Infusion Valve Sealing Portion Rotation Isolation
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Solution Overview
Problem
The existing drain valve in infusion devices for liquid chromatography suffers from premature wear due to rotation-induced abrasion, leading to reduced sealing effectiveness and increased maintenance complexity, as the sealing portion is not properly separated from the shaft during operation, causing potential operational issues and difficulty in maintenance.
Innovation Solution
A valve design where the sealing portion and shaft portion are rotatably fastened with a screw mechanism, ensuring a fixed position relationship and degree of freedom in rotation, preventing the sealing ring from rotating and remaining inside the main body, thus reducing wear and simplifying maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing portion is integrated with the shaft and rotates together, then the valve body can be pressed against the flow inlet to enhance tightness, but the sealing ring undergoes rotation-induced abrasion that shortens its lifespan
Solution Approach 1:
The valve is divided into two independent rotatable parts: the shaft portion and the sealing portion. The shaft portion rotates to control valve opening/closing, while the sealing portion remains stationary relative to the shaft rotation, eliminating rotation-induced abrasion on the sealing ring while maintaining sealing tightness through the pressing mechanism.
Solution Approach 2:
The sealing portion is extracted from the rotating shaft and made independently rotatable. This separates the sealing function from the rotation function, allowing the shaft to rotate without causing abrasion to the sealing ring, while the sealing portion can still be pressed against the flow inlet for tight sealing.
2Duration of action of stationary object
If the sealing portion is separated from the shaft, then rotation-induced abrasion is reduced, but the sealing portion may remain inside the main body causing operational issues
Solution Approach 1:
The sealing portion is made dynamically independent from the shaft, allowing it to be rotatably coupled rather than fixed. This enables the sealing portion to move independently and be properly positioned during operation, preventing it from remaining inside the main body while still reducing rotation-induced abrasion.
Solution Approach 2:
The rotatable coupling is designed to preliminarily position the sealing portion in the correct location before operation. This ensures that the sealing portion is properly oriented and positioned to prevent operational abnormalities, while still allowing it to be separated from the shaft's rotation path.
3Reliability
If a complex mechanism is used to prevent sealing portion rotation, then sealing effectiveness is maintained, but device complexity and maintenance difficulty increase
Solution Approach 1:
Instead of trying to prevent the sealing portion from rotating through complex constraints, the design inverts the approach by making the sealing portion independently rotatable. This simple inversion eliminates the need for complex anti-rotation mechanisms while maintaining sealing effectiveness through the pressing mechanism.
Solution Approach 2:
The rotatable coupling serves multiple functions: it allows the sealing portion to be independently positioned, prevents rotation-induced abrasion, and simplifies the overall mechanism. This multi-functionality eliminates the need for separate complex mechanisms to achieve each individual goal.
Data Source
AI summary
Operability and lifespan of a drain valve of an operated infusion device are improved when changing the composition of a transported solution or releasing the pressure. A sealing portion and a shaft portion of the valve are constructed to be separated from each other. The shaft portion is disposed with a through hole having a step. A screw passes through the through hole, such that a screw portion of the screw is screwed to the sealing portion, and on the other hand, a screw head is fastened to the step portion of the through hole of the shaft portion. The sealing portion and the shaft portion can ensure a degree of freedom of rotation while maintaining a fixed position relationship there-between, thereby preventing the sealing portion from falling off and prolonging the lifespan of a valve body.