A series extrusion magnetorheological damper

Abstract

The purpose of the present invention is to provide a series type extruded magnetorheological damper, comprising a working cylinder, a piston rod, a piston body of an electromagnetic piston, a magnetorheological fluid, a permanent magnet positioning ring, a permanent magnet ring, and a coil; the left and right end surfaces of the piston body are provided with a plurality of annular grooves spaced in a radial direction. The present invention can solve the existing problems such as small damping force, and at the same time achieves the reduction of the volume of magnetorheological fluid used for work, greatly improves 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 a series extrusion 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 a series-type 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 series extrusion magnetorheological damper comprises a working cylinder, a piston rod, a piston body, a magnetorheological fluid, a permanent magnet positioning ring, a permanent magnet ring, and a coil;

[0008] The left and right end surfaces of the piston body are provided with a plurality of annular grooves spaced in a radial direction; the two ends of the piston rod respectively pass through the left and right end surfaces of the working cylinder through the piston rod hole, and can slide relative to the working cylinder along the piston rod hole; 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;

[0009] 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. The left and right inner walls of the working cylinder 1 are provided with annular protrusions 11 corresponding to the annular grooves 10 one by one. The annular protrusions 11 extend into the corresponding annular grooves 10. There are gaps between the end faces and inner and outer circular surfaces of each annular protrusion 11 and the bottom wall and upper and lower inner walls of the corresponding annular grooves 10.

[0010] There is a gap between the left and right end surfaces of the piston body 3 and the left and right inner walls of the working cylinder 1;

[0011] A coil ring groove is provided on the outer circumferential surface of the piston body 3, and a coil 7 is provided in the coil ring groove; a permanent magnet positioning ring 5 is provided on the inner circumferential surface of the working cylinder 1, and the left and right end surfaces of the permanent magnet positioning ring 5 are in contact with the left and right inner walls of the working cylinder 1; a permanent magnet ring groove is provided on the permanent magnet positioning ring 5, and the permanent magnet ring 6 is arranged in the permanent magnet ring groove, and the inner circumferential surface of the permanent magnet ring 6 is flush with or lower than the inner circumferential surface of the permanent magnet positioning ring 5; the outer circumferential surface of the piston body 3 corresponds to the inner circumferential surface of the permanent magnet positioning ring 5, and a gap is left between them, and a gap is left between the outer circumferential surface of the coil 7 and the inner circumferential surface of the permanent magnet positioning ring 5; the magnetorheological fluid 4 is filled in each gap.

[0012] The inner circumferential surface of the permanent magnet positioning ring is provided with a plurality of groups of permanent magnet ring grooves and permanent magnet rings.

[0013] Each group of permanent magnet ring grooves and permanent magnet rings are distributed at equal intervals.

[0014] Each permanent magnet ring is an axially magnetized permanent magnet, and the directions of the magnetic lines of force of each permanent magnet ring are the same.

[0015] The gap size between the end faces and inner and outer circular surfaces of each annular protrusion and the bottom wall and upper and lower inner walls of the corresponding annular groove is 0.5mm-20mm; the gap size between the left and right end faces of the piston body and the left and right inner walls of the working cylinder is 0.5mm-20mm; the gap size between the outer circular surface of the piston body and the inner circular surface of the permanent magnet positioning ring is 0.3mm-30mm.

[0016] A wire guide groove is arranged in the piston rod, and electric wires are arranged in the wire guide groove to respectively connect the coil on the piston body and the external power supply.

[0017] 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.

[0018] 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.

[0019] Both ends of the piston rod are provided with lifting rings for installation.

[0020] The middle part of the piston rod is a threaded rod, which is threadedly connected to the piston body.

[0021] The working cylinder and the piston body are both made of magnetic conductive materials.

[0022] A piston rod mounting convex ring is arranged at the middle of the left and right inner walls of the working cylinder, and the piston rod hole is arranged on the piston rod mounting convex ring.

[0023] The present invention increases the length of the magnetorheological fluid damping channel by respectively embedding the working cylinder with the piston body, reduces the volume of the working magnetorheological fluid, greatly improves the magnetorheological damping force, and has the advantages of requiring a small amount of magnetorheological fluid and a significant magnetorheological effect.

[0024] The present invention also has the advantage that the magnetorheological fluid in the damping channel is not easy to precipitate and clog. The present invention overcomes the problem of insufficient damping force of the magnetorheological shock absorber and the inability to flexibly adjust the damping force, effectively improves the damping force under the same volume, avoids the unstable operation caused by the failure of the coil power supply, solves the problem of easy precipitation of the magnetorheological fluid, and improves the utilization rate of the magnetorheological fluid.

[0025] The present invention also adopts the method of connecting permanent magnets in series so that the present invention also has a safety protection function in the event of power-on failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of the magnetorheological damper of the present invention;

[0027] The serial numbers and corresponding names in the figure are as follows:

[0028] 1-working cylinder, 2-piston rod, 3-piston body, 4-magnetorheological fluid, 5-permanent magnet positioning ring, 6-permanent magnet ring, 7-coil, 8-lead groove, 9-sealing ring I, 10-annular groove, 11-annular convex part, 12-sealing ring II, 13-threaded rod, 14-end cover, 15-cylinder body, 16-piston rod mounting convex ring. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] like Figure 1 As shown, the series extrusion 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 6, and a coil 7;

[0031] The left and right end surfaces of the piston body 3 are provided with a plurality of annular grooves 10 at intervals in the radial direction; the two ends of the piston rod 2 respectively pass through the left and right end surfaces of the working cylinder 1 through the piston rod hole, and can slide relative to the working cylinder 1 along the piston rod hole; 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;

[0032] 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. The left and right inner walls of the working cylinder 1 are provided with annular protrusions 11 corresponding to the annular grooves 10 one by one. The annular protrusions 11 extend into the corresponding annular grooves 10. There are gaps between the end faces and inner and outer circular surfaces of each annular protrusion 11 and the bottom wall and upper and lower inner walls of the corresponding annular grooves 10.

[0033] There is a gap between the left and right end surfaces of the piston body 3 and the left and right inner walls of the working cylinder 1;

[0034] A coil ring groove is provided on the outer circumferential surface of the piston body 3, and a coil 7 is provided in the coil ring groove; a permanent magnet positioning ring 5 is provided on the inner circumferential surface of the working cylinder 1, and the left and right end surfaces of the permanent magnet positioning ring 5 are in contact with the left and right inner walls of the working cylinder 1; a permanent magnet ring groove is provided on the permanent magnet positioning ring 5, and the permanent magnet ring 6 is arranged in the permanent magnet ring groove, and the inner circumferential surface of the permanent magnet ring 6 is flush with or lower than the inner circumferential surface of the permanent magnet positioning ring 5; the outer circumferential surface of the piston body 3 corresponds to the inner circumferential surface of the permanent magnet positioning ring 5, and a gap is left between them, and a gap is left between the outer circumferential surface of the coil 7 and the inner circumferential surface of the permanent magnet positioning ring 5; the magnetorheological fluid 4 is filled in each gap.

[0035] The inner circumferential surface of the permanent magnet positioning ring 5 is provided with a plurality of groups of permanent magnet ring grooves and permanent magnet rings 6 .

[0036] Each group of permanent magnet ring grooves and the permanent magnet ring 6 are distributed at equal intervals.

[0037] Each permanent magnet ring 6 is an axially magnetized permanent magnet, and the directions of the magnetic lines of force of each permanent magnet ring 6 are the same.

[0038] The gap size between the end faces and inner and outer circular surfaces of each annular protrusion 11 and the bottom wall and upper and lower inner walls of the corresponding annular groove 10 is 0.5mm-20mm; the gap size between the left and right end faces of the piston body 3 and the left and right inner walls of the working cylinder 1 is 0.5mm-20mm; the gap size between the outer circular surface of the piston body 3 and the inner circular surface of the permanent magnet positioning ring 5 is 0.3mm-30mm.

[0039] A wire guide groove 8 is provided in the piston rod 2, and wires are provided in the wire guide groove 8 to connect the coil 7 on the piston body 3 and an external power source respectively.

[0040] A sealing ring groove I is arranged on the inner circumferential surface of the piston rod hole, and a sealing ring I9 is ​​arranged in the sealing ring groove I.

[0041] The working cylinder 1 comprises an end cover 14 and a cylinder body 15 , and a sealing ring II 12 is provided at the connection between the end cover 14 and the cylinder body 15 .

[0042] The middle portion of the piston rod 2 is a threaded rod 13 , which is threadedly connected to the piston body 3 .

[0043] The working cylinder 1 and the piston body 3 are both made of magnetic conductive materials.

[0044] A piston rod mounting convex ring 16 is provided in the middle of the left and right inner walls of the working cylinder 1 , and the piston rod hole is provided on the piston rod mounting convex ring 16 .

Claims

1. A series extrusion magnetorheological damper, comprising 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 (6), and a coil (7), characterized in that: The left and right end surfaces of the piston body (3) are provided with a plurality of annular grooves (10) at intervals in the radial direction; the two ends of the piston rod (2) respectively pass through the left and right end surfaces of the working cylinder (1) through the piston rod hole, 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; The shapes of 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 protrusions (11) corresponding to the annular grooves (10) are arranged on the left and right inner walls of the working cylinder (1) at intervals, and the annular protrusions (11) extend into the corresponding annular grooves (10); gaps are left between the end faces and inner and outer circular surfaces of each annular protrusion (11) and the bottom wall and upper and lower inner walls of the corresponding annular groove (10); A gap is left between the left and right end surfaces of the piston body (3) and the left and right inner walls of the working cylinder (1); The outer circumferential surface of the piston body (3) is provided with a coil ring groove, and a coil (7) is arranged in the coil ring groove; the inner circumferential surface of the working cylinder (1) is provided with a permanent magnet positioning ring (5), and the left and right end surfaces of the permanent magnet positioning ring (5) are in contact with the left and right inner walls of the working cylinder (1); the permanent magnet positioning ring (5) is provided with a permanent magnet ring groove, and the permanent magnet ring (6) is arranged in the permanent magnet ring groove, and the inner circumferential surface of the permanent magnet ring (6) is flush with or lower than the inner circumferential surface of the permanent magnet positioning ring (5); the outer circumferential surface of the piston body (3) corresponds to the inner circumferential surface of the permanent magnet positioning ring (5), and a gap is left therebetween, and a gap is left between the outer circumferential surface of the coil (7) and the inner circumferential surface of the permanent magnet positioning ring (5); the magnetorheological fluid (4) is filled in each gap; A sealing ring groove I is provided on the inner circumferential surface of the piston rod hole, and a sealing ring I (9) is provided in the sealing ring groove I.

2. The serial extruded magnetorheological damper according to claim 1, characterized in that: The inner circumferential surface of the permanent magnet positioning ring (5) is provided with a plurality of groups of permanent magnet ring grooves and permanent magnet rings (6); each group of permanent magnet ring grooves and permanent magnet rings (6) are distributed at equal intervals.

3. The serial extruded magnetorheological damper according to claim 2, characterized in that: Each permanent magnet ring (6) is an axially magnetized permanent magnet, and the directions of the magnetic lines of force of each permanent magnet ring (6) are the same.

4. The serial extruded magnetorheological damper according to claim 1, characterized in that: The gap size between the end face and inner and outer circular surfaces of each annular protrusion (11) and the bottom wall and upper and lower inner walls of the corresponding annular groove (10) is 0.5mm-20mm; the gap size between the left and right end faces of the piston body (3) and the left and right inner walls of the working cylinder (1) is 0.5mm-20mm; the gap size between the outer circular surface of the piston body (3) and the inner circular surface of the permanent magnet positioning ring (5) is 0.3mm-30mm.

5. The serial extruded magnetorheological damper according to claim 1, characterized in that: A wire guide groove (8) is provided in the piston rod (2), and wires are provided in the wire guide groove (8) to respectively connect the coil (7) on the piston body (3) and an external power source.

6. The serial extruded magnetorheological damper according to claim 1, characterized in that: The working cylinder (1) comprises an end cover (14) and a cylinder body (15), and a sealing ring II (12) is provided at the connection between the end cover (14) and the cylinder body (15).

7. The serial extruded magnetorheological damper according to claim 1, characterized in that: The middle portion of the piston rod (2) is a threaded rod (13), which is threadedly connected to the piston body (3) via the threaded rod (13).

8. The serial 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 material.

9. The serial extruded magnetorheological damper according to claim 1, characterized in that: A piston rod mounting convex ring (16) is provided in the middle of the left and right inner walls of the working cylinder (1), and the piston rod hole is provided on the piston rod mounting convex ring (16).

Images