| 摘要 |
<p>PURPOSE:To prevent a turbulent flow near the corner in a connecting tube by engraving a spiral groove in a flowing direction of water on the inner surface of a smoothly bent channel in which the water flows in from the ends of two directions symmetrical in Y state and flows out from the tapered contracted ends of the other direction. CONSTITUTION:The minimum radius of curvature of the inner surfaces of the channel of a connecting tube 1 is three times or more as large as the diameters of water supply tubes 1a-1c. A plurality of grooves 4 each having an arm shape are spirally arranged on the inner surface of the channel of a connecting tube 2 in the flowing direction of boiler supply water. The channel of the tube 2 at its outlet side is contracted in a tapered state toward a downstream. Thus, boiler supply water to be fed from a water supply pump No. A or B flows along the inner surface of the channel of the tube 2 having large radius of curvature and formed in a smooth Y state and the grooves 4 of the arm shape spirally formed on the inner surface of the channel to a boiler. In this manner a turbulent flow scarcely occurs.</p> |
