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水表是如何工作的

瀏覽次數: 日期:2012-9-29

  由于水表有多種測量原理,種類繁多,這里僅以生活中最常見和使用量最大的旋翼式水表為例加以說明。旋翼式水表屬于速度式水表的一種。速度式水表的定義為:安裝在封閉管道中,由一個動一力元一件組成,并由水流速直接使其獲得運動的一種水表。
  這里所說的動力元件,對于旋翼式水表來一說指的就是葉輪。當水流通過水表時,驅動葉輪旋轉,而水流的流速與葉輪的轉速成正比,同時因為水流驅動葉輪處噴口的截面積是一個固定值,因此葉輪的轉速與流量也成正比。葉輪通過葉輪軸上的一聯動部件與計數機構相連接,計數機構可以累積葉輪的轉數,從而記錄下通過水表的水量。

所屬類別: 儀表常識

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