CN202332310U - Shielded magnetic fluid sealing device - Google Patents
Shielded magnetic fluid sealing device Download PDFInfo
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- CN202332310U CN202332310U CN2011204437141U CN201120443714U CN202332310U CN 202332310 U CN202332310 U CN 202332310U CN 2011204437141 U CN2011204437141 U CN 2011204437141U CN 201120443714 U CN201120443714 U CN 201120443714U CN 202332310 U CN202332310 U CN 202332310U
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- rotating shaft
- bearing
- sealing
- magnetic
- magnetic fluid
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Abstract
The utility model discloses a shielded magnetic fluid sealing device, which comprises a rotating shaft made from a non-magnetically conductive material, a sealing pair with a rotating shaft mounting hole, a first bearing, a second bearing, a magnetically conductive sleeve and a shell with an inner hole, wherein the first bearing, the sealing pair and the second bearing are sequentially arranged in the inner hole of the shell; the two ends of the rotating shaft are adapted to the first and second bearings respectively; the magnetically conductive sleeve is arranged on the outer circle of the rotating shaft and between the first and second bearings; and the rotating shaft with the magnetically conductive sleeve is arranged in the rotating shaft mounting hole of the sealing pair. The magnetically conductive sleeve is arranged between the rotating shaft and the sealing pair, so that influence caused by the rotating shaft between magnetic fields inside and outside the sealing device is avoided. Therefore, the shielded magnetic fluid sealing device has the advantage of resistance to magnetic interference, and the escape of the internal magnetic field or the entering of the external magnetic field can be avoided.
Description
Technical field
The utility model relates to the Magneticfluid Seal Technique field, in particular, relates to a kind of protected type device for sealing magnetic fluid.
Background technology
The application of magnetic fluid technique on field of sealing technology is one of its most important achievement; Development through decades; Magnet fluid sealing has obtained widespread use in various fields such as national defence, space flight, machinery, electronics, instrument, atomic energy, chemical industry, pharmacy, and particularly performance is very outstanding aspect three of dust seal, vacuum seal and pressure reduction sealings.Like the sealing at important mechanical rotation position, especially the dynamic leakage preventive portion as equipment has outstanding superiority in rotating shaft.Both can reach the leakproof purpose, but the motion of unlikely again influence movable property spare.So the range of application of Magneticfluid Seal Technique is more and more wider.
See also shown in Figure 1ly, at present typical magnetic fluid dynamic sealing device is generally by a permanent magnet 6 (annulus or cylindrical), two magnetic poles 7 (ring-type disc-shaped permeability magnetic material), rotating shaft 1 (cylindrical permeability magnetic material) and magnetic fluid 8 formation seal assemblies; This seal assembly is installed in the housing 3 (non-magnet material), magnetic shield 5 during installation (ring-type disc-shaped non-magnet material) is used for avoiding bearing to be magnetized in isolated magnetic field again; Bearing 4 is used for guaranteeing rotating shaft 1 rotation, and guarantees the unanimity of seal clearance " δ " shown in the figure; Static seal O RunddichtringO 2 is used for guaranteeing leakage from here of gas; 9 pairs of above-mentioned parts of bearing cap carry out axial location, prevent that above-mentioned part from moving.Since in this device the N-S utmost point of permanent magnet 6 be by axial distribution and two magnetic poles 7 and rotating shaft 1 process by permeability magnetic material; Therefore; Under the action of a magnetic field, shown in the figure Middle Ring Line, formed the magnetic circuit of sealing one by one, this closed magnetic path forms along the interval rotating shaft of N-S surface.From figure, it can also be seen that between two magnetic poles and the rotating shaft it is that gapped " δ " exists; This cross section cylindrical of this gap twisted rotary shaft shape ringwise distributes; These two sections annular gaps are exactly " air gap " in our the usually said magnetic field magnetic circuit, and the magnetic field intensity in the magnetic air gap of magnetic field is maximum.Magnet fluid sealing has utilized this magnetic phenomenon just; The magnetic fluid 8 that will have ultra paramagnetic characteristic injects therebetween; Under the action of a magnetic field; Magnetic fluid is steadily adsorbed and is full of this two intersegmental crack between rotating shaft (movement parts) and the magnetic pole (static element), has realized the separation to magnetic field two end spaceses, and forms sealing reliably.
Rotating shaft of the prior art adopts permeability magnetic material to make usually, forming magnetic loop in body interior, and requires around device for sealing magnetic fluid, can not have magnetic field.If around device for sealing magnetic fluid, have the device that produces magnetic field, then the inner magnetic field of device for sealing magnetic fluid can influence each other with the magnetic field of outside.So not only outside magnetic field can reduce the sealing property of device for sealing magnetic fluid, and outside device operate as normal can be disturbed in inner magnetic field.In practical application, this situation is inevitable basically.For example, according to the requirement at scene, need situation such as magnetic-inductive device be installed in the rotating shaft of device for sealing magnetic fluid.If this moment, the rotating shaft of device for sealing magnetic fluid still adopted permeability magnetic material to make, will cause magnetic field to leak influences the sensitivity of magnetic-inductive device, and perhaps the external magnetic field is imported the sealing property that influences magnetic fluid seal in the magnetic fluid seal into through the magnetic conduction rotating shaft.
Therefore, how to make a kind of device for sealing magnetic fluid that to avoid magnetic interference that has, become the problem that needs most solution at present.
The utility model content
In view of this, the purpose of design of the utility model is, a kind of protected type device for sealing magnetic fluid that can avoid magnetic interference that has is provided.
The utility model embodiment is achieved in that
A kind of protected type device for sealing magnetic fluid comprises that rotating shaft, the set inside of being made by non-magnet_conductible material have sealing pair, clutch shaft bearing, second bearing, flux sleeve and the set inside of rotating shaft mounting hole that the housing of endoporus is arranged;
Said clutch shaft bearing, said sealing pair and second bearing are successively set in the endoporus of said housing;
The two ends of said rotating shaft are suitable with the said clutch shaft bearing and second bearing respectively, are provided with said flux sleeve on the cylindrical of said rotating shaft and between the said clutch shaft bearing and second bearing;
The rotating shaft that said flux sleeve is housed is arranged in the rotating shaft mounting hole of said sealing pair.
Preferably, in above-mentioned protected type device for sealing magnetic fluid, the arranged outside that is positioned at said clutch shaft bearing in the said rotating shaft has the snap ring of fixing said clutch shaft bearing.
Preferably, in above-mentioned protected type device for sealing magnetic fluid, the arranged outside that is positioned at said second bearing in the said rotating shaft has the end cap of fixing said second bearing.
Preferably, in above-mentioned protected type device for sealing magnetic fluid, said sealing pair comprises:
Permanent magnet;
Be arranged on the magnetic pole at said permanent magnet two ends;
Be arranged on the magnetic fluid between said two magnetic poles and the said flux sleeve.
Preferably, in above-mentioned protected type device for sealing magnetic fluid, also comprise:
Be arranged in the endoporus of said housing and place magnetic shield between said clutch shaft bearing and the sealing pair.
Preferably, in above-mentioned protected type device for sealing magnetic fluid, also comprise:
Be arranged in the endoporus of said housing and place magnetic shield between said second bearing and the sealing pair.
Preferably, in above-mentioned protected type device for sealing magnetic fluid, be provided with O-ring seal between the magnetic pole of said sealing pair and the said housing.
Preferably, in above-mentioned protected type device for sealing magnetic fluid, be provided with O-ring seal between said rotating shaft and the said flux sleeve.
Compared with prior art, the technical scheme that provides of the utility model embodiment has the following advantages and characteristics:
The protected type device for sealing magnetic fluid that the utility model provides is through being provided with a flux sleeve, so that inner with the outside magnetic field of packoff can not influence each other because of rotating shaft between rotating shaft and sealing pair.Because the rotating shaft by non-magnet_conductible material is made can not transmitted magnetic field; And the flux sleeve that is arranged in the rotating shaft can satisfy the inner demand that forms magnetic field of packoff; Therefore, the utlity model has the advantage of diamagnetic interference, thereby can avoid leaking of internal magnetic field or importing into of external magnetic field.
Description of drawings
In order to be illustrated more clearly in the utility model or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the sectional view of existing device for sealing magnetic fluid;
Fig. 2 is the sectional view of the protected type device for sealing magnetic fluid that the utility model provided;
Fig. 3 is the sectional view of the rotating shaft that the utility model provided.
Embodiment
To combine the accompanying drawing among the utility model embodiment below, the technical scheme among the utility model embodiment is carried out clear, intactly description, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
The utility model embodiment provides a kind of protected type device for sealing magnetic fluid, comprises that rotating shaft, the set inside of being made by non-magnet_conductible material have sealing pair, clutch shaft bearing, second bearing, flux sleeve and the set inside of rotating shaft mounting hole that the housing of endoporus is arranged; Said clutch shaft bearing, said sealing pair and second bearing are successively set in the endoporus of said housing; The two ends of said rotating shaft are suitable with the said clutch shaft bearing and second bearing respectively, are provided with said flux sleeve on the cylindrical of said rotating shaft and between the said clutch shaft bearing and second bearing; The rotating shaft that said flux sleeve is housed is arranged in the rotating shaft mounting hole of said sealing pair.Because there is multiple mode in the concrete realization of above-mentioned protected type device for sealing magnetic fluid, is elaborated through specific embodiment below:
See also Fig. 2 and shown in Figure 3, shown in Figure 2 is a kind of protected type device for sealing magnetic fluid, and shown in Figure 3 is the rotating shaft of sealing device.Wherein, packoff shown in Figure 2 comprises that rotating shaft 28, the set inside of being made by non-magnet_conductible material have sealing pair 27, clutch shaft bearing 22, second bearing 29, flux sleeve 26 and the set inside of rotating shaft mounting hole that the housing 23 of endoporus is arranged; Said clutch shaft bearing 22, said sealing pair 27 and second bearing 29 are successively set in the endoporus of said housing 23; The two ends of said rotating shaft 28 are suitable with the said clutch shaft bearing 22 and second bearing 29 respectively, are provided with said flux sleeve 26 on the cylindrical of said rotating shaft 28 and between the said clutch shaft bearing 22 and second bearing 29; The rotating shaft 28 that said flux sleeve 26 is housed is arranged in the rotating shaft mounting hole of said sealing pair 27.
In Fig. 2 and embodiment shown in Figure 3, the protected type device for sealing magnetic fluid that the utility model provides is through being provided with a flux sleeve 26, so that inner with the outside magnetic field of packoff can not influence each other because of rotating shaft 28 between rotating shaft 28 and sealing pair 27.Because the rotating shaft 28 by non-magnet_conductible material is made can not transmitted magnetic field; And the flux sleeve 26 that is arranged in the rotating shaft 28 can satisfy the inner demand that forms magnetic field of packoff; Therefore; The utlity model has the advantage of diamagnetic interference, thereby can avoid leaking of internal magnetic field or importing into of external magnetic field.
In Fig. 2 and embodiment shown in Figure 3; Axial float for fear of the clutch shaft bearing 22 and second bearing 29; The arranged outside that in said rotating shaft 28, is positioned at said clutch shaft bearing 22 is used for fixing the snap ring 21 of said clutch shaft bearing 22, and the arranged outside that is positioned at said second bearing 29 in the said rotating shaft 28 has the end cap 210 of fixing said second bearing 29.Wherein, said sealing pair 27 comprises: permanent magnet; Be arranged on the magnetic pole at said permanent magnet two ends; Be arranged on the magnetic fluid between said two magnetic poles and the said flux sleeve 26.
In Fig. 2 and embodiment shown in Figure 3; In order to guarantee the sealing effectiveness of packoff; The sealing device can also comprise magnetic shield 24; Wherein, magnetic shield 24 is arranged in the endoporus of said housing 23 and places between said clutch shaft bearing 22 and the sealing pair 27, and another magnetic shield 24 is arranged in the endoporus of said housing 23 and places between said second bearing 29 and the sealing pair 27.In addition, can also between the magnetic pole of said sealing pair 27 and said housing 23, O-ring seal 25 be set, between said rotating shaft 23 and said flux sleeve 26, O-ring seal 25 be set.Quantity about above-mentioned magnetic shield 24 and O-ring seal 25 is decided by the concrete condition of packoff, is not limited to the above-mentioned embodiment that provides at this.
Need to prove that Fig. 2 and embodiment shown in Figure 3 are the preferred embodiment that the utility model is introduced, those skilled in the art can design more embodiment on this basis fully, therefore do not give unnecessary details herein.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation of spirit that does not break away from the utility model or scope in other embodiments among this paper.Therefore, the utility model will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (8)
1. a protected type device for sealing magnetic fluid is characterized in that, comprises that rotating shaft, the set inside of being made by non-magnet_conductible material have sealing pair, clutch shaft bearing, second bearing, flux sleeve and the set inside of rotating shaft mounting hole that the housing of endoporus is arranged;
Said clutch shaft bearing, said sealing pair and second bearing are successively set in the endoporus of said housing;
The two ends of said rotating shaft are suitable with the said clutch shaft bearing and second bearing respectively, are provided with said flux sleeve on the cylindrical of said rotating shaft and between the said clutch shaft bearing and second bearing;
The rotating shaft that said flux sleeve is housed is arranged in the rotating shaft mounting hole of said sealing pair.
2. protected type device for sealing magnetic fluid according to claim 1 is characterized in that, the arranged outside that is positioned at said clutch shaft bearing in the said rotating shaft has the snap ring of fixing said clutch shaft bearing.
3. protected type device for sealing magnetic fluid according to claim 1 is characterized in that, the arranged outside that is positioned at said second bearing in the said rotating shaft has the end cap of fixing said second bearing.
4. protected type device for sealing magnetic fluid according to claim 1 is characterized in that, said sealing pair comprises:
Permanent magnet;
Be arranged on the magnetic pole at said permanent magnet two ends;
Be arranged on the magnetic fluid between said two magnetic poles and the said flux sleeve.
5. protected type device for sealing magnetic fluid according to claim 1 is characterized in that, also comprises:
Be arranged in the endoporus of said housing and place magnetic shield between said clutch shaft bearing and the sealing pair.
6. protected type device for sealing magnetic fluid according to claim 1 is characterized in that, also comprises:
Be arranged in the endoporus of said housing and place magnetic shield between said second bearing and the sealing pair.
7. protected type device for sealing magnetic fluid according to claim 1 is characterized in that, is provided with O-ring seal between the magnetic pole of said sealing pair and the said housing.
8. protected type device for sealing magnetic fluid according to claim 1 is characterized in that, is provided with O-ring seal between said rotating shaft and the said flux sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204437141U CN202332310U (en) | 2011-11-10 | 2011-11-10 | Shielded magnetic fluid sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204437141U CN202332310U (en) | 2011-11-10 | 2011-11-10 | Shielded magnetic fluid sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202332310U true CN202332310U (en) | 2012-07-11 |
Family
ID=46444282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204437141U Expired - Lifetime CN202332310U (en) | 2011-11-10 | 2011-11-10 | Shielded magnetic fluid sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202332310U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107893855A (en) * | 2017-12-13 | 2018-04-10 | 广西科技大学 | A kind of recessed multi-diameter shaft device for sealing magnetic fluid |
| CN107917192A (en) * | 2017-12-13 | 2018-04-17 | 广西科技大学 | A kind of multilevel sleeve type device for sealing magnetic fluid |
| CN107956882A (en) * | 2017-12-13 | 2018-04-24 | 广西科技大学 | A kind of multistage disk device for sealing magnetic fluid |
-
2011
- 2011-11-10 CN CN2011204437141U patent/CN202332310U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107893855A (en) * | 2017-12-13 | 2018-04-10 | 广西科技大学 | A kind of recessed multi-diameter shaft device for sealing magnetic fluid |
| CN107917192A (en) * | 2017-12-13 | 2018-04-17 | 广西科技大学 | A kind of multilevel sleeve type device for sealing magnetic fluid |
| CN107956882A (en) * | 2017-12-13 | 2018-04-24 | 广西科技大学 | A kind of multistage disk device for sealing magnetic fluid |
| CN107893855B (en) * | 2017-12-13 | 2023-05-02 | 广西科技大学 | Concave stepped shaft magnetic fluid sealing device |
| CN107917192B (en) * | 2017-12-13 | 2023-05-05 | 广西科技大学 | Multistage sleeve type magnetic fluid sealing device |
| CN107956882B (en) * | 2017-12-13 | 2023-05-05 | 广西科技大学 | Multistage disc magnetic fluid sealing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120711 |
|
| CX01 | Expiry of patent term |