A large-range magnetic liquid micro-pressure differential sensor
A technology of micro-pressure differential sensor and magnetic liquid, which is applied in the direction of measuring fluid pressure, instruments, measuring devices, etc., and can solve the problems that cannot meet the needs of micro-pressure measurement and the measurement range is small
Active Publication Date: 2017-10-31
BEIJING JIAOTONG UNIV
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Problems solved by technology
[0003] The measurement range of this kind of magnetic liquid micro-pressure difference sensor is about 0Pa~1000Pa, and the measurement range is too small to meet the needs of most micro-pressure measurements.
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[0013] The present invention will be further described with accompanying drawing as specific embodiment:
[0014] A large-range magnetic liquid micro-pressure difference sensor, the device includes: a left ring magnet 1-1, a right ring magnet 1-2, a left coil 2-1, a right coil 2-2, a magnetic liquid seal ring 3, a first permanent Magnet 4-1, second permanent magnet 4-2, iron core 5, plexiglass tube 6.
[0015] The high-strength enamelled copper wire is evenly wound on the left and right sides of the plexiglass tube with equal turns and symmetrically to form the left coil 2-1 and the right coil 2-2, and the distance between the two coils is about 5mm; then the first permanent magnet 4-1 and the second permanent magnet 4-2 are adsorbed on the two ends of the iron core 5 to ensure that the opposite ends of the two permanent magnets 4-1 and 4-2 are opposite, and the two permanent magnets and the iron core 5 form a composite magnetic core together. The diameter of the core is smal...
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Abstract
A large-range magnetic liquid micro-pressure differential sensor is suitable for the field of micro-pressure measurement. The device comprises: left ring magnet (1‑1), right ring magnet (1‑2), left coil (2‑1), right coil (2‑2), magnetic liquid sealing ring (3), first permanent magnet (4‑1), the second permanent magnet (4‑2), iron core (5), plexiglass tube (6). Wind the copper wire evenly and symmetrically on the plexiglass tube, put the composite magnetic core with four magnetic liquid sealing rings absorbed into the plexiglass tube, and then put the left ring magnet and the right ring magnet on the left side of the plexiglass tube respectively and right side. When the micro pressure acts, the composite magnetic core moves left and right in the tube. Since the magnetic permeability of the iron core is much greater than that of air, and the magnetic liquid constitutes a four-stage sealing ring, the output signal of the magnetic liquid micro pressure difference sensor is obvious, and the pressure resistance capacity Enhanced, larger range.
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] The measurement range of this kind of magnetic liquid micro-pressure difference senso...
Claims
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IPC IPC(8): G01L13/06
Inventor 李德才谢君
Owner BEIJING JIAOTONG UNIV