Two-Cavity Disc Pump Isolator Design for Bond Stress Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Acoustic resonance pumps with disc-shaped cavities face challenges in maintaining efficient fluid pumping due to bond stress and difficulties in achieving robust electrical connections without disrupting resonance or damping motion, especially in two-cavity designs.
Innovation Solution
A two-cavity pump design with a disc-shaped actuator and ring-shaped isolator, where the isolator is supported by the side wall and extends from the actuator's periphery to the side wall, forming a strong bond and facilitating robust electrical connections through integrated electrodes, while maintaining minimal damping of the actuator's motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a disc-shaped actuator is used in a two-cavity acoustic resonance pump, then the pump can achieve fluid pumping through radial pressure oscillations, but bond stress increases and operational lifetime decreases
Solution Approach 1:
A ring-shaped isolator is introduced as an intermediary component between the disc-shaped actuator and the pump body. This isolator reduces bond stress by providing a compliant mounting interface that accommodates thermal expansion and mechanical stress, thereby preventing bond failure while maintaining the actuator's oscillatory motion for fluid pumping
2Extent of automation
If electrical connections are added to the actuator, then the actuator can be driven, but resonance disruption and motion damping occur
Solution Approach 1:
The ring-shaped isolator functions as a flexible mounting structure that provides electrical connection pathways while maintaining mechanical compliance. This flexible design allows electrical signals to reach the actuator without creating rigid constraints that would dampen the actuator's oscillatory motion or disrupt the acoustic resonance within the cavities
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 design enhances the operational lifetime of the pump by reducing bond stress and maintaining acoustic resonance, achieving increased flow and pressure efficiency with improved electrical connectivity.
Implementation Method 1
the actuator and the isolator provide a common end wall forming a first cavity and a second cavity with the end walls... the actuator operatively associated with a central portion of the common end wall and adapted to cause an oscillatory motion of the common end wall... thereby generating radial pressure oscillations of the fluid within both the first cavity and the second cavity
Data Source
Figure 1~2
Figure 3~4
Figure 5A~5B
AI summary
A two-cavity pump (10) has a side wall (22) closed by two end walls (12,19) for containing a fluid. An actuator (40) is disposed between the two end walls (12,19) and functions as a portion of a common end wall (21) of the two cavities (16,23). The actuator (40) causes an oscillatory motion of the common end wall (21) to generate radial pressure oscillations of the fluid within both cavities (16,23). An isolator (30) flexibly supports the actuator (40).