| 摘要 |
An impeller-type blower for use particularly in environments of particle contaminated air includes a housing defining an aft cavity. An impeller, including a shaft, is rotatably mounted in the housing by a bearing forward of the aft cavity. Passages communicate the aft cavity with a region forward of the bearing to provide a pressure balance on opposite sides of the bearing and, thereby, prevent particle contaminants from infiltrating the bearing.
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