Liquid Discharge Head Supply Port Centering for Pressure Loss Reduction
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Solution Overview
Problem
Existing liquid discharge heads face challenges in efficiently managing pressure distribution and ink circulation, leading to increased size and pressure loss, which affects the stability and quality of ink droplet discharge.
Innovation Solution
The liquid discharge head incorporates a configuration with a supply port at the center of the common liquid chamber and delivery ports outside the chamber, along with a circulation liquid chamber, to optimize pressure distribution and reduce pressure loss, featuring a common liquid chamber with a greater cross-sectional area than the circulation liquid chamber to minimize fluid resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the supply port is disposed at one end of the common liquid chamber, then the structure is simpler, but the pressure distribution becomes uneven and pressure loss increases
Solution Approach 1:
The supply port is positioned at the center of the common liquid chamber rather than at one end, creating a symmetric pressure distribution pattern that reduces pressure loss while maintaining structural simplicity
2Area of stationary object
If the common liquid chamber has a small cross-sectional area, then the device size is reduced, but the fluid resistance increases
Solution Approach 1:
The common liquid chamber is designed with a larger cross-sectional area specifically at the supply port region to reduce fluid resistance, while other parts of the chamber maintain compact dimensions to control overall device size
3Productivity
If the circulation channel is extended to improve ink circulation, then the circulation efficiency is enhanced, but the device size increases
Solution Approach 1:
The circulation channel is arranged to pass through or alongside existing components such as the common liquid chamber and nozzle plate, utilizing available space efficiently to achieve effective circulation without increasing device footprint
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 reduces the size of the liquid discharge head while maintaining efficient ink circulation and droplet discharge quality, ensuring stable operation and high image quality.
Implementation Method 1
The circulation liquid chamber (43) is communicated with the plurality of individual liquid chambers (22)
Implementation Method 2
The common liquid chamber (12) extends longer in the nozzle array direction (D), to supply liquid to the plurality of individual liquid chambers (22)
Implementation Method 3
The supply port (71) is disposed at a center of the common liquid chamber (12) in the nozzle array direction (D), to supply liquid to the common liquid chamber (12)
Implementation Method 4
The delivery port (72) is disposed outside the common liquid chamber (12) in the nozzle array direction (D), to deliver liquid from the circulation liquid chamber (43)
Data Source
AI summary
A liquid discharge head includes a nozzle row, individual liquid chambers, a common liquid chamber, a circulation liquid chamber, a supply port, and a delivery port. The nozzle row includes nozzles to discharge liquid. The nozzles are arrayed in a nozzle array direction. The individual liquid chambers are communicated with the nozzles and arrayed in the nozzle array direction. The common liquid chamber extends longer in the nozzle array direction, to supply liquid to the individual liquid chambers. The circulation liquid chamber is communicated with the individual liquid chambers. The supply port is disposed at a center of the common liquid chamber in the nozzle array direction, to supply liquid to the common liquid chamber. The delivery port is disposed outside the common liquid chamber in the nozzle array direction, to deliver liquid from the circulation liquid chamber.