Anti-magnetic interference flowmeter

Abstract

The invention discloses an anti-magnetic interference flowmeter. The anti-magnetic interference flowmeter comprises a flowmeter body, an anti-magnetic field sensor, a control valve and a controller, wherein the control valve is arranged at a fluid input end of the flowmeter body and / or a fluid output end of the flowmeter body; the anti-magnetic field sensor is fixedly connected with the flowmeter body; a magnetic element in the flowmeter body is outside a detection range of the anti-magnetic field sensor; the anti-magnetic field sensor is electrically connected with the controller; the controller is electrically connected with the control valve; and the anti-magnetic field sensor is used for detecting an external interference magnetic field before or together with the magnetic field sensor in the flowmeter body. The anti-magnetic interference flowmeter provided by the invention can avoid the interference of the external magnetic element for the metering of the flowmeter and can stop fluid supply when offenders use the magnetic elements to prepare to perform embezzlement.

Description

technical field [0001] The invention relates to the field of flow detection, in particular to an anti-magnetic interference flowmeter. Background technique [0002] At present, most of the water meters and gas meters used for daily billing are equipped with flowmeters, and the usage of gas or liquid is recorded through the flowmeter, and the usage of gas or liquid is charged based on this. [0003] Common flowmeters include volumetric flowmeters, turbine flowmeters, etc., which mostly use magnetic field sensors to detect the rotation of magnetic elements set on mechanical elements, and flow meters that export flow or total amount. That is to say, the fluid in the pipeline drives the rotatable mechanical components in the flow meter, and the periodic rotation of the magnetic components on the mechanical components makes the magnetic field detected by the magnetic field sensor change periodically. A signal is generated by which the amount of fluid passing through the meter is...

AI Technical Summary

Problems solved by technology

If illegal elements use external magnetic elements to interfere with the magnetic field sensor, the magnetic field sensor will always detect that it is in the magnetic field under the interference of the magnetic field of the external magnetic element. At this time, the fluid drives the mechanical element to rotate, and the magnetic element set on the mechanical element periodically The rotation has very little effect on the magnetic field at the magnetic field sensor. The magnetic field sensor cannot sense the change of the magnetic field and cannot generate a signal to record and display the amount of fluid passing through the flowmeter. However, the fluid is not recorded after it flows out, resulting in losses for the company that provides the fluid.

Images