Fluid Reservoir Venting With Capillary Delivery for Leak Protection
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Solution Overview
Problem
Existing fluid supply apparatuses and oral care implements suffer from leakage due to air expansion caused by temperature increases or pressure decreases, leading to unwanted fluid leakage.
Innovation Solution
A fluid supply apparatus with a housing containing a storage cavity and a capillary member, featuring vent apertures that allow gas exchange while preventing fluid flow, ensuring leakage protection regardless of orientation or environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the storage cavity is sealed to prevent fluid leakage, then fluid containment is improved, but air expansion due to temperature increases or pressure decreases causes internal pressure buildup leading to unwanted fluid leakage
Solution Approach 1:
A hydrophobic membrane is introduced as an intermediary element between the storage cavity and the external environment. This membrane selectively permits gas molecules to pass through while blocking liquid molecules, thereby equalizing pressure without causing fluid leakage. The membrane acts as a smart barrier that responds differently to gases versus liquids, resolving the contradiction between sealing and pressure equalization.
Solution Approach 2:
The invention changes the physical-chemical parameters of the sealing interface by using a hydrophobic membrane with specific surface properties. The membrane's hydrophobicity parameter allows it to repel liquid while permitting gas permeation, fundamentally altering how the sealing interface behaves under different pressure and temperature conditions. This parameter change enables the system to maintain both seal integrity and pressure equilibrium.
2Stress or pressure
If vent apertures are made larger to improve gas exchange, then pressure equalization is improved, but fluid can flow through the vents causing leakage
Solution Approach 1:
The hydrophobic membrane serves as an intermediary that replaces traditional open vent apertures. It provides a controlled pathway for gas exchange while maintaining a physical barrier against liquid flow. The membrane's selective permeability properties allow it to function as both a vent and a seal simultaneously, eliminating the need to choose between vent size and fluid containment.
Solution Approach 2:
The hydrophobic membrane is a porous material with carefully controlled pore sizes and surface properties. The pores are sufficiently small to prevent liquid passage due to surface tension effects, yet large enough to allow gas molecules to diffuse through. This porous structure with hydrophobic surface treatment creates a one-way selective barrier that permits pressure equalization while preventing fluid leakage.
3Reliability
If the device is designed to maintain pressure equilibrium, then leakage protection is improved, but the device becomes more complex with additional components
Solution Approach 1:
The hydrophobic membrane performs multiple functions simultaneously: it acts as a seal, a pressure equalization valve, and a liquid barrier all in one component. This multi-functionality eliminates the need for separate vent holes, seals, and pressure regulation mechanisms, thereby reducing overall device complexity while maintaining superior leakage protection.
Solution Approach 2:
The hydrophobic membrane operates autonomously based on the physical properties of the materials involved. It automatically responds to pressure differences and temperature changes without requiring external control mechanisms, sensors, or active components. The membrane's hydrophobic nature inherently provides the leakage protection function, making the system self-regulating and simplifying the overall device architecture.
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
Prevents fluid leakage by maintaining ambient pressure equilibrium through vent apertures, ensuring consistent fluid flow and preventing unwanted leakage across various orientations and conditions.
Implementation Method 1
A channel formed of one or more wicking or capillary members extends through at least a portion of the oral care implement to deliver a fluid via one or more fluid outlets (e.g., formed in a head portion of the toothbrush) via capillary action
Implementation Method 2
Each of the plurality of vent apertures is configured such that a fluid within the storage cavity cannot flow through the vent apertures
Data Source
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AI summary
A fluid supply apparatus with leakage protection. The apparatus includes a housing defining a storage cavity having a total volume including a fluid portion and a gas portion. The storage cavity extends along a cavity axis from a first end to a second end. A capillary member is fluidly coupled with the fluid. A plurality of vent apertures are formed into the housing, each forming a passageway between the storage cavity and an external atmosphere and each configured such that the fluid cannot flow through the vent apertures at ambient temperature and pressure equilibrium between the storage cavity and the external atmosphere. The vent apertures may be located and arranged on the housing such that irrespective of vertical and angular orientation of the housing relative to a gravitational vector at least one of the vent apertures is in spatial communication with the gas.