Depth-Triggered Submersible Actuator Using Piston Buckling
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Solution Overview
Problem
Existing underwater electro-mechanical actuators are limited by battery life, complexity, high cost, and potential environmental hazards due to electrical components and chemical leakage.
Innovation Solution
A submersible actuator utilizing depth-induced buckling with a closed internal chamber filled with compressible gas, where a piston translates inward upon reaching a threshold water pressure, triggering a linkage to initiate a physical process without electrical components, and featuring a pressure relief valve to manage pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electro-mechanical actuator with battery, motor, and complex components is used, then the actuator can be powered and controlled, but the device complexity increases, battery life limits useful life, and cost increases
Solution Approach 1:
The patent removes all electrical components (battery, motor, circuitry, pressure sensor) from the actuator system entirely. Instead, it uses a purely mechanical depth-actuated release mechanism where a spring-loaded latch holds a blocking element in place until water pressure at depth overcomes the spring force, automatically triggering the release without any electrical systems.
Solution Approach 2:
The actuator uses the environmental condition (water pressure at depth) directly to trigger the release mechanism. The spring-loaded latch self-activates when the external water pressure exceeds the spring force, eliminating the need for external power sources, sensors, or control systems to detect depth and initiate release.
2Reliability
If an electro-mechanical actuator with multiple components is used, then the actuator can function, but the cost increases
Solution Approach 1:
The patent employs simple, inexpensive mechanical components that can be manufactured at low cost. The spring-loaded latch, blocking element, and trigger mechanism are basic mechanical parts without expensive electrical components, making the overall device much cheaper to manufacture while maintaining reliable functionality.
3Power
If an electro-mechanical actuator with battery is used, then the actuator can be powered, but environmental harm increases due to chemical leakage
Solution Approach 1:
The patent completely extracts the battery and all electrical power systems from the device. The mechanical spring-loaded mechanism requires no power source, eliminating the risk of chemical leakage and environmental contamination from battery materials while still achieving the desired actuation function through pure mechanical means.
4Device complexity
If a simple mechanical release mechanism is used, then the device complexity reduces, but the control precision over release timing may worsen
Solution Approach 1:
The patent uses a spring-loaded latch mechanism where the release timing is precisely controlled by adjusting spring force parameters and geometric dimensions. The release occurs when external water pressure exceeds the spring force, providing predictable and repeatable timing based on depth-pressure relationships without requiring complex electronic control systems.
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 solution eliminates the need for batteries, reduces complexity and cost, and minimizes environmental impact by using a simple, durable design that can be reused multiple times.
Implementation Method 1
a closed internal chamber that is occupied by a compressible gas (e.g. air)... When the outside water pressure reaches a threshold value, the pressure sensor (not shown) communicates with the on-board circuitry 12 to cause the electric motor 13 to be energized by the battery 14
Implementation Method 2
The piston is configured to translate inward into the chamber when a threshold pressure is applied to its second side by the water acting on it
Data Source
AI summary
An actuator configured to be submerged into a body of water and to activate upon achieving a particular depth. The actuator includes a housing that defines a chamber. The housing has an open end portion in which is located a piston, the piston closing the open end portion to cause the chamber to be watertight. The piston has a first side facing an inner wall of the chamber and a second side opposite the first side that is configured to face the body of water, the piston being translatable in the chamber. A column located inside the chamber has a first end coupled to the first side of the piston and a second end coupled the inner wall of the chamber, the column being configured to buckle upon a predetermined amount of force being applied to the second side of the piston to cause the piston to translate.