Slide-In Fan Unit Attachment for Stable Connector Retention
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Solution Overview
Problem
Existing attachment structures for fan units in electrical equipment lack efficiency in maintenance and stability of electrical connections, particularly when accessing the fan from a single direction and experiencing vibrations that can disconnect wiring.
Innovation Solution
A detachable attachment structure featuring a guide mechanism for sliding the fan unit into place and a retaining mechanism to secure it, allowing easy attachment and detachment without fasteners, while mitigating stress on connectors to prevent disconnection during vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fastener such as a bolt is used to attach the fan unit to the main body, then the attachment is secure and reliable, but the maintenance process becomes complex and time-consuming
Solution Approach 1:
The attachment structure is divided into separate components: a retaining mechanism with retaining members on the main body and corresponding retaining grooves on the fan unit. This segmentation allows the fan unit to be securely held while enabling simple linear detachment without complex fasteners, resolving the contradiction between secure attachment and easy maintenance.
Solution Approach 2:
Instead of using active fastening elements (bolts, screws) that require tightening and loosening operations, the design uses passive retaining features (retaining members and grooves) that automatically engage and disengage through simple linear motion. This inversion of the fastening approach eliminates complex operations while maintaining secure attachment.
2Device complexity
If the fan unit is made accessible from one direction only, then the equipment structure is compact, but the maintenance of the fan becomes difficult
Solution Approach 1:
The attachment structure enables dynamic access to the fan unit through simple linear insertion and removal motions. The guide mechanism ensures proper alignment during insertion, while the retaining mechanism secures the unit in place. This dynamic attachment system allows maintenance from a single direction without requiring complex disassembly, resolving the contradiction between compact structure and maintenance accessibility.
3Reliability
If the connector is rigidly fixed to prevent movement, then the electrical connection is stable, but the wiring may disconnect under vibration stress
Solution Approach 1:
The connector includes a movable terminal portion that can move in the connection direction, providing built-in cushioning against vibration stress. This movable design absorbs shock and prevents stress concentration that would otherwise cause wiring disconnection, while maintaining stable electrical connection under normal conditions. The guide mechanism also provides beforehand alignment to prevent misconnection.
4Manufacturing precision
If a guide mechanism is added to guide the slide motion, then the attachment precision is improved, but the device complexity increases
Solution Approach 1:
The guide mechanism and retaining mechanism are merged into a single integrated attachment structure. The guide members guide the insertion motion while the retaining members simultaneously secure the fan unit in place. This merging of functions reduces the number of separate components and simplifies the overall structure while maintaining high attachment precision through the coordinated action of guide and retain features.
Data Source
AI summary
An attachment structure enabling more efficient work in performing maintenance of a fan of a fan unit and a more stable electrical connection between a main body of an electrical equipment and a fan unit. An attachment structure configured to detachably attach a fan unit including a fan and a casing housing the fan to/from a main body of an electrical equipment includes a guide mechanism configured to guide a slide motion of sliding the casing in one direction relative to the main body to dispose the casing at a mounting position, and a retaining mechanism configured to restrict movement of the casing relative to the main body in a direction opposite the one direction when the casing is disposed at the mounting position by the slide motion.