| 摘要 |
PURPOSE:To enable vertical turn-over and common use of nozzle boxes and to disperse erosion, by a method wherein an upper half and a lower half nozzle box are so formed symmetrically that they can be vertically turned over and commonly used, and a shim is mounted to the in-law part of each nozzle box. CONSTITUTION:Upper and lower half nozzle boxes 4a and 4b are formed in the same shape with each other, and respectively have respective holes in which a holder bolt 13, a stud bolt 14, and a crash pin 20 are mounted. The in-law parts of the nozzle boxes 4a and 4b are both a recessed part, and a shim 21 is mounted in a nozzle box recessed part, intended to form an upper half, by means of a screw 22 to form a projection. The shim 21 is also mounted to a lower half to bore a screw hole 23b. When the nozzle boxes are turned over upside down, the shim 21 is mounted to, for example, the nozzle box being the previous lower half nozzle box 4b by means of the screw 22 to form a projection, and this completes vertical turn-over without a trouble. This enables dispersion of erosion which is heretofore concentrated to the particular spot of the upper nozzle box 4a.
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