| 摘要 |
In an electric motor fan unit for environments such as washing machines, vacuum cleaners, air samplers, a motor section frame enclosing an internal motor cooling air path includes an end bracket with an enlarged rim for mounting fan shell and interior partition structures defining a fan section housing for a smaller motor ventilating impeller and a larger working air centrifugal impeller commonly mounted on the motor shaft outboard of the motor section frame and drawing respective air streams into housing axial inlets for discharge at the housing circumference. Back-to-back and axially spaced impeller dispositions and corresponding housing structures and also resultant direction of ventilating air from the motor to the air discharge region ensure both adequate motor and adjacent bearing ventilation and bearing protection from working air borne moisture, contaminants, and high temperature and humidity, by simple, low cost, durable structure.
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