Magnetic Actuator-Membrane Coupling for Droplet Generation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electronic spray devices with vibrating perforate membranes face challenges in efficiently transmitting vibration energy from the actuator to the membrane while allowing for easy membrane separation and replacement, especially in compact devices where low power consumption and minimal size are critical, particularly with bending-mode actuators which are more prone to damping and energy absorption.
Innovation Solution
A magnetic connection using a support structure with at least one permanent magnet or ferromagnetic material to attach the actuator to the perforate membrane, allowing efficient vibration transmission while enabling easy membrane removal and replacement, minimizing energy absorption, and maintaining vibrational amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the actuator is directly bonded to the membrane, then vibration energy transmission is efficient, but the membrane cannot be easily separated or replaced
Solution Approach 1:
The device is divided into separable components: the actuator assembly and the membrane assembly. The membrane can be detached from the actuator, allowing easy replacement while maintaining efficient vibration transmission when connected. This segmentation enables independent optimization of each component.
Solution Approach 2:
The connection between actuator and membrane transitions from static (permanent bonding) to dynamic (separable magnetic connection). The magnetic force provides sufficient coupling during operation for efficient energy transmission, while allowing easy separation when needed, adapting the connection state to operational requirements.
2Ease of operation
If a magnetic connection is used to attach the actuator to the membrane, then the membrane can be easily removed and replaced, but vibration energy transmission may be insufficient
Solution Approach 1:
The traditional mechanical bonding system (adhesives, welds, mechanical fasteners) is replaced with a magnetic field-based connection system. This substitution enables non-contact or minimal-contact coupling that maintains vibration energy transmission while allowing easy separation and reconfiguration.
Solution Approach 2:
The magnetic field strength and positioning parameters are optimized to ensure sufficient coupling force for effective vibration transmission. By adjusting magnetic parameters (strength, distance, orientation), the system achieves both easy separability and efficient energy transfer without mechanical bonding.
3Use of energy by moving object
If the actuator mass is minimized to reduce power consumption, then energy efficiency improves, but the ability to transmit sufficient vibration energy to the membrane may be compromised
Solution Approach 1:
Magnetic coupling replaces mechanical mass-based coupling, allowing efficient energy transmission without requiring heavy actuators. The magnetic field directly couples the actuator to the membrane, transmitting vibration energy effectively while keeping actuator mass minimal for low power consumption.
Solution Approach 2:
The system uses composite construction with the actuator, magnetic coupling elements, and membrane optimized as an integrated system. This composite approach allows lightweight design while maintaining sufficient vibration transmission capability through optimized material selection and structural configuration.
4Loss of energy
If a bending-mode actuator is used to deliver vibrational energy, then efficiency increases and thin low-cost actuators can be used, but the actuator becomes more prone to damping and energy absorption
Solution Approach 1:
The magnetic coupling acts as an intermediary between the bending-mode actuator and the membrane. This intermediary connection reduces direct mechanical constraints on the actuator, minimizing damping and energy absorption while maintaining effective vibration transmission to the membrane.
Solution Approach 2:
The dynamic magnetic connection allows the bending-mode actuator to operate with greater freedom, reducing mechanical constraints and damping effects. The separable nature of the magnetic coupling enables the actuator to vibrate more freely while still effectively driving the membrane.
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 solution enhances the efficiency of droplet production by reducing energy dissipation, minimizing actuator mass, and maintaining high vibrational amplitude, making it suitable for compact, low-power devices and consumer applications.
Implementation Method 1
magnetic force is used to connect the actuator to the membrane so that the vibration can be transmitted
Data Source
Figure 1(a)~2(d)
Figure 3(a)~4(c)
Figure 5~6
AI summary
A liquid droplet production apparatus comprising a perforate membrane (33,39), a means for supplying liquid to one side of the membrane, an actuator (31) for vibrating the membrane said vibration causing liquid droplets to be ejected from the other side of the membrane, in which magnetic force is used to connect the actuator to the membrane so that the vibration can be transmitted.