Axially parallel split type permanent magnet-water lubrication composite bearing

Abstract

The application provides an axial parallel split type permanent magnet-water lubrication composite bearing, belongs to the technical field of bearing design, and is applied to a ship propulsion shaft system, comprising a magnetic force bearing module, a magnetic shaft sleeve, a magnet mounting base and a water lubrication bearing. The magnetic force bearing module and the water lubrication bearing are arranged in parallel along the stern shaft in the axial direction; the water lubrication bearing is arranged on the side close to the propeller and is entirely immersed in the working medium; the magnetic shaft sleeve with a cylindrical structure is installed on the stern shaft and is subjected to the suction force under the action of the permanent magnet array in the magnetic force bearing module; the magnet mounting base is used for supporting the magnetic force bearing module and regulating and controlling the magnetic force. The permanent magnet in the integral type permanent magnet-water lubrication composite bearing is split in structure from the water lubrication bearing, the mutual restriction of the magnetic force bearing module and the water lubrication bearing module in space, size and performance can be effectively eliminated, the use flexibility is enhanced, the bearing distribution of the shaft system can be optimized, and the good dynamic stability of the stern shaft system is ensured.

Description

TECHNICAL FIELD

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

[0002] The stern bearing is a key component of the ship propulsion shafting, and bears the important functions of supporting and lubricating the shafting. The water lubrication stern bearing uses natural water as the lubricating medium, and has the advantages of environmental friendliness and simple structure. However, the viscosity of water is much lower than that of the traditional lubricating oil, and the bearing carrying capacity is proportional to the viscosity. Therefore, under the same conditions, the carrying capacity of the water lubrication bearing is significantly lower than that of the oil lubrication bearing. When the shafting is in the low-speed or start-stop working condition, the fluid dynamic pressure effect is weakened, and the above problem becomes more prominent. At this time, the water film thickness between the shaft neck and the bushing is in the same order of magnitude as the surface roughness of the friction pair, so that the bearing is in a mixed lubrication state, which easily causes serious friction and wear, and sometimes also causes vibration and noise problems. In addition, with the continuous development of modern ships towards large-scale, the gravity and thrust of the propeller during work are increasing, which on the one hand will cause the bearing load to increase greatly, and on the other hand, the propeller suspension load will cause the stern shaft to bend and deform and to deviate, so that the shaft neck and the bushing produce local solid contact at the edge, thereby causing more serious friction and wear or vibration and noise problems, and 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 requirement of the stern bearing is very high, and the working condition also needs to be adjusted according to the task, which limits the application of the static pressure water lubrication bearing or the dynamic-static pressure water lubrication bearing, and once the water lubrication stern bearing has a problem, the influence may be disastrous.

[0003] Benefiting from the rapid development of rare earth permanent magnet materials in China, a design of permanent magnet-water lubrication composite bearing is proposed, the core idea of which is to arrange a certain number of permanent magnets in the traditional water lubrication bearing bush lining, so as to exert magnetic force on the magnetic shaft sleeve on the stern shaft by the permanent magnets, so that the load exerted on the bearing bush by the stern shaft is greatly reduced, thereby greatly improving the lubrication state of the water lubrication stern bearing, effectively reducing the friction and wear of the water lubrication stern bearing, and improving the service life thereof. However, the permanent magnets and the bearing in the above-mentioned permanent magnet-water lubrication composite bearing are integrally combined, which is subject to many limitations in design and use. First, the integrally combined permanent magnet-water lubrication composite bearing needs to arrange different functional modules in a limited space, which inevitably interferes and limits each other, and the installation difficulty of the permanent magnets is also increased; second, the proportion of magnetic force bearing in the integrally combined permanent magnet-water lubrication composite bearing is fixed after manufacturing, which lacks adjustability when facing different working conditions, and sometimes the dynamic instability phenomenon occurs due to the excessive proportion of magnetic force; finally, the magnetic shaft sleeve in the integrally combined permanent magnet-water lubrication composite bearing is not only the receptor of magnetic force, but also the friction pair that grinds against the shaft neck, so the material thereof must consider the corrosion and corrosion resistance, good magnetism and tribology, which brings great challenges to the development and processing of related materials. Therefore, it is urgent to make innovative design according to the characteristics of the water lubrication stern bearing. SUMMARY

[0004] The purpose of the present application is to provide an axial parallel split type permanent magnet-water lubrication composite bearing, which overcomes the structural limitations in the design of the integrally combined permanent magnet-water lubrication composite bearing, improves the working condition adaptability of the bearing, reduces the requirements of the bearing material and the difficulty of manufacturing, processing and installation of the bearing. The present application can provide a more excellent stern bearing for marine equipment, improve its running stability and reliability, and prolong the service life of the key components.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] An axial parallel split type permanent magnet-water lubrication composite bearing, which is applied to a ship propulsion shafting, comprises a magnetic force bearing module, a magnetic shaft sleeve 7, a magnet mounting base 8 and a water lubrication bearing 10. The magnetic force bearing module and the water lubrication bearing 10 are arranged axially in parallel along the stern shaft 1, and a dynamic sealing structure 9 is arranged between the hull 12 and the stern shaft 1 between the magnetic force bearing module and the water lubrication bearing 10. The magnetic force 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 corrosion of the medium, the wear of impurities and the pollution of marine organisms of the magnetic force bearing module; the water lubrication bearing 10 is arranged on the side of the dynamic sealing structure 9 close to the propeller 11, and is completely immersed in the working medium 13.

[0007] 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, an encapsulation layer 4 located on the side close to the surface of the propeller shaft 1 of the positioning grid 3 and the permanent magnet array 6, and anti-collision and anti-friction blocks 5 located on both sides; the metal shell 2 is made of a magnetic material and has a semi-cylindrical shell structure, and ear plate structures are formed on both sides to be fixedly connected with a magnet mounting base 8 through the ear plates; the positioning grid 3 is used for mounting and positioning the permanent magnet array 6 and is fixedly connected with the inner side wall surface of the metal shell 2; the permanent magnets are adsorbed on the inner side wall surface of the metal shell 2 by magnetic force, arranged in the positioning grid 3, and form the 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 on the magnetic force size; the encapsulation layer 4 is located on the side close to the surface of the propeller shaft 1 of the positioning grid 3 and the permanent magnet array 6, is made of a non-magnetic high polymer material, and protects the permanent magnets as needed; the anti-collision and anti-friction blocks 5 are made of a high polymer material with good elasticity and anti-friction and wear resistance, and specific materials can be selected from ultrahigh molecular weight polyethylene, sailon, polyether ether ketone, polyimide, nylon, etc.; the outer surface of the anti-collision and anti-friction blocks 5 is fixed to the inner side wall surface of the metal shell 2, the inner surface thereof has a certain gap C2 with the outer surface of a magnetic shaft sleeve 7, C2 is slightly smaller than a gap C1 between the encapsulation layer 4 and the outer surface of the magnetic shaft sleeve 7, and the magnetic shaft sleeve 7 is first collided or rubbed with the anti-collision and anti-friction blocks 5 when the propeller shaft 1 suffers abnormal load, so as to protect the encapsulation layer 4 and the permanent magnet array 6.

[0008] The magnetic shaft sleeve 7 is made of a high-permeability magnetic material and has a cylindrical structure, is installed on the propeller shaft 1 in a slight interference fit, the magnetic field of the permanent magnet array 6 acts on the magnetic shaft sleeve 7, the magnetic shaft sleeve 7 transmits the force to the propeller shaft 1 through contact, thereby partially bearing the gravity load of the propeller shaft 1 and the propeller 11, finally reducing the load of the propeller shaft 1 on the water-lubricated bearing 10; the axial length of the magnetic shaft sleeve 7 is greater than that of the metal shell 2 to prevent leakage of magnetic flux and make the propeller shaft 1 exhibit magnetism.

[0009] The bottom of the magnet mounting base 8 is connected with a ship body 12; the magnet mounting base 8 is a key supporting component of the magnetic force bearing module, has axial, circumferential and radial adjustment functions, can realize position adjustment of the magnetic force bearing module, better adapt to possible deflection of the propeller shaft 1, and can set the suction force of the magnetic force on the propeller shaft 1 by adjusting the relative distance between the magnetic force bearing module and the propeller shaft 1.

[0010] The water-lubricated bearing 10 is a cylindrical structure, which is composed of a metal shell and a high polymer material inner bearing bush, and is installed on the hull 12 close to the propeller 11 through a bearing seat; further, the bearing bush material of the water-lubricated bearing 10 adopts a high polymer material with good lubricating performance, including ultrahigh molecular weight polyethylene, siron, polyether ether ketone, polyimide, nylon and the like; further, since the magnetic force 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, and reducing the local wear problem caused by the deflection of the stern shaft 1.

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

[0012] (1) The present application effectively eliminates the mutual restriction of the magnetic force bearing module and the water-lubricated bearing module in space, size and performance by splitting the permanent magnet and the water-lubricated bearing in the integrated permanent magnet-water-lubricated composite bearing, which provides greater convenience for independent optimization design of each module, and greatly reduces the difficulty and cost of each link such as design, manufacturing, assembly and operation and maintenance of each module.

[0013] (2) The present application can improve the carrying capacity by increasing the number of permanent magnets of the permanent magnet array or optimizing the arrangement mode of the permanent magnet array, so that the load of the water-lubricated bearing module is greatly reduced, and the lubrication state of the water-lubricated bearing is improved. At the same time, the dynamic stability and adaptability to shaft neck deflection of the water-lubricated bearing can be improved by shortening the axial length of the water-lubricated bearing, which is beneficial to improve the stern bearing eccentric wear effect caused by eccentric load, that is, the parallel combined bearing of the small length-diameter ratio water-lubricated bearing and the large magnetic force permanent magnet bearing module can better adapt to the heavy load and eccentric load working condition of the stern shaft system, and ensure good dynamic stability of the stern shaft system.

[0014] (3) In the existing integrated permanent magnet-water-lubricated composite bearing, the magnetic force bearing module, the magnetic shaft sleeve and the bearing are combined together, and are all immersed in the working medium, which requires high magnetic performance, tribological performance and corrosion resistance, and has high material requirements, great development difficulty and high cost. In the present application, the magnetic force bearing module and the magnetic shaft sleeve are located in the sealed magnetic force bearing cabin and do not directly contact with the working medium, and do not contact with each other under normal working conditions, so the material selection only needs to meet the requirements of magnetic performance and basic strength, and there are mature materials on the market, which greatly reduces the cost.

[0015] (4) The magnetic bearing module in this invention is equipped with a mechanically adjustable multi-directional and multi-dimensional base (magnet mounting base), which facilitates installation and debugging. At the same time, the magnetic force can be changed by adjusting the relative distance between the magnetic bearing module and the magnetic bushing, and the bearing distribution of the shaft system can be optimized by adjusting the axial distance between the water-lubricated bearing and the magnetic bearing module. This avoids the disadvantage that the integral permanent magnet-water-lubricated composite bearing is not adjustable once installed, and enhances the flexibility of use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the stern shaft arrangement of a split permanent magnet-water lubricated composite bearing with axially parallel components, according to one embodiment.

[0017] Figure 2 for Figure 1 A magnified view of part A in the middle.

[0018] Figure 3 This is a schematic diagram of an axially parallel split permanent magnet-water lubricated composite bearing magnetic load-bearing module structure according to one embodiment.

[0019] Figure 4 This is a cross-sectional schematic diagram of a split permanent magnet-water lubricated composite bearing magnetic load-bearing module BB, arranged axially in parallel, according to one embodiment.

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

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

[0022] In the diagram, 1 is the stern shaft, 2 is the metal outer shell, 3 is the positioning grid, 4 is the encapsulation layer, 5 is the anti-collision and abrasion pad, 6 is the permanent magnet array, 7 is the magnetic bushing, 8 is the magnet mounting base, 9 is the dynamic seal structure, 10 is the water-lubricated bearing, 11 is the propeller, 12 is the hull, and 13 is the working medium. Detailed Implementation

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

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

[0025] When assembling the split type axial parallel permanent-magnetic and water-lubricated composite bearing, the propeller 11 is fixedly connected to the most aft end of the stern shaft 1. The magnetic force bearing module and the water-lubricated bearing 10 are arranged in axial parallel 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 bow bulkhead of the hull 12 and the stern shaft 1 at the bow end of the water-lubricated bearing 10. The water-lubricated bearing 10 is arranged on the side close to the propeller 11 outside the dynamic sealing structure 9 and is entirely immersed in the working medium 13. The magnetic force bearing module is arranged on the side away from the propeller 11 outside the dynamic sealing structure 9 and is separated from the working medium 13, thereby effectively preventing the permanent magnet from being corroded by the medium, worn by the impurities and parasitically polluted by the marine microorganisms.

[0026] As shown in the accompanying drawings Figure 2 to the accompanying drawings Figure 4 , 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, an encapsulation layer 4 located on the side close to the surface of the stern shaft 1 of the positioning grid 3 and the permanent magnet array 6, and anti-collision and wear tiles 5 located on both sides. The metal shell 2 is processed from a magnetic material and has a semi-cylindrical shell structure. Ear plate structures are processed on both sides of the metal shell 2. The entire magnetic force 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 shown in the accompanying drawings Figure 5 and the accompanying drawings Figure 6 , the positioning grid 3 in the embodiment is fixedly connected to the inner side wall surface of the metal shell 2. The positioning grid 3 is provided with 32 permanent magnet mounting slots with a sector ring cross section, which are evenly distributed in four rows along the axial direction of the stern shaft 1 and eight columns along the radial direction. The arc and width of each mounting slot are accurately matched with the permanent magnet. In the embodiment, the permanent magnet material is neodymium iron boron, and a total of 32 sector ring cross section suction type permanent magnets are arranged to form the permanent magnet array 6. The permanent magnet array 6 is adsorbed on the inner side wall surface of the metal shell 2 by magnetic force and is embedded in the positioning grid 3 in a detachable form, thereby facilitating the installation and positioning of the permanent magnet and the later maintenance. In order to mainly concentrate the magnetic force lines in the inner side of the permanent magnet to improve the magnetic force bearing capacity and form a certain magnetic shielding property on the outer side of the permanent magnet, the axial parallel split type permanent-magnetic and water-lubricated composite bearing of one embodiment of the application adopts a Halbach array design: four permanent magnets in the axial direction of the stern shaft form a magnetic row, the magnetization direction of which alternately changes 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 sector ring Halbach array.

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

[0029] The magnetic shaft sleeve 7 in this embodiment adopts a cylindrical structure design and is made of 45 steel material with excellent magnetic properties. The magnetic shaft 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 coaxial with the permanent magnet array 6. This design ensures that the magnetic shaft sleeve 7 can be fully magnetized and transmit magnetic force to the stern shaft 1 through contact, thereby bearing the gravity load of the stern shaft 1 and the propeller 11, achieving excellent magnetic bearing effect.

[0030] The magnet mounting base 8 is a key supporting component of the magnetic bearing module, installed on the hull 12 of the ship, and has axial, circumferential and radial adjustment functions, and is provided with adjustment guide rails in corresponding directions, which can realize fine adjustment and control of the 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 by adjusting the axial spacing between the magnetic bearing module and the water-lubricated bearing 10, the shafting load distribution is optimized, and the cantilever effect of the propeller 11 is improved; the circumferential adjustment function is used to ensure the accurate alignment of the permanent magnet array 6 and the magnetic shaft sleeve 7 during shafting installation and calibration, to ensure the accuracy of the magnetic bearing direction; the radial adjustment function realizes accurate control of the magnetic bearing size by changing the air gap spacing between the packaging layer 4 and the magnetic shaft sleeve 7; in addition, the radial adjustment function can form different air gap spacings between the inner surfaces 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, generating a non-uniformly distributed magnetic bearing, further relieving the cantilever effect of the propeller 11.

[0031] The water-lubricated bearing 10 is a cylindrical structure, the outer layer of which is an outer shell made of metal material, and the inner layer of which is a bearing bush lining layer made of high polymer material. The bearing bush lining layer is made of materials with good lubricating properties, such as ultra-high molecular weight polyethylene, sylon, polyether ether ketone, polyimide, nylon, etc. In the design stage of the axial parallel split type permanent magnet-water-lubricated composite bearing of one embodiment of the present application, the personnel in the field can increase the proportion of magnetic force bearing of the bearing while appropriately reducing the axial length of the water-lubricated bearing 10 according to factors such as the weight and working load of the propeller shaft 1 and its attached propeller 11, so as to realize large magnetic force bearing, small water film bearing and non-contact bearing, and to balance the bearing bearing capacity, dynamic performance and shafting stability, so as to ensure the stability and service life of the ship in operation.

[0032] The axial parallel split type permanent magnet-water-lubricated composite bearing of one embodiment of the present application realizes the axial parallel combined support of the propeller 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 the underwater environment, the permanent magnet array 6 applies a vertical upward magnetic attraction force to the propeller shaft 1 through the magnetic shaft sleeve 7, and bears part of the load of the propeller shaft 1 and the propeller 11; at the same time, the fluid dynamic pressure generated by the lubricating water film formed in the radial gap of the water-lubricated bearing 10 realizes the combined bearing of fluid dynamic pressure and magnetic force. For large-scale ship propulsion shafting, 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 shaft sleeve 8, or the axial adjustment function can be used to change the magnetic force acting position of the magnetic force bearing module on the propeller shaft, so as to adjust the axial spacing of the water-lubricated bearing and the magnetic force bearing module, increase the magnetic force bearing proportion of the axial parallel split type permanent magnet-composite water-lubricated bearing, reduce the frictional contact between the bearing bush of the water-lubricated bearing 10 and the journal of the propeller shaft 1, optimize the bearing load distribution of the shafting, and improve the journal inclination caused by the overhanging of the propeller 11.

[0033] It should be noted that the above content is only a preferred embodiment of the present application, which is described in more detail, but is not intended to limit the scope of the present application. Those skilled in the art can make various adjustments and optimizations to the present application without departing from the basic spirit of the present application after reading the present application, and these improvements should be considered as belonging to the protection scope of the present application. Therefore, the protection scope of the present application should be defined according to the claims.

Claims

1. A split-type permanent magnet-water lubricated composite bearing with axially parallel components, characterized in that, The split permanent magnet-water lubricated composite bearing includes a magnetic bearing module, a magnetic bushing (7), a magnet mounting base (8), and a water lubricated bearing (10); the magnetic bearing module and the water lubricated bearing (10) are arranged side by side along 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 the side close to the propeller (11), and is completely immersed in the working medium (13); The magnetic bearing module includes a metal shell (2), a positioning grid (3) located inside the metal shell (2), a permanent magnet array (6) located inside the positioning grid (3), an encapsulation layer (4) located on the side of the positioning grid (3) and the permanent magnet array (6) near the stern shaft (1) surface, and anti-collision and abrasion blocks (5) located on both sides; 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); The magnetic bearing module also includes anti-collision and abrasion blocks (5), located on both sides of the magnetic bearing module. The outer surface of the anti-collision and abrasion blocks (5) is fixed to the inner side of the metal shell (2), and the other side faces the magnetic bushing (7). There is a gap C2 between the inner surface of the anti-collision and abrasion tile (5) and the outer surface of the magnetic bushing (7), and C2 is smaller than the gap C1 between the encapsulation layer (4) and the outer surface of the magnetic bushing (7), ensuring that when the stern shaft (1) is subjected to abnormal load, the magnetic bushing (7) will first collide or rub against the anti-collision and abrasion tile (5), thereby protecting the encapsulation layer (4) and the permanent magnet array (6); The magnetic bushing (7) is made of a highly permeable magnetic material and has a cylindrical structure. 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 bushing (7) and is then transmitted to the stern shaft (1) through contact. This partially bears the gravitational load on the stern shaft (1) and the propeller (11), and ultimately reduces the load on the water-lubricated bearing (10) from the stern shaft (1). The axial length of the magnetic bushing (7) is greater than the axial length of the metal shell (2) to prevent leakage magnetism that would cause the stern shaft (1) to exhibit magnetism. The metal shell (2) is fixedly connected to the magnet mounting base (8). The magnet mounting base (8) is a key support component of the magnetic bearing module. It has axial, circumferential and radial adjustment functions to realize the position adjustment of the magnetic bearing module. At the same time, it can set the magnitude of the magnetic attraction force on the stern shaft (1) by adjusting the relative distance between the magnetic bearing module and the stern shaft (1).

2. The axially parallel split permanent magnet-water lubricated composite bearing according to claim 1, characterized in that: In the magnetic bearing module: the metal shell (2) is made of magnetic material and has a semi-cylindrical shell structure with ear plates on both sides, which are 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 magnets are magnetically attracted to the inner wall of the metal shell (2) and arranged in the positioning grid (3) to form the permanent magnet array (6); the arrangement of the permanent magnet array (6) and the parameters of a single permanent magnet are obtained by calculation and analysis according to the actual use requirements to meet the requirements of the entire system for the magnitude of the magnetic force; the encapsulation layer (4) covers the positioning grid (3) and the permanent magnet array (6) on the side near the stern shaft (1) and is made of non-magnetic polymer material to protect the permanent magnets.

3. 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).

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

5. The axially parallel split-type permanent magnet-water lubricated composite bearing according to claim 1, characterized in that: The anti-collision and abrasion tile (5) is made of a high-molecular material with good elasticity and anti-friction and wear resistance, including ultra-high molecular weight polyethylene, silane, polyether ether ketone, polyimide, and nylon.

6. The axially parallel split permanent magnet-water lubricated composite bearing according to claim 1, characterized in that: The water-lubricated bearing (10) adopts a short bearing structure design, and its bearing material is a high-molecular material with good lubrication performance.

7. A split-type permanent magnet-water lubricated composite bearing with axial parallel arrangement as described in any one of claims 1-6, characterized in that: The split permanent magnet-water lubricated composite bearing is applied to the ship propulsion shaft system. Through the synergistic effect of the permanent magnet array (6) and the water lubricated bearing (10), it achieves axial parallel joint support for the stern shaft (1) and the propeller (11).

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