浮子流量計（轉子流量計） 金屬管浮子流量計實際是一種可變面積式流量計。它通常具有一段直立的錐管和一只可以在其中自由地隨流量大小上下移動的浮子。當流體自下而上流經錐管時，流體的動能在浮子上產生的推力 S 和流體的浮力 A 使浮子上升。隨著錐管內壁與浮子之間的環形流通面積增大，流體動能在浮子上產生的推力 S 隨之下降。當推力 S 與浮力之和等于浮子自身重力 G 時，浮子處于平衡狀態，并穩定在某一高度
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