Hydraulic operating mechanism for high pressure switch and hydraulic working cylinder thereof

Abstract

The invention relates to a hydraulic operating mechanism for a high pressure switch and a hydraulic working cylinder of the hydraulic operating mechanism. The hydraulic working cylinder comprises a cylinder body which is provided with an inner cavity and a main piston which is assembled into the inner cavity of the cylinder body in a sealing sliding mode; an auxiliary piston independent to the piston rod is assembled in a rod cavity of the cylinder body along the left direction and the right direction in a sliding mode; the area difference exists between the total area of a left-side pressure acting surface, which is leftward and acted by hydraulic oil, of the auxiliary piston and the total area of a right-side pressure acting surface, which is rightward and acted by the hydraulic oil, of the auxiliary piston, and a left limiting structure and a right limiting structure for stopping the auxiliary piston at a left limiting part and a right limiting part in the motion stroke of the auxiliary piston are arranged in the rod cavity corresponding to the motion stroke set by the auxiliary piston. The hydraulic working cylinder provided by the invention reduces the acceleration after the motion speed of the piston rod meets the requirement; the hydraulic operating mechanism using the hydraulic working cylinder is further provided.

Description

technical field [0001] The invention relates to a hydraulic operating mechanism for a high-voltage switch for operating a high-voltage switch to open and close. The hydraulic working cylinder of the invention is used in the hydraulic operating mechanism for a high-voltage switch. [0002] Background technique [0003] Ultra-high voltage and ultra-high voltage switches, such as circuit breakers and grounding switches, have high requirements for opening or closing speed due to their high voltage level and large breaking current (circuit breakers require high opening speed, and grounding switches require high closing speed). Brake speed is high), which requires its operating mechanism to provide greater operating power. At present, only the hydraulic mechanism can meet the operating power requirements of the ultra-high voltage and ultra-high voltage switches for opening and closing actions. What is widely used in the existing ultra-high voltage and ultra-high voltage switch...

AI Technical Summary

Problems solved by technology

The opening speed required by the circuit breaker is the average speed within the specified time period or within the stroke period. In order to meet the requirements, when the acceleration and speed of the initial acceleration stage of the hydraulic cylinder are low, it can only be achieved by increasing the hydraulic pressure. The operating work of the mechanism is to increase the acceleration of the initial acceleration stage of the working cylinder. The specific measures are to increase the energy stored in the accumulator, the size of the hydraulic working cylinder, the hydraulic components and the external dimensions of the hydraulic mechanism. This will not only lead to a larger size of the entire hydraulic mechanism Larger cost and floor area increase, and after increasing the operating work, because the hydraulic force will continue to act on the piston, its acceleration will always be kept at a high level, which will cause the piston rod during operation. The maximum speed will be much higher than the average speed, so that not only will a large amount of energy be lost during the deceleration phase, but also the impact and vibration generated during operation will be relatively large

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