Piezoelectric Pump Segmented Housing for Pressure Stability
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Solution Overview
Problem
Piezoelectric pumps experience performance deterioration due to pressure fluctuations occurring outside the pump chamber, which reduce flow rate, suction pressure, and discharge pressure, and enlarging the space to mitigate this often leads to increased device size and potential pressure resonance.
Innovation Solution
The design incorporates a housing with a divided internal space, featuring a first and second chamber separated by the vibrating bodies and a peripheral wall, with strategically positioned communication ports and concave portions to minimize external pressure fluctuations, allowing the vibrating bodies to operate effectively without increasing device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the space outside the pump chamber is enlarged to reduce pressure fluctuation interference, then pump performance improves, but device size increases
Solution Approach 1:
The housing internal space is segmented into a first chamber and a second chamber separated by the vibrating bodies and peripheral wall. The first chamber is positioned closer to the first vibrating body while the second chamber is closer to the second vibrating body, creating distinct pressure zones that reduce interference with the pump chamber pressure fluctuations.
Solution Approach 2:
The peripheral wall portion acts as an intermediary structure connecting the first and second vibrating bodies while defining the pump chamber boundaries. This peripheral wall creates a controlled space configuration that mediates between the vibrating bodies and the housing walls, reducing direct pressure transmission to the vibrating bodies.
2Productivity
If the space outside the pump chamber is enlarged, then pressure fluctuation interference decreases, but pressure resonance may occur
Solution Approach 1:
Different regions of the housing are designed with different spatial characteristics. The first chamber and second chamber have different volumes and positions relative to the vibrating bodies, creating local quality variations that disrupt pressure resonance patterns while maintaining adequate space to reduce pressure fluctuation interference.
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 configuration enhances pump performance by reducing external pressure interference, thereby increasing flow rate and pressure efficiency without enlarging the device, as demonstrated by various modifications and verification tests.
Implementation Method 1
a piezoelectric pump using a piezoelectric element as a driving body for driving a vibrating body... an AC voltage having a predetermined frequency is applied to the piezoelectric element to drive the vibrating plate at a resonant frequency
Implementation Method 2
drive the vibrating plate at a resonant frequency, thereby generating pressure fluctuation in the pump chamber to enable suction and discharge of fluid
Data Source
AI summary
A pump includes a housing, a first vibrating body, a second vibrating body, and a peripheral wall portion that define a pump chamber, and a driving body. The housing has a first wall portion opposed to the first vibrating body and a second wall portion. The first wall portion includes a first concave portion that opens toward the first vibrating body and opposed to a central portion of the first vibrating body and a first circumferential portion adjacent to the first concave portion. A first chamber includes a first wide portion defined by the first concave portion and the first vibrating body, and a first narrow portion defined by the first circumferential portion and the first vibrating body. The first narrow portion overlaps with at least part of the first vibrating body.