| 摘要 |
A hinged vertical exhaust pipe is provided to allow easy adjustment of the height of the exhaust pipe. The upper and lower sections of the exhaust pipe are hinged together by a stiff joint, e.g., a spring-loaded hinged friction joint, and are positioned in line with one another with a slight gap between them. The lower section is double walled, and the inner wall extends somewhat up into the upper section. The upper section is single walled, with its wall aligned with the outer wall of the lower section. Air is drawn into the space between the inner and outer walls at the base of the lower section and also at a gap at the joint between the upper and lower sections. This air is drawn in both due to the aspiration caused by the higher speed exhaust flow through the inner exhaust pipe, and due to thermal rising of heated air. The space between the inner wall of the lower section and the wall of the upper section acts as a venturi, directing the air in a uniform fashion up into the upper section of the exhaust pipe. This cools the pipe and minimizes blow back at the joint between the upper and lower sections of the pipe.
|
