Link Channel Dent for Air Bubble Detention in Liquid Jetting
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Solution Overview
Problem
In liquid jetting apparatuses with two pressure chambers, air bubbles in the fluid can cause pressure imbalances, leading to unstable operation of jetting from the nozzle.
Innovation Solution
A dent portion is formed on the inner wall of the link channel, aligned with the nozzle axis, to detain air bubbles, maintaining pressure balance between the pressure chambers and allowing for their removal before jetting, thereby preventing unstable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two pressure chambers are used to jet liquid from a nozzle, then the liquid jetting capability is improved, but air bubbles in the link channel cause pressure imbalance leading to unstable operation
Solution Approach 1:
The patent converts the harmful effect of air bubbles into a beneficial feature by designing a dent portion that deliberately traps air bubbles. Instead of allowing air bubbles to cause pressure imbalance and unstable jetting, the dent portion captures them, preventing them from disrupting the liquid flow and pressure equilibrium in the link channel.
Solution Approach 2:
The dent portion acts as an intermediary element between the link channel and the pressure chambers. It serves as a buffer zone that intercepts and holds air bubbles, preventing them from directly affecting the pressure balance and liquid jetting stability in the system.
2Reliability
If air bubbles are removed continuously during jetting operation, then jetting stability is improved, but the apparatus load and complexity increase
Solution Approach 1:
The dent portion performs preliminary action by trapping air bubbles before they can enter the pressure chambers and disrupt jetting operation. This preventive measure eliminates the need for continuous air bubble removal systems during jetting, reducing apparatus complexity and load.
Solution Approach 2:
The system uses its own structure (the dent portion in the link channel) to handle air bubble removal automatically. The dent portion self-regulates by capturing air bubbles during non-jetting periods, eliminating the need for external air removal devices or complex control systems.
Data Source
AI summary
A liquid jetting apparatus includes: a nozzle plate having a nozzle; and a channel unit joined with the nozzle plate. The channel unit is formed with a first pressure chamber, a second pressure chamber, and a link channel linking the first pressure chamber and the second pressure chamber. In the channel unit, a dent portion is formed on an inner wall, which defines the link channel, at a part overlapping with an axis line of the nozzle. The dent portion is dented in a direction away from the nozzle.