CN103542099A - Magnetic liquid with improved sealing pressure bearing capacity - Google Patents
Magnetic liquid with improved sealing pressure bearing capacity Download PDFInfo
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- CN103542099A CN103542099A CN201310465753.5A CN201310465753A CN103542099A CN 103542099 A CN103542099 A CN 103542099A CN 201310465753 A CN201310465753 A CN 201310465753A CN 103542099 A CN103542099 A CN 103542099A
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Abstract
The invention discloses magnetic liquid with the improved sealing pressure bearing capacity, and belongs to the technical field of mechanical engineering sealing. The magnetic liquid with the improved sealing pressure bearing capacity is particularly suitable for magnetic liquid sealing. The magnetic liquid is characterized in that 60-80-micrometer non-magnetic solid particles with the volume 5%-7% of the volume of existing magnetic liquid are added into the existing magnetic liquid, a proper number of fluorocarbon surface active agents are added, and stirring is carried out for forty to fifth minutes. The non-magnetic solid particles comprise silicon oxide powder or aluminum oxide powder. The existing magnetic liquid comprises double-aliphatic-base magnetic liquid or kerosene-base magnetic liquid. The problem that the pressure bearing capacity of the existing magnetic liquid is lowered due to the fact that magnetic solid particles in the existing magnetic liquid are unevenly distributed is solved.
Description
Technical field
The invention belongs to mechanical engineering technical field of sealing technology, be specially adapted to magnetic fluid sealing.
Background technique
In magnetic fluid seal device, the seal clearance that the pole shoe being usually directed to and axle form is between 0.1mm～0.2mm.Under magnetic fields, magnetic liquid is filled in seal clearance.Now, the ferromagnetic particle of the nanometer scale in magnetic liquid can steady in a long-termly suspend, and is dispersed in uniformly in base load liquid, makes seal arrangement have good voltage endurance capability.
But in some special devices, the rotating speed of rotating shaft turns up to per minute several ten thousand, therefore, also just inevitably with slight radial vibration, this just requires the larger gap that has between rotating shaft and utmost point tooth, to avoid because of the vibration of rotating shaft, utmost point tooth being destroyed.When seal clearance requires to be greater than 0.5mm(, be generally less than 1mm) time, nano-scale magnetic particle in magnetic liquid is under the effect of non-uniform magnetic-field, can in the high region of magnetic intensity, produce and assemble along with the variation of magnetic field gradient, be that magnetic-particle quantity in the region that per unit volume internal magnetic field intensity is high is greater than the magnetic-particle quantity in the region that magnetic intensity is low, cause magnetic liquid internal magnetization particle size distribution inhomogeneous, the whole voltage endurance capability of magnetic liquid is declined, and along with the increase of seal clearance, segregation phenomenon is more obvious.Cause the voltage endurance capability of magnetic fluid seal device greatly to reduce.
Summary of the invention
Technical problem to be solved by this invention is: in magnetic fluid seal device, the seal clearance of pole shoe and axle is greater than 0.5mm(and is generally less than 1mm) time, the ferromagnetism solid particle of the nanometer scale in magnetic liquid segregation under non-uniform magnetic-field effect, cause magnetic retention particle size distribution inhomogeneous, cause magnetic liquid voltage endurance capability to decline.
Technological scheme of the present invention:
Improve the magnetic liquid of magnetic fluid sealing voltage endurance capability, this magnetic liquid is that in magnetic liquid, to add volume be the non magnetic solid particle of 60 μ m～80 μ m of magnetic liquid volume 5%～7%, and add fluorocarbons surface active agent to prevent the non magnetic solid particle precipitation of micron order, stir 40 to 50 minutes.
Described non magnetic solid particle comprises silicon oxide powder or alumina powder.
Magnetic liquid comprises two fat based magnetic liquid or Kerosene-Base Magnetic Fluids.
Beneficial effect of the present invention:
Because the present invention is that to add volume in magnetic liquid be silica or the alumina powder between 60 μ m～80 μ m of magnetic liquid volume 5%～7%, under fluorocarbons Action of Surfactant, additional non magnetic solid particle can long-term stability be suspended in magnetic liquid.The micron-sized non magnetic solid particle of stable suspersion in magnetic liquid, hindered the motion that in magnetic liquid, nano level ferromagnetism solid particle causes due to non-uniform magnetic-field effect, reduce the segregation of nano-solid particle, effectively improved the distribution of solid particle in magnetic liquid.Therefore, do not affecting under the prerequisite of magnetic fluid sealing performance, adding the non magnetic solid particle between 60 μ m～80 μ m, preventing the seal arrangement Problem of Failure that causes voltage endurance capability to decline and cause because of nano-scale magnetic particle segregation.In addition, the non magnetic solid particle of micron order is compared with magnetic liquid, and preparation process is relatively simple, therefore uses magnetic liquid cost of the present invention low.
Accompanying drawing explanation
Fig. 1 is the front utmost point tooth magnetic liquid internal magnetic field intensity distribution of pressurization while not adding non-magnetic particle.
Fig. 2 adds after non-magnetic particle utmost point tooth magnetic liquid internal magnetic field intensity distribution before pressurization.
Fig. 3 is the rear utmost point tooth magnetic liquid internal magnetic field intensity distribution of pressurization while not adding non-magnetic particle.
Fig. 4 adds after non-magnetic particle utmost point tooth magnetic liquid internal magnetic field intensity distribution after pressurization.
In figure: utmost point tooth 1, magnetic liquid 2, rotating shaft 3, non magnetic solid particle 4.
Embodiment
Mode of execution one
In the two fat based magnetic liquids that come in buying, adding volume is the non magnetic solid particle silicon oxide powder of 80 μ m of magnetic liquid volume 5%, and adds appropriate fluorocarbons surface active agent, stirs 40 minutes.
Mode of execution two
In the two fat based magnetic liquids that come in buying, adding volume is the non magnetic solid particle alumina powder of 70 μ m of magnetic liquid volume 6%, and adds appropriate fluorocarbons surface active agent, stirs 45 minutes.
Mode of execution three
In the Kerosene-Base Magnetic Fluid coming in buying, adding volume is the non magnetic solid particle alumina powder of 60 μ m of magnetic liquid volume 7%, and adds appropriate fluorocarbons surface active agent, stirs 50 minutes.
Add after non-magnetic particle, between utmost point tooth and rotating shaft, original Magnetic field distribution can change, as shown in accompanying drawing 1,2.After Sealing one side pressurization, the distribution in magnetic field is also different, under the effect of non-magnetic particle, can make axial magnetic field gradient strengthen, as shown in accompanying drawing 3,4.In accompanying drawing, utmost point tooth left side is that high pressure, ，Ji Chi right side, high magnetic field intensity district are low pressure, low magnetic field intensity district.So just improved whole voltage endurance capability.
Use-case: magnetic liquid is selected two fat base ferroferric oxide gels, permanent magnet is selected NdFeB material, adding volume is magnetic liquid volume 7%, be of a size of the silicon oxide powder of 60 μ m, and add appropriate fluorocarbons surface active agent, with the running shaft that is 30mm to diameter under this magnetic liquid normal temperature, carry out magnetic fluid sealing, seal clearance is 0.5mm, and sealing voltage endurance capability had improved 20% before adding non-magnetic particle.
Claims (1)
1. improve the magnetic liquid of magnetic fluid sealing voltage endurance capability, it is characterized in that:
In magnetic liquid, adding volume is the non magnetic solid particle of 60 μ m～80 μ m of magnetic liquid volume 5%～7%, and adds appropriate fluorocarbons surface active agent, to prevent the non magnetic solid particle precipitation of micron order, stirs 40 to 50 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310465753.5A CN103542099A (en) | 2013-10-09 | 2013-10-09 | Magnetic liquid with improved sealing pressure bearing capacity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310465753.5A CN103542099A (en) | 2013-10-09 | 2013-10-09 | Magnetic liquid with improved sealing pressure bearing capacity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103542099A true CN103542099A (en) | 2014-01-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310465753.5A Pending CN103542099A (en) | 2013-10-09 | 2013-10-09 | Magnetic liquid with improved sealing pressure bearing capacity |
Country Status (1)
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| CN (1) | CN103542099A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3990981A (en) * | 1974-08-23 | 1976-11-09 | International Business Machines Corporation | Water based magnetic inks and the manufacture thereof |
| CN1560209A (en) * | 2004-02-19 | 2005-01-05 | 上海交通大学 | Magnitic rheological liquid of guargum |
| CN1595558A (en) * | 2004-06-22 | 2005-03-16 | 上海大学 | A magnetic rheological fluid and preparing method thereof |
| CN1959871A (en) * | 2006-10-10 | 2007-05-09 | 武汉理工大学 | Stable water based magnetic rheologic liquid, and preparation method |
| CN102042412A (en) * | 2010-12-31 | 2011-05-04 | 北京交通大学 | Magnetic liquid for improving pressure resistance capability in case of magnetic liquid seal |
| CN102136334B (en) * | 2011-01-08 | 2012-09-05 | 北京交通大学 | Magnetic liquid applicable to large gap magnetic liquid sealing |
-
2013
- 2013-10-09 CN CN201310465753.5A patent/CN103542099A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3990981A (en) * | 1974-08-23 | 1976-11-09 | International Business Machines Corporation | Water based magnetic inks and the manufacture thereof |
| CN1560209A (en) * | 2004-02-19 | 2005-01-05 | 上海交通大学 | Magnitic rheological liquid of guargum |
| CN1595558A (en) * | 2004-06-22 | 2005-03-16 | 上海大学 | A magnetic rheological fluid and preparing method thereof |
| CN1959871A (en) * | 2006-10-10 | 2007-05-09 | 武汉理工大学 | Stable water based magnetic rheologic liquid, and preparation method |
| CN102042412A (en) * | 2010-12-31 | 2011-05-04 | 北京交通大学 | Magnetic liquid for improving pressure resistance capability in case of magnetic liquid seal |
| CN102136334B (en) * | 2011-01-08 | 2012-09-05 | 北京交通大学 | Magnetic liquid applicable to large gap magnetic liquid sealing |
Non-Patent Citations (1)
| Title |
|---|
| 吕建强: "纳米磁性液体制备及性能研究", 《中国优秀硕士学位论文全文数据库》 * |
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Application publication date: 20140129 |