Anti-overflow device of magnetic liquid micro differential pressure transducer

Abstract

The invention relates to an anti-overflow device of a magnetic liquid micro differential pressure transducer, and belongs to an auxiliary device of the magnetic liquid micro differential pressure transducer. The anti-overflow device of the magnetic liquid micro differential pressure transducer is suitable for measuring magnetic liquid micro differential pressure. The anti-overflow device of the magnetic liquid micro differential pressure transducer solves the problems of environmental pollution and distortion of a measuring result, wherein the problems are caused by magnetic liquid overflow when pressure exceeds a critical value. The anti-overflow device comprises a high-strength enamelled copper coil L1 (1-1), a high-strength enamelled copper coil L2 (1-2), a sliding rheostat R1, a sliding rheostat R2, an alternating current power source U, a voltmeter V, an analog-to-digital (A / D) converter, an 8031 singlechip, a motor and a worm and gear structure (2). The high-strength enamelled copper coil L1 (1-1) and the high-strength enamelled copper coil L2 (1-2) are evenly wound on the upper portion of the right arm of a U-shaped organic glass tube of the magnetic liquid micro differential pressure transducer with equal number of turns to form coils. One coil is connected with the equivalent sliding rheostat R1 in series, the other coil is connected with the equivalent sliding rheostat R2 in series, and then the coils are connected at two ends of the alternating power source U in parallel. A voltage signal output by a bridge circuit passes the A / D converter and then the 8031 singlechip controls the motor to rotate to drive the worm and gear structure to move upwards, therefore, a rubber tube is moved out of the U-shaped tube, and a liquid level inside the U-shaped tube gets back to a balancing position again.

Description

technical field [0001] The invention belongs to an auxiliary device of a magnetic liquid micro-pressure difference sensor, and is particularly suitable for the field of magnetic liquid micro-pressure difference measurement. Background technique [0002] At present, the research on the magnetic liquid micro-pressure difference sensor in our country is still in the experimental stage. The principle is as follows: the U-shaped plexiglass tube is equipped with a magnetic liquid, the two arms are wound with a coil and connected to an alternating current, and the external circuit resistance forms a bridge circuit. When the difference is applied, the liquid surface of the two arms of the U-shaped plexiglass tube produces a height difference Δh, and then the coil inductance L changes, and the balance of the bridge is destroyed. The voltage change measured by the external circuit is used to obtain the pressure difference change. [0003] Since one side of the U-shaped plexiglass tube...

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Problems solved by technology

[0003] Since one side of the U-shaped plexiglass tube of the magnetic liquid differential pressure sensor is connected to the atmosphere, when the pressure source P is pressurized, if P exceeds the critical value, the magnetic liquid will flow from the U-shaped plexiglass tube to the atmosphere. The connected side overflows, causing environmental contamination and distortion of measurement results

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