| 摘要 |
FIELD: civil defense structures such as hardened and blast ones. ^ SUBSTANCE: proposed device designed for installation in air intake and draft ducts of shielding structures has supporting frame with flange made in the form of supporting grid with spring-loaded blades hinged thereto at angle such as 45 deg, and frame holding them at this angle. Contours of spring-loaded blades are shaped so that when mating in closed position, they form labyrinth passages. Length of labyrinth passage amounts to 0.10 - 0.25 of blade width, that is L = (0.10 - 0.25) B, where L is labyrinth passage length; B is blade width. ^ EFFECT: reduced action of shock wave. ^ 2 cl, 3 dwg |
