Disc Pump Actuator Isolator Bonding
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Solution Overview
Problem
Existing acoustic resonance pumps face challenges in maintaining efficient operation due to stress on bonds between components and difficulties in making robust electrical connections without disrupting resonance or damping motion, especially in two-cavity designs.
Innovation Solution
A combined actuator and isolator assembly is designed with conductive tracks and a sandwiched isolator configuration to enhance bonding strength and facilitate electrical connections, ensuring long operational lifetime and maintaining resonance integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If robust electrical connections are made to the actuator in two-cavity pump designs, then electrical connection reliability is improved, but resonance disruption and motion damping occur
Solution Approach 1:
The patent introduces an isolator as an intermediary component between the actuator and the pump cavity walls. This isolator provides a mechanical interface that allows electrical connections to be made to the actuator while preventing the electrical connection structure from directly contacting and damping the actuator's oscillatory motion. The isolator acts as a mediator that transmits necessary forces while isolating harmful damping effects, thus maintaining resonance integrity while enabling reliable electrical connections.
2Reliability
If the bond strength between actuator and isolator is increased to ensure operational lifetime, then reliability is improved, but stress on bonds during operation increases
Solution Approach 1:
The patent designs the isolator with specific mechanical properties and bonding structures that anticipate and cushion the stresses that will occur during operation. The isolator is engineered to absorb and distribute the stresses generated during pump operation, preventing these stresses from concentrating on the bonds between the actuator and isolator. This beforehand cushioning approach allows the bonds to be sufficiently strong for reliability while preventing stress concentration that would lead to failure.
3Productivity
If the isolator is positioned to reduce damping of actuator motion, then resonance efficiency is improved, but electrical connection accessibility is reduced
Solution Approach 1:
The patent segments the isolator structure into distinct functional zones: one zone optimized for reducing damping of actuator motion (maintaining resonance efficiency) and another zone that provides accessibility for electrical connections. The isolator may include extended surfaces, mounting flanges, or accessible bonding areas that allow electrical connections to be made without compromising the damping-reducing positioning of the isolator relative to the actuator. This segmentation allows both requirements to be satisfied simultaneously.
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 provides a strong bond between the actuator and isolator, enables robust electrical connections, and maintains the efficiency and resonance of two-cavity pumps, enhancing their operational performance and manufacturability.
Implementation Method 1
a pump in which each pumping cavity is substantially a disc-shaped, cylindrical cavity having substantially circular end walls and a side wall and which operates via acoustic resonance of fluid within the cavity
Implementation Method 2
pressure oscillations within the pump cavity such that the fluid is compressed within one part of the cavity while the fluid is simultaneously expanded in another part of the cavity
Data Source
AI summary
A fluid pump comprising one or two cavities which, in use, contains a fluid to be pumped, the chamber or chambers having a substantially cylindrical shape bounded by first and second end walls and a side wall; an actuator which, in use, causes oscillatory motion of the first end wall(s) in a direction substantially perpendicular to the plane of the first end wall(s); and whereby, in use, these axial oscillations of the end walls drive radial oscillations of the fluid pressure in the main cavity; and wherein an isolator forms at least a portion of the first end wall between the actuator and the side wall and includes conductive tracks, wherein electrical connection is made to the actuator via the conductive tracks included within the isolator.