A magnetic force regulating device for permanent magnetic water-lubricated bearings

Abstract

The present invention discloses a magnetic force adjustment device for a permanent magnetic water-lubricated bearing, comprising a front retainer, a rear retainer, and a magnetic metal sheet; the front retainer has an arc-shaped cross-section, a flange at the front end, and M axial slots uniformly distributed along the circumferential direction on the outer side of the front retainer, with N magnetic metal sheets uniformly distributed along the axial direction in each slot; the rear retainer has the same structure and shape as the front retainer and is symmetrical with the front retainer; each magnetic metal sheet is made of metals with different magnetic permeabilities. The present invention can adjust the magnetic force and uniformity of the permanent magnetic water-lubricated bearing by designing the front retainer, the rear retainer, and the magnetic metal sheet in the permanent magnetic water-lubricated bearing structure. The present invention can adjust the bearing magnetic force deviation caused by the residual magnetism deviation of each magnetic steel piece by designing the magnetic metal sheet according to the actual bearing magnetic steel dimensions.

Description

Technical Field

[0001] The invention relates to a magnetic force regulating device, in particular to a magnetic force regulating device for a permanent magnetic water-lubricated bearing. Background Art

[0002] The stern bearings of large ships, warships, and other underwater vehicles typically use water-lubricated rubber bearings. However, due to the low viscosity and limited load-bearing capacity of water, water films can easily break under low-speed, heavy-load conditions, exacerbating bearing wear and shortening bearing life. In recent years, a new type of bearing, the permanent magnetic water-lubricated bearing, has emerged. Its basic design utilizes magnetic force to replace some of the bearing's fluid loads, increasing the stern bearing's load limit and making it more suitable for heavy-load environments.

[0003] However, when manufacturing permanent magnet water-lubricated bearings, the magnetic force is provided by a magnetic array composed of multiple arc-shaped magnets. After selecting the magnet grade, the actual remanence of each magnet is within the remanence range specified in GB / T 13560-2017. However, the magnets in permanent magnet water-lubricated bearings are large, and the remanence differences between individual magnets lead to uneven magnetic fields in the magnet array, and the magnetic force varies significantly from the designed value, affecting the bearing's operating stability. Summary of the Invention

[0004] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a magnetic force adjustment device for permanent magnet water-lubricated bearings, which can adjust the problems of uneven magnetic field and inaccurate magnetic force of the magnetic steel array composed of the permanent magnet water-lubricated bearings caused by manufacturing errors of the magnetic steel. Furthermore, it can realize the adjustment of the magnetic force bearing capacity of the permanent magnet water-lubricated bearings.

[0005] To achieve the above-mentioned object, the technical solution of the present invention is as follows: a magnetic force regulating device for a permanent magnetic water-lubricated bearing, comprising a front retainer, a rear retainer and a magnetic conductive metal sheet;

[0006] The cross-section of the front holder is an arc shape, the front end of the front holder is a flange, the outer side of the front holder is uniformly distributed along the circumferential direction with M axial slots, and each slot is uniformly distributed along the axial direction with N magnetic conductive metal sheets;

[0007] The structure and shape of the rear retainer are the same as those of the front retainer, and are symmetrical with the front retainer;

[0008] The flange of the front retainer is fixed to the front end of the bearing; the flange of the rear retainer is fixed to the rear end of the bearing; the front retainer and the rear retainer are butted together inside the bearing to form a retainer;

[0009] Each magnetic metal sheet is made of metals with different magnetic permeabilities. The magnetic permeability of the magnetic metal sheet is determined by testing the actual magnetic force results of each magnetic steel; or after obtaining the magnetic force distribution at different positions of the bearing through test bench testing, the actual magnetic field results are input into the simulation software with the help of simulation software, and the magnetic permeability of the magnetic metal sheets at different positions on the retaining frame is determined through simulation.

[0010] Furthermore, the arc angle of the retaining frame is determined according to the overall circumferential arc of the actual magnetic steel array, and the value range is 90° to 120°.

[0011] Furthermore, the retaining frame is installed in the bearing and is symmetrical about the axial center cross section of the bearing.

[0012] Furthermore, M is the number of slots in the circumferential direction of the retainer, which is determined according to the number of magnetic steels in the circumferential direction of the actual bearing, and N is the number of magnetic metal sheets placed in each slot in the axial direction of the retainer, which is determined according to the number of magnetic steels in the axial direction of the bearing.

[0013] Furthermore, the outer dimensions of the retaining frame match the dimensions of the bearing.

[0014] Furthermore, the outer dimensions of the magnetic conductive metal sheet match the dimensions of the bearing and the retaining frame.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention can adjust the magnetic force and uniformity of the permanent magnetic water-lubricated bearing by designing a front cage, a rear cage and a magnetic conductive metal sheet in the permanent magnetic water-lubricated bearing structure;

[0017] 2. The present invention can adjust the bearing magnetic force deviation caused by the residual magnetism deviation of each magnetic steel one by one by designing the magnetic conductive metal sheet according to the actual external dimensions of the bearing magnetic steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram (exploded view) of the installation position of the present invention on a permanent magnetic water-lubricated bearing.

[0019] Figure 2 It is a schematic diagram of the overall structure of the magnetic adjustment device of the present invention.

[0020] Figure 3 Detailed schematic diagram of the front retainer in the present invention.

[0021] Figure 4 Detailed schematic diagram of the rear retainer in the present invention.

[0022] Figure 5 Detailed schematic diagram of the magnetic conductive metal sheet in the present invention.

[0023] In the figure: 1. Front cage; 2. Permanent magnetic water-lubricated bearing; 3. Rear cage; 4. Magnetic metal sheet. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] like Figure 1-5 As shown, a magnetic force regulating device for a permanent magnetic water-lubricated bearing comprises a front retainer 1, a rear retainer 3 and a magnetic conductive metal sheet 4;

[0026] The cross-section of the front holder 1 is an arc shape, the front end of the front holder 1 is a flange, the outer side of the front holder 1 is uniformly distributed along the circumferential direction with M axial slots, and each slot is uniformly distributed along the axial direction with N magnetic conductive metal sheets 4;

[0027] The structure and shape of the rear retainer 3 are the same as those of the front retainer 1, and are symmetrical with the front retainer 1;

[0028] The flange of the front retainer 1 is fixed to the front end of the permanent magnetic water-lubricated bearing 2; the flange of the rear retainer 3 is fixed to the rear end of the permanent magnetic water-lubricated bearing 2; the front retainer 1 and the rear retainer 3 are connected inside the permanent magnetic water-lubricated bearing 2 to form a retainer;

[0029] Each magnetic metal sheet 4 is made of metals with different magnetic permeabilities. The magnetic permeability of the magnetic metal sheet 4 is determined by testing the actual magnetic force results of each magnetic steel; or after obtaining the magnetic force distribution at different positions of the permanent magnetic water-lubricated bearing 2 through test bench testing, the actual magnetic field results are input into the simulation software with the help of simulation software, and the magnetic permeability of the magnetic metal sheets 4 at different positions on the retaining frame is determined through simulation.

[0030] Furthermore, the arc angle of the retaining frame is determined according to the overall circumferential arc of the actual magnetic steel array, and the value range is 90° to 120°.

[0031] Furthermore, the retaining frame is installed in the permanent magnetic water-lubricated bearing 2 and is symmetrical about the axial center cross section of the permanent magnetic water-lubricated bearing 2 .

[0032] Furthermore, M is the number of slots in the circumferential direction of the retaining frame, which is determined according to the number of magnetic steels in the circumferential direction of the actual permanent magnet water-lubricated bearing 2, and N is the number of magnetic metal sheets 4 placed in each slot in the axial direction of the retaining frame, which is determined according to the number of magnetic steels in the axial direction of the permanent magnet water-lubricated bearing 2.

[0033] Furthermore, the outer dimensions of the retaining frame match the dimensions of the bearing.

[0034] Furthermore, the outer dimensions of the magnetic conductive metal sheet 4 match the dimensions of the permanent magnetic water-lubricated bearing 2 and the retaining frame.

[0035] The specific working method of the present invention is as follows:

[0036] The present invention designs magnetically conductive metal sheets 4 of various shapes and sizes and places them within slots on the front and rear retainers 1 and 3, based on the actual magnetic steel shapes of the permanent magnetic water-lubricated bearing. The shape of the magnetic sheet 4 within each slot is determined by the radial and circumferential shapes of the corresponding magnetic steel at that location. The magnetic permeability is determined based on the requirements for magnetic force adjustment, and the thickness is determined based on the sensitivity to magnetic force adjustment. The specific adjustment method involves obtaining the actual magnetic force of each magnetic steel or the circumferential and axial distribution characteristics of the magnetic field of the permanent magnetic water-lubricated bearing 2, inputting the actual magnetic field results into a simulation, and through simulation debugging, determining the magnetic permeability range of the magnetic sheet 4 on the front and rear retainers 1 and 3 when the magnetic field of the permanent magnetic water-lubricated bearing 2 is uniform. Subsequently, magnetic metal sheets 4 with different magnetic permeabilities are placed at the corresponding positions of the front retainer 1 and the rear retainer 3 according to the simulation results (the magnetic permeability of the magnetic metal sheet 4 at the position where the magnetic force needs to be increased should be smaller than the magnetic permeability of the magnetic metal sheet 4 at the position where the magnetic force needs to be reduced). After all the magnetic metal sheets 4 are placed in the slots on the front retainer 1 and the rear retainer 3, the front retainer 1 is pushed into the permanent magnetic water-lubricated bearing 2 from the front end, and the rear retainer 3 is pushed into the permanent magnetic water-lubricated bearing 2 from the rear end, and fixed to the permanent magnetic water-lubricated bearing 2 through the flanges on the front retainer 1 and the rear retainer 3.

[0037] The present invention is not limited to this embodiment, and any equivalent concepts or modifications within the technical scope disclosed by the present invention are included in the protection scope of the present invention.

Claims

1. A magnetic force regulating device for a permanent magnetic water-lubricated bearing, characterized in that: It comprises a front retaining frame (1), a rear retaining frame (3) and a magnetic conductive metal sheet (4); The cross-section of the front retainer (1) is an arc shape, the front end of the front retainer (1) is a flange, the outer side surface of the front retainer (1) is uniformly distributed with M axial slots along the circumferential direction, and each slot is uniformly distributed with N magnetic conductive metal thin plates (4) along the axial direction; The structure and shape of the rear retainer (3) are the same as those of the front retainer (1), and the rear retainer (3) is symmetrical with the front retainer (1). The flange of the front retainer (1) is fixed to the front end of the permanent magnetic water-lubricated bearing (2); the flange of the rear retainer (3) is fixed to the rear end of the permanent magnetic water-lubricated bearing (2); the front retainer (1) and the rear retainer (3) are butted together inside the permanent magnetic water-lubricated bearing (2) to form a retainer; Each magnetic metal sheet (4) is made of metals with different magnetic permeabilities, and the magnetic permeabilities of the magnetic metal sheets (4) are determined by testing the actual magnetic force results of each magnetic steel; or after obtaining the magnetic force distribution at different positions of the permanent magnetic water-lubricated bearing (2) through test bench testing, the actual magnetic field results are input into the simulation software with the aid of simulation software, and the magnetic permeabilities of the magnetic metal sheets (4) at different positions on the retaining frame are determined through simulation.

2. The magnetic force regulating device for a permanent magnetic water-lubricated bearing according to claim 1, characterized in that: The arc angle of the retaining frame is determined according to the overall circumferential arc of the actual magnetic steel array, and the value range is 90° to 120°.

3. The magnetic force regulating device for a permanent magnetic water-lubricated bearing according to claim 1, characterized in that: The retaining frame is installed in the permanent magnetic water-lubricated bearing (2) and is symmetrical about the axial center cross section of the permanent magnetic water-lubricated bearing (2).

4. The magnetic force regulating device for a permanent magnetic water-lubricated bearing according to claim 1, characterized in that: The M is the number of slots in the circumferential direction of the retainer, which is determined according to the number of magnetic steels in the circumferential direction corresponding to the actual permanent magnetic water-lubricated bearing (2); and the N is the number of magnetic conductive metal sheets (4) placed in each slot in the axial direction of the retainer, which is determined according to the number of magnetic steels in the axial direction of the permanent magnetic water-lubricated bearing (2).

5. The magnetic force regulating device for a permanent magnetic water-lubricated bearing according to claim 1, characterized in that: The outer dimensions of the retaining frame match the dimensions of the bearing.

6. The magnetic force regulating device for a permanent magnetic water-lubricated bearing according to claim 1, characterized in that: The outer dimensions of the magnetic conductive metal sheet (4) match the dimensions of the permanent magnetic water-lubricated bearing (2) and the retaining frame.

Images