Door-opening indicator for drum washing machine and door-opening control method therefor
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Solution Overview
Problem
Users of drum washing machines face confusion when determining the appropriate time and method to open the door due to the lack of clear instructions, as the door is typically locked during operation to prevent water and heat from escaping, leading to uncertainty about when it is safe to open it.
Innovation Solution
A door-opening indicator system featuring a touch sensor and color-changeable indicator lamp set connected to the computer programmable controller, which displays different colors to indicate whether the door is openable or not, allowing users to easily determine the door's state and control its opening through a touch-sensitive interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the door is locked during operation to prevent water and heat from escaping, then safety and energy retention are improved, but user convenience and clarity deteriorate due to lack of clear instructions on when and how to open the door
Solution Approach 1:
The patent implements a feedback mechanism through visual indicators (lights) that continuously inform the user about the door's locked state and the washing machine's operational status. The control unit processes sensor information and provides real-time visual feedback to guide the user on when and how to open the door, resolving the information asymmetry between the locking system and the user.
Solution Approach 2:
The patent introduces an intermediary system consisting of the control unit and visual indicators that mediates between the automatic door locking mechanism and the user. This intermediary translates the complex locked/unlocked states and operational conditions into simple, intuitive visual signals, making the system's state comprehensible to the user without requiring technical knowledge.
2Object-generated harmful factors
If the door switch automatically locks during drive state, then water containment is improved, but user confusion increases due to lack of clear door-opening instructions
Solution Approach 1:
The visual indicator system provides continuous feedback about the washing machine's operational state and door status. Different light patterns indicate whether the door is locked, unlocked, or if the machine is in a state where opening is safe, thereby compensating for the loss of information that would otherwise require the user to infer from the machine's behavior.
Solution Approach 2:
The patent uses color changes in visual indicators to convey different states of the door and machine operation. Color-coded signals provide intuitive information about whether the door can be opened, reducing the information gap created by automatic locking mechanisms that don't communicate their state to the user.
3Object-affected harmful factors
If the door remains locked throughout the washing process, then safety is improved, but user interaction and operational clarity deteriorate
Solution Approach 1:
The visual indicator system provides real-time feedback about temperature-related safety conditions. By displaying whether the door is safe to open based on temperature and operational state, the system maintains safety while enabling clear user interaction, allowing users to understand when it is appropriate to access the drum.
Data Source
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AI summary
Disclosed are a door-opening indicator for a drum washing machine and a door-opening control method therefor. A door body is provided with a door lock that locks and unlocks the door body controlled by a computer programmable controller (1) of the washing machine. The door-opening indicator is disposed on the door body of the drum washing machine and/or a front portion of the washing machine, and includes a touch sensor (3) and a color-changeable indicator lamp set (7) that are connected to the computer programmable controller (1) of the washing machine. The touch sensor (3) includes a touch area (9) and an opening/closing sensor (8); the touch sensor (3) detects a touch signal and transmits the signal to the computer programmable controller (1) of the washing machine, the computer programmable controller (1) of the washing machine directly controls opening and closing of the door body and controls the indicator lamp set (7) to change colors according to changes of a washing state.