Tangential Nozzle Design for Fluid Jet Mill Grinding Chamber
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Solution Overview
Problem
Fluid jet mills experience inefficiencies due to material accumulation on the radially outer periphery of the grinding chamber and rapid nozzle wear, leading to reduced performance and increased maintenance needs.
Innovation Solution
The grinding chamber is designed with nozzles that face a wall portion substantially perpendicular to the nozzle axis, creating a saw tooth profile to minimize material accumulation and reduce nozzle protrusion, thereby enhancing efficiency and reducing maintenance requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nozzles are mounted in holes that protrude into the chamber to create the vortex, then the grinding chamber can effectively pulverize powder material, but points or zones of stagnation are created where material accumulates and nozzle wear increases
Solution Approach 1:
Instead of having nozzles protrude into the chamber (conventional design), the invention inverts the approach by having nozzles flush with the chamber wall, directing jets tangentially to create the vortex without creating stagnation zones. This inversion eliminates the harmful protrusion while maintaining pulverization efficiency.
Solution Approach 2:
The invention applies local quality by ensuring each nozzle is flush with the chamber wall at its specific location, creating locally optimized flow conditions. Each nozzle jet is directed tangentially to the imaginary circle, creating uniform vortex flow without local stagnation zones that would occur with protruding nozzles.
2Productivity
If nozzles protrude into the chamber to create the vortex, then the grinding chamber can effectively pulverize powder material, but rapid wear of nozzles occurs requiring frequent substitution
Solution Approach 1:
The invention inverts the conventional nozzle mounting approach by making nozzles flush with the chamber wall rather than protruding. This inversion protects the nozzle mouths from direct impact with powder material, significantly reducing wear and extending nozzle service life while maintaining pulverization efficiency.
Solution Approach 2:
The invention converts the potentially harmful direct impact of material on protruding nozzle mouths into a beneficial arrangement where material flows tangentially along the chamber wall. The flush nozzle design transforms what would be a wear-inducing configuration into a protective one, where the chamber wall itself shields the nozzle mouths from abrasive damage.
3Productivity
If nozzles are arranged tangent to an imaginary circle inside the cylindrical chamber, then a vortex can be created for pulverization, but material settles and accumulates on the radially outer periphery of the grinding chamber
Solution Approach 1:
The invention applies local quality by optimizing the local geometry at each nozzle location - making nozzles flush with the chamber wall and directing jets tangentially. This local optimization ensures uniform velocity distribution throughout the chamber, preventing material settlement on the radially outer periphery while maintaining effective vortex creation for pulverization.
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 reduces material accumulation, enhances the uniformity and directionality of the fluid jet, decreases nozzle wear, and lowers production costs by eliminating the need for frequent part replacements and assembly errors.
Implementation Method 1
The pressurized fluid from the nozzles creates a vortex which converges spirally towards the centre of the chamber
Implementation Method 2
The particles collide with each other and with the wall of the chamber and the impacts cause them to break down into smaller sized particles
Implementation Method 3
The particles collide with each other and with the wall of the chamber and the impacts cause them to break down into smaller sized particles
Data Source
AI summary
This invention relates to a micronizing device for fluid jet mills which presents a containing body (2) internally delimiting a substantially cylindrical grinding chamber (3), a plurality of nozzles (18), each presenting a mouth (22) opening onto a radially internal side wall (8) of the grinding chamber (3), a supply duct (9) for material to be micronized, opening into the grinding chamber (3) and at least one injection duct (12) for pressurized fluid, in fluid communication with said nozzles (18). The nozzles (18) present a pressurized fluid injection direction (X-X) which is tangent to an imaginary circle included inside the grinding chamber (3). The radially internal side wall (8) presents, at each nozzle (18), a first portion (23) which is substantially perpendicular to the injection direction (X-X) of the respective nozzle (18).