Washing machine damper

Abstract

The invention relates to a damper of a washing machine which produces a large damping force for low-frequency vibration while small damping force for high-frequency vibration. A piston (3) coupled with a piston rod (4) is embedded inside a cylinder which is filled with mixed oil liquid and gas, and the piston (3) is infused in the oil liquid. No free piston and other isolators are arranged at the borderline of the oil liquid and gas inside the cylinder (2). The piston (3) is provided with a throttle path (7) communicated with two chambers (2A and 2B). The cylinder (2) is connected with one side of a water tank holding the cylinder, while the piston rod (4) is connected with one side of the shell. For low-frequency vibration during the washing and rinsing process, a large damping force is generated through the resistance of the oil liquid flowing through the throttle path (7) so as to restrain the shaking of the cylinder; while for the high-frequency vibration during the dehydrating process, inflated air is generated actively to reduce the damping force and to absorb the vibration of the cylinder so as to reduce the vibration and noise.

Description

technical field [0001] The invention relates to a damper for a washing machine, which is used for supporting a water tank containing a drum of a drum type washing machine. Background technique [0002] Generally speaking, in a drum-type washing machine such as a fully automatic washing machine, a spring and a damper are installed between a substantially cylindrical water tank having a rotating shaft substantially The drum into which the laundry is loaded is rotatably supported, and the water tank is suspended by the spring and the damper, thereby absorbing and suppressing vibration generated by the rotation of the drum. [0003] As general dampers used in drum-type washing machines, friction dampers and hydraulic dampers are known. Although the friction damper generates damping force through the sliding friction of the friction member, the damping force due to the wear of the friction member changes greatly with time, and it is difficult to maintain a long-term stable dampi...

AI Technical Summary

Problems solved by technology

[0007] However, the hydraulic damper described in the above-mentioned Patent Document 1 has the following problems: when the disc valve is in contact with the piston at a large amplitude, knocking noise is generated when the disc valve is in contact with the piston, which becomes the cause of noise; , and cannot be positioned relative to the piston, so the rise of the damping force deviates, and a stable damping force cannot be obtained; since the disc valve is floating supported by the piston rod, the structure is complicated. In addition, the sliding guide part of the disc valve requires high Dimensional accuracy, therefore, will increase manufacturing costs

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