Gas burners for gas stoves and gas stoves

Abstract

To provide a technique that enables a flame generated from a flame holding hole to more easily stay in the vicinity of the flame holding hole and further exhibits a flame holding performance.SOLUTION: A main flame hole groove 33A constitutes a main flame hole 110 between itself and an opposite face 66A, in a gas burner 6 for a gas cooker. A flame holding hole groove 33C constitutes a flame holding hole 120 between itself and the opposite face 66A. An upper end 111 of an inner wall of the main flame hole groove 33A forms an upward slope getting higher as it approaches an outer circumferential face 32A of a flange 32 (an annular part). A vertical gap between an upper end 121 of an inner wall of the flame holding hole groove 33C and the opposite face 66A becomes smaller as it approaches the outer circumferential face 32A of the flange 32.SELECTED DRAWING: Figure 7

Description

[Technical field]

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

[0002] Conventional gas burners, including the technology of Patent Document 1, are equipped with a main flame hole and a flame stabilizing hole (flame stabilizing port) with an opening area smaller than that of the main flame hole, and the flame (main flame) ejected from the main flame hole (main flame port) is stabilized from below by the flame from the flame stabilizing hole, suppressing lift of the main flame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-204435 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the flame from this type of main flame hole tries to extend outward, the flame from the flame stabilizing hole is pulled by the main flame, and there is a concern that the flame stabilizing performance cannot be fully exhibited. For example, in the gas burner disclosed in Patent Document 1, as shown in FIG. 3 of Patent Document 1, the upper wall 13b of the auxiliary flame hole 13 and the mounting surface 14d are parallel, so that the gas flowing through the auxiliary flame hole 13 tends to flow outward along the direction of the upper wall 13b and the mounting surface 14d, and as a result, there is a concern that the effect of retaining the flame near the auxiliary flame hole 13 is insufficient. With such a configuration, when the flame tries to extend outward from the main flame holes 12 provided on both sides of the auxiliary flame hole 13, the flame near the auxiliary flame hole 13 is also likely to extend outward due to being pulled by this flame, and there is a concern that the effect of suppressing the lift of the main flame cannot be fully exhibited.

[0005] The present disclosure provides a technology that makes it easier for the flame generated from the flame stabilizing hole to remain in the vicinity of the flame stabilizing hole, thereby making it easier to exhibit flame stabilizing performance. [Means for solving the problem]

[0006] The present disclosure relates to a gas burner for a gas stove, A gas burner comprising a burner body for supplying gas and a burner cap attached to the burner body, The burner cap has an annular portion having a plurality of burner hole grooves on a lower surface thereof, The burner body includes an upper surface portion having an annular opposing surface facing the annular portion, The burner hole groove is a main flame hole groove that is provided in a circumferential direction on the lower surface portion and forms a path for guiding the gas supplied from the burner body from the center side of the annular portion to the outside, and that constitutes a main flame hole between the opposing surface; a groove provided between two adjacent main flame hole grooves in the lower surface portion, forming a path for guiding gas supplied from the burner body, the groove having a vertical depth smaller than that of the main flame hole groove, and a flame stabilizing hole groove forming a flame stabilizing hole between the opposing surface; having an upper end portion of an inner wall of the main flame hole groove has an upward inclination shape that becomes higher as it approaches an outer circumferential surface of the annular portion; The vertical distance between the upper end of the inner wall of the flame stabilizing hole groove and the opposing surface becomes smaller toward the outer circumferential surface of the annular portion. Effect of the Invention

[0007] According to the technology of the present disclosure, the flame generated from the flame stabilizing hole can be more easily retained in the vicinity of the flame stabilizing hole, making it easier to exhibit flame stabilizing performance. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view that illustrates a schematic example of a gas stove equipped with a gas burner for a gas stove according to the first embodiment. [Diagram 2] FIG. 2 is a perspective view illustrating the gas burner for a gas stove according to 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 cross section of the gas burner for a gas stove according to the first embodiment cut at the position of the flame stabilizing hole groove (position AA in FIG. 6). [Figure 8] FIG. 8 is an enlarged view showing the vicinity of the flame stabilizing hole groove in the cross section of FIG. [Figure 9] FIG. 9 is an enlarged view showing the vicinity of the main burner groove in the cross section of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The following describes exemplary embodiments of the present disclosure. The following exemplary features [1] to [3] may be combined in any compatible combination.

[0010] [1] A gas burner comprising a burner body for supplying gas and a burner cap attached to the burner body, The burner cap has an annular portion having a plurality of burner hole grooves on a lower surface thereof, The burner body includes an upper surface portion having an annular opposing surface facing the annular portion, The burner hole groove is a main flame hole groove that is provided in a circumferential direction on the lower surface portion and forms a path for guiding the gas supplied from the burner body from the center side of the annular portion to the outside, and that constitutes a main flame hole between the opposing surface; a groove provided between two adjacent main flame hole grooves in the lower surface portion, forming a path for guiding gas supplied from the burner body, the groove having a vertical depth smaller than that of the main flame hole groove, and a flame stabilizing hole groove forming a flame stabilizing hole between the opposing surface; having an upper end portion of an inner wall of the main flame hole groove has an upward inclination shape that becomes higher as it approaches an outer circumferential surface of the annular portion; The vertical distance between the upper end of the inner wall of the flame stabilizing hole groove and the opposing surface becomes smaller toward the outer circumferential surface of the annular portion. Gas burner for gas stove.

[0011] In the gas burner for a gas stove described in [1], the upper wall (upper end of the inner wall of the flame stabilizing hole groove) and the lower wall (opposing surface) of the flame stabilizing hole are oriented in different directions, and the vertical distance between them becomes smaller as they approach the outer circumferential surface of the annular portion, so that the gas flowing out through the flame stabilizing hole can be prevented from flowing largely only in the direction along the upper wall (upper end of the inner wall of the flame stabilizing hole groove) or only in the direction along the lower wall (opposing surface), and the flow rate of the gas discharged from the flame stabilizing hole can be easily suppressed. Furthermore, this gas burner can make the direction of most of the gas flowing out through the flame stabilizing hole different from the direction of the gas flowing out through the main flame hole. Therefore, in this gas burner, the flow velocity suppression effect and the effect of changing the direction exert a synergistic effect, the gas discharged from the flame stabilizing hole is easily retained near the outlet of the flame stabilizing hole, and even when the main flame generated from the main flame hole tries to extend outward, the flame stabilizing hole is prevented from being dragged by the main flame and extending too far outward. Therefore, this gas burner is easy to stably maintain the flame near the flame stabilizing hole, and is easy to more fully exhibit the flame stabilizing performance.

[0012] [2] The opposing surface is an inclined surface that becomes higher as it approaches the outer circumferential edge of the upper surface portion, and the upper end portion of the inner wall of the flame stabilizing hole groove extends along the horizontal direction or has a downward inclination that becomes lower as it approaches the outer circumferential surface of the annular portion. A gas burner for a gas stove described in [1].

[0013] The gas burner for a gas stove described in [2] is easy to prevent the flame from extending upward due to the presence of the upper end of the inner wall that extends horizontally or has a downward sloping shape. Therefore, this gas burner can further prevent the flame from extending upward due to the influence of the main flame, even if the main flame tries to extend upward.

[0014] [3] A gas stove having a gas burner for a gas stove described in [1] or [2].

[0015] The gas stove described in [3] can realize a gas stove that produces the same effect as the above gas burner.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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, an ignition electrode 10 and a thermocouple (not shown) for flame detection are provided near any 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 flame hole grooves 33 are formed over the entire circumferential direction of the burner cap body 30.

[0027] 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.

[0028] 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 numerous 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 electrode 10 adjacent to the burner cap 20 shown in Fig. 2 and Fig. 3 to ignite the mixture, and generates a flame 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.

[0029] 3. Details of the 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.

[0030] 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.

[0031] 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 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 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.

[0032] 4. Burner cap details 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 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.

[0033] 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 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 .

[0034] As shown in FIG. 3, the flange portion 32 is configured as a portion that protrudes radially outward from a portion near the upper end of the tubular portion 31 around the central axis G. 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 protrudes radially outward from the portion on the upper end side around the central axis G. The flange portion 32 and the tubular portion 31 are integrally configured, for example, from 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.

[0035] 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.

[0036] 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.

[0037] 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 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 configured to enter the recess 50 and hook 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.

[0038] 5. Details about the burner groove 5 and 6, in the burner cap body 30, a large number of the above-mentioned flame hole grooves 33 are intermittently formed over the entire circumferential direction on the underside 35 of the flange portion 32. The multiple flame hole grooves 33 include main flame hole grooves 33A, flame transfer hole grooves 33B, and flame retention hole grooves 33C.

[0039] The main flame hole groove 33A is a hole that generates a relatively large flame, and is a groove for forming a flame hole that generates a main flame that contributes greatly to heating. A plurality of main flame hole grooves 33A are provided in the circumferential direction on the lower surface 35 of the flange portion 32. Each 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. As shown in Figures 2 and 3, each main flame hole groove 33A faces the opposing surface 66A of the burner body 6A and forms a main flame hole 110 together with the opposing surface 66A. The main flame hole groove 33A has an upper end portion 111 that forms the upper end of the groove, and a pair of wall portions that are arranged on both sides of the flange portion 32 in the circumferential direction with respect to the upper end portion 111, and the pair of wall portions have wall surfaces along the up-down direction. Both wall surfaces of the pair of wall portions face each other in the circumferential direction. The lower ends of the pair of walls in the main flame hole groove 33A are inclined to follow the opposing surface 66A. The lower ends of the pair of walls in the main flame hole groove 33A may be in contact with the opposing surface 66A or may be slightly separated from it. The opposing surface 66A may be a support surface on which the flange portion 32 is placed. The lower ends of the pair of walls in the main flame hole groove 33A are also used as the lower ends of the pair of walls in the flame retention hole groove 33C.

[0040] The flame stabilizing hole groove 33C is provided between two adjacent main flame hole grooves 33A on the lower surface portion 35 of the flange portion 32. The flame stabilizing hole groove 33C is a groove that forms a path for guiding gas supplied from the burner body 6A. As shown in Figs. 2, 7, and 8, the flame stabilizing hole groove 33C faces the opposing surface 66A and forms a flame stabilizing hole 120 together with the opposing surface 66A. The flame stabilizing hole groove 33C is a groove that is smaller in size than the main flame hole groove 33A. Specifically, the flame stabilizing hole groove 33C has a smaller vertical groove depth than the main flame hole groove 33A.

[0041] The flame transfer hole groove 33B is smaller than the main flame hole groove 33A. The flame transfer hole groove 33B faces the opposing surface 66A and forms a flame transfer hole 130 (FIG. 2) together with the opposing surface 66A. The flame transfer hole 130 is a hole that has the function of transferring a flame generated in the main flame hole groove 33A on one circumferential side of itself across itself to the main flame hole groove 33A on the opposite side, thereby continuing the flame.

[0042] 3, in the gas burner 6, the upper end 111 of the inner wall of the main flame hole groove 33A is inclined upwardly toward the outer circumferential surface 32A of the flange portion 32 (annular portion). In the configuration of FIG. 3, the vertical distance between the upper end 111 of the inner wall of the main flame hole groove 33A and the opposing surface 66A becomes larger toward the outer circumferential surface 32A of the flange portion 32.

[0043] In the gas burner 6, the flame stabilizing hole groove 33C has an upper end 121 constituting the upper end of the groove, and a pair of wall portions arranged on both sides of the flange portion 32 in the circumferential direction with respect to the upper end 121, and the pair of wall portions have wall surfaces along the up-down direction. The wall surfaces of the pair of wall portions face each other in the circumferential direction. The lower ends of the pair of wall portions in the flame stabilizing hole groove 33C are inclined so as to follow the opposing surface 66A. The lower ends of the pair of wall portions in the flame stabilizing hole groove 33C may be in contact with the opposing surface 66A, or may be slightly separated from it.

[0044] The vertical distance between the upper end 121 of the inner wall of the flame stabilizing hole groove 33C and the opposing surface 66A becomes smaller as it approaches the outer peripheral surface 32A of the flange portion 32. In the examples of Figs. 4, 7, and 8, the opposing surface 66A is an inclined surface that becomes higher as it approaches the outer peripheral edge of the upper surface portion 66. Specifically, in a cut surface (cut surface as in Fig. 7) passing through the central axis G and the position of the upper end 121, the upper end 121 of the inner wall of the flame stabilizing hole groove 33C extends along the horizontal direction, or has a downward inclination that becomes lower as it approaches the outer peripheral surface 32A of the flange portion 32, and in this cut surface, the opposing surface 66A is inclined to become higher as it approaches the outer peripheral edge of the upper surface portion 66. In the examples of Figs. 7 and 8, the upper end 121 of the inner wall of the flame stabilizing hole groove 33C extends in the second reference direction, and specifically, the upper end 121 has a form that extends along the horizontal direction. The angle θ2 is an angle between the direction in which the upper end 121 of the inner wall of the flame stabilizing hole groove 33C extends (second reference direction) and the horizontal direction. FIG. 8 is an enlarged view of a cross section cut along a cutting plane passing through the central axis G and the upper end 121 of one of the flame stabilizing hole grooves 33C, and an extension line of the straight line showing the upper end 121 in the cross section of FIG. 8 is Ly. The horizontal line La2 is a horizontal line that intersects with or coincides with the extension line Ly. In FIG. 8, the horizontal line La2 is a line that coincides with the extension line Ly, but the upper end 121 may be inclined with respect to the horizontal direction so that the extension line Ly and the horizontal line La2 intersect. The angle θ2 between the upper end 121 of the inner wall of the flame stabilizing hole groove 33C and the horizontal direction is smaller than the angle θ3 between the opposing surface 66A and the horizontal direction. In this embodiment, the opposing surface 66A is inclined at an angle θ3 with respect to the horizontal direction over the entire circumference around the central axis G. In other words, the angle θ3 is the angle between the opposing surface 66A and the horizontal direction in each cross section passing through the central axis G. In the cross section of FIG. 8, the opposing surface 66A is also inclined at an angle θ3 with respect to the horizontal direction, and in the cross section of FIG. 9, the opposing surface 66A is also inclined at the same angle (angle θ3 shown in FIG. 8) with respect to the horizontal direction. In the cross section of FIG. 8, an extension line of the straight line showing the opposing surface 66A is Lz. The horizontal line La3 is a horizontal line that intersects with the extension line Lz.

[0045] As shown in FIG. 9, the upper end 111 of the inner wall of the main burner hole groove 33A extends in the first reference direction. The angle θ1 is the angle between the direction in which the upper end 111 of the inner wall of the main burner hole groove 33A extends (first reference direction) and the horizontal direction. FIG. 9 is an enlarged view of a cross-sectional view cut along a cutting plane passing through the central axis G and the upper end 111 of one of the main burner hole grooves 33A. In the cross-sectional view of FIG. 9, an extension line of the straight line showing the upper end 111 is Lx. The horizontal line La1 is a horizontal line that intersects with the extension line Lx. When the angle θ1 is set in this way, the angle θ2 is smaller than the angle θ1 (FIG. 9) between the upper end 111 of the inner wall of the main burner hole groove 33A and the horizontal direction.

[0046] In this specification, the horizontal direction is a planar direction parallel to a plane perpendicular to the up-down direction, and in the examples of Figs. 7 and 8, it is a planar direction parallel to a plane perpendicular to the central axis G. In the example of Fig. 8, the direction of the extension line Ly extending from the upper end portion 121 coincides with the direction of the horizontal line La2, and θ2 is 0. The direction of the extension line Lz extending from the opposing surface 66A differs from the direction of the horizontal line La3, and θ3 is an acute angle. In the example of Fig. 9, the direction of the extension line Lx extending from the upper end portion 111 (Fig. 3) differs from the direction of the horizontal line La1, and θ1 is an acute angle. The lines La1, La2, and La3 are parallel to each other.

[0047] 6. Example of effects In the gas burner 6 for a gas stove described above, the directions of the upper wall (upper end 121 of the inner wall of the flame stabilizing hole groove 33C) and the lower wall (opposing surface 66A) of the flame stabilizing hole 120 are different, and the vertical distance between the upper end 121 and the opposing surface 66A becomes smaller as it approaches the outer circumferential surface 32A of the flange portion 32 (annular portion), so that the gas flowing out through the flame stabilizing hole 120 can be prevented from flowing largely only in the direction along the upper wall (upper end of the inner wall of the flame stabilizing hole groove 33C) or only in the direction along the lower wall (opposing surface 66A), and the flow rate of the released gas can be easily suppressed. Furthermore, the gas burner 6 can make the direction of most of the gas flowing out through the flame stabilizing hole 120 (the direction of the arrow F2 in FIG. 8) different from the direction of the gas flowing out through the main flame hole 110 (the direction of the arrow F1 in FIG. 8 and FIG. 9). Therefore, in this gas burner 6, the flow velocity suppression effect and the effect of changing the direction exert a synergistic effect, making it easy to make the gas discharged from the flame stabilizing holes 120 remain near the outlets of the flame stabilizing holes 120, and even when the main flame generated from the main flame hole 110 tries to extend outward, it is possible to prevent the flame stabilization generated from the flame stabilizing holes 120 from being dragged by the main flame and extending too far outward. Therefore, this gas burner 6 can easily stably maintain the flame stabilization near the flame stabilizing holes 120, and can easily exhibit flame stabilization performance more fully.

[0048] In the gas burner 6, the opposing surface 66A is an inclined surface that rises to an upper position as it approaches the outer periphery of the upper surface portion 66 of the burner body 6A. The upper end of the inner wall of the flame stabilization hole groove 33C extends along the horizontal direction or has a downward inclination that falls to a lower position as it approaches the outer periphery of the flange portion 32 (annular portion). This gas burner 6 is likely to prevent the flame stabilization from extending upward due to the presence of the upper end of the inner wall that extends along the horizontal direction or has a downward inclination. Therefore, this gas burner 6 can further prevent the flame stabilization from extending upward due to the influence of the main flame, even if the main flame tries to extend upward.

[0049] <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.

[0050] 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.

[0051] 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]

[0052] 1: Gas stove 4: Gas burner 5: Gas burner 6: Gas burner 6A: Burner body 20: Burner cap 21: Burner cap 22: Burner cap 30: Burner cap body 32: Flange part (annular part) 32A: Outer surface 33: Flame hole groove 33A: Main flame hole groove 33C: Flame holding hole groove 35: Bottom part 110: Main flame hole 111: Upper end 120: Flame holding hole 121: Upper end

Claims

1. A gas burner comprising a burner body for supplying gas and a burner cap attached to the burner body, The burner cap includes a cylindrical portion having a predetermined central axis as a center, and an annular portion extending from the cylindrical portion and having a plurality of flame hole grooves on a lower surface thereof, The burner body includes an upper surface portion having an annular opposing surface facing the annular portion, The burner hole groove is a main flame hole groove that is provided in a circumferential direction on the lower surface portion and forms a path for guiding the gas supplied from the burner body from the center side of the annular portion to the outside, and that constitutes a main flame hole between the opposing surface; a groove provided between two adjacent main flame hole grooves in the lower surface portion, forming a path for guiding gas supplied from the burner body, the groove having a vertical depth smaller than that of the main flame hole groove, and a flame stabilizing hole groove forming a flame stabilizing hole between the opposing surface; having an upper end portion of an inner wall of the main flame hole groove has an upward inclination shape that becomes higher as it approaches an outer circumferential surface of the annular portion; a vertical distance between an upper end of an inner wall of the flame stabilizing hole groove and the opposing surface becomes smaller as the upper end approaches an outer circumferential surface of the annular portion, The opposing surface is an inclined surface that becomes higher as it approaches the outer circumferential edge of the upper surface portion, The upper end of the inner wall of the flame stabilizing hole groove extends horizontally or has a downward inclination that becomes lower as it approaches the outer circumferential surface of the annular portion, When an angle between a first reference direction, which is a direction in which the upper end of the inner wall of the main flame hole groove extends, and a horizontal direction is defined as θ1, an angle between a second reference direction, which is a direction in which the upper end of the inner wall of the flame stabilization hole groove extends, and a horizontal direction is defined as θ2, and an angle between the opposing surface and a horizontal direction in a cutting plane passing through the central axis and the upper end of the inner wall of the flame stabilization hole groove is defined as θ3, θ1>θ2, and θ3>θ2 Gas burner for gas stove.

2. A gas burner comprising a burner body for supplying gas and a burner cap attached to the burner body, The burner cap has an annular portion having a plurality of burner hole grooves on a lower surface thereof, The burner body includes an upper surface portion having an annular opposing surface facing the annular portion, The burner hole groove is a main flame hole groove that is provided in a circumferential direction on the lower surface portion and forms a path for guiding the gas supplied from the burner body from the center side of the annular portion to the outside, and that constitutes a main flame hole between the opposing surface; a groove provided between two adjacent main flame hole grooves in the lower surface portion, forming a path for guiding gas supplied from the burner body, the groove having a vertical depth smaller than that of the main flame hole groove, and a flame stabilizing hole groove forming a flame stabilizing hole between the opposing surface; having an upper end portion of an inner wall of the main flame hole groove has an upward inclination shape that becomes higher as it approaches an outer circumferential surface of the annular portion; a vertical distance between an upper end of an inner wall of the flame stabilizing hole groove and the opposing surface becomes smaller as the upper end approaches an outer circumferential surface of the annular portion, The flame-stabilizing hole groove has a pair of wall portions arranged on both sides of the annular portion in the circumferential direction with respect to an upper end portion of an inner wall of the flame-stabilizing hole groove. The distance between the pair of walls increases toward the outer circumferential surface of the annular portion. Gas burner for gas stove.

3. The opposing surface is an inclined surface which becomes higher as it approaches the outer circumferential edge of the upper surface portion, The upper end of the inner wall of the flame stabilizing groove extends horizontally or has a downward inclination that becomes lower as it approaches the outer circumferential surface of the annular portion. A gas burner for a gas stove according to claim 2.

4. A gas stove having a gas burner for a gas stove described in any one of claims 1 to 3.

Images