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1. Working principle of vortex flowmeter
The working principle of vortex flowmeter is based on the alternating arrangement of vortices generated by fluid passing through vortex generators, and the flow rate is calculated by detecting the vortex frequency. 1. Core working principle: When the fluid flows into the flowmeter, it first passes through a set of spiral guide vanes and is forced to rotate to form a vortex. After entering the expansion section, this vortex generates a spiral motion, and its center moves around the central axis of the instrument like a spiral line. The vortex frequency is proportional to the flow velocity, and the flow rate can be calculated by detecting the vortex frequency through a piezoelectric sensor. 2. Key component functions: Vortex generator: a specially designed spiral blade structure that forces the fluid to rotate. Sensor: usually piezoelectric, detects pressure fluctuations caused by vortex frequency. Signal processor: converts the frequency signal into a standard current signal (4-20mA) or digital signal. 3. Technical features: Measurement accuracy: ± 1.0% to ± 1.5% (liquid), ± 1.0% to ± 2.0% (gas). Range ratio: usually up to 10:1 or 15:1. Working temperature: -40 ℃ to+300 ℃ (depending on the sensor type). Pressure rating: up to 25MPa. Application precautions: Installation required. Ensure that the length of the front straight pipe section is ≥ 5DN and the length of the rear straight pipe section is ≥ 3DN (DN is the pipe diameter). Not suitable for low flow velocity measurement, the minimum flow rate needs to maintain the Reynolds number within a specific range. Media containing solid particles or fibers may block vortex generators and require the installation of filters. <
2. Uncertainty of Spiral Vortex Flow Meter
The uncertainty of Spiral Vortex Flow Meter should be analyzed separately according to its classification (Class A/B), and the core influencing factors include measurement repeatability, standard device error, etc. 1. Uncertainty analysis methods for two types of vortex flowmeters: Type A flowmeter: using the instrument K coefficient to calculate the indication error, uncertainty analysis focuses on the stability of the K coefficient and the repeatability of the flow point measurement. ② B-class flowmeter: cumulative flow is used to calculate indication error, and uncertainty needs to be introduced as variables, including measurement error and pulse counting stability.
2. The main influencing factors of uncertainty need to be considered for all types of vortex flowmeters: • Flow meter repeatability: the degree of dispersion of continuous measurement data • Standard device error: such as the accuracy level of gas flow accompanying the standard device • Medium state fluctuation: density deviation caused by temperature and pressure changes. 3 In practical applications, it is recommended to prioritize using the real flow calibration method to obtain the correction parameters for specific models when the measurement accuracy requirement is higher than level 1.0. If theoretical estimation is required, component synthesis calculation can be carried out based on the mathematical model in JJG 1121-2015 "Verification Regulations for Spiral Vortex Flowmeters".
3. What are the types of flow meters?
Volumetric type: waist wheel, elliptical gear, modified Zen plug type, scraper, etc. Speed type: electromagnetic, ultrasonic, turbine, vortex jet, rotary vorte
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