JPH0523934Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a Bunsen-type gas burner capable of high-load combustion that is applied to gas water heaters and the like.

(Prior Art) In order to downsize gas water heaters, it is important to downsize the combustion chamber, which accounts for a large proportion of the volume of the product. Therefore, various gas burners that enable high-load combustion have been proposed.

BACKGROUND ART Conventionally, Bunsen-type gas burners have been used in gas water heaters because of their excellent mass productivity, reliability, and controllability. The Bunsen gas burner uses a part of the combustion air (30 to 80% of the theoretical air amount) by the ejector effect of the fuel gas ejected from the nozzle (not shown).
primary air) is sucked into the burner and ejected from the flame port as a mixed gas to form a primary flame. Furthermore, by diffusing with secondary air, it burns while forming a secondary flame. Therefore, when high-load combustion is performed, the mixed gas jetting speed from the flame port increases, causing problems such as flame elongation or flame floating.

Therefore, conventionally, in order to stabilize the flame even during high-load combustion, a plurality of main flame ports 2 form a flame port group 11 as shown in FIG.
A gas burner equipped with a side flame port 6 was used. Furthermore, a gas burner has been proposed which is based on the structure shown in FIG. 5 and has a flame port structure shown in FIG. 6, which has an improved secondary air diffusion. That is,
The flame holding plate 4 is provided with a collar portion 5 and a side flame port 6 only in the portion corresponding to the flame port group 11, and each flame holding plate 4 has a main flame port between adjacent flame port groups 11. It is connected to the side wall 8 by a stepped part 12 so as to be in contact with the side wall 8.

The flame holding plate 4 generates eddies in the wake of the collar portion 5,
It maintains the stability of the flame formed at the main flame port 2, and the side flame port 6 forms a stable flame at the base of the main flame port 2 and prevents the flame formed at the main flame port 2 from rising. The purpose is to prevent the combustion reaction by preheating the unburned mixed gas and promote the combustion reaction. The structure is such that the flame spreads into the space formed between them, and is ejected from the side flame ports 6 at the same speed as the main flame port 2.

(Problems to be solved by the invention) However, the gas burner shown in Figs. 5 and 6 has the following drawbacks, problems occur during high-load combustion, and the large size of the combustion chamber cannot be reduced. It was impossible.

That is, the gas burner with the structure shown in FIG.
Since the brim portion 5 of the flame-holding plate 4 is continuous, the diffusion of secondary air is inhibited and the flame is elongated, and the flame-holding plate 4 is heated by the flame formed at the sleeve flame opening 6. Due to deformation, the sleeve flame opening width l changed, causing problems such as unstable combustion.

On the other hand, in the gas burner with the structure shown in FIG. Diffusion is promoted and a short flame is formed, and since the sleeve flame port 6 is subdivided, it is less susceptible to the above-mentioned thermal deformation, and the sleeve flame port width l can be maintained at a constant interval.

However, since the flame formed in the side flame opening 6 becomes discontinuous at the stepped part 12, the flame transfer in the longitudinal direction of the burner becomes poor, and the secondary air flowing in from the stepped part 12 In No. 2, there was a problem that the flame formed became unstable.

(Means for Solving the Problems) (Example) The structure of the gas burner according to the present invention will be explained using the embodiments shown in FIGS. 1 to 4. FIG. 1 is a partially cutaway front view of the gas burner of the present invention, FIG. 2 is a plan view, and FIGS. 3 and 4 are cross sections A--A in FIG.
A, cross section B-B.

The basic configuration is the same as the conventional gas burner shown in FIGS. 5 and 6, and consists of a flame port group 11 consisting of a plurality of main flame ports 2, a flame holding plate 4, a side flame port 6, etc. There is. The characteristics of the gas burner according to this invention are:
This is the shape of the flame holding plate 4, which will be explained in detail below.

The collar portion 5 of the flame stabilizing plate 4 is provided at a portion corresponding to a flame port group 11 consisting of a plurality of main flame ports 2 opened at the top of the burner body 1, and a notch 10 is provided between adjacent flame port groups 11. The collar portion 5 is removed, and a dowel 7 is provided on the flame holding plate side wall 9 so as to be in contact with the main flame opening side wall 8. Further, the sleeve gas outlet 3 opens only in a portion corresponding to the burner port group 11, similar to the collar portion 5.

(Function) The present invention has the above configuration, and its function will be explained. First, regarding the diffusion of secondary air, since it efficiently flows into the burner port group 11 through the notch 10 provided in the flame holding plate 4, the diffusion is promoted, resulting in a short flame. In addition, the mixed gas ejected from the side flame gas outlet 3 spreads sufficiently in the space formed between the main flame port side wall 8 and the flame holding plate side wall 9, and then is ejected from the side flame port 6 and combusts. Therefore, it is very stable,
Furthermore, a continuous flame is formed in the longitudinal direction of the burner. Here, the side gas outlet 3 does not open between the adjacent flame outlet groups 11, so the dowel 7
A relatively small flame forms at the top of the
There is no obstruction of secondary air flowing into the burner port group 11 from the notch 10, and good fire transfer can be achieved. On the other hand, the unstable phenomenon of the flame formed at the main flame port 2 due to the inflow of secondary air, which was a problem in the past,
As mentioned above, flame is also formed on the turbo 7, so no occurrence is seen. Furthermore, since the dowels 7 provided on the flame stabilizing plate side wall 9 are in contact with the main flame port side wall 8, there is no change in the side flame port width l due to thermal deformation, and stable combustion can be maintained.

(Effect of the invention) That is, by using the flame holding plate 4 having the dowels 7 and the notches 10 according to the invention, the flame transfer performance between the flame ports is improved, and the shortening time is reduced by promoting the diffusion of secondary air. Flame formation and flame stabilization can be achieved, high-load combustion is possible, and the combustion chamber can be downsized.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of the gas burner according to the present invention, Fig. 2 is a plan view of the gas burner according to the invention, Fig. 3 is a detailed view of the flame nozzle section taken along the line A-A, and Fig. 4 is the flame nozzle section as well. In the detailed view, cross section BB is taken, FIG. 5 is a perspective view of the flame port of a conventional gas burner, and FIG. 6 is a perspective view of the flame port of another conventional gas burner. Explanation of symbols, 1...Burner body, 2...Main flame port, 3...Sleeve gas outlet, 4...Flame holding plate, 5...
...Brim portion, 6...Sleeve flame opening, 7...Dowel, 8...
Main flame port side wall, 9...flame holding plate side wall, 10...notch, 11... flame port group, 12...step push part.

Claims (1)

[Utility Model Claims] 1. A Bunsen burner comprising a group of flame ports having side walls and a top consisting of multiple main flame ports, a flame stabilizing plate fixed at the bottom at a fixed interval to the side walls and with a flange at the top, a sleeve flame port formed between the side walls and the flame stabilizing plate, and a sleeve flame gas outlet formed on both side walls within the sleeve flame port, characterized in that the flange of the flame stabilizing plate between adjacent groups of flame ports is notched, and a dowel that abuts against the side wall of the gas burner is provided on the side wall of the flame stabilizing plate below the notch of the flange. 2. A Bunsen burner characterized in that the sleeve flame gas outlet is formed on both side walls below the groups of flame ports, and is not formed on both side walls between adjacent groups of flame ports.