Patent ID: 9702545
Date: 2017-07-11
CPC Classifications: F23C,F23D

Claim:
1. An oil-fired burner comprising: a nozzle main body which is substantially rectangular in cross-section in a view which is orthogonal to an axial direction of the oil-fired burner; an oil gun for inputting an oil fuel disposed at a center of an outlet opening of the nozzle main body; a circular diffuser mounted on a leading end side of the oil gun; and a secondary air input port provided so as to surround an outer periphery of the oil gun, wherein the secondary air input port is constituted of: a central arc section which is substantially similar in shape to the circular diffuser; and rectangular sections which are provided continuously from left and right ends of the central arc section in a horizontal direction and each of which has a face-to-face dimension, between a top face and a bottom face, which is reduced from the face-to-face dimension of a rectangular cross-section of the nozzle main body, wherein the secondary air input port has an opening shape in which the central arc section bulges out in the vertical direction substantially concentrically with the diffuser, and wherein the oil-fired burner is disposed adjacent to an outer periphery of a fuel-fired burner.