Permanent magnet operating mechanism with air opening damping device for high-voltage and low-voltage switches

Abstract

The invention relates to a permanent magnet operating mechanism with an air opening damping device for high-voltage and low-voltage switches, belonging to the technical field of high-voltage and low-voltage electric appliances. The mechanism mainly comprises a permanent magnet mechanism body consisting of a power output shaft, an upper magnet yoke, an outer magnet yoke, a closing/opening coil, a movable iron core, an inner magnet yoke, a permanent magnet embedded between the inner magnet yoke and the outer magnet yoke, a lower magnet yoke, a guide shaft and an air chamber. In the technical scheme of the invention, the property and structure of an original permanent magnet mechanism are not changed; the movable iron core is used as a piston; and the section of an air escape channel can be controlled through calculating and designing the width of an eddy current prevention groove, a fit clearance and compressed air volume. During the closing operation of a breaker, the movable iron core rushes to the air chamber at a high speed, air pressure acts on the end surface of the movable iron core, and the breaker can obtain an ideal closing damping effect. An air damper and the permanent magnet operating mechanism are integrated into a whole, and therefore the structure of the breaker is simplified and the performance of the breaker is improved; and since an original closing oil damper and accessories are not used, cost is reduced, resources are saved and oil pollution is avoided.

Description

technical field [0001] The invention relates to a permanent magnet operating mechanism for high and low voltage switches with an air opening buffer device, belonging to the technical field of high and low voltage electrical appliances. Background technique [0002] Circuit breaker is a kind of electrical equipment with two-way mechanical action of closing and opening. Due to the requirements of electrical performance: it must have a very high action speed to break the strong current of tens of thousands of amperes; and because only high-speed action can shorten its arcing time, thereby ensuring the expected service life of the circuit breaker. However, the moment of inertia of high-speed action will produce strong impact and rebound of the mechanical system, which is extremely harmful and must be suppressed. Therefore, it is essential to set up a breaker buffer device on the circuit breaker. [0003] Various traditional circuit breakers are equipped with buffer rubber pads...

AI Technical Summary

Problems solved by technology

[0003] Various traditional circuit breakers are equipped with buffer rubber pads, buffer springs or oil buffers to suppress the impact and rebound of the mechanical system during the opening action, but they have their own shortcomings and deficiencies, such as: buffer rubber pads are easy to The aging function is not durable; the buffer spring rebounds greatly and the performance is poor; although the oil buffer has good characteristics, its structure is complex, there are many parts, easy to leak, easy to stain, and flammable

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