Cap Valve Displacement Restriction for Controlled Liquid Discharge
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Solution Overview
Problem
The cap in conventional delaminatable containers with check valves often experiences degradation in usability due to excessive discharge of contents or unwanted pulsation, resulting from the degree of squeezing causing the valve body to open too widely.
Innovation Solution
A cap design featuring a displacement restricting section that limits the valve body's displacement to 0.09 times or less of the flow aperture's diameter, using elastic pieces and projections to control the valve's movement and prevent excessive opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the valve body is allowed to open widely to increase flow area, then the discharge amount increases, but excessive discharge and pulsation occur causing degradation of usability
Solution Approach 1:
The patent changes the geometric parameters of the flow passage by providing a tapered section that narrows the flow area. Specifically, the flow passage has a tapered section where the cross-sectional area gradually decreases in the downstream direction, which limits the maximum flow area even when the valve body is fully opened. This parameter change resolves the contradiction by controlling the discharge amount through geometric design rather than relying on full valve opening.
Solution Approach 2:
The patent applies local quality by creating a specific tapered section only in the downstream portion of the flow passage, while other sections maintain different characteristics. The tapered section is positioned strategically to control the flow area at the critical discharge point, allowing the valve body to open fully for maximum flow potential while the tapered section locally restricts the actual flow area to prevent excessive discharge and pulsation.
2Productivity
If the valve body displacement is increased to improve discharge efficiency, then more contents are discharged, but pulsation occurs causing degradation of usability
Solution Approach 1:
The patent changes the flow passage geometry by introducing a tapered section that gradually reduces the cross-sectional area in the downstream direction. This geometric parameter change smooths the flow characteristics and prevents sudden pressure changes that cause pulsation, while still allowing the valve body to displace sufficiently for efficient discharge.
Solution Approach 2:
The tapered section acts as a cushioning element by gradually reducing the flow area, which dampens pressure fluctuations and prevents the formation of pulsation before it can propagate through the system. This beforehand cushioning effect is built into the flow passage geometry to prevent harmful pulsation while maintaining discharge efficiency.
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 design enhances usability by restricting the valve body's displacement, preventing excessive discharge and pulsation, ensuring a controlled and appropriate amount of contents is released.
Implementation Method 1
a biasing member to bias the valve body in a seating direction
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3C
AI summary
A cap with improved usability is provided. The present invention provides a cap including a cap body to be fitted to a mouth of a container, wherein the cap is configured to include: a valve seat having a flow aperture; a valve body to be separated from or seated on the valve seat so as to open and close the flow aperture; and a biasing member to bias the valve body in a seating direction, and configured to increase a flow area in which contents flow with an increase in a displacement of the valve body, and the cap further includes a displacement restricting section to restrict the displacement of the valve body.