| 摘要 |
A mixer device for combustible gas burners, comprising a fan unit (6) with an impeller (7) having radial blades (8) driven about an axis (X) of rotation and with an axial intake section (9) and a radially opposed delivery section (10), a first duct (15) coaxial with the axis (X) of rotation, having a terminal portion (15a) converging in the proximity of the intake section (9), a second tubular duct (16), coaxial with the first duct (15), which has the smallest cross section, the blades (8) of the impeller projecting from a base surface (12) of the impeller, each blade (8) having a leading edge (13) located in the intake section (9), the fan housing manifold (11) having a front surface profile (14) positioned in front of the impeller blades (8) and spaced apart from them. The device also comprises one appendage (20) which projects from the first converging duct (15) in a direction away from said axis (X) and which is located outside the duct (15a), and is delimited jointly by the terminal portion of the first converging duct (15), by the extension of this portion (15a) towards the base surface (12), by said leading edges (13), and by the front surface profile (14). |
