Magnetic liquid micro differential pressure sensor

Abstract

The embodiment of the invention provides a magnetic liquid micro differential pressure sensor, which belongs to the technical field of mechanical engineering measurement, and comprises a pipe body, one end of the pipe body is provided with an end cover, and the other end of the pipe body is provided with an air inlet piece; the composite magnetic core is positioned in the tube body; the composite magnetic core comprises two magnet pieces, and the two magnet pieces are connected through a connecting frame. Wherein the magnet piece comprises at least two permanent magnets, and a separation pad is arranged between every two adjacent permanent magnets; the magnetic liquid is located between the outer side wall of each permanent magnet in the magnet piece and the inner wall of the pipe body; the Hall element is arranged on the outer wall of the tube body; the return magnet is arranged on the end cover, and the magnetic pole, facing the adjacent magnet piece, of the return magnet is the same as the magnetic pole, facing the return magnet, of the magnet piece. According to the magnetic liquid micro-differential pressure sensor provided by the embodiment of the invention, the sealing stage number of the magnetic liquid micro-differential pressure sensor can be increased, and the pressure resistance of the magnetic liquid micro-differential pressure sensor is improved.

Description

technical field [0001] The embodiments of the present application relate to the technical field of mechanical engineering measurement, and in particular, to a magnetic liquid differential pressure sensor. Background technique [0002] Magnetic liquid is a new type of functional material that has both the fluidity of liquid and the response to magnetic field. It has broad application prospects in the fields of sealing, sensing, and vibration reduction. The micro pressure sensor developed by using the characteristics of magnetic liquid is widely used in the industrial field. Compared with the traditional micro differential pressure sensor, the magnetic fluid micro differential pressure sensor has the advantages of simple structure, small volume, no mechanical wear, high sensitivity, impact resistance and energy consumption. Low and low frequency response and other advantages. [0003] However, the sealing performance of the current magnetic liquid differential pressure sensor...

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Problems solved by technology

[0003] However, the current magnetic liquid micro-pressure differential sensor is not well sealed. When the air pressure on both sides increases, it is easy to break through the seal of the magnetic liquid micro-pressure differential sensor, resulting in sensor failure and greatly reducing the measurable micro-pressure range of the sensor.

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