Spraying Apparatus Noise Reduction via Segmented Gas-Liquid Mixing
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Solution Overview
Problem
Conventional two-fluid nozzles used for atomizing liquids in indoor applications face challenges in reducing noise levels, particularly when the noise value exceeds 70 dB, making them unsuitable for indoor use in humidification and similar applications.
Innovation Solution
The spraying apparatus incorporates a gas-liquid mixer with a conical projection portion and a straightener having an uneven-shaped opening, which collides and circulates the liquid and gas flows to atomize the liquid effectively, while a tapered flow passage and tubular flow passage reduce noise by minimizing turbulent flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional two-fluid nozzle is used to atomize liquid, then atomization performance is improved, but noise level increases beyond acceptable indoor limits
Solution Approach 1:
The gas-liquid mixing process is divided into multiple stages: initial collision zone, circulation zone along annular portion, and straightening zone. This segmentation allows progressive atomization while controlling turbulence and noise at each stage separately.
Solution Approach 2:
The annular portion and curved flow paths guide the gas-liquid mixed fluid to circulate smoothly around the inner surface, reducing turbulent eddies and noise generation while maintaining atomization effectiveness.
2Manufacturing precision
If gas and liquid flows are introduced to collide and atomize, then liquid particle diameter is reduced, but turbulent flow increases causing noise
Solution Approach 1:
Different regions of the gas-liquid mixer provide different functions: the collision zone creates intense mixing for atomization, while the annular circulation zone provides smooth flow guidance, and the straightening region eliminates turbulence before discharge.
Solution Approach 2:
The annular portion acts as an intermediary structure that receives the gas-liquid mixed fluid and guides it through a controlled circulation path, transitioning from turbulent mixing to laminar flow before reaching the discharge opening.
3Object-generated harmful factors
If a straightener with uneven-shaped opening is added, then noise is reduced, but device complexity increases
Solution Approach 1:
The straightener function is merged with the discharge structure by forming the uneven-shaped opening directly in the flow passage having a taper, eliminating the need for a separate straightener component while achieving noise reduction.
Solution Approach 2:
The flow passage having a taper serves multiple functions: it provides flow direction, acts as a straightener through its uneven-shaped opening, and controls the discharge of atomized liquid, reducing the need for additional components.
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 configuration allows for the efficient atomization of liquids into small particle diameters (≤10 μm) with reduced noise levels (≤70 dB), enabling the apparatus to be used in indoor settings without excessive noise disturbance.
Implementation Method 1
A gas flow is introduced from a surface opposite thereto to collide with the liquid flow
Implementation Method 2
atomizes a liquid using a gas
Implementation Method 3
A gas-liquid mixed fluid flow advances to spout portion 316 while circulating around an inner surface of annular portion 324
Implementation Method 4
a tapered flow passage and tubular flow passage reduce noise by minimizing turbulent flow
Implementation Method 5
The straightener has an opening having an uneven shape provided in the flow passage having a taper
Data Source
AI summary
A spraying apparatus includes a spraying apparatus main body, a liquid introduction portion, a gas introduction portion, a gas-liquid spout portion, a liquid inlet, a gas inlet, a tubular flow passage, a spout, a flow passage having a taper, a straightener, and a projection portion. The liquid inlet allows a liquid flow to enter a gas-liquid mixer which is a space inside the annular gas introduction portion. The gas inlet allows a gas flow to enter the gas-liquid mixer. The straightener has an opening having an uneven shape provided in the flow passage having the taper. The projection portion is provided in the liquid introduction portion, protrudes to the gas-liquid mixer, and forms the straightener and a straightening outlet.