Dual Door Locking Mechanism for Washer Power-Failure Closure
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Solution Overview
Problem
Current water-bearing household appliances, such as washing machines, face challenges in securely locking the door to prevent suffocation risks from small children and accidental openings during intense wash cycles or power failures, with existing ventilation channels not fully addressing the safety concerns.
Innovation Solution
A two-stage locking mechanism is introduced, comprising a pre-locking mechanism that requires power to keep the door closed and a main locking mechanism that maintains closure even without power, using electromagnetic actuators and a control device to ensure secure locking during high-pressure wash phases and power outages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single locking mechanism is used, then the device complexity is low, but the reliability of door closure is insufficient during power failures or high-pressure phases
Solution Approach 1:
The locking mechanism is divided into two independent stages: a pre-locking mechanism that initially secures the door, and a main locking mechanism that provides final secure closure. This segmentation allows each mechanism to have specialized functions, with the pre-locking mechanism handling initial closure and the main locking mechanism ensuring secure closure during high-pressure phases and power failures, thereby resolving the contradiction between reliability and complexity.
Solution Approach 2:
The pre-locking mechanism performs preliminary door closure before the main locking mechanism engages. This preliminary action ensures the door is initially secured, and only when this pre-locking is confirmed does the main locking mechanism activate to provide the final secure closure, creating a staged approach that enhances reliability without requiring both mechanisms to operate simultaneously.
2Object-affected harmful factors
If ventilation channels are provided, then the suffocation risk is reduced, but foam can penetrate outside during spin cycles
Solution Approach 1:
The locking mechanism transitions dynamically between different states: during normal operation the door is fully locked, but during specific phases (such as when power is interrupted or during certain wash programs) the pre-locking mechanism can be deactivated to allow ventilation. This dynamic control allows the system to adapt to different operational conditions, providing ventilation when needed while maintaining secure closure during high-pressure spin cycles.
3Reliability
If the door is locked during power failure, then closure reliability is maintained, but the door cannot be opened for ventilation
Solution Approach 1:
The pre-locking mechanism serves as an intermediary between the main locking mechanism and the door. During power failures, the main locking mechanism remains engaged to maintain secure closure, while the pre-locking mechanism can be independently deactivated to allow the door to be opened for ventilation. This intermediary structure enables selective control, allowing ventilation without compromising the primary security function during critical phases.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The dual locking mechanism effectively reduces the risk of suffocation and accidental door openings, ensuring the door remains securely closed during intense wash cycles and power failures, while allowing ventilation when power is interrupted.
Implementation Method 1
the locking body (2) and/or the closing body (1) are preferably moved between the respective positions by means of electromagnetic actuators, in particular by means of lifting magnets
Implementation Method 2
the door is preferably even pushed open, for example by means of a preloaded return spring
Data Source
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AI summary
The invention relates to a water-bearing household appliance and a method for operating a water-bearing household appliance. The water-bearing domestic appliance has a cleaning container for accommodating objects to be cleaned, a door for closing the cleaning container and a locking mechanism (10) for closing and locking the door. The locking mechanism (10) has a pre-locking mechanism which is designed to keep the door closed after the door has been closed and the pre-locking mechanism activated when the locking mechanism (10) is in a current-carrying state. The locking mechanism (10) also has a main locking mechanism which is designed to keep the door closed after the door has been closed and the main locking mechanism activated when the locking mechanism (10) is in a currentless state.