JP2015140927A - Burner for cooking stove - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a burner for cooking stove that has good firing performance by generating a firing spark at a proper place by a firing device and securely firing a fuel gas discharged from a flame hole for firing.SOLUTION: There is provided a burner for cooking stove such that a plurality of main flame holes 41 are provided at a peripheral edge of a burner cap 2, a flame hole 40 for firing and a firing device 27 which generates a firing spark nearby it are provided between some adjacent main flame holes 41, and an outer peripheral wall 30 on a radially outer side of a wall part surrounding a periphery of a space 3 for retention which reduces the discharge flow rate of a fuel gas from the flame hole 40 for firing is formed into a concave curved surface 26 which is concave radially inward. An outer surface Ws of a border wall with the main flame hole 40 of the wall part surrounding the periphery of the space 3 for retention and an intermediate surface "m" of an outer surface Wo of the outer peripheral wall on the radially outer side of the wall part surrounding the periphery of the space 3 for retention are formed into a curved surface R.

Description

In the present invention, a burner cap is placed on a burner body having a mixing chamber, and a plurality of main flame holes are provided on the periphery of the burner body and the burner cap, and some of the plurality of main flame holes are adjacent to each other. Between the main flame holes, an ignition flame hole comprising a vertically long opening with the vertical direction as the longitudinal direction is provided, and an ignition device for generating an ignition spark in the vicinity of the ignition flame hole is provided,
A residence space is provided between the ignition flame hole and the mixing chamber to decelerate a discharge flow rate of the fuel gas from the ignition flame hole, and the mixing chamber and the residence space are provided. The present invention relates to a technique for improving the ignition performance of a burner for a stove that is communicated by a communication hole and has a concave curved surface in which a radially outer peripheral wall of a wall portion surrounding the staying space is recessed inwardly.

Conventionally, a stove burner as shown in Patent Document 1 is known. This stove burner has a burner cap placed on a burner body having a mixing chamber, and a large number of main flame holes are provided on the periphery thereof, and the vertical direction is defined as the longitudinal direction between some adjacent main flame holes. An ignition flame hole having a vertically long opening is provided, and an ignition device for generating an ignition spark is provided in the vicinity of the ignition flame hole. Further, a retention space is provided between the ignition flame hole and the mixing chamber to reduce the flow rate of the fuel gas discharged from the ignition flame hole, and the mixing chamber and the retention space are communicated with each other. The outer peripheral wall on the outer diameter side of the wall portion surrounding the staying space is formed into a concave curved surface that is recessed inward on the inner diameter side. With this configuration, no ignition spark is generated between the outer peripheral wall on the outer diameter side of the wall portion surrounding the staying space and the spark plug, and the spark plug and the spark spark target are properly disposed. Ignition sparks are generated in the engine.

JP 2006-029723 A

  However, since the boundary between the concave curved surface and the main flame hole is not smooth, the electric field strength in the vicinity of the boundary between the concave curved surface and the main flame hole is high when a high voltage is applied to the spark plug. It tends to be large, and sparks are likely to occur between the concave curved surface and the boundary between the main flame holes and the spark plug.

  The present invention has been made in view of the above. An ignition spark is generated at an appropriate location in the ignition device, and the fuel gas discharged from the ignition flame is reliably ignited so that the ignition performance is improved. It is an object to provide a good stove burner.

In order to achieve this object, a burner for a stove according to the present invention has a burner cap placed on a burner body having a mixing chamber, and a plurality of main flame holes are provided on the periphery of the burner body and the burner cap. An ignition flame consisting of a vertically long opening with the vertical direction as a longitudinal direction is provided between some of the main flame holes adjacent to each other, and an ignition spark is provided in the vicinity of the ignition flame hole. An ignition device is provided,
A residence space is provided between the ignition flame hole and the mixing chamber to decelerate a discharge flow rate of the fuel gas from the ignition flame hole, and the mixing chamber and the residence space are provided. A stove burner configured to have a concave curved surface in which a radially outer peripheral wall of a wall portion surrounding the staying space is communicated with a communication hole, and is recessed inward in the radial direction,
According to the first aspect of the present invention, the outer surface of the boundary wall with the main flame hole in the wall portion surrounding the staying space, and the outer diameter of the wall portion surrounding the staying space. A feature is that an intermediate surface of the outer surface of the outer peripheral wall is formed into a curved surface.

  According to the first aspect of the present invention, the outer surface of the boundary wall with the main flame hole and the intermediate surface of the outer surface of the outer peripheral wall on the outer diameter side of the wall portion surrounding the staying space are formed in a curved surface. Therefore, the electric field intensity in the vicinity of the boundary between the outer surface of the boundary wall with the main flame hole in the wall portion surrounding the staying space and the outer surface of the outer peripheral wall on the outer diameter side of the wall portion surrounding the staying space is An ignition spark is generated at an appropriate location in the igniter, and the fuel gas discharged from the ignition flame is reliably ignited to provide a stove burner with good ignition performance. It becomes possible.

  The cooker according to claim 2 is the cooker according to claim 1, wherein the ignition device has an ignition spark target formed on a curved surface having a radius of 0.5 mm or less, and a high voltage between the ignition spark target and the ignition spark target. It comprises an ignition plug that generates an ignition spark when applied, and the radius of the curved surface of the intermediate surface is 1 mm or more.

  According to invention of Claim 2, the said diameter of the outer surface of the boundary wall with the said main flame hole of the wall part surrounding the circumference | surroundings of the said retention space, and the wall part surrounding the said circumference | surroundings space The outer peripheral wall boundary of the outer peripheral wall is formed on a curved surface having a radius of at least twice the radius of 0.5 mm of the curved surface formed on the ignition spark target in the ignition device. The electric field strength in the vicinity of the outer surface of the outer peripheral wall of the outer diameter wall of the outer wall of the outer wall of the outer wall of the outer wall of the outer wall of the outer wall and the outer wall of the boundary wall with the main flame hole is more reliably suppressed. An ignition spark is generated at an appropriate location in the ignition device, and the fuel gas discharged from the ignition flame hole is more reliably ignited, so that a stove burner with better ignition performance can be obtained. .

According to the first aspect of the present invention, the ignition spark is generated at an appropriate location in the ignition device, and the fuel gas discharged from the ignition flame is reliably ignited, so that the ignition performance is achieved. However, it is possible to obtain a good stove burner.
Further, according to the second aspect of the present invention, in addition to the effect of the first aspect, the stove burner can be further improved in ignition performance.

1 shows an embodiment of a stove burner of the present invention, (a) is an overall perspective view, and (b) is a perspective view excluding a burner cap (and a cover body). The stove burner of embodiment same as the above is shown, (a) is a plan view, and (b) is a side view. It is the perspective view which looked at the burner cap inverted upside down in embodiment same as the above from the upper direction (namely, downward in use condition). It is a bottom view of the principal part of the burner cap in embodiment same as the above. It is a bottom view of the principal part of the burner cap of the conventional stove burner.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  The stove burner is constituted by a burner cap 2 that is detachably mounted on the mixing chamber 10 of the burner body 1 to constitute a main body. In the present embodiment, as shown in FIGS. 1 and 2, an annular opening (in the illustrated example, an annular shape) is formed inside the burner base 13 having an annular shape (in the illustrated example) formed in the burner body 1. ) Is formed. Note that the burner base 13 and the mixing chamber 10 may have an elliptical shape or other shapes instead of the annular shape as shown in FIGS.

  As shown in FIGS. 1 and 2, the burner main body 1 is configured such that a mixing tube 11 is integrally provided on a main burner base 13. The internal space of the mixing tube 11 communicates with the mixing chamber 10 on the downstream side. An opening end 11a is formed at the upstream end of the internal space of the mixing pipe 11, and a gas nozzle (not shown) for discharging a gas (raw gas) serving as fuel toward the internal space is disposed at the open end 11a. Yes. When gas is discharged from the gas nozzle, primary air is sucked from the opening end 11a at the upstream end of the mixing pipe 11, and the gas and primary air are mixed in the mixing pipe 11 to generate fuel gas. Yes. The secondary air for combustion is also supplied through the secondary air flow hole 12 formed on the inner peripheral side of the annular burner body 1.

  The burner cap 2 is placed on the burner body 1 and forms a plurality of main flame holes 41 at the peripheral edges of the burner body 1 and the burner cap 2. In the present embodiment, as shown in FIG. 3, the burner cap 2 includes a cap body 20 having an annular shape (annular shape in the illustrated example) and a cap cylinder continuously provided downward from the inner edge of the cap body 20. Part 21. A plurality of main flame hole grooves 22 extending radially outward from the central portion C (see FIG. 2) in plan view are formed on the lower surface of the cap body 20 so as to be recessed upward.

  As shown in FIGS. 1A and 2A, the burner cap 2 has the burner cap 2 disposed on the burner base 13, and the cap cylinder portion 21 disposed on the inner side of the burner base 13. 10 is inserted into a cylindrical inner cylinder portion 14 serving as a wall portion on the inner side of 10 to form a stove burner, and the upper opening of the mixing chamber 10 is blocked by the burner cap 2. As a result, the air around the outer periphery of the burner base 13 and the burner cap 2 communicates with the inner mixing chamber 10 via the main flame hole groove 22, and the fuel gas in the mixing chamber 10 passes through the main flame hole groove 22. Can flow outward through. That is, the portion between the outer opening of the main flame hole groove 22 and the upper surface 13a of the burner base 13 becomes the main flame hole 41 where the fuel gas to be ejected is mixed with the secondary air and burned.

  Moreover, in this embodiment, as shown in FIG. 3, the recessed part 23 which dents upwards so that it may open below is formed in part or all between the groove | channels 22 for main flame holes of the burner cap 2, The interior of the recess 23 is a storage space where fuel gas is stored and decompressed. One or more of the fuel gas from the mixing chamber 10 flows into the recess 23 into the inner side (center C side of the cap body 20) of the wall surrounding the recess 23. The inflow part 23a which consists of a groove | channel and opening is provided.

  As shown in FIGS. 1 (a) and 2 (b), with the burner cap 2 mounted on the burner base 13, the lower end of the wall portion of the recess 23 of the burner cap 2 and the upper surface 13a of the burner base 13 A gap is formed between the two, and this gap becomes the flame holding hole 42. The flame holding hole 42 is supplied with the fuel gas from the mixing chamber 10 with the flow rate reduced and the flow rate reduced by the inflow portion 23a and the concave portion 23.

  Further, in the present embodiment, as shown in FIGS. 1A and 3, the burner cap 2 has a radially outward direction on a surface above a portion between some adjacent two main flame hole grooves 22. Grooves 24 for supplying secondary air that extend radially and are recessed downward to open upward are formed. The secondary air for combustion that has flowed from the lower side through the secondary air flow hole 12 through the concave groove 24 is supplied to the main flame hole 41. Thus, even when the amount of secondary air for combustion supplied from the outer periphery of the burner body 1 is small, the secondary air is also supplied from the inner peripheral side via the secondary air flow hole 12 and the concave groove 24. As a result, the secondary air is sufficiently supplied to enable stable combustion.

  In the present embodiment, as shown in FIGS. 1A and 2B, a cover for preventing boiled juice or the like from dropping and adhering to the burner cap 2 on the upper surface of the burner cap 2. A body 5 is provided. The cover body 5 is attached to the burner cap 2 by driving a fixing tool 25 a such as a hook or rivet into a mounting boss 25 provided on the burner cap 2.

  An ignition flame hole 40 is formed between some adjacent main flame holes 41. The ignition flame hole 40 is composed of a vertically long opening whose longitudinal direction is the vertical direction. Between the ignition flame hole 40 and the mixing chamber 10, a stay space 3 is provided in which the fuel gas is retained to decelerate the discharge flow rate of the fuel gas from the ignition flame hole 40.

  In the present embodiment, as shown in FIG. 3, a recessed portion that is recessed upward is formed in the mounting portion of the burner cap 2 on the burner main body 1 so as to open downward, and the interior of the recessed portion is a retention space 3. It becomes.

  The mixing chamber 10 and the retention space 3 are communicated with each other through the communication hole 31. In the present embodiment, as shown in FIG. 3, the fuel gas from the mixing chamber 10 is disposed on the inner side (the center C side of the cap body 20) of the wall portion 30 surrounding the staying space 3. Is provided with a communication hole 31 composed of one or a plurality of grooves and openings (two grooves in the present embodiment) for flowing into the retention space 3. The ignition flame hole 40 is formed as one or a plurality of (one in this embodiment) grooves in the outer portion of the wall portion 30 surrounding the stay space 3. In the present embodiment, the outer surface Wo of the wall portion 30 where the ignition flame hole 40 of the burner cap 2 is provided is a concave curved surface 26, and the ignition flame hole 40 is formed at the center in the circumferential direction of the concave curved surface 26. Has been. The communication hole 31 and the ignition flame hole 40 are in a positional relationship that is not located on a straight line extending in the radially outward direction from the central portion C in the plan view of the cap body 20 of the burner cap 2.

  An ignition device 27 for generating an ignition spark is provided in the vicinity of the ignition flame hole 40. In the present embodiment, in the plan view, the burner base 13 is provided in the radially outward direction of the portion where the ignition flame hole 40 is provided. The ignition device 27 is mainly composed of an ignition plug 27a and an ignition spark target 27b. The spark plug 27a is attached to the burner base 13, and the electrode of the spark plug 27a protrudes upward. Above the portion of the burner cap 2 where the ignition flame hole 40 is provided, a flange portion 28 is provided so as to protrude outwardly from the boiling of the ignition flame 40 so as to prevent the soup from falling and adhering. Yes. An ignition spark target 27b is provided on the lower surface of the flange portion 28, and the electrode of the ignition plug 27a and the ignition spark target 27b face each other with a predetermined gap therebetween.

  When the ignition device 27 generates a spark by applying a high voltage (15 kV in this embodiment) between the electrode of the spark plug 27a and the spark spark target 27b, the fuel discharged from the ignition flame hole 40 The gas is ignited to form an ignition flame. At this time, the fuel gas supplied from the mixing chamber 10 flows into the staying space 3 from the communication hole 31 and temporarily stays in the staying space 3, and is discharged from the ignition flame hole 40 in a state where the discharge flow rate is reduced. It has come to be. The fuel gas discharged from the main flame hole 41 and the flame holding hole 42 is ignited by the ignition flame formed in the ignition flame hole 40, and a main flame F having a large flame is formed in the main flame hole 41. A small flame holding flame is formed in the flame holding hole 42 over the entire circumference.

  In the present embodiment, as shown in FIGS. 3 and 4, a barrier portion 33 that suppresses the flow of the fuel gas flowing in from the communication hole 31 in the radially outward direction is provided in the retention space 3. The barrier portion 33 is configured by a hanging piece that hangs downward from an upper surface in the staying space 3. In the present embodiment, the barrier portion 33 extends radially from the center portion C in a plan view of the cap body 20 and is positioned on a straight line passing through the communication hole 31.

  In the present embodiment, the barrier portion 33 is provided with a gas passage portion 34 that allows the fuel gas flowing in from the communication hole 31 to pass toward the ignition flame hole 40. The lower end of the barrier portion 33 is located above the upper surface 13a of the burner base 13, and a gas passage portion 34 is formed between the lower end and the upper surface 13a.

  Further, in the present embodiment using the present invention, as shown in FIGS. 3 and 4, the outer surface Ws of the boundary wall with the main flame hole 41 in the wall portion 30 surrounding the staying space 3, and An intermediate surface m between the outer surfaces Wo of the outer peripheral walls on the outer diameter side of the wall portion 30 surrounding the stay space 3 is formed on the curved surface R. In the present embodiment, the radius of the curved surface R is 1.5 mm, which improves the ignition performance as described below.

  Since the ignition spark target 27b generates an ignition spark between the ignition plug 27a and the tip of the ignition spark target 27b, the burner cap 2 is made of an aluminum die cast or brass forging. In this case, the tip of the ignition spark target 27b is formed into a curved surface having a radius of about 0.3 mm to 0.5 mm for reasons such as improving the durability of the mold. In this embodiment, the tip of the ignition spark target 27b is formed in a curved surface having a radius of 0.3 mm.

  If the outer surface Ws of the boundary wall with the main flame hole 41 in the wall portion 30 surrounding the stay space 3 and the outer peripheral wall on the outer diameter side of the wall portion 30 surrounding the stay space 3 are In the case where the intermediate surface m between the outer surfaces Wo is not formed on the curved surface R, for example, among the wall portions 30 surrounding the stay space 3 like the burner cap 2 'in the conventional stove burner shown in FIG. When the edge Ed exists between the outer surface Ws of the boundary wall with the main flame hole 41 and the outer surface Wo of the outer peripheral wall on the outer diameter side of the wall portion 30 surrounding the staying space 3, the spark plug 27a When a high voltage (for example, 15 kV) is applied between the ignition spark target 27b and the ignition spark target 27b, the ignition spark target 27b and the edge Ed are at the same potential. In the air around Ed Dielectric breakdown tends to occur, and as a result, a discharge occurs between the spark plug 27a and the edge Ed, and the voltage between the spark plug 27a and the spark spark target 27b decreases, so that the spark plug 27a and the spark An ignition spark does not occur between the spark target 27b and the ignition device 27 does not properly generate an ignition spark.

  On the other hand, as shown in FIGS. 3 and 4, the outer surface Ws of the boundary wall with the main flame hole 41 in the wall portion 30 surrounding the staying space 3 and the surroundings of the staying space 3 are surrounded. In the present embodiment in which the intermediate surface m between the outer surfaces Wo of the outer peripheral walls on the outer diameter side of the wall portion 30 is formed as a curved surface R having a radius of 1.5 mm, between the spark plug 27a and the ignition spark target 27b. When a high voltage (for example, 15 kV) is applied to the ignition spark target, the electric field strength in the vicinity of the intermediate surface m formed on the curved surface R having a radius of 1.5 mm is formed on the curved surface having a radius of 0.3 mm. The electric field intensity at the tip of 27b does not become larger, and the ignition spark is properly generated between the spark plug 27a and the ignition spark target 27b, that is, at an appropriate location of the ignition device 27, and the ignition performance. It is intended to improve.

The ignition device 27 includes an ignition spark target 27b formed on a curved surface having a radius of 0.5 mm or less and an ignition plug 27a that generates an ignition spark by applying a high voltage between the ignition spark target 27b and the ignition spark target 27b. If the radius of the curved surface of the intermediate surface m is 1 mm or more, which is twice the radius of the curved surface at the tip of the ignition spark target 27b, the electric field strength in the vicinity of the intermediate surface m is larger than the electric field strength at the tip of the ignition spark target 27b. The situation is sufficiently suppressed.

  The outer surface Ws of the boundary wall with the main flame hole 41 in the wall portion 30 surrounding the staying space 3 and the outer peripheral wall on the outer diameter side of the wall portion 30 surrounding the staying space 3. Even when the intermediate surface m between the outer surfaces Wo is formed into a curved surface R having a radius of 1.5 mm, the edge Et of the ignition flame hole is formed around the ignition flame hole 40 as shown in FIG. Although it exists, even if a discharge occurs due to dielectric breakdown between the spark plug 27a and the edge Et of the ignition flame hole, the spark plug 27a exists in the radially outward direction of the ignition flame hole 40. Thus, the ignition gas flowing in the radially outward direction from the ignition flame hole 40 and the discharge between the ignition plug 27a and the edge Et of the ignition flame hole are properly in contact with each other, so that the ignition gas is appropriately ignited. Is done.

  Incidentally, in this embodiment, since the barrier part 33 which suppresses the flow to the radial direction of the fuel gas which flowed in from the communicating hole 31 in the staying space 3 is provided, the staying space 3 from the communicating hole 31 is provided. The fuel gas that has flowed into the gas flow is prevented from flowing in the radially outward direction and discharged from the opening 32, thereby improving the ignition performance.

  The fuel for the cooking device is not limited to gas, but may be other fuels including petroleum-based fuel, and the type of fuel is not particularly limited.

DESCRIPTION OF SYMBOLS 1 Burner main body 10 Mixing chamber 11 Mixing pipe 11a Open end 12 Secondary air flow hole 13 Burner base 13a Upper surface 14 Inner cylinder part 2 Burner cap 20 Cap main body 21 Cap cylinder part 22 Groove for main flame holes 23 Recessed part 23a Inflow part 24 Groove 25 Boss 25a Fixing tool 26 Concave surface 27 Ignition device 27a Spark plug 27b Ignition spark target 28 Gutter part 3 Retention space 30 Wall part 30a Lower end 31 Communication hole 32 Opening part 33 Barrier part 34 Gas passage part 40 Ignition flame hole 41 Main flame hole 42 Flame holding hole 5 Cover body C Center portion Wo Outer surface of outer peripheral wall Ws Outer surface of boundary wall with main flame hole m Intermediate surface R Curved surface Ed Edge Et Edge of flame hole for ignition

Claims (2)

A burner cap is placed on a burner body having a mixing chamber, and a plurality of main flame holes are provided at the periphery of the burner body and the burner cap, and a part of the main flame holes adjacent to each other among the plurality of main flame holes. In between, provided with an ignition flame consisting of a vertically long opening with the vertical direction as the longitudinal direction, and provided with an ignition device for generating an ignition spark in the vicinity of the ignition flame,
A residence space is provided between the ignition flame hole and the mixing chamber to decelerate a discharge flow rate of the fuel gas from the ignition flame hole, and the mixing chamber and the residence space are provided. A stove burner configured to have a concave curved surface in which a radially outer peripheral wall of a wall portion surrounding the staying space is communicated with a communication hole, and is recessed inward in the radial direction,
Between the outer surface of the boundary wall with the main flame hole in the wall portion surrounding the staying space, and the outer surface of the outer peripheral wall on the outer diameter side of the wall portion surrounding the staying space. A stove burner characterized in that the intermediate surface is formed into a curved surface.   The ignition device includes an ignition spark target formed on a curved surface having a radius of 0.5 mm or less, and an ignition plug that generates an ignition spark by applying a high voltage between the ignition spark target and the curved surface of the intermediate surface The burner for a stove according to claim 1, wherein the radius of the stove is 1 mm or more.