Flame structure of gas burner

Abstract

A fire hole part structure of a gas burner, which is constructed to be manufactured at a low cost, can improve flame stability, and can prevent incomplete combustion due to the length of flame. The structure is provided to a premixing ignition burner, which is installed to apply heat to a heat exchanger of a boiler, and includes fire hole pieces which are installed parallel to one another in mounting openings of a burner body, and each of which is defined with fire holes at regular intervals. An upper wall of at least one of the fire hole pieces is bent or curved to extend in at least two directions, and the fire holes are defined through respective surface portions of the upper wall, which extend in different directions, to face different directions.

Description

TECHNICAL FIELD[0001]The present invention relates to a fire hole part structure of a gas burner, which can improve flame stability through impingement injection of flame through fire holes and can reduce the generation of incomplete combustion products.BACKGROUND ART[0002]As a gas burner for a boiler or a water heating system, a Bunsen burner was used in the past, but a premixing ignition type burner is being mainly used these days since it can reduce the generation of pollutants and decrease the size of a combustion chamber.[0003]The premixing ignition type burner has a fire hole part which has defined therein a plurality of fire holes for injecting the premixture of fuel gas and air to thereby produce flame. A conventional fire hole part has a structure in which fire holes are defined through a single plate member comprising a flat plate or a cylindrical plate. The conventional fire hole part structure has problems in that the combustion surface thereof is likely to be distorted ...

AI Technical Summary

Benefits of technology

[0011]Thanks to the features of the present invention, due to the fact that impingement injection of flame between adjoining fire hole pieces is made possible through the fire holes, which are defined in at least two directions inclined relative to a vertical direction, a flame holding characteristic can be improved, and excellent flame stability can be maintained even in combustion under a high load. Also, because the vertical length of the flame is decreased, incomplete combustion due to contact between the heat exchanger and flame can be prevented, the size of the burner can be reduced, and the combustion load can be increased.

[0012]Moreover, by changing the shape or the arrangement of the fire hole pieces depending upon the desired performance or conditions, it is possible to provide a burner which can accomplish or further improve the above-described effects.

[0013]Furthermore, by increasing the deformation strength of the fire hole piece through bending or curving the upper wall of the fire hole piece, even when a fire hole part is constructed such that the fire hole pieces are integrally connected with one another to constitute a single plate, deformation due to thermal stress can be reduced, and it is possible to provide a fire hole part structure having improved durability.

Problems solved by technology

The conventional fire hole part structure has problems in that the combustion surface thereof is likely to be distorted or the shape of the fire holes is likely to be changed due to deformation by thermal stress, whereby incomplete combustion or backfiring can be caused.

However, this structure incurs substantial material costs, and the manufacturing procedure is complicated, so that the manufacturing costs are increased.

Also, because the configuration of a premixer is complex, pressure loss increases, the flame is unstable, and noise occurs.

Further, the fire hole part structure suffers from defects due to the characteristics of the material thereof.

For example, in the case of the metal fiber mat, since it has a certain degree of softness, the combustion surface and fire holes are likely to be distorted due to deformation by the application of force upon assembly and due to drooping after installation.

In the case of the sintered ceramic plate, as condensed water drips from the heat exchanger, arranged above the ceramic plate, the fire hole part can be adversely affected.

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