Self-adjusting Drum Radial Bush for Pump Leakage
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Solution Overview
Problem
Existing centrifugal pump systems face challenges in maintaining optimal bearing life and reducing fluid leakage through the clearance between the balancing drum and bushing arrangement, which affects pump efficiency and reliability.
Innovation Solution
A self-adjusting drum system with a balancing drum mounted on a central shaft, a fixed stationary structure, and a bush element that can move radially or tilt to achieve a hydrostatically centered position, minimizing clearance for efficient fluid film formation and reducing leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the radial clearance between the balancing drum and bushing arrangement is reduced to minimize fluid leakage, then pump efficiency is improved, but the bearing function and reliability deteriorate due to insufficient clearance
Solution Approach 1:
The bush element is designed to be movable radially within the annular gap rather than fixed, allowing it to dynamically adjust its position based on operating conditions. This dynamic adjustment enables the clearance to optimize between bearing support and leakage prevention, resolving the contradiction between minimizing fluid leakage and maintaining reliable bearing function
Solution Approach 2:
The bush element automatically adjusts its radial position based on the fluid pressure and load conditions without external control. The system self-regulates the clearance to provide optimal bearing characteristics and minimize leakage automatically, eliminating the need for manual adjustment while maintaining both reliability and efficiency
2Reliability
If manual adjustments are made to optimize bearing characteristics, then bearing durability is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The bush element automatically adjusts its radial position based on operating conditions without requiring manual intervention or complex control systems. This self-adjusting mechanism maintains optimal bearing characteristics and durability while eliminating the complexity and maintenance burden of manual adjustment systems
Solution Approach 2:
The system incorporates implicit feedback through the fluid pressure and load conditions that automatically influence the radial position of the bush element. This feedback mechanism enables the system to self-optimize bearing characteristics based on real-time operating conditions without requiring external monitoring or control
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 system enhances bearing durability and pump efficiency by automatically adjusting to provide minimum clearance for free rotation, reducing fluid leakage while maintaining high bearing capacity without manual adjustments.
Implementation Method 1
Fluid in the clearance forms a thin film that performs a useful bearing function, like a film of lubricant formed on a journal bearing
Implementation Method 2
a bush element arranged in said annular gap so as to leave clearance with respect to said inner and/or outer surfaces; and fixing means for fixing said bush element to said stationary structure so as to lock the bush element against movement along the axial direction and allow it to freely move along a radial direction and/or allow it to tilt with respect to the axial direction
Data Source
AI summary
A self-adjusting drum system for use with a pump or similar rotating machinery includes a balancing drum mounted on a central shaft for joint rotation therewith. The shaft extends along an axial direction and the balancing drum has an outer surface. A fixed, stationary structure surrounding the balancing drum is provided. The stationary structure has an inner surface arranged so as to face the outer surface of the balancing drum, and an annular gap is provided therebetween. A bush element is arranged in the annular gap so as to leave clearance with respect to the inner and/or outer surfaces. A fixing component is further provided for fixing the bush element to the stationary structure so as to lock the bush element against movement along the axial direction and allow it to freely move along a radial direction, inside the annular gap.