I. Overview

Precession vortex flowmeter is designed by using the precession phenomenon of fluid vortex, piezoelectric crystal as sensing element and microcomputer technology. The products are widely used in petroleum, chemical, electric power, metallurgy, urban gas supply and other industries to measure the flow of various gases, is the current oil field and city natural gas transmission and distribution measurement and trade measurement of choice products.

Two, product characteristics

● No mechanical moving parts, corrosion resistance, stable and reliable, long life, long-term operation without maintenance;

● Using computer chip, high integration, small size, good performance, the whole machine function;

● The use of special display, display number of bits, can directly display the volume flow under the working state, the volume flow under the standard state, the total amount, and media pressure, temperature and other parameters.

● Using EEPROM technology, easy to set the parameters, and can save 400 groups of flow data;

● Pulse, analog signal output, and has RS485 interface;

● The use of special MODEM, through the telephone network can realize the computer remote centralized management.

Intelligent flowmeter set flowmeter, microcomputer, pressure, temperature sensor in one, using built-in structure, so that the structure is more compact, can directly measure the flow rate of fluid, pressure and temperature, and automatic real-time tracking compensation and compression factor correction; The dual detection technology effectively improves the signal detection intensity and successfully restrains the interference caused by pipeline vibration.

Three, the working principle

The profile of the case profile of the precession vortex flowmeter is similar to the profile of Venturi tube, with large ends and small middle. There is a set of guide blades for forcing vortex generation in the contraction section at the inlet side, and a rectifier grid for eliminating vortex flow at the outlet side to restore the axial flow of the fluid. When the fluid flows into the flow sensor, the guide vane at the entrance forces the axial flow to rotate, and the center of the rotating flow generates a vortex flow due to the accelerated flow of the fluid in the contraction section. At this time, as the tube section shrinks, the vortex flow concentrates on the central axis. When the vortex fluid enters the diffusion section, because the velocity slows down, the rotating fluid is affected by the backflow and begins to do a secondary rotation. The vortex flow has a turning point (at this point, the axial velocity component of the fluid is zero) and the vortex precession phenomenon is formed, so it is called the precession vortex. After the precession frequency signal is measured by the detecting element, the total flow rate, temperature and pressure are displayed by the secondary instrument.