| 摘要 |
The subject of this invention is the hybrid ventilating cap meant especially for establishing and stabilizing on a required level the amount of airflow in the ventilating ducts, of which the upper cover (2) with the dome (3) on its top create the upper element (1) of housing of which the cross-section forms an asymmetric, aerodynamic profile, while the upper cover (2) has got a circular-symmetrical overpress in the space of which a, bottom plug (5) is situated having the shape of a truncated cone and provided with the blades (10), whereas the profiled lower cover (4) having in its axle an inlet with the diameter d makes the aerodynamically profiled lower element of the housing of the cap (4) being the basis of the cap, while both aerodynamically profiled elements: upper element (2) and lower element (4) of the housing thanks to their shape and their interacting arrangement, form the aerodynamically shaped housing of the hybrid cap, in which the distance between the surface having the outer edges of the blades (8) and the upper surface of their lower cover (4) H does not exceed 0,3 d, whereas the upper cover (3) has got a profiled socket for fixing the electrical driving engine (7) on which either on the whirling stator, or on the pivot of the rotating shaft - the bottom plug (5) having radial blades and with circular-symmetrical outer edge (9), bent archwise to the middle is located with the outer diameter D larger than 1,6 d and which straight, radially arranged blades (10) have the length L=[ (0,8 - 1,0) x (D-ds)]/2, where: D- means an outer diameter of the bottom plug (5) and ds - means a diameter of the housing of driving engine (7), while the distance between the surface having the outher edges of the blades and the frontal surface of the bottom plug is within h=(0,01-0,03) x d, and the maximal width of the blades (10) in their best of all efficiency of volume of the device is within bmax = (0,15-0,3) x D. |
