阅读说明：本技术 一种磁悬浮轴承 (Magnetic suspension bearing ) 是由 王前进 于 2021-01-25 设计创作，主要内容包括：本发明公开了一种磁悬浮轴承,包括有内环和外环,所述外环呈环状结构,内侧设有“V”型凹槽,由外套及固定在外套两侧的端盖组合成；所述内环上设有凸极,凸极顶部置于凹槽内,与凹槽之间形成“V”型间隙；所述外环凹槽两侧设有第一永磁体,第一永磁体的磁极面与凹槽的斜面平行；凸极上设有第二永磁体,所述第二永磁体的磁极面与第一永磁体的磁极面平行相对,与第一永磁体之间产生斜向的磁斥力。本发明根据流体在U型管中静压平衡的原理提供了一种具有低摩擦系数且适合高转速的密封磁悬浮轴承。(The invention discloses a magnetic suspension bearing, which comprises an inner ring and an outer ring, wherein the outer ring is in an annular structure, the inner side of the outer ring is provided with a V-shaped groove, and the outer ring is composed of an outer sleeve and end covers fixed on the two sides of the outer sleeve; salient poles are arranged on the inner ring, the tops of the salient poles are arranged in the grooves, and V-shaped gaps are formed between the salient poles and the grooves; first permanent magnets are arranged on two sides of the outer ring groove, and magnetic pole surfaces of the first permanent magnets are parallel to the inclined surface of the groove; and a second permanent magnet is arranged on the salient pole, and the magnetic pole surface of the second permanent magnet is parallel and opposite to the magnetic pole surface of the first permanent magnet, so that an oblique magnetic repulsion force is generated between the second permanent magnet and the first permanent magnet. The invention provides a sealed magnetic suspension bearing which has a low friction coefficient and is suitable for high rotating speed according to the principle of static pressure balance of fluid in a U-shaped pipe.)

1. A magnetic suspension bearing is characterized in that: the device comprises an inner ring and an outer ring, wherein the outer ring is of an annular structure, the inner side of the outer ring is provided with a V-shaped groove, and the outer ring is composed of an outer sleeve and end covers fixed on two sides of the outer sleeve; salient poles are arranged on the inner ring, the tops of the salient poles are arranged in the grooves, and V-shaped gaps are formed between the salient poles and the grooves; first permanent magnets are arranged on two sides of the outer ring groove, and magnetic pole surfaces of the first permanent magnets are parallel to the inclined surface of the groove; and a second permanent magnet is arranged on the salient pole, and the magnetic pole surface of the second permanent magnet is parallel and opposite to the magnetic pole surface of the first permanent magnet, so that an oblique magnetic repulsion force is generated between the second permanent magnet and the first permanent magnet.

2. A magnetic suspension bearing according to claim 1, characterized in that: third permanent magnets are arranged on two sides of the outer ring or the inner ring at the bottom of the gap; magnetic fluid is filled in gaps on two sides of the bottom, and the magnetic fluid forms magnetic fluid sealing belts under the action of magnetic poles of the third permanent magnet respectively; filling transition fluid with density not less than that of the magnetic fluid in the bottom gap sealed by the magnetic fluid sealing tapes on the two sides; the transition fluid and the magnetic fluid are jointly combined into a V-shaped liquid sealing belt.

3. A magnetic suspension bearing according to claim 1, characterized in that: and the outer ring or the inner ring is provided with an excitation body of a winding coil.

4. A magnetic suspension bearing according to claim 1, characterized in that: and a limiting part is arranged between the outer ring and the inner ring.

5. A magnetic suspension bearing according to claim 2, wherein: the jacket is provided with at least one injection opening.

6. A magnetic suspension bearing according to claim 2, wherein: and pole shoes are arranged on the side edges of the permanent magnets.

7. A magnetic suspension bearing according to claim 2, wherein: and a liquid carrying bar for increasing the contact area of the rotating component with the magnetic fluid and the transition fluid is arranged in the gap.

8. A magnetic suspension bearing according to claim 2, wherein: the third permanent magnet and the first permanent magnet or the second permanent magnet are designed in an integrated mode.

Technical Field

The invention belongs to the field of mechanical engineering bearings, and particularly relates to a sealed magnetic suspension bearing which is low in friction coefficient and suitable for high rotating speed.

Technical Field

In order to improve the energy transfer efficiency between rotating movable parts, reduce friction loss and reduce the friction coefficient of the movable parts, the research on engineering machinery is always the key point, in some working environments, sealing treatment needs to be carried out between the movable parts, and the problem that how to have an extremely low friction coefficient between the rotating parts while ensuring the sealing performance is urgently needed to be broken through.

The magnetic bearing has low friction coefficient and is widely applied to high-end products, but the magnetic bearing has insufficient sealing performance, and the magnetic fluid which is closely related to the magnet is taken as a special functional material and plays a great role in mechanical sealing, the principle is that the magnetic fluid is restrained by a magnetic field to fill a sealing space to form a liquid O-shaped sealing ring, and the proper carrier fluid can well infiltrate a sealing surface to achieve a very good sealing effect, and when the saturated vapor pressure of the carrier fluid is low enough, the carrier fluid is difficult to volatilize even in a high vacuum environment so as to be applied to vacuum sealing, how to combine the magnetic bearing and the magnetic fluid sealing becomes a problem which is researched at present, and the existing magnetic fluid dynamic sealing structure comprises a static magnetic pole and a rotary magnetic pole, the magnetic fluid is restrained in a magnetic circuit gap formed by the static magnetic pole and the rotary magnetic pole by the axial magnetic pulling force of the two magnetic poles, form sealed, in the operation in-process, the magnetic current produces radial centrifugal force outwards because rotatory on the rotating surface, and the magnetic current in the operation in-process can break loose the influence of the constraint of magnetic force and take place the cave in because of the effect of centrifugal force, leads to the effective seal thickness of magnetic current body "O type sealing washer" to obviously reduce, and sealing performance worsens, when being in high-speed operation in-process, can lead to sealed the inefficacy even, and how to overcome the sealed problem that loses efficacy of magnetic current body and need solve at a high speed also urgently.

Disclosure of Invention

Aiming at the defects of the prior art, the invention combines the principle of static pressure balance of fluid in the U-shaped pipe and utilizes the centrifugal force generated by the rotation of the fluid to provide the sealed magnetic suspension bearing which has low friction coefficient and is suitable for high rotating speed.

In order to achieve the purpose, the invention adopts the technical scheme that:

a magnetic suspension bearing comprises an inner ring and an outer ring, wherein the outer ring is of an annular structure, the inner side of the outer ring is provided with a V-shaped groove, and the outer ring is composed of an outer sleeve and end covers fixed on two sides of the outer sleeve; salient poles are arranged on the inner ring, the tops of the salient poles are arranged in the grooves, and V-shaped gaps are formed between the salient poles and the grooves; first permanent magnets are arranged on two sides of the outer ring groove, and magnetic pole surfaces of the first permanent magnets are parallel to the inclined surface of the groove; the salient pole is provided with a second permanent magnet, and the magnetic pole surface of the second permanent magnet is parallel and opposite to the magnetic pole surface of the first permanent magnet, so that an oblique magnetic repulsion force is generated between the second permanent magnet and the first permanent magnet; the beneficial effects are that: the first permanent magnet and the second permanent magnet form symmetrical magnetic repulsion in the oblique direction by utilizing the properties of the magnets, so that the outer ring simultaneously exerts force on the inner ring in the radial direction and the axial direction to balance the gravity or the rotating torque of the inner ring, and the inner ring is suspended in the groove to form a non-contact bearing with low friction coefficient; the outer sleeve and the end covers fixed on the two sides of the outer sleeve can be made of magnetic conductive materials and used for forming a magnetic channel, reducing magnetic leakage, enhancing the magnetic field intensity in the gap and optimizing the magnetic field distribution.

Preferably, both sides of the outer ring or the inner ring at the bottom of the gap are provided with third permanent magnets; magnetic fluid is filled in gaps on two sides of the bottom, and the magnetic fluid forms magnetic fluid sealing belts under the action of magnetic poles of the third permanent magnet respectively; filling transition fluid with density not less than that of the magnetic fluid in the bottom gap sealed by the magnetic fluid sealing tapes on the two sides; the transition fluid and the magnetic fluid are jointly combined into a V-shaped liquid sealing belt; the beneficial effects are that: the structural forms of the outer ring and the inner ring jointly create a gap with a U-shaped section, and the magnetic fluid is filled in the gaps at the two sides; the magnetic poles on the side of the third permanent magnet provide a magnetic field for the magnetic fluid in a close distance, the magnetic poles are used as the parts with the strongest magnetic force in the permanent magnet, so that the magnetic fluid is gathered around the magnetic poles, magnetic fluid sealing bands are respectively formed in gaps on two sides, transition fluid with the density not less than that of the magnetic fluid is filled in the bottom gap sealed by the magnetic fluid sealing bands on the two sides, and the density of the general magnetic fluid is 1.2 multiplied by 10³Kg/m³～1.35×10³Kg/m³The transition fluid can be selected from saturated saline, glycerol and other liquids which are difficult to be compatible with the magnetic fluid; the transition fluid and the magnetic fluid are combined together at the bottom of the groove to form a V-shaped continuous liquid sealing belt; under the static sealing state, the magnetic fluid sealing belts at two sides play a role of sealing and simultaneously seal the transition fluid between the magnetic fluid sealing belts to jointly form a liquid sealing belt, so that the static pressure balance of the fluid in the U-shaped pipe is realized, and under the condition that pressure difference exists at two ends of the liquid sealing belt, the liquid sealing belt formed by the magnetic fluid and the transition fluid can be integratedThe body deviation reaches new balance, the sealing surface cannot be damaged, and the sealing effect is not influenced; under the dynamic sealing state, when the outer ring or the inner ring under the rotation state drives the magnetic fluid and the transition fluid to rotate, the magnetic fluid and the transition fluid can generate centrifugal force simultaneously, because the density of the transition fluid is not less than that of the magnetic fluid, the transition fluid is always positioned at the bottom of the magnetic fluid, then according to the principle of static pressure balance of the fluid in a U-shaped pipe, when the pressure difference between two ends is zero, the liquid level height difference between the two ends is zero, when the pressure difference is not zero, the liquid sealing strip formed by the magnetic fluid and the transition fluid can be wholly deviated in a gap to form the liquid level height difference between the two ends, so that the balance pressure difference is higher, the centrifugal force is higher, the extremely small liquid level height difference can resist extremely strong external pressure difference, the extremely good dynamic sealing effect can be ensured, and the problem that the sealing failure is caused by the stretching, thinning and breakdown of the sealing thickness due to the, particularly, when the rotating speed is higher, the centrifugal force is higher, the capacity of resisting the external pressure difference is stronger, the self-regulation capacity is strong, and the self-regulation device is suitable for the working condition that the external pressure difference is increased along with the increase of the rotating speed; according to the physical relation among pressure, pressure intensity and area, in order to further increase the capacity of the magnetic fluid for resisting external pressure difference under the influence of magnetic force, the flow area at the U-shaped gap is smaller towards the bottom.

Preferably, the outer ring or the inner ring is provided with an exciting body of a winding coil; the beneficial effects are that: the exciting body is fixed on the static component, the exciting body wound with the coil generates a magnetic field after being electrified, and the intensity change of the magnetic field generated by the exciting body can be controlled by changing the current, so that the sealing intensity is controllable, and the sealing device is suitable for working occasions with special requirements.

Preferably, a limiting part is arranged between the outer ring and the inner ring; the beneficial effects are that: the position relation between the outer ring and the inner ring is locked, so that the relative displacement between the outer ring and the inner ring is prevented, and the sealing effect is ensured; the limiting part is preferably a rolling body, such as a ball, a needle roller and the like, and the rolling body is positioned by a retainer, and the structure principle of the bearing is the same.

Furthermore, the permanent magnet is of an annular structure and adopts axial magnetization; the beneficial effects are that: the magnetic poles of the axially magnetized permanent magnet ring are positioned at two sides of the permanent magnet, and as is known, the magnetic poles are the strongest parts in the magnet, and the magnetic induction lines are distributed most densely; the annular permanent magnet with large diameter is not easy to process, and the processing difficulty can be reduced by adopting a combined mode.

Preferably, the jacket is provided with at least one injection port; the beneficial effects are that: the gap can be conveniently filled with magnetic fluid and transition fluid, and the filling opening is sealed after the filling is finished.

Preferably, the side of the permanent magnet is provided with a pole shoe; the beneficial effects are that: the pole shoe can obtain better magnetic field linear distribution, and a multi-stage magnetic fluid sealing tape can be established in the gap, so that the sealing effect is achieved, each stage of magnetic fluid sealing tape can generally bear certain pressure difference, the total bearing pressure is the sum of the pressure differences of all stages, and the total pressure resistance is increased along with the increase of the stages of the magnetic fluid sealing tapes.

Preferably, a carrier liquid strip for increasing the contact area with the magnetic fluid is arranged in the gap; the beneficial effects are that: the liquid carrying strips are fixed on the rotating outer ring or inner ring and serve as extension parts of the outer ring or inner ring, the liquid carrying strips indirectly increase the surface contact area of the outer ring or inner ring with the magnetic fluid and the transition fluid, and the capacity of the outer ring or inner ring for driving the magnetic fluid and the transition fluid to rotate together is enhanced, so that the magnetic fluid and the transition fluid can obtain more energy to rotate and generate larger centrifugal force; the carrier liquid bar can be made of a material with a sponge structure, such as high-density sponge, and is mainly characterized by flexibility and porosity, fluid can freely shuttle in pores of the carrier liquid bar without affecting the fluidity of the carrier liquid bar and further without affecting the sealing effect of the fluid, and more importantly, the sponge structure of the carrier liquid bar is criss-cross, so that the capacity of the rotating part for driving the magnetic fluid to rotate is greatly increased; in general, the carrier strip may be replaced with batt fiber or down for cost savings.

Preferably, the third permanent magnet and the first permanent magnet or the second permanent magnet are designed integrally; the beneficial effects are that: the number of parts is reduced, the installation is convenient, and the manufacturing cost is reduced.

Compared with the prior art, the invention has the beneficial effects that: 1. according to the properties of the magnet, the inner ring is suspended in the groove by utilizing the magnetic repulsion with oblique symmetry to form a non-contact bearing with extremely low friction coefficient; 2. the principle of static pressure balance of fluid in the U-shaped pipe is utilized to promote the magnetic fluid and the transition fluid to be combined to form a U-shaped liquid sealing belt, and the liquid sealing belt not only ensures the characteristic of a low friction pair of the magnetic fluid, but also eliminates the risk of sealing failure caused by the action of centrifugal force of the magnetic fluid; 3. the centrifugal force is changed from the harmful surface to the beneficial surface, the higher the rotating speed is, the larger the centrifugal force is, the stronger the sealing effect is, the underwater propeller is particularly suitable for being applied, and the self-adjustment performance is strong; 4. the related parts have simple structures and low manufacturing cost; 5. the magnetic fluid sealing has the advantages of no abrasion, long service life and low power consumption.

Drawings

FIG. 1 is a schematic view of a magnetic suspension bearing according to a first embodiment;

FIG. 2 is a schematic view of a magnetic suspension bearing according to a second embodiment;

FIG. 3 is a schematic view of a magnetic suspension bearing according to a third embodiment;

FIG. 4 is a schematic view of a magnetic suspension bearing according to the fourth embodiment;

in the figure: 1. an outer ring; 1-1, coating; 1-2, a left end cover; 1-3, a right end cover; 1-4, an injection port; 2. an inner ring; 2-1, salient pole; 2-2, an inner sleeve; 3. a first permanent magnet; 4. a second permanent magnet; 5. a third permanent magnet; 6. a magnetic fluid; 7. a transition fluid; 8. a partition plate; 9. a pole shoe; 10. a limiting part; 11. an exciter body; 11-1, a coil; 12. carrying a liquid bar.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all 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.

Example one

As shown in fig. 1, a magnetic suspension bearing comprises an outer ring 1 and an inner ring 2, wherein the outer ring 1 is in an annular structure, the inner side of the outer ring is provided with a V-shaped groove, the V-shaped groove is formed by combining an outer sleeve 1-1, a left end cover 1-2 and a right end cover 1-3, the left end cover 1-2 and the right end cover 1-3 can be fastened on two sides of the outer sleeve 1-1 by bolts, and the outer sleeve 1-1 is provided with an injection port 1-4; the inner ring 2 is formed by combining inner sleeves 2-2 and can be fastened by bolts, salient poles 2-1 are arranged on the inner ring 2, the tops of the salient poles 2-1 are arranged in the grooves, and V-shaped gaps are formed between the salient poles and the grooves; the two sides of the groove of the outer ring 1 are provided with first permanent magnets 3, and the magnetic pole surfaces of the first permanent magnets 3 are parallel to the inclined surface of the groove; a second permanent magnet 4 is arranged on the salient pole 2-1, and a magnetic pole surface of the second permanent magnet 4 is parallel and opposite to a magnetic pole surface of the first permanent magnet 3, so that an oblique magnetic repulsion force is generated between the second permanent magnet 4 and the first permanent magnet 3; third permanent magnets 5 are arranged on two sides of the outer ring 1 at the bottom of the gap; magnetic fluid 6 is filled in gaps from the injection ports 1-4 to two sides of the bottom, and the magnetic fluid 6 on the two sides respectively form magnetic fluid sealing belts under the action of the third permanent magnet 5; filling transition fluid 7 with the density not less than that of the magnetic fluid into the bottom gap sealed by the magnetic fluid sealing bands on the two sides from the injection ports 1-4, and then performing sealing treatment on the injection ports 1-4; the transition fluid 7 and the magnetic fluid 6 are combined together to form a V-shaped liquid sealing belt; a partition plate 8 is arranged between the first permanent magnet 3 and the third permanent magnet 5, the distance between the first permanent magnet and the third permanent magnet is enlarged, and the mutual magnetic influence is reduced.

According to the principle of static pressure balance of fluid in the U-shaped pipe, when a liquid sealing belt consisting of the magnetic fluid and the transition fluid is in a static sealing state, the liquid sealing belt keeps balance under the action of magnetic poles of the liquid sealing belt; if there is no pressure difference at the two ends of the magnetic fluid 6, the liquid level difference at the two ends is basically zero h3, if the pressure at one end is increased, the liquid sealing tape will be wholly deviated to the side with low pressure until a new balance state is reached, at this time, a liquid level difference h3 is formed, and the magnetic fluid 6 in the height difference tape balances the external pressure difference under the combined action of the magnetic force of the h1 section and the magnetic force of the h2 section; when the liquid sealing band is in a dynamic sealing state, the liquid sealing band in a rotating state is not only acted by magnetic force, but also acted by centrifugal force, the two are mutually superposed to provide a force field together to realize static pressure balance of fluid in the U-shaped tube, if the pressure at one end is increased, the liquid sealing band can wholly shift to the side with low pressure until a new balance state is reached, at the moment, a liquid level height difference h3 can be formed, the magnetofluid 4 in the height difference band is not only acted by the magnetic force of h1 section and the magnetic force of h2 section, but also acted by the centrifugal force of h3 section, if the density of the transition fluid 7 is greater than that of the magnetofluid 6, the centrifugal force of h4 section can also be acted, the superposition of multiple acting forces is different from the external balance pressure difference, the higher the rotating speed is, the larger the centrifugal force is the better in dynamic sealing effect.

It should be noted that, in order to enhance the capability of the rotating component to drive the magnetic fluid 6 and the transition fluid 7, the rotating component may be provided with a carrier strip 12, for example, the outer ring 1 is fixed on the stationary component, the inner ring 2 is fixed on the rotating component, and the salient pole 2-1 is disposed in the groove and may be provided with the carrier strip 12, so as to enhance the dynamic sealing capability.

Example two

As shown in fig. 2, a magnetic suspension bearing comprises an outer ring 1 and an inner ring, wherein the outer ring 1 is in an annular structure, the inner side of the outer ring is provided with a V-shaped groove, the outer ring is formed by combining an outer sleeve 1-1, a left end cover 1-2 and a right end cover 1-3, the left end cover 1-2 and the right end cover 1-3 can be fastened on two sides of the outer sleeve 1-1 by bolts, and the outer sleeve 1-1 is provided with an injection port 1-4; the inner ring 2 is provided with salient poles 2-1, the tops of the salient poles 2-1 are arranged in the grooves, and V-shaped gaps are formed between the salient poles and the grooves; the two sides of the groove of the outer ring 1 are provided with first permanent magnets 3, and the magnetic pole surfaces of the first permanent magnets 3 are parallel to the inclined surface of the groove; a second permanent magnet 4 is arranged on the salient pole 2-1, and a magnetic pole surface of the second permanent magnet 4 is parallel and opposite to a magnetic pole surface of the first permanent magnet 3, so that an oblique magnetic repulsion force is generated between the second permanent magnet 4 and the first permanent magnet 3; third permanent magnets 5 are arranged on two sides of the outer ring 1 at the bottom of the gap, and pole shoes 9 are arranged on the inner side surfaces of the third permanent magnets 5; magnetic fluid 6 is filled in the gaps on the two sides of the bottom, and the magnetic fluid 6 on the two sides respectively form magnetic fluid sealing belts under the action of the third permanent magnet 5; filling transition fluid 7 with the density not less than that of the magnetic fluid into the bottom gap sealed by the magnetic fluid sealing bands on the two sides from the injection ports 1-4, and then performing sealing treatment on the injection ports 1-4; the transition fluid 7 and the magnetic fluid 6 are combined together to form a V-shaped liquid sealing belt; a partition plate 8 is arranged between the first permanent magnet 3 and the third permanent magnet 5, the distance between the first permanent magnet and the third permanent magnet is enlarged, and the mutual magnetic influence is reduced.

The pole shoe 9 can obtain better magnetic field linear distribution, a multi-stage magnetic fluid sealing tape can be established in the gap, each stage of magnetic fluid sealing tape can bear certain pressure difference, the total pressure bearing is the sum of the pressure differences of all stages, the total pressure resistance is increased along with the increase of the stages of the magnetic fluid sealing tapes, and the static sealing capability is further enhanced.

In order to stabilize the position relation between the outer ring 1 and the inner ring 2, prevent the relative displacement between the outer ring 1 and the inner ring 2 and ensure the sealing effect, a limiting part 10 is arranged between the outer ring 1 and the inner ring 2, the limiting part 10 is a ball, and the ball is positioned by a retainer and has the same structural principle as a bearing.

EXAMPLE III

As shown in fig. 3, a magnetic suspension bearing comprises an outer ring 1 and an inner ring, wherein the outer ring 1 is in an annular structure, the inner side of the outer ring is provided with a V-shaped groove, the outer ring is formed by combining an outer sleeve 1-1, a left end cover 1-2 and a right end cover 1-3, the left end cover 1-2 and the right end cover 1-3 can be fastened on two sides of the outer sleeve 1-1 by bolts, and the outer sleeve 1-1 is provided with an injection port 1-4; the inner ring 2 is provided with salient poles 2-1, the tops of the salient poles 2-1 are arranged in the grooves, and V-shaped gaps are formed between the salient poles and the grooves; the two sides of the groove of the outer ring 1 are provided with first permanent magnets 3, and the magnetic pole surfaces of the first permanent magnets 3 are parallel to the inclined surface of the groove; a second permanent magnet 4 is arranged on the salient pole 2-1, and a magnetic pole surface of the second permanent magnet 4 is parallel and opposite to a magnetic pole surface of the first permanent magnet 3, so that an oblique magnetic repulsion force is generated between the second permanent magnet 4 and the first permanent magnet 3; third permanent magnets 5 are arranged on two sides of the outer ring 1 at the bottom of the gap; magnetic fluid 6 is filled in the gaps on the two sides of the bottom, and the magnetic fluid 6 on the two sides respectively form magnetic fluid sealing belts under the action of the third permanent magnet 5; filling transition fluid 7 with the density not less than that of the magnetic fluid into the bottom gap sealed by the magnetic fluid sealing bands on the two sides from the injection ports 1-4, and then performing sealing treatment on the injection ports 1-4; the transition fluid 7 and the magnetic fluid 6 are combined together to form a V-shaped liquid sealing belt; a partition plate 8 is arranged between the first permanent magnet 3 and the third permanent magnet 5, so that the distance between the first permanent magnet and the third permanent magnet is increased, and the magnetic influence between the first permanent magnet and the third permanent magnet is reduced; in order to control the sealing strength, if the outer ring 1 is fixed on a static component and the inner ring 2 is fixed on a rotating component, an exciting body 9 wound with a coil 9-1 is arranged on the outer ring 1; the exciter 9 is in a ring structure and is fixed on the outer ring 1, a magnetic channel is formed by the exciter, the left end cover 1-2, the right end cover 1-3 and the salient pole 2-1, the exciter wound with a coil generates a magnetic field after being electrified, the intensity of the magnetic field generated by the exciter can be controlled by changing the current, and the exciter is suitable for working occasions with special requirements.

Example four

As shown in fig. 4, a magnetic suspension bearing comprises an outer ring 1 and an inner ring, wherein the outer ring 1 is in an annular structure, the inner side of the outer ring is provided with a V-shaped groove, the outer ring is formed by combining an outer sleeve 1-1, a left end cover 1-2 and a right end cover 1-3, the left end cover 1-2 and the right end cover 1-3 can be fastened on two sides of the outer sleeve 1-1 by bolts, and the outer sleeve 1-1 is provided with an injection port 1-4; the inner ring 2 is provided with salient poles 2-1, the tops of the salient poles 2-1 are arranged in the grooves, and V-shaped gaps are formed between the salient poles and the grooves; the two sides of the groove of the outer ring 1 are provided with first permanent magnets 3, and the magnetic pole surfaces of the first permanent magnets 3 are parallel to the inclined surface of the groove; a second permanent magnet 4 is arranged on the salient pole 2-1, and a magnetic pole surface of the second permanent magnet 4 is parallel and opposite to a magnetic pole surface of the first permanent magnet 3, so that an oblique magnetic repulsion force is generated between the second permanent magnet 4 and the first permanent magnet 3; magnetic fluid 6 is filled in gaps on two sides of the bottom, and the magnetic fluid 6 on two sides respectively form magnetic fluid sealing belts under the action of the first permanent magnet 3; filling transition fluid 7 with the density not less than that of the magnetic fluid into the bottom gap sealed by the magnetic fluid sealing bands on the two sides from the injection ports 1-4, and then performing sealing treatment on the injection ports 1-4; the transition fluid 7 and the magnetic fluid 6 are combined together to form a V-shaped liquid sealing belt; the first permanent magnet 3 is designed integrally with the third permanent magnet 5 in the above-described embodiment.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.