Double-Layer Keg Inner Barrel Expansion Control
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Solution Overview
Problem
The existing double-layer kegs experience instability in the spear structure during internal pressurization, leading to displacement and misalignment with liquor dispensing devices due to the expansion and deformation of the inner barrel, which affects the connection stability and ease of installation.
Innovation Solution
A double-layer keg design featuring a rigid outer barrel with a brace supporting the inner barrel, an expansion space between the base and the inner barrel's bottom, and an annular slot in the base to allow downward expansion, ensuring the inner barrel expands and deforms without upward displacement, maintaining stable barrel opening positions and preventing separation from the outer barrel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If high pressure air is filled into the inner barrel to enable liquor dispensing and prevent deformation during transportation, then the inner barrel can fully expand and eliminate stress concentration, but the barrel opening of the inner barrel will be displaced upwardly causing the spear structure to separate from the outer barrel
Solution Approach 1:
The patent introduces an intermediary constraint mechanism (the outer barrel's internal surface pressing against the inner barrel's shoulder) to mediate between the expanding inner barrel and the fixed spear structure. This intermediary connection prevents the barrel opening from displacing upward while still allowing the bottom to expand downward, thus maintaining spear structure stability during pressurization.
Solution Approach 2:
The patent applies different expansion characteristics to different parts of the inner barrel: the bottom portion is allowed to expand downward freely into the expansion space, while the upper portion (shoulder area) is constrained by the outer barrel to prevent upward displacement. This localized differentiation of expansion properties resolves the contradiction between overall structural stability and connection reliability.
2Strength
If the inner barrel is allowed to expand freely under internal pressure, then stress concentration is eliminated, but the spear structure and liquor dispensing devices become misaligned due to displacement
Solution Approach 1:
The patent implements localized expansion control where the bottom of the inner barrel is permitted to expand downward into the expansion space to eliminate stress concentration, while the shoulder region is locally constrained by the outer barrel to maintain the barrel opening position. This selective expansion approach preserves both stress distribution and installation alignment.
Solution Approach 2:
The patent redirects the expansion movement from the vertical dimension (upward displacement of barrel opening) to the downward dimension (expansion of barrel bottom into expansion space). By providing expansion space in the downward direction, the inner barrel can eliminate stress concentration without causing upward displacement that would misalign the spear structure.
3Reliability
If the spear structure is strengthened by increasing connection strength between spear structure and barrels, then displacement is reduced, but the tremendous high pressure still causes split between barrel opening edge and valve member
Solution Approach 1:
The patent extracts the expansion movement from the critical connection region (barrel opening and spear structure) and relocates it to the bottom region (expansion space). By removing the upward displacement component from the spear structure area, the connection strength requirement is reduced while still maintaining reliability under high pressure.
Solution Approach 2:
The patent provides beforehand cushioning by creating an expansion space at the bottom of the inner barrel that absorbs the expansion energy before it can propagate upward to the spear structure. This prior cushioning prevents the tremendous high pressure from causing splits at the barrel opening edge, reducing the need for overly strong connections.
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 design stabilizes the installation of the spear structure and prevents displacement, ensuring secure connection with dispensing devices and reducing stress concentration by allowing controlled expansion and deformation of the inner barrel, thereby enhancing the overall stability and usability of the keg.
Implementation Method 1
the inner barrel expands and deforms, the barrel opening of the inner barrel will be displaced upwardly
Implementation Method 2
high pressure air is required to be filled into the inner barrel when liquor is dispensed, and the liquor is squeezed out by the high pressure air
Data Source
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AI summary
A double-layer keg comprises an outer barrel (1) and an inner barrel (2) made of plastic disposed in the outer barrel (1). A bottom of the outer barrel is fixed with a base (3), and a lower portion of the outer barrel has a brace (11) for supporting a bottom periphery of the inner barrel. A spear structure (4) is installed at a barrel opening of the inner barrel (2), and an upper portion of the inner barrel has a shoulder (21) and a neck (22) disposed around the barrel opening. An inner surface of an upper portion of the outer barrel (1) is pressed against an outer surface of the shoulder (21) and/or the neck (22) of the inner barrel (2). An expansion space (5), provided for the bottom of the inner barrel to expand downward, is disposed between a portion of the bottom of the inner barrel (2) located at an inner side of the brace (11) and the base (3).