| 摘要 |
The jet units 1 of a whirlpool-bath system (Figs 1, 2) each include a convergent nozzle 18 for supplying water under pressure from a tube-section 17 to a divergent outlet 12, across an air gap 20 within a chamber 19. Discharge of water from the nozzle 18 across the gap 20 into the hollow stem 13 of the outlet 12, draws air into the chamber 19 from an inlet pipe 21 from an air distribution manifold (7, Figs 1, 2). A substantially-cylindrical annular skirt 22 projects backwardly from the stem 13 to shroud the gap 20 over a nose-part 23 of the nozzle 18, so that air is constricted to enter the gap 20 through an annular pathway between them, for evening out air flow around the water stream from the nozzle 18. The cross-sectional area of the pathway increases towards the gap 20, but may be substantially uniform. The nose-part 23 may be of frustoconical shape. <IMAGE>
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