Suck-Back Valve Layout for Particle-Free Liquid Handling
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Solution Overview
Problem
Existing suck-back valves allow particles such as impurities to flow into the liquid during the circulation process, leading to defects and inefficiencies in the valve operation.
Innovation Solution
A suck-back valve design where the valve element and diaphragm are molded integrally, with an open-close mechanism and suck-back mechanism that prevent particle contamination by maintaining a closed state and increasing the volume of the valve chamber, reducing the risk of impurities entering the liquid flow paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve element and diaphragm are coupled by screwing in the internal space of the valve body, then the valve can perform suck-back operation to prevent dripping, but particles may flow into the liquid through the coupling part
Solution Approach 1:
The invention extracts the harmful coupling operation (screwing) from the liquid circulation path. By performing the coupling between valve element and diaphragm outside the internal space where liquid circulates, particles generated during coupling cannot contaminate the liquid. The coupling is done in a separate operation space, isolating the contamination source from the liquid flow path.
Solution Approach 2:
The invention segments the valve structure into distinct functional parts: the valve element with its coupling part, the diaphragm, and the internal space where liquid circulates. By designing the coupling part to be engaged from the outside rather than from within the internal space, the patent creates spatial separation between the coupling operation and the liquid circulation path, preventing particle contamination while maintaining suck-back functionality.
2Productivity
If particles enter the liquid flow path, then impurity accumulation occurs reducing liquid replaceability, but allowing free flow path design improves valve operation
Solution Approach 1:
The invention removes the source of impurities (coupling particles) from the liquid flow path by performing coupling operations outside the internal space. This extraction prevents particle generation within the circulation path, thereby maintaining high liquid replaceability without impurity accumulation, resolving the contradiction between productivity and contamination prevention.
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
Prevents particle contamination and improves liquid replaceability by maintaining a closed state and increasing the volume of the valve chamber, effectively preventing dripping and impurity accumulation.
Implementation Method 1
the suck-back mechanism increases the volume of the valve chamber, whereby the liquid in the outlet flow path is sucked
Data Source
AI summary
To prevent a defect in which particles such as impurities flow into a liquid that flows in from an inlet flow path and discharged from an outlet flow path. Provided is a suck-back valve including: a housing part; a valve element part; a diaphragm part; an open-close mechanism that brings the valve element part and a valve seat part into contact or separates the valve element part and the valve seat part from each other to switch between a closed state and an open state; and a suck-back mechanism that moves the diaphragm part in a direction in which the diaphragm part separates from the valve seat part to increase a volume of a valve chamber. The valve element part and the diaphragm part are molded integrally, the open-close mechanism is disposed in an adjacent space, and the valve element part and the open-close mechanism are coupled in the adjacent space.