Novel turbine volumetric flowmeter with high precision

Abstract

The invention relates to a novel turbine volumetric flowmeter with high precision, comprising a shell, lock nuts, two guide cylinders, a sensor, bearings, a turbine rotor body, a magnet steel, a large lead deep groove and a large helical turbine piece. The shell is H-shaped, and the two guide cylinders are connected with the shell by the lock nuts. One end of each guide cylinder is connected with the lock nuts, and the other end of each guide cylinder is connected with the bearings. The sensor is arranged at the middle part of the shell, and the bearings are arranged at the two ends of the large lead deep groove. The turbine rotor body is arranged at the outside of the large lead deep groove, the magnet steel is arranged on the turbine rotor body, and the large helical turbine piece is arranged in the large lead deep groove. Compared with the prior art, the flowmeter provided by the invention integrates the advantages of the velocity type flowmeter and the advantages of volumetric flowmeter, has the characteristics of simple structure, less pressure loss, high sensitivity, low cost, good stability, high precision, less purity requirement for media, and no requirement for the front and rear straight pipes of the flowmeter in the installation process, and can measure the instantaneous flow and the accumulated flow.

Description

technical field [0001] The invention relates to a flowmeter, in particular to a novel high-precision turbine volumetric flowmeter. Background technique [0002] The flow meter is used to measure the amount of liquid (or gas) flowing through the cross-section of the pipe per unit time (also known as instantaneous flow) and the total amount of liquid (or gas) flowing through the cross-section of the pipe within a certain period of time (also known as cumulative flow) instrumentation. [0003] At present, flow meters at home and abroad are divided into two categories in principle: one is called speed meter, which is typical of turbine flow meter. There is often a rotor in this kind of meter. Rotor rotation frequency, which is proportional to the rate at which the fluid flows through the cross-section of the pipe, thereby obtaining the instantaneous flow rate of the fluid flowing in the pipe. This instrument has high sensitivity, small pressure loss, simple structure and low c...

AI Technical Summary

Problems solved by technology

However, due to its own rotor and bearing structure, it has high requirements on the purity of the medium, that is, the medium cannot contain any impurities, otherwise the rotor will be stuck.

This kind of instrument can only be applied to media such as water, milk and refined oil, and cannot be applied to media containing impurities (such as crude oil, etc.) that are widely used in industrial production.

In addition, long-term use will cause the rotor and bearing to wear out, the instrument coefficient will change, and the stability of the instrument will be poor.

This kind of instrument is very sensitive to the velocity distribution of the fluid on the cross-section of the pipeline. Therefore, in order to ensure the consistency between the measurement verification and the actual use, it is often required to have a certain length of straight pipe section before and after the instrument, which brings great difficulties to the installation and design in actual use. big trouble

[0004]The second category is called volumetric meters, represented by waist wheel flowmeters and oval gear flowmeters. There are metering chambers in this kind of meters. When the flow rate fills the metering chambers Finally, through the rotation of the cavity, the fluid in the cavity flows downstream, and the total flow through the meter flowing downstream can be obtained by measuring the number of rotations of the metering cavity in this way. Therefore, the positive displacement meter measures the cumulative flow, and this kind of meter has high measurement accuracy. , good stability, low requirements for medium purity, but complex structure, high cost, large pressure loss, low sensitivity, large instrument structure

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