Leak-Triggered Drain Pump Control in Water-Conducting Appliances
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Solution Overview
Problem
Existing water-conducting domestic appliances, such as dishwashers and washing machines, face issues with water safety and energy efficiency due to the risk of water leakage and subsequent drain pump overheating, as well as standby power losses from permanent mains voltage supply in safety circuits.
Innovation Solution
A water safety switch connected to a controller, which can be either electrically or optically connected, initiates control steps to prevent water escape and activates the drain pump, while ignoring main switch signals and using a switched-mode transformer to avoid overheating, with self-diagnosis capabilities and a reset mechanism to ensure safe operation without standby losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the water cutoff switch connects the drain pump directly to the electrical mains to ensure water safety, then water safety is improved, but the drain pump risks overheating due to uninterrupted operation
Solution Approach 1:
The patent introduces a controller as an intermediary between the water cutoff switch and the drain pump. When the water cutoff switch detects a leak and closes the circuit, the controller receives this signal and intelligently controls the drain pump's operation, enabling periodic or pulsed activation rather than continuous operation. This mediator approach maintains water safety while preventing drain pump overheating through smart control algorithms.
2Speed
If the logic circuit is permanently supplied from mains voltage to enable immediate response to leakage, then response speed is improved, but standby power losses increase
Solution Approach 1:
The patent implements preliminary action by pre-programming the controller with leakage response algorithms and safety protocols. The controller is powered up by the water cutoff switch only when needed, yet can immediately execute pre-prepared control sequences for the drain pump and other safety components. This eliminates the need for permanent power supply to logic circuits while maintaining fast response capability through advance programming.
3Reliability
If the controller is activated by the water safety switch to prevent water damage, then water safety is improved, but device complexity increases
Solution Approach 1:
The patent achieves universality by designing the controller to perform multiple functions: monitoring the water cutoff switch signal, controlling the drain pump operation, managing the main switch coordination, and providing system diagnostics. This multi-functional approach consolidates what could be multiple separate control circuits into a single intelligent unit, reducing overall system complexity while maintaining comprehensive water safety protection.
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 solution enhances water and device safety by preventing water damage and overheating, reducing energy consumption, and providing self-diagnostic functionality to ensure continuous safety monitoring and efficient operation of water-conducting domestic appliances.
Implementation Method 1
the water safety switch might involve an optical fiber embodied as an immersion bar which is connected to the controller for optical conduction
Data Source
AI summary
A water-conducting domestic appliance having a drain pump, a controller to activate the drain pump, and a water safety switch that has a first switch position to react to escaping water, wherein the water safety switch is connected to the controller. If a fault causes water to escape, the water safety switch switches into the first switch position so as to connect the controller to an electrical mains.