CN103216571B

CN103216571B - Permanent-magnet bearing squeeze film damper

Info

Publication number: CN103216571B
Application number: CN201310151715.2A
Authority: CN
Inventors: 王洪昌; 陈修祥; 何庆
Original assignee: Jiangsu University of Technology
Current assignee: Jiangsu University of Technology
Priority date: 2013-04-26
Filing date: 2013-04-26
Publication date: 2016-08-10
Anticipated expiration: 2033-04-26
Also published as: CN103216571A

Abstract

The invention discloses a kind of Permanent-magnet bearing squeeze film damper, including oil film axle journal, outer race and be fixedly set in bearing inner ring and the lubricating oil cavity of full lubricating oil that axle is fastened, outer race and oil film axle journal are respectively positioned in lubricant reservoir body, and outer race is fixedly mounted on the inner side of oil film axle journal, also include elastic squirrel-cage bar, it is external and fix that one end of elastic squirrel-cage bar is positioned at lubricant reservoir, the other end of elastic squirrel-cage bar is fixing with oil film axle journal to be connected, described bearing inner ring and the equal radial magnetizing of outer race, and the one side that the bearing inner ring after magnetizing is relative with outer race is like pole, air gap is left between bearing inner ring and outer race.The present invention can improve damping capacity and the radial support rigidity thereof of antivibrator.

Description

Permanent-magnet bearing squeeze film damper

Technical field

The present invention relates to a kind of Permanent-magnet bearing squeeze film damper, belong to non-contact bearing damper technique field.

Background technology

At present, can operate with security and stability in order to ensure axle system, in various high speeds such as centrifuge, turbine, accumulated energy flywheels In vertical rotating machinery, often the upper end at rotor uses the suspension squeeze film damper shown in Fig. 1 to subtract system Shake.But this antivibrator has 2 weak points: 1) radial rigidity that can provide is too small and resistance to capsizing is poor, make When becoming work, flywheel shaft system angle of inclination is excessive, easily makes motor-field occur acute variation to cause low frequency precession existing vertically As；2) damping provided is too small, when low frequency movement occurs in system, it is impossible to the energy that dissipation axle system is unnecessary, along with rotation Favourable turn tool develops towards high speed, high power to weight ratio direction, and the volume of rotor becomes big therewith with quality, accordingly, it is capable to provide bigger The antivibrator of radial rigidity and damping capacity will have important industrial application value.

Summary of the invention

The technical problem to be solved is the defect overcoming prior art, it is provided that a kind of Permanent-magnet bearing squeeze film resistance Buddhist nun's device, it can improve damping capacity and the radial support rigidity thereof of antivibrator.

The present invention solves above-mentioned technical problem and adopts the technical scheme that: a kind of Permanent-magnet bearing squeeze film damper, including Oil film axle journal, outer race and be fixedly set in bearing inner ring and the lubricating oil cavity of full lubricating oil, the axle that axle is fastened Hold outer shroud and oil film axle journal is respectively positioned in lubricant reservoir body, and outer race is fixedly mounted on the inner side of oil film axle journal, also Including elastic squirrel-cage bar, it is external and fix, the other end of elastic squirrel-cage bar that one end of elastic squirrel-cage bar is positioned at lubricant reservoir Fixing with oil film axle journal it is connected, described bearing inner ring and the equal radial magnetizing of outer race, and the bearing inner ring after magnetizing The one side relative with outer race is like pole, leaves air gap between bearing inner ring and outer race.

Further, described bearing inner ring is surrounded by multiple interior ring plates.

Further, the side of described bearing inner ring be provided with coaxial mounted with bearing inner ring touch rub protection set, this touches and rubs The diameter of protection set is more bigger than the diameter of bearing inner ring.

Further, described elastic squirrel-cage bar is made up of stainless steel material.

Further, described oil film axle journal is made up of exhausted magnetic material.

Further, the described protection set that rubs that touches is made up of bronze or polytetrafluoroethylmaterial material.

After have employed technique scheme, the present invention has a following beneficial effect:

1, the bearing inner ring of radial magnetizing and the Permanent-magnet bearing of outer race composition, not only have automatic centering effect, and And due to noncontact, it is possible to achieve zero friction；

2, when axle system angle of inclination is bigger, elastic squirrel-cage bar and squeeze film can provide the most just for axle system together Degree；

3, rely on the repulsion between bearing inner ring and outer race, force oil film axle journal to move radially squeeze film, consumption When the system of dissipating is the most critical in mistake or low frequency precession occurs, the excess energy that system produces；

4, Permanent-magnet bearing internal ring uses multiple ring plates to combine, and magnetic material can be greatly reduced and held when high-speed rotation The hoop tension being subject to, makes it trouble free service under the highest rotating speed；

5, the setting of the protection set that rubs is touched, it is therefore prevented that axle ties up to collide thus damage axle when radial displacement in work is excessive Hold the phenomenon of internal ring.

Accompanying drawing explanation

Fig. 1 is the structural representation of the suspension squeeze film damper of prior art；

In Fig. 1,9 is soft magnetism ring；10 is lubricating oil；11 is steel wire rope；12 is permanent-magnetic clamp；

Fig. 2 is the structural representation of the Permanent-magnet bearing squeeze film damper of the present invention；

Fig. 3 is the structural representation of the bearing inner ring of the present invention；

Fig. 4 is the top view of Fig. 3；

In Fig. 1, Fig. 2 and Fig. 4, arrow represents the direction of magnetization.

Detailed description of the invention

It is clearly understood to make present disclosure be easier to, below according to specific embodiment and combine accompanying drawing, to this Invention is described in further detail.

As shown in figs. 2 to 4, a kind of Permanent-magnet bearing squeeze film damper, including oil film axle journal 2, outer race 3 and solid Surely the bearing inner ring 5 being sleeved in axle system 4 and the lubricating oil cavity 8 of full lubricating oil 7, outer race 3 and oil film Axle journal 2 is respectively positioned in lubricating oil cavity 8, and outer race 3 is fixedly mounted on the inner side of oil film axle journal 2, also includes Elastic squirrel-cage bar 1, it is outer and fix that one end of elastic squirrel-cage bar 1 is positioned at lubricating oil cavity 8, elastic squirrel-cage bar 1 another One end and oil film axle journal 2 is fixing to be connected, bearing inner ring 5 and the equal radial magnetizing of outer race 3, and the bearing after magnetizing The one side that internal ring 5 is relative with outer race 3 is like pole, leaves air gap between bearing inner ring 5 and outer race 3.

Bearing inner ring 5 and outer race 3, both relative one sides are all N pole or S pole.

In order to hoop tension that magnetic material when high-speed rotation born is greatly reduced, make it under the highest rotating speed Trouble free service, as shown in Figure 3,4, bearing inner ring 5 is surrounded by multiple interior ring plates 5-1.Interior ring plate 5-1 in Fig. 4 Number is eight, but is not limited to this, adhering with epoxy resin can be used to axle system 4 they.

The phenomenon of bearing inner ring 5 is damaged in order to prevent axle system 4 radial displacement at work from colliding time excessive, as Shown in Fig. 2, the side of bearing inner ring 5 be provided with coaxial mounted with bearing inner ring 5 touch rub protection set 6, this touches the guarantor that rubs The diameter of sheath 6 is more bigger than the diameter of bearing inner ring 5.Touching the protection set 6 that rubs can be by bronze or polytetrafluoroethylmaterial material system Become, but be not limited to these materials.

Outer race 3 and bearing inner ring 5 are made by neodymium-iron-boron magnetic material.The trade mark is N40, but is not limited to this material Material.

Elastic squirrel-cage bar 1 is made up of stainless steel material, and the trade mark is 1Cr18Ni9Ti, but is not limited to this material.

Oil film axle journal 2 is made up, such as of exhausted magnetic material: duralumin, and the trade mark is 2A13 or rustless steel, and the trade mark is 1Cr18Ni9Ti, But it is not limited to these materials.

The operation principle of the present invention is as follows:

During work, elastic squirrel-cage bar 1 and squeeze film are jointly for axle system 4 offer radial support rigidity；And in relying on bearing Repulsion between ring 5 and outer race 3, forces oil film axle journal 2 to move squeeze film, reaches the purpose of dissipation energy.

Particular embodiments described above, has been carried out the purpose of the present invention, technical scheme and beneficial effect the most in detail Illustrate, be it should be understood that the specific embodiment that the foregoing is only the present invention, be not limited to the present invention, All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, should be included in this Within bright protection domain.

Claims

1. a Permanent-magnet bearing squeeze film damper, including oil film axle journal (2), outer race (3) and fixing suit Bearing inner ring (5) in axle system (4) and the lubricating oil cavity (8) of full lubricating oil (7), outer race (3) It is respectively positioned in lubricating oil cavity (8) with oil film axle journal (2), and outer race (3) is fixedly mounted on oil film axle journal (2) inner side, it is characterised in that: also include that elastic squirrel-cage bar (1), one end of elastic squirrel-cage bar (1) are positioned at lubrication Oil cavity (8) outward and is fixed, and the other end of elastic squirrel-cage bar (1) is fixing with oil film axle journal (2) to be connected, described Bearing inner ring (5) and outer race (3) all radial magnetizings, and bearing inner ring (5) after magnetizing and bearing outside The relative one side of ring (3) is like pole, leaves air gap, institute between bearing inner ring (5) and outer race (3) The side of the bearing inner ring (5) stated is provided with and bearing inner ring (5) is coaxial mounted touches protection set (6) that rubs, and this touches and rubs Protection set (6) diameter more bigger than the diameter of bearing inner ring (5), described in touch rub protection set (6) be used for preventing axle system (4) radial displacement collides time excessive thus damages the phenomenon of bearing inner ring (5) at work.

Permanent-magnet bearing squeeze film damper the most according to claim 1, it is characterised in that: in described bearing Ring (5) is surrounded by multiple interior ring plates (5-1).

Permanent-magnet bearing squeeze film damper the most according to claim 1, it is characterised in that: described elastic Mus Cage bar (1) is made up of stainless steel material.

Permanent-magnet bearing squeeze film damper the most according to claim 1, it is characterised in that: described oil film axle Neck (2) is made up of exhausted magnetic material.

Permanent-magnet bearing squeeze film damper the most according to claim 1, it is characterised in that: described touching rubs guarantor Sheath (6) is made up of bronze or polytetrafluoroethylmaterial material.