Variable damping shock absorber and drum washing machine using shock absorber

Abstract

The invention discloses a variable damping shock absorber and a drum washing machine using the shock absorber. The shock absorber disclosed by the invention comprises a shock absorber barrel, a piston rod and a piston, wherein the shock absorber barrel comprises a damping cavity and a buffering cavity; the piston rod is inserted into the barrel; the piston is fixedly arranged on the piston rod in the damping cavity; the buffering cavity is communicated with the outside; the damping cavity is filled with magnetic fluid; an electric magnet and a throttling orifice for the magnetic fluid to pass through are arranged in the piston; the electric magnet is connected with a master controller through a wire in the piston rod; and the master controller changes the liquidity of the magnetic fluid by controlling the magnitude of current and utilizing the magnetism variation of the electric magnet, thereby realizing the purpose of adjusting the damping in real time. In the washing machine disclosed by the invention, the real-time damping adjustment can be realized according to the rotating speed of a motor through the shock absorber. The variable damping shock absorber and drum washing machine disclosed by the invention have the advantages of simple structure, high sensitivity and obvious shock absorption effect, and are suitable for being popularized and used.

Description

technical field [0001] The invention relates to a shock absorber, in particular to a variable damping shock absorber and a drum washing machine using the shock absorber. Background technique [0002] The existing drum-type washing machine includes a shell forming an appearance; a washing tub arranged in the casing for storing washing water; a drum rotatably arranged in the washing tub for washing and dehydrating clothes; The back of the laundry bucket is connected to the drive motor of the rotating shaft of the drum. A door through which laundry is put in or out is rotatably provided on a front surface of the housing, and a bracket for supporting a rotating shaft of the drum is provided behind the tub. The spring is fixed to the casing at the upper part of the washing tub, and the shock absorber for attenuating the vibration transmitted to the washing tub from the drum is provided at the lower part of the washing tub. [0003] Those skilled in the art know that in the shoc...

AI Technical Summary

Problems solved by technology

[0008] (1) The amplitude capture component, that is, the sensor, is added to the control system of the washing machine, and the damping of the shock absorber changes throughout the process, which greatly increases the burden on the control system and manufacturing cost, and is completely unnecessary

In addition, this is an ideal design, which is difficult to manipulate and realize in the actual process, and in actual operation, the effect is very insignificant

[0009] (2) In the magnetic fluid shock absorber described above, the electromagnet is located at one end of the shock absorber and is fixed, which cannot effectively control the fluidity of the magnetic fluid at the moving position, so that the damping force cannot be accurately controlled

[0010] (3) As long as the rotation speed of the washing machine is higher than the resonance frequency during operation, the vibration amplitude will become smaller and smaller as the rotation speed increases. At this time, the damping force can be completely eliminated to prevent the vibration energy from being transmitted to the shell, so the vibration amplitude can be captured in real time And it is not necessary to control the damping of the shock absorber

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