Thermal Actuator Reset Speed via Segmented Design
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Solution Overview
Problem
Conventional thermal actuator arrangements face challenges in rapid resetting and achieving a defined de-energized position due to material properties and cooling rates, which affect their performance in applications requiring quick emergency shutdowns and precise positioning.
Innovation Solution
A thermal actuator arrangement comprising a first and second partial actuator with thermal and spring elements, where the actuating element is held in one position by a holding force and moved to another position by counterforces, allowing for independent positioning movements without relying on cooling time, and featuring end stops for a defined reset position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If thermal actuator elements are used for rapid positioning, then positioning speed is improved, but reset time increases due to cooling requirements
Solution Approach 1:
The actuator is divided into two independent partial actuators (first and second) that can operate independently. The first partial actuator handles positioning while the second handles resetting, allowing simultaneous operation and eliminating the sequential wait time for cooling.
Solution Approach 2:
The second thermal actuator element is pre-positioned and ready to immediately provide the holding force needed for resetting. When the first actuator completes positioning, the second actuator can immediately begin the reset operation without waiting for the first actuator to cool down.
2Ease of operation
If restoring force is applied to activated thermoelastic element, then reset is achieved, but material degradation increases
Solution Approach 1:
Instead of applying restoring force to the activated (contracted) first actuator element for reset, the invention inverts the approach by using the second actuator element to actively push the actuating element back to its initial position. This avoids the harmful expansion of the already-stressed first actuator element.
3Adaptability or versatility
If conventional antagonistic actuator arrangements are used, then bidirectional actuation is achieved, but defined reset position is not ensured
Solution Approach 1:
The second partial actuator with its spring element automatically provides the holding force needed to ensure the actuating element returns to and remains at the defined initial position. The system self-regulates to ensure precise reset positioning without additional control mechanisms.
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 design enhances reset speed and ensures a defined de-energized position, reducing material degradation and space requirements, while enabling quick transitions between positioning states without prolonged cooling-dependent delays.
Implementation Method 1
Thermal actuator arrangements are actuators with thermal actuator elements that can cause an actuating movement through the action of heat. Thermal actuator arrangements can, for example, be designed with thermoelastic actuator elements that have a thermoelastic material
Implementation Method 2
a first partial actuator with a first thermal actuator element which is subjected to a first counterforce; a second partial actuator with a second thermal actuator element which is subjected to a second counterforce
Data Source
Figure 1a~1c
Figure 2
Figure 3a~3c
AI summary
The invention relates to a thermal actuator arrangement (1) for moving an actuator (4) between a first actuating position (S1) and a second actuating position (S2), comprising: - a first partial actuator (2) having a first thermal actuator element (21), to which a first opposing force (F1) is applied; - a second partial actuator (3) having a second thermal actuator element (31), to which a second opposing force (F2) is applied, wherein the actuator elements (21, 31) are designed to modify their shape against the opposing force (F1, F2) in each case as a result of a temperature modification; - an actuator (4), which is coupled to the first partial actuator (2) such that, when the first actuator element (21) is deactivated, the actuator (4) is held in the first actuating position (S1) when a holding force takes effect and, when the holding force (H) is eliminated, the actuator (4) moves to the second actuating position (S2) due to the effect of the first opposing force (F1); - a safety element (5), which is coupled to the second partial actuator in order to provide the holding force (H) when the second actuator element (31) is in the deactivated state and to reduce or eliminate the holding force (H) when the second actuator element (31) is in the activated state.