的五大优势一、量程比宽、由于锥体能使流体流场均匀化，因此比一般差压流量计可测流速低，即量程下限比一般差压流量计低，所以量程可向下扩展，量程比可为15:1，雷诺数低至8000仍可保持信号的线形。 Five advantages of V-cone flowmeter : 1. Wide range ratio. Because the cone can make the fluid flow field uniform, the measurable flow rate is lower than that of ordinary differential pressure flowmeters. Downward expansion, the range ratio can be 15: 1, and the Reynolds number as low as 8000 can still maintain the linearity of the signal.
Second, the life is long, the fluid flows through the cone without sudden fluctuations, but instead becomes a boundary layer along the cone, and guides the fluid away from the rear corner of the cone, which makes the angle of the cone free from the abrasion of unclean fluid The flow coefficient β rate can be unchanged for a long time and ensure long-term accurate measurement. Therefore, the flow meter can be used for a long time in dirty places without regular maintenance and periodic verification (of course, regular maintenance and verification of the secondary meter is still necessary) . Small pressure loss The permanent pressure loss is lower than that of the orifice plate flowmeter and close to Venturi.
Third, the signal is stable. When the differential pressure generated by the throttling element also causes the eddy current behind the element, each type of differential pressure instrument has a signal fluctuation, even if the fluid is stable. For the standard orifice plate, the long eddy currents caused large signal fluctuations at low frequencies, which seriously interfered with the accuracy of differential pressure readings, while the eddy currents generated after the V-cone were very short, so the signal fluctuations were low-frequency. Amplitude, which makes the V-cone produce a stable signal.
独特的几何形状允许有广泛的β值范围，标准的β值为0.45，0.55，0.65，0.75，0.85，并可特定β值以保证用户特定的差压输出。 Wide range of β value. The unique geometry of the V-cone flowmeter allows a wide range of β value. The standard β value is 0.45, 0.55, 0.65, 0.75, 0.85, and the specific β value can ensure the user-specific differential pressure. Output. The V-cone completely purged design without retention zone avoids the retention of residue, condensate or particles in the fluid.
Fifthly, it can be widely used to measure the dirty medium without causing damage to the cone. Can measure vapor-liquid two-phase flow (liquid phase does not exceed 5%) and guarantee accuracy.
AKTVD type differential pressure type V cone flowmeter is a new type of high precision differential pressure type flowmeter. A special streamlined cone is suspended from the centerline of the closed pipe for central throttling, and the differential pressure measured by the upstream pipe wall and the tail of the cone is used to calculate the flow rate, hence the name V-cone flowmeter. Due to the unique structure design of the differential pressure type V-cone flowmeter, its performance is better than other differential pressure type flowmeters.
Like other differential pressure flowmeters, the AKTVD type differential pressure flowmeter is based on Bernoulli's law for energy conversion in closed pipes. That is, under a stable flow field, the flow rate of the medium and the differential pressure are measured. The square root is proportional. When the medium flows through the cone tip at a certain speed, due to the throttling effect of the cone, a low-pressure region P2 will be immediately formed downstream of the cone. There is a pressure difference △ P between the high pressure P1 upstream of the cone and the low pressure P2 downstream. The pressure difference △ P is sent to the differential pressure transmitter through the pressure taking port, and the change of the flow rate can be measured according to the change of the differential pressure.
Composition of flow measurement system
由内置锥体节流件与三阀组、散热件、引压管、差压变送器、流量计算机组成流量测量系统。 AKTVD differential pressure type V-cone flowmeter is a flow measurement system consisting of a built-in cone throttling part and three valve groups, a heat sink, an impulse tube, a differential pressure transmitter, and a flow computer. For media such as gas and steam, temperature and pressure compensation can be added to form a mass flow and standard volume measurement system. AKTVD type V-cone flow metering: precise pipeline type (DNl5 ～ DN900 or larger); wafer type (DNl5 ～ DNl50)