All fast canal flowmeter (abroad weighs Annbar, Torbar, Probar, Verabar, Itabar... etc) , come out already 38 years, the name is different, sectional each different, but it is to be based on pitot tube to measure fast principle, a few velocity of flow goes up in order to measure to come to a kind of computative discharge insert type flow meter point-blank in conduit. It has a structure simple, the price is low, outfit, tear open convenient, control damage small. From bad news material little, moving fare is low a kind of energy-saving appearance is in light of 2 respects. In advocate construction energetically currently managing model below economic condition, it is a kind of flow meter that is worth to recommend.

One, fundamental (graph one)

Discharge Q is unit time conduit some is passed inside S the fluid bulk M of sectional A³(or quality Kg) , namely Q= M³/ S=m²·M/s=A · V

Discharge also convertibility is conduit the product of sectional A and V of velocity of flow, but the velocity of flow in industrial conduit is not invariable normally, fu is only sectional delimit for a lot of unit area Ai, multiply the Vi of velocity of flow with passing Ai, namely discharge Q= . But this kind of method is too trival. Fortunately no matter the velocity of flow in conduit velocity of flow distributings how complex, in longer straight canal paragraph (should be 30 times diameter commonly) hind, below the agglutinant action of the fluid, the velocity of flow inside the canal distributings to expand those who present heart of symmetrical Yu Yuan adequately turbulent flow. In this kind of circumstance, need to measure the N on diametical direction only the velocity of flow of the dot, with respect to well and truly computative discharge value.
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