Device for testing rheological properties of magnetorheological fluid

Abstract

The invention discloses a device for testing rheological properties of magnetorheological fluid, comprising a support, a motor, a rotating shaft, a static shaft and a shell. The device is characterized in that the lower end of the rotating shat extends into the shell and the lower end part of the rotating shaft is fixedly provided with a rotating disc, the upper end of the static shaft extends into the shell and the upper end part of the static shaft is fixedly provided with a static disc, a magnetic isolation disc and an annular magnetorheological fluid cavity are arranged between the rotating disc and the static disc, a sealing ring is sleeved on the static disc, the shell is internally provided with a magnetic isolation ring and an exciting coil, the magnetic isolating ring is arrangedbetween the sealing ring and the exciting coil, the support is fixedly provided with a torque sensor, the lower end of the static shaft is connected with the torque sensor, and the upper end of the rotating shaft is connected with the output shaft of the motor. The device disclosed by the invention has the advantages that: the magnetorheological fluid cavity is arranged outside the magnetic isolation disc, thus the edge gathering effect of the magnetorheological fluid to be tested is reduced, and the consumption of the magnetorheological fluid is reduced; and the magnetorheological fluid cavity is arranged at the middle part of the exciting coil, thus a magnetic field at the magnetorheological fluid to be tested is strongest, the verticality and uniformity of the magnetic field are good, and the heat productivity is low.

Description

technical field [0001] The invention relates to the field of research on the properties of magnetorheological fluids, in particular to a testing device for the rheological properties of magnetorheological fluids. Background technique [0002] Magnetorheological fluid behaves as a low-viscosity flowable Newtonian fluid under zero magnetic field, while suspended particles are polarized under the action of an external magnetic field to form a chain-like columnar structure parallel to the magnetic field, which prevents the flow of fluid As a result, the viscosity of the suspension increases sharply, and the shear yield stress also increases approximately linearly, showing a property similar to that of a solid. When the external magnetic field is removed, it quickly returns to its original flow properties. Therefore, shear yield stress and viscosity are the main performance parameters of magnetorheological fluid, which characterize the degree of solidification of this material un...

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Problems solved by technology

Although the pipe flow mode test can obtain a higher shear rate, the polarized suspended particles are easy to gather in the pipe under the action of a higher magnetic field, while the mother liquor flows out along the pipe, resulting in the volume ratio of the magnetorheological fluid in the pipe The local increase of the concentration will make the measurement result higher, and it will also produce the wall slip effect; the concentric cylinder rotation test will produce a fan-shaped magnetic field because the diameters of the inner and outer cylinders are not equal, and there are defects in principle; and for parallel disks For the disk rotation test, when the rotation speed of the disk is too high, the suspended particles in the magnetorheological fluid will gather to the edge of the disk under the action of centrifugal force, and there will be a wall slip effect; and the amount of magnetorheological fluid used in the test more, wasteful

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