Spray Ramp Opening Shapes for Window Cleaning
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Solution Overview
Problem
Existing vehicle window wiper systems face inefficiencies in defrosting and cleaning, particularly with dirty windshields, due to insufficient liquid distribution, leading to prolonged operations incompatible with motor vehicle safety standards.
Innovation Solution
A washing liquid spraying device with ramps featuring openings of specific shapes, such as oblong, conical, or tetrahedral, that project the liquid as a beam perpendicular to the ramp direction, enhancing distribution and impact area, and optionally with inclined projections to leverage wiper blade and aerodynamic movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If simple circular openings are used in the ramps, then the device structure remains simple, but the liquid distribution and wettability of the window are insufficient
Solution Approach 1:
The patent applies local quality by varying the shape of openings in different locations on the ramps. Specifically, openings are designed with different geometries (circular, oblong, slot-shaped, triangular, etc.) depending on their position and the desired spray pattern. This allows different regions of the window to receive appropriately distributed liquid, improving overall wettability while maintaining manufacturing feasibility through standardized opening types.
Solution Approach 2:
The patent implements parameter changes by modifying the geometric parameters of the openings (shape, size, orientation, distribution density) to optimize liquid projection. The openings can be circular, oblong, slot-shaped, triangular, or other forms, with dimensions and orientations adjusted to create specific spray patterns that enhance liquid distribution and window coverage.
2Productivity
If larger quantities of liquid are projected to clean particularly dirty windshields, then cleaning effectiveness improves, but the operation time increases beyond safety requirements
Solution Approach 1:
The patent applies dimensionality change by transitioning from point-like circular openings to extended shape openings (oblong, slot-shaped, triangular) that project liquid in extended beams rather than concentrated streams. This creates a broader liquid distribution pattern that covers more window surface area simultaneously, improving cleaning speed and effectiveness without requiring excessive liquid quantity or prolonged operation time.
Solution Approach 2:
The patent implements segmentation by dividing the liquid projection function across multiple ramps with multiple openings of various shapes. Each opening contributes to a specific region of the window, and the combined effect of all openings creates comprehensive coverage. This segmented approach allows efficient liquid distribution that accelerates cleaning while maintaining safety time requirements.
3Force
If the wiper blade applies higher pressure to improve contact force, then wiping effectiveness increases, but the mechanical stress on the blade structure increases
Solution Approach 1:
The patent applies mechanics substitution by replacing the reliance on high mechanical pressure with a fluid dynamics approach. Instead of depending solely on the wiper blade's mechanical contact force, the system uses shaped openings to project liquid in extended beams that enhance wetting and cleaning through fluid pressure and distribution patterns. This reduces the mechanical stress on the blade structure while maintaining or improving wiping effectiveness.
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 improved liquid distribution accelerates defrosting and cleaning by ensuring better wettability of the window, addressing the inefficiencies in existing systems by achieving broader and deeper liquid impact, thus enhancing safety and effectiveness.
Implementation Method 1
at least one opening has a shape capable of projecting the washing liquid in the form of a beam extending around the direction of projection, perpendicular to said ramp
Implementation Method 2
The washing liquid is projected in a narrow beam having an impact extended in depth over a distance much greater than that of a point impact obtained with a substantially rectilinear jet. As a result, the quantity of liquid projected is better distributed on the window. The wettability of the window is therefore increased
Data Source
Figure 1a~1b
Figure 1c~2a
Figure 2b~4a
AI summary
The invention relates to a device for spraying washing liquid onto a car window, including at least one line (42a, 42b) having at least one opening (421a, 421b) for spraying said liquid onto said window in a given direction (da, db). According to the invention, at least one opening (421a, 421b) has a shape capable of spraying the washing liquid in the form of a stream (Fa, Fb) extending around the spraying direction (da, db), perpendicular to said line (42a, 42b). The invention is used in motor vehicle window wiping systems.