JP2022139066A - heating cooker - Google Patents

Abstract

To provide a compact heating cooker.SOLUTION: A lower burner 55 has a convex flame hole unit 550 protruding in the inward direction. A first slope section 531 of the flame hole unit 550 has a plurality of slit-shaped downward flame holes 551, a second slope section 532 of the flame hole unit 550 has a plurality of slit-shaped upward flame holes 552, and a connecting section 535 connecting the first slope section 531 and the second slope section 532 has a slit-shaped middle flame hole 553 between the downward flame holes 551 and the upward flame holes 552. The downward flame holes 551, the upward flame holes 552, and the middle flame holes 553 are arranged so as not to be overlapped in a longitudinal direction. An upper end of the middle flame hole 553 is disposed above a lower end of the upward flame hole 552 adjacent to the middle flame hole 553, and a lower end of the middle flame hole 553 is disposed below an upper end of the downward flame hole 551 adjacent to the middle flame hole 553. Flames of the middle flame holes 553 are detected by flame detection means 340.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present invention relates to a heating cooker provided with a grill burner for heating the inside of a grill chamber.

A grill burner used for a grill of a heating cooker includes a main flame hole formed at a predetermined distance in the front-rear direction, and a flame holding hole continuous in a slit-like shape extending in the front-rear direction below the main flame hole. A proposal has been made to have (Patent Document 1). According to this grill burner, the flame from the flame-stabilizing holes is continuously formed in the entire front-rear direction of the grill burner, so that the flame spread from the flame-stabilizing holes to the main flame holes can be improved.

JP 2012-13327 A

By the way, in the limited space of the heating cooker, in order to increase the number of parts mounted in the heating cooker according to the enlargement of the grill chamber for storing the food to be cooked and the high functionality, the grill burner Miniaturization is required. However, if the size of the grill burner elongated in the front-rear direction as in Patent Document 1 is reduced, the distance between the main flame holes is shortened. Therefore, the flames formed in the main flame hole interfere with each other, and the flames are enlarged. As a result, the flame detection part of the flame detection means such as a thermocouple for detecting the flame of the grill burner must be installed at a position away from the main flame hole, and the grill burner unit including the flame detection part cannot be made compact. There is a problem.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a heating cooker equipped with a grill burner unit including a compact flame detector.

According to the invention,
a grill and
a pair of left and right grill burners arranged outside the left and right side walls of the grill chamber and ejecting combustion exhaust gas from the outside of the left and right side walls toward the inside of the grill chamber through inlets provided in the left and right side walls;
a flame detection means for detecting a flame of a grill burner,
A pair of left and right grill burners each have a flat burner body elongated in the front-rear direction of the grill chamber,
The burner body has an inner side wall portion located inside the grill chamber and an outer side wall portion located outside the grill chamber and facing the inner side wall portion with a gap at a predetermined location. and
The inner side wall portion has a ridge that is longitudinal in the front-rear direction and protrudes inward,
The ridge portion includes a first inclined surface portion that inclines obliquely upward and inward from below; a second inclined surface portion that is positioned above the first inclined surface portion and inclines obliquely upward and outward from below; It has a connecting portion that connects the first inclined surface portion and the second inclined surface portion,
In the first inclined surface portion, a plurality of downward flame holes are formed in the shape of slits that are elongated in the vertical direction and eject combustion exhaust obliquely downward,
In the second inclined surface portion, a plurality of upward flame holes are formed in the shape of slits that are elongated in the vertical direction and eject combustion exhaust obliquely upward,
A vertically long slit-like middle flame hole is formed in the connecting portion between the upward flame hole and the downward flame hole in the front-rear direction.
The downward flame hole, the upward flame hole, and the medium flame hole are arranged so as not to overlap in the front-rear direction,
The medium flame hole has its upper end positioned above the lower end of the upward flame hole adjacent to the medium flame hole, and the lower end of the medium flame hole positioned below the upper end of the downward flame hole adjacent to the medium flame hole. are positioned so that
A heating cooker is provided in which the flame detection means is configured to be capable of detecting a flame formed in the medium flame hole.

According to the above-described heating cooker, by arranging the upward flame hole, the downward flame hole, and the medium flame hole so as not to overlap in the front-rear direction, competition for secondary air between the burn holes is suppressed. , the secondary air can be sufficiently supplied to each flame hole, the flame formed in each flame hole can be shortened, and the interference of the flame formed in each flame hole can be suppressed, Enlargement of flame can be prevented. Also, the upper end of the medium flame hole is positioned higher than the lower end of the upward flame hole adjacent to the medium hole, and the lower end of the medium flame hole is positioned lower than the upper end of the downward flame hole adjacent to the medium hole. By arranging the upward flame hole, the downward flame hole, and the medium flame hole, the lift of the medium flame hole can be suppressed, the flame stability of the medium flame hole can be improved, and the flame spread property can be improved. can be improved. In addition, by forming the medium flame hole in the connecting portion, the root of the flame formed in the medium flame hole is heated by the upward flame hole and the downward flame hole, so the lift of the flame formed in the medium flame hole is further reduced. The flame detection means can be placed closer to the medium flame hole because the flame can be suppressed and the flame can be made shorter. As a result, the grill burner unit including the compact flame detector can be mounted on the cooking device.

Preferably, in the heating cooker,
The flame detection means has a flame detection portion facing the medium flame hole and a support body portion for supporting the flame detection portion,
The flame detecting means is arranged such that the supporting body portion extends from the flame detecting portion so as to face the first inclined surface portion having no downward flame hole or the second inclined surface portion having no upward flame hole. .

According to the above-described heating cooker, overheating of the supporting body portion of the flame detection means can be suppressed, and durability of the flame detection means can be reliably ensured even in a compact grill burner unit.

Preferably, in the heating cooker,
The connecting portion includes a first medium flame hole that is elongated in the vertical direction between the upward flame hole and the downward flame hole in the front-rear direction, and an upward flame hole in the front-rear direction that is different from the first medium flame hole. and a second medium flame hole opened in a vertically long slit shape between the downward flame hole,
The first medium hole and the second medium hole are such that the upper end of the first medium hole and the lower end of the upward-facing hole adjacent to the first medium hole overlap in the vertical direction to form the upper end of the second medium hole. and the lower end of the upward flame hole adjacent to the second medium flame hole, and the overlap in the vertical direction between the lower end of the first medium flame hole and the upper end of the downward flame hole adjacent to the first medium flame hole is less than the second formed so as to be smaller than the vertical overlap between the lower end of the second medium hole and the upper end of the downward pointing hole adjacent to the second medium hole;
The flame detection means is configured to be capable of detecting flame formed in the first medium hole.

According to the heating cooker, the second medium flame hole is a medium flame hole that emphasizes the spread of fire, and the first medium flame hole is a medium flame that emphasizes short flame so as to be suitable for flame detection by the flame detection means. It can be a hole.

Preferably, in the heating cooker,
The connecting portion has an inclination angle different from the inclination angles of the first inclined surface portion and the second inclined surface portion so as to form a substantially flat portion extending in the front-rear direction.

According to the above-described heating cooker, it is possible to secure the areas of the first inclined surface portion and the second inclined surface portion without increasing the amount of inward protrusion of the ridge portion. The inclination angle of the second inclined surface portion can be made small, and the combustion exhaust gas ejected from the upward flame hole and the downward flame hole can be efficiently divided vertically.

As described above, according to the present invention, it is possible to provide a cooker equipped with a grill burner unit including a compact flame detector.

FIG. 1 is a schematic perspective view showing an example of a heating cooker according to an embodiment of the invention. FIG. 2 is a schematic longitudinal sectional view showing an example of the heating cooker according to the embodiment of the invention. FIG. 3 is a schematic cross-sectional view showing an example of the heating cooker according to the embodiment of the invention. FIG. 4 is a schematic perspective view showing an example of a lower heat burner used in the heating cooker according to the embodiment of the present invention. FIG. 5 is a schematic plan view of a main part showing an example of a flame hole pattern of a lower flame burner used in the heating cooker according to the embodiment of the present invention. FIG. 6 is a schematic perspective view of essential parts showing the periphery of a lower heat burner used in the heating cooker according to the embodiment of the present invention. 7A and 7B are schematic cross-sectional views illustrating an example of the state of flames formed in the lower flame burner used in the heating cooker according to the embodiment of the present invention, and FIG. FIG. 7(b) shows a large flame overlap state and a small flame overlap state. FIG. 8 is a schematic perspective view of a main part showing another example of the lower heat burner used in the heating cooker according to the embodiment of the present invention. FIG. 9 is a schematic perspective view of a main part showing still another example of the lower heat burner used in the heating cooker according to the embodiment of the present invention.

Hereinafter, a heating cooker according to the present embodiment applied to a gas stove will be specifically described with reference to the drawings.
FIG. 1 is a schematic perspective view showing a gas stove according to this embodiment. As shown in FIG. 1, the heating cooker uses a plurality of stove burners 1 provided on the upper surface of a top plate 9 and a grill plate 80 serving as a cooking object placing means for placing an object to be cooked. and a grill 2 for performing Although not shown, a gridiron may be used instead of the grill plate 80 .

As shown in FIGS. 1 and 2, the grill 2 is mounted inside the stove main body 10 and covers a rectangular box-shaped grill chamber 20 that opens forward and a front opening 100 of the grill chamber 20 from the front. A grill door 5 is provided. A connecting plate 210 extends toward the interior of the grill chamber 20 below the rear surface of the grill door 5, and a support frame 220 that supports the grill plate 80 from below is connected to the connecting plate 210. As shown in FIG. As a result, by pulling the grill door 5 forward, the grill plate 80 is pulled forward of the grill chamber 20 together with the support frame 220, and by pushing the grill door 5 backward, the grill plate 80 is pulled out together with the support frame 220. It is configured to be housed within 20 . In this specification, the surface on which the grill door 5 is provided is defined as the front, and the direction in which the grill door 5 and the back side of the grill chamber 20 face each other when viewed from the grill door 5 side is referred to as the front-rear direction. The width direction of the grill 20 is called the horizontal direction, and the height direction of the grill chamber 20 is called the vertical direction.

An operation portion formed on the left side of the grill door 5 includes a grill switch 41 having both functions of turning on and extinguishing the upper and lower flame burners 56 and 55 and adjusting the heat power, and a kangaroo-type operation unit 40 below it. is provided. The operation unit 40 is configured to be tilted forward and operated by the user by pushing the front panel 401 below the operation section. Also, when the user closes the front panel 401 , the operation unit 40 is stored inside the stove main body 10 .

As shown in FIGS. 2 and 3, the top wall 24 of the grill chamber 20 is provided with a top burner 56 for heating the food to be cooked from above. The top flame burner 56 is, for example, a surface-combustion ceramic burner whose lower surface is composed of a ceramic plate, and a flame hole 56a is formed in the lower surface of the plate. Therefore, when fuel gas and primary air are supplied from a mixing pipe (not shown) and the top flame burner 56 is ignited, a flame of the fuel gas is formed on the lower surface of the plate, and its radiant heat and combustion exhaust are emitted. The light is radiated downward inside the grill chamber 20 . Although not shown, the flame hole 56a of the upper flame burner 56 faces an electrode portion of an ignition electrode for igniting the fuel gas and a flame detection portion of a thermocouple for detecting flame.

In lower regions of the left and right side walls 21 and 22 of the grill chamber 20, introduction ports 201 and 202 which are elongated in the front-rear direction are opened so that flame holes 550 of the below-described bottom burner 55 face from the outside. Outside the left and right side walls 21 and 22 of the grill chamber 20, a pair of left and right bottom burners 55 extending in the front-rear direction along the left and right side walls 21 and 22 are arranged. Therefore, in the present embodiment, the underfire burner 55 constitutes a grill burner. Each lower flame burner 55 has a burner body 500 of a flat, substantially rectangular shape elongated in the front-rear direction. The burner main body 500 is fixed to the grill chamber 20 in a posture in which the short sides stand substantially vertically. By arranging the flat lower flame burner 55 vertically in this manner, the width of the entire grill 2 in the left-right direction can be shortened, so that a grill burner unit including a compact flame detector can be manufactured. can be done. In addition, since the space in which the underfire burner 55 is provided can be reduced, even if the grill chamber 20 is of a large size, it is possible to suppress an increase in the size of the grill 2 . Since the left and right bottom fire burners 55 have the same configuration except that they are bilaterally symmetrical, the configuration of the bottom fire burner 55 and its surroundings will be described by taking the right bottom fire burner 55 as an example.

The burner body 500 of the lower flame burner 55 is formed by, for example, drawing or pressing two flat metal plates punched into a predetermined shape, and punching one of the metal plates to form a flame hole. It is manufactured by applying processing, overlapping two metal plates so as to face each other with a gap at a predetermined location, and welding or crimping the peripheral edges to join them. Therefore, in this embodiment, when the bottom burner 55 is installed on the outside of the right side wall 22, one of the metal plates located on the inner side constitutes the inner side wall portion 501 of the burner main body 500, The other metal plate located on the side constitutes the outer side wall portion 502 of the burner body 500 . The burner main body 500 may be manufactured by bending a single metal plate processed into a predetermined shape into a palm-to-palm state along a bending line that serves as the upper edge or the lower edge of the burner main body 500 .

As shown in FIGS. 4 and 5, the inner side wall portion 501 bulges inward in a substantially semicircular shape in cross section from the rear end portion to the front-rear center portion in the vertical center portion. It has an inward bulging portion 510 that bulges inward to the vicinity of the front end portion in a substantially horizontal V shape in cross section in the left-right direction. The inner side wall portion 501 also has an inner flange portion 511 extending vertically and forward from the peripheral edge of the inner bulging portion 510 . Therefore, the portion of the inward bulging portion 510 that bulges out in a substantially horizontal V-shape in cross section is a lower slanted surface portion 531 (first slanted surface portion) that inclines obliquely upward and inward from below. , an upper inclined surface portion 532 (second inclined surface portion) located above the lower inclined surface portion 531 and inclined obliquely upward and outward from below, and a connecting portion 535 connecting the lower inclined surface portion 531 and the upper inclined surface portion 532 It is configured. In the lower inclined surface portion 531 and the upper inclined surface portion 532, a downward flame hole 551 and an upward flame hole 552, which will be described later, are formed in a vertically elongated slit shape. is opened in the form of a longitudinal slit in the vertical direction. Accordingly, in the present embodiment, the lower inclined surface portion 531, the upper inclined surface portion 532, and the connecting portion 535 form an inwardly protruding ridge portion constituting the flame hole portion 550. As shown in FIG.

As shown in FIGS. 3 and 6, the outer side wall portion 502 has an outward bulging portion that bulges outward in a substantially semicircular shape in cross-section in the left-right direction from the rear end to the vicinity of the front end in the vertical center. It has an outlet 520 . In addition, the outer side wall portion 502 has an outer flange portion 521 extending vertically and forward from the peripheral edge of the outer bulging portion 520 . The outer bulging portion 520 and the outer flange portion 521 are formed in a state in which the inner side wall portion 501 and the outer side wall portion 502 are overlapped with each other. It is formed at a position facing the portion 511 . In addition, the outer flange portion 521 is formed to be slightly larger vertically and forwardly than the inner flange portion 511, and a plurality of bent pieces 522 are formed on the peripheral edge of the outer side wall portion 502 (Fig. 4 and Figure 5). Therefore, in a state in which the inner side wall portion 501 and the outer side wall portion 502 are overlapped, the bending piece 522 on the peripheral edge of the outer side wall portion 502 is bent inward, and the peripheral edge of the inner side wall portion 501 is embraced. By caulking, the inner side wall portion 501 and the outer side wall portion 502 are integrally joined. A notch 523 is formed between the bending pieces 522 adjacent in the front and rear (see FIGS. 4 and 5). Claw pieces 330 and 370 of an electrode fixing member 320 and a thermocouple fixing member 360, which will be described later, are engaged with these notches 523. As shown in FIG.

When the inner side wall portion 501 and the outer side wall portion 502 are opposed to each other and joined together, the inner side wall portion 501 and the outer side wall portion 502 are joined by the inner side wall portion 510 and the outer side wall portion 520 . They face each other with an air gap between them. The inner flange portion 511 and the outer flange portion 521 are in surface contact with each other except for the bulging portion, and their peripheral edges are closed ends. As a result, the inward bulging portion 510 and the outward bulging portion 520 form a gas introduction port 509 opening rearward at the rear end portion.

A nozzle (not shown) for supplying fuel gas is inserted into the gas inlet 509 . The opening area of the gas introduction port 509 is formed sufficiently larger than that of the tip opening of the nozzle, and external air is supplied to the bottom burner 55 as primary air together with the fuel gas jetted from the nozzle. Therefore, when the fuel gas is introduced into the burner main body 500 through the gas inlet 509 , a substantially straight gas line is formed in the burner main body 500 that guides the air-fuel mixture supplied through the gas inlet 509 to the flame hole portion 550 . A passageway is defined.

Two downward flame holes 560 and 570 having a plurality of downward flame holes 551 are formed in the lower inclined surface portion 531 . Two upward flame holes 580 having a plurality of upward flame holes 552 are formed in the upper inclined surface portion 532 . The two downward burner holes 560 and 570 and the two upward burner holes 580 are alternately arranged vertically and forwardly. Further, a flame holding portion 590 having a medium flame hole 553 is formed in each of the connecting portions 535 between the upward flame hole portion 580 and the downward flame hole portions 560 and 570 . That is, in the present embodiment, the burner holes 550 include two upward burner holes 580 formed apart from each other in the vicinity of the rear end and the front end of the upper inclined surface portion 532 and two upward burner holes 580 . A downward burner hole portion 560 formed in the front-rear central portion of the lower inclined surface portion 531 between and an auxiliary downward burner hole portion 570 formed at the front end portion of the lower inclined surface portion 531 (hereinafter collectively referred to simply as " and a flame stabilizing portion 590 formed between the upward flame hole portion 580 and the downward flame hole portion 560 in the longitudinal direction. It should be noted that the auxiliary downward flame hole portion 570 is preferably formed when flame detection is performed with a medium flame hole 553 near the front end portion of the flame hole portion 550 as will be described later.

The downward burn hole portion 560 has a plurality (here, seven groups) of downward burn hole groups 561 in which a plurality (here, two or three) of downward burn holes 551 are arranged side by side at a predetermined interval Pd. The interval Pd between the adjacent downward burner holes 551 included in one downward burner hole group 561 is formed substantially the same as that of the adjacent downward burner holes 551 included in the other downward burner hole group 561 . In addition, the distance Gd between the downward burner hole groups 561 adjacent in the front-rear direction in the downward burner hole portion 560 is set to be substantially the same. Also, the distance Gd between the downward burner hole groups 561 adjacent in the front-rear direction is set larger than the interval Pd between the downward burner holes 551 included in each of the adjacent downward burner hole groups 561 . As a result, flame interference between the adjacent downward flame hole groups 561 can be suppressed, and enlarging of the flame can be prevented. Further, the auxiliary downward burner hole portion 570 has one downward burner hole group 561 in which a plurality of (here, two) downward burner holes 551 are arranged side by side at a predetermined interval Pd.

Each of the two upward burner holes 580 has a plurality (here, three groups) of upward burner holes 581 in which a plurality of (here, two or three) upward burner holes 552 are arranged side by side at a predetermined interval Pu. have The interval Pu between adjacent upward burner holes 552 included in one upward burner hole group 581 is set substantially the same as that between adjacent upward burner holes 552 included in another upward burner hole group 581 . In addition, the distances Gu between groups of upward burner holes 581 adjacent in the front-rear direction in one upward burner hole portion 580 are set to be substantially the same. Also, the distance Gu between the upward burner hole groups 581 that are adjacent in the longitudinal direction is set larger than the interval Pu between the adjacent upward burner holes 552 included in each of the adjacent upward burner hole groups 581 . As a result, it is possible to suppress the flame interference between the adjacent upward burner hole groups 581, and prevent the flame from being enlarged.

The number of downward burn holes 551 included in one downward burn hole group 561 and the number of upward burn holes 552 included in one upward burn hole group 581 are preferably 2 or more and 5 or less, respectively. Preferably, it is 2 or more and 4 or less. If the number of flame holes is two or more, it is possible to form a flame having a uniform size in the front-rear direction. Also, if the number of flame holes is 5 or less, it is possible to suppress flame interference in one downward flame hole group 561 and one upward flame hole group 581, and to prevent flame enlargement.

The size of the interval Pd between the adjacent downward burner holes 551 in each downward burner hole group 561 and the size of the interval Pu between the adjacent upward burner holes 552 in each upward burner hole group 581 depend on the size of the grill chamber 20 and the lower flame burner corresponding thereto. 55, but if both flame interference and flame spread are taken into account, both the downward burn hole group 561 and the upward burn hole group 581 are preferably 1 mm or more and 1 mm or more. .5 mm or less. For the same reason, both the distance Gd between adjacent downward burn hole groups 561 and the distance Gu between adjacent upward burn hole groups 581 are preferably 2.8 mm or more and 3.2 mm or less. The interval Pd between the adjacent downward burner holes 551 and the distance Gd between the adjacent downward burner hole groups 561 may be the same as or different from those in the upward burner hole portion 580, respectively. The length of the long side in the vertical direction of each slit of the downward flame hole 551 and the upward flame hole 552 is preferably 2.8 mm or more and 3.5 mm or less, and the length of the short side in the front-rear direction is preferably , 0.5 mm or more and 0.7 mm or less, and the long side/short side ratio is preferably 4 or more and 7 or less.

The number of downward firing hole groups 561 included in the downward firing hole portion 560 is preferably 3 groups or more and 10 groups or less, more preferably 3 groups or more and 7 groups or less. If the number of the flame hole groups is three or more, it is possible to form a uniform downward flame in the flame hole portion 550 . If the number of flame hole groups is 10 or less, it is possible to suppress flame interference between the adjacent downward flame hole groups 561 of the downward flame hole portion 560, and to prevent flame enlargement. In addition, in order to eject more downward combustion exhaust from the burner hole portion 550 to the lower side of the grill plate 80, the downward burner hole group 561 in the downward burner hole portion 560 is preferably equal to the upward burner hole group in the adjacent upward burner hole portion 580. More than 581 are formed. When the auxiliary downward burner hole portion 570 is provided, the number of the downward burner hole groups 561 included in the auxiliary downward burner hole portion 570 is preferably one group or more and two groups or less.

The number of upward burner hole groups 581 included in one upward burner hole portion 580 is preferably one group or more and five groups or less, more preferably two groups or more and three groups or less. If the number of flame hole groups is one or more, it is possible to form a uniform upward flame in the flame hole portion 550 . If the number of flame hole groups is five or less, flame interference between the adjacent upward flame hole groups 581 of the upward flame hole portion 580 can be suppressed, and enlargement of the flame can be prevented.

Each of the three flame stabilizing portions 590 preferably has one or more and three or less medium flame holes 553 . The interval between adjacent medium flame holes 553 and downward flame holes 551 or upward flame holes 552 is set substantially equal to the interval Pd between adjacent downward flame holes 551 or the interval Pu between adjacent upward flame holes 552 . As a result, the flame can smoothly spread between the upward flame hole portion 580 and the downward flame hole portion 560 and the like. When each flame stabilizing portion 590 has two or more medium flame holes 553 , the spacing between adjacent medium flame holes 553 may be the same as or different from that of adjacent upward flame holes 552 or adjacent downward flame holes 551 . The length of the long side in the vertical direction of the slit of the medium flame hole 553 is preferably 2.5 mm or more and 3 mm or less, and the length of the short side in the front-rear direction is preferably 0.5 mm or more and 0.5 mm or more. It is 7 mm or less, and the long side/short side ratio is preferably 3.5 or more and 6 or less.

The upper end of the medium flame hole 553 extends beyond the connecting portion 535 to the lower end of the upper inclined surface portion 532 , and the lower end of the medium flame hole 553 extends beyond the connecting portion 535 to the upper end of the lower inclined surface portion 531 . In addition, in the central portion of the flame hole portion 550 , the upward flame hole 552 located at the boundary between the upward flame hole portion 580 and the downward flame hole portion 560 extends beyond the lower end of the upper inclined surface portion 532 to the connecting portion 535 . A downward burner hole 551 located at the boundary between the upward burner hole portion 580 and the downward burner hole portion 560 extends beyond the upper end of the lower inclined surface portion 531 to the connecting portion 535 . For this reason, the flame formed in the upward flame hole 552 and the flame formed in the downward flame hole 551 positioned at the boundary between the upward flame hole portion 580 and the downward flame hole portion 560 are respectively adjacent medium flame holes (second flame holes). It is formed so as to overlap with the flame formed in the medium flame hole 553 when viewed from the front.

On the other hand, at the front end of the flame hole portion 550 , the upward flame hole 552 positioned at the boundary between the upward flame hole portion 580 and the auxiliary downward flame hole portion 570 has a lower end that is the upper end of a medium flame hole (first medium flame hole) 553 . It is formed so that the lower end is located above the connecting portion 535 although it is lower than the connecting portion 535 . Further, the downward flame hole 551 positioned at the boundary between the upward flame hole portion 580 and the auxiliary downward flame hole portion 570 has an upper end higher than the lower end of the medium flame hole (first medium flame hole) 553, but the upper end It is formed so as to be located below the connecting portion 535 . For this reason, the lower end of the upward flame hole 552 and the upper end of the medium flame hole (first medium flame hole) 553 at the front end of the flame hole portion 550 overlap in the vertical direction, and the upper end of the downward flame hole 551 and the medium flame hole (second flame hole) overlap in the vertical direction. The vertical overlap with the lower end of the 1 medium flame hole 553 is set to be smaller than those at the front and rear central portions of the flame hole portion 550 . As a result, the flames formed in the upward flame hole 552 and the flame formed in the downward flame hole 551 positioned at the boundary between the upward flame hole portion 580 and the auxiliary downward flame hole portion 570 are separated from each other by the adjacent medium flame hole (second flame hole). 1 medium flame hole) 553 and the flame formed so as to overlap less when viewed from the front.

An ignition electrode 300 is installed on the rear end side of the bottom burner 55 . The electrode portion 301 , which is the tip portion of the ignition electrode 300 , faces one upward flame hole (ignition flame hole) 552 of the upward flame hole portion 580 located near the rear end of the flame hole portion 550 . An electrode body portion 302 of the ignition electrode 300 extends obliquely upward and rearward from the electrode portion 301 . As a result, when viewed from the inside, the electrode body 302 does not overlap not only the downward flame hole 551 but also the upward flame hole 552, so that the electrode body 302 is not burned by the flame, and the ignition electrode 300 deteriorates. can be prevented. When spark discharge is generated from the ignition electrode 300 in the air-fuel mixture blown out from the upward flame hole 552, which is a flame hole for ignition, the air-fuel mixture is ignited, and the flame generated by the ignition is blown out from the other flame holes 551, 552, 553. By the spread of fire, the underfire burner 55 is in a burning state.

The ignition electrode 300 is attached to an electrode fixing member 320 that is screwed to an installation portion (not shown) provided on the periphery of the inlet 202 of the right side wall 22 . The electrode fixing member 320 is manufactured, for example, by bending a metal plate into a predetermined shape. The electrode fixing member 320 has a substantially U-shaped cross-section in the left-right direction, and includes a restriction portion 321 extending in the front-rear direction, an upper attachment piece 322 extending by bending upward from the inner upper end portion of the restriction portion 321 , and a restriction portion. A lower attachment piece 323 extending bent downward from the inner lower end of the portion 321; It has a substantially L-shaped fixed piece 325 that bends inward from the rear end portion of the upper edge of the installation piece 322 and further bends upward.

The electrode fixing member 320 is arranged such that the restricting portion 321 covers a portion of the rear end side of the outward swelling portion 520 of the outer side wall portion 502 at a predetermined distance from the outer side. The upper attachment piece 322 and the lower attachment piece 323 are substantially in contact with the outer surface of the outer flange portion 521 of the outer side wall portion 502 , and the upper edge of the upper attachment piece 322 and the bottom of the lower attachment piece 323 are in contact with each other. Each edge is provided with a plurality of claw pieces 330 that are bent inward. These claw pieces 330 are provided at positions corresponding to the notches 523 provided between the bent pieces 522 on the peripheral edge of the outer side wall portion 502 described above. Therefore, the electrode fixing member 320 is attached to the lower burner 55 by bending the claw piece 330 inward at the notch 523 and crimping the upper and lower peripheral edges of the outer side wall portion 502 and the inner side wall portion 501 . joined together. The mounting piece 324 is provided with a fitting portion 326 into which the rod-shaped electrode body portion 302 is fitted. The fixing piece 325 has a screw insertion hole for screw fixing the electrode fixing member 320 to the installation portion.

A thermocouple 340 serving as a flame detection means is installed on the front end side of the lower flame burner 55 . A flame detection portion 341 that is the tip portion of the thermocouple 340 faces one medium flame hole (first medium flame hole) 553 located near the front end portion of the flame hole portion 550 . A supporting body portion 342 of the thermocouple 340 extends obliquely downward and rearward from the flame detecting portion 341 in a posture facing the downward inclined surface portion 531 in which the downward flame hole 551 is not formed. Therefore, when viewed from the inside, the support body portion 342 of the thermocouple 340 does not overlap with either the upward flame hole 552 or the downward flame hole 551. deterioration can be prevented. Note that the thermocouple 340 may be arranged so that the support body portion 342 extends obliquely upward and rearward from the flame detection portion 341 in a posture facing the upper inclined surface portion 532 in which the upward flame hole 552 is not formed. .

The thermocouple 340 is attached to a thermocouple fixing member 360 that is screwed to an installation portion provided on the periphery of the introduction port 202 of the right side wall 22 . The thermocouple fixing member 360 is manufactured, for example, by bending a metal plate into a predetermined shape. The thermocouple fixing member 360 has a substantially U-shaped cross-section in the left-right direction, and includes a limiting portion 361 extending in the front-rear direction, an upper attachment piece 362 bending upward from the inner upper end portion of the limiting portion 361 and extending, A lower attachment piece 363 that bends and extends downward from the inner lower end of the restricting portion 361, and a lower edge of the lower attachment piece 363 that is bent inward from the front-rear central portion and further downward. It has an attachment piece 364 that bends and extends, and a substantially L-shaped fixing piece 365 that bends inward from the front end of the restricting portion 361 and further bends and extends forward.

A limiting portion 361 , an upper attachment piece 362 , and a lower attachment piece 363 of the thermocouple fixing member 360 have the same configurations as those of the electrode fixing member 320 . For this reason, the claw pieces 370 provided at the upper edge of the upper attachment piece 362 and the lower edge of the lower attachment piece 363 of the thermocouple fixing member 360 are bent inward at the cutouts 523, so that the outer side wall portion 502 and the outer side wall portion 502 and the outer side wall portion 502 The thermocouple fixing member 360 is integrally joined to the bottom burner 55 by crimping the upper and lower peripheral edges of the inner side wall portion 501 . The attachment piece 364 includes a first attachment piece extending horizontally inward from the lower edge of the lower attachment piece 363 and a second attachment piece extending bent downward from the inner end of the first attachment piece. and The first attachment piece is provided with an insertion hole through which the support body portion 342 of the thermocouple 340 is inserted, and the second attachment piece is engaged with a locking piece 371 that presses the support body portion 342 against the second attachment piece. A locking notch is provided for locking. The fixing piece 365 has a screw insertion hole for screw fixing the thermocouple fixing member 360 to the installation portion.

When the electrode fixing member 320 and the thermocouple fixing member 360 are joined to the bottom burner 55, the restricting portions 321 and 361 of the electrode fixing member 320 and the thermocouple fixing member 360 are arranged so that the upward flames are set. It is located on the outer side of the hole portion 580 and is spaced apart by a predetermined distance in the front-rear direction so as not to overlap the downward flame hole portion 560 . Therefore, the gap between the electrode fixing member 320 and the thermocouple fixing member 360 in the front-rear direction is located on the outer side of the downward burner hole portion 560 .

Returning to FIGS. 1 and 2, an exhaust opening 11 communicating with an exhaust passage 31 is formed in the rear upper portion of the grill chamber 20 . An exhaust duct 30 is connected to the rear wall 25 of the grill chamber 20 and forms an exhaust passage 31 .

The grill plate 80 is made of a molded or cast aluminum body having excellent heat conductivity, and the upper surface of the grill plate 80 is surface-treated with a fluorine resin or the like. The grill plate 80 has a substantially rectangular shape in plan view. A food placement portion 85 having unevenness is provided on the upper surface of the grill plate 80 . Side walls 83 are provided on both left and right ends of the grill plate 80 so as to extend obliquely upward and outward from the outer left and right ends of the food placement portion 85 . The left and right side walls 83 are connected at the front and rear ends of the grill plate 80 . The grill plate 80 is supported by the support frame 220 so that when the grill plate 80 is housed in the grill chamber 20 , the left and right side walls 83 face the flame holes 550 of the bottom burner 55 through the introduction ports 201 and 202 . supported from below.

As shown in FIGS. 3 and 6, on the outside of the right side wall 22 of the grill chamber 20, the whole bottom burner 55 is covered with a predetermined distance from the upper, front and outer sides, and is opened downward and rearward. A cover 600 having a substantially inverted L shape in cross section in the left-right direction is arranged. The cover 600 includes an upper wall portion 601 extending outward from the outer surface of the right side wall 22 above the inlet 202, an outer wall portion 602 extending downward from the outer end of the upper wall portion 601, and an outer wall portion and a front wall portion 603 that bends inwardly and extends from the front end of 602 . Therefore, when the lower flame burner 55 is burned, the air H in the gas stove is introduced into the cover 600 mainly through the opening below the cover 600 due to the draft effect. A secondary air passageway is formed that flows upwardly toward the inlet 202 .

The bottom burner 55 and the cover 600 are such that when the bottom burner 55 is covered with the cover 600, the outer surface of the limiting portion 321 of the electrode fixing member 320 and the outer surface of the limiting portion 361 of the thermocouple fixing member 360 are It is arranged so as to substantially contact the inner surface of the outer wall portion 602 of the cover 600 . Therefore, as shown in FIG. 6, part of the air H introduced into the cover 600 from below flows upward through the gap between the restricting portions 321 and 361, and the bottom burner 55 It flows through the top toward the inlet 202 on the inner side. On the other hand, as shown in FIG. 4, no upward burner hole portion 580 is formed in the upper inclined surface portion 532 of the burner hole portion 550 corresponding to the position where the gap between the restricting portions 321 and 361 is provided. The air that has flowed above the fire burner 55 flows downward and inward along the upper inclined surface portion 532 . Since the downward flame hole portion 560 is formed on the inner side of the gap between the restricting portions 321 and 361 , the amount of secondary light emitted from above is collected in the plurality of downward flame holes 551 of the downward flame hole portion 560 . Air is supplied.

According to the present embodiment, the downward flame hole 551, the upward flame hole 552, and the medium flame hole 553 are all formed in a slit shape elongated in the vertical direction. The flame can be shortened. In addition, the flame hole portion 550 is composed of a convex streak portion that is elongated in the front-rear direction and protrudes inward. Since the flame holes 551 and a plurality of upward flame holes 552 are arranged side by side, the air-fuel mixture is ejected slightly downward from the horizontal from the downward flame holes 551, and the air-fuel mixture is ejected slightly upward from the horizontal from the upward flame holes 552. is ejected. Therefore, a flame is formed obliquely downward in the downward flame hole 551 , and a flame is formed obliquely upward in the upward flame hole 552 . Since the downward flame hole 551, the upward flame hole 552, and the medium flame hole 553 are arranged so as not to overlap in the front-rear direction, competition for secondary air among the flame holes is suppressed. Secondary air can be sufficiently supplied to the flame holes, the flame formed in each flame hole can be shortened, and the interference of the flame formed in each flame hole can be suppressed. In addition, since the medium flame hole 553 is formed in the connecting portion 535 between the upward flame hole 552 and the downward flame hole 551 in the front-rear direction, the base of the flame formed in the medium flame hole 553 is the upward flame hole 552. and the flame formed by the downward flame hole 551, the lift of the flame formed by the medium flame hole 553 can be further suppressed, and the flame can be shortened.

In addition, an upward flame hole 552 or a downward flame hole 551 is formed adjacent to the front and rear of the medium flame hole 553. The lower end of the medium flame hole 553 is positioned below the upper end of the downward flame hole 551 adjacent in the front-rear direction. In particular, the medium flame hole (second medium flame hole) 553 positioned between the upward flame hole portion 580 and the downward flame hole portion 560 includes the medium flame hole 553, the upward flame hole 552 adjacent to the medium flame hole 553, and the The vertical overlap with the downward flame hole 551 is set large. Therefore, as shown in FIG. 7A, the flame formed in the medium flame hole (second medium flame hole) 553 and the flames formed in the adjacent upward flame hole 552 and downward flame hole 551 are forward. They are formed so that they overlap greatly when viewed. As a result, since the upper and lower ends of the medium flame hole 553 are heated by the flames of the upward flame hole 552 and the downward flame hole 551, the lift of the flame formed in the medium flame hole 553 is prevented, thereby improving flame stability. be able to.

Also, the upper and lower ends of the medium flame hole (first medium flame hole) 553 facing the flame detection portion 341 of the thermocouple 340 and the lower end of the upward flame hole 552 and the upper end of the downward flame hole 551 adjacent thereto. overlap in the vertical direction between the upper end and the lower end of another medium flame hole (second medium flame hole) 553 of the flame hole portion 550 and the lower end of the upward flame hole 552 and the upper end of the downward flame hole 551 adjacent thereto. is set smaller than the overlap of Therefore, as shown in FIG. 7B, the flame formed in the medium flame hole (first medium flame hole) 553 and the flame formed in the adjacent upward flame hole 552 and downward flame hole 551 The overlap is greater than the overlap between the flame formed in the medium flame hole (second medium flame hole) 553 shown in FIG. become smaller. Therefore, flame interference is further suppressed. In this way, by setting a smaller vertical overlap between the medium flame hole 553 facing the flame detector 341 of the thermocouple 340 and the adjacent upward flame hole 552 and downward flame hole 551, the lift of the flame is reduced. While preventing this, it is possible to prevent oxygen deficiency in the flame formed in the medium flame hole 553, and to further suppress enlargement of the flame. Thereby, the thermocouple 340 can be brought closer to the medium flame hole (first medium flame hole) 553 . Further, the other medium flame hole (second medium flame hole) 553 can ensure high flame spreadability.

As described above, according to the present embodiment, even when the bottom burner 55 is downsized, the flame formed in the bottom flame burner 55 can be shortened, and excellent flame stability and flame spread can be achieved. Since the flame detector 341 of the thermocouple 340 can be brought closer to the medium flame hole 553, it is possible to provide a cooker equipped with a grill burner unit including a compact flame detector.

FIG. 8 is a schematic perspective view of essential parts around a burner port, showing another example of the bottom burner according to the present embodiment. As shown in FIG. 8, in this lower burner 55C, the flame hole portion 550a is positioned between the lower inclined surface portion 531a and the upper inclined surface portion 532a at an inclination angle different from the inclination angles of the lower inclined surface portion 531a and the upper inclined surface portion 532a. It has the same configuration as the bottom burner 55 described above, except that it has a connecting portion 535a which is a substantially flat portion extending in the front-rear direction. By forming such connecting portion 535a of the planar portion, it is possible to secure the areas of the lower inclined surface portion 531a and the upper inclined surface portion 532a without increasing the inward protrusion amount of the ridge portion. Therefore, the inclination angles of the lower inclined surface portion 531a and the upper inclined surface portion 532a can be reduced, and the combustion exhaust gas ejected from the downward flame hole 551 and the upward flame hole 552 can be efficiently divided vertically. Note that the connecting portion 535a may have a curved surface as well as a flat surface.

FIG. 9 is a schematic perspective view of the main part around the burner port showing still another example of the bottom burner according to the present embodiment. As shown in FIG. 9, the lower flame hole 553b has an upper end extending to the vertical center of the upper inclined surface portion 532a, and a lower end of the intermediate flame hole 553b extending to the upper and lower central portion of the lower inclined surface portion 531a. It has the same configuration as the bottom burner 55C described above, except that it is provided.

(Other embodiments)
(1) In the above embodiment, the flat bottom-fire burner is arranged vertically. However, according to the present invention, the flat underfire burner may be arranged horizontally.

(2) In the above embodiment, the grill plate is used as the cooking object placing means. However, the present invention may use other cooking containers that are indirectly heated (heat-conducted) by a grill burner as the cooking object placing means.

(3) In the above embodiment, an upward burner hole portion having a plurality of upward burner holes, one medium burner hole, and a downward burner hole portion having a plurality of downward burner holes are arranged side by side. However, according to the present invention, the upward flame holes, the medium flame holes, and the downward flame holes may be alternately arranged side by side.

20 grill chamber 55 lower flame burner 531 lower inclined surface portion 532 upper inclined surface portion 535 connecting portion 550 flame hole portion 551 downward flame hole 552 upward flame hole 553 middle flame hole 340 thermocouple

Claims (4)

a grill and
a pair of left and right grill burners arranged outside the left and right side walls of the grill chamber and ejecting combustion exhaust gas from the outside of the left and right side walls toward the inside of the grill chamber through inlets provided in the left and right side walls;
a flame detection means for detecting a flame of a grill burner,
A pair of left and right grill burners each have a flat burner body elongated in the front-rear direction of the grill chamber,
The burner body has an inner side wall portion located inside the grill chamber and an outer side wall portion located outside the grill chamber and facing the inner side wall portion with a gap at a predetermined location. and
The inner side wall portion has a ridge that is longitudinal in the front-rear direction and protrudes inward,
The ridge portion includes a first inclined surface portion that inclines obliquely upward and inward from below; a second inclined surface portion that is positioned above the first inclined surface portion and inclines obliquely upward and outward from below; It has a connecting portion that connects the first inclined surface portion and the second inclined surface portion,
In the first inclined surface portion, a plurality of downward flame holes are formed in the shape of slits that are elongated in the vertical direction and eject combustion exhaust obliquely downward,
In the second inclined surface portion, a plurality of upward flame holes are formed in the shape of slits that are elongated in the vertical direction and eject combustion exhaust obliquely upward,
A vertically long slit-like middle flame hole is formed in the connecting portion between the upward flame hole and the downward flame hole in the front-rear direction.
The downward flame hole, the upward flame hole, and the medium flame hole are arranged so as not to overlap in the front-rear direction,
The medium flame hole has its upper end positioned above the lower end of the upward flame hole adjacent to the medium flame hole, and the lower end of the medium flame hole positioned below the upper end of the downward flame hole adjacent to the medium flame hole. are positioned so that
The heating cooker, wherein the flame detection means is configured to be capable of detecting a flame formed in the medium flame hole. In the heating cooker according to claim 1,
The flame detection means has a flame detection portion facing the medium flame hole and a support body portion for supporting the flame detection portion,
The flame detecting means is arranged so that the supporting body extends from the flame detecting portion in a posture facing the first inclined surface portion having no downward flame hole or the second inclined surface portion having no upward flame hole. heating cooker. In the heating cooker according to claim 1 or 2,
The connecting portion includes a first medium flame hole that is elongated in the vertical direction between the upward flame hole and the downward flame hole in the front-rear direction, and an upward flame hole in the front-rear direction that is different from the first medium flame hole. and a second medium flame hole opened in a vertically long slit shape between the downward flame hole,
The first medium hole and the second medium hole are such that the upper end of the first medium hole and the lower end of the upward-facing hole adjacent to the first medium hole overlap in the vertical direction to form the upper end of the second medium hole. and the lower end of the upward flame hole adjacent to the second medium flame hole, and the overlap in the vertical direction between the lower end of the first medium flame hole and the upper end of the downward flame hole adjacent to the first medium flame hole is less than the second formed so as to be smaller than the vertical overlap between the lower end of the second medium hole and the upper end of the downward pointing hole adjacent to the second medium hole;
The heating cooker, wherein the flame detection means is configured to be capable of detecting flame formed in the first medium flame hole. In the heat cooker according to any one of claims 1 to 3,
The heating cooker, wherein the connecting portion has an inclination angle different from the inclination angles of the first inclined surface portion and the second inclined surface portion so as to form a substantially flat portion extending in the front-rear direction.

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