Circuit Breaker Movable Part Hook Rib Assembly
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Solution Overview
Problem
Conventional movable parts of gas-insulated switchgear circuit breakers have a high number of components due to bolt-based assembly, leading to increased man-hours and potential loosening issues during use, and a narrow contact surface that requires larger size for increased energization area.
Innovation Solution
A movable part design featuring a puffer cylinder with a hook part and a press-fitted nozzle and main contact, eliminating the need for screws and extending the energized surface longitudinally to reduce size and component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If bolts are used for coupling the nozzle body, nozzle, and main contact, then the components can be assembled together, but the number of components increases and assembly time increases
Solution Approach 1:
The patent merges the coupling function into the puffer cylinder structure by forming a projection that directly engages with the nozzle body, eliminating the need for separate bolts. The puffer cylinder body integrates both the pneumatic function and the mechanical coupling function, reducing component count while simplifying assembly.
2Ease of manufacture
If bolts are used for coupling the components, then the components can be assembled, but the assembly may loosen due to vibration during use
Solution Approach 1:
The coupling mechanism is merged into the puffer cylinder structure with a projection that fits into a corresponding recess in the nozzle body. This integrated design eliminates separate fasteners that can loosen, providing a more reliable vibration-resistant connection while maintaining ease of assembly.
3Reliability
If the contact surface for electrical connection is increased, then the energization area is improved, but the size of the movable part must be increased
Solution Approach 1:
The patent extends the energized surface in the longitudinal direction of the puffer cylinder rather than increasing the radial dimensions. The projection structure provides an elongated contact surface along the length of the cylinder, achieving sufficient energization area without increasing the overall size of the movable part.
4Reliability
If the size of the movable part is increased to increase contact area, then the energization area is improved, but the device becomes larger
Solution Approach 1:
The energized surface is extended along the longitudinal axis of the puffer cylinder through the projection structure. This dimensional approach allows sufficient contact area for reliable energization while maintaining a compact overall size, avoiding the need to increase the radial or cross-sectional dimensions of the movable part.
Data Source
AI summary
A movable part of a circuit breaker for a gas-insulated switchgear is proposed. The movable part includes a puffer cylinder, a nozzle, and a main contact. An outer rib at the rear end of the nozzle is hooked to a hook rib at the front end of the hook part of the puffer cylinder. A chamber guide is provided inside the puffer cylinder so that the nozzle is immobilized. The main contact is mounted on the outer surface of the front end of the hook part. Thus, the number of components constituting the movable part of the circuit breaker is reduced, and the number of bolting points is reduced, thereby greatly reducing man-hours in an assembly work and preventing a main contact separation from occurring due to bolt loosening.