| 摘要 |
Apparatus for measuring the flow rate of liquid or gaseous media, having a device for producing an effective or dynamic pressure which can be inserted into the line for the media flow and having a displacement sensor with a final control element which can be displaced by the effective or dynamic pressure against the force of a spring. In this arrangment, the spring is designed as a leaf spring or bar spring with a linear characteristic, which spring rests freely on two points and forms the opposing force to the spring load caused by the effective or dynamic pressure. The final control element, which exerts the spring load, engages on the spring preferably in the centre between the resting points. In the bending plane of the spring there is arranged a curved track, on which with punctiform loading the spring is supported at the points of contact tangentially with respect to its respective bending line. In this arrangement, the free bending length determining the bending rigidity changes with the flexing of the spring in such a way that a spring flexing which is quadratically proportional to the spring load or the effective or dynamic pressure is obtained. The adjustment of the final control element from the zero position in the displacement sensor consequently produces a measured variable which is linearly proportional to the flow rate.
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