Microwave Oven Cover Attachment to Prevent Vertical Misalignment
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Solution Overview
Problem
High-frequency heating devices, such as microwave ovens, face issues with the cover's front surface moving vertically during transport due to clearance between the cover and the front plate, and the flange's susceptibility to deformation, leading to oblique attachment and reduced structural integrity.
Innovation Solution
The device incorporates pawls on the cover that engage with side flanges of the front plate, featuring cut-out shapes to match engaging bodies that prevent vertical movement and deformation, ensuring secure attachment and improved resistance during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the cover is attached to the front plate using a flange with only plate thickness strength, then the attachment structure is simple, but the flange is liable to deform and the cover becomes obliquely attached
Solution Approach 1:
The front plate is divided into multiple flanges (upper flange, side flanges, lower flange) that work together to provide distributed support and attachment points, preventing deformation while maintaining structural simplicity
Solution Approach 2:
The flanges are strategically positioned at critical locations (upper, side, and lower portions of the front plate) to provide localized reinforcement where attachment forces are applied, preventing oblique attachment while keeping the overall structure simple
2Ease of operation
If clearance is provided between the cover and front plate for ease of assembly, then assembly is easier, but the cover moves vertically during transport changing the clearance
Solution Approach 1:
The cover is pre-positioned on the front plate during assembly using the clearance, then the flanges are deformed to lock the cover in its final position, achieving both easy assembly and transport stability
Solution Approach 2:
The flanges transition from a flexible state during assembly (allowing movement and clearance adjustment) to a rigid locked state after deformation, maintaining cover position stability during transport while enabling easy assembly
3Ease of manufacture
If the cover flange is made thin for simplicity, then manufacturing is easier, but the flange deforms under load
Solution Approach 1:
Multiple thin flanges (upper, side, and lower flanges) are combined to work together as a unified attachment system, providing sufficient load resistance while keeping each individual flange thin and easy to manufacture
Solution Approach 2:
The flanges utilize plastic deformation as a manufacturing and assembly parameter, allowing thin flanges to be formed and then permanently set into position, achieving both ease of manufacture and adequate strength through the deformation process
Data Source
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AI summary
A high-frequency heating device includes a heating chamber in which an object to be heated is placed, a front plate arranged in a peripheral edge of an opening part of the heating chamber, and a cover which covers the heating chamber and is attached to the front plate. The front plate includes engaging bodies which suppress the vertical movement of the cover. Pawls of the cover are partly cut out so as to meet the engaging bodies of the front plate, so that the pawls of the cover are fixed in a vertical direction by the engaging bodies.