JPS625530Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gas burner that reduces the flame height and widens the flame stability range by improving the shape of the burner head.

Gas burners with a large number of slit-shaped flame ports have been available for some time, but these burners have two slits between the slits.
It is difficult for secondary air to enter, so the secondary flame becomes longer.
Furthermore, the slit flame opening has a drawback in terms of flame stability because it floats from both ends when the primary air ratio is large.

This invention has multiple convex parts on the burner head,
A slit flame opening is formed in this convex part, and a secondary air passage and a recess are provided between these convex parts to allow the secondary air to flow in quickly, shortening the secondary flame generated above the flame opening, and reducing the slit flame. By arranging the short sides of the openings to face each other, a circulation flow is created between the short sides, and multiple flame openings are formed on the convex part to stabilize the flame. A detailed explanation of the embodiment will be given below.

In Figure 1, 1 is a nozzle, 2 is an air intake port,
3 is a mixing tube, 4 is a slit flame opening, 6 is a convex portion having a slit flame opening, 10 is a secondary air passage formed between the slits, 11 is a concave portion forming a circulation flow,
The slit burner opening 4 is formed with opposing convex portions 6 and burner heads at opposing short sides.

FIG. 2 is a cross section taken along line A-A' in FIG.

In Figures 1 and 2, the fuel gas ejected from the nozzle 1 sucks the surrounding air through the air intake port 2,
The fuel gas and air are completely mixed through the mixing tube 3 and ejected from the slit flame port 4, forming the flame 5 shown in FIG.
form. Secondary air flows in from a secondary air passage 10 between convex portions 6 having slit flame ports 4 and is supplied to the flame 5. A circulating flow 7 is generated in the concave portion 11 between the slit flame ports 4, thereby increasing the stability of the flame 5.

This embodiment is characterized by the inflow of secondary air, and the operation of the secondary air will be described in further detail. Since the secondary air passage 10 is provided between the flames, the secondary air can easily flow in. As a result, compared to the case without a secondary air passage, more secondary air is supplied to the flame 5 without being hindered by the flame, and the secondary air is also supplied to the secondary flame as it flows in, and the secondary air is supplied to the secondary flame as it flows in. The length can be shortened. 2
The secondary air flows through the secondary air passage 10 into the recess 11 as a circulating flow 12, as shown in FIG. The width l of the secondary air passage is set to 3/8 of the long side L of the slit flame opening 4. Generally, if the distance between the slit burners is simply increased without providing a secondary air passage, l/L=1 or more is required in order to sufficiently inflow the secondary air. Then, the flame transfer between the slit flame ports becomes poor and the burner becomes large. Note that the sizes of the recess 11 and the secondary air passage 10 are not limited to those in the above embodiment, and the same effect can be obtained by forming a groove for every two rows of secondary air passages. Further, while a part of this secondary air is heated while passing through the secondary air passage 10, most of it is supplied to the flame 5 and the secondary air 8 is heated.
is fed into a circulating stream 7 forming a . Here, 9 is the primary flame.

This circulating flow 7 recirculates the hot combustion gases to the base of the flame 5 and increases flame stability. At this time, if a large amount of low-temperature secondary air flows in, the temperature of the circulating flow 7 will decrease, and the stability of the flame will decrease. On the other hand, if the secondary air flow rate is small, the circulating flow section will lack oxygen and the flame will become longer. However, in the present invention, the temperature rises while the secondary air passes between the flames, and the secondary air passage 10 is located below the flame 5 so as not to come into direct contact with the flame 5. The flame was able to be shortened because oxygen was not consumed by the flame and was supplied to the circulating flow. Further, the secondary air passing through the secondary air passage 10 also forms a circulating flow, producing the same effect as the circulating flow 7.

Here, the slit flame openings 4 are arranged in a set of two.
The features of having a set of two slit burners 4 will be explained below in comparison with the conventional technology.

Generally, as shown in FIGS. 5 and 6, a large number of slit burner ports 13 are arranged closely to form a slit burner port group, and such slit burner port groups are arranged in parallel in the longitudinal direction of the burner, and a slit burner port group is formed in between. In a gas burner having a burner head provided with a secondary air passage groove 14, when a plurality of burners are arranged in parallel, the following may occur.

○B When the burners are spaced apart and installed in parallel, the secondary air for combustion flows between the burners, but this does not result in a circulating flow as defined in the present invention.

○B When the burners are installed side by side in contact with each other, the flames come close to each other at the slit burner, and since there is no concave part in the present invention, there is little inflow of secondary air and the flame becomes longer.

Therefore, simply arranging a plurality of burners does not generate a circulating flow and is not effective in preventing flame stability or flame length.

However, when two slit flame ports 4 are arranged in parallel to increase the fuel flow rate as in the present invention, the primary flame forms an inverted flame as shown in FIG. Secondary air then flows into the primary flame to improve combustion. Furthermore, the flame stability between the slit flame openings is good. On the other hand, when the slit flame ports are arranged in three or more rows as shown in FIGS. 5 and 6, the flame ports other than the slit flame ports at both ends do not form an inverted flame, and the combustion of the primary flame is not promoted.

Also, at this time, the distance between the slit flame openings is made small to increase the temperature of the flame concentration area by the heat radiated between the flames, thereby stabilizing the flame. Furthermore, since there are two in a row and there are no recesses, there is no inflow of air. Therefore, the secondary flames formed at the two flame ports become one mass. The thickness of the secondary flame facing the recess 11 is increased to facilitate the generation of circulation flow, thereby stabilizing the flame. In addition, the secondary flame that has become a mass has a stronger buoyancy, and the secondary flame is more buoyant than the secondary air passage 10.
Since a large amount of secondary air flows in and complete combustion is facilitated, flames adjacent to each other via the secondary air passage 10 burn independently without interference. As a result, we were able to shorten the secondary flame.

As described above, in this invention, the temperature of the secondary air increases due to the flame while it passes through the secondary air passage, and this high-temperature secondary air is supplied to the recess to stabilize the flame formed in the circulating flow. let In addition, when the secondary air passes through the secondary air passage, a portion of the secondary air is supplied to the flame, and the rest is supplied to the flame downstream of the recess, thereby making it possible to shorten the flame.

[Brief explanation of the drawing]

Fig. 1 is a top view of a gas burner showing an embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A' in Fig. 1, and Fig. 3 is a view taken from a direction perpendicular to line A-A' in Fig. 1. FIG. 4 is an enlarged sectional view of the main part, FIG. 5 is a half-cut sectional view of a conventional burner, and FIG. 6 is a plan view thereof. 4...Slit flame opening, 6...Protrusion, 10...2
Next air passage.

Claims (1)

[Scope of utility model registration request] A plurality of protrusions each having a slit burner head are positioned on the burner head so that the short sides of the slit burner ports face each other, and a secondary air passage and a recess are provided between each protrusion, and the protrusions have two rows. A gas burner with a slit flame opening.