Vortex flowmeter is a kind of fluid oscillation flowmeter developed and put into the market in recent decades, which can be applied to the flow measurement of oil, steam, natural gas, water and other media. It is mainly used for measuring medium, low pressure and medium and small flow of gas (such as pipeline gas in the city, because of safety and other factors, the pressure and flow rate of the gas can not be too high), and has the advantages of no internal mechanical moving parts, good corrosion resistance, and wide range ratio.
The precession vortex flowmeter consists of the following seven basic components:
1. Vortex generator
A helical blade made of aluminum alloy with a certain Angle, which is fixed at the front of the shell contraction section and forces the fluid to produce a strong vortex flow;
⒉ shell
With flange itself, and a certain shape of the fluid channel, according to different working pressure, the shell material can be cast aluminum alloy or stainless steel;
⒊ Intelligent flowmeter integrator
It is composed of an analog channel for temperature and pressure detection, a digital channel for flow detection, a microprocessing unit, a liquid crystal driver circuit and other auxiliary circuits, and is equipped with an outgoing signal interface;
4. Temperature sensor
Pt100/pt1000 platinum resistance is used as temperature sensitive element, and its resistance value corresponds to temperature in a certain temperature range;
5. Pressure sensor
With piezoresistive diffused silicon bridge as the sensitive element, the resistance of the bridge arm will change as expected under the action of external pressure, so the potential difference between the two output terminals is proportional to the external pressure under a certain excitation current;
6. Piezoelectric crystal sensor
Installed in the throat near the expansion section of the housing, the frequency signal of the vortex precession can be detected;
7. disrotator
The vortex flowmeter is fixed in the outlet section of the housing, and its function is to eliminate the vortex flow in order to reduce the influence on the performance of the downstream instrument.
