Magnetorheological fluid for sealing

A magnetorheological fluid, base carrier fluid technology, applied in magnetic fluids, petroleum industry, other chemical processes, etc., can solve the problems of high pressure resistance and low pressure resistance of sealing devices, and achieve improved pressure resistance, magnetic The effect of high conductivity and broad application prospects

Inactive Publication Date: 2014-05-14
BEIJING JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of low pressure resistance of magnetic liquids in sealing applications, the present invention proposes a magnetorheological fluid made of micro-nano magnetic particles as a suspension phase. Compared with The magnetic fluid made of nano-sized magnetic particles has a large magnetic permeability, and the press

Method used

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Examples

Experimental program
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Embodiment Construction

[0009] First pour 400 ml of deionized water into the beaker, then weigh 18 grams of micron-sized magnetic particles and 12 grams of nano-sized magnetic particles, and pour them evenly into the beaker filled with deionized water, stir, and heat to 80 ° C, then Add 12 ml of oleic acid and stir at 80°C for 3 hours. Then, pour out the heated mixed solution from the beaker, and clean it, wash it several times with deionized water until the pH of the mixture is neutral, mix it with 16 grams of carrier liquid mineral oil after vacuum drying, and stir 2 hours, and finally carry out mechanical mixing on a ball mill for 5 hours to obtain the magnetorheological fluid used in sealing of the present invention. It can be seen from the dynamic sealing experiment of the sealing material that under the same conditions, the pressure resistance of the magnetic liquid of the present invention is more than three times that of common magnetic liquids.

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Abstract

The invention provides a magnetorheological fluid for sealing. The magnetorheological fluid is composed of micro/nano-scale magnetic particles, a basic carrier fluid and additives, wherein the mass percent of the micro-nano-scale magnetic particles is 47-89.5%, and the mass ratio of the micro-scale magnetic particles to the nano-scale magnetic particles ranges from 0.2: 1 to 4.5: 1, and moreover, the particle size range of the micro-scale magnetic particles is from 2 microns to 20 microns, while the particle size range of the nano-scale magnetic particles is from 1nm to 15nm; the mass percent of the additives is 0.5-3%, while the mass percent of the basic carrier fluid is 10-50%. The magnetorheological fluid is better in sealing effect than the magnetorheological fluid which is obtained from single micro-scale magnetic particles, and capable of meeting the requirement for zero leakage of sealing; the magnetorheological fluid has magnetic conductivity better than the magnetorheological fluid which is obtained from single nano-scale magnetic particles, and therefore, the pressure endurance capability of a magnetorheological fluid sealing device is obviously improved.

Description

technical field [0001] The invention relates to a magnetorheological fluid, in particular to a magnetorheological fluid for sealing. Background technique [0002] Magnetorheological fluid is mainly composed of micron-sized ferromagnetic particles, base carrier liquid and additives. It is an intelligent fluid that can instantly transform from a free-flowing liquid to a semi-solid or even solid under the action of an external magnetic field, showing controllable rheological characteristics. Materials, mainly used in vibration reduction, polishing and other fields. Magnetic liquid is a magnetic liquid substance in which nano-scale magnetic particles are uniformly dispersed in a base carrier liquid, and is mainly used in sealing, lubrication, heat transfer and other fields. Compared with magnetic fluids, magnetorheological fluids have higher magnetic permeability and relatively higher pressure resistance in sealing applications, but magnetorheological fluids composed of single ...

Claims

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Application Information

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IPC IPC(8): C10M169/04H01F1/44C09K3/10C10N40/14C10N30/06
Inventor 李德才王四棋
Owner BEIJING JIAOTONG UNIV
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