Floating Reservoir Fluid Delivery System for Stable Flow Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for delivering fluids to microdevices are inadequate for controlling large numbers of fluids and maintaining constant flow rates, as syringe pumps are expensive and prone to oscillations, integrated reservoirs have limited volume and variable flow rates, and horizontal reservoirs have limited capacity and flow rate stability.
Innovation Solution
A fluid delivery system where a reservoir containing the fluid to be transferred floats in a secondary fluid, with a flow conduit submerged in the reservoir, maintaining consistent orientation and using pressure differentials to achieve stable flow rates, reducing hydrostatic pressure changes and improving flow stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If syringe pumps are used to deliver fluids, then flow rate control is achieved, but the system becomes expensive and bulky with oscillations at low flow rates
Solution Approach 1:
The patent extracts the fluid delivery function from complex external pumps and integrates it into a simple reservoir system where fluid delivery is driven by buoyancy and gravity. The reservoir itself becomes the delivery mechanism, eliminating the need for expensive pump equipment while maintaining flow control through geometric design of the reservoir and outlet positioning.
Solution Approach 2:
The reservoir system is designed to be self-regulating, where the floating reservoir automatically adjusts its position and maintains consistent flow rates without external control mechanisms. The system uses its own buoyancy and gravitational properties to regulate fluid delivery, eliminating the need for complex electronic controls and feedback systems.
2Ease of operation
If integrated reservoirs are used, then fluid delivery is simplified, but flow rate varies as reservoirs drain and volume is limited
Solution Approach 1:
The reservoir is designed to dynamically adjust its vertical position as fluid is delivered. The floating mechanism allows the reservoir to rise automatically as fluid volume decreases, maintaining a constant height difference between the outlet and the fluid surface. This dynamic adjustment ensures stable flow rates throughout the entire delivery process, from full to empty reservoir.
Solution Approach 2:
The patent introduces vertical movement as an additional degree of freedom for the reservoir. Instead of a fixed-position reservoir, the floating design allows vertical translation that compensates for fluid volume changes. This dimensional change transforms a static system with variable flow into a dynamic system with constant flow.
3Quantity of substance
If horizontal reservoirs are used, then fluid capacity is increased, but flow rate stability deteriorates
Solution Approach 1:
The floating vertical reservoir design maintains a constant gravitational potential difference between the fluid surface and the outlet throughout delivery. By keeping the outlet at a fixed height below the fluid surface and allowing the reservoir to float, the system maintains equipotential conditions that ensure stable flow rates regardless of the total fluid capacity or reservoir orientation.
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 achieves significantly more stable and uniform flow rates, with improvements of up to nine-fold compared to nonfloating systems, maintaining consistent flow over large volumes and long periods with minimal deceleration.
Implementation Method 1
The reservoir containing the first fluid is floating in the second fluid
Implementation Method 2
Upon establishing a sufficient pressure differential across the inlet and outlet ends of the flow conduit, flow of the first fluid within the conduit is induced
Data Source
AI summary
A fluid delivery system is described which provides stable flow rates over a range of different flow rates and while multiple fluids are being concurrently delivered. The delivery system includes one or more reservoirs each containing a respective fluid to be transferred. The reservoir(s) are positioned within a secondary fluid selected such that the reservoir(s) and their contents, i.e. the fluids to be transferred, float within the secondary fluid. One end of a flow conduit is submerged in each fluid to be transferred. A pressure differential is then induced in the flow conduit whereby fluid flow therein occurs.