Non-Circular Nozzle Design for Efficient Heating Systems
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Summary
Problems
Existing reflow soldering apparatuses face challenges in achieving high heating efficiency while minimizing fan motor output, leading to increased power consumption and reduced motor lifespan due to the need for multiple hot blast heaters and high fan motor output.
Innovation solutions
A nozzle with a non-circular planar outlet shape featuring a projection portion projected inwardly, which changes the gas shape in cross-section as it is blown, enhancing heat transfer rates and allowing for improved heating capacity without increasing fan motor output.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If multiple blast ports and recovery ports are used to uniformly heat objects, then heating uniformity is improved, but device complexity and power consumption increase
Why choose this principle:
The outlet is divided into multiple aperture units arranged in an array, where each aperture unit contains multiple apertures. This segmentation allows the hot blast to be distributed across multiple directions, achieving uniform heating of the object surface without requiring complex multiple blast ports and recovery ports.
Principle concept:
If multiple blast ports and recovery ports are used to uniformly heat objects, then heating uniformity is improved, but device complexity and power consumption increase
Why choose this principle:
Each aperture unit is configured with multiple apertures that blow hot blast in different directions, creating locally optimized heating patterns. The array of aperture units collectively provides uniform heating across the entire object surface, improving heating uniformity while simplifying the overall device structure.
Application Domain
Data Source
AI summary:
A nozzle with a non-circular planar outlet shape featuring a projection portion projected inwardly, which changes the gas shape in cross-section as it is blown, enhancing heat transfer rates and allowing for improved heating capacity without increasing fan motor output.
Abstract
To achieve an improvement of heat exchanger effectiveness (heat transfer rate) without any increase of a fan motor output. The gas heated by the heating units or the gas cooled down by the cooling units is sent to the blowing nozzles 2 by a fan. Then, the blowing nozzles 2 blow the gas sent by the fan through their outlets. Each of the outlets has a non-circular planar shape with a projection portion thereof being projected inwardly. This allows a shape of the gas in cross section perpendicular to a direction where the gas is blown through the outlet of each of the blowing nozzles 2 to be changed by the projection portion with time (switching phenomenon). Such a switching phenomenon enables to be increased the heat exchanger effectiveness (heat transfer rate) on the printed board even if any output of the fan motor for rotating the fan does not increase.