Fracture structure, arc extinguishing chamber and breaking device

Abstract

The invention relates to the field of high-voltage electrical switches, in particular to a fracture structure, an arc extinguishing chamber and an on-off device. The fracture structure comprises two static contacts arranged at an interval and a movable contact matched with the static contacts, wherein the movable contact is a double-end contact capable of connecting and disconnecting with the two static contacts synchronously through movement. The arc extinguishing chamber and the on-off device adopt the fracture structure respectively. Under the condition of equal voltage grade, excellent on-off capability is guaranteed, auxiliary arc extinguishing mechanisms such as a nozzle in the prior art can be abandoned, and the requirement on the operating power for an operating mechanism is correspondingly reduced, so that the cost input of the arc extinguishing chamber and the operating mechanism can be reduced; meanwhile, the structure is simple and the weight is light, so the brake separating and closing speed of the mechanism can be greatly increased, the on-off performance of the on-off device is further optimized, and the on-off device is economic and practical.

Description

technical field [0001] The invention relates to the field of high-voltage electrical switches, in particular to a fracture structure, an arc extinguishing chamber and a breaking device. Background technique [0002] The arc extinguishing chamber of the existing breaking device generally adopts the arc extinguishing method of blowing out the arc with a cylinder. The arc chamber, the arc chamber includes a porcelain sleeve (that is, the shell), and the static end assembly and the moving end assembly are arranged in the casing. The static end assembly includes a static contact seat, a static contact finger, a static arc contact and a shield, and The assembly includes a moving contact device, a pressure cylinder, a spout, a moving contact seat and a drive rod. The moving contact device includes a moving contact body and a conductive slip ring sleeved on the outer peripheral surface of the moving contact body. Fixed with moving arc contacts. [0003] The working principle of th...

AI Technical Summary

Problems solved by technology

[0003] The working principle of the above-mentioned arc extinguishing chamber is: when the switch is closed, the transmission rod drives the moving contact body and the pressure cylinder to move forward continuously, so that the moving arc contact and the static arc contact, and the moving contact and the static contact finger successively contact each other. During this process, the gas is sucked into the pressure cylinder; when the brake is opened, the transmission rod drives the moving contact body and the pressure cylinder to move backward continuously, and the moving contact and the static contact finger, the moving arc contact and the static arc contact are separated successively, When the arc is generated, the moving contact seat squeezes the gas in the cylinder so that the gas is ejected from the nozzle toward the arc, forming a strong air blow and blowing out the arc. During this process, the transmission rod needs to overcome the contact between the moving contact and the cylinder The compressed air reaction force between the moving contact seats requires the operating mechanism to consume a certain amount of operating work.

[0004] Due to the single-fracture structure, the above-mentioned arc extinguishing chamber needs to adopt the arc extinguishing method of blowing out the arc with the air cylinder, so that the breaking device has the breaking capacity that meets the requirements. The volume of the chamber is large and the mass is also large, which leads to a large consumption of operating power and high requirements for the operating mechanism, which will increase the cost of the arc extinguishing chamber and the operating mechanism, and will also affect the speed of opening and closing

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