Diaphragm Pump Bonding Strength via Surface Segmentation
Solution Overview
Problem
Diaphragm pumps experience a decrease in bonding strength between the diaphragm and the supporting member due to high-frequency vibration, which affects the accuracy and efficiency of fluid intake and discharge.
Innovation Solution
A diaphragm pump design that incorporates a space between the diaphragm and the supporting member, with the diaphragm surfaces facing this space and bonding to the supporting member through a second surface not connected to the first surface, reducing the effect of vibration on bonding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the diaphragm is bonded directly to the supporting member at the vibration surface, then the structure is simple and compact, but the bonding strength decreases due to high-frequency vibration
Solution Approach 1:
An electrode plate is introduced as an intermediary component between the piezoelectric member and the diaphragm. This electrode plate serves as a mediator that transmits the driving force while preventing direct bonding of the vibration surface to the supporting member, thereby reducing the detrimental effect of high-frequency vibration on bonding strength while maintaining structural simplicity.
Solution Approach 2:
The bonding interface is segmented into two distinct surfaces: a first surface (vibration surface) that does not bond to the supporting member and a second surface that bonds to the supporting member. This segmentation separates the vibration-prone area from the bonding area, allowing the diaphragm to vibrate freely while maintaining stable bonding at the second surface.
2Ease of operation
If the outer peripheral edge of the electrode plate separates from the joint portion, then the diaphragm can vibrate freely, but the bending deformation increases and bonding strength decreases
Solution Approach 1:
Different regions of the diaphragm are assigned different functions: the first surface (vibration surface) is designed to move freely with bending deformation, while the second surface is designed for stable bonding to the supporting member. This local differentiation allows free vibration where needed while maintaining bonding strength where required.
Solution Approach 2:
The bonding interface is moved from the vibration surface (first surface) to the opposite surface (second surface) of the diaphragm. This dimensional transition allows the vibration to occur on one surface while the bonding occurs on the opposite surface, effectively decoupling the vibration motion from the bonding interface.
3Productivity
If the diaphragm vibrates with high frequency for fluid pumping, then the pumping efficiency is improved, but the bonding strength between diaphragm and supporting member decreases
Solution Approach 1:
The electrode plate acts as a mediator that enables high-frequency vibration for efficient pumping while protecting the bonding interface from the detrimental effects of this vibration. The intermediary component transmits the vibrational energy needed for pumping without transferring the bonding-degrading effects to the supporting member interface.
Solution Approach 2:
By moving the bonding interface to the second surface opposite to the vibration surface, the patent creates a spatial separation between the high-frequency vibration zone and the bonding zone. This allows the diaphragm to vibrate with high amplitude and frequency for efficient pumping while the bonding interface remains relatively stable.
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 prevents a decrease in bonding strength, ensuring stable and accurate fluid flow by minimizing the impact of diaphragm vibration on the bonding interface.
Implementation Method 1
a piezoelectric member that is deformed when a voltage is applied
Data Source
AI summary
A diaphragm pump includes a piezoelectric member, a diaphragm having surfaces, and a supporting member. The piezoelectric member deforms when a voltage is applied. The diaphragm deforms in response to deformation of the piezoelectric member. The supporting member supports the diaphragm. A space is formed between the diaphragm and the supporting member. Fluid is made to flow by changing a volume of the space by deforming the diaphragm. The surfaces of the diaphragm face the space and include a first surface that deforms in response to deformation of the piezoelectric member and include a second surface not connected to the first surface. The diaphragm bonds to the supporting member with the second surface.