CN111442093A - Wide-temperature applicability magnetic liquid sealing device - Google Patents
Wide-temperature applicability magnetic liquid sealing device Download PDFInfo
- Publication number
- CN111442093A CN111442093A CN202010395854.XA CN202010395854A CN111442093A CN 111442093 A CN111442093 A CN 111442093A CN 202010395854 A CN202010395854 A CN 202010395854A CN 111442093 A CN111442093 A CN 111442093A
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- Prior art keywords
- magnetic liquid
- pole
- magnetic
- pole shoes
- teeth
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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
- F16J15/403—Sealings between relatively-moving surfaces by means of fluid by changing the state of matter
Abstract
A magnetic liquid sealing device with wide temperature applicability comprises a rotating shaft (11), a shell (12), a bearing part (13) and a magnetic liquid sealing part (14); the magnetic liquid A (1409 and 1411) is fluorocarbon-based or ester-based magnetic liquid, and the magnetic liquid B (1410) is kerosene-based or engine oil-based magnetic liquid; magnetic liquid A (1409) is injected at the pole tooth (1406) corresponding to the pole shoe (1403) adjacent to the sealed space, and magnetic liquid B (1410) is injected at least at one stage at the pole teeth (1407, 1408) corresponding to the rest pole shoes (1404, 1405). By adopting the structure, the magnetic liquid sealing device has low rotation torque under the low-temperature working condition and low evaporability under the high-temperature working condition. The sealing device effectively prevents the pollution of the magnetic liquid evaporation to the sealed space, reduces the evaporation loss of the magnetic liquid due to the reduction of the evaporation amount of the magnetic liquid to the outside, and indirectly prolongs the maintenance period and the service life of the magnetic liquid sealing device.
Description
Technical Field
The invention belongs to the technical field of mechanical engineering sealing, and is particularly suitable for sealing at the temperature of below-40 ℃ and above 60 ℃ in the fields of military industry, ships, navigation, aerospace and the like.
Background
The magnetic liquid is a novel functional material, and is a stable colloidal solution formed by uniformly dispersing nanoscale magnetic solid particles in a base carrier liquid. One of the most important applications of magnetic fluids is magnetic fluid sealing. The magnetic liquid seal has tight sealing performance, and the leakage rate of the magnetic liquid seal is almost difficult to measure; and because it is non-contact seal, so it has long service life, high reliability and can bear high rotating speed.
In practical use, certain special fields require magnetic fluids to operate over a wide temperature range from below-40 ℃ to above 60 ℃. Under the working condition of low temperature, especially below minus 40 ℃, the viscosity of the magnetic liquid is increased sharply, so that the rotating torque of the rotating shaft is too large, the requirement of precise control of equipment cannot be met, and even an electric drive system is destroyed. In order to solve the technical problem, for example, in a low-temperature large-diameter magnetic liquid sealing device disclosed in chinese patent specification CN1245583C, a magnetic liquid with good low-temperature fluidity, such as a kerosene-based magnetic liquid, is selected as a sealing medium. The technical scheme overcomes the defect of overlarge rotating torque under the low-temperature working condition, but under the high-temperature working condition, especially at the temperature of more than 60 ℃, because the magnetic liquid with good low-temperature fluidity usually has stronger evaporability, certain occasions with higher requirements on the evaporability can not be met.
Therefore, how to make the magnetic liquid sealing device have low rotation torque and low evaporation performance in a wide temperature range is a problem to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problem that the prior art cannot combine low rotation torque and low evaporation property within a wide temperature range. Therefore, the magnetic liquid sealing device with wide temperature applicability is provided, so that the magnetic liquid sealing device has low rotation torque under the low-temperature working condition and has low evaporability under the high-temperature working condition.
The technical scheme of the invention is as follows: according to the requirements of rotation torque and evaporability under the working condition of a wide temperature range, a magnetic liquid sealing structure is designed, and magnetic liquid with low viscosity and high evaporability and magnetic liquid with high viscosity and low evaporability are selected for combined sealing.
A wide temperature applicability magnetic liquid seal comprising: a rotating shaft, a housing, a bearing portion, and a magnetic liquid sealing portion. The shell is made of non-magnetic conductive materials, and a flange assembly is arranged on the shell and used for sealing the installation of the sealing device and sealing the installation connection position. An end cap is mounted to the end of the housing, preferably by a threaded or bolted connection to the housing. The bearing of the bearing part is arranged in the shell, and the rotating shaft is matched with the bearing part and penetrates through the shell along the axial direction of the shell. The magnetic liquid sealing part consists of a permanent magnet, a pole shoe, a pole tooth, magnetic liquid, a sealing ring and a magnetism isolating ring. The pole shoe, the pole teeth and the rotating shaft are made of magnetic conductive materials. The pole teeth are grooves with certain sizes, are arranged on the pole shoes or the rotating shaft, exist in gaps formed by the pole shoes and the rotating shaft and are used for forming magnetic field gradients, and the number of the pole teeth at each stage can be different. The permanent magnet is arranged between each stage of pole shoe to be used as a magnetic source, and the magnetic liquid is absorbed at the pole teeth to form a plurality of magnetic liquid rings. The permanent magnet, the pole shoe, the pole teeth, the rotating shaft and the magnetic liquid form a closed magnetic loop, and the magnetic liquid has pressure resistance under the action of magnetic field gradient, so that the sealing gap at the pole teeth is reliably sealed. The periphery of the pole shoe is provided with a groove, and the sealing ring is embedded in the groove to seal a leakage channel between the pole shoe and the shell. The magnetism isolating ring is made of non-magnetic conductive materials and matched with the pole shoe to prevent magnetic leakage of the magnetic circuit.
The invention uses two magnetic liquids with different physical parameters to carry out combined sealing. The magnetic liquid A is a magnetic liquid with higher viscosity under a low-temperature working condition and lower evaporability under a high-temperature working condition; the magnetic liquid B is a magnetic liquid with low viscosity under a low-temperature working condition and high evaporability under a high-temperature working condition. Preferably, the magnetic liquid A is fluorocarbon-based or ester-based magnetic liquid, and the magnetic liquid B is kerosene-based or engine oil-based magnetic liquid.
The number of pole shoe stages is more than two, preferably two or three. And when the stage number of the pole shoes is more than three, the magnetic liquid A is preferably injected at the pole teeth corresponding to the pole shoes adjacent to the open space. The magnetic liquid A at the pole teeth corresponding to the pole shoes adjacent to the sealed space prevents the magnetic liquid B from evaporating to the sealed space, and the magnetic liquid A at the pole teeth corresponding to the pole shoes adjacent to the open space prevents the magnetic liquid B from evaporating to the open space, so that the pollution of the magnetic liquid B to the sealed space and the open space is prevented. And because the evaporation capacity of the magnetic liquid to the outside is reduced, the evaporation loss of the magnetic liquid is reduced, and the maintenance period and the service life of the magnetic liquid sealing device are indirectly prolonged.
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is a structural sectional view of a first embodiment of the present invention;
FIG. 2 is a structural sectional view of a second embodiment of the present invention;
fig. 3 is a structural sectional view of a third embodiment of the present invention.
Detailed Description
In order to better understand the improvements of the present invention over the prior art, three specific embodiments of the present invention are described in detail below.
In a first embodiment of the present invention as shown in fig. 1, a wide temperature applicability magnetic liquid seal device 1 includes: a rotating shaft 11, a housing 12, a bearing portion 13, and a magnetic liquid seal portion 14. The housing 12 is made of a non-magnetic conductive material, and a flange assembly 121 is provided on the housing 12. An end cap 122 is mounted to the end of the housing 12, and the end cap 122 is threadably connected to the housing 12. Bearings 131 and 132 of bearing portion 13 are mounted in housing 12, and rotary shaft 11 is fitted to bearing portion 13 and penetrates housing 12 in the axial direction of housing 12. The magnetic liquid sealing part 14 is composed of a permanent magnet 1401, pole shoes 1403 and 1404, pole teeth 1406 and 1407, magnetic liquid A1409, magnetic liquid B1410, sealing rings 1412 and 1413 and magnetism isolating rings 1415 and 1416. The pole shoes 1403, 1404, the pole teeth 1406, 1407 and the shaft 11 are made of magnetically conductive material. The teeth 1406, 1407 are sized grooves that open into the pole pieces 1403, 1404. The permanent magnet 1401 is installed between the pole shoes 1403, 1404 as a magnetic source, and attracts the magnetic liquid 1409, 1410 to the pole teeth 1406, 1407 to form a plurality of magnetic liquid rings. The permanent magnet 1401, pole shoes 1403, 1404, pole teeth 1406, 1407, rotating shaft 11 and magnetic liquid 1409, 1410 form a closed magnetic loop. Grooves are formed in the peripheries of the pole shoes 1403 and 1404, and the sealing rings 1412 and 1413 are embedded in the grooves. The flux rings 1415, 1416 are made of a non-magnetic conductive material and cooperate with the pole pieces 1403, 1404.
Magnetic liquid A1409 is injected at the pole tooth 1406 corresponding to the pole shoe adjacent to the sealed space, and magnetic liquid B1410 is injected at the pole tooth 1407 corresponding to the pole shoe adjacent to the open space. The magnetic liquid A1409 at the pole tooth 1406 corresponding to the pole shoe adjacent to the sealed space blocks the magnetic liquid B1410 from evaporating to the sealed space, thereby preventing the sealed space from being polluted by the magnetic liquid B1410.
In a second embodiment of the present invention as shown in fig. 2, a wide temperature applicability magnetic liquid seal device 1 includes: a rotating shaft 11, a housing 12, a bearing portion 13, and a magnetic liquid seal portion 14. The housing 12 is made of a non-magnetic conductive material, and a flange assembly 121 is provided on the housing 12. An end cap 122 is mounted to the end of the housing 12, and the end cap 122 is threadably connected to the housing 12. Bearings 131 and 132 of bearing portion 13 are mounted in housing 12, and rotary shaft 11 is fitted to bearing portion 13 and penetrates housing 12 in the axial direction of housing 12. The magnetic liquid sealing part 14 is composed of a permanent magnet 1401, pole shoes 1403 and 1404, pole teeth 1406 and 1407, magnetic liquid A1409, magnetic liquid B1410, sealing rings 1412 and 1413 and magnetism isolating rings 1415 and 1416. The pole shoes 1403, 1404, the pole teeth 1406, 1407 and the shaft 11 are made of magnetically conductive material. The teeth 1406, 1407 are sized grooves that open onto the shaft 11 and correspond to the pole shoes 1403, 1404. The permanent magnet 1401 is installed between the pole shoes 1403, 1404 as a magnetic source, and attracts the magnetic liquid 1409, 1410 to the pole teeth 1406, 1407 to form a plurality of magnetic liquid rings. The permanent magnet 1401, pole shoes 1403, 1404, pole teeth 1406, 1407, rotating shaft 11 and magnetic liquid 1409, 1410 form a closed magnetic loop. Grooves are formed in the peripheries of the pole shoes 1403 and 1404, and the sealing rings 1412 and 1413 are embedded in the grooves. The flux rings 1415, 1416 are made of a non-magnetic conductive material and cooperate with the pole pieces 1403, 1404.
Magnetic liquid A1409 is injected at the pole tooth 1406 corresponding to the pole shoe adjacent to the sealed space, and magnetic liquid B1410 is injected at the pole tooth 1407 corresponding to the pole shoe adjacent to the open space. The magnetic liquid A1409 at the pole tooth 1406 corresponding to the pole shoe adjacent to the sealed space blocks the magnetic liquid B1410 from evaporating to the sealed space, thereby preventing the sealed space from being polluted by the magnetic liquid B1410.
In a third embodiment of the present invention as shown in fig. 3, a wide temperature applicability magnetic liquid seal device 1 includes: a rotating shaft 11, a housing 12, a bearing portion 13, and a magnetic liquid seal portion 14. The housing 12 is made of a non-magnetic conductive material, and a flange assembly 121 is provided on the housing 12. An end cap 122 is mounted to the end of the housing 12, and the end cap 122 is threadably connected to the housing 12. Bearings 131 and 132 of bearing portion 13 are mounted in housing 12, and rotary shaft 11 is fitted to bearing portion 13 and penetrates housing 12 in the axial direction of housing 12. The magnetic liquid sealing part 14 is composed of permanent magnets 1401 and 1402, pole shoes 1403 to 1405, pole teeth 1406 to 1408, magnetic liquids A1409 and 1411, magnetic liquid B1410, sealing rings 1412 to 1414 and magnetism isolating rings 1415 and 1416. Pole shoes 1403-1405, pole teeth 1406-1408 and rotating shaft 11 are made of magnetic conductive materials. The pole teeth 1406 to 1408 are grooves of a certain size and are formed on the pole shoes 1403 to 1405. Permanent magnets 1401 and 1402 are used as magnetic sources and are respectively arranged between pole shoes 1403 and 1404 and between pole shoes 1404 and 1405, and magnetic liquid 1409-1411 is adsorbed at pole teeth 1406-1408 to form a plurality of magnetic liquid rings. Permanent magnets 1401 and 1402, pole shoes 1403 to 1405, pole teeth 1406 to 1408, a rotating shaft 11 and magnetic liquids 1409 to 1411 form a closed magnetic loop. Grooves are formed in the peripheries of the pole shoes 1403 to 1405, and the sealing rings 1412 to 1414 are embedded in the grooves. The flux rings 1415, 1416 are made of a non-magnetic conductive material and cooperate with the pole pieces 1403, 1405.
Magnetic liquid A1409 is injected at the pole tooth 1406 corresponding to the pole shoe adjacent to the sealed space, magnetic liquid A1411 is injected at the pole tooth 1408 corresponding to the pole shoe adjacent to the open space, and magnetic liquid B1410 is injected at the middle pole tooth 1407. The magnetic liquid A1409 at the pole tooth 1406 corresponding to the pole shoe adjacent to the sealed space blocks the magnetic liquid B1410 from evaporating to the sealed space, and the magnetic liquid A1411 at the pole tooth 1408 corresponding to the pole shoe adjacent to the open space blocks the magnetic liquid B1410 from evaporating to the open space, so that the sealed space and the open space are prevented from being polluted by the magnetic liquid B1410.
Claims (5)
1. A magnetic liquid sealing device with wide temperature applicability comprises
-a shaft (11), a housing (12), a bearing portion (13), a magnetic liquid seal (14);
-the housing (12) is made of a non-magnetic conductive material, the housing (12) is provided with a flange assembly (121), and an end cap (122) is mounted at the end of the housing (12);
-the bearings (131, 132) of the bearing portion (13) are mounted in the casing (12), the rotary shaft (11) being fitted with the bearing portion (13) and penetrating the casing (12) axially along the casing (12);
the magnetic liquid sealing part (14) consists of permanent magnets (1401, 1402), pole shoes (1403-1405), pole teeth (1406-1408), magnetic liquid A (1409, 1411), magnetic liquid B (1410), sealing rings (1412-1414) and magnetism isolating rings (1415, 1416);
pole shoes (1403-1405), pole teeth (1406-1408), the rotating shaft (11) is made of a magnetic conductive material;
the pole teeth (1406-1408) are grooves with certain sizes, are arranged on the pole shoes (1403-1405) or the rotating shaft (11), and exist in gaps formed between the pole shoes (1403-1405) and the rotating shaft (11);
permanent magnets (1401, 1402) as magnetic sources are installed between the pole shoes (1403-1405), and magnetic liquid (1409-1411) is adsorbed at the pole teeth (1406-1408) to form a plurality of magnetic liquid rings;
-permanent magnets (1401, 1402), pole shoes (1403-1405), pole teeth (1406-1408), a rotating shaft (11) and magnetic liquid (1409-1411) form a closed magnetic loop;
the number of stages of the pole shoes (1403-1405) is more than two, grooves are formed in the peripheries of the pole shoes (1403-1405), and the sealing rings (1412-1414) are embedded in the grooves;
-the magnetism isolating rings (1415, 1416) are made of non-magnetic conductive material and are matched with the pole shoes (1403-1405);
the method is characterized in that:
-magnetic liquid a (1409, 1411) is a fluorocarbon-based or ester-based magnetic liquid, and magnetic liquid B (1410) is a kerosene-based or oil-based magnetic liquid;
-magnetic liquid a (1409) is injected at the pole teeth (1406) corresponding to the pole shoe (1403) adjacent to the sealed space, and magnetic liquid B (1410) is injected at least one stage at the pole teeth (1407, 1408) corresponding to the remaining pole shoes (1404, 1405).
2. The wide temperature applicability magnetic liquid seal arrangement of claim 1, wherein: the pole shoe (1403, 1404) number is two.
3. The wide temperature applicability magnetic liquid seal arrangement of claim 1, wherein: the pole shoes (1403-1405) are three-stage, and magnetic liquid A (1411) is injected into the pole teeth (1408) corresponding to the pole shoes (1405) adjacent to the open space.
4. A wide temperature applicability magnetic liquid seal apparatus as claimed in any one of claims 1-3, wherein: the number of teeth of each stage (1406-1408) can be different.
5. The wide temperature applicability magnetic liquid seal arrangement of claim 4, wherein: the end cover (122) is connected with the shell (12) through threads or bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010395854.XA CN111442093A (en) | 2020-05-12 | 2020-05-12 | Wide-temperature applicability magnetic liquid sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010395854.XA CN111442093A (en) | 2020-05-12 | 2020-05-12 | Wide-temperature applicability magnetic liquid sealing device |
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| CN111442093A true CN111442093A (en) | 2020-07-24 |
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| CN202010395854.XA Pending CN111442093A (en) | 2020-05-12 | 2020-05-12 | Wide-temperature applicability magnetic liquid sealing device |
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| CN112049938A (en) * | 2020-09-08 | 2020-12-08 | 清华大学 | Capillary magnetic liquid sealing device |
| CN112112971A (en) * | 2020-10-30 | 2020-12-22 | 清华大学 | Floating ring type magnetic liquid sealing device |
| CN112112972A (en) * | 2020-10-30 | 2020-12-22 | 清华大学 | Magnetic liquid reciprocating sealing device |
| CN112112973A (en) * | 2020-10-30 | 2020-12-22 | 清华大学 | Combined sealing device of magnetorheological fluid and magnetic liquid |
| CN112360986A (en) * | 2020-10-30 | 2021-02-12 | 清华大学 | Magnetic liquid sealing device of frameless direct-drive motor and equipment with magnetic liquid sealing device |
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| CN113109202A (en) * | 2021-03-25 | 2021-07-13 | 北京交通大学 | Device and method for measuring magnetic liquid evaporation capacity under magnetic field temperature field coupling effect |
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| CN112049938A (en) * | 2020-09-08 | 2020-12-08 | 清华大学 | Capillary magnetic liquid sealing device |
| US11300211B2 (en) | 2020-09-08 | 2022-04-12 | Tsinghua University | Capillary magnetic-liquid sealing device |
| CN112112971A (en) * | 2020-10-30 | 2020-12-22 | 清华大学 | Floating ring type magnetic liquid sealing device |
| CN112112972A (en) * | 2020-10-30 | 2020-12-22 | 清华大学 | Magnetic liquid reciprocating sealing device |
| CN112112973A (en) * | 2020-10-30 | 2020-12-22 | 清华大学 | Combined sealing device of magnetorheological fluid and magnetic liquid |
| CN112360986A (en) * | 2020-10-30 | 2021-02-12 | 清华大学 | Magnetic liquid sealing device of frameless direct-drive motor and equipment with magnetic liquid sealing device |
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| CN112112973B (en) * | 2020-10-30 | 2021-06-04 | 清华大学 | Combined sealing device of magnetorheological fluid and magnetic liquid |
| CN112392963A (en) * | 2020-11-11 | 2021-02-23 | 清华大学 | Magnetic liquid sealing device |
| CN112392963B (en) * | 2020-11-11 | 2021-07-20 | 清华大学 | Magnetic liquid sealing device |
| CN112431927B (en) * | 2020-11-25 | 2021-11-16 | 清华大学 | Magnetic liquid sealing device |
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| CN112431927A (en) * | 2020-11-25 | 2021-03-02 | 清华大学 | Magnetic liquid sealing device |
| CN112431928B (en) * | 2020-11-25 | 2022-09-23 | 清华大学 | Magnetic liquid sealing device |
| CN112503181A (en) * | 2020-12-18 | 2021-03-16 | 清华大学 | Slant magnetization's magnetic liquid seal structure |
| CN112728102A (en) * | 2020-12-29 | 2021-04-30 | 清华大学 | Magnetic liquid sealing device |
| CN112963544A (en) * | 2021-03-17 | 2021-06-15 | 清华大学 | Magnetic liquid sealing device with porous medium material layer |
| CN113109202A (en) * | 2021-03-25 | 2021-07-13 | 北京交通大学 | Device and method for measuring magnetic liquid evaporation capacity under magnetic field temperature field coupling effect |
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