CN108843791A - A kind of tandem type magnetic fluid sealing structure - Google Patents
A kind of tandem type magnetic fluid sealing structure Download PDFInfo
- Publication number
- CN108843791A CN108843791A CN201810915745.9A CN201810915745A CN108843791A CN 108843791 A CN108843791 A CN 108843791A CN 201810915745 A CN201810915745 A CN 201810915745A CN 108843791 A CN108843791 A CN 108843791A
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- China
- Prior art keywords
- magnetic
- type permanent
- pole shoe
- radial magnetizing
- magnetic clamp
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
A kind of tandem type magnetic fluid sealing structure, space between axis outer surface and inner walls is equipped with multiple first pole shoes, axial charging type permanent-magnetic clamp is folded between two neighboring first pole shoe, radial magnetizing type permanent-magnetic clamp is set in the inner headed face of each the first pole shoe, the second pole shoe is set in the inner headed face of each radial magnetizing type permanent-magnetic clamp, second pole shoe inner headed face is equipped with pole tooth, is marked with magnetic fluid between pole tooth and axis outer surface；The polarity of the magnetic pole of two neighboring radial magnetizing type permanent-magnetic clamp is opposite；In the magnetic loop that the first pole shoe that each radial magnetizing type permanent-magnetic clamp is respectively positioned on axial charging type permanent-magnetic clamp and its two sides is constituted, and the magnetic direction of radial magnetizing type permanent-magnetic clamp is identical as the magnetic loop direction where it.Invention increases magnetic field strength, voltage endurance capability enhancing is sealed, and by the saturation magnetization of magnetic fluid in incrementally different gap, so that the magnet fluid sealing in all gaps can play a role, ensure that the pressure-resistant performance of sealing.
Description
Technical field
The invention belongs to mechanical engineering sealing techniques, and in particular to a kind of tandem type magnetic fluid sealing structure.
Background technique
The magnetic fluid sealing structure for being currently used for axis reciprocating motion generally comprises the shell with hollow cavity, axis, axis and shell
Between permanent magnet and pole shoe are set carry out magnet fluid sealing, pole shoe inner ring is equipped with pole tooth.
There are two types of the method for raising magnetic fluid seal pressure resistance performance is general：First, it tries every possible means to improve magnetic field strength；The
Two, increase the saturation magnetization of magnetic fluid.Most of starting points are all to go to consider from improving magnetic field strength, but existing magnetic current
Body sealing performance still has the space further increased.
Inventor tests discovery from high-pressure side to low-pressure side, in two neighboring pole shoe, if high-pressure side pole shoe magnet fluid sealing
When voltage endurance capability is greater than adjacent low-pressure side magnet fluid sealing voltage endurance capability, low-pressure side magnet fluid sealing can not work, that is,
Say that the sealing of low-pressure side is performed practically no function.For Multi-level sealing structure, since the magnet fluid sealing of low-pressure side can not play work
With wasting more costs then the pole shoe that excessive series is arranged only will increase the volume of magnetic fluid sealing structure.
Summary of the invention
In view of the above-mentioned problems, the present invention is intended to provide a kind of tandem type magnetic fluid sealing structure that sealing voltage endurance capability is strong.
The technical solution that the present invention solves the problems, such as is：A kind of tandem type magnetic fluid sealing structure, including hollow shell, institute
State shell is closed at one end, the other end open wide, be provided with through-hole at the closed end center of shell, further include being worn from through-hole to shell
The axis of inner cavity, it is axially spaced in the space between axis outer surface and inner walls to be equipped with multiple first pole shoes, described first
Pole shoe is ring-type, and the first pole shoe periphery is abutted with inner walls, is folded with axial charging type between two neighboring first pole shoe
Permanent-magnetic clamp, the polarity of the magnetic pole of two neighboring axial charging type permanent-magnetic clamp is on the contrary, the inner headed face in each the first pole shoe is set with
There is radial magnetizing type permanent-magnetic clamp, is set with the second pole shoe in the inner headed face of each radial magnetizing type permanent-magnetic clamp, the second pole shoe is
Ring-type, the second pole shoe inner headed face are equipped with pole tooth, and there are gap between pole tooth and axis outer surface, gap location is marked with magnetic fluid；
The polarity of the magnetic pole of two neighboring radial magnetizing type permanent-magnetic clamp is opposite；
Each radial magnetizing type permanent-magnetic clamp is respectively positioned on the magnetic that the first pole shoe of axial charging type permanent-magnetic clamp and its two sides is constituted
In circuit, and the magnetic direction of radial magnetizing type permanent-magnetic clamp is identical as the magnetic loop direction where it.
In above scheme, pass through two the first pole shoes, two radial magnetizing type permanent-magnetic clamps, an axial charging type permanent magnetism
Ring, two the second pole shoes and axis collectively constitute a magnetic loop unit, there is multiple such magnetic loops in entire sealing structure
Unit.For compared with the existing technology, two radial magnetizing type permanent-magnetic clamps, magnetic field strength are increased in each magnetic loop unit
Increase, sealing voltage endurance capability enhancing.Further, in order to enable sealing effect improves, the second pole shoe is set, by certain journey
The pole number of teeth amount for increasing the second pole shoe under degree, can enhance sealability.
Although above scheme is greatly improved to sealing voltage endurance capability from the angle of magnetic field strength, it still is possible to deposit
It is resistance to that high-pressure side the first pole shoe magnet fluid sealing voltage endurance capability stated in the background is greater than adjacent low-pressure side magnet fluid sealing
, there is such case low-pressure side magnet fluid sealing and does not still work in the case where pressure energy power.
Further, from high-pressure side to low pressure side direction, the saturation magnetization for the magnetic fluid infused in the gap of everywhere
It is incremented by successively.
Above-mentioned further improved scheme just solves the problems, such as that low-pressure side magnet fluid sealing does not work.By being incremented by not
With the saturation magnetization of magnetic fluid in gap, magnetic field strength successively enhances in gap, and magnet fluid sealing ability also successively enhances,
High-pressure side magnet fluid sealing ability is artificially produced less than low-pressure side magnet fluid sealing ability, it is ensured that background technique do not occur
The defect situation ensure that the pressure-resistant performance of sealing, increase so that the magnet fluid sealing in all gaps can play a role
Secondary bearing capacity and self-reparing capability are added.
Preferably, the increment of the saturation magnetization for the magnetic fluid infused is 1~3KA/m.
Specifically, being equipped with groove on the periphery of each the second pole shoe, the radial magnetizing type permanent-magnetic clamp is caught in it
Limit is fixed in the groove of the second corresponding pole shoe.
The radial magnetizing type permanent-magnetic clamp is split-type structure.
Magnetism-isolating loop is equipped between that first pole shoe and housings close end inner wall at housings close end；
That first pole shoe near shell open end is sealed in housing cavity by end cap compression；
Positive stop lug boss is equipped in the side of the inner headed face of each the first pole shoe；
Near a side end face and the positive stop lug boss of corresponding first pole shoe of that radial magnetizing type permanent-magnetic clamp at housings close end
It abuts, another side end face abuts limit with magnetism-isolating loop；
Near a side end face and the positive stop lug boss of corresponding first pole shoe of that radial magnetizing type permanent-magnetic clamp of shell open end
It abuts, another side end face abuts limit with end cap；
It is located most closely to the radial magnetizing type permanent-magnetic clamp at housings close end and the radial magnetizing type permanent magnetism near shell open end
The positive stop lug boss of one side end face of other each radial magnetizing type permanent-magnetic clamps between ring and corresponding first pole shoe abuts, another side
Face abuts limit with the end face of axial charging type permanent-magnetic clamp.
Preferably, the quantity of the axial charging type permanent-magnetic clamp is 2~10, and the quantity of radial magnetizing type permanent-magnetic clamp compares axis
To the type permanent-magnetic clamp that magnetizes quantity more than 1, the quantity of the first pole shoe and the second pole shoe than axial charging type permanent-magnetic clamp quantity more than 1
It is a.
Further, the gap size between radial magnetizing type permanent-magnetic clamp and axis outer surface is 0.05~5mm.
Preferably, the pole number of teeth amount of second pole shoe is 3~10.
The present invention sets about improving the performance of magnet fluid sealing in terms of two.
First, by the variation of structure, increase magnetic field strength, sealing voltage endurance capability enhancing.
Second, by the saturation magnetization of magnetic fluid in incrementally different gap, magnetic field strength successively enhances in gap, magnetic
Fluid Sealing ability also successively enhances, and artificially produces high-pressure side magnet fluid sealing ability less than low-pressure side magnet fluid sealing energy
Power ensure that the pressure-resistant performance of sealing, increase secondary pressure-bearing so that the magnet fluid sealing in all gaps can play a role
Ability and self-reparing capability.
Two aspect collective effects, complement each other, strengthen sealing voltage endurance capability jointly.
Detailed description of the invention
The present invention will be further explained below with reference to the attached drawings.
Fig. 1 is magnetic fluid sealing structure schematic diagram of the present invention.
In figure：1- axis, 2- shell, the first pole shoe of 3-, 4- end cap, 5- magnetism-isolating loop, the pole 6- tooth, 7- axial charging type permanent magnetism
Ring, 8- radial magnetizing type permanent-magnetic clamp, the second pole shoe of 9-, 31- positive stop lug boss.
Specific embodiment
As shown in Figure 1, a kind of tandem type magnetic fluid sealing structure, including hollow shell 2, the shell 2 is closed at one end,
The other end opens wide.It is provided with through-hole at the closed end center of shell 2, further includes being worn from through-hole to the axis 1 of 2 inner cavity of shell.
It is axially spaced in space between 2 inner wall of 1 outer surface of axis and shell to be equipped with multiple first pole shoes 3.Described
One pole shoe 3 is ring-type.First pole shoe, 3 periphery is abutted with 2 inner wall of shell.
Axial charging type permanent-magnetic clamp 7 is folded between two neighboring first pole shoe 3.Two neighboring axial charging type permanent-magnetic clamp
The polarity of 7 magnetic pole is opposite.
Radial magnetizing type permanent-magnetic clamp 8 is set in the inner headed face of each the first pole shoe 3.Each radial magnetizing type forever
The inner headed face of magnet ring 8 is set with the second pole shoe 9.Second pole shoe 9 is ring-type.Second pole shoe, 9 inner headed face is equipped with pole tooth 6.It is described
6 quantity of pole tooth of second pole shoe 9 is 3~10.
Groove is equipped on the periphery of each the second pole shoe 9.The radial magnetizing type permanent-magnetic clamp 8 is split-type knot
Structure.The radial magnetizing type permanent-magnetic clamp 8 is caught in limit in the groove of the second pole shoe 9 corresponding to it and fixes.
There are gaps between 1 outer surface of pole tooth 6 and axis.Gap size is 0.05~5mm.Gap location is marked with magnetic fluid.From
To low pressure side direction, the saturation magnetization for the magnetic fluid infused in the gap of everywhere is incremented by successively for high-pressure side.The magnetic current infused
The increment of the saturation magnetization of body is 1~3KA/m.
The polarity of the magnetic pole of two neighboring radial magnetizing type permanent-magnetic clamp 8 is opposite.
Each radial magnetizing type permanent-magnetic clamp 8 is respectively positioned on 3 structures of the first pole shoe of axial charging type permanent-magnetic clamp 7 Yu its two sides
At magnetic loop in, and the magnetic direction of radial magnetizing type permanent-magnetic clamp 8 is identical as the magnetic loop direction where it.
Magnetism-isolating loop 5 is equipped between the 2 closed end inner wall of that first pole shoe 3 and shell of 2 closed end of shell.
That first pole shoe 3 near 2 open end of shell is sealed in 2 inner cavity of shell by the compression of end cap 4.
Positive stop lug boss 31 is equipped in the side of the inner headed face of each the first pole shoe 3.
The suit mode of radial magnetizing type permanent-magnetic clamp 8 is：
Near a side end face and the limit convex of corresponding first pole shoe 3 of that radial magnetizing type permanent-magnetic clamp 8 of 2 closed end of shell
The abutting of platform 31, another side end face abut limit with magnetism-isolating loop 5.
Near a side end face and the limit of corresponding first pole shoe 3 of that radial magnetizing type permanent-magnetic clamp 8 of 2 open end of shell
The position abutting of boss 31, another side end face abut limit with end cap 4.
It is located most closely to the radial magnetizing type permanent-magnetic clamp 8 of 2 closed end of shell and the radial magnetizing near 2 open end of shell
One side end face of other each radial magnetizing type permanent-magnetic clamps 8 between type permanent-magnetic clamp 8 is supported with the positive stop lug boss 31 of corresponding first pole shoe 3
It connects, another side end face with the end face of axial charging type permanent-magnetic clamp 7 abuts limit.
The quantity of the axial charging type permanent-magnetic clamp 7 is 2~10.The quantity of radial magnetizing type permanent-magnetic clamp 8 is filled than axial
The quantity of magnetic-type permanent-magnetic clamp 7 is 1 more.The quantity of first pole shoe 3 and the second pole shoe 9 than axial charging type permanent-magnetic clamp 7 quantity more than 1
It is a.
Claims (9)
1. a kind of tandem type magnetic fluid sealing structure, including hollow shell（2）, the shell（2）The closed at one end, other end opens
It opens, in shell（2）Closed end center be provided with through-hole, further include being worn from through-hole to shell（2）The axis of inner cavity（1）, in axis
（1）Outer surface and shell（2）It is axially spaced in space between inner wall to be equipped with multiple first pole shoes（3）, first pole shoe
（3）For ring-type, the first pole shoe（3）Periphery and shell（2）Inner wall abuts, two neighboring first pole shoe（3）Between be folded with axis
To the type permanent-magnetic clamp that magnetizes（7）, two neighboring axial charging type permanent-magnetic clamp（7）Magnetic pole polarity it is opposite, it is characterised in that：Every
One the first pole shoe（3）Inner headed face be set with radial magnetizing type permanent-magnetic clamp（8）, in each radial magnetizing type permanent-magnetic clamp（8）
Inner headed face be set with the second pole shoe（9）, the second pole shoe（9）For ring-type, the second pole shoe（9）Inner headed face is equipped with pole tooth（6）, pole
Tooth（6）With axis（1）There are gap between outer surface, gap location is marked with magnetic fluid；
Two neighboring radial magnetizing type permanent-magnetic clamp（8）Magnetic pole polarity it is opposite；
Each radial magnetizing type permanent-magnetic clamp（8）It is respectively positioned on axial charging type permanent-magnetic clamp（7）With the first pole shoe of its two sides（3）Institute
In the magnetic loop of composition, and radial magnetizing type permanent-magnetic clamp（8）Magnetic direction it is identical as the magnetic loop direction where it.
2. tandem type magnetic fluid sealing structure according to claim 1, it is characterised in that：From high-pressure side to low pressure side
To the saturation magnetization for the magnetic fluid infused in the gap of everywhere is incremented by successively.
3. tandem type magnetic fluid sealing structure according to claim 2, it is characterised in that：The saturation magnetic for the magnetic fluid infused
The increment for changing intensity is 1~3KA/m.
4. tandem type magnetic fluid sealing structure according to claim 1, it is characterised in that：In each the second pole shoe（9）
Periphery be equipped with groove, the radial magnetizing type permanent-magnetic clamp（8）It is caught in the second pole shoe corresponding to it（9）Groove in limit
Position is fixed.
5. tandem type magnetic fluid sealing structure according to claim 4, it is characterised in that：The radial magnetizing type permanent-magnetic clamp
（8）For split-type structure.
6. tandem type magnetic fluid sealing structure according to claim 4 or 5, it is characterised in that：Near shell（2）Closing
That first pole shoe at end（3）With shell（2）Magnetism-isolating loop is equipped between the inner wall of closed end（5）；
Near shell（2）That first pole shoe of open end（3）Pass through end cap（4）Compression is sealed in shell（2）Inner cavity；
In each the first pole shoe（3）Inner headed face side be equipped with positive stop lug boss（31）；
Near shell（2）That radial magnetizing type permanent-magnetic clamp of closed end（8）A side end face and corresponding first pole shoe（3）'s
Positive stop lug boss（31）Abutting, another side end face and magnetism-isolating loop（5）Abut limit；
Near shell（2）That radial magnetizing type permanent-magnetic clamp of open end（8）A side end face and corresponding first pole shoe（3）'s
Positive stop lug boss（31）Abutting, another side end face and end cap（4）Abut limit；
It is located most closely to shell（2）The radial magnetizing type permanent-magnetic clamp of closed end（8）With near shell（2）The radial direction of open end is filled
Magnetic-type permanent-magnetic clamp（8）Between other each radial magnetizing type permanent-magnetic clamps（8）A side end face and corresponding first pole shoe（3）Limit
Boss（31）Abutting, another side end face and axial charging type permanent-magnetic clamp（7）End face abut limit.
7. tandem type magnetic fluid sealing structure according to claim 1, it is characterised in that：The axial charging type permanent-magnetic clamp
（7）Quantity be 2~10, radial magnetizing type permanent-magnetic clamp（8）Quantity than axial charging type permanent-magnetic clamp（7）Quantity more 1,
First pole shoe（3）With the second pole shoe（9）Quantity than axial charging type permanent-magnetic clamp（7）Quantity more 1.
8. tandem type magnetic fluid sealing structure according to claim 1, it is characterised in that：Radial magnetizing type permanent-magnetic clamp（8）
With axis（1）Gap size between outer surface is 0.05~5mm.
9. tandem type magnetic fluid sealing structure according to claim 1, it is characterised in that：Second pole shoe（9）Pole
Tooth（6）Quantity is 3~10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810915745.9A CN108843791B (en) | 2018-08-13 | 2018-08-13 | Tandem type magnetic fluid sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810915745.9A CN108843791B (en) | 2018-08-13 | 2018-08-13 | Tandem type magnetic fluid sealing structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108843791A true CN108843791A (en) | 2018-11-20 |
| CN108843791B CN108843791B (en) | 2020-01-21 |
Family
ID=64193096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810915745.9A Active CN108843791B (en) | 2018-08-13 | 2018-08-13 | Tandem type magnetic fluid sealing structure |
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| Country | Link |
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| CN (1) | CN108843791B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112431928A (en) * | 2020-11-25 | 2021-03-02 | 清华大学 | Magnetic liquid sealing device |
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| JPH01220776A (en) * | 1988-02-25 | 1989-09-04 | Nok Corp | Magnetic fluid sealing device |
| SU1737201A1 (en) * | 1990-01-10 | 1992-05-30 | Научно-Технический Производственный Кооператив "Контракт" | Magnetic-liquid seal |
| JPH05196149A (en) * | 1992-01-21 | 1993-08-06 | Tokyo Electron Ltd | Magnetic fluid seal device |
| US7129609B1 (en) * | 2005-08-30 | 2006-10-31 | Ferrolabs, Inc. | Magneto-fluidic seal with wide working temperature range |
| CN101055037A (en) * | 2007-04-29 | 2007-10-17 | 浙江工业大学 | Magnetofluid seal driving device for vacuum equipment driving shaft |
| KR20100119149A (en) * | 2009-04-30 | 2010-11-09 | 주식회사 에스비비테크 | Shaft speed-responsible magnentic sealing spindle structure |
| CN107906207A (en) * | 2017-12-13 | 2018-04-13 | 广西科技大学 | A kind of series parallel type device for sealing magnetic fluid |
| CN107956880A (en) * | 2017-12-13 | 2018-04-24 | 广西科技大学 | A kind of magnetic fluid sealing structure |
| CN108006230A (en) * | 2017-12-13 | 2018-05-08 | 广西科技大学 | A kind of hybrid magnetic fluid seal apparatus |
-
2018
- 2018-08-13 CN CN201810915745.9A patent/CN108843791B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01220776A (en) * | 1988-02-25 | 1989-09-04 | Nok Corp | Magnetic fluid sealing device |
| SU1737201A1 (en) * | 1990-01-10 | 1992-05-30 | Научно-Технический Производственный Кооператив "Контракт" | Magnetic-liquid seal |
| JPH05196149A (en) * | 1992-01-21 | 1993-08-06 | Tokyo Electron Ltd | Magnetic fluid seal device |
| US7129609B1 (en) * | 2005-08-30 | 2006-10-31 | Ferrolabs, Inc. | Magneto-fluidic seal with wide working temperature range |
| CN101055037A (en) * | 2007-04-29 | 2007-10-17 | 浙江工业大学 | Magnetofluid seal driving device for vacuum equipment driving shaft |
| KR20100119149A (en) * | 2009-04-30 | 2010-11-09 | 주식회사 에스비비테크 | Shaft speed-responsible magnentic sealing spindle structure |
| CN107906207A (en) * | 2017-12-13 | 2018-04-13 | 广西科技大学 | A kind of series parallel type device for sealing magnetic fluid |
| CN107956880A (en) * | 2017-12-13 | 2018-04-24 | 广西科技大学 | A kind of magnetic fluid sealing structure |
| CN108006230A (en) * | 2017-12-13 | 2018-05-08 | 广西科技大学 | A kind of hybrid magnetic fluid seal apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112431928A (en) * | 2020-11-25 | 2021-03-02 | 清华大学 | Magnetic liquid sealing device |
| CN112431928B (en) * | 2020-11-25 | 2022-09-23 | 清华大学 | Magnetic liquid sealing device |
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| CN108843791B (en) | 2020-01-21 |
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