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, and especially suits the magnetic liquid micro differential pressure measurement field. A first coil L1(1-1), a second coil L2(1-2) and a first sliding rheostat R1, a second sliding rheostat R2 together form an electrical bridge circuit. Voltage signals output by the electrical bridge circuit are input an A / D convertor. The A / D convertor outputs digital signals to a 8031 singlechip to control a motor to drive a worm and gear structure (2) to move upward, so that a rubber stopper is moved out of an upper opening on a left arm of a U-shaped organic glass tube. The left and right arms of the U-shaped organic glass tube are all communicated with atmosphere. The liquid level in the U-shaped organic glass tube is returned to a balance position again, after 0.5s the 8031 singlechip controls the motor to drive the worm and gear structure to move reversely, so that the rubber stopper is re-stuffed in the upper opening on the left arm of the U-shaped organic tube. The device effectively prevents environmental pollution and distortion of a measuring result due to magnetic liquid overflow when the pressure exceeds a critical value.

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 of magnetic liquid micro-differential pressure sensor in my country is still in the experimental stage. During the action, the liquid level of the two arms of the U-shaped glass tube produces a height difference Δh, and then the coil inductance L changes, the balance of the bridge is destroyed, and the pressure difference change is obtained through the voltage change measured by the external circuit. [0003] Since the U-shaped glass tube side of the magnetic liquid micro differential pressure sensor is connected to the atmosphere, when the pressure source P side is pressurized, if P exceeds the critical value, the magnetic liquid will be connected from the U-shaped glass tube to the atmosphere. One s...

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Problems solved by technology

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

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