JPH0820058B2 - Premixed gas burner - Google Patents

Description

TECHNICAL FIELD The present invention relates to a premixed gas burner used for a water heater, a heater, and the like.

[Conventional technology]

Improved installability for household gas water heaters, heaters, etc.
There is a strong demand for compactness in terms of harmony with buildings and effective use of dead space. And, conventionally, in the above-mentioned equipment, an air-fuel ratio controllability, a Bunsen type gas burner effective for flame stability is used, and various forms for promoting diffusion of secondary air to enable high load combustion are available. Has been proposed.

In addition, a study has been made on a high-load combustion system using a fully premixed gas burner that does not require diffusion of secondary air.

[Problems to be solved by the invention]

However, in the case of the Bunsen type gas burner, the diffusion of secondary air is dominant with respect to the flame length, and it is difficult to make the combustion space significantly small, and it is difficult to make the product sufficiently compact.

On the other hand, in the case of the all-premixed gas burner, it is not necessary to diffuse the secondary air, the flame can be shortened, and the combustion space can be made smaller than in the case of the Bunsen type gas burner.
However, the air ratio (the ratio of the combustion air amount to the theoretical air amount) cannot be increased in order to prevent the flame from extinguishing.

For this reason, the combustion gas has a high temperature, and there is a drawback that environmental pollutants such as carbon monoxide (hereinafter referred to as CO) and nitrogen oxides (hereinafter referred to as NOx) in the combustion gas have a high concentration.
Also, in the case of gas with a high combustion speed, flashback may occur depending on the conditions, and it is necessary to make the size of the flame opening part less than the extinction distance, so the pressure loss in the burner part increases and the fan for sending combustion air becomes large. There is a drawback. Further, there are various problems such that a device for premixing the fuel gas and the combustion air is required and the cost is increased.

An object of the present invention is to provide a premixed gas burner capable of high-load combustion without the above-mentioned drawbacks.

[Means for Solving Problems] [Embodiment] The structure of the gas burner according to the present invention will be described with reference to the embodiments of FIGS. 1 to 5. FIG. 1 is a plan view of a burner plate used in a premixed gas burner according to the present invention,
2 is a bottom view of the burner plate shown in FIG. 1, FIG. 3 is a sectional view taken along the line AA of FIG. 1, FIG. 4 is a sectional view taken along the line BB of FIG. 1, and FIG. It is an important section sectional view of a premixing type gas burner.

The burner plate 1 is provided with a gas passage 12 and an air passage 15 by a large number of holes that are vertically inclined.
On the upper surface 9 of the burner plate 1, the gas outlet 11 of the gas passage 12 and the air outlet 14 of the ventilation passage 15 are evenly arranged over the entire surface so that the air outlet 14 surrounds the gas outlet 11. On the other hand, on the lower surface 8 of the burner plate 1, the gas inflow port 10 in the gas passage 12 and the air inflow port 13 in the air passage 15 are separately arranged. Two
Is a burner case for fixing the burner plate 1, and a gas distribution chamber 6 and an air distribution chamber in which a gas inlet 10 and an air inlet 13 on the lower surface 8 are partitioned by a partition plate 3 on the lower surface 8 side of the burner plate 1. 7 is provided. Reference numeral 4 is a gas introduction hole, and 5 is an air introduction hole.

[Action]

The present invention is configured as described above, and its operation will be described. First, the fuel gas and the air are introduced into the gas introduction hole 4 and the air introduction hole 5, respectively, and a large number of gas inlets 10 and an air flow opening in the lower surface 8 of the burner plate 1 in the gas distribution chamber 6 and the air distribution chamber 7 are introduced. It uniformly flows into the inlet 13. Next, the gas passage 12 and the air passage 15 which are inclined reach the upper surface 9.

On the upper surface 9, the air outlet 14 surrounds the gas outlet 11, so that the fuel gas and the air complete the mixing in an instant. Since the fuel gas and the air are supplied independently as described above, there is no flashback, and the air is not blown out even if the air ratio fluctuates to some extent.

Also, the combustion temperature, which greatly affects the production of CO, NOx, etc., can be easily adjusted by changing the amount of air, and it is not necessary to secure a flame-extinguishing distance to prevent flashback, and the fan can be compact. . Further, since the fuel gas and the air are instantaneously mixed on the upper surface 9 of the burner plate 1, it is possible to obtain the same combustion as that of the all-premixed gas burner, so that the combustion space can be downsized, and the burner plate 1 itself. Has a function as a mixer, the mixer is not required. The premixed gas burner according to the present invention is not limited to gas, but can be applied to the case of vaporizing and burning liquid fuel such as kerosene.

〔The invention's effect〕

According to the premixed gas burner according to the present invention, CO while performing higher load combustion than the premixed gas burner,
It is possible to easily reduce the generation of NOx and the like, and it is possible to downsize or omit the components that form the combustion device, which makes it possible to make the product compact and reduce the cost.

[Brief description of drawings]

1 is a plan view of a burner plate used in a premixed gas burner according to the present invention, FIG. 2 is a bottom view of the burner plate shown in FIG. 1, FIG. 3 is a sectional view taken along line AA of FIG. FIG. 4 is a sectional view taken along the line BB of FIG. 1, and FIG. 5 is a sectional view of a main part of the premixing gas burner according to the present invention. Explanation of symbols 1 ... Burner plate, 2 ... Burner case 3 ... Partition plate, 4 ... Gas introduction hole 5 ... Air introduction hole, 6 ... Gas distribution chamber 7 ... Air distribution chamber, 8 ... Bottom surface 9 ... Top surface, 10 ... Gas inlet 11 ... Gas outlet, 12 ... Gas passage 13 ... Air inlet, 14 ... Air outlet 15 ... Air passage

Claims (2)

[Claims] 1. A gas outflow port and an air outflow port surrounding the gas outflow port are provided on the upper surface by a large number of vertically inclined hole portions, and a gas inflow port and an air inflow port are separately arranged on the lower surface. A premixed gas burner, characterized in that a burner plate having a gas passage and an air passage having the above is formed, and a means for supplying gas and air is provided on the lower surface side of the burner plate. 2. A gas distribution chamber and an air distribution chamber, wherein gas and air supply means are provided on the lower surface side of the burner plate in the burner case for fixing the burner plate, partitioning the lower gas inlet and the air inlet. The premixed gas burner according to claim 1, characterized in that