Air Circuit Breaker Base Bottom Plate Transformer Mounting
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Solution Overview
Problem
Existing air circuit breakers have complex assembly processes and high production costs due to thick line pressing plates and the need to remove the bottom plate for current transformer replacement, making them inconvenient for maintenance.
Innovation Solution
The air circuit breaker design features a base frame and bottom plate that are buckled together, with a current transformer mounted on the outer side of the base bottom plate, and static and transformer mounting cavities provided vertically for efficient assembly and maintenance, using a cover plate and epoxy glass line pressing plate for cost reduction and simplified assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thick line pressing plate made of DMC material is used to cover the controller slot, then the controller lead is protected, but the assembly cost increases and assembly convenience deteriorates due to the need for three screws
Solution Approach 1:
The patent replaces the expensive DMC material line pressing plate with a thin plate made of epoxy glass material that is integrated with the base bottom plate. This substitution uses a cheaper material that can be molded as a single piece, eliminating the need for separate screws and reducing assembly complexity while maintaining protective function.
Solution Approach 2:
The line pressing plate is merged with the base bottom plate to form an integrated structure. The epoxy glass material is molded to include both the base bottom plate and the line pressing plate as a single component, eliminating the need for separate fastening elements and reducing assembly steps.
2Reliability
If the current transformer is mounted between the base and bottom plate, then the current information is acquired and transmitted to the controller, but the replacement requires removal of the bottom plate making assembly complicated and maintenance inconvenient
Solution Approach 1:
The patent segments the mounting structure by providing a dedicated transformer mounting cavity in the base bottom plate with an independent access opening. The current transformer is mounted in this separate cavity, which can be accessed and serviced independently from the base assembly, allowing replacement without removing the entire bottom plate.
Solution Approach 2:
The transformer mounting cavity acts as an intermediary structure that provides independent access to the current transformer. The cavity includes mounting columns and fixing holes that allow the transformer to be secured and replaced through a dedicated access opening, serving as a mediator between the transformer and the external environment for easy maintenance.
3Stability of the object's composition
If the base frame and bottom plate are separately assembled with multiple components, then the structure is stable, but the assembly process becomes complex and time-consuming
Solution Approach 1:
The patent combines the base frame and base bottom plate into an integrated molded structure using epoxy glass material. The single-piece construction maintains structural stability while eliminating multiple assembly steps, thereby improving production efficiency and reducing assembly time.
Solution Approach 2:
The integrated base structure serves multiple functions simultaneously: it provides mechanical support, houses the controller slot with integrated line pressing plate, and contains the transformer mounting cavity with independent access. This multi-functional design reduces the number of separate components needed while maintaining structural integrity.
Data Source
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AI summary
A air circuit breaker comprises a circuit breaker body. The circuit breaker body comprises a body base and an operating mechanism provided on one side of the body base. The body base comprises a base frame and a base bottom plate which are buckled with each other. The operating mechanism is provided on the outer side of the base frame. The circuit breaker further comprises a current transformer which is provided on the outer side of the base bottom plate. According to the air circuit breaker of the utility model, the current transformer is provided on the outer side of the base bottom plate, such that the assembly is convenient, the production cost is reduced, and the disassembly and maintenance are convenient and rapid at the same time. Static busbar mounting cavities and transformer mounting cavities are provided vertically along the base bottom plate in opposite directions in a layered manner, such that the internal space of the base bottom plate can be used reasonably.