Piezoelectric Micro-blower Flexible Mounting Vibration Isolation
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Solution Overview
Problem
Existing piezoelectric micro-blowers suffer from high energy loss due to vibration leakage from the vibrating plate to the outer case, leading to inefficient energy conversion and variable performance characteristics when mounted.
Innovation Solution
A piezoelectric micro-blower design featuring a vibrating plate with a piezoelectric element, an inner case, and an outer case connected by non-contacting portions that suppress vibration transmission, allowing for efficient energy conversion and reduced flow passage resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the inner case and outer case are connected with rigid wall portions, then structural strength is improved, but vibration transmission from inner case to outer case increases causing energy loss
Solution Approach 1:
The patent employs flexible bearing members (spring members) to connect the inner case and outer case, replacing rigid connections. These flexible elements allow the inner case to vibrate freely while preventing vibration transmission to the outer case, thus reducing energy loss while maintaining structural integrity through the flexible connection mechanism
2Productivity
If the vibrating plate is driven at high frequency, then flow rate is improved, but vibration leakage to outer case increases
Solution Approach 1:
The flexible bearing members act as intermediaries between the inner case and outer case. These bearing members are specifically designed to isolate vibration transmission while allowing the inner case to operate at high frequencies, thus enabling improved flow rate without the energy loss that would result from rigid connections transmitting vibrations to the outer case
3Stability of the object's composition
If the outer case is fixed to housing or substrate, then stability is improved, but vibration characteristics become variable
Solution Approach 1:
The patent segments the case structure into an inner case that can vibrate freely and an outer case that provides stable mounting. The flexible bearing members allow the inner case to be decoupled from the outer case, enabling the inner case to maintain consistent vibration characteristics regardless of how the outer case is fixed to the housing or substrate
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 reduces energy loss and maintains consistent performance characteristics by minimizing vibration leakage and utilizing the gap between cases as an inflow passage, enhancing airflow efficiency.
Implementation Method 1
a piezoelectric micro-blower is known as an air blower for effectively dissipating heat generated in a housing of a portable electronic apparatus or for supplying oxygen needed to generate electric power in a fuel cell. The piezoelectric micro-blower is a kind of a pump including a diaphragm that bends when a voltage is applied to a piezoelectric element
Implementation Method 2
the vibrating plate is driven in a bending mode by applying a voltage with a predetermined frequency to the piezoelectric element, so that compressible fluid is sucked into the central space through the gap and is discharged through the second opening
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
[Object] To provide a piezoelectric micro-blower from which vibration of a vibrating plate does not easily leak to the outside and with which energy loss can be reduced. [Solving Means] A piezoelectric micro-blower includes an inner case 1 to which a peripheral portion of a vibrating plate 2 including a piezoelectric element 20 is fixed such that a blower chamber 3 is formed between the inner case and the vibrating plate and an outer case 5 that covers an outer periphery of the inner case with a predetermined gap therebetween. The inner case 1 is elastically retained in the outer case 5 with a plurality of connecting portions 4. A first opening 11 is formed in a top plate portion 10 of the inner case 1 that faces a central portion of the vibrating plate, and a second opening 53 is formed in a top plate portion 52 of the outer case 5 that faces the first opening. A central space 6 is formed between the top plate portions 10 and 52, and fluid introduced from the outside is guided to the central space through the gap between the inner and outer cases. The vibrating plate 2 is driven in a bending mode so that air is sucked into the central space 6 and is discharged through the second opening 53. The connecting portions 4 suppress leakage of vibration of the vibrating plate 2 from the inner case 1 to the outer case 5, thereby reducing energy loss.