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Magnetic current and liquid flow variation characteristic measuring system

A technology of magnetorheological fluid and rheological properties, applied in flow characteristics, measuring devices, instruments, etc., can solve the problem of inability to accurately and reliably measure the rheological properties of magnetorheological fluid, low magnetic induction intensity at the center, and low shear rate Inhomogeneity and other problems, to achieve the effect of facilitating material research, not affecting measurement accuracy, and overcoming limitations

Inactive Publication Date: 2008-04-30
SHANGHAI JIAO TONG UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stepper motor that drives the upper plate and the fit gap in the threaded screw that adjusts the height of the lower plate will affect the difference between the actual value and the set value of the distance between the two plates, resulting in calculation errors
Secondly, since the lead-out shafts of the upper and lower plates are made of brass, the magnetic induction at the center is relatively low
Third, in the circular double-plate structure, the shear rate is not uniform along the radial direction, and can only be replaced by an average shear rate
Therefore, it is impossible to accurately and reliably measure the rheological properties of magnetorheological fluids

Method used

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  • Magnetic current and liquid flow variation characteristic measuring system
  • Magnetic current and liquid flow variation characteristic measuring system
  • Magnetic current and liquid flow variation characteristic measuring system

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Embodiment Construction

[0019] Such as figure 1 As shown, the present invention includes: a rotating shaft 1 , a measuring space 2 , an annular magnetic conductor 3 , an epoxy sealing ring 4 , a lead hole 5 , an excitation coil 6 , a main magnetic conductor 7 , a heat transfer fluid guide hole 8 and a base 9 .

[0020] The rotating shaft is made of magnetically permeable material. The upper part of the rotating shaft 1 is cylindrical, which can be clamped by the clamp of the rheometer and rotated under the drive of the motor; the middle part of the rotating shaft 1 is ring-shaped, and there are two narrow The slices extending in the axial direction have an arc length of 2 mm, a length of 11 mm, and a thickness of 0.5 mm. The two slices are symmetrically distributed along a circle with a radius of 10.75 mm. The base 9 maintains the mechanical dimensions of the outer contour of the original base of the rheometer. The middle of the base 9 is a magnetic circuit element, wherein the outer barrel wall of ...

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Abstract

A system for measuring rheological property of magnetic rheological liquid is prepared as setting ring magnetic conductor and main magnetic conductor in base to form measurement space between the two, enabling shear arm under rotary shaft bottom to extend its arm in said space for shearing magnetic rheological liquid in it, setting excitation coil in main magnetic conductor with its two tail ends guided out by leading wire, forming epoxy seal ring by using epoxy glue to seal excitation coil top, and setting a connecting through hole of heat transmission liquid on bottom barrel wall of base and external barrel wall of main magnetic conductor.

Description

technical field [0001] The invention relates to equipment in the field of measurement technology, in particular to a measurement system for rheological characteristics of magnetorheological fluid. Background technique [0002] Magnetorheological fluid is a kind of intelligent fluid material, and its rheological properties are its most basic and critical characteristics. There are also various instruments and methods for measuring the rheological properties of magnetorheological fluid. The existing instruments and methods for measuring the rheological properties of magnetorheological fluids are basically modified and upgraded on the existing rheometers used for measuring the rheological properties of ordinary fluids. A common practice is to add a magnetic field generator to the measurement system to form a magnetic field in the measurement space of the measurement system. The existing commercial rotary rheometers are very perfect in terms of accuracy and function. The basic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N11/14
CPCG01N11/14
Inventor 陈乐生裘揆陈大跃
Owner SHANGHAI JIAO TONG UNIV
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