CN108775304A - A kind of change tooth for hydraulic cylinder becomes gap type magnetic fluid reciprocation sealing structure - Google Patents
A kind of change tooth for hydraulic cylinder becomes gap type magnetic fluid reciprocation sealing structure Download PDFInfo
- Publication number
- CN108775304A CN108775304A CN201810914128.7A CN201810914128A CN108775304A CN 108775304 A CN108775304 A CN 108775304A CN 201810914128 A CN201810914128 A CN 201810914128A CN 108775304 A CN108775304 A CN 108775304A
- Authority
- CN
- China
- Prior art keywords
- pole
- magnetic fluid
- pole shoe
- shell
- hydraulic cylinder
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
-
- 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
The invention discloses a kind of change teeth for hydraulic cylinder to become gap type magnetic fluid reciprocation sealing structure, it is axially spaced in space between piston rod outer surface and inner walls to be equipped with multiple cyclic annular pole shoes, pole shoe inner headed face is equipped with pole tooth, axial charging type permanent-magnetic clamp is folded between two neighboring pole shoe, the polarity of the magnetic pole of adjacent axial charging type permanent-magnetic clamp is opposite, there are gaps between pole tooth and piston rod outer surface, gap location is marked with magnetic fluid, from high-pressure side to low pressure side direction, successively decrease successively in gap between pole tooth and piston rod outer surface, all pole teeth on the same pole shoe are equal with the gap between piston rod outer surface.The present invention is formd a kind of voltage endurance capability and is gradually increased by the variation of structure, and the gradual increased situation of the resistance of magnetic fluid leakage has achieved the effect that further increase the pressure-resistant performance of sealing.
Description
Technical field
The invention belongs to mechanical engineering sealing techniques, and in particular to it is past that a kind of change tooth for hydraulic cylinder becomes gap type magnetic fluid
Multiple sealing structure.
Background technology
The magnetic fluid sealing structure for being currently used for moving back and forth generally comprises the shell with hollow cavity, piston rod, piston rod
Permanent magnet is set between shell and pole shoe carries out magnet fluid sealing, pole shoe inner ring is equipped with pole tooth.
Improve magnetic fluid seal pressure resistance performance method it is general there are two types of：First, it tries every possible means to improve magnetic field intensity；The
Two, increase the saturation magnetization of magnetic fluid.Most of starting points are all to go to consider from improving magnetic field intensity, but existing magnetic current
Body sealing performance is simultaneously imperfect, still there is the space further increased.
In addition, in the Multi-level sealing structure of the prior art, the pole number of teeth amount on each pole shoe is all identical.Inventor tests
It was found that from high-pressure side to low-pressure side, in two neighboring pole shoe, if high-pressure side pole shoe magnet fluid sealing voltage endurance capability is more than adjacent low
Press side magnet fluid sealing voltage endurance capability when, low-pressure side magnet fluid sealing can not work, that is to say, that the sealing of low-pressure side just as
It is illusory.For Multi-level sealing structure, since the magnet fluid sealing of low-pressure side can not play a role, then excessive series is arranged
Pole shoe only will increase the volume of magnetic fluid sealing structure, waste more costs.
Invention content
In view of the above-mentioned problems, the present invention is intended to provide a kind of magnetic fluid sealing structure that can improve the pressure-resistant performance of sealing.
The technical solution that the present invention solves the problems, such as is：A kind of change tooth for hydraulic cylinder becomes gap type magnetic fluid reciprocation sealing knot
Structure, including hollow shell, the shell one end closing, the other end open wide, and are provided with through-hole at the closed end center of shell, also
Include being worn from through-hole to the piston rod of housing cavity, in the space between piston rod outer surface and inner walls in an axial direction between
Every equipped with multiple cyclic annular pole shoes, pole shoe inner headed face is equipped with pole tooth, axial charging type permanent magnetism is folded between two neighboring pole shoe
Ring, the polarity of the magnetic pole of adjacent axial charging type permanent-magnetic clamp is on the contrary, there are gap, gap locations between pole tooth and piston rod outer surface
It is marked with magnetic fluid, from high-pressure side to low pressure side direction, the gap between pole tooth and piston rod outer surface is successively decreased successively, the same pole
All pole teeth on boots are equal with the gap between piston rod outer surface.
Improved structure, is experimentally confirmed, and the gap between pole tooth and piston rod outer surface is smaller, seals resistance to pressure energy
Power is stronger, and entire sealing structure forms a kind of voltage endurance capability and gradually increases, the gradual increased situation of the resistance of magnetic fluid leakage,
Achieve the effect that further increase the pressure-resistant performance of sealing.
Preferably, the decrement in gap is 0.01~0.06mm.
Preferably, the gap size between pole tooth and piston rod outer surface is 0.05~4mm.
Further, from high-pressure side to low pressure side direction, the pole number of teeth amount on pole shoe is incremented by successively.
Above-mentioned further improved scheme makes pole number of teeth amount change, and artificially produces magnetic fluid under the pole shoe of high-pressure side
Sealability is less than magnet fluid sealing ability under low-pressure side pole shoe, it is ensured that does not occur the defect situation described in background technology.
From high-pressure side to low-pressure side, the voltage endurance capability of pole shoe is gradually increasing so that magnet fluid sealing can play work under all pole shoes
With ensure that the pressure-resistant performance of sealing.Moreover, the gap between pole tooth and piston rod outer surface is successively decreased successively also has this effect
Fruit, gap is successively decreased is incremented by two kinds of improved procedures with pole tooth, complements each other, plays effect jointly.
Preferably, the pole number of teeth amount on adjacent pole shoe differs 1 or 2.
Preferably, the pole number of teeth amount on each pole shoe is 1~15.
Further, the saturation magnetization of injected magnetic fluid is identical in gap.
Preferably, the quantity of the pole shoe is 2~20.
Further, the cross section of the pole shoe near the pole shoe at housings close end and near shell open end
Axially extended portion for equal L shapes, and the two pole shoes is oppositely arranged；
The cross section for being located most closely to all pole shoes between housings close end and two pole shoes of open end is T shapes；
The periphery of all pole shoes is abutted with inner walls, and sealing ring is folded between the axially extended portion of adjacent pole shoe；
Axial charging type permanent-magnetic clamp correspondence is embedded in two adjacent pole shoes, the confined space that piston rod and sealing ring surround.
In above-mentioned further improvement, axial charging type permanent-magnetic clamp is embedded between pole shoe, and the pole shoe of both sides will axially fill
Magnetic-type is permanent magnetic ring-shaped at package, and leakage field hardly occurs.
Further, magnetism-isolating loop is equipped between the pole shoe at housings close end and housings close end inner wall；
Pole shoe near shell open end is sealed in housing cavity by end cap compression, and be equipped between the pole shoe and end cap every
Magnet ring.
The present invention remarkable result be：
1. the gap between pole tooth and piston rod outer surface is smaller, sealing voltage endurance capability is stronger, and entire sealing structure forms one
Kind of voltage endurance capability gradually increases, and the gradual increased situation of the resistance of magnetic fluid leakage has reached and further increased sealing resistance to pressure
The effect of energy.
2. by the variation of structure, artificially produces magnet fluid sealing ability under the pole shoe of high-pressure side and be less than under low-pressure side pole shoe
Magnet fluid sealing ability, from high-pressure side to low-pressure side, the voltage endurance capability of pole shoe is gradually increasing so that magnetic fluid is close under all pole shoes
Envelope can play a role, and ensure that the pressure-resistant performance of sealing.
3. axial charging type permanent-magnetic clamp is embedded between pole shoe, the pole shoes of both sides is permanent magnetic ring-shaped at package by axial charging type,
Leakage field hardly occurs.
Description of the drawings
The invention will be further described below in conjunction with the accompanying drawings.
Fig. 1 is present hydraulic cylinder structural schematic diagram.
Fig. 2 is the partial enlarged view of Fig. 1.
Fig. 3 is magnetic fluid sealing structure schematic diagram of the present invention.
In figure：1- piston rods, 2- shells, 3- pole shoes, 4- end caps, 5- magnetism-isolating loops, the poles 6- tooth, 7- axial charging type permanent magnetism
Ring, 8- sealing rings, 9- cylinder bodies, 10- nuts, 11- piston heads, the axially extended portions 31-.
Specific implementation mode
As shown in Figs. 1-3, a kind of change tooth for hydraulic cylinder becomes gap type magnetic fluid reciprocation sealing structure, including hollow shell
Body 2, the closing of 2 one end of the shell, the other end open wide.It is provided with through-hole at the closed end center of shell 2.Further include being worn from through-hole
If to the piston rod 1 of 2 inner cavity of shell.
It is axially spaced in space between 2 inner wall of 1 outer surface of piston rod and shell to be equipped with multiple cyclic annular pole shoes 3.Pole
3 inner headed face of boots is equipped with pole tooth 6.Axial charging type permanent-magnetic clamp 7 is folded between two neighboring pole shoe 3.
The cross section of pole shoe 3 near 2 blind end of shell and the pole shoe 3 near 2 open end of shell is equal L
Shape, and the axially extended portion 31 of the two pole shoes 3 is oppositely arranged.It is located most closely to two poles of 2 blind end of shell and open end
The cross section of all pole shoes 3 between boots 3 is T shapes.The periphery of all pole shoes 3 is abutted with 2 inner wall of shell.Adjacent pole shoe 3
Sealing ring 8 is folded between axially extended portion 31.The correspondence of axial charging type permanent-magnetic clamp 7 is embedded in two adjacent pole shoes 3, lives
The confined space that stopper rod 1 and sealing ring 8 surround.The polarity of the magnetic pole of adjacent axial charging type permanent-magnetic clamp 7 is opposite.
Magnetism-isolating loop 5 is equipped between the 2 blind end inner wall of pole shoe 3 and shell of 2 blind end of shell.
Pole shoe 3 near 2 open end of shell is sealed in 2 inner cavity of shell, and the pole shoe 3 and end cap 4 by the compression of end cap 4
Between be equipped with magnetism-isolating loop 5.
There are gaps between 1 outer surface of pole tooth 6 and piston rod.Gap size is preferably 0.05~4mm.From high-pressure side to low
Side direction, the gap between 1 outer surface of pole tooth 6 and piston rod is pressed to successively decrease successively, all pole teeth 6 on the same pole shoe 3 and work
Gap between 1 outer surface of stopper rod is equal.The decrement in gap is 0.01~0.06mm.Gap location is marked with magnetic fluid.In gap
The saturation magnetization of injected magnetic fluid is identical.
From high-pressure side to low pressure side direction, 3 width of the pole shoe is incremented by successively, and 6 quantity of pole tooth on pole shoe 3 is passed successively
Increase.6 quantity of pole tooth on adjacent pole shoe 3 differs 1 or 2.The quantity of the pole shoe 3 is preferably 2~20.Each pole shoe 3
On 6 quantity of pole tooth be preferably 1~15.
Hydraulic cylinder includes cylinder body 9.9 inner cavity one end of cylinder body is equipped with internal thread.2 outer surface of the shell is equipped with screw thread, shell 2
It is fixedly installed on 9 inner cavity one end of cylinder body by screw-thread fit.The piston rod 1 passes through 2 inner cavity of shell and is inserted into 9 inner cavity of cylinder body,
2 front end of piston rod is fixedly connected by nut 10 with piston head 11.
Claims (10)
1. a kind of change tooth for hydraulic cylinder becomes gap type magnetic fluid reciprocation sealing structure, including hollow shell（2）, the shell
（2）One end closing, the other end open wide, in shell（2）Closed end center be provided with through-hole, further include being worn from through-hole to shell
（2）The piston rod of inner cavity（1）, in piston rod（1）Outer surface and shell（2）It is axially spaced equipped with more in space between inner wall
A ring-type pole shoe（3）, pole shoe（3）Inner headed face is equipped with pole tooth（6）, two neighboring pole shoe（3）Between be folded with axial charging type
Permanent-magnetic clamp（7）, adjacent axial charging type permanent-magnetic clamp（7）Magnetic pole polarity on the contrary, pole tooth（6）With piston rod（1）Outer surface it
Between there are gaps, gap location to be marked with magnetic fluid, it is characterised in that：From high-pressure side to low pressure side direction, pole tooth（6）With piston rod
（1）Gap between outer surface is successively decreased successively, the same pole shoe（3）On all pole teeth（6）With piston rod（1）Between outer surface
Gap it is equal.
2. the change tooth according to claim 1 for hydraulic cylinder becomes gap type magnetic fluid reciprocation sealing structure, it is characterised in that：
The decrement in gap is 0.01~0.06mm.
3. the change tooth according to claim 2 for hydraulic cylinder becomes gap type magnetic fluid reciprocation sealing structure, it is characterised in that：
Pole tooth（6）With piston rod（1）Gap size between outer surface is 0.05~4mm.
4. the change tooth according to claims 1 to 3 any one of them for hydraulic cylinder becomes gap type magnetic fluid reciprocation sealing structure,
It is characterized in that：From high-pressure side to low pressure side direction, pole shoe（3）On pole tooth（6）Quantity is incremented by successively.
5. the change tooth according to claim 4 for hydraulic cylinder becomes gap type magnetic fluid reciprocation sealing structure, it is characterised in that：
Adjacent pole shoe（3）On pole tooth（6）Quantity differs 1 or 2.
6. the change tooth according to claim 4 for hydraulic cylinder becomes gap type magnetic fluid reciprocation sealing structure, it is characterised in that：
Each pole shoe（3）On pole tooth（6）Quantity is 1~15.
7. the change tooth according to claim 1 for hydraulic cylinder becomes gap type magnetic fluid reciprocation sealing structure, it is characterised in that：
The saturation magnetization of injected magnetic fluid is identical in gap.
8. the change tooth according to claim 1 for hydraulic cylinder becomes gap type magnetic fluid reciprocation sealing structure, it is characterised in that：
The pole shoe（3）Quantity be 2~20.
9. the change tooth according to claim 1 for hydraulic cylinder becomes gap type magnetic fluid reciprocation sealing structure, feature exists
In：Near shell（2）The pole shoe of blind end（3）And near shell（2）The pole shoe of open end（3）Cross section be equal L
Shape, and the two pole shoes（3）Axially extended portion（31）It is oppositely arranged；
It is located most closely to shell（2）Two pole shoes of blind end and open end（3）Between all pole shoes（3）Cross section be T
Shape；
All pole shoes（3）Periphery and shell（2）Inner wall abuts, adjacent pole shoe（3）Axially extended portion（31）Between sandwiched
There is sealing ring（8）；
The axial charging type permanent-magnetic clamp（7）Correspondence is embedded in two adjacent pole shoes（3）, piston rod（1）And sealing ring（8）It surrounds
Confined space.
10. the change tooth according to claim 1 for hydraulic cylinder becomes gap type magnetic fluid reciprocation sealing structure, feature exists
In：Near shell（2）The pole shoe of blind end（3）With shell（2）Magnetism-isolating loop is equipped between blind end inner wall（5）；
Near shell（2）The pole shoe of open end（3）Pass through end cap（4）Compression is sealed in shell（2）Inner cavity, and the pole shoe（3）
With end cap（4）Between be equipped with magnetism-isolating loop（5）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810914128.7A CN108775304B (en) | 2018-08-13 | 2018-08-13 | Variable-tooth and variable-gap magnetic fluid reciprocating sealing structure for hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810914128.7A CN108775304B (en) | 2018-08-13 | 2018-08-13 | Variable-tooth and variable-gap magnetic fluid reciprocating sealing structure for hydraulic cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108775304A true CN108775304A (en) | 2018-11-09 |
| CN108775304B CN108775304B (en) | 2023-05-02 |
Family
ID=64029313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810914128.7A Active CN108775304B (en) | 2018-08-13 | 2018-08-13 | Variable-tooth and variable-gap magnetic fluid reciprocating sealing structure for hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108775304B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0183477A2 (en) * | 1984-11-20 | 1986-06-04 | Ferrofluidics Corporation | Coaxial, multiple-shaft ferrofluid seal apparatus |
| JPH05196149A (en) * | 1992-01-21 | 1993-08-06 | Tokyo Electron Ltd | Magnetic fluid seal device |
| JPH08320083A (en) * | 1995-05-24 | 1996-12-03 | Rigaku Corp | Magnetic seal device |
| CN103939618A (en) * | 2014-04-29 | 2014-07-23 | 北京交通大学 | Magnetic liquid sealing device for porous pole shoes |
| CN106151526A (en) * | 2016-08-15 | 2016-11-23 | 广西科技大学 | A kind of split-type labyrinth type device for sealing magnetic fluid |
| CN206290714U (en) * | 2016-12-09 | 2017-06-30 | 北京交通大学 | A kind of high linear speed spin magnetization liquid sealing device of radial direction small size |
-
2018
- 2018-08-13 CN CN201810914128.7A patent/CN108775304B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0183477A2 (en) * | 1984-11-20 | 1986-06-04 | Ferrofluidics Corporation | Coaxial, multiple-shaft ferrofluid seal apparatus |
| JPH05196149A (en) * | 1992-01-21 | 1993-08-06 | Tokyo Electron Ltd | Magnetic fluid seal device |
| JPH08320083A (en) * | 1995-05-24 | 1996-12-03 | Rigaku Corp | Magnetic seal device |
| CN103939618A (en) * | 2014-04-29 | 2014-07-23 | 北京交通大学 | Magnetic liquid sealing device for porous pole shoes |
| CN106151526A (en) * | 2016-08-15 | 2016-11-23 | 广西科技大学 | A kind of split-type labyrinth type device for sealing magnetic fluid |
| CN206290714U (en) * | 2016-12-09 | 2017-06-30 | 北京交通大学 | A kind of high linear speed spin magnetization liquid sealing device of radial direction small size |
Non-Patent Citations (1)
| Title |
|---|
| 孙明礼;李德才;崔海蓉;何新智;: "磁流体密封的磁场数值分析", 北京交通大学学报 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108775304B (en) | 2023-05-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108799504A (en) | A kind of high pressure-resistant magnetic fluid rotary seal structure | |
| CN105570466B (en) | A kind of symmetric form staged magnetic fluid seal device | |
| CN108980360A (en) | A kind of magnetic source parallel connection type magnetic fluid sealing structure | |
| CN109027249A (en) | A kind of magnetic fluid sealing structure with dentation magnetic source | |
| CN208669741U (en) | A kind of change tooth change gap type magnetic fluid reciprocation sealing structure for hydraulic cylinder | |
| CN106015360B (en) | A kind of labyrinth type device for sealing magnetic fluid | |
| CN105387213A (en) | Magnetic liquid and mechanical seal combined sealing device applied to nuclear reactor main pump seal | |
| CN106151526A (en) | A kind of split-type labyrinth type device for sealing magnetic fluid | |
| CN109505985A (en) | A kind of hydraulic cylinder magnetic fluid reciprocating sealing device | |
| CN108869752B (en) | Tooth-variable and gap-variable mixed type magnetic fluid sealing structure for hydraulic cylinder | |
| CN105416815A (en) | Storage device for collecting neodymium-iron-boron magnetic powder | |
| CN108775304A (en) | A kind of change tooth for hydraulic cylinder becomes gap type magnetic fluid reciprocation sealing structure | |
| CN203670884U (en) | Hard seal ball valve with trapezoid graphite seal rings | |
| CN102588610B (en) | Hydraulic cylinder with sealing follow-up device | |
| CN108825790B (en) | A kind of magnetic source increment type magnetic fluid sealing structure | |
| CN207569210U (en) | A kind of reciprocating motion magnetic fluid sealing structure | |
| CN108980358A (en) | A kind of ladder pole flute profile magnetic fluid sealing structure | |
| CN108843791B (en) | Tandem type magnetic fluid sealing structure | |
| CN208670069U (en) | A kind of high pressure-resistant magnetic fluid rotary seal structure | |
| CN108980359B (en) | Magnetic fluid sealing structure | |
| CN108980357A (en) | A kind of hybrid magnetic fluid sealing structure | |
| CN208793629U (en) | A kind of embedded tandem type multi-diameter shaft device for sealing magnetic fluid of magnetic source | |
| CN207598931U (en) | One kind is sealed from jam type packing | |
| CN203098075U (en) | Sealing structure of air cylinder cover and air cylinder sleeve of engine | |
| CN204458253U (en) | For Reciprocting piston compressor gland sealed pressure-reducing ring and filler assembly thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |