JP2022173710A - Gas cooking stove - Google Patents

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

The present invention relates to gas stoves.

In the gas burner disclosed in Patent Literature 1, the burner head is provided with an ignition protrusion projecting radially outward. The ignition projection is positioned opposite the igniter. In this gas burner, the igniter is ignited by the gas ejected from the three trivet claw flame holding ports corresponding to the flame transfer portions by causing electric discharge between the igniter and the ignition protrusion.

Japanese Unexamined Patent Application Publication No. 2017-20706

In the gas burner of Patent Document 1, when an electric discharge is generated between the ignition projection and the igniter, the gas ejected from the three trivet claw flame holding ports provided in the fire transfer portion near the ignition projection is ignited. With this flame spreading portion as a starting point, the flame moves clockwise and counterclockwise when viewed from the bottom. However, with such a gas stove, if the heating power at the time of ignition is high (for example, high heating power), the flow of gas near the ignition projection (ignition target) will be too fast, and the ignition performance will be insufficient. There is concern that it will not be guaranteed.

An object of the present disclosure is to realize a gas stove that facilitates ignition more reliably even if the heating power at the time of ignition is large.

A gas stove, which is one of the present disclosure,
a burner body for supplying gas;
a burner cap that is attached to the burner main body and that includes a tubular portion and a flange portion projecting from the tubular portion;
a discharge plug;
has
A gas stove in which the burner cap includes a plurality of flame hole grooves provided on the outer peripheral portion of the flange portion, and an ignition portion forming a discharge gap between the discharge plug and the burner cap,
The plurality of flame hole grooves are
A plurality of main flame holes, which are grooves forming a path for guiding the gas supplied from the burner body from the center side of the flange portion toward the outside, and form main flame holes with respect to the facing surface of the burner body. a groove;
a plurality of flame-transfer flame hole grooves provided between the two main flame-hole grooves and forming flame-transfer flame holes with the opposing surface;
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,
second flame hole grooves, which are part of the plurality of flame-transfer flame hole grooves, are arranged between the two first flame hole grooves in the circumferential direction,
The ignition part is
a guide groove that guides the gas that has flowed through the second flame hole groove to the radially outer side of the flange;
an ignition target at least partially provided outside the guide groove in the radial direction and forming the discharge gap with the discharge plug;
a cap portion extending radially outward from the guide groove and covering the space around the ignition target from above;
with
The guide groove, the ignition target, and the cap portion are integrally formed and extend radially outward.

According to the technology according to the present disclosure, even if the thermal power at the time of ignition is large, it is easier to perform ignition more reliably.

FIG. 1 is a perspective view schematically illustrating the gas stove of the first embodiment. FIG. FIG. 2 is a perspective view illustrating a gas burner used in the gas stove of the first embodiment. 3 is a schematic cross-sectional view of the gas burner of FIG. 2. FIG. FIG. 4 is an exploded perspective view showing a part of the gas burner of FIG. 2 exploded. FIG. 5 is a perspective view of the burner cap body of the gas burner of FIG. 2 as seen from below. 6 is a bottom view of the burner cap body of FIG. 5. FIG. FIG. 7 is a schematic cross-sectional view schematically showing a part of the cut surface of the gas burner for the gas stove of the first embodiment cut along the central axis and the position of the ignition target (position AA in FIG. 6). 8 is an enlarged perspective view showing the vicinity of the ignition part in the burner cap main body of FIG. 5, and is a perspective view showing a state in which the burner cap main body is turned upside down. 9 is an enlarged view showing the vicinity of the ignition portion in the bottom view of FIG. 6. FIG.

Embodiments of the present disclosure are listed and illustrated below. The features [1] to [5] exemplified below may be combined in any way in a consistent combination.

[1] a burner body for supplying gas;
a burner cap that is attached to the burner main body and that includes a tubular portion and a flange portion projecting from the tubular portion;
a discharge plug;
has
A gas stove in which the burner cap includes a plurality of flame hole grooves provided on the outer peripheral portion of the flange portion, and an ignition portion forming a discharge gap between the discharge plug and the burner cap,
The plurality of flame hole grooves are
A plurality of main flame holes, which are grooves forming a path for guiding the gas supplied from the burner body from the center side of the flange portion toward the outside, and form main flame holes with respect to the facing surface of the burner body. a groove;
a plurality of flame-transfer flame hole grooves provided between the two main flame-hole grooves and forming flame-transfer flame holes with the opposing surface;
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,
second flame hole grooves, which are part of the plurality of flame-transfer flame hole grooves, are arranged between the two first flame hole grooves in the circumferential direction,
The ignition part is
a guide groove that guides the gas that has flowed through the second flame hole groove to the radially outer side of the flange;
an ignition target at least partially provided outside the guide groove in the radial direction and forming the discharge gap with the discharge plug;
a cap extending radially outward from the guide groove and covering the space around the ignition target from above;
with
A gas stove in which the guide groove, the ignition target, and the cap portion are integrally formed and extend radially outward.

In the gas stove according to [1], the gas supplied from the burner body to the second burner hole groove is supplied to the vicinity of the discharge gap through the guide groove. When a discharge is generated between the discharge plug and the ignition target while the gas is supplied near the discharge gap in this manner, the gas near the discharge gap is ignited, and ignition is performed so that the flame moves in the circumferential direction. be. Even if the flow velocity of the gas flowing through the guide groove near the discharge gap is high to some extent, the gas is received by the cap covering the space around the ignition target from above, and the gas tends to be decelerated. is unlikely to be blown out. Therefore, even if the heating power at the time of ignition is large, this gas stove can more reliably ignite.

[2] The gas stove according to [1], wherein the lower surface of the cap portion has a curved surface, and the height of the curved surface decreases as the distance from the ignition target increases.

In the gas stove according to [2], the lower surface of the cap portion has a curved surface, and the curved surface is dome-shaped in the vicinity of the ignition target so that the position becomes lower as the distance from the ignition target increases. The gas that has flowed in is more likely to be decelerated and more likely to stay. Therefore, this gas stove is easier to ignite more reliably.

[3] 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 substantially the same [1] or The gas stove according to [2].

If the radial length from the ignition target to the radial tip of the cap portion is too small, the effect of decelerating the gas is reduced, and if it is too large, the flame from the main flame hole groove tends to burn the gas. As in the gas stove described in [3], if the radial length from the ignition target to the radial tip of the cap portion is substantially the same as the radial length of the region of the guide groove and the ignition target, the gas is A balance can be achieved between the effect of deceleration and the effect of suppressing burning due to flames from the main flame hole grooves.

[4] The second flame hole groove has a flame holding hole groove provided with an outlet portion below the guide groove,
The outlet portion constitutes an outflow path along the radial direction,
The gas stove according to any one of [1] to [3], wherein an inlet portion of the flame-stabilizing hole groove constitutes an inflow path inclined with respect to the radial direction.

In the gas stove according to [4], when gas is supplied to the guide groove through the flame-stabilizing hole groove, the gas is allowed to flow in a direction inclined with respect to the radial direction at the entrance portion of the flame-stabilizing hole groove, and then At the outlet, the gas can flow in an outflow path along the radial direction. Since the direction of gas flow is forcibly changed in the flame-stabilizing grooves in this way, the gas can be decelerated even in the flame-stabilizing grooves. Therefore, the effect of decelerating the gas in the flame-stabilizing hole groove and the effect of decelerating the gas in the vicinity of the cap exhibit a synergistic effect, and the ignition performance can be significantly improved.

[5] The flange portion has an outer peripheral surface on which a plurality of ends of the main flame hole grooves are provided,
The igniter includes a thick portion connected between the two first burner hole grooves on the outer peripheral surface and extending outward in the radial direction from the outer peripheral surface, and a thickness thinner than the thick portion. and a thin portion extending outward in the radial direction from the thick portion, and
The ignition target and the guide groove are provided in the thick portion,
The cap portion is provided in the thin portion,
The gas stove according to any one of [1] to [4], wherein the lower surface of the cap portion is provided above the lower end portion of the ignition target.

The gas stove described in [5] can provide a thick portion at the base of the ignition portion to provide a strong structure, and can ignite more reliably in the relatively thick portion. Furthermore, since the thin-walled portion is arranged radially outward of the thick-walled portion and the capped portion is provided at that portion, the capped portion is provided radially outwardly of the ignition target, and the lower surface of the capped portion is the lower end portion of the ignition target. It is easy to realize a configuration "provided above" in a simpler and more compact manner. In addition, since "the lower surface of the cap portion is provided above the lower end of the ignition target", the lower surface of the cap portion tends to receive the gas flowing radially outward, and the gas tends to stay near the cap portion. .

<First Embodiment>
Below, the gas stove 1 provided with the gas burners 4, 5, and 6 for gas stoves of 1st Embodiment, etc. are demonstrated.

1. Overview of Gas Stove A gas stove 1 shown in FIG. 1 is, for example, a built-in stove incorporated in a cabinet (not shown in FIG. 1). A gas stove 1 includes gas burners (stove burners) 4, 5, 6, a housing 2, a top plate 3, a grill portion 8, and the like.

In the following description, in the gas stove 1 shown in FIG. 1, the front-rear direction is the first direction among the plate surface directions of the top plate 3 configured in a plate shape. The plate surface direction is a plane direction parallel to a predetermined flat surface forming the upper surface of the top plate 3 . In the representative examples (FIG. 1, etc.) described below, the lateral direction when the top plate 3 is viewed from above is the first direction and the front-rear direction. In the representative example (FIG. 1, etc.), the second direction orthogonal to the first direction is the left-right direction among the plate surface directions of the top plate 3 . In the above representative example (FIG. 1, etc.), the longitudinal direction when the top plate 3 is viewed from above is the second direction, which is the left-right direction. A direction orthogonal to the front-rear direction and a direction orthogonal to the left-right direction is the vertical direction. In the above representative example (FIG. 1, etc.), the plate thickness direction of the top plate 3 is the third direction, which is the vertical direction.

The housing 2 shown in FIG. 1 is mainly made of, for example, a known metal material. The housing 2 forms an outer shell of the gas stove 1 . The housing 2 accommodates part or all of the gas burners 4, 5, 6 and other parts. The housing 2 has a pair of side wall portions on both sides in the left-right direction, and a rear wall portion (not shown in FIG. 1) is provided so as to be connected to rear end portions of the pair of side wall portions. The front part (not shown in FIG. 1) of the housing 2 is configured in a frame shape or a wall shape, and has, for example, a frame part arranged in a manner to bridge the pair of side wall parts described above. Further, a bottom wall portion (not shown in FIG. 1) is connected to lower portions of the front portion, the pair of side wall portions, and the rear wall portion. The housing 2 is configured such that its internal space is surrounded by the front face, a pair of side walls, the rear wall and the bottom wall, and has a box-like shape with an open upper end.

A top plate 3 shown in FIG. 1 is fixed to the upper end of the housing 2 . The top plate 3 is arranged on the housing 2 so as to partially or wholly close the opening at the upper end of the housing 2 . The top plate 3 has a plate-like shape that is rectangular in 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. As shown in FIG.

Gas burners 4, 5 and 6 shown in FIG. 1 are provided so as to correspond to openings 3A, 3B and 3C formed in top plate 3, respectively. A gas burner 4 is arranged so as to be inserted into an opening 3</b>A provided at a position near the right end and near the front end of the top plate 3 . A gas burner 5 is arranged so as to be inserted into an opening 3B provided at a position near the left end and near the front end of the top plate 3 . A gas burner 6 is arranged so as to be inserted into an opening 3</b>C provided in the center of the top plate 3 in the left-right direction and near the rear end. A grill portion 8 is provided near the central portion of the housing 2 in the left-right direction. The grill unit 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, and a gas burner arranged in the grill chamber (see FIG. 1). 1, detailed illustration is omitted), and the like.

As shown in FIG. 1 , two ignition buttons 11 and 14 are provided on the front surface of the gas stove 1 at positions near the right end of the gas stove 1 . Two ignition buttons 12 and 13 are provided at positions near the left end of the gas stove 1 in the front part of the gas stove 1 . The ignition button 11 is an operation button for performing ignition operation and extinguishing operation of 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 portion 8 . The ignition buttons 11, 12, 13, and 14 are 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 protruding forward and a retracted position retreating rearward from the protruding position. Each ignition button 11, 12, 13, 14 is rotatable, and the heating power of the gas burner corresponding to each button is adjusted according to the rotational position of each ignition button 11, 12, 13, 14.

A plurality of openings 3A, 3B, 3C provided in the top plate 3 are through holes. A burner cap 21 that constitutes the head of the gas burner 4 is arranged in the opening 3A. A burner cap 22 that constitutes the head of the gas burner 5 is arranged in the opening 3B. A burner cap 20 that constitutes the head of the gas burner 6 is arranged in the opening 3C. The two burner caps 21, 22 are of identical construction. The burner caps 21, 22 and the burner cap 20 have the same configuration except that they differ in size. Metal trivets 7 are provided on the top plate 3 so as to surround the burner caps 20, 21 and 22, respectively.

2. Overview of Gas Burner The configuration and operation of the gas burner 6 will mainly be described in detail below.
As shown in FIGS. 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 to the housing 2 directly or indirectly via another member. The gas burner 6 straddles the upper and lower sides of the top plate 3 through the opening 3C.

A burner body 6A shown in FIGS. 2 and 3 is a component for supplying combustion gas. The burner body 6A mainly includes a cylindrical lower portion 6B and a throat portion 6C connected to the lower portion 6B. The lower portion 6B is a portion that faces the burner cap 20 from below. The lower portion 6B is a portion that forms the air-fuel mixture chamber 6Z inside itself, and is configured to surround the outside of the space within the air-fuel mixture chamber 6Z. The lower portion 6B receives and supports the flange portion 32 of the burner cap main body 30, for example. The throat portion 6C is a tubular portion extending from the lower portion 6B, and is a portion that constitutes a pipeline through which gas flows. The throat portion 6C functions as a mixing pipe for mixing fuel gas and combustion air. The air-fuel mixture chamber 6Z shown in FIG. 3 communicates with the inside of the throat portion 6C (FIG. 2). The air-fuel mixture chamber 6Z constitutes a space in which the fuel gas supplied through the throat portion 6C and the combustion air are mixed.

The burner cap 20 shown in FIGS. 2 and 3 functions as a burner head. The burner cap 20 is a component that is attached to the burner main body 6A, and is a component that is arranged above the lower arrangement portion 6B. The burner cap 20 has an annular shape as a whole. The burner cap 20 includes an annular burner cap body 30 and a cover body 40 fixed to the burner cap body 30 . The burner cap 20 has a burner cap main body 30 and a cover body 40 assembled together. The burner cap main body 30 is a component having a burner hole groove 33 formed in its outer peripheral portion. The cover body 40 is a component that covers the burner cap body 30 . As shown in FIG. 1, in the vicinity of one of the flame hole grooves 33, a discharge plug 10 for ignition and a thermocouple (not shown) for detecting flame are provided. 2, 4, etc., only the reference numerals of some of the burner hole grooves 33 are shown.

As shown in FIGS. 2 and 3, the temperature sensor 9 is arranged so as to penetrate through the lower portion 6B and the center of the burner cap 20. As shown in FIG. The temperature sensor 9 functions to contact the bottom of a cooking utensil (such as a cooking pot) placed on the trivet 7 to detect the temperature of the bottom of the cooking utensil. In FIG. 3, parts other than the temperature sensor 9 are shown in cross section, and the configuration of the temperature sensor 9 is schematically shown in a side view. FIG. 3 is a diagram schematically showing a cross section taken along a cutting plane passing through the main flame hole groove 33A and passing through the central axis G. As shown in FIG.

In the gas stove 1 shown in FIG. 1, for example, when the ignition button 13 is ignited (pressed), primary air and fuel gas are supplied to the burner body 6A shown in FIGS. , and flows out from a large number of flame hole grooves 33 of the burner cap 20 attached to the burner main body 6A. When the ignition button 13 is ignited (pressed), a controller (not shown) provided inside the gas stove 1 causes the discharge plug 10 near the burner cap 20 shown in FIGS. 2 and 3 to spark. to ignite the air-fuel mixture and generate a flame around the burner cap 20 . As a result, the bottom portion of the cooking utensil placed on the trivet 7 around the burner cap 20 can be heated, enabling cooking with heat.

3. Burner Main Body The burner main body 6A has a configuration in which a lower portion 6B and a throat portion 6C are integrally connected. The lower portion 6B is a cylindrical base on which the burner cap 20 is mounted. The lower arrangement portion 6B includes a cylindrical portion 60 and a lower connecting portion 70. As shown in FIG.

As shown in FIG. 4, the cylindrical portion 60 is cylindrical and constitutes the upper end portion side of the burner main body 6A. The cylindrical portion 60 is a portion that constitutes an inner wall portion on the outside of the mixture chamber 6Z. The cylindrical portion 60 includes an inner peripheral wall portion 62 , an outer peripheral wall portion 64 and an upper surface portion 66 . The inner peripheral wall portion 62 is configured in a cylindrical shape and forms an outer inner wall portion of the air-fuel mixture chamber 6Z. The inner peripheral surface of the inner peripheral wall portion 62 is a cylindrical surface centered on a predetermined central axis G shown in FIG. The outer peripheral wall portion 64 is configured in a cylindrical shape so as to surround the inner peripheral wall portion 62 . The upper surface portion 66 connects the upper end portion of the inner peripheral wall portion 62 and the upper end portion of the outer peripheral wall portion 64 . The upper surface portion 66 constitutes the upper end portion of the burner main body 6A. The upper surface portion 66 is arranged in an annular shape. The upper surface portion 66 is provided with a facing surface 66A. The facing surface 66A is an annular surface that faces the flange portion 32 (annular portion) of the burner cap 20 . The facing surface 66A is arranged to face each flame hole groove 33 . 66 A of opposing surfaces are arrange|positioned at the annular|circular shape centering on the central axis line G. As shown in FIG. The facing surface 66A is an inclined surface that becomes lower toward the inner side (toward the inner peripheral wall portion 62), and is configured in the shape of a mortar as a whole. The facing surface 66A has a smaller diameter (diameter) centered on the central axis G at a lower position. The facing surface 66A desirably functions as a support surface that supports the flange portion 32 of the burner cap body 30 from below.

A lower connecting portion 70 that is connected to the cylindrical portion 60 is provided below the cylindrical portion 60 . The lower connecting portion 70 includes an annular outer wall portion 72 connected to the inner peripheral wall portion 62 , a bottom wall portion 78 connected to the lower end portion of the outer wall portion 72 , and a cylindrical shape rising upward from the bottom wall portion 78 . A support cylinder 76 is provided. An upper end portion of the outer wall portion 72 is connected to a lower end portion of the inner peripheral wall portion 62, and the outer wall portion 72 and the inner peripheral wall portion 62 form an outer inner wall portion (annular wall portion) of the air-fuel mixture chamber 6Z. The bottom wall portion 78 functions as a bottom wall of the air-fuel mixture chamber 6Z. The support tube 76 is arranged across the inner region of the inner peripheral wall portion 62 and the inner region of the outer wall portion 72 in the vertical direction. The support tube 76 has a cylindrical shape centered on the central axis G and has an open upper end. The cylindrical portion 31 of the burner cap main body 30 is inserted into the support cylinder 76 from above. The cylindrical portion 31 and the support cylinder 76 constitute an inner wall portion (annular wall portion) inside the air-fuel mixture chamber 6Z. The outer wall portion 72 is configured integrally with the throat portion 6C. The internal space of the outer wall portion 72 (the space within the air-fuel mixture chamber 6Z) allows gas to flow from the internal space of the throat portion 6C.

4. Burner Cap The following description relates to the detailed configuration of the burner cap 20 .
As shown in FIGS. 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 positioned below the cover body 40 . The burner cap main body 30 has a cylindrical shape. The burner cap main body 30 is made of a metal material such as aluminum die-cast. The burner cap main body 30 includes a tubular portion 31 having a cylindrical shape and a flange portion 32 projecting from an upper end portion of the tubular portion 31 .

As shown in FIG. 3, the tubular portion 31 is formed in a cylindrical shape with a predetermined central axis G as the center of the cylinder, and extends along the central axis G. As shown in FIG. 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. As shown in FIG. 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 the cylindrical surface centered on the central axis G. As shown in FIG. The upper end of the tubular portion 31 constitutes an upper end opening of the burner cap 20 . The lower end of the tubular portion 31 constitutes the opening of the lower end of the burner cap 20 . A vertically extending through hole 36 is formed in the central portion of the burner cap body 30 . The inside of the through hole 36 is configured to allow gas to pass through in the vertical direction. The inner peripheral portion of the cylindrical portion 31 constitutes a through hole 36 and functions as a hole extending from the upper end portion to the lower end portion of the burner cap 20 .

As shown in FIG. 3 , the flange portion 32 is configured as a portion projecting outward in a radial direction about the center 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 configured as a portion that is connected to the upper end portion of the cylindrical portion 31 and protrudes outward in the radial direction about the central axis G from the upper end portion. The flange portion 32 and the cylindrical portion 31 are integrally made of, for example, the same metal material. An upper surface portion 34 is provided on the flange portion 32 . The upper surface portion 34 is a portion that constitutes the upper plate surface of the flange portion 32 . The second projecting 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. As shown in FIG. A plurality of flame hole grooves 33 are provided in the lower surface portion 35 of the flange portion 32 . When the burner cap 20 is attached to the burner main body 6A as shown in FIG. 3, the lower surface portion 35 of the flange portion 32 is arranged to face the facing surface 66A of the burner main body 6A. In the attached state of FIG. 3, it is desirable that the lower surface portion 35 of the flange portion 32 is placed in contact with the facing surface 66A.

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 (for example, made of stainless steel). As shown in FIGS. 2 to 4, the cover body 40 has a body portion 41, a first projecting portion 42, and a second projecting portion 43. As shown in FIGS. In the cover body 40, the body portion 41, the first projecting portion 42, and the second projecting portion 43 are integrally formed of the same material.

As shown in FIGS. 3 and 4, the body portion 41 is configured as a circular annular plate that covers the flange portion 32 of the burner cap body 30 from above. As shown in FIG. 3, the first protruding portion 42 is bent from the main body portion 41 by, for example, metal working (bending or the like). The second protruding portion 43 is bent from the main body portion 41 by, for example, metal working (bending or the like). The cover body 40 is subjected to surface treatment (for example, barrel polishing) and has a smooth and glossy structure. A through hole 44 having a diameter substantially equal to that of the through hole 36 of the burner cap main body 30 is provided in the central portion of the cover body 40 so as to pass through the main body portion 41 in the thickness direction. The through-hole 44 is arranged in communication with the through-hole 36 so as to continue above the internal space of the above-described through-hole 36 .

As shown in FIGS. 3 and 4 , the first projecting portion 42 projects downward from the circular inner edge portion of the body portion 41 . The protrusion length of the first protrusion 42 is greater than the protrusion length of the second protrusion 43 . The first projecting portion 42 is cylindrical. The first projecting portion 42 is inserted into the tubular portion 31 . The first projecting portion 42 is fixed to the tubular portion 31 while being in contact with the inner peripheral portion 39 of the tubular portion 31 . Specifically, a concave portion 50 is provided in the inner peripheral portion 39 of the cylindrical portion 31, and a hook portion 47 forming a part of the first projecting portion 42 enters the concave portion 50 and is hooked on the concave portion 50. The first projecting portion 42 is configured not to come off from the cylindrical portion 31 . With such a configuration, the cover body 40 is fixed to the burner cap main body 30 .

5. Configuration near Ignition Portion As shown in FIGS. 4 and 5, the burner cap 20 is provided between a plurality of flame hole grooves 33 provided on the outer peripheral portion of the flange portion 32 and the discharge plug 10 (FIGS. 1 and 7). and an ignition part 100 forming a discharge gap Z.

As shown in FIGS. 6 and 7, the ignition portion 100 is provided so as to extend radially outward from the cylindrical outer peripheral surface 32A of the plate-like and disk-like flange portion 32 . A cylindrical outer peripheral surface 32A of the flange portion 32 has a curved surface provided with the ends of the respective flame hole grooves 33, such as the ends of the plurality of main flame hole grooves 33A and the ends of the plurality of flame spread flame hole grooves 33B. It is the surface. Specifically, the outer peripheral surface 32A is a surface along a cylindrical surface centered on the central axis G (a surface having a predetermined distance from the central axis G). The ignition portion 100 is configured as a protrusion protruding from the outer peripheral surface 32A along the radial direction. In this specification, the radial direction is a direction parallel to "a direction passing through the central axis G and orthogonal to the central axis G", and is a radial direction of a cylinder centered on the central axis G. In FIG. 9 , a straight line L1 indicates a radial direction passing through the tip of the ignition target 150 .

Of the flame hole grooves 33, the main flame hole groove 33A is a groove forming a path for guiding the gas supplied from the burner main body 6A from the center side of the flange portion 32 toward the outside. It is a groove that constitutes the main flame hole 110 with the facing surface 66A of the main body 6A. In the example of FIGS. 8 and 9, of the plurality of main flame hole grooves 33A provided on one circumferential side of the ignition portion 100, the groove closest to the ignition portion 100 is one of the main flame hole grooves 33X. Of the plurality of main flame hole grooves 33A provided on the other circumferential side of the ignition portion 100, the groove closest to the ignition portion 100 is the other main flame hole groove 33Y.

Among the flame hole grooves 33, the flame-transfer flame hole groove 33B is provided between the two main flame hole grooves 33A, and forms the flame-transfer flame hole 124 with the opposing surface 66A. In the example of FIG. 8, the inner flame hole grooves 160, 171, and 172 of the plurality of flame-transfer flame hole grooves 33B are provided between one main flame hole groove 33X and the other main flame hole groove 33Y. . The inner flame hole grooves 160, 171, and 172 are flame hole grooves provided radially inward of the ignition portion 100 among the plurality of 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 burner hole grooves 160, which are part of the plurality of flame hole grooves 33B, correspond to an example of "second burner hole grooves" and are two main burner hole grooves 33X, 33Y (two first burner hole grooves) in the circumferential direction. It is placed between the flame hole grooves). Each outlet, which is the radially outer end of the inner burner hole grooves 160, 171, 172, is arranged between the two main burner hole grooves 33X, 33Y (two first burner hole grooves).

As shown in FIG. 8 , the ignition portion 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 and 33Y (two first flame hole grooves) on the outer peripheral surface 32A and extends radially outward from the outer peripheral surface 32A. The thin portion 102 is thinner than the thick portion 101 and extends radially outward from the thick portion 101 . The ignition portion 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 on the thin portion 102 . In the burner cap main 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.

As shown in FIG. 8, the guide groove 140 is a groove that guides the gas that has flowed through the inner flame hole grooves 160 of the plurality of flame transfer flame hole grooves 33B radially outward. The guide groove 140 is provided radially outside the outlet portion 161 of the inner flame hole groove 160 . The guide groove 140 is provided above the exit portion 161 . A radially inner end portion of the guide groove 140 is connected to the outer peripheral surface 32A of the flange portion 32 . A radially outer end of the guide groove 140 is open to the ignition target 150 side.

The inner flame hole groove 160 is a flame holding hole groove. Inlet portions 163 and 164 of the inner flame hole groove 160 (flame holding hole groove) form an inflow path inclined with respect to the radial direction. Specifically, the channel 166 within a certain range from the inlet 163 is a linear channel inclined with respect to the radial direction. A channel 167 within a certain range from the inlet portion 164 is a linear channel inclined with respect to the radial direction. The end of the channel 166 opposite to the inlet 163 and the end of the channel 167 opposite to the inlet 164 communicate with each other. Both the gas flowing through the flow path 166 and the gas flowing through the flow path 167 flow into a common flow path 168 , and the radially outer end of the common flow path 168 serves as the outlet portion 161 . It is configured. The exit portion 161 is provided below and radially inside the guide groove 140 . The outlet portion 161 constitutes an outflow path along the radial direction and functions to flow the gas supplied through the burner main body 6A radially outward.

As shown in FIG. 8 , the ignition target 150 is at least partially provided radially outside the guide groove 140 and forms a discharge gap Z ( FIG. 7 ) with the discharge plug 10 . In the example of FIG. 8 , the entire ignition target 150 is arranged radially outside the guide groove 140 . The ignition target 150 is configured as a protrusion 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 portion 130 . The radially outer end of the ignition target 150 is arranged to vertically face the discharge plug 10 (FIGS. 1 and 7) so that spark discharge is generated therebetween. A lower end portion 150A of the ignition target 150 is the lowest portion of the ignition target 150 configured as the protrusion.

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 cap portion 130 is provided above lower end portion 150A. In the examples of FIGS. 8 and 9, the entire lower surface of the cap portion 130 is provided above the lower end portion 150A. The lower surface of the cap portion 130 has a curved surface 130A, and the height (position in the vertical direction) of the curved surface 130A decreases as the distance from the ignition target 150 increases. The ignition target 150 protrudes downward from the upper end side surface of the curved surface 130</b>A, and a part of the ignition target 150 is inside the cap portion 130 . The uppermost portion of the curved surface 130A is provided radially outside the ignition target 150 . The uppermost portion is arranged radially inward on the curved surface 130A, closer to the end, and radially closer to the ignition target 150 on the curved surface 130A. The curved surface 130A becomes lower as it becomes radially outward from the uppermost portion. In addition, the curved surface 130A becomes lower as it moves away from the uppermost portion in the horizontal direction (the direction orthogonal to the direction of L1 and the vertical direction). Furthermore, as shown in FIG. 9, the radial length X1 of the region of the guide groove 140 and the ignition target 150 and the radial length X2 from the ignition target 150 to the radial tip 132 of the cap portion 130 are approximately are identical.

6. Example of Effect In the gas stove 1, the gas supplied from the burner body 6A to the inner burner hole groove 160 (second burner hole groove) passes through the guide groove 140 and is supplied to the vicinity of the discharge gap Z (FIG. 7). When the discharge is generated between the discharge plug 10 and the ignition target 150 while the gas is supplied near the discharge gap Z (FIG. 7), the gas near the discharge gap Z (FIG. 7) is ignited. , so that the flame travels in the circumferential direction. Even if the flow velocity of the gas flowing into the vicinity of the discharge gap Z (FIG. 7) through the guide groove 140 is high to some extent, the gas is received by the cap portion 130 covering the space around the ignition target 150 from above, and the gas is decelerated. Since it is easy to burn, it is unlikely that the flame will be blown out immediately after ignition. Therefore, this gas stove 1 can more reliably ignite even if the heating power at the time of ignition is large.

Since the curved surface 130A of the cap portion 130 has a dome shape such that the position becomes lower in the vicinity of the ignition target 150 as the distance from the ignition target 150 increases, the gas that has flowed into the vicinity of the ignition target 150 is more easily decelerated and stays more. Cheap. Therefore, this gas stove 1 is easier to ignite more reliably.

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 decelerating the gas is reduced. . If, like the gas stove 1, the radial length X2 from the ignition target 150 to the radial tip 132 of the cap portion 130 is substantially the same as the radial length X1 of the region of the guide groove 140 and the ignition target 150, , the "effect of slowing down the gas" and the "effect of suppressing burning due to the flame from the main flame hole groove 33A" can be balanced.

When gas is supplied to the guide groove 140 through the inner flame hole groove 160 (flame holding hole groove), the gas stove 1 radially moves at the inlet portions 163 and 164 of the inner flame hole groove 160 (flame holding hole groove). The gas can be caused to flow in an inclined direction with respect to the outlet portion 161, and then flow in an outflow path along the radial direction at the outlet portion 161. Since the direction of gas flow is forcibly changed in the inner flame hole grooves 160 (flame holding hole grooves) in this way, the gas can be decelerated even in the inner flame hole grooves 160 (flame holding hole grooves). 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 shade portion 130 exhibit a synergistic effect, and ignition performance can be significantly improved.

The gas stove 1 has a thick portion 101 at the base portion of the ignition portion 100 to provide a strong structure, and the relatively thick portion can ignite more reliably. Furthermore, since the thin portion 102 is arranged radially outside the thick portion 101 and the cap portion 130 is provided at that portion, the cap portion is provided radially outside the ignition target, and the lower surface of the cap portion is the ignition target. It is easy to realize the configuration "provided above the lower end of the" in a simpler and more compact manner. In addition, since "the lower surface of the cap portion 130 is provided above the lower end portion 150A of the ignition target 150", the gas flowing radially outward is easily received by the lower surface of the cap portion 130, and the gas flows into the cap portion 130. Easy to stay nearby.

In the examples of FIGS. 7 and 8, the shade portion 130 is offset so as to extend slightly above the main flame hole grooves 33X and 33Y (two first flame hole grooves). The curved surface 130A is arranged radially outside the main flame hole grooves 33X and 33Y above the upper end portions of the main flame hole grooves 33X and 33Y (the upper wall portions of the main flame hole grooves 33X and 33Y). ing. Specifically, the entire curved surface 130A is located radially outside the main flame hole grooves 33X and 33Y above the upper end portions of the main flame hole grooves 33X and 33Y. More specifically, the entire cap portion 130 is arranged radially outside the main flame hole grooves 33X and 33Y above the upper end portions of the main flame hole grooves 33X and 33Y. Because of this configuration, the cap portion 130 easily receives the gas emitted upward from the two main flame hole grooves 33X and 33Y, and the gas tends to stay in the vicinity of the cap portion 130.

<Other embodiments>
The invention is not limited to the embodiments illustrated by the above description and drawings. For example, the features of the embodiments described above or below can be combined in any consistent manner. Also, any feature of the embodiments described above or below may be omitted if not explicitly indicated as essential. Furthermore, the embodiments described above may be modified as follows.

In the description of the above embodiments, the gas stove 1 configured as a built-in stove was exemplified as an example of the stove, but the stove may be another type of stove such as a table stove.

It should be noted that the embodiments disclosed this time should be considered as examples in all respects and not restrictive. The scope of the present invention is not limited to the embodiments disclosed this time, and includes all modifications within the scope indicated by the claims or within the scope equivalent to the claims. is intended.

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 peripheral surface 33: Burner hole groove 33A: Main burner hole groove 33B: Fire spread burner hole groove 33X: Main burner hole groove (first burner hole groove)
33Y: Main burner hole groove (first burner hole groove)
100: Ignition portion 110: Main flame hole 124: Flame spread flame hole 130: Cap portion 130A: Curved surface 132: Radial tip 140: Guide groove 150: Ignition target 160: Inner flame hole groove (second flame hole groove)
161: outlet portion 163: inlet portion 164: inlet portion Z: discharge gap

Claims (5)

a burner body for supplying gas;
a burner cap that is attached to the burner main body and that includes a tubular portion and a flange portion projecting from the tubular portion;
a discharge plug;
has
A gas stove in which the burner cap includes a plurality of flame hole grooves provided on the outer peripheral portion of the flange portion, and an ignition portion forming a discharge gap between the discharge plug and the burner cap,
The plurality of flame hole grooves are
A plurality of main flame holes, which are grooves forming a path for guiding the gas supplied from the burner body from the center side of the flange portion toward the outside, and form main flame holes with respect to the facing surface of the burner body. a groove;
a plurality of flame-transfer flame hole grooves provided between the two main flame-hole grooves and forming flame-transfer flame holes with the opposing surface;
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,
second flame hole grooves, which are part of the plurality of flame-transfer flame hole grooves, are arranged between the two first flame hole grooves in the circumferential direction,
The ignition part is
a guide groove that guides the gas that has flowed through the second flame hole groove to the radially outer side of the flange;
an ignition target at least partially provided outside the guide groove in the radial direction and forming the discharge gap with the discharge plug;
a cap extending radially outward from the guide groove and covering the space around the ignition target from above;
with
A gas stove, wherein the guide groove, the ignition target, and the cap portion are integrally formed and extend radially outward. A lower surface of the cap portion has a curved surface,
The gas stove according to claim 1, wherein the height of the curved surface decreases as the distance from the ignition target increases. 3. The radial length of the regions 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 substantially the same. The gas stove described in . The second flame hole groove has a flame holding hole groove provided with an outlet portion below the guide groove,
The outlet portion constitutes an outflow path along the radial direction,
The gas stove according to any one of claims 1 to 3, wherein an inlet portion of the flame-stabilizing hole groove constitutes an inflow path inclined with respect to the radial direction. the flange portion has an outer peripheral surface on which a plurality of ends of the main flame hole grooves are provided;
The igniter includes a thick portion connected between the two first burner hole grooves on the outer peripheral surface and extending outward in the radial direction from the outer peripheral surface, and a thickness thinner than the thick portion. and a thin portion extending outward in the radial direction from the thick portion, and
The ignition target and the guide groove are provided in the thick portion,
The cap portion is provided in the thin portion,
The gas stove according to any one of claims 1 to 4, wherein a lower surface of the cap portion is provided above a lower end portion of the ignition target.

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