Grooved Thrust Bearings With NTE Material for Axial Load Balancing
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Solution Overview
Problem
Existing thrust bearings in centrifugal pumps are unable to efficiently balance axial thrusts at varying rotational speeds, leading to oscillating axial movements and potential damage to pump components due to unequal forward and aft axial loads.
Innovation Solution
Implementing a bearing system with negative thermal expansion coatings in grooves to maintain spacing between impeller shaft and thrust bearings, reducing axial movement and frictional losses, and incorporating a lubricating circuit to support axial thrusts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional thrust bearings are used in centrifugal pumps, then the pump can operate with standard bearing components, but the axial thrusts cannot be efficiently balanced at varying rotational speeds, leading to oscillating axial movements and potential damage to pump components
Solution Approach 1:
The patent applies parameter changes by incorporating negative thermal expansion (NTE) materials in the bearing components. These materials change their physical dimensions in response to temperature variations, allowing the bearing to adapt its internal clearances and contact characteristics dynamically. This enables the bearing to efficiently balance axial thrusts across varying rotational speeds by adjusting its geometric parameters based on thermal conditions, thereby resolving the contradiction between reliable bearing operation and adaptability to different operating conditions.
Solution Approach 2:
The patent utilizes composite materials by combining traditional bearing materials with negative thermal expansion (NTE) materials. This composite structure allows the bearing to exhibit both the mechanical strength of conventional materials and the adaptive dimensional stability of NTE materials. The composite construction enables efficient axial thrust balancing at varying speeds while maintaining overall bearing reliability and structural integrity.
2Device complexity
If bearings operate without spacing maintenance, then the structure is simpler, but axial movement increases causing frictional energy losses and component wear
Solution Approach 1:
The patent employs parameter changes through NTE materials that dynamically adjust their dimensions based on temperature. This automatic adjustment maintains optimal spacing between bearing components and the impeller shaft across varying operating conditions. By changing their physical parameters in response to thermal effects, the NTE materials prevent excessive axial movement and reduce frictional energy losses without requiring complex external control mechanisms, thus resolving the contradiction between structural simplicity and energy efficiency.
3Device complexity
If axial movement is not controlled, then the bearing design is simpler, but component contact and wear increase, reducing maintenance intervals
Solution Approach 1:
The patent applies parameter changes by using NTE materials that automatically adjust their dimensional parameters in response to temperature variations. This self-adjusting mechanism maintains consistent spacing between bearing components, minimizing contact and wear during operation. The dynamic parameter adjustment extends maintenance intervals by reducing component degradation while keeping the overall bearing design relatively simple, thus resolving the contradiction between design simplicity and durability.
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 reduces axial movement and frictional energy losses, enhancing pump efficiency and extending maintenance intervals by minimizing component contact and wear.
Implementation Method 1
the NTE material shrinks in response to the impeller shaft moving relative to at least one of the radial bearing, windage heating, or contact with moving surrounding thermal fluid
Data Source
AI summary
Bearings with grooves and methods of producing the same are disclosed. Examples disclosed herein include a bearing having a bearing surface with a groove, the bearing positioned adjacent to a shaft, the groove facing the shaft, and a negative thermal expansion (NTE) material positioned in the groove, the NTE material at least partially filling the groove.