JP2008202866A - Burner for cooking stove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably perform combustion without lifting even in a high frame state, in a burner for a cooking stove comprising a cylindrical body made of sheet metal on an outer periphery of a burner head, and jetting and burning an air-fuel mixture from burner ports formed on the cylindrical body. <P>SOLUTION: Slit-shaped main burner ports 64 long in the vertical direction, and sub-burner ports 65 positioned at a lower side of the main burner ports 64 are formed on the cylindrical body 62 excluding a plurality of parts in the circumferential direction of the same azimuth as a plurality of trivet claws disposed on a trivet. Only trivet burner ports 68 smaller than the main burner ports 64 are formed on the parts of the cylindrical body 62 positioned on the same azimuth as the trivet claws. Resistors 69 for limiting the flow of the air-fuel mixture directing to the trivet burner ports 68 are disposed in the burner head. The lifting is suppressed by mutual interference of the flame of the main burner ports 64 and the flame of the sub-burner ports 65. The air-fuel mixture is decelerated by the resistors 69 before reaching the trivet burner ports 68, thus the lifting of the flame of the trivet burner ports 68 is suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a stove burner including a burner head having an annular inner space to which an air-fuel mixture is supplied.

  Conventionally, in this kind of stove burner, the burner head is generally constituted by a cast or forged product of a metal such as brass. A plurality of flame holes are formed in the circumferential wall portion of the outer periphery of the burner head with a circumferential interval, and the air-fuel mixture supplied to the internal space of the burner head is ejected from these flame holes and burned. Yes.

  Here, it is necessary to narrow the width of the flame hole in order to prevent backfire that is likely to occur in a low heat state. However, in a burner head made of a conventional cast or forged product, the peripheral wall forming the flame hole is relatively thick and the flame hole length in the burner radial direction is long. The passage resistance of the hole becomes excessive. As a result, the internal pressure of the burner becomes high, resulting in poor primary air suction. Therefore, the width of the flame hole cannot be reduced so much. For this reason, backfire is likely to occur in a low heat state, and it becomes difficult to ensure a wide range of thermal power control.

  As a stove burner in which such a problem has been eliminated, a conventional burner head is provided with a sheet metal tubular body on the outer periphery of the burner head, and a longitudinal slit-like flame hole is formed in the tubular body in the vertical direction. (For example, refer to Patent Document 1). According to this, the flame hole length in the burner radial direction becomes extremely short. Therefore, even if the flame hole width is considerably narrow, the passage resistance of the flame hole does not become so large, and the primary air is sucked well. Moreover, in this thing, the slit-shaped flame hole formed in the other part in the circumferential direction several places of the cylindrical body located in the same direction as the several virtues claw provided in the virtues placed in the top plate of the stove A smaller flame hole is formed. Thereby, it is possible to prevent the flame from touching the five virtue claws and causing poor combustion.

By the way, the flame hole formed in the cylindrical body made of sheet metal has a low passage resistance. Therefore, in a strong fire state, the jet speed of the air-fuel mixture becomes too fast and the flame lift tends to occur. Therefore, even if the backfire in the low fire state can be prevented, there is a problem that the combustion becomes unstable in the high fire state.
JP 2000-205518 A

  In view of the above points, the present invention has an object to provide a burner for a stove that can prevent backfire in a low-fire condition and can perform stable combustion without causing lift even in a high-fire condition. .

  The present invention is a burner for a stove including a burner head having an annular inner space to which an air-fuel mixture is supplied, the burner head having a cylindrical body made of sheet metal on the outer periphery, and a flame hole formed in the cylindrical body In order to solve the above-mentioned problem, a plurality of circumferential directions in the same direction as a plurality of five virtue claws provided in the five virtue placed on the top plate of the stove are provided on the cylindrical body. Except, a slit-shaped main flame hole that is long in the vertical direction and a sub-flame hole that is located below the main flame hole and that is smaller than the main flame hole are formed. A small virtue hole smaller than the main flame hole is formed, and a resistor for restricting the flow of the air-fuel mixture toward the virtue flame hole is provided in the burner head.

  According to the present invention, since the length of each flame hole in the burner radial direction is extremely short as in the above-described conventional example, the passage resistance of the flame hole is not so large even if the flame hole width is considerably narrowed. Air is sucked in well. Therefore, it is possible to prevent backfire in a low fire state without causing a combustion failure due to insufficient primary air. In addition, since a secondary flame hole is formed under the main flame hole, even if the gas mixture injection speed increases in a strong fire state, lift occurs due to mutual interference between the flame of the main flame hole and the flame of the auxiliary flame hole. Is suppressed.

  On the other hand, in the circumferential direction place of the same orientation as the virtuosity claw of the cylindrical body, a secondary flame hole cannot be formed under the virtuosity flame hole in order to prevent the flame from becoming large and touching the virtuosity nail. Therefore, the flame lift of the five virtue flame holes cannot be suppressed by the mutual interference of the flames. However, in the present invention, the air-fuel mixture is decelerated by the resistor provided in the burner head before reaching the five virtue flame holes. Accordingly, it is possible to suppress the flame lift of the five virtue flame holes. As a result, the heating power of the burner can be adjusted over a wide range without causing flashback or lift.

  With reference to FIG. 1, 1 is a stove body, 2 is a top plate that covers the upper surface of the stove body 1, and 3 is a burner for the stove. The top plate 2 is provided with a burner opening 2a. On the top plate 2, five virtues having a plurality of five virtue claws not shown so as to surround the burner opening 2 a are placed. Then, the object to be heated placed on the five virtues is heated by the burner 3.

  1 and 2, the burner 3 is inserted into the mixing tube 4 installed in the stove body 1 and the burner opening 2 a of the top plate 2 formed integrally with the downstream end of the mixing tube 4. The burner body 5 is composed of a burner body 6 and a burner head 6 detachably mounted on the burner body 5. Further, the burner 3 is provided with an ignition plug 7 and a pan bottom temperature sensor 8 that comes into contact with the bottom surface of the cooking container that is an object to be heated and detects its temperature. Furthermore, a cover ring 9 that closes the gap is extrapolated to the burner body 5 in order to prevent the boiled juice from falling into the stove body 1 from the gap between the periphery of the burner opening 2a and the burner body 5. Has been.

  A gas nozzle (not shown) facing the upstream end of the mixing tube 4 is provided in the stove body 1. Then, a mixed gas (mixed gas) of the fuel gas from the gas nozzle and the primary air sucked from the upstream end of the mixing tube 4 is generated in the mixing tube 4. The burner body 5 is formed in an inner and outer double cylinder having an inner cylinder part 51 and an outer cylinder part 52. The air-fuel mixture generated in the mixing tube 4 is supplied to the annular inner space of the burner head 6 through the space between the inner cylinder portion 51 and the outer cylinder portion 52 of the burner body 5.

  The burner head 6 is composed of a head main body 61 made of a cast or forged product of a metal such as brass, and an outer peripheral sheet metal cylindrical body 62 surrounding the head main body 61. The head main body 61 includes an annular base plate portion 61a seated on the burner body 5, a lower cylinder portion 61b extending downward from the inner periphery of the base plate portion 61a and fitting into the inner cylinder portion 51 of the burner body 5. And an upper tube portion 61c extending upward from the inner periphery of the base plate portion 61a. The cylindrical body 62 has an upper flange portion 62a extending inward in the radial direction so as to cover the head main body 61 from the upper end thereof. The cylindrical body 62 is fixed to the head body 61 by caulking the inner peripheral edge portion of the upper flange portion 62a to the upper end portion of the upper cylindrical portion 61c. Moreover, the cylindrical body 62 has a lower flange portion 62b that projects outward from the lower end in the radial direction and covers the cover ring 9 from above. The outer diameter of the lower flange portion 62 b is larger than that of the cover ring 9. Therefore, the boiled spilled juice falls on the top plate 2 along the lower flange portion 62b, and the boiled spilled juice is not applied to the cover ring 9.

  In the annular internal space of the burner head 6 defined between the base plate portion 61a of the head body 61 and the upper flange portion 62a of the cylindrical body 62, a plurality of base plate portions 61a are formed as shown in FIG. The air-fuel mixture flows in through the through holes 63. Here, the burner 3 of this embodiment corresponds to the five virtues having six virtue claws. The cylindrical body 62 has a slit-like main flame hole 64 that is long in the up-down direction and a main flame located on the lower side of the cylindrical body 62 except for six circumferential directions located in the same orientation as the six virtues of the five virtues. A plurality of auxiliary flame holes 65 smaller than the flame holes 64 are formed at intervals in the circumferential direction.

  The base plate portion 61a is provided with an ignition portion 66 that is positioned in the same direction as a predetermined one virtuosity claw and has an ignition flame hole 66a facing the ignition plug 7 and a target 66b facing the ignition plug 7. Yes. Then, a window hole 67 is opened in a portion of the cylindrical body 62 located outside the igniter 66, and an ignition flame is ejected from the window hole 67 and fires to the main flame hole 64 and the auxiliary flame hole 65 adjacent thereto. Transition ignition is performed.

  Further, at five locations in the circumferential direction of the cylindrical body 62 located in the same direction as the five virtues other than the virtues claw corresponding to the ignition portion 66, slit shapes that are smaller than the main flame hole 64 and slightly larger than the auxiliary flame hole 65 are provided. A plurality of five virtue flame holes 68 are formed at intervals in the circumferential direction. The flame formed in the five virtue flame holes 68 is smaller than the flame formed in the main flame hole 64, and it is prevented that the flame touches the five virtue claws and causes poor combustion. The five virtue flame holes 68 are formed in the lower part of the cylindrical body 62 so that the upper ends thereof are located below the upper ends of the main flame holes 64. Thereby, it can prevent more reliably that the flame of the virtues flame hole 68 touches the virtues nail.

  Further, a resistor 69 that restricts the flow of the air-fuel mixture toward the five virtue flame holes 68 is provided in the burner head 6. Specifically, the resistor 69 is formed on the outer peripheral portion of the upper surface of the base plate portion 61a at five locations in the circumferential direction in the same direction as the five virtues. Each resistor 69 includes a pair of partition plate portions 69a and 69a erected on the base plate portion 61a so as to be inscribed in the cylindrical body 62 on both sides in the circumferential direction of the location where the five virtue flame holes 68 are formed, and both partition plate portions 69a. , 69a, and a diaphragm portion 69b erected on the base plate portion 61a. The upper end of the throttle portion 69b is opposed to the upper flange portion 62a of the cylindrical body 62 with a slight gap. The air-fuel mixture does not flow into the five virtue flame holes 68 unless it passes through the gap between the throttle portion 69b and the upper flange portion 62a, and the flow of the air-fuel mixture toward the five virtue flame holes 68 is limited by the throttling effect in this gap.

  Next, the operation of this embodiment will be described. Most of the air-fuel mixture supplied to the internal space of the burner head 6 is ejected from the main flame hole 64 and burned. Here, since the main flame hole 64 is formed in the cylindrical body 62 made of sheet metal, the flame hole length in the burner radial direction becomes extremely short. Therefore, even if the width of the main flame hole 64 is considerably narrow, the passage resistance does not increase so much and no primary air suction failure occurs. As a result, it is possible to prevent backfire in a low fire state without causing a combustion failure due to a shortage of primary air.

  Further, since the passage resistance of the main flame hole 64 formed in the cylindrical body 62 made of sheet metal is small, the jet speed of the air-fuel mixture becomes too fast in a strong fire state, and the flame lift is likely to occur. However, in this embodiment, since the auxiliary flame hole 65 is formed below the main flame hole 64, lift is suppressed by mutual interference between the flame of the main flame hole 64 and the flame of the auxiliary flame hole 65. Therefore, it burns stably even in a strong fire condition.

  In addition, in order to prevent the flame from becoming large and touching the five virtue claws at the location where the five virtue flame holes 68 are formed, a sub flame hole cannot be formed under the five virtue flame holes 68. Therefore, the lift cannot be suppressed by the mutual interference of the flames. Here, in the present embodiment, since the resistor 69 that restricts the flow of the air-fuel mixture toward the five virtue flame holes 68 is provided in the burner head 6, the air-fuel mixture decelerates before reaching the five virtue flame holes 68. Is done. Therefore, the lift of the flame of the five virtue flame holes 68 can be suppressed without forming the auxiliary flame holes. As a result, the heating power of the burner 3 can be adjusted over a wide range without causing backfire or lift.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above embodiment, the head main body 61 is configured to have the base plate portion 61 a and the resistor 69 is erected on the outer peripheral portion of the upper surface of the base plate portion 61 a. It may be configured to have an upper plate portion corresponding to the upper flange portion 62a, and a resistor may be suspended from the outer peripheral portion of the lower surface of the upper plate portion.

Sectional drawing of the principal part of the stove which comprises the burner of embodiment of this invention. The perspective view of the burner of embodiment. The perspective view of the decomposition | disassembly state of the burner head of the burner of embodiment.

Explanation of symbols

  2 ... Top plate, 3 ... Stove burner, 6 ... Burner head, 62 ... Cylindrical body, 64 ... Main flame hole, 65 ... Secondary flame hole, 68 ... Gotoku flame hole, 69 ... Resistor.

Claims (1)

A burner for a stove comprising a burner head having an annular inner space to which an air-fuel mixture is supplied, the burner head comprising a cylindrical body made of sheet metal on the outer periphery, and air-fuel mixture from a flame hole formed in the cylindrical body In what is ejected and burned,
The cylindrical body has a slit-shaped main flame hole that is long in the vertical direction, except for a plurality of circumferential directions in the same direction as a plurality of five virtue claws provided in the five virtue placed on the top plate of the stove, A sub-flame hole smaller than the main flame hole is formed on the lower side, and a virtuo flame hole smaller than the main flame hole is formed at the same orientation as the Gotoku nail,
A stove burner characterized in that a resistor for restricting the flow of the air-fuel mixture toward the five virtue flame holes is provided in the burner head.

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