Bulkhead Fitting with Guide Rings for Thermal Expansion
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Solution Overview
Problem
Bulkhead fittings in thermoplastic tanks face issues with maintaining constant compression due to thermal and pressure changes, leading to potential leaks as the tank dimensions expand or contract, and excessive vibration can cause the fitting to loosen.
Innovation Solution
A bulkhead fitting design incorporating a threaded shaft, a gasket, a nut, and a biasing means, along with guide rings that allow the biasing means to expand and contract, maintaining constant compression by preventing snagging on the shaft threads, and allowing for user-adjustability of spring compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the tank dimensions expand due to temperature or pressure increases, then the wall thickness reduces, but the compression on the gasket decreases leading to potential leaks
Solution Approach 1:
The bulkhead fitting incorporates a spring mechanism that allows dynamic adjustment of gasket compression. As the tank expands or contracts due to temperature or pressure changes, the spring automatically compresses or extends to maintain constant gasket compression, preventing leaks while accommodating dimensional changes.
Solution Approach 2:
The invention changes the compression parameter dynamically through the spring mechanism. Instead of maintaining fixed compression, the spring allows the compression force to adjust in response to tank dimensional changes, ensuring the gasket remains properly sealed across varying operating conditions.
2Adaptability or versatility
If the bulkhead fitting is manufactured from thermoplastic materials, then it matches the tank material properties, but it undergoes the same expansion and contraction changes exacerbating compression loss
Solution Approach 1:
By incorporating a spring mechanism, the fitting dynamically compensates for dimensional changes. The spring's elastic properties allow it to absorb and counteract the expansion and contraction effects, maintaining stable gasket compression even when both the tank and fitting expand or contract together.
3Object-affected harmful factors
If the fitting is exposed to constant vibration, then the nut portion may loosen, but the biasing means helps maintain engagement
Solution Approach 1:
The spring mechanism provides continuous dynamic biasing force that keeps the nut engaged with the threaded shaft. During vibration, the spring's elastic recovery maintains constant contact pressure, preventing the nut from loosening while allowing for minor positional adjustments caused by vibrational movements.
4Reliability
If guide rings are added to prevent snagging of the biasing means, then the structure becomes more complex, but the constant compression is maintained
Solution Approach 1:
The guide rings segment the interaction between the spring and threaded shaft by providing dedicated guidance surfaces. This segmentation prevents the spring from snagging on the threads while maintaining the necessary compression function, adding minimal structural elements with high functional value.
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 ensures a substantially constant compression on the gasket and nut, preventing leaks and maintaining engagement, even under thermal and pressure changes, and vibration, thereby enhancing the reliability of the bulkhead fitting.
Implementation Method 1
A biasing means, which is preferably positionable between the first and second guide rings and radially outward of the sidewall, allows the first and second guide rings to expand and contract relative to one another
Implementation Method 2
tanks, especially those manufactured from thermoplastics, react mechanically to thermal changes due to temperature changes in the surrounding atmosphere, changes in temperature of the fluid contained in the tank, and changes due to solar heating
Data Source
AI summary
Disclosed herein is a bulkhead fitting. The bulkhead fitting includes biasing means and a plurality of guide rings. In a preferred embodiment, a first guide ring is provided with an annular sidewall and a base extending radially outward from the sidewall, and a second guide ring is configured to mate with the first guide ring. Biasing means is positioned between the guide rings and radially outward of the sidewall to allow expansion and contraction of the first and second guide rings relative to one another, while preventing or inhibiting the biasing means from catching in the threads of the shaft or otherwise contacting the shaft.