Magnetic-liquid micropressure differential sensor with branch tube
A micro-pressure differential sensor and magnetic liquid technology, applied in the field of sensors, can solve the problem that the magnetic liquid micro-pressure differential sensor cannot meet the measurement requirements
Inactive Publication Date: 2014-12-10
BEIJING JIAOTONG UNIV
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Problems solved by technology
[0003] The technical problem to be solved by the present invention: when the absolute pressure value of two places in the industrial equipment is very large, and the relative pressure difference between the two places is very small, the original magnetic liquid micro-pressure difference sensor cannot meet the measurement requirements The problem
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[0014] to attach figure 1 The present invention will be further described for the specific embodiment:
[0015] A magnetic liquid micro-pressure differential sensor with a branch tube, the device includes: a transparent glass tube 1, a first cylindrical hollow permanent magnet 2-1, a second cylindrical hollow permanent magnet 2-2, and a first induction coil 3-1 , second induction coil 3-2, first magnetic liquid ring 4-1, second magnetic liquid ring 4-2, first cylindrical permanent magnet 5-1, second cylindrical permanent magnet 5-2, iron core 6 , The first limiter 7-1, the second limiter 7-2.
[0016] Connections between the parts of the device:
[0017] Wind high-strength enamelled copper wires evenly, symmetrically, and with equal turns to both ends of the transparent glass tube 1 to form the first induction coil 3-1 and the second induction coil 3-2 respectively; the first cylindrical hollow permanent Magnet 2-1 and first limiter 7-1 are put into one end that branch pipe...
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The invention relates to a magnetic-liquid micropressure differential sensor with a branch tube and is applicable to micropressure differential measurement. The magnetic-liquid micropressure differential sensor comprises a transparent glass tube (1), a first cylindrical hollow permanent magnet (2-1), a second cylindrical hollow permanent magnet (2-2), a first induction coil (3-1), a second induction coil (3-2), a first magnetic liquid ring (4-1), a second magnetic liquid ring (4-2), a first cylindrical permanent magnet (5-1), a second cylindrical permanent magnet (5-2), an iron core (6), a first limiter (7-1) and a second limiter (7-2). The first cylindrical permanent magnet (5-1), the second cylindrical permanent magnet (5-2) and the iron core (6) constitute a composite magnetic core, and the composite magnetic core moves within a limited range of limiters. By the aid of the branch tube of the transparent glass tube, pressure in the middle of the composite magnetic core synchronously changes with pressure of the left end of the composite magnetic core, and micropressure differential measurement under the conditions that absolute pressure at two positions of industrial equipment is high and relative pressure is low is realized.
Description
technical field [0001] The invention belongs to the field of sensors and is suitable for micro pressure difference measurement. Background technique [0002] At present, there are two main structural forms of the magnetic liquid differential pressure sensor. One is the U-shaped tube-type magnetic liquid differential pressure sensor. When the alternating current is input and the resistance of the external circuit forms a bridge circuit, when there is a pressure difference, 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 measured value through the external circuit The voltage change is then obtained to obtain the pressure difference change. This type of magnetic liquid micro-pressure difference sensor has a weaker output signal and a larger volume; the other is an iron-core magnetic liquid micro-pressure difference sensor, such as patents ...
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IPC IPC(8): G01L13/06
Inventor 李德才谢君
Owner BEIJING JIAOTONG UNIV