Induction Ring Spray Nozzle for Localized Droplet Charging
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Solution Overview
Problem
Existing electrostatic sprayer systems require extensive electrical insulation and high voltage components due to pre-charging of liquid feed stock, leading to complex and costly setups.
Innovation Solution
An induction ring-based electrostatic spray nozzle with a controlled electrical circuit that induces charge on droplets post-exit, using a conductive path and insulating barriers to manage voltage differentials and droplet formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid feed stock is charged to high voltage prior to spray discharge, then electrostatic charge is achieved on spray droplets, but extensive electrical insulation and high voltage components are required throughout the entire feedstock path
Solution Approach 1:
The charging function is segmented from the feedstock path. Instead of charging the entire feedstock line, only the spray droplets are charged at the point of discharge using an induction ring, while the feedstock path remains at ground potential with standard components
Solution Approach 2:
The high voltage charging function is extracted from the feedstock path and concentrated at the induction ring location. This removes the need for electrical insulation along the entire feedstock path, as high voltage is present only at the spray discharge point
2Productivity
If pre-charging of liquid feed stock is implemented, then droplet dispersal is improved, but specially configured components are required along the feedstock path
Solution Approach 1:
The system separates the charging function from the feed delivery function. Standard feed delivery components can be used without special electrical configurations, while only the induction ring at the spray point requires high voltage capability
Solution Approach 2:
The induction ring uses the natural conductivity of the liquid feedstock to transfer charge to droplets. The feedstock itself serves as the charge transfer medium, eliminating the need for specially configured pumps, flow meters, or sensors along the feed path
3Device complexity
If induction ring is positioned at nozzle exit aperture, then charging occurs after spray formation, but electrical field potential requires precise control
Solution Approach 1:
The liquid feedstock acts as an intermediary between the induction ring's electrical field and the spray droplets. The conductive liquid transfers charge efficiently from the induction ring to the droplets, providing natural control over the charging process without requiring precise voltage differential adjustments
Solution Approach 2:
The system changes the electrical state parameter from high voltage throughout the feed path to localized high voltage at the induction ring. This parameter change reduces insulation requirements while maintaining effective droplet charging through the conductive liquid medium
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
Facilitates efficient and uniform spray dispersal with reduced voltage requirements, simplifying system design and reducing component complexity while maintaining effective droplet charging.
Implementation Method 1
The induction ring generates an electrical field for inducing an electrical charge on droplets of a feedstock liquid from the fluid tip that pass through an opening of the induction ring
Data Source
AI summary
An electrostatic spray nozzle assembly is described that includes an induction ring and a fluid tip. The induction ring generates an electrical field for inducing an electrical charge on droplets of a feedstock liquid from the fluid tip that pass through an opening of the induction ring. The induction ring is electrically coupled to an electrical induction field source via a first conductive path comprising at least an electrically conductive pliable structure, such as a stainless steel spring. Feedstock flowing through the fluid tip is electrically coupled to a charge carrier source via a second conductive path provided by at least a conductive surface of a fluid tube coupled to the fluid tip. The first conductive path and the second conductive path are electrically isolated by an insulating barrier.