Blasting Discharge Jet Nozzle with Cylindrical Section
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Solution Overview
Problem
Existing dry ice blasting agent discharge nozzles suffer from uneven particle acceleration and jet pattern issues due to converging and diverging sections, leading to unsatisfactory surface cleaning performance.
Innovation Solution
Incorporating a cylindrical section of at least 20 mm length within the nozzle to ensure uniform carrier air flow and stabilization of the blasting agent flow, along with a section that diverges in flow direction, and allowing for modular assembly and adjustment of nozzle components for customizable impact pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a converging inlet section is followed by a narrowest cross-section and a diverging section, then the nozzle can discharge the blasting agent mixture, but the particles receive uneven acceleration and the jet pattern is unsatisfactory
Solution Approach 1:
The nozzle is divided into distinct functional sections: a converging inlet section, a cylindrical section with constant cross-section, and a diverging outlet section. This segmentation allows each section to perform its specific function - the cylindrical section provides uniform acceleration and stabilization of the particle flow, while the converging and diverging sections manage the flow transition and discharge pattern.
Solution Approach 2:
The nozzle geometry parameters are optimized, specifically the length of the cylindrical section (at least 20 mm) and the ratio between the diverging section length and cylindrical section length (at most 4:1). These parameter changes ensure uniform acceleration of particles and stable jet pattern, directly addressing the problem of uneven acceleration while maintaining discharge capability.
2Manufacturing precision
If the cylindrical section length is increased to ensure uniform acceleration, then the jet pattern improves, but the nozzle length and complexity increase
Solution Approach 1:
The cylindrical section length is specified to be at least 20 mm to ensure sufficient uniform acceleration, while the overall nozzle length is controlled by limiting the diverging section length to at most 4 times the cylindrical section length. This parameter optimization achieves jet pattern uniformity without excessive increase in nozzle complexity or length.
3Adaptability or versatility
If the nozzle is constructed in modular sections for versatility, then adaptability improves, but manufacturing cost and assembly complexity increase
Solution Approach 1:
The nozzle is designed as a modular assembly with a first subassembly containing the cylindrical section and diverging section, and a second subassembly containing the converging inlet section. This segmentation allows different combinations and configurations of the same basic components, providing versatility for different applications while using standardized manufacturing processes to control costs.
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 results in a more even and intensive cleaning of surfaces with improved jet pattern and surface cleaning performance, especially when using dry ice particles, and allows for cost-effective and versatile nozzle configurations.
Implementation Method 1
the particles are carried over a minimum length within the blasting agent discharge nozzle on a carrier air flow that is directed in the same direction in the cylindrical section and are therefore accelerated uniformly over this minimum distance
Implementation Method 2
The surface to be cleaned is therefore subjected to a more even impact pressure by the particles after exiting the nozzle
Implementation Method 3
damage is caused immediately after they hit the surface due to the soft nature of the particles and the dissolving of the ice crystals in the atmosphere
Data Source
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AI summary
The nozzle has an inflow section (1) converging in a flow direction, and a transverse section (2), a cylindrical section (4) and a section (5) with a transverse surface attached to the inflow section consecutively, where the surface increases in the direction. The length of the cylindrical section is 20 millimeter, and a conveying section (3) diverging in the direction is attached to the transverse section in-front of the cylindrical section. A ratio of lengths between the section (5) and the cylindrical section is 4:1.