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Industry Information
V-cone flowmeter can make the correct differential pressure between the fluid and the highest flow velocity in the center of the pipeline
2012-4-11 9:23:23

又称内锥流量计、V锥、锥形流量计,是一种具有专利技术的新型差压流量计,和其它类型的差压流量计的基本原理相同,都是基于密封管道中的能量守恒原理,V锥流量计的独特设计,扩大了流量测量范围,并避免了传统差压流量计的一些局限性,工作性能更优。 V cone flowmeter, also known as inner cone flowmeter, V cone, and cone flowmeter, is a new type of differential pressure flowmeter with patented technology. It has the same basic principle as other types of differential pressure flowmeters and is based on sealed pipes. The principle of energy conservation, the unique design of the V-cone flowmeter, expands the flow measurement range, and avoids some of the limitations of traditional differential pressure flowmeters, and has better working performance. The V-cone flowmeter is a cone-shaped interceptor suspended in the center of the pipeline. The cone-shaped member obstructs the flow of the medium and reshapes the velocity curve. The measurement medium includes water, steam, air, natural gas, nitrogen, coke oven gas and organic gas. Media conditions can range from deep low temperatures to supercritical states. The maximum working temperature is 450 ° C, the maximum pressure is 25Mpa, the highest Reynolds number can be measured is 5 * 106, and the lowest Reynolds number is 8 * 103 or even lower. Generate full-scale differential pressure signals from a minimum of less than 0.1 kPa to a maximum of tens of kPa.

是一种差压流量仪表,迄今为止以差压原理设计的流量仪表已经有一百多年的应用历史了。 V cone flowmeter is a kind of differential pressure flow meter. So far, the flow meter designed based on the principle of differential pressure has more than 100 years of application history. The principle of differential pressure is based on the principle of energy conversion in a sealed pipe, which means that for a stable fluid, the flow rate is proportional to the square root of the velocity of the medium in the pipe. When the medium is close to the cone, its pressure is P1. When the medium passes through the interception area of the cone, the speed increases and the pressure decreases to P2. Both P1 and P2 are led to the differential pressure transmission through the pressure inlet of the cone flowmeter. On the device, when the flow rate changes, the differential pressure value between the two pressure taking ports of the cone flowmeter will increase or decrease.
在进行流量计算时所采用的计算公式同其他差压流量仪表相同,但其截流元件的独特设计,迫使管道中心的介质绕着锥体流动,与其他差压流量计相比这样有很多优点。 The calculation formula used by the V-cone flowmeter for flow calculation is the same as that of other differential pressure flow meters, but the unique design of the shut-off element forces the medium in the center of the pipe to flow around the cone, compared with other differential pressure flow meters. There are many advantages. We can understand the performance of the conical flowmeter with the help of the ideal flow velocity profile. The fluid in the pipeline is not subject to any disturbance and obstruction, which is what we call the ideal flow state. His velocity distribution is uniform, the velocity near the pipe wall is almost zero, the velocity at the center of the pipe reaches the maximum, and the velocity near the pipe wall is almost Zero is caused by the frictional force of the pipe wall on the medium. Because the cone is suspended in the center of the pipeline, he is in direct contact with the high-speed region of the fluid, forcing the fluid in the high-speed region to mix with the fluid in the low-velocity region near the pipe wall to make the flow velocity uniform. So even if the flow rate is very low, the conical flow meter can still make the fluid and the highest flow rate in the center of the pipeline continuously produce the correct differential pressure. In reality, it is difficult to distribute the flow velocity uniformly, and any change in the pipeline may affect the fluid, such as: bay head, valve, reduced diameter, expanded diameter, pump, tee, etc. The upstream velocity distribution curve is reshaped, and the measurement accuracy can be guaranteed even under extremely severe conditions.