Grill burner and cooker

Abstract

To a grill burner, even when there is a rapid temperature rise immediately after a flame hole is ignited, capable of effectively suppressing thermal deformation, and a cooker.SOLUTION: An upper burner 30 is formed by vertically superposing an upper metal plate and a lower metal plate 32 and swaging the outer peripheral part. The lower metal plate 32 includes a flame hole 50 in a part forming a body part 41. The flame hole 50 includes a front flame hole portion 501, a right flame hole portion 502, and a left flame hole portion 503. The lower metal plate 32 includes a pyramid-shaped central drawn part 60 formed in a prescribed area 100 surrounded by the front flame hole portion 501, the right flame hole portion 502, and the left flame hole portion 503. The central drawn part 60 protrudes downward. The central drawn part 60 includes reinforcing drawn portions 71 to 73 that protrude further downward.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a grill burner and a cooking device. [Background technology]

[0002] Conventionally, a grill equipped with a grill burner on the upper side of the grill chamber is known. On the combustion surface, which is the lower surface of the grill burner, a group of burner flame holes is arranged in a U-shape when viewed from the bottom. In the inner area, a pyramidal constriction protruding downward is formed to prevent distortion due to thermal deformation of the combustion surface immediately after ignition (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-150884 A Summary of the Invention [Problem to be solved by the invention]

[0004] The ignition electrode is provided on either the left or right side of the burner flame hole group. Therefore, as the temperature of the combustion surface rises immediately after ignition, the temperature distribution of the combustion surface becomes uneven in the left and right directions. This can cause distortion in the constriction and lead to unexpected thermal deformation. If the thermal deformation is large, the combustion surface can reverse and lead to extinguishing.

[0005] In addition, the grill burner has two metal plates with the outer periphery crimped. Furthermore, the mixing tube where the air and gas are mixed is located upstream of the gas flow. This means that thermal deformation tends to concentrate at the constricted part. In addition, the press forming of the metal plate can cause the ridge of the pyramid to bend. In this case, the bending can reverse with an increase in temperature, and the resulting deformation can cause abnormal noise.

[0006] An object of the present invention is to provide a grill burner and a cooking apparatus that can effectively suppress thermal deformation even if there is a sudden rise in temperature immediately after ignition of the burner port. [Means for solving the problem]

[0007] The grill burner of claim 1 is a plate-shaped grill burner formed by stacking an upper metal plate and a lower metal plate one above the other and crimping their outer peripheries, and is provided above a grill chamber, the grill burner comprising a main body portion having a gas flow path on the inside, and a burner port portion having an array of a plurality of burner holes communicating with the gas flow path provided in a portion of the lower metal plate that forms the main body portion, the burner port portion comprising a front burner port portion extending in the left-right direction at the front end side of the lower metal plate, a right burner port portion extending rearward from a right end portion of the front burner port portion, and a left burner port portion extending rearward from a left end portion of the front burner port portion. In the lower metal plate, a pyramidal central drawn portion protruding downward is formed in a predetermined area surrounded by the front flame hole portion, the right flame hole portion, and the left flame hole portion, and a reinforcing drawn portion protruding further downward is formed in the central drawn portion.

[0008] The grill burner of claim 2 comprises an inlet section provided at the rear end side of the main body section, for allowing gas and air to be supplied to the gas flow path to flow in from the outside, and a mixing section provided between the inlet section and the main body section, for mixing the gas and air flowing in from the inlet section and supplying the gas to the gas flow path, wherein a mixing constriction section is formed in a portion of the lower metal plate that forms the mixing section, protruding downward and extending from the inlet section side toward the main body section side, and the reinforcing constriction section is provided at least forward of the apex of the central constriction section.

[0009] In the lower metal plate of the grill burner of claim 3, a substantially straight right-side constricted portion that protrudes downward and extends in the front-to-rear direction parallel to the right-side flame port portion is provided near the right side of the right-side flame port portion, and a substantially straight left-side constricted portion that protrudes downward and extends in the front-to-rear direction parallel to the left-side flame port portion is provided near the left side of the left-side flame port portion.

[0010] The reinforcing constriction portion of the grill burner according to claim 4 may be provided so as to straddle a middle position in the left-right direction of the predetermined region.

[0011] The grill burner of claim 5 may have a plurality of reinforcing throttle portions arranged side by side with gaps in the front-rear direction.

[0012] The reinforcing constricted portion of the grill burner according to claim 6 may be formed in a generally rectangular shape that is long in the left-right direction.

[0013] The cooking device of claim 7 is characterized in that it comprises a grill chamber and the grill burner of claim 1 is provided above the grill chamber. Effect of the Invention

[0014] According to the grill burner of claim 1, a reinforcing drawn portion is further formed in the pyramid-shaped central drawn portion. This makes it possible to effectively suppress thermal deformation of the lower metal plate even if there is a sudden temperature rise in the main body immediately after ignition in the burner port portion. The reinforcing drawn portion protrudes further downward from the central drawn portion, but the height of the reinforcing drawn portion formed in the base portion of the pyramid may be lower than the drawn portion at the apex of the central drawn portion. This eliminates the need to make the drawn depth of the reinforcing drawn portion deeper than necessary.

[0015] According to the grill burner of claim 2, since the mixed drawn portion is formed on the rear end side of the lower metal plate, the reinforcing drawn portion only needs to be provided forward of the apex of the central drawn portion. This makes it possible to minimize the area in which the reinforcing drawn portion is provided during the manufacture of the grill burner. Therefore, in this embodiment, when modifying the mold from a conventional grill burner shape to a shape that includes a reinforcing drawn portion, the mold requires fewer changes, and the number of steps required to provide the reinforcing drawn portion can be reduced.

[0016] According to the grill burner of claim 3, the right-side constricted portion is provided in parallel to the right side of the right-side flame port portion, preventing thermal deformation around the right-side flame port portion. Furthermore, the left-side constricted portion is provided in parallel to the left side of the left-side flame port portion, preventing thermal deformation around the left-side flame port portion. Although distortion is concentrated in the central constricted portion by the right-side and left-side constricted portions, a reinforcing constricted portion is formed in the central constricted portion, preventing thermal deformation in a predetermined area surrounded by the flame port portion.

[0017] According to the grill burner of claim 4, since the reinforcing constriction portion has a shape spanning the left and right, the rigidity of the lower metal plate in the left and right direction can be improved in a well-balanced manner. This makes it possible to narrow the area where the deformation of the lower metal plate occurs and the lowest point occurs.

[0018] According to the grill burner of claim 5, since the multiple reinforcing constrictions are arranged with gaps in the front-rear direction, the rigidity of the lower metal plate in the front-rear direction can be improved in a well-balanced manner. This makes it possible to narrow the area where the deformation of the lower metal plate occurs and the lowest point occurs.

[0019] According to the grill burner of claim 6, since the reinforcing constriction portion is substantially rectangular and long in the left-right direction, the rigidity of the lower metal plate in the left-right direction can be improved in a well-balanced manner. This makes it possible to narrow the area where the deformation of the lower metal plate occurs and the lowest point occurs.

[0020] According to the heat cooking device of claim 7, since it is equipped with the grill burner of claim 1, the effect of claim 1 can be obtained. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a perspective view of a grill device 1. [Diagram 2] FIG. 2 is a perspective view of the upper fire burner 30. [Diagram 3] FIG. 2 is a perspective view of the upper burner 30 with its lower surface facing upward. [Figure 4] FIG. 2 is a bottom view of the upper fire burner 30. [Diagram 5]FIG. 4 is a bottom view of the upper fire burner 310. [Figure 6] FIG. 4 is a bottom view of the upper fire burner 320. [Figure 7] 13 is an image analyzing the thermal deformation that occurred immediately after the ignition of the upper burner 320. [Figure 8] 13 is an image analyzing the thermal deformation that occurred immediately after the ignition of the upper burner 310. [Figure 9] 13 is an analysis image of thermal deformation that occurs immediately after ignition of the upper burner 30. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of the present invention will be described. The device configurations described below are merely illustrative examples, and are not intended to be limiting unless otherwise specified. The drawings are used to explain technical features that may be adopted by the present invention.

[0023] The configuration of the grill device 1 will be described with reference to Fig. 1. The grill device 1 is attached inside the housing of a gas stove (not shown). The grill device 1 includes a grill chamber 2, a grill door 3, an exhaust duct 4, etc.

[0024] The grill chamber 2 is a double-sided grill. The grill chamber 2 is formed in a substantially rectangular box shape, and includes an upper wall portion 11, a right wall portion 12, a left wall portion (not shown), and a bottom wall portion (not shown). A grill opening portion (not shown) that is rectangular in front view is provided on the front side of the grill chamber 2. An upper burner 30 is provided on the upper wall portion 11. The upper burner 30 forms a flame downward toward the inside of the grill chamber 2. A right flame port portion (not shown) of the lower burner 20 is provided in a horizontal line approximately at the middle of the inner surface of the right wall portion 12. A left flame port portion (not shown) of the lower burner 20 is provided in a horizontal line approximately at the middle of the inner surface of the left wall portion. The right flame port portion and the left flame port portion extend in the front-rear direction and face each other at the same height. The right flame port portion and the left flame port portion form a flame toward the center of the grill chamber 2. A gas intake port 21 for the lower burner 20 is provided at the right rear part of the grill chamber 2. A grill door 3 is provided at the front side of the grill chamber 2, and opens and closes the grill opening manually. An exhaust duct 4 is provided at the rear of the grill chamber 2. The inside of the exhaust duct 4 communicates with the inside of the grill chamber 2. A grill exhaust port 15 is provided at the top of the exhaust duct 4. The grill exhaust port 15 discharges the combustion exhaust air flowing from inside the grill chamber 2 to the outside.

[0025] The structure of the upper-fire burner 30 will be described with reference to Figs. 2 to 4. As shown in Figs. 2 and 3, the upper-fire burner 30 is a so-called "flat burner" formed in a plate shape. The upper-fire burner 30 is formed by stacking an upper metal plate 31 and a lower metal plate 32 (see Fig. 3) vertically and crimping the outer periphery of the upper metal plate 31 to the outer periphery of the lower metal plate 32. Therefore, a plurality of crimped portions 35 are provided on the outer periphery of the upper-fire burner 30. The upper metal plate 31 and the lower metal plate 32 are produced by press molding. The upper-fire burner 30 includes a main body portion 41 and a gas inlet portion 42. The main body portion 41 is substantially rectangular and slightly elongated in the front-rear direction in a plan view.

[0026] As shown in FIG. 2, a gas flow path forming portion 43 is provided in the approximate center of the portion of the upper metal plate 31 corresponding to the main body portion 41, excluding the outer periphery. The gas flow path forming portion 43 is in an approximately rectangular shape in plan view, with one step higher upward. The inside of the gas flow path forming portion 43 is hollow. A gas flow path is formed in the internal space. The vertical width of the gas flow path is, for example, 5.5 mm. A recessed portion 44 is formed in the approximate center of the upper surface of the gas flow path forming portion 43. The recessed portion 44 is in an elliptical shape that is long in the vertical direction in plan view. The recessed portion 44 is formed by recessing the upper surface of the gas flow path forming portion 43 downward. Therefore, the gas that flows inside the gas flow path forming portion 43 diffuses throughout the entirety by wrapping around the recessed portion 44.

[0027] The gas inlet section 42 is provided at the rear of the main body section 41. The gas inlet section 42 includes, in order from the upstream side to the downstream side of the gas flow, a gas inlet 45, a throat section 46, and a mixing section 47. The gas inlet 45 is an opening whose diameter expands in a trumpet shape toward the right. A nozzle (not shown) for ejecting gas from a gas supply device (not shown) is disposed opposite the gas inlet 45 from the right. The throat section 46 is substantially cylindrical and extends leftward from the gas inlet 45. The portion of the throat section 46 that connects to the gas inlet 45 narrows in diameter toward the gas inlet 45.

[0028] The mixing section 47 is provided perpendicularly between a front portion on the left end side of the throat section 46 and a right portion of the rear end part of the gas flow passage forming section 43. The mixing section 47 includes an upper mixing throttle section 471 and a lower mixing throttle section 472 (see FIG. 3). The upper mixing throttle section 471 is a throttle section formed by pressing the upper metal plate 31. The lower mixing throttle section 472 is a throttle section formed by pressing the lower metal plate 32. The mixing section 47 is formed by combining the upper mixing throttle section 471 and the lower mixing throttle section 472 vertically.

[0029] In gas inlet section 42 having the above-mentioned shape, gas ejected from the nozzle flows into throat section 46 via gas inlet 45 while taking in surrounding air. The gas and air flow leftward through throat section 46 and enter mixing section 47. The gas and air are temporarily accumulated in mixing section 47 and are thoroughly mixed, then turn forward and flow forcefully into the inside of gas flow path forming section 43.

[0030] Next, a description will be given of the structure of the underside of the upper-fire burner 30. Note that, although Fig. 3 is a perspective view of the upper-fire burner 30 with the underside facing up, in order to uniformly express the orientation (direction) of the upper-fire burner 30, the description will be given in the orientation (direction) when the upper-fire burner 30 is attached to the grill device 1.

[0031] As shown in Figs. 3 and 4, a burner hole section 50 is provided in a portion of the lower metal plate 32 corresponding to the gas flow passage forming section 43 (see Fig. 2). The burner hole section 50 is substantially U-shaped and opens rearward when viewed from the bottom. The burner hole section 50 is formed by arranging a large number of burner holes, and includes a front burner hole section 501, a right burner hole section 502, and a left burner hole section 503. In each burner hole, a flame is formed by igniting gas supplied from the gas flow passage forming section 43. The front burner hole section 501 extends in the left-right direction at the front end side of the main body section 41. The right burner hole section 502 extends rearward in a substantially straight line from the right end of the front burner hole section 501. The left burner hole section 503 extends rearward in a substantially straight line from the left end of the front burner hole section 501. An ignition burner hole section 504 is provided at the rear end of the left burner hole section 503. The ignition port section 504 is a group of ports in the port section 50 that are first ignited by an ignition electrode (not shown).

[0032] In the lower metal plate 32, the above-mentioned lower mixed drawn portion 472 is formed on the rear end side of the main body portion 41. The lower mixed drawn portion 472 is formed in a generally rectangular shape when viewed from the bottom, and protrudes downward from the surface of the lower metal plate 32 by press forming.

[0033] The lower metal plate 32 is further provided with a right side drawn portion 55, a left side drawn portion 56, and a central drawn portion 60. The right side drawn portion 55 is provided between the right side flame hole portion 502 and the right end portion of the main body portion 41, and extends parallel to the right side flame hole portion 502 and in a substantially straight line. The right side drawn portion 55 protrudes downward from the surface of the lower metal plate 32 by press forming. The right side drawn portion 55 increases the rigidity of the portion between the right side flame hole portion 502 and the right end portion of the main body portion 41. Therefore, the right side drawn portion 55 can prevent the area between the right side flame hole portion 502 and the right end portion of the main body portion 41 from becoming hot and being thermally deformed due to the ignition of the right side flame hole portion 502. The left side drawn portion 56 is provided between the left side flame hole portion 503 and the left end portion of the main body portion 41, and extends parallel to the left side flame hole portion 503 and in a substantially straight line. The left side drawn portion 56 also protrudes downward by press forming. Left-side narrowed portion 56 increases the rigidity of the portion between left-side flame hole portion 503 and the left end portion of main body portion 41. Therefore, left-side narrowed portion 56 can prevent the area between left-side flame hole portion 503 and the left end portion of main body portion 41 from becoming too hot and being thermally deformed when left-side flame hole portion 503 is ignited.

[0034] The central drawn portion 60 is formed in a rectangular predetermined region 100 surrounded by the inside of the U-shaped burner port portion 50. The central drawn portion 60 is a quadrangular pyramid having an apex 65, and is formed in a so-called pyramid shape. The height of the apex 65 is, for example, about 2 mm. The central drawn portion 60 is formed by press molding. The central drawn portion 60 increases the rigidity of the predetermined region 100.

[0035] In this embodiment, in order to further reinforce the rigidity of the central drawn portion 60, three reinforcing drawn portions 71 to 73 are further provided in the region forward of the apex 65 of the central drawn portion 60. Since the burner port portion 50 is U-shaped, the region forward of the apex 65 of the central drawn portion 60 is the portion where the temperature rise is most remarkable and is easily deformed. The reinforcing drawn portions 71 to 73 are formed in a substantially rectangular shape that is long in the left-right direction, and are provided side by side at equal intervals with gaps in the front-rear direction. The reinforcing drawn portions 71 to 73 are provided so as to straddle the middle position in the left-right direction of the predetermined region 100 in the left-right direction. The reinforcing drawn portions 71 to 73 are formed by further pressing the central drawn portion 60. The reinforcing drawn portions 71 to 73 protrude further downward from the central drawn portion 60. The height of the reinforcing drawn portions 71 to 73 formed in the base portion of the pyramid is approximately the same as the height of the apex 65 of the central drawn portion 60, and is preferably at least higher than the ridge line of the pyramid. This eliminates the need to make the depth of the reinforcing tapered portions 71 to 73 deeper than necessary, thereby preventing the combustion space in the grill chamber 2 from being narrowed.

[0036] The effect of preventing thermal deformation of the lower metal plate 32 by the central drawn portion 60 and the reinforcing drawn portions 71 to 73 will be described. When the user presses the ignition button (not shown), gas flows into the gas flow passage forming portion 43 of the upper burner 30. With gas being supplied to the burner port portion 50, the igniter is driven and the ignition electrode (not shown) generates a spark discharge. The spark discharge ignites the ignition burner port portion 504 first. The flames formed in the burner ports of the ignition burner port portion 504 ignite the adjacent burner ports in the left burner port portion 503 one after another, followed by the front burner port portion 501 and the right burner port portion 502 in that order.

[0037] At this time, the temperature rise of the lower metal plate 32 immediately after ignition is likely to be biased to the left and right. As a result, distortion is likely to occur in the specified region 100 inside the burner port portion 50. The upper burner 30 is made by overlapping two metal plates, the upper metal plate 31 and the lower metal plate 32, and crimping the outer periphery. Furthermore, a right-side tapered portion 55 and a left-side tapered portion 56 are provided on both the left and right ends of the main body portion 41. A lower mixed tapered portion 472 is provided on the rear end side of the main body portion 41. For these reasons, distortion due to heat is likely to be concentrated in the central tapered portion 60, especially in the region forward of the apex 65.

[0038] Therefore, in this embodiment, three reinforcing tapered portions 71-73 are further provided in the region forward of the apex 65 of the central tapered portion 60. This allows the upper fire burner 30 to further improve the rigidity of the portion forward of the apex 65 of the central tapered portion 60. Therefore, even if there is a sudden temperature rise in the main body portion 41 immediately after the burner port portion 50 is ignited, the upper fire burner 30 can effectively suppress thermal deformation of the lower metal plate 32. Since thermal deformation of the deflection occurring at the ridge line of the central tapered portion 60 can also be suppressed, it is also possible to prevent abnormal noise caused by thermal deformation.

[0039] Moreover, the reinforcing drawn portions 71 to 73 are provided so as to straddle the left and right central positions of the predetermined region 100. This makes it possible to improve the rigidity of the lower metal plate 32 in the left and right direction in a well-balanced manner.

[0040] Modified examples of the reinforcing throttle portion will be described with reference to Fig. 4 to Fig. 6. As shown in Fig. 4, the upper fire burner 30 of this embodiment has three reinforcing throttle portions 71 to 73 that are long in the left-right direction and arranged in the front-rear direction in a region forward of the apex 65 of the central throttle portion 60. For example, the number, shape, position, etc. of the reinforcing throttle portions are not limited to those of this embodiment and may be changed.

[0041] 5, for example, two reinforcing throttle sections 81, 82 are provided side by side with a gap in the front-rear direction in an area forward of the apex 65 of the central throttle section 60 of an upper fire burner 310, which is a first modified example. These reinforcing throttle sections 81, 82 are rectangular and extend in the left-right direction as in the above embodiment, but the front-rear width is longer than the front-rear width of the reinforcing throttle sections 71-73 of the above embodiment.

[0042] 6, two reinforcing throttle sections 91, 92 are provided side by side with a gap in the left-right direction in an area forward of the apex 65 of the central throttle section 60 of the upper fire burner 320, which is the second modified example. These reinforcing throttle sections 91, 92 are substantially rectangular and slightly elongated in the front-rear direction.

[0043] The reinforcing throttle portions provided in these upper-fire burners 310, 320 can improve the rigidity of the central throttle portion 60, similar to the reinforcing throttle portions 71-73 of the upper-fire burner 30 of this embodiment. Therefore, in the upper-fire burners 310, 320, even if there is a sudden temperature rise in the main body portion 41 immediately after the burner port portion 50 is ignited, the thermal deformation of the lower metal plate 32 can be effectively suppressed.

[0044] Next, a verification experiment was conducted to examine the difference in the distortion prevention effect of the lower metal plate 32 due to the difference in the number, shape, and arrangement of the reinforcing drawn parts. In this verification experiment, the deflection occurring in the central drawn part 60 of the lower metal plate 32 immediately after ignition (for example, 5 seconds after ignition) was measured for three types of burners, namely, the upper fire burner 320 (second modified example: see FIG. 6), the upper fire burner 310 (first modified example: see FIG. 5), and the upper fire burner 30 (this embodiment: see FIG. 4). A three-dimensional thermal deformation measuring device was used for the measurement. FIGS. 7 to 9 are analysis images of the upper fire burners 320, 310, and 30. The analysis images show the amount of change from the original shape of the central drawn part 60 of the lower metal plate 32, and the height difference is shown by contour lines. In each image, the position of the "maximum" corresponds approximately to the position of the apex 65 of the central drawn part 60. The position of the "maximum" protrudes toward the front side of the paper and indicates the highest position of the pyramid on the lower metal plate 32. In contrast, the "minimum" position indicates the lowest position where the lower metal plate 32 is inverted to the opposite side and recessed in the opposite direction to the "maximum" position. In other words, the direction protruding from the lower metal plate 32 into the inside of the grill chamber 2 is positive, and the direction recessed in the opposite direction is negative. Note that the central drawn portion 60 is omitted in the analysis images of Figures 7 to 9.

[0045] The verification results will be described. FIG. 7 is an analysis image of the deflection of the lower metal plate 32 of the upper burner 320. The lower metal plate 32 of the upper burner 320 has two reinforcing drawn portions 91, 92 arranged side by side. As shown in the analysis image, the deformation amount at the "maximum" position of the lower metal plate 32 was 0.062762 (mm), and the deformation amount at the "minimum" position was -0.065766 (mm). The "minimum" position is the lowest point of the lower metal plate 32. When the reinforcing drawn portions are divided into left and right portions as in this configuration, the lower metal plate 32 deforms with the center in the left-right direction as a base point due to thermal deformation immediately after ignition. As a result, it was found that the lowest point occurs over a wide area in the reinforcing drawn portion 92 on one side, that is, the left side. It is presumed that the reason that the lowest point is closer to the left side is that the left flame hole portion 503 of the flame hole portion 50 is ignited first, and the temperature distribution is biased to one side in the left-right direction.

[0046] 8 is an analysis image of the deflection of the lower metal plate 32 of the upper fire burner 310. Two reinforcing drawn portions 81, 82 are provided side by side in the front-rear direction on the lower metal plate 32 of the upper fire burner 310, straddling the middle position in the left-right direction. As shown in the analysis image, the deformation amount at the "maximum" position of the lower metal plate 32 was 0.070706 (mm), and the deformation amount at the "minimum" position was -0.044486 (mm).

[0047] In this configuration, compared to the upper-fire burner 320 shown in FIG. 7, there is no base point for deformation of the central drawn portion 60 in the left-right direction at the position where the two reinforcing drawn portions 81, 82 are provided. In the lower metal plate 32 of the upper-fire burner 310, a lowest point region is also generated to the left of the front reinforcing drawn portion 82. However, this region is narrower than the lowest point region generated in the upper-fire burner 320 shown in FIG. 7. From this, it was found that the upper-fire burner 310 can suppress distortion when thermal deformation occurs in the lower metal plate 32 compared to the upper-fire burner 320. However, in the upper-fire burner 310, since the two reinforcing drawn portions 81, 82 are separated in the front-rear direction, the lowest point region is generated wider compared to the upper-fire burner 30 described later.

[0048] FIG. 9 is an analysis image of the deflection of the lower metal plate 32 of the upper burner 30 according to the present embodiment. The lower metal plate 32 of the upper burner 30 is provided with three reinforcing drawn portions 71-73 arranged in the front-rear direction so as to straddle the middle position in the left-right direction. The front-rear width of each of the reinforcing drawn portions 71-73 is shorter than the front-rear width of each of the reinforcing drawn portions 81, 82. Here, when the front-rear distance between the reinforcing drawn portions 81, 82 shown in FIG. 8 is L2, the front-rear distance L1 between each of the reinforcing drawn portions 71-73 shown in FIG. 9 is narrower than L2. As shown in the analysis image, the deformation amount at the "maximum" position in the lower metal plate 32 was 0.065912 (mm), and the deformation amount at the "minimum" position was -0.032375 (mm).

[0049] In this configuration, the three reinforcing drawn portions 71-73 are provided with a narrower interval in the front-rear direction than the two reinforcing drawn portions 81, 82. This improves the rigidity between the reinforcing drawn portions 71-73. Also in the lower metal plate 32 of the upper-fire burner 30, a lowest point region occurs on the left side of the reinforcing drawn portion 82 located at the most forward side. However, this region is considerably narrower than the lowest point region generated in the upper-fire burner 310 shown in FIG. 8, and the amount of deformation is also small. From these results, it was found that, among the three types of upper-fire burners 30, 310, and 320, the upper-fire burner 30 of this embodiment can most effectively suppress distortion due to thermal deformation of the lower metal plate 32. In other words, it was found that the upper-fire burner 30 can effectively prevent distortion due to thermal deformation by forming the reinforcing drawn portions so as to straddle the center in the left-right direction in the central drawn portion 60, and arranging multiple reinforcing drawn portions in the front-rear direction with a narrower interval in the front-rear direction.

[0050] As described above, the grill device 1 of this embodiment includes the grill chamber 2. The grill chamber 2 is provided with the upper fire burner 30. The upper fire burner 30 is formed by stacking the upper metal plate 31 and the lower metal plate 32 vertically and crimping the outer periphery. The upper fire burner 30 is a plate-shaped grill burner provided on the upper side of the grill chamber 2. The upper fire burner 30 includes a main body 41. The main body 41 includes a gas flow path on the inside. In the lower metal plate 32, a burner hole portion 50 is provided in a portion forming the main body 41. The burner hole portion 50 includes a plurality of burner holes arranged and communicates with the gas flow path. The burner hole portion 50 includes a front burner hole portion 501, a right burner hole portion 502, and a left burner hole portion 503. The front burner hole portion 501 is extended in the left-right direction on the front end side of the lower metal plate 32. The right-side burner hole portion 502 extends rearward from the right end portion of the front-side burner hole portion 501. The left-side burner hole portion 503 extends rearward from the left end portion of the front-side burner hole portion 501. In the lower metal plate 32, a pyramid-shaped central drawn portion 60 is formed in a predetermined region 100 surrounded by the front-side burner hole portion 501, the right-side burner hole portion 502, and the left-side burner hole portion 503. The central drawn portion 60 protrudes downward. Reinforcing drawn portions 71 to 73 protruding further downward are formed in such a central drawn portion 60. This allows the upper burner 30 to effectively suppress thermal deformation of the lower metal plate 32 even if there is a sudden temperature rise in the main body portion 41 immediately after the burner hole portion 50 is ignited. In addition, the height of the reinforcing drawn portions 71 to 73 is approximately the same as the height of the apex 65 of the central drawn portion 60, and is preferably at least higher than the ridge line of the pyramid. This eliminates the need to make the depth of the reinforcing tapered portions 71 to 73 deeper than necessary, thereby preventing the combustion space in the grill chamber 2 from being narrowed.

[0051] In the above description, the grill device 1 is an example of the "cooking device" of the present invention. The upper fire burner 30 is an example of the "grill burner" of the present invention.

[0052] The present invention is not limited to the above embodiment, and various modifications are possible in addition to the above modified examples. The grill device 1 is provided, for example, in the housing of a gas stove, but it may be a standalone grill device. The grill chamber 2 is a double-sided grill, but it may be a single-sided grill, for example, by omitting the lower flame burner 20.

[0053] As described above, the number, shape, and arrangement of the reinforcing drawn portions provided on the lower metal plate 32 of the upper burner 30 can be changed in various ways. For example, the number of reinforcing drawn portions may be one or three or more. By narrowing the reinforcing drawn portions long in the left-right direction and arranging many of them in the front-rear direction, the rigidity of the central drawn portion 60 can be effectively improved. However, the more reinforcing drawn portions are provided, the more uneven the surface of the central drawn portion 60 becomes, making it difficult to maintain its aesthetic appearance, or dirt may accumulate in the grooves, making cleaning more difficult. Furthermore, providing many reinforcing drawn portions may increase the processing cost and difficulty. For these reasons, it is preferable to adjust the number of reinforcing drawn portions appropriately. In addition, in the above embodiment, the reinforcing drawn portions are provided in the region forward of the apex 65 of the central drawn portion 60, but they may be provided in other regions. It is preferable to provide them at least in the region forward of the apex 65. The shape of the reinforcing drawn portions is not limited to a rectangular shape, and may be, for example, a triangular shape, a circular shape, a dot shape, etc., and the reinforcing drawn portions extending in the front-rear direction and the reinforcing drawn portions extending in the left-right direction may cross each other. For example, it may be in a + shape, an x ​​shape, etc. Also, the right narrowed portion 55 and the left narrowed portion 56 may be omitted. [Explanation of symbols]

[0054] 1 Grilling device 2 Grill room 30,310,320 Top burner 31 Upper metal plate 32 Lower metal plate 41 Main body 47 Mixing section 50 Flame hole part 55 Right side squeeze section 56 Left side squeeze section 60 Central drawing section 65 Vertex 71~73 Reinforced draw section 81,82 Reinforced drawer 91,92 Reinforced drawer 100 predetermined area 310 Top burner 320 Top burner 472 Lower mixing throttle section 501 Front flame hole 502 Right side flame hole 503 Left side flame hole

Claims

1. A plate-shaped grill burner formed by stacking an upper metal plate and a lower metal plate vertically and crimping the outer periphery, and installed on the upper side of a grill chamber, A gas supply pipe includes a main body having a gas flow passage therein, a burner hole portion having an array of burner holes communicating with the gas flow path is provided in a portion of the lower metal plate that forms the main body; The burner hole portion is a front flame hole portion extending in the left-right direction at a front end side of the lower metal plate; a right side flame hole portion extending rearward from a right end portion of the front side flame hole portion; a left side flame hole portion extending rearward from a left end portion of the front side flame hole portion; Equipped with a pyramid-shaped central drawn portion protruding downward is formed in a predetermined region of the lower metal plate surrounded by the front flame hole portion, the right flame hole portion, and the left flame hole portion, The central drawn portion is further formed with a reinforcing drawn portion protruding downward. A grill burner that features:

2. an inlet portion provided on a rear end side of the body portion and through which gas and air to be supplied to the gas flow passage flow in from the outside; a mixing section provided between the inlet section and the main body section, which mixes the gas and air flowing in from the inlet section and supplies the gas to the gas flow path; Equipped with A mixing constriction portion is formed in a portion of the lower metal plate that forms the mixing portion, the mixing constriction portion protruding downward and extending from the inlet portion side toward the main body portion side, The reinforcing drawn portion is provided at least forward of the apex of the central drawn portion.

2. The grill burner according to claim 1 .

3. In the lower metal plate, A right-side narrowed portion is provided in the right vicinity of the right-side flame port portion, the right-side narrowed portion being substantially linear and protruding downward and extending in the front-rear direction in parallel with the right-side flame port portion, A left narrowed portion having a substantially straight shape is provided on the left side of the left flame port portion, the left narrowed portion protruding downward and extending in the front-rear direction parallel to the left flame port portion.

2. The grill burner according to claim 1 .

4. The reinforcing tapered portion is provided so as to straddle a middle position in the left-right direction of the predetermined region.

3. The grill burner according to claim 1 or 2.

5. The reinforcing squeezed portion is a plurality of portions, and is arranged side by side with gaps in the front-rear direction.

5. The grill burner according to claim 4.

6. The reinforcing drawn portion is formed in a substantially rectangular shape that is long in the left-right direction.

6. The grill burner according to claim 5.

7. A grill burner as claimed in claim 1 is provided on the upper side of the grill. A heating and cooking device characterized by the above.

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