CN104389942A - Three-working surface rotary type damper based on magnetorheological fluid - Google Patents

Abstract

The invention relates to a three-working surface rotary damper based on magnetorheological fluid. The cylindrical surface and two end surfaces of the rotor are used as working surfaces, and the outer surface of the rotor is effectively used without increasing the volume of the rotor, thereby increasing the working area of the rotor. The device is composed of excitation coil, magnetorheological fluid, rear end cover, rotor, shell, magnetic isolation ring, screw, sealing ring, bearing, cover and front end cover. The shell and two end covers constitute the stator of the damper, a sealing ring is installed between the rotor and the stator, magnetorheological fluid is filled in the cavity between the rotor and the stator, a magnetic isolation ring is installed between the end cover and the shell, and the excitation coil is wound Inside the end cap, two sets of excitation coils generate magnetic fields in opposite directions. When energized, the rotor of the damper moves to cut the magnetic field lines. The structure of the device of the invention makes the cylindrical surface and the two end surfaces of the rotor both working surfaces, significantly increases the working surface of the damper rotor, has compact structure, simple components, and is easy to process and assemble.

Description

A three-face rotary damper based on magnetorheological fluid

technical field

The invention relates to a damper, in particular to a three-working surface rotary damper based on magneto-rheological fluid.

Background technique

Magnetorheological fluid has broad application prospects in many engineering fields such as vibration reduction and vibration suppression, mechanical transmission, precision machining and sealing due to its superior rheological properties. An important branch of technical research.

At present, magnetorheological dampers can be divided into linear magnetorheological dampers and rotary magnetorheological dampers according to their working methods. The research on linear magneto-rheological damper is earlier, and the research on its structure design and mechanical model is relatively mature. However, some applications, such as rehabilitation robots, variable speed and transmission systems, etc., require the damper to provide a controllable damping torque of continuous rotation. Therefore, the research on the rotary magneto-rheological damper has important application significance.

The rotary magnetorheological damper works by filling the magnetorheological fluid with controllable yield stress between the shell and the rotor, and the working area of the rotor is one of the main factors affecting the performance of the damper. At present, most rotary magneto-rheological dampers use the two end surfaces of the rotor as the working surfaces, and dampers with this structure usually have larger radial dimensions. Some rotary magneto-rheological dampers use the cylindrical surface of the rotor as the working surface. Although increasing the axial and radial dimensions of the rotor can increase the output torque of the damper, this structure fails to utilize the end surface of the rotor. In order to obtain a larger damping torque, a multi-disk magneto-rheological damper has appeared. This kind of damper also uses the end face of the rotor as the working surface. When working, the end faces of multiple working discs interact with the stator respectively to Obtain greater damping torque. In order to make full use of the outer surface of the rotor and improve the performance of the damper without increasing the complexity of its structure, a new rotary magnetorheological damper structure is designed to increase the working surface of the damper.

Contents of the invention

The technical problem to be solved by the present invention is to provide a rotor surface that effectively utilizes the outer surface of the rotor, increases the working area of the rotor, and has a compact structure, simple components, and is easy to process and assemble without increasing the volume of the rotor. Three-face rotary damper with magnetorheological fluid.

In order to effectively obtain the structure and function of the above-mentioned three-face rotary damper based on magnetorheological fluid, the present invention is realized in the following manner: the device is composed of an excitation coil, magnetorheological fluid, and End cover, rotor, casing, magnetic isolation ring, screw, sealing ring, bearing, cover and front end cover. The cylindrical surface and two end surfaces of the rotor are used as the working surface; the rear end cover, the shell and the front end cover are fixed by screws to form the stator of the damper; a sealing ring is installed between the rotor and the stator, and magnetorheological fluid is filled between the rotor and the stator In the cavity, a magnetic isolation coil is installed between the rear end cover and the front end cover and the shell, and the excitation coil is wound in the two end covers; the two sets of excitation coils generate a magnetic field in the opposite direction. When the power is turned on, the rotor of the damper performs cutting. The magnetic induction line moves; the rear end cover, shell and front cover are made of DT4E electromagnetic pure iron with high magnetic permeability, low coercive force and good demagnetization performance; the magnetorheological fluid adopts MRF-132LD magnetic iron developed by Lord Company of the United States. rheological fluid.

When the excitation coil is energized, a magnetic circuit is generated in the rotor, stator and the gap between them, thereby generating a magnetic field around the magnetorheological fluid, and the magnetorheological fluid is instantly magnetized, making the magnetorheological fluid change from the original Newtonian fluid to The high-viscosity, low-fluidity Bingham fluid makes the rotor move continuously to cut the magnetic field, and the purpose of stepless adjustment of the damping force is achieved by adjusting the current of the excitation coil. The device can adjust the damping force of the damper by changing the current flowing through the excitation coil according to the magnitude of the rotor torque, and provide a controllable damping torque of continuous rotation.

The positive effect of the three-working surface rotary damper based on magnetorheological fluid in the present invention is that the outer surface of the rotor is effectively used without increasing the volume of the rotor, and the working area of the rotor is increased. , and the whole device has a compact structure, simple components, and is easy to process and assemble. In addition, the device can adjust the damping force of the damper by changing the current flowing through the excitation coil according to the magnitude of the rotor torque, so as to provide a controllable damping torque of continuous rotation.

Description of drawings

The figure is a schematic diagram of the internal structure of a three-working surface rotary damper based on magnetorheological fluid according to the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

In the figure, the present invention is a three-face rotary damper based on magnetorheological fluid. Its internal structure is composed of excitation coil 1, magnetorheological fluid 2, rear end cover 3, rotor 4, housing 5, Ring 6, screw 7, sealing ring 8, bearing 9, cover 10, front end cover 11 are formed. The cylindrical surface and two end surfaces of the rotor 4 are used as the working surface; the casing 5, the rear end cover 3, and the front end cover 11 are fixedly connected by screws 7 to form the stator of the damper; a sealing ring 8 is installed between the rotor 4 and the stator, and magnetorheological fluid 2 is filled in the cavity between the rotor 4 and the stator; the magnetic isolation ring 6 is installed between the rear end cover 3, the front end cover 11 and the casing 5, and the excitation coil 1 is wound in the two end covers; the two sets of excitation coils 1 produce opposite The direction of the magnetic field 12, when energized, the rotor 4 of the damper moves to cut the magnetic induction line 12; the rear end cover 3, the outer shell 5, and the front end cover 11 use the DT4E type with high magnetic permeability, low coercive force, and good demagnetization performance Electromagnetic pure iron; magnetorheological fluid 2 adopts MRF-132LD type magnetorheological fluid developed by Lord Company of the United States.

When the excitation coil 1 is energized, a magnetic circuit 12 is generated in the rotor 4, the stator and the gap between them, thereby generating a magnetic field around the magnetorheological fluid 2, and the magnetorheological fluid 2 is instantly magnetized, so that the magnetorheological fluid 2 changes from the original The Newtonian fluid is transformed into Bingham fluid with high viscosity and low fluidity, and at the same time, a shearing torque that hinders the rotation of the rotor 4 is generated on the cylindrical surface and the two end surfaces of the rotor 4. The magnitude of the current passing through the excitation coil 1 is adjusted so that the rotor 4 stops rotating when the shearing torque generated by the magneto-rheological fluid 2 is sufficient to overcome the rotor torque.

Claims (3)

1., based on three working surface rotary type dampers of magnetic flow liquid, this device is made up of field coil, magnetic flow liquid, rear end cover, rotor, shell, magnetic partiting ring, screw, seal ring, bearing, overspread, front cover; It is characterized in that: shell (5), rear end cover (3), front cover (11) form the stator of damper, install seal ring (8) between rotor (4) and stator, magnetic flow liquid (2) is filled in the cavity between rotor (4) and stator; Rear end cover (3), between front cover (11) and shell (5), magnetic partiting ring (6) is installed, field coil (1) is wound in two end cap, and two groups of field coils (1) produce rightabout magnetic field (12).

2. a kind of three working surface rotary type dampers based on magnetic flow liquid as claimed in claim 1, is characterized in that: the cylndrical surface of rotor (4) and two end faces are as working surface.

3. a kind of three working surface rotary type dampers based on magnetic flow liquid as claimed in claim 1, is characterized in that: rear end cover (3), shell (5), front cover (11) select the DT4E type electromagnetic pure iron that permeability is high, coercivity is low, demagnetization performance is good; The MRF-132LD type magnetic flow liquid that magnetic flow liquid (2) adopts Lord company of the U.S. to develop.