| 摘要 |
A seal actuated by generally atmospheric pressure helps protect the motor bearing of a vacuum appliances, such as a dry air vacuum cleaner, a wet/dry vacuum cleaner, a water extractor (e.g., carpet cleaner), etc. The generally atmospheric air pressure on a motor side of the seal and a vacuum on an opposite turbine side of the seal urges the seal in an axial direction toward an impeller of the vacuum appliance and presses the seal firmly against an axially abutting sealing surface. Sliding sealing contact between a broad axial surface of the seal and the abutting sealing surface helps prolong the life of the seal and the bearing.
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