Washing machine damper

Abstract

A damper for a washing machine generates a large damping force for low-frequency vibrations and a small damping force for high-frequency vibrations. A piston (3) connected with a piston rod (4) is embedded in a cylinder (2) in which oil and gas are mixed and sealed, so that the piston (3) is immersed in the oil. No separator such as a free piston is arranged at the boundary between the oil liquid and the gas in the cylinder (2). A throttling passage (7) communicating between the upper and lower chambers (2A, 2B) of the cylinder is provided on the piston (3). The cylinder barrel (2) is connected to one side of the water tank containing the drum, and the piston rod (4) is connected to one side of the housing. For the low-frequency vibration during the washing and rinsing process, the resistance of the oil flowing through the throttling passage (7) is used to generate a large damping force to suppress the shaking of the drum; for the high-frequency vibration during the dehydration process, by actively generating Inflation reduces damping force and absorbs drum vibration, thereby reducing vibration and noise generation.

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

Images