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(接上期)(三)容积式流量计容积式流量计又称为定排量流量计,一般包括腰轮流量计、刮板流量计、双转子流量计、椭圆齿轮流量计、旋转活塞流量计和膜式燃气表等。1.腰轮流量计(1)原理腰轮流量计内部有一个具有一定容积的计量“斗”空间,该空间一般是由流量计内的运动部件和其外壳构成的,不同的“斗”空间类型就形成了不同的腰轮流量计。当流体流过流量计时,流量计的进口和出口之间产生一个压力差(压力损失),在这个压力差的作用下,使流量计内的运动部件不断运动,将流体一次次充满计量“斗”空间并从进口送到出口。预先求出其空间的体积,测量出运动部件的运动次数,从而求
(Continued) (C) Volumetric flowmeter Volumetric flowmeter, also known as constant displacement flowmeter, generally including the waist wheel flowmeter, scraper flowmeter, dual rotor flowmeter, oval gear flowmeter, rotary piston flowmeter And membrane gas meters. 1. Roots flowmeter (1) Principle Roots flowmeter has a certain volume inside the measurement “bucket ” space, the space is generally composed of the movement of the flowmeter components and their enclosures, different Bucket “space type formed a different waist wheel flowmeter. When the fluid flows through the flow meter, there is a pressure difference (pressure loss) between the inlet and the outlet of the flow meter. Under the action of this pressure difference, the moving parts in the flow meter continuously move to fill the fluid again and again. Bucket ”space and sent from the entrance to the exit. Pre-calculated volume of space, measuring the number of movements of moving parts, thus seeking