Compressed-air type arc extinguishing chamber capable of moving bidirectionally

Abstract

The invention relates to a compressed air type arc extinguishing chamber capable of moving in two directions. The compressed air type arc extinguishing chamber comprises a double-acting hydraulic cylinder, and the double-acting hydraulic cylinder comprises a cylinder body; the cylinder body is fixed at a static end assembly, an inner cavity and an outer cavity are formed in the cylinder body, a static piston rod is arranged in the inner cavity, the movable piston rod and the static piston rod respectively comprise a plug body and a rod body, and the rod bodies of the static piston rods comprise a first rod body and a second rod body; the outer chamber is an annular chamber and surrounds the outer side of the inner chamber, and a movable piston rod is arranged in the outer chamber; the movable end assembly is in transmission connection with the movable side rod body so as to drive the movable side rod body and the movable side plug body to move forwards and backwards during opening and closing; the static arc contact is fixed on the static piston rod; cavity communicating channels are formed in the two axial ends of the double-acting hydraulic cylinder correspondingly and used for communicating the corresponding ends of the inner cavity with the corresponding ends of the outer cavity, so the static piston rod and the movable side rod body are in linkage, and the movable end assembly is buffered. The double-acting structure can meet the double-acting requirement of the compressed air type arc extinguishing chamber under the working conditions of high voltage class and strong impact.

Description

technical field [0001] The invention relates to a bidirectionally movable compressed gas type arc extinguishing chamber. Background technique [0002] The interrupter is the core component of the high-voltage switch circuit breaker, which has a decisive impact on the breaking performance, reliability, operating power and economy of the circuit breaker. At present, the structures of arc extinguishing chambers at home and abroad generally use two types: single-acting and double-acting. The single-acting type means that the moving end of the arc-extinguishing chamber moves under the driving mechanism to complete the opening and closing process; the double-acting type interrupting chamber not only moves the moving end, but also Moreover, some components at the fixed end of the arc extinguishing chamber can also be moved. The advantage of the double-moving interrupter is that through the relative movement of the moving and static ends, the moving speed of the moving interrupter ...

AI Technical Summary

Problems solved by technology

First, the double-action structure of the shift fork is adopted. In order to achieve the matching of the moving speed of the moving and static ends, this structure has many parts and complex structure, which has the risk of sticking and unstable action.

Second, the double-action structure of the long connecting rod is adopted. This structure is simple, but the problem of vibration and deformation of the long connecting rod is obvious during motion, which is not conducive to the application in products with higher speed and stronger impact.

[0004] Especially for the compressed gas interrupter structure, although the compressed gas interrupter is a mature interrupter structure, the existing compressed gas interrupter structure generally adopts a single-acting structure, the reason is that the compressed gas Arc extinguishing chambers are generally used in ultra-high voltage and ultra-high voltage power grids. For ultra-high voltage and ultra-high voltage power grids, the rated voltage level of the product is higher and the rated breaking current is larger, which requires the arc extinguishing chamber to have greater air blowing capacity and more High breaking speed, in order to meet the requirements of breaking capacity, the compressed air interrupter can only increase the opening and closing speed, and the increase of speed will inevitably lead to the increase of operating power, which will increase the cost and increase the vibration , stability reduction and a series of problems

Moreover, during the opening and closing movement of the compressed air interrupter, due to the high speed, the overshoot vibration of the parts is obvious, which not only causes redundancy in operation work, but also brings redundancy in mechanical design strength.

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