Electromagnetic bearing-rotor system

Abstract

The present disclosure relates to the technical field of electromagnetic bearing, and particularly relates to an electromagnetic bearing rotor system, which comprises a rotating shaft and a mounting base, the mounting base is coaxially provided with an electromagnetic bearing assembly and an auxiliary bearing assembly, the rotating shaft is arranged through the electromagnetic bearing assembly and the auxiliary bearing assembly; the auxiliary bearing assembly comprises an outer ring valve seat, an inner ring valve seat and an auxiliary bearing, the outer ring valve seat is connected with an outer ring of the auxiliary bearing, and the inner ring valve seat is connected with an inner ring; a gap is formed between the outer ring valve seat and the mounting base along the axial direction of the rotating shaft, an elastic member is arranged in the gap, a connecting hole for the rotating shaft is arranged on the inner ring valve seat, an abutting surface is formed on the wall of the connecting hole, the abutting surface is inclinedly extended along the axial direction of the rotating shaft and away from the rotating shaft, the rotating shaft is abutted with the abutting surface, so that the axial and radial loads are balanced through the elastic member, the auxiliary bearing is protected, the supporting effect of the auxiliary bearing assembly on the rotating shaft is further improved, and the electromagnetic bearing assembly is better protected.

Description

Technical Field

[0001] This disclosure relates to the field of electromagnetic bearing technology, and more particularly to an electromagnetic bearing rotor system. Background Technology

[0002] Electromagnetic bearings, as a novel support component, offer advantages such as contactless operation, wear-free operation, lubrication-free operation, high speed, low noise, and intelligent control. They represent another revolutionary change in the bearing industry following oil lubrication and air lubrication, and have been increasingly applied in industrial and aerospace fields in recent years. However, electromagnetic bearings are inherently unstable during use. When an electromagnetic bearing fails, the shaft may experience a drop impact, leading to damage to either the electromagnetic bearing or the shaft itself. Therefore, electromagnetic bearing rotor systems are typically equipped with protective bearings. When the shaft falls, it first lands on the auxiliary bearing, thus providing a cushioning effect and protecting both the shaft and the electromagnetic bearing.

[0003] However, in practical applications, electromagnetic bearing rotor systems are often used in high-speed or heavy-load equipment. After the electromagnetic bearing fails, the auxiliary bearing will be subjected to extremely large impact loads, leading to damage to the auxiliary bearing and failure of protection for the electromagnetic bearing. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this disclosure provides an electromagnetic bearing rotor system.

[0005] This disclosure provides an electromagnetic bearing rotor system, which includes a rotating shaft and a mounting base. An electromagnetic bearing assembly and an auxiliary bearing assembly are coaxially disposed on the mounting base, and the rotating shaft passes through the electromagnetic bearing assembly and the auxiliary bearing assembly.

[0006] The auxiliary bearing assembly includes an outer ring valve seat, an inner ring valve seat, and an auxiliary bearing. The outer ring valve seat is connected to the outer ring of the auxiliary bearing, and the inner ring valve seat is connected to the inner ring of the auxiliary bearing.

[0007] A gap is formed between the outer ring valve seat and the mounting base along the axial direction of the rotating shaft. An elastic element is provided in the gap. The inner ring valve seat is provided with a connecting hole for the rotating shaft to pass through. An abutment surface is formed on the wall of the connecting hole. The abutment surface extends obliquely away from the rotating shaft along the axial direction of the rotating shaft. The rotating shaft abuts against the abutment surface.

[0008] Optionally, the auxiliary bearing assembly further includes an annular abutment member disposed within the connecting hole, wherein the two end faces of the annular abutment member along the axial direction of the rotating shaft are formed as the abutment surface;

[0009] The outer wall of the rotating shaft has an abutment portion extending toward the annular abutment member, and the abutment portion abuts against the abutment surfaces at both ends of the annular abutment member.

[0010] Optionally, the connecting hole has a mounting portion extending toward the axis of the rotating shaft on its hole wall, and the annular abutment includes a first abutment ring and a second abutment ring, which are respectively disposed on both sides of the mounting portion along the axial direction of the rotating shaft;

[0011] Along the axial direction of the rotating shaft, the mutually distant ends of the first abutting ring and the second abutting ring respectively form an abutting surface.

[0012] Optionally, two abutting bushings are spaced apart on the outer wall of the rotating shaft, and the two abutting bushings together form the abutting part;

[0013] An installation gap is formed between the two abutting bushings, and the annular abutting member is located within the installation gap and abuts against the two abutting bushings.

[0014] Optionally, the mounting base includes a mounting sleeve and end caps covering both ends of the mounting sleeve. The end caps have mounting holes at their axial positions. The rotating shaft passes through the mounting sleeve, and both ends of the rotating shaft protrude from the mounting holes on the end caps located at both ends of the mounting sleeve.

[0015] The auxiliary bearing assembly is located within the mounting sleeve near the end cover, and the gap is formed between the outer ring valve seat and the end cover.

[0016] Optionally, the auxiliary bearing assembly further includes a clamping flange, which is disposed on the outer peripheral side of the outer ring valve seat and partially presses against the side of the outer ring valve seat facing away from the end cover.

[0017] The clamping flange and the end cap are connected by fasteners.

[0018] Optionally, the clamping flange and the outer ring valve seat together form a mounting groove on the side facing the end cover, and the mounting groove forms the gap.

[0019] Optionally, the number of auxiliary bearing assemblies is two, and the two auxiliary bearing assemblies are respectively disposed at both ends of the mounting base near the rotating shaft.

[0020] Optionally, the elastic element is a spring;

[0021] And / or, the annular abutment is a graphite ring.

[0022] Optionally, the electromagnetic bearing assembly includes an axial electromagnetic bearing, which includes a thrust disk and two axial electromagnetic bearing stators. The thrust disk is sleeved on the rotating shaft, and the two axial electromagnetic bearing stators are respectively disposed on both sides of the thrust disk along the axial direction of the rotating shaft.

[0023] The thrust disk has a connecting hole formed at the axial position of the rotating shaft for the rotating shaft to pass through. The wall of the connecting hole extends obliquely away from the rotating shaft along the axial direction of the rotating shaft. A connecting bushing is provided on the outer wall of the rotating shaft corresponding to the connecting hole. The extending direction of the outer wall of the connecting bushing matches the extending direction of the wall of the connecting hole.

[0024] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0025] The electromagnetic bearing rotor system disclosed herein provides an electromagnetic bearing assembly and an auxiliary bearing assembly coaxially mounted on a mounting base, with the rotating shaft passing through both assemblies. This allows the electromagnetic bearing assembly and the auxiliary bearing assembly to jointly support the rotating shaft. The auxiliary bearing assembly includes an outer ring valve seat, an inner ring valve seat, and an auxiliary bearing. A gap is formed between the outer ring valve seat and the mounting base along the axial direction of the rotating shaft. An elastic element is disposed within this gap, allowing the elastic element to balance the axial displacement of the rotating shaft relative to the mounting base when axial displacement occurs, thus preventing the auxiliary bearing from bearing excessive load. Excessive axial load, coupled with the fact that the connecting hole wall also has an abutment surface that extends obliquely away from the shaft along its axial direction, the shaft abuts against the abutment surface. This allows the obliquely set abutment surface to distribute part of the load force to the axial direction of the shaft when the shaft has a radial displacement deviation relative to the mounting base, and balance it through the elastic element. This greatly reduces the radial load borne by the auxiliary bearing, thus not only protecting the auxiliary bearing, but also further improving the support effect of the auxiliary bearing assembly on the shaft, thereby providing better protection for the electromagnetic bearing assembly. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0027] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0028] Figure 1This is a schematic diagram of the electromagnetic bearing rotor system according to an embodiment of the present disclosure;

[0029] Figure 2 This is a schematic diagram of the auxiliary bearing assembly of the electromagnetic bearing rotor system described in an embodiment of this disclosure;

[0030] Figure 3 This is a schematic diagram of the structure of the axial electromagnetic bearing of the electromagnetic bearing rotor system described in the embodiments of this disclosure.

[0031] The components include: 1. Shaft; 11. Shaft sleeve; 12. Abutment bushing; 2. Mounting base; 21. Mounting sleeve; 22. End cover; 3. Electromagnetic bearing assembly; 31. Radial electromagnetic bearing; 31a. Radial electromagnetic bearing rotor; 31b. Radial electromagnetic bearing stator; 32. Axial electromagnetic bearing; 32a. Thrust disc; 32b. Axial electromagnetic bearing stator; 4. Auxiliary bearing assembly; 41. Outer ring valve seat; 42. Inner ring valve seat; 43. Auxiliary bearing; 44. Elastic element; 45. Annular abutment element; 451. First abutment ring; 452. Second abutment ring; 46. Mounting part; 47. Pressure flange; 48. Adjusting shim; 49. Fastener; 5. High-speed motor; 6. Radial electromagnetic bearing sensor; 7. Axial electromagnetic bearing sensor; 8. Connecting bushing. Detailed Implementation

[0032] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0033] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0034] like Figure 1-3 As shown, this embodiment provides an electromagnetic bearing rotor system, including a rotating shaft 1 and a mounting base 2. An electromagnetic bearing assembly 3 and an auxiliary bearing assembly 4 are coaxially arranged on the mounting base 2, and the rotating shaft 1 passes through the electromagnetic bearing assembly 3 and the auxiliary bearing assembly 4.

[0035] For example, the electromagnetic bearing assembly 3 includes a radial electromagnetic bearing 31 and an axial electromagnetic bearing 32, both of which are sleeved on the rotating shaft 1. The radial electromagnetic bearing 31 is used to support the radial load of the rotating shaft 1, and the axial electromagnetic bearing 32 is used to support the axial load of the rotating shaft 1.

[0036] Both the radial electromagnetic bearing 31 and the axial electromagnetic bearing 32 rotatably support the rotating shaft 1. When the radial electromagnetic bearing 31 is energized, it generates a magnetic force along the radial direction of the rotating shaft 1, and when the axial electromagnetic bearing 32 is energized, it generates a magnetic force along the axial direction of the rotating shaft 1. The radial magnetic force generated by the radial electromagnetic bearing 31 and the axial magnetic force generated by the axial electromagnetic bearing 32 suspend and support the rotating shaft 1 in a non-contact manner, so that the rotating shaft 1 has no mechanical contact with the radial electromagnetic bearing 31 and the axial electromagnetic bearing 32, thereby preventing mechanical wear on the radial electromagnetic bearing 31 and the axial electromagnetic bearing 32 sleeved on the rotating shaft 1.

[0037] For example, at least one radial electromagnetic bearing 31 and one axial electromagnetic bearing 32 are provided. In this embodiment, two axial electromagnetic bearings 32 and one radial electromagnetic bearing 31 are provided, and the two axial electromagnetic bearings 32 are respectively located at the two ends of the mounting base 2 near the rotating shaft 1.

[0038] The electromagnetic bearing rotor system also includes a high-speed motor 5 and a controller. The high-speed motor 5 is used to drive the rotating shaft 1 to rotate. In use, the electromagnetic bearing rotor system can be placed vertically or horizontally. The high-speed motor 5 is mounted on the mounting base 2 and connected to the end of the rotating shaft 1.

[0039] In some embodiments, the radial electromagnetic bearing 31 includes a radial electromagnetic bearing rotor 31a and a radial electromagnetic bearing stator 31b. The radial electromagnetic bearing rotor 31a is mounted on the outer wall of the rotating shaft 1, and the radial electromagnetic bearing stator 31b is correspondingly disposed on the outer periphery of the radial electromagnetic bearing rotor 31a, with a gap forming between them. The radial electromagnetic bearing rotor 31a contains a cylindrical magnetic circuit made of electroplated steel plate, which is fixed to the outer wall of the rotating shaft 1 and works in conjunction with the radial electromagnetic bearing stator 31b to achieve rotor levitation.

[0040] For example, the electromagnetic bearing rotor system also includes two radial electromagnetic bearing 31 sensors corresponding to the two radial electromagnetic bearings 31. The radial electromagnetic bearing 31 sensors are located on one side of the radial electromagnetic bearings 31. When the electromagnetic bearing rotor system is operating normally, the two radial electromagnetic bearing 31 sensors can acquire the radial displacement signal of the shaft 1 in real time. When the shaft 1 has a radial displacement deviation, the controller can change the current of the two radial electromagnetic bearings 31 according to the deviation signal sent by the sensors to correct the radial position of the rotor.

[0041] In some embodiments, the axial electromagnetic bearing 32 includes a thrust disk 32a and two axial electromagnetic bearing stators 32b. The thrust disk 32a is sleeved on the rotating shaft 1, and the two axial electromagnetic bearing stators 32b are respectively disposed on both sides of the thrust disk 32a along the axial direction of the rotating shaft 1.

[0042] For example, the electromagnetic bearing rotor system also includes an axial electromagnetic bearing 32 sensor. When the electromagnetic bearing rotor system is working normally, the axial electromagnetic bearing 32 sensor can collect the axial displacement signal of the shaft 1 in real time. When the shaft 1 has an axial displacement deviation, the controller can change the current in the axial electromagnetic bearing stators 32b of the two axial electromagnetic bearings 32 located on both sides of the thrust disk 32a according to the deviation signal sent by the sensor, thereby changing the force exerted by the two axial electromagnetic bearing stators 32b on the thrust disk 32a, causing the thrust disk 32a to move along the axial direction of the shaft 1, and driving the shaft 1 to move, thereby correcting the axial position of the shaft 1.

[0043] For example, when installing the above structures, radial electromagnetic bearings 31 can be mounted at both ends of the rotating shaft 1 to support its rotation. An axial electromagnetic bearing 32 is mounted on the portion of the rotating shaft 1 located between the two radial electromagnetic bearings 31. An axial electromagnetic bearing 32 sensor is mounted on one side of the axial electromagnetic bearing 32, and a high-speed motor 5 is mounted on the portion of the rotating shaft 1 located between the two radial electromagnetic bearings 31. Of course, other arrangements can be used in other embodiments.

[0044] Furthermore, along the axial direction of the rotating shaft 1, the radial electromagnetic bearing rotor 31a and the thrust disk 32a, the thrust disk 32a and the axial electromagnetic bearing 32 sensor, the axial electromagnetic sensor and the high-speed motor 5, and the high-speed motor 5 and the radial electromagnetic bearing rotor 31a can all be limited and fitted by the sleeve of the rotating shaft 1.

[0045] The auxiliary bearing assembly 4 includes an outer ring valve seat 41, an inner ring valve seat 42, and an auxiliary bearing 43. The outer ring valve seat 41 is connected to the outer ring of the auxiliary bearing 43, and the inner ring valve seat 42 is connected to the inner ring of the auxiliary bearing 43. A gap is formed between the outer ring valve seat 41 and the mounting base 2 along the axial direction of the rotating shaft 1. An elastic element 44 is provided in the gap. The inner ring valve seat 42 is provided with a connecting hole for the rotating shaft 1 to pass through. An abutment surface is formed on the wall of the connecting hole. The abutment surface extends obliquely away from the rotating shaft 1 along the axial direction of the rotating shaft 1. The rotating shaft 1 abuts against the abutment surface.

[0046] In practical implementation, when the electromagnetic bearing rotor system is in normal operation, the axial electromagnetic bearing 32 sensor can collect the axial displacement signal of the shaft 1 in real time. When an axial displacement deviation occurs, the controller can change the current in the magnetic circuit of the axial electromagnetic bearing stator 32b to correct the axial position of the thrust disk 32a. When the axial electromagnetic bearing 32 fails, the axial load can be transmitted to the outer ring valve seat 41 through the inner ring valve seat 42 and the auxiliary bearing 43. Since an elastic element 44 is provided between the outer ring valve seat 41 and the mounting base 2 of the rotor system, the axial load of the shaft 1 can be buffered by the elastic element 44 to balance the load force. For example, the maximum axial displacement that the elastic element 44 can compress can be less than the allowable clearance value between the thrust disk 32a and the axial electromagnetic bearing stator 32b to avoid damage to the axial electromagnetic bearing 32.

[0047] Correspondingly, the radial electromagnetic bearing 31 sensor can collect the radial displacement signal of the rotating shaft 1 in real time. When a radial displacement deviation occurs, the controller changes the current in the two radial electromagnetic bearing rotors 31a to correct the radial position of the rotating shaft 1. When the radial electromagnetic bearing 31 fails, since the rotating shaft 1 abuts against the contact surface on the inner ring valve seat 42, the radial load will be transmitted to the inner ring valve seat 42 through the contact surface. Since the contact surface extends obliquely away from the rotating shaft 1 along the axial direction, the load force will be distributed in both the axial and radial directions along the rotating shaft 1. The radial load can be borne by the auxiliary bearing 43, while the axial load can be transmitted to the auxiliary bearing 43 through the inner ring valve seat 42, and then to the outer ring valve seat 41 through the auxiliary bearing 43. The load force is then buffered by the elastic element 44 to balance the load force.

[0048] In this process, the elastic element 44 mainly serves as the first line of defense for balancing the load, while the auxiliary bearing 43 serves as the second line of defense for ensuring the safety and reliability of the electromagnetic bearing rotor system. For example, the auxiliary bearing 43 can be a ball bearing; however, in other embodiments, the auxiliary bearing 43 can also adopt other forms of bearing structure.

[0049] The electromagnetic bearing rotor system provided in this embodiment, by coaxially arranging an electromagnetic bearing assembly 3 and an auxiliary bearing assembly 4 on a mounting base 2, allows the rotating shaft 1 to pass through both the electromagnetic bearing assembly 3 and the auxiliary bearing assembly 4, so that the electromagnetic bearing assembly 3 and the auxiliary bearing assembly 4 jointly support the rotating shaft 1. Furthermore, the auxiliary bearing assembly 4 includes an outer ring valve seat 41, an inner ring valve seat 42, and an auxiliary bearing 43. A gap is formed between the outer ring valve seat 41 and the mounting base 2 along the axial direction of the rotating shaft 1. An elastic element 44 is disposed in the gap, thereby balancing the axial displacement of the rotating shaft 1 relative to the mounting base 2 when the rotating shaft 1 experiences axial displacement deviation, preventing... The auxiliary bearing 43 bears excessive axial load. At the same time, the wall of the connecting hole is formed with an abutment surface that extends obliquely away from the shaft 1 along the axial direction. The shaft 1 abuts against the abutment surface, so that when the shaft 1 has radial displacement deviation relative to the mounting base 2, part of the load force can be distributed to the axial direction of the shaft 1 by the obliquely set abutment surface, and balanced by the elastic element 44. This greatly reduces the radial load borne by the auxiliary bearing 43. Therefore, it not only protects the auxiliary bearing 43, but also further improves the support effect of the auxiliary bearing assembly 4 on the shaft 1, thus providing better protection for the electromagnetic bearing assembly 3.

[0050] The electromagnetic bearing rotor system provided in this embodiment can be applied to air compressors, where it is placed horizontally. Of course, in other embodiments, this electromagnetic bearing rotor system can also be applied to other applications, such as turbine rotor systems in nuclear reactors, flywheel energy storage rotor systems in regenerative braking energy systems, etc. When the rotor system is placed vertically, the axial load is generally large; in this case, the auxiliary bearing assembly 4 provided in this embodiment better demonstrates its ability to balance the axial load.

[0051] In some embodiments, the elastic element 44 may be a spring. For example, the spring may be a ring spring wound around the outer ring of the shaft 1 to provide a cushioning effect in all directions. Of course, in other embodiments, the elastic element 44 may also employ other types of structures, such as elastic washers.

[0052] Reference Figure 2 As shown, in some embodiments, a stepped hole may be provided on the outer ring valve seat 41 to support the outer ring of the auxiliary bearing 43, so as to facilitate the positioning and fixing of the auxiliary bearing 43. Correspondingly, a stepped hole may also be provided on the outer side of the inner ring valve seat 42 to support the inner ring of the auxiliary bearing 43, so as to cooperate with the outer ring valve seat 41 to position and fix the auxiliary bearing 43.

[0053] In some embodiments, there are two auxiliary bearing assemblies 4, which are respectively disposed at both ends of the mounting base 2 near the rotating shaft 1. By providing two auxiliary bearing assemblies 4, each located at one end of the mounting base 2 near the rotating shaft 1, both ends of the rotating shaft 1 can be supported, and the shaft 1 can withstand the impact of a fall, thereby further improving the support and protection of the rotating shaft 1.

[0054] For example, during installation, the two auxiliary bearing assemblies 4 can be respectively positioned at both ends of the mounting base 2 near the rotating shaft 1, and the two radial electromagnetic bearings 31 are respectively installed on the inner side of the rotating shaft 1 relative to the auxiliary bearing assemblies 4.

[0055] In some embodiments, the auxiliary bearing assembly 4 further includes an annular abutment 45 disposed in the connecting hole, wherein the two end faces of the annular abutment 45 along the axial direction of the rotating shaft 1 are formed as abutment surfaces, and the outer wall of the rotating shaft 1 has an abutment portion extending toward the annular abutment 45, the abutment portion abutting against the abutment surfaces at both ends of the annular abutment 45.

[0056] By setting the annular abutment part 45, the inner ring valve seat 42 of the auxiliary bearing assembly 4 can be abutted against the rotating shaft 1, and it is annular along the circumference of the rotating shaft 1, which can achieve the abutment effect in all directions.

[0057] For example, the annular abutment 45 can be a graphite ring. The graphite ring is made of flexible graphite by molding, and has the characteristics of high temperature resistance and wear resistance. It can also play a certain role in buffering the axial and radial loads of the rotating shaft 1.

[0058] In some embodiments, the connecting hole has a mounting portion 46 extending toward the axis of the rotating shaft 1 on its hole wall. The annular abutment member 45 includes a first abutment ring 451 and a second abutment ring 452. The first abutment ring 451 and the second abutment ring 452 are respectively disposed on both sides of the mounting portion 46 along the axial direction of the rotating shaft 1. Furthermore, along the axial direction of the rotating shaft 1, the mutually distant ends of the first abutment ring 451 and the second abutment ring 452 respectively form an abutment surface.

[0059] For example, the mounting part 46 is an annular protrusion extending from the wall of the connecting hole toward the axis of the rotating shaft 1. The two end faces of the mounting part 46 along the axial direction of the rotating shaft 1 can be planes extending radially along the rotating shaft 1. One end of the first abutment ring 451 and the second abutment ring 452 is a plane, and the other end is a conical surface. The conical surface contacts the rotating shaft 1, so that when the rotating shaft 1 is subjected to axial load, the force can be transferred to the mounting part 46, and the force can be divided into axial and radial parts by the inclined conical surface.

[0060] In some embodiments, two abutment bushings 12 are spaced apart on the outer wall of the rotating shaft 1, and the two abutment bushings 12 together form the abutment portion. An installation gap is formed between the two abutment bushings 12, and the annular abutment member 45 is located within the installation gap and abuts against the two abutment bushings 12. This arrangement facilitates the abutment effect between the rotating shaft 1 and the annular abutment member 45 in both directions along the axis of the rotating shaft 1, and also facilitates the installation and fixation of the structure.

[0061] In some embodiments, the mounting base 2 includes a mounting sleeve 21 and end caps 22 covering both ends of the mounting sleeve 21. The end caps 22 have mounting holes at their axial positions. The rotating shaft 1 passes through the mounting sleeve 21, and both ends of the rotating shaft 1 pass through the mounting holes on the end caps 22 located at both ends of the mounting sleeve 21.

[0062] Furthermore, the auxiliary bearing assembly 4 is disposed within the mounting sleeve 21 near the end cap 22, and the gap is formed between the outer ring valve seat 41 and the end cap 22. This arrangement facilitates the connection between the auxiliary bearing assembly 4 and the mounting base 2. Of course, in other embodiments, the auxiliary bearing assembly 4 can also be disposed at other locations within the mounting sleeve 21, for example, by providing an extended structure on the inner wall of the mounting sleeve 21, with the auxiliary bearing assembly 4 correspondingly matched and connected to this extended structure.

[0063] In some embodiments, the auxiliary bearing assembly 4 further includes a clamping flange 47, which is disposed on the outer periphery of the outer ring valve seat 41 and partially presses against the side of the outer ring valve seat 41 facing away from the end cap 22. The clamping flange 47 and the end cap 22 are connected by fasteners 49. The clamping flange 47 is used to install and fix the auxiliary bearing assembly 4 and the end cap 22, ensuring the stability of the auxiliary bearing assembly 4 during use.

[0064] For example, the clamping flange 47 and the outer ring valve seat 41 together form a mounting groove on the side facing the end cover 22, and the mounting groove forms the gap. The mounting groove facilitates the positioning of the elastic element 44.

[0065] For example, an adjusting shim 48 may also be sandwiched between the clamping flange 47 and the outer ring valve seat 41. The adjusting shim 48 not only provides a certain degree of protection for the contact surfaces of the clamping flange 47 and the outer ring valve seat 41, but also allows the distance between the clamping flange 47 and the outer ring valve seat 41 to be adjusted by adjusting the thickness of the adjusting shim 48.

[0066] Correspondingly, when installing the auxiliary bearing assembly 4, the auxiliary bearing 43 can be first installed between the outer ring valve seat 41 and the inner ring valve seat 42. Then, the auxiliary bearing 43, the outer ring valve seat 41, and the inner ring valve seat 42 are fixed together with the end cover 22 and the mounting bushing in the end cover 22. The elastic element 44 is placed in the mounting groove formed by the clamping flange 47 and the outer ring valve seat 41, and then the elastic element 44 is locked with the outer ring valve seat 41 and the end cover 22 by the fasteners 49.

[0067] The fastener 49 can be a connecting bolt. The clamping flange 47 has connecting screw holes circumferentially. The end cover 22 also has mounting screw holes at the corresponding positions of all the connecting screw holes. The connecting bolt passes through both the connecting screw holes and the mounting screw holes and is secured with a nut. Furthermore, the elastic element 44 can achieve different buffering forces by adjusting the tightening position of the connecting bolts.

[0068] In some embodiments, a connecting hole for the rotating shaft 1 to pass through is formed at a position of the thrust disk 32a of the axial electromagnetic bearing 32 along the axis of the rotating shaft 1. The wall of the connecting hole extends in a direction away from the rotating shaft 1 along the axial direction of the rotating shaft 1, and a connecting bushing 8 is provided on the outer wall of the corresponding connecting hole of the rotating shaft 1, the extension direction of the outer wall of the connecting bushing 8 matching the extension direction of the wall of the connecting hole.

[0069] For example, a cylindrical hole is formed in the connecting bushing 8 at a position along the axial direction of the rotating shaft 1 for fitting with the rotating shaft 1. The outer wall of the connecting bushing 8 matches the wall of the connecting hole, that is, the extension direction of the outer wall of the connecting bushing 8 is also along the axial direction of the rotating shaft 1 in a direction away from the rotating shaft 1. In other words, the outer surface of the bushing can be set as a tapered surface, for example, to fit with the inner wall of the connecting hole of the thrust plate 32a, thereby ensuring that the axial center position of the thrust plate 32a of the axial electromagnetic bearing 32 is centered, so as to reduce the possibility of radial off-center load during use of the axial electromagnetic bearing 32.

[0070] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0071] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electromagnetic bearing rotor system, characterized in that, It includes a rotating shaft (1) and a mounting base (2). An electromagnetic bearing assembly (3) and an auxiliary bearing assembly (4) are coaxially arranged on the mounting base (2). The rotating shaft (1) passes through the electromagnetic bearing assembly (3) and the auxiliary bearing assembly (4). The auxiliary bearing assembly (4) includes an outer ring valve seat (41), an inner ring valve seat (42), and an auxiliary bearing (43). The outer ring valve seat (41) is connected to the outer ring of the auxiliary bearing (43), and the inner ring valve seat (42) is connected to the inner ring of the auxiliary bearing (43). A gap is formed between the outer ring valve seat (41) and the mounting base (2) along the axial direction of the rotating shaft (1). An elastic element (44) is provided in the gap. A connecting hole for the rotating shaft (1) to pass through is provided on the inner ring valve seat (42). An abutment surface is formed on the wall of the connecting hole. The abutment surface extends obliquely away from the rotating shaft (1) along the axial direction of the rotating shaft (1). The rotating shaft (1) abuts against the abutment surface. The auxiliary bearing assembly (4) further includes an annular abutment (45) disposed in the connecting hole, wherein the two end faces of the annular abutment (45) along the axial direction of the rotating shaft (1) are formed as the abutment surfaces; The outer wall of the rotating shaft (1) has an abutment portion extending toward the annular abutment member (45), and the abutment portion abuts against the abutment surfaces at both ends of the annular abutment member (45).

2. The electromagnetic bearing rotor system according to claim 1, characterized in that, The connecting hole has a mounting portion (46) extending toward the axis of the rotating shaft (1) on its wall. The annular abutment (45) includes a first abutment ring (451) and a second abutment ring (452), which are respectively disposed on both sides of the mounting portion (46) along the axial direction of the rotating shaft (1). Along the axial direction of the pivot (1), the mutually distant ends of the first abutment ring (451) and the second abutment ring (452) respectively form an abutment surface.

3. The electromagnetic bearing rotor system according to claim 1, characterized in that, Two abutting bushings (12) are spaced apart on the outer wall of the rotating shaft (1), and the two abutting bushings (12) together form the abutting part; An installation gap is formed between the two abutting bushings (12), and the annular abutting member (45) is located within the installation gap and abuts against the two abutting bushings (12).

4. The electromagnetic bearing rotor system according to claim 1, characterized in that, The elastic element (44) is a spring; And / or, the annular abutment (45) is a graphite ring.

5. The electromagnetic bearing rotor system according to claim 1, characterized in that, The mounting base (2) includes a mounting sleeve (21) and end caps (22) covering both ends of the mounting sleeve (21). The end caps (22) have mounting holes at their axial positions. The rotating shaft (1) passes through the mounting sleeve (21), and both ends of the rotating shaft (1) pass through the mounting holes on the end caps (22) located at both ends of the mounting sleeve (21). The auxiliary bearing assembly (4) is located inside the mounting sleeve (21) near the end cap (22), and the gap is formed between the outer ring valve seat (41) and the end cap (22).

6. The electromagnetic bearing rotor system according to claim 5, characterized in that, The auxiliary bearing assembly (4) also includes a clamping flange (47), which is disposed on the outer periphery of the outer ring valve seat (41) and partially pressed against the side of the outer ring valve seat (41) facing away from the end cap (22); The clamping flange (47) and the end cap (22) are connected by fasteners (49).

7. The electromagnetic bearing rotor system according to claim 6, characterized in that, The clamping flange (47) and the outer ring valve seat (41) together form a mounting groove on the side facing the end cap (22), and the mounting groove forms the gap.

8. The electromagnetic bearing rotor system according to any one of claims 1 to 6, characterized in that, The number of auxiliary bearing assemblies (4) is two, and the two auxiliary bearing assemblies (4) are respectively located at both ends of the mounting base (2) near the rotating shaft (1).

9. The electromagnetic bearing rotor system according to any one of claims 1 to 6, characterized in that, The electromagnetic bearing assembly (3) includes an axial electromagnetic bearing (32), which includes a thrust disk (32a) and two axial electromagnetic bearing stators (32b). The thrust disk (32a) is sleeved on the rotating shaft (1), and the two axial electromagnetic bearing stators (32b) are respectively disposed on both sides of the thrust disk (32a) along the axial direction of the rotating shaft (1). The thrust disk (32a) has a connecting hole formed at the position along the axis of the rotating shaft (1) for the rotating shaft (1) to pass through. The wall of the connecting hole extends obliquely away from the rotating shaft (1) along the axial direction of the rotating shaft (1). A connecting bushing is provided on the outer wall of the rotating shaft (1) corresponding to the connecting hole. The extending direction of the outer wall of the connecting bushing matches the extending direction of the wall of the connecting hole.

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