Bathtub Water Level Sensing via Airtight Tube Pressure Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current water level detection systems in bathtubs are limited by their material specificity and accuracy, as capacitive sensors only work with plastic tubs and ultrasonic sensors can be inaccurate due to obstructions, necessitating a solution that can detect water levels continuously and dynamically across various materials.
Innovation Solution
A water level detection system utilizing a pressure sensor and airtight tube coupled to a bathtub, which measures pressure differentials to determine water height and temperature, allowing for dynamic control through a processing circuit that adjusts water levels and temperature based on real-time data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If capacitive sensors are used for water level detection, then the system can detect water level in plastic tubs, but the system is limited to plastic tubs only and cannot work with other materials
Solution Approach 1:
The patent introduces an airtight tube as an intermediary element that transmits pressure information from the water column to the pressure sensor. This mediator allows the system to work with any bathtub material (plastic, acrylic, fiberglass, cast iron) by measuring the air pressure in the sealed tube, which varies with water level, thus achieving universal compatibility while maintaining detection reliability.
2Adaptability or versatility
If ultrasonic sensors are used for water level detection, then the system can work with various bathtub materials, but the detection accuracy is reduced due to obstructions
Solution Approach 1:
The airtight tube serves as a protected transmission channel that shields the pressure measurement mechanism from obstructions. By sealing the tube and using it to transmit pressure changes from the water level to the sensor, the system achieves accurate measurements without being affected by bathtub obstructions, splashes, or vapor that would interfere with ultrasonic sensors.
Solution Approach 2:
The patent replaces the acoustic field-based ultrasonic detection with a mechanical pressure-based detection system. The pressure sensor measures the air pressure in the airtight tube, which is mechanically coupled to the water level through hydrostatic pressure, providing a more reliable and obstruction-resistant measurement method.
3Device complexity
If pressure sensors are used without an airtight tube, then the system structure is simpler, but the detection accuracy is affected by temperature changes and water hammer effects
Solution Approach 1:
The airtight tube acts as a buffer and isolation mechanism between the water column and the pressure sensor. It transmits only the hydrostatic pressure corresponding to the water level while filtering out transient pressure disturbances like water hammer and thermal expansion effects, thereby improving measurement accuracy without significantly complicating the system.
Solution Approach 2:
The airtight tube provides a cushioning effect by using the compressibility of air to dampen sudden pressure changes caused by water hammer or rapid temperature variations. This pre-cushioning protects the pressure sensor from inaccurate readings due to transient effects.
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 system provides accurate and continuous water level detection and control, enabling overflow protection and user personalization, with improved accuracy across different bathtub materials and reducing temperature and water hammer effects.
Implementation Method 1
measures pressure differentials to determine water height and temperature
Data Source
AI summary
A water level detection system includes a water containing vessel, an airtight tube fluidly coupled to the water containing vessel, a pressure sensor fluidly coupled to the airtight tube, and a water level control unit communicably coupled to the pressure sensor. The water level control unit is configured to control at least one of a height of water within the water containing vessel or a temperature of the water based on pressure data from the pressure sensor.