Oil buffer and circuit breaker operating mechanism using the oil buffer

Abstract

The invention relates to an oil damper and a breaker actuator using the oil damper. The oil damper comprises an inner cylinder, a piston which is arranged in an internal cavity of the inner cylinder, a piston rod which is arranged on the piston, and an outer cylinder which sleeves the periphery of the inner cylinder, wherein an annular gap is reserved between the inner cylinder and the outer cylinder; the cylinder body of the inner cylinder is provided with a front radial oilhole and a rear radial oilhole which communicate the internal cavity of the inner cylinder with the annular gap; the piston has a sliding fit section which forms a guided sliding fit with the piston rod; the piston rod is provided with a front limit structure and a rear limit structure which define the forward-backward moving limitation of the piston; the spacing between the front and the rear limit structures is larger than the axial length of the sliding fit section; the piston is provided with an axial oilhole which penetrates through the piston in a front-rear direction; and the piston rod is provided with a piston cap which is used to block the front orifices or the rear orifices of the axial oilhole and is located at the front or rear side of the piston. The invention provides the oil damper which is capable of achieving different damping effects when performing opening or closing operations, and the breaker actuator which uses the oil damper.

Description

technical field [0001] The invention relates to the field of circuit breakers, in particular to an oil buffer and a circuit breaker operating mechanism using the oil buffer. Background technique [0002] The oil buffer is a safety protection device that can slow down the rigid collision during operation. It can prolong the action time of the impact load, absorb and transform the energy of the impact load. In addition to its protective function, the oil buffer used in the spring operating mechanism of the high-voltage circuit breaker can also affect the product performance of the circuit breaker. Existing oil buffers such as the oil buffer disclosed in Chinese patent CN201629279U "A buffer device for accelerating the initial separation speed of the circuit breaker operating mechanism", the oil buffer includes an inner cylinder whose axis extends along the front and rear directions and is sleeved on the The outer cylinder on the periphery of the inner cylinder has an annular ...

AI Technical Summary

Problems solved by technology

The problem of this existing oil buffer is: 1. At the beginning of the opening and closing of the dynamic and static contacts, the piston starts to move, and the oil damps the movement of the piston, which affects the opening, closing, and closing of the piston. The initial speed of the moving contact when closing. The moving contact is easily damaged by the arc. Although the setting of the speed-up spring increases the initial opening speed of the moving contact, it cannot increase the initial closing speed of the moving contact. In addition, the speed-up spring The setting of the oil buffer also makes the structure of the oil buffer extremely complicated, and it also involves the sealing problem of the speed-up spring end, which greatly increases the difficulty of assembling the oil buffer and the production cost; 2. Due to the flow of hydraulic oil during the opening and closing process The same path leads to the same damping effect of the oil buffer, which is very inconsistent with the actual working conditions of the spring operating mechanism, because in actual work, the smaller the impact of the oil buffer on the closing process, the better. Because the closing force is expected to be completely transmitted to the moving contact instead of being absorbed by the oil buffer, the oil buffer is more for the absorption of the opening force

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