Heat Exchanging Valve Arrangement for Subfreezing Operation
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Solution Overview
Problem
Valve arrangements designed for standard environments may not operate smoothly in harsh conditions, such as subfreezing temperatures, where they can freeze and become stuck, disrupting fluid flow and movement.
Innovation Solution
A heat exchanging valve arrangement with a rotatable member that aligns different passageways to facilitate fluid communication and includes seals to prevent fluid mixing, allowing heat transfer between the member and fluid to prevent freezing, and a configuration that directs subfreezing air flows and warmed air flows through specific passageways, ensuring smooth operation and preventing freezing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional valve arrangement is used in subfreezing environments, then the valve can operate in standard conditions, but the valve components will freeze and become stuck, disrupting fluid flow
Solution Approach 1:
A heat exchange fluid is introduced as an intermediary substance that circulates through channels in the valve body, transferring heat from warmer regions to the valve member and seat areas to prevent freezing without directly contacting the main fluid stream
Solution Approach 2:
The invention uses a hydraulic/thermal approach by circulating heat exchange fluid through integrated channels in the valve body, using fluid dynamics to transfer thermal energy and prevent freezing of critical components
2Ease of repair
If the valve member is made accessible for maintenance, then maintenance can be performed, but the valve housing structure becomes more complex requiring removable sections
Solution Approach 1:
The valve housing is divided into separate sections with removable portions that allow access to the valve member and seat assembly, enabling maintenance without disassembling the entire valve while maintaining structural integrity during operation
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 ensures continuous operation by preventing freezing of the valve components, maintaining fluid flow and movement integrity even in subfreezing conditions, and effectively directing air flows within an aircraft cabin.
Implementation Method 1
heat transfer between fluid in the manifold and the member prevent freezing the member in one of the first position and the second position
Data Source
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AI summary
A heat exchanging valve arrangement includes, a manifold defining a chamber (18), a first passageway (21), a second passageway (22), a third passageway (23), and a fourth passageway (24), and a member (28) movable relative to the manifold configured to define fluidic communication between the first passageway (21) and the second passageway (22) when in a first position and between the first passageway (21) and the third passageway (23) when in a second position, fluid is flowable into the chamber (18) through the fourth passageway (24) such that fluid is exposed to surfaces of the member (28) regardless of whether the member (28) is in the first position or the second position.