| 摘要 |
Rotary shaft (220), housing (250) and packaging type seal (230) together form seal cavity (260). Seal cavity throat protector (200) in cavity (260) protects seal (230) against damaging materials from the region of impeller (210). Such material is directed away from seal (230) along spiral groove(s) (280) on inner surface of protector (200) with the assistance of flushing fluid entering cavity (260) via bore (270) and passing to inner surface of protector (200) via radial bores therethrough.
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