JPS5952117A - Gas burner - Google Patents

Abstract

PURPOSE:To achieve a high load combustion with an expanded TDR combustion range, by dividing and then connecting the groups of main flame ports with a clearance area formed by a flat plate having recessed portions and opposite walls of burner. CONSTITUTION:While a series of slits 2 is defined on a burner body 1, these slits 2 are divided by a plural number with a certain span apart to constitute a main flame port group 2'. A through port 11 is defined along opposite walls 10 of burner body 1, and a flame retaining board 3 is integrally provided outside the walls 10, the board 3 having recessed portions constituted to form a clearance 12. The board 3 is further constituted in such a manner that a secondary flame port 4 may be defined above the clearance 12 and the adjacent groups of main flame ports facing to a part of flame ports at opposite ends of main flame groups 2' may be connected each other by the same clearance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an fz burner which is capable of stabilizing the flame formed in the flame hole and expanding the range of stable combustion in a primary mixing type burner, and which has good flame transfer characteristics at the time of ignition. (1) Improving the combustion capacity of the burner by increasing the load on the flame hole (2) Shortening the flame length (3) Expanding the TDR combustion range G4) Improving flame transfer performance during ignition, etc. The purpose is to

The flame formed in the flame hole of a conventional gas burner is stabilized by using a main flame hole 11 consisting of a single main flame hole or a plurality of flame holes, as shown in FIGS. 7 and 8. The main flame hole and the flame hole group were constructed so as to form a flame-holding ring surrounding the main flame hole and the flame hole group, but this case had the following drawbacks. .

1) In a burner like the one shown in Fig. 7, in which the main flame holes are formed with medium small holes or slit holes at regular intervals, the oil resistance of the flame holes is very strong.
No matter where all the primary air is sucked, only 20 to 30% of the theoretical amount of air can be sucked into the combustion gas, and yellow chips are generated with butane gas and the like. In addition, repeated ignition/extinguishing may generate soot, and when incorporated into appliances such as water heaters, energy efficiency deteriorates and it is uneconomical.

2) If the main flame hole is a single small hole or slit hole, the load per unit flame hole area is about 8 to 10 times higher than that of a conventional Bunsen burner, and it is difficult to mix the mixture from the flame hole. The air ejection speed is also 3 to 6 times faster. This greatly deviates from the stable flame formation range due to the balance between the combustion speed and the air-fuel mixture 11i'' exit speed, and the main flame hole alone cannot maintain combustion, resulting in flame lift or blow-off. A flame hole structure with a small load is provided around the main flame hole, and the main flame is stabilized by the heating effect of stable flame holding. Since it is small, the variable range of the primary air ratio and combustion amount (hereinafter referred to as TDR combustion range) in which a stable flame can be formed is narrow.

3) Main flame hole groups consisting of a plurality of flame holes are arranged at regular intervals, and the flame holding holes are also installed near both ends of each main flame hole group using burners as shown in Fig. 8. The aim is to reduce the ventilation resistance, improve the primary air ratio, increase the combustion speed, and expand the stable flame formation region. However, since each main flame hole group and flame holding holes are separated and independent, the flames formed are completely separated into each flame group consisting of the main flame and the flame holding holes in the vicinity thereof. If the flame transfer characteristics from the pilot flame at the time of ignition are poor in secondary 1, and if a certain block in the flame group is extinguished during rift 1- or extinguished due to some reason during combustion, the flame transfer from the adjacent flame Y Since it is difficult to transfer flame, it has the disadvantage that it is difficult to proceed to restabilization of the flame and re-ignition.

As mentioned above, with these conventional burners, it is not possible to simultaneously increase the combustion capacity by increasing the load, expand the TDR combustion range, and increase the ignition and flame transfer V1 performance. The present invention improves these shortcomings and provides burner technology found in general-purpose V, which is compatible with combustion methods such as Bunsen burners and forced premix combustion methods, and achieves high-load combustion and expansion of the TDR combustion range. be.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 6.
(The next 11bl! I'll reveal it.

These embodiments are applied to a Bunsen burner, in which continuous slit holes 2' (il-) are provided in the burner body 1, and the slit holes 2 are provided in a plurality of holes (ij5 in the figure).
The main flame hole group 2' is formed by separating and dividing each flame hole at a constant interval. As shown in the cross-sectional view of FIG. 5, the slit flame hole 2 has a flame hole structure which is bent with a constant curvature R and has a depth Hi.

Further, as shown in FIG. 6, it is also possible to construct a flame hole which is simply bent and has a depth H. Both walls 10 of the burner body 1 have through holes 11 formed therein, and a flame holding plate 3 having an uneven portion configured to provide a gap 12 on the outside thereof is integrally attached. A secondary flame is placed above the gap 12 on the flame holding plate 3.
In addition to forming the holes 4, the main flame hole group 2' is configured to partially face the flame holes at both ends, and adjacent main flame hole groups are connected by the same gap. The gaps 12 are provided independently for each through hole 11, or the same gap 12 is provided for a plurality of through holes 11. The nozzle/I/9 attached to the nozzle holder 6 faces the primary air port 6 formed in the burner body 1.

The burner body 1 has a rectifying section 8' that stabilizes the flow of the air-fuel mixture.
and a distribution room 8. The mixing tube 7 communicates the distribution chamber 8 with the primary air opening 6 . The area ratio of the through hole 11 to the slit flame hole 2 is 8 to 20%. The rectifying part 8' is on the side Jl
, j 1 o.

The effect of the Ganubhana of the present invention having the above-mentioned structure will be described below.

The fuel that has been completely supplied to the nozzle holder 6 is ejected from the nozzle 9 at a constant pressure, and the ejected energy acts to attract primary air into the primary air port 6 with an ejector effect. - The fuel and primary air that have flowed into the hollow air vent 6 are uniformly mixed in the mixing pipe 7, and the distribution chamber 8 in the burner body 1
and flows into each slit flame hole 2 and through hole 11. The rectifying section 8' plays the role of making this flow uniform.
It is. The air-fuel mixture sent to the slit flame holes 2 forms independent main flames for each main flame hole group. The shape of the flame in the 1° flame is similar to that of a fishtail flame, in which the air-fuel mixture jet distribution spreads in a fan-like manner depending on the curvature J and depth H. On the other hand, the air-fuel mixture ejected from the through hole 11 of the side wall 10 that constitutes the rectifying section 8' collides with the flame stabilizing plate 3, decelerates in the gap 12, and becomes equalized in pressure.
It is supplied to the secondary flame hole 4 at a stable flow rate.

The flame holding holes formed in the secondary flame holes 4 burn in an independent state, and the flame base of the main flame formed in the slit flame holes 2 located at both ends of the main flame hole group 2' is applied to the flame base of the main flame. Promote combustion of the main flame. The distribution of the air-fuel mixture supplied to the slit flame holes 2 and the secondary flame holes 4 is carried out according to the ratio of the flame hole surfaces of the slit flame holes 2 and the through holes 11 described above.

In addition, the primary air ratio sucked by the nozzle ejector effect of this embodiment can be obtained to the same level as that of the Bunsen burner (60 to 7o%) by fully utilizing the increase in flame hole area by continuously providing the slit flame holes 2. is possible.

Next, the action of the flame formed in each flame hole will be described. As mentioned above, the main flames formed independently in the main flame hole group 2' are flames with a primary air ratio of 60 to 70%, so the combustion speed is sufficiently large, and the independent flames themselves are stable and the flame group Form.

Furthermore, since the main flame holes N2'u are configured to have constant intervals, secondary air can be effectively introduced between the main flames. In addition, since the main flame has a fan-shaped ejection distribution, it spreads widely and becomes like a fishtail flame as shown in Figure 6. Since the contact area with the secondary air becomes large, the flame length becomes known, and the volume of the combustion chamber increases. can be made compact.

The flame stability of the secondary flame hole 4 is fixed depending on the flame hole load, and by burning each one independently, an effective reaction with the secondary air is promoted. 1. In this state, the main '/k (c
(kg flame is produced. Since the lift of the oil flame starts from the flame holes at both ends, the flame holding effect described in - is achieved, and the main flame: Increases the combustion speed by promoting the heating r1'!8 of the 1Hti part, and the cooling Amount+
By indirectly heating the main flame premixture, it is possible to improve combustion performance, prevent the occurrence of yellow chips, realize efficient combustion, and achieve high defectivity. The TDR combustion range is expanded by maintaining a constant combustion of 0.4' even in extreme gasification and high load areas.

2. The shape of the through hole 11 is selected so as to minimize the flame hole surface area of the through hole 11, or to slightly increase the amount of flame produced at both ends of the main flame hole group 2', or the shape of the burner wall 1o is By adjusting the position of the through hole 11 so that the length of the flame holding flame is near the flame base of the main flame, it is possible to minimize the obstruction of secondary air flowing into the main flame due to flame holding. Since both ends of adjacent main flames are connected by flame holding formed in the same secondary air hole 41, the flame transfer from the pilot flame during ignition is easily performed. In addition, if a block in a flame group is extinguished due to some reason during combustion, the adjacent flame group will be stabilized and re-ignited by flame holding.

As is clear from the following explanation, according to the burner of the present invention, by dividing the main flame hole group, controlling the ejection distribution, and introducing a flame holding function that partially connects adjacent main flames, The following effects can be obtained.

(1) Main flame hole ■: By completely dividing the main flame hole, the contact area with secondary air increases, the flame length is shortened, and a compact combustor can be realized.

(2) The combustion capacity of the burner can be increased by increasing the load on the flame hole by increasing the contact area with secondary air and flame holding.

(3) Due to flame holding, a stable flame is formed even in a high-deficiency vaporization region or a high load region, and the TDR combustion range is expanded.

(4) By applying a gold film in front of the flame-holding device that keeps the main flame at full speed, the obstruction of secondary airflow to the main flame active area is minimized, suppressing the generation of yellow chips, and improving fire transfer performance during ignition. will improve.

[Brief explanation of drawings]

Fig. 1 is a plan view of a Bunsen burner to which the present invention is applied, Fig. 2 is a front view of the same, Fig. 3 is a three-dimensional view of 11 with the flame-holding plate 3f removed in Fig. 2, and Fig. 4 is FIG. 6 is a cross-sectional view of a burner showing the relationship between the main flame and flame holding; FIG. 6 is a cross-sectional view of a burner according to another embodiment of the present invention; FIG. The figures are a perspective view of a conventional burner, a plan view and a front view showing other examples of the conventional burner. 1... Burner body, 2... Slit flame hole, 2'... Main flame hole group, 3... Flame holding plate, 4... ...Secondary flame hole, 6...Side wall, 11
...Through hole, 12...Gap. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] It has continuous flame holes, the flame holes are divided into multiple groups to form a main flame hole group, and a flat plate having uneven parts is fixed to both sides of the burner wall below the main flame hole group, A gas burner in which a gap formed by the flat plate and both walls of the burner partially faces the flame holes at both ends of the flame hole group, and adjacent flame hole groups are connected by the same gap.