JPH01155108A - Pre-mixing type gas burner - Google Patents

Abstract

PURPOSE:To make it possible to reduce the generation of CO and NOx and compact the size of components or save the number of components, by providing a plurality of groove members on the upper surface of a burner plate, installing a large number of gas ejection outlets on the bottom face of the groove member and installing a large number of air ejection outlets on the sides of said groove members. CONSTITUTION:A fuel gas is introduced into a gas inlet 2. From a gas distribution pipe 4, the gas is equally dispersed into a plurality of gas supply channels 6 bored on a burner plate 1. Through the gas supply channels 6, the gas flows into the burner plate 1, and is uniformly ejected from gas ejection outlets 8, which are opened on bottom surfaces 10a of groove members 10 by way of vertical branch holes 13. On the other hand, combustion air is introduced into an air inlet 3. From an air distribution pipe 5, the air is equally dispersed into a plurality of air supply channels 7 bored on the burner plate 1. Through the air supply channels 7, the air flows into the burner plate 1, and passes through horizontal channels 11 or 12 from the vertical branch channels 13, and is ejected from air ejection outlets 9 which are opened to both sides of the groove sections 10 in a direction where the air crosses the fuel gas. It is, therefore, to possible to complete the mixing of the air with the fuel gas instantly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pre-mixing gas burner used in gas water heaters and the like.

[Conventional technology]

Gas hot water heaters for home use are strongly desired to be made more compact in order to improve installation ease, harmonize with buildings, and make effective use of dead space.

Traditionally, gas water heaters use a Bunsen type svarna, which is advantageous for controlling the air-fuel ratio and flame stability, and promotes the diffusion of secondary air to enable high-load combustion. Various forms have been proposed.

In addition, attempts are being made to consider a high-load combustion method using a fully premixed gas burner, which eliminates the need for secondary air diffusion.

[Inventiveness! [Problems to be resolved] Gas supply 'ILA
(In order to make a more compact, it is necessary to downsize the combustion part, combustion space, etc., which occupy a high volume ratio in the product.

However, when using a Bunsen gas burner,
By promoting the diffusion of secondary air, it is possible to shorten the flame to some extent and reduce the combustion space, but it is difficult to make the product significantly more compact.

On the other hand, in the case of a fully premixed gas burner, there is no need to diffuse secondary air, so a short flame can be achieved, and the combustion space can be made smaller than in the case of a Bunsen burner. However, in order to maintain a balance between the ejection speed of the premixed gas from the flame mouth and the combustion speed and prevent the flame from blowing out, it is necessary to increase the air ratio (ratio of combustion air to the theoretical air value). Can not. For this reason, the combustion gas becomes high temperature, and environmental pollutants such as carbon monoxide (hereinafter referred to as CO) and nitrogen oxides (hereinafter referred to as NOx) in the combustion gas become highly concentrated, and the dew point due to low air ratio combustion. There are drawbacks such as the need for a drainage treatment device because corrosive drainage tends to occur during heat exchange between the combustion gas and water due to the increase in water. In addition, gas with a fast combustion rate may cause backfire depending on the conditions, and the dimension at which the premixed gas blows out at the flame opening must be less than the extinguishing distance, which increases the pressure loss in the burner and The disadvantage is that the fan that blows the air is large. Furthermore, there are various problems such as a need for a device for pre-mixing the fuel gas and combustion air, which increases costs.

An object of the present invention is to provide a pre-mixing type sburner which does not have the above-mentioned drawbacks and is capable of high-load combustion.

[Means for Solving the Problems] and [Embodiments] The structure of the premixed gas burner according to the present invention will be explained using the embodiments shown in FIGS. 1 to 4.

Figure 1 is a plan view of a svarna in which the pre-mixing type of the present invention
The figure is a side view, FIG. 3 is a sectional view taken along line AA in FIG. 1, and FIG. 4 is a sectional view taken along line BB in FIG. 2.

Basically, there is 1 burner plate and 2 gas ports at one end.
Iiii+, from a gas supply means consisting of a gas distribution pipe 4 whose other end is connected to the burner plate 1; and - from an air supply means consisting of an air distribution pipe 5 having an air population 3 and whose other end is connected to the burner plate 1; It is configured. Furthermore, four grooves 10 are formed at equal intervals on the upper surface of the burner plate 1. Reference numeral 8 denotes eight gas ejection ports provided at equal intervals in the vertical direction in the center of the bottom surface 10a of each groove portion 10, and reference numeral 9 refers to air holes provided on both side surfaces 10b of the groove portion 10 corresponding to the positions of the gas ejection holes 8. It is a spout.

Reference numeral 6 denotes a gas supply passage bored in the lower part of each groove 10 of the burner plate 1, which is connected to the gas ejection hole 8 through a vertical branch hole 13, and has one end opening connected to a gas distribution pipe 4 having a gas population 2. is connected to.

7 is an air supply passage bored between the gas supply passages 6 in the lower part of the burner plate 1, and is connected to the air outlet 9 via a vertical branch hole 13 and a horizontal branch hole 11 or 12;
One end opening is connected to an air distribution pipe 5 having an air population 3.

[Effect]

The present invention has the above-described configuration, and the fuel gas is guided to the gas population 2 and is evenly distributed in the gas distribution pipe 4 to a plurality of gas supply passages 6 formed in the burner plate 1. The gas flows into the burner plate 1 through which it passes, passes through the vertical branch holes 13, and is uniformly ejected from the gas jet ports 8 that open at the bottom surface 10a of the groove portion 10.

On the other hand, combustion air is led to air distribution pipe 5
The air is evenly distributed over a plurality of air supply passages 7 drilled in the burner plate 1 at the time, flows into the burner plate 1 through which the air supply passages 7 pass, and flows from the vertical branch passage 13 to the horizontal branch passage 11.
or 12 and flows out from the air jet ports 9 opening on both side surfaces 10b of the groove portion 10 in a direction perpendicular to the fuel gas.
Mixing with 24 material gas is completed instantly. Since gas and air are supplied independently in this way, there is no backfire during combustion, and there is no need to ensure a long extinguishing distance to prevent backfire, reducing pressure loss and making the fan more compact. becomes possible.

In addition, even if the air ratio is increased to a large value, the combustion temperature will not be blown out, so the combustion temperature, which strongly affects the production of IjO, NOx, etc., can be easily adjusted by changing the air J11, thereby suppressing environmental pollutants. Can be done. moreover,
Since the mixing of fuel gas and combustion air is completed instantaneously in the groove 10 of the burner plate 1, it is possible to carry out high-load combustion equivalent to or higher than that of a fully premixed burner, and the burner plate 1 itself acts as a mixing gas. Since it has the function of 2J of mixing required in the case of a fully premixed burner, it becomes unnecessary.

Note that the pre-mixing type svarna according to the present invention is not limited to gas, but can also be applied to the case where liquid fuel such as kerosene is vaporized and burned.

〔Effect of the invention〕

According to the premixed gas burner according to the present invention, while performing high-load combustion equivalent to or higher than that of a fully premixed gas burner,
It is possible to easily reduce the generation of NOx, etc., and it is possible to downsize or omit the parts that make up the combustion device, making it possible to make the product more compact and reduce costs.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a pre-mixing type svarna of the present invention, Fig. 2 is a side view of Fig. 1, Fig. 3 is a sectional view taken along line A in Fig. 1, and Fig. 4 is a n-n of Fig. 2. -n sectional view. Explanation of symbols 1...Burner plate 2...Gas inlet 3...
Air population 4...Gas distribution pipe 5...Air distribution pipe 6...Gas supply path 7...Air supply path
8...Gas outlet 9...Air outlet
10...Groove portion 10,...Bottom surface 10b...
・Surface measurement 11.12.13... Branch hole

Claims (1)

[Claims] 1. Consisting of a burner plate, a gas supply means and an air supply means connected to the burner plate, a plurality of grooves are provided on the top surface of the burner plate, and a large number of gas jets are provided on the bottom surface of the grooves. A pre-mixing type gas burner characterized by having an outlet and a number of air jet ports provided on the side surface of the groove. 2. The pre-mixing device according to claim 1, wherein the air jet ports are formed on corresponding sides of gas jet ports provided at equal intervals in the vertical direction of the bottom surface of the groove portion. type gas burner. 3. The gas supply means is characterized in that a plurality of gas supply passages from a gas distribution pipe are connected to the gas outlet through a number of branch holes drilled in the burner plate. Mixed type gas burner. 4. The air supply means is characterized in that a plurality of air supply passages from an air distribution pipe are connected to the air outlet through a number of branch holes drilled in the burner plate. Mixed gas burner.