Dual Bellows Force Transfer Insensitive to Temperature
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Solution Overview
Problem
Systems that transfer forces via fluids are prone to inaccuracies due to thermal expansion, especially when multiple fluids are used, making it difficult to maintain accuracy across temperature changes.
Innovation Solution
A dual bellows system comprising a main bellows interacting with a thermally compensating bellows, where the interaction between the two results in a force and/or displacement that is insensitive to temperature changes, utilizing fluids with different thermal properties within a cavity and tube manifold configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If fluid is used to transfer force, then force transmission is achieved, but thermal expansion causes inaccuracy
Solution Approach 1:
The patent changes the physical parameters of the system by introducing a second fluid with different thermal expansion characteristics. This allows the system to maintain force transmission while compensating for thermal effects through the interaction between fluids with contrasting thermal properties, thereby preserving accuracy across temperature variations.
Solution Approach 2:
The system uses a composite approach by combining two different fluids within the same force transmission system. Each fluid contributes its own thermal expansion characteristics, and their interaction creates a compensated system that maintains accuracy despite temperature changes, effectively using composite fluid behavior to solve the thermal expansion problem.
2Reliability
If multiple fluids are used to compensate thermal expansion, then temperature insensitivity is improved, but device complexity increases
Solution Approach 1:
The patent merges the force transmission function and the thermal compensation function into a single integrated system. By combining multiple fluids within one force transmission pathway rather than using separate compensation mechanisms, the design achieves temperature insensitivity without proportionally increasing overall system complexity.
Solution Approach 2:
The multiple fluids serve dual purposes: they transmit force and simultaneously provide thermal compensation. This multi-functionality allows the system to achieve temperature insensitivity without adding dedicated compensation components, thereby improving reliability while limiting the increase in device complexity.
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 dual bellows system effectively transfers force and displacement without significant temperature-related inaccuracies, ensuring precision in applications like watches and other fluid-activated mechanisms.
Implementation Method 1
Systems which transfer of forces via fluids are subject to inaccuracies due to thermal expansion of the fluid. In particular, when more than one fluid is used in the system, differing thermal expansions increase the difficulty of overcoming these inaccuracies.
Data Source
AI summary
A dual bellows system and method that includes a main bellows which interacts with a thermally compensating bellows, whereby interaction of the main bellows with the thermally compensating bellows results in a transfer of force and/or displacement that is insensitive to temperature changes.