| 摘要 |
Meter for measuring the flow rate of aeriform substances (1), comprising A) a meter body (3) in which a measuring duct (5) is obtained; B) a fan (7) housed in the measuring duct (5), arranged for rotating on itself about a predetermined rotational axis (AR) longitudinal to the measuring duct (5); C) an elastic element (9). The meter (1) is arranged so that the flow of a fluid that flows in the measuring duct (5) applies to the fan (7) an overall driving torque tending to rotate the fan (7) about the predetermined rotational axis (AR) stressing and deforming the elastic element (9), and the latter, by deforming, counteracts such a rotation or tendency to rotate. The mobile index (13) is positioned along the graduated scale (17) in equilibrium between elastic force and aerodynamic force; the body (3) is transparent so as to allow the movements of the mobile index (13) to be seen from outside. |
