Gas burner unit and cooking appliance equipped with gas burner unit

Abstract

Two orthogonal horizontal directions are the X-axis direction and the Y-axis direction, and the gas burner unit B includes a gas burner 2 having a plurality of upwardly opening flame holes 22 formed along the X-axis direction, and a heat plate 3 arranged above the gas burner and having an upwardly convex cross section, so that the heat plate is heated evenly to red heat. [Solution] A plurality of ventilation holes 31 are formed in the hot plate along the X-axis direction to allow combustion gas generated by combustion of a gas burner to pass through, and a plurality of ventilation hole rows 32 each consisting of a plurality of ventilation holes aligned in the X-axis direction are arranged in parallel in the Y-axis direction. The total ventilation resistance of the ventilation holes in the innermost ventilation hole row in the Y-axis direction is set to be greater than the total ventilation resistance of the ventilation holes in the other ventilation hole rows.

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] To solve the above problems, a gas burner unit of a first invention comprises 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 arranged above the gas burner and having an upwardly convex cross section, 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, and a plurality of vent hole rows each consisting of a plurality of vent holes aligned in the X-axis direction are arranged in parallel in the Y-axis direction, and the total airflow resistance of the vent holes in the innermost vent hole row in the Y-axis direction is greater than the total airflow resistance of the vent holes in the other vent hole rows. Also, a cooking appliance of a second invention is characterized by comprising the above gas burner unit.

[0007] According to the present invention, when fuel gas is supplied to a gas burner and burned, the combustion gas is ventilated 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 in the Y-axis direction, which is the top of the hot plate. Furthermore, by increasing the total airflow resistance of the vent holes in the innermost vent hole row in the Y-axis direction and decreasing the total airflow resistance of the vent holes in the other vent hole rows, the combustion gas is guided and passes through not only the vent holes in the innermost vent hole row in the Y-axis direction but also the vent holes in the vent hole rows located on the outermost sides in the Y-axis direction. As a result, the hot plate can be heated evenly across its entire surface. In this case, it is preferable to adopt a configuration in which the total airflow resistance of the vent holes in each vent hole row decreases as the vent hole row becomes more outer in the Y-axis direction, so that the combustion gas reaches the outermost vent hole row in the Y-axis direction.

[0008] During cooking, oils and fats from the food being cooked may drip onto the upper surface of the hot plate. If the oils and fats drip onto the upper surface of the gas burner through the vent holes, they may clog the flame holes. Therefore, in the present invention, it is preferable that the vent holes be formed along the lower surface of the cut-and-raised pieces of the hot plate, which are cut and raised upward so that they open outward in the Y-axis direction. This prevents oils and fats dripping onto the upper surface of the hot plate from entering the vent holes. In this case, if the outer edge of the cut-and-raised pieces in the Y-axis direction is positioned further outward than the outer edge of the vent holes in the Y-axis direction, the penetration of oils and fats into the vent holes can be further prevented. Furthermore, if the cut-and-raised pieces are cut and raised in a bridge shape and both ends of the cut-and-raised pieces in the X-axis direction are connected to the hot plate, the penetration of oils and fats into the vent holes can be similarly further prevented, which is advantageous. Furthermore, it is preferable that the innermost row of vent holes in the Y-axis direction be located outside the intersection of the hot plate and the hole axis extending directly upward from the flame hole, thereby preventing oil and fat from the food being cooked from dripping directly onto the flame hole through the vent holes in the innermost row of vent holes in the Y-axis direction.

[0009] In the present invention, the fuel gas supplied to the gas burner is hydrogen gas without any mixed primary air, which is suitable for diffusive combustion of hydrogen gas ejected from the flame holes. While diffusive combustion of hydrogen gas requires a large amount of secondary air, the present invention provides a strong draft effect, as described above, by arranging multiple rows of vent holes aligned in the X-axis direction in parallel along the Y-axis direction. 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, when ejecting hydrogen gas for diffusive combustion, the diameter of the gas burner's flame holes must be smaller than the so-called flashback limit (0.6 mm). While grease and oil from the food being cooked can easily clog the flame holes when they drip onto the top surface of the gas burner, the present invention prevents grease and oil from penetrating the vent holes, eliminating the problem of easily clogging the flame holes. Furthermore, the high-temperature combustion gas (mainly steam gas) produced by the combustion of hydrogen gas passes through each vent and comes into contact with the food being cooked, not only heating the food but also having the effect of washing away the 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] FIG. 10 is a perspective view of a gas burner unit according to a modified example. 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 upward-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 also 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 between 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 will be referred to as the "first vent hole row 321," the adjacent vent hole row will be referred to as the "second vent hole row 322," and the outermost vent hole row in the Y-axis direction will be referred to as the "third vent hole row 323"). In other words, each first vent hole row 321 is located outside the intersections 222, 222 in the Y-axis direction. The total opening area of ​​each vent hole 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 number of ventilation holes 31 in each of the first to third ventilation hole rows 321, 322, and 323 is the same, and the ventilation holes 31 in the first ventilation hole row 321, the ventilation holes 31 in the second ventilation hole row 322, and the ventilation holes 31 in the third ventilation hole row 323 are aligned in the Y-axis direction.

[0018] The opening heights of the cut-and-raised pieces 34 are smallest for the opening height h1 of the first air hole row 321 and gradually increase for the opening height h2 of the second air hole row 322 and the opening height h3 of the third air hole row 323. In other words, the opening area of ​​the air holes 31 in the first air hole row 321 is smallest, and the opening area of ​​the air holes 31 in the second air hole row 312 and the opening area of ​​the air holes 31 in the third air hole row 313 are increased in that order. As a result, the total airflow resistance of the air holes 31 in the first air hole row 321 is greater than the total airflow resistance of the air holes 31 in the second air hole row 322 and the total airflow resistance of the air holes 31 in the third air hole row 323, and the total airflow resistance increases toward the outer side of the air hole row in the Y axis direction. The hot plate 3 is heated to red heat by the combustion gas generated by the combustion of the fuel gas ejected from each flame hole 22 of the gas burner 2, and the food to be cooked on the grill 4 is heated and cooked by the far infrared rays radiated from the hot plate 3 and the combustion gas that has passed through the ventilation holes 31.

[0019] 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. This allows the combustion gas to reach the non-vent hole region 33 at the center in the Y-axis direction, which is the uppermost portion of the underside of the hot plate 3. The total ventilation resistance of the vent holes 31 of the first vent hole row 321 is greater than the total ventilation resistance of the vent holes 31 of the second vent hole row 322 and the third vent hole row 323, and the total ventilation resistance is greater for the vent hole rows further outward in the Y-axis direction. This allows the combustion gas to pass 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 vent hole row 322 and the third vent hole row 323, which are located further outward in the Y-axis direction. As a result, the hot plate 3 can be heated evenly over its entire surface.

[0020] During cooking, oils and greases from the food may drip onto the top surface of the hot plate 3, but as described above, the formation of the air vents 31 on the hot plate 3 effectively prevents oils and greases from entering the air vents 31, and this, combined with the prevention of oils and greases from the food from dripping directly onto the flame holes 22 through the air vents 31 in the first air hole row 321, prevents problems such as clogging the flame holes 22. Furthermore, not only can the combustion gas pass through the air vents 31 to come into contact with the food to heat it, but it is also expected to have the effect of washing away oil and salt contained in the food with steam gas.

[0021] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. In the above embodiment, the hot plate 3 has been described as having an arc-shaped cross section that is convex upward, but the cross section of the hot plate 3 can be, for example, a mountain-shaped or trapezoidal shape. In addition, the vent holes 31 have been described as being formed along the lower surface of the cut-and-raised piece 34 of the hot plate 3, but this is not limiting, and the vent holes 31 can be formed, for example, by through holes. In addition, in the above embodiment, the first to third vent hole rows 32 1, The number of ventilation holes 31 in the first to third ventilation hole rows 322, 323 are made to match and aligned in the Y-axis direction, while the opening areas thereof are changed. 1, Although the total airflow resistance of the air holes 31 of the first to third air hole rows 322 and 323 is changed in the above example, the present invention is not limited to this. 1, The number of ventilation holes 31 in each of the first to third ventilation hole rows 32 is changed. 1, The total airflow resistance of the air holes 31 of 322 and 323 can be changed.

[0022] In the above embodiment, the cut-and-raised piece 34 of the hot plate 3 is cut and raised in a bridge shape, and both ends 34a, 34a of the cut-and-raised piece 34 in the X-axis direction are connected to the hot plate 3, but this is not limiting. Referring to Fig. 7, in a gas burner B according to a modified example, the cut-and-raised piece 340 of the hot plate 3 is cut and raised along a U-shaped notch, and both ends 340a, 340a of the cut-and-raised piece 340 in the X-axis direction are spaced apart from the hot plate 3. The vent holes 31 of the first to third vent hole rows 3201, 3202, 3203 are arranged in a staggered pattern. In this case, the first to third vent hole rows 32 1, The vent holes 31 of 322 and 323 may also be aligned in the Y-axis direction.

[0023] In the above embodiment, hydrogen gas is used as the fuel gas, but the present invention is not limited to this 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. Furthermore, the gas burner 2 has been described as having a tubular burner body 21 with a plurality of flame holes 22 formed in the upper part, but the present invention is not limited to this and a flat burner body can be used, for example. [Explanation of symbols]

[0024] H...heating cooker, B...gas burner unit, 2...gas burner, 22...flame hole, 221...hole axis, 222...intersection, 3...heat plate, 31...vent hole, 31a...outer edge of vent hole in Y-axis direction, 32(32 1, 322, 323)...Ventilation hole row, 34, 340...Cut-and-raised piece, 34a, 340a...X-axis direction both ends of the cut-and-raised piece, 34b...Y-axis direction outer edge of the cut-and-raised piece.

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; A gas burner unit characterized in that the total airflow resistance of the vent holes in the innermost vent hole row in the Y-axis direction is set to be greater than the total airflow resistance of the vent holes in the other vent hole rows.

2. 2. The gas burner unit according to claim 1, wherein the total air resistance of the vent holes in each of said vent hole rows is set to be smaller as the vent hole rows move further outward in the Y-axis direction.

3. 3. The gas burner unit according to claim 1, wherein the vent holes are formed along the lower surface of the cut-and-raised piece of the heat plate that is cut and raised upward so as to open outward in the Y-axis direction.

4. 4. The gas burner unit according to claim 3, wherein an outer edge of the cut-and-raised piece in the Y-axis direction is positioned outside an outer edge of the vent hole in the Y-axis direction.

5. 4. The gas burner unit according to claim 3, 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.

6. 3. The gas burner unit according to claim 1, wherein the innermost row of ventilation holes in the Y-axis direction is located outside the Y-axis direction from the intersection of the hole axis extending directly upward from the flame hole and the hot plate.

7. 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 the flame holes to cause diffusion combustion.

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

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