Pressure cylinder and DC transfer switch moving end assembly using the same

Abstract

The invention relates to a compressed air cylinder and a moving end assembly of a DC converter using the compressed air cylinder. Wherein the pressure cylinder includes a cylindrical cylinder body, the front part of the inner peripheral wall of the cylinder body has a moving contact mating section for being sleeved on the outer peripheral surface of the corresponding part of the corresponding moving contact device, and the rear part of the inner peripheral wall has a Corresponding moving contact seat guide assembly of the moving contact seat matching section, the inner diameter of the moving contact seat matching section is larger than the inner diameter of the moving contact seat matching section, and the inner diameter of the moving contact fitting section and the moving contact seat matching section is provided with an inner diameter that is large at the front and small at the rear. A flaring structure corresponding to the rear opening of the gas channel in the moving contact device. The flaring structure can ensure the smooth blowing of the air flow. The moving contact fitting section can be set to a larger diameter to improve the flow capacity, and the moving contact seat fitting section can be set to a smaller diameter to reduce the gas in the moving contact seat and the compressed air chamber. contact area, so as to reduce the compressed air reaction force, reduce the burden on the operating mechanism, reduce its operating work, and improve the reliability of the entire transmission system.

Description

technical field [0001] The invention relates to a compressed air cylinder and a moving end assembly of a DC converter using the compressed air cylinder. Background technique [0002] The compressed air cylinder is a key component of the arc extinguishing device. It not only serves as the main conductive circuit for flow, but also needs to store and accommodate a certain amount of gas to provide sufficient, continuous and powerful air blowing for the arc extinguishing of the switch to ensure the current flow. successfully disconnected. The compressed air cylinder in the prior art is such as the compressed air cylinder in the arc extinguishing device of the improved self-energy sulfur hexafluoride circuit breaker disclosed in the Chinese patent with the application number 201120054008.8 and the notification number CN202058636U. The arc extinguishing device includes a static end assembly And the moving end assembly, the moving end assembly includes the moving contact device, t...

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Problems solved by technology

[0003] However, when it is necessary to increase the flow capacity of the arc extinguishing device, in order to ensure the flow area between the pressure cylinder and the moving contact, the diameter of the pressure cylinder needs to be increased, because the moving contact seat and the inner wall of the pressure cylinder need to maintain a sliding and sealing fit , increasing the diameter of the compressed air chamber will lead to an increase in the contact area between the moving contact seat and the gas in the compressed air chamber, which will increase the compressed air reaction force during the opening process, and the corresponding operating device needs to provide a larger More power and more operating work, higher requirements on the operating device, but also affect the breaking capacity of the arc extinguishing device

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