Fluid Ejection Device Pressure Control and Leakage Detection
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Solution Overview
Problem
Fluid ejection devices face challenges in detecting when the fluid supply path cannot be closed, leading to inadequate inner pressure and potential leakage, which affects the device's functionality and safety.
Innovation Solution
A fluid ejection device is equipped with a pressure detection unit, a channel opening and closing unit, a press control unit, and a movement speed acquisition unit to determine if the channel is closed by monitoring the movement speed of the fluid pressing unit and inner pressure, allowing for timely detection and prevention of leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a valve is provided on the fluid supply path to close the channel when the operation switch is not operated, then the inner pressure of the fluid supply unit can be increased to a proper level, but it becomes difficult to detect when the channel is not properly closed
Solution Approach 1:
The system implements feedback by monitoring the movement speed of the fluid pressing unit and comparing it against expected values. When the channel is properly closed, the pressing unit should stop moving once target pressure is reached. If the channel is not closed, the pressing unit continues moving at abnormal speeds. This feedback mechanism enables automatic detection of closure failures without adding complex sensors to the valve itself.
Solution Approach 2:
The fluid pressing unit serves as an intermediary element that indirectly indicates the valve's closure state. Instead of directly sensing the valve position or channel closure, the system uses the pressing unit's movement characteristics as a mediator to infer whether the channel is properly closed. This approach simplifies the detection system while maintaining reliability.
2Reliability
If the channel is not properly closed due to connection issues or valve failure, then fluid leakage occurs and pressure control is lost, but traditional systems lack the capability to detect such failures
Solution Approach 1:
The system performs self-diagnosis by automatically monitoring its own operational parameters. The control unit uses the movement speed data from the fluid pressing unit to self-detect whether the channel closure is functioning properly, eliminating the need for external inspection or complex manual testing procedures. This self-service capability enhances reliability while keeping the system easy to operate.
Solution Approach 2:
The invention replaces direct mechanical sensing of valve closure with an electronic control system that monitors hydraulic parameters. Instead of using mechanical switches or position sensors on the valve, the system uses electronic monitoring of the fluid pressing unit's movement characteristics to detect closure failures, substituting a simpler electronic system for a complex mechanical sensing system.
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 device can effectively detect non-closure of the fluid channel, prevent fluid leakage, and enhance user safety by alerting the operator, thereby improving the overall reliability and safety of the fluid ejection process.
Implementation Method 1
a pressure detection unit that detects an inner pressure of the fluid accommodation portion
Implementation Method 2
a fluid pressing unit that moves in a pressing direction according to a movement command, and presses the fluid accommodation portion to cause the fluid to flow out of the fluid outlet
Data Source
AI summary
A fluid ejection device includes a fluid accommodation portion having an outlet and a fluid pressing unit that causes the fluid to flow out of the fluid outlet through a channel. A fluid ejection unit ejects in a pulsed manner the fluid received from a fluid intake port connected to the channel. A pressure detection unit detects an inner pressure of the fluid accommodation portion. A press control unit controls the inner pressure of the fluid accommodation portion to approach a target pressure value when the channel is closed. A channel determination unit determines that the channel is not closed if a detected movement speed of the fluid pressing unit is a predetermined speed or greater when a predetermined amount of time has elapsed after a difference between the inner pressure of the fluid accommodation portion and the target pressure value becomes less than a predetermined value.