Parallel Jet Nozzle for Cutting Torch Stability
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Solution Overview
Problem
Post-mixing cutting nozzles face challenges in achieving high cutting quality and speed while maintaining structural simplicity and stability, as they often suffer from overheating and pressure loss due to the design of the Laval nozzle opening into the nozzle head.
Innovation Solution
Designing the Laval nozzle opening as a parallel jet nozzle reduces compression shocks and improves mixing of heating gases and oxygen, maintaining structural simplicity and stability, and allowing for efficient cutting with reduced pressure loss and jet purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional Laval nozzle is used in a post-mixing cutting nozzle, then the structure remains simple, but the cutting quality and speed are insufficient due to compression shocks and poor mixing
Solution Approach 1:
The nozzle is divided into distinct functional sections: a parallel jet nozzle section for cutting oxygen delivery and a Laval nozzle section for heating gas compression. This segmentation allows each section to optimize its specific function without compromising the other, improving cutting speed while maintaining structural clarity
Solution Approach 2:
The invention transitions from a conventional single Laval nozzle design to a multi-dimensional configuration where the parallel jet nozzle and Laval nozzle are arranged in specific spatial relationships. The Laval nozzle is positioned to compress heating gases into the parallel jet, creating a three-dimensional mixing zone that enhances cutting performance
2Manufacturing precision
If the Laval nozzle opening is designed to improve mixing, then cutting quality improves, but pressure loss increases due to jet boundary fanning
Solution Approach 1:
The parallel jet nozzle acts as an intermediary element between the heating gas channels and the cutting oxygen stream. It facilitates controlled mixing of heating gases with the cutting oxygen jet while maintaining jet integrity, achieving high cutting quality without excessive pressure loss
Solution Approach 2:
Different sections of the nozzle have specialized functions: the parallel jet section maintains low mixing to preserve jet purity and pressure, while the Laval nozzle section provides localized compression of heating gases. This local differentiation of quality allows optimization of each zone for its specific purpose
3Manufacturing precision
If heating gases are compressed into the parallel jet, then mixing is improved and cutting quality increases, but the nozzle head temperature increases causing stability issues
Solution Approach 1:
The harmful thermal effects are extracted and managed by directing the compressed heating gases primarily into the cutting oxygen jet stream rather than allowing them to concentrate at the nozzle head. The parallel jet configuration disperses thermal energy along the jet path, reducing localized heating at the nozzle head while maintaining mixing benefits
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 enhances cutting quality and speed, maintains nozzle stability, and simplifies manufacturing, resulting in a more efficient and cost-effective cutting nozzle.
Implementation Method 1
a cutting oxygen channel (4) that has a Laval nozzle (5) with a convergent section (6) and a divergent section (7)
Implementation Method 2
Laval nozzle (5) with a convergent section (6) and a divergent section (7)
Implementation Method 3
the Laval nozzle opening into the opening of the nozzle head is designed as a parallel jet nozzle... reduces the risk of a compression shock in the area of the opening
Data Source
Figure 1
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AI summary
A cutting torch and a cutting nozzle (1) having at least one heating-oxygen duct (2), having at least one heating-gas duct (3), having a cutting-oxygen duct (4), which has a de Laval nozzle (5) with a convergent and a divergent section (6, 7), and having a nozzle head (8) are shown, said nozzle head (8) having a clearance (9) into which the heating-oxygen duct (2), the heating-gas duct (3) and the de Laval nozzle (5) of the cutting-oxygen duct (4) lead. In order to create a stable post-mixing cutting nozzle (1) having improved efficiency, it is proposed that the de Laval nozzle (5), leading into the clearance (9) in the nozzle head (8), is in the form of a parallel jet nozzle.