Shutter System Using Modular SMA Spring Actuator for Thermal Control
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Solution Overview
Problem
Existing thermal control devices in mechanical systems, such as motor vehicles, are complex and costly, requiring simplification to enhance reliability and reduce costs while maintaining effective temperature regulation.
Innovation Solution
A shutter system utilizing a shape-memory alloy (SMA) spring actuator mechanism that moves a grille to control airflow based on ambient temperature, with bias springs and hot and cold stops to prevent over-travel, allowing for modular design and improved assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional thermal control devices are used, then temperature regulation is achieved, but device complexity and cost increase
Solution Approach 1:
The patent replaces traditional mechanical actuators (motors, solenoids) with a shape memory alloy (SMA) spring that uses thermal expansion and phase transformation to directly actuate the shutter. This eliminates complex mechanical linkages, gears, and control systems while maintaining reliable temperature-regulated airflow control. The SMA spring expands or contracts in response to temperature changes, directly opening or closing the shutter aperture.
Solution Approach 2:
The SMA spring actuator is self-regulating, responding automatically to temperature changes without external control signals or power sources. The material's inherent phase transformation properties enable it to autonomously adjust the shutter position based on ambient temperature, eliminating the need for control electronics, sensors, or external actuators.
2Reliability
If traditional thermal control devices are used, then temperature regulation is achieved, but cost increases
Solution Approach 1:
The patent replaces expensive mechanical actuators (motors, solenoids, control electronics) with a shape memory alloy (SMA) spring that uses thermal expansion and phase transformation to directly actuate the shutter. This eliminates complex mechanical linkages, gears, and control systems while maintaining reliable temperature-regulated airflow control. The SMA spring expands or contracts in response to temperature changes, directly opening or closing the shutter aperture.
Solution Approach 2:
The SMA spring actuator uses a simple, inexpensive material (shape memory alloy wire) that can be manufactured at low cost through standard metalworking processes. The actuator has no moving parts, electronics, or complex components that would increase manufacturing complexity or cost, making it an economical solution for automated thermal control.
3Device complexity
If SMA spring actuator is used, then device complexity is reduced, but actuation force control becomes challenging
Solution Approach 1:
The patent combines the SMA spring actuator with a traditional mechanical spring to create a hybrid actuation system. The mechanical spring provides continuous contact force and helps control the shutter's movement, while the SMA spring provides temperature-dependent actuation force. This merging of two simple spring mechanisms achieves reliable force control without adding complexity.
Solution Approach 2:
The mechanical spring acts as an intermediary between the SMA spring and the shutter, mediating the force transmission. As the SMA spring expands or contracts in response to temperature changes, the mechanical spring translates this dimensional change into controlled rotational motion of the shutter, ensuring smooth and controlled actuation throughout the range of motion.
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 SMA spring actuator system simplifies thermal control by automatically adjusting airflow based on temperature, enhancing reliability and reducing complexity and costs through a lightweight, solid-state actuation mechanism.
Implementation Method 1
a shape-memory alloy (SMA) spring actuator mechanism that moves a grille to control airflow based on ambient temperature
Implementation Method 2
comprising a first bias spring and a first shape-memory alloy (SMA) spring, the first actuator mechanism configured to move the grill between the open position and the closed position
Data Source
AI summary
A shutter system for use in a vehicle. The shutter system comprises a panel mounted on a conduit through which air flows, the panel having a first plurality of apertures for permitting air to flow therethrough; and a grille movably mounted on a surface of the panel, the grille having a second plurality of apertures for permitting air to flow therethrough. In an open position, the grille is aligned with the panel such that the first and second plurality of apertures are aligned to permit air to flow through both the first and second plurality of apertures. In a closed position, the grille is aligned with the panel such that the first and second plurality of apertures are not aligned and air is blocked from flowing through the first and second plurality of apertures. The shutter system comprises a first actuator mechanism coupled to the panel and the grille and comprising a first bias spring and a first shape-memory alloy (SMA) spring. The first actuator mechanism moves the grill between the open position and the closed position.