Impeller Diffuser Pump (from Internet Glossary of Pumps)
Impeller Diffuser Pump
The efficiency of the Impeller Pump can be greatly increased by the addition of stationary Diffuser Vanes. Large Impeller-diffuser pumps can achieve efficiency ratings of 90 percent.

The number of diffuser vanes is always different than the number of impeller vanes. This is so that the edges of the rotating impeller vanes do not come close to all the ends of the diffuser vanes at the same time.

This prevents thumping or knocking, and excessive buildup of pressures.

In this drawing the innermost set of vanes revolves and the outer set is stationary.

(This is a still representation and possibly also a low-resolution image of a pump which is fully animated in the CD-ROM version of this glossary.)

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