A magnetorheological damper to prevent iron powder precipitation

Abstract

A magnetorheological damper for preventing iron powder precipitation includes a vertically arranged hydraulic cylinder filled with magnetorheological oil. A magnetorheological valve body is located at the upper end of the cylinder's interior, slidably connected to the cylinder's inner wall. A vertically arranged damping rod is fixed to the top of the valve body. A guide is fixed to the upper end of the cylinder, with the damping rod extending upwards from the guide and slidably connected to it. A vertically arranged energy storage tank is located on the left side of the cylinder, its bottom connected to the bottom of the cylinder. An oil-gas separator is located inside the energy storage tank, and the upper part of the tank is filled with nitrogen. This invention has a simple structure and is easy to use.

Description

Technical Field

[0001] This utility model belongs to the field of shock absorber technology, and in particular relates to a magnetorheological shock absorber that prevents iron powder precipitation. Background Technology

[0002] Magnetorheological dampers are a new type of intelligent damper that can control the output damping force by controlling the magnitude of the current, thus achieving a semi-active control effect. Therefore, they have been widely used in the automotive field. Compared with general dampers, magnetorheological dampers have faster response speed, continuously adjustable damping force, simpler structure, and better control effect. For example, the utility model patent entitled "Magnetorheological Damper" (authorization announcement number: CN202144849U) discloses features including a cylinder and piston with sliding fit, an excitation coil, and a power supply. The excitation coil is located inside the piston and connected to the power supply via a wire. However, in the prior art, iron powder in the magnetorheological fluid is prone to precipitation during use, leading to a decrease in the iron powder concentration in the magnetorheological fluid, accelerating the flow speed of the magnetorheological fluid, and affecting the damper's performance. Therefore, the iron powder in the magnetorheological fluid is prone to precipitation in the prior art, thus affecting the damping effect of the damper. Utility Model Content

[0003] This invention addresses the technical problem of iron powder easily settling in the magnetorheological fluid of magnetorheological dampers. It provides a magnetorheological damper that prevents iron powder settling, comprising a vertically arranged hydraulic cylinder with a piston inside, the piston being slidably connected to the inner wall of the cylinder. Magnetorheological fluid is injected into the cylinder, and a magnetorheological valve body is located inside the piston, connected to a power source. A vertically arranged damping rod is fixed to the top of the piston, and a guide is fixed to the upper end of the cylinder. The damping rod extends upward from the guide, and the damping rod is slidably connected to the guide. The damping rod is hollow inside and contains a wire harness. The bottom end of the wire harness is electrically connected to the magnetorheological valve body. (The magnetorheological valve body is a type of...) Hydraulic control components that use magnetorheological fluid as the working medium operate based on the rheological effect generated between a magnetic field and the magnetorheological fluid. When the magnetorheological valve body is working, the magnetorheological fluid (magnetorheological oil in this application) transforms from a free-flowing Newtonian fluid into a viscoplastic body with a certain shear yield strength and approximate solid properties under the action of a magnetic field. This transformation is continuous, controllable, and reversible. This transformation causes a change in the viscosity of the magnetorheological fluid, which in turn changes the pressure drop at the inlet and outlet of the magnetorheological valve. The structure of the magnetorheological valve mainly includes the shape of the damping gap, the length of the flow channel, and the coil. By optimizing these structures, the liquid resistance pressure drop characteristics of the magnetorheological valve body can be improved and the working energy consumption can be reduced. A vertically positioned energy storage tank is located on the left side of the hydraulic cylinder. The bottom of the energy storage tank is connected to the bottom of the hydraulic cylinder. A connecting pipe is provided between the energy storage tank and the hydraulic cylinder. The left end of the connecting pipe is connected to the bottom of the energy storage tank, and the right end of the connecting pipe is connected to the bottom of the hydraulic cylinder. An oil-gas separator is installed inside the energy storage tank, and nitrogen is filled at the upper part of the energy storage tank. During the operation of the shock absorber, the damping rod moves down and pushes the piston towards the bottom of the hydraulic cylinder. The magnetorheological oil below the magnetorheological valve body flows to the upper part of the hydraulic cylinder through the magnetorheological valve body. At this time, the nitrogen at the upper part of the energy storage tank is compressed. During the process of the damping rod resetting, the nitrogen at the upper part of the energy storage tank moves the magnetorheological oil at the lower part of the energy storage tank back to the hydraulic cylinder through the connecting pipe. When the shock absorber is working, the magnetorheological oil at the lower part of the hydraulic cylinder moves back and forth, which can drive the iron powder in the magnetorheological oil to move and reduce the precipitation of iron powder.

[0004] Preferably, the top of the energy storage tank is detachably fixed with a sealing cap that serves to seal the tank.

[0005] Preferably, the sealing cap is provided with an air nozzle, which is connected to the energy storage tank.

[0006] Preferably, the cross-sectional area of ​​the connecting pipe is smaller than the cross-sectional area of ​​the hydraulic cylinder.

[0007] The above scheme has the following advantages:

[0008] The energy storage tank and the nitrogen gas at its upper end are designed so that, during operation, the damping rod moves downwards, pushing the piston towards the bottom of the cylinder. Magnetorheological fluid below the magnetorheological valve body flows through the valve body to the upper end of the cylinder. At this time, the nitrogen gas at the upper end of the energy storage tank is compressed. During the damping rod's reset process, the nitrogen gas at the upper end of the energy storage tank moves the magnetorheological fluid at the lower end of the tank back into the cylinder via a connecting pipe. When the shock absorber is working, the reciprocating movement of the magnetorheological fluid at the lower end of the cylinder can drive the movement of iron powder within the fluid, reducing iron powder sedimentation. The magnetorheological valve body and the magnetorheological fluid are designed so that the fluid is a magnetic soft-particle suspension. When the liquid is injected into the electromagnetic coil inside the shock absorber piston, the magnetorheological valve body generates a rapidly responsive and highly controllable damping force. The damping rod is hollow, facilitating linear connection to the magnetorheological valve body. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model.

[0010] Reference numerals in the attached diagram: 1. Hydraulic cylinder; 2. Piston; 3. Energy storage tank; 4. Oil-gas separator; 5. Nitrogen; 11. Guide; 12. Magnetorheological fluid; 13. Connecting pipe; 21. Magnetorheological valve body; 22. Damping rod; 23. Wiring harness; 31. Sealing cap; 32. Air nozzle. Detailed Implementation

[0011] like Figure 1As shown, a magnetorheological damper for preventing iron powder precipitation includes a vertically arranged hydraulic cylinder 1, a piston 2 inside the hydraulic cylinder 1, the piston 2 being slidably connected to the inner wall of the hydraulic cylinder 1, a magnetorheological fluid 12 injected into the hydraulic cylinder 1, and a magnetorheological valve body 21 inside the piston 2, the magnetorheological valve body 21 being connected to a power source, a vertically arranged damping rod 22 fixed to the top of the piston 2, a guide 11 fixed to the upper end of the hydraulic cylinder 1, the damping rod 22 extending upward beyond the guide 11, and the damping rod 22 being slidably connected to the guide 11, the damping rod 22 being hollow inside, and a wire harness 23 inside the damping rod 22, the bottom end of the wire harness 23 being electrically connected to the magnetorheological valve body 21 (the magnetorheological valve body 21 is a type of... The working principle of the magnetorheological valve body 21 is based on the rheological effect generated between the magnetic field and the magnetorheological fluid. When the magnetorheological valve body 21 is working, the magnetorheological fluid (magnetorheological oil 12 in this application) transforms from a free-flowing Newtonian fluid to a viscoplastic body with a certain shear yield strength and approximate solid under the action of the magnetic field. The change has the characteristics of being continuous, controllable and reversible. This transformation causes the viscosity of the magnetorheological fluid to change, thereby changing the pressure drop at the inlet and outlet of the magnetorheological valve. The structure of the magnetorheological valve mainly includes the shape of the damping gap, the length of the flow channel and the coil. By optimizing these structures, the hydraulic resistance pressure drop characteristics of the magnetorheological valve body 21 can be improved and the working energy consumption can be reduced. A vertically positioned energy storage tank 3 is located on the left side of the hydraulic cylinder 1. The bottom end of the energy storage tank 3 is connected to the bottom end of the hydraulic cylinder 1. A connecting pipe 13 is provided between the energy storage tank 3 and the hydraulic cylinder 1. The left end of the connecting pipe 13 is connected to the bottom end of the energy storage tank 3, and the right end of the connecting pipe 13 is connected to the bottom end of the hydraulic cylinder 1. An oil-gas separator 4 is installed inside the energy storage tank 3, and nitrogen gas 5 is filled at the upper part of the energy storage tank 3. During use, the damping rod 22 moves downward and pushes the piston 2 toward the bottom of the hydraulic cylinder 1. The magnetorheological oil 12 below the magnetorheological valve body 21 flows through the magnetorheological valve body 21 to the upper end of the cylinder 1. At this time, the nitrogen 5 at the upper end of the energy storage tank 3 is compressed. During the reset process of the damping rod 22, the nitrogen 5 at the upper end of the energy storage tank 3 moves the magnetorheological oil 12 at the lower end of the energy storage tank 3 back to the cylinder 1 through the connecting pipe 13. When the shock absorber is working, the magnetorheological oil 12 at the lower end of the cylinder 1 moves back and forth, which can drive the iron powder in the magnetorheological oil 12 to move and reduce the precipitation of iron powder.

[0012] Preferably, the top of the energy storage tank 3 is detachably fixed with a sealing cap 31 that serves as a seal.

[0013] Preferably, the sealing cover 31 is provided with an air nozzle 32, which is connected to the energy storage tank 3.

[0014] Preferably, the cross-sectional area of ​​the connecting pipe 13 is smaller than the cross-sectional area of ​​the hydraulic cylinder 1.

[0015] Usage process:

[0016] When this invention is in use, if the car is stationary for a long time, the iron powder in the magnetorheological oil 12 will settle to the cylinder 1 and the connecting pipe 13. After the car is started, the damping rod 22 of the shock absorber moves down and pushes the piston 2 toward the bottom of the cylinder 1. The magnetorheological oil 12 below the magnetorheological valve body 21 flows through the magnetorheological valve body 21 to the upper end of the cylinder 1. At this time, the nitrogen 5 at the upper end of the energy storage tank 3 is compressed. During the process of the damping rod 22 resetting, the nitrogen 5 at the upper end of the energy storage tank 3 moves the magnetorheological oil 12 at the lower end of the energy storage tank 3 back to the cylinder 1 through the connecting pipe 13. When the shock absorber is working, the magnetorheological oil 12 at the lower end of the cylinder 1 moves back and forth, which can drive the iron powder in the magnetorheological oil 12 to move and reduce the settlement of iron powder.

[0017] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "horizontal", "vertical", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A magnetorheological damper for preventing iron powder precipitation, comprising a vertically arranged hydraulic cylinder, a piston disposed inside the hydraulic cylinder, the piston being slidably connected to the inner wall of the hydraulic cylinder, characterized in that: The cylinder is filled with magnetorheological fluid, and the piston contains a magnetorheological valve body connected to a power source. A vertically mounted damping rod is fixed to the top of the piston, and a guide is fixed to the upper end of the cylinder. The damping rod extends upward from the guide, and the damping rod is slidably connected to the guide. A vertically mounted energy storage tank is located on the left side of the cylinder, and the bottom end of the energy storage tank is connected to the bottom end of the cylinder. An oil-gas separator is installed inside the energy storage tank, and nitrogen is filled at the upper end of the energy storage tank.

2. The magnetorheological damper for preventing iron powder precipitation according to claim 1, characterized in that: The damping rod is hollow inside, and a wire harness is installed inside the damping rod. The bottom end of the wire harness is electrically connected to the magnetorheological valve body.

3. The magnetorheological damper for preventing iron powder precipitation according to claim 1, characterized in that: A connecting pipe is provided between the energy storage tank and the oil cylinder. The left end of the connecting pipe is connected to the bottom end of the energy storage tank, and the right end of the connecting pipe is connected to the bottom end of the oil cylinder.

4. The magnetorheological damper for preventing iron powder precipitation according to claim 1, characterized in that: The top of the energy storage tank is detachably fixed with a sealing cap that serves to seal the tank.

5. A magnetorheological damper for preventing iron powder precipitation according to claim 4, characterized in that: The sealing cap is equipped with an air nozzle, which is connected to the energy storage tank.

6. A magnetorheological damper for preventing iron powder precipitation according to claim 1, characterized in that: The cross-sectional area of ​​the connecting pipe is smaller than that of the hydraulic cylinder.

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