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Why can elliptic gear flowmeter appear error

Why can elliptic gear flowmeter appear error

  • February 22,2020.


Elliptic gear flowmeter belongs to the more precise instrument, the measurement accuracy is high, is suitable for the high viscosity medium flow measurement.It relies on the pressure head of the measured medium to push the elliptical gear to rotate.The larger the viscosity of the medium, the smaller the leakage from the gear and the measurement gap, so the nuclear measurement of the medium the larger the viscosity, the smaller the leakage error, the more favorable to the measurement.Therefore, it is not difficult to find from the measuring principle that it is measured by relying on the pressure head of the measured medium to push the elliptical gear to rotate, independent of the fluid flow state.For the fluid with solid particles, it is not suitable to use the gear flowmeter, because the solid particles will be the gear stuck, resulting in the inability to measure the flow rate;It is also important to note that this type of flowmeter is not recommended for medium with gas in the liquid, since the measurement error can be quite large.

Oval gear flowmeter measurement part is mainly composed of two mutually meshing elliptical gear and its shell (measuring room), elliptical gear turn every week the parallelism of the measured medium quality for half moon volume 4 times, in the half moon volume given conditions, as long as the measure of elliptic gear rotational speed n, can know the measured medium flow.Local display the rotation of the gear through a series of deceleration and speed ratio adjustment mechanism, directly connected to the indicator needle on the instrument panel, and through the mechanical counter to display the total amount.Remote transmission display is mainly through the deceleration of the gear drive the magnet rotation, so that the contact of the spring relay with the same rotation frequency with the magnet synchronously closed or disconnected, so as to send a series of electrical pulse far to another display instrument.

When we use the flowmeter to measure the liquid with large viscosity, the leakage amount from the gear and the measurement space will be less. Therefore, the larger the viscosity of the measured liquid, the smaller the leakage error, which is more favorable to the measurement and the higher the measurement accuracy.It can be said that the elliptical gear flowmeter is an ideal choice for measuring the flow rate of liquid with high viscosity.

In the application process of elliptic gear flowmeter, the flow rate range is often too large and inaccurate.

1, the flow range in the selection of the flowmeter when too large or too small is not within the normal range of the flowmeter.

2. Gear is stuck by debris, resulting in inaccurate flow measurement.

3, because the long-term use frequency is too high, resulting in wear gear, flow rate display is not accurate.

4, when using the pump, the pump pressure is too large or too small, will also lead to the flow of the elliptical gear flowmeter is not allowed.



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