CN112963538A - Magnetic powder and magnetic liquid combined sealing device - Google Patents
Magnetic powder and magnetic liquid combined sealing device Download PDFInfo
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- CN112963538A CN112963538A CN202110372566.7A CN202110372566A CN112963538A CN 112963538 A CN112963538 A CN 112963538A CN 202110372566 A CN202110372566 A CN 202110372566A CN 112963538 A CN112963538 A CN 112963538A
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- magnetic
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- pole shoes
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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
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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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention discloses a magnetic powder and magnetic liquid combined sealing device, which comprises a shell, a magnetic conduction shaft, a plurality of pole shoes, a magnetic source, magnetic powder, magnetic liquid, a magnetism isolating ring, a bearing, a sealing ring and a threaded end cover, wherein the shell is provided with a flange and a shell cavity, and the magnetic conduction shaft penetrates through the shell; the magnetic pole shoes are arranged in the shell cavity at intervals in the axial direction, and the magnetic sources are arranged between the pole shoes in the axial direction, wherein a first gap is formed between the first pole shoes and the magnetic conduction shaft in the radial direction, a plurality of first pole teeth are arranged on the first pole shoes, the first pole teeth are provided with first tooth widths, a second gap is formed between the second pole shoes and the magnetic conduction shaft in the radial direction, a plurality of second pole teeth are arranged on the second pole shoes, the second pole teeth are provided with second tooth widths, the first gap is larger than the second gap, the first tooth widths are larger than the second tooth widths, magnetic powder is arranged in the first gap, magnetic liquid is arranged in the second gap, and the magnetic sources generate magnetic fields which are usually permanent magnets or electromagnets. The sealing device has the advantages of strong pressure resistance and high reliability.
Description
Technical Field
The invention relates to a magnetic powder and magnetic liquid combined sealing device, and belongs to the field of mechanical engineering sealing.
Background
The magnetic liquid is a nano-scale functional material and comprises three parts, namely magnetic particles, a surfactant and a base carrier liquid, wherein the particle size of the magnetic particles is about 10nm generally, and the surfactant coats the magnetic particles, so that the magnetic particles are uniformly dispersed in the base carrier liquid and do not generate agglomeration. The magnetic liquid seal has the characteristics of zero leakage, strong reliability, simple structure, small abrasion, long service life and the like, and is widely applied to the engineering field. However, in the related art, problems in four aspects need to be solved, and firstly, the magnetic liquid has relatively small sealing pressure resistance and is not suitable for being used in a high-pressure environment; secondly, after the magnetic liquid seal reaches the pressure-resistant strength limit, the magnetic liquid seal ring can be rapidly broken, and the magnetic liquid can be flushed out of a seal gap, so that a large amount of sealing medium can be rapidly leaked, and the buffer time of slow leakage is almost not existed; thirdly, the magnetic liquid in the sealing gap in the magnetic liquid seal is evaporated, and the longer the time is, the larger the evaporation amount is, which can greatly reduce the sealing life of the magnetic liquid; fourthly, the sealing gap of the magnetic liquid is very small, usually 0.1-0.3mm, the magnetic liquid in the sealing gap is easily polluted by particles such as dust and water vapor in the environment, even the polluted particles enter the sealing gap to damage the sealing of the magnetic liquid, and the sealing life of the magnetic liquid is shortened.
Magnetic powder sealing is a sealing form in which magnetic particles are used as a main body, and micro-nano magnetic powder (hereinafter referred to as "magnetic powder") is modified by a surfactant, a lubricant and the like to be used as a sealing medium. The magnetic powder sealing is a high-performance novel sealing technology, and compared with the traditional sealing mode, the magnetic powder sealing has the advantages of low leakage rate, high pressure difference resistance, extreme temperature resistance, high reliability, capability of improving the pressure resistance under a specific environment by modifying the surface of magnetic powder, and the like. However, in the related art, the magnetic powder is a porous medium substance under the action of the magnetic field, so the sealed medium can pass through the pores, thereby causing micro leakage of the sealed medium, and the zero leakage requirement of the sealed medium cannot be met.
Disclosure of Invention
In order to solve the above problems, embodiments of the present invention provide a magnetic powder and magnetic liquid combined sealing device, which can withstand a large pressure difference while ensuring zero leakage, and slowly leak after a zero leakage seal fails, thereby providing a reaction time, slowing down evaporation of magnetic liquid, improving a service life, preventing a seal gap from being polluted by an environment, improving a service life, and sputtering the magnetic liquid seal ring to the magnetic powder seal ring after the magnetic liquid seal ring is broken, so that the magnetic liquid and the magnetic powder are mixed to form a new seal ring, and continuously exerting a pressure-resistant effect.
A magnetic powder and magnetic liquid combined sealing device according to an embodiment of the present invention includes: a housing having a flange and a housing cavity; the magnetic conduction shaft penetrates through the shell, and two ends of the magnetic conduction shaft extend out of the shell; a plurality of pole shoes, the pole shoes are arranged in the shell cavity and are arranged at intervals in the axial direction, a magnetic source is arranged between the pole shoes in the axial direction, a first pole shoe in the plurality of pole shoes and the magnetic conductive shaft have a first gap in the radial direction, a plurality of first pole teeth are arranged on the part of the pole shoes, the first pole teeth have a first tooth width, a second pole shoe in the plurality of pole shoes and the magnetic conductive shaft have a second gap in the radial direction, a plurality of second pole teeth are arranged on the part of the pole shoes, the second pole teeth have a second tooth width, the first gap is larger than the second gap, the first tooth width is larger than the second tooth width, magnetic powder is arranged in the first gap, and magnetic liquid is arranged in the second gap; the magnetic source generates a magnetic field, the magnetic source is usually a permanent magnet or an electromagnet, the magnetic source is arranged between two adjacent pole shoes in the axial direction and is embedded on the pole shoes, and the polarity of the two adjacent magnetic sources is N S-S N or S N-N S in the axial direction; the magnetic conduction shaft, the pole shoe and the magnetic source form a closed magnetic loop, magnetic fields are distributed in the first gap and the second gap to form non-uniform magnetic fields with alternate strengths, the magnetic powder is adsorbed in the first gap between the first pole shoe and the magnetic conduction shaft under the action of the magnetic fields, and the magnetic liquid is adsorbed in the second gap between the second pole shoe and the magnetic conduction shaft under the action of the magnetic fields to form a magnetic powder sealing ring and a magnetic liquid sealing ring, so that the sealing effect is realized.
In some embodiments, the pole shoes 3 include at least one first pole shoe 31 and at least one second pole shoe 32, and at least two of the pole shoes 3 are arranged at intervals in the axial direction of the magnetically permeable shaft 2.
In some embodiments, the inner circumferential surface of the pole shoe is provided with a plurality of pole teeth, a plurality of first pole teeth are arranged at intervals along the axial direction on the inner circumferential surface of the first pole shoe, a plurality of second pole teeth are arranged at intervals along the axial direction on the inner circumferential surface of the second pole shoe, the pole tooth width of the first pole tooth is the first tooth width, the pole tooth width of the second pole tooth is the second tooth width, the first gap is formed between the plurality of first pole teeth of the plurality of first pole shoes and the magnetic conductive shaft, and the second gap is formed between the plurality of second pole teeth of the plurality of second pole shoes and the magnetic conductive shaft; the outer circular surfaces of the first pole shoe and the second pole shoe are provided with annular grooves, the annular grooves are used for placing sealing rings, and the outer circular surfaces of the first pole shoe and the second pole shoe are matched with the inner circular surface of the shell cavity.
In some embodiments, the magnetic powder and magnetic liquid combined sealing device comprises the magnetic source, the magnetic source generates a magnetic field, the magnetic source is usually a permanent magnet or an electromagnet, the magnetic source is arranged between two adjacent pole shoes in the axial direction and is embedded on the pole shoes, and the polarity of the two adjacent magnetic sources in the axial direction is N S-S N or S N-N S.
In some embodiments, the magnetic powder and magnetic liquid combined sealing device comprises the first bearing and the second bearing, the first bearing and the second bearing are mounted on the magnetic conductive shaft and are arranged in the shell cavity, the first bearing and the second bearing are arranged at two ends of the shell cavity at intervals in the shell cavity, or the first bearing and the second bearing are arranged at one end of the shell cavity adjacent to each other in the shell cavity.
In some embodiments, the magnetic powder and magnetic liquid combined sealing device includes a plurality of magnetism isolating rings, the first magnetism isolating ring is disposed between the first bearing and the pole shoe adjacent to the first bearing, the second magnetism isolating ring is disposed between the second bearing and the pole shoe adjacent to the second bearing, the pole shoes are axially disposed between the first magnetism isolating ring and the second magnetism isolating ring, outer circumferential surfaces of the first magnetism isolating ring and the second magnetism isolating ring are matched with an inner circumferential surface of the shell cavity, and inner circumferential surfaces of the first magnetism isolating ring and the second magnetism isolating ring are spaced from an outer circumferential surface of the magnetism conducting shaft.
In some embodiments, the magnetic powder and magnetic liquid combined sealing device includes a plurality of sealing rings, and the sealing rings are disposed in the annular grooves on the outer circumferential surfaces of the first pole piece and the second pole piece to seal a leakage channel formed between the outer circumferential surfaces of the first pole piece and the second pole piece and the inner circumferential surface of the shell cavity.
In some embodiments, the magnetic powder and magnetic liquid combined sealing device comprises the threaded end cover, and external threads of the threaded end cover are matched with internal threads at one end of the shell cavity and are compressed in the axial direction, so that the parts of the combined sealing device are axially fastened.
The invention has the beneficial effects that:
according to the magnetic powder and magnetic liquid combined sealing device, the magnetic powder sealing and the magnetic liquid sealing are ingeniously combined, so that the pressure resistance and the sealing performance of the sealing device are effectively improved, firstly, zero leakage is guaranteed, the pressure resistance is effectively improved, the leakage of a sealing medium is slow leakage after the zero leakage sealing fails, a large amount of buffer time of slow leakage can be provided, secondly, the magnetic powder sealing is arranged on two sides of the magnetic liquid sealing, the magnetic liquid sealing gap can be prevented from being polluted by dust and the like, and the service life and the reliability of the combined sealing device are improved; thirdly, the magnetic powder is arranged on two sides of the magnetic liquid seal in a sealing manner, so that the magnetic liquid and the external environment can be isolated, the evaporation rate of the magnetic liquid is reduced, and the service life and the reliability of the combined sealing device are improved; fourthly, after the magnetic liquid sealing ring is broken, the magnetic liquid can be flushed out of a sealing gap by a sealing medium, when the magnetic liquid is sputtered to the magnetic powder sealing ring, the magnetic liquid and the magnetic powder are mixed to form a new sealing ring, and the pressure-resistant effect is continuously exerted.
Drawings
Fig. 1 is a structural diagram of a magnetic powder and magnetic liquid combined sealing device according to the present invention.
Fig. 2 is a second diagram of the structure of a magnetic powder and magnetic liquid combined sealing device of the present invention.
Fig. 3 is a three-diagram of the structure of a magnetic powder and magnetic liquid combined sealing device of the invention.
Reference numerals:
a housing 1; a shell cavity 11; a flange 12;
a magnetic conductive shaft 2;
a pole shoe 3; a first pole piece 31; a second pole piece 32; a first pole tooth 33; the second pole teeth 34; magnetic powder 35; a magnetic liquid 36;
a magnetic source 4;
a first magnetism isolating ring 51; second magnetism isolating ring 52
A first bearing 6; a second bearing 7;
a seal ring 8;
a threaded end cap 9;
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. It should be noted that the embodiments described by referring to the drawings are exemplary and intended to be illustrative of the present invention, and should not be construed as limiting the present invention.
A magnetic powder and magnetic liquid combined sealing apparatus 100 according to an embodiment of the present invention is described below with reference to fig. 1 and 2.
A magnetic powder and magnetic liquid combined sealing device 100 according to an embodiment of the present invention includes: a housing 1 having a flange 12 and a housing cavity 11; the magnetic conduction shaft 2 penetrates through the shell 1, and two ends of the magnetic conduction shaft 2 extend out of the shell 1; a plurality of pole shoes 3, the pole shoes 3 being disposed in the shell cavity 11 and spaced apart in an axial direction, a magnetic source 4 being disposed between the pole shoes 3 and the pole shoes 3 in the axial direction, a first pole shoe 31 of the pole shoes 3 and the magnetically conductive shaft 2 having a first gap in a radial direction, and a portion of the first pole shoe 31 having a plurality of first pole teeth 33 thereon, the first pole teeth 33 having a first tooth width, a second pole shoe 32 of the pole shoes 3 and the magnetically conductive shaft 2 having a second gap in the radial direction, and a portion of the second pole shoe 32 having a plurality of second pole teeth 34 thereon, the second pole teeth 34 having a second tooth width, the first gap being larger than the second gap, the first tooth width being larger than the second tooth width, magnetic powder 35 being disposed in the first gap, and magnetic liquid 36 being disposed in the second gap; the magnetic source 4 generates a magnetic field, the magnetic source is usually a permanent magnet or an electromagnet, the magnetic source 4 is arranged between two adjacent pole shoes 3 in the axial direction and is embedded on the pole shoes 3, and the polarity arrangement of the two adjacent magnetic sources 4 in the axial direction is N S-S N or S N-N S; the magnetic conduction shaft 2, the pole shoe 3 and the magnetic source 4 form a closed magnetic loop, the magnetic field is distributed in a first gap and a second gap as non-uniform magnetic fields with alternate intensity, the magnetic powder 35 is adsorbed in the first gap between the first pole shoe 31 and the magnetic conduction shaft 2 under the action of the magnetic field, and the magnetic liquid 36 is adsorbed in the second gap between the second pole shoe 32 and the magnetic conduction shaft 2 under the action of the magnetic field to form a magnetic powder sealing ring and a magnetic liquid sealing ring, so that the sealing effect is realized.
It is worth mentioning that: the size of the first gap and the size of the second gap are not limited in the present invention, and the size of the first tooth width and the size of the second tooth width are not limited in the present invention, wherein the second gap may be selected according to a sealing gap of a general magnetic liquid seal, the first gap may be larger than the second gap, the second tooth width may be selected according to a tooth width of a general magnetic liquid seal, and the first tooth width may be larger than the second tooth width.
According to the magnetic powder and magnetic liquid combined sealing device 100 provided by the embodiment of the invention, the magnetic powder sealing and the magnetic liquid sealing are skillfully combined, so that the pressure resistance and the sealing performance of the sealing device are effectively improved, firstly, the magnetic liquid sealing part can keep zero leakage of sealing, the pressure resistance of the magnetic powder sealing part is effectively improved while the zero leakage is ensured, the leakage of a sealing medium is slow leakage after the zero leakage sealing of the magnetic liquid fails, a large amount of slow leakage buffering time can be provided, secondly, the magnetic powder sealing is arranged at two sides of the magnetic liquid sealing, the magnetic liquid sealing gap can be prevented from being polluted by dust and the like, and the service life and the reliability of the combined sealing device are improved; thirdly, the magnetic powder is arranged on two sides of the magnetic liquid seal in a sealing manner, so that the magnetic liquid 36 can be isolated from the external environment, the evaporation rate of the magnetic liquid 36 is reduced, and the service life and the reliability of the combined sealing device are improved; fourthly, after the magnetic liquid sealing ring is broken, the magnetic liquid 36 can be flushed out of a sealing gap by a sealing medium, when the magnetic liquid 36 is sputtered to the magnetic powder sealing ring, the magnetic liquid 36 and the magnetic powder 35 are mixed to form a new sealing ring, and the pressure-resistant effect is continuously exerted.
In some embodiments, the pole shoes 3 include at least one first pole shoe 31 and at least one second pole shoe 32, and at least two of the pole shoes 3 are arranged at intervals in the axial direction of the magnetically permeable shaft 2.
In some embodiments, the inner circumferential surface of the pole piece 3 is provided with a plurality of pole teeth, a plurality of first pole teeth 33 are arranged at intervals in the axial direction on the inner circumferential surface of the first pole piece 31, a plurality of second pole teeth 34 are arranged at intervals in the axial direction on the inner circumferential surface of the second pole piece 32, the pole tooth width of the first pole teeth 33 is the first tooth width, the pole tooth width of the second pole teeth 34 is the second tooth width, the first gap is formed between the plurality of first pole teeth 33 of the plurality of first pole pieces 31 and the magnetic conductive shaft 2, and the second gap is formed between the plurality of second pole teeth 34 of the plurality of second pole pieces 32 and the magnetic conductive shaft 2; the outer circular surfaces of the first pole piece 31 and the second pole piece 32 are provided with annular grooves for placing the sealing ring 8, and the outer circular surfaces of the first pole piece 31 and the second pole piece 32 are matched with the inner circular surface of the shell cavity 11.
It should be noted that the arrangement of the pole shoe 3 of the present invention is not limited to this, and for example: the first pole piece 31 and the second pole piece 32 are alternately arranged, or a plurality of first pole pieces 31 and a plurality of second pole pieces 32 are alternately arranged, and the like, the structural schematic diagrams are shown in fig. 2 and fig. 3, no one example is shown in this embodiment, and an operator can select the pole pieces according to actual needs.
In some embodiments, the magnetic powder and magnetic liquid combined sealing device 100 comprises the magnetic source 4, the magnetic source 4 generates a magnetic field, the magnetic source 4 is usually a permanent magnet or an electromagnet, the magnetic source 4 is arranged between two adjacent pole shoes 3 in the axial direction and is embedded on the pole shoes 3, and the polarity of the two adjacent magnetic sources 4 in the axial direction is N S-S N or S N-N S.
In some embodiments, the magnetic powder and magnetic liquid combined sealing device 100 includes the first bearing 6 and the second bearing 7, the first bearing 6 and the second bearing 7 are mounted on the magnetically permeable shaft 2 and are disposed in the shell cavity 11, the first bearing 6 and the second bearing 7 are axially spaced in the shell cavity 11 and disposed at two ends of the shell cavity 11, or the first bearing 6 and the second bearing 7 are axially adjacent in the shell cavity 11 and disposed at one end of the shell cavity 11.
Alternatively, the first bearing 6 and the second bearing 7 are rolling bearings.
In some embodiments, the magnetic powder and magnetic liquid combined sealing device 100 includes a plurality of magnetism isolating rings 5, the first magnetism isolating ring 51 is disposed between the first bearing 6 and the pole shoe 3 adjacent to the first bearing 6, the second magnetism isolating ring 52 is disposed between the second bearing 7 and the pole shoe 3 adjacent to the second bearing 7, the pole shoes 3 are axially disposed between the first magnetism isolating ring 51 and the second magnetism isolating ring 52, outer circumferential surfaces of the first magnetism isolating ring 51 and the second magnetism isolating ring 52 are matched with an inner circumferential surface of the shell cavity 11, and inner circumferential surfaces of the first magnetism isolating ring 51 and the second magnetism isolating ring 52 are spaced from an outer circumferential surface of the magnetism conducting shaft 2.
In some embodiments, the magnetic powder and magnetic liquid combined sealing device 100 includes a plurality of the sealing rings 8, which are disposed in the annular grooves on the outer circumferential surfaces of the first pole piece 31 and the second pole piece 32, and are used for sealing the leakage channel formed between the outer circumferential surfaces of the first pole piece 31 and the second pole piece 32 and the inner circumferential surface of the shell cavity 11.
In some embodiments, the magnetic powder and magnetic liquid combined sealing device 100 comprises the threaded end cover 9, and the external thread of the threaded end cover 9 is matched with the internal thread at one end of the shell cavity 11 and is compressed in the axial direction, so that the parts of the combined sealing device are axially fastened.
Claims (3)
1. A magnetic powder and magnetic liquid combined sealing device (100), comprising:
a housing (1), the housing (1) having a flange (12) and a housing cavity (11);
the magnetic conduction shaft (2) penetrates through the shell (1), and two ends of the magnetic conduction shaft (2) extend out of the shell (1);
a plurality of pole shoes (3), the pole shoes (3) are arranged in the shell cavity (11) at intervals in the axial direction, a magnetic source (4) is arranged between the pole shoes (3) and the axial direction of the pole shoes (3), a first pole shoe (31) in the pole shoes (3) and the magnetic conductive shaft (2) have a first gap in the radial direction, and a plurality of first pole teeth (33) are arranged on the part of the pole shoes (3), the first pole teeth (33) have a first tooth width, a second pole shoe (32) in the pole shoes (3) and the magnetic conductive shaft (2) have a second gap in the radial direction, and a plurality of second pole teeth (34) are arranged on the part of the pole shoes (3), the second pole teeth (34) have a second tooth width, the first gap is larger than the second gap, the first tooth width is larger than the second tooth width, and magnetic powder (35) is arranged in the first gap, a magnetic liquid (36) is arranged in the second gap;
the magnetic source (4) generates a magnetic field, the magnetic source (4) is a permanent magnet or an electromagnet, the magnetic source (4) is arranged between two adjacent pole shoes (3) in the axial direction and embedded on the pole shoes (3), and the polarities of the two adjacent magnetic sources (4) are N S-S N or S N-N S in the axial direction.
2. A magnetic powder and liquid combined sealing device (100) according to claim 1, wherein the pole pieces (3) comprise at least one first pole piece (31) and at least one second pole piece (32), at least two of the pole pieces (3) being arranged at a distance in the axial direction of the magnetically permeable shaft.
3. A magnetic powder and magnetic liquid combined sealing device (100) according to claim 1, wherein the first pole piece (31) provided with magnetic powder (35) is arranged on both sides of the second pole piece (32) provided with magnetic liquid (36), or the first pole piece (31) provided with magnetic powder (35) is arranged on the same side of the second pole piece (32) provided with magnetic liquid (36).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110372566.7A CN112963538A (en) | 2021-04-07 | 2021-04-07 | Magnetic powder and magnetic liquid combined sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110372566.7A CN112963538A (en) | 2021-04-07 | 2021-04-07 | Magnetic powder and magnetic liquid combined sealing device |
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| Publication Number | Publication Date |
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| CN112963538A true CN112963538A (en) | 2021-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110372566.7A Pending CN112963538A (en) | 2021-04-07 | 2021-04-07 | Magnetic powder and magnetic liquid combined sealing device |
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| CN (1) | CN112963538A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113833858A (en) * | 2021-11-02 | 2021-12-24 | 北京交通大学 | Magnetic powder sealing liquid device with fluid dynamic pressure reverse conveying function |
| CN114278734A (en) * | 2021-12-29 | 2022-04-05 | 清华大学 | Composite sealing device for magnetic conduction shaft |
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| SU1048214A1 (en) * | 1982-04-21 | 1983-10-15 | Предприятие П/Я Г-4213 | Magnetic liquid-packed seal |
| CN2660236Y (en) * | 2003-12-01 | 2004-12-01 | 北京交通大学 | Device of increasing magnetic liquid sealing pressure durable abilities of reciprocating shaft |
| CN108825790A (en) * | 2018-08-13 | 2018-11-16 | 广西科技大学 | A kind of magnetic source increment type magnetic fluid sealing structure |
| CN111963688A (en) * | 2020-08-12 | 2020-11-20 | 清华大学 | Multistage multipolar magnetic powder sealing device |
| CN112112973A (en) * | 2020-10-30 | 2020-12-22 | 清华大学 | Combined sealing device of magnetorheological fluid and magnetic liquid |
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2021
- 2021-04-07 CN CN202110372566.7A patent/CN112963538A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1048214A1 (en) * | 1982-04-21 | 1983-10-15 | Предприятие П/Я Г-4213 | Magnetic liquid-packed seal |
| CN2660236Y (en) * | 2003-12-01 | 2004-12-01 | 北京交通大学 | Device of increasing magnetic liquid sealing pressure durable abilities of reciprocating shaft |
| CN108825790A (en) * | 2018-08-13 | 2018-11-16 | 广西科技大学 | A kind of magnetic source increment type magnetic fluid sealing structure |
| CN111963688A (en) * | 2020-08-12 | 2020-11-20 | 清华大学 | Multistage multipolar magnetic powder sealing device |
| CN112112973A (en) * | 2020-10-30 | 2020-12-22 | 清华大学 | Combined sealing device of magnetorheological fluid and magnetic liquid |
Non-Patent Citations (1)
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113833858A (en) * | 2021-11-02 | 2021-12-24 | 北京交通大学 | Magnetic powder sealing liquid device with fluid dynamic pressure reverse conveying function |
| CN113833858B (en) * | 2021-11-02 | 2024-01-30 | 北京交通大学 | Magnetic powder sealing liquid device with fluid dynamic pressure feedback |
| CN114278734A (en) * | 2021-12-29 | 2022-04-05 | 清华大学 | Composite sealing device for magnetic conduction shaft |
| CN114278734B (en) * | 2021-12-29 | 2023-03-31 | 清华大学 | Composite sealing device for magnetic conduction shaft |
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Application publication date: 20210615 |