| 摘要 |
<p>A closure device for shelters and the like. The frame (1) of the closure device is provided with at least one flow-through passage (2); a closure (3) is mounted displaceably in each passage; and a counter part is formed in the frame for each closure. The closure is displaceable between an open position, which permits a normal air flow, and a closed position, which may be caused by a pressure shock, in which the closure means is pressed against the counter part so as to close the respective passage. The objective is to provide a simple and steady structure, the operation of which is as efficient as possible. Accordingly, the passage (2) is defined by substantially U-shaped elements/partial elements (5a, 5b) which open towards each other in the direction of flow. The element/partial element (5a and 5b respectively) on the incoming side of a flow (A or B) is arranged to function as a flow guide element, and the element/partial element (5b and 5a, respectively) on the exhaust side of the flow (A or B) is arranged to function as a suppressing element for the pressure shock.</p> |
