Magnetic force adjusting device for permanent magnet water lubricated bearing

Abstract

The invention discloses a magnetic force adjusting device for a permanent magnet water lubricated bearing. The magnetic force adjusting device comprises a front retainer, a rear retainer and a magnetic conductive metal sheet, the cross section of the front retainer is in an arc shape, a flange is arranged at the front end of the front retainer, M axial clamping grooves are evenly distributed in the outer side face of the front retainer in the annular direction, and N magnetic conductive metal sheets are evenly distributed in each clamping groove in the axial direction. The structure and the shape of the rear retainer are the same as those of the front retainer, and the rear retainer and the front retainer are symmetrical front and back; and each magnetic conductive metal sheet is respectively made of metals with different magnetic conductivities. The front retainer, the rear retainer and the magnetic conductive metal sheet are designed in the permanent magnet water-lubricated bearing structure, so that the magnetic force and the uniformity of the permanent magnet water-lubricated bearing can be adjusted. According to the invention, the magnetic conductive metal sheet is designed according to the actual bearing magnetic steel boundary dimension, so that the bearing magnetic force deviation caused by the residual magnetism deviation of each piece of magnetic steel can be adjusted one by one.

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 usually use water-lubricated rubber bearings. However, due to the low viscosity of water and limited load-bearing capacity, it is easy to cause the water film to rupture under low-speed and heavy-load environments, aggravating the wear of the bearing shells and affecting the life of the bearings. In recent years, a new type of bearing, permanent magnetic water-lubricated bearings, has emerged. Its basic configuration idea is to use magnetic force to replace part of the bearing fluid load, which increases the load limit of the stern bearing and is more suitable for heavy-load environments.

[0003] However, when permanent magnetic water-lubricated bearings are manufactured, the magnetic force is provided by a magnetic steel array composed of multiple arc-shaped magnetic steels. After the magnetic steel grade is selected, the actual residual magnetism of each magnetic steel is within the residual magnetism range specified in GB / T 13560-2017. However, the magnetic steel of permanent magnetic water-lubricated bearings is large in size, and the residual magnetism difference between individual magnetic steels leads to problems such as uneven magnetic field of the magnetic steel array formed by them, and large differences in magnetic force from the design value, which affects the running stability of the bearing. 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 magnetic steel manufacturing errors. Furthermore, it can realize the adjustment of the magnetic force bearing capacity of the permanent magnet water-lubricated bearings.

[0005] To achieve the above object, the technical solution of the present invention is as follows: a magnetic force adjustment device for a permanent magnetic water-lubricated bearing, comprising a front cage, a rear cage 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 evenly distributed with M axial grooves along the circumferential direction, and each groove is evenly distributed with N magnetic conductive metal thin plates along the axial direction;

[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 butt-jointed 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] Further, 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 on the circumferential direction of the retainer, which is determined according to the number of magnetic steels on the circumferential direction of the actual bearing, and N is the number of magnetic metal sheets placed in each slot on the axial direction of the retainer, which is determined according to the number of magnetic steels on 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 piece one by one by designing the magnetic conductive metal sheet according to the actual outer dimensions of the bearing magnetic steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram (exploded diagram) 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 force regulating device of the present invention.

[0020] Figure 3 It is a detailed schematic diagram of the front retainer in the present invention.

[0021] Figure 4 It is a detailed schematic diagram of the rear retainer in the present invention.

[0022] Figure 5 It is a 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 evenly distributed with M axial grooves along the circumferential direction, and each groove is evenly distributed with N magnetic conductive metal sheets 4 along the axial direction;

[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 butt-jointed 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, and the magnetic permeability of the magnetic metal sheet 4 is determined by testing the actual magnetic force results of each magnetic steel; or after the magnetic force distribution at different positions of the permanent magnetic water-lubricated bearing 2 is obtained 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 on the circumferential direction of the retaining frame, which is determined according to the number of magnetic steels on 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 on the axial direction of the retaining frame, which is determined according to the number of magnetic steels on 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 magnetic metal sheets 4 of different shapes and sizes, and places them in the slots on the front retainer 1 and the rear retainer 3 according to the actual shape of the permanent magnetic water-lubricated bearing magnet steel. The shape of the magnetic metal sheet 4 in each slot is determined according to the radial and circumferential magnetic steel shapes corresponding to this position, the magnetic permeability is determined according to the requirements for magnetic force adjustment, and the thickness is determined according to the sensitivity to magnetic force adjustment. The specific adjustment method is: after obtaining the actual magnetic force size of each magnetic steel or the circumferential and axial distribution characteristics of the magnetic field of the permanent magnetic water-lubricated bearing 2, the actual magnetic field results are input into the simulation, and through simulation debugging, the magnetic permeability range of the magnetic metal sheet 4 on the front retainer 1 and the rear retainer 3 when the magnetic field of the permanent magnetic water-lubricated bearing 2 is uniform is obtained. 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 changes 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 in the shape of an arc, 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 grooves in the circumferential direction, and each groove is uniformly distributed with N magnetic conductive metal thin plates (4) in the axial direction; The structure and shape of the rear retaining frame (3) are the same as those of the front retaining frame (1), and the rear retaining frame (3) is symmetrical with the front retaining frame (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 butt-jointed 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 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 of different positions of the permanent magnetic water-lubricated bearing (2) through a test bench test, 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 sheet (4) at different positions on the retaining frame is determined through simulation.

2. A 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. A 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: 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 corresponding to the actual permanent magnetic water-lubricated bearing (2); N is the number of magnetic conductive 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 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.

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