Liquid Jetting Head Bubble Removal via Segmented Circulation
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Solution Overview
Problem
Existing liquid jetting heads face difficulties in effectively removing air bubbles from the vicinity of nozzles, leading to potential liquid jetting failures.
Innovation Solution
A liquid jetting head configuration featuring a supply manifold with a first circulation channel and a second circulation channel that includes a return manifold and return channel, where the return port is positioned closer to the outflow port than the inflow port, allowing air bubbles to flow from the nozzles to the supply manifold and facilitating their removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air bubbles are discharged to the circulation channel as in conventional configurations, then air bubbles in the common liquid chamber can be removed, but air bubbles in the vicinity of the nozzles cannot be effectively removed
Solution Approach 1:
The circulation channel is segmented into two distinct channels: a first circulation channel that removes air bubbles from the common liquid chamber, and a second circulation channel that specifically removes air bubbles from the nozzle vicinity. This segmentation allows each channel to be optimized for its specific function, effectively resolving the contradiction between removing air bubbles and maintaining system simplicity.
Solution Approach 2:
A separator is introduced as an intermediary component between the nozzles and the first circulation channel. This separator directs liquid containing air bubbles from the nozzle vicinity into the second circulation channel, preventing direct discharge into the first circulation channel. The intermediary enables selective air bubble removal from different locations without complicating the overall system.
2Reliability
If a single circulation channel is used, then the device structure remains simple, but air bubbles in both the common liquid chamber and nozzle vicinity cannot be simultaneously removed
Solution Approach 1:
The circulation system is divided into two specialized channels: the first circulation channel handles air bubble removal from the common liquid chamber, while the second circulation channel handles air bubble removal from the nozzle vicinity. This functional segmentation enables simultaneous removal of air bubbles from both locations, improving overall reliability without requiring a completely new system design.
Solution Approach 2:
The separator acts as an intermediary that divides the liquid flow from the nozzles, directing it into the second circulation channel while allowing the first circulation channel to continue its function. This intermediary structure enables the system to handle multiple air bubble removal functions with minimal additional complexity.
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 ensures efficient removal of air bubbles from the nozzle vicinity and within the supply manifold, enhancing the reliability of liquid jetting by maintaining consistent liquid flow and reducing the likelihood of failures.
Implementation Method 1
air bubbles go up due to buoyancy and are guide to the discharge port of the common liquid chamber
Data Source
AI summary
There is provided a liquid jetting head including: a supply manifold configured to define a first circulation channel through which a liquid in the supply manifold circulates; descenders that communicate with the supply manifold, and which is configured to guide the liquid to nozzles, respectively; and a second circulation channel configured to guide the liquid not discharged from the nozzles to the supply manifold. The second circulation channel includes a return manifold that extends to communicate with the descenders, and a return channel that communicates with the return manifold and communicates with the supply manifold via a return port. A first end of the first circulation channel in the supply manifold is an outflow port and a second end of the first circulation channel in the supply manifold is an inflow port. In the supply manifold, the return port is closer to the outflow port than to the inflow port.