Gas stove

Abstract

To provide a gas cooking stove that is easy to ignite further securely even when fire power in the ignition is large.SOLUTION: In a gas cooking stove 1, an ignition part 100 comprises a guide groove 140, an ignition target 150 and a shade part 130. The guide groove 140 guides gas, having flowed in some of a plurality of flame carry-over flame hole grooves 33B, to radially outside a flange part 32. The ignition target 150 is provided at least in a part radially outside the guide groove 140 to form a discharge gap Z with a discharge plug 10. The shade part 130 extends radially outward from the guide groove 140 to cover a circumferential space of the ignition target 150 from above.SELECTED DRAWING: Figure 8

Description

[Technical field]

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

[0002] In the gas burner disclosed in Patent Document 1, the burner head is provided with an ignition protrusion protruding radially outward. The ignition protrusion is disposed opposite an igniter. In this gas burner, the gas ejected from the three flame retaining holes for the trivet claws corresponding to the flame transfer portion is ignited by discharging between the igniter and the ignition protrusion. [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] In the gas burner of Patent Document 1, when an electric discharge occurs between the ignition protrusion and the igniter, gas ejected from three flame retaining ports for trivet claws provided at the flame transfer section near the ignition protrusion is ignited, and the flame transfers from this flame transfer section in a clockwise and counterclockwise direction as viewed from the bottom. However, in such a gas stove, if the flame power at the time of ignition is large (for example, high flame power), the gas flow near the ignition protrusion (ignition target) becomes too fast, and there is a concern that the ignition performance cannot be sufficiently guaranteed.

[0005] An object of the present disclosure is to realize a gas stove that is easier to ignite reliably even when the flame power at the time of ignition is high. [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 discharge plug; having A gas stove, wherein the burner cap is provided with a plurality of flame hole grooves provided on an outer periphery of the flange portion, and an ignition portion that forms a discharge gap between the burner cap and the discharge plug, The plurality of burner hole grooves include A groove that forms a path for guiding the gas supplied from the burner body from the center side of the flange portion to the outside, and a plurality of main flame hole grooves that constitute main flame holes between the opposing surfaces of the burner body; A plurality of flame transfer flame hole grooves are provided between the two main flame hole grooves and constitute flame transfer flame holes between the opposing surfaces; Including, Two first flame hole grooves that are part of the plurality of main flame hole grooves are adjacent to both sides of the ignition portion in the circumferential direction of the flange portion, A second burner hole groove which is a part of the plurality of flame transfer burner hole grooves is disposed between two of the first burner hole grooves in the circumferential direction, The ignition unit includes: a guide groove that guides the gas that has flowed through the second burner hole groove to the radial outside of the flange portion; an ignition target, at least a portion of which is provided radially outward from the guide groove and which forms the discharge gap between the discharge plug and the ignition target; a cap portion that extends radially outward from the guide groove and covers a space around the ignition target from above; Equipped with The guide groove, the ignition target, and the cap portion are integrally formed and extend radially outward. Effect of the Invention

[0007] According to the technology disclosed herein, ignition can be more reliably achieved even when the flame power at the time of ignition is large. [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 schematic cross-sectional view of the gas burner of FIG. [Figure 4] FIG. 4 is an exploded perspective view showing a part of the gas burner of FIG. [Diagram 5] FIG. 5 is a perspective view of the burner cap body of the gas burner in FIG. 2 as viewed from below. [Figure 6] FIG. 6 is a bottom view of the burner cap body of FIG. [Figure 7] FIG. 7 is a schematic cross-sectional view showing a part of a cross section of the gas burner for a gas stove of the first embodiment taken along the central axis and the position of the ignition target (position AA in FIG. 6). [Figure 8] FIG. 8 is an enlarged perspective view showing the vicinity of the ignition portion in the burner cap body of FIG. 5, and is a perspective view showing the burner cap body turned upside down. [Figure 9] FIG. 9 is an enlarged view showing the vicinity of the ignition 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 [5] 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 discharge plug; having A gas stove, wherein the burner cap is provided with a plurality of flame hole grooves provided on an outer periphery of the flange portion, and an ignition portion that forms a discharge gap between the burner cap and the discharge plug, The plurality of burner hole grooves include A groove that forms a path for guiding the gas supplied from the burner body from the center side of the flange portion to the outside, and a plurality of main flame hole grooves that constitute main flame holes between the opposing surfaces of the burner body; A plurality of flame transfer flame hole grooves are provided between the two main flame hole grooves and constitute flame transfer flame holes between the opposing surfaces; Including, Two first flame hole grooves that are part of the plurality of main flame hole grooves are adjacent to both sides of the ignition portion in the circumferential direction of the flange portion, A second burner hole groove which is a part of the plurality of flame transfer burner hole grooves is disposed between two of the first burner hole grooves in the circumferential direction, The ignition unit includes: a guide groove that guides the gas that has flowed through the second burner hole groove to the radial outside of the flange portion; an ignition target, at least a portion of which is provided radially outward from the guide groove and which forms the discharge gap between the discharge plug and the ignition target; a cap portion that extends radially outward from the guide groove and covers a space around the ignition target from above; Equipped with A gas stove in which the guide groove, the ignition target, and the cap portion are integrally formed and extend radially outward.

[0011] In the gas stove described in [1], the gas supplied from the burner body to the second flame hole groove is supplied to the vicinity of the discharge gap through the guide groove. When a discharge occurs between the discharge plug and the ignition target while gas is supplied to the vicinity of the discharge gap in this manner, the gas near the discharge gap is ignited, and the flame is ignited so that it moves in the circumferential direction. Even if the flow rate of the gas flowing into the vicinity of the discharge gap through the guide groove is relatively high, the gas is received by the cap portion that covers the space around the ignition target from above, and the gas is easily decelerated, so that the flame is unlikely to be blown out immediately after ignition. Therefore, this gas stove makes it easier to perform ignition more reliably even if the firepower at the time of ignition is large.

[0012] [2] A gas stove as described in [1], wherein the underside of the cap has a curved surface, and the height of the curved surface becomes lower as it moves away from the ignition target.

[0013] The gas stove described in [2] has a curved underside of the stove head, and the curved surface is dome-shaped so that the position of the curved surface becomes lower as it moves away from the ignition target. This makes it easier for gas that flows into the vicinity of the ignition target to decelerate and accumulate. This makes it easier to ignite the stove more reliably.

[0014] [3] The radial length of the region of the guide groove and the ignition target is approximately the same as the radial length from the ignition target to the radial tip of the cap portion. A gas stove as described in [1] or [2].

[0015] If the radial length from the ignition target to the radial tip of the cap is too small, the effect of decelerating the gas is reduced, and if it is too large, it is easy to be burned by the flame from the main flame hole groove. As in the gas stove described in [3], if the radial length from the ignition target to the radial tip of the cap is approximately the same as the radial length of the guide groove and the ignition target area, it is possible to balance the effect of decelerating the gas and the effect of suppressing burning by the flame from the main flame hole groove.

[0016] [4] The second flame hole groove has a flame holding hole groove having an outlet portion provided below the guide groove, The outlet portion forms an outflow path along the radial direction, The inlet of the flame stabilizing hole groove forms an inflow path inclined with respect to the radial direction. A gas stove described in any one of [1] to [3].

[0017] In the gas stove described in [4], when gas is supplied to the guide groove through the flame stabilizing hole groove, the gas is made to flow in a direction inclined relative to the radial direction at the inlet of the flame stabilizing hole groove, and then the gas is made to flow in an outlet path along the radial direction at the outlet. Since the direction of the gas flow is forcibly changed in the flame stabilizing hole groove, the gas can also be decelerated in the flame stabilizing hole groove. Therefore, the effect of decelerating the gas in the flame stabilizing hole groove and the effect of decelerating the gas near the cap portion have a synergistic effect, and the ignition performance can be significantly improved.

[0018] [5] The flange portion has an outer circumferential surface on which ends of the plurality of main flame hole grooves are provided, the ignition portion has a thick portion that is connected between the two first flame hole grooves on the outer peripheral surface and extends radially outward from the outer peripheral surface, and a thin portion that is thinner than the thick portion and extends radially outward from the thick portion, The ignition target and the guide groove are provided in the thick-walled portion, The cap portion is provided in the thin portion, The lower surface of the cap portion is provided above the lower end of the ignition target. A gas stove described in any one of [1] to [4].

[0019] The gas stove described in [5] has a thick portion at the base of the ignition part to make it strong, while the relatively thick portion can ignite more reliably. Furthermore, a thin portion is arranged radially outside the thick portion, and the hood is provided in that portion, making it easier and more compact to realize a "configuration in which the hood is provided radially outside the ignition target and the lower surface of the hood is provided above the lower end of the ignition target." Moreover, because the "configuration in which the lower surface of the hood is provided above the lower end of the ignition target" makes it easier for the lower surface of the hood to receive gas moving radially outward, and the gas tends to stagnate near the hood.

[0020] First Embodiment In the following, a gas stove 1 equipped with gas burners 4, 5, 6 for a gas stove of a first embodiment will be described.

[0021] 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.

[0022] 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 long side 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 2. Overview of gas burners The configuration and operation of the gas burner 6 will be mainly described in detail below. 2 and 3, the gas burner 6 includes a burner body 6A and a burner cap 20 attached to the burner body 6A. 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.

[0029] The burner body 6A shown in FIG. 2 and FIG. 3 is a component for supplying combustion gas. The burner body 6A mainly includes a cylindrical lower-positioned portion 6B and a throat portion 6C connected to the lower-positioned portion 6B. The lower-positioned portion 6B is a portion facing the burner cap 20 from the lower side. The lower-positioned portion 6B is a portion 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 portion 6B receives and supports, for example, the flange portion 32 of the burner cap body 30. The throat portion 6C is a cylindrical portion that extends from the lower-positioned portion 6B, and is a portion that forms a pipe that flows gas. The throat portion 6C functions as a mixing pipe that mixes fuel gas and combustion air. The mixed gas chamber 6Z shown in FIG. 3 communicates with the inside of the throat portion 6C (FIG. 2). The mixture chamber 6Z constitutes a space in which the fuel gas and the combustion air supplied through the throat portion 6C are mixed.

[0030] The burner cap 20 shown in FIG. 2 and FIG. 3 functions as a burner head. 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 flame hole groove 33 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, a discharge plug 10 for ignition and a thermocouple (not shown) for flame detection are provided near any one of the flame hole grooves 33. In FIG. 2, FIG. 4, etc., only the symbols of some of the flame hole grooves 33 are shown, but a large number of the flame hole grooves 33 are formed over the entire circumferential direction of the burner cap body 30.

[0031] As shown in Figures 2 and 3, a 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 contact the bottom of a cooking utensil (such as a cooking pot) placed on the trivet 7 and detect the temperature of the bottom of the cooking utensil. In Figure 3, components other than the temperature sensor 9 are shown in cross section, and the temperature sensor 9 is shown in a schematic configuration as viewed from the side. Figure 3 is a schematic diagram showing a cross section cut along a cutting plane passing through the main flame hole groove 33A and the central axis G.

[0032] 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 Fig. 2 and Fig. 3 together with primary air, and the mixture flows out from the many flame hole grooves 33 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 discharge plug 10 adjacent to the burner cap 20 shown in Fig. 2 and Fig. 3 to ignite the mixture, and a flame is generated around the burner cap 20. This allows the bottom of the cooking utensil placed on the trivet 7 around the burner cap 20 to be heated, making it possible to cook.

[0033] 3. Burner body The burner body 6A is configured by integrally connecting a lower portion 6B and a throat portion 6C. 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 70.

[0034] As shown in FIG. 4, 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 facing surface 66A is an annular surface facing the flange portion 32 (annular portion) of the burner cap 20. The facing surface 66A is arranged facing each burner hole groove 33. 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 is positioned lower toward the inside (the inner peripheral wall portion 62 side), and is configured in a mortar shape overall. The diameter (diameter) of the facing surface 66A centered on the central axis G becomes smaller as it is positioned lower. It is desirable for the facing surface 66A to function as a support surface that supports the flange portion 32 of the burner cap body 30 from the lower side.

[0035] A lower connecting portion 70 is provided below the cylindrical portion 60 and connected to the cylindrical portion 60. The lower connecting portion 70 includes an annular outer wall portion 72 connected to the inner circumferential wall portion 62, a bottom wall portion 78 connected to the lower end of the outer wall portion 72, and a cylindrical support tube 76 rising upward from the bottom wall portion 78. The upper end of the outer wall portion 72 is connected to the lower end of the inner circumferential wall portion 62, and the outer wall portion 72 and the inner circumferential wall portion 62 form an inner wall portion (annular wall portion) on the outside 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 72 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 cylindrical portion 31 of the burner cap body 30 is inserted into the support cylinder 76 from above. The cylindrical portion 31 and the support cylinder 76 form an inner wall portion (annular wall portion) on the inside of the mixed gas chamber 6Z. The outer wall portion 72 is integrally formed with the throat portion 6C. The internal space of the outer wall portion 72 (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.

[0036] 4. Burner cap The following description relates to the detailed construction of the burner cap 20. As shown in Figures 2, 3, and 4, 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 fixed to the burner cap body 30, and the burner cap body 30 is located below the cover body 40. 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 portion 31 and a flange portion 32 extending from the upper end side of the cylindrical portion 31.

[0037] As shown in FIG. 3, the cylindrical portion 31 is configured in a cylindrical shape so that a predetermined central axis G is the center of the cylinder, and extends along the central axis G. The direction of the central axis G is, for example, the vertical direction. The inner peripheral surface of the cylindrical portion 31 is configured as a cylindrical surface centered on the central axis G or an annular surface along the cylindrical surface centered on the central axis G. The outer peripheral surface of the cylindrical portion 31 is also configured as a cylindrical surface centered on the central axis G or an annular surface along the cylindrical surface centered on the central axis G. The upper end of the cylindrical portion 31 forms an opening of the upper end of the burner cap 20. The lower end of the cylindrical portion 31 forms an opening of 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 inside of the through hole 36 is configured to allow gas to pass in the vertical direction. The inner peripheral portion of the cylindrical portion 31 forms the through hole 36 and functions as a hole portion continuing from the upper end to the lower end of the burner cap 20.

[0038] As shown in FIG. 3, the flange portion 32 is configured as a portion that protrudes outward in the radial direction centered on the central axis G from a portion near the upper end of the cylindrical portion 31. 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 cylindrical portion 31, and is configured as a portion that protrudes 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 cylindrical 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 protrusion portion 43 of the cover body 40 contacts 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 33 are provided on a lower surface portion 35 of the flange portion 32. In the state where the burner cap 20 is attached to the burner body 6A as shown in Fig. 3, the lower surface 35 of the flange portion 32 is disposed opposite the opposing surface 66A of the burner body 6A. In the attached state shown in Fig. 3, it is desirable that the lower surface 35 of the flange portion 32 is placed so as to come into contact with the opposing surface 66A.

[0039] As shown in Figs. 3 and 4, 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 Figs. 2 to 4, 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.

[0040] As shown in Figs. 3 and 4, 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.

[0041] As shown in FIG. 3 and FIG. 4, 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 part 31. The first protrusion 42 is fixed to the tubular part 31 while contacting the inner periphery 39 of the tubular part 31. Specifically, a recess 50 is provided in the inner periphery 39 of the tubular part 31, and a hook part 47 forming a part of the first protrusion 42 is hooked on the recess 50 while entering the recess 50, so that the first protrusion 42 does not come off from the tubular part 31. With this configuration, the cover body 40 is fixed to the burner cap main body 30.

[0042] 5. Structure around the ignition part As shown in Figures 4 and 5, the burner cap 20 has a plurality of flame hole grooves 33 provided on the outer periphery of the flange portion 32, and an ignition portion 100 that forms a discharge gap Z between itself and the discharge plug 10 (Figures 1 and 7).

[0043] As shown in Figs. 6 and 7, the ignition unit 100 is provided so as to extend radially outward from the cylindrical outer peripheral surface 32A of the flange portion 32, which is configured in a plate-like and disc-like shape. The cylindrical outer peripheral surface 32A of the flange portion 32 is a curved surface on which the ends of the flame hole grooves 33, such as the ends of the main flame hole grooves 33A and the ends of the flame transfer flame hole grooves 33B, are provided. Specifically, the outer peripheral surface 32A is a surface along a cylindrical surface (a surface having a predetermined distance from the central axis G) centered on the central axis G. The ignition unit 100 is configured as a protrusion protruding from the outer peripheral surface 32A along the above-mentioned radial direction. In this specification, the radial direction is a direction parallel to the "direction passing through the central axis G and perpendicular to the central axis G" and is the radial direction of a cylinder centered on the central axis G. In Fig. 9, the direction passing through the tip of the ignition target 150 in the radial direction is indicated by a straight line L1.

[0044] Among the flame hole grooves 33, the main flame hole groove 33A 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, and is a groove that constitutes the main flame hole 110 between the opposing surface 66A of the burner body 6A as shown in Fig. 2. In the example of Figs. 8 and 9, among the multiple main flame hole grooves 33A provided on one circumferential side of the ignition part 100, the groove closest to the ignition part 100 is one main flame hole groove 33X. And, among the multiple main flame hole grooves 33A provided on the other circumferential side of the ignition part 100, the groove closest to the ignition part 100 is the other main flame hole groove 33Y.

[0045] Among the flame hole grooves 33, the flame transfer flame hole groove 33B is provided between the two main flame hole grooves 33A, and is a groove that constitutes the flame transfer flame hole 124 between the opposing surface 66A. In the example of FIG. 8, among the multiple flame transfer flame hole grooves 33B, the inner flame hole grooves 160, 171, 172 are provided between one main flame hole groove 33X and the other main flame hole groove 33Y. The inner flame hole grooves 160, 171, 172 are flame hole grooves provided on the radial inside of the ignition part 100 among the multiple flame transfer flame hole grooves 33B. One main flame hole groove 33X and the other main flame hole groove 33Y correspond to an example of two first flame hole grooves. The inner flame hole groove 160, which is a part of the multiple flame transfer flame hole grooves 33B, corresponds to an example of a "second flame hole groove" and is arranged between the two main flame hole grooves 33X and 33Y (two first flame hole grooves) in the circumferential direction. Each outlet, which is the radially outer end of the inner flame hole grooves 160, 171, 172, is disposed between the two main flame hole grooves 33X, 33Y (two first flame hole grooves).

[0046] As shown in FIG. 8, the ignition unit 100 includes a thick portion 101 and a thin portion 102. The thin portion 102 is thinner than the thick portion 101. The thick portion 101 is connected between the two main flame hole grooves 33X, 33Y (two first flame hole grooves) on the outer circumferential surface 32A and extends radially outward from the outer circumferential surface 32A. The thin portion 102 is thinner than the thick portion 101 and extends radially outward from the thick portion 101. The ignition unit 100 has a guide groove 140, an ignition target 150, and a cap portion 130. The guide groove 140 and the ignition target 150 are provided in the thick portion 101. The cap portion 130 is provided in the thin portion 102. In the burner cap body 30, the guide groove 140, the ignition target 150, and the cap portion 130 are integrally constructed (more specifically, integrally molded) from the same material.

[0047] 8, the guide groove 140 is a groove that guides gas that has flowed through the inner flame hole groove 160 of the multiple flame transfer flame hole grooves 33B radially outward. The guide groove 140 is provided radially outward of the outlet portion 161 of the inner flame hole groove 160. The guide groove 140 is provided at a position above the outlet portion 161. A radially inner end of the guide groove 140 is connected to the outer circumferential surface 32A of the flange portion 32. A radially outer end of the guide groove 140 is open to the ignition target 150 side.

[0048] The inner flame hole groove 160 is a flame stabilizing hole groove. The inlet portions 163 and 164 of the inner flame hole groove 160 (flame stabilizing hole groove) form an inflow path inclined with respect to the radial direction. Specifically, a flow path 166 in a certain range from the inlet portion 163 is a linear flow path inclined with respect to the radial direction. A flow path 167 in a certain range from the inlet portion 164 is a linear flow path inclined with respect to the radial direction. An end portion of the flow path 166 opposite to the inlet portion 163 and an end portion of the flow path 167 opposite to the inlet portion 164 are connected to each other. The gas flowing in through the flow path 166 and the gas flowing in through the flow path 167 are both configured to flow into a common flow path 168, and the radially outer end portion of the common flow path 168 is configured as an outlet portion 161. The outlet portion 161 is provided below and radially inward of the guide groove 140. The outlet portion 161 constitutes an outflow path along the radial direction, and functions to make the gas supplied through the burner body 6A flow radially outward.

[0049] As shown in FIG. 8, at least a part of the ignition target 150 is provided radially outward from the guide groove 140, and forms a discharge gap Z (FIG. 7) between the ignition target 150 and the discharge plug 10. In the example of FIG. 8, the entire ignition target 150 is disposed radially outward from the guide groove 140. The ignition target 150 is configured as a protruding part that protrudes radially outward from the radially outer end of the guide groove 140 and protrudes downward (upward in the drawing of FIG. 8) from the lower surface of the cap part 130. The radially outer end of the ignition target 150 is disposed facing the discharge plug 10 (FIGS. 1 and 7) vertically, and a spark discharge is generated between them. The lower end 150A of the ignition target 150 is the lowest part of the ignition target 150 configured as the protruding part.

[0050] As shown in Figs. 8 and 9, the cap portion 130 extends radially outward from the guide groove 140 and covers the space around the ignition target 150 from above. At least a portion (preferably a majority region) of the lower surface of the cap portion 130 is provided above the lower end 150A. In the example of Figs. 8 and 9, the entire lower surface of the cap portion 130 is provided above the lower end 150A. The lower surface of the cap portion 130 has a curved surface 130A, and the height (vertical position) of the curved surface 130A becomes lower as it moves away from the ignition target 150. The ignition target 150 protrudes downward from the surface on the upper end side of the curved surface 130A, and a part of the ignition target 150 is inside the cap portion 130. The uppermost part of the curved surface 130A is provided radially outward from the ignition target 150. This uppermost portion is disposed on the curved surface 130A at a position closer to the radially inner end, and is disposed on the curved surface 130A closer to the ignition target 150 in the radial direction. The curved surface 130A is positioned lower as it moves radially outward from the uppermost portion. The curved surface 130A is also positioned lower as it moves away from the uppermost portion in the lateral direction (direction perpendicular to the direction of L1 and perpendicular to the up-down direction). Furthermore, as shown in FIG. 9, the radial length X1 of the region of the guide groove 140 and the ignition target 150 is approximately the same as the radial length X2 from the ignition target 150 to the radial tip 132 of the cap portion 130.

[0051] 6. Example of effects In the gas stove 1, the gas supplied from the burner body 6A to the inner flame hole groove 160 (second flame hole groove) is supplied to the vicinity of the discharge gap Z (FIG. 7) through the guide groove 140. When a discharge occurs between the discharge plug 10 and the ignition target 150 in a state in which the gas is supplied to the vicinity of the discharge gap Z (FIG. 7) in this way, the gas near the discharge gap Z (FIG. 7) is ignited, and the flame is ignited so that it moves in the circumferential direction. Even if the flow speed of the gas flowing through the guide groove 140 to the vicinity of the discharge gap Z (FIG. 7) is relatively high, the gas is received by the cap portion 130 that covers the space around the ignition target 150 from above, and the gas is likely to be decelerated, so that the flame is unlikely to be blown out immediately after ignition. Therefore, in this gas stove 1, ignition is more likely to be performed reliably even if the firepower at the time of ignition is large.

[0052] Since the curved surface 130A of the cap portion 130 is dome-shaped and becomes lower as it moves away from the ignition target 150, the gas that flows into the vicinity of the ignition target 150 is more likely to be decelerated and more likely to remain there. Therefore, the gas stove 1 makes ignition easier and more reliable.

[0053] If the radial length X2 from the ignition target 150 to the radial tip 132 of the cap portion 130 is too small, the effect of slowing down the gas is reduced, and if it is too large, it becomes easier to be scorched by the flame from the main flame hole groove 33A. As in gas stove 1, if the radial length X2 from the ignition target 150 to the radial tip 132 of the cap portion 130 is approximately the same as the radial length X1 of the area of ​​the guide groove 140 and the ignition target 150, a balance can be achieved between the "effect of slowing down the gas" and the "effect of suppressing scorching by the flame from the main flame hole groove 33A."

[0054] When gas is supplied to the guide groove 140 through the inner flame hole groove 160 (flame holding hole groove), the gas flows in a direction inclined relative to the radial direction at the inlet portions 163 and 164 of the inner flame hole groove 160 (flame holding hole groove), and then the gas flows through an outlet path along the radial direction at the outlet portion 161. Since the inner flame hole groove 160 (flame holding hole groove) is configured to forcibly change the direction of gas flow, the gas can also be decelerated in the inner flame hole groove 160 (flame holding hole groove). Therefore, the effect of decelerating the gas in the inner flame hole groove 160 (flame holding hole groove) and the effect of decelerating the gas near the hood portion 130 have a synergistic effect, and the ignition performance can be significantly improved.

[0055] The gas stove 1 is constructed to be strong by providing the thick portion 101 at the base of the ignition portion 100, while the relatively thick portion can perform ignition more reliably. Furthermore, the thin portion 102 is disposed radially outside the thick portion 101, and the hood portion 130 is provided at that portion, so that the "configuration in which the hood portion is provided radially outside the ignition target and the lower surface of the hood portion is provided above the lower end of the ignition target" can be realized more simply and compactly. Moreover, because the "configuration in which the lower surface of the hood portion 130 is provided above the lower end 150A of the ignition target 150", the gas moving radially outward is easily received by the lower surface of the hood portion 130, and the gas is easily retained near the hood portion 130.

[0056] In the example of FIG. 7 and FIG. 8, the cap portion 130 is offset so as to extend slightly above the main flame hole grooves 33X, 33Y (two first flame hole grooves). The curved surface 130A is disposed at a position higher than the upper end portions of the main flame hole grooves 33X, 33Y (upper wall portions of each of the main flame hole grooves 33X, 33Y) on the radially outer side of the main flame hole grooves 33X, 33Y. Specifically, the entire curved surface 130A is disposed at a position higher than the upper end portions of the main flame hole grooves 33X, 33Y on the radially outer side of the main flame hole grooves 33X, 33Y. More specifically, the entire cap portion 130 is disposed at a position higher than the upper end portions of each of the main flame hole grooves 33X, 33Y on the radially outer side of the main flame hole grooves 33X, 33Y. Because of this configuration, the gas discharged upward from the two main flame hole grooves 33X, 33Y is likely to be received by the shade portion 130, and the gas is likely to remain in the vicinity of the shade portion 130.

[0057] <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.

[0058] 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.

[0059] 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]

[0060] 1: Gas stove 4: Gas burner 5: Gas burner 6: Gas burner 6A: Burner body 10: Discharge plug 20: Burner cap 21: Burner cap 22: Burner cap 30: Burner cap body 31: Cylindrical part 32: Flange part 32A: Outer surface 33: Flame hole groove 33A: Main flame hole groove 33B: Fire hole groove 33X: Main flame hole groove (1st flame hole groove) 33Y: Main flame hole groove (1st flame hole groove) 100: Ignition part 110: Main flame hole 124: Fire-transfer hole 130: Kasabe 130A: Curved surface 132: Radial tip 140: Guide groove 150: Ignition target 160: Inner flame hole groove (second flame hole groove) 161:Exit part 163: Entrance 164: Entrance Z: Discharge gap

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 discharge plug; having A gas stove, wherein the burner cap is provided with a plurality of flame hole grooves provided on an outer periphery of the flange portion, and an ignition portion that forms a discharge gap between the burner cap and the discharge plug, The plurality of burner hole grooves include A groove that forms a path for guiding the gas supplied from the burner body from the center side of the flange portion to the outside, and a plurality of main flame hole grooves that constitute main flame holes between the opposing surfaces of the burner body; A plurality of flame transfer flame hole grooves are provided between the two main flame hole grooves and constitute flame transfer flame holes between the opposing surfaces; Including, Two first flame hole grooves that are part of the plurality of main flame hole grooves are adjacent to both sides of the ignition portion in a circumferential direction of the flange portion, a second flame hole groove which is a part of the plurality of flame transfer flame hole grooves is disposed between two of the first flame hole grooves in the circumferential direction, one of the two first flame hole grooves is a groove which is closest to the ignition portion among the plurality of main flame hole grooves provided on one circumferential side of the ignition portion, and the other of the two first flame hole grooves is a groove which is closest to the ignition portion among the plurality of main flame hole grooves provided on the other circumferential side of the ignition portion, the second burner hole groove is spaced apart from each of the two first burner hole grooves in the circumferential direction, an outlet portion of the second burner hole groove forms an outflow path along a radial direction of the flange portion, The ignition unit includes: a guide groove disposed radially outward of the outlet portion and configured to guide gas that has flowed through the second burner hole groove to the radially outward direction; an ignition target, at least a portion of which is provided radially outward from the guide groove and which forms the discharge gap between the discharge plug and the ignition target; a cap portion that extends radially outward from the guide groove and covers a space around the ignition target from above; Equipped with The guide groove, the ignition target, and the cap portion are integrally formed and extend radially outward, The width of the guide groove is larger than the width of the outlet portion of the second burner hole groove, The lower end of the guide groove is located above the upper end of the outlet portion. Gas stove.

2. 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 discharge plug; having A gas stove, wherein the burner cap is provided with a plurality of flame hole grooves provided on an outer periphery of the flange portion, and an ignition portion that forms a discharge gap between the burner cap and the discharge plug, The plurality of burner hole grooves include A groove that forms a path for guiding the gas supplied from the burner body from the center side of the flange portion to the outside, and a plurality of main flame hole grooves that constitute main flame holes between the opposing surfaces of the burner body; A plurality of flame transfer flame hole grooves are provided between the two main flame hole grooves and constitute flame transfer flame holes between the opposing surfaces; Including, Two first flame hole grooves that are part of the plurality of main flame hole grooves are adjacent to both sides of the ignition portion in a circumferential direction of the flange portion, A second burner hole groove which is a part of the plurality of flame transfer burner hole grooves is disposed between two of the first burner hole grooves in the circumferential direction, The ignition unit includes: a guide groove that guides the gas that has flowed through the second burner hole groove to the radially outer side of the flange portion; an ignition target, at least a portion of which is provided radially outward from the guide groove and which forms the discharge gap between the discharge plug and the ignition target; a cap portion that extends radially outward from the guide groove and covers a space around the ignition target from above; Equipped with The guide groove, the ignition target, and the cap portion are integrally formed and extend radially outward, The second flame hole groove has an outlet portion provided below and radially inward from the guide groove and includes a flame holding hole groove having two inlet portions, The outlet portion forms an outflow path along the radial direction, The flame stabilizing hole groove has a first flow passage which is a flow passage in a certain range from one of the inlets and is inclined with respect to the radial direction, a second flow passage which is a flow passage in a certain range from the other inlet, is inclined with respect to the radial direction, and is inclined in a direction different from the direction of the first flow passage, and a common flow passage, an end portion of the first flow path that is disposed on the opposite side to one of the inlets and disposed radially outward from one of the inlets, and an end portion of the second flow path that is disposed on the opposite side to the other inlet and disposed radially outward from the other inlet are in communication with each other, so that both the gas flowing in through the first flow path and the gas flowing in through the second flow path flow into the common flow path, The radially outer end of the common flow passage is configured as the outlet portion. Gas stove.

3. The lower surface of the cap portion has a curved surface, The height of the curved surface decreases with increasing distance from the ignition target. A gas stove according to claim 1 or 2.

4. The radial length of the region of the guide groove and the ignition target and the radial length from the ignition target to the radial tip of the cap portion are approximately the same. A gas stove according to any one of claims 1 to 3.

5. the flange portion has an outer circumferential surface on which ends of the plurality of main flame hole grooves are provided, the ignition portion has a thick portion that is connected between the two first flame hole grooves on the outer peripheral surface and extends radially outward from the outer peripheral surface, and a thin portion that is thinner than the thick portion and extends radially outward from the thick portion, The ignition target and the guide groove are provided in the thick-walled portion, The cap portion is provided in the thin portion, The lower surface of the cap portion is provided above the lower end of the ignition target. A gas stove according to any one of claims 1 to 4.

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