Magnetic liquid micro-pressure difference sensor of composite magnetic core

A micro differential pressure sensor, magnetic liquid technology, applied in the pressure difference measurement between multiple valves, fluid pressure measurement, instruments and other directions, can solve the problems of fixed volume, weak signal, and the distance between the input gas port cannot be flexibly changed, etc. Achieve the effect of obvious output electrical signal and cost reduction
CN105547574AActive Publication Date: 2016-05-04HEBEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HEBEI UNIV OF TECH
Publication Date
2016-05-04

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Abstract

The invention discloses a magnetic liquid micro-pressure difference sensor of a composite magnetic core, comprising a sensor main body and a bridge circuit portion; the sensor main body comprises two identical parts, wherein each part comprises an organic glass tube, a rubber plug, a coil, an annular permanent magnet, a composite magnetic core and a magnetic liquid; the organic glass tube comprises a large diameter portion and a small diameter portion; a rubber plug is plugged into the top end of the large diameter portion on the top, the composite magnet core is arranged on the inner side of the middle portion, and a coil is wounded on the outer side of the lower end; two ends of the composite magnet core absorb the magnetic liquid in a saturation manner; the annular permanent magnet sleeve the small diameter portion on the lower part; the bottom end of the small diameter is connected to a flexible tube which communicates with the two portions of the sensor main body; and the composite magnet core comprises a magnet core, a first permanent magnet and a second permanent. The invention can measure the air pressure difference in the vertical direction and output the evident electric signals. The distance between the two ports for measuring the air pressure difference is adjustable and the cost can be dramatically reduced.
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Description

technical field

[0001] The invention belongs to a magnetic liquid micro-pressure difference sensor, and is particularly suitable for the field of 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 level of the two U-shaped tube arms 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] The magnetic liquid differential pressure sensor is usually designed with a U-shaped tube, and the magnet...

Claims

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