阅读说明：本技术 一种磁悬浮密封轴承 (Magnetic suspension sealing bearing ) 是由 王前进 于 2021-02-02 设计创作，主要内容包括：本发明公开了一种磁悬浮密封轴承,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；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；“V”型间隙中填充有磁流体,所述磁流体在凹槽外侧第三永磁体的磁极作用下,聚集在凹槽底部,形成“V”型密封带；所述第三永磁体固定在外环上。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密封轴承。(The invention discloses a magnetic suspension sealing bearing, which comprises an inner ring and an outer ring, wherein the outer ring is of an annular structure, and the inner side of the outer ring is provided with a V-shaped groove; 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; magnetic fluid is filled in the V-shaped gap and is gathered at the bottom of the groove under the action of the magnetic pole of a third permanent magnet on the outer side of the groove to form a V-shaped sealing strip; the third permanent magnet is fixed on the outer ring. The invention provides a sealed magnetic suspension sealing 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 sealed bearing is characterized in that: the device comprises an inner ring and an outer ring, wherein the outer ring is of an annular structure, and a V-shaped groove is formed in the inner side of the outer ring; 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; magnetic fluid is filled in the V-shaped gap and is gathered at the bottom of the groove under the action of the magnetic pole of a third permanent magnet on the outer side of the groove to form a V-shaped sealing strip; the third permanent magnet is fixed on the outer ring.

2. A magnetic levitation sealed bearing according to claim 1, wherein: the outer ring is composed of a jacket and end covers fixed on two sides of the jacket.

3. A magnetic levitation sealed bearing according to claim 1, wherein: and the outer ring is provided with an injection opening.

4. A magnetic levitation sealed bearing according to claim 1, wherein: and a liquid carrying strip for increasing the contact area with the magnetic fluid is arranged in the gap.

5. A magnetic levitation sealed bearing according to claim 1, wherein: the third permanent magnet is in an annular structure, adopts radiation magnetization and is a monopole radiation ring.

6. A magnetic levitation sealed bearing according to claim 1, wherein: and a limiting part is arranged between the outer ring and the inner ring.

Technical Field

The invention belongs to the field of mechanical engineering bearings, and particularly relates to a sealed magnetic suspension sealed bearing with a low 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 sealing 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 sealing bearing comprises an inner ring and an outer ring, wherein the outer ring is of an annular structure, and the inner side of the outer ring is provided with a V-shaped groove; 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; magnetic fluid is filled in the V-shaped gap and is gathered at the bottom of the groove under the action of the magnetic pole of a third permanent magnet on the outer side of the groove to form a V-shaped sealing strip; the third permanent magnet is fixed on the outer ring; 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 are used for forming a magnetic channel, reducing magnetic leakage, enhancing the magnetic field intensity in the gap and optimizing the magnetic field distribution; the structural forms of the outer ring and the salient poles jointly create a gap with a V-shaped section, and magnetic fluid is filled in the gap; the magnetic poles on the inner side of the third permanent magnet provide a radial magnetic field for the magnetic fluid in a close distance, so that the two ends of the magnetic fluid generate a potential energy moving radially outwards, the magnetic fluid is further promoted to be accumulated at the bottom of the groove to form a sealing strip, the static pressure balance of the fluid in the U-shaped pipe is realized, the sealing strip is wholly deviated to achieve new balance under the condition that the pressure difference exists between the two ends of the magnetic fluid, the sealing surface cannot be damaged, and the sealing effect is not influenced; when the salient pole or the concave pole in a rotating state drives the magnetofluid to rotate, the magnetofluid can generate centrifugal force, the direction of the centrifugal force is also outward in the radial direction, the magnetofluid enhances the potential accumulated to the bottom of the concave pole under the equidirectional superposition effect of the magnetic force and the centrifugal force, according to the principle of static pressure balance of the fluid in the U-shaped tube, the pressure difference between two ends of the magnetofluid is zero, when the pressure difference is not zero, the magnetofluid can be wholly deviated in a gap to form liquid level height difference between two ends, so that the balanced pressure difference is realized, the higher the rotating speed is, the larger the centrifugal force is, the extremely small liquid level height difference can resist extremely strong external pressure difference, the extremely good dynamic sealing effect can be ensured, the problem that the sealing thickness is stretched and thinned and punctured due to the influence of the centrifugal force of the magnetofluid in a high-speed state is not worried about, the stronger the capacity of resisting the external pressure difference, the more suitable the working condition that the external pressure difference increases along with the increase of the rotating speed, and the self-regulation capacity is strong; 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 is composed of a jacket and end covers fixed on two sides of the jacket; the beneficial effects are that: and a combined ground form is adopted, so that the permanent magnets can be conveniently installed, and the assembly difficulty is reduced.

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

Preferably, a carrier liquid strip for increasing the contact area with the magnetic fluid is arranged in the gap and is fixed on the rotating part; the beneficial effects are that: the liquid carrying bar is used as an extension part of the outer ring or the salient pole, so that the surface contact area of the outer ring or the salient pole and the magnetic fluid is indirectly increased, the capacity of the outer ring or the salient pole for driving the magnetic fluid to rotate is enhanced, the magnetic fluid can obtain more energy to rotate, and a larger centrifugal force is generated; 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 is in an annular structure, is magnetized by radiation and is a monopole radiation ring; the beneficial effects are that: the magnetic poles of the monopole radiation ring are respectively positioned at the inner side and the outer side, as is known, the magnetic poles are the parts with the strongest magnetic force in the magnet, the magnetic induction lines are distributed most densely, the magnetic field lines which are closer to the magnetic poles at the inner side of the annular permanent magnet are in a radial distribution state, the grooves are tightly attached to the magnetic poles at the inner side of the annular permanent magnet and are positioned at the center, so that the whole magnetic fluid sealing strip is positioned at the optimal position where the magnetic poles provide the magnetic field in a short distance, the maximum radial magnetic force can be obtained, the magnetic fluid is further promoted to be accumulated at the bottom of the grooves to form the sealing strip, the static. The permanent magnet can be formed by combining a plurality of fan-shaped permanent magnets in a staggered manner, a radiation ring can be adopted for the annular permanent magnet with a small radius, the processing is easy, but the processing is not easy for the annular permanent magnet with a large diameter, and the processing difficulty can be reduced by adopting a combined manner; in order to make the magnetic field distribution more uniform, the sector permanent magnets are arranged in a staggered manner, and a radiation magnetizing or radial magnetizing mode is adopted.

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.

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 that the fluid is balanced in the U-shaped pipe by static pressure is utilized, so that the magnetic fluid forms a U-shaped sealing belt, the sealing belt not only ensures the characteristic of a low friction pair of the magnetic fluid, but also eliminates the risk of sealing failure of the magnetic fluid due to the action of centrifugal force; 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 levitation sealed bearing according to a first embodiment;

FIG. 2 is a schematic structural diagram of the monopole radiating ring according to the first embodiment;

FIG. 3 is a schematic structural diagram of a first embodiment in which the third permanent magnet is combined;

FIG. 4 is a schematic view of the equilibrium state of the seal in the presence of a pressure differential according to the first embodiment;

FIG. 5 is a schematic view of the magnetic levitation sealed bearing according to the second embodiment;

in the figure: 1. an outer ring; 1-1, coating; 1-2, right end cover; 1-3, a left 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; 5-1, arc magnetic shoe; 6. a magnetic fluid; 7. carrying a liquid bar; 8. a limiting part.

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 to 4, a magnetic suspension seal 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, and the outer ring is formed by combining an outer sleeve 1-1, a right end cover 1-2 and a left end cover 1-3, the right end cover 1-2 and the left 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; magnetic fluid 6 is filled in the V-shaped gap, and the magnetic fluid 6 is gathered at the bottom of the groove under the action of the magnetic pole of a third permanent magnet 5 outside the groove to form a V-shaped sealing strip; the third permanent magnet 5 is of an annular structure, adopts radiation magnetization, is a monopole radiation ring, and is fixed in the mounting groove of the outer ring 1.

According to the principle of static pressure balance of fluid in the U-shaped pipe, when the sealing belt is in a static sealing state, the magnetic fluid 6 keeps balance under the action of the magnetic poles right above the grooves; if there is no pressure difference at the two ends of the magnetic fluid 6, the height difference h of the liquid level at the two ends is zero, if the pressure at one end is increased, the magnetic fluid 6 will wholly shift to the side with low pressure until a new balance state is reached, at this moment, the height difference h of the liquid level is formed, and the magnetic fluid 6 in the height difference zone balances the external pressure difference under the action of magnetic force; when the sealing belt is in a dynamic sealing state, the magnetic fluid 6 in a rotating state is acted by magnetic force and centrifugal force, the magnetic fluid and the centrifugal force are mutually superposed to provide a radial force field together to realize the static pressure balance of the U-shaped pipe, the higher the rotating speed is, the larger the centrifugal force is, the extremely small liquid level height difference h can resist extremely strong external pressure difference change, the excellent dynamic sealing effect is ensured, and the problem that the sealing fails because the thickness of the magnetic fluid 6 is thinned and punctured is not needed to be worried about; in order to enhance the capacity of the salient pole 2-1 in a rotating state to drive the magnetic fluid 6, a carrier liquid bar 7 can be arranged on the top of the salient pole 2-1; it should be noted that the third permanent magnet 5 may be formed by combining a plurality of arc-shaped magnetic tiles 5-1, so as to reduce the manufacturing cost of the permanent magnet.

Example two

As shown in fig. 5, a magnetic suspension seal 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, and the V-shaped groove is formed by combining an outer sleeve 1-1, a right end cover 1-2 and a left end cover 1-3, the right end cover 1-2 and the left 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; magnetic fluid 6 is filled in the V-shaped gap, and the magnetic fluid 6 is gathered at the bottom of the groove under the action of the magnetic pole of a third permanent magnet 5 outside the groove to form a V-shaped sealing strip; the third permanent magnet 5 is of an annular structure, adopts radiation magnetization, is a monopole radiation ring, and is fixed in the mounting groove of the outer ring 1; a limiting part is arranged between the outer ring 1 and the inner ring 2, the limiting part is a ball, and the ball can be positioned by a retainer and has the same structural principle as a bearing; in order to enhance the capability of the outer ring 1 to drive the magnetic fluid 6 in a rotating state, a carrier liquid strip 7 can be arranged on the inner side of the groove.

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.