Bimetal Thermal Sensor Pressing Holder Design
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Solution Overview
Problem
Existing thermal sensors with bimetal components face challenges in accurately positioning the bimetal, leading to variations in response speed and potential noise or abrasion due to manufacturing errors and the need for precise clearance adjustments between the bimetal edge and the case's inner surface.
Innovation Solution
A thermal sensor design incorporating a deformable pressing holder between the cover member and the bimetal, which presses the bimetal to the case's bottom portion, ensuring a consistent pressing force and surface pressure to enhance heat transfer and maintain bimetal deformability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a narrow clearance is set between the bimetal edge and the case inner surface to accurately position the bimetal, then the positioning accuracy is improved, but the bimetal cannot be inverted properly due to interference with the case inner surface
Solution Approach 1:
A pressing holder is introduced as an intermediary component between the cover member and the bimetal. This pressing holder applies controlled pressure to the bimetal, enabling accurate positioning without requiring tight clearance between the bimetal edge and case inner surface, thus avoiding interference while maintaining positioning accuracy.
Solution Approach 2:
The clearance parameter between the bimetal edge and case inner surface is changed from narrow to wide, and instead of relying on this clearance for positioning, a pressing force parameter is introduced through the pressing holder to achieve accurate positioning and enable proper inversion.
2Ease of operation
If a wide clearance is set between the bimetal edge and the case inner surface to allow proper inversion, then the bimetal invertability is improved, but the positioning accuracy deteriorates causing variation in response speed
Solution Approach 1:
The pressing holder serves as a mediator that provides controlled pressure to the bimetal, enabling accurate positioning even with wide clearance. This eliminates the trade-off between clearance width and positioning accuracy, allowing both wide clearance for inversion and accurate positioning through the pressing mechanism.
3Manufacturing precision
If precise adjustment of clearance is attempted to improve quality and performance, then the positioning accuracy is improved, but the manufacturing complexity increases due to difficulty in exact adjustment
Solution Approach 1:
The pressing holder is introduced as a mediator component that replaces the complex clearance adjustment process with a simpler pressing mechanism. Instead of precisely adjusting and maintaining specific clearance dimensions, the pressing holder provides the necessary control through its pressing action, significantly simplifying the manufacturing process.
Solution Approach 2:
The manufacturing approach changes from controlling geometric clearance parameters to controlling the pressing force parameter through the pressing holder. This parameter substitution simplifies the manufacturing process while maintaining or improving positioning accuracy.
4Ease of manufacture
If the bimetal is allowed to move inside the case to accommodate manufacturing errors, then the ease of assembly is improved, but noise and abrasion are generated
Solution Approach 1:
The pressing holder acts as an intermediary that constrains the bimetal's movement within the case while still accommodating manufacturing errors. By providing controlled pressure, it prevents excessive movement that would cause noise and abrasion, while allowing sufficient tolerance for assembly variations.
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
This design improves the response speed and stability of the bimetal by securely transferring heat and maintaining accurate positioning, reducing noise and abrasion, while simplifying the manufacturing process and enhancing overall sensor performance.
Implementation Method 1
a case (4) which accommodates the bimetal (3) and transfers external heat to the bimetal (3)
Implementation Method 2
the pressing holder (21) is forced to be elastically deformed by the deforming force of the bimetal (3)
Data Source
AI summary
A thermal sensor with a simple structure can secure the deformability of a bimetal, and accurately control the position of the bimetal, to increase the response speed (heat response) of the bimetal. The thermal sensor includes a bimetal, a case, and a cover member. A pressing portion is provided between the cover member and the bimetal to press the bimetal to a bottom portion of the case. The pressing portion is deformable in accordance with the deformation of the bimetal.