Flame port unit structure of combustion apparatus

A flame-hole structure of a combustion apparatus, wherein the flame-hole structure has a plurality of flame-holes for forming a flame, the flame-hole structure comprising:

• a lean flame-hole part having a plurality of lean flame-holes arranged along a width direction perpendicular to a jetting direction of lean gas as flame-holes through which the lean gas is jetted, and
• a rich flame-hole part having a pair of rich flame-holes provided on opposite sides of the lean flame-hole part with respect to the width direction as flame-holes through which rich gas is jetted,
• wherein the lean flame-hole part includes a first region in which widths of the lean flame-holes along the width direction are constant along a lengthwise direction perpendicular to the jetting direction and the width direction and second regions provided on opposite sides of the first region along the lengthwise direction, the widths of the lean flame-holes along the width direction being narrower in the second regions than in the first region,
• wherein the lean flame-hole part and the rich flame-hole part are brought into close contact with each other in at least part of the second regions,
• wherein the lean flame-hole part further includes a plurality of lean plates disposed to be spaced apart from each other at a predetermined interval while facing each other along the width direction, and the lean flame-holes are formed in separation spaces between the lean plates,
• wherein the rich flame-hole part further includes a plurality of rich plates disposed to be spaced apart from each other at a predetermined interval while facing each other along the width direction, and the rich flame-holes are formed in separation spaces between the rich plates,
• wherein the plurality of lean plates include a bending portion bent toward the center of the lean flame-hole part along the width direction to form the second regions and lean plate horizontal-portions extending from opposite ends of the bending portion along a direction parallel to the lengthwise direction,
• wherein the plurality of rich plates include a protruding portion protruding toward the bending portion to correspond to the bending portion and rich plate horizontal-portions extending from opposite ends of the protruding portion along the direction parallel to the lengthwise direction,
• wherein a reference region refers to a region defined at an upper end of each of the rich flame-holes by first and second lines that are virtual lines across the rich flame-hole and a pair of rich plates configured to form part of the rich flame-hole between the first and second lines, and wherein the plurality of rich plates are designed such that in a region from at least one rich plate horizontal-portion through an adjacent protruding portion of a rich plate to another rich plate horizontal-portion, the sum of amounts of heat transferred to a pair of rich plates configured to form reference regions having the same size is substantially the same in the reference regions when a flame is generated by the rich gas.

A flame-hole structure of a combustion apparatus, wherein the flame-hole structure has a plurality of flame-holes for forming a flame, the flame-hole structure comprising:

• a lean flame-hole part having a plurality of lean flame-holes arranged along a width direction perpendicular to a jetting direction of lean gas as flame-holes through which the lean gas is jetted, and
• a rich flame-hole part having a pair of rich flame-holes provided on opposite sides of the lean flame-hole part with respect to the width direction as flame-holes through which rich gas is jetted,
• wherein the lean flame-hole part includes a first region in which widths of the lean flame-holes along the width direction are constant along a lengthwise direction perpendicular to the jetting direction and the width direction and second regions provided on opposite sides of the first region along the lengthwise direction, the widths of the lean flame-holes along the width direction being narrower in the second regions than in the first region,
• wherein the lean flame-hole part and the rich flame-hole part are brought into close contact with each other in at least part of the second regions,
• wherein the rich flame-hole part further includes a plurality of rich plates disposed to be spaced apart from each other at a predetermined interval while facing each other along the width direction,
• wherein the rich flame-holes are formed in separation spaces between the rich plates, and
• wherein the rich flame-hole part further includes a spacing part disposed in each of the rich flame-holes such that the width of the rich flame-hole along the width direction remains constant in a region of the rich flame-hole corresponding to the first region,
• wherein the lean flame-hole part further includes a plurality of lean plates disposed to be spaced apart from each other at a predetermined interval while facing each other along the width direction,
• wherein the plurality of lean plates include a bending portion bent toward the center of the lean flame-hole part along the width direction to form the second regions and lean plate horizontal-portions extending from opposite ends of the bending portion along a direction parallel to the lengthwise direction,
• wherein the plurality of rich plates include a protruding portion protruding toward the bending portion to correspond to the bending portion and rich plate horizontal-portions extending from opposite ends of the protruding portion along the direction parallel to the lengthwise direction, and
• wherein the spacing part makes contact with the rich plate horizontal-portions of the adjacent rich plates.