CN103762056A - Magnetic liquid seal method with high rotation speed resisting capability - Google Patents
Magnetic liquid seal method with high rotation speed resisting capability Download PDFInfo
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- CN103762056A CN103762056A CN201410022855.4A CN201410022855A CN103762056A CN 103762056 A CN103762056 A CN 103762056A CN 201410022855 A CN201410022855 A CN 201410022855A CN 103762056 A CN103762056 A CN 103762056A
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- magnetic liquid
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Abstract
The invention discloses a magnetic liquid seal method with high rotation speed resisting capability and belongs to the technical field of mechanical engineering seal. The method is especially suitable magnetic fluid seal. The magnetic liquid is prepared by adding 1-10 nanometers of copper powder or silver powder accounting for 1-25% of the volume of the magnetic liquid into the existing magnetic liquid and stirring for 50-60 minutes. The copper power and the silver power are wrapped by surfactants such oleic acid, linoleic acid and fluorine ether ester during preparation. The existing magnetic liquid includes all magnetic liquid such as water-based magnetic liquid, engine oil-based magnetic liquid, silicone oil-based magnetic liquid, kerosene-based magnetic liquid, diester-based magnetic liquid and desflurane oil-based magnetic liquid. By the method, the problem that a large amount of heat is gathered in the seal gap of the existing magnetic liquid seal device due to high rotation speed, the magnetic liquid loses efficacy, and the pressure resistance of the magnetic liquid seal device is lowered.
Description
Technical field
The invention belongs to mechanical engineering technical field of sealing technology, be specially adapted to magnetic fluid sealing.
Background technology
In magnetic fluid seal device, the seal clearance that the pole shoe being usually directed to and rotating shaft form is between 0.1mm～0.2mm.Under magnetic fields, magnetic liquid is filled in seal clearance.Now, the nano-level iron magnetic-particle in magnetic liquid can steady in a long-termly suspend, and is dispersed in uniformly in base load liquid, makes sealing device have good voltage endurance capability.
But under large-diameter, high-revolving working condition, in seal clearance, can assemble amount of heat.This just requires magnetic liquid to have stronger heat-resisting ability, the problem that the magnetic fluid seal device voltage endurance capability causing to avoid Yin Wendu rising that magnetic liquid was lost efficacy reduces.
Summary of the invention
Technical problem to be solved by this invention is: under large-diameter, high-revolving working condition, in seal clearance, can assemble amount of heat, unit temp is sharply raise, cause the inefficacy of magnetic liquid, cause the decline of magnetic fluid seal device voltage endurance capability.
The technical solution adopted for the present invention to solve the technical problems is:
In magnetic liquid, adding volume is copper powder or the silver powder of the 1nm～10nm of magnetic liquid volume 1%～25%, stirs 50～60 minutes.Copper powder or silver powder are coated with surfactant in preparation process, as oleic acid, linoleic acid, fluorine ether-ether etc., magnetic liquid comprises all magnetic liquids, as water-base magnetic liquid, machine oil based magnetic liquid, Polydimethylsiloxane--based Ferrofluids, Kerosene-Base Magnetic Fluid, diester based magnetic liquid, fluorine ether oil based magnetic liquid etc.In non-uniform magnetic field environment, according to the law of buoyancy of magnetic liquid, non-magnetic particle can not be stablized and is distributed in magnetic liquid, therefore by copper powder or the silver powder of 1nm～10nm level are coated with surfactant, copper powder or the silver powder stability in magnetic liquid is increased, can be dispersed in magnetic liquid.Because copper powder or silver powder have good conduction heat transfer ability, so nanoscale copper powder or the silver powder of stable suspersion in magnetic liquid can be taken away a large amount of heats, thereby reduced the temperature of the magnetic liquid in seal clearance, effectively prevented magnetic liquid Yin Gaowen and the evaporation that causes.
Beneficial effect of the present invention:
Because the present invention adds the copper powder of the 1nm～10nm of magnetic liquid volume 1%～25% or silver powder in magnetic liquid, under the effect of externally-applied magnetic field, additional copper powder or silver powder can long-term stability be suspended in magnetic liquid.Because copper powder or silver powder have good conduction heat transfer ability, so nanoscale copper powder or the silver powder of stable suspersion in magnetic liquid can be taken away a large amount of heats, thereby reduced the temperature of the magnetic liquid in seal clearance, effectively prevented magnetic liquid Yin Gaowen and the evaporation that causes.Therefore,, at the copper powder that adds particle diameter in magnetic liquid between 1nm～10nm or silver powder for magnetic fluid sealing, can prevent the problem reducing because of magnetic fluid seal device voltage endurance capability that excess Temperature lost efficacy magnetic liquid to cause.
Accompanying drawing explanation
Fig. 1 be add copper powder or silver powder before, the state of the magnetic liquid in seal clearance under magnetic fields.
Fig. 2 be add copper powder or silver powder after, the state of the magnetic liquid in seal clearance under magnetic fields.
In figure: utmost point tooth 1, magnetic liquid 2, rotating shaft 3, copper powder or silver powder 4.
Embodiment
Execution mode one
In magnetic liquid, adding volume is the copper powder of the 1nm of magnetic liquid volume 5%, stirs 50 minutes.
Execution mode two
In magnetic liquid, adding volume is the copper powder of the 5nm of magnetic liquid volume 10%, stirs 55 minutes.
Execution mode three
In magnetic liquid, adding volume is the silver powder of the 10nm of magnetic liquid volume 20%, stirs 60 minutes.
Q=FS?Q=AλΔt/δ
In formula: Q is heat, F is frictional force size, and S is the relative distance occurring between object, and A is heat-conducting area, and λ is conductive coefficient, and Δ t is temperature difference, δ heat conduction thickness.
Known, accelerating heat conduction approach is mainly to change λ, increases λ conductive coefficient, shows as and selects the large material of conductive coefficient.
Use-case: the rotating shaft that is 50mm to diameter under normal temperature carries out magnetic fluid sealing, magnetic liquid is Kerosene-Base Magnetic Fluid, surfactant is selected oleic acid, permanent magnet is selected NdFeB material, adding volume is magnetic liquid volume 10%, particle diameter is the copper powder of 10nm, and sealing speed capability has improved 40%.
Claims (1)
1. a magnetic fluid sealing method for resistance to high speed capability, is characterized in that:
The copper powder or the silver powder that in magnetic liquid, add particle diameter 1nm～10nm, stir 50～60 minutes;
Described copper powder or silver powder are coated with surfactant in preparation process, as oleic acid, linoleic acid, fluorine ether-ether etc., even if make in the situation that there is magnetic field gradient, copper powder or silver powder still can be dispersed in magnetic liquid, and the magnetic liquid capacity of heat transmission is strengthened, thereby make the magnetic fluid sealing can resistance to high rotating speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410022855.4A CN103762056A (en) | 2014-01-17 | 2014-01-17 | Magnetic liquid seal method with high rotation speed resisting capability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410022855.4A CN103762056A (en) | 2014-01-17 | 2014-01-17 | Magnetic liquid seal method with high rotation speed resisting capability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103762056A true CN103762056A (en) | 2014-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410022855.4A Pending CN103762056A (en) | 2014-01-17 | 2014-01-17 | Magnetic liquid seal method with high rotation speed resisting capability |
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| CN (1) | CN103762056A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104141796A (en) * | 2014-07-04 | 2014-11-12 | 北京交通大学 | Method for increasing sealing and pressure resisting capacity of magnetic liquid by using magnetoconductivity nanowire magnetic liquid |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1329123A (en) * | 2000-06-15 | 2002-01-02 | 南京理工大学 | Nanometer fluid high-effective heat-conductive cooling working medium and its preparation method |
| WO2004086426A1 (en) * | 2003-03-28 | 2004-10-07 | Ferrotec Corporation | Magnetic fluid having an improved chemical stability and process for preparing the same |
| CN101735775A (en) * | 2010-01-26 | 2010-06-16 | 上海第二工业大学 | Method for preparing nano fluid for heat transfer medium of solar heat exchange system |
-
2014
- 2014-01-17 CN CN201410022855.4A patent/CN103762056A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1329123A (en) * | 2000-06-15 | 2002-01-02 | 南京理工大学 | Nanometer fluid high-effective heat-conductive cooling working medium and its preparation method |
| WO2004086426A1 (en) * | 2003-03-28 | 2004-10-07 | Ferrotec Corporation | Magnetic fluid having an improved chemical stability and process for preparing the same |
| CN101735775A (en) * | 2010-01-26 | 2010-06-16 | 上海第二工业大学 | Method for preparing nano fluid for heat transfer medium of solar heat exchange system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104141796A (en) * | 2014-07-04 | 2014-11-12 | 北京交通大学 | Method for increasing sealing and pressure resisting capacity of magnetic liquid by using magnetoconductivity nanowire magnetic liquid |
| CN104141796B (en) * | 2014-07-04 | 2016-02-10 | 北京交通大学 | The method of magnetic fluid sealing voltage endurance capability is improved with magnetic conductivity nanowire magnetic liquid |
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Application publication date: 20140430 |