JP4675918B2 - Stove burner - Google Patents

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 large number of slit-like flame holes that are vertically long are formed on the peripheral wall of the outer periphery of the burner head at intervals in the circumferential direction, and the air-fuel mixture supplied to the internal space of the burner head is ejected from these flame holes. To burn.

  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 radial direction of the burner head is long. The passage resistance of the flame 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.

  Conventionally, as a burner for a stove that eliminates such a problem, a cylindrical body made of sheet metal is provided on the outer periphery of the burner head, and a longitudinal slit-like flame hole is provided on the cylindrical body in the vertical direction with a circumferential interval. Many are formed (for example, refer to Patent Document 1). According to this, the flame hole length in the radial direction of the burner head 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.

By the way, in order to improve thermal efficiency, it is desired that the flame rises toward the object to be heated in the vicinity of the outer periphery of the burner head. For that purpose, it is necessary to make the jet direction of the air-fuel mixture from the flame hole obliquely upward. Therefore, in the thing of patent document 1, it forms in the taper shape which expands a cylindrical body toward a downward direction, and the normal line direction of a cylindrical body inclines diagonally upwards toward radial direction outward. Yes. However, in this case, since the flame hole length in the radial direction of the burner head is extremely short, the flow of the mixture cannot be directed in the flame hole, and the mixture can be ejected from the flame hole in the intended direction. Disappear. Therefore, even if the cylindrical body is formed in a tapered shape as described above, the ratio of the air-fuel mixture ejected obliquely upward from the flame hole does not increase so much, and it becomes difficult to improve the thermal efficiency.
JP 2000-205520 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 heat state and that can jet an air-fuel mixture from a flame hole in a target direction. .

  In order to solve the above problems, the present invention is a stove burner including a burner head having an annular inner space to which an air-fuel mixture is supplied, and the burner head includes a cylindrical body made of sheet metal on the outer periphery. A burner head is a head body composed of a cylindrical body and a metal casting or forging product, in which a large number of slit-like flame holes that are vertically long are formed in the cylindrical body at intervals in the circumferential direction. The head main body has a peripheral wall portion that is thicker than the cylindrical body along the inner peripheral surface of the cylindrical body, and the air-fuel mixture supplied to the internal space of the burner head is cylindrical on the peripheral wall portion. A plurality of air-fuel mixture passages leading to the cylindrical body are formed radially, and a plurality of slit-shaped flame holes are formed in the cylindrical body so as to be positioned within the circumferential width of each of the air-fuel mixture passages. .

  According to the present invention, the air-fuel mixture flows into the slit-shaped flame hole of the cylindrical body via the air-fuel mixture passage formed in the peripheral wall portion existing inside the cylindrical body. Here, the air-fuel mixture passage has a sufficient length to direct the flow of the air-fuel mixture because the peripheral wall portion is thick. Therefore, the air-fuel mixture can be ejected from the flame hole in the intended direction according to the air-fuel mixture passage. Therefore, if the air-fuel mixture passage is inclined obliquely upward toward the cylindrical body, the air-fuel mixture is ejected obliquely upward from the flame hole, and the thermal efficiency can be improved.

  Further, by reducing the width of the slit-shaped flame hole, it is possible to prevent backfire in a low fire state. Further, only the slit-shaped flame hole needs to be narrowed, and the width of the air-fuel mixture passage is secured wide. For this reason, the passage resistance of the air-fuel mixture does not increase, and primary air suction failure does not occur. Accordingly, it is possible to expand the heating power adjustment range without causing poor combustion due to backfire or lack of primary air.

  Further, in the present invention, it is desirable that a sub-flame hole smaller than the flame hole is formed in the cylindrical body so as to be positioned below each slit-like flame hole. Here, since the slit-shaped flame hole formed in the cylindrical body made of sheet metal has a low passage resistance, the jet speed of the air-fuel mixture becomes too fast in a strong fire state, and lift tends to occur. On the other hand, if the auxiliary flame hole is formed, the lift can be suppressed by mutual interference between the flame of the slit-like flame hole and the flame of the auxiliary flame hole.

  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 (not shown) are placed so as to surround the burner opening 2 a. 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 a pan bottom temperature sensor 7 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 8 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 upper plate portion 61a, a cylindrical portion 61b that hangs on the inner peripheral portion of the lower surface of the upper plate portion 61a, and fits to the inner cylindrical portion 51 of the burner body 5, and an upper plate portion. A peripheral wall portion 61 c is provided on the outer peripheral portion of the lower surface of 61 a so as to extend along the inner periphery of the cylindrical body 62. The peripheral wall portion 61 c is thicker than the cylindrical body 62, and its lower end surface is seated on the upper end surface of the outer cylinder portion 52 of the burner body 5. Further, as shown in FIG. 3, a plurality of air-fuel mixture passages 63 that guide the air-fuel mixture supplied to the internal space of the burner head 6 to the cylindrical body 62 are formed in the peripheral wall portion 61 c. Each air-fuel mixture passage 63 is configured by a groove formed in the peripheral wall portion 61 c so as to be recessed upward from the lower end surface thereof, and the lower end of the groove is closed by the upper end surface of the outer cylinder portion 52 of the burner body 5. The upper surface of the groove and the upper end surface of the outer cylinder portion 52 are provided with an upward gradient in the radial direction so that the air-fuel mixture passage 63 is inclined obliquely upward toward the cylindrical body 62.

  The cylindrical body 62 has an upper flange portion 62a extending inward in the radial direction so as to cover the upper plate portion 61a of 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 inner peripheral edge portion of the upper plate portion 61a. Further, 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 8 from above. The outer diameter of the lower flange portion 62b is larger than that of the cover ring 8. Therefore, the boiled spilled juice falls on the top plate 2 along the lower flange portion 62b, and the spilled juice is not applied to the cover ring 8.

  A portion of the cylindrical body 62 that surrounds the peripheral wall portion 61c of the head body 61 is positioned within the circumferential width of each mixture passage 63, and a slit-like main flame hole 64 that is long in the vertical direction is circumferentially spaced. In addition, two sub-flame holes 65 smaller than the main flame holes 64 are formed at the lower side of each main flame hole 64.

  The virtues are provided with a plurality of virgin claws extending to the vicinity of the upper portion of the burner head 6, and if a flame touches these virtues, a combustion failure occurs. For this reason, the main flame holes 64 are not formed at a plurality of locations in the circumferential direction of the cylindrical body 62 located in the same direction as these five virtue claws, but the five virtue flame holes 66 slightly larger than the auxiliary flame holes 65 are formed. Further, the depth of the groove formed in the peripheral wall portion 61c of the head main body 61 corresponding to the five virtue flame holes 66 is made shallow, and this groove constitutes an air-fuel mixture passage 63 'having a large passage resistance for the five virtue flame holes 66. ing.

  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 is extremely short, and the direction of the air-fuel mixture flow when passing through the main flame hole 64 It cannot be sex. On the other hand, in the present embodiment, the air-fuel mixture flows into the main flame hole 64 via the air-fuel mixture passage 63 formed in the peripheral wall portion 61 c of the head body 61. Since the peripheral wall 61c is thick, the air-fuel mixture passage 63 has a sufficient length to give direction to the air-fuel mixture flow. Since the air-fuel mixture passage 63 is inclined obliquely upward toward the cylindrical body 62, the air-fuel mixture can be ejected obliquely upward from the main flame hole 64. As a result, the flame of the main flame hole 64 rises toward the object to be heated in the vicinity of the outer periphery of the burner head 6, and the thermal efficiency is improved.

  Further, by reducing the width of the main flame hole 64, it is possible to prevent backfire in a low heat state. Here, even if the width of the main flame hole 64 is narrowed, the width of the air-fuel mixture passage 63 is wide, so that the passage resistance of the air-fuel mixture does not increase and primary air suction failure does not occur. Accordingly, it is possible to expand the heating power adjustment range without causing poor combustion due to backfire or lack of primary air.

  In addition, 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 lift tends 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 the formation location of the virtuosity flame hole 66, in order to prevent a flame from enlarging and touching the virtuosity nail, an auxiliary flame hole should not be formed. Therefore, the lift cannot be suppressed by the mutual interference of the flames. However, since the air-fuel mixture passage 63 ′ for the five virtue flame holes 66 has a high passage resistance, the air-fuel mixture is decelerated before reaching the five virtue flame holes 66 and the lift is suppressed.

  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 cylindrical body 62 is configured to have the upper flange portion 62a, but the upper flange portion 62a is omitted and the cylindrical body 62 is provided on the outer peripheral surface of the peripheral wall portion 61c of the head body 61. May be externally fixed by welding or the like. In the above embodiment, the number of main flame holes 64 formed in the circumferential width of each mixture passage 63 is two, but the number may be three or more.

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 seen from the slanting lower part of the burner head of the burner of embodiment.

Explanation of symbols

  3 ... Stove burner, 6 ... Burner head, 61 ... Head body, 61c ... Peripheral wall part, 62 ... Cylindrical body, 63 ... Mixture passage, 64 ... Main flame hole (slit flame hole), 65 ... Secondary flame Hole.

Claims (3)

A stove burner having 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 having a slit-like shape elongated in the vertical direction in the cylindrical body In the case where many flame holes are formed at intervals in the circumferential direction,
The burner head is composed of a cylindrical body and a head body made of a metal casting or forging,
The head body has a peripheral wall portion that is thicker than the cylindrical body along the inner peripheral surface of the cylindrical body, and in this peripheral wall portion, the air-fuel mixture supplied to the internal space of the burner head is mixed to the cylindrical body. A plurality of air passages are formed radially,
A stove burner characterized in that a plurality of slit-shaped flame holes are formed in a cylindrical body within the circumferential width of each of the air-fuel mixture passages.   The stove burner according to claim 1, wherein each of the air-fuel mixture passages is inclined obliquely upward toward the cylindrical body.   The burner for a stove according to claim 1 or 2, wherein a sub-flame hole smaller than each flame hole is formed in the cylindrical body, located below the slit-like flame hole.

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