Rich-lean gas burner and mounting method thereof

Abstract

The invention discloses a rich-lean gas burner, and relates to the technical field of burners. The rich-lean burner comprises an inner shell and an outer shell; a lean side gas inlet, a rich side gasinlet, a gas mixing channel and rich side gas outlets are formed in the inner shell; the outer shell sleeves the outer side of the inner shell, and a through rich side mixing space is formed between the outer shell and the inner shell; the rich side gas inlet and the rich side gas outlets communicate with the rich side mixing space; a fire hole plate mounting section is arranged at the upper partof the inner shell; a fire hole plate assembly is arranged in the fire hole plate mounting section; a partition structure is arranged on the inner surface of the fire hole plate mounting section and enables a gap located in the upper part of the partition structure to become a non-flow region; the fire hole plate assembly comprises an inner fire hole plate and an outer fire hole plate; the inner fire hole plate is nested in the outer fire hole plate; the gas mixing channel, a gap located in the lower part of the partition structure and the fire hole plate assembly form a through lean side mixing space. The rich-lean gas burner has the advantages that through optimization design, better gas / air distribution effect can be achieved, and the adaptability of the burner can be improved.

Description

technical field [0001] The invention relates to the technical field of burners, in particular to a rich-lean gas burner and an installation method thereof. Background technique [0002] Rich-lean combustion is a method that can effectively reduce nitrogen oxides (NO X ) emission gas combustion method, which is widely used in the fields of domestic gas water heaters and domestic hot water / heating dual-purpose furnaces. [0003] When studying the gas combustion process, the mass or flow ratio between air and gas is the primary issue. The basic principle of rich-lean combustion is: divide the gas / air mixture before combustion into two parts with different gas concentrations, one part has a higher gas concentration, and the other part has a correspondingly lower gas concentration. In this way, NO can be effectively reduced X This theory has been verified and widely used in practice. For example, the Japanese patent with the publication number of JP 7-42917 introduced a rich-...

AI Technical Summary

Problems solved by technology

In the design, it is necessary to ensure that the mixed gas is evenly distributed before flowing into the fire orifice plate 3a, so as to maintain the consistency and uniformity of the final flame. In order to achieve this goal, it is necessary to continuously optimize the flow channel structure during the design process and carry out multiple mold modifications. require high cost

In addition, when the overall width of the burner is large, the fluid has a large diffusion space, and it is easy to achieve a better uniform distribution. Once the overall width of the burner becomes smaller, it is very difficult to design a good uniformity

[0006] For the above-mentioned domestic gas burners, the mold development cost is relatively large, and the development cycle is relatively long. Once the design is finalized, it is difficult to make subsequent improvements and upgrades; and there are many product models to be adapted, and it is difficult to adjust to a consistent good emission level

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