Quick Disconnect Coupling With Internal Valves for LRU Fluid Service
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The process of replacing line replaceable units (LRUs) in fluid conveyance systems, such as hydraulic and coolant systems, is labor and time intensive due to the need to drain and refill systems, and bleed air, which is inefficient.
Innovation Solution
A quick disconnect coupling system with movable valves that allow for fluid communication between primary and secondary passageways, enabling rapid connection and disconnection without the need for extensive draining and refilling, and incorporating relief and check valves to manage pressure and fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional LRU replacement process is used, then system reliability is maintained, but labor time and replacement duration increase significantly
Solution Approach 1:
The coupling is divided into two separate parts (first part and second part) that can be independently connected or disconnected. This segmentation allows the LRU to be replaced by simply disconnecting the second part while the first part remains connected to the system, eliminating the need to drain and refill the entire system.
Solution Approach 2:
The quick disconnect coupling is pre-configured with internal valves and sealed passageways that automatically maintain system pressure and prevent fluid leakage when disconnected. This preliminary configuration allows for rapid LRU replacement without requiring system draining or refilling operations.
2Loss of time
If quick disconnect coupling is implemented, then LRU replacement time is reduced, but system complexity increases due to additional valves and passageways
Solution Approach 1:
Multiple functions are merged into a single integrated coupling device. The quick disconnect mechanism, primary fluid passageway, secondary fluid passageway, and internal valves are combined into one unit that replaces multiple separate components, reducing overall system complexity despite adding functionality.
Solution Approach 2:
The coupling device performs multiple functions simultaneously: it serves as a fluid conduit, a disconnect mechanism, and a pressure management system through its internal valves. This multi-functionality eliminates the need for separate draining and refilling operations, reducing time loss without proportionally increasing complexity.
3Reliability
If internal valves are added to control secondary passageway flow, then fluid management during connection/disconnection is improved, but manufacturing complexity increases
Solution Approach 1:
The internal valves are nested within the coupling body structure. The first and second valves are positioned inside the first part housing, with their seats and moving parts integrated into the existing passageway geometry. This nesting approach allows the valves to be manufactured as integral components rather than separate assemblies, simplifying the manufacturing process.
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
Facilitates rapid and efficient replacement of LRUs by allowing fluid communication and pressure management, reducing labor and time required for maintenance tasks.
Implementation Method 1
the relief valve is moved from the closed position towards the open position by fluid pressure
Implementation Method 2
one or both of the first and second valves is a check valve
Data Source
AI summary
A quick disconnect coupling can include a first part and a second part. The first part can define a primary fluid passageway and a secondary fluid passageway and can include a first valve movable between open and closed positions to control flow through the first part secondary fluid passageway. The second part can define a second part defining a primary fluid passageway and a secondary fluid passageway and can include a second valve movable between open and closed positions to control flow through the second part secondary fluid passageway. In one aspect, the second part is removably connectable to the first part such that, when connected the first and second part primary passageways are placed in fluid communication with each other and the first and second valves are operable between the open and closed positions to selectively place the secondary fluid passageways of the first and second parts in fluid communication with each other.