Magnetorheological fluid for sealing

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 ...

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 pressure resistance of the sealing device is high, and the magnetorheological fluid can effectively improve the magnetic field of the magnetorheological fluid made of micron-sized magnetic particles. The solid-like state under the action meets the "zero leakage" requirement required for sealing applications, and has a good application prospect