| 摘要 |
1412571 Electric motor pump units VORTEX-PUMPEN AG 2 Oct 1972 [7 Oct 1971] 45311/72 Heading H2A In a submersible pump unit having bare conductors cooled by a pumped fluid, a main pump is formed by a stator 20, 23, a squirrel cage rotor 22 and an impeller 34, and is operative to drive fluid along a path 41<SP>1</SP>, 41, e.g. in a nuclear reactor (Figs. 1, 2, not shown), whilst a subsidiary pump 28, of the same type, is operative to drive a separate coolant fluid, e.g. water around a closed path 29, 30, 31 inside the casing 26 of the unit, the latter fluid absorbing heat dissipated in the bare conductor winding 24 of the main stator and giving it up to the external fluid through the casing wall 27. The winding 24 comprises a series of one or two turn coils, and the P.D. between the conductors is insufficient to cause short-circuiting through the fluid. The rotor/impeller 22/34 is supported on a ball bearing 39 in a two-part spherical dish 33/33<SP>11</SP>, and includes a cage 37 and an axial blade ring 35, and the external fluid, e.g. liquid metal or water enters the unit via a radial blade ring 43. The unit may be suspended, by supply leads 25 for the stator windings. In a further submersible pump unit (Fig. 4, not shown), the pumped fluid enters the unit (via ports 45, 46) and flows directly over the bare conductors of the stator winding (24), no subsidiary cooling/pumping system being required. |
