Gravity-Driven Water Filter Structure for Portable Bottles
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Solution Overview
Problem
Conventional portable water bottles with filtration systems require a reservoir for unfiltered water, leading to wasted space and a slow filtration process, necessitating multiple fill and filter cycles, and often include complex venting systems or user-activated pumping mechanisms.
Innovation Solution
An on-demand filter structure using hydrophilic protective layers and activated carbon felt (ACF) for gravity-driven filtration, eliminating the need for a reservoir and venting mechanisms, with a multi-layer filtration material and support system that allows for high flow rates and single-handed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a reservoir is used to hold unfiltered water before filtering, then the filter system can operate, but space is wasted and the filtration process becomes slow, necessitating multiple fill and filter cycles
Solution Approach 1:
The patent removes the reservoir component entirely from the water bottle system. Instead of having a separate reservoir for unfiltered water, the filter element is designed to be directly accessible at the bottle opening, allowing water to be filtered on-demand without requiring a storage chamber for unfiltered water.
Solution Approach 2:
The filter element is segmented into multiple functional layers (hydrophilic protective layer, activated carbon felt layer, hydrophobic protective layer) that work together to enable high-flow-rate filtration directly at the bottle opening, eliminating the need for a reservoir while maintaining effective filtration.
2Reliability
If a venting system is added to vent displaced air as filtered water is added to the chamber, then the filter system can continue to operate, but design complexity and manufacturing costs increase
Solution Approach 1:
The patent removes the venting system from the water bottle design. By enabling direct filtration at the bottle opening without a enclosed chamber, there is no trapped air that needs venting, thus eliminating the entire venting subsystem.
Solution Approach 2:
Instead of filtering water in an enclosed chamber and then dispensing it (which creates air venting needs), the system inverts the approach by filtering water directly at the dispensing location, so water is filtered and dispensed in the same space, eliminating air entrapment issues.
3Productivity
If an active filtration system with a pumping mechanism is used, then water can be pumped through the filter system, but user attention and action are required to enable filtration
Solution Approach 1:
The filter element is designed to be self-activating. When water is poured into the bottle, it automatically flows through the filter element at the opening and into the bottle chamber. The hydrophilic protective layer self-activates upon contact with water, eliminating the need for user activation.
Solution Approach 2:
The patent replaces the mechanical pumping mechanism with a passive gravity-driven flow system. Water flows through the filter element under gravity alone, without requiring any mechanical pump or user activation, simplifying the system while maintaining filtration capability.
4Speed
If the filter system operates at high flow rates, then immediate access to filtered water is provided, but the structure must support higher flow velocities without excessive back pressure
Solution Approach 1:
Different layers of the filter element have different local properties optimized for their specific functions: the hydrophilic layer has high porosity and low resistance for rapid water intake, the activated carbon layer provides filtration, and the hydrophobic layer protects against liquid intrusion while allowing air passage. This local optimization enables high flow rates with controlled back pressure.
Solution Approach 2:
The filter element uses a composite structure combining three different materials (hydrophilic protective layer, activated carbon felt layer, hydrophobic protective layer) with complementary properties. This composite design allows the system to handle high flow rates while managing back pressure through the synergistic effects of the different materials.
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 enables efficient, high-flow rate filtration without a reservoir or venting system, providing immediate access to filtered water and meeting NSF-42 standards for chlorine removal, while reducing manufacturing complexity and user effort.
Implementation Method 1
The first hydrophilic protective layer is configured to receive the stream of water, and more particularly, a contact area in the first surface is configured to receive the stream of water. The first hydrophilic protective layer is also configured to distribute water out a second surface, primarily using gravity.
Implementation Method 2
an activated carbon felt (ACF) layer adjacent to the second surface of the first hydrophilic protective layer, wherein the ACF layer is configured for water filtration, primarily using gravity
Implementation Method 3
The first hydrophilic protective layer is also configured to distribute water out a second surface, primarily using gravity. the ACF layer is configured for water filtration, primarily using gravity
Data Source
AI summary
An on-demand filter structure including a first hydrophilic protective layer comprising a first surface exposable to a stream of water. A contact area on the first surface receives the stream. The first hydrophilic protective layer receives the stream and distributes water out a second surface, primarily using gravity. An activated carbon felt (ACF) layer is adjacent to the second surface, wherein the ACF layer is configured for water filtration, primarily using gravity. A second hydrophilic protective layer includes a third surface adjacent the ACF layer and a fourth surface. The third surface receives filtered water from the ACF layer, and the fourth surface expels the filtered water primarily using gravity, wherein the first and second hydrophilic protective layers sandwich the ACF layer. A cross section of the first hydrophilic protective layer, the ACF layer, and the second hydrophilic protective layer has a curvature.