Anti-magnetic levitation gas flowmeter with embedded photoelectric detection unit

Abstract

The invention provides an anti-magnetic levitation gas flowmeter with an embedded photoelectric detection unit. The anti-magnetic levitation gas flowmeter includes a housing and a cover plate, the cover plate is arranged on the upper portion of the housing, an anti-magnetic levitation system and a photoelectric bijection-type sensing unit are arranged in the housing, and the anti-magnetic levitation system includes a lifting permanent magnet, an upper pyrolytic graphite plate, a magnet rotor and a lower pyrolytic graphite plate which are arranged from top to bottom in sequence; the magnet rotor is freely suspended between the upper pyrolytic graphite plate and the lower pyrolytic graphite plate; the photoelectric bijection-type sensing unit comprises a laser lamp, a photoresistor, a resistor and a data processor; a corresponding gas inlet hole and a corresponding venting hole are formed in the side wall, on which light is directly emitted from the laser lamp, of the shell of the photoresistor. The magnet rotor is suspended between the pyrolytic graphite plates by means of an anti-magnetic levitation technology, gas pushes the magnet rotor to rotate through the gas inlet hole, correspondingly light rays of the laser lamp are intermittently emitted to the photoresistor, the data processor detects voltage signals on the resistor, and therefore the flow rate of gas is determined.

Description

technical field [0001] The invention relates to the technical field of sensing and metering devices, in particular to an anti-magnetic levitation gas flowmeter with a built-in photoelectric detection unit, which can detect gas flow. Background technique [0002] The current flowmeters are mainly divided into ultrasonic type, electromagnetic type and mechanical type. Ultrasonic flowmeter is a flowmeter that uses the principle that the propagation speed of ultrasonic waves changes with the change of flow rate to measure the flow rate of gas. Electromagnetic flowmeter is mainly used to measure the flow velocity of conductive liquid. The measurement principle of electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. Proportional. The working principle of the mechanical flowmeter is to place the impeller in the gas to be measured and rotate under the impact of the gas flow, and the speed of the impeller rotation reflects the flow rate. For gas flow me...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the technical problems of low resolution, insufficient detection accuracy and complex signal processing circuit of existing gas flowmeters, the present invention proposes an anti-magnetic levitation gas flow meter with built-in photoelectric detection unit, adopts anti-magnetic levitation mechanism, and reduces detection components The motion damping improves the detection accuracy, so as to solve the technical problems that the resolution of the gas flowmeter in the prior art is not fine enough, which leads to the inability to detect the small flow and the complex sensor processing circuit

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