Rotary Valve Channel Geometry for Faster Low-Volume Flushing
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Solution Overview
Problem
Rotary valves in laboratory automation systems face challenges with long flushing times and large flushing volumes, which impact throughput and reagent efficiency, as existing designs do not effectively minimize cross-contamination and optimize fluid flow.
Innovation Solution
A rotary valve design featuring a stator member with planar, parallel faces and a rotatable rotor member, where the rotor channel intersects stator channels at an angle, reducing the fluid path length and promoting laminar flow through transverse and inclined channel sections, thereby decreasing flushing time and volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional rotary valve designs are used, then the valve can distribute liquids effectively, but the flushing time becomes excessively long
Solution Approach 1:
The patent introduces a transverse channel section that runs perpendicular to the stator face, creating a three-dimensional fluid path instead of a planar one. This dimensional change allows the fluid to exit the stator channel more directly, reducing the flushing time required to clear the valve of previous liquids.
Solution Approach 2:
The rotor channel is designed with a curved bottom that is inclined relative to the rotor face, creating a streamlined path that promotes laminar flow. This curvature optimization reduces turbulence and dead zones, enabling faster and more complete flushing of the valve.
2Loss of substance
If conventional rotary valve designs are used, then the valve can distribute liquids effectively, but the flushing volume becomes excessively large
Solution Approach 1:
The transverse channel section creates a direct three-dimensional exit path from the stator channel, eliminating the need for large volumes of flushing liquid to clear horizontal dead zones. This dimensional redesign reduces the flushing volume while maintaining effective cross-contamination prevention.
Solution Approach 2:
The curved bottom of the rotor channel with its inclined design eliminates flow stagnation areas and dead zones where previous liquids could remain. This streamlined geometry ensures complete liquid replacement with minimal flushing volume, preventing cross-contamination efficiently.
3Length of moving object
If the rotor channel intersects stator channels at an angle, then the fluid path length is reduced and laminar flow is promoted, but the manufacturing complexity increases
Solution Approach 1:
The curved bottom of the rotor channel is designed with a specific inclination angle relative to the rotor face, creating an optimized flow path that reduces length and promotes laminar flow. While curved features add manufacturing complexity, the consistent angular design allows for standardized fabrication processes.
Solution Approach 2:
The patent specifies particular angular relationships between the rotor channel bottom inclination and the rotor face, as well as between the transverse channel section and the stator face. These parameter optimizations reduce fluid path length and improve flow characteristics, with the added benefit that once parameters are set, manufacturing becomes more predictable and repeatable.
Data Source
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AI summary
A rotary valve (10) comprises a stator member (36) with a planar stator face, the stator member (36) having a plurality of stator channels (46, 48) for conducting a fluid; and a rotor member (24) with a planar rotor face (52) facing and in contact with the stator face, the rotor member (24) having a rotor channel (50); wherein the rotor member (24) is rotatable with respect to the stator member (36) about a rotation axis (A), such that in a conducting position, the rotor channel (50) interconnects two of the stator channels (46, 48) and the two stator channels (46, 48) are in fluid communication; wherein at least one of the stator channels (48) has a transverse channel section (74) opening into the stator face (54) and running transversely with respect to the rotation axis (A); wherein the rotor channel (50) has a bottom (64), which at an intersection end (62) of the rotor channel (50) is inclined with respect to the rotation axis (A), such that the rotor channel (50) elongates an inner surface of the stator channel (48), when the rotor member (24) is in the conducting position.