| 摘要 |
<p>A suction power unit for a wet vacuum machine includes a dome-shaped housing closed off by a bottom wall with an inlet defined in the bottom wall and a centrifugal blower aligned with the inlet. A second wall is parallel to the bottom wall and spaced therefrom defining an exhaust chamber about the centrifugal blower and hermetically separating the motor on the centrifugal blower from the exhaust chamber. An inlet opening in the second wall and a third wall spaced from the second wall and parallel thereto define a chamber, and a second centrifugal blower is provided in the so-formed chamber between the second and third walls with the motor beyond the third wall hermetically sealed from the chamber formed between the second and third walls. Exhaust ports communicate the chamber with the atmosphere such that an unimpeded flow is provided from the inlet and the bottom wall through the first centrifugal blower through the inlet in the second wall through the second centrifugal blower through the exit exhaust ports, and the air flow is completely isolated from the motors of the two centrifugal blowers.</p> |
