Burner for heating cooker and heating cooker

Abstract

Provided is a burner for a heating cooker, said burner comprising: a burner body 5 that has a gas inflow pipe part 52 extending vertically through a bottom wall part 51; and a burner cap 6 that defines a distribution chamber 61 between the burner cap and the burner body 5. The burner is configured so that a radial venturi effect can be obtained in which a gas flow flowing out from an outflow port 523 at an upper end of the gas inflow pipe part 52 is diffused in a radial direction by an opposing plate part 66 that opposes an upper part of the outflow port 523, and primary air is sucked in from an inflow port 522 at a lower end of the gas inflow pipe part 52. A flame of a trivet flame hole can be shortened without reducing an opening area of a trivet flame hole 63A positioned in the same direction as a trivet claw 32 among flame holes provided in a distribution chamber outer peripheral wall part 62.　The distribution chamber 61 is provided with a barrier part 67 that is positioned at a portion separated radially inward from the trivet flame hole 63A, and that interferes with the gas flow from the outflow port 523 toward the trivet flame hole 63A.

Description

Burner for heating cooker and heating cooker

[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.

[0002] Conventionally, as disclosed in Patent Documents 1 and 2, a burner for a cooking appliance of this type 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 are provided at intervals in the circumferential direction on the outer peripheral wall of the distribution chamber extending vertically so as to surround the outer periphery of the distribution chamber between the burner body and the burner cap, including a trivet flame hole positioned in the same direction as a trivet claw provided on the trivet. 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 the conventional cooker burner described above, the opening area of ​​the trivet flame hole is made small to shorten the trivet flame hole flame in order to reduce CO2 emissions generated when the combustion flame of the gas ejected from the trivet flame hole (hereinafter referred to as the trivet flame hole flame) comes into contact with the trivet claw. However, if the opening area of ​​the trivet flame hole is made too small, the trivet flame hole becomes easily clogged with boil-over when boil-over occurs.

[0004] JP 2012-225608 A JP 2011-052947 A

[0005] In view of the above, the present invention aims to provide a burner for a cooking appliance that can shorten the trivet flame hole flame without reducing the opening area of ​​the trivet flame hole, and a cooking appliance equipped with this burner.

[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 that is placed on a trivet, and includes a burner body having a bottom wall portion and a gas inlet pipe portion that extends vertically through the bottom wall portion, a burner cap that is placed on the burner body so that a distribution chamber that communicates with the gas inlet pipe portion is defined between the burner body and the burner cap, and a nozzle that is placed below the gas inlet pipe portion and that injects fuel gas toward an inlet opening that opens into the lower end face of the gas inlet pipe portion, and a trivet that is provided on the trivet 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. The burner body has a plurality of burner holes including a trivet burner hole positioned at the same position as the claws, and a counter plate portion facing, across a gap, above an outlet opening at the upper end surface of the upper gas inlet pipe, which is a part of the gas inlet pipe that extends above the bottom wall portion of the burner body, and which diffuses the gas flow flowing out from the outlet port in the radial direction and exerts the effect of drawing primary air through the inlet port of the gas inlet pipe, wherein the distribution chamber has a barrier portion positioned radially outward from the outlet port and radially inward from the inner peripheral surface of the trivet burner hole, which is the inner peripheral surface of the part of the outer peripheral wall of the distribution chamber where the trivet burner hole is provided.

[0007] According to this invention (first invention), the barrier portion interferes with the gas flow from the outlet toward the trivet flame hole, thereby reducing the amount of gas ejected from the trivet flame hole. Therefore, the trivet flame hole flame can be shortened without reducing the trivet flame hole opening area, reducing the generation of CO2 due to the trivet flame hole touching the trivet claw. Furthermore, because the trivet flame hole opening area does not need to be reduced, clogging of the trivet flame hole due to boil-over can also be suppressed.

[0008] In addition, in the present invention, it is desirable that the barrier portion be disposed so that, in a top view, its radially inner end is in contact with, closely facing, or radially inward of the outer periphery of the upper end surface of the gas inlet pipe. This positions the barrier portion radially inward. Therefore, even if the diameter of the outer wall portion of the distribution chamber is reduced to improve heating efficiency, as described below, a suitable amount of space is secured between the barrier portion and the inner periphery of the trivet flame hole for the gas flow that interferes with the barrier portion to flow around. As a result, 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 trivet flame hole. This narrows the flow path toward the trivet flame hole, thereby more reliably reducing the amount of gas ejected from the trivet 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 so as to be in the same direction as the trivet flame hole, and the flow rate of gas ejected from the trivet flame hole can be reliably reduced.

[0011] 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. It is a cross-sectional side view taken along line II-II in Fig. 1. It is a cross-sectional front view taken along line III-III in Fig. 2. It is a cross-sectional plan view taken along line IV-IV in Fig. 2. (a) is a perspective view of a burner cap of the burner for a cooking device according to an embodiment, as seen obliquely from below, and (b) is a perspective view of a burner body of the burner for a cooking device according to an embodiment, as seen obliquely from above.

[0012] 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 in the top plate main body 21 from above. A trivet 3 is disposed 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 disposed 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.

[0013] Four radially inward recesses 22a are formed at 90° intervals on the outer periphery of the cover plate 22. The inner edge of the lower end of each trivet claw 32 engages with each recess 22a, preventing the trivet 3 from rotating. A cup-shaped burner holder 4 is attached to a base 11 fixed to the stove body 1 so that its upper end fits within the cover plate 22. The inner periphery of the cover plate 22 is fastened to a flange 41 provided on the burner holder 4 with screws 22b.

[0014] 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 lower surface 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.

[0015] The cooker burner A further includes a nozzle 7 disposed below the gas inlet pipe 52 for injecting fuel gas toward the inlet 522. The nozzle 7 is attached to the downstream end of a gas supply pipe 71 inserted and fixed into the center of the bottom of the burner holder 4. The cooker burner A is also provided with an ignition electrode 8 and a thermocouple 9 for flame detection.

[0016] 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 four trivet flame holes 63A, each located at the same position as the four trivet claws 32. One of the trivet flame holes 63A also serves as an ignition flame hole facing the ignition electrode 8. The burner cap 6 also has a canopy 65 that extends outward and covers the ignition electrode 8 from above.

[0017] 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.

[0018] The cooker burner A further has an opposing plate 66 that faces the outlet 523 of the gas inlet pipe 52 with a gap therebetween. The gas flow flowing out from the outlet 523 hits the opposing plate 66 and diffuses in the radial direction. This produces an effect of drawing primary air through the inlet 522 of the gas inlet pipe 52 (the so-called radial Venturi effect). In this embodiment, the opposing plate 66 is integral with the burner cap 6, but it is also possible to provide the opposing plate 66 on the burner body 5 side as described in Patent Document 2.

[0019] Referring also to Figures 4 and 5, in the distribution chamber 61, four barrier sections 67 that interfere with the gas flow from the outlet 523 toward the trivet flame holes 63A are provided, corresponding to the four trivet flame holes 63A. These barrier sections 67 are located radially outward from the outlet 523 and radially inward from the trivet flame hole inner peripheral surface section 62a, which is the inner peripheral surface of the part of the distribution chamber outer peripheral wall section 62 where the trivet flame holes 63A are provided.

[0020] This allows the barrier portion 67 to interfere with the gas flow from the outlet 523 toward the trivet flame hole 63A, thereby reducing the amount of gas spraying out from the trivet flame hole 63A. Therefore, the trivet flame hole flame can be shortened without reducing the opening area of ​​the trivet flame hole 63A, reducing the generation of CO caused by the trivet flame hole flame coming into contact with the trivet claws 32. Furthermore, because the opening area of ​​the trivet flame hole 63A does not need to be reduced, clogging of the trivet flame hole 63A due to boil-over can also be prevented.

[0021] To improve the heating efficiency of the heated object, it is desirable to reduce the diameter of the distribution chamber outer wall 62 so that the flame contacts the bottom surface of the heated object closer to the center. However, if the diameter of the distribution chamber outer wall 62 is reduced, the trivet flame hole inner surface 62a may become too close to the barrier 67, excessively reducing the gas flow rate ejected from the trivet flame hole 63A and deteriorating the flame transfer performance of the trivet flame hole 63A. Therefore, in this embodiment, the barrier 67 is arranged so that, when viewed from above, its radially inner end faces the outer edge of the upper end surface of the gas inlet pipe upper portion 52b. This positions the barrier 67 radially inward. Therefore, even if the diameter of the distribution chamber outer wall 62 is reduced, an appropriate amount of space is secured between the barrier 67 and the trivet flame hole inner surface 62a to allow the gas flow that interferes with the barrier 67 to flow around. As a result, it is possible to prevent an excessive decrease in the flow rate of gas ejected from the trivet flame hole 63A. The barrier portion 67 may be provided so that, when viewed from above, the radially inner end of the barrier portion 67 is in contact with the outer circumferential edge of the upper end surface of the gas inlet pipe upper portion 52b or is located radially inward of the outer circumferential edge.

[0022] In this embodiment, a downwardly extending protrusion 68 is provided between the barrier portion 67 and the trivet flame hole inner peripheral surface portion 62a on the underside of the burner cap 6. This narrows the flow path toward the trivet flame hole 63A, making it possible to more reliably reduce the flow rate of gas ejected from the trivet flame hole 63A.

[0023] Furthermore, in this embodiment, a barrier portion 67 is provided on the burner cap 6, and an engaged portion 54 with which the barrier portion 67 engages is provided on the burner body 5, which does not have the barrier portion 67. Specifically, four convex portions 55 are provided on the burner body 5 at intervals in the circumferential direction, protruding outward from the outer peripheral surface of the gas inlet pipe upper portion 52b, and four engaged portions 54 are formed with which the four barrier portions 67 engage, respectively, at four circumferential intervals between these convex portions 55. By providing the engaged portions 54 on the burner body 5 in this manner, the burner cap 6 is phased relative to the burner body 5 via the barrier portion 67 and the engaged portions 54. As a result, the barrier portion 67 is positioned so as to be in the same direction as the trivet flame hole 63A, and the gas flow rate ejected from the trivet flame hole 63A can be reliably reduced.

[0024] Furthermore, the #1 barrier portion 67, which interferes with the gas flow toward the trivet flame hole 63A that also serves as an ignition flame hole, has a wider circumferential width than the other barrier portions 67, and the #1 engaged portion 54 with which the #1 barrier portion 67 engages also has a wider circumferential width than the other engaged portions 54. Therefore, each barrier portion 67 can engage with the corresponding predetermined engaged portion 54 only when the burner cap 6 is in a predetermined phase with respect to the burner body 5 where the #1 barrier portion 67 matches the #1 engaged portion 54.

[0025] Although the above embodiment of the present invention has been described 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 engaging portions 54 are defined by the spacing between the protrusions 55 protruding from the outer peripheral surface of the upper gas inlet pipe 52b. However, it is also possible to form grooves on the outer peripheral surface of the upper gas inlet pipe 52b and define the engaging portions 54 using these grooves. Furthermore, in the above embodiment, the barrier portion 67 is provided on the burner cap 6 and the engaging portions 54 are provided on the burner body 5. However, it is also possible to provide the engaging portions 54 on the burner cap 6 and the barrier portion 67 on the burner body 5. Furthermore, if the trivet claws 32 have a wide circumferential width and multiple trivet flame holes 63A are provided corresponding to one trivet claw 32, the barrier portion 67 may be provided to match the trivet flame holes 63A that are closer to the center of the multiple trivet flame holes 63A.

[0026] 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 port, 523...outlet port, 54...engagement portion, 6...burner cap, 61...distribution chamber, 62...distribution chamber outer wall portion, 62a...trivet flame hole inner surface portion, 63...flame hole, 63A...trivet flame hole, 66...opposing plate portion, 67...barrier portion, 68...rib, 7...nozzle.

Claims

1. A burner for a cooking device that heats an object to be heated that is placed on a trivet, comprising: 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 that a distribution chamber that communicates with the gas inlet pipe is defined between the burner body and the burner cap; and a nozzle that is placed below the gas inlet pipe and sprays fuel gas toward an inlet opening that opens into the lower end face of the gas inlet pipe; between the burner body and the burner cap, on the outer wall of the distribution chamber that extends vertically to surround the outer periphery of the distribution chamber, a plurality of flame holes are provided at intervals in the circumferential direction, including a trivet flame hole that is located in the same direction as the trivet claws provided on the trivet; and an opposing plate that faces, with a gap, above an outlet opening into 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 that diffuses the gas flow that flows out from the outlet in the radial direction, thereby exerting the effect of drawing primary air through 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 trivet flame hole, which is the inner surface of the part of the outer wall of the distribution chamber where the trivet flame hole is provided, to interfere with the gas flow from the outlet toward the trivet flame hole.

2. A burner for a heating cooker as described in claim 1, characterized in that 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. A burner for a heating cooker as described in claim 1 or 2, characterized in that a protrusion extending downward is attached to the underside of the burner cap, spanning between the barrier portion and the inner surface portion of the trivet 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. A cooking device comprising the burner for cooking devices according to claim 1 or 2.

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