JP2017187207A - Coking stove with grill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent combustion from being stopped in the middle of heating cooking to improve user-friendliness, even in a case of using a cooking container in an existing grill.SOLUTION: A built-in cooking stove 1 is configured such that in the vicinity of an outlet provided at the rear of a grill box 6, provided is a temperature sensor 18 configured to detect a temperature of combustion exhaust, while in the grill box 6, receiving parts 29, 29 capable of selectively supporting a gridiron and a mounting base 32 for mounting a cooling container 50 in the grill 6 are provided in a front-back direction. At the rear of the mounting base 32, provided is a detour member 39 positioned in front of the temperature sensor 18 in a state of being supported at the receiving parts 29, 29, and configured to prevent combustion exhaust occurring in the grill box 6 from directly flowing to the temperature sensor 18.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stove with a grill such as a table stove equipped with a grill and a built-in stove.

Conventionally, grills in a stove with a grill have been mainly used for cooking fish, but in recent years, grills have become more versatile and used for cooking other than fish such as toast and pizza. It has become.
However, fish is cooked by placing the fish on a grill provided on the grill and directly heating it with a grill burner, so that oil, moisture, etc. generated from the fish adhere to the inner surface of the grill cabinet and produce a raw odor. In many cases, it remains as a fishy odor, and there is a considerable psychological resistance to users who want to use it as other cooking such as toast.

  Therefore, as disclosed in Patent Document 1, a grill is proposed in which a cooking container with a lid that accommodates an object to be cooked is used and the cooking container is set in a grill and heated by a grill burner. According to this grill, it is possible to prevent oil and moisture generated from the food to be cooked such as fish from being enclosed in the cooking container and adhere to the grill warehouse, and the food to be cooked such as toast can be cooked without resistance. It becomes like this.

Japanese Patent Laid-Open No. 2006-7426

By the way, in the grill disclosed in Patent Document 1, a burner for heating the cooking container from the bottom, a detection mechanism for detecting the set of the cooking container, a mechanism for contacting the temperature sensor with the bottom of the cooking container, and the like. It is desirable to be able to use the cooking container in an existing grill because it introduces a dedicated mechanism for use and becomes expensive. Therefore, for example, by using a grill net supporting the grill net, a support for the cooking container is supported on the receiving part of the grill net, and the cooking container is placed on this mounting table so that it is heated by the grill burner. Can be considered.
However, when heated using a cooking container, steam and the like are contained in the cooking container, and therefore, combustion exhaust gas at a higher temperature is more likely to occur than when cooking fish or the like directly. For this reason, the detection temperature of the temperature sensor for preventing overheating provided at the exhaust outlet of the grill warehouse rises at an early stage, and there is a problem that the combustion of the grill burner is forcibly stopped during cooking and the usability is impaired.

  Therefore, the present invention has an object to provide a stove with a grill that is easy to use without stopping combustion in the middle of heating cooking even when a cooking container is used in an existing grill.

In order to achieve the above-mentioned object, the invention according to claim 1 is provided with a grill that performs cooking by combustion means, and detects the temperature of the combustion exhaust near the outlet of the combustion exhaust provided at the rear of the grill. A temperature detector is provided, and a grille is provided with a receiving part that can selectively support a grill net and a placing table for placing a cooking container in the grille. A stove,
A detour member is provided at the rear of the mounting table and is positioned in front of the temperature detecting means while being supported by the receiving portion, and prevents the combustion exhaust generated in the grille from flowing directly to the temperature detecting means. It is characterized by that.
According to a second aspect of the present invention, in the configuration of the first aspect, the combustion means includes a gas burner for heating the lower space of the cooking container supported by the receiving portion via the mounting table, and the bypass member is the mounting table. And a vertical plate portion bent downward from the rear portion.
The invention according to claim 3 is characterized in that, in the configuration of claim 2, the lower plate of the vertical plate portion is formed by bending a horizontal plate portion that protrudes rearward and is close to the rear inner surface of the grill cabinet. To do.
According to a fourth aspect of the present invention, in the configuration of the second or third aspect, the gas burner has a plurality of flame openings arranged in the front-rear direction, and the mounting table has a dimension in the front-rear direction. It is formed longer than the arrangement range, and the intermediate portion on which the cooking container is placed is opposed to the arrangement range of the flame opening while being supported by the receiving portion.
According to a fifth aspect of the present invention, in the configuration of the fourth aspect, the mounting table is provided along the peripheral surface of the cooking container, and includes a peripheral surface support portion that positions the cooking container in front, rear, left, and right, and a cooking container. The lower surface support part is provided along the lower surface and supports the cooking container from below, and the peripheral surface support part has a notch in a portion facing the arrangement range of the flame openings.

According to the first aspect of the present invention, the detour member for preventing the combustion exhaust generated in the grille from flowing directly to the temperature detecting means is provided on the mounting table of the cooking container, so that the temperature detecting means can be shortened. Increase in detection temperature over time can be suppressed. Therefore, even when a cooking container is used in an existing grill, combustion is not stopped in the middle of heating cooking, and usability is not impaired.
According to the second aspect of the present invention, in addition to the effect of the first aspect, the bypass member includes the vertical plate portion that is bent downward from the rear portion of the mounting table. The flow of the combustion exhaust generated from the gas burner that heats the side space can be guided in the left-right direction, and the direct flow to the temperature detecting means can be more effectively prevented.
According to the third aspect of the invention, in addition to the effect of the second aspect, at the lower end of the vertical plate portion, a lateral plate portion that protrudes rearward and is close to the rear inner surface of the grill cabinet is bent. Therefore, it is possible to effectively prevent the combustion exhaust from flowing down below the vertical plate portion, and to reliably guide the combustion exhaust to the left and right of the vertical plate portion.
According to the invention described in claim 4, in addition to the effect of claim 2 or 3, the mounting table is formed such that the dimension in the front-rear direction is longer than the arrangement range of the flame mouth, In the supported state, the intermediate portion on which the cooking container is placed is opposed to the arrangement range of the flame openings, so that the cooking container can be supported at an optimum position suitable for cooking.
According to the fifth aspect of the invention, in addition to the effect of the fourth aspect, the gas burner is provided with a notch in the portion facing the flame range in the peripheral surface support portion forming the mounting table. The cooking container can be directly heated without being cooled by the peripheral surface support portion. Therefore, efficient cooking is possible even using the mounting table.

It is a longitudinal cross-sectional view of the grill part of a built-in stove. It is a top view of the grill warehouse which abbreviate | omitted the upper casing. It is a disassembled perspective view which shows the support structure of the cooking container in a grill warehouse. It is a perspective view which shows the support state of the cooking container in a grill warehouse.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a grill portion in a built-in stove 1 with a grill, which is an example of a stove with a grill, and FIG. 2 is a plan view of a grill cabinet in which the upper casing 8 is omitted. The built-in stove 1 includes a stove portion 4 and 4 at the upper portion of a vessel 2 having a top plate 3, and a grill 5 at the center in the vessel body 2 between the stove portions 4 and 4. On the front panel (not shown) provided on the front side of the body 2 (the left side in FIGS. 1 and 2 is the front), a fire extinguishing button corresponding to each stove part 4 and grill 5, a thermal power adjustment, a cooking menu, and the like are provided. An operation unit (both not shown) for performing a selection operation is provided.

  The grill 5 includes a front grill cabinet 6 and an exhaust duct 7 connected to the rear portion of the grill cabinet 6, and is defined in the container 2 by an upper casing 8 and a lower casing 9 assembled from above and below. The upper casing 8 has a U-shape in a downward direction when viewed from the front and includes an upper plate and left and right upper plates of the grill cabinet 6 and an upper plate and left and right side plates of the exhaust duct 7. An upper burner 10 is provided as a combustion means with the facing downward. The lower casing 9 rises from the lower plate of the grill cabinet 6, the left and right lower plates, and the rear end of the lower plate, closes the rear lower side of the grill cabinet 6, and then extends rearward to become the bottom of the exhaust duct 7. It has a U-shape in front view with a plate 11, and on the left and right lower plates, flame ports 13, 13,... Extending in the front-rear direction toward the center side of the grill cabinet 6 are arranged in parallel at equal intervals. Lower burners 12 are provided as combustion means. Reference numerals 14 and 14 denote thermocouples installed on the inner sides of the rear portions of the left and right lower burners 12 with their heat sensitive parts facing forward.

The exhaust duct 7 is a horizontally long rectangular tube formed by a back plate 15 assembled to the upper and lower casings 8 and 9 from the rear and extending obliquely rearward. The upper end of the exhaust duct 7 is formed on the top plate 3 of the container 2. Connected to the exhaust port 16.
In addition, an inclined surface 17 that is lowered forward is formed at the center in the left-right direction of the rear plate 11 that forms the outlet from the grill cabinet 6, and the lower casing 9 penetrates the inclined surface 17 from below. Thus, a temperature sensor 18 (here, a thermistor) is provided as temperature detecting means for projecting the heat sensitive part 19 on the inclined surface 17. Reference numeral 20 denotes a sensor cover that is provided on the inclined surface 17 to protect the temperature sensor 18 from above and to allow the passage of combustion exhaust by opening front and rear.

On the other hand, a support frame 21 is provided at the bottom of the grill cabinet 6 so that it can be inserted and removed from the front. A grill base 22 and a juice tray 23 are provided on the support frame 21, respectively. With the loading and unloading, it is possible to load and unload from the grill cabinet 6 at the same time.
First, as shown in FIG. 3, the support frame 21 includes a metal frame 24 that is bent into a rectangular shape in plan view, and a front support plate that is fixed to both front and rear ends in the longitudinal direction within the frame 24. 25 and a rear support plate 26, and a grill door 27 is attached to the front support plate 25. The support frame 21 is guided to be slidable in the front-rear direction by rail-like support frame receivers 28 and 28 (FIG. 1) provided on the left and right sides of the bottom portion of the lower casing 9.

The grill base 22 has a frame shape formed by continuously bending a metal bar, and both front and rear ends in the longitudinal direction are placed on the front support plate 25 and the rear support plate 26 of the support frame 21, respectively. At both front and rear ends in the direction, convex-shaped receiving portions 29 and 29 projecting from the center are bent upward.
The soup pan 23 has a rectangular shape in plan view whose longitudinal dimension is smaller than the interval between the receiving portions 29 and 29 of the grill base 22, and a rectangular recess 30 in plan view that is slightly smaller than the outer shape is formed in the center. In addition, a flange 31 that extends outward is formed at the peripheral edge of the recess 30. The soup pan 23 is supported in a state of being placed on the grill base 22 by the recess 30 fitting into the grill base 22 and the flange portion 31 being locked.

And the grill net formed in a rectangular shape in a plan view by a metal bar on the grill base 22 is engaged with the left and right shoulders of the receiving portions 29 and 29 respectively by receiving both ends in the longitudinal direction. Although it can be mounted, a mounting table 32 for supporting the cooking container 50 in the grill cabinet 6 is provided instead of the grill.
The mounting table 32 is made of a metal bar formed in a rectangular shape in plan view, and has a lower surface support frame 33 as a lower surface support portion in which standing portions 34 and 34 are formed by bending the front and rear ends in the longitudinal direction upward. A plate-like front locking plate 35 and a rear locking plate 36 connected to the upright portions 34, 34 of the lower surface support frame 33, and the upper surfaces of both locking plates 35, 36, respectively. And a peripheral surface support frame 37 as a peripheral surface support portion made of a bar material.

The lower surface support frame 33 is formed at intervals that are smaller in the horizontal dimension than the width dimension of the cooking container 50 described later, and the cooking container 50 can be placed thereon. A pair of protrusions 38 are formed at the front end of the front locking plate 35 and the rear end of the rear locking plate 36, and the protrusions 38 are connected to both shoulders of the receiving portion 29 of the grill base 22. By being locked to the portion, it can be placed in a fashion that spans between the front and rear receiving portions 29, 29 as in the case of the grill.
Further, at the rear edge of the rear locking plate 36, a vertical plate portion 40 bent downward and a horizontal plate bent rearward from the lower end of the vertical plate portion 40 between the protrusions 38, 38. A detour member 39 having an L-shaped cross section composed of the portion 41 is integrally formed. Further, cover portions 42, 42 projecting outward are formed on the left and right sides of the rear portion of the rear locking plate 36.

  The peripheral surface support frame 37 is formed along the peripheral surface of the cooking container 50, but here, notches 43 and 43 are formed on both the left and right sides, and the front frame portion 44 and the rear frame portion 45 are divided. It has a shape. Since both left and right ends of both frame portions 44 and 45 are curved in accordance with the shape of the end portion of the cooking container 50, both frame portions 44 and 45 are in a state where the cooking container 50 is placed on the lower surface support frame 33. Are fitted in front and rear of the cooking container 50 so that the cooking container 50 can be positioned front and rear and left and right.

And the cooking container 50 consists of the box-shaped container main body 51 which opened the upper surface, and the cover body 52 which obstruct | occludes the opening of the container main body 51. As shown in FIG. The container main body 51 has a rectangular shape in plan view with four corners having an R shape and a bottom surface having a corrugated shape, and ears 53 are provided on both sides in the longitudinal direction. The ear portion 53 is formed with long through holes 54 at the front and rear. By engaging a handle (not shown) with the ear 53 and the through-hole 54, the cooking container 50 can be taken in and out.
The lid 52 has the same shape as the container main body 51 in a plan view and is a shallow box shape that is slightly smaller than the container main body 51 and opens the lower surface, and a vapor discharge hole 55 is formed on the upper surface. . Both the container main body 51 and the lid body 52 are made of iron.

In the built-in stove 1 configured as described above, the grill base 22 is first placed on the support frame 21 pulled out from the grill cabinet 6 so as to be aligned with positioning recesses (not shown) provided on the front and rear support plates 25 and 26. Thereafter, the soup pan 23 is placed above the so that the recess 30 fits into the grill base 22 between the receiving portions 29, 29. Then, as shown in FIG. 3, the juice receiving tray 30 is set on the support frame 21 in a state in which movement is restricted in the front-rear and left-right directions.
Next, when the mounting table 32 is locked with the protrusions 38 and 38 of the front and rear locking plates 35 and 36 to the shoulders of the receiving portions 29 and 29, respectively, the mounting table 32 is moved by the receiving portions 29 and 29 in the front-rear direction. Supported horizontally.

And if the cooking container 50 which accommodated to-be-cooked object is mounted between the surrounding surface support frames 37 on the lower surface support frame 33 of the mounting base 32, as shown in FIG. And it is supported horizontally above the support frame 21 via the grill base 22.
If the support frame 21 in which the cooking container 50 is set is housed in the grill cabinet 6, the cooking container 50 is supported at a height located between the upper and lower burners 10 and 12, as shown in FIGS. become. In this state, the detour member 39 of the rear locking plate 36 has the vertical plate portion 40 positioned in front of the inclined surface 17 of the exhaust duct 7 in front view and crossing the front of the temperature sensor 18, and the horizontal plate portion 41 being the inclined surface. It approaches the front end at a height that substantially matches the front end of 17. Further, the left and right cover portions 42, 42 are positioned to protrude upward slightly behind the thermocouples 14, 14 provided on the lower burners 12, 12.

At this time, the placing table 32 extends longer in the front-rear direction than the arrangement range (W shown in FIG. 1) of the flame outlets 13, 13... Of the lower burner 12, and becomes a central portion on which the cooking container 50 is placed. Only the lower surface support frame 33 faces the arrangement range W.
Further, the peripheral surface support frame 37 has a front frame portion 44 and a rear frame portion 45 separated before and after the arrangement range W, and the notches 43 and 43 are opposed to the arrangement range W. Therefore, the left and right side surfaces of the container main body 51 of the cooking container 50 face the arrangement range W of the flame outlets 13 without intervening anything.

Here, when the grill fire extinguishing button provided on the front panel is pressed, the gas flow path to the upper and lower burners 10 and 12 is opened and fuel gas is supplied, and a controller (not shown) activates the ignition electrode. The upper and lower burners 10, 12 are burned. Therefore, the cooking container 50 is heated from above and below by the flames of the upper and lower burners 10 and 12, and the cooking object accommodated therein is cooked.
Then, the combustion exhaust generated from the upper and lower burners 10, 12 moves to the rear part of the grill 6 and is discharged from the exhaust port 16 through the exhaust duct 7. At this time, the controller monitors the detected temperature obtained from the temperature sensor 18 provided in the exhaust duct 7 and can execute an overheat prevention function for stopping the combustion of the upper and lower burners 10 and 12 when a predetermined temperature is reached. .

  In this case, the combustion exhaust from the lower burner 12 tends to enter the exhaust duct 7 from below the rear locking plate 36 of the mounting table 32 as indicated by a dotted arrow in FIG. However, since a detour member 39 is formed at the rear end of the rear locking plate 36, the combustion exhaust comes into contact with the vertical plate portion 40 of the detour member 39 and is divided into left and right as shown by dotted arrows in FIG. Then, the air enters the exhaust duct 7 from the left and right in a manner that goes around the detour member 39. Therefore, the combustion exhaust does not flow directly toward the heat sensitive part 19 of the temperature sensor 18 on the inclined surface 17 and the temperature sensor 18 can be prevented from rising in a short time. , 12 will not be stopped.

  In particular, since the detour member 39 is also provided with the horizontal plate portion 41, it becomes difficult for the combustion exhaust to flow under the vertical plate portion 40, and the direct flow to the temperature sensor 18 is more effectively regulated. Further, since the rear locking plate 36 is provided so as to close the rear of the cooking vessel 50 and the bypass member 39 is provided at the rear end thereof, the rise of the combustion exhaust from the lower burner 12 is caused by the rear locking plate 36. It is blocked and easily comes into contact with the detour member 39. Therefore, the induction action of the combustion exhaust by the detour member 39 is effectively exhibited.

  On the other hand, the controller monitors the thermoelectromotive force of the thermocouples 14 and 14 heated by the combustion exhaust from the lower burner 12 to detect the disappearance, but here the combustion exhaust flowing backward is the thermocouple 14. Before passing into the exhaust duct 7, the flow is impeded by contact with the cover portion 42 provided on the rear locking plate 36 of the mounting table 32, and once stays below the rear locking plate 36. To the exhaust duct 7. Therefore, the thermocouple 14 is reliably heated by the combustion exhaust staying here, and the detection of the extinction can be accurately performed.

  Thus, according to the built-in stove 1 of the said form, the combustion exhaust which was located in the front part of the temperature sensor 18 in the state supported by the receiving parts 29 and 29 in the rear part of the mounting base 32, and generate | occur | produced in the grill cabinet 6 is carried out. By providing the detour member 39 that prevents direct flow to the temperature sensor 18, an increase in the detected temperature of the temperature sensor 18 in a short time can be suppressed. Therefore, even when the cooking container 50 is used with the existing grill 5, combustion is not stopped in the middle of heating cooking, and usability is not impaired.

In particular, here, since the bypass member 39 includes the vertical plate portion 40 that is bent downward from the rear locking plate 36 of the mounting table 32, the lower burner 12 that heats the lower space of the cooking vessel 50. It is possible to guide the flow of combustion exhaust generated from the left and right direction, and to more effectively prevent the direct flow to the temperature sensor 18.
Moreover, since the horizontal plate part 41 which protrudes back and adjoins to the inner surface of the rear part of the grill cabinet 6 is bent at the lower end of the vertical plate part 40, the combustion exhaust flows around to the lower side of the vertical plate part 40. This can be effectively prevented, and combustion exhaust can be reliably guided to the left and right of the vertical plate portion 40.

Furthermore, the cooking vessel 50 is placed in a state where the placing table 32 is formed such that the dimension in the front-rear direction is longer than the arrangement range W of the flame openings 13 and supported by the receiving portions 29, 29. Since the lower surface support frame 33 faces the arrangement range W, the cooking container 50 can be supported at an optimum position suitable for cooking.
In addition, the mounting table 32 is provided along the peripheral surface of the cooking container 50 and is provided along the peripheral surface support frame 37 for positioning the cooking container 50 in the front, rear, left, and right directions, and the lower surface of the cooking container 50 for cooking. The lower surface support frame 33 that supports the container 50 from below is formed, and the peripheral surface support frame 37 is provided with a notch 43 at a portion facing the arrangement range W, so that the flame from the lower burner 12 is exposed to the peripheral surface. The cooking container 50 can be directly heated without being cooled by the support frame 37. Therefore, efficient cooking is possible even when the mounting table 32 is used.

Note that the structure of the detour member is not limited to the above-described form, and can be appropriately changed as long as direct combustion exhaust flow to the temperature sensor can be prevented. For example, in the above embodiment, the bypass member is formed of the vertical plate portion and the horizontal plate portion, but the horizontal plate portion may be omitted and only the vertical plate portion may be provided. In this case, the vertical width of the vertical plate portion can be increased, and the vertical width is not made equal over the entire length of the left and right sides, but a downward semicircular or trapezoidal shape in which the central portion facing the temperature sensor extends downward. You can also. The cross-sectional shape is not limited to an L shape, and may be an arc shape or a linear shape.
The bypass member is not limited to the structure in which the bypass member is formed integrally with the mounting table, and the bypass member formed separately may be retrofitted to the mounting table with a screw or the like.
In addition, in the above embodiment, the temperature sensor is installed behind the boundary between the grille and the exhaust duct. It may be provided at the exit itself (boundary portion) as the vicinity of the exit.

On the other hand, the structure for supporting the mounting table is not limited to the above-described support frame and grill base, and the support frame is directly provided with a tray receiving portion, or a tray integrated with the support frame. As long as it has a receiving portion that can selectively support the grill and the mounting table, such as the one on which the grill table is mounted, the design of the support structure of the mounting table can be changed as appropriate.
The structure of the mounting table itself is also formed only by a metal bar like a grilled screen (in this case, the detour member is retrofitted), or the peripheral support frame is eliminated and cooking is performed on a front and rear integrated locking plate. A through hole into which the container is fitted can be formed. The cooking container is not limited to a rectangular shape in plan view, but may have other shapes as long as the plan view can be supported in the grill cabinet via a mounting table such as an oval shape or a circular shape.
In addition, although the said form demonstrated the built-in stove with a grill, this invention is applicable also to a table stove with a grill.

  1. · Built-in stove, 2 ·· Body, 4 ··· Hob, 5 ·· Grill, 6 ·· Grill cabinet, 7 ·· Exhaust duct, 8 ·· Upper casing, 9 ·· Lower casing, 10 ·· Upper burner, 11 ... Rear plate, 12 ... Lower burner, 13 ... Flame port, 14 ... Thermocouple, 17 ... Inclined surface, 18 ... Temperature sensor, 19 ... Heat sensitive part, 21 ... Support frame , 22 .. Grill base, 23.. Juice tray, 27. Grill door, 29. Rear locking plate, 37 .. Circumferential support frame, 39 .. Detour member, 40 .. Vertical plate portion, 41 .. Horizontal plate portion, 42 .. Cover portion, 43 .. Notch, 44. Part, 45 ... rear frame part, 50 ... cooking container, 51 ... container body, 52 ... lid, W ... flame range.

Claims (5)

A combustion chamber is provided with a grill for heating cooking, and temperature detection means for detecting the temperature of the combustion exhaust is provided near the outlet of the combustion exhaust provided at the rear of the grill storage. And a stove with a grill provided with front and rear receiving portions capable of selectively supporting a mounting table for mounting a cooking container in the grill cabinet,
A detour member, which is positioned in front of the temperature detection unit in a state of being supported by the receiving unit and prevents combustion exhaust generated in the grille from flowing directly to the temperature detection unit, is disposed at the rear of the mounting table. A stove with a grill characterized in that is provided.   The combustion means includes a gas burner that heats the lower space of the cooking container supported by the receiving portion via the mounting table, and the bypass member is bent downward from the rear portion of the mounting table. The stove with a grill according to claim 1, further comprising a vertical plate portion.   The stove with a grill according to claim 2, wherein a transverse plate portion that protrudes rearward and is close to a rear inner surface of the grill cabinet is bent at a lower end of the vertical plate portion.   The gas burner has a plurality of flame openings arranged side by side in the front-rear direction, and the mounting table is formed such that the front-rear direction dimension is longer than the arrangement range of the flame openings and is supported by the receiving portion. 4. The stove with a grill according to claim 2, wherein an intermediate portion on which the cooking container is placed is opposed to an arrangement range of the flame outlets in a state where the cooking container is placed.   The mounting table is provided along a peripheral surface of the cooking container, and is provided along a peripheral surface support portion for positioning the cooking container in the front, rear, left, and right directions, and is provided along a lower surface of the cooking container so as to lower the cooking container. The stove with a grill according to claim 4, further comprising a lower surface support portion supported from above, wherein the peripheral surface support portion has a notch in a portion facing the arrangement range of the flame ports.

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