| 主权项 |
1. A combustion plate for a totally aerated combustion burner in which a multiplicity of flame holes for ejecting a premixed gas are formed in a plate main body of ceramic make,
wherein the flame holes of an equal diameter are evenly formed over an entire surface of a combustion region of the plate main body in such a positional relationship that adjoining three flame holes form an equilateral triangle, and wherein, provided that a flame hole group which is made up of six flame holes disposed in a positional relationship to form an equilateral hexagon and one flame hole in a center thereof is defined as a unit flame hole group when disposed adjacent to another flame hole group across a large equilateral hexagon which is made up of a flame hole at each of the corner portions and a flame hole in a middle of each of the sides of the large equilateral hexagon, a bottomed hole is formed in the surface of the plate main body in a manner: to be coaxial with the flame hole in the center of each of the unit flame hole groups; to be smaller than a diameter of a circle circumscribing the six flame holes that are in such a positional relationship as to form the equilateral hexagon; and to be larger than a diameter of a circle inscribing the six flame holes, whereby the premixed gas ejected from the six flame holes has a velocity component toward a center of the bottomed hole, wherein each of the six flame holes which make up the flame hole group is located next to one of the twelve flame holes and next to the flame hole in the center, wherein the six flame holes are open for ejecting a premixed gas; wherein, provided that a predetermined diagonal direction of, or an opposing direction of predetermined opposite sides of, the equilateral hexagon to be constituted by six flame holes in the unit flame hole group is defined as a row direction, at least a plurality of such flame holes out of twelve flame holes which are located away from the bottomed hole are closed to prevent ejecting the premixed gas as are positioned on the large equilateral hexagon that encloses each of the unit flame hole groups belonging to a selected row, the selected row being selected at a predetermined distance in a direction perpendicular to the row direction out of the unit flame hole groups arrayed in the row direction, and wherein the predetermined distance is set such that, where the row direction is the diagonal direction, at least three non-selected rows are present between each of the selected rows and that, where the row direction is the opposing direction of the opposite sides, at least two non-selected rows are present between each of the selected rows. |
