| 摘要 |
What is described is 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), for supplying a flow of air to the intake section, a second tubular duct (16), coaxial with the first duct (15), for supplying a flow of gas at the end of the converging portion (15a) which has the smallest cross section, in such a way that the flow of air is mixed with the flow of gas upstream of the fan intake section (9), 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), these leading edges forming the mouths of corresponding blade channels between adjacent pairs of blades, extending between the intake section (9) and the delivery section (10) of the fan, 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 at least 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), the at least one appendage extending in an area delimited jointly by the terminal portion of the first converging duct (15), by the extension of this portion (15a) towards the base surface (12) of the impeller on the side of the impeller base surface (12) nearer to the leading edges (13) of the blades, by said leading edges (13) of the blades, and by the front surface profile (14) of the fan housing manifold (11) which is positioned in front of the blades (8) of the impeller in the proximity of the corresponding leading edges (13) of the blades. |
