| 摘要 |
A rotary impeller pump having a permanent magnetic drive is disclosed. An impeller disposed on a rotating shaft which is supported by a bearing assembly within a housing assembly. The bearing assembly is supported by a fixed ring assembly having a channel disposed therethrough, with one open end of the channel terminating above and adjacent the bearing assembly. A scoop wheel is disposed to rotate with the impeller and shaft. The scoop wheel raises fluid from a location below the bearing assembly to a location above the bearing assembly and adjacent a second open end of the channel. During normal operation, the housing assembly is substantially filled with the fluid medium to be pumped, and the fluid medium provides lubrication and cooling for the bearing assembly. Accordingly, if the pump is accidentally operated when a substantial portion of the fluid is drained from the interior of the pump, the scoop wheel ensures adequate lubrication by scooping residual fluid which collects at the bottom of the pump to a location adjacent the second open end of the channel, with the scooped fluid circulating through and lubricating the bearing assembly via the channel.
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