Brittle-Material Circulation Pump With Gas Pressure Cavitation Control
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Solution Overview
Problem
Existing fluid handling systems, particularly in thermal batteries, face challenges in efficiently pumping high-temperature liquids like liquid tin at high flow rates while maintaining mechanical stability and preventing cavitation.
Innovation Solution
The proposed solution involves a centrifugal sump pump designed with a shaft assembly and impeller made from brittle materials like graphite, which includes a unique bearing design with grooves for lubrication and a gas-liquid interface to control pressure and prevent cavitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials are used for the impeller and shaft assembly, then mechanical strength is sufficient, but cavitation occurs and mechanical stability deteriorates at high temperatures
Solution Approach 1:
The patent changes the material parameter from conventional metals to brittle materials (graphite, ceramic composites) that maintain structural integrity at high temperatures and resist cavitation. This material parameter change enables operation in high-temperature environments while preventing cavitation damage that would occur with conventional materials.
Solution Approach 2:
The patent employs composite material structures, particularly graphite-based composites and ceramic matrix composites, that combine the benefits of high-temperature stability and cavitation resistance. These composite materials provide both the mechanical strength needed for structural integrity and the cavitation-resistant properties required for reliable high-temperature operation.
2Productivity
If high flow rates are achieved through increased impeller speed, then productivity improves, but mechanical stability and cavitation resistance worsen
Solution Approach 1:
The patent optimizes impeller geometric parameters including blade angle, blade curvature, and hub diameter ratios to achieve high flow rates without excessive rotational speeds. The impeller design incorporates specific dimensional relationships that maintain mechanical stability while maximizing productivity, allowing high flow rate operation without the cavitation and instability that would result from simply increasing speed.
3Reliability
If brittle materials are used for the impeller and shaft assembly, then cavitation resistance improves, but ease of manufacture worsens
Solution Approach 1:
The patent divides the pump into separable components with the brittle material impeller and shaft assembly as distinct modules. This segmentation allows each component to be manufactured separately using appropriate processes for brittle materials, then assembled into the complete pump system. The modular approach reduces manufacturing complexity by enabling specialized fabrication techniques for each component rather than requiring monolithic construction.
Solution Approach 2:
The patent introduces a coupling mechanism that serves as an intermediary between the motor shaft and the brittle material impeller shaft. This coupling component accommodates the different material properties and manufacturing requirements of the brittle material components while maintaining reliable power transmission. The intermediary coupling allows brittle material components to be manufactured and assembled separately, simplifying the overall manufacturing process.
4Reliability
If liquid material pressure is increased to prevent cavitation, then cavitation resistance improves, but energy consumption increases
Solution Approach 1:
The patent optimizes the pressure distribution parameters within the pump system by designing the impeller to create favorable pressure gradients that prevent cavitation without requiring excessive overall pressure increases. The impeller blade geometry and pump chamber design work together to maintain pressures above the cavitation threshold throughout the pumping process, achieving cavitation resistance with minimal energy penalty.
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 enables efficient pumping of high-temperature liquids at high flow rates, maintains mechanical stability, and prevents cavitation, thereby extending the pump's lifespan and reducing maintenance needs.
Implementation Method 1
The liquid material may be delivered to a gap between the shaft assembly and the bearing via capillary action
Implementation Method 2
An inner surface of the cooling component may be black and able to absorb thermal radiation from the shaft assembly
Implementation Method 3
pumping a liquid material by rotating an impeller
Data Source
AI summary
Aspect of the disclosure provides a method of pumping a liquid material. The method may include pumping the liquid material by rotating an impeller attached to a shaft assembly. The pump includes the impeller, the shaft assembly, and a pump chamber. The method includes controlling the minimum pressure of the liquid material in the pump chamber to be above a threshold pressure by controlling a pressure of a gas that is supplied to the pump chamber. The shaft assembly includes a first shaft and a second shaft that are separated by a gap and are physically coupled by a coupling component.