的基本原理和标准孔板基本相同，但结构相差甚远。 The basic principle of BYM-HX annular orifice plate flow meter is basically the same as that of standard orifice plate, but the structure is very different. The annular orifice plate itself has a measuring tube. A coaxial circular plate is fixed in the middle of the measuring tube. The circular plate is fixed on the pipe by a support frame. It is suitable for the measurement of various fluid media (gas, steam, liquid), such as saturation. Steam, superheated steam, compressed air, various gas, exhaust gas, cooling water, heavy oil, residue oil, fuel oil, condensate, various chemical solutions, etc. The annular orifice plate has the characteristics of simple, strong structure and convenient installation and use of standard orifice plates. At the same time, it does not need long straight pipes, and has the advantage of working under harsh pipeline conditions.
依据的基本原理同标准孔板一样，适用于流体连续性方程和伯努力方程，所不同的是流体进入测量管段后，最小流通截面不一样，标准孔板最小流通截面是圆形，环形孔板最小流通截面是环形，把环形流通面等效成圆形流通截面，等效孔径为d，等效孔径比β=d/D,基本方程是： The basic principle of the annular orifice plate flowmeter is the same as that of the standard orifice plate, which is applicable to the fluid continuity equation and the Boer equation. The difference is that after the fluid enters the measuring pipe section, the minimum flow cross section is different. The minimum flow cross section of the standard orifice plate is round. Shape, the minimum flow cross section of the annular orifice plate is circular, the circular flow surface is equivalent to a circular flow cross section, the equivalent aperture is d, and the equivalent aperture ratio β = d / D. The basic equation is:
Qm = 0.12643
Qm: fluid flow through the measuring tube (㎏ / h)
ε: the coefficient of expansion of the beam, for incompressible fluids ε = 1
D: inner diameter of measuring tube (mm)
C: outflow coefficient
ρ: the density of the fluid under working conditions (㎏ / m3)
ΔP: pressure difference (kPa)
1. Suitable for measuring dirty media such as steam, gas and cooling water.
The special structure of the annular orifice plate flowmeter with “peripheral circulation and middle blocking” allows the impurities to flow freely and the condensed water formed by the steam when the steam is stopped to flow away, thereby improving the working reliability and measurement accuracy.
2. Suitable for flow measurement of high temperature and high pressure fluid.
测量高温流体时，测流板周边呈自由状态，温度膨胀仅改变外形尺寸，不改变边缘尖锐度和形状，因此不改变流出系数，不影响测量精度；测量高压流体时，因测流板在管道内部，与静压力的高低无关，降低加工成本。 When the annular orifice plate flowmeter measures high temperature fluid, the periphery of the flow plate is in a free state. The temperature expansion only changes the external dimensions, does not change the edge sharpness and shape, so it does not change the outflow coefficient and does not affect the measurement accuracy. The current measuring plate is inside the pipeline, which has nothing to do with the level of static pressure, which reduces the processing cost. 3. It is more reliable and accurate to measure than round missing plate and eccentric orifice plate. 4. The pressure equalizing ring structure is adopted to reduce the source of measurement error. 5. The differential pressure transmitter with remote transmission diaphragm box can be used to measure the flow of dirty media such as residue oil and heavy oil.
Scope of application
1. Nominal diameter: 50mm ≤ DN ≤ 1800mm 2. Reynolds number range: 103 ≤ ReD ≤ 107 3. Nominal pressure: PN ≤ 32MPa 4. Working temperature: -196 ～ 530 ℃ 5. Accuracy: Class 1 and Class 1.5