A type of contactless magnetic levitation bearing with the same polarity permanent magnet

Abstract

This invention discloses a co-polar permanent magnet non-contact magnetic levitation bearing, specifically relating to the field of bearing technology. It comprises a left and right half-circle that, when fitted together, form a complete shaft ring. Both the left and right half-circles have coaxial annular grooves in their middle sections, within which rolling elements are arranged. Each rolling element has an annular block at its center, which is embedded within the annular groove formed by the left and right half-circles. The bearing also includes an axial magnetic levitation assembly, a radial magnetic levitation assembly, and a splicing and fixing mechanism. This co-polar permanent magnet non-contact magnetic levitation bearing, through its split shaft ring structure (left and right half-circles joined together) and a splicing and fixing mechanism combining positioning insertion and bolt locking, allows for quick separation of the two half-circles during maintenance without requiring complete disassembly of the shaft system. Only the fastening bolts need to be removed to quickly separate the two half-circles, enabling rapid on-site replacement and maintenance of the rolling elements and internal permanent magnets.

Description

Technical Field

[0001] This invention relates to the field of bearing technology, and in particular to a non-contact magnetic levitation bearing with the same polarity permanent magnet. Background Technology

[0002] Magnetic levitation bearings have been widely used in special working conditions such as high-speed rotation, high-precision transmission, vacuum cleanliness, and high-temperature corrosion due to their advantages of no mechanical contact, low friction, long life and no lubrication.

[0003] Among them, permanent magnet magnetic levitation bearings do not require a complex electromagnetic control system or external power supply. They can achieve levitation support by relying on the principle of like poles repulsion of permanent magnets. They have the characteristics of simple structure, low energy consumption, high reliability and wide applicability, and are ideal support components for small and medium-sized high-speed rotating mechanisms.

[0004] Currently, conventional permanent magnet levitation bearings mostly adopt an integral outer ring structure. Assembly and maintenance require the entire shaft system to be disassembled, which is a cumbersome process with high maintenance costs. It is difficult to meet the needs of rapid on-site inspection and replacement of rolling elements or internal magnets. At the same time, existing structures generally have problems such as uneven distribution of axial and radial levitation forces and insufficient stability of levitation gaps, which can easily lead to swaying and axial movement during rotation, affecting rotational accuracy and load-bearing capacity. Summary of the Invention

[0005] The main objective of this invention is to provide a non-contact magnetic levitation bearing with the same polarity permanent magnet, which can effectively solve the problems mentioned above.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A type of non-contact magnetic levitation bearing with the same polarity includes a left half ring and a right half ring. The left half ring and the right half ring can be fitted together to form a complete shaft ring. The middle of the left half ring and the right half ring are provided with coaxial annular grooves. Rolling elements are provided in the annular grooves. An annular block is provided in the middle of the rolling elements. The annular block is embedded in the annular groove formed by the splicing of the left half ring and the right half ring. It also includes an axial magnetic levitation component, a radial magnetic levitation component, and a splicing and fixing mechanism. The axial magnetic levitation assembly includes multiple sets of magnets, which are respectively fixed to the upper and lower inner walls of the annular groove and the upper and lower end faces of the annular block. The two sets of magnets arranged opposite to the inner walls of the annular groove and the end faces of the annular block have the same magnetism, and the repulsive force of the same pole makes the rolling element and the shaft ring form an axial non-contact gap. The radial magnetic levitation assembly includes a semi-circular magnetic ring one and a semi-circular magnetic ring two. The semi-circular magnetic ring one is fixed to the inner sidewall of the annular groove of the left and right half rings, and the semi-circular magnetic ring two is fixed to the radial outer surface of the rolling element annular block. The semi-circular magnetic ring one and the semi-circular magnetic ring two have the same magnetism, and a radial non-contact gap is formed between the rolling element and the shaft ring through the repulsive force of the same pole. The splicing and fixing mechanism is located between the mating surfaces of the left and right halves of the circle, and is used to coaxially and securely splice the left and right halves of the circle.

[0007] Preferably, the first semicircular magnetic ring is a split structure, with the two semicircular magnetic rings fixed to the inner sidewalls of the annular grooves of the left and right halves of the ring respectively. After the left and right halves of the ring are attached, the two semicircular magnetic rings are joined together to form a complete radial permanent magnet inner ring. The second semi-circular magnetic ring is arranged in a closed loop around the circumference of the rolling annular block to form a radial permanent magnet outer ring; The radial permanent magnet inner ring and the radial permanent magnet outer ring are coaxially arranged, and their radially opposite end faces have the same magnetism.

[0008] Preferably, the splicing and fixing mechanism includes four mounting blocks, four rectangular slots and four fastening bolts. The four mounting blocks are respectively set at the four corners of the left half of the mating surface, and the four rectangular slots are correspondingly opened at the four corners of the right half of the mating surface. The mounting blocks and rectangular slots are matched and inserted one by one. The outer wall of the right half-circle is provided with threaded holes that communicate with four rectangular slots. The four fastening bolts pass through the corresponding threaded holes and are locked in the mounting block to achieve axial and circumferential positioning and fixing of the left and right half-circles.

[0009] Preferably, both ends of the shaft ring formed by the splicing of the left and right halves are provided with an integral sealing and lubrication ring. The inner side of the sealing and lubrication ring is provided with a non-contact labyrinth magnetic sealing section, and the outer side is provided with a contact lip sealing section. The sealing and lubrication ring is provided with a magnetic levitation lubrication cavity. The inner wall of the magnetic levitation lubrication cavity is provided with a magnetic channel that is connected to the magnetic field of the magnet, the first semicircular magnetic ring, and the second semicircular magnetic ring.

[0010] Preferably, the width of the magnetic channel is 0.5mm to 10mm, and the sealing lubrication ring is integrated with the left and right half rings using an interference fit.

[0011] Preferably, the rolling element is a spherical rolling element or a cylindrical rolling element, the annular block is integrally formed with the rolling element, and the outer diameter of the annular block is smaller than the inner diameter of the annular groove formed by splicing the left and right half-circles.

[0012] Preferably, the left half-circle, the right half-circle, the rolling element, and the annular block are all made of non-magnetic stainless steel, and the magnet, the first semi-circular magnetic ring, and the second semi-circular magnetic ring are all neodymium iron boron permanent magnets.

[0013] Preferably, the axial non-contact gap between the magnets disposed opposite to the inner wall of the annular groove and the end face of the annular block, and the radial non-contact gap between the first semicircular magnetic ring and the second semicircular magnetic ring, are both 0.1mm to 2mm.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention employs a split shaft ring structure with a left and right half-ring joined together, coupled with a joint fixing mechanism that combines positioning insertion and bolt locking. During maintenance, there is no need to disassemble the entire shaft system; only the fastening bolts need to be removed to quickly separate the two halves. This allows for rapid on-site replacement and maintenance of the rolling elements and internal permanent magnets. At the same time, the joint fixing mechanism can achieve coaxial positioning of the two halves and dual axial and circumferential limiting, effectively suppressing shaft ring creep wear and fretting displacement. Stable assembly can be achieved without increasing the interference fit, reducing assembly difficulty and internal stress of the shaft ring, and improving the bearing's operational stability.

[0015] 2. This invention employs a magnetic levitation design with axial and radial dual-dimensional repulsion by permanent magnets of the same polarity. In the axial direction, a uniform axial repulsive force is formed by the annular groove and the annular block with opposite magnets of the same polarity. In the radial direction, a uniform circumferential radial support force is formed by the split and assembled inner permanent magnet ring and the closed-loop outer permanent magnet ring. The dual-dimensional stable suspension gap can prevent the rolling element from swaying and moving axially, thereby improving the bearing's rotational accuracy and load-bearing capacity. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural planar schematic diagram of the present invention; Figure 3 This is a partial cross-sectional schematic diagram of the present invention; Figure 4 This is a schematic diagram of the overall structure of the present invention in the form of an explosion. Figure 5 This is a schematic diagram of the assembly and fixing mechanism of the present invention.

[0017] In the diagram: 1. Left half circle; 2. Right half circle; 3. Rolling element; 5. Rectangular groove; 6. Magnet; 7. Semicircular magnetic ring one; 8. Semicircular magnetic ring two; 9. Threaded hole; 10. Fastening bolt; 11. Mounting block. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0019] Example 1, as Figure 1 As shown, a kind of permanent magnet non-contact magnetic levitation bearing with the same polarity includes a left half ring 1 and a right half ring 2. The left half ring 1 and the right half ring 2 can form a complete shaft ring after being put together. The middle of the left half ring 1 and the right half ring 2 are provided with coaxial annular grooves. Rolling elements 3 are provided in the annular grooves. An annular block is provided in the middle of the rolling elements 3. The annular block is embedded in the annular groove formed by the splicing of the left half ring 1 and the right half ring 2. It also includes an axial magnetic levitation component, a radial magnetic levitation component and a splicing and fixing mechanism. The axial magnetic levitation assembly includes multiple sets of magnets 6, which are fixed to the upper and lower inner walls of the annular groove and the upper and lower end faces of the annular block. The two sets of magnets 6, which are arranged opposite to the inner walls of the annular groove and the end faces of the annular block, have the same magnetism. Through the repulsive force of the same pole, an axial non-contact gap is formed between the rolling element 3 and the shaft ring. The radial magnetic levitation assembly includes a semi-circular magnetic ring 7 and a semi-circular magnetic ring 8. The semi-circular magnetic ring 7 is fixed to the inner sidewall of the annular groove between the left half ring 1 and the right half ring 2. The semi-circular magnetic ring 8 is fixed to the radial outer surface of the annular block of the rolling element 3. The semi-circular magnetic ring 7 and the semi-circular magnetic ring 8 have the same magnetism. Through the repulsive force of the same pole, a radial non-contact gap is formed between the rolling element 3 and the shaft ring. The splicing and fixing mechanism is located between the mating surfaces of the left half-circle 1 and the right half-circle 2, and is used to coaxially and securely splice the left half-circle 1 and the right half-circle 2.

[0020] Specifically, before implementing this bearing, the staff first use the splicing and fixing mechanism to coaxially attach and splice the left half ring 1 and the right half ring 2 to form a complete shaft ring structure. At the same time, the rolling element 3 with the annular block is placed in the annular groove formed by the splicing of the two half rings to complete the pre-assembly of the bearing. After assembly, the bearing is assembled into the shaft system and bearing housing of the transmission system. The shaft ring and bearing housing are interference-fitted, and the rolling element 3 is fitted with the rotating shaft, thus completing the overall installation of the bearing.

[0021] During bearing operation, the same polarity magnets 6, which are arranged opposite to the upper and lower inner walls of the annular groove and the upper and lower end faces of the annular block in the axial magnetic levitation assembly, generate a continuous axial repulsive force, so that a stable axial non-contact gap is formed between the rolling element 3 and the annular groove inner wall of the shaft ring, completely eliminating axial mechanical contact and friction. Meanwhile, in the radial magnetic levitation assembly, the semi-circular magnetic ring 7 on the inner wall of the annular groove and the semi-circular magnetic ring 8 on the outer surface of the annular block of the rolling element 3 generate a continuous radial support force through the repulsive force of the same pole, so that a stable radial non-contact gap is formed between the rolling element 3 and the radial inner wall of the annular groove of the shaft ring, eliminating radial mechanical contact and friction. By using the repulsive force of the same pole permanent magnet in both axial and radial dimensions, the rolling element 3 and the shaft ring are suspended in all dimensions without contact. Without the need for an additional electromagnetic control system, a stable suspension gap can be maintained during rotation, which can reduce frictional torque and operating energy consumption.

[0022] When the bearing needs maintenance, replacement of rolling elements, or inspection of internal magnets, only the assembly and fixing mechanism needs to be disassembled to quickly separate the left half ring 1 and the right half ring 2, and the internal components can be inspected and replaced without disassembling the entire drive shaft system, which greatly reduces the difficulty and cost of maintenance.

[0023] Example 2, based on Example 1, provides a further detailed explanation of the axial magnetic levitation assembly, radial magnetic levitation assembly, assembly and fixing mechanism, and matching sealing structure. See reference [link to example]. Figure 2 and Figure 3 The semicircular magnetic ring 7 is a split structure. The two semicircular magnetic rings 7 are fixed to the inner sidewalls of the annular grooves of the left half ring 1 and the right half ring 2 respectively. After the left half ring 1 and the right half ring 2 are attached, the two semicircular magnetic rings 7 are joined together to form a complete radial permanent magnet inner ring. Furthermore, the semi-circular magnetic ring 28 is arranged in a closed loop around the annular block of the rolling element 3 to form a radial permanent magnet outer ring; Furthermore, the radial permanent magnet inner ring and the radial permanent magnet outer ring are coaxially arranged, and their radially opposite end faces have the same magnetism.

[0024] Specifically, the semi-splittered semi-circular magnetic ring 7 is adapted to the splicing structure of the left half ring 1 and the right half ring 2. The magnet can be pre-installed before the two half rings are spliced. During assembly, there is no need to adjust the coaxiality of the magnets. After the two half rings are attached, a complete closed-loop radial permanent magnet inner ring is automatically formed. This forms a precise radial repulsion structure with the closed-loop radial permanent magnet outer ring on the rolling element 3. This ensures that the radial suspension force is evenly distributed along the circumference, avoids radial wobble during the rotation of the rolling element 3, and improves the rotational accuracy and stability of the bearing.

[0025] As mentioned above, the assembly and fixing mechanism of this solution can achieve high-precision coaxial fastening of the left half-circle 1 and the right half-circle 2, while completely solving the industry pain point of creep wear on the outer ring of the bearing. The specific structure and implementation process of its assembly and fixing mechanism are as follows, please refer to [link / reference]. Figure 4 and Figure 5 : The assembly and fixing mechanism includes four mounting blocks 11, four rectangular slots 5, and four fastening bolts 10. The four mounting blocks 11 are respectively located at the four corners of the mating surface of the left half-circle 1, and the four rectangular slots 5 are correspondingly located at the four corners of the mating surface of the right half-circle 2. The mounting blocks 11 and the rectangular slots 5 are fitted and inserted one-to-one. The outer wall of the right half-circle 2 has threaded holes 9 that communicate with the four rectangular slots 5. The four fastening bolts 10 pass through the corresponding threaded holes 9 and are locked in the mounting blocks 11, thereby achieving axial and circumferential limiting and fixing of the left half-circle 1 and the right half-circle 2.

[0026] Specifically, when assembling the left half-circle 1 and the right half-circle 2, the four mounting blocks 11 on the mating surface of the left half-circle 1 are first inserted into the four rectangular slots 5 on the mating surface of the right half-circle 2. Through the insertion and engagement of the mounting blocks 11 and the rectangular slots 5, the left half-circle 1 and the right half-circle 2 are pre-positioned, while limiting the circumferential relative rotation and axial misalignment between the two half-circles, ensuring the coaxiality of the shaft rings after assembly. After the pre-positioning is completed, the four fastening bolts 10 are screwed into the corresponding threaded holes 9 on the outer wall of the right half-circle 2, so that the ends of the fastening bolts 10 are locked in the mounting block 11, thus completing the fastening and splicing of the two half-circles.

[0027] As described above, this structure requires no additional welding or riveting processes, making it easy to assemble and disassemble. At the same time, it can effectively suppress the micro-displacement between the two halves of the bearing during operation, precisely suppress the circumferential creep and axial movement of the shaft ring, avoid fretting wear, and achieve stable assembly without increasing the interference fit. This reduces the assembly difficulty and internal stress of the shaft ring, and significantly improves the operating stability and service life of the bearing.

[0028] Furthermore, both ends of the shaft ring formed by the splicing of the left half ring 1 and the right half ring 2 are provided with an integrated sealing and lubrication ring. The inner side of the sealing and lubrication ring is provided with a non-contact labyrinth magnetic sealing section, and the outer side is provided with a contact lip sealing section. The sealing and lubrication ring has a magnetic levitation lubrication cavity inside. The inner wall of the magnetic levitation lubrication cavity is provided with a magnetic channel that is connected to the magnetic field of the magnet 6, the semi-circular magnetic ring 1 7, and the semi-circular magnetic ring 2 8. The width of the magnetic channel is 0.5mm to 10mm. The sealing and lubrication ring and the left half ring 1 and the right half ring 2 are all integrated by interference fit.

[0029] Specifically, during bearing operation, the double-sealing structure of the sealing lubrication ring forms a graded protection: The inner non-contact labyrinth magnetic sealing section uses magnetic field force to prevent dust, water vapor and other impurities from entering the magnetic levitation working cavity inside the bearing. At the same time, there is no mechanical contact, so no additional friction loss will be generated. The outer contact-type lip seal section forms a secondary protection, which can further block the intrusion of external pollutants under harsh working conditions and ensure the cleanliness of the working environment of the magnet inside the bearing.

[0030] The magnetic levitation lubrication chamber inside the sealed lubrication ring is connected to the permanent magnet field inside the bearing through a magnetic channel. The magnetic force is used to achieve long-term suspension and uniform distribution of the lubricating medium, eliminating the need for additional lubricating grease and enabling the bearing to be long-term lubrication-free and maintenance-free. At the same time, the integrated interference fit assembly method eliminates the need for additional fasteners, reducing the number of bearing parts and thus reducing assembly difficulty and overall machine cost.

[0031] Furthermore, the rolling element 3 is a spherical rolling element or a cylindrical rolling element. The annular block is integrally formed with the rolling element 3, and the outer diameter of the annular block is smaller than the inner diameter of the annular groove formed after the left half circle 1 and the right half circle 2 are joined together, ensuring that the rolling element 3 can rotate freely in the suspended state without mechanical interference. The left half ring 1, right half ring 2, rolling element 3, and annular block are all made of non-magnetic stainless steel, which can avoid magnetic field short circuits and ensure that the magnetic force of the permanent magnet is fully applied to the suspension support; magnet 6, semi-circular magnetic ring one 7, and semi-circular magnetic ring two 8 are all made of neodymium iron boron permanent magnets, which can provide stable and long-lasting strong magnetic field repulsion force and ensure the long-term stability of the bearing suspension gap.

[0032] Furthermore, the axial non-contact gap between the magnet 6, which is positioned opposite to the end face of the annular block on the inner wall of the annular groove, and the radial non-contact gap between the semi-circular magnetic ring 7 and the semi-circular magnetic ring 8 are both 0.1mm to 2mm. This gap range can be adapted and adjusted according to the bearing's operating load and speed requirements, ensuring non-contact and frictionless operation while avoiding problems such as reduced bearing rotation accuracy and insufficient load-bearing capacity caused by excessive gap.

[0033] It should be noted that the permanent magnet magnetization method, interference fit assembly process, and conventional design of non-contact labyrinth magnetic seal used in this invention are all conventional technical means known to those skilled in the art, and will not be described in detail in this invention.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A type of non-contact magnetic levitation bearing with the same polarity permanent magnet, comprising a left half-ring (1) and a right half-ring (2), wherein the left half-ring (1) and the right half-ring (2) can form a complete shaft ring when fitted together, wherein a coaxial annular groove is provided in the middle of both the left half-ring (1) and the right half-ring (2), wherein a rolling element (3) is provided in the annular groove, and an annular block is provided in the middle of the rolling element (3), wherein the annular block is embedded in the annular groove formed by the splicing of the left half-ring (1) and the right half-ring (2), characterized in that, It also includes an axial magnetic levitation assembly, a radial magnetic levitation assembly, and a splicing and fixing mechanism; The axial magnetic levitation assembly includes multiple sets of magnets (6). The magnets (6) are respectively fixed to the upper and lower inner walls of the annular groove and the upper and lower end faces of the annular block. The two sets of magnets (6) arranged opposite to the inner wall of the annular groove and the end face of the annular block have the same magnetism. The rolling element (3) and the shaft ring form an axial non-contact gap through the repulsive force of the same pole. The radial magnetic levitation assembly includes a semi-circular magnetic ring one (7) and a semi-circular magnetic ring two (8). The semi-circular magnetic ring one (7) is fixed to the inner sidewall of the annular groove of the left half ring (1) and the right half ring (2). The semi-circular magnetic ring two (8) is fixed to the radial outer surface of the annular block of the rolling body (3). The semi-circular magnetic ring one (7) and the semi-circular magnetic ring two (8) have the same magnetism. The repulsive force of the same pole makes the rolling body (3) and the shaft ring form a radial non-contact gap. The splicing and fixing mechanism is located between the mating surfaces of the left half circle (1) and the right half circle (2) and is used to coaxially and securely splice the left half circle (1) and the right half circle (2).

2. The same polarity permanent magnet non-contact magnetic levitation bearing according to claim 1, characterized in that: The semicircular magnetic ring 1 (7) is a split structure. The two semicircular magnetic rings 1 (7) are fixed to the inner sidewalls of the annular grooves of the left half ring (1) and the right half ring (2) respectively. After the left half ring (1) and the right half ring (2) are attached, the two semicircular magnetic rings 1 (7) are spliced ​​together to form a complete radial permanent magnet inner ring. The semicircular magnetic ring 2 (8) is arranged in a closed loop along the circumference of the rolling body (3) annular block to form a radial permanent magnet outer ring; The radial permanent magnet inner ring and the radial permanent magnet outer ring are coaxially arranged, and their radially opposite end faces have the same magnetism.

3. The same polarity permanent magnet non-contact magnetic levitation bearing according to claim 1, characterized in that: The splicing and fixing mechanism includes four mounting blocks (11), four rectangular slots (5) and four fastening bolts (10). The four mounting blocks (11) are respectively set at the four corners of the left half circle (1) mating surface, and the four rectangular slots (5) are correspondingly opened at the four corners of the right half circle (2) mating surface. The mounting blocks (11) and the rectangular slots (5) are matched and plugged in one-to-one. The outer wall of the right half ring (2) is provided with threaded holes (9) that communicate with four rectangular slots (5). The four fastening bolts (10) pass through the corresponding threaded holes (9) and are locked in the mounting block (11) to achieve axial and circumferential positioning and fixing of the left half ring (1) and the right half ring (2).

4. The same polarity permanent magnet non-contact magnetic levitation bearing according to claim 1, characterized in that: Both ends of the shaft ring formed by the left half ring (1) and the right half ring (2) are provided with an integral sealing and lubrication ring. The inner side of the sealing and lubrication ring is provided with a non-contact labyrinth magnetic sealing section, and the outer side is provided with a contact lip sealing section. The inside of the sealing and lubrication ring is provided with a magnetic levitation lubrication cavity. The inner wall of the magnetic levitation lubrication cavity is provided with a magnetic channel that is connected to the magnetic field of the magnet (6), the first semicircular magnetic ring (7), and the second semicircular magnetic ring (8).

5. A contactless magnetic levitation bearing with the same polarity permanent magnet according to claim 4, characterized in that: The width of the magnetic channel is 0.5mm to 10mm, and the sealing lubrication ring is integrated with the left half ring (1) and the right half ring (2) by interference fit.

6. The same polarity permanent magnet non-contact magnetic levitation bearing according to claim 1, characterized in that: The rolling element (3) is a spherical rolling element or a cylindrical rolling element. The annular block is integrally formed with the rolling element (3), and the outer diameter of the annular block is smaller than the inner diameter of the annular groove formed after the left half circle (1) and the right half circle (2) are joined together.

7. A contactless magnetic levitation bearing with the same polarity permanent magnet according to claim 1, characterized in that: The left half ring (1), right half ring (2), rolling body (3) and annular block are all made of non-magnetic stainless steel, and the magnet (6), semi-circular magnetic ring one (7) and semi-circular magnetic ring two (8) are all neodymium iron boron permanent magnets.

8. A contactless magnetic levitation bearing with the same polarity permanent magnet according to claim 1, characterized in that: The axial non-contact gap between the magnet (6) which is arranged opposite to the end face of the annular block on the inner wall of the annular groove, and the radial non-contact gap between the first semicircular magnetic ring (7) and the second semicircular magnetic ring (8) are both 0.1mm to 2mm.

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