JP2000154907A - Burner for cooking stove - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the heating efficiency of a cooking stove having a plurality of main flame holes and auxiliary flame holes without generating lift of flame. SOLUTION: Upper edge of the outlet F0 of an auxiliary flame hole F is set lower than the upper edge of the outlet E0 of a main flame hole and a protrusion T is provided at the outlet F0 of the auxiliary flame hole F. Mixture gas fed from a mixture gas chamber to the outlet F0 of the auxiliary flame hole F is separated to the opposite sides of the protrusion T and the right side flow is guided to a main flame hole Er adjacent to the right side while the left side flow is guided to a main flame hole El adjacent to the left side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner for a stove.

[0002]

2. Description of the Related Art Conventionally, there are burners for stoves in which main flame holes and auxiliary flame holes are alternately provided to prevent the main flame from being lifted by the auxiliary flame formed by the auxiliary flame holes. .

[0003]

By the way, it is desirable that the burner for the stove has a small burner diameter in order to obtain high heating efficiency regardless of the size of the pan to be stove.
As the burner diameter decreases, the space in which the flame holes can be formed decreases, so that the total opening area of the flame holes decreases. As a result, the amount of air-fuel mixture ejected per unit opening area of the flame hole is larger than that of the burner having a large burner diameter. Therefore, the injection speed of the air-fuel mixture is increased, and the lift of the flame is more likely to occur. Similarly, when the gas supply amount is increased in order to obtain a higher heating power without changing the burner diameter, the lift of the flame is more likely to occur.

In order to solve this problem, a scissor-shaped auxiliary flame plate is formed above the alternately provided main flame holes and auxiliary flame holes, and the auxiliary flame holes are formed on the surface of the auxiliary flame plate on the flame hole side. A plurality of protrusions are formed only on the extension of the outlet, and the protrusions divide the gas from the auxiliary flame holes to form a shunting flame. The shunting flame holds the main flame to prevent the occurrence of a lift. There is a burner (see Japanese Patent No. 2762633), but the obtained lift prevention effect is not always sufficient. That is, in this burner, the projection is provided on the auxiliary flame plate above the main flame hole and the auxiliary flame hole, and the diverting flame contributing to flame holding is formed only on the upper part of the main flame, but it is horizontal (horizontal direction). In the above burner, the flame is most likely to be peeled off because the flaking of the flame at the lower edge of the outlet of the flame hole triggers the peeling of the flame to propagate to the entire periphery of the outlet of the flame hole. There is almost no flame holding effect on the lower edge of the outlet of the flame hole.

[0005] It is an object of the present invention to provide a burner for a cooking stove in which a flame lift is unlikely to occur.

[0006]

In order to solve the above-mentioned problems, the present invention provides a burner head mounted on a burner body having an annular space through which a mixture is fed from a mixing pipe. A plurality of main flame holes and auxiliary flame holes for ejecting the air-fuel mixture sent into the annular space between the burner and the auxiliary flame holes. Lower than the upper edge of the outlet of the flame hole, a protrusion is provided at the outlet of the auxiliary flame hole, and the air-fuel mixture sent from the mixture chamber to the outlet of the auxiliary flame hole is diverted to both sides of the protrusion, The branch flow is guided to the main flame hole side adjacent to one side, and the branch flow is guided to the main flame hole side adjacent to the other side.

[0007] Since most of the secondary air mixed with the air-fuel mixture ejected from the flame hole is supplied from below the flame hole, the main flame is most easily peeled off at the lower edge of the outlet of the flame hole, and the main flame in this portion is removed. Lift is likely to occur due to the peeling of
The outlet upper edge of the auxiliary flame hole is lower than the outlet upper edge of the main flame hole,
Furthermore, if a protrusion is provided at the outlet of the auxiliary flame hole to divide the air-fuel mixture to the left and right and guide each divided flow to the main flame hole, the auxiliary flame formed by the auxiliary flame hole is likely to generate a lift easily. The hole is located closer to the lower part of the exit, and the lift of the main flame is less likely to occur.

In this case, if the outer peripheral end surface of the tooth between the main flame hole and the auxiliary flame hole is retracted to the upstream side in the gas flow direction, the direction of the mixture mixture jetting from the auxiliary flame hole can be more reliably determined. The auxiliary flame formed can be directed to the lower part of the outlet of the main flame hole more reliably, and the peeling of the flame at the lower edge of the outlet of the main flame hole can be more reliably performed. This prevents the lift of the main flame from occurring.

The width of the projection is set to be equal to or larger than the width of the parallel passage of the auxiliary flame hole located inside the projection and equal to or smaller than the distance between the outlets of the main flame holes located on the left and right sides of the auxiliary flame hole. If it is set, almost all of the air-fuel mixture diverted to the left and right by the projections can flow toward the lower part of the outlet of the main flame hole, and the flame holding effect is further improved.

[0010] Further, the width of the auxiliary flame hole is widened at the outlet portion, and if the width of the protrusion is increased toward the downstream side in the gas flow direction, the direction of the divided flow of the air-fuel mixture is not only the protrusion but also the teeth. The flow is smooth and the accuracy of the flow direction is further improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 denotes a burner body made of sheet metal for a burner for a stove, and a mixing pipe 1a for feeding a mixture, and a burner formed at one end of the mixing pipe 1a. And a head 1b. A burner head 2 is mounted on the burner head 1b, and an upper opening of an annular space formed in the burner head 1b is closed by the burner head 2 to form an air-fuel mixture chamber S, Flame holes E,
F is formed (see FIG. 3). Therefore, a mixture of the gas ejected from the nozzle (not shown) facing the other end of the mixing tube 1a toward the mixing tube 1a and the primary air sucked by the gas is mixed by the mixing tube 1a by the mixture gas chamber S. And is ejected from the flame holes E and F. A burner cap 3 is placed on the burner head 2.

The burner head 1b is connected to the upper plate 11 of the mixing tube 1a.
Peripheral plate 1 attached to the opening edge 11a by caulking
2 and an upwardly extending cylindrical inner peripheral tube 13 attached to the opening edge 10a of the lower plate 10 of the mixing tube 1a by caulking.
The mixture chamber S is closed by the burner head 2.

The burner head 2 includes a disk portion 21 having an opening 2c at the center and expanding upward and a cylindrical portion 22 extending downward from the inner peripheral end of the opening 2c. When the burner head 2 is placed on the burner head 1b, the cylindrical portion 22
Is fitted in an airtight manner to the inner peripheral surface of the inner peripheral cylinder 13 whose top and bottom are open, and an air passage penetrating vertically through the cylindrical part 22 and the inner peripheral cylinder 13 is formed. Part of the air flowing upward from the bottom through the air passage is guided to the outlets of the flame holes E and F by the burner cap 3.

On the outer peripheral portion of the lower surface of the disc portion 21 of the burner head 2, a large number of teeth 23 extending radially toward the outer periphery of the burner head 2 are provided over the entire periphery of the burner head 2 as shown in FIG. Is formed. As shown in FIG. 3, the tooth grooves between the teeth 23 include a main groove Ge with a deep groove depth and a shallow sub-groove Gf with the lower surface of the burner head 2 facing upward. When the burner head 2 is placed on the burner head 1b, the lower end surfaces 23a of the teeth 23 form the seating surface 12 of the burner head 1b.
a, a main flame hole E composed of a main groove Ge and an auxiliary flame hole F composed of a sub-groove Gf are formed. The upper edge height Hf of the outlet Fo of the auxiliary flame hole F with respect to the lower end surface 23a of the tooth 23 is lower than the upper edge height He of the outlet Eo of the main flame hole E. The exit area is smaller than the exit area of the main flame hole E. Further, as shown in FIG. 2, the main grooves Ge and the sub-grooves Gf are arranged alternately except for a so-called ignition flame hole TE corresponding to a position where an ignition electrode or the like (not shown) is installed.

Reference numeral 2a denotes a central flame hole provided through the disk portion 21. Reference numeral 2b denotes a target 2 from an ignition electrode (not shown) arranged below the ignition flame hole TE.
This is an eave that prevents the juice from dripping into the window hole M formed in the outer peripheral plate 12 of the burner head 1b in order to blow the spark to c. Reference numeral 2d shown in FIG. 1 denotes a positioning projection that fits into the recess 12b formed in the burner head 1b. When the projection 2d is fitted in the recess 12b, the position of the burner head 2 in the rotation direction with respect to the burner head 1b is changed. Set, ignition target 2c
Is positioned so as to correspond to the ignition electrode below the window hole M.

By the way, the inside of the outer peripheral end of the teeth 23 on both sides of the sub-groove Gf is cut obliquely, and the outlet of the sub-groove Gf is
The width becomes wider toward the downstream side in the gas flow direction. A projection T is formed at the widening outlet. When the burner head 2 is placed on the burner head 1b, the protrusion T is disposed at the outlet Fo of each auxiliary flame hole F so as to protrude downward from its upper edge. The projection T has a triangular shape when the burner head 2 is viewed from the lower surface side (see FIGS. 2 and 4). More specifically, the protrusion T has the widest outer end surface Ta connected to the outer peripheral surface 2 e of the burner head 2, and has a tapered shape toward the gas mixture chamber S side (upstream in the gas flow direction) of the burner head 2. Has become. Therefore,
As shown in FIG. 4, the air-fuel mixture jetted from the auxiliary flame hole F is caused to flow by the protrusion T to the right side Dr, which is one side in the flow direction.
(The right side in the direction in which the air-fuel mixture flows when the burner head 2 is viewed from below) and the left side Dl, which is the other side.

In this way, the direction of the divided flow of the air-fuel mixture is determined not only by the projections T but also by the side surfaces of the teeth 23, so that the flow becomes smooth and the accuracy of the flow direction is further improved. That is, the divided air-fuel mixture can be reliably ejected toward the lower portion of the outlet Eo of the main flame hole E,
A more reliable flame holding effect can be obtained.

On the other hand, the main groove Ge and the sub groove Gf of the burner head 2
The outer peripheral end surface 23b of the tooth 23 located between the main groove Ge and the main groove G between the main groove Ge
e) The mixture chamber S than the surface sandwiched by the upper side edge of the outlet Eo)
The air-fuel mixture diverted by the projections T passes between the projections T and the teeth 23 toward the lower portion of the outlet Eo of the left and right main flame holes E. Flowing.

The width W of the projection T is not less than the width Fw of the parallel passage of the auxiliary flame hole F and not more than the distance Hw between the outlets Eo of the main flame holes E present on the left and right of the auxiliary flame hole F. The parallel passage of the auxiliary flame hole F is completely covered by the projection T from the outer peripheral side (downstream in the gas flow direction).
Therefore, almost all of the air-fuel mixture diverted left and right by the projections T can flow toward the lower portion of the outlet Eo of the main flame hole E, and the flame holding effect is further improved.

Note that the vertical dimension of the projection T is
f is shorter than the depth dimension, and the protrusion T and the seating surface 12a
Is formed between them. This gap functions as a flame hole for forming a flame for a fire.

The state of the burner having such a structure at the time of combustion will be described. The air-fuel mixture in the air-fuel mixture chamber S is supplied to the main flame hole E and the auxiliary flame hole F, and the air-fuel mixture jetted from the outlet Eo of the main flame hole E is burned to form a main flame extending obliquely upward. On the other hand, the air-fuel mixture supplied to the auxiliary flame hole F hits the projection T at the outlet Fo and is divided into left and right sides. Then, as shown in FIG. 4, the right branch stream is ejected toward the lower part of the outlet Eo of the main flame hole Er (main groove Ger) adjacent to the right side in the ejection direction Dr, and the main flame hole Er (main groove). Ger)
An auxiliary flame directed toward the lower part of the exit Eo is formed. Also,
The left branch is jetted toward the lower part of the outlet Eo of the main flame hole El (Gel) adjacent to the left side in the direction of jetting Dl, and the auxiliary flame directed to the lower part of the outlet Eo of the main flame hole El (Gel) is discharged. It is formed.

In the burner in which the main flame hole E is opened sideways (horizontally) as in the present embodiment, the main flame is peeled off at the lower edge of the exit Eo of the main flame hole E, and a lift is easily generated. In this case, since the auxiliary flame is directed to the lower portion of the outlet Eo of the main flame hole E, the main flame is effectively prevented from peeling off at the lower edge of the outlet Eo of the main flame hole E. Also, the outer peripheral end surface 23 of the tooth 23
b is retracted toward the air-fuel mixture chamber S (upstream in the gas flow direction), so that the auxiliary flame can be directed directly and reliably to the lower part of the outlet Eo of the main flame hole E. Therefore, the exit E of the main flame hole E
The flame holding at the lower part of o becomes more reliable, and the peeling of the flame at the lower edge of the exit Eo of the main flame hole E is more reliably prevented,
The main flame lift is less likely to occur. If the lift of the main flame is less likely to occur, the load on the burner hole can be increased, the burner heating efficiency can be improved by reducing the diameter of the burner, and the so-called TDR (turndown ratio) of the burner can be increased.

The main flame holes and the auxiliary flame holes are preferably arranged alternately as in this embodiment from the standpoint of the flame holding effect and have a high effect of preventing the occurrence of a lift. Even if the auxiliary groove Gf is formed every third main groove Ge so that the auxiliary flame hole exists, the effect of preventing the occurrence of lift can be obtained. In this case, only the outer peripheral end surfaces of the teeth between the sub-groove and the main groove are retracted toward the air-fuel mixture chamber, and the outer peripheral end surfaces of the teeth between the main grooves are not retracted.

In the burner according to the present embodiment, as shown in FIG. 2, for example, the opposing sub-groove Gfk and the center O of the burner head 2 are arranged so as to face the sword K1 at the upper left of FIG. The radiation point Q is defined at a point on a straight line connecting between the center O and the outlet Fo of the opposed sub-groove Gfk with respect to the center O, and the direction of the passage of the main groove Gek adjacent to the left and right of the opposed sub-groove Gfk is It is determined that the directions of the radiation rays Q1 and Q2 from the point Q coincide with each other. By doing so, the direction of the passage of the two main grooves Gek formed on both sides of the opposed sub-groove Gfk becomes wider than the direction of the radiation from the center O, and the direction of the outer groove is away from the claw K1. . Therefore, the main flame can be kept away from the nail K1, the contact of the main flame with the nail K1 can be prevented, and the burnability of the burner improves. This is the same for all Gotoku claws.

Further, according to this configuration, even if the interval between the outlets of the main grooves Gek on both sides of the opposing sub-groove Gfk is narrowed, the main grooves Gek are widened, so that the main flame can be prevented from coming into contact with the sword. If the exit interval between the main grooves Gek on both sides of the opposing sub-groove Gfk is reduced, the length of the other portions, specifically, the sections A1 and A2 can be relatively increased, and the sections A1 and A2 are formed. It is possible to increase the interval between the main flame holes to be formed and increase the number of the main flame holes, and in any case, it is possible to improve the burnability of the burner. In particular, by increasing the number of flame holes, the flame hole load can be reduced, and the effect of preventing the occurrence of lift is higher.

[0026]

As described above, according to the present invention, the heating efficiency of the burner can be improved without generating a flame lift.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a burner according to an embodiment.

FIG. 2 is a bottom view showing the entire back surface of the burner head.

FIG. 3 is a perspective view showing a main part of the burner head.

FIG. 4 is a bottom view showing a main part of the burner head.

[Explanation of symbols]

 Reference Signs List 1 burner body 1a mixing pipe 1b burner head 12a seating surface 2 burner head 23 teeth 23a lower end face 23b outer peripheral end face E main flame hole F auxiliary flame hole Eo, Fo outlet Ge main groove Gf sub groove S mixed gas chamber T protrusion Ta outside End face

Claims (4)

[Claims] A burner head is mounted on a burner body having an annular space through which a mixture is sent from a mixing pipe, and the mixture is blown into an annular space between the burner body and the burner head. In a burner for a stove where a plurality of main flame holes and auxiliary flame holes are formed, the upper edge of the auxiliary flame hole in the burner installed state is lower than the upper edge of the outlet of the main flame hole. A protrusion is provided at the outlet, and the air-fuel mixture sent from the air-fuel mixture chamber to the outlet of the auxiliary flame hole is diverted to both sides of the protrusion, and one side of the flow is guided to the main flame hole side adjacent to one side, A burner for a cooking stove characterized by guiding a branch flow on the other side to a main flame hole side adjacent to the other side. 2. The stove burner according to claim 1, wherein an outer peripheral end face of a tooth between the main flame hole and the auxiliary flame hole is retreated to an upstream side in a gas flow direction. 3. The width of the protrusion is not less than the width of the parallel passage of the auxiliary flame hole present inside the protrusion and not more than the distance between the outlets of the main flame holes present on the left and right of the auxiliary flame hole. The burner for a stove according to claim 1 or 2, characterized in that: 4. The auxiliary flame hole according to claim 1, wherein a width of the auxiliary flame hole is widened at an outlet portion, and the width of the protrusion is increased toward a downstream side in a gas flow direction. Burner for stove described.