Discharge

FIGURE 5 Self-cleaning filter assembly

is used for lubrication of the bearings and cooling of the motor. This fluid remains in the motor section and is circulated through the rotor cavity by an auxiliary impeller, which is an integral part of the rotor assembly. The fluid in the motor section is forced across the rotor and through the bearings, after which it flows through a heat exchanger. The heat exchanger is cooled by water or a suitable heat transfer fluid (see Figure 7). The motor section can be backflushed with a clean, cooled liquid when handling slurry.

In Hydraulic Institute Standard ANSI/HI 5-1-5.6, Figure 5.9 provides an excellent description of various recirculation flow plans for sealless pumps.

Thrust Balance Because most canned motor pumps use hydrodynamic bearings, the rotating assembly is allowed to float axially. This movement is known as "end play" and is defined as the movement of the rotor, in the axial direction, between the forward and

Recirculation Tubing

FIGURE 7 Isolated motor section

Recirculation Tubing

FIGURE 7 Isolated motor section

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Survival Treasure

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