Ice Duct Cover Control for Obstruction-Triggered Reopening
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Solution Overview
Problem
Ice dispensers in refrigerators often face operational inefficiencies and reliability issues due to foreign substances obstructing the ice duct, leading to incomplete closure and increased cold air leakage.
Innovation Solution
An ice-making device with a duct-covering part that senses abnormal operation loads and automatically opens the duct if it encounters excessive resistance, repeatedly attempting to close until normal operation is restored, and alerts the user through a warning system to remove the obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the duct-covering part is designed to close the duct automatically after dispensing, then the refrigeration efficiency is improved, but the reliability deteriorates when foreign substances obstruct the duct
Solution Approach 1:
The control part monitors the operation load of the duct-covering part during closing operation and uses this feedback information to detect abnormal conditions. When the operation load exceeds a predetermined threshold, the control part determines that a foreign substance is present and prevents improper closing, thereby resolving the contradiction between automatic closing for energy efficiency and reliability when obstructions occur.
2Productivity
If the duct-covering part continuously attempts to close the duct, then the operational efficiency is improved, but the device complexity increases due to load sensing and control mechanisms
Solution Approach 1:
The duct-covering part performs self-diagnosis by sensing its own operation load during closing operation. The control part uses this self-reported information to automatically determine the presence of foreign substances and adjust the closing operation accordingly, eliminating the need for separate detection sensors or complex manual intervention systems.
3Reliability
If the duct-covering part opens the duct when abnormal load is detected, then the reliability is improved by preventing obstruction damage, but the refrigeration efficiency deteriorates due to increased cold air leakage
Solution Approach 1:
When a foreign substance is detected through abnormal operation load, the control part implements periodic closing attempts at predetermined time intervals rather than continuous operation. This periodic action allows the system to maintain reliability by detecting and responding to obstructions while minimizing energy loss from prolonged duct opening, as the duct is closed during normal operation and only opened temporarily when obstructions are detected.
Data Source
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AI summary
An ice-making device includes a duct (10) through which ice is dispensed and a duct-covering part (20) opening and closing the duct (10). When an operation load applied to the duct-covering part (20) while the duct-covering part closes the duct (10) is greater than a preset normal load, the duct-covering part (20) operates to open the duct (10).