Multi-Stage Fluidic Oscillator with Variable Frequency Assembly
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Solution Overview
Problem
Conventional fluidic oscillators in spas and therapeutic devices typically operate at a fixed frequency, requiring specific pressure conditions and are impractical to modify, due to their complex multilayer designs and need for separate inlet feeds, limiting their ability to produce variable frequency outputs.
Innovation Solution
A single-layer fluidic oscillator design with two inertance loops and a gate system allows for variable frequency outputs at constant pressure, using a splitter and dog ear protrusions to adjust the frequency, enabling selective communication with ambient fluid to alter the output jet frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-layer fluidic oscillator design with separate inlet feeds is used, then frequency control capability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the frequency control functionality into a single-layer structure by integrating the inertance loop and gate mechanism within the same planar circuit as the oscillating jet, eliminating the need for separate inlet feeds and multilayer stacking. This consolidation maintains frequency adjustability while reducing structural complexity.
Solution Approach 2:
The single-layer fluidic oscillator design achieves multi-functionality by incorporating both the oscillating jet generation and frequency control mechanisms within one integrated structure. The gate mechanism serves dual purposes: controlling fluid flow and adjusting oscillation frequency, thereby eliminating the need for separate frequency control components.
2Adaptability or versatility
If a multi-layer fluidic oscillator design is used, then frequency control capability is improved, but manufacturing and assembly challenges increase
Solution Approach 1:
The patent consolidates multiple functional layers into a single manufacturable layer, reducing assembly steps and simplifying the manufacturing process. The integrated design allows for easier fabrication using standard single-layer fluidic oscillator manufacturing techniques while maintaining frequency control functionality.
3Ease of manufacture
If a single-layer fluidic oscillator design is used, then ease of manufacture is improved, but frequency control capability deteriorates
Solution Approach 1:
The single-layer design achieves frequency control through self-service mechanisms where the gate and inertance loop are integrated directly into the oscillating circuit. The system uses its own fluid flow dynamics to adjust frequency without requiring external control systems or separate inlet feeds, thereby maintaining manufacturability while preserving frequency control capability.
4Adaptability or versatility
If separate inlet feeds are used for frequency control, then frequency adjustment capability is improved, but device complexity and assembly difficulty increase
Solution Approach 1:
The patent combines the frequency adjustment mechanism with the main oscillating circuit by integrating the gate and inertance loop into the same fluidic path. This eliminates the need for separate inlet feeds and reduces the number of connection points, thereby reducing overall device complexity while maintaining frequency adjustment capability.
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 design enables the production of oscillating spray patterns at multiple frequencies without changing fluid pressure, simplifying manufacturing and user operation by eliminating the need for complex multilayer structures and separate inlet feeds.
Implementation Method 1
The design employs two separate inertance loops associated with separate fluidic power nozzles and interaction chambers arranged in series
Implementation Method 2
At least one of these loops includes a gate to allow for selective communication with ambient fluid (i.e., fluid beyond the outlet of the circuit) so as to alter the frequency of the outuput jet
Implementation Method 3
The design can also use a splitter and optional dog ear protrusions in or near the outlet to further enhance and fine tune the traits of the output
Data Source
AI summary
A multi-stage fluidic oscillating circuit and system can produce an output spray of selectively varying frequency, even though the fluid supplied to the circuit/system is maintained at a substantially constant pressure. The circuit is characterized by two successive stages, each having a power nozzle aligned around a central axis. Upstream and downstream inertance loops are included in each of the stages, with fluid from one of these loops being selectively released to affect the frequency change in the output spray. The circuit is also characterized by a splitter and optional dog ear style protrusions formed in the outlet of the circuit.