| 摘要 |
<p>1,158,449. Aerators. RICHARDS OF ROCKFORD Inc. 11 Aug., 1967 [12 Aug., 1966], No. 37050/67. Heading B1C. [Also in Division F4] Apparatus for aerating and/or cooling water comprises a float 12, e.g. of polyurethane foam carrying a motor 24 driving an impeller 20 in a vertical tube 22. The impeller directs water upwardly onto a deflector 35 fixed to the impeller shaft 21 whence it is deflected outwardly, e.g. horizontally as shown. The upthrust of the water on the deflector partially offsets the downward load on the impeller, and thus reduces the thrust on the motor bearings. The top surface of the deflector is ribbed (Fig. 2, not shown) and spaced from a plate 30, through a hole 46 in which the motor shaft projects, to create a pressure gradient preventing water entering the hole 46. The impeller blades are formed of flat plates bevelled at their leading and! trailing edges, welded into slots in the impeller hub, and twisted along their lengths. In another embodiment (Figs. 9 and 10, not shown) a cylindrical housing (71) is mounted on the float, and the water is deflected by the deflector outwardly and upwardly to hit the walls of the housing and run down into the water in which the apparatus floats. The housing is opentopped to allow air to circulate for cooling.</p> |
