JPH0289904A - Gas burner with inner burner port - Google Patents

Abstract

PURPOSE:To prevent entrance of stock to an inner burner port by means of a cap and to enable provision of excellent heat distribution by a method wherein the flame of an inner burner port is collided in a semicombustion state with a cap with which the upper part of the inner burner port is covered, and is brought into a complete combustion state in a position allowing the flame to flow through the outer periphery of the cap to the outside. CONSTITUTION:A cap 10 has an outer size large enough to allow covering of not only a secondary air passage 5 but also an inner burner port 9 formed in the outer periphery thereof. A stock cut 101 slightly hung down is formed throughout the whole periphery of the outer periphery part of the cap. Stock is forced to drop through the inner burner port 9 to a slope part 31 located to the outside of the cap. A distance from the inner burner port 9 to the cap 10 is selected to a relatively low value, and the flame of the inner burner port 9 has a part 95 in a semicombustion state collided with the cap 10. The flame is guided to the outside of the cap 10 by means of a guide surface 102 gradually inclined upward toward a portion on the outer side. The flame is completely burnt at a stage in which it flows through the outer periphery of the cap 10 to the outside and rises to generate a part 96 in a complete combustion state having a high temperature.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to an improvement in a gas burner with internal flame holes.

<Prior art> In burners for gas appliances such as gas stoves, which are provided with inner flame holes to improve heat distribution, the flame in the inner flame hole has two
A secondary air passage is provided for supplying secondary air. This secondary air passage usually passes vertically through the center of the burner head, and a cap is often provided to cover the top to prevent falling boiling liquid from entering. In some cases, the inner flame hole is also covered to prevent boiling liquid from entering the inner flame hole. At this time, in order to prevent the flame from the inner flame hole from directly shining on the cap, the flame from the inner flame hole is generated radially outward.

<Problems to be Solved by the Invention> If the flame of the inner flame hole is generated radially as described above, the heat tends to be biased towards the outer periphery of the burner, and the effect of improving heat distribution, which is the purpose of the inner flame hole, is insufficient. There was a problem that it became

The present invention has focused on these problems, and has been made with the object of providing a gas burner that can prevent boiling liquid from entering the inner flame hole with a cap and can obtain good heat distribution.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the gas burner with an inner flame hole of the present invention covers the upper part of the inner flame hole with a cap, and
The shape and arrangement of the inner flame hole and the cap are selected so that the flame from the inner flame hole hits the cap in a semi-combusted state, and complete combustion occurs at a position outside the outer periphery of the cap. Further, it is advantageous to provide a guide surface that guides the flame to the outside of the cap at the part of the cap that is hit by the flame, since the flame can easily come out from the outer periphery of the cap.

<Operation> According to this invention, the flame in the inner flame hole is not generated radially but is actively applied to the cap, and complete combustion occurs when it rises outside the cap, so the heat is transferred to the burner. It becomes easy to obtain an appropriate heat distribution without being biased toward the outer peripheral portion of the heat source. The flame that hits the cap is in a semi-combusted state, so the temperature is relatively low, so there is no need to use special materials for the cap to prevent deterioration or damage due to heat, and since the top of the inner flame hole is covered with the cap, Even if the inner flame hole is provided upward, the boiling liquid will not enter, and the function of preventing boiling liquid by the cap will be fully developed. Furthermore, since the flame in the inner flame hole hits the cap once, lift is less likely to occur, and a stable combustion state can be obtained even when using a strong flame with a large flow rate.

<Example> Next, an illustrated embodiment will be described.

In the figure, 1 is an annular burner head formed by combining a burner base 2 and a burner top 3, 4 is a mixing pipe provided on the outer periphery of the burner base 2, and 5 is an annular burner head located above and below the center of the burner head 1. The secondary air passage 6 passing through is a nozzle attached to the end of the mixing tube 4.

The burner top 3 has a shape that matches the burner base 2, and has a plurality of radial slits on the lower edge of its outer periphery, so that when combined with the burner base 2, a plurality of vertically elongated main flame holes 7 are formed on the outer periphery. An annular air mixture chamber 8 is formed inside the air mixture chamber 8 and communicated with the mixing tube 4 by the combination of both members, and a plurality of inner flame holes 9 that communicate with this air mixture chamber 8 are formed in the vertical direction. It is formed and opens on the upper surface of the burner top 3. Reference numeral 10 denotes a cap provided on the upper surface of the burner top 3 so as to cover the secondary air passage 5 and the upper surface of the inner flame hole 9.

The configuration described above is basically not much different from the conventional one, but in this embodiment, the mixing tube 4. The following configuration is adopted for the nozzle 6, main flame hole 7, inner flame hole 9, and cap 10, resulting in a gas burner with excellent features.

That is, the nozzle 6 has a nozzle part 62 attached to a body 61, and as shown in FIG. They are arranged almost parallel to each other, and have an overall flat shape. In response to this,
The throat portion 41 of the mixing tube 4 also has a flat cross-sectional shape, and each gas flow 6 injected from each nozzle hole 63
Its shape and size are selected so that the air suction effect by 4 is sufficient. Therefore, the total surface area of the plurality of gas streams injected from the nozzle 6 is larger than that in the case of one nozzle hole, and the primary air suction ability is increased, and a large amount of primary air is sucked in.

This makes it possible to improve the flame hole load. Note that the distance between adjacent nozzle holes 63 is 12 to 1 of the diameter d of the nozzle holes 63.
The thickness of the bottom part 41 should be approximately 3 times larger than D, and the width should be 3 times larger.
When the value is D or more, the air suction effect of the gas flow injected from each nozzle hole 63 is not hindered, and even in the case of propane gas, which requires the most air, sufficient air can be suctioned.

Therefore, if the burner diameter is the same, the maximum thermal power can be increased, and if the maximum thermal power is the same, the burner diameter can be small, and the ratio of the maximum input amount to the minimum input amount (TDR) gas appliances can be improved or downsized. Further, since the diameter of the nozzle hole 63 may be smaller than that of the conventional example, the length L of the mixing tube 4 required for mixing primary air and gas is shortened, which is also effective in downsizing the device. In the embodiment, the length L of the mixing tube 4
Good results were obtained by setting D to 4 to 5 times the thickness D of the throat portion 41.

Next, the main flame hole 7 and the inner flame hole 9 will be explained. Figure 4 (a
) and (b), the main flame hole 7 is composed of one slit 71 on the outlet side and two slits 72 on the inlet side, and a partition plate 73 is formed between the two slits 72. has been done. The width of the slit 72 is slightly smaller than 1/2 of the slit 71, and the depth is also slightly shallower, and the total cross-sectional area of the two slits 72 is smaller than the cross-sectional area of the slit 71. Due to this configuration, when the firepower is strong,
The gas ejection speed is reduced in the part of the slit 71 with a large cross-sectional area, and lift is prevented, and when there is a small flame with a small ejection speed, heat is easily removed from the wall of the slit 72 with a small cross-sectional area, preventing backfire. The occurrence is prevented, and the partition plate 73
acts as a current plate, resulting in a stable combustion state.

In the embodiment, the width and depth of each slit are 3.
/4 m, and the slit 72 is approximately 1.2 x 2.9 mm, and good results have been obtained with this value. The flame holes 7 facing the legs of the trivet have shallow slits to prevent large flames from forming.

Further, the inner flame hole 9 includes a plurality of circular holes 9 (three in the embodiment) arranged close to each other along the outer periphery of the secondary air passage 5.
1, and a long hole-shaped recess 92 provided in common to these circular holes 91 on the upper surface of the burner top 3 (a fifth
(see figure). Due to this configuration, when the firepower is strong,
Each circular hole 91 acts like an independent flame hole and burns.

The elongated recess 92 having a large cross-sectional area reduces the gas ejection speed and prevents lift. In addition, in the case of a small flame with a low ejection speed, heat is removed by the wall surface of the circular hole 91 with a small cross-sectional area, so backfire is prevented. Since the fuel burns in pieces, the heat necessary for continued combustion is less likely to be lost, and the flame-holding effect crystallizes, resulting in a stable combustion state.

Next, the relationship between the inner flame hole 9 and the cap 10 will be explained (
(See Fig. 6), the outer diameter of the cap 10 is large enough to cover not only the secondary air passage 5 but also the inner flame hole 9 provided on the outer periphery. A slightly drooping soup cutter 101 is formed so that the soup falls from the inner flame hole 9 to the slope portion 31 on the outside. Further, the distance between the inner flame hole 9 and the cap 10 is selected to be relatively small, and the half-burned part 95 of the flame of the inner flame hole 9 hits the cap 10, and the guide is sloped so that the outer side is higher. Cap 1 by face 102
0, complete combustion occurs at the stage when it rises to the outside of the outer periphery of the cap 10, and a portion 96 in a complete combustion state with high temperature is generated.

Therefore, the boiling liquid does not enter the inner flame hole 9, which is provided upward, and the flame in the inner flame hole 9 is generated upward and far inward than the flame in the main flame hole 7, so that the heat distribution is good. Become. Furthermore, since the flame from the inner flame hole 9 once hits the cap 10, a lift prevention effect is achieved, and a stable combustion condition is obtained.

<Effects of the Invention> As is clear from the above-mentioned embodiments, the gas burner with the inner flame hole of the present invention has the flame of the inner flame hole hitting the cap that covers the upper part of the inner flame hole in a semi-combusted state, and the flame from the inner flame hole hitting the cap covering the upper part of the inner flame hole in a half-burned state, and the flame from the inner flame hole hitting the cap covering the upper part of the inner flame hole, and the flame from the inner flame hole hitting the cap covering the upper part of the inner flame hole, and the flame from the inner flame hole hitting the cap covering the upper part of the inner flame hole. Complete combustion is achieved at the outer position.

Therefore, there is no need to generate the flame in the inner flame hole in a radial direction avoiding the cap, and the flame is completely combusted when it goes outside the cap and rises, so the heat is not concentrated on the outer periphery of the burner and can be heated appropriately. It becomes easy to obtain the distribution. In addition, even if the inner flame hole is provided upward, the boiling liquid will not enter, and the cap's ability to prevent boiling liquid will be fully demonstrated.
Since the flame from the inner flame hole hits the cap once, it has the effect of making it difficult to lift even when the flame is high, and it is possible to provide a gas appliance that is easy to use and maintain.

Further, when the cap is provided with a guide surface that guides the flame to the outside, there is an effect that the flame comes out more easily to the outside of the cap, and it becomes easier to obtain a good combustion state.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of an embodiment of the present invention, Fig. 2 is a partially cutaway view of the same, Fig. 3 is a bottom view of the burner top, Figs. (b) is an enlarged bottom view and perspective view of the main flame hole, Figure 5 is a sectional view of the inner flame hole, and Figure 6 is a cross-sectional view of the inner flame hole.
The figure is an explanatory diagram of the combustion state of the flame in the inner flame hole. 1...burner head, 3...burner top, 5...
・Secondary air passage, 7... Main flame hole, 9... Inner flame hole, 1
0...Cap, 95...Part in half-burned state, 96
. . . Part in complete combustion state, 102 . . . Guide surface.

Claims (2)

[Claims] (1) In a gas burner with an inner flame hole that is equipped with a cap that covers the upper part of the secondary air passage provided in the center, the upper part of the inner flame hole is covered with the cap, and the flame in the inner flame hole is capped when the flame is in a semi-combusted state. A gas burner with an inner flame hole, characterized in that the burner is configured so that complete combustion occurs at a position outside the outer periphery of the cap. (2) A gas burner with an inner flame hole according to claim 1, wherein a guide surface is provided on the outer circumferential portion of the cap to guide the flame that hits the cap to the outside of the cap.