A multi-layer magnetic ring pressing strip array type permanent magnetic thrust bearing structure

Abstract

The application provides a multi-layer magnetic ring pressing strip array type permanent magnetic thrust bearing structure, a rotor assembly is connected with a rotating part, a stator assembly is coaxially arranged with the rotor assembly and connected with a fixed part; a plurality of magnetic blocks are arranged on the rotor assembly and the stator assembly; a pressing strip is used to press the magnetic blocks on the rotor assembly and the stator assembly; the rotor assembly comprises a rotor bottom plate, a rotor magnetic block fixing ring and a rotor shielding inner ring assembly; the stator assembly comprises a stator bottom plate, a stator magnetic block fixing ring and a stator shielding outer ring; the rotor magnetic block fixing ring and the stator magnetic block fixing ring are both machined with magnetic block mounting grooves and pressing strip mounting grooves, the pressing strip is connected with the rotor magnetic block fixing ring and the stator magnetic block fixing ring through bolts and is used to press the magnetic blocks in the magnetic block mounting grooves. According to the technical scheme, the leakage of the magnetic field and the looseness of the magnetic blocks are reduced while the axial thrust performance of the permanent magnetic thrust bearing is ensured, the heat dissipation capacity and the operation efficiency of the thrust bearing are improved, and the long-term stable operation of the whole ship transmission system is ensured.

Description

Technical Field

[0001] This invention belongs to the field of bearing design technology, and specifically relates to a multi-layer magnetic ring pressure bar array permanent magnet thrust bearing structure. Background Technology

[0002] Thrust bearings are an important component of ship transmission systems. Permanent magnet thrust bearings, as a novel non-contact support solution for thrust bearings, bear the bearing load through the interaction of magnetic fields between magnetic blocks, avoiding mechanical contact. This significantly reduces efficiency losses during ship transmission, while also reducing vibration and noise in the ship transmission system and improving the overall system reliability. It is of vital importance for improving the propulsion efficiency and stealth performance of ships, especially high-performance, low-noise vessels.

[0003] Existing permanent magnet thrust bearings, especially those involving multi-layer magnetic ring structures, still face the following technical bottlenecks in design and application: First, existing structures often use fan-shaped magnetic blocks spliced ​​together. This splicing method easily leads to magnetic field leakage at the joints between adjacent magnetic blocks, resulting in uneven magnetic flux density distribution and reduced overall structural strength, further diminishing the axial load-bearing capacity of the thrust bearing. This insufficient load-bearing capacity is particularly prominent under high-speed, heavy-load scenarios. Second, during high-speed rotation, the magnetic blocks are prone to stress concentration under the combined effects of vibration and centrifugal force, which can lead to stress buildup under long-term alternating loads. Under operating conditions, the adhesive or connection structure between the magnetic blocks is prone to failure, which can easily lead to loosening, displacement, or even detachment of the magnetic blocks, seriously affecting the operational reliability and structural safety of the bearing. Finally, the existing permanent magnet thrust bearing structure generally lacks an effective heat dissipation path, while high-performance permanent magnet materials are extremely sensitive to temperature. During operation, the eddy currents generated by the alternating magnetic field will generate heat accumulation in the magnetic blocks. High temperature will cause irreversible magnetic performance decay of the permanent magnet, directly reducing the thrust bearing capacity of the bearing, shortening its service life, and affecting the operational reliability of the permanent magnet thrust bearing and the entire ship transmission system.

[0004] Therefore, how to provide a multi-layer magnetic ring pressure bar array permanent magnet thrust bearing structure that can ensure the axial thrust performance of the permanent magnet thrust bearing while reducing magnetic field leakage and magnetic block loosening, improving the heat dissipation capacity and operating efficiency of the thrust bearing, and ensuring the long-term stable operation of the entire ship transmission system has become an urgent technical problem to be solved. Summary of the Invention

[0005] This invention provides a multi-layer magnetic ring bar array permanent magnet thrust bearing structure that, while ensuring the axial thrust performance of the permanent magnet thrust bearing, reduces magnetic field leakage and magnetic block loosening, improves the heat dissipation capacity and operating efficiency of the thrust bearing, and ensures the long-term stable operation of the entire ship's transmission system.

[0006] In one embodiment of the present invention, a multi-layer magnetic ring pressure bar array type permanent magnet thrust bearing structure is provided, comprising: Rotor assembly 1, which is used to connect to the rotating component; Stator assembly 2, which is coaxially arranged with rotor assembly 1 and is used to connect to a stationary component; Multiple magnetic blocks 3 are disposed on the rotor assembly 1 and the stator assembly 2; Pressure bar 4, which presses the magnetic block 3 onto the rotor assembly 1 and the stator assembly 2; The rotor assembly 1 includes a rotor base plate 1.1, a rotor magnetic block fixing ring 1.2 disposed on the rotor base plate 1.1, and a rotor shield inner ring assembly 1.3 disposed inside the rotor base plate 1.1; The stator assembly 2 includes a stator base plate 2.1, a stator magnetic block fixing ring 2.3 disposed on the stator base plate 2.1, and a stator shielding outer ring 2.2 disposed on the outside of the stator base plate 2.1; Both the rotor magnetic block fixing ring 1.2 and the stator magnetic block fixing ring 2.3 are machined with magnetic block mounting grooves for mounting magnetic blocks 3 and pressure strip mounting grooves for mounting pressure strips 4. The pressure strips 4 are connected to the rotor magnetic block fixing ring 1.2 and the stator magnetic block fixing ring 2.3 respectively by bolts, and press the magnetic blocks 3 into the magnetic block mounting grooves. Magnetic block 3 has a radial ring structure.

[0007] Furthermore, the rotor base plate 1.1 has multiple mounting ring surfaces for mounting rotor magnetic block fixing rings 1.2, and the stator base plate 2.1 has multiple mounting ring surfaces for mounting stator magnetic block fixing rings 2.3. The number of mounting ring surfaces corresponds to the number of magnetic ring layers. The more rings there are, the stronger the magnetic force and the greater the radial and axial load-bearing capacity.

[0008] Furthermore, the rotor shield inner ring assembly 1.3 includes a rotor shield inner ring 1.3.3, a radial bearing 1.3.2 disposed inside the rotor shield inner ring 1.3.3, and a cover plate 1.3.1 connected to the rotor shield inner ring 1.3.3 by bolts. The cover plate 1.3.1 is used to axially limit the radial bearing 1.3.2.

[0009] Furthermore, the stator shielding outer ring 2.2 is used to shield the internal magnetic field to prevent magnetic field leakage, and the outer circular surface of the stator shielding outer ring 2.2 is provided with heat dissipation fins. The heat dissipation fins are integrally formed with the stator shielding outer ring 2.2 and are used to conduct the heat generated by the magnetic block 3 during operation to the heat dissipation fins through the stator shielding outer ring 2.2 for heat dissipation.

[0010] Furthermore, the magnetic block 3 has a T-shaped structure, and the back of the magnetic block 3 is provided with a groove for cooperating with the pressure strip 4.

[0011] Furthermore, the pressure strip 4 has a double-layer structure, including an inner elastic layer and an outer high-strength layer. The inner elastic layer is used to buffer high-frequency vibration, and the outer high-strength layer is used to provide mechanical restraint. The material of the inner elastic layer is TC4 titanium alloy, and the material of the outer high-strength layer is 316L stainless steel.

[0012] Furthermore, the surface of the pressure strip 4 is machined with countersunk screw holes, and the pressure strip 4 is fixed to the rotor magnetic block fixing ring 1.2 and the stator magnetic block fixing ring 2.3 respectively by screws; the rotor magnetic block fixing ring 1.2 is connected to the rotor base plate 1.1 by bolts, and the stator magnetic block fixing ring 2.3 is connected to the stator base plate 2.1 by bolts.

[0013] Furthermore, the material of magnetic block 3 is N52H type neodymium iron boron permanent magnet, and the materials of rotor base plate 1.1 and stator base plate 2.1 are aluminum alloy.

[0014] Furthermore, the rotor assembly 1 is connected to the drive shaft by bolts, and the stator assembly 2 is connected to the test bench mounting plate by bolts.

[0015] Furthermore, the radiation ring structure of the magnetic block 3 is a large-size magnetic cylinder-type radiation ring structure, and it is an integral ring structure.

[0016] The beneficial effects of this invention are as follows: As can be seen from the above scheme, the embodiments of the present invention provide a multi-layer magnetic ring and bar array permanent magnet thrust bearing structure, wherein the rotor assembly 1 is connected to the rotating component; the stator assembly 2 is coaxially arranged with the rotor assembly 1 and is used to connect with the fixed component; multiple magnetic blocks 3 are disposed on the rotor assembly 1 and the stator assembly 2; the bar 4 presses the magnetic blocks 3 onto the rotor assembly 1 and the stator assembly 2; the rotor assembly 1 includes a rotor base plate 1.1, a rotor magnetic block fixing ring 1.2 disposed on the rotor base plate 1.1, and a rotating magnetic block fixing ring 1.2 disposed on the inner side of the rotor base plate 1.1. The rotor shield inner ring assembly 1.3; the stator assembly 2 includes a stator base plate 2.1, a stator magnetic block fixing ring 2.3 disposed on the stator base plate 2.1, and a stator shield outer ring 2.2 disposed outside the stator base plate 2.1; both the rotor magnetic block fixing ring 1.2 and the stator magnetic block fixing ring 2.3 are machined with magnetic block mounting grooves for mounting magnetic blocks 3 and pressure strip mounting grooves for mounting pressure strips 4. The pressure strips 4 are connected to the rotor magnetic block fixing ring 1.2 and the stator magnetic block fixing ring 2.3 respectively by bolts, pressing the magnetic blocks 3 tightly into the magnetic block mounting grooves. This invention, while ensuring the axial thrust performance of the permanent magnet thrust bearing, reduces magnetic field leakage and magnetic block loosening, improves the heat dissipation capacity and operating efficiency of the thrust bearing, and ensures the long-term stable operation of the entire ship's transmission system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a multi-layer magnetic ring pressure bar array type permanent magnet thrust bearing structure according to the present invention; Figure 2 This is a schematic diagram of a rotor assembly of a multi-layer magnetic ring pressure bar array type permanent magnet thrust bearing structure according to the present invention; Figure 3 This is a schematic diagram of the rotor shielding inner ring assembly of a multi-layer magnetic ring pressure bar array type permanent magnet thrust bearing structure according to the present invention; Figure 4 This is a schematic diagram of a nail assembly of a multi-layer magnetic ring pressure bar array type permanent magnet thrust bearing structure according to the present invention; In the figure, 1 is the rotor assembly; 1.1 is the rotor base plate; 1.2 is the rotor magnet fixing ring; 1.3 is the rotor shield inner ring assembly; 1.3.1 is the cover plate; 1.3.2 is the radial bearing; 1.3.3 is the rotor shield inner ring; 2 is the stator assembly; 2.1 is the stator base plate; 2.2 is the stator shield outer ring; 2.3 is the stator magnet fixing ring; 3 is the magnet; 4 is the pressure bar. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0019] This invention provides a multi-layer magnetic ring and bar array permanent magnet thrust bearing structure, which, while ensuring the axial thrust performance of the permanent magnet thrust bearing, reduces magnetic field leakage and magnetic block loosening, improves the heat dissipation capacity and operating efficiency of the thrust bearing, and further ensures the long-term stable operation of the entire ship transmission system.

[0020] like Figures 1 to 4 As shown, Figure 1 This is a schematic diagram of a multi-layer magnetic ring pressure bar array type permanent magnet thrust bearing structure according to the present invention; Figure 2 This is a schematic diagram of a rotor assembly of a multi-layer magnetic ring pressure bar array type permanent magnet thrust bearing structure according to the present invention; Figure 3 This is a schematic diagram of the rotor shielding inner ring assembly of a multi-layer magnetic ring pressure bar array type permanent magnet thrust bearing structure according to the present invention; Figure 4 This is a schematic diagram of a nail assembly of a multi-layer magnetic ring pressure bar array type permanent magnet thrust bearing structure according to the present invention.

[0021] Figure 1 A multi-layer magnetic ring pressure bar array type permanent magnet thrust bearing structure includes: Rotor assembly 1, which is used to connect to the rotating component; Stator assembly 2, which is coaxially arranged with rotor assembly 1 and is used to connect to a stationary component; Multiple magnetic blocks 3 are disposed on the rotor assembly 1 and the stator assembly 2; Pressure bar 4, which presses the magnetic block 3 onto the rotor assembly 1 and the stator assembly 2; The rotor assembly 1 includes a rotor base plate 1.1, a rotor magnetic block fixing ring 1.2 disposed on the rotor base plate 1.1, and a rotor shield inner ring assembly 1.3 disposed inside the rotor base plate 1.1; The stator assembly 2 includes a stator base plate 2.1, a stator magnetic block fixing ring 2.3 disposed on the stator base plate 2.1, and a stator shielding outer ring 2.2 disposed on the outside of the stator base plate 2.1; Both the rotor magnetic block fixing ring 1.2 and the stator magnetic block fixing ring 2.3 are machined with magnetic block mounting grooves for mounting magnetic blocks 3 and pressure strip mounting grooves for mounting pressure strips 4. The pressure strips 4 are connected to the rotor magnetic block fixing ring 1.2 and the stator magnetic block fixing ring 2.3 respectively by bolts, and press the magnetic blocks 3 into the magnetic block mounting grooves. Magnetic block 3 has a radial ring structure.

[0022] In this embodiment of the invention, a multi-layer magnetic ring and pressure bar array type permanent magnet thrust bearing structure is provided. The rotor assembly and stator assembly are coaxially arranged. The magnetic block fixing ring is simultaneously machined with magnetic block mounting grooves and pressure bar mounting grooves. The pressure bars press the magnetic blocks into the mounting grooves by bolts. The magnetic blocks have a radial ring structure. Compared with the existing technology that uses fan-shaped magnetic block splicing structure, the radial ring structure of the present invention eliminates splicing seams, fundamentally avoiding magnetic field leakage. Compared with the existing technology that uses bonding or a single pressure ring for fixing, the "mounting groove + pressure bar" dual fixing mechanism of the present invention significantly improves the reliability of magnetic block fixing.

[0023] In this embodiment of the invention, a multi-layer magnetic ring and bar array permanent magnet thrust bearing structure replaces the traditional fan-shaped splicing with a large-size magnetic cylinder radial ring structure, optimizing the magnetic circuit distribution and increasing the air gap magnetic flux density by 12%-18%. This results in a corresponding increase in the bearing's axial load capacity of 15%-20%, meeting the thrust requirements of marine transmission systems under heavy load conditions. Through a high-strength, lightweight aluminum alloy frame and a double-layer elastic bar design, the overall structural rigidity is ensured while effectively buffering high-frequency vibrations. This bar structure serves as a safety redundancy, providing mechanical restraint in case of accidental loosening of the magnetic blocks, strictly controlling the radial runout to within 0.05mm, greatly improving operational reliability. An integrated heat dissipation channel enhances the thermal conductivity and heat dissipation capacity of the magnetic rings, stabilizing the operating temperature below 60℃. This avoids the magnetic performance degradation of permanent magnet materials such as neodymium iron boron due to high temperatures (>80℃), extending the bearing's service life to over 12 years, a 20%-50% improvement over existing structures. The segmented magnetic block and modular pressure bar design significantly reduces the difficulty of on-site assembly and subsequent maintenance. Maintenance does not require disassembling the entire bearing assembly; only the damaged individual magnetic block or pressure bar module needs to be replaced, effectively shortening the maintenance cycle and reducing maintenance costs. In another embodiment of the present invention, the surface of the rotor base plate 1.1 is machined with a plurality of mounting ring surfaces for mounting rotor magnetic block fixing rings 1.2, and the surface of the stator base plate 2.1 is machined with a plurality of mounting ring surfaces for mounting stator magnetic block fixing rings 2.3. The number of mounting ring surfaces corresponds to the number of magnetic ring layers. The more rings there are, the stronger the magnetic force and the greater the radial and axial load-bearing capacity.

[0024] In this embodiment of the invention, the number of mounting ring surfaces on the rotor base plate and stator base plate is limited to correspond to the number of magnetic ring layers. The mounting ring surface structure allows the number of magnetic ring layers to be flexibly adjusted according to actual working conditions, realizing a customizable design for load-bearing capacity.

[0025] In another embodiment of the present invention, the rotor shielding inner ring assembly 1.3 includes a rotor shielding inner ring 1.3.3, a radial bearing 1.3.2 disposed inside the rotor shielding inner ring 1.3.3, and a cover plate 1.3.1 connected to the rotor shielding inner ring 1.3.3 by bolts. The cover plate 1.3.1 is used to axially limit the radial bearing 1.3.2.

[0026] In another embodiment of the present invention, the stator shielding outer ring 2.2 is used to shield the internal magnetic field to prevent magnetic field leakage, and the outer circular surface of the stator shielding outer ring 2.2 is provided with heat dissipation fins. The heat dissipation fins are integrally formed with the stator shielding outer ring 2.2 and are used to conduct the heat generated by the magnetic block 3 during operation to the heat dissipation fins through the stator shielding outer ring 2.2 for heat dissipation.

[0027] In this embodiment of the invention, the stator shielding outer ring is designed to simultaneously provide magnetic field shielding and heat dissipation via heat sink fins. Compared to existing technologies that lack effective heat dissipation pathways and are prone to demagnetization failure of the permanent magnet ring due to high temperatures, the stator shielding outer ring integrates both magnetic field shielding and heat dissipation functions, forming a complete heat dissipation path and effectively controlling the operating temperature.

[0028] In another embodiment of the present invention, the magnetic block 3 has a T-shaped structure, and the back of the magnetic block 3 is provided with a groove for cooperating with the pressure strip 4.

[0029] In another embodiment of the present invention, the pressure strip 4 has a double-layer structure, including an inner elastic layer and an outer high-strength layer. The inner elastic layer is used to buffer high-frequency vibrations, and the outer high-strength layer is used to provide mechanical restraint. The material of the inner elastic layer is TC4 titanium alloy, and the material of the outer high-strength layer is 316L stainless steel. The double-layer pressure strip of the present invention has both elastic buffering and high-strength restraint functions, forming a safety redundancy mechanism.

[0030] In another embodiment of the present invention, the surface of the pressure strip 4 is machined with countersunk screw holes, and the pressure strip 4 is fixed to the rotor magnetic block fixing ring 1.2 and the stator magnetic block fixing ring 2.3 by screws respectively; the rotor magnetic block fixing ring 1.2 is connected to the rotor base plate 1.1 by bolts, and the stator magnetic block fixing ring 2.3 is connected to the stator base plate 2.1 by bolts.

[0031] In another embodiment of the present invention, the material of the magnetic block 3 is N52H type neodymium iron boron permanent magnet, and the materials of the rotor base plate 1.1 and the stator base plate 2.1 are aluminum alloy.

[0032] In another embodiment of the present invention, the rotor assembly 1 is connected to the drive shaft by bolts, and the stator assembly 2 is connected to the test bench fixing plate by bolts.

[0033] In another embodiment of the present invention, the radiation ring structure of the magnetic block 3 is a large-size magnetic cylinder type radiation ring structure, and is an integral ring structure.

[0034] In another embodiment of the present invention, such as Figure 1As shown, a multi-layer magnetic ring and pressure bar array type permanent magnet thrust bearing structure includes: 1. Rotor assembly: 1.1 Rotor base plate; 1.2 Rotor magnetic block fixing ring; 1.3 Rotor shielding inner ring assembly; 1.3.1 Cover plate; 1.3.2 Radial bearing bush; 1.3.3 Rotor shielding inner ring; 2. Stator assembly: 2.1 Stator base plate; 2.2 Stator shielding outer ring; 2.3 Stator magnetic block fixing ring; 3 Magnetic blocks; 4. Pressure bars, etc. The rotor assembly 1 is connected to the rotating parts by bolts; the stator assembly 2 is connected to the test bench fixing plate by bolts; the magnetic blocks 3 are placed in the magnetic block placement holes on the rotor assembly 1 and the stator assembly 2; the pressure bars 4 are bolted to press the magnetic blocks 3 into the magnetic block placement holes on the rotor assembly 1 and the stator assembly 2. During operation, the shaft system drives the rotor assembly 1 to rotate. The stator assembly 2 and the rotor assembly 1 are supported in a non-contact manner. Radial bearing is achieved through the action of magnetic force. The axial displacement of the rotor assembly 1 under the action of magnetic force transmits the thrust to the stator assembly 2, thereby realizing the forward and reverse rotation of the hull.

[0035] Figure 2 In the rotor assembly 1, there are a rotor base plate 1.1, a rotor magnet fixing ring 1.2, and a rotor shielding inner ring assembly 1.3. The rotor base plate 1.1 has a mounting ring surface for the rotor magnet fixing ring 1.2. The more rings there are, the stronger the magnetic force and the greater the radial and axial load-bearing capacity. The rotor magnet fixing ring 1.2 is connected to the rotor base plate 1.1 by bolts. The outer surface of the rotor magnet fixing ring 1.2 has mounting grooves for magnets 3 and pressure strips 4, and bolt mounting holes are provided. The pressure strips 4 are connected to the rotor magnet fixing ring 1.2 by bolts.

[0036] like Figure 3 As shown, the rotor shielding inner ring assembly 1.3 includes a cover plate (1.3.1), a radial bearing (1.3.2), and a rotor shielding inner ring (1.3.3). The rotor shielding inner ring 1.3.3 shields the internal magnetic field. The cover plate (1.3.1) is connected to the rotor shielding inner ring 1.3.3 by bolts to achieve axial limiting of the radial bearing (1.3.2).

[0037] like Figure 4 As shown, the stator assembly 2 includes a stator base plate 2.1, a stator shielding outer ring 2.2, and a stator magnetic block fixing ring 2.3. The surface of the stator base plate 2.1 is machined with the mounting ring surface of the stator magnetic block fixing ring 2.3. The more rings, the stronger the magnetic force and the greater the radial and axial load-bearing capacity. The stator shielding outer ring 2.2 shields the internal magnetic field and prevents magnetic field leakage. At the same time, fins are provided on the outer surface for heat dissipation. The stator magnetic block fixing ring 2.3 is connected to the rotor base plate 2.1 by bolts. The outer surface of the stator magnetic block fixing ring 2.3 is machined with mounting grooves for magnetic blocks 3 and pressure strips 4, and is provided with bolt mounting holes. The pressure strips 4 are connected to the stator magnetic block fixing ring 1.2 by bolts.

[0038] The magnetic block 3 has a T-shaped structure and is made of N52H type Nd-Fe-B permanent magnet. A pressure strip 4 is provided on its back. The magnetic block 3 is placed in the magnetic block mounting grooves on the surfaces of the rotor magnetic block fixing ring 1.2 and the stator magnetic block fixing ring 2.3, and is pressed firmly by the pressure strip 4.

[0039] The pressure strip 4 has a double-layer structure. The inner elastic layer is made of TC4 titanium alloy, and the outer high-strength layer is made of 316L stainless steel. The surface is machined with screw countersunk holes, and it is fixed to the magnetic block fixing ring 1.2 and the stator magnetic block fixing ring 2.3 by screws.

[0040] This invention provides a multi-layer magnetic ring and bar array permanent magnet thrust bearing structure. A rotor assembly 1 is connected to a rotating component; a stator assembly 2 is coaxially arranged with the rotor assembly 1 and is used to connect to a fixed component; multiple magnetic blocks 3 are disposed on the rotor assembly 1 and the stator assembly 2; bar 4 presses the magnetic blocks 3 tightly onto the rotor assembly 1 and the stator assembly 2; the rotor assembly 1 includes a rotor base plate 1.1, a rotor magnetic block fixing ring 1.2 disposed on the rotor base plate 1.1, and a rotor shielding inner ring disposed inside the rotor base plate 1.1. Component 1.3; Stator assembly 2 includes a stator base plate 2.1, a stator magnetic block fixing ring 2.3 disposed on the stator base plate 2.1, and a stator shielding outer ring 2.2 disposed outside the stator base plate 2.1; Both the rotor magnetic block fixing ring 1.2 and the stator magnetic block fixing ring 2.3 are machined with magnetic block mounting grooves for mounting magnetic blocks 3 and pressure strip mounting grooves for mounting pressure strips 4. The pressure strips 4 are connected to the rotor magnetic block fixing ring 1.2 and the stator magnetic block fixing ring 2.3 respectively by bolts, pressing the magnetic blocks 3 tightly into the magnetic block mounting grooves. The technical solution of the present invention, while ensuring the axial thrust performance of the permanent magnet thrust bearing, reduces magnetic field leakage and magnetic block loosening, improves the heat dissipation capacity and operating efficiency of the thrust bearing, and ensures the long-term stable operation of the entire ship transmission system.

[0041] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A multi-layer magnetic ring pressure bar array type permanent magnet thrust bearing structure, characterized in that, The bearing structure includes: Rotor assembly (1), which is used to connect with rotating parts; Stator assembly (2), which is coaxially arranged with the rotor assembly (1) and is used to connect to a stationary component; Multiple magnetic blocks (3) are disposed on the rotor assembly (1) and the stator assembly (2); Pressure bar (4) presses the magnetic block (3) against the rotor assembly (1) and the stator assembly (2); The rotor assembly (1) includes a rotor base plate (1.1), a rotor magnetic block fixing ring (1.2) disposed on the rotor base plate (1.1), and a rotor shielding inner ring assembly (1.3) disposed inside the rotor base plate (1.1). The stator assembly (2) includes a stator base plate (2.1), a stator magnet fixing ring (2.3) disposed on the stator base plate (2.1), and a stator shielding outer ring (2.2) disposed on the outside of the stator base plate (2.1). Both the rotor magnetic block fixing ring (1.2) and the stator magnetic block fixing ring (2.3) are machined with magnetic block mounting grooves for mounting the magnetic block (3) and pressure strip mounting grooves for mounting the pressure strip (4). The pressure strip (4) is connected to the rotor magnetic block fixing ring (1.2) and the stator magnetic block fixing ring (2.3) respectively by bolts, and presses the magnetic block (3) into the magnetic block mounting groove. The magnetic block (3) has a radiation ring structure.

2. The multi-layer magnetic ring pressure bar array permanent magnet thrust bearing structure according to claim 1, characterized in that, The rotor base plate (1.1) has multiple mounting ring surfaces for mounting the rotor magnetic block fixing ring (1.2) on its surface, and the stator base plate (2.1) has multiple mounting ring surfaces for mounting the stator magnetic block fixing ring (2.3) on its surface. The number of mounting ring surfaces corresponds to the number of magnetic ring layers. The more rings there are, the stronger the magnetic force and the greater the radial and axial load-bearing capacity.

3. The multi-layer magnetic ring pressure bar array permanent magnet thrust bearing structure according to claim 1, characterized in that, The rotor shielding inner ring assembly (1.3) includes a rotor shielding inner ring (1.3.3), a radial bearing (1.3.2) disposed inside the rotor shielding inner ring (1.3.3), and a cover plate (1.3.1) connected to the rotor shielding inner ring (1.3.3) by bolts. The cover plate (1.3.1) is used to axially limit the radial bearing (1.3.2).

4. The multi-layer magnetic ring pressure bar array permanent magnet thrust bearing structure according to claim 1, characterized in that, The stator shielding outer ring (2.2) is used to shield the internal magnetic field to prevent magnetic field leakage. The outer circular surface of the stator shielding outer ring (2.2) is provided with heat dissipation fins. The heat dissipation fins are integrally formed with the stator shielding outer ring (2.2) and are used to conduct the heat generated by the magnetic block (3) during operation to the heat dissipation fins through the stator shielding outer ring (2.2) for heat dissipation.

5. The multi-layer magnetic ring pressure bar array type permanent magnet thrust bearing structure according to claim 1, characterized in that, The magnetic block (3) has a T-shaped structure, and the back of the magnetic block (3) is provided with a groove for cooperating with the pressure strip (4).

6. The multi-layer magnetic ring pressure bar array permanent magnet thrust bearing structure according to claim 1, characterized in that, The pressure strip (4) has a double-layer structure, including an inner elastic layer and an outer high-strength layer. The inner elastic layer is used to buffer high-frequency vibration, and the outer high-strength layer is used to provide mechanical restraint. The material of the inner elastic layer is TC4 titanium alloy, and the material of the outer high-strength layer is 316L stainless steel.

7. The multi-layer magnetic ring pressure bar array type permanent magnet thrust bearing structure according to claim 1, characterized in that, The surface of the pressure strip (4) is machined with countersunk holes for screws. The pressure strip (4) is fixed to the rotor magnetic block fixing ring (1.2) and the stator magnetic block fixing ring (2.3) respectively by screws. The rotor magnetic block fixing ring (1.2) is connected to the rotor base plate (1.1) by bolts, and the stator magnetic block fixing ring (2.3) is connected to the stator base plate (2.1) by bolts.

8. The multi-layer magnetic ring pressure bar array type permanent magnet thrust bearing structure according to claim 1, characterized in that, The material of the magnetic block (3) is N52H type neodymium iron boron permanent magnet, and the materials of the rotor base plate (1.1) and the stator base plate (2.1) are aluminum alloy.

9. The multi-layer magnetic ring pressure bar array type permanent magnet thrust bearing structure according to claim 1, characterized in that, The rotor assembly (1) is connected to the drive shaft by bolts, and the stator assembly (2) is connected to the test bench fixing plate by bolts.

10. The multi-layer magnetic ring pressure bar array permanent magnet thrust bearing structure according to claim 1, characterized in that, The magnetic block (3) has a large-size magnetic cylinder-type radiation ring structure and is an integral ring structure.

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