CN113175479A - Protective bearing with self-centering function for vertical magnetic bearing rack - Google Patents
Protective bearing with self-centering function for vertical magnetic bearing rack Download PDFInfo
- Publication number
- CN113175479A CN113175479A CN202110485803.0A CN202110485803A CN113175479A CN 113175479 A CN113175479 A CN 113175479A CN 202110485803 A CN202110485803 A CN 202110485803A CN 113175479 A CN113175479 A CN 113175479A
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- Prior art keywords
- bearing
- rotor
- inner ring
- shaft sleeve
- protective
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
- F16C23/06—Ball or roller bearings
- F16C23/08—Ball or roller bearings self-adjusting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/38—Ball cages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/583—Details of specific parts of races
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
The invention discloses a protective bearing system device with a self-centering function for a vertical magnetic suspension bearing rack, which comprises a bearing outer ring, a rolling body, a retainer, a bearing inner ring and a paired shaft sleeve, wherein the protective bearing needs to be capable of bearing axial load and radial load at the same time, and the bearing inner ring and the paired shaft sleeve are provided with a pair of conical surfaces which can be completely attached; the bearing system is in a static state when the rotor rotates in a suspension manner, and certain gaps exist among the rotor, the shaft sleeve and the bearing inner ring; when the suspension rotor falls, the rotor and the shaft sleeve are in contact with the inner ring of the protective bearing, and the bearing is accelerated to the rotating speed of the rotor; the shaft sleeve is tightly attached to the bearing inner ring in the axial direction due to the action of gravity, and the existence of the conical surface forms a self-centering effect on the rotor, so that the radial impact force of the rotor and the bearing inner ring is effectively reduced, and the service life of the bearing is prolonged and protected.
Description
The technical field is as follows:
the invention relates to the technical field of magnetic suspension bearing systems, in particular to a bearing protection device for the falling of a vertical magnetic suspension rotor.
Background
In the magnetic suspension bearing system, once the magnetic suspension bearing fails, the rotor will fall from the suspension state at a high speed, so a set of protection Bearings (Touchdown Bearings) is required to receive the rotor to avoid collision and damage of the rotor and the stator, and the safety and reliability of the whole set of magnetic bearing system are ensured. For the falling of the vertical magnetic suspension rotor, the rotor rotating at high speed firstly contacts the axial end face of the protection bearing in the axial direction due to the action of gravity, and simultaneously, the rotor radially contacts and collides with the inner ring under the centrifugal action due to the existence of eccentricity, and bounces and full-circle friction occur in the gap. The collision and friction of the rotor cause severe whirling motion, so that the inner ring can continuously bear contact force which is 3-10 times of the self weight of the rotor, the damage of the protective bearing can be caused, and meanwhile, the friction force and friction torque generated by the collision and friction can cause the rapid temperature rise and rapid failure of the protective bearing. At present, the problem of reliability of the protection bearing becomes one of the main bottlenecks restricting the technical development of the magnetic suspension bearing.
Aiming at the vertical magnetic suspension bearing, from the structural design angle of the protection bearing, on the premise of not increasing the complexity of the device, the contact force borne by the protection bearing in falling is reduced as much as possible, and the device plays an important role in improving the reliability of the protection bearing and prolonging the service life of the protection bearing.
Disclosure of Invention
In order to overcome the problem of insufficient reliability in the prior art, the invention provides the protective bearing with the self-centering function for the vertical magnetic bearing rack, so that the vortex response, the collision contact force and the friction heating of a rotor are reduced, and the service life of the protective bearing is effectively prolonged.
The technical scheme adopted by the invention for solving the technical problems is as follows: a protective bearing with a self-centering function for a vertical magnetic bearing rack comprises a bearing outer ring, a rolling body, a retainer, a bearing inner ring and a matched shaft sleeve;
the protective bearing needs to be capable of bearing axial load and radial load at the same time, and the sizes and technical requirements of the bearing outer ring, the rolling body and the retainer are the same as those of an angular contact ball bearing with the same specification;
the bearing inner ring and the paired shaft sleeve are provided with a pair of conical surfaces which can be completely attached, the bearing inner ring, the rolling body, the retainer and the bearing outer ring are combined into a bearing main body, and the paired shaft sleeve is directly arranged at the end part of the rotor in an interference fit manner;
the protective bearing device system is in a static non-working state when the rotor rotates in a suspension manner, and gaps exist among the rotor, the shaft sleeve and the bearing inner ring; when the rotor falls off, the rotor and the shaft sleeve are in contact with the inner ring of the protective bearing, and the bearing is accelerated to the rotating speed of the rotor;
the shaft sleeve and the bearing inner ring in the axial direction are tightly attached under the action of gravity, the rotor in the radial direction can generate bouncing collision within the range of the protective bearing inner ring, and at the moment, the shaft sleeve and the bearing inner ring have two conical surfaces which can be attached, so that the rotor has a self-centering function on the protective bearing, the radial collision force received by the protective bearing can be effectively reduced, and the service life of the protective bearing is prolonged;
the self-centering function is realized according to the fact that when the conical surface is contacted, the gravity generates a horizontal component pointing to the center of the rotor on the tangent line of the conical surface.
According to another embodiment of the present invention, further comprising: spherical rolling bodies are arranged between the bearing outer ring and the bearing inner ring, and the rolling bodies are separated by a retainer.
According to another embodiment of the present invention, further comprising: the protective bearing only works when the magnetic suspension bearing fails and the rotor falls, and does not need lubricating media to supplement the magnetic suspension bearing.
According to another embodiment of the present invention, further comprising: the radial width dimension of the matching shaft sleeve is larger than the radial width of the bearing inner ring, namely h1 is smaller than h 2.
According to another embodiment of the present invention, further comprising: the contact conical surfaces of the bearing inner ring and the paired shaft sleeve are made of materials or coatings with good wear resistance.
According to another embodiment of the present invention, further comprising:
the invention has the advantages that the invention can simultaneously provide radial and axial protection for the rotor after the magnetic suspension bearing system fails, and can simultaneously reduce the radial contact force and the friction force caused by the whirling of the rotor; in addition, when the magnetic suspension bearing suspends again, the gap between the bearing inner ring and the paired shaft sleeve can be recovered in time, so that the bearing is protected from interfering the normal operation of the magnetic suspension bearing; the reliability and the safety of the vertical type protective bearing are improved, and the detection and maintenance cost of the protective bearing is reduced.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic overall structure diagram of a protective bearing with a self-centering function for a vertical magnetic bearing stand according to the present invention;
FIG. 2 is a schematic view of the inner race structure of the protective bearing of FIG. 1;
FIG. 3 is a schematic view of the matching bushing structure of FIG. 1;
in the figure, 1, a rotor, 2, a paired shaft sleeve, 3, a bearing inner ring, 4, a rolling body, 5, a bearing outer ring, 6 and a retainer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
A protective bearing with a self-centering function according to an embodiment of the present invention will be described below with reference to fig. 1, 2, and 3.
As shown in fig. 1, the protective bearing with a self-centering function according to the embodiment of the present invention includes a rotor 1, a counter sleeve 2, a bearing inner ring 3, rolling bodies 4, a bearing outer ring 5, and a cage 6.
Specifically, the mating sleeve 2 is mounted on the rotor 1 by interference fit, the bearing inner ring 3, the rolling elements 4, the bearing outer ring 5 and the retainer 6 are separately assembled into a bearing body, the bearing inner ring 3 and the bearing outer ring 5 are coaxially arranged, the rolling elements 4 are mounted between the bearing inner ring 3 and the bearing outer ring 5, and the retainer 6 is used to space the rolling elements 4 from each other.
The rolling elements 4 can roll between inner and outer races, generally, the bearing outer race 5 is fixed to the frame by interference fit, the bearing inner race 3 can rotate along the rolling direction of the rolling elements 4, the mating sleeve 2 is fixed relative to the rotor 1, and the motion modes of the two are synchronous.
According to the protective bearing with the self-centering function for the vertical magnetic bearing rack, under the normal operation condition, the bearing inner ring 4 is not in contact with the paired shaft sleeve 2, the paired shaft sleeve 2 rotates at a high speed along with the rotor 1, and the bearing inner ring 3, the rolling body 4 and the retainer 6 are kept in a static state. When the magnetic bearing fails, the rotor 1 falls downwards due to the action of gravity, the paired shaft sleeve 2 and the bearing inner ring 3 collide and contact with each other, and due to the existence of speed difference, the rotor 1 stably falls on the protective bearing after bouncing for several times, and the paired shaft sleeve 2 and the bearing inner ring 3 reach the same rotating speed. There is a gap in the radial direction, and the rotor 1 is not constrained, so that collision and whirling may occur in the gap. However, the mating sleeve 2 and the bearing inner ring 3 are in conical surface contact, so that once the rotor 1 is eccentric relative to the bearing inner ring 3, the contact of the conical surfaces becomes uneven, and a radial supporting force opposite to the eccentric direction is generated through the component of axial gravity on the conical surfaces, so that the rotor has a tendency of resisting eccentricity, and further the eccentricity is eliminated. The embodiment can effectively reduce the whirling of the rotor, reduce the collision force between the protective bearing and the rotor, protect the system and prolong the service life of the protective bearing.
According to one embodiment of the invention, the radial width dimension of the counter sleeve 2 is greater than the radial width of the bearing inner ring 3, i.e. h1 < h 2. The purpose is to ensure that when the rotor has a whirling trend, the bearing 2 and the bearing inner ring 3 always keep the surface contact with the maximum capacity, and the condition that the surface is damaged due to overlarge local stress is avoided.
According to an embodiment of the present invention, the contact conical surfaces of the bearing inner ring 3 and the mating sleeve 2 are in continuous contact when falling, and severe friction in combination of multiple movement directions is generated at the initial stage of falling, so that in order to avoid scratches formed on the surfaces of the bearing inner ring 3 and the mating sleeve 2, which reduces the performance of the protective bearing and prolongs the service life of the protective bearing, materials or coatings with good wear resistance are used for the contact conical surfaces of the bearing inner ring 3 and the mating sleeve 2.
According to one embodiment of the invention, the protective bearing works only when the magnetic suspension bearing fails and the rotor falls, and is used as a bearing which does not work for a long time and is not supplemented by a lubricating medium, so that the design of the system is simplified, and the pollution of the rotor is avoided.
In the description herein, references to the description of "one embodiment," "an example," or "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (3)
1. A protective bearing device with a self-centering function for a vertical magnetic bearing rack comprises a bearing outer ring, a rolling body, a retainer, a bearing inner ring and a matched shaft sleeve; the method is characterized in that:
the protection bearing needs to be capable of bearing axial load and radial load at the same time, and the sizes and technical requirements of a bearing outer ring, a rolling body and a retainer are the same as those of an angular contact ball bearing with the same specification;
the protective bearing inner ring and the paired shaft sleeve are provided with a pair of conical surfaces which can be completely attached, the bearing inner ring, the rolling body, the retainer and the bearing outer ring form a bearing main body, and the paired shaft sleeve is directly arranged at the end part of the rotor in an interference fit manner;
the protective bearing device system is in a static non-working state when the rotor rotates in a suspended manner, and gaps exist among the rotor, the shaft sleeve and the bearing inner ring; when the rotor falls, the rotor and the shaft sleeve are in contact with the inner ring of the protective bearing, the bearing is accelerated to the rotating speed of the rotor, and the shaft sleeve and the inner ring of the bearing are tightly attached under the action of gravity in the axial direction.
The paired shaft sleeve and the bearing inner ring are in conical surface contact, so that once the rotor is eccentric relative to the bearing inner ring, the contact of the conical surface becomes uneven, radial supporting force opposite to the eccentric direction is generated through the component of axial gravity on the conical surface, the rotor has the tendency of resisting eccentricity, and further the eccentricity is eliminated.
2. The protective bearing device with self-centering function for a vertical magnetic bearing gantry of claim 1, wherein spherical rolling bodies are installed between the bearing outer race and the bearing inner race, the rolling bodies being spaced apart by a cage.
3. The self-centering protective bearing assembly for a vertical magnetic bearing gantry of claim 1, wherein said protective bearing is only operated in the event of a rotor drop due to failure of a magnetic bearing, without the need for a lubricating medium to supplement it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110485803.0A CN113175479A (en) | 2021-04-30 | 2021-04-30 | Protective bearing with self-centering function for vertical magnetic bearing rack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110485803.0A CN113175479A (en) | 2021-04-30 | 2021-04-30 | Protective bearing with self-centering function for vertical magnetic bearing rack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113175479A true CN113175479A (en) | 2021-07-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110485803.0A Pending CN113175479A (en) | 2021-04-30 | 2021-04-30 | Protective bearing with self-centering function for vertical magnetic bearing rack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113175479A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114211400A (en) * | 2021-12-21 | 2022-03-22 | 徐州丰禾回转支承制造股份有限公司 | Surface corrosion prevention device for wind power slewing bearing and use method thereof |
| CN114215782A (en) * | 2021-12-08 | 2022-03-22 | 苏州中科科仪技术发展有限公司 | Spindle structure of magnetic suspension molecular pump and magnetic suspension molecular pump |
| CN114542190A (en) * | 2022-03-08 | 2022-05-27 | 扬州大学 | Protection device for preventing blade disc rotor from rubbing and gas turbine thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4628522A (en) * | 1984-02-28 | 1986-12-09 | Siemens Aktiengesellschaft | X-ray tube with a magnetically seated rotary anode |
| US5166566A (en) * | 1988-06-01 | 1992-11-24 | Arthur Pfeiffer Vakuumtechnik Gmbh | Magnetic bearings for a high speed rotary vacuum pump |
| US20020181818A1 (en) * | 2001-06-04 | 2002-12-05 | Honeywell International, Inc. | Touchdown bearing assembly with actuator ring assembly |
| CN102146962A (en) * | 2011-03-30 | 2011-08-10 | 南京磁谷科技有限公司 | Radial protective bearing |
| CN105570292A (en) * | 2016-03-14 | 2016-05-11 | 江苏理工学院 | Active and passive integrated protective device capable of eliminating and recovering radial and axial clearances of outer ring of bearing |
| CN105626688A (en) * | 2016-03-14 | 2016-06-01 | 江苏理工学院 | Active and passive integrated bearing protection device for self-elimination and recovery of radial and axial rotor gaps |
| CN110645268A (en) * | 2019-08-20 | 2020-01-03 | 江苏理工学院 | Sliding block clearance elimination protection bearing device |
-
2021
- 2021-04-30 CN CN202110485803.0A patent/CN113175479A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4628522A (en) * | 1984-02-28 | 1986-12-09 | Siemens Aktiengesellschaft | X-ray tube with a magnetically seated rotary anode |
| US5166566A (en) * | 1988-06-01 | 1992-11-24 | Arthur Pfeiffer Vakuumtechnik Gmbh | Magnetic bearings for a high speed rotary vacuum pump |
| US20020181818A1 (en) * | 2001-06-04 | 2002-12-05 | Honeywell International, Inc. | Touchdown bearing assembly with actuator ring assembly |
| CN102146962A (en) * | 2011-03-30 | 2011-08-10 | 南京磁谷科技有限公司 | Radial protective bearing |
| CN105570292A (en) * | 2016-03-14 | 2016-05-11 | 江苏理工学院 | Active and passive integrated protective device capable of eliminating and recovering radial and axial clearances of outer ring of bearing |
| CN105626688A (en) * | 2016-03-14 | 2016-06-01 | 江苏理工学院 | Active and passive integrated bearing protection device for self-elimination and recovery of radial and axial rotor gaps |
| CN110645268A (en) * | 2019-08-20 | 2020-01-03 | 江苏理工学院 | Sliding block clearance elimination protection bearing device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114215782A (en) * | 2021-12-08 | 2022-03-22 | 苏州中科科仪技术发展有限公司 | Spindle structure of magnetic suspension molecular pump and magnetic suspension molecular pump |
| CN114211400A (en) * | 2021-12-21 | 2022-03-22 | 徐州丰禾回转支承制造股份有限公司 | Surface corrosion prevention device for wind power slewing bearing and use method thereof |
| CN114542190A (en) * | 2022-03-08 | 2022-05-27 | 扬州大学 | Protection device for preventing blade disc rotor from rubbing and gas turbine thereof |
| CN114542190B (en) * | 2022-03-08 | 2023-08-29 | 扬州大学 | Protection device for preventing blade disc rotor from rubbing and gas turbine thereof |
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| PB01 | Publication | ||
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Application publication date: 20210727 |