Capillary Fluid Dispensing Device Eliminates Backpressure
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Solution Overview
Problem
Existing fluid dispensing devices are complex, inefficient in dispensing small volumes of fluid, and often rely on external backpressure systems, which complicates their design and reduces their ability to handle larger fluid volumes effectively.
Innovation Solution
A compact and simplified fluid dispensing device that utilizes a fluid ejecting mechanism with a thermoresistive or piezo-electric actuator and a capillary-based fluid supply system, eliminating the need for external backpressure, allowing for precise and reliable dispensing of larger fluid volumes without sacrificing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external backpressure devices are used to retain fluid, then fluid retention is improved, but device complexity increases
Solution Approach 1:
The patent removes the external backpressure device from the system entirely. Instead of using an external mechanism to retain fluid, the invention uses the capillary channels themselves to provide the necessary fluid retention through surface tension forces, thereby simplifying the overall device architecture while maintaining reliable fluid control.
Solution Approach 2:
The capillary channels are designed to automatically retain and control fluid flow through their inherent capillary properties without requiring external assistance. The fluid is retained within the capillary channels by surface tension forces that naturally arise from the channel geometry and fluid properties, eliminating the need for separate backpressure mechanisms.
2Reliability
If external backpressure systems are used, then fluid control is improved, but device size increases
Solution Approach 1:
The patent merges the fluid retention function with the fluid delivery function by integrating the capillary channels to perform both roles. The same capillary structure that delivers fluid to the dispensing point also retains the fluid through its capillary properties, eliminating the need for separate backpressure components and reducing overall device volume.
Solution Approach 2:
The external backpressure device is completely removed from the system. The invention achieves fluid control through the intrinsic properties of the capillary channels alone, significantly reducing the device size while maintaining effective fluid control capability.
3Manufacturing precision
If complex fluid dispensing mechanisms are used, then dispensing precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces complex mechanical fluid control mechanisms with a passive capillary-based system. Instead of using mechanically actuated valves, pumps, or pressure regulators to achieve precise dispensing, the invention relies on the physical properties of capillary action and surface tension to control fluid flow, thereby reducing manufacturing complexity and cost while maintaining dispensing precision.
Solution Approach 2:
The invention achieves dispensing precision by carefully controlling the geometric parameters of the capillary channels (such as diameter, length, and configuration) rather than using complex mechanical adjustment mechanisms. By optimizing these physical parameters, the system achieves precise fluid control through passive capillary forces, simplifying manufacturing while maintaining high precision.
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 device achieves precise and reliable dispensing of small fluid volumes while being more compact and cost-effective, capable of handling larger volumes without external backpressure, enhancing versatility and reducing waste.
Implementation Method 1
a capillary-based fluid supply system
Implementation Method 2
a thermoresistive or piezo-electric actuator
Implementation Method 3
a thermoresistive or piezo-electric actuator
Data Source
AI summary
A fluid dispensing device and method to wick fluid, to be ejected or expelled by a fluid ejecting device, along a capillary slot.