Fluidic Chip Oscillator for Cold Weather Fan Spray
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Solution Overview
Problem
Existing windshield washer systems fail to produce a desirable fan spray pattern at low temperatures due to increased surface tension and viscosity of the fluid, which limits the ability to generate velocity and oscillation, requiring higher pump pressure that may not be effective.
Innovation Solution
A fluidic chip with a constricted throat and a four-way intersection flow control zone, paired with backflow control channels that alternate to maintain flow energy and promote oscillation, allowing for a fan spray pattern at standard pump pressures even in low temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If pump pressure is increased to promote oscillation in cold weather, then fluid velocity and fan spray development improve, but system complexity and energy consumption increase
Solution Approach 1:
The patent modifies the geometric parameters of the interaction chamber, specifically the ratio of chamber length to throat diameter (L/D), to optimize fluid oscillation characteristics. By changing the physical dimensions of the chamber rather than increasing pump pressure, the system achieves better fan spray patterns at lower temperatures without proportionally increasing energy consumption
Solution Approach 2:
The patent replaces the reliance on high mechanical pump pressure with a fluidic oscillation mechanism driven by vortex formation and interaction chamber geometry. The oscillation is generated through fluid dynamic effects (vortex shedding and interaction) rather than purely mechanical forcing, reducing the need for high pump pressure
2Shape
If pump pressure is increased to promote oscillation in cold weather, then fan spray pattern improves, but device complexity increases
Solution Approach 1:
The patent optimizes the interaction chamber geometry, specifically the L/D ratio, to naturally promote oscillation and fan spray formation. This geometric parameter change allows the system to achieve desirable spray patterns without adding complex mechanical components or control systems
Solution Approach 2:
The fluidic oscillation mechanism is self-regulating and self-activating based on flow conditions. The vortex formation and interaction chamber geometry automatically generate oscillation when fluid flows through, without requiring external control mechanisms, sensors, or complex device architecture
3Power
If fluid viscosity increases in cold weather, then fluid delivery pressure decreases for the same energy input, but oscillation and fan spray development are reduced
Solution Approach 1:
The patent changes the interaction chamber geometry (L/D ratio) to compensate for increased fluid viscosity at low temperatures. The optimized geometry creates stronger vortex formation and fluid interaction effects that maintain oscillation amplitude and fan spray development even when fluid viscosity increases due to cold weather
Solution Approach 2:
The patent replaces reliance on high mechanical pump pressure with fluid dynamic oscillation mechanisms. The vortex-driven oscillation and interaction chamber effects generate sufficient fluid velocity and spray pattern formation without requiring proportionally higher pump pressure, even in cold weather conditions
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 fluidic chip design ensures a stable fan spray pattern at temperatures as low as -10°C and maintains a significant fan angle down to -20°C, enhancing fluid velocity and turbulence to facilitate operation without the need for increased pump pressure.
Implementation Method 1
As flow progresses and the interaction chamber is filled, vortices are formed on either side of the power stream. As one vortex becomes dominant, the power stream is diverted against the opposite wall and oscillation begins
Implementation Method 2
a constricted throat fluid entrance defining a power nozzle opening into a four-way intersection flow control zone
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A fluidic chip defining an oscillator device for a spray system which provides a fan spray pattern of a fluid mixture at low temperature conditions while using standard fluid pump pressures. The fluidic chip configurations as described may provide a substantially stable exit fan angle at temperatures as low as about -10 degrees Celsius.