CN117605759A - Self-centering protection bearing device for vertical magnetic suspension bearing system - Google Patents
Self-centering protection bearing device for vertical magnetic suspension bearing system Download PDFInfo
- Publication number
- CN117605759A CN117605759A CN202311606995.1A CN202311606995A CN117605759A CN 117605759 A CN117605759 A CN 117605759A CN 202311606995 A CN202311606995 A CN 202311606995A CN 117605759 A CN117605759 A CN 117605759A
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- Prior art keywords
- bearing
- inner ring
- shaft sleeve
- rotor
- bearing inner
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- 239000000725 suspension Substances 0.000 title claims abstract description 21
- 238000005096 rolling process Methods 0.000 claims abstract description 21
- 230000005484 gravity Effects 0.000 claims abstract description 7
- 230000013011 mating Effects 0.000 claims description 18
- 230000001681 protective effect Effects 0.000 claims description 12
- 230000003068 static effect Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 230000001808 coupling effect Effects 0.000 abstract description 2
- 230000004044 response Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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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
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
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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
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0474—Active magnetic bearings for rotary movement
- F16C32/0485—Active magnetic bearings for rotary movement with active support of three degrees of freedom
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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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- 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
- F16C33/62—Selection of substances
Abstract
The invention discloses a self-centering protection bearing device for a vertical magnetic suspension bearing system. The bearing comprises a bearing outer ring, a bearing inner ring, rolling bodies, a retainer and a matched shaft sleeve, wherein the bearing inner ring and the matched shaft sleeve are matched through mutually-attached conical surfaces, and the matched shaft sleeve is arranged on a rotor in an interference fit manner during assembly; when the rotor is eccentric relative to the bearing inner ring, the contact between the bearing inner ring and the conical surface of the matching shaft sleeve becomes uneven, and the radial supporting force opposite to the eccentric direction is generated through the component of the axial gravity on the conical surface, so that the rotor tends to resist the eccentric direction, and the eccentric is eliminated. According to the invention, the inner ring and the matched shaft sleeve which can be completely attached to the conical surface are designed, so that the response of the falling rotor is controlled, the rotor is enabled to present a centripetal trend due to the coupling action of the axial direction and the radial direction, and the contact force and the friction force between the rotor and the protection bearing are reduced.
Description
Technical Field
The invention belongs to the technical field of magnetic suspension bearing systems, and particularly relates to a self-centering protection bearing device for a vertical magnetic suspension bearing system.
Background
The magnetic suspension bearing system is generally required to be provided with a protective bearing (Touchdown bearing) device so as to avoid serious accidents caused by high-speed falling of a rotor when the system sends an electrical fault, and conventional rolling bearings are generally adopted as protective bearing schemes in the prior art. When the magnetic suspension bearing normally operates, the rotor keeps a suspension state to rotate, a certain gap exists between the protection bearing and the rotor, and the protection bearing is in a static state. For the vertical rotor system, when the rotor falls due to the failure of the magnetic suspension bearing, the rotor firstly impacts the axial end face of the protection bearing in the axial direction, meanwhile, the rotor bounces and full-circle friction occur in a radial gap under the centrifugal action, and in the process, the protection bearing is continuously subjected to contact force which is 3-10 times of the dead weight of the rotor in the radial direction and the axial direction. The rotor is in an unstable state continuously in the falling process and cannot obtain stable intervention before stopping, and severe contact force and friction force caused by friction can cause damage such as plastic deformation, friction abrasion, severe heating and the like to the protection bearing, so that the reliability of the protection bearing is greatly reduced, and the system has the risk of serious failure accidents. At present, the problem of protecting the reliability of the bearing has become one of the main bottlenecks for restricting the technical development of the magnetic suspension bearing.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a self-centering protection bearing device for a vertical magnetic suspension bearing system. Aiming at the vertical magnetic suspension bearing system, from the structural design angle of the protection bearing device, the falling stability of the rotor is improved as much as possible, the contact force of the protection bearing in falling is reduced on the premise of not increasing the complexity of the device, and the protection bearing has important effects of improving the reliability of the protection bearing and prolonging the service life of the protection bearing.
The technical scheme adopted by the invention is as follows: the self-centering protection bearing device for the vertical magnetic suspension bearing system comprises a bearing outer ring, a bearing inner ring, rolling bodies, a retainer and a pairing shaft sleeve, wherein the bearing inner ring and the pairing shaft sleeve are matched through mutually-attached conical surfaces, and the pairing shaft sleeve is mounted on a rotor in an interference fit manner during assembly;
when the rotor is eccentric relative to the bearing inner ring, the contact between the bearing inner ring and the conical surface of the matching shaft sleeve becomes uneven, and the radial supporting force opposite to the eccentric direction is generated through the component of the axial gravity on the conical surface, so that the rotor tends to resist the eccentric direction, and the eccentric is eliminated.
Under normal operation conditions, the bearing inner ring is not contacted with the matched shaft sleeve, the matched shaft sleeve rotates along with the rotor at a high speed, and the bearing outer ring, the bearing inner ring, the rolling bodies and the retainer are kept in a static state; when the magnetic bearing fails, the rotor falls down due to the action of gravity, the matched shaft sleeve and the bearing inner ring are in collision contact, and due to the existence of speed difference, the rotor stably falls on the main body part of the protection bearing after bouncing for a plurality of times, and the matched shaft sleeve and the bearing inner ring reach the same rotating speed.
The bearing outer ring, the bearing inner ring, the rolling bodies and the retainer are individually assembled to form a protective bearing body, the bearing outer ring and the bearing inner ring are coaxially arranged, the rolling bodies are mounted between the bearing outer ring and the bearing inner ring, and the rolling bodies are spaced apart from each other by the retainer.
The inner diameter d1 of the bearing inner ring is larger than the inner diameter d2 of the matched shaft sleeve, namely d1 is larger than d2, and the radial width dimension h2 of the matched shaft sleeve is larger than the radial width h1 of the bearing inner ring, namely h1 is smaller than h2.
The angle range of the matched conical surfaces of the bearing inner ring and the matched shaft sleeve and the horizontal plane is 10 degrees to 45 degrees.
And the contact conical surfaces of the bearing inner ring and the mating shaft sleeve are provided with wear-resistant materials or coatings.
The invention can simultaneously provide radial and axial protection for the rotor after the failure of the magnetic suspension bearing system, avoid direct contact between the rotor and the stator, ensure that the rotor tends to be kept at a central stable position through axial and radial coupling, and simultaneously reduce radial contact force and friction force caused by rotor whirl; the separation design of the inner ring and the matched shaft sleeve is used as a complete solution, the structure and materials of the contact matched pair are not needed to be considered in the rotor design, and the system design flow is simplified; in addition, when the magnetic suspension bearing is suspended again, the gap between the inner ring of the bearing and the matched shaft sleeve can be recovered in time, so that the bearing is protected from being interfered with the normal operation of the magnetic suspension bearing; the reliability and the safety of the protection bearing and the magnetic suspension bearing system are improved, and the detection and maintenance cost is reduced.
According to the invention, the inner ring and the matched shaft sleeve which can be completely attached to the conical surface are designed, so that the response of the falling rotor is controlled, the rotor is enabled to present a centripetal trend due to the coupling action of the axial direction and the radial direction, and the contact force and the friction force between the rotor and the protection bearing are reduced.
The pairing shaft sleeve is used as a standard part to be installed on the rotor, the structural design of the rotor at the position is not needed to be considered additionally, the pairing shaft sleeve is not contacted with other components of the protection bearing during normal operation, the protection bearing is in a static state, and the characteristic of rotor suspension during the operation of the magnetic suspension shaft is ensured.
Compared with the traditional protection bearing, the design complexity is not increased when the rotor system is designed, and the structural design of the rotor at the position is not needed to be considered additionally; compared with a protective bearing device specially used for realizing rotor control, the device has the advantages that the existing structure is greatly simplified, and the complexity and cost of the system are reduced.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the present solution installed into a rotor system;
FIG. 3 is a schematic view of the inner ring structure of the protection bearing in FIG. 1;
fig. 4 is a schematic view of the mating sleeve structure of fig. 1.
In the figure, a bearing outer ring is shown as 1; 2-bearing inner rings; 3-rolling elements; 4-a retainer; 5-mating shaft sleeve; 6-rotor.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are given for clarity of understanding and are not to be construed as limiting the invention.
As shown in fig. 1, the self-centering protective bearing device according to the embodiment includes a bearing outer ring 1, a bearing inner ring 2, rolling elements 3, a cage 4, and a mating sleeve 5.
Specifically, the bearing inner ring 2 and the mating sleeve 5 have a pair of tapered surfaces that can be completely fitted, as shown in fig. 2, the mating sleeve 5 is mounted to the rotor 6 by interference fit during assembly, the bearing outer ring 1, the bearing inner ring 2, the rolling elements 3 and the cage 4 are individually assembled to form a protective bearing body, the bearing outer ring 1 and the bearing inner ring 2 are coaxially disposed, the rolling elements 3 are mounted between the bearing outer ring 1 and the bearing inner ring 2, and the rolling elements 3 are spaced apart from each other using the cage 4. The rolling bodies 3 can roll between the inner race and the outer race, the bearing outer race 1 is fixed on the frame through an interference fit mode and always keeps static, the rolling bodies 3 are driven to rotate in the same rolling direction when the bearing inner race 2 rotates, the pairing shaft sleeve 2 is fixed relative to the rotor 1, and the movement modes of the pairing shaft sleeve 2 and the rotor 1 are synchronous.
As shown in fig. 3 and 4, the various dimensions and technical requirements of the main body part of the protection bearing are the same as those of the angular contact ball bearing with the same specification, the inner diameter d1 of the bearing inner ring 2 is larger than the inner diameter d2 of the mating shaft sleeve 5, namely d1 > d2, and the radial width dimension h2 of the mating shaft sleeve 5 is larger than the radial width h1 of the bearing inner ring 2, namely h1 < h2. The rotor 6 is not contacted with the bearing inner ring 2 during normal operation, and meanwhile, in order to ensure that the mating shaft sleeve 5 and the bearing inner ring 2 always keep the surface contact with the maximum capability when the rotor 6 falls and has a vortex trend, the condition of surface damage caused by overlarge local stress is avoided.
According to the self-centering protection bearing device for the vertical magnetic bearing system, under the normal operation condition, the bearing inner ring 2 is not contacted with the matched shaft sleeve 5, the matched shaft sleeve 5 rotates along with the rotor 6 at a high speed, and the bearing outer ring 1, the bearing inner ring 2, the rolling bodies 3 and the retainer 4 are kept in a static state. When the magnetic bearing fails, the rotor 6 falls down due to gravity, the pairing shaft sleeve 5 and the bearing inner ring 2 are in collision contact, and due to the existence of the speed difference, the rotor 6 stably falls on the protection bearing main body part after bouncing for a plurality of times, and the pairing shaft sleeve 5 and the bearing inner ring 2 reach the same rotating speed. There is a gap in the radial direction, and the rotor 6 is not constrained, so that collision and whirl may occur in the gap. However, the mating shaft sleeve 5 and the bearing inner ring 2 are in conical surface contact, once the rotor 6 is eccentric relative to the bearing inner ring 2, the conical surface contact becomes uneven, and through the component of axial gravity on the conical surface, a supporting force with opposite radial direction relative to the eccentric direction is generated, so that the rotor tends to resist the eccentric direction, and the eccentric is eliminated. According to the embodiment, axial and radial coupling in the rotor falling process is utilized, so that whirling of the rotor can be effectively reduced, collision force between the protection bearing and the rotor is reduced, the protection effect on the system is achieved, and the service life of the protection bearing is prolonged.
According to an embodiment of the present disclosure, in order to ensure the centripetal effect of the rotor, the angle of the mating conical surface of the bearing inner ring 2 and the mating shaft sleeve 5 should not be too small, and on the other hand, in order to avoid the contact between the bearing inner ring 2 and the mating shaft sleeve 5 during the normal operation, the angle of the mating conical surface should not be too large. Therefore, the angle between the mating conical surfaces of the bearing inner ring 2 and the mating sleeve 5 and the horizontal plane should be 10 degrees to 45 degrees.
According to an embodiment of the present disclosure, the contact conical surfaces of the bearing inner ring 2 and the mating sleeve 5 are continuously contacted when the bearing inner ring falls, and severe friction combined in multiple movement directions is generated at the initial stage of falling, so in order to avoid forming scratches on the surface, reduce the performance of protecting the bearing, and improve the life of the bearing, materials or coatings with good wear resistance are required to be used for the contact conical surfaces of the bearing inner ring 2 and the mating sleeve 5.
According to one embodiment of the scheme, the protection bearing only works when the rotor falls due to failure of the magnetic suspension bearing, and is used as a bearing which does not operate for a long time, and the lubrication medium is not needed to supplement the bearing, so that the design of the system is simplified, and the pollution of the rotor is avoided.
What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (6)
1. The utility model provides a self-centering protection bearing device for vertical magnetic suspension bearing system, includes bearing outer lane (1), bearing inner circle (2), rolling element (3), holder (4), its characterized in that: the bearing further comprises a pairing shaft sleeve (5), wherein the bearing inner ring (2) and the pairing shaft sleeve (5) are matched through mutually attached conical surfaces, and the pairing shaft sleeve (5) is mounted on the rotor (6) in an interference fit mode during assembly;
when the rotor (6) is eccentric relative to the bearing inner ring (2), the contact between the bearing inner ring (2) and the conical surface of the matched shaft sleeve (5) becomes uneven, and the radial supporting force opposite to the eccentric direction is generated through the component of the axial gravity on the conical surface, so that the rotor (6) has a tendency of opposite to the eccentric direction, and the eccentric is eliminated.
2. A self-centering protective bearing arrangement for a vertical magnetic bearing system as claimed in claim 1, wherein: under normal operation conditions, the bearing inner ring (2) is not contacted with the matched shaft sleeve (5), the matched shaft sleeve (5) rotates at a high speed along with the rotor (6), and the bearing outer ring (1), the bearing inner ring (2), the rolling bodies (3) and the retainer (4) keep a static state; when the magnetic bearing fails, the rotor (6) falls down due to the action of gravity, the pairing shaft sleeve (5) and the bearing inner ring (2) are in collision contact, and due to the existence of speed difference, the rotor (6) stably falls on the protection bearing main body part after bouncing for a plurality of times, and the pairing shaft sleeve (5) and the bearing inner ring (2) reach the same rotating speed.
3. A self-centering protective bearing arrangement for a vertical magnetic bearing system as claimed in claim 1, wherein: the bearing outer ring (1), the bearing inner ring (2), the rolling bodies (3) and the retainer (4) are independently assembled to form a protective bearing body, the bearing outer ring (1) and the bearing inner ring (2) are coaxially arranged, the rolling bodies (3) are arranged between the bearing outer ring (1) and the bearing inner ring (2), and the rolling bodies (3) are separated from each other by the retainer (4).
4. A self-centering protective bearing arrangement for a vertical magnetic bearing system as claimed in claim 1, wherein: the inner diameter d1 of the bearing inner ring (2) is larger than the inner diameter d2 of the matched shaft sleeve (5), namely d1 is larger than d2, and the radial width dimension h2 of the matched shaft sleeve (5) is larger than the radial width h1 of the bearing inner ring (2), namely h1 is smaller than h2.
5. A self-centering protective bearing arrangement for a vertical magnetic bearing system as claimed in claim 1, wherein: the angle range of the matched conical surfaces of the bearing inner ring (2) and the matched shaft sleeve (5) and the horizontal plane is 10-45 degrees.
6. A self-centering protective bearing arrangement for a vertical magnetic bearing system as claimed in claim 1, wherein: the contact conical surfaces of the bearing inner ring (2) and the mating shaft sleeve (5) are provided with wear-resistant materials or coatings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311606995.1A CN117605759A (en) | 2023-11-29 | 2023-11-29 | Self-centering protection bearing device for vertical magnetic suspension bearing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311606995.1A CN117605759A (en) | 2023-11-29 | 2023-11-29 | Self-centering protection bearing device for vertical magnetic suspension bearing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117605759A true CN117605759A (en) | 2024-02-27 |
Family
ID=89943843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311606995.1A Pending CN117605759A (en) | 2023-11-29 | 2023-11-29 | Self-centering protection bearing device for vertical magnetic suspension bearing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117605759A (en) |
-
2023
- 2023-11-29 CN CN202311606995.1A patent/CN117605759A/en active Pending
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