Magnetic-liquid micro differential pressure sensor

A micro differential pressure sensor, magnetic liquid technology, applied in the direction of measuring fluid pressure, pressure difference measurement between multiple valves, instruments, etc., can solve the problems of high cost, weak sensor signal, large volume, etc.

Inactive Publication Date: 2014-02-26
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention: In the field of micro-pressure measur...

Method used

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Embodiment Construction

[0015] The present invention will be further described with accompanying drawing as specific embodiment:

[0016] A magnetic liquid micro pressure difference sensor, the device includes: plexiglass tube 1, left rubber plug 2-1, right rubber plug 2-2, left coil 3-1, right coil 3-2, left ring magnet 4-1 , right ring magnet 4-2, hollow permanent magnet 5, iron core 6, magnetic liquid 7, first fixed value resistor R1, second fixed value resistor R2, AC power supply U and voltmeter V.

[0017] First, the high-strength enamelled copper wire is uniformly, equal number of turns, and symmetrically wound on the left and right sides of the plexiglass tube 1 to form a left coil 3-1 and a right coil 3-2, and the distance between the two coils is equal to the length of the hollow permanent magnet 5; Then the iron core 6 is inserted in the hollow permanent magnet 5, the iron core 6 is equal to the length of the hollow permanent magnet 5, and the two form a composite magnetic core together; t...

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Abstract

A magnetic-liquid micro differential pressure sensor is suitable for the field of micro pressure measuring. The magnetic-liquid micro differential pressure sensor comprises an organic glass tube (1), a left rubber plug (2-1), a right rubber plug (2-2), a left coil (3-1), a right coil (3-2), a left ring magnet (4), a right ring magnet (4-2), a hollow permanent magnet (5), an iron core (6), magnetic liquid (7), a first constant-value resistor (R1), a second constant-value resistor (R2), an alternating current power supply (U) and a voltmeter (V). Enamelled copper wires are wound around the left side and the right side of the organic glass tube (1), the magnetic liquid (7) is injected after a composite magnetic core is added, the left end of one coil and the right end of the other coil are sleeved with the ring magnets respectively, it should be guaranteed that the dotted terminals of the ring magnets and the composite magnetic core are opposite and used for providing restoring force, and finally the rubber plugs are inserted. The left end is connected with a pressure source (P), the right end is connected with the atmosphere, and a bridge circuit is formed by the two coils and the two resistors (R1 and R2) having the same value; when micro pressure acts, the composite magnetic core moves in the tube, and obvious voltage values are output.

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 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] Because the existing magnetic liquid micro-pressure difference sensor adopts U-shaped...

Claims

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Application Information

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IPC IPC(8): G01L13/06
Inventor 李德才谢君
Owner BEIJING JIAOTONG UNIV
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