CN107100932B - Axial magnetic suspension bearing, magnetic suspension system and compressor - Google Patents
Axial magnetic suspension bearing, magnetic suspension system and compressor Download PDFInfo
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- CN107100932B CN107100932B CN201710438261.5A CN201710438261A CN107100932B CN 107100932 B CN107100932 B CN 107100932B CN 201710438261 A CN201710438261 A CN 201710438261A CN 107100932 B CN107100932 B CN 107100932B
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- bearing
- protection
- axial
- magnetic suspension
- radial
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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
Abstract
The invention relates to an axial magnetic suspension bearing, a magnetic suspension system and a compressor, and mainly aims to overcome the defect that the conventional axial magnetic suspension bearing can only provide axial protection for the magnetic suspension system. The main technical scheme adopted is as follows: the axial magnetic suspension bearing comprises a stator, a rotor and a first protection structure; the first protection structure comprises a first stopping part and a second stopping part; the first stopping part is arranged on the stator, and the second stopping part is arranged on the rotor; the first stop and the second stop are opposite in both axial and radial directions, and have a first gap for providing axial protection for the axial magnetic suspension bearing in the axial direction and a second gap for providing radial protection for a component sleeved on the rotating shaft in the radial direction. The magnetic suspension system can be protected axially and radially through the arranged first gap and the second gap, the space for additionally arranging the radial protection can be saved, and the design allowance is improved.
Description
Technical Field
The invention relates to the technical field of magnetic suspension, in particular to an axial magnetic suspension bearing, a magnetic suspension system and a compressor.
Background
Generally, the conventional axial magnetic suspension bearing protection structure is shown in fig. 1, and includes a front axial iron core 1', a front axial bearing control coil 2', a front protection bearing 3', a thrust disc 4', a rear protection bearing 5', a rear axial bearing control coil 6', a rear axial bearing iron core 7', and an optical axis 8'. The axial magnetic suspension bearing protection device is mainly characterized in that a limit gap is formed between the right end face of the front protection bearing 3' and the left end face of the thrust disc 4', and between the right end face of the thrust disc 4' and the left end face of the rear protection bearing 5', and a working gap of the axial magnetic suspension bearing is formed among the front axial bearing iron core 1', the thrust disc 4' and the rear axial bearing iron core 7', wherein the limit gap is smaller than the working gap. When the thrust disc rotates to work, the left end face of the thrust disc 4' is in frictional contact with the right end face of the front protection bearing 3', and the right end face of the thrust disc 4' is in frictional contact with the left end face of the rear protection bearing 5', so that the front axial iron core 1' and the rear axial bearing iron core 7' are protected and are not abraded and damaged due to friction with the thrust disc 4 '. The axial magnetic suspension bearing protection structure can only provide axial protection, and a radial protection structure is additionally arranged for realizing the radial protection of a magnetic suspension system. However, in the prior art, the axial protection structure and the radial protection structure of the magnetic levitation system are generally separately arranged on the optical axis 8' at intervals, so that the design space requirement on the magnetic levitation system is high, and the overall design difficulty of the magnetic levitation system is increased.
Disclosure of Invention
In view of this, the present invention provides an axial magnetic suspension bearing, a magnetic suspension system and a compressor, and mainly aims to solve the defect that the existing axial magnetic suspension bearing can only provide axial protection for the magnetic suspension system.
In order to achieve the purpose, the invention mainly provides the following technical scheme:
the embodiment of the invention provides an axial magnetic suspension bearing, which is used for being matched with a rotating shaft, and comprises a stator, a rotor and a first protection structure; the first protection structure comprises a first stopping part and a second stopping part;
the first stopping part is arranged on the stator, and the second stopping part is arranged on the rotor; a first gap H1 for providing axial protection for the axial magnetic suspension bearing and a second gap H2 for providing radial protection for a component sleeved on the rotating shaft are arranged between the first blocking portion and the second blocking portion in the axial direction.
The purpose of the invention and the technical problem to be solved can be further realized by adopting the following technical measures.
In the foregoing axial magnetic suspension bearing, optionally, the rotor includes a thrust disc, the stator includes two bearing cores, and the two bearing cores are distributed on two sides of the thrust disc;
the first protection structure is arranged between the thrust disc and at least one bearing iron core.
In the foregoing axial magnetic suspension bearing, optionally, the first stopping portion includes a first protective bearing, and the first protective bearing is fixedly sleeved in a shaft hole of one bearing core;
the second stopper portion includes a stepped structure provided on a first side of the thrust disk, the first side of the thrust disk being opposite to the one bearing core, the stepped structure including a first face extending in the radial direction and a second face extending in the axial direction;
the first surface is opposite to the end surface of the first end of the first protection bearing, and the first gap is formed between the first surface and the end surface of the first end of the first protection bearing, wherein the first end is the end of the first protection bearing close to the thrust disc; and/or the second surface is opposite to the inner wall of the shaft hole of the first protection bearing, and the second gap is formed between the second surface and the inner wall of the shaft hole of the first protection bearing.
In the foregoing axial magnetic suspension bearing, optionally, the shaft hole of the bearing core is close to one end of the thrust disc, and a first annular flaring groove is formed in the end of the shaft hole, the first protective bearing is sleeved in the first flaring groove, and the first end protrudes out of the first flaring groove.
In the foregoing axial magnetic suspension bearing, optionally, the first side of the thrust disc has a third surface that is opposite to the one bearing core and forms a working gap therebetween;
and the stepped structure protrudes out of the third surface along the axial direction.
In the foregoing axial magnetic suspension bearing, optionally, an annular second flared groove is provided at an end of the shaft hole of one bearing core close to the thrust disc, and the first stopping portion includes the second flared groove;
the second stopper portion comprises a protective ring disposed on a first side of the thrust disc opposite the one bearing core;
the end surface of one end of the protection ring, which is opposite to the thrust disc, is opposite to the bottom surface of the second flaring groove, and a first gap is formed between the end surface of the protection ring and the bottom surface of the second flaring groove; and/or a side surface of the guard ring is opposite to a side surface of the second flared groove, and the second gap is formed between the side surface of the guard ring and the side surface of the second flared groove.
In the aforementioned axial magnetic bearing, the protection ring is optionally made of a wear-resistant material.
In another aspect, embodiments of the present invention further provide a magnetic levitation system, which includes any one of the axial magnetic levitation bearings described above.
In the foregoing magnetic levitation system, optionally, the magnetic levitation system further includes a second protection structure for providing radial protection to a component sleeved on the rotating shaft.
In the foregoing magnetic levitation system, optionally, the magnetic levitation system further includes a radial magnetic levitation device disposed on one side of the axial magnetic levitation bearing;
the second protection structure is arranged on the radial magnetic suspension bearing
In the foregoing magnetic levitation system, optionally, the radial magnetic levitation device includes a radial magnetic levitation bearing and a bearing housing;
the bearing shell is provided with a shaft hole, one end of the shaft hole of the bearing shell is provided with a third flaring groove in an annular shape, and the radial magnetic suspension bearing is sleeved in the third flaring groove;
the second protection structure comprises a second protection bearing, and the second protection bearing is sleeved in the shaft hole of the bearing shell;
the pivot passes the shaft hole of second protection bearing, and with form the third clearance between the inner wall in the shaft hole of second protection bearing, the third clearance is used for establishing the cover and is changeing epaxial part and provide radial protection.
In another aspect, an embodiment of the present invention further provides a compressor, which includes any one of the magnetic levitation systems described above.
By means of the technical scheme, the axial magnetic suspension bearing, the magnetic suspension system and the compressor at least have the following beneficial effects:
in the technical scheme provided by the invention, because a first gap for providing axial protection for the axial magnetic suspension bearing and a second gap for providing radial protection for a part sleeved on the rotating shaft are arranged between the first stopping part and the second stopping part in the axial direction, the axial protection can be provided for the magnetic suspension system through the arranged first gap and the second gap, and the radial protection can also be provided, so that the practicability of the axial magnetic suspension bearing is enhanced; in addition, the space for additionally arranging radial protection can be saved, and the design allowance is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to make the technical solutions of the present invention practical in accordance with the contents of the specification, the following detailed description is given of preferred embodiments of the present invention with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of an axial magnetic suspension bearing and a rotating shaft assembly in the prior art;
FIG. 2 is a schematic structural diagram of an axial magnetic bearing assembled with a rotating shaft according to an embodiment of the present invention;
FIG. 3 is an enlarged schematic view of the structure at A in FIG. 2;
FIG. 4 is a schematic structural diagram of an axial magnetic suspension bearing and a rotating shaft assembly provided by an embodiment of the invention;
FIG. 5 is an enlarged schematic view of the structure at B in FIG. 4;
FIG. 6 is a schematic diagram of a magnetic levitation system according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another magnetic levitation system provided by an embodiment of the invention.
Reference numerals: 1. a stator; 10. an axial magnetic suspension bearing; 11. a front axial bearing core; 100. a magnetic suspension system; 111. a first flared slot; 112. a second flared slot; 12. a rear axial bearing core; 2. a rotor; 20. a rotating shaft; 21. a thrust disc; 211. a third surface; 3. a first protective structure; 30. a radial magnetic suspension device; 31. a first stopper portion; 311. a first protective bearing; 3111. a first end; 3112. the inner wall of the shaft hole of the first protection bearing; 32. a second stopper portion; 321. a stepped structure; 3211. a first side; 3212. a second face; 322. a guard ring; 3221. the end face of one end of the protection ring, which is opposite to the thrust disc; 3222. a side surface of the guard ring; 4. a radial magnetic suspension bearing; 5. a bearing housing; 51. a shaft hole of the bearing housing; 511. a third flared slot; 6. a second protective bearing; 7. a bearing pressure plate; 8. a front axial bearing control coil; 9. the rear axial bearing controls the coil.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined object, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
As shown in fig. 2 and 4, an axial magnetic suspension bearing 10 according to an embodiment of the present invention is provided, wherein the axial magnetic suspension bearing 10 is used for cooperating with a rotating shaft 20. Specifically, the axial magnetic suspension bearing 10 is configured to be sleeved on the rotating shaft 20. The axial magnetic bearing 10 of the invention comprises a stator 1, a rotor 2 and a first protective structure 3. The first protection configuration 3 comprises a first stop 31 and a second stop 32.
The first stopper portion 31 is provided on the stator 1, and the second stopper portion 32 is provided on the rotor 2. Between the first stop 31 and the second stop 32, there are a first gap H1 in the axial direction for providing axial protection to the axial magnetic bearing 10 and a second gap H2 in the radial direction for providing radial protection to the component mounted on the rotating shaft 20 (see fig. 3 and 5). Here, it should be noted that: here, the "component" not only fits on the rotating shaft 20, but also has a gap with the rotating shaft 20, for example, the component may be the stator 1 of a bearing magnetic suspension bearing, a radial magnetic suspension bearing, or the stator of an electric motor.
The first gap H1 is a gap for providing axial protection to the axial magnetic suspension bearing 10, and therefore the first gap H1 is smaller than the working gap H of the axial magnetic suspension bearing 10. Similarly, the second gap H2 is smaller than the gap between the component and the rotating shaft 20, since the second gap H2 is a gap for providing radial protection to the component sleeved on the rotating shaft 20. When there are a plurality of the above-mentioned components, for example, the second gap H2 is to simultaneously protect the stator 1 of the bearing magnetic bearing, the radial magnetic bearing and the stator of the motor, the second gap H2 is smaller than the gaps between all these components and the rotating shaft 20.
In the technical scheme provided above, the first gap H1 and the second gap H2 can provide axial protection and radial protection for the magnetic suspension system, so that the practicability of the axial magnetic suspension bearing 10 of the present invention is enhanced; in addition, the space for additionally arranging radial protection can be saved, and the design allowance is improved.
As shown in fig. 3 and 5, the rotor 2 described above may include a thrust disc 21. The stator 1 may include a bearing core. The number of the bearing cores is two, and the bearing cores are distributed on both sides of the thrust disk 21. Wherein the first protection structure 3 is arranged between the thrust disc 21 and the at least one bearing core. Preferably, the first protection structure 3 is provided between the thrust disc 21 and both bearing cores.
The two bearing cores may be a front axial bearing core 11 and a rear axial bearing core 12, respectively. Wherein the aforementioned first protection structure 3 is provided between the thrust disc 21 and the front axial bearing core 11 and/or the rear axial bearing core 12.
In order to form the aforementioned first gap H1 and second gap H2, the following scheme may be adopted in the embodiment of the present invention: in one example, as shown in fig. 3, the first blocking portion 31 includes a first protection bearing 311, and the first protection bearing 311 is fixedly sleeved in a shaft hole of a bearing core. The one bearing core is a front axial bearing core 11 or a rear axial bearing core 12.
For convenience of description, the first protection structure 3 is specifically exemplified below between the thrust disc 21 and the front axial bearing core 11: in the first example, as shown in fig. 3, the first protection bearing 311 is fitted in the shaft hole of the front axial bearing core 11. The second stopper 32 comprises a step structure 321, the step structure 321 being arranged on a first side of the thrust disc 21. The first side of the thrust disc 21 is opposite to the front axial bearing core 11 described above. The stepped structure 321 includes a first face 3211 extending in a radial direction and a second face 3212 extending in an axial direction. The term "radial" herein refers to a radial direction of the magnetic bearing 10 in the axial direction, and similarly, the term "axial" herein refers to an axial direction of the magnetic bearing 10 in the axial direction.
The first surface 3211 may face an end surface of the first end 3111 of the first protection bearing 311, and form the first gap H1 therebetween. The first end 3111 is an end of the first protection bearing 311 near the thrust disc 21.
The second surface 3212 may face the shaft hole inner wall 3112 of the first protection bearing 311, and form the aforementioned second gap H2 therebetween.
In the above example, the first gap H1 and the second gap H2 can be formed by the cooperation of the first protection bearing 311 and the stepped structure 321, and the structure is relatively simple and convenient to implement.
Further, as shown in fig. 3, the shaft hole of the front axial bearing core 11 is provided with a first annular flared groove 111 at one end close to the thrust plate 21. The first protection bearing 311 is disposed in the first slot 111, and the first end 3111 protrudes from the first slot 111 to protect the front axial bearing core 11 from contacting the thrust plate 21.
Further, as shown in fig. 3, the first side of the thrust disk 21 has a third surface 211 facing the front axial bearing core 11 and forming a working gap H therebetween. The stepped structure 321 protrudes from the third surface 211 in the axial direction of the axial magnetic suspension bearing 10 to protect the thrust disk 21, so that the thrust disk 21 does not contact with the one bearing core.
Here, it should be noted that: as shown in fig. 2, the first protection structure 3 may be provided between the thrust disk 21 and the rear axial bearing core 12. The specific structure and implementation manner of the first protection structure 3 between the thrust disc 21 and the front axial bearing core 11 in the first example can be referred to in the corresponding description above, and details are not described herein again.
In order to form the first gap H1 and the second gap H2, the following scheme may be adopted in the implementation of the present invention: in another example, as shown in fig. 4 and 5, the shaft hole of one bearing core is provided with a second flared groove 112 having a ring shape at an end near the thrust disk 21. The one bearing core is a front axial bearing core 11 or a rear axial bearing core 12. The first stopper portion 31 includes the second flared groove 112.
For convenience of description, the first protection structure 3 is specifically exemplified below between the thrust disc 21 and the front axial bearing core 11: in the second example, as shown in fig. 5, the shaft hole of the front axial bearing core 11 is provided with a second flared groove 112 having a ring shape at one end near the thrust disk 21. The aforementioned second stopper portion 32 includes a protection ring 322, and the protection ring 322 is disposed on a first side of the thrust disk 21, the first side of the thrust disk 21 being opposite to the front axial bearing core 11.
An end surface 3221 of the protection ring 322 at the end opposite to the thrust disc 21 may be opposite to the bottom surface of the second flared groove 112, and the aforementioned first gap H1 may be formed therebetween.
A side 3222 of the protection ring 322 may be opposite to the side of the second flared groove 112, and the aforementioned second gap H2 may be formed therebetween. Here, it should be noted that: since the protection ring 322 is annular, the side 3222 of the protection ring 322 refers to an outer cylindrical surface of the protection ring 322.
In the second example, the first gap H1 and the second gap H2 can be formed by the engagement of the second flared groove 112 and the protection ring 322, and the structure is relatively simple and convenient to implement.
Further, the protection ring 322 may be made of a wear-resistant material such as graphite or babbitt metal, so as to improve the service life of the protection ring 322.
Here, it should be noted that: as shown in fig. 4, the first protection structure 3 may be provided between the thrust disk 21 and the rear axial bearing core 12. The specific structure and implementation manner of the first protection structure 3 between the thrust disc 21 and the front axial bearing core 11 in the second example can be referred to in the corresponding description above, and details are not described herein again.
On the other hand, as shown in fig. 6 and 7, an embodiment of the present invention further provides a magnetic levitation system 100 including the axial magnetic bearing 10 in any of the above examples. Due to the arrangement of the axial magnetic bearing 10, it can provide protection both for the axial direction and for the radial direction; in addition, the space for additionally arranging radial protection can be saved, and the design allowance is improved.
Further, as shown in fig. 6 and 7, the magnetic levitation system 100 of the present invention further includes a second protection structure for providing radial protection to the components mounted on the rotating shaft 20. The second protection structure is matched with the first protection structure 3, so that double-layer radial protection of a high bearing end is realized, and the reliability of the magnetic suspension system 100 is improved.
Further, as shown in fig. 6 and 7, the magnetic levitation system 100 of the present invention further includes a radial magnetic levitation device 30 disposed at one side of the axial magnetic levitation bearing 10. The aforementioned second protection structure is arranged on the radial magnetic bearing 30.
Preferably, the aforementioned radial magnetic levitation device 30 may comprise a radial magnetic levitation bearing 4 and a bearing housing 5. The bearing housing 5 has a shaft hole 51. One end of the shaft hole 51 of the bearing housing 5 is provided with a third annular expansion groove 511. The radial magnetic bearing 4 is sleeved in the third flared groove 511. The second protection structure comprises a second protection bearing 6, and the second protection bearing 6 is sleeved in the shaft hole 51 of the bearing housing 5. The rotating shaft 20 passes through the shaft hole of the second protective bearing 6 and forms a third gap H3 with the inner wall of the shaft hole of the second protective bearing 6, and the third gap H3 is used for providing radial protection for a component sleeved on the rotating shaft 20. In particular, the third gap H3 is smaller than the working gap H4 of the radial magnetic bearing 4.
Further, as shown in fig. 6 and 7, the number of the second protective bearings 6 may be at least two to improve the reliability of the radial protection.
As shown in fig. 6 and 7, the aforementioned radial magnetic levitation device 30 may further include a bearing pressure plate 7, wherein the bearing pressure plate 7 is used for pressing against the second protective bearing 6 to prevent the second protective bearing 6 from being released from the shaft hole 51 of the bearing housing 5.
In a specific application example, the number of the radial magnetic suspension devices 30 is two, and the second protection structure is provided on each radial magnetic suspension device 30.
In another aspect, an embodiment of the present invention further provides a compressor, which includes the magnetic levitation system 100 in any one of the above embodiments. Due to the arrangement of the magnetic levitation system 100, the magnetic levitation system 100 comprises the axial magnetic levitation bearing 10, which can provide protection for both the axial direction and the radial direction; in addition, the space for additionally arranging radial protection can be saved, and the design allowance is improved.
The working principle and preferred embodiments of the present invention are described below.
In a first embodiment, as shown in fig. 2 and 3, a magnetic levitation system 100 is applied to a magnetic levitation product, and includes a front axial bearing core 11, a front axial bearing control coil 8, a front protection bearing (i.e. a first protection bearing 311), a thrust disc 21, a rear protection bearing (i.e. a first protection bearing 311), a rear axial bearing control coil 9, a rear axial bearing core 12, and a rotating shaft 20. The rotating shaft 20 may be an optical axis. When the axial magnetic suspension bearing 10 works, an axial working gap of the axial magnetic suspension bearing 10 is formed among the front axial bearing iron core 11, the thrust disc 21 and the rear axial bearing iron core 12, and magnetic pull force required by the operation of the axial magnetic suspension bearing 10 is provided. Axial protection gaps are formed in the axial direction of the step surfaces of the front protection bearing, the rear protection bearing and the thrust disc 21, namely the first gap H1, and the first gap H1 is required to be smaller than the axial working gap H, so that the axial protection effect on the axial magnetic suspension bearing 10 is achieved. When the magnetic suspension system 100 is assembled, a radial gap is formed between the rotating shaft 20 and each component, and a radial protective gap, i.e., the aforementioned second gap H2, is formed in the radial direction of the step surfaces of the front protective bearing, the rear protective bearing, and the thrust disc 21, thereby playing a role in radial protection of the magnetic suspension system 100. In the invention, the structure of the thrust disc 21 is changed, so that the axial magnetic suspension bearing 10 realizes the radial protection of the magnetic suspension system 100 while providing the axial protection, the space for additionally arranging the radial protection is saved, and the design margin is improved.
In a second embodiment, as shown in fig. 4 and 5, a magnetic levitation system 100 is applied to a magnetic levitation product, and includes a front axial bearing core 11, a front axial bearing control coil 8, a front axial protection ring 322, a thrust disk 21, a rear axial protection ring 322, a rear axial bearing control coil 9, a rear axial bearing core 12, and a rotating shaft 20. The rotating shaft 20 may be an optical axis, etc. When the axial magnetic suspension bearing 10 works, a working gap of the axial magnetic suspension bearing 10 is formed among the front axial bearing iron core 11, the thrust disc 21 and the rear axial bearing iron core 12, and magnetic pull force required by the axial magnetic suspension bearing 10 is provided. The front axial protection ring 322 and the front axial bearing core 11, and the rear axial protection ring 322 and the rear axial bearing core 12 form an axial protection gap of the axial magnetic suspension bearing 10 in the axial direction, that is, the first gap H1, and the first gap H1 is required to be smaller than the working gap H, so as to play an axial protection role for the axial magnetic suspension bearing 10. When the magnetic levitation system 100 is assembled, radial gaps are formed between the rotating shaft 20 and each component, and radial protection gaps, namely the second gap H2, are formed in the radial directions of the front axial protection ring 322 and the front axial bearing core 11, and the rear axial protection ring 322 and the rear axial bearing core 12, so that the magnetic levitation system 100 is radially protected. In the invention, the front and rear axial protection rings 322 are added on the rotor 2, and the front and rear axial protection rings 322 are made of wear-resistant materials such as graphite or Babbitt alloy, so that the axial magnetic suspension bearing 10 realizes radial protection of the magnetic suspension system 100 while providing axial protection, saves the space for additionally arranging the radial protection and improves the design margin.
In a third embodiment, as shown in fig. 6, a magnetic levitation system 100, applied to a magnetic levitation product, includes a front axial bearing core 11, a front axial bearing control coil 8, a front protection bearing (i.e. a first protection bearing 311), a thrust disc 21, a rear protection bearing (i.e. a first protection bearing 311), a rear axial bearing control coil 9, a rear axial bearing core 12, a rotating shaft 20, and the aforementioned radial magnetic levitation device 30. The structure and principle of the axial magnetic suspension bearing 10 in this embodiment are the same as those of the axial magnetic suspension bearing 10 in the first embodiment, and the radial magnetic suspension device 30 with the second protection structure is further adopted, and is matched with the axial magnetic suspension bearing 10 to form secondary radial protection, so that double-layer radial protection at a high bearing end is realized, and the reliability of the magnetic suspension system 100 is improved.
In a fourth embodiment, as shown in fig. 7, a magnetic levitation system 100 is applied to a magnetic levitation product, and includes a front axial bearing core 11, a front axial bearing control coil 8, a front axial protection ring 322, a thrust disc 21, a rear axial protection ring 322, a rear axial bearing control coil 9, a rear axial bearing core 12, a rotating shaft 20, and the aforementioned radial magnetic levitation apparatus 30. The structure and principle of the axial magnetic suspension bearing 10 in this embodiment are the same as those of the axial magnetic suspension bearing 10 in the second embodiment, and the radial magnetic suspension device 30 with the second protection structure is further adopted, and is matched with the axial magnetic suspension bearing 10 to form secondary radial protection, so that double-layer radial protection at a high bearing end is realized, and the reliability of the magnetic suspension system 100 is improved.
According to the above embodiments, the axial magnetic suspension bearing 10, the magnetic suspension system 100 and the compressor of the present invention have at least the following advantages:
generally, magnetic levitation application products are ultra-high speed machines. The magnetic suspension bearing is a key part, and once the magnetic suspension system 100 fails, the magnetic suspension product cannot start suspension and normally operate, so that production loss is caused. Therefore, when designing a magnetic suspension bearing, a corresponding protection component is designed for the magnetic suspension bearing. The axial magnetic suspension bearing 10 of the present invention can simultaneously realize radial and axial protection of the magnetic suspension system 100, save the space for additionally arranging the radial protection, and improve the design margin. Or other radial protection devices are matched to realize double-layer radial protection of a high bearing end, so that the reliability of the magnetic suspension system 100 is improved.
Here, it should be noted that: in the case of no conflict, a person skilled in the art may combine the relevant technical features in the foregoing examples with each other according to an actual situation to achieve a corresponding technical effect, and details of various combining situations are not described herein again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Claims (12)
1. An axial magnetic suspension bearing is used for being matched with a rotating shaft (20) for use, and comprises a stator (1), a rotor (2) and a first protection structure (3); characterized in that said first protection structure (3) comprises a first stop (31) and a second stop (32);
the first stop portion (31) is arranged on the stator (1), and the second stop portion (32) is arranged on the rotor (2); a first clearance H1 for providing axial protection for the axial magnetic suspension bearing and a second clearance H2 for providing radial protection for a component sleeved on the rotating shaft (20) are arranged between the first stopping part (31) and the second stopping part (32) in the axial direction, and the second clearance H2 is smaller than the clearance between the component and the rotating shaft (20).
2. Axial magnetic suspension bearing according to claim 1,
the rotor (2) comprises a thrust disc (21), the stator (1) comprises two bearing cores, and the two bearing cores are distributed on two sides of the thrust disc (21);
wherein the first protection structure (3) is arranged between the thrust disc (21) and at least one bearing iron core.
3. Axial magnetic suspension bearing according to claim 2,
the first stopping portion (31) comprises a first protective bearing (311), and the first protective bearing (311) is fixedly sleeved in a shaft hole of one bearing iron core;
the second stop (32) comprises a stepped structure (321), the stepped structure (321) being arranged on a first side of the thrust disc (21), the first side of the thrust disc (21) being opposite to the one bearing core, the stepped structure (321) comprising a first face (3211) extending in the radial direction and a second face (3212) extending in the axial direction;
wherein the first surface (3211) opposes an end surface of a first end (3111) of the first protective bearing (311) and forms the first gap H1 therebetween, the first end (3111) being an end of the first protective bearing (311) near the thrust disc (21); and/or the second surface (3212) is opposite to the inner wall of the shaft hole of the first protection bearing (311) and forms the second gap H2 therebetween.
4. Axial magnetic suspension bearing according to claim 3,
the shaft hole of a bearing core is being close to the one end of thrust dish (21) is equipped with and is annular first flaring groove (111), first protection bearing (311) cover is established in first flaring groove (111), just first end (3111) protrusion in first flaring groove (111).
5. Axial magnetic bearing according to claim 3 or 4,
the first side of the thrust disc (21) is provided with a third surface (211) which is opposite to the bearing iron core and forms a working gap between the first side and the third side;
wherein the stepped structure (321) protrudes from the third surface (211) along the axial direction.
6. Axial magnetic suspension bearing according to claim 2,
one end of the shaft hole of one bearing iron core, which is close to the thrust disc (21), is provided with a second annular flaring groove (112), and the first stopping part (31) comprises the second flaring groove (112);
the second stop (32) comprises a protection ring (322), the protection ring (322) being arranged on a first side of the thrust disc (21), the first side of the thrust disc (21) being opposite to the one bearing core;
an end surface (3221) of one end of the protection ring (322), which is opposite to the thrust disc (21), is opposite to the bottom surface of the second flaring groove (112), and a first gap H1 is formed between the end surface and the bottom surface; and/or, the side surface (3222) of the protection ring (322) is opposite to the side surface of the second flaring groove (112) and forms the second gap H2 between the two.
7. Axial magnetic suspension bearing according to claim 6,
the protective ring (322) is made of a wear resistant material.
8. Magnetic levitation system, comprising an axial magnetic levitation bearing according to any of claims 1 to 7.
9. Magnetic levitation system according to claim 8, further comprising a second protection structure for providing radial protection to components mounted on the rotating shaft (20).
10. Magnetic levitation system according to claim 9, further comprising radial magnetic levitation means (30) arranged at one side of the axial magnetic levitation bearing;
the second protection structure is arranged on the radial magnetic suspension device (30).
11. Magnetic levitation system according to claim 10,
the radial magnetic suspension device (30) comprises a radial magnetic suspension bearing (4) and a bearing shell (5);
the bearing shell (5) is provided with a shaft hole (51), one end of the shaft hole (51) of the bearing shell (5) is provided with a third annular flaring groove (511), and the radial magnetic suspension bearing (4) is sleeved in the third flaring groove (511);
the second protection structure comprises a second protection bearing (6), and the second protection bearing (6) is sleeved in the shaft hole (51) of the bearing shell (5);
the pivot (20) pass the shaft hole of second protection bearing (6) and with form third clearance H3 between the inner wall in the shaft hole of second protection bearing (6), third clearance H3 is used for establishing the cover and establishes parts on pivot (20) provide radial protection.
12. A compressor, characterized in that it comprises a magnetic levitation system as claimed in any one of claims 8 to 11.
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| CN201710438261.5A CN107100932B (en) | 2017-06-12 | 2017-06-12 | Axial magnetic suspension bearing, magnetic suspension system and compressor |
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| CN201710438261.5A CN107100932B (en) | 2017-06-12 | 2017-06-12 | Axial magnetic suspension bearing, magnetic suspension system and compressor |
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| CN107100932B true CN107100932B (en) | 2023-01-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107588111A (en) * | 2017-10-30 | 2018-01-16 | 南京磁谷科技有限公司 | A kind of thrust disc structure of magnetic suspension rotor |
| CN109058291A (en) * | 2018-08-06 | 2018-12-21 | 珠海格力电器股份有限公司 | Magnetic bearing structure and magnetic suspension motor |
| CN109763994A (en) * | 2019-02-21 | 2019-05-17 | 珠海格力电器股份有限公司 | Magnetic suspension bearing and magnetic suspension centrifugal compressor, air conditioner |
| CN111089115A (en) * | 2020-01-07 | 2020-05-01 | 珠海格力电器股份有限公司 | Axial protection system for magnetic suspension bearing |
| CN113700744B (en) * | 2021-09-23 | 2022-11-25 | 珠海格力电器股份有限公司 | Magnetic suspension bearing, compressor and air conditioner |
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| DE4421990A1 (en) * | 1994-06-23 | 1996-01-04 | Abb Research Ltd | Pressure wave machine with integrated combustion |
| JPH08232955A (en) * | 1995-02-27 | 1996-09-10 | Ebara Corp | Magnetic bearing |
| JP2003199288A (en) * | 2001-12-28 | 2003-07-11 | Sankyo Seiki Mfg Co Ltd | Magnetically levitated motor and magnetic bearing device |
| JP2003269452A (en) * | 2002-03-15 | 2003-09-25 | Koyo Seiko Co Ltd | Magnetic bearing device |
| CN201335095Y (en) * | 2009-01-09 | 2009-10-28 | 徐向明 | Rolling bearing with sensor |
| CN101771308B (en) * | 2009-04-26 | 2015-12-16 | 张玉宝 | A kind of magnetic suspension rotor support system and magnetic suspension bearing and magnetic bias weight reducing device |
| JP2012087861A (en) * | 2010-10-19 | 2012-05-10 | Nippon Densan Corp | Fluid dynamic bearing mechanism, spindle motor and disk drive apparatus |
| DE102011013692B4 (en) * | 2011-03-11 | 2015-06-18 | Voith Patent Gmbh | Bearing arrangement for receiving the axial thrust of a shaft |
| JP5773715B2 (en) * | 2011-04-07 | 2015-09-02 | 東京パーツ工業株式会社 | Spindle motor |
| JP2012257428A (en) * | 2011-06-10 | 2012-12-27 | Nippon Densan Corp | Motor and disk drive |
| CN105570300B (en) * | 2016-03-16 | 2018-01-02 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of axial magnetic suspension bearing |
| CN205446400U (en) * | 2016-03-31 | 2016-08-10 | 珠海格力节能环保制冷技术研究中心有限公司 | Magnetic suspension bearing subassembly and compressor |
| CN105840430A (en) * | 2016-06-01 | 2016-08-10 | 河南理工大学 | Small vertical shaft magnetic suspension wind driven generator |
| CN206918077U (en) * | 2017-06-12 | 2018-01-23 | 珠海格力节能环保制冷技术研究中心有限公司 | Axial magnetic suspension bearing, magnetic suspension system and compressor |
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