| 摘要 |
<p>The invention relates to an accessory which is intended to be mounted to the end of the outlet conduit (4) of a sudden air discharge device (1). The inventive accessory takes the form a tube which is mounted coaxially to the axis of the outlet conduit. The invention is characterised in that the cross-sectional area of the tube decreases in the direction (F) in which the air is discharged and, subsequently, increases, thereby forming a convergent segment (A) followed by a divergent segment (B).</p> |
