Steam Generator Water Level Sensing to Prevent Heater Overheating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional steam generators for washing machines lack a mechanism to accurately measure the water level, leading to potential overheating and fire hazards due to inadequate water supply, as they rely solely on a water level sensor to detect the presence of water without controlling the water supply or heater operations based on the correct water amount.
Innovation Solution
A steam generator with a water level sensor that includes a controller to manage the water supply valve and heater, using three electrodes to sense the minimum and maximum water levels, ensuring the heater operates only when sufficient water is present and stopping operations if water levels fall below a minimum or exceed a maximum, with additional safety features to handle sensor failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple water level sensor is used to detect water presence, then the device complexity is reduced, but the measurement precision of water level is insufficient leading to safety hazards
Solution Approach 1:
The water level sensor is segmented into multiple detection regions (first detection region and second detection region) with different electrode configurations. The first detection region uses electrodes spaced to detect minimum water level, while the second detection region uses differently spaced electrodes to detect maximum water level, enabling precise multi-level measurement without complex equipment.
Solution Approach 2:
The patent transitions from simple presence/absence detection to multi-level water level detection by adding vertical dimensionality to the electrode arrangement. Different electrode spacing configurations create distinct detection zones at different heights, transforming a binary sensor into a multi-level measurement system.
2Device complexity
If water supply control is not implemented based on accurate water level measurement, then the device complexity is reduced, but the reliability of safe operation deteriorates due to overheating risks
Solution Approach 1:
The control unit receives feedback signals from the water level sensor indicating current water level status (minimum, maximum, or intermediate levels). Based on this feedback, the control unit automatically adjusts water supply valve operation and heater operation to maintain safe operating conditions, creating a closed-loop control system that ensures reliability.
Solution Approach 2:
The system performs preliminary water level detection before initiating heater operation. The control unit checks water level status in advance and only permits heater operation when adequate water is present, preventing overheating hazards before they can occur.
3Productivity
If the heater operates without precise water level control, then the productivity is improved by continuous operation, but the object-affected harmful factors increase due to fire danger from case deformation
Solution Approach 1:
The system applies preliminary anti-action by detecting water level conditions before heater operation begins and continuously monitoring during operation. The control unit prevents heater operation when water levels are insufficient and automatically shuts down the heater if water levels drop during operation, counteracting the risk of overheating and fire before they can manifest.
Solution Approach 2:
The control unit continuously receives feedback from the water level sensor during heater operation and adjusts operation accordingly. When the sensor detects minimum water level or case deformation conditions, the control unit automatically shuts down the heater, preventing fire hazards while allowing continuous productive operation under safe conditions.
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
This solution allows for precise control of water supply and heat generation, preventing overheating and ensuring safe operation by accurately measuring the water level, even if the water level sensor malfunctions, thereby enhancing the stability and safety of the steam generator.
Implementation Method 1
a water level sensor for sensing the minimum and maximum level of the water stored in the space of the case
Implementation Method 2
The heater 2 is a sheath heater, and two terminals of the heater 2 are exposed from one side of the case 1 to the outside. The heater 2 serves to generate heat to evaporate water stored in the case 1.
Implementation Method 3
the heater 2 generates heat, and thus evaporates water stored in the case 1. Steam obtained by the evaporation of the water is discharged to the outside
Data Source
AI summary
A washing machine having a steam generator, which generates steam so that the steam is used in a washing or drying operation, and a method for controlling the same are disclosed. The steam generator includes a case having a space for storing water; a heater provided in the space of the case for generating heat; and a water level sensor for sensing the minimum and maximum level of the water stored in the space of the case. A controller controls the water supply valve and the heater according to a result sensed by the water level sensor. The water supply valve is opened and closed, thereby controlling the supply of water to the steam generator.