| 摘要 |
A system for pressurizing and pumping a fluid that may undergo substantial variations in temperature utilizes a motor (20) with an enclosed rotor (25) disposed adjacent and in driving relation to a centrifugal pump (10), but thermally isolated even though the fluid being pumped serves to establish hydrodynamic effects at large journal bearings (34) supporting the rotor (25) and the pump (10). The rotor (25) is in magnetic interchange relation with an associated stator (30) through a magnetic housing (26) which, together with a pump mount (40) coupling the motor (20) to the pump (10), is fully enclosed, apart from pump inlet (18) and outlet (19) apertures. The pump mount (40) includes a low diameter neck portion (44) about the shaft (22) that has low axial heat conductivity, thus providing an isolation spacing that also is filled with insulation material (46) to eliminate significant convective heat transfer. Pressurized fluid at the pump is communicated into the motor enclosure only via small gaps, assuring that pressure conditions are maintained, but without affecting the internal motor temperature and the stability or life of the bearings.
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