Liquid Ejection Device Vibration Frequency Droplet Diameter
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Solution Overview
Problem
Existing liquid ejection devices face efficiency issues due to the trade-off between increasing impact pressure and reducing nozzle diameter, which affects droplet diameter and operation efficiency, leading to scattered liquid and reduced visibility.
Innovation Solution
A liquid ejection device with a vibration generation unit that applies vibration to the liquid, optimizing the drive frequency to equal or less than the droplet frequency, increasing the droplet diameter without altering the nozzle diameter, thereby enhancing operation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the ejection flow rate is increased to increase impact pressure, then the impact pressure is improved, but a large amount of liquid is scattered, visibility deteriorates, and operation efficiency is reduced
Solution Approach 1:
The patent applies vibration to the liquid in the liquid transfer tube before ejection, causing the liquid to be ejected as larger droplets rather than fine spray. This vibration mechanism allows achieving high impact pressure with reduced liquid scattering and improved visibility, resolving the contradiction between impact pressure and harmful scattering effects
Solution Approach 2:
The patent changes the physical state parameters of the liquid by applying vibration at specific frequencies, transforming the liquid from a continuous flow into discrete droplets of controlled size. This parameter change enables high impact pressure while controlling droplet diameter to prevent excessive scattering
2Stress or pressure
If the nozzle diameter is reduced to increase impact pressure, then the impact pressure is improved, but the droplet diameter is reduced accordingly, and operation efficiency cannot be sufficiently increased
Solution Approach 1:
The vibration generation unit applies vibration to the liquid in the liquid transfer tube, causing the liquid to form larger droplets during ejection. This allows using a larger nozzle diameter while still achieving high impact pressure through increased droplet diameter, thereby improving operation efficiency
Solution Approach 2:
The patent introduces dynamic vibration to the liquid flow system, making the liquid ejection process dynamic rather than static. The vibration frequency can be adjusted to optimize droplet diameter, allowing the system to adapt and achieve both high impact pressure and high operation efficiency simultaneously
3Productivity
If the droplet diameter is increased to improve operation efficiency, then the operation efficiency is improved, but the impact pressure is reduced, and erosion amount per unit time is reduced
Solution Approach 1:
The vibration generation unit applies vibration to the liquid at specific frequencies before ejection, optimizing the droplet diameter to a range that achieves both high operation efficiency and sufficient impact pressure. The vibration causes the liquid to form droplets of optimal size that balance erosion capability with operational effectiveness
Solution Approach 2:
The patent optimizes the droplet diameter parameter through vibration application, finding the optimal range where both operation efficiency and impact pressure are maximized. By controlling droplet diameter within a specific range, the system achieves high erosion rates without sacrificing impact pressure
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 increases the droplet diameter, resulting in higher erosion rates and improved operation efficiency without increasing the ejection flow rate, preventing issues like scattered liquid and peripheral device interference.
Implementation Method 1
a vibration generation unit configured to generate vibration, in which the vibration generation unit is in contact with any one of the liquid, the nozzle, and the liquid transfer tube
Data Source
AI summary
A liquid ejection device includes: a nozzle through which a liquid is ejected; a liquid transfer tube through which the liquid is transferred to the nozzle; and a vibration generation unit configured to generate vibration, in which the vibration generation unit is in contact with one of the liquid, the nozzle, and the liquid transfer tube, and when the liquid ejected from the nozzle flies as a plurality of droplets in a state where the vibration generation unit does not generate vibration, and the number of the droplets passing through a predetermined position in a unit time is defined as a droplet frequency, a frequency of the vibration generated by the vibration generation unit is equal to or less than the droplet frequency.