Axial parallel split type permanent magnet-water lubrication composite bearing

Abstract

The invention provides an axially parallel split permanent magnet-water lubricated composite bearing, which belongs to the technical field of bearing design, is applied to a ship propulsion shafting, and comprises a magnetic force bearing module, a magnetic shaft sleeve, a magnet mounting base and a water lubricated bearing. The magnetic force bearing module and the water lubricated bearing are arranged in parallel in the axial direction of the stern shaft. The water-lubricated bearing is arranged on one side close to the propeller and is wholly soaked in a working medium; the magnetic shaft sleeve of a cylindrical structure is installed on a stern shaft, and a stern bearing is attracted under the action of a permanent magnet array in the magnetic force bearing module. And the magnet mounting base is used for supporting the magnetic force bearing module and regulating and controlling the magnetic force. According to the integral permanent magnet-water lubricated composite bearing, the permanent magnets and the water lubricated bearing in the integral permanent magnet-water lubricated composite bearing are structurally split, the mutual restriction of a magnetic force bearing module and a water lubricated bearing module in the aspects of space, size and performance can be effectively eliminated, and the use flexibility is enhanced; the bearing distribution of the shaft system can be optimized, and it is ensured that the tail shaft system has good dynamic stability.

Description

Technical Field

[0001] The invention belongs to the technical field of bearing design, and relates to an axially parallel split permanent magnet-water lubrication composite bearing. Background Art

[0002] The stern bearing is a key component of the ship's propulsion shaft system, and it assumes the important function of supporting and lubricating the shaft system. The water-lubricated stern bearing uses natural water as the lubricating medium, and has the advantages of being environmentally friendly and simple in structure. However, the viscosity of water is much lower than that of traditional lubricating oil, and the bearing capacity is proportional to the viscosity. Therefore, under the same conditions, the bearing capacity of water-lubricated bearings is significantly lower than that of oil-lubricated bearings. When the shaft system is in low-speed or start-stop conditions, the fluid dynamic pressure effect is weakened, and the above problems become more prominent. At this time, the water film thickness between the journal and the bearing is at the same order of magnitude as the surface roughness of the friction pair, resulting in the bearing being in a mixed lubrication state, which is prone to cause severe friction and wear, and sometimes vibration and noise problems. In addition, as modern ships continue to grow in size, the propeller's own gravity and thrust during operation are increasing, which will lead to a significant increase in bearing loads on the one hand, and on the other hand, the propeller overhang load will cause the stern shaft to bend and deflect, resulting in local solid contact between the journal and the bearing at the edge, thereby causing more serious friction and wear or vibration and noise problems. Effective measures are urgently needed to reduce the load level of the stern bearing and improve its lubrication state. Unfortunately, for modern ships, the reliability requirements of the stern bearing are extremely high, and the working conditions need to be constantly adjusted according to the task, which limits the application of hydrostatic water-lubricated bearings or hydrostatic water-lubricated bearings. Once a problem occurs in the water-lubricated stern bearing, the impact may be catastrophic.

[0003] Thanks to the rapid development of rare earth permanent magnet materials in my country, a design of a permanent magnet-water lubricated composite bearing has been proposed. The core idea is to arrange a certain number of permanent magnets locally in the inner lining of the traditional water-lubricated bearing bushing, so as to use the permanent magnets to apply magnetic force to the magnetic sleeve on the stern shaft, so that the load applied by the stern shaft to the bearing bushing is greatly reduced, thereby greatly improving the lubrication state of the water-lubricated stern bearing, effectively reducing the friction and wear of the water-lubricated stern bearing, and increasing its life. However, in the above-mentioned permanent magnet-water lubricated composite bearing, the permanent magnet and the bearing are integrally composited, which is subject to many restrictions in design and use. First, the integral permanent magnet-water lubricated composite bearing needs to arrange different functional modules in a limited space, which will inevitably interfere with and restrict each other, and the difficulty of installing the permanent magnet will also increase; secondly, the magnetic force bearing ratio in the integral permanent magnet-water lubricated composite bearing is fixed after manufacturing, and lacks adjustability when facing different working conditions. Sometimes, dynamic instability occurs due to the excessive magnetic force ratio; finally, the magnetic sleeve in the integral permanent magnet-water lubricated composite bearing is not only a receptor of magnetic force, but also a friction pair with the journal, so its material must take into account corrosion resistance, good magnetic properties and tribological properties, which brings great challenges to the research and processing of related materials. Therefore, it is urgent to carry out innovative design based on the characteristics of water-lubricated stern bearings. Summary of the invention

[0004] The purpose of the present invention is to provide an axially parallel split permanent magnet-water lubricated composite bearing, which overcomes the structural limitations of the integral permanent magnet-water lubricated composite bearing design, improves the adaptability of the bearing working conditions, reduces the requirements for bearing materials and the difficulty of bearing manufacturing, processing and installation. The present invention can provide a more excellent stern bearing for marine equipment, improve its operating stability and reliability, and extend the service life of key components.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A split type permanent magnet-water lubricated composite bearing arranged in parallel in the axial direction, the split type permanent magnet-water lubricated composite bearing is applied to the ship propulsion shaft system, and comprises a magnetic bearing module, a magnetic sleeve 7, a magnet mounting base 8 and a water lubricated bearing 10. The magnetic bearing module and the water lubricated bearing 10 are arranged in parallel along the axial direction of the stern shaft 1, and a dynamic sealing structure 9 is provided between the hull 12 and the stern shaft 1 between the magnetic bearing module and the water lubricated bearing 10. The magnetic bearing module is arranged on the side of the dynamic sealing structure 9 away from the propeller 11, and is completely isolated from the working medium 13, so as to avoid the magnetic bearing module from being corroded by the medium, worn by impurities and polluted by marine organisms; the water lubricated bearing 10 is arranged on the side outside the dynamic sealing structure 9 close to the propeller 11, and is immersed in the working medium 13 as a whole.

[0007] The magnetic bearing module includes a metal shell 2, a positioning grid 3 located in the metal shell 2, a permanent magnet array 6 located in the positioning grid 3, an encapsulation layer 4 located on the side of the positioning grid 3 and the permanent magnet array 6 close to the surface of the stern shaft 1, and anti-collision tiles 5 located on both sides; the metal shell 2 is made of magnetic material and is a semi-cylindrical shell structure, with ear plate structures processed on both sides, and is fixedly connected to the magnet mounting base 8 through the ear plates; the positioning grid 3 is used for the installation and positioning of the permanent magnet array 6, and is fixedly connected to the inner wall of the metal shell 2; the permanent magnet is adsorbed on the inner wall of the metal shell 2 by magnetic force, and is arranged in the positioning grid 3 to form a permanent magnet array 6; the arrangement mode of the permanent magnet array 6 and the parameters of a single permanent magnet are obtained through calculation and analysis according to actual use requirements to meet the magnetic requirements of the entire system The requirements of force size; the packaging layer 4 covers the side of the positioning grid 3 and the permanent magnet array 6 close to the surface of the stern shaft 1, and adopts non-magnetic polymer materials to provide necessary protection for the permanent magnets; the anti-collision and wear tiles 5 are located on both sides of the magnetic force bearing module, and are made of polymer materials with good elasticity and anti-friction and wear properties. The specific materials can be ultra-high molecular weight polyethylene, cerium, polyetheretherketone, polyimide, nylon, etc.; the outer surface of the anti-collision and wear tile 5 is fixed to the inner wall of the metal shell 2, and there is a certain gap C2 between its inner surface and the outer surface of the magnetic sleeve 7, and C2 is slightly smaller than the gap C1 between the packaging layer 4 and the outer surface of the magnetic sleeve 7, to ensure that when the stern shaft 1 is subjected to abnormal load, the magnetic sleeve 7 first collides or rubs with the anti-collision and wear tile 5, thereby protecting the packaging layer 4 and the permanent magnet array 6.

[0008] The magnetic sleeve 7 is made of a highly permeable magnetic material and is a cylindrical structure as a whole. It is installed on the stern shaft 1 with a slight interference fit. The magnetic field of the permanent magnet array 6 acts on the magnetic sleeve 7, and is then transmitted to the stern shaft 1 by the magnetic sleeve 7 through contact, thereby partially bearing the gravity load on the stern shaft 1 and the propeller 11, and ultimately reducing the load of the stern shaft 1 on the water-lubricated bearing 10; the axial length of the magnetic sleeve 7 is greater than the axial length of the metal shell 2 to prevent leakage magnetic flux from causing the stern shaft 1 to exhibit magnetism.

[0009] The bottom of the magnet mounting base 8 is connected to the hull 12; the magnet mounting base 8 is a key supporting component of the magnetic bearing module, and has axial, circumferential and radial adjustment functions, which can realize the position adjustment of the magnetic bearing module to better adapt to the possible deflection problem of the stern shaft 1. At the same time, the relative distance between the magnetic bearing module and the stern shaft 1 can be adjusted to set the magnetic suction force on the stern shaft 1.

[0010] The water-lubricated bearing 10 is a cylindrical structure, consisting of an outer shell made of metal material and an internal bearing shell made of polymer material, and is installed on the hull 12 near the propeller 11 through a bearing seat; further, the bearing shell material of the water-lubricated bearing 10 adopts a polymer material with good lubrication performance, including ultra-high molecular weight polyethylene, sialon, polyetheretherketone, polyimide, nylon, etc.; further, because the magnetic bearing module reduces the load of the water-lubricated bearing, the water-lubricated bearing 10 can adopt a short bearing design, thereby improving the dynamic stability of the water-lubricated bearing 10, while reducing the local wear problem caused by the deflection of the stern shaft 1.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] (1) The present invention structurally separates the permanent magnet and the water-lubricated bearing in the integral permanent magnet-water-lubricated composite bearing, thereby effectively eliminating the mutual constraints between the magnetic bearing module and the water-lubricated bearing module in terms of space, size, and performance, providing greater convenience for realizing the independent optimization design of each module, and greatly reducing the difficulty and cost of each link such as the design, manufacturing, assembly, operation and maintenance of each module.

[0013] (2) The present invention can improve the bearing capacity by increasing the number of permanent magnets in the permanent magnet array or optimizing the arrangement of the permanent magnet array, thereby significantly reducing the load of the water-lubricated bearing module and improving the lubrication state of the water-lubricated bearing. At the same time, the axial length of the water-lubricated bearing can be shortened to improve its dynamic stability and adaptability to shaft neck deflection, which is beneficial to improving the stern end wear effect caused by the eccentric load of the stern bearing, that is, the parallel joint bearing of the small aspect ratio water-lubricated bearing and the large magnetic force permanent magnet bearing module can better adapt to the heavy load and eccentric load conditions of the stern shaft system, ensuring that the stern shaft system has good dynamic stability.

[0014] (3) In the existing integral permanent magnet-water lubricated composite bearing, the magnetic bearing module, magnetic sleeve and bearing are assembled together and immersed in the working medium. They need to have magnetic properties, tribological properties and corrosion resistance, which requires extremely high material quality, is difficult to develop and is costly. In the present invention, the magnetic bearing module and magnetic sleeve are located in a sealed magnetic bearing cabin and are not in direct contact with the working medium. They will not contact each other under normal working conditions. Therefore, the material selection only needs to meet the magnetic performance requirements and basic strength requirements. Mature materials are available on the market, and the cost is greatly reduced.

[0015] (4) The magnetic bearing module of the present invention is equipped with a mechanical multi-directional and multi-dimensional adjustable base (magnet mounting base), which can be easily installed and debugged. At the same time, the magnetic force can be changed by adjusting the relative distance between the magnetic bearing module and the magnetic sleeve, and the axial distance between the water-lubricated bearing and the magnetic bearing module can be adjusted to optimize the shaft system load distribution, thereby avoiding the disadvantage that the integral permanent magnet-water-lubricated composite bearing cannot be adjusted once installed, and enhancing the flexibility of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The diagram is a schematic diagram of the arrangement of the stern shaft system of axially parallel split permanent magnet-water lubricated composite bearings according to an embodiment.

[0017] Figure 2 for Figure 1 A partial enlarged view of part A.

[0018] Figure 3 The present invention is a schematic structural diagram of a magnetic force bearing module of an axially parallel split permanent magnet-water lubricated composite bearing according to an embodiment.

[0019] Figure 4 The present invention is a schematic diagram of the cross-sectional structure of the magnetic force bearing module BB of an axially parallel split permanent magnet-water lubricated composite bearing according to an embodiment.

[0020] Figure 5 The present invention is a schematic diagram of the permanent magnet array structure of an axially parallel split permanent magnet-water lubricated composite bearing according to an embodiment.

[0021] Figure 6 The diagram is a schematic diagram of the arrangement of the permanent magnet array of an axially parallel split permanent magnet-water lubricated composite bearing according to an embodiment.

[0022] In the figure, 1 is the stern shaft, 2 is the metal shell, 3 is the positioning grid, 4 is the packaging layer, 5 is the anti-collision and wear tile, 6 is the permanent magnet array, 7 is the magnetic sleeve, 8 is the magnet mounting base, 9 is the dynamic sealing structure, 10 is the water-lubricated bearing, 11 is the propeller, 12 is the hull, and 13 is the working medium. DETAILED DESCRIPTION

[0023] The embodiments of the technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0024] As attached Figure 1 As shown, an axially parallel split permanent magnet-water lubricated composite bearing of an embodiment of the present invention is applied to a ship propulsion shaft system, and the entire system includes: a stern shaft 1, a magnetic bearing module, a magnetic sleeve 7, a magnet mounting base 8, a dynamic sealing structure 9, a water-lubricated bearing 10, a propeller 11, a hull 12, and a working medium 13.

[0025] When assembling the axially parallel split permanent magnet-composite water-lubricated bearings, the propeller 11 is fixedly connected to the sternmost end of the stern shaft 1. The magnetic bearing module and the water-lubricated bearing 10 are arranged axially parallel to each other along the stern shaft 1. The water-lubricated bearing 10 is installed in the stern bearing seat close to the propeller 11, and a dynamic sealing structure 9 is arranged between the bulkhead of the bow hull 12 and the stern shaft 1. The water-lubricated bearing 10 is arranged outside the dynamic sealing structure 9 on the side close to the propeller 11, and the whole is immersed in the working medium 13. The magnetic bearing module is arranged on the side of the dynamic sealing structure 9 away from the propeller 11, and is completely isolated from the working medium 13, which effectively prevents the permanent magnet from being corroded and failed by the medium, worn by mud and sand impurities, and parasitic contamination by marine microorganisms.

[0026] As attached Figure 2 To Attachment Figure 4 As shown, the magnetic bearing module includes a metal shell 2, a positioning grid 3 located in the metal shell 2, a permanent magnet array 6 located in the positioning grid 3, a packaging layer 4 located on the side of the positioning grid 3 and the permanent magnet array 6 close to the surface of the stern shaft 1, and anti-collision and wear tiles 5 located on both sides. The metal shell 2 is made of magnetic material and is a semi-cylindrical shell structure as a whole, and ear plate structures are processed on both sides. The entire magnetic bearing module is fixedly connected to the magnet mounting base 8 through the ear plates on both sides of the metal shell 2.

[0027] As attached Figure 5 and attached Figure 6 As shown, the positioning grid 3 in this embodiment is fixedly connected to the inner wall of the metal shell 2. The positioning grid 3 is provided with 32 permanent magnet mounting grooves with fan-shaped cross sections, four rows are evenly distributed along the axial direction of the stern shaft 1, and eight columns are evenly distributed along the radial direction. The curvature, width and other dimensional parameters of each mounting groove are precisely matched with the permanent magnet. In this embodiment, the permanent magnet material is neodymium iron boron, and a total of 32 suction-type permanent magnets with fan-shaped cross sections constitute a permanent magnet array 6. The permanent magnet array 6 relies on magnetic force to be adsorbed on the inner wall of the metal shell 2, and is embedded in the positioning grid 3 in a detachable form, which is convenient for the installation, positioning and later inspection and maintenance of the permanent magnet. In order to concentrate the magnetic lines of force mainly inside the permanent magnet to improve the magnetic force bearing capacity and form a certain magnetic shielding property outside the permanent magnet, an axially parallel split permanent magnet-water-lubricated composite bearing of an embodiment of the present invention adopts a Halbach array design: four permanent magnets along the axial direction of the stern shaft constitute a magnetic row, and its magnetization direction changes alternately in the horizontal and vertical directions to form a linear Halbach array; eight such magnetic rows are evenly distributed in the circumferential direction to form a fan-shaped Halbach array.

[0028] The encapsulation layer 4 in this embodiment is a fan-shaped ring structure, which provides basic protection for the permanent magnet array 6 together with the metal shell 2. The anti-collision and wear tiles 5 are fixed to the bow and stern ends of the magnetic force bearing. At the same time, the outer surface of the anti-collision and wear tiles 5 is fixed to the inner wall of the metal shell 2, and the inner surface faces the magnetic sleeve 7, and there is a certain radial air gap (C2) with the outer surface of the magnetic sleeve 7. In addition, the radial air gap (C2) between the anti-collision and wear tiles 5 and the magnetic sleeve 7 is slightly smaller than the radial air gap (C1) between the encapsulation layer 4 and the magnetic sleeve 7. This design ensures that under normal operating conditions, the anti-collision and wear tiles 5 will not contact the magnetic sleeve 7, and when abnormal vibration occurs in the stern shaft 1, the anti-collision and wear tiles 5 will serve as a safety barrier to prevent the magnetic sleeve 7 from rubbing and impacting the encapsulation layer 4 and the permanent magnet array 6, and the water-lubricated bearing 10 will promptly bear the load of the stern shaft 1 to ensure the safe operation of the system.

[0029] The magnetic sleeve 7 in this embodiment adopts a cylindrical structure design and is made of 45# steel material with excellent magnetic properties. The magnetic sleeve 7 is fixedly sleeved on the stern shaft 1 in a slightly interference fit manner, arranged at the bottom of the permanent magnet array 6, and keeps the same axis and center alignment with the permanent magnet array 6. This design ensures that the magnetic sleeve 7 can be fully magnetized and transmit the magnetic force to the stern shaft 1 through contact, thereby bearing the gravity load of the stern shaft 1 and the propeller 11, and achieving an excellent magnetic load-bearing effect.

[0030] The magnet mounting base 8 is a key supporting component of the magnetic bearing module, which is installed on the hull 12 of the ship. It has axial, circumferential and radial adjustment functions, and is equipped with adjustment guide rails in corresponding directions, which can realize fine control of magnetic force. Specifically, the axial adjustment function is used to adjust the magnetic force acting position of the magnetic bearing module on the stern shaft, and optimize the shaft system load distribution and improve the cantilever effect of the propeller 11 by adjusting the axial spacing between the magnetic bearing module and the water-lubricated bearing 10; the circumferential adjustment function is used to ensure the precise alignment of the permanent magnet array 6 and the magnetic sleeve 7 during the shaft system installation and calibration process to ensure the accuracy of the magnetic bearing direction; the radial adjustment function realizes the precise control of the magnetic bearing size by changing the air gap spacing between the packaging layer 4 and the magnetic sleeve 7; in addition, the radial adjustment function can form different air gap spacings between the inner surface of the bow and stern ends of the packaging layer 4 and the stern shaft 1, so that the permanent magnet array 6 inside the magnetic bearing module forms a small inclination angle relative to the horizontal plane, resulting in non-uniformly distributed magnetic bearing, further alleviating the cantilever effect of the propeller 11.

[0031] The water-lubricated bearing 10 is a cylindrical structure, the outer layer of which is a shell made of metal material, and the inner layer is a bearing liner made of polymer material. The bearing liner is made of ultra-high molecular weight polyethylene, sialon, polyetheretherketone, polyimide, nylon and other materials with good lubrication performance. During the design stage of the axially parallel split permanent magnet-water-lubricated composite bearing of an embodiment of the present invention, those skilled in the art can increase the proportion of the magnetic bearing of the bearing according to factors such as the weight and working load of the stern shaft 1 and its attached propeller 11, while appropriately reducing the axial length of the water-lubricated bearing 10, to achieve large magnetic bearing, small water film bearing, and contactless bearing, taking into account the bearing capacity, dynamic performance and shafting stability of the bearing, and ensuring the stability of the ship's operation and service life.

[0032] An axially parallel split permanent magnet-water lubricated composite bearing of an embodiment of the present invention realizes axially parallel joint support of the stern shaft 1 and the propeller 11 through the synergistic effect of the permanent magnet array 6 and the water lubricated bearing 10. When the bearing works in an underwater environment, the permanent magnet array 6 applies a vertical upward magnetic attraction to the stern shaft 1 through the magnetic sleeve 7, and bears part of the load of the stern shaft 1 and the propeller 11; at the same time, the lubricating water film formed in the radial gap of the water lubricated bearing 10 generates fluid dynamic pressure, realizing the joint load of fluid dynamic pressure and magnetic force. For large-scale ship propulsion shaft systems, the radial adjustment function of the magnet mounting base 8 can be used to change the radial air gap between the permanent magnet array 6 and the magnetic sleeve 8, or the axial adjustment function can be used to change the magnetic force action position of the magnetic bearing module on the stern shaft, thereby adjusting the axial spacing between the water-lubricated bearing and the magnetic bearing module to increase the magnetic bearing weight of the axially parallel split permanent magnet-composite water-lubricated bearing, reduce the friction contact between the bearing shell of the water-lubricated bearing 10 and the journal of the stern shaft 1, optimize the shaft system load distribution, and improve the journal inclination caused by the overhang of the propeller 11.

[0033] It should be noted that the above content is only a preferred embodiment of the present invention, and its description is relatively specific, but it is not intended to limit the scope of the present invention. After reading the present invention, those skilled in the art can implement various adjustments and optimizations without departing from the basic spirit of the present invention, and these improvements should be regarded as belonging to the protection scope of the present invention. Therefore, the protection scope of the present invention should be defined according to the claims.

Claims

1. An axially parallel split permanent magnet-water lubricated composite bearing, characterized in that: The split permanent magnet-water lubricated composite bearing comprises a magnetic bearing module, a magnetic sleeve (7), a magnet mounting base (8) and a water lubricated bearing (10); the magnetic bearing module and the water lubricated bearing (10) are arranged in parallel along the axial direction of the stern shaft (1), and a dynamic sealing structure (9) is provided between the hull (12) and the stern shaft (1) between the magnetic bearing module and the water lubricated bearing (10); the water lubricated bearing (10) is arranged outside the dynamic sealing structure (9) on one side close to the propeller (11), and is immersed in a working medium (13) as a whole; The magnetic force bearing module comprises a metal shell (2), a positioning grid (3) located in the metal shell (2), a permanent magnet array (6) located in the positioning grid (3), a packaging layer (4) located on the side of the positioning grid 3 and the permanent magnet array (6) close to the surface of the stern shaft (1), and anti-collision and wear tiles (5) located on both sides; the magnetic force bearing module is arranged on a side of the dynamic sealing structure (9) away from the propeller (11) and is completely isolated from the working medium (13).

2. The axially parallel split permanent magnet-water lubricated composite bearing according to claim 1 is characterized in that: In the magnetic force bearing module: the metal shell (2) is made of magnetic material and is a semi-cylindrical shell structure, with ear plates processed on both sides, and is fixedly connected to the magnet mounting base (8) through the ear plates; the positioning grid (3) is used for the installation and positioning of the permanent magnet array (6), and is fixedly connected to the inner wall surface of the metal shell (2); the permanent magnets are adsorbed on the inner wall surface of the metal shell (2) by magnetic force, and are arranged in the positioning grid (3) to form a permanent magnet array (6); the arrangement mode of the permanent magnet array (6) and the parameters of a single permanent magnet are obtained through calculation and analysis according to actual use requirements to meet the requirements of the entire system for the magnetic force; the packaging layer (4) covers the positioning grid (3) and the permanent magnet array (6) on the side close to the surface of the stern shaft (1), and uses non-magnetic polymer materials to protect the permanent magnets.

3. The axially parallel split permanent magnet-water lubricated composite bearing according to claim 1 is characterized in that: The magnetic bearing module further comprises anti-collision and wear tiles (5) located on both sides of the magnetic bearing module. The outer surface of the anti-collision and wear tiles (5) is fixed to the inner side of the metal shell (2), and the other side faces the magnetic sleeve (7).

4. The axially parallel split permanent magnet-water lubricated composite bearing according to claim 4 is characterized in that: There is a gap C2 between the inner surface of the anti-collision and wear tile (5) and the outer surface of the magnetic sleeve (7), and C2 is smaller than the gap C1 between the packaging layer (4) and the outer surface of the magnetic sleeve (7), ensuring that when the stern shaft (1) is subjected to an abnormal load, the magnetic sleeve (7) first collides or rubs against the anti-collision and wear tile (5), thereby protecting the packaging layer (4) and the permanent magnet array (6).

5. The axially parallel split permanent magnet-water lubricated composite bearing according to claim 1 is characterized in that: The magnetic sleeve (7) is made of a highly permeable magnetic material and is of a cylindrical structure as a whole. It is mounted on the stern shaft (1) by a light interference fit. The magnetic field of the permanent magnet array (6) acts on the magnetic sleeve (7) and is then transmitted to the stern shaft (1) by the magnetic sleeve (7) through contact, thereby partially bearing the gravity load on the stern shaft (1) and the propeller (11), and ultimately reducing the load effect of the stern shaft (1) on the water-lubricated bearing (10). The axial length of the magnetic sleeve (7) is greater than the axial length of the metal shell (2) to prevent leakage magnetic flux from causing the stern shaft (1) to exhibit magnetism.

6. The axially parallel split permanent magnet-water lubricated composite bearing according to claim 1, characterized in that: The bottom of the magnet mounting base (8) is connected to the hull (12); the magnet mounting base (8) is a key supporting component of the magnetic bearing module, and has axial, circumferential and radial adjustment functions to achieve position adjustment of the magnetic bearing module. At the same time, the relative distance between the magnetic bearing module and the stern shaft (1) can be adjusted to set the magnitude of the magnetic suction force on the stern shaft (1).

7. The axially parallel split permanent magnet-water lubricated composite bearing according to claim 1, characterized in that: The water-lubricated bearing (10) is a cylindrical structure, consisting of an outer shell made of metal material and an inner bearing bush made of polymer material, and is installed on the hull (12) close to the propeller (11) through a bearing seat.

8. The axially parallel split permanent magnet-water lubricated composite bearing according to claim 1 is characterized in that: The anti-collision and wear tiles (5) are made of high molecular materials with good elasticity and anti-friction and wear properties, including ultra-high molecular weight polyethylene, thiamone, polyetheretherketone, polyimide, and nylon.

9. The axially parallel split permanent magnet-water lubricated composite bearing according to claim 1, characterized in that: The water-lubricated bearing (10) can be designed with a short bearing structure, and its bearing bush material is made of a polymer material with good lubrication performance.

10. An axially parallel split permanent magnet-water lubricated composite bearing according to any one of claims 1 to 9, characterized in that: The split permanent magnet-water lubricated composite bearing is applied to a ship propulsion shaft system, and realizes axial parallel joint support of a stern shaft (1) and a propeller (11) through the synergistic effect of a permanent magnet array (6) and a water lubricated bearing (10).

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