Fall prevention structure of electric component cover in refrigeration cycle apparatus
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Solution Overview
Problem
The existing fall prevention mechanisms for electric component covers in refrigeration cycle apparatuses are inadequate, leading to inefficiencies during maintenance as operators must manually hold the cover to prevent it from falling when unscrewing, thereby impairing working efficiency.
Innovation Solution
A fall prevention structure featuring a catch with a backward-extending and upward-extending portion on the electric component cover that is inserted into a slot on the casing, ensuring the cover remains secured even when unscrewed, preventing it from falling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the electric component cover is fixed only with a screw, then the structure is simple, but the cover falls when the screw is unscrewed
Solution Approach 1:
The fixing mechanism is divided into two independent parts: a screw for securing the cover and a catch for preventing the cover from falling. The catch includes a backward-extending portion and an upward-extending portion that work together to engage with the insertion slot, separating the functions of attachment and retention.
Solution Approach 2:
The catch acts as an intermediary element between the electric component cover and the casing. It mediates the interaction by providing an additional engagement mechanism that prevents the cover from falling when the screw is removed, without requiring direct modification of the cover or casing structures.
2Ease of manufacture
If the screw is the only engagement unit, then the device is simple to manufacture, but working efficiency deteriorates due to manual holding requirement
Solution Approach 1:
The catch structure provides self-service functionality by automatically preventing the cover from falling when the screw is unscrewed. The backward-extending portion and upward-extending portion work together to engage with the insertion slot, eliminating the need for manual holding operations and improving working efficiency without significantly complicating the manufacturing process.
3Device complexity
If no additional engagement unit is provided, then the device complexity is low, but the cover cannot be prevented from falling
Solution Approach 1:
The engagement system is segmented into two distinct functions: the screw provides securing functionality while the catch provides retention functionality. This segmentation allows each component to be optimized for its specific purpose, with the catch's backward-extending and upward-extending portions designed specifically to engage with the insertion slot and prevent falling.
Solution Approach 2:
The catch structure merges the prevention of falling with the existing screw-based securing mechanism. By combining these two functions into a unified engagement system where the catch works in conjunction with the screw, the design achieves both security and retention without requiring completely separate systems.
Data Source
AI summary
A fall prevention structure of an electric component cover in a refrigeration cycle apparatus includes an electric component box housing an electric component of a refrigeration cycle apparatus. The electric component box includes a casing, a side of which is open, and an electric component cover configured to cover, in an upright position, an opening of the casing and to be screwed to the casing. The electric component cover includes a catch including a backward-extending portion and an upward-extending portion. The backward-extending portion extends backward from an upper end portion of the electric component cover. The upward-extending portion extends upward from an end portion of the backward-extending portion. In a state in which the electric component cover is screwed to the casing, the catch is inserted into an insertion slot disposed in a portion extending in an up-down direction of the casing. When the electric component cover is unscrewed from the casing, the electric component cover does not fall from the casing by the catch being caught by a portion above the insertion slot.