FIXED SWIRLER, AIR BUBBLE GENERATION DEVICE USING THE SAME AND BATH HOT WATER SUPPLY APPARATUS

摘要

PROBLEM TO BE SOLVED: To prevent flow passages among vanes from being clogged with foreign substances without causing a disturbance of swirling flow.SOLUTION: A fixed swirler 10 comprises a cylindrical tube portion 11 and a plurality of vanes 12 that protrudes inward in a radial direction from an inner wall surface 11A of the cylindrical tube portion 11. Inter-vane flow passages 13 are provided among the plurality of vanes 12 adjacent to one another. Further, the fixed swirler 10 is configured such that each of interval dimensions among the vanes 12 adjacent to one another becomes a maximum value at each position corresponding to the inner wall surface 11A of the cylindrical tube portion 11 and becomes smaller than the maximum value at each position inwardly spaced apart from the inner wall surface 11A in the radial direction. On account of this, foreign substances can be smoothly discharged downstream from among respective vanes 12 by utilizing movement of the foreign substances reaching the vanes 12 from an upstream side to positions of the inner wall surface 11A by centrifugal force and clogging with the foreign substances can be prevented.