HE-MBU Nozzle Assemblies for Uniform Mist Sprays
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Solution Overview
Problem
Traditional swirl cup nozzles produce messy sprays with large, irregular droplets due to poor misting performance, leading to splattering and inefficient atomization, especially at higher pressures, which is undesirable for applications requiring fine mist sprays.
Innovation Solution
The High Efficiency Mechanical Break Up (HE-MBU) nozzle assembly features enhanced swirl inducing structures with offset power nozzle channels and optimized geometry to increase angular velocity and reduce coagulation, producing smaller, uniform droplets by accelerating fluid flow through tapered channels and interaction regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional swirl cup nozzles are used to generate spray patterns, then spray coverage is achieved, but droplet size is large and irregular with poor misting performance
Solution Approach 1:
The nozzle internal flow path is segmented into multiple distinct regions: a swirl induction region with tangential channels, a vortex development region, and a break-up region. This segmentation allows the fluid to progress through controlled stages of swirling and atomization, transforming the coherent liquid stream into fine uniform droplets by breaking it into smaller components progressively
Solution Approach 2:
The nozzle geometry parameters are specifically optimized including tangential channel angles (15-45 degrees), channel cross-sectional areas, and interaction region dimensions. By changing these geometric parameters, the swirl intensity and droplet break-up efficiency are controlled to produce consistent small droplet sizes in the 60-80 μm range, eliminating the large irregular droplets that cause splattering
2Stress or pressure
If higher operating pressures (50-140 psi) are used to improve spray delivery, then spray reach and coverage are enhanced, but droplet coagulation increases and misting performance deteriorates
Solution Approach 1:
The nozzle replaces passive mechanical pressure delivery with active fluid dynamic mechanisms. The tangential channels convert pressure into rotational kinetic energy, creating a vortex that mechanically breaks up droplets. The interaction region between opposing swirl streams creates shear forces that further atomize the liquid, substituting controlled fluid mechanics for simple pressure-driven flow and preventing coagulation even at high pressures
Solution Approach 2:
The opposing swirl streams create oscillating shear forces and turbulent mixing in the interaction region. This mechanical disturbance continuously breaks up forming droplets and prevents coagulation, maintaining fine droplet size distribution even when high operating pressures are applied to the system
3Ease of manufacture
If conventional swirl cup geometry is used, then simple manufacturing is achieved, but spray pattern control and droplet uniformity are poor
Solution Approach 1:
The nozzle employs asymmetric tangential channel positioning and cross-sectional areas to generate controlled rotational flow. The channels are positioned at specific asymmetric angles relative to the nozzle axis, creating a deliberate swirl pattern that rotates in a predetermined direction. This asymmetric geometry provides precise control over spray pattern and droplet uniformity while remaining manufacturable as a single molded piece
Solution Approach 2:
The single-piece molded nozzle structure integrates multiple functions: fluid distribution through tangential channels, swirl induction, vortex development, and droplet break-up all within one component. This universal design achieves complex spray control functionality without requiring assembly of multiple parts, maintaining ease of manufacture while improving spray pattern consistency
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 HE-MBU nozzle effectively generates and maintains small droplets with reduced coagulation, achieving improved atomization and misting performance even at higher pressures, suitable for applications requiring fine mist sprays with droplets of 60-80 μM or less.
Implementation Method 1
accelerating fluid flow through tapered channels
Implementation Method 2
accelerating fluid flow through tapered channels
Implementation Method 3
enhanced swirl inducing structures with offset power nozzle channels to increase angular velocity
Implementation Method 4
offset power nozzle channels... producing a swirling vortex
Implementation Method 5
High Efficiency Mechanical Break Up (HE-MBU) nozzle assembly... mechanical break up for generating mist sprays
Implementation Method 6
interaction region... accelerating fluid flow through tapered channels and interaction regions
Implementation Method 7
optimized geometry to increase angular velocity and reduce coagulation
Data Source
AI summary
A spray dispenser is configured to generate a swirled output spray pattern 152 with improved rotating or angular velocity ω and smaller sprayed droplet size. Cup-shaped nozzle member 60 has a cylindrical side wall 62 surrounding a central longitudinal axis 64 and has a circular closed end wall 68 with at least one exit aperture 74 passing through the end wall. At least one enhanced swirl inducing mist generating structure is formed in an inner surface 70 of the end wall, and including a pair of opposed inwardly tapered offset power nozzle channels 80, 82 terminating in an interaction chamber 84 surrounding the exit aperture 74. The power nozzle channels generate opposing offset flows which are aimed to very efficiently generate a vortex of fluid which projects distally from the exit aperture as a swirled spray of small droplets 152 having a rapid angular velocity.