| 摘要 |
A diffuser (200) for a plasma cutting torch comprises a substantially annular main body (201) with a main axis (X), an annular lower wall (204), an annular upper wall (205) and a cylindrical outer lateral wall (206) and at least one channel (207) for the passage of gas; the channel (207) having an inlet (207a) located on the outer lateral surface (206) and an outlet (207b) positioned at the annular lower wall (204) and an axis (A) of extension which is slanting relative to the main axis (X) ; the projection of the axis (A) of the channel (207) in a plane "at" forming, with the axis (a), an angle (Õ) in a Cartesian reference system whose centre lies at (O), with an axis (a) parallel with the main axis (X), an axis (r) in a radial direction and an axis (t) perpendicular to the axes (a) and (r); the angle (Õ) is sized so as to impart to the velocity versor of the gas exiting the channel (207) an axial component "Vass" and a tangential component "Vtan" in such a way that the ratio between the axial component "Vass" and the tangential component "Vtan" is between 0.27 and 0.70, that is to say: 0.27 ‰¤ Vass V tan ‰¤ 0.70. |
