Pump Pressure Relief Using Thermal Actuation for Overheat Prevention
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Solution Overview
Problem
Conventional pump systems in aerospace applications face challenges in preventing excessive fluid temperature buildup due to pump failures, which can lead to high-temperature reactions of fuel, and existing solutions are complex, slow to react, and may have latent failures undetectable before usage cycles.
Innovation Solution
A pump system incorporating a thermally-responsive material that senses over-temperature events and cooperates with a fluid-operated control to decrease pump output pressure, ensuring no latent failures with a dormancy period greater than one usage cycle, and maintaining operational functionality after the material reaches its activation temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional temperature sensors and electrical solenoids are used for overheat prevention, then temperature monitoring capability is improved, but system complexity increases and response speed decreases
Solution Approach 1:
The patent replaces electrical temperature sensors and solenoid controls with a purely mechanical thermal expansion mechanism. The thermal element expands directly in response to temperature increases, mechanically actuating the pressure relief valve without requiring electrical components, software, or complex sensing systems. This mechanical substitution resolves the contradiction by eliminating the complexity and slow response inherent in electrical sensing and control systems.
Solution Approach 2:
The thermal element performs both sensing and actuation functions simultaneously through its own thermal expansion. The element that detects temperature rise is the same element that directly opens the pressure relief valve, eliminating the need for separate sensors, signal processing circuits, and control actuators. This self-service approach dramatically simplifies the system while maintaining fast response to overheating conditions.
2Measurement precision
If redundant temperature sensors and software controls are implemented, then temperature detection accuracy is improved, but response time to rapidly rising temperatures deteriorates
Solution Approach 1:
The patent replaces electrical sensing and software processing with direct mechanical response. The thermal element's expansion is instantaneous and proportional to temperature rise, providing both accurate temperature detection and immediate response without the delays inherent in electrical signal transmission, software processing, and actuator response times.
Solution Approach 2:
The thermal element continuously monitors temperature and provides continuous mechanical actuation of the pressure relief valve. As temperature rises, the element continuously expands, maintaining proportional pressure relief throughout the overheating event. This continuous mechanical action eliminates the discrete sampling and processing delays associated with electrical sensor systems.
3Speed
If mechanical pressure reduction mechanisms are used, then response speed to temperature changes is improved, but ability to detect latent failures before usage cycles deteriorates
Solution Approach 1:
The thermal element is pre-positioned and pre-loaded in such a way that any latent failure affecting its thermal expansion capability will manifest as an abnormal condition detectable before the next usage cycle. The element's mechanical connection to the pressure relief valve allows inspection of its position and functionality prior to operation, enabling detection of latent failures while maintaining fast response during actual overheating events.
4Manufacturing precision
If electrical solenoids and software control are used to reduce pump pressure, then precision of pressure control is improved, but system simplicity and reliability deteriorate
Solution Approach 1:
The patent replaces electrical solenoid-based pressure control with a mechanical thermal expansion mechanism. The thermal element's expansion directly modulates the pressure relief valve opening, providing precise pressure control through pure mechanical means. This eliminates electrical components, software control logic, and associated complexity while maintaining reliable pressure regulation in response to overheating.
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 effectively prevents excessive fluid temperature buildup by quickly responding to overheating events, reducing pump output pressure, and ensuring the system remains operational, thereby preventing high-temperature reactions and latent failures, with improved reliability and detection capabilities.
Implementation Method 1
the thermally-responsive material is in thermal communication with the fluid flowing through the pump system for effecting a change in temperature of the thermally-responsive material
Implementation Method 2
the thermally-responsive material is configured to have an activation temperature that causes a transformation of the material
Data Source
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AI summary
A pump system including a prevention mechanism for preventing excessive fluid temperature buildup of system fluid. The overheat prevention mechanism includes a thermally-responsive control component (130) made with a thermally-responsive material. The thermally-responsive control component is located in the pump system (112) such that the thermally-responsive material is in thermal communication with the system fluid for effecting a change in temperature of the thermally-responsive material. The thermally-responsive material is configured to have an activation temperature that is a predefined amount less than a maximum operating temperature of the system fluid. The thermally-responsive control component is configured to cooperate with a pump control mechanism in the system to decrease pump output pressure in response to the thermally-responsive material being heated by the fluid to a temperature that is equal to or greater than the activation temperature of the thermally-responsive material.