CN100360839C - Magnetic liquid sealing device - Google Patents
Magnetic liquid sealing device Download PDFInfo
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- CN100360839C CN100360839C CNB2006100527941A CN200610052794A CN100360839C CN 100360839 C CN100360839 C CN 100360839C CN B2006100527941 A CNB2006100527941 A CN B2006100527941A CN 200610052794 A CN200610052794 A CN 200610052794A CN 100360839 C CN100360839 C CN 100360839C
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Abstract
A sealing device with magnetic liquid is prepared as forming magnetic pole ring by jacketing and superposing external and internal magnetic pole rings or by butt-joint and superposing top and bottom magnetic pole rings, setting adjacent and near permanent magnetic ring used for forming said magnetic pole ring to be at opposite polarity, sealing and erecting dual-superposed magnetic pole rings separately between coaxial gyrorotors to form seal gap for filling in magnetic liquid to realize magnetic liquid seal.
Description
Technical field
The present invention relates to a kind of magnetic fluid sealing technical field, be specially adapted to the higher low rotational resistance technical field of sealing technology of lightweight requirements such as " nuclear ", " life ", " change " sealing protection of each large, medium and small type solid of rotation, the sealing of paddling, the gentle temperature variation of anti-high air pressure and frost protection, also be applicable to technical fields such as general vacuum seal and dust sealing.
Background technique
Magnetic fluid sealing is a kind of advanced dynamic sealing method that adopts local high magnetic fields and magnetic liquid shutoff seal clearance, present magnetic fluid sealing generally adopts sleeve structure, mainly form by parts such as pole shoe ring, permanent-magnetic clamp, magnetic conductive axis or magnetic guiding loops (its rotating shaft simultaneously general also play magnetic conduction effect), have now its magnetism-collected structure of magnetic fluid sealing mainly contain one-sided utmost point tooth magnetism-collected structure, to flute profile magnetic liquid movable sealing structure, multi-stage sealed structure, centrifugal magnetic fluid sealing or the like.Have now and can realize that the magnetic fluid sealing magnetism-collected structure of higher sealing load mainly contains: US 4,527, and 805, US4,865,334, US 5,092,611, US 5,954, and 342, US 6,543,782, US6,672, the multipole tooth magnetic fluid sealings that patent provided such as 592, the centrifugal magnetic fluid sealing of multipole tooth that patents such as US3740060 provide also has US3740060, US 4,293,137, US4,478,424, US4,526,381, US4,605,233, US 4,995, and 622, US 5, the magnetic fluid sealing of the multistage cascades dorsad that patent provided such as 100,159.Though these magnetic liquid sealing structure designs make sealability be improved to a certain extent, but the magnetic flux distribution gradient in its seal clearance path is not very big, have only when the distance of utmost point between cog hour just can be at the distributional difference of the bigger Magnetic flux density of seal clearance path formation.That is to say that its magnetic field, utmost point backlash will produce disperses phenomenon, exists a large amount of useless magnetic fluxs on the seal clearance path, and its magnetic flux distribution difference is significantly diminished when seal clearance is big.
Certainly, can satisfy the sealability requirement of big seal clearance by the size that increases the magnetic fluid sealing magnetism-collected structure, but in general this can doubly increase the size and the weight of seal structural part with 3 power indexes of seal clearance, and this is worthless for some armament systems that structure dimension and weight are had relatively high expectations.How increasing substantially power on the seal clearance path distribute alternately field gradients and amplitude of variation in limited structure space, is very important for further raising magnetic fluid sealing performance and structural compactness thereof.
Summary of the invention
The purpose of this invention is to provide a kind of overlapping magnetic fluid seal device, stack by different magnetic field of permanent magnet, make that useless magnetic flux on the seal clearance path weakens mutually, useful magnetic flux is effectively strengthened, on the seal clearance path, obtain variable gradient and the bigger strong and weak alternate Magnetic field distribution of amplitude, thereby realize the motive sealing of high performance magnetic liquid; Propose low cost of manufacture simultaneously, be convenient to process and increase a kind of magnetic fluid seal device of sealing configuration compactedness and structure adaptability.
Goal of the invention of the present invention is achieved through the following technical solutions: a kind of magnetic fluid seal device, it comprises coaxial rotating body and bearing in relative rotation, between the coaxial rotating body, be provided with the magnetic pole circle of forming alternately by several pole shoe ring and permanent-magnetic clamp, in seal clearance, be filled with sealing medium, it is characterized in that described magnetic pole circle is an antithesis laminated type arranging structure, the polarity of adjacent permanent-magnetic clamp is opposite.
The magnetic pole circle that described antithesis laminated type is arranged is made up of the outer magnetic pole circle and the internal magnetic pole circle of inside and outside suit stack, is directly installed on and aligns arrangement between the coaxial rotating body mutually, and the outer magnetic pole circle is by alternately n
1=2～30 outer pole shoe ring and (n
1-1) individual outer permanent-magnetic clamp is formed; The internal magnetic pole circle is by alternately n
1=2～30 interior pole shoe ring and (n
1-1) individual interior permanent-magnetic clamp is formed.
The magnetic pole circle that described antithesis laminated type is arranged is made up of the outer magnetic pole circle and the internal magnetic pole circle of inside and outside suit stack, be directly installed on and align arrangement between the coaxial rotating body mutually, between outer magnetic pole circle and internal magnetic pole circle are installed in and the sealing of coaxial rotating body is assembled the outer non-magnetic conduction lasso and Nei Fei magnetic conduction lasso.
The magnetic pole circle that described antithesis laminated type is arranged is made up of the outer magnetic pole circle and the internal magnetic pole circle of inside and outside suit stack, be directly installed on and align arrangement between the coaxial rotating body mutually, be respectively equipped with outer utmost point tooth and interior utmost point tooth on the seal clearance face of outer pole shoe ring and interior pole shoe ring.
The magnetic pole circle that described antithesis laminated type is arranged is aligned by the last magnetic pole circle of upper and lower butt joint stack and lower magnetic pole circle and rearranges, and last magnetic pole circle is by alternately n
2Go up pole shoe ring and (n for=2～10
2-1) individual last permanent-magnetic clamp is formed; The lower magnetic pole circle is by alternately n
2=2～10 following pole shoe ring and (n
2-1) individual following permanent-magnetic clamp is formed.
The magnetic pole circle that described antithesis laminated type is arranged is made up of the last magnetic pole circle and the lower magnetic pole circle of upper and lower butt joint stack, and last magnetic pole circle and lower magnetic pole circle are for staggered mutually, and intersection embedding mutually, last magnetic pole circle by 2 upward pole shoe ring and 1 upward permanent-magnetic clamp form; The lower magnetic pole circle is made up of 2 following pole shoe ring and 1 following permanent-magnetic clamp.
The magnetic pole circle that described antithesis laminated type is arranged is made up of the last magnetic pole circle and the lower magnetic pole circle of upper and lower butt joint stack, and last magnetic pole circle and lower magnetic pole circle are embedded arrangement, and last magnetic pole circle is made up of 2 last pole shoe ring and 1 last permanent-magnetic clamp; The lower magnetic pole circle is made up of 1 following pole shoe ring.
Described joint of going up magnetic pole circle and lower magnetic pole circle is fixed with one by fastening piece.
The described permanent-magnetic clamp of going up is formed by the rubber strip that several permanent magnetism sheets embeddings have the respective amount checkerwork cell with following permanent-magnetic clamp.
Described n
1Be 6～10, n
2It is 2～6.n
1And n
2Be positive integer.
Advantage of the present invention is the stack in the magnetic field that produces by different permanent-magnetic clamp, useful magnetic flux on the seal clearance path is strengthened and useless magnetic flux obtains weakening, improve magnetic flux distribution gradient on the seal clearance path greatly, make full use of effective structure space, increase substantially the seal pressure differential and the anti-eccentric vibration sealability of big gap magnetic liquid sealing, particularly the reverse stack by magnetic field is effectively slackened seal ring far field magnetic flux, the overall structure leakage magnetic field is low, can be to week.And structure light and handy, be easy to make, easy to use, with low cost, can solve large revolving body magnetic fluid sealing circle manufacturing difficulty, manufacturing expense is high and uses practical problem such as inconvenience.
Description of drawings
Fig. 1 is suit overlapping embodiment 1 a magnetic liquid sealing structure schematic representation.
Fig. 2 is a seal ring seal clearance path magnetic flux distribution curve.
Fig. 3 is the equivalent cloud atlas of seal ring magnetic flux distribution.
Fig. 4 is suit overlapping embodiment 2 magnetic liquid sealing structure schematic representation.
Fig. 5 is suit overlapping embodiment 3 magnetic liquid sealing structure schematic representation.
Fig. 6 is butt joint overlapping embodiment 4 magnetic liquid sealing structure schematic representation.
Fig. 7 is butt joint overlapping embodiment 5 magnetic liquid sealing structure schematic representation.
Fig. 8 is butt joint overlapping embodiment 6 magnetic liquid sealing structure schematic representation.
Fig. 9 is butt joint overlapping sealing strip junction composition (plan view of Fig. 6).
Figure 10 is upper and lower permanent-magnetic clamp package structure figure.
Embodiment
Below in conjunction with above-mentioned accompanying drawing the present invention is described in further detail.
A kind of magnetic fluid seal device, it comprises coaxial rotating body 1 and 5, bearing 6 between them, between the coaxial rotating body of magnetic conduction or non-magnetic conduction, be provided with the magnetic pole circle of forming antithesis laminated type arranging structure by several pole shoe ring and permanent-magnetic clamp alternately, and the adjacent and contiguous permanent-magnetic clamp polarity of each magnetic pole circle is opposite, be filled with sealing medium 4 in the seal clearance 8 between lamination magnetic pole circle, and by the link of the detachable connection in two ends location and fixing.
Embodiment 1 is shown in Fig. 1～3, and the magnetic pole circle that described antithesis laminated type is arranged is made up of the outer magnetic pole circle 7 and the internal magnetic pole circle 9 of inside and outside suit stack, is directly installed between the coaxial rotating body, aligns arrangement mutually.Outer magnetic pole circle 7 is made up of alternately 6 outer pole shoe ring 3 and 5 outer permanent-magnetic clamps 2, constitutes ‖ N-S ‖ S-N ‖ N-S ‖ S-N ‖ N-S ‖ relation; Internal magnetic pole circle 9 is made up of alternately 6 interior pole shoe ring 3a and 5 interior permanent-magnetic clamp 2a equally, constitutes ‖ S-N ‖ N-S ‖ S-N ‖ N-S ‖ S-N ‖ relation, outer, the interior permanent-magnetic clamp formation of double-deck outer, internal magnetic pole circle
Relation.Magnetic field suit stack by double-deck pole shoe permanent-magnetic clamp is strengthened the gap magnetic field between the contiguous different in nature pole shoe ring, and makes the gap magnetic field between the adjacent same sex pole shoe ring obtain weakening.The equivalent cloud atlas of magnetic flux distribution curve on its seal clearance path and magnetic flux distribution as shown in Figures 2 and 3, the external leakage magnetic field of whole as can see from Figure 2 magnetism-collected structure is lower, and stronger magnetic flux distribution internally only arranged in the pole shoe gap, and Magnetic flux density is lower in the permanent-magnetic clamp gap, magnetic flux distribution graded in seal clearance path is very big as can see from Figure 3, and this is the necessary condition that realizes good magnetic fluid sealing.The sealing medium 4 that is injected in seal clearance will be restrained to inside and outside six pairs in the seal clearance between the pole shoe ring 8, realizes magnetic fluid sealing.
Embodiment 2 as shown in Figure 4, it is a kind of suit overlapping that has non-magnetic conduction lasso, structure is substantially the same manner as Example 1, the outer magnetic pole circle 7 of different is antithesis lamination and internal magnetic pole circle 9 respectively by outer non-magnetic conduction lasso 10 and Nei Fei magnetic conduction lasso 10a, with relatively turnable coaxial rotating body sealing assembling, make its magnetic fluid sealing that not only can be used for non-magnetic conduction solid of rotation, also can realize the magnetic fluid sealing of magnetic conduction type solid of rotation.
Embodiment 3 as shown in Figure 5, its composition is substantially the same manner as Example 1, different is forms on 8 of the seal clearances of outer, the internal magnetic pole circle 7 of antithesis lamination and 9 outer, interior pole shoe ring 3 and 3a and is respectively equipped with outer utmost point tooth 11 and interior utmost point tooth 11a, with further raising sealability.
Embodiment 4 as shown in Figure 6, it is the butt joint overlapping magnetic fluid sealing that a kind of pole shoe aligns mutually, align by last magnetic pole circle 12 and lower magnetic pole circle 13 and to rearrange, be installed in the end face junction of coaxial rotating body, last magnetic pole circle 12 is made up of alternately 3 last pole shoe ring 15 and 2 last permanent-magnetic clamps 14, constitutes ‖ N-S ‖ S-N ‖ relation; Lower magnetic pole circle 13 is made up of 3 following pole shoe ring 15a and 2 following permanent-magnetic clamp 14a alternately, constitutes ‖ S-N ‖ N-S ‖ relation, and the upper and lower permanent-magnetic clamp of double-deck upper and lower magnetic pole circle constitutes
Relation, the direction of magnetization of its adjacent permanent-magnetic clamp is reversed arrangement radially.And the formation seal clearance, by magnetic field superposition, the gap magnetic field between the adjacent same sex pole shoe ring is slackened, and the gap magnetic field between the contiguous different in nature pole shoe ring is strengthened.The sealing medium 4 that is injected will be restrained to three pairs up and down over against upper and lower pole shoe ring between seal clearance 8 in, realize magnetic fluid sealing.
Embodiment 5 as shown in Figure 7, its structure is substantially the same manner as Example 4, different is goes up magnetic pole circle 12 and lower magnetic pole circle 13 is arranged for mutual dislocation, and intersects the butt joint overlaying scheme that embeds mutually, last magnetic pole circle 12 by 2 upward pole shoe ring 15 and 1 upward permanent-magnetic clamp 14 form; Lower magnetic pole circle 13 is made up of 2 following pole shoe ring 15a and 1 following permanent-magnetic clamp 14a, constitutes
Relation, mutual dislocation also embeds, so that its seal clearance size remains unchanged when the upper and lower vibration of solid of rotation, and make the axial magnetic attraction force between the upper and lower magnetic pole circle of upper and lower antithesis lamination be transformed into radially magnetic attraction, thereby alleviate the load of fastening piece.
Embodiment 6 is the mutual embedded arranging structure of the simplest a kind of last magnetic pole circle and lower magnetic pole circle as shown in Figure 8, and last magnetic pole circle 12 goes up pole shoe ring 15 by 2 and 1 last permanent-magnetic clamp 14 is formed; 13 on lower magnetic pole circle is made up of 1 following pole shoe ring 15a, and inserts 2 of going up the magnetic pole circle and go up between the pole shoe ring, and simplified structure reduces manufacture difficulty so greatly.
On the embodiment 4～5, the lower magnetic pole circle is bigger because of specification, adopt the magnetic pole circle of open type in the specific implementation, shown in Fig. 9～10, on, joint 17 places of lower magnetic pole circle adopt fastening piece 16 to be fixed with one, no matter be that last permanent-magnetic clamp 14 or following permanent-magnetic clamp 14a form by the rubber strip 18 that several permanent magnetism sheets 19 embeddings have the respective amount checkerwork cell, the checkerwork cell rubber strip is sandwiched in, realize between the following pole shoe ring last, the encapsulation of following permanent-magnetic clamp, assemble with relatively turnable coaxial rotating body 1 and 5 sealings respectively by sealer and tab fasteners, and by bearing 6 mutually to the dress coaxial positioning, make, following pole shoe ring and last, following permanent-magnetic clamp aligns mutually or mutual dislocation embeds, and constitutes double-deck pole shoe permanent magnetism circular row.
Claims (11)
1, a kind of magnetic fluid seal device, it comprises coaxial rotating body (1,5) and bearing (6) in relative rotation, between the coaxial rotating body, be provided with the magnetic pole circle of forming alternately by several pole shoe ring and permanent-magnetic clamp, in seal clearance (8), be filled with sealing medium (4), it is characterized in that described magnetic pole circle is an antithesis laminated type arranging structure, the polarity of adjacent permanent-magnetic clamp is opposite.
2, magnetic fluid seal device according to claim 1, the magnetic pole circle that it is characterized in that described antithesis laminated type arrangement is made up of the outer magnetic pole circle (7) and the internal magnetic pole circle (9) of inside and outside suit stack, be directly installed on and align arrangement between the coaxial rotating body mutually, outer magnetic pole circle (7) is by alternately n
1=2～30 outer pole shoe ring (3) and (n
1-1) individual outer permanent-magnetic clamp (2) is formed; Internal magnetic pole circle (9) is by alternately n
1=2～30 interior pole shoe ring (3a) and (n
1-1) individual interior permanent-magnetic clamp (2a) is formed.
3, magnetic fluid seal device according to claim 1, the magnetic pole circle that it is characterized in that described antithesis laminated type arrangement is made up of the outer magnetic pole circle (7) and the internal magnetic pole circle (9) of inside and outside suit stack, be directly installed on and align arrangement between the coaxial rotating body mutually, between outer magnetic pole circle and internal magnetic pole circle are installed in and the sealing of coaxial rotating body is assembled the outer non-magnetic conduction lasso (10) and interior non-magnetic conduction lasso (10a).
4, magnetic fluid seal device according to claim 1, the magnetic pole circle that it is characterized in that described antithesis laminated type arrangement is made up of the outer magnetic pole circle (7) and the internal magnetic pole circle (9) of inside and outside suit stack, be directly installed on and align arrangement between the coaxial rotating body mutually, be respectively equipped with outer utmost point tooth (11) and interior utmost point tooth (11a) on the seal clearance face of outer pole shoe ring and interior pole shoe ring.
5, magnetic fluid seal device according to claim 1, it is characterized in that magnetic pole circle that described antithesis laminated type arranges is aligned by the last magnetic pole circle (12) of upper and lower butt joint stack and lower magnetic pole circle (13) rearranges, and last magnetic pole circle (12) is by alternately n
2Go up pole shoe ring (15) and (n for=2～10
2-1) individual last permanent-magnetic clamp (14) is formed; Lower magnetic pole circle (13) is by alternately n
2=2～10 following pole shoe ring (15a) and (n
2-1) individual following permanent-magnetic clamp (14a) is formed.
6, magnetic fluid seal device according to claim 1, the magnetic pole circle that it is characterized in that described antithesis laminated type arrangement is made up of the last magnetic pole circle (12) and the lower magnetic pole circle (13) of upper and lower butt joint stack, last magnetic pole circle and lower magnetic pole circle are for staggered mutually, and mutually intersect and embed, last magnetic pole circle (12) by 2 go up pole shoe ring (15) and 1 upward permanent-magnetic clamp (14) form; Lower magnetic pole circle (13) is made up of 2 following pole shoe ring (15a) and 1 following permanent-magnetic clamp (14a).
7, magnetic fluid seal device according to claim 1, the magnetic pole circle that it is characterized in that described antithesis laminated type arrangement is made up of the last magnetic pole circle (12) and the lower magnetic pole circle (13) of upper and lower butt joint stack, last magnetic pole circle and lower magnetic pole circle are embedded arrangement, and last magnetic pole circle (12) is made up of 2 last pole shoe ring (15) and 1 last permanent-magnetic clamp (14); Lower magnetic pole circle (13) is made up of 1 following pole shoe ring (15a).
8,, it is characterized in that the joint (17) of described upward magnetic pole circle (12) and lower magnetic pole circle (13) is located to be fixed with one by fastening piece (16) according to each described magnetic fluid seal device of claim 5～7.
9,, it is characterized in that described upward permanent-magnetic clamp (14) and following permanent-magnetic clamp (14a) embed the rubber strip (18) with respective amount checkerwork cell by several permanent magnetism sheets (19) and form according to each described magnetic fluid seal device of claim 5～7.
10, magnetic fluid seal device according to claim 2 is characterized in that described n
1It is 6～10.
11, magnetic fluid seal device according to claim 5 is characterized in that described n
2It is 2～6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100527941A CN100360839C (en) | 2006-08-01 | 2006-08-01 | Magnetic liquid sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100527941A CN100360839C (en) | 2006-08-01 | 2006-08-01 | Magnetic liquid sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1912428A CN1912428A (en) | 2007-02-14 |
| CN100360839C true CN100360839C (en) | 2008-01-09 |
Family
ID=37721442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100527941A Active CN100360839C (en) | 2006-08-01 | 2006-08-01 | Magnetic liquid sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100360839C (en) |
Cited By (1)
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| CN106151526A (en) * | 2016-08-15 | 2016-11-23 | 广西科技大学 | A kind of split-type labyrinth type device for sealing magnetic fluid |
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| EP2267350B1 (en) * | 2008-04-03 | 2016-01-06 | Eagle Industry Co., Ltd. | Rotary joint |
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| CN109268507A (en) * | 2018-10-29 | 2019-01-25 | 广西科技大学 | A kind of more ring-like device for sealing magnetic fluid of magnetic source magnetic conduction |
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| CN112728108B (en) * | 2021-01-12 | 2022-02-01 | 清华大学 | Magnetic field adjustable magnetic liquid sealing device |
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| US4605233A (en) * | 1982-09-16 | 1986-08-12 | Rigaku Keisoku Kabushiki Kaisha | Magnetic fluid sealing device |
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| Publication number | Publication date |
|---|---|
| CN1912428A (en) | 2007-02-14 |
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