CN108612850B - Magnetic fluid-lip seal composite seal - Google Patents
Magnetic fluid-lip seal composite seal Download PDFInfo
- Publication number
- CN108612850B CN108612850B CN201810433395.2A CN201810433395A CN108612850B CN 108612850 B CN108612850 B CN 108612850B CN 201810433395 A CN201810433395 A CN 201810433395A CN 108612850 B CN108612850 B CN 108612850B
- Authority
- CN
- China
- Prior art keywords
- lip
- pole shoe
- metal
- seal
- shaped
- 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.)
- Active
Links
Images
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
-
- 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
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3224—Sealings 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
Abstract
A magnetic fluid-lip seal combined type seal comprises a metal shaft arranged on a shell, a metal pole shoe used for sealing is arranged between the metal shaft and the shell, a permanent magnet is arranged in the middle of the metal pole shoe, lip-shaped magnetic rubber is fixed on a contact point on one side, close to a main sealing surface of the metal shaft, of the metal pole shoe, the lip-shaped magnetic rubber is matched with the metal shaft to realize magnetic fluid seal around the lip-shaped magnetic rubber, a groove is formed between the metal pole shoe and the shell, an O-shaped seal ring is arranged in the groove, and the O-shaped seal ring realizes seal of the metal pole shoe and; the permanent magnet, the metal pole shoe, the lip-shaped magnetic rubber and the metal shaft jointly form a closed magnetic loop, and the lip can be supplemented in time when the lip is worn; the invention can overcome the material loss caused by friction and abrasion and the leakage caused by the material loss, and can be used in a higher liquid pressure environment.
Description
Technical Field
The invention relates to a sealing structure, in particular to a magnetic fluid-lip seal composite seal.
Background
The sealing part of mechanical equipment is an important structure for ensuring normal, stable and safe operation of the mechanical equipment, and once the sealing structure fails, a large amount of loss of working media and lubricating liquid can be caused, environmental pollution can be caused due to leakage, the equipment and the working environment are corroded, and the equipment and the working environment can be further seriously damaged due to fire and explosion, so that personal safety accidents and equipment safety accidents are caused. Therefore, research into sealing technology is the focus of current manufacturing developments.
The lip-shaped sealing ring is used as a classic rubber plastic dynamic sealing element, and is one of the most common sealing elements due to the simple and compact structure, reliable performance, zero leakage realization in a certain sense and wide adaptability. However, as modern technology has developed, the disadvantages and limitations of conventional lip seals have gradually emerged. Because the lip part of the sealing ring needs to be kept in contact with the rotating shaft and has certain axial force, friction torque is inevitably generated in the working process, the sealing ring and the rotating shaft are abraded, and energy loss is generated. And as the amount of wear increases, the lip seal progressively fails resulting in leakage.
As a novel sealing form, the magnetic fluid seal utilizes the response characteristic of the magnetic fluid to a magnetic field, and can realize zero leakage. The magnetic fluid seal has the advantages of wide application range, strong sealing adaptability, stable use, long service life and no pollution, and is put into use in more and more occasions. However, the magnetic fluid seal also has the limitation that the magnetic fluid is difficult to bear high pressure difference, and the development and application of the magnetic fluid seal are limited to a certain extent.
Disclosure of Invention
In order to overcome the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a magnetic fluid-lip seal composite seal that overcomes material loss and resultant leakage from frictional wear and that can be used in higher liquid pressure environments.
In order to achieve the purpose, the invention adopts the technical scheme that:
a magnetic fluid-lip seal combined type seal comprises a metal shaft 7 installed on a shell 6, a metal pole shoe 1 used for sealing is arranged between the metal shaft 7 and the shell 6, a permanent magnet 2 is installed in the middle of the metal pole shoe 1, lip-shaped magnetic rubber 3 is fixed on a contact on one side, close to a main sealing surface of the metal shaft 7, of the metal pole shoe 1, the lip-shaped magnetic rubber 3 is matched with the metal shaft 7 to achieve sealing of magnetic fluid 4 around the lip-shaped magnetic rubber 3, a groove is formed between the metal pole shoe 1 and the shell 6, an O-shaped seal ring 5 is arranged in the groove, and the metal pole shoe 1 and the shell 6 are sealed through the O-shaped seal.
The permanent magnet 2, the metal pole shoe 1, the lip-shaped magnetic rubber 3 and the metal shaft 7 form a closed magnetic loop together, and the lip-shaped magnetic loop can be supplemented in time when the lip is worn.
The distance between the metal pole shoe 1 and the metal shaft 7 is larger than the radial runout range of the metal shaft 7.
The lip-shaped magnetic rubber 3 is in an asymmetric triangular structure, and the inclination angle of the inner side is larger than that of the outer side.
The lip-shaped magnetic rubber 3 material is prepared by using nano magnetic particles coated by a coupling agent.
The invention has the beneficial effects that:
the permanent magnet 2, the metal pole shoe 1, the lip-shaped magnetic rubber 3 and the metal shaft 7 form a closed magnetic loop together, so that the magnetic fluid 4 is ensured to be distributed near a lip needing to seal the lip-shaped magnetic rubber 3, and the lip can be supplemented in time when the lip is worn.
Compared with the prior art, the invention solves the defect that the magnetic fluid seal can not be used in a higher pressure difference environment, the magnetic fluid at the lip part can automatically compensate the gap generated by the abrasion of the lip seal, and the minimum gap can be automatically found to ensure the non-contact seal, thereby realizing zero leakage.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic diagram of a closed magnetic loop formed by the permanent magnet 2, the metal pole shoe 1, the lip-shaped magnetic rubber 3 and the metal shaft 7.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, a magnetic fluid-lip seal combined type seal comprises a metal shaft 7 installed on a shell 6, a metal pole shoe 1 used for sealing is arranged between the metal shaft 7 and the shell 6, a permanent magnet 2 is installed in the middle of the metal pole shoe 1, lip-shaped magnetic rubber 3 is fixed on a contact on one side, close to a main sealing surface of the metal shaft 7, of the metal pole shoe 1, the lip-shaped magnetic rubber 3 is matched with the metal shaft 7 to achieve sealing of magnetic fluid 4 around the lip-shaped magnetic rubber 3, in order to ensure that a secondary sealing surface does not leak and to facilitate adjustment of the radial position of the metal pole shoe 1, a groove is formed between the metal pole shoe 1 and the shell 6, an O-shaped sealing ring 5 is arranged in the groove, and the O-shaped.
Referring to fig. 2, the permanent magnet 2, the metal pole shoe 1, the lip-shaped magnetic rubber 3 and the metal shaft 7 together form a closed magnetic loop, so that the magnetic fluid 4 is distributed near a lip needing to seal the lip-shaped magnetic rubber 3, and can be timely supplemented when the lip is worn.
The permanent magnet 2, the metal pole shoe 1, the lip-shaped magnetic rubber 3 and the metal shaft 7 form a closed magnetic loop together, and the lip-shaped magnetic loop can be supplemented in time when the lip is worn.
The distance between the metal pole shoe 1 and the metal shaft 7 is larger than the radial runout range of the metal shaft 7.
The lip-shaped magnetic rubber 3 is in an asymmetric triangular structure, and the inclination angle of the inner side is larger than that of the outer side.
The lip-shaped magnetic rubber 3 material is prepared by using nano magnetic particles coated by a coupling agent.
The working principle of the invention is as follows: when the magnetic fluid pump works, the lip of the lip-shaped magnetic rubber 3 on the contact of the metal pole shoe 1 performs a reverse pumping action to play a role in blocking the internal action medium, and at the moment, the magnetic fluid 4 is gathered around the contact of the metal pole shoe 1 under the action of a magnetic loop formed by the permanent magnet 2, the metal pole shoe 1, the lip-shaped magnetic rubber 3 and the metal shaft 7; when the lip of the lip-shaped magnetic rubber 3 is worn to form a gap, the magnetic field intensity in the gap is larger, so that the magnetic fluid 4 is quickly gathered in the newly generated gap under the action of the magnetic field, the leakage possibly caused by the wear of the lip-shaped magnetic rubber 3 is filled, the lip-shaped magnetic rubber 3 and the wear and the supplement of the magnetic fluid 4 gradually reach balance, the minimum gap sealed by the magnetic fluid 4 is automatically found, and the safe and stable sealing structure is realized.
The common magnetic fluid seal is limited by shaft jumping, a larger gap needs to be reserved between a pole shoe and a shaft to prevent friction, the maximum pressure which can be applied by the magnetic fluid seal is severely limited, and the invention can self-compensate the gap caused by material abrasion and realize liquid seal under a higher pressure environment.
Claims (3)
1. A magnetic fluid-lip seal combined type seal comprises a metal shaft (7) installed on a shell (6), a metal pole shoe (1) used for sealing is arranged between the metal shaft (7) and the shell (6), and the magnetic fluid-lip seal combined type seal is characterized in that: the permanent magnet (2) is installed in the middle of the metal pole shoe (1), lip-shaped magnetic rubber (3) is fixed on a contact on one side, close to a main sealing surface of the metal shaft (7), of the metal pole shoe (1), the lip-shaped magnetic rubber (3) is matched with the metal shaft (7) to achieve sealing of magnetic fluid (4) around the lip-shaped magnetic rubber (3), a groove is formed between the metal pole shoe (1) and the shell (6), an O-shaped sealing ring (5) is arranged in the groove, and the O-shaped sealing ring (5) achieves sealing of the metal pole shoe (1) and the shell (6);
the permanent magnet (2), the metal pole shoe (1), the lip-shaped magnetic rubber (3) and the metal shaft (7) jointly form a closed magnetic loop, and the lip can be supplemented in time when the lip is worn;
the lip-shaped magnetic rubber (3) is in an asymmetric triangular structure, and the inclination angle of the inner side is larger than that of the outer side.
2. A magnetic fluid-lip seal composite seal according to claim 1, wherein: the distance between the metal pole shoe (1) and the metal shaft (7) is larger than the radial runout range of the metal shaft (7).
3. A magnetic fluid-lip seal composite seal according to claim 1, wherein: the lip-shaped magnetic rubber (3) material is prepared by using nano magnetic particles coated by a coupling agent.
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 CN108612850A (en) | 2018-10-02 |
| CN108612850B true CN108612850B (en) | 2020-07-28 |
Family
ID=63662401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810433395.2A Active CN108612850B (en) | 2018-05-08 | 2018-05-08 | Magnetic fluid-lip seal composite seal |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108612850B (en) |
| WO (1) | WO2019214194A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108612850B (en) * | 2018-05-08 | 2020-07-28 | 清华大学 | Magnetic fluid-lip seal composite 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)
| 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)
| 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 |
| 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 |
| CN107830178A (en) * | 2017-12-13 | 2018-03-23 | 广西科技大学 | A kind of mixed type reciprocating sealing device |
| CN108612850B (en) * | 2018-05-08 | 2020-07-28 | 清华大学 | Magnetic fluid-lip seal composite seal |
-
2018
- 2018-05-08 CN CN201810433395.2A patent/CN108612850B/en active Active
- 2018-11-08 WO PCT/CN2018/114447 patent/WO2019214194A1/en active Application Filing
Patent Citations (5)
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108612850A (en) | 2018-10-02 |
| WO2019214194A1 (en) | 2019-11-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201173295Y (en) | Contact type mechanical end-face leakage-free magnetic sealing member | |
| CN108612850B (en) | Magnetic fluid-lip seal composite seal | |
| CN105351528B (en) | A kind of magnetic liquid magnetic sealing device suitable for high speed conditions | |
| CN109162955B (en) | End surface labyrinth combined automatic disengaging type dynamic sealing device for engine turbo pump | |
| CN201050598Y (en) | Mechanical seal | |
| CN104279386B (en) | Piston balance compensating high-speed and high-pressure rotary joint | |
| CN204493719U (en) | The efficient shaft seal structure of helical-lobe compressor | |
| CN102900846A (en) | Novel sealing device combining Archimedes spiral groove sealing and contact type mechanical sealing | |
| CN210715245U (en) | Shaft seal device of pump | |
| CN210716072U (en) | Fixed ball valve | |
| CN102865369A (en) | Floating sealing ring with double effects of static pressure and dynamic pressure | |
| CN109237031A (en) | A kind of axis surface has the lip seal configuration of texture | |
| CN104747723A (en) | Efficient shaft sealing structure of screw compressor | |
| CN110285218B (en) | Constant-elasticity film-coating involute spiral groove long-life sealing device | |
| CN212080157U (en) | Gas film non-contact double-end-face mechanical seal for fan | |
| CN209026202U (en) | A kind of seal combination with arc baffle ring | |
| CN103256391B (en) | Self-adaptation sealing-type mechanical sealing device | |
| CN203162153U (en) | Stair-shaped sealing piece and stair-shaped coaxial sealing piece | |
| CN202484306U (en) | Floating oil seal | |
| CN209146324U (en) | A kind of L-type seal combination | |
| CN107575579A (en) | A kind of panorama photoelectric observing takes aim at the combined type rotary dynamic sealing structure of equipment | |
| CN207229756U (en) | A kind of deep-etching mechanically-sealing apparatus | |
| CN208123450U (en) | A kind of Containerization type | |
| CN103697015B (en) | A kind of lightning protection, anti-shearing hydraulic cylinder device | |
| CN216555366U (en) | Novel embedded floating oil seal |
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 |