CN113074253A - Long-life light magnetohydrodynamic sealing device - Google Patents
Long-life light magnetohydrodynamic sealing device Download PDFInfo
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- CN113074253A CN113074253A CN202110333014.5A CN202110333014A CN113074253A CN 113074253 A CN113074253 A CN 113074253A CN 202110333014 A CN202110333014 A CN 202110333014A CN 113074253 A CN113074253 A CN 113074253A
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- rotating shaft
- magnetic
- pole shoe
- sealing device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
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- Mechanical Engineering (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The invention discloses a magnetic fluid dynamic sealing device with long service life and light weight. The permanent magnet motor comprises a shell, a rotating shaft, permanent magnets and pole shoes, wherein the pole shoes are arranged on two sides of the permanent magnets on the inner wall of the shell; the outer circumference of the pole shoe is hermetically connected with the inner wall of the shell, a gap is formed between the inner circumference of the pole shoe and the outer surface of the rotating shaft, and magnetic fluid is filled in the gap; the rotating shaft is made of titanium alloy materials, so that the whole weight of the device is reduced, and the outer surface of the rotating shaft and the inner surface of the pole shoe are provided with wear-resistant magnetic conductive coatings. Through the wear-resistant magnetic conductive coating on the surfaces of the rotating shaft and the pole shoe, the device can form a high-density magnetic induction line loop, stably and reliably limit the magnetic fluid at the gap between the rotating shaft and the pole shoe, and enhance the sealing performance of the whole device; the wear-resistant magnetic conductive coating can reduce the energy loss during working to the maximum extent, avoid the surface abrasion of the pole shoe and the rotating shaft when the device rotates at a high speed, and improve the structural reliability and the service life.
Description
Technical Field
The invention belongs to a sealing device, and particularly relates to a magnetic fluid dynamic sealing device with long service life and light weight.
Background
The existing magnetic fluid sealing structure generally comprises a shell with a hollow cavity, a rotating shaft, and a permanent magnet and a pole shoe arranged between the rotating shaft and the shell for magnetic fluid sealing. The rotating shaft is made of steel with large mass, the self weight of the aircraft is a main influence factor for the aviation aircraft, the weight of the material has the greatest influence on aviation parts, and the weight of the material is reduced, so that the aircraft can safely and efficiently complete flight tasks. Therefore, the titanium alloy material is adopted as the main material for the magnetic fluid sealing, so that the light modification of aerospace can be realized. However, the magnetic fluid sealing structure using titanium alloy material as the rotating shaft has the following defects: 1. the magnetic conductivity is poor, a magnetic line of force loop cannot be formed to stabilize the magnetic fluid at the sealing gap, so that the magnetic fluid leaks to influence the sealing performance; 2 because the titanium alloy material has low surface hardness in the long-term service process, wear will be generated too fast, the radial clearance is increased, the magnetic field gradient between the radial clearance and the radial clearance is weakened, the pressure difference force is increased, the pressure bearing capacity is reduced, and finally the sealing failure is caused.
Disclosure of Invention
The invention aims to solve the problems and provide a lightweight magnetohydrodynamic sealing device which has a simple structure, high sealing performance and stability and long service life.
The purpose of the invention can be achieved by adopting the following technical scheme:
the magnetic hydrodynamic sealing device comprises a shell, a rotating shaft, a permanent magnet and pole shoes, wherein the permanent magnet and the pole shoes are arranged in the shell; the outer circumference of the pole shoe is hermetically connected with the inner wall of the shell, a gap is formed between the inner circumference of the pole shoe and the outer surface of the rotating shaft, and the gap is filled with magnetic fluid; the rotating shaft is made of a titanium alloy material, and the outer circumference of the rotating shaft is provided with a wear-resistant magnetic coating; the permanent magnet generates magnetic induction lines which pass through the pole shoe, the magnetic fluid and the wear-resistant magnetic conduction coating to form a high-density magnetic loop.
As a preferred scheme, the wear-resistant magnetic conductive coating is of a gradient coating structure, the number of the coating layers is 1-10, and the thickness of each layer is 0.05-5 mm.
As a preferable scheme, the rotating shaft is rotatably mounted on the housing through bearings, the number of the bearings is two, and the permanent magnet and the pole shoe are arranged between the two bearings.
Preferably, the outer circumference of the pole shoe is provided with an annular groove, and a sealing ring is arranged in the annular groove to connect the outer circumference of the pole shoe with the inner wall of the shell in a sealing manner.
As a preferred scheme, the rotating shaft is a stepped shaft, and the two bearings are respectively arranged on one side of the shaft shoulder.
Preferably, the distance between the inner circumference of the pole shoe and the outer circumference of the shaft is 1 to 5 mm.
Preferably, the permanent magnet is an axially magnetized permanent magnet ring.
As a preferred scheme, the radius difference between two adjacent stages of stepped shafts on the rotating shaft is 2-10 mm.
Preferably, the bearing is a ball bearing.
The implementation of the invention has the following beneficial effects:
the invention mainly solves the technical problems that the existing magnetic fluid dynamic sealing structure cannot realize a high-density magnetic line loop and cause magnetic fluid leakage due to abrasion of a rotating shaft, the sealing is invalid, the existing magnetic fluid dynamic sealing structure has large quality and the like. The rotating shaft of the invention adopts titanium alloy material, thus greatly reducing the whole weight of the whole device and realizing the purpose of light structure. By cladding the magnetic conductive coating on the surface of the rotating shaft, the device can form high-density magnetic induction lines to stably and reliably limit the magnetic fluid at the gap between the rotating shaft and the pole shoe when in work, thereby enhancing the sealing performance of the whole structure; the magnetic conductive coating has the advantages of low coercive force, high saturation magnetic induction intensity and high magnetic conductivity, can reduce energy loss during working to the maximum extent, improves the structural reliability, and has the advantages of simple structure, high sealing performance and stability and long service life.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of a long-life and light-weight magnetohydrodynamic sealing device according to the present invention.
Fig. 2 is a schematic diagram of a magnetic induction line loop and a wear-resistant magnetic conductive coating on the surface of a rotating shaft of the magnetic hydrodynamic sealing device with long service life and light weight.
Fig. 3 is a microscope photograph of the thickness of the wear-resistant magnetic conductive coating on the surface of the rotating shaft in the embodiment of the magnetic hydrodynamic sealing device with long service life and light weight of the invention.
Fig. 4 is a microscope photograph of the thickness of the wear-resistant magnetic conductive coating on the surface of the pole shoe in the embodiment of the magnetic hydrodynamic sealing device with long service life and light weight of the invention.
Fig. 5 is a magnetization curve of wear-resistant magnetic conductive coatings on the surfaces of the rotating shaft and the pole shoe in the embodiment of the magnetic hydrodynamic sealing device with long service life and light weight.
FIG. 6 shows Rockwell hardness values of wear-resistant magnetic conductive coatings on the surfaces of the rotating shaft and the pole shoe in an embodiment of the magnetic hydrodynamic sealing device with long service life and light weight.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Referring to fig. 1, 2 and 5, the present embodiment relates to a long-life and light-weight magnetic hydrodynamic sealing device, which includes a housing 1, a rotating shaft 2, and a permanent magnet 3 and a pole shoe 4 which are disposed in the housing 1, wherein the rotating shaft 2 is rotatably mounted on the housing 1, the permanent magnet 3 is disposed on an inner wall of the housing 1, and the pole shoe 4 is disposed on two sides of the permanent magnet 3 on the inner wall of the housing 1; the outer circumference of the pole shoe 4 is hermetically connected with the inner wall of the shell 1, a gap is formed between the inner circumference of the pole shoe 4 and the outer surface of the rotating shaft 2, and the gap is filled with a magnetic fluid 5; the rotating shaft 2 is made of alloy materials, and the outer circumference of the rotating shaft 2 is provided with a wear-resistant magnetic coating 6; the permanent magnet 3 generates magnetic induction lines which pass through the pole shoe 4, the magnetic fluid 5 and the wear-resistant magnetic conduction coating 6 to form a high-density magnetic loop.
The rotating shaft 2 of the device is made of titanium alloy materials, so that the whole weight of the whole device is greatly reduced, and the purpose of light structure is realized. By cladding the wear-resistant magnetic conductive coating 6 on the surface of the rotating shaft 2, the device can form high-density magnetic induction lines to stably and reliably limit the magnetic fluid 5 at the gap between the rotating shaft 2 and the pole shoe 4 during working, so that the sealing performance of the whole structure is enhanced; the magnetic conductive coating 61 has low coercive force, high saturation magnetic induction intensity and high magnetic conductivity, can reduce energy loss during working to the maximum extent, improves structural reliability, and has the advantages of simple structure, high sealing performance and stability and long service life.
As shown in fig. 6, the wear-resistant magnetic conductive coating 62 is formed by cladding the outer surface of the rotating shaft 2 with a soft magnetic alloy and a ceramic hardened phase through laser. The wear-resistant magnetic conductive coating 62 is added with the ceramic strengthening phase, so that the mechanical property of the rotating shaft 2 can be improved, the abrasion of the rotating shaft 2 during working is reduced, and the service life of the rotating shaft 2 is prolonged.
The rotating shaft 2 is rotatably mounted on the shell 1 through a bearing 7, the number of the bearings 7 is two, and the permanent magnet 3 and the pole shoe 4 are arranged between the two bearings 7. The permanent magnet 3 has a gap with the outer circumference of the rotating shaft 2.
The rotating shaft 2 is a stepped shaft, and the two bearings 7 are respectively arranged on one side of the shaft shoulder 21. Under the limiting action of the two bearings 7 and the shaft shoulder 21, the rotating shaft 2 cannot move in the axial direction. The inner circumference of the pole piece 4 is contacted with the outer circumference of the section with larger diameter of the rotating shaft 2 through the magnetic fluid 5.
The outer circumference of the pole shoe 4 is provided with an annular groove 41, and a sealing ring 42 is arranged in the annular groove 41 to hermetically connect the outer circumference of the pole shoe 4 with the inner wall of the shell 1. The seal ring 42 is an O-ring.
As shown in fig. 3 and 4, the distance between the inner circumference of the pole piece 4 and the outer circumference of the rotating shaft 2 is 1 to 5 mm.
The inner circumference of the pole shoe 4 is provided with serrations 43. The number of the serrations 43 is set to 3 to 10.
The permanent magnet 3 is an axial magnetizing permanent magnet ring.
The radius difference between two adjacent stages of stepped shafts on the rotating shaft 2 is 2-10 mm.
The thickness of the wear-resistant magnetic conduction gradient coating 6 is 0.1-5 mm, the thickness of the magnetic conduction coating 61 is 0.1-4.9 mm, and the thickness of the wear-resistant coating 62 is 0.1-4.9 mm. More preferably, the wear-resistant magnetic conductive coating 62 is a gradient coating structure, the number of coating layers is 1-10, and the thickness of each layer is 0.05-5 mm.
The bearing 7 is a ball bearing. Of course, if the shaft 2 is subjected to a large axial force, the bearing 7 should be a thrust bearing.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (9)
1. The magnetic fluid dynamic sealing device is characterized by comprising a shell, a rotating shaft, a permanent magnet and a pole shoe, wherein the permanent magnet and the pole shoe are arranged in the shell; the outer circumference of the pole shoe is hermetically connected with the inner wall of the shell, a gap is formed between the inner circumference of the pole shoe and the outer surface of the rotating shaft, and the gap is filled with magnetic fluid; the rotating shaft is made of a titanium alloy material, and the outer circumference of the rotating shaft is provided with a wear-resistant magnetic coating; the permanent magnet generates magnetic induction lines which pass through the pole shoe, the magnetic fluid and the wear-resistant magnetic conduction coating to form a high-density magnetic loop.
2. The magnetic hydrodynamic sealing device of claim 1, wherein the wear-resistant magnetic conductive coating has a gradient coating structure, the number of coating layers is 1-10, and the thickness of each layer is 0.05-5 mm.
3. The long life, lightweight magnetic hydrodynamic sealing device of claim 1 wherein the shaft is rotatably mounted to the housing by two bearings and the permanent magnets and pole pieces are disposed between the two bearings.
4. The magnetic hydrodynamic sealing device of claim 1, wherein the pole piece has an annular groove on its outer circumference, and a sealing ring is disposed in the annular groove to connect the outer circumference of the pole piece with the inner wall of the casing.
5. The magnetic hydrodynamic seal device of claim 3, wherein the shaft is a stepped shaft, and the two bearings are respectively disposed on one side of the shoulder.
6. The long-life light-weight magnetohydrodynamic sealing device of claim 5, wherein the distance between the inner circumference of the pole piece and the outer circumference of the rotating shaft is 1 to 5 mm.
7. The long life, lightweight magnetohydrodynamic seal of claim 1, wherein said permanent magnets are permanent magnet rings of axially magnetized type.
8. The magnetic hydrodynamic sealing device of claim 5, wherein the radius difference between two adjacent stepped shafts on the rotating shaft is 2-10 mm.
9. The long life, lightweight magnetic hydrodynamic sealing device of claim 3 wherein said bearing is a ball bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110333014.5A CN113074253A (en) | 2021-03-29 | 2021-03-29 | Long-life light magnetohydrodynamic sealing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110333014.5A CN113074253A (en) | 2021-03-29 | 2021-03-29 | Long-life light magnetohydrodynamic sealing device |
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| CN113074253A true CN113074253A (en) | 2021-07-06 |
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| CN202110333014.5A Pending CN113074253A (en) | 2021-03-29 | 2021-03-29 | Long-life light magnetohydrodynamic sealing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046355A (en) * | 2021-11-26 | 2022-02-15 | 天津中德应用技术大学 | Hydrokinetic fluid sealing device |
| CN116865143A (en) * | 2023-08-08 | 2023-10-10 | 广东工业大学 | Rotary magnetic anti-falling protection device |
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| CN107882999A (en) * | 2017-12-13 | 2018-04-06 | 广西科技大学 | A kind of embedded device for sealing magnetic fluid of magnetic source |
| CN107906209A (en) * | 2017-12-13 | 2018-04-13 | 广西科技大学 | A kind of magnetic fluid sealing structure for concentric double-shaft |
| CN108266533A (en) * | 2018-02-11 | 2018-07-10 | 广西科技大学 | A kind of staggered magnetic fluid sealing structure |
| CN108869753A (en) * | 2018-08-13 | 2018-11-23 | 广西科技大学 | A kind of magnetic fluid sealing structure |
| CN110016356A (en) * | 2019-04-17 | 2019-07-16 | 青岛科技大学 | A kind of 5KG use for laboratory automation cracking apparatus and cleavage method |
| CN110094509A (en) * | 2019-05-21 | 2019-08-06 | 北京空间飞行器总体设计部 | Magnet fluid sealing axis with heat-proof device |
| CN111593344A (en) * | 2020-07-10 | 2020-08-28 | 广东工业大学 | Titanium alloy surface high-permeability wear-resistant coating material for magnetic fluid sealing and preparation method and application thereof |
-
2021
- 2021-03-29 CN CN202110333014.5A patent/CN113074253A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107882999A (en) * | 2017-12-13 | 2018-04-06 | 广西科技大学 | A kind of embedded device for sealing magnetic fluid of magnetic source |
| CN107906209A (en) * | 2017-12-13 | 2018-04-13 | 广西科技大学 | A kind of magnetic fluid sealing structure for concentric double-shaft |
| CN108266533A (en) * | 2018-02-11 | 2018-07-10 | 广西科技大学 | A kind of staggered magnetic fluid sealing structure |
| CN108869753A (en) * | 2018-08-13 | 2018-11-23 | 广西科技大学 | A kind of magnetic fluid sealing structure |
| CN110016356A (en) * | 2019-04-17 | 2019-07-16 | 青岛科技大学 | A kind of 5KG use for laboratory automation cracking apparatus and cleavage method |
| CN110094509A (en) * | 2019-05-21 | 2019-08-06 | 北京空间飞行器总体设计部 | Magnet fluid sealing axis with heat-proof device |
| CN111593344A (en) * | 2020-07-10 | 2020-08-28 | 广东工业大学 | Titanium alloy surface high-permeability wear-resistant coating material for magnetic fluid sealing and preparation method and application thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046355A (en) * | 2021-11-26 | 2022-02-15 | 天津中德应用技术大学 | Hydrokinetic fluid sealing device |
| CN116865143A (en) * | 2023-08-08 | 2023-10-10 | 广东工业大学 | Rotary magnetic anti-falling protection device |
| CN116865143B (en) * | 2023-08-08 | 2024-02-02 | 广东工业大学 | Rotary magnetic anti-falling protection device |
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Application publication date: 20210706 |