Air Circuit Breaker Door Locking Mechanism Simplification
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Solution Overview
Problem
The existing door locking devices for air circuit breakers have complex structures, leading to increased production and maintenance costs and a high likelihood of defective operations, as they require numerous connection elements.
Innovation Solution
A simplified door locking device for air circuit breakers featuring a transmission shaft, shaft link, link rod, cam plate, and constraint plate with a hook plate and elastic member, allowing the distribution board door to be opened only in a disconnection state through a mechanism where the hook plate releases the constraint plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a door locking device uses numerous connection elements and complex mechanisms to ensure safety, then reliability is improved, but device complexity increases and manufacturing cost rises
Solution Approach 1:
The patent combines the door locking function with the circuit breaker positioning function into a single integrated mechanism. The link rod serves dual purposes: it locks the door when the circuit breaker is in the test position and allows door opening when the circuit breaker is in the disconnection position. This merging eliminates the need for separate locking components while maintaining safety reliability.
Solution Approach 2:
The link rod acts as a universal component that performs multiple functions: it transmits power for positioning the circuit breaker body, controls the door locking state, and interacts with both the constraint plate and hook plate. This multi-functionality reduces the overall number of parts needed in the system.
2Reliability
If a door locking device uses numerous connection elements, then reliability is improved, but manufacturing cost and maintenance cost increase
Solution Approach 1:
The patent merges multiple functions into fewer components, directly reducing the bill of materials and manufacturing complexity. The link rod integrates door locking control with circuit breaker positioning, eliminating the need for separate locking mechanisms and reducing part counts for manufacturing.
Solution Approach 2:
The patent extracts and eliminates unnecessary intermediate connection elements from the traditional locking mechanism. By using the existing link rod and cam plate from the positioning mechanism to also control door locking, the design removes redundant components that would increase manufacturing cost.
3Reliability
If a door locking device uses numerous connection elements, then reliability is improved, but the likelihood of defective operations increases
Solution Approach 1:
The patent combines the door locking control with the circuit breaker positioning mechanism, so that the same link rod and cam plate that control positioning also control door locking. This reduces the number of independent connection elements and potential failure points while maintaining reliable operation through the integrated design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces operational complexity and costs by allowing the distribution board door to be opened only in the disconnection state, enhancing reliability and reducing production and maintenance costs through a straightforward configuration.
Implementation Method 1
a force generating elastic member installed in a portion of the cradle 10
Data Source
Figure 1
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AI summary
A door locking device of a distribution board of an air circuit breaker, including a transmission shaft (18) transmitting power for drawing in and out a circuit breaker body (30), a shaft link (19) rotatably coupled to one end of the transmission shaft (18), a link rod (20) having one end rotatably coupled to a portion of the shaft link (19), a cam plate (21) rotatably coupled to the other end of the link rod and pushing or pulling the circuit breaker body, and a constraint plate installed in a distribution board door, further includes a pressing part protruding from a portion of the link rod, and a hook plate rotatably coupled to a side (10a) of the cradle (10) and having one end in contact with the pressing part to receive rotational force and the other end restricting or releasing the constraint plate, wherein the hook plate releases the constraint plate in a disconnection position.