1. The advantages of vortex flowmeters are compared with throttling differential pressure flowmeters. The advantages of vortex flowmeters are as follows.
1. The structure is simple, firm, easy to install and maintain. There is no need for pressure guiding pipe and three-valve group, etc., reducing leakage, blockage and freezing.
2. The accuracy is high, generally ±(1～1.5)%R.
3. Wide measuring range, vortex flowmeter with reasonable caliber, and the range can reach 20:1.
4. The pressure loss is small, about 1/4 to 1/2 of the throttling differential pressure flowmeter.
6. Output a pulse signal proportional to the flow rate, without zero drift.
7. Within a certain Reynolds number range, the output frequency of the orifice flowmeter is not affected by the physical properties (density, viscosity) and composition of the fluid, that is, the meter coefficient is only related to the shape and size of the vortex generator and the pipeline.
2. Disadvantages of vortex flowmeter
① It is more sensitive to the mechanical vibration of the pipeline, and it is not suitable for the magnetic flap level gauge in the strong vibration place.
②Large-caliber vortex flowmeter with low resolution. Generally, the flowmeter is used below DN700 when the tube is full.
③When the fluid temperature is too high, the sensor will have problems. Generally, the fluid temperature is less than or equal to 420°C.
④When the fluid has pressure pulsation or flow pulsation, the indication value is greatly higher and the influence is greater, so it is not suitable for pulsating flow.
Features of vortex flowmeter
1. The vortex flowmeter can measure the flow of dirty media, corrosive media and suspended liquid-solid two-phase flow. Since there are no parts obstructing the flow inside the measuring tube of the instrument, only the inner lining of the measuring tube and electronic components are in contact with the measured fluid, and the material can be selected according to the nature of the measured fluid. For example, using polytrifluoroethylene or polytetrafluoroethylene as the inner lining can measure various corrosive media such as acids, alkalis, salts, etc.; using wear-resistant rubber as the inner lining is particularly suitable for measuring wear and tear with solid particles Larger liquid-solid two-phase flow such as mineral pulp and cement slurry and various suspended liquids such as fibrous liquid and pulp.
2. The sensor structure of the intelligent vortex flowmeter is simple, and there are no moving parts in the measuring tube, nor any throttling parts that hinder the flow of fluid. Therefore, when the fluid passes through the flow meter, it will not cause any additional pressure loss. It is one of the flow meters with the lowest energy consumption in the flow meter.
3. During the measurement process of the intelligent vortex flowmeter, it is not affected by the temperature, viscosity, density and conductivity (in a certain range) of the measured medium. Therefore, the vortex flowmeter can be used to measure the flow of other conductive liquids only after being calibrated by water.
4. The output of the intelligent vortex flowmeter is only proportional to the average flow velocity of the measured medium, and has nothing to do with the flow state (laminar or turbulent) under a symmetrical distribution. Therefore, the vortex flowmeter has a wide range, and its measurement range can reach 100:1, and some even reach an operable flow range of 1000:1.
5. Industrial intelligent vortex flowmeters have a wide range of calibers, ranging from a few millimeters to a few meters, and there are real-flow calibration equipment with a caliber up to 3m in China, which lays the foundation for the application and development of vortex flowmeters.
6. The intelligent vortex flowmeter has no mechanical inertia and has a sensitive response. It can measure instantaneous pulsating flow, as well as flow in both positive and negative directions.