Gas burner unit and heating cooker including gas burner unit

Abstract

To uniformly heat and brown a hot plate in a gas burner unit B provided with a gas burner 2 having a plurality of flame holes 22 opened upward along an X-axis direction and the hot plate 3 arranged above the gas burner and having a cross-sectional shape projecting upward.SOLUTION: A plurality of vent holes 31 for passing combustion gas are formed on a hot plate along the X-axis direction, and a plurality of vent hole rows 32 consisting of a plurality of vent holes arranged in the X-axis direction are arranged in parallel in the Y-axis direction. The vent hole is formed along the lower surface of a cut and raised piece part 34 of the hot plate cut and raised upward so as to open toward the Y-axis outward direction. A first vent hole row and a second vent hole row are adjacent to each other in the Y-axis direction, at least a part of the vent holes of the first vent hole row and the second vent hole row overlaps in the Y-axis direction, and a Y-axis direction outer edge of the cut-and-raised piece of the first vent hole row is close to a Y-axis direction inner edge of the cut-and-raised piece of the second vent hole row.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a gas burner unit and a cooking appliance equipped with the gas burner unit, and more particularly to a gas burner unit suitable for supplying hydrogen gas to a gas burner and diffusing and burning the hydrogen gas ejected from each flame hole. [Background technology]

[0002] Conventionally, a gas burner unit including a gas burner with a plurality of upwardly opening flame holes formed along the X-axis direction, with two orthogonal horizontal directions being the X-axis direction and the Y-axis direction, and a hot plate with an upwardly convex (mountain-shaped) cross section arranged above the gas burner, and a cooking appliance including this gas burner unit are known, for example from Patent Document 1. In this appliance, the hot plate is heated to a red heat by combustion gas generated by combustion of fuel gas ejected from each flame hole of the gas burner, and far infrared rays radiated from this red-hot hot plate can heat (grill) food such as meat or fish placed on the grill of the cooking appliance.

[0003] In the above-mentioned conventional example, the hot plate has ventilation holes for allowing combustion gas to pass through, but only one row of ventilation holes arranged in the X-axis direction is formed on each side of the Y-axis direction. Therefore, the draft effect caused by the combustion gas passing through each ventilation hole is not fully realized, and the combustion gas overflows from the bottom end of the hot plate, resulting in the problem of the hot plate not being heated evenly to red-hot. This problem becomes more pronounced when hydrogen gas without primary air is supplied to the gas burner and the hydrogen gas ejected from each flame hole is diffused and burned. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2023-46513 Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above, it is an object of the present invention to provide a gas burner unit in which a hot plate is heated evenly to red heat, and a cooking appliance equipped with this gas burner unit. [Means for solving the problem]

[0006] In order to solve the above problems, a gas burner unit of a first invention includes a gas burner in which a plurality of flame holes opening upward are formed along the X-axis direction, with two orthogonal horizontal directions being the X-axis direction and the Y-axis direction, and a hot plate arranged above the gas burner and having a cross section with an upwardly convex shape, wherein a plurality of vent holes are formed in the hot plate along the X-axis direction to allow combustion gas generated by combustion of the gas burner to pass through, a plurality of vent hole rows each consisting of a plurality of vent holes lined up in the X-axis direction are arranged in parallel in the Y-axis direction, and the vent holes are cut upward so as to open outward in the Y-axis direction. The cooking device according to a second aspect of the present invention is characterized in that the cooking device is provided with the gas burner unit as described above, and the cooking device is provided with a gas burner unit as described above.

[0007] According to the present invention, when fuel gas is supplied to the gas burner, the combustion gas passes through the vent holes in the multiple vent hole rows, resulting in a strong draft effect. This allows the combustion gas to reach the center of the lower surface of the hot plate, which is the top of the hot plate in the Y-axis direction. Furthermore, since multiple vent hole rows are arranged in parallel in the Y-axis direction, the combustion gas passes not only through the vent holes in the innermost vent hole row in the Y-axis direction, but also through the vent holes in the outermost vent hole rows in the Y-axis direction, thereby heating the hot plate from its underside. In addition, the combustion gas passing through the vent holes in the first vent hole row flows along the upper surface of the cut-and-raised piece in the second vent hole row, thereby heating the hot plate from its upper side as well. As a result, the hot plate is heated from both the top and bottom, allowing it to be heated evenly and efficiently across its entire surface. In this case, in order to further enhance the heating effect of the hot plate from the top side, it is preferable that the opening width of each air hole in the first air hole row along the X-axis direction is the same as the opening width of each air hole in the second air hole row along the X-axis direction, and that each air hole in the first air hole row and each air hole in the second air hole row are aligned in the Y-axis direction.

[0008] In the present invention, it is preferable that the cut-and-raised piece is cut and raised in a bridge shape, and both ends of the cut-and-raised piece in the X-axis direction are connected to the hot plate, which is advantageous in that the combustion gas that has passed through each vent hole in the first vent hole row can be reliably guided to the upper surface of the cut-and-raised piece in the second vent hole row.

[0009] In the present invention, the fuel gas supplied to the gas burner is hydrogen gas without primary air being mixed in, which is suitable for diffusive combustion of hydrogen gas ejected from the flame holes. In other words, diffusive combustion of hydrogen gas requires a large amount of secondary air. However, in the present invention, multiple rows of vent holes arranged in the X-axis direction are aligned in parallel in the Y-axis direction, thereby creating a strong draft effect, as described above. Therefore, the draft effect allows a large amount of secondary air to be supplied to the hydrogen gas ejected from each flame hole of the gas burner, thereby improving combustion stability. Furthermore, the high-temperature combustion gas (mainly steam gas) generated by the combustion of hydrogen gas passes through the vent holes and comes into contact with the food to be cooked, thereby not only heating the food but also washing away fat and salt contained in the food with the steam gas. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view of a cooking device according to an embodiment of the present invention; [Figure 2] FIG. 2 is a cross-sectional side view taken along line II-II in FIG. [Figure 3] FIG. 3 is a cross-sectional front view taken along line III-III in FIG. 2. [Figure 4] FIG. 2 is a perspective view of a gas burner unit according to an embodiment of the present invention, which is provided in the cooking device according to the embodiment. [Figure 5] FIG. 5 is a plan view showing the gas burner unit shown in FIG. 4 with a portion thereof omitted. [Figure 6] Cross-sectional view taken along line VI-VI in Figure 5. [Figure 7] Analysis results of the flow of combustion gas when hydrogen gas is diffused and burned using a gas burner. DETAILED DESCRIPTION OF THE INVENTION

[0011] 1 to 3, a cooking appliance H according to an embodiment of the present invention is used for grilling food such as meat or fish, and has a body 1 with an open top, with a burner unit B according to an embodiment of the present invention provided at an upper portion of the body 1. The burner unit B is provided with a gas burner 2 elongated in the X-axis direction, with two horizontal orthogonal directions being the X-axis direction and the Y-axis direction, and a metal hot plate 3 arranged above the gas burner 2 and having a cross section with an upwardly convex shape (specifically, an upwardly convex arc shape). In this embodiment, a plurality of burner units B (specifically, four units) are arranged side by side in the Y-axis direction.

[0012] A grill 4 on which food to be cooked is placed is disposed above the appliance body 1. The grill 4 is mounted on a rectangular support frame 42 connected to the upper ends of vertically movable support posts 41 provided on both sides of the appliance body 1 in the Y-axis direction. The support posts 41 are raised and lowered by the vertical swing of an operating lever 43 protruding from one side of the appliance body 1 in the X-axis direction. A lock lever 44 is attached to the operating lever 43, which locks the operating lever 43 in any swing position. The operating lever 43 can be swung by pulling the lock lever 44 upward to release the lock. A drip tray 5 is disposed at the bottom of the appliance body 1 and can be moved forward and backward.

[0013] The gas burner 2 comprises a tubular burner body 21 elongated in the X-axis direction, with a plurality of upwardly opening flame holes 22 formed along the X-axis direction at the top of the burner body 21. In this embodiment, two adjacent flame hole rows, each consisting of a plurality of flame holes 22 along the X-axis direction, are provided in the Y-axis direction. The diameter of the flame holes 22 is set smaller than the so-called flashback limit (0.6 mm). Both ends of the burner body 21 in the X-axis direction are closed by plugs 23, 23. Referring to FIG. 4 , each plug 23 has a protrusion 231 protruding outward in the X-axis direction. The protrusions 231 of each plug 23 are fastened to support brackets 12 for the burner unit B, which are fixed to the frames 11 on both sides of the upper portion of the body 1 in the X-axis direction, thereby fixing and supporting the gas burner 2. Each support bracket 12 also supports each end of the hot plate 3 in the X-axis direction. In addition, the gas burner 2 is provided with an ignition electrode 24 serving as ignition means located above one end in the X-axis direction, and a thermocouple 25 serving as flame detection means located above the other end in the X-axis direction.

[0014] Each gas burner 2 is supplied with hydrogen gas, which is fuel gas but not mixed with primary air, via a connection passage 61, which is the downstream end of a gas supply passage extending from each valve unit 6 inside a box 13 attached to one surface in the X-axis direction of the body 1. The hydrogen gas then ejects from the flame holes 22 of the gas burners 2 and diffuses and burns. An operating knob 62 for the valve unit 6 and a power switch 63 for activating a controller (not shown) for each valve unit 6 are arranged on one outer surface in the X-axis direction of the box 13.

[0015] A partition plate 7 is erected between adjacent burner units B, B in the Y-axis direction. This prevents oil and grease dripping from the food being cooked from splashing onto the hot plate 3 of each burner unit B or running down the hot plate 3 from adhering to the flame holes 22 of the gas burner 2 of the adjacent burner unit B. The partition plate 7 is supported by inserting the lower ends of both ends in the X-axis direction into slits (not shown) formed in each frame 11 on both sides of the upper part of the appliance body 1 in the X-axis direction. Another partition plate 7 is erected outside the Y-axis direction of the outermost burner unit B in the Y-axis direction.

[0016] The hot plate 3 is disposed so that its lower edges 3a on both sides in the Y-axis direction are located above the flame holes 22 of the gas burner B. Referring to Figures 5 and 6, the hot plate 3 is formed with a plurality of vent holes 31 along the X-axis direction to pass combustion gas generated by combustion of the fuel gas ejected from each flame hole 22 of the gas burner B, and a plurality of vent hole rows 32 each consisting of a plurality of vent holes 31 aligned in the X-axis direction are arranged in parallel in the Y-axis direction. In this embodiment, the top of the hot plate 3, which includes the intersections 222, 222 of the hole axes 221, 221 extending directly upward from the burner holes 22 and the hot plate 3, is a non-ventilation area 33 where no vent holes 31 are provided, and three vent hole rows 32 are provided on each side of the non-ventilation area 33 in the Y-axis direction (hereinafter, the innermost vent hole row in the Y-axis direction is referred to as the "first vent hole row 321," the adjacent vent hole row is referred to as the "second vent hole row 322," and the outermost vent hole row in the Y-axis direction is referred to as the "third vent hole row 323"). The total opening area of ​​the vent holes 31 is set to be 5% to 25% of the surface area of ​​the hot plate 3.

[0017] Each vent hole 31 is formed along the lower surface of a cut-and-raised piece 34 of the hot plate 3, which is cut and raised upward so as to open outward in the Y-axis direction. Each cut-and-raised piece 34 is cut and raised in a bridge shape so that the opening width Wd along the X-axis direction is the same, and both ends 34a, 34a of the cut-and-raised piece 34 in the X-axis direction are connected to the hot plate 3. In this case, the outer edge 34b of the cut-and-raised piece 34 in the Y-axis direction is positioned outward in the Y-axis direction from the outer edge 31a of each vent hole 31. Since a known method can be used to cut and raise each cut-and-raised piece 34 on the hot plate 3, a detailed description will be omitted here. The first to third vent hole rows 321, 322, and 323 each have the same number of vent holes 31, and the vent holes 31 in the first vent hole row 321, the second vent hole row 322, and the third vent hole row 323 are aligned in the Y-axis direction. The hot plate 3 is heated to a red-hot state by combustion gases generated by the combustion of fuel gas ejected from each flame hole 22 of the gas burner 2, and the food on the grill 4 is cooked by the far infrared rays radiated from the hot plate 3 and the combustion gases that have passed through the vent holes 31.

[0018] According to the above embodiment, when hydrogen gas is supplied to the gas burner 2 and burned, the combustion gas (mainly water vapor gas) is ventilated through the vent holes 31 of the first to third vent hole rows 321, 322, and 323, resulting in a strong draft effect. As a result, the combustion gas reaches the non-vent hole region 33, which is the center in the Y-axis direction, on the underside of the hot plate 3. Furthermore, since the first to third vent hole rows 321, 322, and 323 are arranged in parallel in the Y-axis direction, the combustion gas is guided and passes not only through the vent holes 31 of the first vent hole row 321, which is the innermost in the Y-axis direction, but also through the vent holes 31 of the second and third vent hole rows 322 and 323, which are located on the outer sides in the Y-axis direction, and the hot plate 3 is heated from its underside. In addition, the combustion gas passing through each vent hole 31 in the first vent hole row 321 flows along the upper surface of the cut-and-raised piece 34 in the second vent hole row 322, and the combustion gas passing through each vent hole 31 in the second vent hole row 322 flows along the upper surface of the cut-and-raised piece 34 in the third vent hole row 323, so that the hot plate 3 is also heated from its upper surface. At this time, by forming the cut-and-raised piece 34 as described above, the combustion gas passing through each vent hole 31 in the first vent hole row 321 is reliably guided to the upper surface of the cut-and-raised piece 34 in the second vent hole row 322 located outward in the Y-axis direction, and the combustion gas passing through each vent hole 31 in the second vent hole row 322 is reliably guided to the upper surface of the cut-and-raised piece 34 in the third vent hole row 323 located outward in the Y-axis direction. As a result, the hot plate 3 is heated from both the top and bottom, so that the hot plate 3 can be heated evenly and efficiently over its entire surface. Furthermore, the combustion gas that passes through each vent hole 31 comes into contact with the food to be cooked, thereby not only heating the food, but also having the effect of washing away fat and salt contained in the food with the steam gas.

[0019] To confirm the effect of the present invention, a single gas burner unit B was used to analyze the flow of combustion gas when hydrogen gas was diffused and burned by the gas burner 2. In the analysis, the input, which is the calorific value of hydrogen gas per unit time, was set to 1500 kcal / h at room temperature (25°C) and atmospheric pressure. As a result, it was confirmed that high-temperature combustion gas flows along both the top and bottom surfaces of the hot plate 3, as shown in Figure 7, which shows the cross section of the hot plate 3.

[0020] Although the embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited thereto. In the above embodiment, the first to third air hole rows 32 1, The example has been described in which the opening widths and numbers of the ventilation holes 31 in the first and third ventilation hole rows 322 and 323 are the same and aligned in the Y-axis direction. 1, As long as at least a portion of the ventilation holes 31 of 322, 323 overlap in the Y-axis direction, this is not limiting. For example, the pitch between the side edges of the cut-and-raised pieces 34 adjacent to each other in the X-axis direction may be shifted by half between the first ventilation hole row 321 and the second ventilation hole row 322 and between the second ventilation hole row 322 and the third ventilation hole row 323.

[0021] In the above embodiment, the hot plate 3 has been described as having an upwardly convex arc-shaped cross section, but this is not limited thereto, and the cross section of the hot plate 3 can be, for example, a mountain-shaped or trapezoidal shape. In addition, while hydrogen gas is used as the fuel gas, this is not limited thereto, and gases other than hydrogen gas can also be used. Furthermore, although the cooking device in the above embodiment is for grilling, the present invention can also be applied to cooking devices other than those for grilling, such as stoves. In addition, in the above embodiment, the gas burner 2 has been described as having a tubular burner body 21 with multiple flame holes 22 formed on the upper part thereof, but this is not limited thereto, and the burner body can be, for example, flat. [Explanation of symbols]

[0022] H...heating cooker, B...gas burner unit, 2...gas burner, 22...flame hole, 3...heat plate, 31...vent hole, 31a...outer edge of vent hole in the Y-axis direction, 32...vent hole row, 321...first vent hole row, 322...second vent hole row, 323...third vent hole row, 34...cut-and-raised piece, 34a...both ends of cut-and-raised piece in the X-axis direction, Wd...opening width of vent hole along the X-axis direction.

Claims

1. A gas burner unit includes a gas burner having a plurality of upwardly opening flame holes formed along the X-axis direction, with two orthogonal horizontal directions being the X-axis direction and the Y-axis direction, and a hot plate disposed above the gas burner and having an upwardly convex cross section, A plurality of ventilation holes are formed in the hot plate along the X-axis direction to allow combustion gas generated by combustion of the gas burner to pass through, and a plurality of ventilation hole rows each consisting of a plurality of ventilation holes aligned in the X-axis direction are arranged in parallel in the Y-axis direction; The ventilation holes are formed along the lower surface of the cut-and-raised piece of the hot plate that is cut and raised upward so as to open outward in the Y-axis direction, a first vent hole row and a second vent hole row, the first vent hole row being adjacent to each other in the Y-axis direction, the second vent hole row being adjacent to each other in the Y-axis direction, the first vent hole row being adjacent to each other in the Y-axis direction, the second vent hole row being adjacent to each other in the Y-axis direction, the first vent hole row and the second vent hole row being adjacent to each other in the Y-axis direction, the first vent hole row and the second vent hole row being adjacent to each other in the Y-axis direction, the second ...

2. 2. The gas burner unit according to claim 1, wherein the opening width of each of the vent holes in the first vent hole row along the X-axis direction is the same as the opening width of each of the vent holes in the second vent hole row along the X-axis direction, and each of the vent holes in the first vent hole row and each of the vent holes in the second vent hole row are aligned in the Y-axis direction.

3. 3. The gas burner unit according to claim 1, wherein the cut-and-raised piece is cut and raised in a bridge shape, and both ends of the cut-and-raised piece in the X-axis direction are connected to the heat plate.

4. 3. A gas burner unit according to claim 1, wherein the fuel gas supplied to the gas burner is hydrogen gas without primary air being mixed therein, and the hydrogen gas is ejected from each of the flame holes to cause diffusion combustion.

5. A cooking appliance comprising the gas burner unit according to claim 1 or 2.

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