JPH05659Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> This invention relates to an improvement of a burner with an inner flame opening, which is provided with an inner flame opening in order to improve heat distribution to the bottom of the pot.

<Conventional technology and its problems> In gas burners used in gas stoves, etc., dynamic pressure is reduced at the outlet of the flame port as a flame-holding means to prevent the flame from disappearing due to lift or draft during combustion. It is well known in the art to create a vortex or a vortex. however,
Even if measures are taken to reduce the flow rate of gas (air mixture) by increasing the hole diameter on the outlet side of the inner flame port of a burner with an inner flame port, a satisfactory flame holding effect cannot be obtained. was difficult.

This is thought to be because the cross-sectional area of the inner flame port is generally smaller than that of the main flame port, so the gas ejection speed is considerably higher than the combustion speed, creating a condition where lift is likely to occur.

This invention was developed with the aim of improving the flame-holding effect by improving the shape of the inner flame opening, focusing on these problems.

<Means for solving the problems> In order to achieve the above-mentioned object, in the burner with an inner flame port of this invention, the inner flame port is configured by combining two or more slit-shaped holes, and these slits are The shaped holes are arranged at an angle such that the long axis directions of the cross sections intersect with each other when viewed from the gas ejection direction.

Figure 1 shows the shape of the inner flame opening according to this invention as seen from the direction of gas ejection, where 1 is the inner flame opening;
a and 1b are slit-like holes arranged at angles that intersect with each other, and a to c are slit-like holes 1a, 1
An example where b is one continuous hole is d to f.
1 shows an example in which slit-like holes 1a and 1b are arranged close to each other to form one inner flame opening. Note that the illustrated shape is an example, and other shapes may also be adopted.

<Operation> By intersecting the slit holes 1a and 1b, two holes are formed at the intersection of the two as shown in FIG.
A corner portion 2a where the air forms an edge-like protrusion and comes in contact with the air-fuel mixture, and a bridge portion 2b where a narrow air layer is interposed between the slit holes 1a and 1b are formed. For this reason, it is thought that a vortex is generated in this part, which prevents the occurrence of the lift phenomenon.

<Example> Next, an example will be described. Figures 2 to 6 show the first embodiment, Figures 2 and 3 are top and bottom views of the burner top, Figure 4 is a sectional view of the burner combined with the base, and Figure 5 is a cross-sectional view of the burner top. FIG. 6 is a cross-sectional view of the inner flame opening, and a perspective view of the burner top with a portion cut out.

In the figure, 3 is a burner top, and 4 is a burner base, which together constitute a burner head 5. Slit-shaped main flame ports 6 are formed at equal intervals on the outer periphery of the burner top 3, inner flame ports 1 are formed slightly inside, and a burner cap that covers the upper surface of the secondary air passage 7 is located in the center. 8
is provided integrally with the burner top 3 or by combining separate members. Reference numeral 9 denotes an auxiliary combustion chamber in which a spark plug and a thermocouple are housed, and is formed at one location on the outer periphery.

In the annular portion where the inner flame opening 1 is provided, a juice receiving groove 11 having a shallow V-shaped cross section is formed concentrically on the upper surface thereof, and a plurality of juice draining grooves 12 are formed radially, respectively. Further, in a portion inside the juice receiving groove 11, a peninsula-like protruding portion 13 is provided radially. The inner flame opening 1 is composed of a slit-like hole 1a formed almost radially, and a slit-like hole 1b formed circumferentially so as to intersect with the outer end of the slit-like hole 1a. It is provided so as to penetrate through it. An elongated recess 14 having a slightly larger width and length than the slit hole 1a is formed on the lower surface of the inner flame opening 1. The slit hole 1b first connects the slit hole 1a and the elongated recess. 14
After forming the elongated recess 1 on the upper surface of the bulge 13,
It is formed by cutting to a depth of up to 4. Therefore, the slit-like hole 1b of this embodiment has a two-stage shape, including a hole portion 1c that has a length equal to the width of the elongated hole-like recess 14 and passes through it vertically, and a groove-like portion 1d that crosses the bulge portion 13. There is.

This embodiment is constructed as described above, and the air-fuel mixture coming out of the inner flame port 1 during combustion is transmitted through the hole portions 1c of the slit-like hole 1a and the slit-like hole 1b that intersects with the slit-like hole 1a.
This creates an airflow with a T-shaped cross section, and the airflow is ejected while expanding in the longitudinal direction at the groove 1d of the slit hole 1b. Therefore, the slit hole 1
The corner formed at the intersection of a and the slit-shaped hole 1b disturbs the airflow and generates a vortex, which prevents the occurrence of the lift phenomenon and provides a stable combustion state. In addition, the ejected air-fuel mixture spreads in the groove 1d and is decelerated, which has the effect of making it difficult for the lift phenomenon to occur.Furthermore, since the inner flame opening 1 is not a round hole but a slit, the mixture is Another effect is that the contact area between the air and the secondary air is increased, and the combustion condition is improved.

In addition, in the embodiment, the slit-like hole 1a of the inner flame opening 1
are provided in parallel to each other, and on the other hand, the slit holes 1b are provided circumferentially for processing reasons, so the slit holes 1b are not perpendicular to the slit holes 1a but slightly Although the slit holes 1a intersect at an angle, it goes without saying that the slit holes 1a may be formed radially, or the slit holes 1b may be formed so as to intersect at right angles to the slit holes 1a.

Next, a second embodiment shown in FIGS. 7 to 10 will be described. This embodiment is an example in which two slit-shaped holes are arranged close to each other, and the arrangement is slightly modified from that shown at f in FIG. 1. Figures 7 and 8 are a plan view and a bottom view of the burner top, Figure 9 is a sectional view of the inner flame opening,
FIG. 10 is a side view of the inner sore opening. In addition,
The same parts as in the first embodiment are given the same reference numerals, and redundant explanation will be omitted.

The annular part on the upper surface of the burner top 3 is gently sloped so as to become lower toward the outer periphery, and two protruding parts 23 protruding in the shape of a peninsula are provided radially in pairs, the tips of which face each other. It is bent in the direction. The inner flame opening 1 is provided along the bulge 23 so as to pass through it vertically, and has a slit hole 1a formed in a substantially radial direction and a slit hole 1a formed at an angle of 90° near the outer end of the slit hole 1a. The slit-like hole 1b is formed as a whole, and the overall shape is an L-shape cut at the bent part.
They are arranged in pairs with their tips facing each other. In addition, on the lower surface of the inner flame opening 1, a set of two inner flame openings 1, 1 are provided.
A rectangular recess 24 is formed with a size that includes.

This embodiment is constructed as described above, and the air-fuel mixture that comes out of the inner flame port 1 during combustion becomes an airflow with an L-shaped cross section cut at the bend according to the arrangement of the slit holes 1a and 1b. gush. Therefore, the airflow is disturbed by the action of the bridge formed at the bend, creating a vortex, which prevents the lift phenomenon from occurring and provides a stable combustion state. Further, since the inner flame port 1 is not a round hole but a slit, the contact area between the air-fuel mixture and the secondary air is increased, and the combustion condition is improved, as in the first embodiment. .

In addition, as shown in FIG. 10, the main flame port in the part where the inner flame port 1 is formed is the main flame port 6 with a small cut.
a and 6. This is to prevent the phenomenon that if the cross-sectional area of the main flame port in this part is the same as the other parts, the amount of air-fuel mixture coming out of the inner flame port 1 will be small and combustion will become unstable. By providing the main flame ports 6a and 6b with a small cross-sectional area, a decrease in pressure in the rectangular concave portion 24 can be avoided.
In addition, since the pressure is averaged by the rectangular recess 24, the size of the flames in the four slit-shaped holes 1a and 1b becomes uniform, and the combustion state becomes stable.

<Effects of the invention> As is clear from the above-mentioned embodiments, this invention is a burner with an inner flame opening, in which the inner flame opening is constituted by two or more slit-like holes arranged at angles that intersect with each other. It is.

Therefore, a vortex is generated at the intersection of the slit-like holes, which prevents the lift phenomenon from occurring, and it becomes easy to obtain a burner with an inner flame port that does not cause lift at the inner flame port and provides a stable combustion state. be.

[Brief explanation of the drawing]

Figures a to f in Figure 1 are diagrams illustrating the shape of the inner flame opening according to this invention, Figures 2 and 3 are a plan view and a bottom view of the burner top of one embodiment, and Figure 4 is a diagram showing the shape of the burner top in combination with the burner base. A in Figure 2 in state
-A sectional view, a and b in Fig. 5 are B- in Fig. 2
B-line enlarged sectional view and C-C line sectional view of figure a, No. 6
The figure is a perspective view showing a part of the burner top cut out. 7 and 8 are a plan view and a bottom view of the burner top of another embodiment, FIG. 9 is a sectional view taken along the line D-D in FIG. 7, and FIG. 10 is a side view of the inner flame opening. . 1...Inner flame opening, 1a, 1b...Slit-shaped hole,
3... Burna top, 4... Burna base, 5...
...Burnahed, 6...Main flame mouth.

Claims (1)

[Scope of utility model registration request] In a burner with an inner flame port, which has a main flame port on the outer periphery and an inner flame port on the inside, the inner flame port is constructed by combining two or more slit-like holes, and these slit-like holes are used to A burner with an inner flame port, characterized in that the long axis directions of the cross sections are arranged at an angle such that the longitudinal directions of the cross sections intersect with each other when viewed from the ejection direction.