Liquid Ejection Device Nozzle Spacing for Droplet Impact Force
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Solution Overview
Problem
Liquid ejection devices that form continuous flows into droplets often accumulate liquid on objects, leading to reduced collision force due to the formation of a liquid film, especially when the number of nozzle holes is increased, resulting in ineffective distribution and impact on the object.
Innovation Solution
A liquid ejection device with multiple rows of nozzle holes arranged at specific distances to increase the ejection area and prevent liquid film formation, where the distance between nozzle rows is at least twice the distance between individual nozzle holes, and the nozzle holes are oriented to maximize the ejection surface area while minimizing the impact force by distributing the liquid across a broader area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of nozzle holes is increased to increase the ejection area, then the ejection area is improved, but liquid accumulates and forms a liquid film reducing collision force
Solution Approach 1:
The nozzle holes are segmented into multiple rows with different spacing arrangements. First nozzle rows have smaller spacing between adjacent holes, while second nozzle rows have larger spacing, creating distinct ejection zones that prevent liquid accumulation and maintain collision effectiveness.
Solution Approach 2:
Different regions of the ejection surface have different nozzle hole densities and spacing characteristics. The first nozzle rows provide higher density for broader coverage, while the second nozzle rows provide lower density to prevent liquid film formation, creating local variations in ejection quality.
2Area of stationary object
If the number of nozzle holes is increased to increase the ejection area, then the ejection area is improved, but the liquid distribution uniformity deteriorates
Solution Approach 1:
The nozzle array is segmented into first and second nozzle rows with different spacing patterns. This segmentation allows the system to cover a larger area while maintaining uniform liquid distribution through the complementary spacing arrangements that prevent overlapping liquid streams.
Solution Approach 2:
The nozzle rows are arranged asymmetrically with different spacing intervals. The first nozzle rows have one spacing pattern while the second nozzle rows have a different spacing pattern, creating an asymmetric distribution that optimizes both coverage area and liquid distribution uniformity.
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 solution effectively suppresses the formation of liquid films and maintains a higher impact force of droplets on the object by ensuring that the liquid is released across a larger area, enhancing the efficiency of liquid distribution and collision force, particularly in applications like cleansing and medical procedures.
Implementation Method 1
an ejector configured to eject a liquid in a continuous flow from an ejection surface of the ejector, form the continuous flow into droplets, and cause a collision with an object in a form of the droplets
Data Source
AI summary
A liquid ejection device includes an ejector configured to eject a liquid in a continuous flow from an ejection surface of the ejector, form the continuous flow into droplets, and cause a collision with an object in a form of the droplets, wherein, in the ejection surface, a plurality of first nozzle rows each including a plurality of first nozzle holes for ejecting the liquid arranged at first distances in a nozzle hole arrangement direction are arranged, the plurality of first nozzle rows is arranged at second distances in a nozzle row arrangement direction crossing the nozzle hole arrangement direction, and the second distance is equal to or more than twice the first distance.