Double-piston viscous damper

Abstract

The invention provides a double-piston viscous damper, and belongs to the field of damper devices. The double-piston viscous damper comprises a cylinder body filled with a damping medium, and furthercomprises a piston device arranged on the cylinder body. The piston device comprises a piston rod movably inserted on the cylinder body. A piston body is arranged on the piston rod. A constant dampinghole and a variable damping hole are formed in the piston body. When the piston device moves at relatively low positions, the variable damping hole is in a closed state, and a damping medium flows through the constant damping hole; and when the speed of the piston device reaches the opening speed, the variable damping hole is opened, and the damping medium flows through the constant damping holeand the variable damping hole. According to the double-piston viscous damper, the damping hole area can be gradually enlarged in the process of increasing the damping force along with the speed, and the increase amplitude of the damping force is reduced, so that the purpose of achieving the low speed index is achieved.

Description

technical field [0001] The invention relates to a double-piston viscous damper, belonging to the technical field of viscous dampers. Background technique [0002] The viscous damper is a speed-dependent damping device. The relationship between the damping force and the speed is determined by the damping coefficient and the speed index. It is generally expressed by the formula F=CVα, where α is called the speed index. From the formula, it can be seen that It can be seen that the larger α is, the more sensitive the damping force is to the change of motion speed. From the perspective of energy consumption, the smaller α is, the better the energy dissipation capacity is. Therefore, in general, the velocity index α<1 of the viscous damper. Early viscous dampers used valves to control the damping force, and it was relatively easy to achieve a low speed index. However, the valve structure had defects such as unstable performance, short life, and high cost, and was gradually rep...

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Problems solved by technology

[0004] For the small hole damping structure, the means to reduce the velocity index is to reduce the proportion of the shrinkage force with a high velocity index in the damping force, and increase the proportion of the friction force with a low velocity index. The existing technology is generally achieved by increasing the slenderness ratio of the damping hole. If the slenderness ratio is too large, there will be problems such as processing difficulties and insufficient damper installation space

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