Magnetic suspension bearing rotor, magnetic suspension bearing and rotating shaft assembly

Abstract

The utility model provides a magnetic suspension bearing rotor, a magnetic suspension bearing and a rotating shaft assembly, the magnetic suspension bearing rotor comprises a lining, the outer circumferential wall of the lining is sequentially provided with a front baffle ring, a rear baffle ring and a rotor core clamped between the front baffle ring and the rear baffle ring along the axial direction of the lining, the rotor core and the bushing are in transition fit or clearance fit, and at least one of the front baffle ring and the rear baffle ring is in threaded connection with the bushing. According to the utility model, the rotor iron core does not need to be heated and sleeved, so that the manufacturability and the benefit can be effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of magnetic levitation bearing design, and particularly relates to a magnetic levitation bearing rotor, a magnetic levitation bearing and a rotating shaft assembly. Background Art

[0002] A magnetic levitation bearing is an electromagnetic bearing applied to a magnetic levitation motor, which can provide a levitation force to suspend the motor rotor in the air to achieve the effect of no mechanical friction, and can effectively improve the motor efficiency and speed. The magnetic levitation bearing is mainly divided into two parts: a stator and a rotor. Among them, the stator is generally matched with the motor housing, and the rotor is matched with the motor rotor. A known existing structure of a radial magnetic levitation bearing rotor (as Figure 1 shown) includes: a front retaining ring, a punching sheet, a rear retaining ring, and a bushing.

[0003] Currently, in the manufacturing process of the radial magnetic levitation bearing rotor, the machined front retaining ring, rear retaining ring, bushing, and the stamping-formed punching sheet are first prepared. Then, a stacking tooling is used to press them in the order of the front retaining ring → punching sheet → rear retaining ring. Next, the whole stacking tooling is put into an oven for heating once, and then the bushing is hot-fitted into the stacking tooling and cooled to form. Finally, after the inner circle of the radial bearing rotor is precision turned, the whole is heated again and hot-fitted onto the rotor shaft.

[0004] In the existing assembly process of the radial magnetic levitation bearing rotor, the bearing rotor needs to go through two rounds of heating and hot-fitting processes. The disadvantages of this assembly method are poor processability and poor efficiency. The processability is poor because there are two hot-fittings in total, and the front and rear retaining rings, bushing, and punching sheet have different thermal expansion coefficients. Multiple hot-fittings will cause gaps between the front and rear retaining rings and the punching sheet (as Figure 2 shown), which greatly affects the reliability of the radial magnetic levitation bearing rotor. The poor efficiency is due to the fact that the existing radial magnetic levitation bearing rotor needs to go through two hot-fittings, and after each hot-fitting, it needs to be naturally cooled to room temperature before the next operation can be carried out, which greatly increases the assembly time. Moreover, once gaps appear during multiple hot-fittings, the entire bearing rotor needs to be turned off and reprocessed and hot-fitted, which seriously increases the labor and time costs. Summary of the Utility Model

[0005] Therefore, the utility model provides a magnetic levitation bearing rotor, a magnetic levitation bearing and a rotating shaft assembly, which can solve the technical problems in the prior art that when the rotor core and the bushing in the magnetic levitation bearing rotor adopt a hot-fitting process, secondary hot-fitting is extremely likely to generate assembly gaps during the assembly of the rotor assembly and the rotating shaft, and there is a high possibility of reprocessing and hot-fitting, resulting in high labor and time costs.

[0006] To solve the above problems, the present utility model provides a magnetic levitation bearing rotor, which includes a bushing. Along the axial direction of the outer circumferential wall of the bushing, a front retaining ring, a rear retaining ring, and a rotor core clamped between the front retaining ring and the rear retaining ring are sequentially provided. Among them, an interference fit or a clearance fit is provided between the rotor core and the bushing, and at least one of the front retaining ring and the rear retaining ring is threadedly connected to the bushing.

[0007] In some embodiments, the front retaining ring and the bushing are of an integral structure; and / or, internal threads are formed on the inner wall of the tube of the bushing, and the helix direction of the internal threads is the same as that of the rotating shaft assembled in a matching manner.

[0008] In some embodiments, one end of the bushing away from the front retaining ring is a core assembly end. External threads are formed on the outer circumferential wall of the core assembly end, and the maximum outer diameter of the external threads is smaller than the outer diameter of the fitting section of the bushing assembled with the rotor core. The rear retaining ring is threadedly connected to the external threads.

[0009] In some embodiments, a plurality of positioning posts are provided on the fitting section. Each positioning post extends along the axial direction of the bushing and is arranged at intervals along the circumferential direction of the bushing. Positioning grooves that are arranged in one-to-one correspondence with the positioning posts are provided on the inner ring wall surface of the rotor core. Each positioning groove extends along the axial direction of the rotor core and penetrates both end faces thereof.

[0010] In some embodiments, a convex ring is formed on the end face of the rear retaining ring facing the front retaining ring. The inner ring wall diameter of the convex ring is not less than the outer diameter of the fitting section. In a state where the magnetic levitation bearing rotor is in use, the free end face of the convex ring can abut against the end face of the rotor core.

[0011] In some embodiments, an axial interval is formed between the end face of each positioning post close to the rear retaining ring side and one end of the external threads close to the front retaining ring side, and the stacking thickness of the rotor core is greater than the length of each positioning post.

[0012] The present utility model also provides a magnetic levitation bearing, which includes the above-mentioned magnetic levitation bearing rotor.

[0013] The present utility model also provides a rotating shaft assembly, which includes the above-mentioned magnetic levitation bearing rotor and a rotating shaft. The bushing is threadedly connected to the rotating shaft, and the rear retaining ring is abutted and connected to the shoulder end face of the rotating shaft.

[0014] The present utility model also provides an assembly method of the rotating shaft assembly as described above, which includes the following steps:

[0015] Process and form each punching piece for stacking to form the rotor core, the rear retaining ring, and integrally form the bushing and the front retaining ring;

[0016] Successively sleeved each of the punching pieces on the mating section of the bushing;

[0017] Thread the rear retaining ring with the bushing to form the clamping of the front retaining ring and the rear retaining ring on the rotor core, and the formed assembly is the magnetic levitation bearing rotor;

[0018] Face the rear retaining ring to the shoulder side of the rotating shaft, and thread the magnetic levitation bearing rotor with the rotating shaft through the bushing it has.

[0019] In some embodiments, during the process of successively sleeving each of the punching pieces on the mating section of the bushing, the stacking thickness of the rotor core is L. Among them, the number of positioning grooves of the rotor core is N. After sleeving the punching pieces with a thickness of L / N, rotate the subsequent punching pieces to be sleeved by an angle of 2π / N and then continue to sleeve. L = n·d, where n is the number of punching pieces and is an integer multiple of N, and d is the thickness of each punching piece.

[0020] A magnetic levitation bearing rotor, a magnetic levitation bearing, and a rotating shaft assembly provided by the present utility model have the following

[0021] Beneficial effects:

[0022] In the magnetic levitation bearing rotor, the rotor core no longer adopts the hot sleeve process of the prior art, but is sleeved on the radial outer side of the bushing by interference fit or clearance fit. The axial ends of the rotor core are respectively clamped by the front retaining ring and the rear retaining ring to realize the locking of the axial position of the rotor core. Since at least one of the front retaining ring or the rear retaining ring is threadedly connected to the bushing, the axial clamping force on the rotor core can be ensured by the screwing torque. When it is hot sleeved on the rotating shaft, there will be no gaps formed between the two ends of the rotor core and the front retaining ring and / or the rear retaining ring due to the reheating of the bearing rotor, ensuring the assembly quality. At the same time, since there is no need to heat and sleeve the rotor core, the processability and efficiency can be effectively improved;

[0023] Realize the threaded connection between the magnetic levitation bearing rotor and the rotating shaft through the bushing, without adopting the hot sleeve process between the bushing of the bearing rotor and the rotating shaft in the prior art, further simplifying the assembly process between the bearing rotating shaft and the rotating shaft. Since there is no need to heat the assembled bearing rotor, that is, there is no hot sleeve heating step in the entire assembly of the magnetic levitation bearing rotor and its assembly with the rotating shaft. Therefore, the possibility of gaps generated between the rotor core and adjacent components, namely the aforementioned bushing, front retaining ring, and rear retaining ring, due to different linear expansion rates of materials during the heating process is completely eliminated;

[0024] Setting a plurality of positioning posts on the mating section of the bushing and the rotor core can limit the circumferential displacement of the rotor core, ensure the rotational synchronism between the rotor core and the rotating shaft, and further ensure the service performance of the magnetic levitation bearing.

[0025] By providing a convex ring on the side of the rear retaining ring facing the rotor core, the convex ring can be used to apply a force along the axial direction of the rotor core, thereby ensuring the reliable locking of the axial position of the rear retaining ring to the rotor core.

[0026] The axial extension length of the positioning post does not penetrate the entire length of the mating section, but instead leaves an axial gap, so that it is not necessary to modify the structure of the aforementioned convex ring for the positioning post, simplifying the structural design of the rear retaining ring. Description of the Drawings

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. The drawings in the following description are merely exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can be obtained based on the provided drawings.

[0028] Figure 1 is a schematic structural diagram of the components of a magnetic levitation bearing rotor in the prior art;

[0029] Figure 2 is a schematic structural diagram of a rotating shaft assembly formed by thermally sleeving a magnetic levitation bearing rotor on a rotating shaft in the prior art;

[0030] Figure 3 is a schematic structural diagram of the components of a magnetic levitation bearing rotor according to an embodiment of the present invention;

[0031] Figure 4 is Figure 3 a three-dimensional schematic diagram of the integrated structure of the bushing and the front retaining ring in;

[0032] Figure 5 is Figure 4 the front view of;

[0033] Figure 6 is Figure 5 the left view of;

[0034] Figure 7 is Figure 3 the front view of the rotor core in;

[0035] Figure 8 is Figure 3 the cross-sectional view of the front retaining ring in;

[0036] Figure 9It is a schematic structural diagram of a rotating shaft assembly formed by screwing a magnetic levitation bearing rotor of an embodiment of the present utility model onto a rotating shaft.

[0037] The reference signs are as follows:

[0038] 1. Bushing; 11. Positioning post; 12. Internal thread; 13. External thread; 2. Front retaining ring; 3. Rotor core; 31. Positioning groove; 4. Rear retaining ring; 41. Convex ring; 100. Rotating shaft. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0040] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as limiting the scope of protection of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0041] For the convenience of description, spatial relative terms such as "above...", "above...", "on the upper surface of...", "above" etc. can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the accompanying drawing is inverted, the device described as "above other devices or structures" or "above other devices or structures" will then be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above..." can include both the orientation of "above..." and "below...". The device can also be positioned in other different ways (rotated 90° or in other orientations), and corresponding explanations are made for the spatial relative descriptions used here.

[0042] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without additional statements, the above terms have no special meaning, so it cannot be understood as a limitation on the protection scope of the present utility model.

[0043] Referring to Figure 3 and Figure 9 As shown, according to an embodiment of the present utility model, a magnetic levitation bearing rotor is provided, including a bushing 1. Along the axial direction of the outer circumferential wall of the bushing 1, a front retaining ring 2, a rear retaining ring 4, and a rotor core 3 clamped between the front retaining ring 2 and the rear retaining ring 4 are sequentially provided. Among them, a transition fit or a clearance fit is provided between the rotor core 3 and the bushing 1, and at least one of the front retaining ring 2 and the rear retaining ring 4 is threadedly connected to the bushing 1. It can be understood that the aforementioned rotor core 3 is formed by laminating multiple punched sheets.

[0044] In this technical solution, the rotor core 3 in the magnetic levitation bearing rotor no longer adopts the hot sleeve process of the prior art, but is sleeved on the radial outer side of the bushing 1 by a transition fit or a clearance fit. The axial positions of both ends of the rotor core 3 are respectively clamped by the front retaining ring 2 and the rear retaining ring 4 to realize the locking of the axial position of the rotor core 3. Since at least one of the front retaining ring 2 or the rear retaining ring 4 is threadedly connected to the bushing 1, the axial clamping force on the rotor core 3 can be ensured by the screwing torque. When it is hot-sleeved on the rotating shaft 100, no gap will be formed between the two ends of the rotor core 3 and the front retaining ring 2 and / or the rear retaining ring 4 due to reheating the bearing rotor, ensuring the assembly quality. At the same time, since it is no longer necessary to heat and sleeve the rotor core 3, the processability and efficiency can be effectively improved.

[0045] Preferably, the aforementioned rotor core 3 is assembled with the bushing 1 in a transition fit manner to ensure the position reliability of the rotor core 3 during rotation.

[0046] In some embodiments, of course, both the aforementioned front retaining ring 2 and the rear retaining ring 4 can be connected to the bushing 1 in a threaded connection manner. In a preferred embodiment, the front retaining ring 2 and the bushing 1 are of an integral structure, that is, only the rear retaining ring 4 is threadedly connected to the bushing 1. In this way, on the premise of ensuring the assembly between the rotor core 3 and the bushing 1, the assembly process of each component can be simplified, and the assembly efficiency can be further improved.

[0047] In a preferred embodiment, internal threads 12 are formed on the inner wall of the tube of the bushing 1. It can be understood that external threads matching the aforementioned internal threads 12 are also formed on the corresponding rotating shaft 100. In this way, the threaded connection between the magnetic levitation bearing rotor and the rotating shaft 100 through the bushing 1 is realized, without the need to adopt the shrink-fitting process between the bushing and the rotating shaft of the bearing rotor in the prior art, further simplifying the assembly process between the bearing rotating shaft and the rotating shaft. Since there is no need to heat the assembled bearing rotor, that is, during the assembly of the entire magnetic levitation bearing rotor and its assembly with the rotating shaft 100, there is no shrink-fitting heating step involved. Therefore, the possibility of gaps between the rotor core 3 and adjacent components, namely the aforementioned bushing 1, front retaining ring 2, and rear retaining ring 4, caused by different linear expansion rates of materials during the heating process is completely eliminated.

[0048] In a preferred embodiment, the helix direction of the internal threads 12 is the same as that of the rotating shaft 100 assembled with it to ensure the reliable stability of the threaded connection between the bushing 1 and the rotating shaft 100 during the rotation of the rotating shaft.

[0049] In some embodiments, one end of the bushing 1 away from the front retaining ring 2 is the core assembly end. External threads 13 are formed on the outer circumferential wall of the core assembly end, and the maximum outer diameter of the external threads 13 is smaller than the outer diameter of the fitting section of the bushing 1 assembled with the rotor core 3. The rear retaining ring 4 is threadedly connected to the external threads 13.

[0050] In this technical solution, the maximum outer diameter of the external threads 13 is smaller than the outer diameter of the fitting section of the bushing 1 and the rotor core 3, so as to ensure seamless assembly between the rotor core 3 and the fitting section.

[0051] Specifically refer to Figures 4 to 6 As shown, in some embodiments, a plurality of positioning posts 11 are provided on the fitting section. Each of the positioning posts 11 extends along the axial direction of the bushing 1 and is arranged at intervals along the circumferential direction of the bushing 1. Positioning grooves 31 that are respectively and correspondingly arranged are formed on the inner circumferential wall surface of the rotor core 3. Each of the positioning grooves 31 extends along the axial direction of the rotor core 3 and penetrates both end faces thereof. In a specific embodiment, the cross-section of the aforementioned positioning posts 11 is semi-circular. Correspondingly, the cross-section of each of the positioning grooves 31 is also semi-circular.

[0052] In this technical solution, providing a plurality of positioning posts 11 on the fitting section of the bushing 1 and the rotor core 3 can limit the circumferential displacement of the rotor core 3, ensure the rotational synchronism between the rotor core 3 and the rotating shaft 100, and further ensure the service performance of the magnetic levitation bearing.

[0053] As a specific embodiment, the plurality of positioning posts 11 are arranged at equal intervals along the circumferential direction of the fitting section.

[0054] Specifically, refer to Figure 3 and Figure 8 As shown, in some embodiments, a convex ring 41 is formed on one end face of the rear retaining ring 4 facing the front retaining ring 2. The inner wall diameter of the convex ring 41 is not less than the outer diameter of the fitting section. When the magnetic levitation bearing rotor is in use, the free end face of the convex ring 41 can abut against the end face of the rotor core 3.

[0055] In this technical solution, by providing a convex ring 41 on one side of the rear retaining ring 4 facing the rotor core 3, the convex ring 41 can be used to apply a force along the axial direction of the rotor core 3, ensuring reliable locking of the axial position of the rear retaining ring 4 to the rotor core 3.

[0056] As a more preferable embodiment, an axial gap (not marked in the figure) is formed between the end face of each positioning post 11 close to the rear retaining ring 4 and one end of the external thread 13 close to the front retaining ring 2, and the stacking thickness of the rotor core 3 is greater than the length of each positioning post 11.

[0057] In this technical solution, the axial extension length of the positioning post 11 does not penetrate the entire length of the fitting section, but a section of axial gap is reserved. In this way, it is not necessary to modify the structure of the convex ring 41 for the positioning post 11, simplifying the structural design of the rear retaining ring 4.

[0058] It is worth emphasizing that all components inside the magnetic levitation bearing rotor of the present utility model are detachable, greatly reducing the losses caused by component damage and improving the assembly efficiency and fault tolerance. This can greatly improve the maintainability of the magnetic levitation bearing rotor and the profitability of the product. At the same time, the magnetic levitation bearing rotor of the present utility model can also reduce the stress on the punching sheet, and can effectively increase the maximum rotational speed that the punching sheet can withstand under the condition of punching sheets of the same material and specifications, helping to increase the speed of high-speed motors while improving reliability.

[0059] In a specific embodiment, the aforementioned bushing 1 and front retaining ring 2 are integrated structures and can be made of 40CrNiMoA material and formed by machining. When machining, it should be noted that a transition section, that is, the aforementioned axial gap, should be reserved between the positioning post 11 and the external thread 13, which can greatly improve the machining and assembly fault tolerance rate. The length of the transition section can be selected according to the actual length of the radial magnetic levitation bearing rotor and generally needs to be greater than 2 mm. Secondly, the helix direction of the internal thread 12 should be consistent with the rotation direction of the rotating shaft 100 to prevent the bearing rotor from falling off during operation.

[0060] The punching piece is made of silicon steel sheet material, and the grade can be selected according to its own needs. It is formed by die stamping. The positioning grooves on the punching piece usually adopt uniform distribution, and the number can be selected according to the actual situation. The more the number of positioning grooves, the higher the assembly accuracy. In this utility model, only 4 grooves assembly is taken as an example.

[0061] The rear retaining ring 4 can be made of 40CrNiMoA material and formed by machining. The convex ring 41 on its contact surface with the punching piece can effectively avoid abnormal assembly interference. Usually, the height of the convex ring 41 should be slightly longer than the axial length of the axial interval. At this time, the inner diameter of the convex ring 41 should not be less than the maximum outer diameter of each positioning post 11.

[0062] According to an embodiment of the present utility model, there is also provided a magnetic levitation bearing, such as a magnetic levitation radial bearing, including the above-mentioned magnetic levitation bearing rotor. In this technical solution, the rotor core 3 in the magnetic levitation bearing rotor no longer adopts the shrink-fitting process of the prior art, but is sleeved on the radial outer side of the bushing 1 by interference fit or clearance fit. The axial two ends of the rotor core 3 are respectively clamped by the front retaining ring 2 and the rear retaining ring 4 to realize the locking of the axial position of the rotor core 3. Since at least one of the front retaining ring 2 or the rear retaining ring 4 is threadedly connected to the bushing 1, the axial clamping force on the rotor core 3 can be ensured by the screwing torque. When it is shrink-fitted on the rotating shaft 100, there will be no gap formed between the two ends of the rotor core 3 and the front retaining ring 2 and / or the rear retaining ring 4 due to reheating the bearing rotor, ensuring the assembly quality. At the same time, since there is no need to heat and sleeve the rotor core 3 anymore, the processability and efficiency can be effectively improved.

[0063] According to an embodiment of the present utility model, specifically refer to Figure 9 As shown, there is also provided a rotating shaft assembly, including the above-mentioned magnetic levitation bearing rotor and the rotating shaft 100. The bushing 1 is threadedly connected to the rotating shaft 100, and the rear retaining ring 4 is in abutting connection with the shoulder end face of the rotating shaft 100, that is, after the magnetic levitation bearing rotor is assembled in place on the rotating shaft 100, the outer end face of the rear retaining ring 4 forms an axial abutting stop with the shoulder end face of the rotating shaft 100.

[0064] In this technical solution, since the rear retaining ring 4 forms an axial abutment with the shoulder of the rotating shaft 100 after assembly, it can effectively prevent the thread between the rear retaining ring 4 and the bushing 1 from loosening. At the same time, there is no need to increase the axial engagement length of the external thread 13 to prevent the thread at this position from loosening. Therefore, it is also beneficial to shorten the axial length of the rotating shaft 100, and thus beneficial to increase the maximum rotational speed of the rotating shaft 100. It should be noted that since the axial engagement length of the aforementioned internal thread 12 is much greater than the axial engagement length of the aforementioned external thread 13, and the helix direction of the internal thread 12 is consistent with the rotation direction of the rotating shaft 100, the threaded fit connection between the bushing 1 and the rotating shaft 100 is reliable and stable.

[0065] According to an embodiment of the present invention, there is also provided an assembling method of the rotating shaft assembly as described above, including the following steps:

[0066] Process and form each punching sheet for stacking to form the rotor core 3, the rear retaining ring 4, and integrally form the bushing 1 and the front retaining ring 2;

[0067] Successively sleeved each of the punching sheets on the fitting section of the bushing 1;

[0068] Threadedly connect the rear retaining ring 4 and the bushing 1 to form the clamping of the front retaining ring 2 and the rear retaining ring 4 on the rotor core 3, and the formed assembly is the magnetic levitation bearing rotor;

[0069] Orient the rear retaining ring 4 towards the shoulder side of the rotating shaft 100 and threadedly connect the magnetic levitation bearing rotor to the rotating shaft 100 through the bushing 1 it has.

[0070] In the rotating shaft assembly assembled by adopting this technical solution, there is no need to adopt the secondary hot sleeve process, and there will be no gaps formed between the two ends of the rotor core 3 and the front retaining ring 2 and / or the rear retaining ring 4 due to reheating the bearing rotor again, ensuring the assembly quality. At the same time, since there is no need to heat and sleeve the rotor core 3 anymore, the processability and efficiency can be effectively improved.

[0071] In some embodiments, during the process of successively sleeving each of the punching sheets on the fitting section of the bushing 1, the stacking thickness of the rotor core 3 is L. Among them, the number of positioning grooves 31 of the rotor core 3 is N. After sleeving each stack of punching sheets with a thickness of L / N, rotate the subsequent punching sheets to be sleeved by an angle of 2π / N and then continue to sleeve. L = n·d, where n is the number of punching sheets and is an integer multiple of N, and d is the thickness of each punching sheet. In this way, it is beneficial to eliminate the accumulation of burr tolerances and make the laminated sheets more flush.

[0072] The assembly process of the magnetic levitation bearing and the rotating shaft 100 of the present invention is specifically described as follows:

[0073] (1) First, place the front retaining ring (that is, the integrated bushing 1 and the front retaining ring 2) on the horizontal working surface, with the positioning post (that is, the aforementioned positioning post 11) and the external thread (that is, the aforementioned external thread 13) facing upwards. Align the punching sheet positioning groove (that is, the aforementioned positioning groove 31) with the front retaining ring positioning post and then sleeve it. Note that after sleeving a part of the punching sheets, it is necessary to rotate a certain angle and then continue to stack the sheets (for example, for N positioning grooves, after stacking 1 / N of the number of punching sheets each time, rotate by the angle of one groove and then continue to stack). This is beneficial to eliminate the accumulation of burr tolerances and make the laminated sheets more flush;

[0074] (2) Keep the front retaining ring and the punching piece stationary. Turn the surface of the boss of the rear retaining ring (i.e., the aforementioned rear retaining ring 4, which is the convex ring 41) horizontally downward. After aligning it with the punching piece, screw it tightly with the external thread of the front retaining ring. Since the boss is slightly longer than the transition section (i.e., the aforementioned axial interval), the punching piece will be pressed tightly. Thus, the radial magnetic levitation bearing rotor is assembled into a whole.

[0075] (3) Finally, assemble the radial magnetic levitation bearing rotor onto the rotor shaft (i.e., the aforementioned rotating shaft 100). Press the side of the rear retaining ring against the rotor shaft shoulder (i.e., the aforementioned rotating shaft shoulder). Screw the internal thread of the front retaining ring (i.e., the aforementioned internal thread 12) tightly with the external thread on the rotor shaft, and then the entire assembly process can be completed.

[0076] (6) It is easy for those skilled in the art to understand that, on the premise of no conflict, the advantageous technical features of the above various methods can be freely combined and superimposed.

[0077] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A magnetic levitation bearing rotor, characterized in that, It includes a bushing (1), on the outer circumferential wall of the bushing (1), a front retaining ring (2), a rear retaining ring (4) are sequentially arranged along its axial direction, and a rotor core (3) clamped between the front retaining ring (2) and the rear retaining ring (4), wherein, there is an interference fit or clearance fit between the rotor core (3) and the bushing (1), and at least one of the front retaining ring (2) and the rear retaining ring (4) is threadedly connected to the bushing (1).

2. The magnetic levitation bearing rotor according to claim 1, wherein The front retaining ring (2) and the bushing (1) are of an integral structure; and / or, internal threads (12) are formed on the inner pipe wall of the bushing (1), and the helix direction of the internal threads (12) is the same as that of the rotating shaft (100) assembled with it in a matching manner.

3. The magnetic suspension bearing rotor according to any one of claims 1 to 2, characterized in that, One end of the bushing (1) away from the front retaining ring (2) is the core assembly end, external threads (13) are formed on the outer circumferential wall of the core assembly end, and the maximum outer diameter of the external threads (13) is smaller than the outer diameter of the mating section of the bushing (1) assembled with the rotor core (3), and the rear retaining ring (4) is threadedly connected to the external threads (13).

4. The magnetic suspension bearing rotor according to claim 3, characterized in that, A plurality of positioning posts (11) are provided on the mating section, each of the positioning posts (11) extends along the axial direction of the bushing (1) and is arranged at intervals along the circumferential direction of the bushing (1), and positioning grooves (31) are provided on the inner ring wall surface of the rotor core (3) which are arranged in one-to-one correspondence with each of the positioning posts (11), and each of the positioning grooves (31) extends along the axial direction of the rotor core (3) and penetrates through both end faces thereof.

5. The magnetic suspension bearing rotor according to claim 4, wherein, A convex ring (41) is formed on the end face of the rear retaining ring (4) facing the front retaining ring (2), the inner ring wall diameter of the convex ring (41) is not less than the outer diameter of the mating section, and in the state where the magnetic suspension bearing rotor is in use, the free end face of the convex ring (41) can abut against the end face of the rotor core (3).

6. The magnetic suspension bearing rotor according to claim 5, characterized in that, An axial interval is formed between the end face of each of the positioning posts (11) on the side close to the rear retaining ring (4) and one end of the external threads (13) close to the front retaining ring (2), and the stack thickness of the rotor core (3) is greater than the length of each of the positioning posts (11).

7. A magnetic levitation bearing, characterized in that, It includes the magnetic suspension bearing rotor according to any one of claims 1 to 6.

8. A rotating shaft assembly, characterized in that, It includes the magnetic suspension bearing rotor according to any one of claims 1 to 6 and a rotating shaft (100), the bushing (1) is threadedly connected to the rotating shaft (100), and the rear retaining ring (4) is abutted and connected to the shoulder end face of the rotating shaft (100).

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