Compander Pinion Layout for Thrust Balance and Lower Mechanical Loss
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Solution Overview
Problem
Conventional companders face challenges in reducing thrust and mechanical loss in power generation systems using supercritical CO2, particularly due to uneven pressure distribution and interference between compressors and expanders, leading to inefficiencies and increased mechanical losses.
Innovation Solution
The compander design arranges compressors and expanders on pinion gears such that pressure and temperature gradients are balanced, allowing for similar pressure distribution on both sides of the bull gear, reducing thrust and enabling the use of a consistent seal mechanism, and positions them to minimize interference with the generator, thereby canceling out power consumption and generation on each pinion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If compressors and expanders are arranged on pinion gears in a conventional IG compander, then power transmission is achieved, but thrust imbalance and mechanical losses increase
Solution Approach 1:
The patent combines compressors and expanders on the same pinion gear assembly, merging their mechanical functions into a unified structure. This integration allows the opposing thrust forces from compressors and expanders to counterbalance each other, reducing net thrust on the bull gear and minimizing mechanical losses in the power transmission system
Solution Approach 2:
The patent employs asymmetric arrangement of compressors and expanders on the pinion gears, positioning them to optimize thrust distribution. By strategically placing components with different pressure ratios and thrust characteristics on opposite sides, the design achieves thrust balance while maintaining efficient power transmission to the generator
2Force
If thrust is reduced using shrouded impellers or eye seals, then bearing load decreases, but device complexity increases
Solution Approach 1:
The patent uses the thrust force from expanders as a counterweight to offset the thrust force from compressors. By positioning expanders and compressors on opposite sides of the pinion gear, their opposing thrust forces naturally balance each other, eliminating the need for complex thrust reduction mechanisms like shrouded impellers or eye seals
3Force
If pressure distribution is balanced on both sides of the bull gear, then thrust is reduced, but arrangement complexity increases
Solution Approach 1:
The patent merges compressors and expanders into a single pinion gear assembly, creating a compact integrated unit. This combined arrangement naturally balances pressure distribution on both sides of the bull gear by positioning high-pressure and low-pressure components symmetrically, achieving thrust reduction without requiring separate complex arrangement 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
This design significantly reduces thrust imbalance, allows for the use of a uniform seal mechanism, and achieves a substantial reduction in mechanical losses, enhancing the efficiency of the power generation system by over 40% and improving overall system performance.
Implementation Method 1
a first pinion member comprising least one first pinion provided on one side of the bull gear; and a second pinion member comprising at least one second pinion provided on the other side of the bull gear
Data Source
AI summary
A compander comprises a bull gear connected to a generator a first pinion member comprising at least one first pinion provided on one side of the bull gear; and a second pinion member comprising at least one second pinion provided on the other side of the bull gear, wherein a first compressor and a first expander are mounted on the first pinion of the first pinion member, and a second compressor and a second expander are mounted on the second pinion of the second pinion member.