Liquid Discharging Head Dual Common Flow Path Bubble Management
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Solution Overview
Problem
Existing liquid discharging heads face challenges with bubble accumulation in common flow paths due to higher flow path resistance in individual flow paths, which can lead to inefficient ink circulation and potential clogging.
Innovation Solution
The liquid discharging head incorporates a dual common flow path system with additional flow paths that communicate with the common flow paths at different positions, allowing for bidirectional ink flow between the common and individual flow paths, thereby reducing bubble stagnation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single common flow path is used to supply liquid to multiple individual flow paths, then the structure is simplified, but bubbles tend to accumulate in the common flow path due to higher flow path resistance in individual flow paths
Solution Approach 1:
The single common flow path is segmented into multiple separate common flow paths (first common flow path and second common flow path). Each common flow path is dedicated to specific individual flow paths, preventing bubble accumulation by providing separate circulation routes. This segmentation maintains structural organization while eliminating the bubble trapping problem associated with single common flow paths.
Solution Approach 2:
Introduction of a circulation flow path that connects both common flow paths creates an intermediary circulation route. This circulation path enables liquid to flow between common flow paths, ensuring that bubbles can be carried away from common flow paths through the circulation route, thus preventing bubble accumulation while maintaining a relatively simple overall structure.
2Reliability
If liquid circulation is implemented through individual flow paths, then bubble prevention is improved, but flow path resistance increases and reduces circulation efficiency
Solution Approach 1:
By segmenting the flow path system into common flow paths and individual flow paths with dedicated circulation routes, the patent reduces the total length and complexity of liquid circulation paths. Liquid can circulate efficiently through common flow paths rather than traversing the entire individual flow path network, thereby reducing flow path resistance and energy loss while still preventing bubble accumulation.
Solution Approach 2:
The circulation flow path acts as an intermediary that provides a low-resistance route for liquid circulation. Instead of liquid needing to flow through high-resistance individual flow paths for circulation, the dedicated circulation path offers a lower resistance route, maintaining circulation efficiency while still achieving effective bubble prevention.
3Reliability
If multiple flow paths are added to improve ink circulation, then bubble accumulation is reduced, but device complexity increases
Solution Approach 1:
The flow path system is segmented into distinct functional components (common flow paths, individual flow paths, and circulation flow paths) with clear definitions of liquid flow directions. This organized segmentation improves ink circulation efficiency by providing dedicated circulation routes while maintaining structural clarity that prevents excessive complexity.
Solution Approach 2:
The circulation flow path serves multiple functions: it connects both common flow paths, provides a route for bubble removal, and enables liquid circulation without requiring separate complex pumping systems for each flow path. This multi-functionality improves circulation efficiency while minimizing the increase in device complexity.
Data Source
AI summary
a first flow path communicating with the first common flow path; a second flow path communicating with the first common flow path at a position different from a position at which the first flow path communicates with the first common flow path; a third flow path communicating with the second common flow path; and a fourth flow path communicating with the second common flow path at a position different from a position at which the third flow path communicates with the second common flow path. In a first mode: through the first flow path, a liquid is supplied to the first common flow path; through the second flow path, the liquid is collected from the first common flow path; through the third flow path, the liquid is supplied to the second common flow path; and through the fourth flow path, the liquid is collected from the second common flow path.