CN108488390A - A kind of magnetic fluid sealing structure - Google Patents
A kind of magnetic fluid sealing structure Download PDFInfo
- Publication number
- CN108488390A CN108488390A CN201810141729.9A CN201810141729A CN108488390A CN 108488390 A CN108488390 A CN 108488390A CN 201810141729 A CN201810141729 A CN 201810141729A CN 108488390 A CN108488390 A CN 108488390A
- Authority
- CN
- China
- Prior art keywords
- magnetic fluid
- pole
- shaft
- bearing
- face
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- 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
Abstract
A kind of magnetic fluid sealing structure, including hollow shell, shaft are set at least one pole shoe in inner walls, and a wherein side end face for each pole shoe is equipped with pole tooth；It is set with ladder axle sleeve in shaft periphery, the numbers of steps of ladder axle sleeve is identical as pole tooth；Circumferential direction is provided with groove at every level-one step end face of ladder axle sleeve, is equipped with permanent magnet in groove, the polarity of the magnetic pole of two adjacent permanent magnets is opposite；Permanent magnet and pole tooth face one by one, and there are gaps, gap location to be marked with magnetic fluid between permanent magnet and the pole tooth of its face.The present invention uses the structure of radial seal, so that shaft is in the case where operating has bias, the change of seal clearance is influenced minimum, stable sealing can be still formed, moreover, permanent magnet and magnetic fluid directly act on, voltage endurance capability also enhances, again, radial seal so that magnetic circuit is shorter, and sealability and voltage endurance capability are stronger.Several respects reason acts synergistically, to improve the voltage endurance capability of device for sealing magnetic fluid entirety.
Description
Technical field
The invention belongs to sealing techniques, and in particular to a kind of magnetic fluid sealing structure.
Background technology
Magnet fluid sealing is with excellent without solid friction, long, the achievable zero leakage of seal durability etc. between sealing element
Point.
Existing magnetic fluid sealing structure generally comprises the shell with hollow cavity, shaft, is arranged forever between shaft and shell
Magnet and pole shoe carry out magnet fluid sealing, and pole shoe inner ring is equipped with pole tooth.
Existing structure sealing means are axial seal, and sealing station is located at shaft periphery, are primarily present following lack
It falls into：
It axially and radially beats 1. shaft has when rotating at high speed, so as to cause shaft bias, by high speed when axial seal
Rotation causes the influence of shaft bias, no matter upper inclined or lower inclined, can seal clearance be caused to change, once seal clearance changes
Become, then sealing performance and voltage endurance capability can be caused to decline, it is also possible to magnetic fluid be caused to leak.
2. the area segments for carrying out magnet fluid sealing are optical axis sections, once magnetic fluid leaks, can cause to leak completely,
Seal failure.
3. permanent magnet relatively far apart, causes the magnetic field at magnetic current body position is opposite to weaken at a distance from magnetic fluid.
4. the sealing station of existing Magneticfluid Seal Technique is associated with shaft generation, sealing station is happened at shaft
Periphery at, but if the axis of the not instead of conventional shape of the shaft used in actual demand, special-shaped axis, then just can not
It is sealed with existing magnetic fluid sealing structure.
Invention content
In view of the above-mentioned problems, the present invention is intended to provide a kind of magnet fluid sealing with high sealing performance and high voltage performance
Structure.
The technical solution that the present invention solves the problems, such as is：A kind of magnetic fluid sealing structure, including hollow shell, it is set to shell
The shaft of intracoelomic cavity, shaft, by bearing assembly connection, at least one pole shoe, each pole shoe are set in inner walls with shell
A wherein side end face be equipped with pole tooth；
It is set with ladder axle sleeve in shaft periphery, the numbers of steps of ladder axle sleeve is identical as pole tooth；In each of ladder axle sleeve
Circumferential direction is provided with groove at grade step end face, is equipped with permanent magnet in groove, the polarity of the magnetic pole of two adjacent permanent magnets is opposite；
The permanent magnet and pole tooth face one by one, and there are gaps, gap location to be marked with magnetic between permanent magnet and the pole tooth of its face
Fluid.
Said program forms the structure of radial seal using pole shoe structure stepped in the axial direction so that turns
Axis is in the case where operating has bias（It is either upper inclined or lower inclined）, the change of seal clearance is influenced it is minimum, still can be with
Form stable sealing.
Meanwhile permanent magnet and magnetic fluid directly act on, voltage endurance capability also enhances.
Again, radial seal so that magnetic circuit is shorter, and sealability and voltage endurance capability are stronger.
Preferably, it there are one the pole shoe is set, is set on pole shoe there are two pole tooth.
Preferably, the step series of the ladder axle sleeve is 2~10 grades.
Preferably, interstice coverage is 0.05~5mm.
Further, it is sealed by sealing ring between pole shoe periphery and inner walls.
Further, the shaft is multi-diameter shaft, and the bearing includes the first bearing abutted with the shoulder of shaft and the
Two bearings；Described housing cavity one end is equipped with stopper section, and first bearing other end is abutted with the stopper section, and second bearing passes through
End cap compression is sealed in housing cavity；The pole shoe is set between first bearing and second bearing.
Further, the first magnetism-isolating loop is equipped between the end face outside of pole shoe and first bearing and second bearing；
Be close to ladder axle sleeve close to permanent magnet that end face be equipped with the second magnetism-isolating loop.
The present invention remarkable result be：
1. using pole shoe structure stepped in the axial direction, the structure of radial seal is formed so that shaft has in operating
It is minimum on the change of seal clearance influence in the case of bias, stable sealing can be still formed, moreover, permanent magnet and magnetic
Fluid directly acts on, and voltage endurance capability also enhances, and again, radial seal so that magnetic circuit is shorter, and sealability and voltage endurance capability are more
By force.Several respects reason acts synergistically, to improve the voltage endurance capability of device for sealing magnetic fluid entirety.
2. ladder shaft design, once failure will not cause all magnetic fluids to leak entirely, is reduced due to there is ladder blocking
In the seal failure loss of magnetic fluid.
3. passing through the sealing station for shifting magnetic fluid, it is only necessary to design ladder axle sleeve according to the shape of shaft, the can
Enough reliable and stable is sleeved on the magnet fluid sealing that can be used to special-shaped shaft in shaft, and increase magnet fluid sealing applies model
It encloses.
Description of the drawings
The invention will be further described below in conjunction with the accompanying drawings.
Fig. 1 is sealing structure sectional view of the present invention.
In figure：1- shafts, 2- shells, 3- first bearings, the first magnetism-isolating loops of 4-, 5- pole shoes, 6- ladder axle sleeves, 7- steps,
8- magnetic fluids, 9- permanent magnets, 10- sealing rings, the poles 11- tooth, 12- second bearings, the stopper sections 13-, 14- end caps, 15- second is every magnetic
Ring.
Specific implementation mode
As shown in Figure 1, a kind of magnetic fluid sealing structure, including hollow shell 2, the shaft 1 for being set to 2 inner cavity of shell,
Shaft 1 passes through bearing assembly connection with shell 2.
In 2 inner wall sleeve of shell dress there are one pole shoe 5, set that there are two pole teeth 11 on a wherein side end face for pole shoe 5.Pole shoe 5
It is sealed by sealing ring 10 between 2 inner wall of periphery and shell.
It is set with ladder axle sleeve 6 in 1 periphery of shaft, 7 quantity of step of ladder axle sleeve 6 is identical as pole tooth 11.In ladder
The 7 endface circumferential direction of every level-one step of axle sleeve 6 is provided with groove, and permanent magnet 9 is equipped in groove.The magnetic pole of two adjacent permanent magnets 9
Polarity it is opposite.
The permanent magnet 9 and pole tooth 11 face one by one, and there are gap between permanent magnet 9 and the pole tooth 11 of its face,
Gap ranging from 0.05~5mm.Gap location is marked with magnetic fluid 8.
The shaft 1 is multi-diameter shaft, and the bearing includes the first bearing 3 and second bearing abutted with the shoulder of shaft 1
12.2 inner cavity one end of the shell is equipped with stopper section 13.3 other end of first bearing is abutted with the stopper section 13.Second bearing 12
It is sealed in 2 inner cavity of shell by the compression of end cap 14.The pole shoe 5 is set between first bearing 3 and second bearing 12.
It is equipped with the first magnetism-isolating loop 4 between the end face outside and first bearing 3 and second bearing 12 of pole shoe 5.
Be close to ladder axle sleeve 6 be equipped with the second magnetism-isolating loop 15 close to that end face of permanent magnet 9.
Claims (7)
1. a kind of magnetic fluid sealing structure, including hollow shell（2）, be set to shell（2）The shaft of inner cavity（1）, shaft（1）
With shell（2）Pass through bearing assembly connection, it is characterised in that：In shell（2）Inner wall sleeve is equipped at least one pole shoe（5）, each
Pole shoe（5）A wherein side end face be equipped with pole tooth（11）；
In shaft（1）Periphery is set with ladder axle sleeve（6）, ladder axle sleeve（6）Step（7）Quantity and pole tooth（11）It is identical；
In ladder axle sleeve（6）Every level-one step（7）Endface circumferential direction is provided with groove, and permanent magnet is equipped in groove（9）, it is two neighboring forever
Magnet（9）Magnetic pole polarity it is opposite；
The permanent magnet（9）With pole tooth（11）Face one by one, and permanent magnet（9）With the pole tooth of its face（11）Between exist between
Gap, gap location are marked with magnetic fluid（8）.
2. magnetic fluid sealing structure according to claim 1, it is characterised in that：The pole shoe（5）There are one if, pole shoe
（5）On set there are two pole tooth（11）.
3. magnetic fluid sealing structure according to claim 1 or 2, it is characterised in that：The ladder axle sleeve（6）Step
（7）Series is 2~10 grades.
4. magnetic fluid sealing structure according to claim 1 or 2, it is characterised in that：Interstice coverage is 0.05~5mm.
5. magnetic fluid sealing structure according to claim 1, it is characterised in that：Pole shoe（5）Periphery and shell（2）Inner wall
Between pass through sealing ring（10）Sealing.
6. magnetic fluid sealing structure according to claim 1, it is characterised in that：The shaft（1）For multi-diameter shaft, the axis
It contracts and includes and shaft（1）Shoulder abut first bearing（3）And second bearing（12）；The shell（2）Inner cavity one end is equipped with
Stopper section（13）, first bearing（3）Other end and the stopper section（13）It abuts, second bearing（12）Pass through end cap（14）It compresses
It is sealed in shell（2）Inner cavity；The pole shoe（5）It is set to first bearing（3）And second bearing（12）Between.
7. magnetic fluid sealing structure according to claim 6, it is characterised in that：In pole shoe（5）End face outside and first
Bearing（3）And second bearing（12）Between be equipped with the first magnetism-isolating loop（4）；
It is close to ladder axle sleeve（6）Institute is close to permanent magnet（9）That end face be equipped with the second magnetism-isolating loop（15）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810141729.9A CN108488390A (en) | 2018-02-11 | 2018-02-11 | A kind of magnetic fluid sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810141729.9A CN108488390A (en) | 2018-02-11 | 2018-02-11 | A kind of magnetic fluid sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108488390A true CN108488390A (en) | 2018-09-04 |
Family
ID=63340125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810141729.9A Pending CN108488390A (en) | 2018-02-11 | 2018-02-11 | A kind of magnetic fluid sealing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108488390A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728111A (en) * | 2021-01-18 | 2021-04-30 | 清华大学 | Magnetic liquid sealing device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4455026A (en) * | 1982-12-07 | 1984-06-19 | Mechanical Technology Incorporated | Vee-shaped magnetic/centrifugal seal and method of operation |
| JP2001050400A (en) * | 1999-08-03 | 2001-02-23 | Nok Corp | Magnetic fluid sealing device |
| CN106224557A (en) * | 2016-05-25 | 2016-12-14 | 广西科技大学 | A kind of mixing is for magnetic-type end-surface type magnetic fluid seal device |
| CN205824190U (en) * | 2016-07-29 | 2016-12-21 | 广西科技大学 | A kind of notch cuttype end-surface type magnetic fluid seal device |
-
2018
- 2018-02-11 CN CN201810141729.9A patent/CN108488390A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4455026A (en) * | 1982-12-07 | 1984-06-19 | Mechanical Technology Incorporated | Vee-shaped magnetic/centrifugal seal and method of operation |
| JP2001050400A (en) * | 1999-08-03 | 2001-02-23 | Nok Corp | Magnetic fluid sealing device |
| CN106224557A (en) * | 2016-05-25 | 2016-12-14 | 广西科技大学 | A kind of mixing is for magnetic-type end-surface type magnetic fluid seal device |
| CN205824190U (en) * | 2016-07-29 | 2016-12-21 | 广西科技大学 | A kind of notch cuttype end-surface type magnetic fluid seal device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728111A (en) * | 2021-01-18 | 2021-04-30 | 清华大学 | Magnetic liquid sealing device |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180904 |