Microfluidic Valve With Suction Actuator and Spring Return
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing microfluidic systems with pneumatic actuators face high energy consumption, wear, complexity in preparation, and instability in membrane positioning and coupling, leading to inefficiencies and increased costs.
Innovation Solution
A microfluidic system with a valve mechanism using a support wall, a covering wall, and a spacer element made from photoresist material, featuring an elastic closing element and a suction system actuator that allows for efficient fluid transfer without constant actuator activation, utilizing a unique geometry for stable coupling and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pneumatic actuator is used to control the valve, then the valve can be opened and closed, but the actuator must always be active causing high energy consumption and wear
Solution Approach 1:
The pneumatic actuator operates periodically rather than continuously. It is activated only when valve state changes are required (opening or closing), and remains inactive during resting periods. This periodic operation dramatically reduces energy consumption while maintaining reliable valve control through on-demand actuation.
Solution Approach 2:
The valve system incorporates a spring mechanism that automatically returns the valve to its default closed position when pneumatic pressure is released. This self-service mechanism eliminates the need for continuous actuator engagement, allowing the actuator to remain inactive during normal operation and reducing both energy consumption and mechanical wear.
2Ease of operation
If a pneumatic actuator is used to create both depression and compression, then the valve can be fully controlled, but the actuator becomes complex and expensive
Solution Approach 1:
A spring mechanism serves as an intermediary element between the pneumatic actuator and the valve. The spring provides the compression force to close the valve, while the actuator only needs to create depression to open the valve. This intermediary spring simplifies the actuator requirements and reduces overall system complexity while maintaining full valve control capability.
Solution Approach 2:
Instead of using the actuator to actively close the valve (compression), the system inverts the approach by using the actuator to actively open the valve (depression) while relying on passive spring force for closing. This inversion simplifies the actuator design and reduces complexity while preserving complete valve control functionality.
3Reliability
If the membrane is selectively connected to the wall of the channel, then the valve can function, but the preparation becomes complex
Solution Approach 1:
The membrane is integrated and merged with the partition structure, forming a unified component rather than separate elements requiring selective connection. This merging of the membrane with the partition wall simplifies the manufacturing process and preparation steps while maintaining the valve's functional integrity and reliability.
4Ease of operation
If the membrane is positioned in the channel, then the valve can operate, but maintaining correct position and effective coupling is difficult
Solution Approach 1:
The membrane is merged with the partition structure, creating a stable, integrated assembly. This merging ensures correct membrane positioning and effective coupling are maintained throughout operation, eliminating the instability and positioning difficulties associated with separate membrane and partition components.
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 system reduces energy consumption, simplifies implementation, and enhances the stability and effectiveness of fluid transfer by allowing the actuator to be inactive in resting conditions while maintaining a secure fluid-tight coupling, thus overcoming the drawbacks of existing systems.
Implementation Method 1
the actuator comprises a suction system adapted: on one side, to create a depression so as to deform the closing element and, therefore, connect the two segments of channel
Implementation Method 2
The valve further comprises an elastic closing element connected to a wall of the channel in the area of a hole
Data Source
AI summary
A micro-fluidic system comprising a micro-fluidic channel, which has a wall provided with a hole; a closing element, which is partially housed within the hole and has a membrane portion adapted to deform and a side portion sealingly connected with the above mentioned wall; and a partition arranged within the micro-fluidic channel between a first and a second segment; the closing element is deformable between a locked configuration in contact with the partition and an open configuration spaced from the partition; the closing element may be deformed by suction or by a rod or a piston.