| 摘要 |
<p>The utility model provides a ventilation opening for a tube. Airflow is guided to a gap between a cover on the upper portion and a barrel body on the lower portion in a concentrated mode through a guiding part, and the guiding part is improved. The ventilation opening for the tube is provided with an annular extending part for guiding, the upper cover, the barrel body on the lower portion and guiding plates, wherein the trapezoid-shaped-cross-section of the upper cover is provided with a slope face, with the narrow upper side and the wide lower side, formed from the extending part to the upper end face, the barrel body on the lower portion corresponds to the extending part for guiding and is connected from the extending part to a cylinder body in the mode of forming the slope face with the wide upper side and the narrow lower side, the guiding plates are arranged between the upper cover and the barrel body on the lower portion, the gap is reserved through the guiding plates, the guiding plates are connected and assembled through a bolt and a nut, the small-angle slanting airflow guiding part is formed by the guiding plates in a perpendicularly-formed flat plate face, and the airflow is guided to the gap between the upper cover and the barrel body on the lower portion.</p> |
