Pressure-Controlled Liquid Discharge Cleaning for Clogged Ports
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Solution Overview
Problem
Existing liquid discharge apparatuses struggle to effectively remove foreign matter within discharge ports and in the head flow path, particularly when the foreign matter is larger than the discharge ports, leading to clogging and reduced discharge performance.
Innovation Solution
A liquid discharge apparatus with a pressure control device that controls the pressure of the discharged material to shift between negative and positive states, using a separation membrane to manage pressure differentials for efficient removal of foreign matter within discharge ports and on the discharge surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wiper is used to wipe the discharge surface and liquid is ejected from discharge ports to clean foreign matter, then foreign matter on the discharge surface can be removed, but foreign matter within the discharge ports and head flow path cannot be effectively removed
Solution Approach 1:
The patent uses pressure control (pneumatic/hydraulic principle) to eject liquid from the storage portion through the discharge ports at high pressure, creating a flushing action that removes foreign matter from within the discharge ports and head flow path, rather than relying solely on surface wiping
Solution Approach 2:
The patent changes the pressure parameter of the liquid in the storage portion dynamically - first increasing pressure to eject liquid and foreign matter from the discharge ports, then reducing pressure to allow fresh liquid to enter and flush the flow path, achieving thorough cleaning through parameter variation
2Manufacturing precision
If the cross-sectional area of discharge ports is smaller than the flow path, then liquid discharge precision is improved, but foreign matter larger than the discharge ports cannot be removed
Solution Approach 1:
The patent addresses the size limitation by changing the approach from direct ejection through the small discharge ports to a two-stage process: first ejecting liquid and foreign matter from the storage portion through the discharge ports under high pressure, then using the discharged liquid to flush the head flow path, effectively removing foreign matter through the liquid flow dimension rather than direct mechanical ejection
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 apparatus effectively removes foreign matter from discharge ports and maintains stable discharge performance by utilizing pressure control to suction and expel foreign matter, ensuring reliable operation and reproducibility of liquid discharge.
Implementation Method 1
The pressure control device controls the pressure of the discharged material to shift from a first negative pressure state, to a second negative pressure state of a greater negative pressure than the first negative pressure state
Implementation Method 2
The pressure control device controls the pressure of the discharged material to shift from a first negative pressure state, to a second negative pressure state of a greater negative pressure than the first negative pressure state, and then to a third positive pressure state
Data Source
AI summary
A liquid discharge apparatus has a storage portion configured to store a discharged material, a discharge port configured to communicate with the storage portion and discharge the discharged material stored in the storage portion, and a pressure control device configured to control a pressure of the discharged material stored in the storage portion. The pressure control device controls the pressure of the discharged material to shift from a first negative pressure state, to a second negative pressure state of a greater negative pressure than the first negative pressure state, and then to a third positive pressure state.