CN207539343U - A kind of recessed multi-diameter shaft device for sealing magnetic fluid - Google Patents
A kind of recessed multi-diameter shaft device for sealing magnetic fluid Download PDFInfo
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- CN207539343U CN207539343U CN201721730596.6U CN201721730596U CN207539343U CN 207539343 U CN207539343 U CN 207539343U CN 201721730596 U CN201721730596 U CN 201721730596U CN 207539343 U CN207539343 U CN 207539343U
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- split
- pole shoe
- type pole
- transition face
- recessed
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Abstract
The utility model is related to a kind of recessed multi-diameter shaft device for sealing magnetic fluid, including shell, seal assembly and end cap；Seal assembly includes axis, and axis is rotatably mounted to by bearing in shell, and axis includes recessed stepped part, and recessed stepped part includes multiple axially aligned steps successively, and passing through chamfering shape transition face between the outer wall of adjacent step connects；It is arranged with and the matched split-type pole shoe of the transition face outside each transition face, split-type 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 split-type pole shoe and corresponding transition face, step, pole tooth is offered on split-type pole shoe inner wall；Permanent magnet is equipped between adjacent split-type pole shoe.The device voltage endurance capability of the utility model is strong, and production and processing is convenient；During seal failure, the loss of magnetic fluid is small, and secondary bearing capacity and self-repairing capability are strong, effectively increases the voltage endurance capability and sealing reliability of device under the conditions of wide arc gap, so as to expand range of safety operation.
Description
Technical field
The utility model is related to a kind of recessed multi-diameter shaft device for sealing magnetic fluid, belong to sealing field of mechanical engineering.
Background technology
Magnet fluid sealing is that gas, liquid are carried out by the magnet fluid sealing ring that magnetic fluid is formed under the influence of a magnetic field
Sealing since it is to carry out contact sealing by magnetic fluid between sealing axis, thus is avoided between sealing axis and sealing element
Direct friction, reduce additional load.Have the advantages that other sealing means are incomparable in rotation axis seal, by state
Inside and outside scholar and the attention of engineers and technicians, have great importance in fields such as industry, national defence.Magnet fluid sealing relative to
Though traditional mechanical seal or packing seal has the particular advantages such as its No leakage, low abrasion, the resistance to pressure energy of magnet fluid sealing
Power is not too much high, and multi-stage sealed sealing series can not be too many.Therefore, magnetic fluid seal structure ginseng how is rationally designed
Number improves the utilization ratio of permanent magnet, and enhancing sealing voltage endurance capability, which is also that current Magneticfluid Seal Technique one is significant, to be ground
Study carefully content.
One of 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. CN202332310U)
Sealing device described in device and documents 2 (patent of Publication No. CN206600473U).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 improved.
Magnet fluid sealing is to generate magnetic field force in seal clearance using permanent magnet magnetic fluid is secured firmly between sealing
In gap, the pressure difference of both sides is resisted, so as to achieve the effect that sealing.
Utility model content
The purpose of this utility model is to provide a kind of recessed multi-diameter shaft device for sealing magnetic fluid, so as 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 reduce 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 recessed multi-diameter shaft magnet fluid sealing
Device, shell, seal assembly including both ends open and for seal assembly to be pressed in the end cap 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 recessed stepped part, the recessed rank
Terraced portion includes multiple axially aligned steps successively, and passing through chamfering shape transition face between the outer wall of adjacent step connects；Each
Be arranged with outside transition face with the matched split-type pole shoe of the transition face, the split-type pole shoe is to transition face one or both sides direction
Extend to position corresponding to the transition face side respective step, the inner wall of the split-type pole shoe and corresponding transition face, step it
Between there are gap, offered on the split-type pole shoe inner wall and/or on axis with the corresponding position of split-type pole shoe inner wall
Pole tooth；Permanent magnet is equipped between adjacent split-type pole shoe.
Further, the angle of the central axis of the transition face and axis is 5-75 degree, preferably 20-60 °.Correspondingly,
The split-type pole shoe inner wall and the corresponding portion tilting angle of transition face are identical with corresponding transition face.
Preferably, the quantity of transition face is 2-10.
Further, the pole tooth include axial poles tooth and/or transition pole tooth, axial poles tooth be set on step and/or
With on the corresponding split-type pole shoe inner wall of step, transition pole tooth be set on transition face and/or with corresponding point of transition face
On flap-type pole shoe inner wall.
Preferably, the pole tooth includes axial poles tooth and transition pole tooth, and axial poles tooth is set to and corresponding point of step
On flap-type pole shoe inner wall, transition pole tooth be set to on the corresponding split-type pole shoe inner wall of transition face.
Further, on single split-type pole shoe inner wall, the quantity of axial poles tooth and transition pole tooth is 2-10.
As a kind of embodiment of the utility model, the recessed 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 increased, 2 second steps and
2 third steps are symmetrically distributed in first step both sides successively.
Further, the quantity of the split-type pole shoe is 3, respectively axially distributed the first split-type pole successively
Boots, the second split-type pole shoe and third split-type pole shoe, it is outer and to first that the second split-type pole shoe is sheathed on first step
Step both sides extend to corresponding transition face corresponding position；The first split-type pole shoe and third split-type pole shoe are respectively arranged at
The arranged on left and right sides of second split-type pole shoe, the first split-type pole shoe are sheathed on second step and on the left of first step
Outside three steps, third split-type pole shoe is sheathed on outside the second step on the right side of first step and third step；First point of valve
The inner wall of formula pole shoe, the second split-type pole shoe and third split-type pole shoe matches respectively with respective step and transition face shape.
Further, between the first split-type pole shoe and the second split-type pole shoe, the second split-type pole shoe and third
The first permanent magnet and the second permanent magnet, first permanent magnet and the second permanent magnet sides adjacent are respectively equipped between split-type pole shoe
Magnetic pole it is identical.
Further, the gap size is 0.05-5mm.
Further, the outer wall of the split-type pole shoe is equipped with annular recess, and sealing ring is equipped in the annular recess.
Further, in single recessed stepped part, the first magnetism-isolating loop and are respectively equipped on the outside of outermost two pole shoes
Two magnetism-isolating loops.
Further, the quantity of the bearing is two, respectively clutch shaft bearing and second bearing, and be respectively arranged at recessed
The both sides of stepped part.
Further, the end cap is detachably secured to shell right end.
The recessed multi-diameter shaft device for sealing magnetic fluid of the utility model can solve wide arc gap condition lower sealing device voltage endurance capability
Insufficient problem.Pass through axis of the design with recessed stepped part and corresponding convex trapezoidal pole shoe structure（From the vertical of split-type pole shoe
Section is seen）, trapezoidal pole shoe inner ring surface and the pole tooth with uniformly opening up corresponding shape on the corresponding inner wall of transition face will forever
Magnet, which is embedded in the radial direction and transition face direction seal clearance between the pole shoes there, formed in pole shoe and trapezoid shaft, injects magnetic fluid,
So as to fulfill a kind of recessed multi-diameter shaft magnet fluid sealing.The utility model is more by setting on the basis of staged magnet fluid sealing
Grade magnetic source and the distribution form for improving pole tooth on pole shoe improve the structure of axis, so that magnet fluid sealing voltage endurance capability is significantly
Enhancing；The loss of magnetic fluid, reduces stress concentration when recessed stepped sealing structure with chamfering can reduce seal failure, convenient
Production and processing, while increase the secondary bearing capacity and self-reparing capability of sealing device；Under the conditions of further improving wide arc gap
The voltage endurance capability and sealing reliability of magnetic fluid seal, expand 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；During 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, so as 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.
Fig. 2 is the sectional view of the line A-A along Fig. 1.
Specific embodiment
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 embodiment and embodiment in the utility model can be combined with each other.For sake of convenience, hereinafter such as
There are " on ", " under ", "left", "right" printed words, only represent consistent with the upper and lower, left and right direction of attached drawing in itself, not to structure
Play restriction effect.
As shown in Figure 1, a kind of recessed multi-diameter shaft device for sealing magnetic fluid, shell 2, seal assembly and use including both ends open
In the end cap 10 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 recessed stepped part 101, and the recessed stepped part 101 is axially aligned successively including 5
Step passes through chamfering shape transition face between the outer wall of adjacent step and connects；It is arranged with outside each transition face and is matched with the transition face
Split-type pole shoe, the split-type pole shoe extends to the transition face side respective step institute to transition face one or both sides direction
Corresponding position, there are gap between the inner wall of the split-type pole shoe and corresponding transition face, step, in the split-type pole shoe
Pole tooth is offered on wall；Permanent magnet is equipped between adjacent split-type pole shoe.
Wherein, the angle of the central axis of the transition face and axis is 45 degree.
The pole tooth includes axial poles tooth and transition pole tooth, and axial poles tooth is set to and the corresponding split-type pole shoe of step
On inner wall, transition pole tooth be set to on the corresponding split-type pole shoe inner wall of transition face.
The recessed 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 increased, 2 second steps 1012
It is symmetrically distributed in 1011 both sides of first step successively with 2 third steps 1013.
The quantity of the split-type pole shoe is 3, respectively axially distributed the first split-type pole shoe 19, second successively
Split-type pole shoe 17 and third split-type pole shoe 15, it is outer and to that the second split-type pole shoe 17 is sheathed on first step 1011
One step both sides extend to corresponding transition face corresponding position；The first split-type pole shoe 19 and third split-type pole shoe 15 are distinguished
The arranged on left and right sides of the second split-type pole shoe 17 is set to, the first split-type pole shoe 19 is sheathed on the left of first step
Outside two steps and third step, third split-type pole shoe 15 is sheathed on outside the second step on the right side of first step and third step；
The inner wall of the first split-type pole shoe 19, the second split-type pole shoe 17 and third split-type pole shoe 15 respectively with respective step and
Transition face shape matches.
Between the first split-type pole shoe 19 and the second split-type pole shoe 17, the second split-type pole shoe 17 and third divide valve
The first permanent magnet 8 and the second permanent magnet 10,8 and second permanent magnet of the first permanent magnet, 10 phase are respectively equipped between formula pole shoe 15
The magnetic pole of adjacent side is identical.
First split-type pole shoe 19 on second step and the corresponding inner ring surface of third step with being respectively equipped with the first pole shoe
Axial poles tooth A5 and the first pole shoe axial poles tooth B7, the transition between the first split-type pole shoe 19 and second step and third step
The corresponding inner wall in face is equipped with the first pole shoe transition pole tooth 6.
Second split-type pole shoe 17 is equipped with the second pole shoe pole tooth 9 to first step and the corresponding inner wall of corresponding transition face.
Correspondingly, third split-type pole shoe 15 is equipped with third pole shoe pole tooth 11.
The gap size is 2.5mm.
The outer wall of the split-type pole shoe is equipped with annular recess, and sealing ring is equipped in the annular recess.Correspondingly,
The first sealing ring 20, the annular recess of 17 outer wall of the second split-type pole shoe are equipped in the annular recess of one split-type pole shoe, 19 outer wall
The second sealing ring 18 is inside equipped with, third sealing ring 16 is equipped in the annular recess of 15 outer wall of third split-type pole shoe.Preferably, institute
It states split-type pole shoe and includes 2 sub- pole shoes, 2 sub- pole shoes can be combined with each other to form split-type pole shoe（See Fig. 2）.
In single recessed stepped part, the outside of the first split-type pole shoe 19 and third split-type pole shoe 15 be respectively equipped with first every
4 and second magnetism-isolating loop 12 of magnet ring.
The quantity of the bearing is two, respectively clutch shaft bearing 3 and second bearing 13, and be respectively arranged at first every magnetic
The outside of 4 and second magnetism-isolating loop 12 of ring.
The end cap 14 is threadably secured in 2 right end of shell.
During assembling, mainly include the following steps：
（1）2 sub- pole shoes of the first split-type pole shoe 19 are installed to from 1 upper and lower both sides of axis on axis 1；By the first sealing
Circle 20 is mounted in the groove on 19 periphery of the first split-type pole shoe；
First permanent magnet 8 is installed to from right side on axis 1；
2 sub- pole shoes of the second split-type pole shoe 17 are installed to from 1 upper and lower both sides of axis on axis 1；By the second sealing ring 18
In the groove on 17 periphery of the second split-type pole shoe；
Second permanent magnet 10 is installed to from right side on axis 1；
2 sub- pole shoes of third split-type pole shoe 15 are installed to from 1 upper and lower both sides of axis on axis 1；By third sealing ring 16
In the groove on 15 periphery of the second split-type pole shoe；
（2）By magnetic fluid be infused in third split-type pole shoe 15, the second split-type pole shoe 17, the first split-type pole shoe 19 with
In the seal clearance that axis 1 is formed；
（3）First magnetism-isolating loop 4, clutch shaft bearing 3 are sequentially arranged on the left of axis on axis 1；
Second magnetism-isolating loop 12, second bearing 13 are sequentially arranged on the right side of axis on axis 1, form seal assembly；
（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 recessed multi-diameter shaft magnet fluid sealing.
The content that above-described embodiment illustrates should be understood to 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 the utility model has been read, 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 recessed multi-diameter shaft device for sealing magnetic fluid, the shell including 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 recessed stepped part（101）, the recessed stepped part（101）Packet
Multiple axially aligned steps successively are included, passing through chamfering shape transition face between the outer wall of adjacent step connects；Each transition face
Outer be arranged with extends to the matched split-type pole shoe of the transition face, the split-type pole shoe to transition face one or both sides direction
Position corresponding to the transition face side respective step, is stayed between the inner wall of the split-type pole shoe and corresponding transition face, step
There is a gap, on the split-type pole shoe inner wall and/or axis（1）The upper and corresponding position of split-type pole shoe inner wall offers pole
Tooth；Permanent magnet is equipped between adjacent split-type pole shoe.
2. recessed multi-diameter shaft device for sealing magnetic fluid according to claim 1, which is characterized in that in the transition face and axis
The angle of mandrel line is 5-75 degree.
3. recessed 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 on the corresponding split-type pole shoe inner wall of step, transition
Pole tooth be set on transition face and/or on the corresponding split-type pole shoe inner wall of transition face.
4. recessed multi-diameter shaft device for sealing magnetic fluid according to claim 1, which is characterized in that the recessed 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 increased, 2 second steps（1012）With 2
A third step（1013）It is symmetrically distributed in first step successively（1011）Both sides.
5. recessed multi-diameter shaft device for sealing magnetic fluid according to claim 4, which is characterized in that the number of the split-type pole shoe
It is 3 to measure, respectively axially distributed the first split-type pole shoe successively（19）, the second split-type pole shoe（17）Divide valve with third
Formula pole shoe（15）, the second split-type pole shoe（17）It is sheathed on first step（1011）It extends to outside and to first step both sides
Corresponding transition face corresponding position；The first split-type pole shoe（19）With third split-type pole shoe（15）It is respectively arranged at second point
Flap-type pole shoe（17）Arranged on left and right sides, the first split-type pole shoe（19）Be sheathed on second step on the left of first step and
Outside third step, third split-type pole shoe（15）Outside the second step and third step being sheathed on the right side of first step；Described
One split-type pole shoe（19）, the second split-type pole shoe（17）With third split-type pole shoe（15）Inner wall respectively with respective step and
Transition face shape matches.
6. recessed multi-diameter shaft device for sealing magnetic fluid according to claim 5, which is characterized in that the first split-type pole shoe
（19）With the second split-type pole shoe（17）Between, the second split-type pole shoe（17）With third split-type pole shoe（15）Between set respectively
There is the first permanent magnet（8）With the second permanent magnet（10）, first permanent magnet（8）With the second permanent magnet（10）The magnetic pole of sides adjacent
It is identical.
7. recessed multi-diameter shaft device for sealing magnetic fluid according to claim 1, which is characterized in that the gap size is
0.05-5mm。
8. recessed multi-diameter shaft device for sealing magnetic fluid according to claim 1, which is characterized in that outside the split-type pole shoe
Wall is equipped with annular recess, and sealing ring is equipped in the annular recess.
9. recessed multi-diameter shaft device for sealing magnetic fluid according to claim 1, which is characterized in that in single recessed stepped part, most
The first magnetism-isolating loop is respectively equipped on the outside of two pole shoes in outside（4）With the second magnetism-isolating loop（12）.
10. recessed multi-diameter shaft device for sealing magnetic fluid according to claim 1, which is characterized in that the quantity of the bearing is
Two, respectively clutch shaft bearing（3）And second bearing（13）, and it is respectively arranged at the both sides of recessed stepped part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721730596.6U CN207539343U (en) | 2017-12-13 | 2017-12-13 | A kind of recessed multi-diameter shaft device for sealing magnetic fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721730596.6U CN207539343U (en) | 2017-12-13 | 2017-12-13 | A kind of recessed multi-diameter shaft device for sealing magnetic fluid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207539343U true CN207539343U (en) | 2018-06-26 |
Family
ID=62618441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721730596.6U Expired - Fee Related CN207539343U (en) | 2017-12-13 | 2017-12-13 | A kind of recessed multi-diameter shaft device for sealing magnetic fluid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207539343U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112178199A (en) * | 2020-09-10 | 2021-01-05 | 上海宇航系统工程研究所 | Magnetic fluid sealing device adopting threaded connection shaft |
| CN113187897A (en) * | 2021-06-18 | 2021-07-30 | 北京交通大学 | Magnetic liquid seal and labyrinth seal combined sealing device |
-
2017
- 2017-12-13 CN CN201721730596.6U patent/CN207539343U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112178199A (en) * | 2020-09-10 | 2021-01-05 | 上海宇航系统工程研究所 | Magnetic fluid sealing device adopting threaded connection shaft |
| CN113187897A (en) * | 2021-06-18 | 2021-07-30 | 北京交通大学 | Magnetic liquid seal and labyrinth seal combined sealing device |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180626 Termination date: 20181213 |