CN109505984B - Square magnetic fluid sealing device with multiple magnetic sources - Google Patents
Square magnetic fluid sealing device with multiple magnetic sources Download PDFInfo
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- CN109505984B CN109505984B CN201811274645.9A CN201811274645A CN109505984B CN 109505984 B CN109505984 B CN 109505984B CN 201811274645 A CN201811274645 A CN 201811274645A CN 109505984 B CN109505984 B CN 109505984B
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- ring
- pole shoe
- permanent magnet
- shoe ring
- pole
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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 square magnetic fluid sealing device with multiple magnetic sources, which comprises a shell, a left pole shoe ring, a right pole shoe ring, an inner pole shoe ring, an outer pole shoe ring, a left permanent magnet ring, a right permanent magnet ring, and a right permanent magnet ring. The invention solves the problem that the existing sealing device has the eccentricity of the rotating shaft so as to influence the pressure resistance of the sealing device, and the sealing technology is successfully applied to the occasions with large-shaft-diameter rotation.
Description
Technical Field
The invention belongs to the field of mechanical engineering sealing, and particularly relates to a square magnetic fluid sealing device with multiple magnetic sources.
Background
In the magnetic liquid seal of a large-diameter rotating shaft, due to the influence of factors such as machining assembly errors and vibration, the rotating shaft is eccentric relative to a pole shoe, and the pressure resistance of the magnetic liquid seal is reduced, so that the improvement of the pressure resistance of the large-gap magnetic liquid seal is one of the hot problems in the current research.
One of the methods of reducing the influence of the eccentricity of the rotating shaft on the pressure resistance of the magnetic fluid seal is by improving a magnetic fluid seal structure such as a seal device described in reference 1 (patent publication No. CN 105465373A). Although the sealing device described in the above document has greatly improved sealing performance compared with the common magnetic fluid, the sealing device does not consider the influence of the eccentricity of the rotating shaft on the pressure resistance of the magnetic fluid seal.
The magnetic fluid seal is characterized in that the magnetic fluid is firmly fixed in the seal gap by utilizing the magnetic field force generated by the permanent magnet in the seal gap to resist the pressure difference at two sides, thereby achieving the sealing effect.
Disclosure of Invention
The invention aims to provide a square magnetic fluid sealing device with multiple magnetic sources, so that the problem that the pressure resistance of the sealing device is affected due to the eccentricity of a rotating shaft of the conventional sealing device is solved, and the sealing technology is successfully applied to occasions with large-shaft-diameter rotation.
The technical scheme of the invention is as follows:
the square magnetic fluid sealing device with the multiple magnetic sources comprises a shell, a left pole shoe ring, a right pole shoe ring, an inner pole shoe ring, an outer pole shoe ring, a left permanent magnet ring, a right permanent magnet ring and a right permanent magnet ring;
the inner pole shoe ring is sleeved on the shaft, the outer pole shoe ring is arranged on the inner wall of the shell, the inner pole shoe ring and the outer pole shoe ring correspond to each other, and a gap is reserved between the outer circular surface of the inner pole shoe ring and the inner circular surface of the outer pole shoe ring; the inner circular surface of the outer pole shoe ring is provided with pole teeth I, the pole teeth I extend towards the outer circular surface of the inner pole shoe ring along the radial direction, a gap is reserved between the pole teeth I and the outer circular surface of the inner pole shoe ring, and the gap is filled with magnetic fluid for sealing;
the left pole shoe ring, the right pole shoe ring and the outer permanent magnet ring are arranged on the inner wall of the shell and are respectively positioned on the left side and the right side of the outer pole shoe ring, a left two-permanent-magnet ring is arranged between the left pole shoe ring and the outer pole shoe ring, a right two-permanent-magnet ring is arranged between the right pole shoe ring and the outer pole shoe ring, and a space is reserved between the left two-permanent-magnet ring and the outer circular surface of the inner pole shoe ring and between the right two-permanent-magnet ring and the outer circular surface of the inner;
the left pole shoe ring and the right pole shoe ring respectively extend to the outer circular surface of the shaft along the radial direction, and a space is reserved between the left pole shoe ring and the outer circular surface of the shaft;
the right end surface of the left pole shoe ring is close to the shaft and corresponds to the left end surface of the inner pole shoe ring; the left end face of the inner pole shoe ring is provided with a ring groove I, a left permanent magnet ring is arranged in the ring groove I, the right end face of the left pole shoe ring is provided with a pole tooth II corresponding to the ring groove I, the pole tooth II axially extends towards the left end face of the left permanent magnet ring, a gap is reserved between the pole tooth II and the left end face of the left permanent magnet ring, and the gap is filled with magnetic fluid for sealing;
the left end surface of the right pole shoe ring close to the shaft corresponds to the right end surface of the inner pole shoe ring; the right end face of interior pole shoe ring on be equipped with annular II, annular II in be equipped with right side a permanent magnet ring, the left end face of right side pole shoe ring correspond annular II and be equipped with utmost point tooth III on the position, utmost point tooth III along the axial right-hand member face of a right side permanent magnet ring extend, leave the clearance with the right-hand member face of a right side permanent magnet ring, it seals to fill magnetic fluid in this clearance.
The axial length of the outer pole shoe ring is less than the axial length of the inner pole shoe ring.
The number of the pole teeth II arranged on the right end face of the left pole shoe ring is 2-5;
the number of the pole teeth III arranged on the left end face of the right pole shoe ring is 2-5.
The inner circular surface of the outer pole shoe ring is provided with 1-10 pole teeth I.
The size of a gap between the pole tooth I and the outer circular surface of the inner pole shoe ring is 0.05-3 mm; the size of a gap between the pole tooth II and the left end face of the left integrated permanent magnet ring is 0.05-3 mm; the size of the gap between the pole tooth III and the right end face of the right permanent magnet ring is 0.05-3 mm.
The left permanent magnet ring, the left two permanent magnet rings, the right one permanent magnet ring and the right two permanent magnet rings are axial magnetizing permanent magnet rings;
the directions of the magnetic lines of force of the left permanent magnet ring I and the left permanent magnet ring II are opposite; the directions of the magnetic lines of force of the right permanent magnet ring are opposite; the directions of the magnetic lines of force of the left permanent magnet ring and the right permanent magnet ring are opposite; the directions of the magnetic lines of force of the left two permanent magnet rings are opposite to those of the right two permanent magnet rings.
And annular grooves III are formed in the outer circular surfaces of the left pole shoe ring and the right pole shoe ring, and sealing rings are arranged in the annular grooves III.
The square magnetic fluid sealing device with multiple magnetic sources further comprises a left magnetism isolating ring and a right magnetism isolating ring; the left magnetism isolating ring and the right magnetism isolating ring are arranged on the inner wall of the shell, the left magnetism isolating ring is located on the left side of the left pole shoe ring, and the right magnetism isolating ring is located on the right side of the right pole shoe ring.
The square magnetic fluid sealing device with the multiple magnetic sources further comprises a left bearing and a right bearing, wherein the left bearing and the right bearing are respectively sleeved on the shaft, and the left bearing is arranged on the left side of the left magnetism isolating ring and is in contact with the left magnetism isolating ring; the right bearing is arranged on the right side of the right magnetism isolating ring and is in contact with the right magnetism isolating ring.
The invention designs the square pole shoe, the pole teeth are designed in the radial direction of the left pole shoe and the right pole shoe and the axial direction of the inner circular surface of the outer pole shoe, the permanent magnets are arranged at the positions corresponding to the pole teeth on the left and the right pole shoes at the two ends of the inner pole shoe, so that the left pole shoe, the right pole shoe and the inner pole shoe form a radial sealing space, the outer pole shoe and the inner pole shoe form an axial sealing space, and meanwhile, magnetic fluid is injected into gaps among the left pole shoe, the right pole shoe, the outer pole shoe and the inner pole shoe, thereby realizing the square magnetic fluid sealing device with double magnetic sources. The invention overcomes the problem that the sealing performance of the existing sealing device is reduced due to the loss of magnetic fluid caused by the eccentricity of the rotating shaft under the condition of high speed and heavy load, reduces the influence of the loss of the magnetic fluid caused by the eccentricity of the rotating shaft on the pressure resistance of the sealing device by adopting the structural design of the square pole shoe, improves the pressure resistance and the sealing reliability of the magnetic fluid seal under the condition of large shaft diameter, and enlarges the safe working range of the sealing device.
According to the invention, the magnetic force lines of the left permanent magnet ring, the left two permanent magnet rings, the right one permanent magnet ring and the right two permanent magnet rings are arranged in the direction, so that a multi-layer closed magnetic force line loop is formed, and the magnetic fluid can be more stably stored in the corresponding gap.
Drawings
Fig. 1 is a schematic structural diagram of a square magnetic fluid sealing device with multiple magnetic sources according to an embodiment of the present invention;
the serial number designations and corresponding designations in the drawings are as follows:
1-shaft, 2-shell, 3-left pole shoe ring, 4-right pole shoe ring, 5-inner pole shoe ring, 6-outer pole shoe ring, 7-left permanent magnet ring, 8-left permanent magnet ring, 9-right permanent magnet ring, 10-right permanent magnet ring, 11-pole tooth I, 12-pole tooth II, 13-pole tooth III, 14-sealing ring, 15-left magnetism isolating ring, 16-right magnetism isolating ring, 17-left bearing, 18-right bearing and 19-end cover.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, the square magnetic fluid sealing device with multiple magnetic sources comprises a shell 2, a left pole shoe ring 3, a right pole shoe ring 4, an inner pole shoe ring 5, an outer pole shoe ring 6, a left permanent magnet ring 7, a left permanent magnet ring 8, a right permanent magnet ring 9 and a right permanent magnet ring 10;
the inner pole shoe ring 5 is sleeved on the shaft 1, the outer pole shoe ring 6 is arranged on the inner wall of the shell 2, the inner pole shoe ring 5 and the outer pole shoe ring 6 correspond to each other, and a gap is reserved between the outer circular surface of the inner pole shoe ring 5 and the inner circular surface of the outer pole shoe ring 6; the inner circular surface of the outer pole shoe ring 6 is provided with pole teeth I11, the pole teeth I11 radially extend towards the outer circular surface of the inner pole shoe ring 5, a gap is reserved between the pole teeth I11 and the outer circular surface of the inner pole shoe ring 5, and the gap is filled with magnetic fluid for sealing;
the left pole shoe ring 3, the right pole shoe ring 4 and the outer permanent magnet ring 8 are arranged on the inner wall of the shell 2 and are respectively positioned on the left side and the right side of the outer pole shoe ring 6, a left two permanent magnet ring 8 is arranged between the left pole shoe ring 3 and the outer pole shoe ring 6, a right two permanent magnet ring 10 is arranged between the right pole shoe ring 4 and the outer pole shoe ring 6, and a space is reserved between the left two permanent magnet ring 8 and the right two permanent magnet ring 10 and the outer circular surface of the inner pole shoe ring 5;
the left pole shoe ring 3 and the right pole shoe ring 4 respectively extend to the outer circular surface of the shaft 1 along the radial direction, and a space is reserved between the left pole shoe ring and the outer circular surface of the shaft 1;
the right end surface of the left pole shoe ring 3 close to the shaft 1 corresponds to the left end surface of the inner pole shoe ring 5; the left end face of the inner pole shoe ring 5 is provided with a ring groove I, a left permanent magnet ring 7 is arranged in the ring groove I, the right end face of the left pole shoe ring 3 is provided with pole teeth II12 at the position corresponding to the ring groove I, the pole teeth II12 axially extend to the left end face of the left permanent magnet ring 7, a gap is reserved between the pole teeth II12 and the left end face of the left permanent magnet ring 7, and the gap is filled with magnetic fluid for sealing;
the left end surface of the right pole shoe ring 4 close to the shaft 1 corresponds to the right end surface of the inner pole shoe ring 5; the right end face of interior utmost point boots ring 5 on be equipped with annular II, annular II in be equipped with a right side permanent magnet ring 9, the left end face of right side utmost point shoes ring 4 correspond and be equipped with utmost point tooth III13 on the annular II position, utmost point tooth III13 extend along the axial right end face to a right side permanent magnet ring 9, leave the clearance with the right end face of a right side permanent magnet ring 9 between, it seals to fill in the magnetic fluid in this clearance.
The axial length of the outer pole shoe ring 6 is less than the axial length of the inner pole shoe ring 5.
The number of the pole teeth II12 arranged on the right end face of the left pole shoe ring 3 is 2-5;
the number of the pole teeth III13 arranged on the left end face of the right pole shoe ring 4 is 2-5.
The number of the pole teeth I11 arranged on the inner circular surface of the outer pole shoe ring 6 is 1-10.
The size of a gap between the pole tooth I11 and the outer circular surface of the inner pole shoe ring 5 is 0.05-3 mm; the size of a gap between the pole tooth II12 and the left end face of the left permanent magnet ring 7 is 0.05-3 mm; the size of the gap between the pole tooth III13 and the right end face of the right permanent magnet ring 9 is 0.05-3 mm.
The left permanent magnet ring 7, the left permanent magnet rings 8, the right permanent magnet ring 9 and the right permanent magnet rings 10 are axial magnetizing permanent magnet rings;
the directions of the magnetic lines of the left permanent magnet ring 7 and the left permanent magnet ring 8 are opposite; the directions of the magnetic lines of the right permanent magnet ring 9 and the right permanent magnet ring 10 are opposite; the direction of the magnetic lines of the left permanent magnet ring 7 is opposite to that of the right permanent magnet ring 9; the directions of the magnetic lines of the left two permanent magnet rings 8 and the right two permanent magnet rings 10 are opposite.
And annular grooves III are formed in the outer circular surfaces of the left pole shoe ring 3 and the right pole shoe ring 4, and sealing rings 14 are arranged in the annular grooves III.
The square magnetic fluid sealing device with multiple magnetic sources further comprises a left magnetism isolating ring 15 and a right magnetism isolating ring 16; the left magnetism isolating ring 15 and the right magnetism isolating ring 16 are arranged on the inner wall of the shell 2, the left magnetism isolating ring 15 is positioned on the left side of the left pole shoe ring 3, and the right magnetism isolating ring 16 is positioned on the right side of the right pole shoe ring 4.
The square magnetic fluid sealing device with the multiple magnetic sources further comprises a left bearing 17 and a right bearing 18, wherein the left bearing 17 and the right bearing 18 are respectively sleeved on the shaft 1, and the left bearing 17 is arranged on the left side of the left magnetism isolating ring 15 and is in contact with the left magnetism isolating ring 15; the right bearing 18 is arranged on the right side of the right magnetism isolating ring 16 and is in contact with the right magnetism isolating ring 16.
Claims (8)
1. A square magnetic fluid sealing device with multiple magnetic sources comprises a shell (2), a left pole shoe ring (3), a right pole shoe ring (4), an inner pole shoe ring (5), an outer pole shoe ring (6), a left one-body permanent magnet ring (7), a left two-body permanent magnet ring (8), a right one-body permanent magnet ring (9) and a right two-body permanent magnet ring (10); the method is characterized in that:
the inner pole shoe ring (5) is sleeved on the shaft (1), the outer pole shoe ring (6) is arranged on the inner wall of the shell (2), the inner pole shoe ring (5) and the outer pole shoe ring (6) correspond to each other, and a gap is reserved between the outer circular surface of the inner pole shoe ring (5) and the inner circular surface of the outer pole shoe ring (6); the inner circular surface of the outer pole shoe ring (6) is provided with pole teeth I (11), the pole teeth I (11) extend to the outer circular surface of the inner pole shoe ring (5) along the radial direction, a gap is reserved between the pole teeth I (11) and the outer circular surface of the inner pole shoe ring (5), and the gap is filled with magnetic fluid for sealing;
the left pole shoe ring (3), the right pole shoe ring (4), the left two permanent magnet rings (8) and the right two permanent magnet rings (10) are arranged on the inner wall of the shell (2) and are respectively positioned on the left side and the right side of the outer pole shoe ring (6), the left two permanent magnet rings (8) are arranged between the left pole shoe ring (3) and the outer pole shoe ring (6), the right two permanent magnet rings (10) are arranged between the right pole shoe ring (4) and the outer pole shoe ring (6), and intervals are reserved between the outer circular surfaces of the left two permanent magnet rings (8), the right two permanent magnet rings (10) and the inner pole shoe ring (5);
the left pole shoe ring (3) and the right pole shoe ring (4) respectively extend to the outer circular surface of the shaft (1) along the radial direction, and a space is reserved between the left pole shoe ring and the outer circular surface of the shaft (1);
the right end surface of the left pole shoe ring (3) close to the shaft (1) corresponds to the left end surface of the inner pole shoe ring (5); the left end face of the inner pole shoe ring (5) is provided with a ring groove I, a left permanent magnet ring (7) is arranged in the ring groove I, the right end face of the left pole shoe ring (3) is provided with pole teeth II (12) at the position corresponding to the ring groove I, the pole teeth II (12) axially extend to the left end face of the left permanent magnet ring (7), a gap is reserved between the pole teeth II and the left end face of the left permanent magnet ring (7), and magnetic fluid is filled in the gap for sealing;
the left end surface of the right pole shoe ring (4) close to the shaft (1) corresponds to the right end surface of the inner pole shoe ring (5); an annular groove II is formed in the right end face of the inner pole shoe ring (5), a right permanent magnet ring (9) is arranged in the annular groove II, pole teeth III (13) are arranged on the left end face of the right pole shoe ring (4) in a position corresponding to the annular groove II, the pole teeth III (13) axially extend to the right end face of the right permanent magnet ring (9), a gap is reserved between the pole teeth III (13) and the right end face of the right permanent magnet ring (9), and magnetic fluid is filled in the gap for sealing;
the left permanent magnet ring (7), the left permanent magnet ring (8), the right permanent magnet ring (9) and the right permanent magnet ring (10) are all axial magnetizing permanent magnet rings;
the directions of the magnetic lines of force of the left permanent magnet ring (7) and the left permanent magnet ring (8) are opposite; the directions of the magnetic lines of force of the right permanent magnet ring (9) and the right permanent magnet ring (10) are opposite; the directions of magnetic lines of force of the left permanent magnet ring (7) and the right permanent magnet ring (9) are opposite; the directions of the magnetic lines of force of the left two permanent magnet rings (8) and the right two permanent magnet rings (10) are opposite;
the axial length of the outer pole shoe ring (6) is less than that of the inner pole shoe ring (5).
2. A multi-magnetic source square magnetic fluid sealing device as claimed in claim 1, wherein: the number of the pole teeth II (12) arranged on the right end face of the left pole shoe ring (3) is 2-5.
3. A multi-magnetic source square magnetic fluid sealing device as claimed in claim 1, wherein: the number of the pole teeth III (13) arranged on the left end face of the right pole shoe ring (4) is 2-5.
4. A multi-magnetic source square magnetic fluid sealing device as claimed in claim 1, wherein: the inner circular surface of the outer pole shoe ring (6) is provided with 1-10 pole teeth I (11).
5. A multi-magnetic source square magnetic fluid sealing device as claimed in claim 1, wherein: the size of a gap between the pole tooth I (11) and the outer circular surface of the inner pole shoe ring (5) is 0.05-3 mm; the size of a gap between the pole tooth II (12) and the left end face of the left integrated permanent magnet ring (7) is 0.05-3 mm; the size of a gap between the pole tooth III (13) and the right end face of the right permanent magnet ring (9) is 0.05-3 mm.
6. A multi-magnetic source square magnetic fluid sealing device as claimed in claim 1, wherein: and annular grooves III are formed in the outer circular surfaces of the left pole shoe ring (3) and the right pole shoe ring (4), and sealing rings (14) are arranged in the annular grooves III.
7. A multi-magnetic source square magnetic fluid sealing device as claimed in claim 1, wherein: the magnetic field isolation device also comprises a left magnetism isolation ring (15) and a right magnetism isolation ring (16); the left magnetism isolating ring (15) and the right magnetism isolating ring (16) are arranged on the inner wall of the shell (2), the left magnetism isolating ring (15) is located on the left side of the left pole shoe ring (3), and the right magnetism isolating ring (16) is located on the right side of the right pole shoe ring (4).
8. A multi-magnetic source square magnetic fluid sealing device as claimed in claim 1, wherein: the magnetic bearing is characterized by further comprising a left bearing (17) and a right bearing (18), wherein the left bearing (17) and the right bearing (18) are respectively sleeved on the shaft (1), and the left bearing (17) is arranged on the left side of the left magnetism isolating ring (15) and is in contact with the left magnetism isolating ring (15); the right bearing (18) is arranged on the right side of the right magnetism isolating ring (16) and is in contact with the right magnetism isolating ring (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811274645.9A CN109505984B (en) | 2018-10-30 | 2018-10-30 | Square magnetic fluid sealing device with multiple magnetic sources |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811274645.9A CN109505984B (en) | 2018-10-30 | 2018-10-30 | Square magnetic fluid sealing device with multiple magnetic sources |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109505984A CN109505984A (en) | 2019-03-22 |
| CN109505984B true CN109505984B (en) | 2020-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811274645.9A Active CN109505984B (en) | 2018-10-30 | 2018-10-30 | Square magnetic fluid sealing device with multiple magnetic sources |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007258573A (en) * | 2006-03-24 | 2007-10-04 | Eagle Ind Co Ltd | Magnetic fluid sealing device |
| CN205824188U (en) * | 2016-07-28 | 2016-12-21 | 广西科技大学 | A kind of magnetic fluid seal device of magnetic source tandem type |
| CN107956882B (en) * | 2017-12-13 | 2023-05-05 | 广西科技大学 | Multistage disc magnetic fluid sealing device |
| CN207584031U (en) * | 2017-12-13 | 2018-07-06 | 广西科技大学 | A kind of embedded device for sealing magnetic fluid of magnetic source |
| CN107882999B (en) * | 2017-12-13 | 2023-05-02 | 广西科技大学 | Magnetic source embedded magnetic fluid sealing device |
| CN207634699U (en) * | 2017-12-14 | 2018-07-20 | 广西科技大学 | A kind of radially type labyrinth type device for sealing magnetic fluid |
| CN207554797U (en) * | 2017-12-14 | 2018-06-29 | 广西科技大学 | A kind of telescopic device for sealing magnetic fluid of mixed type |
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2018
- 2018-10-30 CN CN201811274645.9A patent/CN109505984B/en active Active
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