Burner for heating cooker, and heating cooker

Abstract

This burner for a heating cooker comprises a burner body 5 having a gas inflow pipe part 52 extending vertically through a bottom wall part 51, and a burner cap 6 for defining a distribution chamber 61 between the burner body 5 and the burner cap 6, the burner being such that a gas flow that flows out from an outflow port 523 at an upper end of the gas inflow pipe part 52 is diffused in a radial direction by a facing plate part 66 facing an upper section of the outflow port 523, and a radial Venturi effect for suctioning primary air through an inflow port 522 at a lower end of the gas inflow pipe part 52 can be obtained, wherein it is possible, by reducing the diameter of a distribution-chamber outer peripheral wall part 62, to avoid any reduction in the lift resistance of an ignition flame hole 63A facing an ignition means 8 among flame holes provided in the distribution-chamber outer peripheral wall part 62.　The distribution chamber 61 is provided with a barrier part 671 that is positioned at a portion radially inward from the ignition flame hole 63A and that interferes with a gas flow from the outflow port 523 toward the ignition 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, including an ignition flame hole facing the ignition means, are provided at intervals in the circumferential direction on an outer peripheral wall of the distribution chamber extending 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.

[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 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.

[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 counter plate portion facing, across a gap, above an outlet opening at the upper end face of the upper part of the gas inlet pipe, which is a part of the gas inlet pipe extending above the bottom wall of the burner body, and which diffuses the gas flow flowing out from the outlet in the radial direction and exerts the effect of drawing primary air through the inlet of the gas inlet pipe, wherein the distribution chamber is provided with a barrier portion positioned radially outward from 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, for interfering with the gas flow from the outlet toward the ignition hole.

[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, the barrier portion is preferably provided so that, in a top view, its radially inner end is in contact with, closely facing, or radially inward of the outer circumferential edge of the upper end surface of the gas inlet pipe. This positions the barrier portion radially inward. Therefore, even if the diameter of the distribution chamber outer wall is reduced, an adequate space is secured between the barrier portion and the inner circumferential surface of the ignition 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 ignition 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 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 on the trivet. This will prevent the uniformity of heat distribution between the trivet claws from being lost.

[0012] 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.

[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 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.

[0014] 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.

[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 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.

[0016] 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 as an 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 circumferential intervals on the distribution chamber outer peripheral wall 62. The distribution chamber outer peripheral wall 62 also has small flame holding holes 64 located below 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 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 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.

[0020] 4 and 5, the distribution chamber 61 is provided with a first barrier portion 67 which is positioned radially outward from the outlet 523 and radially inward from an ignition hole inner peripheral surface portion 62a, which is the inner peripheral surface of a portion of the distribution chamber outer peripheral wall portion 62 where the ignition hole 63A is provided, and which interferes with the gas flow from the outlet 523 toward the ignition hole 63A. １ The distribution chamber 61 further includes a second barrier portion 67 that is positioned radially outward from the outlet 523 and radially inward from a trivet flame hole inner peripheral surface portion 62b, which is the inner peripheral surface of the portion of the distribution chamber outer peripheral wall portion 62 where the trivet flame hole 63B is provided, and that interferes with the gas flow from the outlet 523 toward the trivet flame hole 63B. ２ There are three of these provided to match the three trivet flame holes 63B.

[0021] In order 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 diameter of the distribution chamber outer wall 62 is reduced, the lift resistance of the ignition flame hole 63A decreases, which can cause ignition failure. Here, in this embodiment, the first barrier portion 67 is provided in the gas flow from the outlet 523 toward the ignition flame hole 63A. １ By interfering with each other, it is possible to reduce the gas flow rate ejected from the ignition flame hole 63A even if the diameter of the distribution chamber outer peripheral wall 62 is reduced. Therefore, it is possible to avoid a decrease in the lift resistance of the ignition flame hole 63A due to the reduction in the diameter of the distribution chamber outer peripheral wall 62. Furthermore, even if the gas flow rate ejected from the ignition flame hole 63A is reduced, the ignition flame hole 63A is located in the same direction as one of the trivet claws 32, so the uniformity of the heat distribution between the trivet claws 32 is not impaired.

[0022] Furthermore, if the diameter of the distribution chamber outer wall portion 62 is reduced, the inner peripheral surface portion 62a of the ignition flame hole comes too close to the first barrier portion 671, which may cause an excessive decrease in the flow rate of gas ejected from the ignition flame hole 63A, resulting in poor ignition. １ When viewed from above, the first barrier portion 67 １ The first barrier portion 67 is provided so that its radially inner end faces closely the outer circumferential edge of the upper end surface of the gas inlet pipe upper portion 52b. １ Therefore, even if the diameter of the distribution chamber outer peripheral wall portion 62 is reduced, the first barrier portion 67 １ and the ignition flame hole inner peripheral surface portion 62a, a first barrier portion 67 １ As a result, an excessive decrease in the flow rate of gas ejected from the ignition flame hole 63A can be prevented.

[0023] Second barrier portion 67 ２ Also, when viewed from above, the second barrier portion 67 ２ The first and second barrier portions 67 are provided so that their radially inner ends are closely opposed to the outer circumferential edge of the upper end surface of the gas inlet pipe upper portion 52b. １ , 67 ２ When viewed from above, each barrier portion 67 １ , 67 ２ The radially inner end of the gas inlet pipe 52 may be in contact with the outer periphery of the upper end surface of the gas inlet pipe upper portion 52b or may be located radially inward of the outer periphery.

[0024] In this embodiment, a first barrier portion 67 is provided on the lower surface of the burner cap 6. １ and the inner peripheral surface 62a of the ignition flame hole 63A, a downwardly extending protrusion 68 is vertically provided. This narrows the flow path toward the ignition flame hole 63A, making it possible to more reliably reduce the amount of gas ejected from the ignition flame hole 63A.

[0025] In addition, 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, a second barrier portion 67 is provided to block the gas flow from the outlet 523 toward the trivet flame hole 63B. ２The interference of the first barrier portion 67 reduces the gas flow rate ejected from the trivet flame hole 63B. Therefore, the trivet flame hole flame is shortened, and the generation of CO caused by the trivet flame hole flame coming into contact with the trivet claw 32 can be suppressed. In addition, 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 interference of the first barrier portion 67 as described above. １ This reduces the amount of CO generated when the combustion flame of the gas ejected from the ignition flame hole 63A comes into contact with the trivet claw 32, and also reduces the amount of CO generated.

[0026] Furthermore, in this embodiment, the first and second barrier portions 67 １ , 67 ２ are provided on the burner cap 6, and these barrier portions 67 １ , 67 ２ The first and second barrier portions 67 are provided on the burner body 5 which does not have the １ , 67 ２ The first and second engaged portions 54 engage with each other. １ , 54 ２ As a result, the burner cap 6 is provided with the first and second barrier portions 67 relative to the burner body 5. １ , 67 ２ and the first and second engaged portions 54 １ , 54 ２ As a result, the first barrier portion 67 １ The second barrier portions 67 are in the same direction as the ignition flame hole 63A, i.e., the ignition electrode 8. ２ is positioned so as to be in the same direction as the trivet flame hole 63B, i.e., the trivet claw 32, and the flow rate of gas ejected from the ignition flame hole 63A and the trivet flame hole 63B can be reliably reduced.

[0027] More specifically, the burner body 5 is provided with four convex portions 55 protruding outward from the outer peripheral surface of the gas inlet pipe upper portion 52b at intervals in the circumferential direction, and the first barrier portions 67 are provided at predetermined intervals in the circumferential direction between these convex portions 55. １ The first engaged portion 54 １ and three second barrier portions 67 are formed at the remaining three circumferential intervals between these protrusions 55. ２ The three second engaged portions 54 engage with the respective ２ The first barrier portion 67 １ and the first engaged portion 54１ The circumferential width of the second barrier portion 67 ２ and the second engaged portion 54 ２ The circumferential width of the first engaged portion 54 is wider than that of the first engaged portion 54. １ First barrier portion 67 １ The phase where these match is the first barrier portion 67 １ is the phase in which the ignition electrode 8 is in the same direction as the ignition electrode 8, and the burner cap 6 can be placed on the burner body 5 only in this phase.

[0028] Although the embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited to this. For example, in the above embodiment, the number of trivet claws 32 is four, but it may be other than four. Also, in the above embodiment, the first and second engaged portions 54 are spaced apart by the interval between the protrusions 55 protruding from the outer circumferential surface of the gas inlet pipe upper portion 52b. １ , 54 ２ A groove is formed on the outer peripheral surface of the gas inlet pipe upper portion 52b, and the groove is used to connect the engaged portions 54 １ , 54 ２ Furthermore, in the above embodiment, the first and second barrier portions 67 are provided on the burner cap 6. １ , 67 ２ , the first and second engaged portions 54 on the burner body 5 １ , 54 ２ The burner cap 6 is provided with the engaged portions 54 １ , 54 ２ , the burner body 5 has the barrier portions 67 １ , 67 ２ It is also possible to provide the second barrier portion 67. ２ and the second engaged portion 54 ２ In addition, when a plurality of ignition flame holes 63A are provided, the first barrier portion 67 is provided in accordance with the ignition flame hole 63A closer to the center among the plurality of ignition flame holes 63A. １ It is sufficient to set it as follows.

[0029] A...burner for heating cooker, 3...trivet, 32...trivet claws, 5...burner body, 51...bottom wall portion, 52...gas inlet pipe portion, 52b...upper portion of gas inlet pipe, 522...inlet port, 523...outlet port, 54 １...First engaged part (engaged part), 6...Burner cap, 61...Distribution chamber, 62...Distribution chamber outer circumferential wall part, 62a...Ignition flame hole inner circumferential surface part, 63...flame hole, 63A...Ignition flame hole, 66...opposite plate part, 67 １ ...first barrier portion (barrier portion), 68...protrusion, 7...nozzle.

Claims

1. A burner for a cooking device that heats an object to be heated 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 communicating with the gas inlet pipe is defined between the burner body and the burner cap; and a nozzle arranged below the gas inlet pipe for injecting fuel gas toward an inlet opening at the lower end face of the gas inlet pipe; between the burner body and the burner cap, 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 that extends vertically to surround the outer periphery of the distribution chamber; and an opposing plate portion that faces, with a gap, above an 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 that diffuses the gas flow flowing 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 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. 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 provided on the underside of the burner cap, spanning between the barrier portion and the inner surface portion 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. A burner for a cooking appliance according to claim 1 or 2, characterized in that the ignition flame hole is located 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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