CN108612850A - A kind of magnetic fluid-lip packing composite seal - Google Patents

A kind of magnetic fluid-lip packing composite seal Download PDF

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Publication number
CN108612850A
CN108612850A CN201810433395.2A CN201810433395A CN108612850A CN 108612850 A CN108612850 A CN 108612850A CN 201810433395 A CN201810433395 A CN 201810433395A CN 108612850 A CN108612850 A CN 108612850A
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CN
China
Prior art keywords
lip
pole shoe
magnetic
metal
metal shaft
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
Application number
CN201810433395.2A
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Chinese (zh)
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CN108612850B (en
Inventor
郭飞
姜炳岐
贾晓红
李德才
王子羲
李永健
黄伟峰
王玉明
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Tsinghua University
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Tsinghua University
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Publication date
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Priority to CN201810433395.2A priority Critical patent/CN108612850B/en
Publication of CN108612850A publication Critical patent/CN108612850A/en
Priority to PCT/CN2018/114447 priority patent/WO2019214194A1/en
Application granted granted Critical
Publication of CN108612850B publication Critical patent/CN108612850B/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/16Sealings between relatively-moving surfaces
    • F16J15/40Sealings between relatively-moving surfaces by means of fluid
    • F16J15/43Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J15/00Sealings
    • F16J15/16Sealings between relatively-moving surfaces
    • F16J15/32Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3224Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip capable of accommodating changes in distances or misalignment between the surfaces, e.g. able to compensate for defaults of eccentricity or angular deviations

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Abstract

A kind of magnetic fluid lip packing composite seal, it include the metal shaft on shell, the metal pole shoe for sealing is equipped between metal shaft and shell, permanent magnet is installed among metal pole shoe, metal pole shoe is fixed with lip magnetic rubber on the contact of metal shaft primary sealing area side, the magnetic fluid seal around lip magnetic rubber is realized in lip magnetic rubber and metal shaft cooperation, it is provided with groove between metal pole shoe and shell, there are O-ring seals, O-ring seals to realize metal pole shoe and housing seal in groove;Permanent magnet, metal pole shoe, lip magnetic rubber and metal shaft collectively form closed magnetic loop, can be replenished in time when lip is worn;The present invention can overcome the material loss brought by fretting wear and the leakage thereby resulted in, and can be used in higher liquid pressure environment.

Description

A kind of magnetic fluid-lip packing composite seal
Technical field
The present invention relates to a kind of sealing structure, more particularly to a kind of magnetic fluid-lip packing composite seal.
Background technology
The seal member of mechanical equipment is its normal, stable and safe handling important feature of guarantee, once sealing structure It fails, not only results in a large amount of losses of working media and lubricating fluid, the pollution of environment can be also caused because of leakage, it is rotten Lose equipment and working environment, more it is serious can also therefore explosion of catching fire, cause personal, equipment safety accident.Therefore, for The research of sealing technique is the emphasis of current development of manufacturing.
Lip-type packing is as a kind of rubber and plastic moving sealing element of classics, because its is simple in structure, compact, dependable performance, and energy It enough realizes " zero leakage " on definite meaning, and has extensive adaptability, and as one of most common sealing element.But with The shortcomings that development of modern technologies, traditional lip packing and limitation gradually appear.Because its lip portion needs to protect with rotary shaft It holds and contacts and there is certain axial force to cause sealing ring and rotary shaft so will necessarily have friction torque during the work time Abrasion, and generate energy loss.And with the increase of wear extent, gradually failure leads to the generation leaked to lip envelope.
Response characteristic of the magnetic fluid to magnetic field is utilized as a kind of novel seal form in magnetic fluid seal, can be with Realize zero leakage.Magnetic fluid seal has wide range of applications, and seal compatibility is strong, and using stabilization, long lifespan is pollution-free, It comes into operation in more and more occasions.But there is also its limitations, i.e. magnetic fluid to be difficult to bear for magnetic fluid seal simultaneously Higher pressure difference, this feature limit the development and application of magnetic fluid seal to a certain extent.
Invention content
In order to overcome the above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of magnetic fluid-lip packing Composite seal can overcome the material loss brought by fretting wear and the leakage thereby resulted in, and can be higher Liquid pressure environment in use.
To achieve the goals above, the technical solution adopted by the present invention is:
A kind of magnetic fluid-lip packing composite seal includes the metal shaft 7 on shell 6,7 He of metal shaft It is equipped with the metal pole shoe 1 for sealing between shell 6, permanent magnet 2 is installed among metal pole shoe 1, metal pole shoe 1 is close to metal Lip magnetic rubber 3 is fixed on 7 primary sealing area side contact of axis, lip magnetic is realized in lip magnetic rubber 3 and the cooperation of metal shaft 7 Property rubber 3 around magnetic fluid 4 seal, groove is provided between metal pole shoe 1 and shell 6, there is O-ring seals 5 in groove, O-ring seals 5 realize that metal pole shoe 1 and shell 6 seal.
Permanent magnet 2, metal pole shoe 1, lip magnetic rubber 3 and the metal shaft 7 collectively forms closed magnetic loop, works as lip Mouth can be replenished in time when wearing.
Spacing between the metal pole shoe 1 and metal shaft 7 is more than the range of 7 circular runout of metal shaft.
The lip magnetic rubber 3 is asymmetric triangular structure, and the inclination angle of inside is more than outer angle of heel.
3 material of lip magnetic rubber is that the nano magnetic particle coated using coupling agent is prepared.
Beneficial effects of the present invention are:
The present invention collectively forms closed magnetic loop by permanent magnet 2, metal pole shoe 1, lip magnetic rubber 3 and metal shaft 7, Ensure that magnetic fluid 4 is distributed near the lip for needing to seal lip magnetic rubber 3, can be mended in time when lip is worn It fills.
Compared with prior art, what the present invention solved that magnetic fluid seal cannot use in higher differential pressure environment lacks It falls into, the magnetic fluid of lip portion can compensate the gap that lip envelope abrasion generates automatically, voluntarily search out minimum clearance and ensure non-connect Touch seals, and realizes zero leakage.
Description of the drawings
Fig. 1 is the overall structure diagram of the present invention.
Fig. 2 is that permanent magnet 2, metal pole shoe 1, lip magnetic rubber 3 and metal shaft 7 collectively form closed magnetic loop signal Figure.
Specific implementation mode
The present invention is described in further details with reference to the accompanying drawings and examples.
Referring to Fig.1, a kind of magnetic fluid-lip packing composite seal includes the metal shaft 7 on shell 6, gold Belong to the metal pole shoe 1 being equipped between axis 7 and shell 6 for sealing, permanent magnet 2, metal pole shoe 1 are installed among metal pole shoe 1 It is fixed with lip magnetic rubber 3 on 7 primary sealing area side contact of metal shaft, lip magnetic rubber 3 and metal shaft 7 coordinate reality Magnetic fluid 4 around existing lip magnetic rubber 3 seals, and to ensure that secondary sealing area does not leak, is conveniently adjusted metal pole shoe 1 Radial position, groove is provided between metal pole shoe 1 and shell 6, has O-ring seals 5, O-ring seals 5 to realize gold in groove Belong to pole shoe 1 and shell 6 seals.
With reference to Fig. 2, the permanent magnet 2, metal pole shoe 1, lip magnetic rubber 3 and metal shaft 7 collectively form closed magnetic Circuit ensures that magnetic fluid 4 is distributed near the lip for needing to seal lip magnetic rubber 3, when lip is worn energy and When supplement.
Permanent magnet 2, metal pole shoe 1, lip magnetic rubber 3 and the metal shaft 7 collectively forms closed magnetic loop, works as lip Mouth can be replenished in time when wearing.
Spacing between the metal pole shoe 1 and metal shaft 7 is more than the range of 7 circular runout of metal shaft.
The lip magnetic rubber 3 is asymmetric triangular structure, and the inclination angle of inside is more than outer angle of heel.
3 material of lip magnetic rubber is that the nano magnetic particle coated using coupling agent is prepared.
The operation principle of the present invention is that:When work, 3 lip of lip magnetic rubber on 1 contact of metal pole shoe occurs reversed Pump action, play barrier internal actions medium sealing function, at this point, magnetic fluid 4 by permanent magnet 2, metal pole shoe 1, The effect for the magnetic loop that lip magnetic rubber 3 and metal shaft 7 collectively form is gathered in around 1 contact of metal pole shoe;When lip magnetic Property 3 lip of rubber is due to abrasion and when there is gap, the magnetic field intensity bigger in this gap, therefore magnetic fluid 4 is by magnetic field Effect can rapidly be gathered in newly generated gap, fill up due to lip magnetic rubber 3 wear may caused by leak, lip Magnetic rubber 3 and the supplement of abrasion and magnetic fluid 4 progressively reach balance, are automatically found the minimum clearance of the sealing of magnetic fluid 4, Realize the sealing structure of safety and stability.
Common magnetic fluid seal is limited by axis bounce, need to reserve between pole shoe and axis larger gap to prevent It only rubs, this severely limits the adaptable maximum pressures of magnetic fluid seal, and the present invention can be ground with self compensation in material The hydraulic seal under higher pressure environment is realized in gap caused by damage.

Claims (5)

1. a kind of magnetic fluid-lip packing composite seal, including the metal shaft (7) that is mounted on shell (6), metal shaft (7) the metal pole shoe (1) for sealing is equipped between shell (6), it is characterised in that:It is equipped with forever among metal pole shoe (1) Magnet (2), metal pole shoe (1) are fixed with lip magnetic rubber (3), lip on metal shaft (7) primary sealing area side contact Magnetic fluid (4) sealing around lip magnetic rubber (3) is realized in magnetic rubber (3) and metal shaft (7) cooperation, in metal pole shoe (1) it is provided with groove between shell (6), has O-ring seals (5), O-ring seals (5) to realize metal pole shoe (1) and shell in groove Body (6) seals.
2. a kind of magnetic fluid-lip packing composite seal according to claim 1, it is characterised in that:It is described forever Magnet (2), metal pole shoe (1), lip magnetic rubber (3) and metal shaft (7) collectively form closed magnetic loop, when lip is ground It can be replenished in time when damage.
3. a kind of magnetic fluid-lip packing composite seal according to claim 1, it is characterised in that:The gold Belong to the range that the spacing between pole shoe (1) and metal shaft (7) is more than metal shaft (7) circular runout.
4. a kind of magnetic fluid-lip packing composite seal according to claim 1, it is characterised in that:The lip Shape magnetic rubber (3) is asymmetric triangular structure, and the inclination angle of inside is more than outer angle of heel.
5. a kind of magnetic fluid-lip packing composite seal according to claim 1, it is characterised in that:The lip Shape magnetic rubber (3) material is that the nano magnetic particle coated using coupling agent is prepared.
CN201810433395.2A 2018-05-08 2018-05-08 Magnetic fluid-lip seal composite seal Active CN108612850B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201810433395.2A CN108612850B (en) 2018-05-08 2018-05-08 Magnetic fluid-lip seal composite seal
PCT/CN2018/114447 WO2019214194A1 (en) 2018-05-08 2018-11-08 Combined seal of magnetic fluid and lip seal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810433395.2A CN108612850B (en) 2018-05-08 2018-05-08 Magnetic fluid-lip seal composite seal

Publications (2)

Publication Number Publication Date
CN108612850A true CN108612850A (en) 2018-10-02
CN108612850B CN108612850B (en) 2020-07-28

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Application Number Title Priority Date Filing Date
CN201810433395.2A Active CN108612850B (en) 2018-05-08 2018-05-08 Magnetic fluid-lip seal composite seal

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CN (1) CN108612850B (en)
WO (1) WO2019214194A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019214194A1 (en) * 2018-05-08 2019-11-14 清华大学 Combined seal of magnetic fluid and lip seal
WO2020150967A1 (en) * 2019-01-24 2020-07-30 清华大学 Magnetic liquid sealing device having function of preventing non-magnetic substance pollution

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11141692A (en) * 1997-11-06 1999-05-25 Isuzu Ceramics Res Inst Co Ltd Oil seal structure using magnetic force effect
CN101975278A (en) * 2010-11-04 2011-02-16 重庆大学 Self-healing seal device based on magnetorheological rubber and magnetorheological grease and reciprocating mechanism
CN104405886A (en) * 2014-11-26 2015-03-11 北京交通大学 Method for improving pressure resistance of magnetic liquid seal in low-temperature working environment
CN106969150A (en) * 2017-03-31 2017-07-21 北京交通大学 Pole shoe back-trough formula circulating cooling magnetic fluid seal device
CN206874820U (en) * 2017-06-02 2018-01-12 朱华 Rotary shaft magnetic fluid dynamic sealing device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06101194B2 (en) * 1986-10-31 1994-12-12 日本精工株式会社 Conductive sliding device
CN107893854A (en) * 2017-12-13 2018-04-10 广西科技大学 A kind of reciprocating motion magnetic fluid sealing structure
CN107830178A (en) * 2017-12-13 2018-03-23 广西科技大学 A kind of mixed type reciprocating sealing device
CN107906204A (en) * 2017-12-13 2018-04-13 广西科技大学 Staged pole shoe replaces the reciprocating sealing device of mixing with lip-type packing
CN108612850B (en) * 2018-05-08 2020-07-28 清华大学 Magnetic fluid-lip seal composite seal

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11141692A (en) * 1997-11-06 1999-05-25 Isuzu Ceramics Res Inst Co Ltd Oil seal structure using magnetic force effect
CN101975278A (en) * 2010-11-04 2011-02-16 重庆大学 Self-healing seal device based on magnetorheological rubber and magnetorheological grease and reciprocating mechanism
CN104405886A (en) * 2014-11-26 2015-03-11 北京交通大学 Method for improving pressure resistance of magnetic liquid seal in low-temperature working environment
CN106969150A (en) * 2017-03-31 2017-07-21 北京交通大学 Pole shoe back-trough formula circulating cooling magnetic fluid seal device
CN206874820U (en) * 2017-06-02 2018-01-12 朱华 Rotary shaft magnetic fluid dynamic sealing device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019214194A1 (en) * 2018-05-08 2019-11-14 清华大学 Combined seal of magnetic fluid and lip seal
WO2020150967A1 (en) * 2019-01-24 2020-07-30 清华大学 Magnetic liquid sealing device having function of preventing non-magnetic substance pollution

Also Published As

Publication number Publication date
CN108612850B (en) 2020-07-28
WO2019214194A1 (en) 2019-11-14

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