If you don’t understand vibration, you don’t understand vortex flowmeter
Vortex flowmeter is a commonly used flow measurement instrument, but it is also the type of flow meter with the most faults and after-sales problems. Why are there so many vortex flowmeters with problems? One of the most important reasons is vibration. When it comes to vibration, you should not simply think that it is caused by pipeline vibration on site, but also by product quality reasons.
The principle of vortex street :
Under certain flow conditions, part of the fluid kinetic energy is converted into fluid vibration, and its vibration frequency has a certain proportional relationship with the flow velocity (flow rate). The flowmeter that works according to this principle is called a fluid vibration flowmeter, and the vortex flowmeter is one of them . Therefore, if you don’t understand vibration, you don’t understand vortex. Vortex flowmeters are developed and produced based on the Karman vortex principle. They are mainly used for flow measurement of industrial pipeline medium fluids, such as gas, liquid, steam and other media. Vortex flowmeters use the principle of fluid oscillation to measure flow. When the fluid passes through the vortex flow transmitter in the pipeline, two columns of vortices proportional to the flow velocity are generated alternately up and down behind the vortex generator of the triangular column. The release frequency of the vortex is related to the average velocity of the fluid flowing through the vortex generator and the characteristic width of the vortex generator.
Reducing the impact of vibration on the measurement data of the vortex flowmeter can be achieved in the following ways :
1. Install the fixed bracket: When installing the vortex flowmeter, use a fixed bracket to fix its position, which can effectively reduce the impact of vibration on it. The selection of the bracket should comply with relevant standards and have good earthquake resistance.
2. Use seismic isolation devices: Add seismic isolation devices, such as shock absorbers, spring seismic isolation devices, etc., at the connection between the vortex flowmeter and the pipeline to reduce the impact of external vibrations on its transmission.
3. Strengthen maintenance: Regularly maintain the vortex flowmeter, check whether its fixings are loose, and whether there is abnormal vibration. If any problems are found, repair or replace them in time to ensure the normal operation of the vortex flowmeter.
4. Choose a suitable environment: When selecting a location for a vortex flowmeter, try to choose a place with stable environmental conditions and little vibration, and avoid installing it in a place that is susceptible to vibration interference, so as to fundamentally reduce the impact of vibration on its measurement.
5. Adjust the installation orientation: Adjust the installation orientation of the vortex flowmeter according to the main vibration direction of the pipeline so that its Z axis coincides with the main vibration direction, thereby reducing the impact of vibration on the measurement.
Add pipe fixing brackets: Add fixing brackets downstream of the flow meter to limit the pipeline amplitude and sometimes increase the resonant frequency of the pipe system, which is beneficial to noise reduction.
6. Adjust the instrument circuit settings: By adjusting the instrument circuit settings, try to eliminate the influence of vibration noise.
7. Adopt specific processing methods: such as high-frequency vibration suppression technology and signal processing technology, to reduce the interference of high-frequency vibration signals generated by fluid flow in pipelines to measurement, and extract useful flow signals,to obtain Accurate measurements.
Through the above method, the impact of vibration on the measurement data of the vortex flowmeter can be significantly reduced, and the accuracy and reliability of the measurement can be ensured ;
