作为直观活动指示或丈量精确度要求不高的现场指示仪表，占平衡流量计应用的90％以上，被广泛地用在电力、石化、化工、冶金、医药等流程产业和污水处理等公用事业。 Balanced flowmeters are intuitive field indicators or field indicators with low measurement accuracy requirements, accounting for more than 90% of the application of balanced flowmeters. They are widely used in power industry, petrochemical, chemical, metallurgical, pharmaceutical and other process industries and sewage treatment. Utilities. Some application sites only need to monitor the flow rate not exceeding or not lower than a certain value. For example, the increase of the cable inert protective gas flow indicates that a new leak point has occurred. Circulating cooling and culture tank and other places such as water or air flow reduction and cut-off alarm can choose glass tube balance flowmeter with upper or lower flow alarm.
The main measurement object of a balanced flow meter is a single-phase liquid or gas. Particles in a liquid or droplets in a gas are usually not applicable. Due to the balance, the adhesion of particles or micro-bubbles in the liquid flow will affect the measurement value. For example, after a period of use, the micro-flow meter will balance the adhesion layer that cannot be seen by the naked eye. It will also change the flow rate display value by a few percent. First consider the inexpensive glass tube balance flowmeter. If the temperature and pressure are not sufficient, choose the local indicating balance flowmeter. Glass tube balanced flowmeters should be selected with a transparent protective cover. Once the glass cone tube breaks, it can stop the fluid from splashing forward for emergency treatment. When used for gas, a guide rod or a ribbed instrument should be used to avoid accidental balancing and crushing of the cone tube. If it is necessary to transmit the signal remotely for total accumulation or flow control, a balanced flowmeter with electrical signal output is generally selected. If the ambient atmosphere has explosion-proof requirements and there is an on-site gas source for control instruments, priority is given to remote gas transmission metal balance flow meters. If electric remote transmission instruments are selected, they must be explosion-proof. When measuring opaque liquids, it is more common to choose a balanced flowmeter, but a glass tube balanced flowmeter with a ribbed tapered tube can also be selected, and the position of the balance can be determined by balancing the maximum diameter of the contact with the ribs. Balance flow meter is a volume flow meter which is balanced to measure the volume flow in vertical conical tube as the flow rate changes and change the flow area between them. It is also called rotor flow meter. It is often called variable area flowmeter or area flowmeter in the United States and Japan. 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. After throttling, the fluid loses its ideal state and the balanced flowmeter has multiple function apertures, which can balance the flow field into an ideal fluid to the maximum extent, thereby taking advantage of the differential pressure flowmeter. The full play. 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.
The symmetrical and balanced design of the balanced flow meter reduces the formation of eddy currents and turbulent friction, and reduces the loss of kinetic energy. Under the same operating conditions, compared with the traditional throttling device, the pressure loss is 70% less, which is close to the Venturi tube. This saves a considerable amount of operating costs and is worth a lot of promotion. Can be applied to the measurement of gas, liquid, gas-liquid two-phase, liquid gas, two-way flow, dirty media, slurry.
的技术要求： Technical requirements for balanced flowmeters :
1. Pipe diameter range: DN15 ~ DN3000
2. Accuracy: ± 0.3%, ± 0.5%, ± 1%
3. Straight pipe requirements: 0.5D ~ 2D
4. Permanent pressure loss: 1/3 ~ 1/4 of orifice plate
5. Range ratio: 10: 1, suitable working condition data can be wider 6. Repeatability: 0.1%
7. Re range: 200 ~ 107
8. β range: 0.25 ~ 0.9
9, temperature range: the temperature that the metal pipeline can withstand, up to 850 ℃
10, pressure range: the pressure that the metal pipeline can withstand, up to 42MPa
将多孔整流器和测量孔板合二为一，最大限度地将流场平衡调整成理想状态，从而将差压式流量计的优势发挥出来。 11. Dirt resistance: special design and calculation. 12. It can measure bidirectional flow balance flowmeter. Combining the porous rectifier and measuring orifice plate into one to maximize the balance of the flow field to the ideal state, thereby the differential pressure flow. The advantages of design come into play. Balanced flowmeter is suitable for almost all fluid measurement. 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. Balanced flowmeter is a revolutionary difference Pressure flow meters, like other differential pressure flow meters, are based on the principle of energy conversion in sealed pipelines: in the case of an ideal fluid, the flow in the pipeline is proportional to the square root of the differential pressure; the differential pressure is measured using The value can be used to calculate the flow in the pipe based on 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. Through the pressure taking device, a stable differential pressure signal can be obtained. The volume flow rate is calculated according to Bernoulli's equation, Mass Flow