CN104405886A - Method for improving pressure resistance of magnetic liquid seal in low-temperature working environment - Google Patents
Method for improving pressure resistance of magnetic liquid seal in low-temperature working environment Download PDFInfo
- Publication number
- CN104405886A CN104405886A CN201410690942.7A CN201410690942A CN104405886A CN 104405886 A CN104405886 A CN 104405886A CN 201410690942 A CN201410690942 A CN 201410690942A CN 104405886 A CN104405886 A CN 104405886A
- Authority
- CN
- China
- Prior art keywords
- low
- magnetic liquid
- alloy steel
- ferromagnetic material
- liquid seal
- 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
Links
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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention provides a method for improving pressure resistance of magnetic liquid seal in a low-temperature working environment, belongs to the technical field of sealing of mechanism engineering, and in particular applies to magnetic liquid seal. The method comprises the steps of selecting a ferromagnetic material with high permeability and large expansion coefficient, and an alloy steel material with small thermal expansion coefficient and high comprehensive mechanical performance; manufacturing a pole shoe with the ferromagnetic material; manufacturing and processing a composite material shaft being 50 to 100mm in diameter by using the ferromagnetic material and the alloy steel material as an outer layer material and an inner layer material, respectively, wherein the radial length ratio of the ferromagnetic material layer to the alloy steel material layer is 1: 3; applying the pole shoe and the composite material shaft into a magnetic liquid seal device of which a gap ranges from 0.1 to 0.25. With the adoption of the method, the shortages of the existing method for magnetic liquid seal under a low temperature can be overcome, the problem of applying to magnetic liquid seal in a low-temperature environment is solved, the applicable scope of magnetic liquid seal is expanded, and the method is of an important significance.
Description
Technical field
The invention belongs to mechanical engineering technical field of sealing technology, be specially adapted to magnetic fluid sealing.
Background technique
Magnetic fluid sealing has zero leakage, the long lifetime, high reliability, the advantage such as not to pollute, is thus widely used in fields such as machinery, aviation, chemical industry.In magnetic fluid seal device, the seal clearance that the pole shoe be usually directed to and axle are formed is between 0.1 ~ 0.5mm.Under magnetic fields, magnetic liquid is filled in seal clearance.The pole shoe that in magnetic fluid sealing, conventional permanent magnet and the higher ferromagnetic material of permeability manufacture, rotating shaft form magnetic circuit.Along with the development in the field such as Aero-Space, military project, more and more higher requirement is proposed to sealing, such as these fields usually require that magnetic liquid long-term work is in low temperature environment, and some working temperature is changed significantly, such as certain the equipment working environment temperature difference is maximum reaches 100 DEG C.The viscosity of magnetic liquid is by great changes will take place at low temperatures, adds the diameter of axle greatly, makes running shaft starting torque excessive, had a strong impact on the application of magnetic fluid sealing in low temperature field.Increase magnetic fluid sealing voltage endurance capability, can reduce to seal progression, thus effectively reduce starting torque.Therefore ensure that the voltage endurance capability of magnetic fluid sealing under low-temperature working environment and reliability just become problem in the urgent need to address.
Magnetic fluid sealing voltage endurance capability increases with the reduction in gap, and when magnetic fluid sealing gap is between 0.1 ~ 0.25mm, voltage endurance capability is very sensitive to seal clearance change.The character that the present invention is expanded with heat and contract with cold according to material, proposes a kind of method improving magnetic fluid sealing voltage endurance capability in low-temperature working environment.Can in low temperature environment, reduce magnetic fluid sealing gap, greatly enhance the voltage endurance capability under cryogenic conditions and reliability, obtain good effect in practice, to solving the use problem of magnetic fluid sealing in low temperature environment and widening the application range of magnetic fluid sealing, have great importance.
Summary of the invention
Technical problem to be solved by this invention is:
Magnetic fluid sealing requires to have higher voltage endurance capability under cryogenic, and existing magnetic fluid sealing method effectively can not improve the voltage endurance capability of magnetic liquid at low temperatures.Therefore, provide a kind of method improving magnetic fluid sealing voltage endurance capability in low-temperature working environment, make up the deficiency of existing low temperature magnetic hydraulic seal method, and the raising voltage endurance capability of the degree that can vary in size according to the temperature difference, practical requirement.
Technological scheme of the present invention:
Improve a method for magnetic fluid sealing voltage endurance capability in low-temperature working environment, the method comprises the following steps:
Step one: select a kind of permeability high and the ferromagnetic material that expansion coefficient is large and the little and alloy steel material that comprehensive mechanical performance is good of a kind of thermal expansion coefficient.
Step 2: be processed into the composite shaft of diameter range 50 ~ 100mm respectively as outer and inner layer material with this ferromagnetic material selected in step one and alloy steel material.
Step 3: make pole shoe with the ferromagnetic material selected in step one, coordinate with the composite shaft of processing in step 2.
Step 4: composite shaft step 2 and step 3 made becomes magnetic fluid seal device inject magnetic liquid and be applied to low temperature environment with pole shoe with other Assembly of the parts.Wherein permanent magnet, axle outer section, pole shoe, magnetic liquid form magnetic loop.
Described magnetic fluid sealing interstice coverage is at 0.1 ~ 0.25mm.
The inner ferromagnetic material layers of described composite shaft and alloy steel products bed of material radial length are pressed 1:3 and are distributed.
Described low-temperature working environment refers to-200 DEG C ~-40 DEG C.
Described magnetic fluid sealing comprises static seal and motive sealing.
Beneficial effect of the present invention:
And ferromagnetic material that expansion coefficient large high with permeability makes pole shoe, and is processed into composite shaft respectively as outer and inner layer material radial length by 1:3 distribution manufacture with this ferromagnetic material and alloy steel material.By this axle and pole shoe under cryogenic with the use of rear, pole shoe and axle all can produce contraction.Because internal layer adopts linear expansion coeffcient primary alloy steel to limit the contraction of axle, the contour projector of composite shaft will be significantly less than pole shoe contour projector, and seal clearance reduces, and magnetic fluid sealing voltage endurance capability significantly improves.Seal clearance reduces with temperature and reduces, and the temperature difference larger magnetic fluid sealing voltage endurance capability is stronger, the raising voltage endurance capability of degree so this method can vary in size according to the temperature difference.The present invention compensate for the deficiency of existing low temperature magnetic hydraulic seal method, to solving the use problem of magnetic fluid sealing in low temperature environment and widening the application range of magnetic fluid sealing, has great importance.
Accompanying drawing explanation
Fig. 1 is this encapsulating method schematic diagram.
Fig. 2 different situations magnetic hydraulic seal gapped alignments schematic diagram.
In figure: adopt encapsulating method gap L 3 of the present invention under adopting conventional sealing method gap L 2, low temperature under normal temperature under gap L 1, low temperature.
Fig. 3 is magnetic fluid seal device structural drawing.
Embodiment
Mode of execution one
Select 45 Steel materials and 40Cr13 material, pole shoe is made with 45 steels, be processed into the composite shaft of diameter range 100mm with this 45 steel and 40Cr13 respectively as outer and inner layer material manufacture, wherein the 45 steel bed of materials and 40Cr13 material layer radial length press 1:3 distribution.Composition gap is coordinated to be the magnetic fluid seal device of 0.2mm pole shoe and composite shaft.By this application of installation under the cryogenic conditions of-190, the magnetic fluid seal device gap all using 45 steels to do than pole shoe and axle reduces 0.011mm.
Mode of execution two
Select 45 Steel materials and 30Cr13 material, make pole shoe with 45 steels, be processed into the composite shaft of diameter 80mm with this 45 steel and 30Cr17 respectively as outer and inner layer material manufacture, wherein the 45 steel bed of materials and 30Cr17 material layer radial length press 1:3 distribution.Composition gap is coordinated to be the magnetic fluid seal device of 0.1mm pole shoe and composite shaft.By this application of installation under the cryogenic conditions of-100, the magnetic fluid seal device gap all using 45 steels to do than pole shoe and axle reduces 0.005mm.
Claims (4)
1. improve a method for magnetic fluid sealing voltage endurance capability in low-temperature working environment, it is characterized in that: the method comprises the following steps:
Step one: select a kind of permeability high and the ferromagnetic material that expansion coefficient is large and the little and alloy steel material that comprehensive mechanical performance is good of a kind of thermal expansion coefficient.
Step 2: be processed into the composite shaft of diameter range 50 ~ 100mm respectively as outer and inner layer material with this ferromagnetic material selected in step one and alloy steel material.
Step 3: make pole shoe with the ferromagnetic material selected in step one, coordinate with the composite shaft of processing in step 2.
Step 4: composite shaft step 2 and step 3 made becomes magnetic fluid seal device inject magnetic liquid and be applied to low temperature environment with pole shoe with other Assembly of the parts.Wherein permanent magnet, axle outer section, pole shoe, magnetic liquid form magnetic loop.
2. a kind of method improving magnetic fluid sealing voltage endurance capability in low-temperature working environment according to claim 1, is characterized in that: magnetic fluid sealing interstice coverage is at 0.1 ~ 0.25mm.
3. a kind of method improving magnetic fluid sealing voltage endurance capability in low-temperature working environment according to claim 1, is characterized in that: make a kind of by ferromagnetic material and alloy steel material respectively as composite shaft that is outer and inner layer material.
4. according to claim 3 a kind of by ferromagnetic material and alloy steel material respectively as composite shaft that is outer and inner layer material, it is characterized in that: composite shaft inside ferromagnetic material layers and alloy steel products bed of material radial length distribute by 1:3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410690942.7A CN104405886A (en) | 2014-11-26 | 2014-11-26 | Method for improving pressure resistance of magnetic liquid seal in low-temperature working environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410690942.7A CN104405886A (en) | 2014-11-26 | 2014-11-26 | Method for improving pressure resistance of magnetic liquid seal in low-temperature working environment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104405886A true CN104405886A (en) | 2015-03-11 |
Family
ID=52643537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410690942.7A Pending CN104405886A (en) | 2014-11-26 | 2014-11-26 | Method for improving pressure resistance of magnetic liquid seal in low-temperature working environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104405886A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092143A (en) * | 2015-07-27 | 2015-11-25 | 北京交通大学 | Wide-range magnetic-liquid micro differential pressure sensor |
| 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 |
| CN107956880A (en) * | 2017-12-13 | 2018-04-24 | 广西科技大学 | A kind of magnetic fluid sealing structure |
| CN108612850A (en) * | 2018-05-08 | 2018-10-02 | 清华大学 | A kind of magnetic fluid-lip packing composite seal |
| CN112178203A (en) * | 2020-10-21 | 2021-01-05 | 清华大学 | Magnetic liquid sealing device |
| CN113536637A (en) * | 2021-07-20 | 2021-10-22 | 北京交通大学 | Magnetic liquid sealing pressure resistance analysis method based on MATLAB and COMSOL combined simulation |
| CN114294423A (en) * | 2021-12-10 | 2022-04-08 | 清华大学 | Magnetic liquid sealing device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58124866A (en) * | 1982-01-19 | 1983-07-25 | Nippon Telegr & Teleph Corp <Ntt> | Magnetic fluid seal |
| JPS6049169A (en) * | 1983-08-13 | 1985-03-18 | Tohoku Metal Ind Ltd | Sealing arrangement |
| JPH0771620A (en) * | 1993-06-11 | 1995-03-17 | Nippon Seiko Kk | Magnetic fluid seal device |
| CN102128271A (en) * | 2011-01-16 | 2011-07-20 | 北京交通大学 | Magnetic liquid sealing device capable of microwave heating |
| CN103557335A (en) * | 2013-11-11 | 2014-02-05 | 北京交通大学 | Inflatable magnetic liquid rotating seal device |
| RU2529275C1 (en) * | 2013-07-12 | 2014-09-27 | Открытое акционерное общество "Уфимское моторостроительное производственное объединение" ОАО "УМПО" | Magnetic fluid shaft seal |
-
2014
- 2014-11-26 CN CN201410690942.7A patent/CN104405886A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58124866A (en) * | 1982-01-19 | 1983-07-25 | Nippon Telegr & Teleph Corp <Ntt> | Magnetic fluid seal |
| JPS6049169A (en) * | 1983-08-13 | 1985-03-18 | Tohoku Metal Ind Ltd | Sealing arrangement |
| JPH0771620A (en) * | 1993-06-11 | 1995-03-17 | Nippon Seiko Kk | Magnetic fluid seal device |
| CN102128271A (en) * | 2011-01-16 | 2011-07-20 | 北京交通大学 | Magnetic liquid sealing device capable of microwave heating |
| RU2529275C1 (en) * | 2013-07-12 | 2014-09-27 | Открытое акционерное общество "Уфимское моторостроительное производственное объединение" ОАО "УМПО" | Magnetic fluid shaft seal |
| CN103557335A (en) * | 2013-11-11 | 2014-02-05 | 北京交通大学 | Inflatable magnetic liquid rotating seal device |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092143A (en) * | 2015-07-27 | 2015-11-25 | 北京交通大学 | Wide-range magnetic-liquid micro differential pressure sensor |
| CN105092143B (en) * | 2015-07-27 | 2017-08-08 | 北京交通大学 | A kind of wide range magnetic-liquid micro differential pressure sensor |
| 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 |
| CN107956880A (en) * | 2017-12-13 | 2018-04-24 | 广西科技大学 | A kind of magnetic fluid sealing structure |
| CN107956880B (en) * | 2017-12-13 | 2019-08-09 | 广西科技大学 | A kind of magnetic fluid sealing structure |
| CN108612850A (en) * | 2018-05-08 | 2018-10-02 | 清华大学 | A kind of magnetic fluid-lip packing composite seal |
| CN108612850B (en) * | 2018-05-08 | 2020-07-28 | 清华大学 | Magnetic fluid-lip seal composite seal |
| CN112178203A (en) * | 2020-10-21 | 2021-01-05 | 清华大学 | Magnetic liquid sealing device |
| US11193592B1 (en) | 2020-10-21 | 2021-12-07 | Tsinghua University | Magnetic fluid sealing device |
| CN113536637A (en) * | 2021-07-20 | 2021-10-22 | 北京交通大学 | Magnetic liquid sealing pressure resistance analysis method based on MATLAB and COMSOL combined simulation |
| CN114294423A (en) * | 2021-12-10 | 2022-04-08 | 清华大学 | Magnetic liquid sealing device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104405886A (en) | Method for improving pressure resistance of magnetic liquid seal in low-temperature working environment | |
| CN103343822B (en) | Be applicable to the magnetic liquid rotating sealing device of space station | |
| CN103791096A (en) | Seal ring | |
| CN103148220A (en) | Magnetic liquid rotary sealing device | |
| CN105387213A (en) | Magnetic liquid and mechanical seal combined sealing device applied to nuclear reactor main pump seal | |
| CN203784246U (en) | Sealing structure for wind turbine gearbox | |
| CN103335108B (en) | A kind of magnetic liquid rotating sealing device | |
| CN103603954A (en) | Dynamical sealing system with heavy caliber in vacuum and low temperature environment | |
| CN203463678U (en) | High-temperature high-pressure bidirectional metal hard sealing butterfly valve | |
| CN104696529A (en) | Method for improving pressure-resistant capacity and working reliability of magnetic fluid seal in high-temperature working environment | |
| CN204852354U (en) | New installation of sealed heat transfer of reinforcing magnetic fluid | |
| CN204900817U (en) | Combined seal ring floats | |
| CN204372179U (en) | A kind of device improving high linear speed and stationary magnetic hydraulic seal life-span | |
| CN103363071B (en) | A kind of wind turbine gearbox planetary stage lubrication sealing configuration | |
| CN202900747U (en) | Mechanical seal device capable of enabling cooling liquid to be added | |
| CN203940038U (en) | Solenoid directional control valve and valve auxiliary structure | |
| CN104455431B (en) | A kind of alloy seal circle | |
| CN203670798U (en) | Magnetic fluid sealing optical device capable of conducting rotation and axial reciprocating motion | |
| CN106812948A (en) | The variable magnetic fluid seal device of seal clearance | |
| CN203948678U (en) | The box-like sealing configuration of a kind of valve sets | |
| CN203162153U (en) | Stair-shaped sealing piece and stair-shaped coaxial sealing piece | |
| CN202646855U (en) | Novel high-pressure large-diameter all-welded ball valve | |
| CN203348559U (en) | All-metal magnetic fluid sealing device | |
| CN103062564B (en) | A kind of method improving pipeline compensator stuffing box packing uniformity | |
| CN204186604U (en) | A kind of corrosion-resistant magnetic drive pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150311 |