Negative Pressure Regulation Valve With Offset Outflow Holes
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Solution Overview
Problem
Inkjet recording apparatuses face challenges in maintaining high print quality due to residue of air and solid matter in the outflow-side pressure chamber, which affects the ink ejection state.
Innovation Solution
A negative pressure regulation valve with a unique configuration that includes an inflow-side and outflow-side pressure chamber, a communication hole, and a movable valve member, where the outflow holes are positioned to prevent direct alignment, promoting a rotating flow that efficiently discharges air and solid matter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single outflow hole is used in the outflow-side pressure chamber, then the structure is simple, but air and solid matter residue efficiently
Solution Approach 1:
The outflow-side pressure chamber is segmented into multiple outflow holes (first outflow hole and second outflow hole) positioned at different locations. This segmentation allows different substances (air and solid matter) to be discharged through different holes, improving the efficiency of residue removal while maintaining structural simplicity.
Solution Approach 2:
Different outflow holes are positioned at specific locations within the outflow-side pressure chamber to create local quality variations. The first outflow hole is positioned to discharge air efficiently, while the second outflow hole is positioned to discharge solid matter, ensuring each hole performs its specific function optimally.
2Device complexity
If outflow holes are aligned in a straight line, then the structure is simple, but air and solid matter residue effectively
Solution Approach 1:
The outflow holes are arranged asymmetrically within the outflow-side pressure chamber rather than in a straight line. This asymmetric arrangement creates different flow paths for air and solid matter, preventing residue accumulation and improving discharge efficiency while maintaining relatively simple structure.
3Device complexity
If the valve member remains stationary, then the structure is simple, but pressure regulation cannot adapt to changes
Solution Approach 1:
The valve member is designed to move dynamically in response to pressure changes within the pressure chamber. When pressure exceeds a predetermined threshold, the valve member opens to release pressure; when pressure is normal, the valve member closes to maintain pressure. This dynamic behavior enables adaptive pressure regulation without complex control systems.
Solution Approach 2:
The valve member operates autonomously based on pressure conditions within the system. It automatically opens or closes according to the pressure state, eliminating the need for external control mechanisms or power sources, thus achieving simple yet effective pressure regulation.
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 effectively suppresses the residue of air and solid matter, ensuring consistent ink ejection and improved print quality by efficiently removing impurities from the outflow-side pressure chamber.
Implementation Method 1
The valve member is inserted in the communication hole and movable, in accordance with change of pressure inside the outflow-side pressure chamber, between a closing position for closing the communication hole and an opening position for opening the communication hole
Implementation Method 2
a first line extending in an outflow direction of liquid from the first outflow hole and a second line extending in an outflow direction of liquid from the second outflow hole do not coincide with each other
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A negative pressure regulation valve (31) includes an inflow-side pressure chamber (50) including a liquid inflow hole (50a), an outflow-side pressure chamber (51) including a liquid outflow hole (51a, 51b), a communication hole (54), and a valve member (52) inserted in the communication hole (54) and movable, in accordance with change of pressure inside the outflow-side pressure chamber (51), to a closing position for closing the communication hole (54) and an opening position for opening the communication hole (54). The outflow-side pressure chamber (51) includes, as the liquid outflow hole (51a, 51b), a first outflow hole (51a) formed below the communication hole (54) and a second outflow hole (51b) formed above the communication hole (54). As seen from a communication direction of the communication hole (54), a first line (L1) extending in an outflow direction of liquid from the first outflow hole (51a) and a second line (L2) extending in an outflow direction of liquid from the second outflow hole (51b) do not coincide with each other.