| 摘要 |
<p>The nozzle has a connection zone (21) formed by curved walls (11, 25), where radius of curvature of the curved walls is greater than 30 mm. A base plate (2) includes a brush (3) placed on its periphery, where the brush comprises a rectangular opening (36) uniformly placed on a lower edge (34) of a front face (31) of the brush. Dimension of the opening is determined based on a noise/rate compromise level of the nozzle. The base plate includes a frame (20) in which the brush is inserted, where center of the frame forms an inlet of a suction channel.</p> |
