Liquid Discharge Head Inclined Flow Path Bubble Exclusion
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Solution Overview
Problem
In liquid discharge heads, the shape of the common liquid chamber can cause blockages or allow bubbles to flow into the liquid chamber, disrupting the circulation of liquid and affecting the discharge process.
Innovation Solution
A liquid discharge head design featuring a liquid chamber, supply and discharging flow paths, and a first connecting flow path with inclined bottom surfaces to prevent bubble entry and ensure smooth ink flow, where the first angle is between 0 and 90 degrees and the second angle is greater than the first angle, facilitating efficient ink circulation and discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the common liquid chamber has a conventional shape, then the liquid circulation is simple, but bubbles may flow into the liquid chamber or liquid flow may be blocked
Solution Approach 1:
The bottom surface of the first connecting flow path is designed with curved inclined surfaces instead of sharp angles or horizontal surfaces. The first inclined surface has a first curvature radius, and the second inclined surface has a second curvature radius, creating smooth transitions that guide liquid flow while preventing bubble entrapment and flow blockages.
Solution Approach 2:
The invention changes the geometric parameters of the flow path bottom surface by introducing specific curvature radii for different inclined surfaces. The first curvature radius and second curvature radius are optimized to control flow dynamics, ensuring smooth liquid circulation while excluding bubbles from the liquid chamber.
2Reliability
If the first connecting flow path has a steep inclination, then bubble entry is prevented, but liquid flow resistance increases
Solution Approach 1:
By using curved inclined surfaces with optimized curvature radii, the flow path achieves a balance between inclination and flow smoothness. The curvature allows the surface to be sufficiently inclined to prevent bubble entry while maintaining smooth liquid flow and minimizing turbulence and energy loss.
Solution Approach 2:
Different sections of the bottom surface have different curvature radii tailored to their specific functions. The first inclined surface has a first curvature radius optimized for one aspect of flow control, while the second inclined surface has a second curvature radius optimized for another aspect, allowing localized optimization of both bubble exclusion and flow resistance.
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 design effectively inhibits bubble entry into the pressure chambers while maintaining smooth ink flow, enhancing the reliability and efficiency of the liquid discharge process.
Implementation Method 1
a first supply bottom surface inclined downward with respect to a horizontal plane at a first angle from the supply flow path toward the liquid chamber, and a second supply bottom surface located between the first supply bottom surface and the liquid chamber and inclined downward with respect to the horizontal plane at a second angle
Data Source
AI summary
A liquid discharge head includes: a liquid chamber; a supply flow path supplying liquid to the liquid chamber; a discharging flow path being provided away from the supply flow path in a horizontal direction and discharging the liquid from the liquid chamber; a first-connecting-flow-path communicating between the liquid chamber and the supply flow path; and nozzles for discharging the liquid supplied from the liquid chamber. The first-connecting-flow-path includes a first-supply-bottom-surface inclined downward with respect to a horizontal plane at a first-angle from the supply flow path toward the liquid chamber, and a second-supply-bottom-surface located between the first-supply-bottom-surface and the liquid chamber and inclined downward with respect to the horizontal plane at a second-angle from the first-supply-bottom-surface toward the liquid chamber. The first-angle is greater than or equal to 0 degrees and is less than 90 degrees, and the second-angle is greater than the first-angle and is less than 90 degrees.