对传统节流装置进行了极大的改进，具有平衡整流的显著特征。 The balanced flowmeter has greatly improved the traditional throttling device, and has the remarkable characteristics of balanced rectification. 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.
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. Straight pipe section requires a low-balance flow sensor. Because the flow field is stable and the pressure recovery is twice as fast as the orifice plate, the requirements for the straight pipe section are generally shorter. This eliminates the need for a large number of straight pipe sections, especially pipes of particularly expensive materials.
Third, reduce the permanent pressure loss. The porous symmetrical balance design reduces the turbulent shear force and vortex formation, reduces the loss of kinetic energy. Under the same measurement conditions, it reduces the permanent pressure by 2.5 times compared with the orifice plate. The loss, which saves considerable operating energy costs, is an energy-saving instrument that deserves a lot of promotion.
Fourth, the anti-fouling balance design is not easy to block the porous symmetry, which 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, reducing the fluid holes Chance of being blocked.
5. Orifice plate can be replaced directly. It has the same use method and appearance as the orifice plate, so it can be replaced directly. It does not require any changes in piping and related instruments. It is very suitable to change the orifice plate to the whole plant energy measurement transformation. Balance the flow meter.
6. Wide flow measurement range According to the test results, we learned that: the performance of the flowmeter is balanced so that its flow rate can be from the minimum to the speed of sound; its minimum Reynolds number can be less than 200, and its maximum Reynolds number is greater than 107; the beta value can be selected from 0.25 to 0.90.
Good long-term stability. Due to the obvious reduction of the turbulent shear force, 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 be maintained for a long time. stability.
8. The measurable high-temperature and high-pressure medium is the same as throttling devices such as orifice plates. 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.
左右完全对称)。 Nine, the measurable complex working medium has special properties due to its special structural design, it can perform gas-liquid two-phase, various mixed gases (such as gas, biogas, coal gas, etc.), 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, vibration water flow, electromagnetic Interfering medium and bidirectional flow (because the balanced flow meter is completely symmetrical from left to right).