An embedded extruded magnetorheological damper

Abstract

The purpose of the present invention is to provide an embedded extruded magnetorheological damper, comprising a working cylinder, a piston rod, a piston body, a magnetorheological fluid, a permanent magnet positioning ring, a permanent magnet ring I, and a permanent magnet ring II; an annular convex portion is respectively provided on the left and right end faces of the piston body. The present invention can solve the problems of the existing small damping force, and at the same time, reduce the volume of the magnetorheological fluid used for working, greatly improve the magnetorheological damping force, and has the advantages of small amount of magnetorheological fluid required and significant magnetorheological effect.

Description

Technical Field

[0001] The invention belongs to the field of magnetorheological technology, and in particular relates to an embedded extruded magnetorheological damper. Background Art

[0002] Magnetorheological damper is a new type of damper that uses magnetorheological fluid, a controllable fluid. Under different magnetic fields, the shear yield strength of magnetorheological fluid is different, and the shear force that forces the magnetorheological fluid to flow is also different, which means that the damping force provided by the magnetorheological damper is variable. Therefore, by controlling the magnetic field generated by the external current, the purpose of adjusting the damping force of the magnetorheological damper can be achieved. It is precisely because of this important engineering application value of magnetorheological damper that the industry has now widely studied magnetorheological damper.

[0003] According to the flow mode of magnetorheological fluid, magnetorheological dampers can be divided into shear type, valve type, extrusion type and a mixed working mode of the two modes, among which the shear valve type magnetorheological damper is the most widely used. (Appendix: References CN201510346926, 201410425759.4), the patents in the references have the disadvantages of small damping force and low reliability, and the damping force needs to be further improved to meet the needs of actual working conditions.

[0004] Other prior art magnetorheological dampers also have various technical problems, such as low utilization rate of magnetorheological fluid, easy precipitation and clogging of magnetorheological fluid, fixed damping force adjustment range and inability to adjust flexibly, sometimes failure of the energized coil, and inability to ensure stable operation. Summary of the invention

[0005] The purpose of the present invention is to provide an embedded extruded magnetorheological damper, which can solve the existing problems such as small damping force, while reducing the volume of working magnetorheological fluid, greatly improving the magnetorheological damping force, and has the advantages of small amount of magnetorheological fluid required and significant magnetorheological effect.

[0006] The technical solution of the present invention is as follows:

[0007] The embedded extruded magnetorheological damper comprises a working cylinder, a piston rod, a piston body, a magnetorheological fluid, a permanent magnet positioning ring, a permanent magnet ring I, and a permanent magnet ring II;

[0008] An annular convex portion is respectively provided on the left and right end surfaces of the piston body, and a plurality of permanent magnet annular grooves I are arranged at intervals at other positions on the left and right end surfaces of the piston body; a permanent magnet ring I is arranged in the permanent magnet annular groove I, and the outer end surface of the permanent magnet ring I is flush with the left and right end surfaces of the piston body; a plurality of permanent magnet annular grooves II are respectively arranged at intervals on the end surfaces of the annular convex portions on the left and right end surfaces of the piston body, and a permanent magnet ring II is arranged in the permanent magnet annular groove II;

[0009] The two ends of the piston rod pass through the piston rod hole and pass through the left and right end surfaces of the working cylinder respectively, and can slide along the piston rod hole relative to the working cylinder; the piston body is arranged in the working cylinder, the piston body is fixedly connected to the middle part of the piston rod, and the axis of the piston body and the piston rod coincide;

[0010] The shapes of the left and right inner walls of the working cylinder correspond to the left and right end surface structural design of the piston body. The left and right inner walls of the working cylinder are separated by an annular groove corresponding to the annular convex portion, and the annular convex portion extends into the annular groove; the inner and outer circular surfaces and end surfaces of the annular convex portion respectively leave gaps with the upper and lower inner walls and bottom walls of the corresponding annular grooves, and the gaps are filled with magnetorheological fluid; the left and right end surfaces and outer circular surfaces of the piston body respectively leave gaps with the left and right inner walls and inner circular surfaces of the working cylinder, and the gaps are filled with magnetorheological fluid.

[0011] The annular protrusion is arranged on the inner side of the left and right end surfaces of the piston body, close to the piston rod, and the permanent magnet annular grooves I are all opened on the left and right end surfaces of the piston body outside the annular protrusion.

[0012] Each of the permanent magnet rings I and permanent magnet ring II is an axially magnetized permanent magnet, and the directions of the magnetic lines of force of each of the permanent magnet rings I and permanent magnet ring II are the same.

[0013] The working cylinder and the piston body are both made of magnetic conductive materials.

[0014] The gaps between the inner and outer circular surfaces and end surfaces of the annular protrusion and the upper and lower inner walls and bottom walls of the corresponding annular grooves are 0.5mm-20mm; the gaps between the left and right end surfaces and outer circular surfaces of the piston body and the left and right inner walls and inner circular surfaces of the working cylinder are 0.5mm-20mm.

[0015] The left and right end faces of the piston body are provided with 4-20 groups of permanent magnet ring grooves I and permanent magnet rings I; the end face of the annular protrusion is provided with 4-20 groups of permanent magnet ring grooves II and permanent magnet rings II.

[0016] A sealing ring groove I is arranged on the inner circumferential surface of the piston rod hole, and a sealing ring I is arranged in the sealing ring groove I.

[0017] The working cylinder comprises an end cover and a cylinder body, and a sealing ring II is provided at the connection between the end cover and the cylinder body.

[0018] The middle part of the piston rod is a threaded rod, which is threadedly connected to the piston body.

[0019] The present invention increases the length of the magnetorheological fluid damping channel by forming an embedded fit between the working cylinder and the annular convex portion and the annular groove of the piston body respectively; and axially magnetized permanent magnets are arranged on the end surface of the piston body and the annular convex portion through clearance fit to realize an embedded extruded magnetorheological damper.

[0020] The present invention reduces the volume of the working magnetorheological fluid, greatly improves the magnetorheological damping force, and has the advantages of less magnetorheological fluid usage and significant magnetorheological effect.

[0021] The present invention also has the advantage that the magnetorheological fluid in the damping channel is not easy to precipitate and clog, and is particularly suitable for low-frequency and low-amplitude occasions where the power supply cannot be reached or the power supply is inconvenient to replace.

[0022] The present invention overcomes the disadvantage of insufficient damping force of the existing magnetorheological damper, effectively improves the damping force under the same volume, can be applied to more occasions, solves the problem of easy precipitation of magnetorheological fluid, and improves the utilization rate of magnetorheological fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of the magnetorheological damper of the present invention;

[0024] The serial numbers and corresponding names in the figure are as follows:

[0025] 1-working cylinder, 2-piston rod, 3-piston body, 4-magnetorheological fluid, 5-threaded rod, 6-permanent magnet ring I, 7-permanent magnet ring II, 8-annular convex part, 9-annular groove, 10-sealing ring I, 11-end cover, 12-cylinder body, 13-sealing ring II. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] like Figure 1 As shown, the embedded extruded magnetorheological damper comprises a working cylinder 1, a piston rod 2, a piston body 3, a magnetorheological fluid 4, a permanent magnet positioning ring 5, a permanent magnet ring I6, and a permanent magnet ring II 7;

[0028] An annular convex portion 8 is respectively provided on the left and right end surfaces of the piston body 3, and a plurality of permanent magnet annular grooves I are arranged at intervals at other positions on the left and right end surfaces of the piston body 3; a permanent magnet ring I6 is arranged in the permanent magnet annular groove I, and the outer end surface of the permanent magnet ring I6 is flush with the left and right end surfaces of the piston body 3; a plurality of permanent magnet annular grooves II are respectively arranged at intervals on the end surfaces of the annular convex portion 8 on the left and right end surfaces of the piston body 3, and a permanent magnet ring II7 is arranged in the permanent magnet annular groove II;

[0029] The two ends of the piston rod 2 pass through the piston rod hole and pass through the left and right end surfaces of the working cylinder 1 respectively, and can slide along the piston rod hole relative to the working cylinder 1; the piston body 3 is arranged in the working cylinder 1, and the piston body 3 is fixedly connected to the middle part of the piston rod 2, and the axis of the piston body 3 and the piston rod 2 coincide;

[0030] The shape of the left and right inner walls of the working cylinder 1 corresponds to the left and right end surface structural design of the piston body 3. The left and right inner walls of the working cylinder 1 are separated by an annular groove 9 corresponding to the annular convex portion 8, and the annular convex portion 8 extends into the annular groove 9; the inner and outer circular surfaces and end surfaces of the annular convex portion 8 respectively leave gaps with the upper and lower inner walls and bottom walls of the corresponding annular groove 9, and the gaps are filled with magnetorheological fluid 4; the left and right end surfaces and outer circular surfaces of the piston body 3 respectively leave gaps with the left and right inner walls and inner circular surfaces of the working cylinder 1, and the gaps are filled with magnetorheological fluid 4.

[0031] The annular protrusion 8 is arranged on the inner side of the left and right end surfaces of the piston body 3, close to the piston rod 2, and the permanent magnet annular grooves I are all opened on the left and right end surfaces of the piston body 3 outside the annular protrusion 8.

[0032] The permanent magnet rings I6 and II7 are all axially magnetized permanent magnets, and the directions of the magnetic lines of force of the permanent magnet rings I6 and II7 are the same.

[0033] The working cylinder 1 and the piston body 3 are both made of magnetic conductive materials.

[0034] The gaps between the inner and outer circular surfaces and end surfaces of the annular protrusion 8 and the upper and lower inner walls and bottom walls of the corresponding annular groove 9 are 0.5mm-20mm; the gaps between the left and right end surfaces and outer circular surfaces of the piston body 3 and the left and right inner walls and inner circular surfaces of the working cylinder 1 are 0.5mm-20mm.

[0035] The left and right end faces of the piston body 3 are provided with 4-20 groups of permanent magnet ring grooves I and permanent magnet rings I6; the end face of the annular protrusion 8 is provided with 4-20 groups of permanent magnet ring grooves II and permanent magnet rings II7.

[0036] A sealing ring groove I is arranged on the inner circumferential surface of the piston rod hole, and a sealing ring I10 is arranged in the sealing ring groove I.

[0037] The working cylinder 1 comprises an end cover 11 and a cylinder body 12 , and a sealing ring II 13 is provided at the connection between the end cover 11 and the cylinder body 12 .

[0038] The middle portion of the piston rod 2 is a threaded rod 14 , which is threadedly connected to the piston body 3 via the threaded rod 14 .

Claims

1. An embedded extruded magnetorheological damper, comprising a working cylinder (1), a piston rod (2), a piston body (3), a magnetorheological fluid (4), a permanent magnet ring I (6), and a permanent magnet ring II (7), characterized in that: An annular convex portion (8) is respectively provided on the left and right end surfaces of the piston body (3), and a plurality of permanent magnet annular grooves I are arranged at intervals at other positions on the left and right end surfaces of the piston body (3); a permanent magnet ring I (6) is arranged in the permanent magnet annular groove I, and the outer end surface of the permanent magnet ring I (6) is flush with the left and right end surfaces of the piston body (3); a plurality of permanent magnet annular grooves II are respectively arranged at intervals on the end surfaces of the annular convex portion (8) on the left and right end surfaces of the piston body (3), and a permanent magnet ring II (7) is arranged in the permanent magnet annular groove II; The two ends of the piston rod (2) pass through the piston rod hole and pass through the left and right end surfaces of the working cylinder (1), respectively, and can slide along the piston rod hole relative to the working cylinder (1); the piston body (3) is arranged in the working cylinder (1), the piston body (3) is fixedly connected to the middle part of the piston rod (2), and the axis of the piston body (3) and the piston rod (2) coincide with each other; The left and right inner walls of the working cylinder (1) correspond to the left and right end surface structural design of the piston body (3); annular grooves (9) corresponding to the annular protrusions (8) are arranged at intervals on the left and right inner walls of the working cylinder (1); the annular protrusions (8) extend into the annular grooves (9); gaps are left between the inner and outer circular surfaces and the end surfaces of the annular protrusions (8) and the upper and lower inner walls and the bottom wall of the corresponding annular grooves (9); the gaps are filled with magnetorheological fluid (4); gaps are left between the left and right end surfaces and the outer circular surface of the piston body (3) and the left and right inner walls and the inner circular surface of the working cylinder (1); the gaps are filled with magnetorheological fluid (4); The annular protrusion (8) is arranged on the inner side of the left and right end surfaces of the piston body (3) and close to the piston rod (2); the permanent magnet annular grooves I are both arranged on the left and right end surfaces of the piston body (3) outside the annular protrusion (8); Each of the permanent magnet rings I (6) and permanent magnet rings II (7) is an axially magnetized permanent magnet, and the directions of the magnetic lines of force of each of the permanent magnet rings I (6) and permanent magnet rings II (7) are the same.

2. The embedded extruded magnetorheological damper according to claim 1, characterized in that: The working cylinder (1) and the piston body (3) are both made of magnetic conductive materials.

3. The embedded extruded magnetorheological damper according to claim 1, characterized in that: The gaps between the inner and outer circular surfaces and the end surfaces of the annular protrusion (8) and the upper and lower inner walls and the bottom wall of the corresponding annular groove (9) are 0.5 mm to 20 mm; the gaps between the left and right end surfaces and the outer circular surface of the piston body (3) and the left and right inner walls and the inner circular surface of the working cylinder (1) are 0.5 mm to 20 mm.

4. The embedded extruded magnetorheological damper according to claim 1, characterized in that: The left and right end surfaces of the piston body (3) are provided with 4 to 20 groups of permanent magnet ring grooves I and permanent magnet rings I (6); the end surface of the annular protrusion (8) is provided with 4 to 20 groups of permanent magnet ring grooves II and permanent magnet rings II (7).

5. The embedded extruded magnetorheological damper according to claim 1, characterized in that: A sealing ring groove I is provided on the inner circumferential surface of the piston rod hole, and a sealing ring I (10) is provided in the sealing ring groove I.

6. The embedded extruded magnetorheological damper according to claim 1, characterized in that: The working cylinder (1) comprises an end cover (11) and a cylinder body (12), and a sealing ring II (13) is provided at the connection between the end cover (11) and the cylinder body (12).

7. The embedded extruded magnetorheological damper according to claim 1, characterized in that: The middle portion of the piston rod (2) is a threaded rod (5), which is threadedly connected to the piston body (3) via the threaded rod (5).

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