CN103216571A

CN103216571A - Permanent magnet bearing squeeze oil film damper

Info

Publication number: CN103216571A
Application number: CN2013101517152A
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: 2013-07-24
Anticipated expiration: 2033-04-26
Also published as: CN103216571B

Abstract

The invention discloses a permanent magnet bearing squeeze oil film damper which comprises an oil film shaft neck, a bearing outer ring, a bearing inner ring and a lubricating oil cavity full of lubricating oil, wherein the bearing inner ring is sleeved on a shafting, the bearing outer ring and the oil film shaft neck are both located inside the lubricating oil cavity, and the bearing outer ring is fixedly arranged on the inner side of the oil film shaft neck. The permanent magnet bearing squeeze oil film damper further comprises an elastic squirrel-cage bar, wherein one end of the elastic squirrel-cage bar is located outside the lubricating oil cavity and is fixed, and the other end of the elastic squirrel-cage bar is fixedly connected with the oil film shaft neck. The bearing inner ring and the bearing outer ring are both magnetized in the radial direction, the opposite surface of the magnetized bearing inner ring and the opposite surface of the magnetized outer ring have like magnetic poles, and a gap is formed between the bearing inner ring and the bearing outer ring. The permanent magnet bearing squeeze oil film damper can improve damping ability and radial supporting stiffness.

Description

The 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 technique

At present, system can turn round with security and stability in order to ensure axle, and in various high-speed vertical rotating machineries such as centrifuge, turbo machine, accumulated energy flywheel, the upper end of the rotor of being everlasting adopts suspending type squeeze film damper shown in Figure 1 that system is carried out vibration damping.But this damper has 2 deficiencys: 1) radial rigidity that can provide is too small and resistance to capsizing is poor, and flywheel shaft is that the angle of inclination is excessive when causing work, easily makes motor-field vertically acute variation take place and causes low frequency precession phenomenon; 2) damping that provides is too small, when low frequency movement appears in system, the axle that can't dissipate is unnecessary energy, along with rotating machinery develops towards high speed, high power to weight ratio direction, it is big that the volume of rotor and quality become thereupon, therefore, can provide the damper of big radial rigidity and damping capacity that important industrial application value will be arranged.

Summary of the invention

Technical problem to be solved by this invention is the defective that overcomes prior art, and a kind of Permanent-magnet bearing squeeze film damper is provided, and it can improve the damping capacity and the radial support rigidity thereof of damper.

The present invention solves the problems of the technologies described above the technological scheme of taking: a kind of Permanent-magnet bearing squeeze film damper, comprise the oil film axle journal, outer race and be fixedly set in the bearing inner ring fastened of axle and the lubricant oil cavity that is full of lubricant oil, outer race and oil film axle journal all are positioned at the lubricant oil cavity, and outer race is fixedly mounted on the inboard of oil film axle journal, also comprise the elasticity squirrel-cage bar, it is external and fixing that one end of elasticity squirrel-cage bar is positioned at lubricant reservoir, the other end of elasticity squirrel-cage bar is fixedlyed connected with the oil film axle journal, the equal radial magnetizing of described bearing inner ring and outer race, and the relative one side of bearing inner ring after magnetizing and outer race is a like pole, leaves air gap between bearing inner ring and the outer race.

Further, described bearing inner ring is surrounded by ring plate in a plurality of.

Further, a side of described bearing inner ring is provided with the protecting jacket that rubs that bumps of coaxial system installation, and this bumps the slightly larger in diameter of the diameter of the protecting jacket that rubs than bearing inner ring.

Further, described elasticity squirrel-cage bar is made by stainless steel material.

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

Further, the described protecting jacket that rubs that bumps is made by bronze or polytetrafluoroethylmaterial material.

After having adopted technique scheme, the present invention has following beneficial effect:

1, the Permanent-magnet bearing of the bearing inner ring of radial magnetizing and outer race composition not only has the automatic centering effect, and because non-contact can realize zero friction;

2, when axle be angle of inclination when big, elasticity squirrel-cage bar and squeeze film can provide enough radial rigidities for axle system together;

3, rely on repulsion between bearing inner ring and the outer race, force the oil film axle journal to move radially squeeze film, dissipative system when crossing critical or the low frequency precession take place, the excess energy that system produces;

4, ring adopts a plurality of ring plates to combine in the Permanent-magnet bearing, can significantly reduce the hoop tensile stress that magnetic material is born when high speed rotating, makes it trouble free service under very high rotating speed;

5, bump the setting of the protecting jacket that rubs, thereby prevented that axle from tying up to the phenomenon of the damage bearing inner ring that bumps when radial displacement is excessive in the work.

Description of drawings

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

Among Fig. 1,9 is the soft magnetism ring; 10 is lubricant oil; 11 is wire rope; 12 is permanent-magnetic clamp;

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

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

Fig. 4 is the plan view of Fig. 3;

Arrow is represented the direction of magnetization among Fig. 1, Fig. 2 and Fig. 4.

Embodiment

Content of the present invention is easier to be expressly understood in order to make, and according to specific embodiment also in conjunction with the accompanying drawings, the present invention is further detailed explanation below.

Shown in Fig. 2～4, a kind of Permanent-magnet bearing squeeze film damper, comprise oil film axle journal 2, outer race 3 and to be fixedly set in axle be bearing inner ring 5 on 4 and the lubricant oil cavity 8 that is full of lubricant oil 7, outer race 3 and oil film axle journal 2 all are positioned at lubricant oil cavity 8, and outer race 3 is fixedly mounted on the inboard of oil film axle journal 2, also comprise elasticity squirrel-cage bar 1, it is outer and fixing that one end of elasticity squirrel-cage bar 1 is positioned at lubricant oil cavity 8, the other end of elasticity squirrel-cage bar 1 is fixedlyed connected with oil film axle journal 2, bearing inner ring 5 and outer race 3 equal radial magnetizings, and the relative one side of bearing inner ring after magnetizing 5 and outer race 3 is a like pole, leaves air gap between bearing inner ring 5 and the outer race 3.

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

In order significantly to reduce the hoop tensile stress that magnetic material is born when the high speed rotating, make it trouble free service under very high rotating speed, shown in Fig. 3,4, bearing inner ring 5 is surrounded by ring plate 5-1 in a plurality of.The number of interior ring plate 5-1 among Fig. 4 is eight, but is not limited thereto, and they can be used adhering with epoxy resin is on 4 to axle.

In order to prevent that thereby axle from being 4 to bump when radial displacement is excessive at work and damage the phenomenon of bearing inner ring 5; as shown in Figure 2; it is the protecting jacket 6 that rubs that bumps of 4 installations that one side of bearing inner ring 5 is provided with coaxial, and this bumps the slightly larger in diameter of the diameter of the protecting jacket 6 that rubs than bearing inner ring 5.Bumping the protecting jacket 6 that rubs can be made by bronze or polytetrafluoroethylmaterial material, but is 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.

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

Oil film axle journal 2 is made by exhausted magnetic material, and for example: duralumin, the trade mark are 2A13 or stainless steel, and the trade mark is 1Cr18Ni9Ti, but are not limited to these materials.

Working principle of the present invention is as follows:

During work, elasticity squirrel-cage bar 1 and squeeze film are 4 to provide radial support rigidity for axle jointly; And the repulsion between dependence bearing inner ring 5 and the outer race 3, force oil film axle journal 2 to move squeeze film, reach the purpose of dissipation energy.

Above-described specific embodiment; purpose of the present invention, technological scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. Permanent-magnet bearing squeeze film damper, comprise oil film axle journal (2), outer race (3) and be fixedly set in bearing inner ring (5) in the axle system (4) and the lubricant oil cavity (8) that is full of lubricant oil (7), outer race (3) and oil film axle journal (2) all are positioned at lubricant oil cavity (8), and outer race (3) is fixedly mounted on the inboard of oil film axle journal (2), it is characterized in that: also comprise elasticity squirrel-cage bar (1), it is outer and fixing that one end of elasticity squirrel-cage bar (1) is positioned at lubricant oil cavity (8), the other end of elasticity squirrel-cage bar (1) is fixedlyed connected with oil film axle journal (2), described bearing inner ring (5) and outer race (3) be radial magnetizing all, and the relative one side of bearing inner ring after magnetizing (5) and outer race (3) is a like pole, leaves air gap between bearing inner ring (5) and the outer race (3).

2. Permanent-magnet bearing squeeze film damper according to claim 1 is characterized in that: described bearing inner ring (5) is surrounded by ring plate (5-1) in a plurality of.

3. according to the Permanent-magnet bearing squeeze film damper of claim 1; it is characterized in that: a side of described bearing inner ring (5) is provided with that coaxial system (4) installs bumps the protecting jacket that rubs (6), and this bumps the slightly larger in diameter of the diameter of the protecting jacket that rubs (6) than bearing inner ring (5).

4. Permanent-magnet bearing squeeze film damper according to claim 1 is characterized in that: described elasticity squirrel-cage bar (1) is made by stainless steel material.

5. Permanent-magnet bearing squeeze film damper according to claim 1 is characterized in that: described oil film axle journal (2) is made by exhausted magnetic material.

6. Permanent-magnet bearing squeeze film damper according to claim 1 is characterized in that: the described protecting jacket that rubs (6) that bumps is made by bronze or polytetrafluoroethylmaterial material.