Gas-Liquid Two-Phase Flow Atomizing Nozzle for Pesticide Drift Control
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Solution Overview
Problem
Current gas-liquid two-phase flow atomizing nozzles used in pesticide spraying have issues with small droplet size leading to drifting, loss, and phytotoxicity, and lack design methods for controlling droplet size and spray flow rate, with existing technologies failing to establish relational expressions between droplet size, flow rate, and nozzle geometrical parameters.
Innovation Solution
A gas-liquid two-phase flow atomizing nozzle with an axisymmetric structure that uses atmospheric pressure to mix air with liquid, producing large droplets with a small spray flow rate, and provides design formulas for nozzle dimensions to control droplet size and flow rate, reducing pesticide usage and improving adhesion and anti-drifting performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gas-liquid two-phase flow atomizing nozzles are designed to enhance atomizing effect with small droplet size, then atomization quality is improved, but pesticide drifting and loss increase
Solution Approach 1:
The patent changes the key parameter of droplet size from small to large (volume median diameter ≥300μm) by modifying the nozzle internal structure, specifically the jet flow section dimensions and air inlet hole configurations. This parameter change fundamentally alters the atomization outcome to produce larger droplets that resist drifting while maintaining effective spray coverage
Solution Approach 2:
The patent inverts the conventional design philosophy by suppressing atomization effect rather than enhancing it. Instead of creating fine mist for broad coverage, the design produces large droplets that fall directly onto plant surfaces, inverting the traditional approach to achieve both reduced drifting and effective pesticide delivery
2Object-generated harmful factors
If nozzles are designed with large droplet size to reduce drifting, then anti-drifting performance is improved, but spray flow rate control precision deteriorates
Solution Approach 1:
The patent incorporates feedback mechanisms through the interaction between liquid flow and air entrainment in the jet flow section. The air inlet holes are strategically positioned to create a feedback loop where air pressure and liquid flow rate self-regulate, maintaining stable large droplet formation and consistent spray flow rate without requiring complex external control systems
Solution Approach 2:
The patent utilizes pneumatic-hydraulic interaction by introducing air through inlet holes into the liquid jet flow section. This gas-liquid two-phase flow mechanism hydraulically controls droplet formation while pneumatically assisting in droplet ejection, achieving precise spray flow rate control with large droplet size through fluid dynamic interactions rather than mechanical control
3Device complexity
If internal mix nozzle structure is simplified to reduce system complexity, then device complexity is reduced, but droplet size control capability deteriorates
Solution Approach 1:
The patent applies self-service principle by designing the nozzle internal structure to automatically achieve the desired gas-liquid mixing and large droplet formation without external assistance. The jet flow section and air inlet holes are configured to self-regulate the mixing process, and the outlet section automatically produces the target droplet size range through its geometric design, eliminating the need for external pressurizing devices or complex control systems
Solution Approach 2:
The patent extracts and removes the external pressurizing and atomizing devices from the system, retaining only the essential internal mix nozzle structure. By taking out the complex external equipment, the patent simplifies the overall system while the extracted core nozzle components are optimized to independently achieve precise droplet size control through carefully designed internal geometries
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 nozzle effectively reduces pesticide usage, improves adhesion, and reduces drifting by producing larger droplets with a small spray flow rate, while providing a design framework for precise control of droplet size and nozzle structure.
Implementation Method 1
liquid flows at high speed in the jet flow section of the nozzle to cause a significant pressure drop so that a pressure difference is formed between the external atmospheric pressure and the liquid pressure inside the jet flow section
Implementation Method 2
pressure difference is formed between the external atmospheric pressure and the liquid pressure inside the jet flow section
Implementation Method 3
air flows through the sleeve air inlet hole of the nozzle, the air inlet buffering chamber and the nozzle core air inlet hole and enters the jet flow section to mix with the liquid inside the jet flow section, and the gas-liquid two-phase flow is finally pressure-atomized
Implementation Method 4
the gas-liquid two-phase flow is finally pressure-atomized by the atomizing-body outlet
Data Source
AI summary
A gas-liquid two-phase flow atomizing nozzle includes a nozzle core, an outer sleeve, and an atomizing body. An inner cavity of the nozzle core consists of an inlet tapered section, a jet flow section, and an outlet diffusion section. The outlet diffusion section of the nozzle core is connected to an atomizing body mixing chamber. The jet flow section of the nozzle core is in communication with external atmosphere through a core air inlet hole, an air inlet buffering chamber, and a sleeve air inlet hole.