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The principle of Precession Vortex Flowmeter

The principle of Precession Vortex Flowmeter

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1. built-in pressure, temperature and flow sensor, high safety performance, compact structure, beautiful appearance.2. temperature, pressure, instantaneous flow and accumulated flow are displayed locally.3. using the new signal amplifier and unique filtering technology, effectively removes the interference signal generated by the vibration of pressure fluctuation and pipeline, greatly improves the anti-interference ability of the flowmeter, small flow and has excellent stability.4. unique time display and real-time data storage function, no matter what the situation, can guarantee the internal data will not be lost, can be permanently stored.5., the power consumption of the whole machine is very low, and the utility model can be operated by an internal battery for a long time. The utility model is an ideal local display instrument without external power supply.6., anti-theft function is reliable, with password protection, to prevent parameter changes.7. meter head can rotate freely at 180 degrees, easy installation.
The principle of Precession Vortex flowmeter:As the fluid passes through a vortex generator composed of spiral vanes (see Figure 1), the fluid is forced to rotate violently around the body axis, forming a vortex. When the fluid enters the diffusion section, the vortex flow is subjected to the action of circumfluence, and begins to rotate for two times, thus forming a gyroscopic vortex precession phenomenon. The precession frequency is proportional to the flow rate and is not affected by the physical properties and density of the fluid. The sensor detects the two rotational precession frequency of the fluid, and then knows the flow rate. And it can obtain good linearity in a wide range of flow.
The Reynolds equation, f=StV/d, ST, is also a Reynolds function, so that when the Reynolds number is greater than 20000, it is a linear function. According to this principleI have to say some of the popular, when the flag is fluttering in the wind, swing, swing when the airflow is increased, the higher the frequency, the frequency and flow velocity has a certain speed after a fixed relationship. Vortex flowmeter is made by this principle
When the fluid flow along the axial of the sensor into the product, in the vortex generating body under the action of forced rotation around a center line, vortex flow, vortex flow in the venturi tube is screwed, reach the contraction suddenly after throttling, the vortex flow acceleration, when the diffusion section, the vortex center along a cone spiral precession. At this point, the precession frequency of the vortex center is proportional to the flow velocity of the fluid through the detection point. The eddy current is detected by a piezoelectric sensor, and the precession frequency signal is converted into traffic value after amplification, filtering and shaping.

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