CN111173931A - Double-magnetic-source labyrinth type magnetic fluid sealing device - Google Patents
Double-magnetic-source labyrinth type magnetic fluid sealing device Download PDFInfo
- Publication number
- CN111173931A CN111173931A CN201911284389.6A CN201911284389A CN111173931A CN 111173931 A CN111173931 A CN 111173931A CN 201911284389 A CN201911284389 A CN 201911284389A CN 111173931 A CN111173931 A CN 111173931A
- Authority
- CN
- China
- Prior art keywords
- pole shoe
- magnetic fluid
- pole
- sealing
- shoe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
- F16J15/44—Free-space packings
- F16J15/447—Labyrinth packings
- F16J15/453—Labyrinth packings characterised by the use of particular materials
Landscapes
- 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 provides a double-magnetic-source labyrinth type magnetic fluid sealing device which comprises a shaft, a shell, a left bearing, a left magnetism isolating ring, a left pole shoe, a middle pole shoe, a right bearing, a right magnetism isolating ring, a right pole shoe and a permanent magnet, wherein the left pole shoe, the middle pole shoe and the right pole shoe are sequentially arranged on the shaft, and pole teeth are arranged in the radial direction of the left pole shoe and the right pole shoe; the middle pole shoe is provided with pole teeth in the radial direction and the axial direction; an inner pole shoe is arranged on the shaft; the inner pole shoe is arranged among the left pole shoe, the middle pole shoe and the right pole shoe; the inner pole shoe, the pole teeth on the left pole shoe and the right pole shoe form an axial sealing gap; the pole teeth on the inner pole shoe and the middle pole shoe form an axial sealing gap and a radial sealing gap simultaneously; magnetic fluid is injected into each sealing gap. The invention greatly reduces the loss of the magnetic fluid when the sealing fails, and improves the pressure resistance and the sealing reliability of the magnetic fluid sealing under the condition of large clearance.
Description
Technical Field
The invention relates to the technical field of mechanical engineering sealing, in particular to a double-magnetic-source labyrinth type magnetic fluid sealing device.
Background
The magnetic fluid seal is characterized in that the magnetic fluid is firmly fixed in the seal gap by utilizing the magnetic field force generated by the permanent magnet in the seal gap to resist the pressure difference at two sides, thereby achieving the sealing effect. When the magnetic fluid sealing technology is applied to a large-diameter, high-speed and heavy-load sealing environment, the magnetic fluid in the sealing gap often fails due to leakage of the magnetic fluid caused by the overlarge sealing gap, and therefore, the pressure resistance of the large-gap magnetic fluid seal needs to be improved. One of the methods for improving the pressure resistance of the magnetic fluid seal under the large gap is to provide a radial divergent type labyrinth magnetic fluid seal device in the chinese patent CN207634699 by improving the magnetic fluid seal structure, but the arrangement of the radial labyrinth structure of the structure depends on the shaft in the form of a stepped shaft, and the application range is small.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a double-magnetic-source labyrinth type magnetic fluid sealing device.
The invention adopts the following technical scheme:
a double-magnetic-source labyrinth type magnetic fluid sealing device comprises a shaft, a shell, a left bearing, a left magnetism isolating ring, a left pole shoe, a middle pole shoe, a right bearing, a right magnetism isolating ring, a right pole shoe and a permanent magnet, wherein the left pole shoe, the middle pole shoe and the right pole shoe are sequentially arranged on the shaft, and pole teeth are arranged in the radial direction of the left pole shoe and the right pole shoe; the middle pole shoe is provided with pole teeth in the radial direction and the axial direction; an inner pole shoe is arranged on the shaft; the inner pole shoe is arranged among the left pole shoe, the middle pole shoe and the right pole shoe; the inner pole shoe, the pole teeth on the left pole shoe and the right pole shoe form an axial sealing gap; the pole teeth on the inner pole shoe and the middle pole shoe form an axial sealing gap and a radial sealing gap simultaneously; magnetic fluid is injected into each sealing gap.
Further, the inner pole shoe is mounted on the shaft by a threaded connection.
Furthermore, the left sealing ring is arranged in a groove on the outer circular surface of the left pole shoe; the right sealing ring is arranged in a groove on the outer circular surface of the right pole shoe.
Preferably, the number of the pole teeth on the left pole shoe and the right pole shoe is 2-8 respectively.
Preferably, the number of the axial pole teeth on the middle pole shoe is 1-6, and the number of the radial pole teeth is 2-8.
Preferably, the size of the radial sealing gap and the axial sealing gap formed by each pole tooth and the pole shoe is 0.05-3 mm.
Preferably, the number of the permanent magnets is 2-5.
Further, the permanent magnet is of an axial magnetizing type.
The invention adopts a labyrinth type pole shoe structural design, pole teeth are designed in the radial direction of a left pole shoe and a right pole shoe and the radial direction and the axial direction of a middle pole shoe, and an inner pole shoe is additionally arranged, so that the left and the right pole shoes and the inner pole shoe form an axial sealing gap, the middle pole shoe and the inner pole shoe form an axial and radial sealing gap simultaneously, and magnetic fluid is injected into the gap to form a double-magnetic-source labyrinth type magnetic fluid sealing device; compared with the prior art, the invention can carry out labyrinth seal design without depending on the structure of a stepped shaft, also realizes the combination of the labyrinth seal and the magnetic fluid seal, greatly reduces the loss of the magnetic fluid when the seal fails, and improves the pressure resistance and the sealing reliability of the magnetic fluid seal under the condition of large clearance.
Drawings
FIG. 1 is a schematic structural view of a double-magnetic-source labyrinth type magnetic fluid sealing device of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples. In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and the like are used in the indicated orientations and positional relationships based on the orientation shown in the drawings for convenience in describing the invention and simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be considered as limiting.
As shown in fig. 1, the invention provides a double-magnetic-source labyrinth type magnetic fluid sealing device, which comprises a shaft 1, a shell 2, a left bearing 3 and a right bearing 4, wherein the shaft 1 penetrates through the shell 2; the left pole shoe 6, the middle pole shoe 8 and the right pole shoe 14 are sequentially arranged on the inner wall of the shell 2 from left to right, wherein the outer circular surfaces of the left pole shoe 6 and the right pole shoe 14 are provided with grooves, a left sealing ring 5 and a right sealing ring 13 are respectively arranged in the grooves, and the left bearing 3 and the right bearing 4 are arranged on a shaft outside the left pole shoe 6 and the right pole shoe 14; an inner pole shoe 15 connected through threads is arranged on the shaft 1, and the inner pole shoe 15 is arranged among the left pole shoe 6, the middle pole shoe 8 and the right pole shoe 14; pole teeth 16 are arranged in the radial direction of the left pole shoe 6 and the right pole shoe 14, and the pole teeth enable the left pole shoe 6, the right pole shoe 14 and the inner pole shoe 15 to form an axial sealing gap; the middle pole shoe 8 is also provided with pole teeth 16 in the radial and axial directions, and the pole teeth 16 enable the middle pole shoe 8 and the inner pole shoe 15 to form an axial sealing gap and a radial sealing gap simultaneously.
A left permanent magnet 6 is arranged between the left pole shoe 5 and the middle pole shoe 8, and a left magnetism isolating ring 4 is arranged between the left pole shoe 5 and the left bearing 3; similarly, a right permanent magnet 9 is arranged between the right pole shoe 14 and the middle pole shoe 8, and a right magnetism isolating ring 12 is arranged between the right pole shoe 14 and the right bearing 11; the sealing components are all installed in the shell 2, and the outer ring of the right bearing 11 is tightly pressed through the threaded connection of the end cover 10 and the shell 2.
In this embodiment, the number of the radial pole teeth on the left pole shoe 6 and the right pole shoe 14 is 2-8, the number of the axial pole teeth on the middle pole shoe 8 is 1-6, the number of the radial pole teeth on the middle pole shoe is 2-8, and the size of the radial sealing gap and the axial sealing gap formed by each pole tooth and the inner pole shoe 15 is 0.05-3 mm. In the embodiment, the number of the permanent magnets (namely the left permanent magnet 6 and the right permanent magnet 9) is 2-5, the permanent magnets are axially magnetized, and the directions of magnetic lines of force of adjacent permanent magnets are opposite.
In summary, the invention adopts a labyrinth type pole shoe structure design, pole teeth are designed in the radial direction of the left pole shoe and the right pole shoe, and the radial direction and the axial direction of the middle pole shoe, and the inner pole shoe is additionally arranged, so that the left pole shoe, the right pole shoe and the inner pole shoe form an axial sealing gap, the middle pole shoe and the inner pole shoe form an axial and radial sealing gap at the same time, and magnetic fluid is injected into the gap to form a double-magnetic source labyrinth type magnetic fluid sealing device; compared with the prior art, the invention does not need to rely on the structure of a stepped shaft to carry out labyrinth seal design, also realizes the combination of the labyrinth seal and the magnetic fluid seal, greatly reduces the loss of the magnetic fluid when the seal fails, and improves the pressure resistance and the sealing reliability of the magnetic fluid seal under the condition of large clearance.
Example 2
The difference between this embodiment and embodiment 1 is that the magnetic fluid sealing device in this embodiment is provided with a labyrinth structure formed by a plurality of left pole shoes 5, middle pole shoes 8, right pole shoes 14 and inner pole shoes 15 on the same shaft, that is, a multi-stage labyrinth magnetic fluid sealing device is formed.
It should be understood that the above examples are only for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. A double-magnetic-source labyrinth type magnetic fluid sealing device comprises a shaft, a shell, a left bearing, a left magnetism isolating ring, a left pole shoe, a middle pole shoe, a right bearing, a right magnetism isolating ring, a right pole shoe and a permanent magnet, wherein the left pole shoe, the middle pole shoe and the right pole shoe are sequentially arranged on the shaft; the middle pole shoe is provided with pole teeth in the radial direction and the axial direction; an inner pole shoe is arranged on the shaft; the inner pole shoe is arranged among the left pole shoe, the middle pole shoe and the right pole shoe; the inner pole shoe, the pole teeth on the left pole shoe and the right pole shoe form an axial sealing gap; the pole teeth on the inner pole shoe and the middle pole shoe form an axial sealing gap and a radial sealing gap simultaneously; magnetic fluid is injected into each sealing gap.
2. The magnetic fluid seal device according to claim 1 wherein the inner pole piece is mounted on the shaft by a threaded connection.
3. The magnetic fluid sealing device according to claim 1, wherein the left sealing ring is mounted in a groove on the outer circular surface of the left pole shoe; the right sealing ring is arranged in a groove on the outer circular surface of the right pole shoe.
4. The magnetic fluid sealing device according to claim 1, wherein the number of the pole teeth on the left pole shoe and the right pole shoe is 2-8 respectively.
5. The magnetic fluid seal device according to claim 1 wherein the number of axial teeth on the intermediate pole piece is 1-6 and the number of radial teeth is 2-8.
6. The magnetic fluid seal device according to claim 1 wherein the size of the radial and axial seal gaps formed by each tooth and pole piece is 0.05-3 mm.
7. The magnetic fluid seal device according to claim 1 wherein the number of permanent magnets is 2-5.
8. The magnetic fluid seal device according to claim 7 wherein the permanent magnet is of the axial magnetizing type.
9. The magnetic fluid seal device according to claim 8 wherein the magnetic lines of force between adjacent permanent magnets are in opposite directions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911284389.6A CN111173931A (en) | 2019-12-13 | 2019-12-13 | Double-magnetic-source labyrinth type magnetic fluid sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911284389.6A CN111173931A (en) | 2019-12-13 | 2019-12-13 | Double-magnetic-source labyrinth type magnetic fluid sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111173931A true CN111173931A (en) | 2020-05-19 |
Family
ID=70650106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911284389.6A Pending CN111173931A (en) | 2019-12-13 | 2019-12-13 | Double-magnetic-source labyrinth type magnetic fluid sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111173931A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114719022A (en) * | 2022-04-01 | 2022-07-08 | 中国矿业大学 | Split shaft diameter combined type magnetic liquid sealing device |
| CN114838134A (en) * | 2022-04-02 | 2022-08-02 | 清华大学 | Multi-pole tooth magnetic liquid sealing device |
-
2019
- 2019-12-13 CN CN201911284389.6A patent/CN111173931A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114719022A (en) * | 2022-04-01 | 2022-07-08 | 中国矿业大学 | Split shaft diameter combined type magnetic liquid sealing device |
| CN114719022B (en) * | 2022-04-01 | 2022-12-20 | 中国矿业大学 | Split shaft diameter combined type magnetic liquid sealing device |
| CN114838134A (en) * | 2022-04-02 | 2022-08-02 | 清华大学 | Multi-pole tooth magnetic liquid sealing device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108087561B (en) | Mixed type magnetic source magnetic fluid sealing device | |
| CN107882999B (en) | Magnetic source embedded magnetic fluid sealing device | |
| US10962119B2 (en) | Arc-shaped stepped magnetic fluid sealing device | |
| CN107906208B (en) | Convex arc type magnetic fluid sealing device | |
| CN107893853B (en) | Convex step shaft magnetic fluid sealing device | |
| CN108006230B (en) | Mixed type magnetic fluid sealing device | |
| CN107906207B (en) | Series-parallel magnetic fluid sealing device | |
| CN111173931A (en) | Double-magnetic-source labyrinth type magnetic fluid sealing device | |
| CN211423389U (en) | Double-magnetic-source labyrinth type magnetic fluid sealing device | |
| CN108980360B (en) | Magnetic source parallel type magnetic fluid sealing structure | |
| CN109764138B (en) | Embedded labyrinth type magnetic fluid sealing device | |
| CN104373601A (en) | Magnetic liquid sealing device with pole shoes being provided with high teeth and low teeth | |
| CN110906009A (en) | Series-parallel sleeve type magnetic fluid sealing device | |
| CN108374894B (en) | Embedded magnetic fluid sealing device | |
| CN211423388U (en) | Series-parallel sleeve type magnetic fluid sealing device | |
| CN106151526A (en) | A kind of split-type labyrinth type device for sealing magnetic fluid | |
| CN107956880B (en) | A kind of magnetic fluid sealing structure | |
| CN107830177B (en) | A kind of device for sealing magnetic fluid | |
| CN107740866B (en) | Stepped magnetic fluid sealing device | |
| CN109268507A (en) | A kind of more ring-like device for sealing magnetic fluid of magnetic source magnetic conduction | |
| CN112963538A (en) | Magnetic powder and magnetic liquid combined sealing device | |
| CN108266533A (en) | A kind of staggered magnetic fluid sealing structure | |
| CN202418592U (en) | Magnetic fluid seal device | |
| CN209762249U (en) | Embedded labyrinth type magnetic fluid sealing device | |
| CN108061163B (en) | A kind of staged device for sealing magnetic fluid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |