Annular Channel Injection Nozzle for Consistent Mixing
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Solution Overview
Problem
Conventional injection nozzles in agricultural spraying devices face challenges with varying mixing ratios between the liquid suction medium and the carrier liquid due to pressure fluctuations in the carrier liquid, leading to inconsistent performance.
Innovation Solution
The injection nozzle design features an annular channel with a flow connection to the injection chamber, ensuring a constant mixing ratio by distributing the suction medium evenly around the propellant medium jet, and includes a modular orifice plate system for adjusting the mixing ratio, along with a conical injection chamber configuration to maintain uniform mixing despite pressure changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional injection nozzle design is used, then the structure is simple, but the mixing ratio between suction medium and propellant medium varies with pressure fluctuations
Solution Approach 1:
The injection chamber is divided into multiple conical sections with different cone angles (first conical section with smaller angle, second conical section with larger angle). This segmentation allows each section to handle different aspects of the mixing process, ensuring consistent mixing ratio despite pressure fluctuations while maintaining a relatively simple overall structure.
Solution Approach 2:
Different regions of the injection chamber are given different geometric properties - the first conical section has a smaller cone angle for initial mixing, while the second conical section has a larger cone angle for final mixing. This local differentiation optimizes the mixing process at each stage, improving reliability without requiring complex external components.
2Manufacturing precision
If the injection chamber has a single conical section, then the device complexity is low, but the mixing uniformity is insufficient
Solution Approach 1:
The injection chamber is segmented into two conical sections with different cone angles. The first conical section (smaller angle) handles initial mixing, while the second conical section (larger angle) ensures uniform final mixing. This segmentation achieves superior mixing uniformity while keeping the geometry relatively simple and manufacturable.
Solution Approach 2:
The transition from a single conical section to two conical sections with different angles adds a dimensional variation in the mixing process. This geometric differentiation in the conical sections creates multiple stages of mixing, improving uniformity without requiring complex external mixing mechanisms.
3Adaptability or versatility
If pressure fluctuations occur in the propellant medium, then the system adapts automatically, but the mixing ratio becomes inconsistent
Solution Approach 1:
The injection chamber geometry is designed with specific cone angles that create pressure and flow distribution patterns resilient to external pressure fluctuations. The dual-conical geometry naturally adjusts flow patterns, maintaining consistent mixing ratio despite variations in propellant medium pressure, thus achieving both adaptability and reliability.
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
This design ensures a consistent mixing ratio between the propellant and suction media, even with pressure fluctuations, providing a stable and uniform distribution of the suction medium, enhancing the efficiency and reliability of the spraying process in agricultural applications.
Implementation Method 1
A propellant medium jet is generated by a propulsion nozzle which opens into the injection chamber. The propellant medium jet creates a low-pressure zone in the injection chamber, in particular at the liquid suction opening, so that the liquid suction medium is drawn in through the liquid suction opening.
Data Source
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AI summary
The invention relates to an injection nozzle for a spray device for drawing in a liquid suction medium by means of a pressurized liquid propellant medium and for spraying a mixture of the suction medium and the propellant medium, comprising a nozzle housing, an injection chamber arranged in the nozzle housing, a propellant nozzle opening into the injection chamber for generating a jet of propellant medium entering the injection chamber, and a liquid intake opening for the liquid suction medium, wherein the liquid intake opening opens into an annular channel which has a flow connection to the injection chamber.