Liquid Discharging Head Variable Channel Area
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Solution Overview
Problem
Conventional liquid discharging heads face issues with air remaining in the communicating channel and pressure concentration due to inconsistent cross-sectional areas of the communicating channel, leading to either weak flow or inadequate pressure relief.
Innovation Solution
A liquid discharging head design where the cross-sectional area of the communicating channel between adjacent manifolds varies based on the number of nozzle rows associated with each manifold, ensuring an appropriate flow and minimizing air retention and pressure concentration by adjusting the channel resistance accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the cross-sectional area of the communicating channel is increased, then the pressure concentration is reduced, but air remains in the communicating channel
Solution Approach 1:
The cross-sectional area of the communicating channel is made variable along its length, transitioning from a smaller area near the supply manifolds to a larger area toward the nozzle rows. This dynamic geometry allows the channel to provide sufficient flow capacity (larger area) to prevent air accumulation while maintaining adequate flow velocity (smaller area) to expel air effectively, thereby resolving the contradiction between pressure equalization and air removal.
Solution Approach 2:
The patent changes the geometric parameter (cross-sectional area) of the communicating channel along its length. By gradually increasing the cross-sectional area from the supply manifold end toward the nozzle end, the channel resistance is optimized to balance pressure distribution and air expulsion, allowing the system to overcome the trade-off between preventing pressure concentration and removing air.
2Reliability
If the cross-sectional area of the communicating channel is decreased, then air is expelled from the communicating channel, but pressure concentration occurs in the vicinity of the other end of the supply manifolds
Solution Approach 1:
The variable cross-sectional area design allows the communicating channel to maintain smaller area sections near the supply manifolds for effective air expulsion while providing larger area sections toward the nozzle rows for pressure equalization. This dynamic geometry optimization resolves the contradiction between air removal efficiency and pressure distribution.
Solution Approach 2:
By changing the cross-sectional area parameter along the length of the communicating channel, the patent optimizes the balance between flow resistance (for air expulsion) and flow capacity (for pressure equalization), eliminating pressure concentration while ensuring complete air removal.
3Ease of manufacture
If a constant cross-sectional area is used for the communicating channel, then the manufacturing is simplified, but either weak flow or inadequate pressure relief occurs
Solution Approach 1:
The communicating channel is designed with different cross-sectional areas in different sections: a smaller area near the supply manifolds for air expulsion and a larger area toward the nozzle rows for pressure equalization and flow capacity. This local quality differentiation optimizes both air removal and pressure distribution without significantly complicating manufacturing.
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 effectively suppresses air retention and pressure concentration, ensuring a stable and efficient liquid discharge by optimizing the flow and pressure distribution through varying channel resistances.
Implementation Method 1
a flow of liquid in the communicating channel is generated only by a difference in a flow amount of the liquid between the supply manifolds connected to the communicating channel
Data Source
AI summary
A liquid discharging head includes: manifolds to which liquid is supplied; at least one nozzle row associated with each of the manifolds; and a communicating channel directly connecting two manifolds which are included in the manifolds and which are adjacent to each other. The at least one nozzle row includes nozzles configured to discharge the liquid, the nozzles communicating with one manifold with which the at least one nozzle row is associated. A first number is a number of the nozzle row associated with one of the two manifolds and a second number is a number of the nozzle row associated with the other of the two manifolds, and a cross-sectional area of the communicating channel is different between a case that a first number and a second number are same, and another case that the first number and the second number are different.