Burner for heating cooker and heating cooker

Abstract

To avoid deterioration of lifting resistance of an ignition burner port 63A opposing to ignition means 8 out of burner ports provided on a distribution chamber outer peripheral wall part 62 due to the small diameter of the distribution chamber outer peripheral wall part 62 in a burner for a heating cooker that includes a burner body 5 having a gas inflow pipe part 52 extending to vertically penetrate through a bottom wall part 51 and a burner cap 6 defining a distribution chamber 61 between the burner cap and the burner body 5 and that can obtain a radial venturi effect of diffusing a gas flow flowing out from an outflow port 523 at an upper end of the gas inflow pipe part 52 in the radial direction by using an opposite plate part 66 opposing to an upper side of the outflow port 523 and sucking primary air from an inflow port 522 at a lower end of the gas inflow pipe part 52.SOLUTION: A barrier part 671 that is located at a portion separated from an ignition burner port 63A to a radial inner side and that interferes with a gas flow flowing from an outflow port 523 toward the ignition burner port 63A is provided in a distribution chamber 61.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a burner for a cooking device that heats an object to be heated placed on a trivet, and a cooking device equipped with this burner. [Background technology]

[0002] Conventionally, as a burner for this type of cooking appliance, for example, as disclosed in Patent Documents 1 and 2, there has been known one which includes a burner body having a bottom wall and a gas inlet pipe extending vertically through the bottom wall, a burner cap placed on the burner body so as to define a distribution chamber communicating with the gas inlet pipe between the burner body and the burner cap, and a nozzle disposed below the gas inlet pipe for injecting fuel gas toward an inlet opening in the lower end face of the gas inlet pipe. In this burner, a plurality of flame holes, including an ignition flame hole facing the ignition means, are provided at intervals in the circumferential direction on the outer peripheral wall of the distribution chamber which extends vertically between the burner body and the burner cap so as to surround the outer periphery of the distribution chamber. The burner body also has an opposing plate portion that faces, across a gap, the outlet opening at the upper end surface of the upper part of the gas inlet pipe, which is the part of the gas inlet pipe that extends above the bottom wall of the burner body, and that diffuses the gas flow flowing out from the outlet in the radial direction, thereby exerting the effect of sucking primary air from the inlet of the gas inlet pipe (the so-called radial Venturi effect).

[0003] In a burner for a cooking appliance, in order to improve the heating efficiency of the object to be heated, it is desirable to reduce the diameter of the outer wall of the distribution chamber so that the flame contacts the bottom center of the object to be heated. However, reducing the diameter of the outer wall of the distribution chamber of the conventional cooker burner reduces the lift resistance. In particular, a reduction in the lift resistance of the ignition flame hole can cause ignition failure. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-225608 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-052947 Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above, the present invention aims to provide a burner for a cooking device that can avoid a decrease in the lift resistance of the ignition flame hole due to a reduction in the diameter of the outer wall of the distribution chamber, and a cooking device equipped with this burner. [Means for solving the problem]

[0006] In order to solve the above problems, the first invention of the present application is a burner for a cooking device that heats an object to be heated placed on a trivet, the burner comprising: a burner body having a bottom wall portion and a gas inlet pipe portion extending vertically through the bottom wall portion; a burner cap placed on the burner body so as to define a distribution chamber communicating with the gas inlet pipe portion between the burner body and the burner cap; and a nozzle disposed below the gas inlet pipe portion for injecting fuel gas toward an inlet opening opening at the lower end face of the gas inlet pipe portion, and an ignition means disposed at intervals in the circumferential direction on an outer peripheral wall portion of the distribution chamber that extends vertically so as to surround the outer periphery of the distribution chamber between the burner body and the burner cap. and a facing plate portion which faces, across a gap, above the outlet opening at the upper end face of the upper part of the gas inlet pipe, which is the part of the gas inlet pipe that extends above the bottom wall of the burner body, and which diffuses the gas flow flowing out from the outlet in the radial direction, thereby exerting the effect of drawing in primary air from the inlet of the gas inlet pipe, characterized in that the distribution chamber is provided with a barrier portion which is located radially outward of the outlet and radially inward from the ignition hole inner peripheral surface, which is the inner peripheral surface of the part of the outer peripheral wall of the distribution chamber where the ignition hole is provided, to interfere with the gas flow from the outlet toward the ignition hole. A second invention of the present application is characterized by including the burner for a cooking appliance according to the first invention.

[0007] According to the present invention (first invention), the barrier portion interferes with the gas flow from the outlet toward the ignition flame hole, so that the gas flow rate ejected from the ignition flame hole can be reduced even if the diameter of the outer wall of the distribution chamber is reduced. Therefore, it is possible to avoid a decrease in the lift resistance of the ignition flame hole due to the reduction in the diameter of the outer wall of the distribution chamber.

[0008] In the present invention, it is also desirable that the barrier portion be provided so that, in a top view, its radially inner end is in contact with, closely facing, or radially inward of the outer peripheral edge of the upper end face of the upper part of the gas inlet pipe. In this way, since the barrier portion is provided radially inward, even if the diameter of the distribution chamber outer peripheral wall portion is reduced, an appropriate space is secured between the barrier portion and the inner peripheral surface of the ignition flame hole for the gas flow that interferes with the barrier portion to turn around, and an excessive decrease in the gas flow rate ejected from the trivet flame hole can be prevented.

[0009] Furthermore, in the present invention, it is desirable that a protrusion extending downward be provided on the underside of the burner cap, spanning between the barrier portion and the inner peripheral surface of the ignition flame hole. This narrows the flow path toward the ignition flame hole, thereby more reliably reducing the flow rate of gas ejected from the ignition flame hole.

[0010] In addition, in the present invention, it is desirable that the barrier portion be provided on one of the burner body and the burner cap, and that an engaged portion with which the barrier portion engages be provided on the other of the burner body and the burner cap. In this way, the burner cap is phased relative to the burner body via the barrier portion and the engaged portion. As a result, the barrier portion is positioned in the same direction as the ignition flame hole, and the gas flow rate ejected from the ignition flame hole can be reliably reduced.

[0011] However, if the ignition flame hole is located between any two of the trivet claws, the gas flow rate ejected from the ignition flame hole will decrease as described above, causing the uniformity of heat distribution between the trivet claws to be lost. Therefore, it is desirable to position the ignition flame hole in the same direction as one of the trivet claws. This will prevent the uniformity of heat distribution between the trivet claws from being lost. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view of a main part of a cooking device equipped with a burner for 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. 4 is a cross-sectional plan view taken along line IV-IV in FIG. 2. [Figure 5] 1A is a perspective view of a burner cap of a burner for a cooking device according to an embodiment, as viewed obliquely from below; FIG. 1B is a perspective view of a burner body of a burner for a cooking device according to an embodiment, as viewed obliquely from above; DETAILED DESCRIPTION OF THE INVENTION

[0013] 1 to 3 show a cooking appliance equipped with a cooking appliance burner A according to an embodiment of the present invention. The cooking appliance has a top plate 2 that covers the top surface of a cooking appliance main body 1. The top plate 2 is composed of a top plate main body 21 and an annular cover plate 22 that covers a burner opening 21a formed in the top plate main body 21 from above. A trivet 3 is arranged on the cover plate 22. The cooking appliance burner A, which heats an object to be heated, such as a cooking container, placed on the trivet 3, is arranged so as to be exposed above the cover plate 22. The trivet 3 has four trivet claws 32 that are erected at 90° intervals on an annular trivet frame 31.

[0014] Four recesses 22a recessed radially inward are formed at 90° intervals on the outer periphery of cover plate 22, and the inner edge of the lower end of each trivet claw 32 engages with each recess 22a to prevent rotation of trivet 3. A cup-shaped burner holder 4 is attached to base 11 fixed to stove body 1 so that its upper end fits within cover plate 22. The inner periphery of cover plate 22 is fastened to flange 41 provided on burner holder 4 with screws 22b.

[0015] The burner A for a cooking appliance includes a burner body 5 supported by a burner holder 4 and a burner cap 6 detachably mounted on the burner body 5. The burner body 5 has a disk-shaped bottom wall 51 and a gas inlet pipe 52 extending vertically through the bottom wall 51. An internal passage 521 of the gas inlet pipe 52 is tapered, gradually decreasing in diameter from an inlet 522 opening at the lower end surface (the lower end surface of the gas inlet pipe 52) of a gas inlet pipe lower portion 52a, which is the portion of the gas inlet pipe 52 extending below the bottom wall 51 of the burner body 5, to an outlet 523 opening at the upper end surface of a gas inlet pipe upper portion 52b, which is the portion of the gas inlet pipe 52 extending above the bottom wall 51 of the burner body 5. The burner body 5 is also provided with a plurality of stepped ribs 53 extending radially outward from the outer peripheral surface of the gas inlet pipe lower portion 52a along the underside of the bottom wall 51. The burner body 5 is supported on the burner holder 4 by these ribs 53 in a rotation-preventing manner.

[0016] Cooker burner A further includes a nozzle 7 disposed below gas inlet pipe portion 52 for injecting fuel gas toward inlet port 522. Nozzle 7 is attached to the downstream end of gas supply pipe 71 inserted and fixed into the center of the bottom of burner holder 4. Cooker burner A is also provided with an ignition electrode 8 as ignition means and a thermocouple 9 for flame detection.

[0017] The burner cap 6 is placed on the burner body 5 so that a distribution chamber 61 communicating with the gas inlet pipe 52 is defined between the burner body 5 and the burner cap 6. A distribution chamber outer peripheral wall 62 extends vertically between the burner body 5 and the burner cap 6 to surround the distribution chamber 61. A plurality of flame holes 63 are provided at intervals in the circumferential direction on the distribution chamber outer peripheral wall 62. Small flame holding holes 64 are also provided on the distribution chamber outer peripheral wall 62, located below and between the flame holes 63. The flame holes 63 include an ignition flame hole 63A facing the ignition electrode 8. This ignition flame hole 63A is located in the same direction as one of the trivet prongs 32. The flame holes 63 also include three trivet flame holes 63B, each located in the same direction as the remaining three trivet prongs 32. The burner cap 6 is formed with a canopy 65 that extends outward to cover the ignition electrode 8 from above.

[0018] In this embodiment, the distribution chamber outer peripheral wall 62 is suspended from the burner cap 6, but the distribution chamber outer peripheral wall 62 may be erected from the burner body 5, or the distribution chamber outer peripheral wall 62 may be divided into two, upper and lower, with the upper half suspended from the burner cap 6 and the lower half erected from the burner body 5. In addition, in this embodiment, the flame holes 63 are formed by holes formed in the distribution chamber outer peripheral wall 62, but grooves may be formed in the distribution chamber outer peripheral wall 62 and the flame holes 63 may be formed by these grooves.

[0019] The burner A for a cooking appliance further has an opposing plate portion 66 that faces the outlet 523 of the gas inlet pipe portion 52 with a gap therebetween. The gas flow that flows out from the outlet 523 hits the opposing plate portion 66 and diffuses in the radial direction. This produces an effect of sucking primary air from the inlet 522 of the gas inlet pipe portion 52 (the so-called radial Venturi effect). In this embodiment, the opposing plate portion 66 is integral with the burner cap 6, but it is also possible to provide the opposing plate portion 66 on the burner body 5 side as described in Patent Document 2 above.

[0020] 4 and 5, distribution chamber 61 is provided with a first barrier portion 671 that interferes with the gas flow from outlet 523 toward ignition flame hole 63A, located radially outward from outlet 523 and radially inward from ignition flame hole inner peripheral surface portion 62a, which is the inner peripheral surface of the portion of distribution chamber outer peripheral wall portion 62 where ignition flame hole 63A is provided. Distribution chamber 61 further is provided with three second barrier portions 672 that interfere with the gas flow from outlet 523 toward trivet flame hole 63B, located radially outward from outlet 523 and radially inward from trivet flame hole inner peripheral surface portion 62b, which is the inner peripheral surface of the portion of distribution chamber outer peripheral wall portion 62 where trivet flame hole 63B is provided, corresponding to the three trivet flame holes 63B.

[0021] To improve the heating efficiency of the object to be heated, it is desirable to reduce the diameter of the distribution chamber outer wall 62. However, if the lift resistance of the ignition flame hole 63A decreases due to the reduction in the diameter of the distribution chamber outer wall 62, this can cause ignition failure. In this embodiment, the first barrier 671 interferes with the gas flow from the outlet 523 toward the ignition flame hole 63A, thereby reducing the gas flow rate from the ignition flame hole 63A even when the diameter of the distribution chamber outer wall 62 is reduced. Therefore, the reduction in the lift resistance of the ignition flame hole 63A due to the reduction in the diameter of the distribution chamber outer wall 62 can be avoided. Furthermore, even if the gas flow rate from the ignition flame hole 63A decreases, the uniformity of the heat distribution between the trivet jaws 32 is not impaired because the ignition flame hole 63A is located in the same direction as one of the trivet jaws 32.

[0022] Furthermore, if the diameter of the distribution chamber outer peripheral wall portion 62 is reduced, the ignition flame hole inner peripheral surface portion 62a may come too close to the first barrier portion 671, excessively reducing the gas flow rate ejected from the ignition flame hole 63A and potentially resulting in poor ignition. Therefore, in this embodiment, the first barrier portion 671 is provided so that, in a top view, the radially inner end of the first barrier portion 671 closely faces the outer peripheral edge of the upper end surface of the gas inlet pipe upper portion 52b. This provides the first barrier portion 671 radially inward, ensuring an appropriate amount of space between the first barrier portion 671 and the ignition flame hole inner peripheral surface portion 62a for the gas flow that interferes with the first barrier portion 671 to flow around, even if the diameter of the distribution chamber outer peripheral wall portion 62 is reduced. This prevents the gas flow rate ejected from the ignition flame hole 63A from excessively reducing.

[0023] The second barrier portion 672 is also provided so that its radially inner end faces closely to the outer circumferential edge of the upper end surface of the gas inlet pipe upper portion 52 b in top view. Note that the first and second barrier portions 671, 672 may be provided so that their radially inner ends contact the outer circumferential edge of the upper end surface of the gas inlet pipe upper portion 52 b or are located radially inward from the outer circumferential edge in top view.

[0024] Furthermore, in this embodiment, a downwardly extending protrusion 68 is provided on the underside of the burner cap 6 between the first barrier portion 671 and the ignition flame hole inner peripheral surface portion 62a. This narrows the flow path toward the ignition flame hole 63A, making it possible to more reliably reduce the flow rate of gas ejected from the ignition flame hole 63A.

[0025] Furthermore, when the combustion flame of the gas ejected from the trivet flame hole 63B (hereinafter referred to as the trivet flame hole flame) comes into contact with the trivet claw 32, CO is generated. In this embodiment, the second barrier portion 672 interferes with the gas flow from the outlet 523 toward the trivet flame hole 63B, thereby reducing the amount of gas ejected from the trivet flame hole 63B. This shortens the trivet flame hole flame, thereby suppressing the generation of CO when the trivet flame hole flame comes into contact with the trivet claw 32. Furthermore, since the gas flow rate ejected from the ignition flame hole 63A located in the same direction as one trivet claw 32 is also reduced by the first barrier portion 671 as described above, the generation of CO when the combustion flame of the gas ejected from the ignition flame hole 63A comes into contact with the trivet claw 32 can also be suppressed.

[0026] Furthermore, in this embodiment, the first and second barrier portions 671, 672 are provided on the burner cap 6, and the first and second engaged portions 541, 542 with which the first and second barrier portions 671, 672 engage are provided on the burner body 5, which does not have these barrier portions 671, 672. As a result, the burner cap 6 is phased relative to the burner body 5 via the first and second barrier portions 671, 672 and the first and second engaged portions 541, 542. As a result, the first barrier portion 671 is positioned in the same direction as the ignition flame hole 63A, i.e., the ignition electrode 8, and the second barrier portions 672 are positioned in the same direction as the trivet flame hole 63B, i.e., the trivet claws 32, thereby reliably reducing the flow rate of gas ejected from the ignition flame hole 63A and the trivet flame hole 63B.

[0027] More specifically, the burner body 5 is provided with four protrusions 55 protruding outward from the outer peripheral surface of the gas inlet pipe upper portion 52b at intervals in the circumferential direction, and a first engaged portion 541 is formed at a predetermined circumferential interval between these protrusions 55, with which a first barrier portion 671 engages. Three second engaged portions 542 are formed at the remaining three circumferential intervals between these protrusions 55, with which three second barrier portions 672 engage, respectively. The circumferential widths of the first barrier portion 671 and the first engaged portion 541 are wider than the circumferential widths of the second barrier portion 672 and the second engaged portion 542. The phase in which the first barrier portion 671 matches the first engaged portion 541 is the phase in which the first barrier portion 671 is aligned with the ignition electrode 8, and the burner cap 6 can be placed on the burner body 5 only in this phase.

[0028] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above embodiment, the number of trivet claws 32 is four, but it may be other than four. Furthermore, in the above embodiment, the first and second engaged portions 541, 542 are defined by the spacing between the protrusions 55 protruding from the outer peripheral surface of the gas inlet pipe upper portion 52b. However, it is also possible to form grooves on the outer peripheral surface of the gas inlet pipe upper portion 52b and define the engaged portions 541, 542 using these grooves. Furthermore, in the above embodiment, the first and second barrier portions 671, 672 are provided on the burner cap 6 and the first and second engaged portions 541, 542 are provided on the burner body 5. However, it is also possible to provide the engaged portions 541, 542 on the burner cap 6 and the barrier portions 671, 672 on the burner body 5. Note that the second barrier portion 672 and the second engaged portion 542 are not essential. Furthermore, when a plurality of ignition flame holes 63A are provided, the first barrier portion 671 may be provided in accordance with the ignition flame hole 63A that is closer to the center of the plurality of ignition flame holes 63A. [Explanation of symbols]

[0029] A...burner for cooking appliance, 3...trivet, 32...trivet claw, 5...burner body, 51...bottom wall portion, 52...gas inlet pipe portion, 52b...upper part of gas inlet pipe, 522...inlet, 523...outlet, 541...first engaged portion (engaged portion), 6...burner cap, 61...distribution chamber, 62...distribution chamber outer wall portion, 62a...inner surface portion of ignition flame hole, 63...flame hole, 63A...ignition flame hole, 66...opposing plate portion, 671...first barrier portion (barrier portion), 68...protrusion, 7...nozzle.

Claims

1. A burner for a cooking appliance that heats an object to be heated placed on a trivet, a burner body having a bottom wall and a gas inlet pipe extending through the bottom wall in the up-down direction; a burner cap placed on the burner body so as to define a distribution chamber communicating with the gas inlet pipe between the burner body and the burner cap; and a nozzle disposed below the gas inlet pipe for injecting fuel gas toward an inlet opening opening in a lower end surface of the gas inlet pipe, Between the burner body and the burner cap, a distribution chamber outer peripheral wall portion extending in the vertical direction so as to surround the outer periphery of the distribution chamber is provided with a plurality of flame holes at intervals in the circumferential direction, including an ignition flame hole facing the ignition means; a counter plate portion that faces, with a gap therebetween, an outlet opening on the upper end surface of the upper part of the gas inlet pipe, which is a part of the gas inlet pipe extending above the bottom wall portion of the burner body, and that diffuses the gas flow flowing out from the outlet in the radial direction, thereby exerting the effect of drawing in primary air from the inlet of the gas inlet pipe, A burner for a heating cooker, characterized in that a barrier portion is provided in the distribution chamber, positioned radially outward from the outlet and radially inward from the inner peripheral surface of the ignition flame hole, which is the inner surface of the part of the outer wall of the distribution chamber where the ignition flame hole is provided, to interfere with the gas flow from the outlet toward the ignition flame hole.

2. 2. The burner for a heating cooker according to claim 1, wherein the barrier portion is arranged so that, when viewed from above, the radially inner end of the barrier portion is in contact with or closely opposed to the outer peripheral edge of the upper end surface of the upper part of the gas inlet pipe, or is located radially inward of the outer peripheral edge.

3. 3. The burner for a cooking appliance according to claim 1, wherein a protrusion extending downward is provided on the underside of the burner cap between the barrier portion and the inner peripheral surface of the ignition flame hole.

4. A burner for a heating cooker as described in claim 1 or 2, characterized in that the barrier portion is provided on one of the burner body and the burner cap, and an engaging portion with which the barrier portion engages is provided on the other of the burner body and the burner cap.

5. 3. The burner for a cooking appliance according to claim 1, wherein the ignition flame hole is positioned in the same direction as one of the trivet claws provided on the trivet.

6. A cooking device comprising the burner for cooking devices according to claim 1 or 2.

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