阅读说明：本技术 一种密封轴承 (Sealed bearing ) 是由 王前进 于 2021-01-21 设计创作，主要内容包括：本发明公开了一种密封轴承,包括有外环、内环、凹极及凸极,所述内环与外环通过滚动体活动连接在一起；所述凹极呈环状结构,固定在外环或内环端部,外侧设有永磁体,内侧上设有“U”型或“V”型凹槽；所述凸极固定在内环或外环上,顶部置于凹槽内,并与凹槽之间形成有“U”型或“V”型间隙；所述间隙内填充磁流体；所述磁流体在永磁体内侧磁极提供的磁场作用下克服重力向积聚在凹槽底部,并利用流体在U型管中静压平衡的原理,在凸极与凹极之间形成“U”型或“V”型的密封带。本发明所涉及的密封轴承结合了滚动轴承及磁流体密封的特点,并利用流体在U型管中静压平衡的原理及流体旋转产生的离心力,提高了磁流体的密封效果。(The invention discloses a sealed bearing, which comprises an outer ring, an inner ring, a concave pole and a salient pole, wherein the inner ring and the outer ring are movably connected together through a rolling body; the concave pole is of an annular structure and is fixed at the end part of the outer ring or the inner ring, the outer side of the concave pole is provided with a permanent magnet, and the inner side of the concave pole is provided with a U-shaped or V-shaped groove; the salient poles are fixed on the inner ring or the outer ring, the tops of the salient poles are arranged in the grooves, and U-shaped or V-shaped gaps are formed between the salient poles and the grooves; magnetic fluid is filled in the gap; the magnetic fluid overcomes the gravity to accumulate at the bottom of the groove under the action of a magnetic field provided by the magnetic poles at the inner side of the permanent magnet, and a U-shaped or V-shaped sealing strip is formed between the salient pole and the concave pole by utilizing the principle of static pressure balance of fluid in the U-shaped pipe. The sealed bearing combines the characteristics of a rolling bearing and the sealing of the magnetic fluid, and improves the sealing effect of the magnetic fluid by utilizing the principle of static pressure balance of the fluid in the U-shaped pipe and the centrifugal force generated by the rotation of the fluid.)

1. A sealed bearing, characterized by: the inner ring and the outer ring are movably connected together through a rolling body; the concave pole is of an annular structure and is fixed at the end part of the outer ring or the inner ring, the outer side of the concave pole is provided with a permanent magnet, and the inner side of the concave pole is provided with a U-shaped or V-shaped groove; the salient poles are fixed on the inner ring or the outer ring, the tops of the salient poles are arranged in the grooves, and U-shaped or V-shaped gaps are formed between the salient poles and the grooves; magnetic fluid is filled in the gap; the magnetic fluid overcomes the gravity to accumulate at the bottom of the groove under the action of a magnetic field provided by the magnetic poles at the inner side of the permanent magnet, and a U-shaped or V-shaped sealing strip is formed between the salient pole and the concave pole by utilizing the principle of static pressure balance of fluid in the U-shaped pipe.

2. A sealed bearing according to claim 1, wherein: and a liquid carrying bar for increasing the contact area with the magnetic fluid is arranged in the gap and is fixed on the rotating part.

3. A sealed bearing according to claim 1 or 2, wherein: the permanent magnet is in an annular structure, adopts radiation magnetization and is a monopole radiation ring.

4. A sealed bearing according to claim 3, wherein: the permanent magnet and the concave pole are connected into a whole and fixed on the inner ring through the rotating ring, and the salient pole is fixed on the outer ring through the supporting ring.

5. A sealed bearing according to claim 4, wherein: the outer end of the rotating ring is provided with an isolation plate, and the isolation plate is fixed on the outer ring.

6. A sealed bearing according to claim 5, wherein: and a mud throwing ring is arranged at the outer end of the isolation plate and fixed on the inner ring.

7. A sealed bearing according to claim 1, wherein: the edge of the concave pole is in contact with the salient pole to form a closed space, and the magnetic fluid is limited in the closed space of a U shape or a V shape formed between the salient pole and the concave pole.

8. A sealed bearing according to claim 1, wherein: the permanent magnet and the concave pole are connected into a whole and fixed on the outer ring; the salient pole is fixed on the inner ring.

9. A sealed bearing according to claim 1, wherein: an exciter body wound with a coil is arranged on the outer side of the permanent magnet, and generates a magnetic field after the coil is electrified; the exciter body is fixed on the outer ring.

10. A sealed bearing according to claim 9, wherein: the excitation body comprises excitation columns and excitation rings, and the excitation columns wound with coils are uniformly distributed on the excitation rings.

Technical Field

The invention belongs to the field of mechanical engineering sealing bearings, and particularly relates to a sealing bearing which has self-adjustability and is suitable for high rotating speed.

Technical Field

The bearing is an important part in modern mechanical equipment, has the main functions of supporting the rotation of a mechanical rotating body, reducing the friction coefficient in the movement process of the mechanical rotating body and ensuring the rotation precision of the mechanical rotating body, but in order to prevent dust, water and other impurities from entering the bearing and prevent a lubricant from losing, the bearing generally adopts contact type sealing, non-contact type sealing and combined type sealing, particularly when the bearing is applied underwater, the contact type sealing is adopted, the sealing friction coefficient is large, the additional loss power ratio of relevant equipment is high, a large amount of heat is generated, the sealing performance is further influenced, the service life of the bearing is shortened, and the problem needs to be solved by a sealing bearing with a low friction coefficient.

At present, the magnetic fluid seal plays a great role in mechanical seal as a sealing mode with low friction coefficient, and has the following advantages: 1. the sealing performance is good and the repair is easy; 2. no abrasion, long service life and low power consumption; 3. the magnetic fluid is restrained in a magnetic circuit gap formed by the static magnetic pole and the rotating magnetic pole by the axial magnetic pulling force of the two magnetic poles to form an O-shaped sealing ring, but in the process of high-speed operation, the magnetic fluid generates a centrifugal force facing radially outwards on a rotating surface because of rotation, the centrifugal force and the magnetic constraint force borne by the magnetic fluid are not in the same direction, therefore, the magnetic fluid in the running process can break loose the constraint of magnetic force and move due to the action of centrifugal force, so that the effective sealing thickness of the magnetic fluid O-shaped sealing ring is obviously reduced, the sealing performance is poor, even the sealing is failed, and the sealing gap of the magnetic fluid in the magnetic fluid sealing is very small, therefore, the requirement on the precision of the relative position between the moving parts is high, and the stable operation of the magnetic fluid sealing parts under high-speed rotation can be ensured only by auxiliary positioning.

Disclosure of Invention

Aiming at the defects of the prior art, the invention ingeniously combines the high-precision rotation characteristic of the bearing to ensure the precision of the relative position between each moving part in the magnetic fluid seal, and provides the magnetic fluid seal bearing which has self-adjustability and is suitable for high rotating speed by utilizing the principle of static pressure balance of fluid in a U-shaped pipe and the centrifugal force generated by fluid rotation.

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

a sealed bearing comprises an outer ring, an inner ring, a concave pole and a salient pole, wherein the inner ring and the outer ring are movably connected together through a rolling body; the concave pole is of an annular structure and is fixed at the end part of the outer ring or the inner ring, the outer side of the concave pole is provided with a permanent magnet, and the inner side of the concave pole is provided with a U-shaped or V-shaped groove; the salient poles are fixed on the inner ring or the outer ring, the tops of the salient poles are arranged in the grooves, and U-shaped or V-shaped gaps are formed between the salient poles and the grooves; magnetic fluid is filled in the gap; the magnetic fluid overcomes the gravity to accumulate at the bottom of the groove under the action of a magnetic field provided by the magnetic pole at the inner side of the permanent magnet, and a U-shaped or V-shaped sealing strip is formed between the salient pole and the concave pole by utilizing the principle of static pressure balance of fluid in the U-shaped pipe; the beneficial effects are that: under the limiting action of the rolling bodies, the outer ring and the inner ring in the sealed bearing ensure the stability of the relative positions of all moving parts in the rotating process and provide extremely strong bearing capacity, and the structural forms of the salient poles and the concave poles jointly create a gap with a U-shaped section, and magnetic fluid is filled in the gap; the magnetic poles on the inner side of the 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, 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 concave pole or the convex pole, so that the surface contact area of the concave pole or the convex pole and the magnetic fluid is indirectly increased, the capacity of the concave pole or the convex 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 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, the permanent magnet and the concave pole are connected into a whole and fixed on the rotating part, and the salient pole is fixed on the static part; the beneficial effects are that: the permanent magnet and the concave pole are connected into a whole to further shorten the distance between the magnetic pole and the magnetic fluid, so that the magnetic fluid can obtain larger magnetic force and generate stronger sealing performance; the concave pole is fixed on the rotating component, on one hand, the magnetic fluid is accumulated towards the bottom of the groove under the action of a magnetic field, the magnetic particles in the magnetic fluid are distributed unevenly under the action of the magnetic field, the concentration of the magnetic particles is denser at the part closer to the magnetic pole, and further the part closer to the magnetic pole is, the viscosity of the magnetic fluid is higher, compared with the salient pole, the concave pole rotates to drive the magnetic fluid to obtain centrifugal force, so that the sealing performance is higher in a dynamic sealing state, and the viscosity of the magnetic fluid close to the salient pole is small, the friction force between the magnetic fluid and the salient pole is small during rotation, and the heat generated during operation is relatively small; on the other hand, in the sealing structure, the concave part is arranged at the outer ring of the salient pole, the surface contact area of the concave pole and the magnetic fluid is larger than that of the salient pole and the magnetic fluid, the generated static friction force is large, the transmitted energy is large, the capacity of driving the magnetic fluid to rotate is better than that of the salient pole, and in the rotating process, the speed of the concave pole line at the outer ring is larger than that of the salient pole at the inner ring, the generated centrifugal force is larger, and the resistance to external pressure difference is better facilitated; the concave pole is preferably made of flexible materials, such as high-elasticity polymers with strong plasticity, more specifically polytetrafluoroethylene, which is resistant to high temperature and low temperature, and when the concave pole is made of flexible materials, the annular permanent magnet can be used as a support to provide powerful support for the concave pole, so that the concave pole is ensured not to deform during high-speed operation, the sealing effect is further ensured, and the number of parts is reduced; it is especially pointed out that, because the magnetic poles of the permanent magnet are respectively positioned at the inner side and the outer side, the inner side magnetic pole provides a magnetic field for the magnetic fluid, and the outer side magnetic pole can also provide a magnetic field, if a U-shaped gap is formed in the outer space of the permanent magnet, the magnetic grease can be filled in the non-Newtonian magnetic fluid with high viscosity and low cost, and an auxiliary sealing strip is formed under the action of centrifugal force.

The salient pole is arranged on the outer ring through the supporting ring, the concave pole is arranged on the inner ring through the rotating ring, the bearing is suitable for bearings with small diameters, the distance between the inner and the outer rings of the bearing is small, the wall thickness is small, the difficulty in directly processing the salient pole and the mounting groove of the permanent magnet on the outer ring or the inner ring is high, the thickness of the magnetic pole is limited by narrow space, the magnetic force of the magnetic pole on the magnetic fluid is reduced, the sealing performance is influenced, the supporting ring and the rotating ring are used as extension parts of the outer ring and the inner ring, the processing difficulty is reduced, the mounting space of the magnetic pole is increased, and the supporting ring and the salient pole can be integrally.

Preferably, the outer end of the rotating ring is provided with a separation plate, and the separation plate is fixed on the static part; the beneficial effects are that: the labyrinth type sealing structure is formed, a U-shaped gap is formed at the periphery of the permanent magnet, lubricating grease, preferably magnetic lubricating grease, can be filled in the gap, and auxiliary sealing is formed by fully utilizing the centrifugal effect generated when the rotating ring operates and the strong magnetic attraction of the magnetic pole of the permanent magnet to the magnetic lubricating grease, so that the sealing performance is improved.

Preferably, a mud throwing ring is arranged on the outer side of the isolation plate, and the isolation plate is fixed on the rotating component; the beneficial effects are that: when waterproof sealing is done, the rotatory mud ring that gets rid of at a high speed can utilize the effect of centrifugal force to throw away large granule impurity such as silt of aquatic, avoids impurity to get into the fluid seal area in, influences sealing performance.

Preferably, the female pole edge part is in contact with the salient pole to form a closed space, and the magnetic fluid is limited in a U-shaped or V-shaped closed space formed between the salient pole and the female pole; the beneficial effects are that: on one hand, the magnetic fluid can be prevented from being greatly leaked out when the magnetic fluid is separated from the constraint of magnetic force during violent vibration; on the other hand, the magnetic fluid sealing device can prevent external impurities from entering the magnetic fluid to influence the characteristics of the magnetic fluid and ensure the sealing effect.

Preferably, the salient pole is arranged on the inner ring, and the permanent magnet and the concave pole are connected into a whole and fixed on the outer ring; the beneficial effects are that: the magnetic field generator is suitable for occasions where the exciting body needs to be arranged on the outer side of the permanent magnet, the connection of a winding coil on the exciting body is convenient, the rotating salient poles drive the magnetic fluid to rotate, and the fluid generates centrifugal force.

Preferably, an exciter wound with a coil is arranged on the outer side of the permanent magnet, and the exciter generates a magnetic field after the coil is electrified to provide magnetic force; the exciter body is fixed on the outer ring; the beneficial effects are that: the exciter with the coil generates a magnetic field after being electrified, the intensity change of the magnetic field generated by the exciter can be controlled by changing the current, so that the sealing intensity is controllable, the exciter is suitable for working occasions with special requirements, and further, the exciter with the coil is fixedly arranged on a static part outside the concave pole, thereby facilitating the connection of a circuit.

Further preferably, the exciter comprises excitation columns and excitation rings, and the excitation columns wound with coils are uniformly distributed on the excitation rings; the beneficial effects are that: the excitation column wound with the coil is electrified to provide a magnetic field, and the excitation ring distributes the magnetic field along the circumference, so that the distribution uniformity of the magnetic fluid is ensured, and the sealing effect is further ensured; it should be noted that the excitation body with large diameter can be made in a form of split combination and staggered arrangement.

Preferably, the inner ring or the outer ring is provided with a seal groove; the beneficial effects are that: and the sealing performance between the bearing and other parts is ensured when the bearing is installed and matched.

Compared with the prior art, the invention has the beneficial effects that: 1. the high-precision rotation characteristic of the rolling bearing is utilized to meet the requirement of the stability of the relative position between each moving part in the magnetic fluid seal, and the stability of the seal is ensured; 2. the method for sealing the magnetic fluid by binding the magnetic fluid in the air gap of the magnetic circuit through axial magnetic tension in the conventional method is broken through, the magnetic fluid is applied with a magnetic force which faces outwards in the radial direction, and the magnetic fluid is promoted to form a U-shaped sealing strip by utilizing the principle of static pressure balance of the fluid in a U-shaped pipe, so that the sealing strip 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 parts have simple structure, low manufacturing cost and high reliability; 5. low sealing friction coefficient, long service life and low power consumption.

Drawings

FIG. 1 is a schematic view of the overall structure of the sealed bearing according to the first embodiment;

FIG. 2 is a partial schematic structural view of the sealed bearing according to the first embodiment;

FIG. 3 is a schematic structural diagram of the recess and carrier bar according to one embodiment;

FIG. 4 is a schematic structural diagram of a monopole radiation ring of the permanent magnet according to the first embodiment;

FIG. 5 is a schematic structural diagram of a permanent magnet according to the first embodiment in a combined form;

FIG. 6 is a schematic view showing an equilibrium state of the sealed bearing in the presence of a pressure difference according to the first embodiment;

FIG. 7 is a partial schematic structural view of the sealed bearing according to the second embodiment;

FIG. 8 is a schematic structural view of a seal portion in the second embodiment;

FIG. 9 is a partial schematic structural view of the sealed bearing according to the third embodiment;

FIG. 10 is a schematic structural view of a seal portion in the third embodiment;

FIG. 11 is a partial schematic structural view of the sealed bearing according to the fourth embodiment;

FIG. 12 is a schematic structural view of a seal portion in the fourth embodiment;

FIG. 13 is a schematic view of a portion of the sealed bearing according to the fifth embodiment;

FIG. 14 is a schematic structural view of a fifth embodiment of a seal part;

FIG. 15 is a structural view showing the integrated design of the exciter body according to the first embodiment;

FIG. 16 is a schematic structural diagram of the exciter body in combination according to the first embodiment;

FIG. 17 is a partial schematic view of a sealed bearing according to a sixth embodiment;

FIG. 18 is a schematic structural view of a seal portion in the sixth embodiment;

in the figure: 1. an outer ring; 2. an inner ring; 3. a rolling body; 4. salient poles; 5. a magnetic fluid; 6. a concave pole; 61. a half-arc ring; 7. carrying a liquid bar; 8. a rotating ring; 9. a permanent magnet; 9-1 of permanent magnet tiles; 10. a separator plate; 11. lubricating grease; 12. a sealing groove; 13. a support ring; 14. a stuffing box; 15. a holder; 16. a positioning frame; 17. throwing mud rings; 18. a lead slot; 19. an exciter body; 19-1, an excitation column; 19-2, a coil; 19-3, exciting a magnetic ring; 19-4, excitation tiles; 20. a fender; 21. and a secondary permanent magnet.

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 6, a sealed bearing comprises an outer ring 1, an inner ring 2, a rolling body 3 and a retainer 15, wherein the inner ring 2 rotates, a concave pole 6 and a permanent magnet 9 are connected into a whole and fixed in the inner ring 2 through a rotating ring 8, the concave pole 6 is provided with a U-shaped groove, and the concave pole 6 is formed by pouring a flexible material, such as silica gel, polytetrafluoroethylene and the like; the salient pole is fixedly arranged on the outer ring 1 through a support ring 13, the top of the salient pole is arranged in the groove, and a U-shaped gap is formed between the salient pole and the groove; the gap is filled with magnetic fluid 5; the permanent magnet 9 is in an annular structure, is magnetized by radiation and is a monopole radiation ring; the magnetic fluid 5 overcomes the gravity and accumulates towards the bottom of the groove under the action of a radial magnetic field provided by a magnetic pole at the inner side of the permanent magnet 9, and a U-shaped sealing belt is formed between the salient pole 4 and the concave pole 6 by utilizing the principle of static pressure balance of fluid in a U-shaped pipe; when the magnetic fluid is operated, the magnetic fluid 5 is driven to rotate by the concave electrode 6 in a rotating state, so that the magnetic fluid 5 generates a centrifugal force facing outwards in the radial direction; the magnetic fluid 5 is accumulated at the bottom of the U-shaped groove of the concave electrode 6 under the combined action of centrifugal force and magnetic force; in order to increase the capacity of the recessed electrode 6 for driving the magnetic fluid 5 to rotate, a liquid carrying strip 7 is bonded on the recessed electrode 6, and the liquid carrying strip 7 is made of sponge; stuffing boxes 14 are arranged at two ends of the salient poles 4 and used for preventing impurities from entering the sealing belts; the outer end of the rotating ring 8 is provided with an isolation plate 10, the isolation plate 10 is fixed on the outer ring 1, lubricating grease 11, preferably magnetic lubricating grease, is filled between the rotating ring 8 and the outer ring 1, the magnetic lubricating grease 11 is adsorbed on an outer magnetic pole under the action of the permanent magnet 9 and is not easy to leak, and when the rotating ring 8 rotates, the rotating ring 8 drives the magnetic lubricating grease 11 to generate centrifugal force to form a sealing strip in the U-shaped gap, so that an auxiliary sealing effect is achieved, and impurities can be effectively prevented from entering the U-shaped gap; the outer ring 1 and the inner ring 2 are provided with seal grooves 12.

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 5 keeps balance under the action of a magnetic pole above the concave pole 6; if there is no pressure difference at the two ends of the magnetic fluid 5, 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 5 will wholly shift to the side with low pressure until a new balance state is reached, at this time, the height difference h of the liquid level is formed, and the magnetic fluid 5 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 5 in a rotating state is under the action of magnetic force and centrifugal force, the magnetic fluid and the centrifugal force are mutually superposed to jointly provide a radial force field to realize static pressure balance of the fluid in the U-shaped pipe, the higher the rotating speed is, the larger the centrifugal force is, the smaller the 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 failure is caused by the thinned breakdown of the thickness of the magnetic fluid 5 is not worried.

It should be noted that the permanent magnet 9 in the ring structure may be designed integrally, or may be formed by combining a plurality of permanent magnet tiles 9-1, so that the magnetic field may be distributed more uniformly and conveniently, the permanent magnet tiles 9-1 may be arranged in a staggered manner, and for a large-diameter bearing, the processing cost may be greatly reduced.

Example two

As shown in fig. 7 to 8, a sealed bearing includes an outer ring 1, an inner ring 2, a rolling element 3 and a retainer 15, wherein the inner ring 2 rotates, a concave pole 6 is fixed at both ends of the inner ring 2 through a rotating ring 8, a V-shaped groove is formed on the concave pole 6, and the concave pole 6 is formed by pouring a flexible material, such as silica gel, polytetrafluoroethylene, and the like; the salient pole 4 is fixed on the outer ring 1 through a support ring 13, the top of the salient pole is arranged in the groove, and a V-shaped gap is formed between the salient pole and the groove; the gap is filled with magnetic fluid 5; the permanent magnet 9 is arranged on the outer side of the concave pole 6, the permanent magnet 9 is in an annular structure, adopts radiation magnetization, is a single-pole radiation ring, and is connected with the concave pole 6 into a whole to be fixed in the rotating ring 8; the magnetic fluid 5 overcomes the gravity and accumulates towards the bottom of the groove under the action of a radial magnetic field provided by a magnetic pole at the inner side of the permanent magnet 9, and a V-shaped sealing belt is formed between the salient pole 4 and the concave pole 6 by utilizing the principle of static pressure balance of fluid in the U-shaped pipe; the permanent magnet 9 and the concave pole 6 are connected into a whole and fixed on the rotating ring 8, and synchronously rotate along with the inner ring 2 to drive the concave pole 6 and the permanent magnet 9 to move, and the concave pole 6 in a rotating state drives the magnetic fluid 5 to rotate, so that the magnetic fluid 5 generates a radial outward centrifugal force; the magnetic fluid 5 is accumulated at the bottom of the V-shaped groove of the concave electrode 6 under the combined action of centrifugal force and magnetic force; in order to increase the capacity of the recessed electrode 6 for driving the magnetic fluid 5 to rotate, a liquid carrying strip 7 is bonded on the recessed electrode 6, and the liquid carrying strip 7 is made of sponge; stuffing boxes 14 are arranged at two ends of the salient poles 4 and used for preventing impurities from entering the sealing belts; the upper end of the top of the rotating ring 8 is provided with an auxiliary permanent magnet 21, the outer end of the rotating ring is provided with an isolation plate 10, the isolation plate 10 is tightly attached to the auxiliary permanent magnet 21 and fixed on the outer ring 1 together, and magnetic lubricating grease 11 is filled between the rotating ring 8 and the auxiliary permanent magnet 21; the outer ring 1 and the inner ring 2 are provided with seal grooves 12.

According to the principle of static pressure balance of fluid in a U-shaped pipe, when a sealing belt is in a static sealing state, a closed space is formed inside a bearing by the left magnetic fluid 5 and the right magnetic fluid 5, and the balance is kept under the action of magnetic force right above a concave pole 6; if no pressure difference exists at the two ends, the liquid level height difference h of the two magnetic fluids at the two ends is zero, if the pressure at one end is increased, the first magnetic fluid 5 is wholly deviated to one side with low pressure until new balance is achieved, at the moment, the first magnetic fluid 5 forms a liquid level height difference h1, because a closed space is formed between the two magnetic fluids 5, the pressure intensity of the closed space is increased due to space reduction, the pressure difference is further transmitted to the second magnetic fluid 5, at the moment, the second magnetic fluid 5 forms a liquid level height difference h2, and the magnetic fluids 5 in the two height difference zones jointly balance the external pressure difference under the action of magnetic force; when in a dynamic sealing state, the magnetic fluid 5 in a rotating state is under the action of magnetic force and centrifugal force, the magnetic fluid and the centrifugal force are mutually superposed to jointly provide a radial force field 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 strong external pressure difference change can be resisted by the extremely small liquid level height difference, the excellent dynamic sealing effect is ensured, and the problem that the sealing failure is caused by the breakdown of the thinned thickness of the magnetic fluid 5 is avoided.

It should be pointed out that the inner side of the concave pole 6 and the outer side of the rotating ring 8 both form a U-shaped sealing belt, when the rotating ring 8 drives the concave pole 6 to rotate, the inner sealing belt and the outer sealing belt resist external pressure difference under the same-direction superposition of centrifugal force and magnetic force, and the sealing performance is dually ensured; if not counting the cost, the magnetic grease 11 can be replaced by the magnetic fluid 5 in the third embodiment

As shown in fig. 9 to 10, a sealed bearing includes an outer ring 1, an inner ring 2, a rolling element 3 and a retainer 15, the inner ring 2 rotates, a permanent magnet 9 and a concave pole 6 are connected into a whole and fixed in a mounting groove at the end of the inner ring 2, a V-shaped groove is arranged on the concave pole 6, and the concave pole 6 is formed by pouring a flexible material, such as silica gel, polytetrafluoroethylene, etc.; the salient pole 4 is fixed on the inner ring 2 through a rotating ring, the top of the salient pole is arranged in the groove, and a V-shaped gap is formed between the salient pole and the groove; the gap is filled with magnetic fluid 5; the permanent magnet 9 is in an annular structure, is magnetized by radiation and is a monopole radiation ring; the magnetic fluid 5 overcomes the gravity and accumulates towards the bottom of the groove under the action of a radial magnetic field provided by a magnetic pole at the inner side of the permanent magnet 9, and a V-shaped sealing belt is formed between the salient pole 4 and the concave pole 6 by utilizing the principle of static pressure balance of fluid in the U-shaped pipe; when the magnetic fluid generating device operates, the magnetic fluid 5 is driven to rotate by the concave electrode 6 in a rotating state, so that the magnetic fluid 5 generates a radial outward centrifugal force; the magnetic fluid 5 is accumulated at the bottom of the V-shaped groove of the concave electrode 6 under the combined action of centrifugal force and magnetic force; in order to increase the capacity of the recessed electrode 6 for driving the magnetic fluid 5 to rotate, a liquid carrying strip 7 is bonded on the recessed electrode 6, and the liquid carrying strip 7 is made of sponge; in order to prevent the magnetic fluid from leaking during severe vibration, the edge part of the concave pole 6 is slightly contacted with the convex pole 4 to form a closed space, and the magnetic fluid 5 is sealed in the closed space; a mud throwing ring 17 is arranged on the outer side of the support ring 13, and the mud throwing ring 17 is fixed on the inner ring 2; the outer ring 1 and the inner ring 2 are both provided with a sealing groove 12.

It should be pointed out that, because the edge of the concave pole 6 slightly contacts the convex pole 4 to form a closed space, when the external pressure changes, the edge contact part can form a first protection, if the first protection fails, the magnetic fluid sealing tape implements a second protection, and the sealing effect is ensured under the double action.

The sealing bearing in which the permanent magnet and the concave pole are directly mounted on the inner ring or the outer ring needs to have a certain thickness for the inner ring or the outer ring, and is more suitable for a bearing with a larger diameter.

Example four

As shown in fig. 11 to 12, a sealed bearing includes an outer ring 1, an inner ring 2, a rolling element 3 and a retainer 15, the outer ring 1 rotates, a permanent magnet 9 and a notch 6 are integrally fixed in a mounting groove at the end of the outer ring 1, a V-shaped groove is formed on the notch 6, and the notch 6 is formed by combining half-arc rings 61 processed by hard materials; the salient pole 4 is directly fixed on the inner ring 2, the top of the salient pole is arranged in the groove, and a V-shaped gap is formed between the salient pole and the groove; the gap is filled with magnetic fluid 5; the permanent magnet 9 is in an annular structure, is magnetized by radiation and is a monopole radiation ring; the magnetic fluid 5 overcomes the gravity and accumulates towards the bottom of the groove under the action of a radial magnetic field provided by a magnetic pole at the inner side of the permanent magnet 9, and a V-shaped sealing belt is formed between the salient pole 4 and the concave pole 6 by utilizing the principle of static pressure balance of fluid in the U-shaped pipe; when the magnetic fluid generating device operates, the magnetic fluid 5 is driven to rotate by the concave electrode 6 in a rotating state, so that the magnetic fluid 5 generates a radial outward centrifugal force; the magnetic fluid 5 is accumulated at the bottom of the V-shaped groove of the concave electrode 6 under the combined action of centrifugal force and magnetic force; in order to increase the capacity of the recessed electrode 6 for driving the magnetic fluid 5 to rotate, a liquid carrying strip 7 is bonded on the recessed electrode 6, and the liquid carrying strip 7 is made of sponge; the outer end of the permanent magnet 9 is sequentially provided with a separation plate 10, a mud throwing ring 17 and a mud guard 20 from inside to outside, the separation plate 10 and the mud guard 20 are fixed on the inner ring 2, the mud throwing ring 17 is fixed on the outer ring 1, a U-shaped gap formed among the permanent magnet 9, the separation plate 10 and the mud throwing ring 17 is filled with magnetic lubricating grease 11, and large granular substances can be thrown out of a bearing by centrifugal force generated by rotation of the mud throwing ring 17; the outer ring 1 and the inner ring 2 are provided with seal grooves 12.

EXAMPLE five

As shown in fig. 13 to 16, a sealed bearing comprises an outer ring 1, an inner ring 2, rolling elements 3 and a retainer 15, wherein the inner ring 2 rotates, a concave pole 6 is fixed at the end of the inner ring 2 through a rotating ring 8, a V-shaped groove is arranged on the concave pole 6, and the concave pole 6 is formed by combining half-arc rings 61 processed by hard materials; salient poles 4 corresponding to the concave poles 6 are fixed on the outer ring 1 through a support ring 13; the tops of the salient poles 4 are arranged in the grooves, and V-shaped gaps are formed between the salient poles and the grooves; the gap is filled with magnetic fluid 5; the permanent magnet 9 and the exciter 19 are arranged on the outer side of the concave pole 6, the exciter 19, the permanent magnet 9 and the concave pole 6 are connected into a whole and are arranged on the positioning frame 16, the positioning frame 16 is arranged in the mounting groove at the end part of the outer ring 1, the permanent magnet 9 is in an annular structure, adopts radiation magnetization and is a single-pole radiation ring; the magnetic fluid 5 overcomes the gravity and accumulates towards the bottom of the groove under the action of a radial magnetic field provided by a magnetic pole at the inner side of the permanent magnet 9, and a V-shaped sealing strip is formed between the salient pole 4 and the concave pole 6 by utilizing the principle of static pressure balance of fluid in the U-shaped pipe; the permanent magnet 9 and the concave pole 6 are connected into a whole and fixed on the rotating ring 8, and when the magnetic fluid rotating device operates, the concave pole 6 in a rotating state drives the magnetic fluid 5 to rotate, so that the magnetic fluid 5 generates a radial outward centrifugal force; the magnetic fluid 5 is accumulated at the bottom of the groove of the concave 6-shaped groove under the combined action of centrifugal force and magnetic force; in order to increase the capacity of the recessed electrode 6 for driving the magnetic fluid 5 to rotate, a liquid carrying strip 7 is bonded on the recessed electrode 6, and the liquid carrying strip 7 is made of sponge; an isolation plate 10 is arranged at the outer end of the rotating ring 8, the isolation plate 10 is fixed on the outer ring 1, and magnetic lubricating grease 11 is filled in a U-shaped gap formed among the support ring 13, the rotating ring 8, the isolation plate 10 and the outer ring 1; the outer end of the isolation plate 10 is provided with a mud throwing ring 17, and the mud throwing ring 17 is fixed on the inner ring 2; the outer ring 1 and the inner ring 2 are provided with seal grooves 12.

It should be pointed out that the said exciter 19 is the ring structure, adopt the integrated design, including the exciter pole 19-1, coil 19-2 and magnetic ring 19-3, the exciter pole 19-1 which winds the coil 19-2 is distributed on the exciter ring 19-3, the said exciter 19 is placed outside the permanent magnet 9, the magnetic field that the coil 19-2 is electrified and produced is superposed with the magnetic field of the permanent magnet in the same direction, make the total intensity of magnetic field exerted on magnetic fluid increase with the increase of the electric current, and then make the sealing performance become controllable as required; the outer ring 1 is provided with a lead groove 18 of the coil 19-2.

The exciter 19 can also be formed by combining a plurality of exciter units, each exciter unit comprises an exciter post 19-1, a coil 19-2 and an exciter shoe 19-4, and the exciter post 19-1 wound with the coil 19-2 is fixed on the exciter shoe 19-4.

EXAMPLE six

As shown in fig. 17 to 18, a sealed bearing comprises an outer ring 1, an inner ring 2, rolling elements 3 and a retainer 15, wherein the inner ring 2 rotates, a concave pole 6 is fixed at the end of the inner ring 2 through a rotating ring 8, a V-shaped groove is arranged on the concave pole 6, and the concave pole 6 is formed by combining half-arc rings 61 processed by hard materials; salient poles 4 corresponding to the concave poles 6 are fixed on the outer ring 1 through a support ring 13; the tops of the salient poles 4 are arranged in the grooves, and V-shaped gaps are formed between the salient poles and the grooves; the gap is filled with magnetic fluid 5; the outer side of the concave pole 6 is provided with a permanent magnet 9 which is fixed in a mounting groove at the end part of the outer ring 1, a gap is reserved between the permanent magnet 9 and the concave pole 6, the permanent magnet 9 is in an annular structure, adopts radiation magnetization and is a single-pole radiation ring; the magnetic fluid 5 overcomes the gravity and accumulates towards the bottom of the groove under the action of a radial magnetic field provided by a magnetic pole at the inner side of the permanent magnet 9, and a V-shaped sealing strip is formed between the salient pole 4 and the concave pole 6 by utilizing the principle of static pressure balance of fluid in the U-shaped pipe; the permanent magnet 9 and the concave pole 6 are connected into a whole and fixed on the rotating ring 8, and when the magnetic fluid rotating device operates, the concave pole 6 in a rotating state drives the magnetic fluid 5 to rotate, so that the magnetic fluid 5 generates a radial outward centrifugal force; the magnetic fluid 5 is accumulated at the bottom of the groove of the concave 6-shaped groove under the combined action of centrifugal force and magnetic force; in order to increase the capacity of the recessed electrode 6 for driving the magnetic fluid 5 to rotate, a liquid carrying strip 7 is bonded on the recessed electrode 6, and the liquid carrying strip 7 is made of sponge; an isolation plate 10 is arranged at the outer end of the rotating ring 8, the isolation plate 10 is fixed on the outer ring 1, and magnetic lubricating grease 11 is filled in a U-shaped gap formed among the support ring 13, the rotating ring 8, the isolation plate 10 and the outer ring 1; the outer end of the isolation plate 10 is provided with a mud throwing ring 17, and the mud throwing ring 17 is fixed on the inner ring 2; the outer ring 1 and the inner ring 2 are provided with seal grooves 12.

It should be pointed out that, at this time, the inner side and the outer side of the concave pole 6 both form a "U" shaped sealing band, when the concave pole 6 rotates, the inner and outer sealing bands resist external pressure difference under the same direction superposition of centrifugal force and magnetic force, and sealing performance is dually ensured; the rotating ring 8 is preferably made of a magnetic conductive material so as to reduce magnetic leakage and indirectly improve the magnetic force of the permanent magnet 9 on the magnetic fluid 5; the magnetic grease 11 can be replaced by the magnetic fluid 5, if the cost is not counted.

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.