CN108869754B - Magnetic leakage prevention type magnetic fluid sealing structure - Google Patents
Magnetic leakage prevention type magnetic fluid sealing structure Download PDFInfo
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- CN108869754B CN108869754B CN201810914079.7A CN201810914079A CN108869754B CN 108869754 B CN108869754 B CN 108869754B CN 201810914079 A CN201810914079 A CN 201810914079A CN 108869754 B CN108869754 B CN 108869754B
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- pole shoes
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- 239000011553 magnetic fluid Substances 0.000 title claims abstract description 34
- 238000007789 sealing Methods 0.000 title claims abstract description 26
- 230000002265 prevention Effects 0.000 title claims abstract description 12
- 230000005389 magnetism Effects 0.000 claims description 8
- 230000005415 magnetization Effects 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims description 2
- 125000004122 cyclic group Chemical group 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
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Classifications
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- 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
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- 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 discloses a magnetic leakage prevention type magnetic fluid sealing structure, wherein a plurality of annular pole shoes are axially arranged at intervals in a space between the outer surface of a shaft and the inner wall of a shell, an axial magnetizing type permanent magnetic ring is clamped between every two adjacent pole shoes, the polarities of the magnetic poles of the two adjacent axial magnetizing type permanent magnetic rings are opposite, a shaft sleeve sleeved on the shaft is arranged between every two adjacent pole shoes, and the outer diameter of the shaft sleeve is smaller than the inner diameter of the axial magnetizing type permanent magnetic ring; gaps exist between the end surfaces of two sides of the shaft sleeve and the end surfaces of the adjacent pole shoes, gaps exist between the inner circular surfaces of the pole shoes and the outer surface of the shaft, and magnetic fluid is injected in the gaps. The invention can be sealed in axial and radial directions, and the sealing pressure resistance is enhanced. The path length is increased after the leakage path is changed, the loss of the magnetic fluid can be reduced, and the self-repairing capability is enhanced.
Description
Technical Field
The invention belongs to the field of mechanical engineering sealing, and particularly relates to a magnetic leakage prevention type magnetic fluid sealing structure.
Background
The existing magnetic fluid sealing structure generally comprises a shell with a hollow cavity and a shaft, wherein a permanent magnet and a pole shoe are arranged between the shaft and the shell for magnetic fluid sealing. The drawbacks of the prior art are mainly manifested in the following aspects:
1. the existing sealing gap is generally positioned in the radial direction, the sealing in the axial direction is realized after the magnetic fluid is filled, and the sealing pressure resistance is not good enough.
2. Because the traditional structure only has a radial gap, the flow resistance of the magnetic fluid is small, the leakage risk along the axial direction is large, and the leakage of the magnetic field in the magnetic fluid seal can cause the reduction of the magnetic field intensity in the magnetic circuit, thereby reducing the pressure resistance of the magnetic fluid seal.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a magnetic fluid sealing structure capable of improving the sealing pressure resistance.
The technical scheme for solving the problems is as follows: a magnetic leakage prevention type magnetic fluid sealing structure comprises a hollow shell, wherein one end of the shell is closed, the other end of the shell is open, a through hole is formed in the center of the closed end face of the shell, the magnetic leakage prevention type magnetic fluid sealing structure further comprises a shaft penetrating into the inner cavity of the shell from the through hole, a plurality of annular pole shoes are arranged in a space between the outer surface of the shaft and the inner wall of the shell at intervals along the axial direction, an axial magnetizing type permanent magnetic ring is clamped between every two adjacent pole shoes, the polarities of the magnetic poles of every two adjacent axial magnetizing type permanent magnetic rings are opposite, a shaft sleeve sleeved on the shaft is arranged between every two adjacent pole shoes, and the outer diameter of the shaft;
gaps exist between the end surfaces of two sides of the shaft sleeve and the end surfaces of the adjacent pole shoes, gaps exist between the inner circular surfaces of the pole shoes and the outer surface of the shaft, and magnetic fluid is injected into the gaps.
In the scheme, the axial and radial gaps are constructed by utilizing the shaft sleeve, the shaft and the pole shoe, and the magnetic fluid is injected into the gaps for sealing, so that the axial and radial directions are sealed, and the sealing pressure resistance is enhanced.
The traditional structure only designs a radial gap generally, can only form a seal in the axial direction, and once magnetic fluid leakage occurs, the magnetic fluid leakage leaks along the axial direction. After the structure of the invention is adopted, if the magnetic fluid leaks, the leakage path is axial, then radial, then axial, then radial and finally axial. Compared with the traditional structure, the length of the path is increased after the leakage path is changed, the flow resistance of the magnetic fluid is increased due to the increase of the path, the loss of the magnetic fluid can be reduced, and the self-repairing capability is enhanced.
Furthermore, the pole shoe closest to the closed end of the shell and the pole shoe closest to the open end of the shell are in the same shape, the inner circular surface of the pole shoe is a conical surface, a rectangular cross-section ring protruding downwards towards the shaft direction is arranged on the inner circular surface and positioned on the large-diameter end side of the conical surface, the rectangular cross-section ring is positioned on the end surface of one side of the pole shoe, the small-diameter end of the conical surface is positioned on the end surface of the other side of the pole shoe, and a structure that the gap between the two sides of the inner circular surface and the shaft is small and the gap between the middle of.
The inner circular surfaces of the two pole shoes positioned at the outermost side are designed into a structure with small gaps at two sides and large middle gap, so that the magnetic field gradient difference is formed.
The rectangular cross-section ring and the pole piece may be integrally formed.
Furthermore, the number of the pole shoes is at least three, except for the two pole shoes closest to the closed end and the open end of the shell, the other pole shoes positioned in the middle have the same shape, and the inner circular surface of the pole shoe positioned in the middle is V-shaped, so that a structure that the gap between the two sides of the inner circular surface and the shaft is small and the gap between the middle of the inner circular surface and the shaft is large is formed.
The design starting point of the inner circular surface of the pole shoe positioned in the middle is also to create a magnetic field gradient difference so as to improve the sealing pressure resistance.
Preferably, the number of the pole shoes is 2-10.
The structure can be used in different forms of demand scenes, such as reciprocating shaft seal and rotating shaft seal which are applicable.
When used in a rotary shaft seal arrangement, the shaft is a stepped shaft; a first bearing and a second bearing which are abutted with a shoulder of the shaft are arranged at two ends of the shaft, the first bearing is close to the closed end of the shell, and the second bearing is close to the open end of the shell;
the pole shoe and the axial magnetizing permanent magnet ring are positioned between the first bearing and the second bearing; a step is arranged at the closed end surface of the inner cavity of the shell;
a magnetism isolating ring is arranged between the pole shoe closest to the closed end of the shell and one end face of the first bearing, and the other end face of the first bearing is abutted against the step;
a magnetic isolating ring is arranged between the pole shoe closest to the open end of the shell and one end face of the second bearing, and the other end face of the second bearing is tightly sealed in the inner cavity of the shell through an end cover in a pressing mode.
When the shaft is used for a reciprocating shaft sealing structure, the shaft is an optical axis; and a magnetic isolation ring is arranged between the pole shoe closest to the closed end of the shell and the inner wall of the closed end of the shell, and the pole shoe closest to the open end of the shell is tightly pressed and sealed in the inner cavity of the shell through an end cover to realize reciprocating sealing.
The invention has the following remarkable effects:
1. the axial direction and the radial direction are sealed, and the sealing pressure resistance is enhanced.
2. After the structure of the invention is adopted, if the magnetic fluid leaks, the leakage path is axial, then radial, then axial, then radial and finally axial. Compared with the traditional structure, the length of the path is increased after the leakage path is changed, the flow resistance of the magnetic fluid is increased due to the increase of the path, the loss of the magnetic fluid can be reduced, and the self-repairing capability is enhanced.
3. The inner circle surface of the pole shoe is designed into a structure with small gaps at two sides and large middle gap, which is beneficial to forming magnetic field gradient difference and can improve the sealing pressure resistance.
Drawings
The invention will be further explained with reference to the drawings.
Fig. 1 is a schematic view of a magnetic leakage prevention type magnetic fluid sealing structure applied to a rotating shaft.
Fig. 2 is a schematic view of fig. 1 without the injection of magneto-rheological fluid (the symmetrical lower half is not shown).
In the figure: 1-shaft, 2-shell, 3-pole shoe, 4-end cover, 5-magnetism isolating ring, 6-shaft sleeve, 7-axial magnetization type permanent magnet ring, 8-conical surface, 9-rectangular section ring, 11-first bearing, 12-second bearing and 13-step.
Detailed Description
Taking magnetic fluid sealing of a rotating shaft as an example, as shown in fig. 1-2, the magnetic leakage prevention type magnetic fluid sealing structure comprises a hollow shell 2, wherein one end of the shell 2 is closed, and the other end of the shell is open. A through hole is arranged in the center of the closed end surface of the shell 2. And the shaft 1 is arranged in the inner cavity of the shell 2 from the through hole in a penetrating way.
A plurality of annular pole shoes 3 are axially spaced in the space between the outer surface of the shaft 1 and the inner wall of the housing 2. An axial magnetizing permanent magnet ring 7 is clamped between two adjacent pole shoes 3. The excircle of the axial magnetizing permanent magnetic ring 7 and the excircle of the pole shoe 3 are abutted with the inner wall of the shell 2. The polarities of the magnetic poles of two adjacent axial magnetizing type permanent magnet rings 7 are opposite.
A shaft sleeve 6 sleeved on the shaft 1 is arranged between every two adjacent pole shoes 3. The shaft sleeve 6 is annular. The end surfaces of the two sides of the shaft sleeve 6 are planes, and the end surfaces of the two sides are vertical surfaces after being installed on the shaft 2. The outer diameter of the shaft sleeve 6 is smaller than the inner diameter of the axial magnetizing permanent magnet ring 7.
There are at least three pole shoes 3. The pole shoe 3 closest to the closed end of the shell 2 and the pole shoe 3 closest to the open end of the shell 2 are in the same shape, the inner circular surface is a conical surface 8, a rectangular section ring 9 protruding downwards towards the shaft 1 is arranged on the inner circular surface and positioned on the large-diameter end side of the conical surface 8, the rectangular section ring 9 is positioned on the end surface of one side of the pole shoe 3, the small-diameter end of the conical surface 8 is positioned on the end surface of the other side of the pole shoe 3, and a structure that the gap between the two sides of the inner circular surface and the shaft 1 is small and the gap between the middle of the inner circular surface and the shaft 1.
Except the two pole shoes 3 closest to the closed end and the open end of the shell 2, the other pole shoes 3 positioned in the middle have the same shape, and the inner circular surface of the pole shoe 3 positioned in the middle is V-shaped, so that a structure that the gap between the two sides of the inner circular surface and the shaft 1 is small and the gap between the middle of the inner circular surface and the shaft 1 is large is formed.
Gaps exist between the end surfaces of two sides of the shaft sleeve 6 and the end surfaces of the adjacent pole shoes 3, gaps exist between the inner circular surfaces of the pole shoes 3 and the outer surface of the shaft 1, and magnetic fluid is injected into the gaps.
The shaft 1 is a stepped shaft. A first bearing 11 and a second bearing 12 are provided at both ends of the shaft 1 to abut against a shoulder of the shaft 1, the first bearing 11 being close to the closed end of the housing 2, and the second bearing 12 being close to the open end of the housing 2. .
The pole shoe 3 and the permanent magnet ring 7 of the axial magnetizing type are positioned between the first bearing 11 and the second bearing 12. A step 13 is arranged at the closed end surface of the inner cavity of the shell 2.
A magnetism isolating ring 5 is arranged between the pole shoe 3 closest to the closed end of the shell 2 and one end face of the first bearing 11, and the other end face of the first bearing 11 is abutted with the step 13.
A magnetism isolating ring 5 is arranged between the pole shoe 3 closest to the open end of the shell 2 and one end face of the second bearing 12, and the other end face of the second bearing 12 is pressed and sealed in the inner cavity of the shell 2 through an end cover 4.
Claims (5)
1. The utility model provides a leak protection magnetism type magnetic current body seal structure, includes hollow casing (2), casing (2) one end is sealed, the other end is opened, it has the through-hole to open at the seal end face center of casing (2), still including wearing to establish axle (1) to casing (2) inner chamber from the through-hole, be equipped with a plurality of cyclic annular pole shoes (3) along axial interval in the space between axle (1) surface and casing (2) inner wall, press from both sides between two adjacent pole shoes (3) and be equipped with axial magnetization type permanent magnetism ring (7), the polarity of the magnetic pole of two adjacent axial magnetization type permanent magnetism rings (7) is opposite, its characterized in that: a shaft sleeve (6) sleeved on the shaft (1) is arranged between every two adjacent pole shoes (3), and the outer diameter of the shaft sleeve (6) is smaller than the inner diameter of the axial magnetizing permanent magnetic ring (7);
gaps exist between the end surfaces of two sides of the shaft sleeve (6) and the end surfaces of the adjacent pole shoes (3), gaps exist between the inner circular surfaces of the pole shoes (3) and the outer surface of the shaft (1), and magnetic fluid is injected into the gaps;
the pole shoe (3) closest to the closed end of the shell (2) and the pole shoe (3) closest to the open end of the shell (2) are the same in shape, the inner circular surface of the pole shoe is a conical surface (8), a rectangular section ring (9) protruding downwards towards the shaft (1) is arranged on the inner circular surface and located on the large-diameter end side of the conical surface (8), the rectangular section ring (9) is located on the end surface of one side of the pole shoe (3), the small-diameter end of the conical surface (8) is located on the end surface of the other side of the pole shoe (3), and a structure that the gap between the two sides of the inner circular surface and the shaft (1) is small, and the gap between the middle of the inner circular surface and the shaft.
2. The magnetic leakage prevention type magnetic fluid seal structure according to claim 1, characterized in that: the number of the pole shoes (3) is at least three, except the two pole shoes (3) which are closest to the closed end and the open end of the shell (2), the other pole shoes (3) which are positioned in the middle have the same shape, and the inner circular surface of the pole shoe (3) which is positioned in the middle is V-shaped, so that a structure that the gap between the two sides of the inner circular surface and the shaft (1) is small and the gap between the middle of the inner circular surface and the shaft (1) is large is formed.
3. The magnetic leakage prevention type magnetic fluid seal structure according to claim 1 or 2, characterized in that: the number of the pole shoes (3) is 2-10.
4. The magnetic leakage prevention type magnetic fluid seal structure according to claim 1 or 2, characterized in that: the shaft (1) is a stepped shaft; a first bearing (11) and a second bearing (12) which are abutted to a shoulder of the shaft (1) are arranged at two ends of the shaft (1), the first bearing (11) is close to the closed end of the shell (2), and the second bearing (12) is close to the open end of the shell (2);
the pole shoe (3) and the axial magnetizing permanent magnet ring (7) are positioned between the first bearing (11) and the second bearing (12); a step (13) is arranged at the closed end surface of the inner cavity of the shell (2);
a magnetism isolating ring (5) is arranged between the pole shoe (3) closest to the closed end of the shell (2) and one end face of the first bearing (11), and the other end face of the first bearing (11) is abutted against the step (13);
a magnetism isolating ring (5) is arranged between the pole shoe (3) closest to the open end of the shell (2) and one end face of the second bearing (12), and the other end face of the second bearing (12) is pressed and sealed in the inner cavity of the shell (2) through an end cover (4).
5. The magnetic leakage prevention type magnetic fluid seal structure according to claim 1 or 2, characterized in that: the shaft (1) is an optical axis; a magnetic isolation ring is arranged between the pole shoe (3) closest to the closed end of the shell (2) and the inner wall of the closed end of the shell (2), and the pole shoe (3) closest to the open end of the shell (2) is tightly pressed and sealed in the inner cavity of the shell (2) through an end cover to realize reciprocating sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810914079.7A CN108869754B (en) | 2018-08-13 | 2018-08-13 | Magnetic leakage prevention type magnetic fluid sealing structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810914079.7A CN108869754B (en) | 2018-08-13 | 2018-08-13 | Magnetic leakage prevention type magnetic fluid sealing structure |
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| CN108869754A CN108869754A (en) | 2018-11-23 |
| CN108869754B true CN108869754B (en) | 2020-05-19 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728103B (en) * | 2020-12-30 | 2022-04-22 | 中铁工程装备集团有限公司 | Shield constructs owner and drives compound sealing device |
| CN112829914A (en) * | 2021-01-27 | 2021-05-25 | 武汉波依迈科技有限公司 | High-thrust sealing rim propeller and advancing tool adopting same |
| CN112829915A (en) * | 2021-02-02 | 2021-05-25 | 武汉波依迈科技有限公司 | High-power pump spray rim propeller |
| CN112963547B (en) * | 2021-03-23 | 2022-06-03 | 清华大学 | Magnetic liquid heat insulation sealing device |
| CN117108298B (en) * | 2023-10-23 | 2024-02-20 | 北京城建设计发展集团股份有限公司 | Shield tail sealing device of shield tunneling machine based on magnetic fluid sealing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| PL221367B1 (en) * | 2011-10-05 | 2016-03-31 | Akademia Górniczo Hutnicza Im Stanisława Staszica W Krakowie | Rotating shaft hybrid seal |
| CN205401723U (en) * | 2016-03-02 | 2016-07-27 | 广西科技大学 | Cascaded magnetic fluid seal device of symmetry type |
| CN107956882B (en) * | 2017-12-13 | 2023-05-05 | 广西科技大学 | Multistage disc magnetic fluid sealing device |
| CN107956883A (en) * | 2017-12-14 | 2018-04-24 | 广西科技大学 | A kind of radial direction socket type labyrinth type device for sealing magnetic fluid |
| CN108006232A (en) * | 2017-12-14 | 2018-05-08 | 广西科技大学 | A kind of mixed type labyrinth type device for sealing magnetic fluid |
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Application publication date: 20181123 Assignee: GUANGXI WINGOOD INTELLIGENT PARKING EQUIPMENT CO.,LTD. Assignor: GUANGXI University OF SCIENCE AND TECHNOLOGY Contract record no.: X2023980053817 Denomination of invention: A leakage proof magnetic fluid sealing structure Granted publication date: 20200519 License type: Common License Record date: 20231225 |