CN109505985B - Reciprocating sealing device for magnetic fluid of hydraulic cylinder - Google Patents
Reciprocating sealing device for magnetic fluid of hydraulic cylinder Download PDFInfo
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- CN109505985B CN109505985B CN201811282962.5A CN201811282962A CN109505985B CN 109505985 B CN109505985 B CN 109505985B CN 201811282962 A CN201811282962 A CN 201811282962A CN 109505985 B CN109505985 B CN 109505985B
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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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Abstract
The invention relates to a reciprocating sealing device for a magnetic fluid of a hydraulic cylinder, which comprises a shell, a pole shoe ring, a permanent magnet ring, a non-magnetic conductive ring and a magnetic isolation ring. The invention provides a magnetic source by utilizing a plurality of permanent magnets, and arranges a non-magnetic conductive ring in a space surrounded by the pole shoe, the permanent magnets, the pole shoe and the shaft, wherein the non-magnetic conductive ring is provided with pole teeth, thereby solving the problem of low pressure resistance of the existing single-magnetic-source magnetic fluid sealing device and multi-magnetic-source magnetic fluid sealing device, and simultaneously solving the problem of low utilization rate of the magnetic fluid in the existing magnetic fluid sealing device.
Description
Technical Field
The invention belongs to the field of mechanical engineering sealing, and particularly relates to a reciprocating sealing device for a magnetic fluid of a hydraulic cylinder.
Background
The magnetic fluid is also called ferromagnetic fluid, and is a colloid material with solid phase and liquid phase formed by mixing magnetic nano particles after special treatment and then uniformly dispersing the magnetic nano particles into liquid, and the colloid material has the liquidity and lubricity of the liquid on one hand and the ferromagnetism of the solid nano particles on the other hand. The magnetic fluid seal is realized by utilizing the capacity of bearing pressure difference of the magnetic fluid under the action of an external magnetic field. At present, the sealing technology is not perfect, and a plurality of defects such as easy leakage, low pressure resistance and the like exist. With the progress of science and technology, the requirements for sealing in some fields are higher and higher, and the traditional sealing mode cannot meet the requirements, so that the magnetic fluid sealing technology plays an increasingly important role.
One of the methods for improving the pressure resistance of the magnetic fluid seal is to increase the number of magnetic sources in the magnetic fluid seal magnetic circuit and improve the shape of the pole shoe, and the sealed part is not designed between the shaft and the pole shoe. Such as the sealing device described in reference 1 (patent publication No. CN 207261664U) and the sealing device described in reference 2 (patent publication No. CN 207278889U). Although the sealing performance of the two sealing devices disclosed in the above documents is greatly improved compared with that of a common magnetic fluid, the requirement of reciprocating sealing of the hydraulic cylinder of the engineering machinery on high sealing performance cannot be met.
Disclosure of Invention
The invention aims to provide a novel hydraulic cylinder magnetic fluid reciprocating sealing device, which utilizes a plurality of permanent magnets to provide a magnetic source, arranges a non-magnetic-conductive ring in a space formed by surrounding pole shoes, the permanent magnets, the pole shoes and a shaft, and arranges pole teeth on the non-magnetic-conductive ring, thereby solving the problem of low pressure resistance of the existing single-magnetic-source magnetic fluid sealing device and multi-magnetic-source magnetic fluid sealing device, and simultaneously solving the problem of low magnetic fluid utilization rate in the existing magnetic fluid sealing device. The whole assembly is simple to process and assemble, so that the sealing technology is successfully applied to hydraulic cylinder sealing with high pressure, high cleanliness and high processing precision requirements, and a great promoting effect is generated for the development of the engineering machinery hydraulic cylinder technology to a certain extent.
The technical scheme of the invention is as follows:
the hydraulic cylinder magnetic fluid reciprocating sealing device comprises a shell, a pole shoe ring, a permanent magnet ring, a non-magnetic conductive ring and a magnetism isolating ring;
a plurality of pole shoe rings and magnetic isolation rings are arranged and are alternately arranged on the inner wall of the shell along the axial direction; the outer edge of the left end face of the pole shoe ring is provided with a radial ring I, and the outer edge of the right end face of the pole shoe ring is provided with a radial ring II; in the two adjacent pole shoe rings, a radial ring I on the right pole shoe ring and a radial ring II on the left pole shoe ring are close to each other, and a magnetic isolating ring is arranged between the two pole shoe rings; the inner circle surface of the pole shoe ring is close to the outer circle surface of the shaft, pole teeth I are arranged on the inner circle surface of the pole shoe ring, the pole teeth I extend to the outer circle surface of the shaft along the radial direction, a gap is reserved between the pole teeth I and the outer circle surface of the shaft, and the gap is filled with magnetic fluid for sealing;
the permanent magnet rings and the non-magnetic conductive rings are also provided with a plurality of groups, the groups are respectively arranged between two adjacent pole shoe rings, the left end surfaces of the permanent magnet rings and the non-magnetic conductive rings are contacted with the right end surface of the left pole shoe ring, the right end surfaces of the permanent magnet rings and the non-magnetic conductive rings are contacted with the left end surface of the right pole shoe ring, the outer circular surface of the permanent magnet rings is respectively contacted with the radial ring I on the right pole shoe ring, the radial ring II on the left pole shoe ring and the inner circular surface of the magnetism isolating ring between the two radial rings, the inner circular surface of the permanent magnet rings is contacted with the outer circular surface of the non-magnetic conductive rings, the outer circular surface of the shaft close to the inner circular surface of the non-magnetic conductive rings is provided with pole teeth II, the pole teeth II extend to the outer circular surface of the shaft along the.
The axial length of each pole shoe ring is sequentially increased along the direction from left to right, and the number of the pole teeth I on the inner circular surface of each pole shoe ring is also sequentially increased, so that the sealing pressure resistance of the magnetic fluid under each pole shoe is sequentially increased from the high-pressure side to the low-pressure side, and the reliability of the sealing performance of the magnetic fluid is improved.
The number of teeth I on the inner circumferential surface of each pole piece ring increases from 1 to 4 in the direction from left to right.
The width and the groove depth of each pole tooth II are consistent with those of each pole tooth I.
The pole shoe ring at the leftmost side is only provided with a radial ring II, and the pole shoe ring at the rightmost side is only provided with a radial ring I; the axial length of each radial ring I is consistent with that of each radial ring II.
The number of the pole teeth II arranged on the inner circular surface of each non-magnetic conductive ring is 3-12.
The pole shoe ring is provided with 2-16 groups.
The size of a gap between the pole tooth I and the outer circular surface of the shaft is 0.05-3 mm; the size of the gap between the pole tooth II and the outer circular surface of the shaft is 0.05-3 mm.
The permanent magnet rings are axial magnetizing permanent magnet rings, and the directions of magnetic lines of force of the adjacent permanent magnet rings are opposite.
A ring groove is arranged on the outer circular surface of each pole shoe ring, and a sealing ring is arranged in the ring groove;
the magnetic field generator also 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 leftmost pole shoe ring, and the right magnetism isolating ring is located on the right side of the rightmost pole shoe ring.
The right end of the shell is provided with an end cover, and the end cover is sleeved on the shaft to seal the whole shell.
The invention designs a non-magnetic conduction device which is positioned in a space surrounded by a pole shoe, a permanent magnet, the pole shoe and a reciprocating shaft, and pole teeth are arranged on the non-magnetic conduction device. The design solves the problem of resource waste caused by the storage of the magnetic fluid in the groove of the original sealing device on one hand, improves the utilization rate of the magnetic fluid, forms larger magnetic field gradient difference on the other hand, and greatly improves the volume of the magnetic fluid participating in the sealing function, thereby improving the pressure resistance and the sealing reliability of the reciprocating sealing of the magnetic fluid. The invention also has the advantages of strong self-repairing capability, convenient installation and the like, further improves the pressure resistance and the sealing reliability of the magnetic fluid seal under the reciprocating sealing condition, and enlarges the safe working range. The invention solves the problem of insufficient pressure resistance of the sealing device under the reciprocating motion condition, and applies the sealing device to engineering machinery.
The invention actually forms a layout structure that the pole shoe rings and the non-magnetic conductive rings are alternately distributed on the outer circle surface of the shaft, and simultaneously forms a staggered distribution structure of the pole teeth I and the pole teeth II, thereby effectively increasing the gradient difference of the magnetic field, improving the sealing effect, reducing the volume of the magnetic fluid and saving the material use cost.
In addition, the width and the groove depth of each pole tooth II are consistent with those of each pole tooth I, so that the cost is further reduced, the gradient difference of a magnetic field is ensured, and the sealing performance is improved.
According to the invention, through the structural layout of the plurality of permanent magnet rings which are axially arranged and have opposite adjacent magnetic force lines, a multi-layer closed magnetic force line loop is formed, so that the magnetic fluid can be more stably stored in the corresponding gap.
Drawings
FIG. 1 is a schematic structural diagram of a hydraulic cylinder magnetic fluid reciprocating sealing device provided by an embodiment of the invention;
the serial number designations and corresponding designations in the drawings are as follows:
1-shaft, 2-shell, 3-pole shoe ring, 4-permanent magnet ring, 5-non-magnetic conductive ring, 6-magnetic isolation ring, 7-radial ring I, 8-radial ring II, 9-pole tooth I, 10-pole tooth II, 11-sealing ring, 12-left magnetic isolation ring, 13-right magnetic isolation ring and 14-end cover.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, the magnetic fluid reciprocating sealing device of the hydraulic cylinder comprises a shell 2, a pole shoe ring 3, a permanent magnet ring 4, a non-magnetic conductive ring 5 and a magnetism isolating ring 6;
a plurality of pole shoe rings 3 and magnetism isolating rings 6 are arranged and are alternately arranged on the inner wall of the shell 2 along the axial direction; the outer edge of the left end face of the pole shoe ring 3 is provided with a radial ring I7, and the outer edge of the right end face of the pole shoe ring 3 is provided with a radial ring II 8; in the two adjacent pole shoe rings 3, a radial ring I7 on the right pole shoe ring 3 and a radial ring II8 on the left pole shoe ring 3 are close to each other, and a magnetism isolating ring 6 is arranged between the two pole shoe rings; the inner circular surface of the pole shoe ring 3 is close to the outer circular surface of the shaft 1, the inner circular surface of the pole shoe ring 3 is provided with pole teeth I9, the pole teeth I9 extend to the outer circular surface of the shaft 1 along the radial direction, a gap is reserved between the pole teeth I9 and the outer circular surface of the shaft 1, and the gap is filled with magnetic fluid for sealing;
the permanent magnet rings 4 and the non-magnetic conductive rings 5 are also provided with a plurality of groups which are respectively arranged between two adjacent pole shoe rings 3, the left end surfaces of the permanent magnet rings 4 and the non-magnetic conductive rings 5 are contacted with the right end surface of the pole shoe ring 3 on the left side, the right end surfaces of the permanent magnet rings 4 and the non-magnetic conductive rings 5 are contacted with the left end surface of the pole shoe ring 3 on the right side, the outer circular surface of the permanent magnet ring 4 is respectively contacted with the radial ring I7 on the right pole shoe ring 3, the radial ring II8 on the left pole shoe ring 3 and the inner circular surface of the magnetism isolating ring 6 between the two radial rings, the inner circular surface of the permanent magnet ring 4 is contacted with the outer circular surface of the non-magnetic conductive ring 5, the inner circle surface of the non-magnetic conductive ring 5 is close to the outer circle surface of the shaft 1, the inner circle surface of the non-magnetic conductive ring 5 is provided with pole teeth II10, the pole teeth II10 extend to the outer circular surface of the shaft 1 along the radial direction, and a gap is reserved between the pole teeth II10 and the outer circular surface of the shaft 1, and the gap is not filled with magnetic fluid.
The axial length of each pole shoe ring 3 is sequentially increased along the direction from left to right, and the number of the pole teeth I9 on the inner circular surface of each pole shoe ring 3 is also sequentially increased, so that the sealing pressure resistance of the magnetic fluid under each pole shoe is sequentially increased from the high-pressure side to the low-pressure side, and the reliability of the sealing performance of the magnetic fluid is improved.
The number of teeth I9 on the inner circumferential surface of each pole shoe ring 3 increases from 1 to 4 in the left-to-right direction.
The width and the groove depth of each pole tooth II10 are consistent with those of each pole tooth I9, so that the manufacturing cost is saved.
The leftmost pole shoe ring 3 is only provided with a radial ring II8, and the rightmost pole shoe ring 3 is only provided with a radial ring I7; the axial length of each radial ring I7 is consistent with that of the radial ring II 8.
The number of the pole teeth II10 arranged on the inner circular surface of each non-magnetic conductive ring 5 is 3-12.
The pole shoe ring 3 is provided with 2-16 groups.
The size of a gap between the pole tooth I9 and the outer circular surface of the shaft 1 is 0.05-3 mm; the size of the clearance between the pole teeth II10 and the outer circular surface of the shaft 1 is 0.05-3 mm.
The permanent magnet rings 4 are axial magnetizing permanent magnet rings, and the directions of the magnetic lines of force of the adjacent permanent magnet rings 4 are opposite.
A ring groove is arranged on the outer circular surface of each pole shoe ring 3, and a sealing ring 11 is arranged in the ring groove;
the magnetic field isolation device also comprises a left magnetic isolation ring 12 and a right magnetic isolation ring 13; the left magnetism isolating ring 12 and the right magnetism isolating ring 13 are arranged on the inner wall of the shell 2, the left magnetism isolating ring 12 is located on the left side of the leftmost pole shoe ring 3, and the right magnetism isolating ring 13 is located on the right side of the rightmost pole shoe ring 3.
An end cover 14 is arranged at the right end of the shell 2, and the end cover 14 is sleeved on the shaft 1 to seal the whole shell 2.
Claims (8)
1. A reciprocating sealing device for a magnetic fluid of a hydraulic cylinder comprises a shell (2), a pole shoe ring (3), a permanent magnet ring (4), a non-magnetic conductive ring (5) and a magnetic isolation ring (6); the method is characterized in that:
a plurality of pole shoe rings (3) and magnetic isolation rings (6) are arranged and are alternately arranged on the inner wall of the shell (2) along the axial direction; the outer edge of the left end face of the pole shoe ring (3) is provided with a radial ring I (7), and the outer edge of the right end face of the pole shoe ring (3) is provided with a radial ring II (8); in two adjacent pole shoe rings (3), a radial ring I (7) on the right pole shoe ring (3) and a radial ring II (8) on the left pole shoe ring (3) are close to each other, and a magnetism isolating ring (6) is arranged between the two pole shoe rings; the inner circular surface of the pole shoe ring (3) is close to the outer circular surface of the shaft (1), pole teeth I (9) are arranged on the inner circular surface of the pole shoe ring (3), the pole teeth I (9) extend to the outer circular surface of the shaft (1) along the radial direction, a gap is reserved between the pole teeth I (9) and the outer circular surface of the shaft (1), and the gap is filled with magnetic fluid for sealing;
the permanent magnet rings (4) and the non-magnetic-conductive rings (5) are also provided with a plurality of groups which are respectively arranged between two adjacent pole shoe rings (3), the left end surfaces of the permanent magnet rings (4) and the non-magnetic-conductive rings (5) are contacted with the right end surface of the pole shoe ring (3) on the left side, the right end surfaces of the permanent magnet rings (4) and the non-magnetic-conductive rings (5) are contacted with the left end surface of the pole shoe ring (3) on the right side, the outer circular surface of the permanent magnet rings (4) is respectively contacted with a radial ring I (7) on the pole shoe ring (3) on the right side, a radial ring II (8) on the pole shoe ring (3) on the left side and the inner circular surface of the magnetism isolating ring (6) between the two radial rings, the inner circular surface of the permanent magnet rings (4) is contacted with the outer circular surface of the non-magnetic-conductive rings (5), the inner circular surface of the non-magnetic, the pole teeth II (10) extend to the outer circular surface of the shaft (1) along the radial direction, a gap is reserved between the pole teeth II and the outer circular surface of the shaft (1), and the gap is not filled with magnetic fluid;
the axial length of each pole shoe ring (3) is increased in sequence along the left-to-right direction, and the number of pole teeth I (9) on the inner circular surface of each pole shoe ring (3) is also increased in sequence;
the permanent magnet rings (4) are axially magnetized, and the directions of magnetic lines of force of the adjacent permanent magnet rings (4) are opposite.
2. The hydraulic cylinder magnetic fluid reciprocating seal device of claim 1, wherein: the number of pole teeth I (9) on the inner circumferential surface of each pole shoe ring (3) increases from 1 to 4 in the direction from left to right.
3. The hydraulic cylinder magnetic fluid reciprocating seal device of claim 1, wherein: the width and the groove depth of each pole tooth II (10) are consistent with those of each pole tooth I (9).
4. The hydraulic cylinder magnetic fluid reciprocating seal device of claim 1, wherein: the leftmost pole shoe ring (3) is only provided with a radial ring II (8), and the rightmost pole shoe ring (3) is only provided with a radial ring I (7); the axial length of each radial ring I (7) is consistent with that of each radial ring II (8).
5. The hydraulic cylinder magnetic fluid reciprocating seal device of claim 1, wherein: the number of the pole teeth II (10) arranged on the inner circle surface of each non-magnetic conductive ring (5) is 3-12.
6. The hydraulic cylinder magnetic fluid reciprocating seal device of claim 1, wherein: the pole shoe ring (3) is provided with 2-16 groups.
7. The hydraulic cylinder magnetic fluid reciprocating seal device of claim 1, wherein:
the size of a gap between the pole tooth I (9) and the outer circular surface of the shaft (1) is 0.05-3 mm; the size of the gap between the pole teeth II (10) and the outer circular surface of the shaft (1) is 0.05-3 mm.
8. The hydraulic cylinder magnetic fluid reciprocating seal device of claim 1, wherein:
a ring groove is arranged on the outer circular surface of each pole shoe ring (3), and a sealing ring (11) is arranged in the ring groove;
the magnetic field isolation device also comprises a left magnetic isolation ring (12) and a right magnetic isolation ring (13); the left magnetism isolating ring (12) and the right magnetism isolating ring (13) are arranged on the inner wall of the shell (2), the left magnetism isolating ring (12) is positioned on the left side of the leftmost pole shoe ring (3), and the right magnetism isolating ring (13) is positioned on the right side of the rightmost pole shoe ring (3);
an end cover (14) is arranged at the right end of the shell (2), the end cover (14) is sleeved on the shaft (1), and the end cover is connected to the inner circular surface of the shell (2) in a threaded manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811282962.5A CN109505985B (en) | 2018-10-31 | 2018-10-31 | Reciprocating sealing device for magnetic fluid of hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811282962.5A CN109505985B (en) | 2018-10-31 | 2018-10-31 | Reciprocating sealing device for magnetic fluid of hydraulic cylinder |
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| Publication Number | Publication Date |
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| CN109505985A CN109505985A (en) | 2019-03-22 |
| CN109505985B true CN109505985B (en) | 2021-03-23 |
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| CN201811282962.5A Active CN109505985B (en) | 2018-10-31 | 2018-10-31 | Reciprocating sealing device for magnetic fluid of hydraulic cylinder |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110425224B (en) * | 2019-07-19 | 2021-07-27 | 南京航空航天大学 | Bearing sealing ring structure of magnetofluid medium |
| CN111963688B (en) * | 2020-08-12 | 2021-11-09 | 清华大学 | Multistage multipolar magnetic powder sealing device |
| CN112283325B (en) * | 2020-09-29 | 2021-09-14 | 清华大学 | Magnetic liquid sealed lubricating transmission device |
| CN112392962A (en) * | 2020-11-11 | 2021-02-23 | 清华大学 | Magnetic fluid sealing device without pole teeth |
| CN113757385A (en) * | 2021-09-07 | 2021-12-07 | 北京交通大学 | Magnetic fluid seal using axially magnetized permanent magnet ring with pole tooth structure |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3740060A (en) * | 1971-11-03 | 1973-06-19 | Avco Corp | A shaft seal |
| US4357022A (en) * | 1980-11-19 | 1982-11-02 | Ferrofluidics Corporation | Ferrofluid rotary-shaft seal apparatus and method |
| JPS61215864A (en) * | 1985-03-19 | 1986-09-25 | Fuji Electric Co Ltd | Magnetic fluid sealing device |
| CN1271358C (en) * | 2003-12-10 | 2006-08-23 | 北京交通大学 | Sealing device with uniformly distributed magnetic liquid |
| CN101377985B (en) * | 2007-08-31 | 2012-08-22 | 湖南维格磁流体股份有限公司 | Dynamic sealing device for middle/high voltage power switchgear |
| CN104315151A (en) * | 2014-09-29 | 2015-01-28 | 北京交通大学 | Method for improving magnetic liquid sealing reliability |
| CN106641273B (en) * | 2017-02-24 | 2018-02-06 | 自贡兆强环保科技股份有限公司 | A kind of chemical reactor magnetic fluid seal device and its control system |
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