CN108930795B - Mixed concave-convex magnetic fluid sealing device - Google Patents
Mixed concave-convex magnetic fluid sealing device Download PDFInfo
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- CN108930795B CN108930795B CN201811017193.6A CN201811017193A CN108930795B CN 108930795 B CN108930795 B CN 108930795B CN 201811017193 A CN201811017193 A CN 201811017193A CN 108930795 B CN108930795 B CN 108930795B
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- ring
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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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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention relates to a mixed concave-convex magnetic fluid sealing device, which comprises a shell, wherein the shell is composed of more than one magnetic fluid sealing unit, and the magnetic fluid sealing unit comprises an outer pole shoe ring I, an outer pole shoe ring II, an outer pole shoe ring III, an inner pole shoe ring, a permanent magnet ring I, a permanent magnet ring II and a permanent magnet ring III; the inner pole shoe ring comprises an axial ring, a radial ring I and a radial ring II, the axial ring is sleeved on the shaft, the radial ring I is arranged in the middle of the outer circular surface of the axial ring, and the radial ring II is arranged at the right end of the outer circular surface of the axial ring; a groove II is formed in the middle of the inner circular surface of the axial ring, and a permanent magnet ring I is arranged in the groove II; the permanent magnet ring II is arranged on the inner circular surface of the shell and is positioned between the outer pole shoe ring I and the outer pole shoe ring II, the inner circular surface of the permanent magnet ring II corresponds to the outer circular surface of the radial ring I, and a gap is reserved between the permanent magnet ring II and the outer circular surface of the radial ring I. The sealing device can solve the problem of lower pressure resistance of the existing sealing device.
Description
Technical Field
The invention belongs to the field of mechanical engineering sealing, and particularly relates to a hybrid concave-convex magnetic fluid sealing device.
Background
When the magnetic fluid sealing technology is applied to a high-speed heavy-load sealing environment, the pressure resistance of the sealing device is reduced due to the loss of magnetic fluid, so that the sealing device is invalid due to the reduction of magnetic fluid, and the improvement of the pressure resistance of the large-gap magnetic fluid sealing is one of hot problems in current research.
One of the methods of improving the pressure resistance of the magnetic fluid seal under large gaps is by improving the magnetic fluid seal structure as a seal device described in comparative document 1 (patent publication No. CN106321854 a). Although the sealing performance of the sealing device is greatly improved compared with that of common magnetic fluid, the sealing performance still cannot meet the high sealing performance requirements of special working conditions such as high speed, heavy load and the like.
Disclosure of Invention
The invention aims to provide a hybrid concave-convex magnetic fluid sealing device, so that the problem of low pressure resistance of the conventional sealing device is solved, and the sealing technology is successfully applied to the fields of high speed, heavy load and the like.
The technical scheme of the invention is as follows:
the hybrid concave-convex magnetic fluid sealing device comprises a shell (2);
the magnetic fluid sealing unit comprises an outer pole shoe ring I, an outer pole shoe ring II, an outer pole shoe ring III, an inner pole shoe ring, a permanent magnet ring I, a permanent magnet ring II and a permanent magnet ring III;
the inner pole shoe ring comprises an axial ring, a radial ring I and a radial ring II, the axial ring is sleeved on the shaft, the radial ring I is arranged in the middle of the outer circular surface of the axial ring, and the radial ring II is arranged at the right end of the outer circular surface of the axial ring;
the outer pole shoe ring I, the outer pole shoe ring II and the outer pole shoe ring III are all arranged on the inner wall of the shell, the outer pole shoe ring I is arranged corresponding to the left end of the outer circular surface of the axial ring, the inner circular surface of the outer pole shoe ring I is provided with pole teeth I, the pole teeth I extend to the outer circular surface of the axial ring along the radial direction, a gap is reserved between the pole teeth I and the outer circular surface of the axial ring, and magnetic fluid is filled in the gap for sealing; the outer pole shoe ring II is arranged corresponding to the outer circular surface of the axial ring between the radial ring I and the radial ring II, the inner circular surface of the outer pole shoe ring II is provided with pole teeth II, the pole teeth II extend along the radial direction to the outer circular surface of the axial ring, a gap is reserved between the pole teeth II and the outer circular surface of the axial ring, and magnetic fluid is filled in the gap for sealing; the outer pole shoe ring III is arranged corresponding to the outer circular surface of the radial ring II, a groove I is arranged on the radial ring II, a permanent magnet ring III is arranged in the groove I, a gap is reserved between the inner circular surface of the outer pole shoe ring III and the outer circular surface of the permanent magnet ring III, and magnetic fluid is filled in the gap for sealing; the right end face of the outer pole shoe ring II is in contact with the left end face of the outer pole shoe ring III;
a groove II is formed in the middle of the inner circular surface of the axial ring, and a permanent magnet ring I is arranged in the groove II;
the permanent magnet ring II is arranged on the inner circular surface of the shell and is positioned between the outer pole shoe ring I and the outer pole shoe ring II, the inner circular surface of the permanent magnet ring II corresponds to the outer circular surface of the radial ring I, and a gap is reserved between the permanent magnet ring II and the outer circular surface of the radial ring I.
The outer circular surface of the permanent magnet ring III is flush with the outer circular surface of the radial ring II.
The number of the pole teeth I is 1-10; the number of the pole teeth II is 1-10.
The size of a gap between the pole tooth I and the outer circular surface of the axial ring is 0.05-3 mm; the size of a gap between the pole tooth II and the outer circular surface of the axial ring is 0.05-3 mm; the gap between the inner circular surface of the outer pole shoe ring III and the outer circular surface of the permanent magnet ring III is 0.05-3 mm.
The permanent magnet ring I is an axial magnetizing permanent magnet, the permanent magnet ring II is an axial magnetizing permanent magnet, and the permanent magnet ring III is a radial magnetizing permanent magnet.
The magnetic force lines of the permanent magnet ring I and the permanent magnet ring II are opposite in direction.
The mixed concave-convex magnetic fluid sealing device also comprises a left magnetic isolation ring, a right magnetic isolation ring and a right magnetic isolation ring; the left magnetism isolating ring is sleeved on the shaft and is positioned at the left side of the axial ring; the left two magnetism isolating rings are arranged on the inner wall of the shell and are positioned on the left side of the outer pole shoe ring I; the right magnetism isolating ring is sleeved on the shaft and positioned on the right side of the axial ring; the right two magnetism isolating rings are arranged on the inner wall of the shell and are positioned on the right side of the outer pole shoe ring III.
The mixed concave-convex magnetic fluid sealing device also comprises a left bearing and a right bearing; the left bearing and the right bearing are respectively sleeved on the shaft, and the left bearing is arranged at the left side of the left first magnetism isolating ring and the left second magnetism isolating ring and is respectively contacted with the left first magnetism isolating ring and the left second magnetism isolating ring; the right bearing is arranged on the right sides of the right first magnetism isolating ring and the right second magnetism isolating ring and is respectively contacted with the right first magnetism isolating ring and the right second magnetism isolating ring.
The right end of the shell is provided with an end cover.
The magnetic fluid sealing units are arranged in 2-3 groups and are distributed along the axial direction of the shaft.
According to the invention, the mixed concave-convex pole shoe is designed, the pole teeth are designed in the radial direction of the outer pole shoe ring I and the outer pole shoe ring II, the permanent magnet is arranged at the right end of the inner pole shoe to prevent the loss of magnetic fluid, and the magnetic fluid is injected into the radial sealing gap formed among the outer pole shoe ring I, the outer pole shoe ring II, the outer pole shoe ring I II and the inner pole shoe, so that the mixed concave-convex magnetic fluid sealing device is realized.
The invention can overcome the problem that the existing sealing device cannot realize the high sealing performance requirements of special working conditions such as high speed, heavy load and the like, adopts the concave-convex structural design, increases the magnetic flux in a magnetic circuit, reduces the loss of magnetic fluid when the sealing fails, improves the pressure resistance and the sealing reliability of the magnetic fluid under the condition of large clearance, and expands the safe working range of the sealing device.
Drawings
FIG. 1 is a schematic structural diagram of a hybrid concave-convex magnetic fluid sealing device according to an embodiment of the present invention;
the numbers in the figures are marked and the corresponding names are as follows:
the magnetic pole piece comprises a 1-shaft, a 2-shell, a 3-outer pole piece ring I, a 4-outer pole piece ring II, a 5-outer pole piece ring III, a 6-inner pole piece ring, a 7-permanent magnet ring I, an 8-permanent magnet ring II, a 9-permanent magnet ring III, a 10-pole tooth I, a 11-pole tooth II, a 12-left magnetism isolating ring, a 13-left magnetism isolating ring, a 14-right magnetism isolating ring, a 15-right magnetism isolating ring, a 16-left bearing, a 17-right bearing and an 18-end cover.
61-axial ring 41, 62-radial ring I, 63-radial ring II.
Description of the embodiments
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the hybrid concave-convex magnetic fluid sealing device comprises a shell 2;
the magnetic fluid sealing unit comprises an outer pole shoe ring I3, an outer pole shoe ring II4, an outer pole shoe ring III5, an inner pole shoe ring 6, a permanent magnet ring I7, a permanent magnet ring II8 and a permanent magnet ring III9;
the inner pole shoe ring 6 comprises an axial ring 61, a radial ring I62 and a radial ring II63, the axial ring 61 is sleeved on the shaft 1, the radial ring I62 is arranged in the middle of the outer circular surface of the axial ring 61, and the radial ring II63 is arranged at the right end of the outer circular surface of the axial ring 61;
the outer pole shoe ring I3, the outer pole shoe ring II4 and the outer pole shoe ring III5 are all arranged on the inner wall of the shell 2, the outer pole shoe ring I3 is arranged corresponding to the left end of the outer circular surface of the axial ring 61, the inner circular surface of the outer pole shoe ring I3 is provided with pole teeth I10, the pole teeth I10 extend along the radial direction to the outer circular surface of the axial ring 61, a gap is reserved between the pole teeth I10 and the outer circular surface of the axial ring 61, and magnetic fluid is filled in the gap for sealing; the outer pole shoe ring II4 is arranged corresponding to the outer circular surface of the axial ring 61 between the radial ring I62 and the radial ring II63, the inner circular surface of the outer pole shoe ring II is provided with pole teeth II11, the pole teeth II11 extend along the radial direction to the outer circular surface of the axial ring 61, a gap is reserved between the pole teeth II11 and the outer circular surface of the axial ring 61, and magnetic fluid is filled in the gap for sealing; the outer pole shoe ring III5 is arranged corresponding to the outer circular surface of the radial ring II63, a groove I is arranged on the radial ring II63, a permanent magnet ring III9 is arranged in the groove I, a gap is reserved between the inner circular surface of the outer pole shoe ring III5 and the outer circular surface of the permanent magnet ring III9, and magnetic fluid is filled in the gap for sealing; the right end face of the outer pole shoe ring II4 is in contact with the left end face of the outer pole shoe ring III 5;
the middle part of the inner circular surface of the axial ring 61 is provided with a groove II, and a permanent magnet ring I7 is arranged in the groove II;
the permanent magnet ring II8 is arranged on the inner circular surface of the shell 2 and is positioned between the outer pole shoe ring I3 and the outer pole shoe ring II4, and the inner circular surface corresponds to the outer circular surface of the radial ring I62 and a gap is reserved between the inner circular surface and the outer circular surface of the radial ring I62.
The outer circular surface of the permanent magnet ring III9 is flush with the outer circular surface of the radial ring II 63.
The number of the pole teeth I10 is 1-10; the number of the pole teeth II11 is 1-10.
The size of a gap between the pole tooth I10 and the outer circular surface of the axial ring 61 is 0.05-3 mm; the size of a gap between the pole tooth II11 and the outer circular surface of the axial ring 61 is 0.05-3 mm; the size of the gap between the inner circular surface of the outer pole shoe ring III5 and the outer circular surface of the permanent magnet ring III9 is 0.05-3 mm.
The permanent magnet ring I7 is an axial magnetizing type permanent magnet, the permanent magnet ring II8 is an axial magnetizing type permanent magnet, and the permanent magnet ring III9 is a radial magnetizing type permanent magnet.
The magnetic force lines of the permanent magnet ring I7 and the permanent magnet ring II8 are opposite in direction.
The mixed concave-convex magnetic fluid sealing device also comprises a left magnetism isolating ring 12, a left two magnetism isolating rings 13, a right one magnetism isolating ring 14 and a right two magnetism isolating rings 15; the left magnetism isolating ring 12 is sleeved on the shaft 1 and is positioned at the left side of the axial ring 61; the left two magnetism isolating rings 13 are arranged on the inner wall of the shell 2 and are positioned on the left side of the outer pole shoe ring I3; the right magnetism isolating ring 14 is sleeved on the shaft 1 and is positioned on the right side of the axial ring 61; the right two magnetism isolating rings 15 are arranged on the inner wall of the shell 2 and are positioned on the right side of the outer pole shoe ring III 5.
The hybrid concave-convex magnetic fluid sealing device also comprises a left bearing 16 and a right bearing 17; the left bearing 16 and the right bearing 17 are respectively sleeved on the shaft 1, and the left bearing 16 is arranged on the left sides of the left first magnetism isolating ring 12 and the left second magnetism isolating ring 13 and is respectively contacted with the left first magnetism isolating ring 12 and the left second magnetism isolating ring 13; the right bearing 17 is arranged on the right sides of the right first magnetism isolating ring 14 and the right second magnetism isolating ring 15 and is respectively contacted with the right first magnetism isolating ring 14 and the right second magnetism isolating ring 15.
The right end of the shell 2 is provided with an end cover 18.
The magnetic fluid sealing units are arranged in 2-3 groups and are distributed along the axial direction of the shaft 1.
Claims (7)
1. The utility model provides a hybrid concave-convex type magnetic fluid sealing device, includes shell (2), its characterized in that:
the magnetic fluid sealing unit comprises an outer pole shoe ring I (3), an outer pole shoe ring II (4), an outer pole shoe ring III (5), an inner pole shoe ring (6), a permanent magnet ring I (7), a permanent magnet ring II (8) and a permanent magnet ring III (9);
the inner pole shoe ring (6) comprises an axial ring (61), a radial ring I (62) and a radial ring II (63), the axial ring (61) is sleeved on the shaft (1), the radial ring I (62) is arranged in the middle of the outer circular surface of the axial ring (61), and the radial ring II (63) is arranged at the right end of the outer circular surface of the axial ring (61);
the outer pole shoe ring I (3), the outer pole shoe ring II (4) and the outer pole shoe ring III (5) are all arranged on the inner wall of the shell (2), the outer pole shoe ring I (3) is arranged corresponding to the left end of the outer circular surface of the axial ring (61), the inner circular surface of the outer pole shoe ring I is provided with pole teeth I (10), the pole teeth I (10) extend along the radial direction to the outer circular surface of the axial ring (61), a gap is reserved between the pole teeth I (10) and the outer circular surface of the axial ring (61), and magnetic fluid is filled in the gap for sealing; the outer pole shoe ring II (4) is arranged corresponding to the outer circular surface between the radial ring I (62) and the radial ring II (63) on the axial ring (61), the inner circular surface of the outer pole shoe ring II is provided with a pole tooth II (11), the pole tooth II (11) extends along the radial direction to the outer circular surface of the axial ring (61), a gap is reserved between the pole tooth II and the outer circular surface of the axial ring (61), and magnetic fluid is filled in the gap for sealing; the outer pole shoe ring III (5) is arranged corresponding to the outer circular surface of the radial ring II (63), a groove I is formed in the radial ring II (63), a permanent magnet ring III (9) is arranged in the groove I, a gap is reserved between the inner circular surface of the outer pole shoe ring III (5) and the outer circular surface of the permanent magnet ring III (9), and magnetic fluid is filled in the gap for sealing; the right end face of the outer pole shoe ring II (4) is contacted with the left end face of the outer pole shoe ring III (5);
a groove II is formed in the middle of the inner circular surface of the axial ring (61), and a permanent magnet ring I (7) is arranged in the groove II;
the permanent magnet ring II (8) is arranged on the inner circular surface of the shell (2), is positioned between the outer pole shoe ring I (3) and the outer pole shoe ring II (4), and the inner circular surface corresponds to the outer circular surface of the radial ring I (62) and is provided with a gap with the outer circular surface of the radial ring I (62);
the outer circular surface of the permanent magnet ring III (9) is flush with the outer circular surface of the radial ring II (63);
the number of the pole teeth I (10) is 1-10; the number of the pole teeth II (11) is 1-10.
2. A hybrid male and female magnetic fluid seal as defined in claim 1, wherein: the size of a gap between the pole teeth I (10) and the outer circular surface of the axial ring (61) is 0.05-3 mm; the size of a gap between the pole tooth II (11) and the outer circular surface of the axial ring (61) is 0.05-3 mm; the size of a gap between the inner circular surface of the outer pole shoe ring III (5) and the outer circular surface of the permanent magnet ring III (9) is 0.05-3 mm.
3. A hybrid male and female magnetic fluid seal as defined in claim 1, wherein: the permanent magnet ring I (7) is an axial magnetizing type permanent magnet, the permanent magnet ring II (8) is an axial magnetizing type permanent magnet, and the permanent magnet ring III (9) is a radial magnetizing type permanent magnet.
4. A hybrid male and female magnetic fluid seal as defined in claim 1, wherein: the magnetic force lines of the permanent magnet ring I (7) and the permanent magnet ring II (8) are opposite in direction.
5. A hybrid male and female magnetic fluid seal as defined in claim 1, wherein: the device also comprises a left magnetism isolating ring (12), a left two magnetism isolating rings (13), a right one magnetism isolating ring (14) and a right two magnetism isolating rings (15); the left magnetism isolating ring (12) is sleeved on the shaft (1) and is positioned at the left side of the axial ring (61); the left two magnetism isolating rings (13) are arranged on the inner wall of the shell (2) and are positioned on the left side of the outer pole shoe ring I (3); the right magnetism isolating ring (14) is sleeved on the shaft (1) and is positioned on the right side of the axial ring (61); the right two magnetism isolating rings (15) are arranged on the inner wall of the shell (2) and are positioned on the right side of the outer pole shoe ring III (5).
6. A hybrid male and female magnetic fluid seal as defined in claim 5, wherein: the device also comprises a left bearing (16) and a right bearing (17); the left bearing (16) and the right bearing (17) are respectively sleeved on the shaft (1), and the left bearing (16) is arranged on the left side of the left magnetic isolation ring (12) and the left magnetic isolation ring (13) and is respectively contacted with the left magnetic isolation ring (12) and the left magnetic isolation ring (13); the right bearing (17) is arranged on the right sides of the right first magnetism isolating ring (14) and the right second magnetism isolating ring (15) and is respectively contacted with the right first magnetism isolating ring (14) and the right second magnetism isolating ring (15).
7. A hybrid male and female magnetic fluid seal as defined in claim 1, wherein: the magnetic fluid sealing units are arranged in 2-3 groups and are distributed along the axial direction of the shaft (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811017193.6A CN108930795B (en) | 2018-09-03 | 2018-09-03 | Mixed concave-convex magnetic fluid sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811017193.6A CN108930795B (en) | 2018-09-03 | 2018-09-03 | Mixed concave-convex magnetic fluid sealing device |
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| Publication Number | Publication Date |
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| CN108930795A CN108930795A (en) | 2018-12-04 |
| CN108930795B true CN108930795B (en) | 2023-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811017193.6A Active CN108930795B (en) | 2018-09-03 | 2018-09-03 | Mixed concave-convex magnetic fluid sealing device |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4628384A (en) * | 1983-08-26 | 1986-12-09 | Ferrofluidics Corporation | Bearing assembly with integrated ferrofluid seal |
| EP0297878A2 (en) * | 1987-06-29 | 1989-01-04 | Ferrofluidics Corporation | Compact Long-life magnetic fluid seal |
| JPH07305777A (en) * | 1994-05-11 | 1995-11-21 | Nippon Ferrofluidics Kk | Conductive magnetic fluid seal device |
| CN103234049A (en) * | 2013-04-12 | 2013-08-07 | 北京交通大学 | Method for improving sealing reliability and prolonging service life of split magnetic liquid sealing device |
| CN106090238A (en) * | 2016-08-15 | 2016-11-09 | 广西科技大学 | A kind of staggered device for sealing magnetic fluid of split-type |
| CN106321854A (en) * | 2016-10-21 | 2017-01-11 | 北京交通大学 | Magnetic liquid sealing device with radial isodirectional magnetization of permanent magnets |
| CN207213180U (en) * | 2017-08-21 | 2018-04-10 | 埃慕迪磁电科技(上海)有限公司 | A kind of zigzag tooth end-surface type magnetic fluid seal device |
-
2018
- 2018-09-03 CN CN201811017193.6A patent/CN108930795B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4628384A (en) * | 1983-08-26 | 1986-12-09 | Ferrofluidics Corporation | Bearing assembly with integrated ferrofluid seal |
| EP0297878A2 (en) * | 1987-06-29 | 1989-01-04 | Ferrofluidics Corporation | Compact Long-life magnetic fluid seal |
| JPH07305777A (en) * | 1994-05-11 | 1995-11-21 | Nippon Ferrofluidics Kk | Conductive magnetic fluid seal device |
| CN103234049A (en) * | 2013-04-12 | 2013-08-07 | 北京交通大学 | Method for improving sealing reliability and prolonging service life of split magnetic liquid sealing device |
| CN106090238A (en) * | 2016-08-15 | 2016-11-09 | 广西科技大学 | A kind of staggered device for sealing magnetic fluid of split-type |
| CN106321854A (en) * | 2016-10-21 | 2017-01-11 | 北京交通大学 | Magnetic liquid sealing device with radial isodirectional magnetization of permanent magnets |
| CN207213180U (en) * | 2017-08-21 | 2018-04-10 | 埃慕迪磁电科技(上海)有限公司 | A kind of zigzag tooth end-surface type magnetic fluid seal device |
Non-Patent Citations (1)
| Title |
|---|
| 考虑邻齿效应的直线旋转步进电动机推力计算;孙贤备;杨文焕;;微特电机(09);第24-30页 * |
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