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Magnetorheological fluid flow mode rheological property testing device

A magnetorheological fluid and flow mode technology, applied in flow characteristics, measuring devices, instruments, etc., can solve problems such as inaccurate results, inaccurate test results, and inability to measure high shear rates of magnetorheological fluids, and achieve liquid The effect of high volume utilization, solving sealing difficulties and simple structure

Active Publication Date: 2020-01-31
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, MR fluids in shear mode will be affected by centrifugation, and the measured results are inaccurate, which means that current testing techniques cannot actually measure MR fluids at high shear rates
There are few reports on the measurement equipment of magnetorheological fluid properties based on the flow mode. The only tube-type magnetorheological fluid testing device also has a large part of the magnetorheological fluid placed outside the electromagnetic field, which will produce magnetorheological fluid. Inaccurate test results caused by the accumulation of suspended particles and the outflow of mother liquor

Method used

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  • Magnetorheological fluid flow mode rheological property testing device

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Embodiment 1

[0034] see Figure 1 to Figure 6 , this embodiment discloses a magnetorheological fluid flow mode rheological property testing device, including a shell 1 and an inner core 2 placed in the inner cavity of the shell 1, an annular gap 3 is provided between the shell 1 and the inner core 2, and the annular gap 3 There is an annular piston 4 inside, and the two ends of the annular piston 4 are respectively sealed and docked with the inner and outer walls of the annular gap 3, and the inner and outer walls of the two ends of the annular piston 4 are respectively provided with sealing rings 5, through which the sealing ring 5 and the annular gap 3 Inner wall or outer wall seal butt joint. The middle section of the annular piston 4 is provided with a slot 6, and the slot 6 and the inner and outer walls of the annular gap 3 together form a housing chamber 7 for accommodating the magnetorheological fluid. Under the action of the driving mechanism, the annular piston 4 can move in the a...

Embodiment 2

[0059] In the second embodiment, except that the installation structure of the coil winding is different from that of the first embodiment, other structural parts and testing procedures are the same as those of the first embodiment. In order to distinguish it from the structural name in Embodiment 1, the shell in this embodiment is represented by shell-18, the inner core is represented by inner core-24, the coil winding is represented by coil winding-20, and the annular gap is represented by annular To express the gap.

[0060] see Figure 7 to Figure 11 , In this embodiment, the installation structure of the coil winding 1 20 is: the coil winding 1 20 is installed on the housing 1 18 . The inner side of the housing one 18 is provided with two inwardly protruding ribs 19, the ribs 19 extend along the axial direction of the housing one 18, the two ribs 19 are oppositely arranged, and each rib 19 is wound with a coil winding 120 The inner wall surface of the rib 19 is arc-shap...

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Abstract

The invention discloses a magnetorheological fluid flow mode rheological property testing device. The device comprises a housing and an inner core, an annular gap is formed between the housing and theinner core, an annular piston is arranged in the annular gap, the two ends of the annular piston are in sealed butt joint with the inner wall and the outer wall of the annular gap respectively, a slot is formed in the middle section of the annular piston, the slot and the inner wall and the outer wall of the annular gap jointly define a containing cavity used for containing magnetorheological fluid, and the annular piston can move back and forth in the annular gap under the action of a driving mechanism so as to drive the magnetorheological fluid to move synchronously. The housing or the inner core is provided with a coil winding, the coil winding is connected with an external current source through a wire, the coil winding generates an electromagnetic field after being electrified, and the generated electromagnetic field can radially and uniformly penetrate the whole section of annular gap; and pressure sensors are respectively mounted at the two sensor mounting holes in the outer side of the housing. Compared with the prior art, the magnetorheological fluid flow mode rheological property testing device has the advantages that a rheological property testing scheme under a magnetorheological fluid flowing mode is provided, and the testing accuracy is guaranteed.

Description

technical field [0001] The invention relates to the field of testing rheological properties of magnetorheological fluids, in particular to a rheological property testing device for flow patterns of magnetorheological fluids. Background technique [0002] Magnetorheological fluid is a controllable intelligent material, which is a suspension made of ferromagnetic particles with high magnetic permeability and low hysteresis and non-magnetic liquid. It exhibits low-viscosity Newtonian fluid characteristics at zero magnetic field, and exhibits high-viscosity, low-fluidity Bingham fluid characteristics under the action of a strong magnetic field. Magnetorheological fluids have been widely used in vibration control, mechanical transmission, polishing technology, automation and other fields. [0003] Measuring the yield stress and response time properties of magnetorheological fluids is of great significance for the design and control methods of magnetorheological devices. Magneto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/00
CPCG01N11/00
Inventor 白先旭何冠男祝安定
Owner HEFEI UNIV OF TECH
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