CN207906452U - A kind of convex multi-diameter shaft device for sealing magnetic fluid - Google Patents
A kind of convex multi-diameter shaft device for sealing magnetic fluid Download PDFInfo
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- CN207906452U CN207906452U CN201721731216.0U CN201721731216U CN207906452U CN 207906452 U CN207906452 U CN 207906452U CN 201721731216 U CN201721731216 U CN 201721731216U CN 207906452 U CN207906452 U CN 207906452U
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- Prior art keywords
- pole shoe
- transition face
- magnetic fluid
- pole
- wall
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- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The utility model is related to a kind of convex multi-diameter shaft device for sealing magnetic fluid, including shell, seal assembly and end cap；The seal assembly includes axis, and the axis is rotatably mounted to by bearing in shell, and axis includes at least one convex stepped part, and the convex stepped part includes multiple axially aligned steps successively, and passing through arc angling shape transition face between the outer wall of adjacent step connects；It is arranged with and the matched pole shoe of the transition face outside each transition face, the pole shoe extends to position corresponding to the transition face side respective step to transition face one or both sides direction, there are gap between the inner wall of the pole shoe and corresponding transition face, step, position corresponding with pole shoe inner wall offers pole tooth on the pole shoe inner wall and/or on axis；Permanent magnet is equipped between adjacent pole shoe.The voltage endurance capability of the utility model is strong, and secondary bearing capacity and self-reparing capability are strong, and the voltage endurance capability of magnetic fluid seal and sealing reliability are strong under the conditions of wide arc gap, and range of safety operation is big.
Description
Technical field
The utility model is related to a kind of convex multi-diameter shaft device for sealing magnetic fluid, belong to sealing field of mechanical engineering.
Background technology
Magnet fluid sealing be the magnet fluid sealing ring that is formed under the action of high-intensity magnetic field by magnetic fluid to gas, liquid into
Row sealing, since it is contact being sealed by magnetic fluid, thus avoid and seal axis and sealing element between sealing axis
Direct friction and additional load is reduced, magnet fluid sealing also has the characteristics that zero leakage, reliability height, simple in structure in addition.
Although magnetic fluid vacuum low-pressure seal upper technology oneself through comparative maturity, also obtained comparing being widely applied, in high pressure gas
Body is sealed on hydraulic seal, and also many problems do not solve, and the medium as Sealing pressure is too small, is sealed can draw
It plays the rotten of magnetic fluid and leads to seal rapid failure etc., sealing difficulty is big, also has a certain distance from practical application.Therefore,
Magnetic fluid seal structural parameters how are rationally designed, improve the utilization ratio of permanent magnet, enhancing sealing voltage endurance capability is also mesh
One significant research contents of preceding Magneticfluid Seal Technique.
One of the method for improving wide arc gap magnetic Fluid Sealing pressure resistance performance is by increasing in magnet fluid sealing magnetic circuit
The quantity of magnetic source and the shape for improving pole shoe, the sealing as described in documents 1 (patent of Publication No. CN204805552U)
Sealing device described in device and documents 2 (patent of Publication No. CN202418592U).Although described in document above
The relatively common magnetic fluid seal performance of two kinds of sealing devices is greatly improved, but the sealing performance of existing sealing structure is still
There is the space further increased.
Magnetic fluid does not have magnetism in static state, only when adding magnetic fields outside, just shows magnetism.Magnetic particle and carrier fluid
It is muddy integral, to make the magnetic fluid not only magnetism with common magnetic material, but also the mobility with liquid, therefore have
Many unique properties.
For relatively common single magnetic source magnetic fluid seal or common more magnetic source magnet fluid sealings, existing sealing device
Increase magnetic field force intensity so that sealing performance is greatly improved, but it is highly denser still to can not meet high-speed overload occasion
The requirement of sealing property.
Utility model content
The purpose of this utility model is to provide a kind of convex multi-diameter shaft device for sealing magnetic fluid, to solve existing single magnetic source magnetic
The low problem of pressure-resistant performance existing for fluid seal apparatus and more magnetic source device for sealing magnetic fluid, while reducing stress concentration, make
The sealing technique is obtained to be successfully applied in the fields such as high-speed overload.
In order to solve the above-mentioned technical problem, the technical solution of the utility model is as follows：A kind of convex multi-diameter shaft magnet fluid sealing
Device, including the shell of both ends open, seal assembly and the end cap for being pressed in seal assembly in shell；The sealing group
Part includes axis, and the axis is rotatably mounted to by bearing in shell, and the axis includes at least one convex stepped part, the convex rank
Terraced portion includes multiple axially aligned steps successively, and passing through arc angling shape transition face between the outer wall of adjacent step connects；
It is arranged with outside each transition face and extends to this to transition face one or both sides direction with the matched pole shoe of the transition face, the pole shoe
Position corresponding to the respective step of transition face side, there are gap, institutes between the inner wall of the pole shoe and corresponding transition face, step
It states on pole shoe inner wall and/or position corresponding with pole shoe inner wall offers pole tooth on axis；Permanent magnet is equipped between adjacent pole shoe.
Further, it is connected by radiussed transition face between the outer wall of adjacent step.
Further, the circular arc curvature radius of pole shoe part corresponding with radiussed transition face, pole shoe inner ring surface is more than axis
The circular arc curvature radius of upper corresponding transition face；Further, the circular arc curvature radius of pole shoe inner ring surface is 3 ~ 43mm；Correspondingly,
The radius of curvature of circular arc is 2 ~ 40mm on axis.
Further, when the quantity of step in single convex stepped part is more than 2, axially distributed adjacent permanent magnet
Sides adjacent magnetic pole is identical.
Further, the pole tooth includes axial poles tooth and/or transition pole tooth, axial poles tooth be set on step and/or
On pole shoe inner wall corresponding with step, transition pole tooth is set on transition face and/or pole shoe inner wall corresponding with transition face
On.
Preferably, in single convex stepped part, the quantity of step is 3-11, and the quantity of transition face is 2-10, pole shoe
Quantity is 2-10.
As a kind of embodiment of the utility model, the convex stepped part includes 1 first step, 2 second steps
With 2 third steps, the diameter of the first step, second step and third step is sequentially reduced, 2 second steps and
2 third steps are symmetrically distributed in first step both sides successively.
Further, the gap size is 0.05-5mm, preferably 2-5mm.
Further, the outer wall of the pole shoe is equipped with annular recess, and sealing ring is equipped in the annular recess.
Further, in single convex stepped part, the first magnetism-isolating loop and the are respectively equipped on the outside of outermost two pole shoes
Two magnetism-isolating loops.
Further, the quantity of the bearing is two, respectively first bearing and second bearing, and is respectively arranged at rank
The both sides in terraced portion.
Further, the end cap is detachably secured to shell right end.Preferably, the end cap be threadably secured in
Shell right end.
The sealing device of the utility model can solve the insufficient problem of wide arc gap condition lower sealing device voltage endurance capability.Pass through
Design a kind of convex rank ladder type shaft with arc angling shape transition face（Dome arc multi-diameter shaft）With circular arc type pole shoe structure, preferably
Ground, circular arc type pole shoe radially inner ring face and circular arc type side（Arcwall face corresponding with arc angling shape transition face）On uniformly open
If the pole tooth of respective shapes, between the pole shoes there by permanent magnet insertion, the radial direction and circular arc formed in pole shoe and dome arc multi-diameter shaft
Magnetic fluid is injected in the seal clearance of face direction, to realize a kind of convex multi-diameter shaft magnet fluid sealing.The utility model is in staged
On the basis of magnet fluid sealing, by the way that multistage magnetic source is arranged and improves the distribution form of pole tooth on pole shoe, the structure of axis is improved, by square
Shape multi-diameter shaft is improved to dome arc multi-diameter shaft, so that magnet fluid sealing voltage endurance capability greatly enhances；The sealing of convex circular arc type
The loss of magnetic fluid when structure can reduce seal failure reduces stress concentration, facilitates production and processing, while increasing sealing device
Secondary bearing capacity and self-reparing capability.Further increase the voltage endurance capability of magnetic fluid seal and sealing under the conditions of wide arc gap
Reliability expands its range of safety operation.
To sum up, the device for sealing magnetic fluid voltage endurance capability of the utility model is strong, and production and processing is convenient；When seal failure, magnetic
The loss of fluid is small, and secondary bearing capacity and self-repairing capability are strong, effectively increases the voltage endurance capability of device under the conditions of wide arc gap
And sealing reliability, to expand range of safety operation.
Description of the drawings
Fig. 1 is the cross-sectional view of the device for sealing magnetic fluid of the utility model the first embodiment.
Specific implementation mode
The utility model is described in detail below with reference to attached drawing and in conjunction with the embodiments.It should be noted that not conflicting
In the case of, the feature in the embodiments of the present invention and embodiment can be combined with each other.For sake of convenience, hereinafter such as
There are "upper", "lower", "left", "right" printed words, only indicates consistent with the upper and lower, left and right direction of attached drawing itself, not to structure
Play restriction effect.
As shown in Figure 1, a kind of convex multi-diameter shaft device for sealing magnetic fluid, includes shell 2, seal assembly and the use of both ends open
In the end cap 14 being pressed in seal assembly in shell 2；The seal assembly includes axis 1, and the axis 1 is rotationally pacified by bearing
Loaded in shell 2, the axis 1 includes a convex stepped part 101, and the convex stepped part 101 includes 5 axially aligned successively
Step is connected by radiussed transition face between the outer wall of adjacent step；It is arranged with outside each transition face and is matched with the transition face
Pole shoe, the pole shoe is to transition face lateral direction（Transition face diameter reduction direction）Extend to the transition face side respective step
Corresponding position, there are gap between the inner wall of the pole shoe and corresponding transition face, step, on the pole shoe inner wall and axis 1
Upper position corresponding with pole shoe inner wall offers pole tooth；Permanent magnet is equipped between adjacent pole shoe.
Wherein, the convex stepped part 101 includes 1 first step, 1011,2 second steps 1012 and 2 third steps
1013, the diameter of the first step 1011, second step 1012 and third step 1013 is sequentially reduced, described 2 second
Rank 1012 and 2 third steps 1013 are symmetrically distributed in 1011 both sides of first step successively.Pass through fillet between each adjacent step
Shape transition face connects, and outside the stepped part, from left to right, position corresponding with each transition face is arranged with the first from left pole shoe respectively
22, the second from left pole shoe 19, right diode boot 17 and a right pole shoe 15.From left to right, it is respectively equipped with the first from left between above-mentioned each adjacent pole shoe
Permanent magnet 7, intermediate permanent magnet 8 and a right permanent magnet 9, the sides adjacent magnetic pole of adjacent permanent magnet are identical.
The pole tooth includes axial poles tooth and transition pole tooth, and axial poles tooth is set to pole shoe inner wall corresponding with step
On, transition pole tooth is set on transition face.Correspondingly, the inner wall corresponding with third step 1013 of the first from left pole shoe 22 is equipped with the
One left axial poles tooth 5, transition face corresponding with the first from left pole shoe 22 are equipped with the first left transition pole tooth 6；The second from left pole shoe 19 and
Two steps, 1012 corresponding inner wall is equipped with the second left axial poles tooth, and transition face corresponding with the second from left pole shoe 19 is equipped with the
Two left transition pole teeth.A right pole shoe 15 inner wall corresponding with third step 1013 is equipped with the first right axial poles tooth 11, with the right side
One pole shoe, 15 corresponding transition face is equipped with the first right transition pole tooth 10；Right diode boot 17 is corresponding with second step 1012
Inner wall is equipped with the second right axial poles tooth, and transition face corresponding with right diode boot 17 is equipped with the second right transition pole tooth.
The gap size is 3mm.
The outer wall of the pole shoe is equipped with annular recess, and sealing ring is equipped in the annular recess.Correspondingly, the first from left pole shoe
22, the first from left sealing ring 21, a left side are respectively equipped in the annular recess on 15 outer wall of the second from left pole shoe 19, right diode boot 17 and a right pole shoe
Two sealing rings 20, right two sealing rings 18 and a right sealing ring 16.
In single convex stepped part, the first magnetism-isolating loop 4 and the second magnetism-isolating loop are respectively equipped on the outside of outermost two pole shoes
12。
The quantity of the bearing is two, respectively first bearing 3 and second bearing 13, and is respectively arranged at first every magnetic
The outside of ring 4 and the second magnetism-isolating loop 12.
The end cap 14 is detachably secured to 2 right end of shell.
When assembly, mainly include the following steps：
（1）The first from left sealing ring 21 is mounted in the groove on 22 periphery of the first from left pole shoe；
The second from left sealing ring 20 is mounted in the groove on 19 periphery of the second from left pole shoe；
Right two sealing rings 18 are mounted in the groove on 17 periphery of right diode boot；
A right sealing ring 16 is mounted in the groove on 15 periphery of a right pole shoe；
（2）Intermediate permanent magnet 8, the second from left pole shoe 19, the first from left permanent magnet 7, the first from left pole shoe 22 are installed successively from the left side of axis
On axis 1；
Magnetic fluid is infused in the seal clearance that the first from left pole shoe 22, the second from left pole shoe 19 and axis 1 are formed；
Right diode boot 17, a right permanent magnet 9, a right pole shoe 15 are sequentially arranged on the right side of axis on axis 1；
Magnetic fluid is infused in right diode boot 17, in the seal clearance that one pole shoe 15 of the right side is formed with axis 1；
（3）First magnetism-isolating loop 4, first bearing 3 are sequentially arranged at from the left side of axis is suitable on axis 1；
Second magnetism-isolating loop 12, second bearing 13 are sequentially arranged on the right side of axis on axis 1, seal assembly is formed；
（4）Seal assembly is mounted in shell 2, right bearing 13 is compressed with being threadedly coupled for shell 2 by end cap 14
Outer ring；Realize a kind of convex multi-diameter shaft magnet fluid sealing.
The content that above-described embodiment illustrates should be understood as that these embodiments are only used for being illustrated more clearly that the utility model,
Rather than limitation the scope of the utility model, after having read the utility model, those skilled in the art are new to this practicality
The modification of the various equivalent forms of type each falls within the application range as defined in the appended claims.
Claims (10)
1. a kind of convex multi-diameter shaft device for sealing magnetic fluid, includes the shell of both ends open（2）, seal assembly and for by sealing group
Part is pressed in shell（2）Interior end cap（14）；The seal assembly includes axis（1）, the axis（1）It is rotationally installed by bearing
In shell（2）It is interior, which is characterized in that the axis（1）Including at least one convex stepped part（101）, the convex stepped part（101）Packet
Multiple axially aligned steps successively are included, passing through arc angling shape transition face between the outer wall of adjacent step connects；Each mistake
It crosses outside face to be arranged with and extends to the transition face to transition face one or both sides direction with the matched pole shoe of the transition face, the pole shoe
Position corresponding to the respective step of side, there are gap, the pole shoes between the inner wall of the pole shoe and corresponding transition face, step
On inner wall and/or axis（1）Upper position corresponding with pole shoe inner wall offers pole tooth；Permanent magnet is equipped between adjacent pole shoe.
2. convex multi-diameter shaft device for sealing magnetic fluid according to claim 1, which is characterized in that between the outer wall of adjacent step
It is connected by radiussed transition face.
3. convex multi-diameter shaft device for sealing magnetic fluid according to claim 1, which is characterized in that when the quantity of step is more than 2
When a, the sides adjacent magnetic pole of axially distributed adjacent permanent magnet is identical.
4. convex multi-diameter shaft device for sealing magnetic fluid according to claim 1, which is characterized in that the pole tooth includes axial poles
Tooth and/or transition pole tooth, axial poles tooth be set on step and/or pole shoe inner wall corresponding with step on, transition pole tooth is set
Be placed on transition face and/or pole shoe inner wall corresponding with transition face on.
5. convex multi-diameter shaft device for sealing magnetic fluid according to claim 1, which is characterized in that the convex stepped part（101）
Including 1 first step（1011）, 2 second steps（1012）With 2 third steps（1013）, the first step
（1011）, second step（1012）With third step（1013）Diameter be sequentially reduced, 2 second steps（1012）With 2
A third step（1013）It is symmetrically distributed in first step successively（1011）Both sides.
6. convex multi-diameter shaft device for sealing magnetic fluid according to claim 1, which is characterized in that the gap size is
0.05-5mm。
7. convex multi-diameter shaft device for sealing magnetic fluid according to claim 1, which is characterized in that set on the outer wall of the pole shoe
There is annular recess, sealing ring is equipped in the annular recess.
8. convex multi-diameter shaft device for sealing magnetic fluid according to claim 1, which is characterized in that in single convex stepped part, most
It is respectively equipped with the first magnetism-isolating loop on the outside of two pole shoes in outside（4）With the second magnetism-isolating loop（12）.
9. convex multi-diameter shaft device for sealing magnetic fluid according to claim 1, which is characterized in that the quantity of the bearing is two
It is a, respectively first bearing（3）And second bearing（13）, and it is respectively arranged at the both sides of stepped part.
10. convex multi-diameter shaft device for sealing magnetic fluid according to claim 1, which is characterized in that the end cap（14）It is removable
It is fixed on shell with unloading（2）Right end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721731216.0U CN207906452U (en) | 2017-12-13 | 2017-12-13 | A kind of convex multi-diameter shaft device for sealing magnetic fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721731216.0U CN207906452U (en) | 2017-12-13 | 2017-12-13 | A kind of convex multi-diameter shaft device for sealing magnetic fluid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207906452U true CN207906452U (en) | 2018-09-25 |
Family
ID=63567632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721731216.0U Expired - Fee Related CN207906452U (en) | 2017-12-13 | 2017-12-13 | A kind of convex multi-diameter shaft device for sealing magnetic fluid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207906452U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107893853A (en) * | 2017-12-13 | 2018-04-10 | 广西科技大学 | A kind of convex multi-diameter shaft device for sealing magnetic fluid |
| CN112728099A (en) * | 2020-12-24 | 2021-04-30 | 清华大学 | Magnetic medium sealing device capable of sealing liquid |
-
2017
- 2017-12-13 CN CN201721731216.0U patent/CN207906452U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107893853A (en) * | 2017-12-13 | 2018-04-10 | 广西科技大学 | A kind of convex multi-diameter shaft device for sealing magnetic fluid |
| CN107893853B (en) * | 2017-12-13 | 2021-02-12 | 广西科技大学 | Convex step shaft magnetic fluid sealing device |
| CN112728099A (en) * | 2020-12-24 | 2021-04-30 | 清华大学 | Magnetic medium sealing device capable of sealing liquid |
| CN112728099B (en) * | 2020-12-24 | 2022-02-08 | 清华大学 | Magnetic medium sealing device capable of sealing liquid |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180925 Termination date: 20191213 |
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| CF01 | Termination of patent right due to non-payment of annual fee |