| 摘要 |
<p>The draught regulator is for a gas-discharge passage such as a chimney, ventilator etc. having coaxial deflectors at a set distance apart one above the other, sloping outwards and ring-shaped. Fixing devices underneath secure them above the passage. Between two successive deflectors (1,3) there is a cylindrical shield (4) coaxial to them, and whose height is less than the distance between them, so that a passage is formed above and below it. One or more of the deflectors can have the edge bent over, to give a spoiler effect. FL.</p> |
