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Balanced flowmeter greatly improves the traditional throttling device
2012-3-10 8:26:35

是第三代节流装置,是美国国家航空航天局(NASA)下属马歇尔航空飞行中心(NASA-MSFC)针对航天飞机的主发动机液氧测量而设计发明的一种新型流量计,称为平衡流量计。 The balance flow meter is a third-generation throttling device. It is a new type of flow meter designed and invented by the Marshall Aviation Flight Center (NASA-MSFC) of the National Aeronautics and Space Administration (NASA) for the measurement of liquid oxygen in the main engine of the space shuttle. Is a balanced flow meter. The measurement accuracy of this flow meter is 5 to 10 times that of traditional throttling devices, the flow noise is reduced to 1/15, the permanent pressure loss is about 1/3, and the pressure recovery is 2 times faster. The minimum straight pipe section can be less than 0.5D. The movable parts are very convenient and simple to install and use, which can save large straight pipe sections and greatly reduce the energy consumption required for fluid operation. It is an energy-saving instrument with broad application prospects.
The balanced flow meter has greatly improved the traditional throttling device, and changed the principle of throttling from edge throttling to balanced throttling. It is a revolutionary differential pressure flow meter. The balanced flow sensor is a porous disc throttle rectifier, which is installed on the cross section of the pipeline. The size and distribution of each hole are customized based on unique formulas and test data, called function holes. When the fluid passes through the function holes of the disc, the fluid will be balanced and adjusted, and the vortex will be minimized to form an approximately ideal fluid. Through the conventional pressure taking device, a stable differential pressure signal can be obtained, and the volume flow rate is calculated according to Bernoulli's equation. ,Mass Flow.
The ingenious design of the balanced flow meter is to combine the porous rectifier and the measurement orifice plate into one, which can adjust the flow field balance to the ideal state to the maximum extent, so as to exert the advantages of the differential pressure flow meter to the extreme. Supported by huge space research funding, from 2000 to 2004, NASA and QMC have organized a large number of flow technical experts, invested 10 million US dollars, conducted a large number of tests on balanced flow meters, and about 100,000 sets of flow measurement data reflected the test. The results are good and the product performance is comforting. The balanced flow meter is suitable for almost all fluid measurement. It is a revolution in fluid measurement technology. Its processing, manufacturing and installation can be standardized like orifice plates. Verification is also easy to achieve dry standard. It is expected to become a new international standard for throttling devices. NASA has won a series of patents for product inventions in 2004 and the invention award from the President in 2006.
The traditional throttling device has only one flow aperture, and the fluid loses its ideal state after throttling. The balanced flowmeter has multiple function apertures, which can balance the flow field into an ideal fluid to the maximum extent, thereby reducing the pressure of the differential pressure flowmeter. Give full play to the advantages. The balanced flow meter is suitable for almost all fluid measurement. It is a revolution in fluid measurement technology. At present, the balanced flow meter has been widely used in petroleum, chemical, metallurgy, power, natural gas, water treatment and other industries.

是一种革命性的差压式流量仪表,其工作原理与其他差压式流量计一样,都是基于密封管道中的能量转换原理:在理想流体的情况下管道中的流量与差压的平方根成正比;用测出差压值根据伯努利方程即可计算出管道中的流量。 Product Principle Balanced flow meter is a revolutionary differential pressure flow meter. Its working principle is the same as other differential pressure flow meters. It is based on the principle of energy conversion in a sealed pipeline: the flow in the pipeline under the condition of an ideal fluid. It is proportional to the square root of the differential pressure; the flow in the pipeline can be calculated by measuring the differential pressure according to Bernoulli's equation. The balanced flow sensor is a porous disc throttle rectifier, which is installed on the cross section of the pipeline. The size and distribution of each hole are customized based on special formulas and test data, called function holes. When the fluid passes through the function holes of the disc, the fluid will be balanced and rectified, and the vortex will be minimized to form an approximately ideal fluid. A stable differential pressure signal can be obtained through the pressure taking device. Mass Flow.

Characteristics of balanced flowmeter
1. Measurement accuracy is 5-10 times that of standard orifice plate

2. Flow noise is 1/15 of standard orifice plate

3.The permanent pressure loss is 1/3 of the standard orifice plate

4.Pressure recovery is 2 times faster than standard orifice plate

5.The minimum straight pipe section can be less than 0.5D

First, high linearity and good repeatability

传感器具有对称多孔结构特点,能对流场进行平衡,降低了涡流、振动和信号噪声,流场稳定性大大提高,使线性度比孔板提升了5~10倍,重复性提高了54%,为0.15%,从其综合性能来看,平衡流量计属于高档流量计行列。 The balanced flowmeter sensor has the characteristics of symmetrical porous structure, which can balance the flow field, reduce eddy current, vibration and signal noise, greatly improve the stability of the flow field, make the linearity 5 to 10 times higher than the orifice plate, and improve the repeatability. 54% is 0.15%. From its comprehensive performance, balanced flowmeters belong to the ranks of high-end flowmeters.
5: 1 range ratio, linearity can reach ± 0.3%;
7: 1 range ratio, linearity can reach ± 0.5%;
10: 1 range ratio, linearity can reach ± 1.0%

2. Low requirements for straight pipe sections

The balanced flow sensor has a stable flow field, and the pressure recovery is twice as fast as the orifice plate, which greatly shortens the requirements for straight pipe sections. The straight pipe sections before and after are generally 3D before 1D, and the minimum can be less than 0.5D, thereby eliminating a large number of straight pipe sections. , Especially pipes of particularly expensive materials.

Third, reduce permanent pressure loss

The porous symmetrical balance design reduces the formation of turbulent shear forces and vortices, and reduces the loss of kinetic energy. Under the same measurement conditions, it reduces the permanent pressure loss by 2.5 times compared with the orifice plate, thereby saving considerable The large operating energy cost is an energy-saving instrument, which is worthy of extensive promotion.

Fourth, dirt resistance is not easy to block

The porous and symmetrical balance design reduces the turbulent shear force and the formation of eddy currents, thereby greatly reducing the formation of stagnant dead zones, ensuring that the dirty medium smoothly passes through multiple holes, and reducing the chance of fluid holes being blocked.

Five, can directly replace the orifice plate

It has the same use method and appearance as the orifice plate, so it can be replaced directly without any changes in piping and related instruments. It is very suitable for changing the orifice plate to a balanced flow meter in the whole plant energy measurement transformation.

Wide flow measurement range

According to the test results, we learned that: the performance of the flow meter is balanced so that the flow rate can be from the minimum to the speed of sound; its minimum Reynolds number can be less than 200, the maximum Reynolds number is greater than 107; and the beta value can be selected from 0.25 to 0.90.

Good long-term stability

Because its turbulent shear force is significantly reduced, the direct friction between the medium and the throttle is greatly reduced. Its β value remains unchanged for a long time. The entire instrument has no moving parts, so it can maintain stability for a long time.

Eight, can measure high temperature and high pressure medium

As with orifices and other throttling devices, the working temperature and pressure depend on the materials and grades of the pipes and flanges. The working temperature can reach 850 ° C and the working pressure can reach 42MPa.

Nine, measurable medium of complex working conditions

Due to its special structural design, it has special properties, it can perform gas-liquid two-phase, various mixed gases (such as gas, biogas, coal gas, etc.), and various low-temperature gases (such as LNG, liquid nitrogen, liquid oxygen) , Liquid argon, liquid hydrogen, liquid chlorine, liquefied ethylene, liquefied petroleum gas, etc.), gas-liquid two-phase media (such as moisture), slurry, multiphase water flow, vibrating water flow, electromagnetic interference media and bidirectional flow (because of equilibrium The flow meter is completely symmetrical from left to right).