Assembly fixtures and assembly methods for rotating parts of electromagnetic bearings

Abstract

This application discloses an assembly fixture and assembly method for an electromagnetic bearing rotating component. The electromagnetic bearing rotating component includes a target bushing, a magnetic steel bushing assembly, and an auxiliary bearing bushing, which are sequentially mounted on a rotating shaft. The assembly fixture includes a fixture bushing, a pressing assembly, and a drive unit. The fixture bushing can be fitted onto the rotating shaft and abuts against the target bushing. The pressing assembly can at least partially be fitted onto the rotating shaft and abuts against the magnetic steel bushing assembly or the auxiliary bearing bushing. The drive unit is used to apply axial pressure to the fixture bushing and / or the pressing assembly. The assembly fixture of this application solves the assembly defects that occur during the cooling process of the electromagnetic bearing rotating component's heat-shrink sleeve. It not only ensures that the relative position of the electromagnetic bearing rotating component and the rotating shaft remains unchanged, providing assembly accuracy, but also ensures that the silicon steel sheets are always tightly stacked, thereby ensuring the performance and reliability of the electromagnetic bearing.

Description

Technical Field

[0001] This application relates to the field of electromagnetic bearing technology, specifically to an assembly fixture and assembly method for an electromagnetic bearing rotating component. Background Technology

[0002] Electromagnetic bearings are high-performance bearings that use electromagnetic force to levitate a rotor. They offer advantages such as wear-free operation, no lubrication required, and long service life, and have been increasingly widely used in turbomachinery in recent years. The main body of an electromagnetic bearing consists of a stator and a rotor. The stator primarily includes magnetic poles, a speed and displacement sensor, and necessary structural connecting components. The rotor mainly comprises a rotating shaft and rotating parts mounted on the shaft. The rotating parts primarily include a target bushing, a magnetic bushing assembly, and auxiliary bearing bushings.

[0003] Because turbines operate at high speeds, rotating components are typically heat-fitted onto the rotating shaft with a large interference fit to prevent loosening during operation. However, the temperature drop during heat fitting causes the rotating components to contract, leading to misalignment in their relative position on the shaft. More seriously, since the magnet bushing assembly is composed of numerous stacked thin silicon steel sheets, deformation and contraction during cooling can cause defects in the stacking of the silicon steel sheets, resulting in deterioration of properties such as iron loss and magnetic flux density. In severe cases, this can threaten the rotor's scrap value. Summary of the Invention

[0004] This application provides an assembly fixture and assembly method for an electromagnetic bearing rotating component, which solves the assembly defects that occur during the cooling process of the electromagnetic bearing rotating component's heat sleeve. It not only ensures that the relative position of the electromagnetic bearing rotating component and the rotating shaft remains unchanged, providing assembly accuracy, but also ensures that the silicon steel sheets are always tightly stacked, thereby ensuring the performance and reliability of the electromagnetic bearing.

[0005] This application provides an assembly fixture for an electromagnetic bearing rotating component, comprising: the electromagnetic bearing rotating component including a target bushing, a magnet bushing assembly, and an auxiliary bearing bushing sequentially mounted on a rotating shaft; the assembly fixture including a tooling bushing, a pressing assembly, and a driving unit; the tooling bushing being able to be fitted onto the rotating shaft and abutting against the target bushing; the pressing assembly being at least partially able to be fitted onto the rotating shaft and abutting against the magnet bushing assembly or the auxiliary bearing bushing; and the driving unit being used to apply axial pressure to the tooling bushing and / or the pressing assembly.

[0006] In some embodiments, the outer diameter of the tooling bushing matches the outer diameter of the target bushing, and the inner diameter of the tooling bushing is larger than the inner diameter of the target bushing.

[0007] In some embodiments, the extrusion assembly includes a pressure plate, a connecting plate, and a connecting assembly connecting the pressure plate and the connecting plate, wherein the pressure plate is disposed away from the driving part, and the connecting plate is disposed adjacent to the driving part.

[0008] In some embodiments, the connecting assembly includes a connecting rod and a limiting member. The pressure plate is provided with a first connecting hole, and the connecting plate is provided with a second connecting hole corresponding to the first connecting hole. One end of the connecting rod is fixedly connected to one of the first and second connecting holes, and the other end of the connecting rod is movably connected to the other of the first and second connecting holes. The limiting member is disposed between the connecting rod and the pressure plate, and the axial distance between the pressure plate and the connecting plate on the rotation axis can be adjusted by adjusting the position of the limiting member; or...

[0009] The connecting assembly includes a connecting rod, the two ends of which are threaded to the first connecting hole and the second connecting hole, respectively. By rotating the connecting rod, the axial distance between the pressure plate and the connecting plate on the rotating shaft can be adjusted.

[0010] In some embodiments, there are multiple first connecting holes and multiple second connecting holes, with the multiple first connecting holes evenly distributed along the circumference of the pressure plate and the multiple second connecting holes evenly distributed along the circumference of the connecting plate.

[0011] In some embodiments, the pressure plate is provided with a hollow portion, which is used to provide clearance space, and the outer diameter of the pressure plate is larger than the outer diameter of the magnet bushing assembly.

[0012] In some embodiments, the auxiliary bearing bushing is divided into a first part and a second part. The first part is disposed close to the magnet bushing assembly relative to the second part. The outer diameter of the first part is larger than the outer diameter of the second part. The pressure plate can be sleeved on the second part and abut against the first part.

[0013] In some embodiments, a boss is provided on the side of the pressure plate facing away from the connecting plate, the inner diameter of the boss being the same as the inner diameter of the pressure plate, and the boss being able to abut against the side of the first portion facing away from the magnet bushing assembly.

[0014] In some embodiments, one end of the rotating shaft is provided with an impeller threaded tie rod, the connecting plate is sleeved on the impeller threaded tie rod, the driving part is provided on the side of the connecting plate facing away from the pressure plate and abuts against the connecting plate, the driving part is a locking nut, the internal thread of the driving part and the external thread of the impeller threaded tie rod cooperate with each other, and axial pressure is applied to the extrusion assembly by rotating the driving part.

[0015] In some embodiments, the drive unit, the impeller threaded rod, and the rotating shaft are coaxially arranged.

[0016] In some embodiments, the outer peripheral surface of the drive unit is provided with a rotating part, which has a hexagonal structure.

[0017] An assembly method for an electromagnetic bearing rotating component, using an assembly fixture as described in any one of the above, the assembly method comprising:

[0018] The target bushing is installed at a predetermined position on the rotating shaft, and axial pressure is applied to the target bushing through the assembly fixture;

[0019] The magnet bushing assembly is installed at a predetermined position on the rotating shaft, and axial pressure is applied to the magnet bushing assembly by the assembly fixture;

[0020] The auxiliary bearing bushing is installed at a predetermined position on the rotating shaft, and axial pressure is applied to the auxiliary bearing bushing using the assembly tool.

[0021] In some embodiments, the step of installing the target bushing at a predetermined position on the rotating shaft and applying axial pressure to the target bushing using the assembly fixture includes:

[0022] Heat the target bushing to a predetermined temperature;

[0023] The target bushing is installed at a predetermined position on the rotating shaft;

[0024] The tooling bushing and the extrusion assembly are sequentially fitted onto the rotating shaft, and the drive unit cooperates with the impeller threaded rod so that the tooling bushing applies axial pressure to the target bushing.

[0025] Wait for the target bushing to cool to the predetermined temperature;

[0026] The step of installing the magnet bushing assembly at a predetermined position on the rotating shaft and applying axial pressure to the magnet bushing assembly using the assembly fixture includes:

[0027] Heat the magnet bushing assembly to a predetermined temperature;

[0028] The magnet bushing assembly is installed at a predetermined position on the rotating shaft;

[0029] The extrusion assembly is sleeved on the rotating shaft, and the drive unit cooperates with the impeller threaded rod so that the extrusion assembly applies axial pressure to the magnet bushing assembly.

[0030] Wait for the magnet bushing assembly to cool to the predetermined temperature;

[0031] The step of installing the auxiliary bearing sleeve at a predetermined position on the rotating shaft and applying axial pressure to the auxiliary bearing sleeve using the assembly fixture includes:

[0032] Heat the auxiliary bearing bushing to a predetermined temperature;

[0033] The auxiliary bearing bushing is installed at a predetermined position on the rotating shaft;

[0034] The extrusion assembly is sleeved on the rotating shaft, and the drive unit cooperates with the impeller threaded rod so that the extrusion assembly applies axial pressure to the auxiliary bearing bushing.

[0035] Wait for the auxiliary bearing bushing to cool to the predetermined temperature.

[0036] In some embodiments, the step of waiting for the target bushing to cool to a predetermined temperature further includes: checking the locking status of the drive unit while waiting for the target bushing to cool;

[0037] After the target bushing is cooled to a predetermined temperature, the drive unit, the extrusion assembly, and the tooling bushing are removed in sequence.

[0038] The step of waiting for the magnet bushing assembly to cool down to a predetermined temperature further includes: checking the locking status of the drive unit while waiting for the magnet bushing assembly to cool down;

[0039] After the magnet bushing assembly is cooled to a predetermined temperature, the drive unit and the extrusion assembly are removed in sequence.

[0040] The step of waiting for the auxiliary bearing bushing to cool down to a predetermined temperature further includes: checking the locking status of the drive unit while waiting for the auxiliary bearing bushing to cool down;

[0041] After the auxiliary bearing bushing is cooled to a predetermined temperature, the drive unit and the extrusion assembly are removed in sequence.

[0042] Beneficial Effects: Compared with the prior art, the assembly fixture and assembly method for the electromagnetic bearing rotating component provided in this application continuously apply axial pressure to the electromagnetic bearing rotating component during the heat-shrinking process, solving the assembly defects that occur during the heat-shrinking process. This not only ensures that the relative position of the electromagnetic bearing rotating component and the rotating shaft remains unchanged, providing assembly accuracy, but also ensures that the silicon steel sheets are always tightly stacked, thereby ensuring the performance and reliability of the electromagnetic bearing. Furthermore, the assembly fixture has a reasonable structural design, and the components are easy to install and disassemble. This assembly fixture can be used for the heat-shrinking assembly of multiple components of the electromagnetic bearing rotating component, exhibiting good versatility, reducing the types of assembly fixtures, and lowering costs. During the assembly process, except for the heat-shrinking operation, personnel do not need to directly contact high-temperature components, reducing the risk of burns and ensuring the safety of operators. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is an exploded structural diagram of the assembly tooling of this application;

[0045] Figure 2 This is a three-dimensional structural diagram of the tooling used to install the target bushing in this application;

[0046] Figure 3 yes Figure 2 The diagram shows the planar structure of the assembly tooling when installing the target bushing.

[0047] Figure 4 It is along Figure 3 Schematic diagram of the cross section of line AA;

[0048] Figure 5 This is a three-dimensional structural diagram of the assembly tooling for installing the magnet bushing assembly in this application;

[0049] Figure 6 yes Figure 5 The diagram shows a planar structure of the assembly tooling used to install the magnet bushing assembly.

[0050] Figure 7 It is along Figure 6 Schematic diagram of the cross section of the middle BB line;

[0051] Figure 8 This is a three-dimensional structural diagram of the tooling used to install the auxiliary bearing bushing in this application;

[0052] Figure 9 yes Figure 8 The diagram shows the planar structure of the assembly tooling when installing the auxiliary bearing bushing.

[0053] Figure 10 It is along Figure 9 A cross-sectional view of the middle CC line;

[0054] Figure 11 This is a three-dimensional structural diagram of the pressure plate and connecting plate in this application;

[0055] Figure 12 This is a three-dimensional structural diagram of the drive unit in this application;

[0056] Figure 13 This is a three-dimensional structural schematic diagram of the auxiliary bearing bushing in this application;

[0057] Figure 14 This application provides a flowchart of the assembly method for the rotating part of the electromagnetic bearing.

[0058] Explanation of reference numerals in the attached drawings: 1. Tooling bushing; 2. Extrusion assembly; 21. Pressure plate; 211. First connecting hole; 212. Hollowed-out part; 213. Boss; 22. Connecting plate; 221. Second connecting hole; 23. Connecting assembly; 231. Connecting rod; 232. Limiting part; 3. Drive part; 31. Rotating part; 4. Rotating shaft; 5. Target bushing; 6. Magnet bushing assembly; 61. First end plate; 62. Second end plate; 63. Locking assembly; 631. Locking rod; 632. Locking part; 64. Silicon steel sheet; 7. Auxiliary bearing bushing; 71. First part; 72. Second part; 8. Impeller threaded tie rod. Detailed Implementation

[0059] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "up," "down," "left," and "right" generally refer to up, down, left, and right in the actual use or working state of the device, specifically the drawing directions in the accompanying drawings.

[0060] In this application, unless otherwise expressly specified and limited, the terms "connected," "linked," "stacked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0061] This application provides an assembly fixture and assembly method for an electromagnetic bearing rotating component, which are described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0062] Reference Figure 1 One embodiment of this application provides an assembly fixture for an electromagnetic bearing rotating component. The assembly fixture for the electromagnetic bearing rotating component is used to install the electromagnetic bearing rotating component. The assembly fixture for the electromagnetic bearing rotating component includes a fixture bushing 1, a pressing assembly 2, and a driving part 3.

[0063] Please refer to the details as well. Figures 2 to 10 The electromagnetic bearing rotating component includes a target bushing 5, a magnet bushing assembly 6, and an auxiliary bearing bushing 7, which are sequentially mounted on the rotating shaft 4. Each of these components has a through hole and is fitted onto corresponding positions on the rotating shaft 4, coaxially with the shaft. The tooling bushing 1 and the pressing assembly 2 also have through holes. When these components are fitted onto the rotating shaft 4, they are all coaxially aligned with the shaft. During assembly, the tooling is coaxial with the rotating shaft 4 to ensure that the tooling applies axial pressure to the electromagnetic bearing rotating component, thereby ensuring a high degree of coaxiality between the electromagnetic bearing rotating component and the rotating shaft 4.

[0064] Due to the high rotational speed of the turbine, to ensure that the rotating components of the electromagnetic bearing do not loosen during operation, they are typically heat-fitted onto the rotating shaft 4 with a large interference fit. However, the temperature drop during the heat fitting process can cause the rotating components of the electromagnetic bearing to shrink, resulting in a deviation in their relative position on the rotating shaft 4. During the assembly of the rotating components of the electromagnetic bearing, the tooling sleeve 1 can be fitted onto the rotating shaft 4 and abut against the target sleeve 5. The pressing assembly 2 can at least partially be fitted onto the rotating shaft 4 and abut against the magnet sleeve assembly 6 or the auxiliary bearing sleeve 7. The drive unit 3 is used to apply axial pressure to the tooling sleeve 1 and / or the pressing assembly 2, thereby transmitting the axial pressure to the corresponding target sleeve 5, magnet sleeve assembly 6, and auxiliary bearing sleeve 7. During the cooling process of the target sleeve 5, magnet sleeve assembly 6, and auxiliary bearing sleeve 7, they can continuously be subjected to axial pressure.

[0065] In this embodiment, refer to Figures 2 to 4 When the target bushing 5 is installed, the driving unit 3 applies axial pressure to the extrusion assembly 2, which then transmits the axial pressure to the tooling bushing 1. The tooling bushing 1 then applies the axial pressure to the target bushing 5. (Refer to...) Figures 5 to 7 When installing the magnet bushing assembly 6, the driving unit 3 applies axial pressure to the extrusion assembly 2, and the extrusion assembly 2 applies axial pressure to the magnet bushing assembly 6. (Refer to...) Figures 8 to 10 When the auxiliary bearing bushing 7 is installed, the axial pressure of the extrusion assembly 2 is applied to the auxiliary bearing bushing 7 by the extrusion unit 3.

[0066] Reference Figure 4 , Figure 7 and Figure 10 One end of the rotating shaft 4 can be provided with an impeller threaded rod 8. A portion of the extrusion assembly 2 can be fitted around the outer periphery of the impeller threaded rod 8, and the extrusion assembly 2 can move axially relative to the impeller threaded rod 8. The drive unit 3 is located on the side of the extrusion assembly 2 facing away from the electromagnetic bearing rotating component and abuts against the extrusion assembly 2. The drive unit 3 is, for example, a locking nut. The drive unit 3 has an internal thread (not shown), and the impeller threaded rod 8 has an external thread (not shown). The internal thread of the drive unit 3 and the external thread of the impeller threaded rod 8 cooperate with each other, and axial pressure is applied to the extrusion assembly 2 by rotating the drive unit 3. For example, when the drive unit 3 moves towards the electromagnetic bearing rotating component, the axial pressure applied by the rotating drive unit 3 to the extrusion assembly 2 increases, and vice versa. In some embodiments, the drive unit 3 can also be a component such as a cylinder, which can directly apply axial pressure to the extrusion assembly 2.

[0067] The drive unit 3, impeller threaded tie rod 8, and rotating shaft 4 are coaxially arranged. Thus, the axial pressure is provided by the drive unit 3, which is located on the centerline of the rotating shaft 4. The axial pressure is evenly distributed circumferentially between the tooling bushing 1 and the extrusion assembly 2, thereby ensuring a uniform circumferential distribution of the axial pressure on the rotating part of the electromagnetic bearing and guaranteeing a high degree of coaxiality between the rotating part of the electromagnetic bearing and the rotating shaft 4. In this embodiment, the drive unit 3 is a locking nut. Compared to a cylinder, the locking nut provides better coaxiality with the impeller threaded tie rod 8 and the rotating shaft 4, thereby ensuring a uniform circumferential distribution of the axial pressure and guaranteeing a high degree of coaxiality between the rotating part of the electromagnetic bearing and the rotating shaft 4. A rotating part 31 (e.g., ...) can be provided on the outer circumferential surface of the drive unit 3. Figure 13 As shown, the rotating part 31 can be hexagonal in shape, which facilitates wrench operation.

[0068] In this application, during the heat-shrinking cooling process of the rotating component of the electromagnetic bearing, axial pressure is continuously applied to the rotating component using an assembly fixture. This solves the assembly defects that occur during the heat-shrinking cooling process. It not only ensures that the relative position of the rotating component and the rotating shaft 4 remains unchanged, providing assembly accuracy, but also ensures that the silicon steel sheets 64 are always tightly stacked, thereby ensuring the performance and reliability of the electromagnetic bearing. Furthermore, the assembly fixture has a reasonable structural design, and the components are easy to install and disassemble. This assembly fixture can be used for the heat-shrinking assembly of multiple components of the rotating component of the electromagnetic bearing, exhibiting good versatility, reducing the types of assembly fixtures, and lowering costs. During the assembly process, except for the heat-shrinking operation, personnel do not need to directly contact high-temperature components, reducing the risk of burns and ensuring the safety of operators.

[0069] In one specific implementation, refer to Figure 4 The outer diameter of the tooling sleeve 1 can match the outer diameter of the target sleeve 5, that is, the outer diameter of the tooling sleeve 1 is the same as or approximately the same as the outer diameter of the target sleeve 5, to ensure that the target sleeve 5 is subjected to uniform axial pressure. The inner diameter of the tooling sleeve 1 can be larger than the inner diameter of the target sleeve 5. For example, the difference between the inner diameter of the tooling sleeve 1 and the inner diameter of the target sleeve 5 is 0.05mm to 0.15mm. This ensures that the tooling sleeve 1 and the rotating shaft 4 have a high degree of coaxiality, and at the same time facilitates the fitting of the tooling sleeve 1 onto or from the rotating shaft 4, thereby improving the convenience of operation.

[0070] Reference Figure 1 , Figure 4 , Figure 7 and Figure 10The extrusion assembly 2 may include a pressure plate 21, a connecting plate 22, and a connecting assembly 23 connecting the pressure plate 21 and the connecting plate 22. The pressure plate 21 is disposed away from the drive unit 3, and the connecting plate 22 is disposed adjacent to the drive unit 3. The connecting plate 22 can be sleeved on the impeller threaded tie rod 8. The inner diameter of the connecting plate 22 is preferably larger than the outer diameter of the impeller threaded tie rod 8, and part of the impeller threaded tie rod 8 extends to the side of the connecting plate 22 facing away from the pressure plate 21. The drive unit 3 is disposed on the side of the connecting plate 22 facing away from the pressure plate 21 and abuts against the connecting plate 22. The drive unit 3 can apply axial pressure to the connecting plate 22 and transmit the axial pressure to the pressure plate 21 through the connecting assembly 23. The pressure plate 21 and the connecting plate 22 are spaced apart so that the extrusion assembly 2 has a certain length in the axial direction. This ensures that the pressure plate 21 can reach different positions on the rotating shaft 4 and can contact the electromagnetic bearing rotating parts located at different positions on the rotating shaft 4. It is also suitable for installing electromagnetic bearing rotating parts of different lengths on rotating shafts 4 of different lengths.

[0071] Reference Figure 11 The pressure plate 21 is provided with a first connecting hole 211, and the connecting plate 22 is provided with a second connecting hole 221 corresponding to the first connecting hole 211. Please refer to both. Figure 1 The connecting assembly 23 may include a connecting rod 231 and a limiting member 232. The connecting rod 231 may be, for example, a stud, and the limiting member 232 may be, for example, a nut, such as a hexagonal nut. Both the stud and the hexagonal nut may be standard fasteners. There are multiple first connecting holes 211 and multiple second connecting holes 221, for example, four first connecting holes 211 and four second connecting holes 221. The multiple first connecting holes 211 are evenly distributed along the circumference of the pressure plate 21 and are preferably located near the outer edge of the pressure plate 21. The multiple second connecting holes 221 are evenly distributed along the circumference of the connecting plate 22 and are preferably located near the outer edge of the connecting plate 22, thereby ensuring that the axial pressure can be transmitted evenly.

[0072] Reference Figure 1 , Figure 4 and Figure 11One end of the connecting rod 231 can be fixedly connected to one of the first connecting hole 211 and the second connecting hole 221, and the other end of the connecting rod 231 can be movably connected to the other of the first connecting hole 211 and the second connecting hole 221. A limiting member 232 can be disposed between the connecting rod 231 and the pressure plate 21 and the connecting plate 22, and the axial distance between the pressure plate 21 and the connecting plate 22 on the rotation axis 4 can be adjusted by adjusting the position of the limiting member 232. As an example, one end of the connecting rod 231 is fixedly connected to the first connecting hole 211, for example, by a threaded connection, and the other end of the connecting rod 231 is movably connected to the second connecting hole 221. The limiting member 232 is disposed on the side of the connecting plate 22 facing away from the driving part 3 and can abut against the connecting plate 22. When the driving part 3 applies axial pressure to the connecting plate 22, the limiting member 232 can restrict the movement of the connecting plate 22 along the connecting rod 231, ensuring that the distance between the connecting plate 22 and the pressure plate 21 remains constant.

[0073] In another embodiment, the connecting assembly 23 may include a connecting rod 231, the two ends of which can be threadedly connected to the first connecting hole 211 and the second connecting hole 221, respectively. By rotating the connecting rod 231, the axial distance between the pressure plate 21 and the connecting plate 22 on the rotation axis 4 can be adjusted. For example, the connecting rod 231 is a double-ended stud, with threads at both ends. By rotating the connecting rod 231, the pressure plate 21 and the connecting plate 22 can be moved closer to or further apart.

[0074] Reference Figure 1 , Figure 5 , Figure 7 and Figure 11The pressure plate 21 may have a hollow portion 212 to provide clearance space. The outer diameter of the pressure plate 21 is larger than the outer diameter of the magnetic steel bushing assembly 6. The magnetic steel bushing assembly 6 includes multiple silicon steel sheets 64 and a first end plate 61 and a second end plate 62 disposed at both ends of the magnetic steel bushing assembly 6. The first end plate 61 and the second end plate 62 are connected by a locking assembly 63 to apply clamping force to the multiple silicon steel sheets 64, especially when the magnetic steel bushing assembly 6 undergoes thermal expansion and contraction, thereby preventing the multiple silicon steel sheets 64 from loosening. The locking assembly 63 may include a locking rod 631 and a locking element 632. The locking rod 631 is, for example, a stud, and the locking element 632 is, for example, a nut, such as a hexagonal nut. Both the stud and the hexagonal nut can be standard fasteners. As an example, the locking rod 631 is a double-ended stud, with threads at both ends. The locking rod 631 is movably connected to both the first end plate 61 and the second end plate 62. Both ends of the locking rod 631 pass through the first end plate 61 and the second end plate 62, respectively. Locking members 632 are respectively disposed at both ends of the locking rod 631, and abut against the side of the first end plate 61 facing away from the silicon steel sheet 64 and the side of the second end plate 62 facing away from the silicon steel sheet 64, respectively. The clamping force of the first end plate 61 and the second end plate 62 on the silicon steel sheet 64 is controlled by rotating the locking members 632. Since the locking rod 631 is movably connected to both the first end plate 61 and the second end plate 62, when the extrusion assembly 2 applies axial pressure to the magnetic steel bushing assembly 6, the first end plate 61 and the second end plate 62 can move closer to each other to ensure that the silicon steel sheet 64 is subjected to axial pressure, thereby ensuring that the silicon steel sheet 64 is always tightly stacked. Furthermore, when the extrusion assembly 2 applies axial pressure to the magnetic steel bushing assembly 6, the end of the locking member 631 near the pressure plate 21 can be located in the hollowed-out portion 212 to avoid interference.

[0075] Reference Figure 10 and Figure 12 The auxiliary bearing bushing 7 can be divided into a first part 71 and a second part 72. The first part 71 is positioned close to the magnet bushing assembly 6 relative to the second part 72. The outer diameter of the first part 71 is larger than the outer diameter of the second part 72. The inner diameter of the pressure plate 21 is greater than or equal to the outer diameter of the second part 72. The inner diameter of the pressure plate 21 is smaller than the outer diameter of the first part 71. The pressure plate 21 can be fitted onto the second part 72 and abut against the side of the first part 71 facing away from the magnet bushing assembly 6.

[0076] Reference Figure 1 , Figure 10 , Figure 11 and Figure 12A boss 213 may be provided on the side of the pressure plate 21 facing away from the connecting plate 22. The boss 213 extends from the pressure plate 21 toward the first part 71. The boss 213 may be annular in shape, and its inner diameter may be the same as that of the pressure plate 21. The boss 213 can abut against the side of the first part 71 facing away from the magnet bushing assembly 6. The outer diameter of the boss 213 is the same as or approximately the same as that of the first part 71 to ensure that the boss 213 can apply a more uniform axial pressure to the first part 71.

[0077] Reference Figure 14 An embodiment of this application also provides an assembly method for an electromagnetic bearing rotating component, using any of the above-mentioned assembly fixtures, including: steps S1-S3.

[0078] Step S1: Install the target bushing 5 at the predetermined position of the rotating shaft 4, and apply axial pressure to the target bushing 5 using the assembly tool.

[0079] Specifically, refer to Figures 2 to 4 Step S1 includes steps S11-S14.

[0080] Step S11: Heat the target sleeve 5 to a predetermined temperature. The target sleeve 5 expands due to heat, and its inner diameter can increase. The thermal expansion of the target sleeve 5 is sufficient to meet the interference fit requirements, making it easy to install the target sleeve 5 onto the rotating shaft 4. The preheating temperature is, for example, 300±20℃, but other temperatures are also possible and can be set according to actual needs.

[0081] Before step S11, the following steps are also included: installing the impeller threaded tie rod 8 on the rotating shaft 4, connecting the pressure plate 21 and the connecting plate 22 with the connecting rod 231 and the limiting member 232 to form the extrusion assembly 2, and adjusting the distance between the pressure plate 21 and the connecting plate 22 according to the shaft length and the installation position of the target bushing 5, and adjusting it through the limiting member 232.

[0082] Step S12: Install the target sleeve 5 at the predetermined position on the rotating shaft 4.

[0083] Step S13: The tooling bushing 1 and the extrusion assembly 2 are sequentially fitted onto the rotating shaft 4. One end of the tooling bushing 1 is in contact with the target bushing 5. The drive unit 3 is engaged with the impeller threaded tie rod 8. The drive unit 3 applies axial pressure to the extrusion assembly 2. The extrusion assembly 2 transmits the axial pressure to the tooling bushing 1 so that the tooling bushing 1 applies axial pressure to the target bushing 5.

[0084] Step S14: Wait for the target sleeve 5 to cool to a predetermined temperature, such as room temperature. The target sleeve 5 will shrink as it cools, and the inner diameter of the target sleeve 5 can become smaller so that the target sleeve 5 can fit tightly with the rotating shaft 4.

[0085] As a preferred method, while waiting for the target bushing 5 to cool down, the locking status of the drive unit 3 is checked. For example, the drive unit 3 can be tightened periodically with a wrench to ensure that the target bushing 5 is continuously subjected to axial pressure during the cooling process. A torque wrench can be selected to precisely control the tightening torque of the drive unit 3, thereby ensuring the stability of the axial pressure.

[0086] After the target bushing 5 has cooled to the predetermined temperature, the drive unit 3, the extrusion assembly 2 and the tooling bushing 1 are removed in sequence to complete the installation of the target bushing 5.

[0087] Step S2: Install the magnet bushing assembly 6 at the predetermined position of the rotating shaft 4, and apply axial pressure to the magnet bushing assembly 6 using the assembly tooling.

[0088] Specifically, refer to Figures 5 to 7 Step S2 includes steps S21-S24.

[0089] Step S21: Heat the magnet bushing assembly 6 to a predetermined temperature. The preheating temperature must be lower than the demagnetization critical temperature of the magnet bushing assembly 6. The magnet bushing assembly 6 expands due to heat, and its inner diameter can increase. The thermal expansion of the magnet bushing assembly 6 is sufficient to meet the interference fit requirements, facilitating the installation of the magnet bushing assembly 6 onto the rotating shaft 4. The preheating temperature is, for example, 300±20℃, but other temperatures can also be used, depending on actual needs.

[0090] Before step S21, the distance between the pressure plate 21 and the connecting plate 22 is adjusted appropriately according to the shaft length and the installation position of the magnet bushing assembly 6, and is adjusted by the limiting member 232.

[0091] Step S22: Install the magnet bushing assembly 6 at the predetermined position on the rotating shaft 4.

[0092] Step S23: The extrusion assembly 2 is fitted onto the rotating shaft 4, the pressure plate 21 and the magnet bushing assembly 6 are in contact with each other, and the drive part 3 cooperates with the impeller threaded rod 8 so that the extrusion assembly 2 applies axial pressure to the magnet bushing assembly 6.

[0093] Step S24: Wait for the magnet bushing assembly 6 to cool to a predetermined temperature, such as room temperature. As the magnet bushing assembly 6 cools and shrinks, the inner diameter of the magnet bushing assembly 6 can become smaller so that the magnet bushing assembly 6 can fit tightly with the rotating shaft 4.

[0094] As a preferred method, while waiting for the magnet bushing assembly 6 to cool down, the locking status of the drive unit 3 is checked. For example, the drive unit 3 can be tightened periodically with a wrench to ensure that the magnet bushing assembly 6 is continuously subjected to axial pressure during the cooling process. A torque wrench can be selected to precisely control the tightening torque of the drive unit 3, thereby ensuring the stability of the axial pressure.

[0095] After the magnet bushing assembly 6 has cooled to a predetermined temperature, the drive unit 3 and the pressing assembly 2 are removed in sequence to complete the installation of the magnet bushing assembly 6. In some embodiments, the second end plate 62 and the locking assembly 63 of the magnet bushing assembly 6 can also be removed together.

[0096] Step S3: Install the auxiliary bearing sleeve 7 at the predetermined position of the rotating shaft 4, and apply axial pressure to the auxiliary bearing sleeve 7 using the assembly tool.

[0097] Specifically, refer to Figures 8 to 10 Step S3 includes steps S31-S34.

[0098] Step S31: Heat the auxiliary bearing sleeve 7 to a predetermined temperature. The auxiliary bearing sleeve 7 expands due to heat, and its inner diameter can increase. The thermal expansion of the auxiliary bearing sleeve 7 is sufficient to meet the interference fit requirements, making it easy to install the auxiliary bearing sleeve 7 onto the rotating shaft 4. The preheating temperature is, for example, 300±20℃, but other temperatures can also be used, which can be set according to actual needs.

[0099] Before step S31, the distance between the pressure plate 21 and the connecting plate 22 is adjusted appropriately according to the shaft length and the installation position of the auxiliary bearing bushing 7, and is adjusted by the limiting member 232.

[0100] Step S32: Install the auxiliary bearing bushing 7 at the predetermined position on the rotating shaft 4.

[0101] Step S33: The extrusion assembly 2 is fitted onto the rotating shaft 4. The boss 213 on the pressure plate 21 contacts the first part 71 of the auxiliary bearing bush 7. The drive part 3 cooperates with the impeller threaded rod 8 so that the extrusion assembly 2 applies axial pressure to the auxiliary bearing bush 7.

[0102] Step S34: Wait for the auxiliary bearing sleeve 7 to cool to a predetermined temperature, such as room temperature. As the auxiliary bearing sleeve 7 cools and shrinks, its inner diameter can become smaller, so that the auxiliary bearing sleeve 7 can fit tightly with the rotating shaft 4.

[0103] As a preferred method, while waiting for the auxiliary bearing sleeve 7 to cool down, the locking status of the drive unit 3 is checked. For example, the drive unit 3 can be tightened periodically with a wrench to ensure that the auxiliary bearing sleeve 7 is continuously subjected to axial pressure during the cooling process. A torque wrench can be selected to precisely control the tightening torque of the drive unit 3, thereby ensuring the stability of the axial pressure.

[0104] After the auxiliary bearing bushing 7 has cooled to the predetermined temperature, the drive unit 3 and the extrusion assembly 2 are removed in sequence to complete the installation of the auxiliary bearing bushing 7.

[0105] The above provides a detailed description of the assembly fixture and assembly method for an electromagnetic bearing rotating component provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An assembly fixture for a rotating component of an electromagnetic bearing, characterized in that, The electromagnetic bearing rotating component includes a target bushing (5), a magnet bushing assembly (6), and an auxiliary bearing bushing (7) sequentially mounted on the rotating shaft (4). The assembly fixture includes a tooling bushing (1), a pressing assembly (2), and a drive unit (3). The tooling bushing (1) can be fitted onto the rotating shaft (4) and abut against the target bushing (5). The pressing assembly (2) can at least partially be fitted onto the rotating shaft (4) and abut against the magnet bushing assembly (6) or the auxiliary bearing bushing (7). The drive unit (3) is used to apply axial pressure to the tooling bushing (1) and / or the pressing assembly (2). The assembly fixture is configured to continuously apply axial pressure to the target bushing (5), the magnet bushing assembly (6), and the auxiliary bearing bushing (7) during the cooling process after the target bushing (5), the magnet bushing assembly (6), and the auxiliary bearing bushing (7) are heat-fitted onto the rotating shaft (4).

2. The assembly fixture according to claim 1, characterized in that, The outer diameter of the tooling bushing (1) matches the outer diameter of the target bushing (5), and the inner diameter of the tooling bushing (1) is greater than the inner diameter of the target bushing (5).

3. The assembly fixture according to claim 1, characterized in that, The extrusion assembly (2) includes a pressure plate (21), a connecting plate (22), and a connecting assembly (23) connecting the pressure plate (21) and the connecting plate (22). The pressure plate (21) is disposed away from the driving part (3), and the connecting plate (22) is disposed adjacent to the driving part (3).

4. The assembly fixture according to claim 3, characterized in that, The connecting assembly (23) includes a connecting rod (231) and a limiting member (232). The pressure plate (21) is provided with a first connecting hole (211), and the connecting plate (22) is provided with a second connecting hole (221) corresponding to the first connecting hole (211). One end of the connecting rod (231) is fixedly connected to one of the first connecting hole (211) and the second connecting hole (221), and the other end of the connecting rod (231) is movably connected to the other of the first connecting hole (211) and the second connecting hole (221). The limiting member (232) is located between the pressure plate (21) and the connecting plate (22) and the connecting rod (231). By adjusting the position of the limiting member (232), the axial distance between the pressure plate (21) and the connecting plate (22) on the rotating shaft (4) can be adjusted; or... The connecting assembly (23) includes a connecting rod (231), the two ends of which are threaded to the first connecting hole (211) and the second connecting hole (221) respectively. By rotating the connecting rod (231), the distance between the pressure plate (21) and the connecting plate (22) in the axial direction of the rotating shaft (4) can be adjusted.

5. The assembly fixture according to claim 4, characterized in that, There are multiple first connecting holes (211) and multiple second connecting holes (221). The multiple first connecting holes (211) are evenly distributed along the circumference of the pressure plate (21), and the multiple second connecting holes (221) are evenly distributed along the circumference of the connecting plate (22).

6. The assembly fixture according to claim 3, characterized in that, The pressure plate (21) is provided with a hollow part (212), which is used to provide clearance space. The outer diameter of the pressure plate (21) is larger than the outer diameter of the magnet bushing assembly (6).

7. The assembly fixture according to claim 3, characterized in that, The auxiliary bearing bushing (7) is divided into a first part (71) and a second part (72). The first part (71) is positioned close to the magnet bushing assembly (6) relative to the second part (72). The outer diameter of the first part (71) is larger than the outer diameter of the second part (72). The pressure plate (21) can be fitted onto the second part (72) and abut against the first part (71).

8. The assembly fixture according to claim 7, characterized in that, The pressure plate (21) has a boss (213) on the side facing away from the connecting plate (22). The inner diameter of the boss (213) is the same as the inner diameter of the pressure plate (21). The boss (213) can abut against the side of the first part (71) facing away from the magnet bushing assembly (6).

9. The assembly fixture according to claim 3, characterized in that, One end of the rotating shaft (4) is provided with an impeller threaded rod (8), the connecting plate (22) is sleeved on the impeller threaded rod (8), the driving part (3) is provided on the side of the connecting plate (22) facing away from the pressure plate (21) and abuts against the connecting plate (22), the driving part (3) is a locking nut, the internal thread of the driving part (3) and the external thread of the impeller threaded rod (8) cooperate with each other, and the axial pressure is applied to the extrusion assembly (2) by rotating the driving part (3).

10. The assembly fixture according to claim 9, characterized in that, The drive unit (3), the impeller threaded rod (8), and the rotating shaft (4) are coaxially arranged.

11. The assembly fixture according to claim 9, characterized in that, The outer peripheral surface of the drive unit (3) is provided with a rotating part (31), which has a hexagonal structure.

12. A method for assembling a rotating component of an electromagnetic bearing, using the assembly fixture described in any one of claims 1-11, characterized in that, The assembly method includes: The target bushing (5) is installed at a predetermined position on the rotating shaft (4), and axial pressure is applied to the target bushing (5) by the assembly fixture; The magnet bushing assembly (6) is installed at a predetermined position on the rotating shaft (4), and axial pressure is applied to the magnet bushing assembly (6) by the assembly fixture; The auxiliary bearing bushing (7) is installed at a predetermined position on the rotating shaft (4), and axial pressure is applied to the auxiliary bearing bushing (7) by the assembly fixture.

13. The assembly method according to claim 12, characterized in that, The step of installing the target bushing (5) at a predetermined position on the rotating shaft (4) and applying axial pressure to the target bushing (5) through the assembly fixture includes: The target bushing (5) is heated to a predetermined temperature; Install the target bushing (5) at a predetermined position on the rotating shaft (4); The tooling bushing (1) and the extrusion assembly (2) are sequentially fitted onto the rotating shaft (4), and the drive unit (3) cooperates with the impeller threaded tie rod (8) so that the tooling bushing (1) applies axial pressure to the target bushing (5); Wait for the target bushing (5) to cool to the predetermined temperature; The step of installing the magnet bushing assembly (6) at a predetermined position on the rotating shaft (4) and applying axial pressure to the magnet bushing assembly (6) using the assembly fixture includes: The magnet bushing assembly (6) is heated to a predetermined temperature; The magnet bushing assembly (6) is installed at a predetermined position on the rotating shaft (4); The extrusion assembly (2) is sleeved on the rotating shaft (4), and the drive unit (3) cooperates with the impeller threaded rod (8) so that the extrusion assembly (2) applies axial pressure to the magnet bushing assembly (6); Wait for the magnet bushing assembly (6) to cool to the predetermined temperature; The step of installing the auxiliary bearing sleeve (7) at a predetermined position on the rotating shaft (4) and applying axial pressure to the auxiliary bearing sleeve (7) using the assembly fixture includes: The auxiliary bearing bushing (7) is heated to a predetermined temperature; The auxiliary bearing bushing (7) is installed at a predetermined position on the rotating shaft (4); The extrusion assembly (2) is fitted onto the rotating shaft (4), and the drive unit (3) cooperates with the impeller threaded tie rod (8) so that the extrusion assembly (2) applies axial pressure to the auxiliary bearing bushing (7); Wait for the auxiliary bearing bush (7) to cool to the predetermined temperature.

14. The assembly method according to claim 13, characterized in that, The step of waiting for the target bushing (5) to cool to a predetermined temperature further includes: checking the locking status of the drive unit (3) while waiting for the target bushing (5) to cool; After the target bushing (5) is cooled to a predetermined temperature, the drive unit (3), the extrusion assembly (2) and the tooling bushing (1) are removed in sequence. The step of waiting for the magnet bushing assembly (6) to cool down to a predetermined temperature further includes: checking the locking status of the drive unit (3) while waiting for the magnet bushing assembly (6) to cool down; After the magnet bushing assembly (6) is cooled to a predetermined temperature, the drive unit (3) and the extrusion assembly (2) are removed in sequence; The step of waiting for the auxiliary bearing bushing (7) to cool down to a predetermined temperature further includes: checking the locking status of the drive unit (3) while waiting for the auxiliary bearing bushing (7) to cool down; After the auxiliary bearing bushing (7) is cooled to a predetermined temperature, the drive unit (3) and the extrusion assembly (2) are removed in sequence.

Images