| 摘要 |
<p>A water bath vacuum cleaner (1) includes a water bath housing (2) and a fan enclosure (15) separated by wall (4). A fan assembly (7) is mounted within a fan housing (6) and is driven by a motor (9) to draw air from the water bath housing (2) through a separator (12). A small radial clearance (40) is provided between the rotating parts of a fan and separator assembly and the stationary parts of the fan housing (6). In order to prevent the passage of water droplets through the small radial clearance (40) the fan comprises at least two fan stages and is arranged such that the absolute air pressure within the fan housing (6) adjacent the small radial clearance (40) is higher than the absolute air pressure within the water bath housing (2). Accordingly, in use a small leakage of air occurs from the fan assembly back into the water bath housing, thereby preventing the passage of liquid droplets in the opposite direction.</p> |
