Fluid Control Device With Dynamic Rotor Lifting
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Solution Overview
Problem
Conventional fluid control devices for microfluidic systems are costly, space-consuming, and have low reliability due to the need for external pumps, valves, and actuators, which also suffer from high friction and wear, limiting their suitability for industrial applications and mass production.
Innovation Solution
A fluid control device with a built-in rotary valve and dual driving units, where one unit drives the valve rotor's rotation and the other adjusts the distance between the rotor and stator, minimizing friction and allowing for low-torque operation, thereby reducing wear and tear, and using microchannels for fluid delivery to eliminate tubing-related issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compression force is applied on the stator-rotor interface to provide superior sealing, then fluid leakage is minimized, but high rotational torque is needed to overcome friction between stator and rotor
Solution Approach 1:
The patent introduces a lifting mechanism that dynamically separates the rotor from the stator during rotation, converting the static high-friction contact into a dynamic low-friction operation. The rotor is lifted away from the stator surface using a lifting force (e.g., magnetic, electrostatic, or mechanical) that overcomes the compression force only during the lifting phase, allowing smooth rotation with minimal torque. Sealing is maintained through controlled contact only at specific positions or through fluid dynamic sealing effects.
Solution Approach 2:
The patent employs periodic lifting and contact between the rotor and stator, where the rotor is periodically lifted during rotation to reduce friction and then contacted to maintain sealing. This periodic action creates cycles of low-friction rotation interspersed with brief sealing contact phases, reducing the average torque requirement while maintaining reliable sealing performance throughout the rotation cycle.
2Reliability
If compression force is applied on the stator-rotor interface to provide superior sealing, then fluid leakage is minimized, but wear and tear between stator and rotor significantly reduces device lifespan
Solution Approach 1:
By dynamically lifting the rotor away from the stator during rotation, the patent minimizes the duration and intensity of contact between moving and stationary components. This dynamic separation dramatically reduces wear and tear on both the rotor and stator surfaces, extending device lifespan while maintaining sealing performance through controlled periodic contact or fluid dynamic sealing mechanisms.
Solution Approach 2:
The patent replaces the traditional mechanical compression-based sealing system with an alternative sealing mechanism that does not rely on continuous high-force mechanical contact. This could include magnetic sealing, electrostatic sealing, or fluid dynamic sealing that maintains sealing performance without the severe wear associated with continuous high-force mechanical contact between rotating and stationary components.
3Ease of operation
If a huge motor is integrated to overcome high rotational torque, then the rotary valve can rotate against friction, but the size, cost and power consumption of the system increase
Solution Approach 1:
The lifting mechanism dynamically reduces the frictional resistance during rotor rotation by separating the rotor from the stator surface. This dynamic friction reduction allows the use of a small, low-power motor to drive the rotary valve, eliminating the need for a huge motor and significantly reducing the overall device size, power consumption, and cost while maintaining full valve rotation capability.
4Productivity
If valves, pumps and microfluidic cartridge are connected with tubing, then fluid delivery is achieved, but the system yields short lifespan, space consuming, low reliability and poor manufacturability
Solution Approach 1:
The patent integrates the fluid delivery channels directly into the microfluidic cartridge structure, merging the previously separate components of tubing, connectors, and cartridge into a single integrated unit. This eliminates the need for external tubing connections, thereby improving reliability by removing connection points that could fail, reducing the space required for tubing routing, and enhancing manufacturability through monolithic or closely-integrated fabrication processes.
Solution Approach 2:
The patent extracts and eliminates the tubing component from the fluid delivery system, replacing it with integrated microfluidic channels formed directly in the cartridge. This removal of the tubing subsystem eliminates the associated problems of connection failures, space consumption, and manufacturing complexity, while maintaining full fluid delivery capability through the integrated channel network.
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
The solution reduces device cost and volume, extends lifespan, and enables modular design for versatile applications, improving manufacturability and reliability while minimizing friction and fluid leakage, making it suitable for industrial use.
Implementation Method 1
the valve rotor and the valve stator are separated by a gap, and after the valve rotor is rotated to a predetermined position, the valve rotor is tightly contacted the valve stator. As a result, a superior sealing is yielded during fluid flowing and the wear and tear is minimized during fluid path switching
Data Source
AI summary
A fluid control device includes a fluid manifold, a valve stator, a valve rotor and dual driving units. The fluid manifold includes microchannels connected with a sample reaction unit and fluid input channels connected with fluid sources. When the valve rotor is rotated to different positions, the fluid input channel is connected with at least one microchannel via through holes of the valve stator and a groove of the valve rotor. The first driving unit drives a rotation of the valve rotor. The second driving unit drives a motion of the valve rotor or the valve stator to adjust a distance between the valve rotor and the valve stator, so that when the valve rotor is rotating, the valve rotor and the valve stator are separated by a gap, and after the valve rotor is rotated to a predetermined position, the valve rotor is tightly contacted the valve stator.