Sealed bearing device suitable for magnetic suspension motor

Abstract

The utility model discloses a sealed bearing device suitable for a magnetic suspension motor, which comprises a rotor, a motor, a radial magnetic suspension bearing and an axial magnetic suspension bearing, one end or two ends of the rotor is / are also provided with the sealed bearing device, the sealed bearing device is composed of a bearing and a sealing element, the sealing element comprises a moving ring arranged on the rotor, and the moving ring is arranged on the motor. The utility model relates to a magnetic suspension motor sealing structure, which comprises a shell, a movable ring and a fixed ring which are arranged on the shell, a suspension column is assembled between the movable ring and the fixed ring, an axial gap and a radial gap are formed among the movable ring, the fixed ring and the suspension column, and the axial gap and the radial gap meet the requirements of axial and radial displacement spaces of a rotor. The sealing structure is mainly composed of a movable ring, a static ring and a suspension column, an axial gap T and a radial gap A exist between the movable ring and the suspension column, conversion from kinetic energy to heat energy is achieved through the impact effect of fluid in a flow channel, and then the sealing function is achieved. The axial and radial gaps of the sealing structure can just meet the requirements of the magnetic suspension main shaft on the axial and radial gaps.

Description

Technical Field

[0001] This utility model belongs to the technical field, specifically relating to a sealed bearing device suitable for magnetic levitation motors. Background Technology

[0002] Compared to traditional rolling bearings, sliding bearings, and oil film bearings, magnetic levitation bearings do not have direct mechanical contact, such as... Figure 1 As shown, the frictionless design of magnetic levitation bearings can significantly reduce wear. Since the motor spindle is made of magnetic material or contains magnetic material in some parts, after the motor starts, the radial magnetic bearing generates a magnetic field parallel to the axis normal. This magnetic field controls the spindle position on the central axis, lifting it from the protective bearing support state to a suspended state, thus removing it from mechanical contact. The axial magnetic bearing generates a magnetic field parallel to the axis direction. At this time, the magnetic material near the axial magnetic bearing is subjected to magnetic force, maintaining the spindle in a stable axial position and reducing axial displacement caused by vibration and other factors.

[0003] However, its efficient operation also requires appropriate sealing technology to prevent damage to the bearing cavity and other internal components from harsh external environments. On the one hand, existing magnetic levitation bearings do not have a sealing function; on the other hand, due to factors such as magnetic force intermittency, vibration, and changes in external load, the motor requires the main shaft to retain axial and radial displacement space, meaning that the main shaft of the magnetic levitation bearing motor has a large radial displacement. a and axial displacement t Existing sealing technologies cannot meet the displacement requirements in both directions. This special working condition makes it impossible to use existing sealing technologies in combination, resulting in a lack of technical solutions to address the problems of sealing, dustproofing, waterproofing, and explosion-proofing under complex working conditions of magnetic levitation bearings. Summary of the Invention

[0004] Based on the technical problems existing in the background technology, a sealed bearing device suitable for magnetic levitation motors is proposed.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A sealed bearing device suitable for a magnetic levitation motor includes a rotor, a motor, a radial magnetic levitation bearing, and an axial magnetic levitation bearing. The device is characterized in that: a sealed bearing device is installed at one or both ends of the rotor. The sealed bearing device consists of a bearing and a seal. The seal includes a rotating ring mounted on the rotor and a stationary ring mounted on a housing. A suspension column is assembled between the rotating ring and the stationary ring. An axial clearance and a radial clearance are formed between the rotating ring, the stationary ring, and the suspension column. The axial clearance and radial clearance meet the axial and radial displacement space requirements of the rotor. The inner and outer diameters of the bearing are connected to the rotating ring and the stationary ring, respectively.

[0007] Furthermore, the rotating ring is fixed to the rotor by set screws and rotates with the rotor, while the stationary ring is fixed to the support sleeve by bolts, and the support sleeve is connected to the outer shell.

[0008] Furthermore, several layers of suspension mounting holes are provided between the moving ring and the stationary ring.

[0009] Furthermore, the suspension mounting hole of the stationary ring is threaded, and one end of the suspension is designed to be threaded accordingly. The suspension is screwed into the suspension mounting hole of the stationary ring through the thread.

[0010] Furthermore, the bearing inner diameter and the rotating ring are interference-fitted, allowing them to rotate together during operation, while the bearing outer diameter and the stationary ring are interference-fitted, keeping them stationary during operation.

[0011] The above technical solution can achieve the following beneficial effects:

[0012] The sealing structure (sealant) of this invention can meet the axial and radial displacement requirements of the main shaft (rotor) of a magnetic levitation motor. The sealing structure mainly consists of dynamic and static rings and a suspension column, with an axial clearance between the dynamic and static rings and the suspension column. T and radial clearance A The kinetic energy is converted into thermal energy through the impact of the fluid in the flow channel, thereby achieving the sealing function. The axial and radial clearances of the sealing structure itself can also meet the axial and radial clearance requirements of the magnetic levitation spindle (i.e., T ≥ t, A ≥ a Numerical calculations further confirm that this patented technology can meet the sealing, dustproof, waterproof, and explosion-proof requirements of magnetic levitation bearing motors. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of an existing magnetic levitation bearing.

[0014] Figure 2 This is a structural diagram of the bearing of a magnetic levitation motor.

[0015] Figure 3 This is a structural diagram of a sealed bearing assembly.

[0016] Figure 4 This is a structural diagram of the sealing component.

[0017] Figure 5 This is a schematic diagram of radial limit displacement.

[0018] Figure 6 This is a schematic diagram of the axial limit displacement.

[0019] Figure 7 This is a schematic diagram of the circumferential dimensions of the thread.

[0020] Figure 8 This is a schematic diagram of the threaded stationary ring of the suspension column.

[0021] In the picture:

[0022] In the diagram: 1. Motor; 2. Radial magnetic levitation bearing; 3. Axial magnetic levitation bearing; 4. Sealed bearing assembly; 5. Housing; 6. Rotor; 7. Bearing; 8. Suspension column; 9. Stationary ring; 10. Moving ring; 11. Set screw. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings:

[0024] like Figure 2 As shown, a sealed bearing device suitable for a magnetic levitation motor includes a rotor 6, a motor 1, a radial magnetic levitation bearing 2, and an axial magnetic levitation bearing 3. A sealed bearing device 4 is also installed at one or both ends of the rotor. The sealed bearing device consists of a bearing 7 and a seal. The seal includes a rotating ring 10 mounted on the rotor and a stationary ring 9 mounted on a housing 5. A suspension column 8 is assembled between the rotating ring and the stationary ring. An axial clearance and a radial clearance are formed between the rotating ring, the stationary ring, and the suspension column, which meet the axial and radial displacement space requirements of the rotor. The inner and outer diameters of the bearings are connected to the rotating and stationary rings, respectively. Specifically, the inner diameter of the bearing and the rotating ring are connected by an interference fit, allowing the inner diameter and the rotating ring to rotate together during operation. The outer diameter of the bearing and the stationary ring remain stationary during operation due to the interference fit.

[0025] In the above structure, the rotating ring is fixed to the rotor by the set screw 11 and rotates with the rotor. The two support sleeves on the outside of the stationary ring are tightened with bolts and press against the motor housing.

[0026] In the above structure, the sealing element specifically adopts an impact sealing structure, that is, there are several layers of suspension mounting holes between the dynamic ring and the stationary ring, the suspension mounting holes of the stationary ring are threaded, one end of the suspension is designed to be threaded, and the suspension is screwed into the suspension mounting hole of the stationary ring through the thread.

[0027] like Figure 2 and Figure 3 The diagram shows the magnetic levitation bearing and seal assembly. The self-impact sealing device's rotating ring is fixed to the main shaft by set screws on the rotating ring and rotates with the main shaft. The stationary ring is bolted to a support sleeve, which is connected to the housing. The support sleeve, together with the bearing, provides support and positioning to ensure their relative position during operation. The suspension column is threaded to the stationary ring, and the sealing gap between the suspension column and the rotating ring allows for the axial and radial displacement required by the magnetic levitation bearing. Figure 5As shown, during the spindle start-up and shutdown phases and when radial displacement occurs during operation, because the stationary ring maintains its original position and a sealing gap exists between the suspension column and the rotating ring, good sealing performance is still maintained even when the rotating ring reaches its maximum radial displacement following the spindle. Figure 6 As shown, when the spindle experiences axial displacement due to factors such as electromagnetic system instability and vibration, the rotating ring still meets the requirements for sealing, dustproofing, waterproofing, and explosion-proofing even when the axial displacement of the rotating ring following the spindle reaches its maximum.

[0028] The self-impact seal features fine threads of the same direction evenly tapped on the inner and outer sides of the cantilever and the inner and outer sides of the stationary ring groove, arranged intermittently at equal angular intervals along the circumference. The circumferential dimension of the threads does not need to be excessive, only sufficient to meet the connection strength requirements. This design ensures normal fluid flow along the circumference, thereby generating impact effects at various levels. Figure 7 and Figure 8 As shown. The suspension column is assembled using fine-pitch threads with the same inner and outer helix direction and pitch. The double-sided fine-pitch threads can meet the thread anti-loosening requirements in environments with minimal vibration. Positioning accuracy is primarily ensured by the thread engagement and shut-off. Simultaneously, the axial and radial clearances of the self-impact sealing channel are designed according to the required axial and radial displacements of the magnetic levitation bearing motor.

[0029] Specific assembly method:

[0030] First, screw the suspension rod into the stationary ring via the threaded connection until the suspension rod is slowly screwed to the bottom of the thread. Assemble the dynamic and stationary rings and other components from left to right according to the self-impact seal assembly steps, and secure the two dynamic rings together with set screws.

[0031] Next, install the seal onto the spindle, tighten the support sleeve on the outside of the stationary ring with bolts and fix it to the motor housing, and finally fix the rotating ring and the spindle with set screws.

[0032] During disassembly, first remove the support sleeve and bolts that fix the stationary ring to the motor housing, then remove the sealing device from the main shaft. Next, disassemble the suspension column on the stationary ring by rotating it through the threaded connection. Disassemble the moving and stationary rings and other components according to the self-impact seal disassembly procedure. Use specialized tools for suspension column disassembly and assembly to prevent excessive deformation of the suspension column, which could affect assembly and positioning accuracy.

[0033] Compared to the wing-shaped self-impact seal (patent number: CN115076374B), this utility model uses a rectangular suspension column, which reduces processing and assembly costs, facilitates the machining of threads on the suspension column and stationary ring, and enables simple and accurate disassembly and positioning of the suspension column.

[0034] Compared to protective bearings that only provide support, this invention ensures the axial and radial displacement space required by the magnetic levitation bearing through its own flow channel gap, thus providing dustproof, waterproof, and explosion-proof functions.

[0035] The sealing performance is unaffected by rotational speed, meeting the requirements of magnetic levitation bearing motors during start-up, shutdown, and high-speed operation. Furthermore, it significantly improves the pressure resistance of magnetic levitation bearing motors and reduces leakage. Under different pressures and speeds, the self-impact sealing device reduces leakage by more than 60% compared to existing magnetic levitation bearings. Numerical calculation results are shown in Table 1.

[0036] Table 1 Comparison of data from the two schemes

[0037]

[0038] The above descriptions are all preferred embodiments of this utility model. For those skilled in the art, any modifications to this utility model in various equivalent forms without departing from the principle of this utility model shall fall within the protection scope of the appended claims.

Claims

1. A sealed bearing device suitable for a magnetic levitation motor, comprising a rotor, a motor, a radial magnetic levitation bearing, and an axial magnetic levitation bearing, characterized in that: A sealed bearing device is also installed at one or both ends of the rotor. The sealed bearing device consists of a bearing and a seal. The seal includes a rotating ring installed on the rotor and a stationary ring installed on the housing. A suspension column is assembled between the rotating ring and the stationary ring. An axial clearance and a radial clearance are formed between the rotating ring, the stationary ring and the suspension column. The axial clearance and the radial clearance meet the axial and radial displacement space requirements of the rotor. The inner and outer diameters of the bearing are connected to the rotating ring and the stationary ring, respectively.

2. A sealed bearing device suitable for magnetic levitation motors according to claim 1, characterized in that: The rotating ring is fixed to the rotor by set screws and rotates with the rotor. The stationary ring is fixed to the support sleeve by bolts. The support sleeve is connected to the outer shell.

3. A sealed bearing device suitable for a magnetic levitation motor according to claim 1, characterized in that: Several layers of suspension column mounting holes are provided between the moving ring and the stationary ring.

4. A sealed bearing device suitable for a magnetic levitation motor according to claim 3, characterized in that: The suspension mounting hole of the stationary ring is threaded, and one end of the suspension is designed to be threaded. The suspension is screwed into the suspension mounting hole of the stationary ring through the thread.

5. A sealed bearing device suitable for a magnetic levitation motor according to claim 1, characterized in that: The bearing inner diameter and the rotating ring are fitted together by an interference fit, allowing them to rotate together during operation. The bearing outer diameter and the stationary ring are fitted together by an interference fit, keeping them stationary during operation.

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