Shielding Gas Nozzle Flow Layering for Vortex Suppression
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Solution Overview
Problem
Machining devices face challenges in achieving a stable shielding effect due to the formation of circular vortices when shielding gas is blown onto the surface of workpieces, leading to potential oxidation and surface deterioration.
Innovation Solution
A shielding gas ejecting device with a nozzle body featuring an inner, intermediate, and outer shielding gas ejection path, where the flow velocity of the intermediate shielding gas is lower than the inner and outer gases, and the outer gas is configured to circle around the axis, reducing vortex formation and enhancing shielding stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shielding gas is blown onto the surface of the base material to protect it from oxidation, then the shielding effect is improved, but circular vortices are generated causing flow fluctuation and local breakage of the shielding gas layer
Solution Approach 1:
The shielding gas ejection system is divided into multiple independent paths: an inner ejection path, an intermediate ejection path, and an outer ejection path. Each path ejects shielding gas at different flow velocities to form distinct flow layers. The intermediate path specifically ejects gas at a lower flow velocity to suppress vortex formation, while the inner and outer paths maintain higher velocities for effective shielding coverage.
2Area of stationary object
If high flow velocity shielding gas is used to ensure adequate coverage, then the shielding area is improved, but vortex formation increases causing flow fluctuation and shielding layer breakage
Solution Approach 1:
Different regions of the shielding gas ejection system are assigned different flow velocity characteristics. The inner and outer ejection paths use higher flow velocities to ensure adequate shielding area coverage, while the intermediate ejection path uses lower flow velocity specifically at the region where vortices tend to form, thereby maintaining flow stability without compromising overall shielding area.
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 configuration stabilizes the shielding gas flow, reducing the likelihood of breakage and improving machining stability by minimizing vortex formation and enhancing the shielding performance, allowing for more effective protection of the workpiece surface.
Implementation Method 1
a circular vortex is generated by being dragged by the flow of the shielding gas inside this layer. Such circular vortex causes fluctuation in the flow of the shielding gas. As a result, the shielding gas layer is locally or intermittently broken
Data Source
AI summary
A shielding gas ejecting device includes a nozzle body extending along an axis, an inner shielding gas ejection path provided inside the nozzle body and opened on the axis, an outer shielding gas ejection path surrounding the inner shielding gas ejection path from a periphery, and an intermediate shielding gas ejection path provided between the inner shielding gas ejection path and the outer shielding gas ejection path. A flow velocity of an intermediate shielding gas ejected from the intermediate shielding gas ejection path is lower than a flow velocity of an inner shielding gas ejected from the inner shielding gas ejection path and a flow velocity of an outer shielding gas ejected from the outer shielding gas ejection path.