CN113323960B - Elastic support tilting pad magnetic liquid double-floating thrust bearing - Google Patents

Abstract

The invention discloses a magnetic-liquid double-floating thrust bearing with a spring-supported tilting pad, which comprises a thrust disc, a thrust pad and a support ring, wherein an inner magnetic ring is arranged in the thrust disc, a plurality of elastic support components which can reciprocate up and down are arranged in the support ring in the circumferential direction, liquid is filled in the support ring, the periphery of the elastic support components can deform, the thrust pad is a spherical fulcrum thrust pad, a thrust pad magnetic block is arranged in the thrust pad, the thrust pad and the elastic support components are correspondingly arranged and arranged at the upper end of the thrust pad, and the bottom of the thrust pad is in tangential fit with the upper end surface of the elastic support component through a spherical end to form the spherical fulcrum spring-supported tilting pad. The bearing provided by the invention can generate enough magnetic force in the axial direction, can make up for the deficiency of the liquid film force generated in the axial direction, the wave spring and the pad surface form a spring support tilting pad system which can play a role of load balancing, and an oil cavity in the wave spring forms extrusion oil and shearing oil to form oil film damping, so that the bearing can play a role of vibration reduction, and the reliability and the stability of the bearing can be obviously improved.

Description

A spring-supported tilting pad magnetic-hydraulic double-floating thrust bearing

technical field

The invention belongs to the technical field of thrust bearings, and in particular relates to a spring-supported tilting pad magnetic-hydraulic double-floating thrust bearing facing small spaces and requiring a large load.

Background technique

Fluid dynamic pressure lubricated thrust bearings are widely used in various types of large rotating machinery such as pumps, presses and steam turbines. Its main function is to bear the axial load, and it is a key component to maintain the stable and reliable operation of large rotating machinery. Moreover, the water-lubricated thrust bearing has the advantages of environmental friendliness, high economic safety, low friction coefficient, and low power consumption, but the load-bearing performance needs to be further improved.

Yonnet first proposed the permanent magnet bearing, and researched its structure and algorithm on the basis of certain assumptions, which is the beginning of the modern permanent magnet bearing research. The Halbach array magnetization structure can concentrate the magnetic field on one side, and the magnetic field on the strong side is sinusoidally distributed. Through the Halbach array arrangement, the strong magnetic field can be concentrated at the bearing gap between the thrust disc and the thrust pad, resulting in greater magnetic repulsion. The introduction of magnetic force can significantly improve the axial bearing capacity of hydrodynamic lubricated thrust bearings.

Compared with foreign fluid-lubricated tilting pad bearings, uneven load distribution on the pad surface will cause uneven wear of the pad surface, lack of vibration and noise reduction performance, and can only be used for oil lubrication.

Therefore, it is necessary to propose a spring-supported tilting pad magnetic-hydraulic double-floating thrust bearing. The bearing has the advantages of large bearing capacity, good lubrication, load equalization, vibration reduction and noise reduction, and is suitable for water lubricated conditions with small space and large load bearing thrust, and oil lubricated conditions can also be selected according to the actual situation. .

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to make up for the deficiency of the simple liquid film force of the traditional tilting pad thrust bearing, and propose a spring-supported tilting pad magnetic-hydraulic double-floating thrust bearing, which can optimize the lubrication, load equalization and vibration damping performance of the bearing. , improve the stability and reliability of the bearing.

The technical scheme adopted in the present invention is: a spring-supported tiltable pad magnetic-fluid double-floating thrust bearing, which includes a thrust disc, a thrust pad and a support ring, and is characterized in that: the thrust disc is provided with an inner magnetic ring, and the support ring is provided in the thrust disc. The inner circumference of the ring is provided with a plurality of elastic support components that can reciprocate up and down, filled with liquid, and the outer circumference of which can be deformed. The components are correspondingly arranged and installed on its upper end, the outer side of the thrust shoe is fixedly connected with the outer side of the support ring through the radial positioning piece, the inner side is clearance fit with the inner side of the support ring through the radial connecting piece, and the bottom is connected with the elastic support component through the spherical end. The upper end faces are tangentially matched to form a spherical fulcrum spring-supported tiltable tile.

According to the above technical solution, the thrust pads are arranged in a fan shape and evenly distributed on the circumference. The magnetic circuit of the magnetic ring in the thrust disc and the thrust pad is arranged such that the magnetization method is axial Halbach array magnetization, and the magnetic field is concentrated at the bearing gap. .

According to the above technical solution, the thrust pad includes a thrust pad sheath with a fan-shaped groove, an inner magnetic ring of the fan-shaped thrust pad and a fan-shaped thrust pad surface, and a spherical fulcrum is provided at the lower end of the thrust pad sheath, and the inner magnetic field of the plurality of fan-shaped thrust pads The rings are arranged longitudinally and glued together and then installed in the fan-shaped groove of the thrust shoe sheath, and the upper end thereof is fixed by the fan-shaped thrust shoe surface.

According to the above technical solution, the connecting piece is a key provided on the radially inner circular surface of the thrust shoe sheath, and a threaded hole of a certain depth is drilled on the radially outer circular surface of the thrust shoe sheath for connecting with the positioning member Threaded connection is fixed.

According to the above technical solution, the thrust shoe sheath is made of stainless steel, and the thrust shoe surface is made of polymer material, wherein the magnetic block, the thrust shoe sheath and the thrust shoe surface are bonded by super glue.

According to the above technical solution, the thrust disk includes a thrust disk sheath, a magnetic ring in the thrust disk and a thrust disk base, and the connection between the magnetic rings in the thrust disk and the connection between the magnetic ring in the thrust disk and the thrust disk sheath adopts The super glue bonding process is used to connect the thrust disc base and the thrust disc sheath with fasteners.

According to the above technical solution, the elastic support assembly includes a screw rod with a T-shaped cross section, an elastic sealing ring sealingly connected to the outer periphery of the screw rod, and a bottom ring sealingly connected to the lower end of the sealing ring. A spring is sleeved on the screw rod, and the wave spring The lower end of the seal is in contact with the bottom ring, and the elastic sealing ring is filled with lubricating liquid.

According to the above technical solution, the cross section of the spring is a wave spring with a parallel rectangular structure.

According to the above technical solution, a circular groove is set at the bottom of the support ring for fixing the bottom ring, and the inner wall of the support ring is drilled with a number of keyway holes equal to the surface of the thrust pad, and the keyway hole is slightly larger than the key of the thrust pad sheath in the circumferential direction; The outer wall of the ring is drilled with a circular hole with a diameter slightly larger than the outer diameter of the positioning pin, so that the thrust pad is connected with the support ring through the key and the positioning pin.

According to the above technical scheme, the materials of the inner magnetic ring and the magnetic block of the thrust pad are selected from rare earth permanent magnet materials.

The beneficial effects obtained by the present invention are:

1. Magnetic force and liquid film force jointly provide bearing capacity

The magnetic-hydraulic double-floating bearing structure is proposed. The bearing load is jointly borne by the magnetic force and the liquid film force. The introduction of the magnetic force can make up for the shortage of the liquid film force. The stiffness of the magnetic-hydraulic composite bearing is greater than that of the traditional pure magnetic bearing.

2. It has good load-balancing and lubricating properties.

The spring-supported tiltable pad structure can make the bearing even when the height of the pad surface is inconsistent, through the elastic deformation of the spring, the bearing capacity acting on the pad surface can be uniform, and when the fluid dynamic pressure is lubricated, it can also adapt to the inclination angle of the pad surface to achieve Good effect of lubrication under different working conditions.

3. It has good vibration damping performance and improves stability.

The cross section of the wave spring is parallel and rectangular, and the extrusion and shearing oil film formed at the gap of the spring forms oil film damping in the radial sealing cavity of the spring, which can play a good vibration damping effect and improve the stability of the bearing.

Description of drawings

FIG. 1 is a schematic diagram of bearing assembly provided by an embodiment of the present invention.

2a and 2b are schematic structural diagrams of a thrust shoe sheath provided by an embodiment of the present invention.

3a and 3b are schematic structural diagrams of a magnetic block and a magnetic ring according to an embodiment of the present invention, respectively.

FIG. 4 is a Halbach array arrangement of magnetization of the magnetic ring in the thrust disk and the magnet block in the thrust pad provided by the embodiment of the present invention.

FIG. 5 is a schematic assembly diagram of the elastic support assembly provided by the embodiment of the present invention.

6 is a schematic diagram showing the principle of oil film damping formed by squeezing oil and shearing oil in a spring sealing cavity provided by an embodiment of the present invention.

FIG. 7 is a schematic structural diagram of a support ring provided by an embodiment of the present invention.

In the picture: 1 Thrust disc sheath; 2 Thrust disc inner magnetic ring; 3 Thrust disc base; 4 Thrust pad sheath; 5 Thrust pad surface; 6 Thrust pad inner magnet; 7 Positioning pin; 10 elastic sealing ring; 11 bottom ring; 12 support ring; 13 spherical end.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in FIG. 1 , this embodiment provides a spring-supported tilting pad magnetic-fluid double-floating thrust bearing, which includes a thrust disc, a thrust pad and a support ring. The thrust disc is provided with an inner magnetic ring 2, and the support ring is provided with an inner magnetic ring 2. The inner circumference is provided with a plurality of elastic support components that can reciprocate up and down, and the interior is filled with liquid and its outer circumference can be deformed. The components are correspondingly arranged and installed on its upper end, the outer side of the thrust shoe is fixedly connected to the outer side of the support ring through the radial positioning member 7, the inner side is clearance fit with the inner side of the support ring through the radial connecting member, and the bottom is elastically supported through the spherical end 13. The upper end faces of the components are tangentially matched to form a spherical fulcrum spring-supported tiltable tile. The present invention proposes a magnetic-hydraulic double-floating bearing structure. The bearing capacity is jointly borne by the liquid film force at the gap and the magnetic repulsion force generated between the thrust disk magnetic ring 2 and the thrust pad magnet block 6. The introduction of the magnetic force can make up for the lack of the liquid film force. The disadvantage of the magnetic-hydraulic composite bearing is greater than that of the traditional pure magnetic bearing.

The thrust disk includes a thrust disk sheath 1, a thrust disk inner magnetic ring 2 and a thrust disk base 3. The structure of the thrust disk inner magnetic ring 2 is shown in Figure 3a, which is composed of a plurality of inner magnetic rings 2. The connection between the magnetic rings 2 in the thrust disk and the connection between the magnetic ring 2 in the thrust disk and the thrust disk sheath 1 adopts a super glue bonding process, and the thrust disk base 3 and the thrust disk sheath 1 are connected by screws.

The thrust shoe includes a thrust shoe sheath 4 with a fan-shaped groove, an inner magnetic ring 6 of the fan-shaped thrust shoe, and a fan-shaped thrust shoe surface 5. A spherical fulcrum 13 is provided at the lower end of the thrust shoe sheath 4. The rings 6 are arranged longitudinally and are bonded by super glue, and then the glued magnetic ring is glued into the fan-shaped groove of the thrust tile sheath 4 with super glue, and then the thrust tile surface 5 is bonded to the thrust tile sheath 4. The thrust shoe sheath 4 is made of stainless steel, and the thrust shoe surface 5 is made of polymer material, wherein the magnetic block, the thrust shoe sheath 4 and the thrust shoe surface 5 are bonded by super glue.

As shown in Figures 2a and 2b, the connecting piece is a key provided on the radially inner circular surface of the thrust shoe sheath, and a threaded hole of a certain depth is drilled on the radially outer circular surface of the thrust outer sheath. It is screwed and fixed with the positioning member, wherein the positioning member 7 is a positioning pin.

The material used for the inner magnetic ring 2 and the thrust shoe magnet block 6 in the described thrust disk is rare earth permanent magnet material. One side of the magnetic field is concentrated at the bearing gap, which in turn produces a greater magnetic repulsion.

The elastic support assembly includes a screw 8 with a T-shaped cross section, an elastic sealing ring 10 sealingly connected to the outer periphery of the screw, a bottom ring 12 sealingly connected to the lower end of the sealing ring, and a wave spring 9 is sleeved on the screw. The spring structure is shown in FIG. 5 , which is made of spring steel, with a sealing elastic ring 10 arranged around the circumference and a bottom ring 11 at the lower end. The four parts are bonded by sealant, and the elastic sealing ring is filled with lubricating liquid. The material of the screw 8 is stainless steel, the upper end face of the screw 8 is tangent to the spherical surface of the spherical tilting tile, and the material of the elastic ring 10 is rubber. The design of the rectangular-section wave spring proposed by the present invention, and the oil film damping formed by the squeeze oil and the shear oil, can well improve the vibration damping ability and stability of the bearing.

The principle of the wave spring is shown in Figure 6. When the spring 9 is under pressure, the oil at the spring gap is squeezed, and the oil between the elastic sealing ring 10 and the spring 9 is subjected to shear force, forming an overall damping force. Reduce the vibration of the thrust pad in the axial direction and improve the stability of the bearing.

The structure of the support ring is shown in FIG. 7 , a circular groove is set at the bottom of the support ring 12 for fixing with the bottom ring 11 of the wave spring, and the inner wall of the support ring 12 is drilled with the same number of keyway holes as the tile surface. , the keyway hole is slightly larger than the key of the thrust pad sheath 4 in the circumferential direction; drill a circular hole with a diameter slightly larger than the outer diameter of the positioning pin 7 on the outer wall of the support ring, so that the thrust pad is connected with the support ring through the key and the positioning pin 7.

The elastic support tilting pad magnetic-fluid double-floating thrust bearing provided by the present invention has the following working process: the thrust disc rotates clockwise during operation, and the axial thrust generated at the same time acts on the thrust pad surface; the lubricating liquid rotates with the thrust disc The wedge-shaped gap is formed between the thrust plate and the thrust pad, which generates hydrodynamic pressure. Under the action of the hydrodynamic pressure, the spring 9 is pressed to produce elastic deformation. clearance, which in turn produces good dynamic pressure lubrication.

The shear oil and squeeze oil formed by the wave spring produce oil film damping, which can more effectively reduce the vibration of the thrust pad in the axial direction, so that the noise of the equipment during operation is reduced and the stability is improved.

The above-described embodiments are some, but not all, embodiments of the present application. The detailed descriptions of the embodiments of the application are not intended to limit the scope of the application as claimed, but are merely representative of selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

Claims (10)

1. a spring-supported tilting pad magnetic-fluid double-floating thrust bearing, comprising a thrust disc, a thrust pad and a support ring, it is characterized in that: the thrust disc is provided with an inner magnetic ring, and in the support ring circumferential direction is provided with a plurality of Up and down reciprocating motion, the interior is filled with liquid, and the outer circumference can be deformed. The upper end of the elastic support assembly, the outer side of the thrust shoe is fixedly connected with the outer side of the support ring through the radial positioning member, the inner side is clearance fit with the inner side of the support ring through the radial connection member, and the bottom is tangentially matched with the upper end surface of the elastic support assembly through the spherical end, Form a spherical fulcrum to support the tiltable tile. 2. The elastic-supported tiltable pad magnetic-fluid double-floating thrust bearing according to claim 1, characterized in that: the thrust pads are arranged in a fan shape and evenly distributed on the circumference, and the magnetic force of the magnetic ring in the thrust disc and the thrust pad is arranged. The circuit is arranged to magnetize the axial Halbach array magnetization, and the magnetic field is concentrated at the bearing gap. 3. The elastically supported tiltable pad magnetic-hydraulic double-floating thrust bearing according to claim 1 or 2, wherein the thrust pad comprises a thrust pad sheath with a fan-shaped groove, an inner magnetic ring of the fan-shaped thrust pad and a fan-shaped thrust pad surface , a spherical fulcrum is arranged at the lower end of the thrust tile sheath, the inner magnetic rings of the plurality of sector-shaped thrust tiles are longitudinally arranged and bonded together and then installed in the sector-shaped groove of the thrust tile sheath, and the upper end of the sector-shaped thrust tile surface passes through fixed. 4. The elastically supported tilting pad magnetic-hydraulic double-floating thrust bearing according to claim 3, wherein the connecting piece is a key provided on the radial inner surface of the thrust pad sheath, A threaded hole with a certain depth is drilled on the radial outer surface of the sleeve for threaded connection and fixation with the positioning piece. 5. The elastic-supported tilting pad magnetic-liquid double-floating thrust bearing according to claim 3, characterized in that: the thrust pad sheath is made of stainless steel, and the thrust pad surface is selected from polymer materials, wherein the magnetic block and the thrust pad protect A super glue bonding process is used between the sleeve and the thrust pad. 6. The elastically supported tiltable pad magnetic-fluid double-floating thrust bearing according to claim 1 or 2, wherein the thrust disc comprises a thrust disc sheath, an inner magnetic ring of the thrust disc and a thrust disc base, and the thrust disc comprises a thrust disc sheath. The connection between the magnetic rings in the disk and the connection between the magnetic ring in the thrust disk and the thrust disk sheath adopts the super glue bonding process, and the thrust disk base and the thrust disk sheath are connected by fasteners. 7. The elastically supported tiltable pad magnetic-hydraulic double-floating thrust bearing according to claim 1 or 2, wherein the elastic support assembly comprises a screw with a T-shaped cross section and an elastic sealing ring sealingly connected to the outer periphery of the screw . The bottom ring sealingly connected with the lower end of the sealing ring is sleeved with a spring on the screw rod, the lower end of the spring is in contact with the bottom ring, and the elastic sealing ring is filled with lubricating liquid. 8 . The elastic-supported tilting pad magnetic-hydraulic double-floating thrust bearing according to claim 7 , wherein the cross-section of the spring is a wave spring with a parallel rectangular structure. 9 . 9. The elastic-supported tilting pad magnetic-fluid double-floating thrust bearing according to claim 8, characterized in that: a circular groove is arranged at the bottom of the support ring for fixing the bottom ring, and the inner wall of the support ring is drilled with the thrust pad There are an equal number of keyway holes, and the keyway hole is slightly larger than the key of the thrust pad sheath in the circumferential direction; a circular hole with a diameter slightly larger than the outer diameter of the positioning pin is drilled on the outer wall of the support ring, so that the thrust pad is connected with the support ring through the key and the positioning pin. 10. The elastic-supported tilting pad magnetic-fluid double-floating thrust bearing according to claim 1 or 2, characterized in that the materials of the inner magnetic ring and the thrust pad magnetic block are selected from rare earth permanent magnet materials.

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