| 摘要 |
<p>The switch (19) has a middle part (7) with front plates (8, 9) connected with a mantle, where the middle part is formed as a rotary part. A straight tube section (13) and a curved tube section (14) are tightly held at the front plates. The front plates are turned towards a curved support (5) and have an aperture (12) that is arranged in an area of a straight support (4) in an aligned condition of the curved tube section with the curved support, where the curved tube section has radial ventilation boreholes (17) arranged along a peripheral line.</p> |
