Air Dryer Parallel Flow Paths with Interlock Valve Control
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Solution Overview
Problem
Existing air dryers in compressed air systems are susceptible to reduced effectiveness or complete failure due to improper valve alignment, which can disrupt the continuous supply of clean and dry compressed air.
Innovation Solution
The air dryer design incorporates multiple parallel flow paths with check and exhaust valves, a diverter valve, and an interlock system that ensures continued operation even if one exhaust valve fails open, allowing the system to maintain fluid communication and prevent misalignment issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If duplicate parallel flow paths are added to ensure continuous compressed air supply, then reliability is improved, but device complexity increases
Solution Approach 1:
The air dryer is divided into multiple parallel flow paths (first flow path with first check valve and first exhaust valve, second flow path with second check valve and second exhaust valve), allowing independent operation of each path to ensure continuous compressed air supply even when one path fails
Solution Approach 2:
The control air valve switches between different pressure states (first pressure to second pressure) to control the diverter valve and exhaust valves, enabling automatic switching between parallel flow paths based on operational status
2Reliability
If check valves and exhaust valves are installed in each flow path to prevent misalignment issues, then reliability is improved, but device complexity increases
Solution Approach 1:
Check valves are pre-installed in each flow path to prevent backflow and improper alignment before failure occurs, while exhaust valves are positioned to automatically close if misalignment is detected, preventing system failure
Solution Approach 2:
The diverter valve acts as an intermediary component that directs compressed air flow between parallel paths based on control signals, isolating failed valves from affecting the entire system
3Ease of operation
If control air valves and diverter valves are used to manage flow paths, then ease of operation is improved, but device complexity increases
Solution Approach 1:
Control air valves receive feedback from pressure sensors or valve position sensors to automatically switch between parallel flow paths, maintaining continuous operation without manual intervention
Solution Approach 2:
The system uses its own compressed air output to power the control air valves and diverter valve, creating a self-regulating system that automatically manages flow path switching without external control
Data Source
AI summary
An air dryer includes first and second flow paths. Each flow path includes a check valve that prevents fluid flow into the flow path and an exhaust valve having an open position that permits fluid flow out of the flow path and a shut position that prevents fluid flow out of the flow path. A diverter valve has a first position that provides fluid communication to the first flow path and a second position that provides fluid communication to the second flow path. An interlock operably connected to the diverter valve and the exhaust valves prevents positioning the diverter valve to the first position when the exhaust valve in the first flow path is in the open position and prevents positioning the diverter valve to the second position when the exhaust valve in the second flow path is in the open position.