Windshield Wiper Nozzle Laminar Flow Liquid Distribution
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Solution Overview
Problem
Existing wiper blade designs with liquid projection devices consume excessive washing liquid and cause streaks on windshields due to inefficient liquid distribution, leading to reduced visibility for drivers.
Innovation Solution
A nozzle is structured and oriented to project a jet of liquid onto the squeegee lip, allowing it to flow laminarly along the squeegee, with a one-piece pipe integrated into the cap for precise dimensional tolerance and flexible orientation, reducing liquid consumption and streaks by ensuring a focused and efficient liquid distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large conical jet of liquid is projected simultaneously onto a significant part of the squeegee lip, then the squeegee lip is covered with washing liquid, but washing liquid consumption increases and streaks are caused on the windshield
Solution Approach 1:
The liquid projection is segmented into multiple separate jets projected at different positions along the squeegee lip rather than one large conical jet. This segmentation allows each jet to flow laminarly along the lip without spreading widely, reducing both liquid consumption and streak formation while ensuring complete coverage.
Solution Approach 2:
Each liquid jet is directed at a specific local position on the squeegee lip with precise orientation and angle. The jets are tailored to flow along specific sections of the lip, creating localized wetting zones that combine to cover the entire lip surface without excessive spreading or ricocheting that causes streaks.
2Quantity of substance
If multiple liquid jets are projected at different positions along the squeegee lip, then liquid consumption is reduced and streaks are minimized, but the device complexity increases
Solution Approach 1:
Multiple separate nozzle units are merged into a single integrated nozzle structure that projects multiple jets simultaneously. This combining approach maintains the benefits of segmented liquid projection while simplifying the overall device structure, reducing the number of separate components, and easing manufacturing and installation.
3Ease of operation
If the nozzle is oriented to project liquid at a specific angle for laminar flow, then liquid flows efficiently along the squeegee lip, but manufacturing precision requirements increase
Solution Approach 1:
The nozzle is oriented at a specific angle (approximately 45 degrees) that creates an equipotential condition for liquid flow along the squeegee lip. This optimal angle allows the liquid to flow laminarly under gravity and surface tension forces without requiring extremely precise manufacturing tolerances, as the flow dynamics are favorably aligned at this specific orientation.
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 significantly reduces washing liquid consumption and minimizes streaks on windshields by ensuring a laminar flow of liquid along the squeegee lip, enhancing driver visibility while maintaining manufacturing simplicity and flexibility in nozzle orientation.
Implementation Method 1
The jet of liquid touches the surface of the squeegee lip in a limited place and close to the end in a sufficiently tangent way so that it can then flow along the squeegee lip, over the major part of the lip of the squeegee, mainly laminar.
Implementation Method 2
In this rest position, the flexible lip of the flexible squeegee resting on the glazed surface, this flexible lip forms a concavity over its entire length, concavity in which the jet of projected liquid can then flow more easily and further while maintaining an essentially laminar flow.
Implementation Method 3
If the washing liquid has not flowed over the entire length of the squeegee lip, when the squeegee is raised, the centrifugal force will ensure the distribution of the liquid to the end of the squeegee opposite to that which carries the nozzle.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a vehicle windshield wiper blade comprising an elongate flexible scraper (1), a cap (3) covering one end of the scraper (1), and a device (2) for spraying liquid onto the wiping lip of the scraper (1). The wiper blade is characterised in that the liquid-spraying device (2) comprises: a nozzle (4) structured and oriented such as to spray a jet of liquid from one end of the scraper (1), which jet then flows along the lip of the scraper (1); and a duct portion (5) integral with the cap (3), said duct portion having one end connected to the nozzle (5) and another end intended to be connected to a liquid supply pipe.