Direct-acting electromagnetic trip device with simplified regulation
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Solution Overview
Problem
Existing electromagnetic trip devices in circuit breakers with adjustable instantaneous operating current require complex assembly processes due to multiple components and intricate regulation mechanisms, making them difficult to mount and assemble.
Innovation Solution
A direct-acting electromagnetic trip device with a simplified structure comprising a housing, regulation mechanism, linkage mechanism, electromagnetic system, and trip mechanism, where the rotary knob and regulation rod drive the linkage mechanism to actuate the iron core, regulating the tripping current by adjusting air gap lengths, and featuring a compact design for easier assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rotary regulation mode with multiple springs is used to adjust the electromagnetic trip device, then the tripping current can be regulated, but the structure becomes complex and assembly becomes difficult
Solution Approach 1:
The patent merges multiple springs into a single integrated elastic element that provides both the pre-tensioning force and the reactive force against the electromagnetic suction force. This consolidation reduces the number of components while maintaining the tripping current regulation capability through the rotation of a single regulation rod that adjusts the elastic element's elongation.
Solution Approach 2:
The regulation rod serves multiple functions: it rotates to adjust the elastic element's elongation, thereby regulating both the reactive force of the electromagnetic suction force and the size of the air gap simultaneously. This multi-functionality eliminates the need for separate components for different adjustment parameters.
2Adaptability or versatility
If multiple springs are mounted to achieve regulation, then the tripping current can be adjusted, but the assembly process becomes complicated
Solution Approach 1:
Multiple springs are merged into a single elastic element that can be mounted as one component rather than multiple separate springs. This significantly simplifies the assembly process while maintaining the full adjustment range for tripping current through the rotary regulation mechanism.
Solution Approach 2:
The complex assembly of multiple springs is extracted and replaced with a single elastic element combined with a rotary regulation rod mechanism. This extraction of the essential function (elastic force provision and adjustment) from the complex multi-spring assembly simplifies manufacturing and assembly.
3Measurement precision
If a complex regulation mechanism with many components is used, then precise tripping current control is achieved, but the device size increases
Solution Approach 1:
The regulation mechanism merges the elastic element and regulation rod into a compact integrated structure that provides precise tripping current control through rotational adjustment. This consolidated design occupies less space than distributed multi-spring mechanisms while maintaining control precision through the adjustable air gap and elastic force.
Solution Approach 2:
The regulation mechanism utilizes rotational movement in a circular dimension rather than linear extension in a straight line. The regulation rod rotates to adjust the elastic element's elongation, converting linear adjustment requirements into rotational motion, which saves space and creates a more compact device volume.
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 device is simple, compact, and easy to assemble, with a reduced number of components, providing stable and safe performance by smoothly regulating tripping currents through the rotary knob and regulation rod mechanism, enhancing assembly convenience and reducing costs.
Implementation Method 1
an electromagnetic suction force and the size of an air gap... the electromagnetic system 3... the iron core 31 of the electromagnetic system 3 actuates
Implementation Method 2
the electromagnetic system 3 further comprises an elastic element 32, and the elastic element 32 pushes the iron core 31
Data Source
AI summary
A direct-acting electromagnetic trip device including a housing, and a regulation mechanism, a linkage mechanism, an electromagnetic system and a trip mechanism which are arranged in the housing. The regulation mechanism is connected with the linkage mechanism, the linkage mechanism is connected with one end of an iron core of the electromagnetic system, and the linkage mechanism is connected with the trip mechanism at the same time. The regulation mechanism includes a rotary knob and a regulation rod, wherein the rotary knob is abutted against and engaged with the regulation rod, and the regulation rod is abutted against and engaged with the linkage mechanism. The electromagnetic system further includes an elastic element that pushes the iron core to allow the linkage mechanism to be abutted against the regulation rod and allow the rotary knob to be abutted against the regulation rod.