner wall and is inclined so as to move away from the second wall as it approaches the outer periphery, A fourth inner wall constituting the second flame-transfer flame hole groove in the second wall is provided closer to the outer periphery than the second inner wall and is inclined so as to move away from the first wall as it approaches the outer periphery.

2. The gas stove of claim 1.

3. A step portion is provided between the protruding portion and the plurality of partition walls, The step portion and the plurality of partition walls form a third gas flow passage that guides the gas flowing through the first gas flow passage and the second gas flow passage to the inner flame transfer hole groove. A gas stove according to claim 1 or 2.

4. The step portion covers a space defined between an inner wall portion of the recess portion and the protrusion portion from above.

4. The gas stove according to claim 3.

Images