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Method for preventing sedimentation and glomeration of magnet rheological fluid on standing

A magnetorheological fluid, standing technology, applied in chemical instruments and methods, mixing methods, magnetic liquids and other directions, can solve the problems of difficult precipitation and agglomeration, magnetorheological fluid precipitation or agglomeration, etc., to prevent sedimentation and agglomeration, The effect of increasing the production cost

Inactive Publication Date: 2006-07-19
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The inventors of the present invention have found that magnetorheological fluid is not easy to precipitate and agglomerate in a flowing or shearing state, but when the magnetorheological fluid is in a static state, it is included in a magnetorheological fluid device, such as a magnetorheological fluid damper, For magnetorheological fluid brakes and magnetorheological fluid transmissions, when the device is static or not working, the magnetorheological fluid in it is also prone to precipitation or agglomeration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] According to the formula that the volume ratio of carbonyl iron powder in the magnetorheological fluid is 40%, and the volume ratio of carrier liquid is 60%.

[0020] The first step is to weigh 312g of carbonyl iron powder, 60g of silicone oil, and 3g of polyvinylpyrrolidone, and add them to a 200ml polytetrafluoroethylene beaker, stir them evenly with a glass rod, then mix them with a stirrer at a speed of 600rpm for 5 minutes, and then use The mixer was mixed at a speed of 1000rpm for 3 minutes to obtain a uniform magnetorheological fluid with good suspension;

[0021] In the second step, the magnetorheological fluid prepared in the first step is packed into a 150ml plastic bottle with a cover and tightly sealed;

[0022] In the third step, the plastic bottle containing the magnetorheological fluid obtained in the second step is placed in a magnetic field whose size can be adjusted, and the magnetic field strength is adjusted to 25mT;

[0023] The fourth step is to t...

Embodiment 2

[0026] The volume ratio of the carbonyl iron powder in the magnetorheological fluid is 45%, and the volume ratio of the carrier liquid is 55%.

[0027] The first step is to weigh 351g of carbonyl iron powder, 55g of silicone oil, and 3g of polyvinylpyrrolidone, and add them to a 200ml polytetrafluoroethylene beaker, stir them evenly with a glass rod, then mix them with a stirrer at a speed of 600rpm for 5 minutes, and then use The mixer was mixed at a speed of 1000rpm for 3 minutes to obtain a uniform magnetorheological fluid with good suspension;

[0028] In the second step, the magnetorheological fluid prepared in the first step is packed into a 150ml plastic bottle with a cover and tightly sealed;

[0029] In the third step, the plastic bottle containing the magnetorheological fluid obtained in the second step is placed in a magnetic field whose size can be adjusted, and the magnetic field strength is adjusted to 10mT;

[0030] The fourth step is to take the magnetorheolog...

Embodiment 3

[0033] The volume ratio of the carbonyl iron powder in the magnetorheological fluid is 35%, and the volume ratio of the carrier liquid is 65%.

[0034] The first step is to weigh 273g of carbonyl iron powder, 65g of silicone oil, and 3g of polyvinylpyrrolidone, and add them to a 200ml polytetrafluoroethylene beaker, stir them evenly with a glass rod, then mix them with a stirrer at a speed of 600rpm for 5 minutes, and then use The mixer was mixed at a speed of 1000rpm for 3 minutes to obtain a uniform magnetorheological fluid with good suspension;

[0035] In the second step, the magnetorheological fluid prepared in the first step is packed into a 150ml plastic bottle with a cover and tightly sealed;

[0036] In the third step, the plastic bottle containing the magnetorheological fluid obtained in the second step is placed in a magnetic field whose size can be adjusted, and the magnetic field strength is adjusted to 40mT;

[0037] The fourth step is to take the magnetorheolog...

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Abstract

The invention relates to a method for avoiding the deposition and agglomeration when stably storing the magnetic flow variable liquid. The invention uses the theory that the magnetic flow variable liquid can fix the magnetic particle inside the carrier liquid as basic liquid to form similar solid under he magnetic field; processing additional magnetic field on the magnetic flow variable liquid to avoid the separation between the magnetic particles and carrier liquid inside the magnetic flow variable liquid to avoid the deposition and agglomeration. The invention can avoid complex device and adding preparing cost.

Description

technical field [0001] The invention relates to a method for preventing magnetorheological fluid from settling and agglomerating when standing still. Background technique [0002] Magneto-rheological fluid is a new type of smart material invented by Robinow in 1948. It can change from a flowing liquid to a solid-like liquid instantly by using an external magnetic field. Its viscosity can change by several orders of magnitude, and this change is reversible. It can be precisely controlled, so this characteristic can be used to prepare various precise controllers, such as magnetorheological dampers, magnetorheological clutches, magnetorheological brakes, magnetorheological polishers, etc., which are used in earthquake resistance, Vibration and noise reduction of motor vehicles, sealing of chemical machinery, precision polishing of optical glass and precision machinery, etc. Its potential application market is huge. [0003] Magnetorheological fluid is a suspension composed of...

Claims

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Application Information

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IPC IPC(8): H01F1/44B01F3/12
Inventor 程海斌张清杰袁润章瞿伟廉
Owner WUHAN UNIV OF TECH
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