Patent ID: 8215952

Claim:
A burner having a variable output structure for a gas boiler, the burner comprising: a stationary plane flame-hole plate that includes a plurality of stationary flame holes located on a surface of the flame-hole plate, the surface being exposed to a combustion chamber, and the stationary flame holes being uniformly spaced all over the surface; and a movable plane flame-hole plate that is configured to be movable against the stationary plane flame-hole plate while keeping contacting with the stationary plane flame-hole plate and a plurality of variable flame holes located at positions corresponding to the stationary flame holes of the stationary plane flame-hole plate, the variable flame holes being uniformly spaced all over a surface of the movable plane flame-hole plate and being respectively disposed at a respective position corresponding to a respective position of the respective stationary flame hole of the stationary plane flame-hole plate, wherein said variable flame holes are formed of the same shape as said stationary flame holes, wherein a number of the variable flame holes are same as a number of the stationary flame holes, wherein the stationary plane flame-hole plate and the movable plane flame hole plate are formed between a gas-air mixing chamber and the combustion chamber all along therebetween, and wherein the movable plane flame-hole plate is movable to equally adjust an amount of each open area of all the flame holes of the stationary plane flame-hole plate and then to adjust an output of the burner according to a required load, while maintaining the pressure of gas supplied to the burner at a predetermined value or above.