| 主权项 |
1. A heating furnace unit, comprising:
a mounting panel; a burner assembly mounted to one side of said mounting panel, said burner assembly having at least one burner located therein; and a heat exchanger mounted to an opposite side of said mounting panel, said heat exchanger having at least one continuous combustion tube, wherein said combustion tube includes at least a first pass and a second pass, said first and second passes interconnected by a curved pass of said combustion tube, one end of said combustion tube having a first opening that is coupled to said burner assembly, wherein
said combustion tube has at least three zones,a converging first surface of said first zone said first surface extending an entire length of the first zone and converging towards a direction of a flame emitted by the one burner during an operation of the heating furnace and forming a first non-straight angle with a diverging second surface of said second zonesaid second surface extending an entire length of the second zone and diverging away from said direction of said flame,said second surface has a second non-straight angle with a third surface of said third zone,said first zone is nearest of said three zones to said burner assembly and extends to said first opening and said second zone is in-between said first zone and said third zone,said first, second and third zones are within a flame length configured to be emitted from said burner,said first non-straight angle is located on said opposite side of said mounting panel, andsaid first non-straight angle and said second non-straight angle are within said first pass and are nearer to said first opening upstream end than said curved pass. |
