Straw Cup Vent Seal for Pressure Equalization Without Leakage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing straw cups face difficulties in pressure equalization and liquid leakage when tilted or knocked over, as negative pressure is created during liquid withdrawal, leading to challenges in air entry and preventing unwanted liquid escape.
Innovation Solution
A straw cup design featuring a lid with a dispensing port and vent, incorporating a flexible frusto-conical seal member that allows air inflow while restricting liquid outflow, ensuring pressure equalization and preventing leakage by moving radially downward upon pressure differential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a vent is provided to allow air into the container for pressure equalization, then liquid withdrawal becomes easier, but liquid may escape through the vent when the cup is tilted or knocked over
Solution Approach 1:
The patent employs a flexible membrane that can deform selectively in response to pressure differentials. The membrane acts as a smart barrier that allows air to pass through when negative pressure exists during liquid withdrawal, but automatically seals to prevent liquid leakage when the cup is tilted or inverted, thus resolving the contradiction between ease of operation and prevention of harmful effects
Solution Approach 2:
The vent mechanism transitions from a static opening to a dynamic system where the flexible membrane can change its state based on pressure conditions. The membrane moves between an open state (allowing air flow during drinking) and a closed state (preventing liquid leakage during tilting), making the system adaptive to different operational conditions and resolving the contradiction
2Object-generated harmful factors
If the seal member is made rigid to prevent liquid leakage, then liquid escape is restricted, but air cannot enter the container for pressure equalization
Solution Approach 1:
The flexible membrane replaces rigid sealing structures with a compliant material that can selectively respond to pressure differentials. The membrane's flexibility allows it to deform and permit air passage during negative pressure conditions while maintaining an effective seal to prevent liquid leakage, thus resolving the contradiction between leakage prevention and pressure equalization
3Ease of operation
If a vent is opened to allow free air flow, then pressure equalization is effective, but the structure becomes complex and liquid leakage risk increases
Solution Approach 1:
The patent extracts the complex mechanical valve or gate mechanisms from the vent structure and replaces them with a simple flexible membrane that passively responds to pressure differentials. This extraction of complexity allows effective pressure equalization through the membrane while minimizing structural complexity and eliminating the need for additional control mechanisms
Solution Approach 2:
The flexible membrane serves itself by automatically responding to pressure differentials without external control. The membrane opens or closes the vent passage based solely on the pressure conditions, eliminating the need for complex control systems, sensors, or actuating mechanisms, thus resolving the contradiction between effective pressure equalization and structural simplicity
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 effectively allows air to enter the container to equalize pressure, preventing liquid leakage even when the cup is tilted or inverted, ensuring smooth liquid withdrawal without spillage.
Implementation Method 1
allowing an inward flow of air through the vent and over the seal member upon the introduction of a pressure differential across the vent where the pressure outside of the container is greater than the pressure inside of the container
Data Source
AI summary
A straw cup includes a container and a lid releasably attached to the container for closing a container open top. A lid body has a dispensing port and a vent each extending therethrough. The body further has a downward depending inner collar which surrounds the dispensing port. A straw extends through the dispensing port and has a mounting member provided at a lower end thereof. The mounting member is received in the inner collar and includes a flexible seal member having a downward frusto-conical shape. The seal member normally contacts an inner surface of the inner collar. The seal member is movable radially downwardly and away from the inner surface allowing an inward flow of air through the vent and over the seal member upon the introduction of a pressure differential across the vent where the pressure outside of the container is greater than the pressure inside of the container.