Magnetorheological damper capable of effectively improving damping force

Abstract

The utility model discloses a magnetorheological damper capable of effectively improving damping force, and particularly relates to the technical field of magnetorheological dampers, which comprises an outer cylinder, an inner cylinder, an upper end cover, a lower end cover, a damping gap and a piston rod. According to the magneto-rheological damper capable of effectively improving the damping force, the permanent magnet ring is arranged outside the inner cylinder, the magnet exciting coil is arranged outside the permanent magnet ring, and when the magneto-rheological damper works, the permanent magnet ring can effectively enhance a magnetic field generated when current passes through the magnet exciting coil, so that the damping force of magneto-rheological fluid in a working state can be improved, and the damping force of the magneto-rheological fluid is improved. According to the magnetorheological damper, the maximum damping force is larger than that of a traditional magnetorheological damper, the damping force of the damper is large in adjustable amplitude, meanwhile, the maximum value of the damping force is increased, meanwhile, the magnetorheological damper is simple in structure, the outer cylinder and the inner cylinder are detachably connected, later maintenance and replacement of parts and magnetorheological fluid are facilitated, and the magnetorheological damper is suitable for large-scale popularization and application. Repeated utilization is achieved, resources and cost are saved, and assembling of the magnetorheological damper is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetorheological dampers, in particular to a magnetorheological damper which can effectively improve the damping force. Background Art

[0002] Magnetorheological fluid is a new type of intelligent material, mainly composed of non-magnetic liquid and tiny magnetic particles with high magnetic permeability and low magnetic hysteresis evenly dispersed therein. In order to ensure the suspension stability of magnetorheological fluid, it usually also includes an appropriate amount of additives. Under the action of a magnetic field, it can change from a Newtonian fluid with good flow properties to a Bingham semi-solid in an instant, and this change is continuous, controllable and reversible.

[0003] The traditional magnetorheological damper has only one excitation coil, and the performance of the magnetorheological damper depends largely on the excitation coil that generates the magnetic field. However, when the magnetorheological damper is working, the magnetic field when the excitation coil passes current is relatively weak, and the controllable damping effect of the magnetorheological fluid needs to be improved. Utility Model Content

[0004] The main purpose of the utility model is to provide a magnetorheological damper which can effectively improve the damping force and can effectively solve the problems in the background technology.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A magnetorheological damper capable of effectively improving damping force comprises an outer cylinder, an inner cylinder, an upper end cover, a lower end cover, a damping gap, a piston rod, a piston and a magnetorheological fluid, wherein the outer cylinder is concentrically and spaced apart from the periphery of the inner cylinder, and the outer cylinder and the inner cylinder are installed between the upper end cover and the lower end cover, a movable lifting ear is fixedly installed at one end of the piston rod, the other end of the piston rod passes through the upper end cover and is fixedly connected to the piston, the piston is slidably connected to the inner wall of the inner cylinder, a fixed lifting ear is fixedly installed at the bottom of the lower end cover, a damping gap for the flow of magnetorheological fluid is arranged between the outer cylinder and the inner cylinder, a radial second flow hole is opened at the inner wall of the inner cylinder near the upper end cover, and a radial second flow hole is opened at the inner wall of the inner cylinder near the lower end cover. The first flow hole of the inner cylinder is provided with two axially distributed annular grooves along its circumference, a permanent magnet ring is installed in the annular groove, the inner wall of the permanent magnet ring is in close contact with the circumferential wall of the annular groove, and the magnetic poles of two adjacent permanent magnet rings are placed in opposite directions, an annular insulating layer is provided on the outer surface of the permanent magnet ring, an excitation coil is wound around the annular insulating layer, a sealing insulating layer is provided on the periphery of the excitation coil, a buffer rod is fixedly installed on the middle part of the top wall of the lower end cover, a buffer cavity is opened inside the piston rod, the top of the buffer rod passes through the piston and the piston rod, extends into the buffer cavity and is fixedly installed with a buffer block, a buffer spring is fixedly installed on the top of the buffer block, and the buffer block slides in the buffer cavity.

[0007] Preferably, the outer cylinder, the inner cylinder, the upper end cover and the lower end cover are fixedly connected by screws.

[0008] Preferably, a first dynamic sealing ring is provided between the upper end cover and the piston rod, a second dynamic sealing ring is provided between the piston and the buffer rod, and a third dynamic sealing ring and a guide ring are provided between the piston and the inner wall of the inner cylinder.

[0009] Preferably, the outer cylinder is provided with a through hole, and the lead wire of the excitation coil is led out to the outside of the outer cylinder through the through hole.

[0010] Preferably, a sealing gasket is provided between the outer cylinder and the upper end cover and the lower end cover.

[0011] Preferably, the upper end cover and the lower end cover are provided with bosses corresponding to the size of the inner cylinder.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The utility model discloses a magnetorheological damper capable of effectively improving the damping force. A permanent magnetic ring is arranged on the outside of an inner cylinder, and an excitation coil is arranged outside the permanent magnetic ring. When working, the permanent magnetic ring can effectively enhance the magnetic field when the excitation coil passes current, thereby improving the damping force of the magnetorheological fluid in the working state, so that the maximum damping force is greater than that of the traditional magnetorheological damper. The damping force of the damper described in the utility model has a large adjustable amplitude and improves the maximum value of the damping force. At the same time, the magnetorheological damper has a simple structure, and the outer cylinder and the inner cylinder are detachably connected, which is convenient for later maintenance and replacement of parts and magnetorheological fluid, realizes reuse, saves resources and costs, and simplifies the assembly of the magnetorheological damper. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model from a first perspective;

[0015] Figure 2 A structural diagram of the second viewing angle of the utility model

[0016] Figure 3 It is a cutaway view of the utility model;

[0017] Figure 4 For the utility model Figure 3 Sectional view at AA in the middle;

[0018] Figure 5 For the utility model Figure 3 Sectional view at the middle BB;

[0019] Figure 6 For the utility model Figure 3 Cross-sectional view at CC.

[0020] In the figure: 1. outer cylinder; 2. inner cylinder; 3. upper end cover; 4. lower end cover; 5. damping gap; 6. piston rod; 7. piston; 8. fixed lifting ear; 9. movable lifting ear; 10. buffer rod; 11. permanent magnet ring; 12. annular insulating layer; 13. excitation coil; 14. sealing insulating layer; 15. buffer block; 16. buffer spring; 17. screw; 18. sealing gasket; 19. first dynamic sealing ring; 20. second dynamic sealing ring; 21. third dynamic sealing ring; 22. magnetorheological fluid; 201. annular groove; 61. buffer cavity; 202. first flow hole; 203. second flow hole. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0022] like Figure 1-6As shown, a magnetorheological damper that can effectively improve the damping force includes an outer cylinder 1, an inner cylinder 2, an upper end cover 3, a lower end cover 4, a damping gap 5, a piston rod 6, a piston 7 and a magnetorheological fluid 22. The outer cylinder 1 is concentric and spaced with the outer periphery of the inner cylinder 2, and the outer cylinder 1 and the inner cylinder 2 are installed between the upper end cover 3 and the lower end cover 4. One end of the piston rod 6 is fixedly installed with a movable lifting ear 9, and the other end of the piston rod 6 passes through the upper end cover 3 and is fixedly connected to the piston 7. The piston 7 is slidably connected to the inner wall of the inner cylinder 2, and the lower end cover A fixing ear 8 is fixedly installed at the bottom of the outer cylinder 1, a damping gap 5 for the flow of magnetorheological fluid 22 is arranged between the outer cylinder 1 and the inner cylinder 2, a radial second flow hole 203 is opened at the inner wall of the inner cylinder 2 near the upper end cover 3, a radial first flow hole 202 is opened at the inner wall of the inner cylinder 2 near the lower end cover 4, and two axially distributed annular grooves 201 are arranged on the outer wall of the inner cylinder 2 along its circumference, a permanent magnet ring 11 is installed in the annular groove 201, and the inner wall of the permanent magnet ring 11 and the circumference of the annular groove 201 are connected. The peripheral wall is tightly attached, and the magnetic poles of two adjacent permanent magnet rings 11 are placed in opposite directions. The outer surface of the permanent magnet ring 11 is provided with an annular insulating layer 12, and an excitation coil 13 is wound around the annular insulating layer 12. The excitation coil 13 is provided with a sealed insulating layer 14 on the periphery. The magnetic field effect is enhanced by the effective cooperation between the permanent magnet ring 11 and the excitation coil 13. The excitation coil 13 fully covers the damping gap 5, so that the viscosity of the magnetorheological fluid 22 in the damping gap 5 becomes higher, the damping is increased, and the damping force is effectively improved. The middle part of the top wall of the lower end cover 4 is fixed A buffer rod 10 is fixedly installed, and a buffer cavity 61 is opened inside the piston rod 6. The top of the buffer rod 10 passes through the piston 7 and the piston rod 6, extends into the buffer cavity 61 and is fixedly installed with a buffer block 15. A buffer spring 16 is fixedly installed on the top of the buffer block 15. The buffer block 15 slides in the buffer cavity 61. When the piston rod 6 drives the piston 7 to move, the buffer spring 16 is squeezed. The elastic force of the buffer spring 16 is used to achieve a buffering effect, which can effectively prevent the damage of the damper caused by the instantaneous impact of external force.

[0023] The outer cylinder 1, the inner cylinder 2, the upper end cover 3 and the lower end cover 4 are fixedly connected by screws 17. The upper end cover 3 and the lower end cover 4 are provided with bosses corresponding to the size of the inner cylinder. The outer cylinder 1 and the inner cylinder 2 are detachable, which is convenient for later maintenance and replacement of parts and magnetorheological fluid 22, and reuse is achieved, which saves resources and costs, simplifies the assembly of the magnetorheological damper, and a sealing gasket 18 is provided between the outer cylinder 1 and the upper end cover 3 and the lower end cover 4, thereby improving the sealing of the damper.

[0024] A first dynamic seal ring 19 is provided between the upper end cover 3 and the piston rod 6, a second dynamic seal ring 20 is provided between the piston 7 and the buffer rod 10, and a third dynamic seal ring 21 and a guide ring are provided between the piston 7 and the inner wall of the inner tube 2, thereby improving the overall sealing performance.

[0025] The outer cylinder 1 is provided with a through hole, and the lead wire of the excitation coil 13 is led out to the outside of the outer cylinder 1 through the through hole, and a sealant is provided in the through hole.

[0026] The working principle of the utility model is as follows: when working, the piston rod 6 drives the piston 7 to move relative to the inner cylinder 2, the magnetorheological fluid 22 is squeezed into the damping gap 5 through the first flow hole 202, the excitation coil 13 is energized to generate a magnetic field around it, so that the magnetorheological fluid 22 produces visco-plastic flow and generates a damping force, thereby preventing the movement of the piston rod 6. At the same time, the magnetic field of the permanent magnet ring 11 is superimposed with the excitation coil 13 and the magnetic field, which effectively increases the damping force, so that the maximum damping force is greater than that of the traditional magnetorheological damper. The damping force of the damper described in the utility model has a large adjustable range and increases the maximum value of the damping force.

[0027] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A magnetorheological damper capable of effectively improving damping force, comprising an outer cylinder (1), an inner cylinder (2), an upper end cover (3), a lower end cover (4), a damping gap (5), a piston rod (6), a piston (7) and a magnetorheological fluid (22), wherein the outer cylinder (1) is concentrically and spaced apart from the outer periphery of the inner cylinder (2), and the outer cylinder (1) and the inner cylinder (2) are installed between the upper end cover (3) and the lower end cover (4), one end of the piston rod (6) is fixedly installed with a movable lifting ear (9), and the other end of the piston rod (6) passes through the upper end cover ( 3) and is fixedly connected to the piston (7), the piston (7) is slidably connected to the inner wall of the inner cylinder (2), a fixed lifting ear (8) is fixedly installed at the bottom of the lower end cover (4), a damping gap (5) for the flow of magnetorheological fluid (22) is provided between the outer cylinder (1) and the inner cylinder (2), a radial second flow hole (203) is provided on the inner wall of the inner cylinder (2) near the upper end cover (3), and a radial first flow hole (202) is provided on the inner wall of the inner cylinder (2) near the lower end cover (4), characterized in that: The outer wall of the inner cylinder (2) is provided with two axially distributed annular grooves (201) along its circumference, a permanent magnet ring (11) is installed in the annular groove (201), the inner wall of the permanent magnet ring (11) is in close contact with the circumferential wall of the annular groove (201), and the magnetic poles of two adjacent permanent magnet rings (11) are placed in opposite directions, an annular insulating layer (12) is provided on the outer surface of the permanent magnet ring (11), an excitation coil (13) is wound around the annular insulating layer (12), and the excitation coil (13) is wound around the annular insulating layer (12). 13) is provided with a sealing insulating layer (14) on the periphery, a buffer rod (10) is fixedly installed in the middle of the top wall of the lower end cover (4), a buffer cavity (61) is opened inside the piston rod (6), the top of the buffer rod (10) passes through the piston (7) and the piston rod (6) and extends into the buffer cavity (61) and is fixedly installed with a buffer block (15), a buffer spring (16) is fixedly installed on the top of the buffer block (15), and the buffer block (15) slides in the buffer cavity (61).

2. A magnetorheological damper capable of effectively improving damping force according to claim 1, characterized in that: The outer cylinder (1), the inner cylinder (2), the upper end cover (3) and the lower end cover (4) are fixedly connected by screws (17).

3. A magnetorheological damper capable of effectively improving damping force according to claim 1, characterized in that: A first dynamic seal ring (19) is arranged between the upper end cover (3) and the piston rod (6), a second dynamic seal ring (20) is arranged between the piston (7) and the buffer rod (10), and a third dynamic seal ring (21) and a guide ring are arranged between the piston (7) and the inner wall of the inner cylinder (2).

4. A magnetorheological damper capable of effectively improving damping force according to claim 1, characterized in that: The outer cylinder (1) is provided with a through hole, and the lead wire of the excitation coil (13) is led out to the outside of the outer cylinder (1) through the through hole.

5. The magnetorheological damper capable of effectively improving damping force according to claim 1, characterized in that: A sealing gasket (18) is provided between the outer cylinder (1) and the upper end cover (3) and the lower end cover (4).

6. A magnetorheological damper capable of effectively improving damping force according to claim 1, characterized in that: The upper end cover (3) and the lower end cover (4) are provided with bosses corresponding to the size of the inner cylinder.

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