| 摘要 |
<p>A street sweeper (10) is provided including a vacuum pick-up head (12) having a relatively low noise level and high sweeping efficiency resulting from the careful control of the velocity and direction of the air flow. In order to control the air flow, the internal contour of the pick-up head (12) is optimized to accommodate the streamline flow pattern to minize turbulence and boundary layer separation. The cross-sectional area of the internal contour of the pick-up head (12) is designed to be substantially constant or slightly converging. A support assembly (28) for supporting a nozzle assembly (30) is provided which minimizes damage to the pick-up head (12) and minimizes infiltration into the pick-up head (12). A suction tube (21) is also provided which minimizes the noise level and increases the efficiency of the pick-up head (12) and the fan (20).</p> |
