Liquid Discharge Apparatus Bypass Channel for Degassing
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Solution Overview
Problem
In liquid discharge apparatuses, the small channels in flow-through type liquid discharge heads lead to slow liquid circulation during degassing, reducing the flow rate and increasing degassing time due to the presence of gas in the liquid.
Innovation Solution
A novel liquid discharge apparatus with a circulation channel, a liquid discharge head, and a bypass channel that switches between two routes for degassing, allowing for differential pressure control and efficient liquid circulation, including a first degassing operation with higher pressure and a second operation at lower pressure to enhance degassing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid is circulated through the liquid discharge head during degassing, then gas in the liquid is removed, but the circulation flow rate decreases due to small channels in the head
Solution Approach 1:
The circulation system is divided into two separate routes: a first route that bypasses the liquid discharge head for high-speed circulation, and a second route that passes through the head for degassing. This segmentation allows each route to be optimized for its specific function, resolving the contradiction between flow rate and degassing effectiveness
Solution Approach 2:
A switch mechanism is introduced as an intermediary device to control the circulation route. The switch enables selective routing of liquid flow between the bypass route and the head route, allowing the system to dynamically adjust between high flow rate mode and degassing mode based on operational requirements
2Loss of time
If liquid is circulated at high flow rate during degassing, then circulation time is reduced, but gas removal efficiency decreases due to insufficient residence time in the head
Solution Approach 1:
The circulation path is segmented into a bypass route for rapid liquid turnover and a head route for thorough degassing. By separating these functions into distinct routes, the system achieves both high circulation speed and effective gas removal without compromising either objective
Solution Approach 2:
The system performs preliminary circulation through the bypass route to quickly move liquid through the system, then directs flow through the head route for targeted degassing. This preliminary action approach minimizes overall degassing time while ensuring adequate gas removal when liquid passes through the head
3Productivity
If a bypass channel is added to the circulation system, then circulation flow rate increases, but device complexity increases
Solution Approach 1:
The bypass channel is integrated with the existing circulation channel to form a unified system. The switch mechanism merges the control functions for both routes into a single device, allowing the system to maintain high productivity through the bypass while minimizing the increase in overall device complexity through functional integration
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 improves degassing efficiency by increasing the liquid circulation flow rate and reducing the time required for degassing, while preventing bubble formation and enhancing the reliability of the liquid discharge process.
Implementation Method 1
a pressure generator to generate pressure to circulate the liquid in the circulation channel
Implementation Method 2
a degassing device to degas the liquid in the circulation channel
Data Source
AI summary
A liquid discharge apparatus includes a circulation channel in which liquid circulates, a liquid discharge head disposed on the circulation channel to discharge the liquid, a bypass channel to connect an upstream portion and a downstream portion of the liquid discharge head, a switch to switch the circulation channel between a first route in which the bypass channel is a part of the circulation channel and a second route in which the bypass channel is not a part of the circulation channel, a pressure generator to generate pressure to circulate the liquid in the circulation channel, a degassing device to degas the liquid in the circulation channel, and control circuitry to perform a degassing operation to degas the liquid by circulating the liquid in the circulation channel.