| 摘要 |
The lamella (10) has two joint parts (12, 14) at lamella ends, where one of the parts has a spiral like element (40) and an end (42) of the element is connected with an angular point (44) at a curvature of the element. A wall (32) comprises characteristics such that the wall is connected with another wall (30) in a region of the one of the part at a connecting point (34). A wall section (38) with a constant thickness is provided between the connecting point and the lamella ends, where width has a value that is more than 1.3 times of width (f) of the element, and lamella is made of aluminum. |
