Pneumatic cylinder and dynamic end assembly using same for direct-current converting switch

Abstract

The invention relates to a pneumatic cylinder and a dynamic end assembly using same for a direct-current converting switch. The pneumatic cylinder comprises a cylindrical cylinder body; a dynamic contact matching section, which sleeves the external circumferential surface of a corresponding part of a corresponding dynamic contact device, is arranged at the front part of the internal circumferential wall of the cylinder body; a dynamic contact seat matching section for guiding and assembling a corresponding dynamic contact seat is arranged at the rear part of the internal circumferential wall of the cylinder body, wherein the inside diameter of the dynamic contact matching section is more than that of the dynamic contact seat matching section; an opening expanding structure, which corresponds to an opening in the rear end of an air channel in a dynamic contact device, is arranged between the dynamic contact matching section and the dynamic contact seat matching section, wherein the opening expanding structure is that the inside diameter of the front is large, and the inside diameter of the back is small. According to the pneumatic cylinder and the dynamic end assembly using the pneumatic cylinder for the direct-current converting switch, air can be blown out smoothly through the opening expanding structure; the diameter of the dynamic contact matching section can be increased to improve the flowing capability; the diameter of the dynamic contact seat matching section can be reduced to reduce the contact area between the dynamic contact seat and the air in a pneumatic air chamber, and therefore, the pneumatic counterforce can be reduced, the load on an operating mechanism can be lowered down, the operation action is decreased, and as a result, the stability of the whole transmission system can be improved.

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 type sulfur hexafluoride circuit breaker disclosed in the Chinese patent with the application number of 201120054008.8 and the announcement number of CN 202058636 U. The arc extinguishing device includes a static End assembly and moving end assembly. The moving end assembly includes a moving contact de...

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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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