Pump Housing Pressure Equalization for Dredging Wear
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Solution Overview
Problem
Centrifugal pumps used in dredging operations face extreme wear and high pressures, leading to stress and potential breakage of the pump housing due to pressure differentials, particularly affecting the circumferential wall made of brittle wear-resistant materials like white cast iron.
Innovation Solution
The design incorporates first and second chambers with pressurizing means to equalize pressure between the pump interior and exterior, allowing a reduced wall thickness for the circumferential wall and using ductile materials for the pump casing and shaft cover to contain pressure, minimizing stress and wear on the pump housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If wear resistant materials like white cast iron are used for the circumferential wall, then wear resistance is improved, but the material becomes brittle and more susceptible to stress-induced breakage
Solution Approach 1:
A pressure equalization chamber is introduced as an intermediary element between the pump interior and exterior. This chamber receives pressurized fluid through a line and distributes it to equalize the pressure differential across the circumferential wall, thereby reducing stress on the brittle wear-resistant material and preventing stress-induced breakage while maintaining wear resistance
Solution Approach 2:
The pressure parameter across the circumferential wall is changed by introducing pressurized fluid into the equalization chamber. By adjusting the pressure of the fluid supplied to the chamber, the stress state of the brittle circumferential wall is modified, reducing the likelihood of breakage while preserving the wear-resistant properties of the material
2Strength
If the circumferential wall is made thicker to withstand high pressure, then strength is improved, but material usage and production cost increase
Solution Approach 1:
The pressure equalization chamber acts as a mediator that reduces the pressure differential across the circumferential wall. This allows the use of thinner circumferential walls with less material while maintaining adequate strength to withstand the reduced stress, thereby reducing material usage and production costs
Solution Approach 2:
By changing the pressure parameter through fluid injection into the equalization chamber, the required wall thickness parameter can be reduced. The pressurized fluid compensates for the reduced structural capacity of thinner walls, allowing optimization of material usage while maintaining pressure withstanding capability
3Strength
If connection means are positioned at outwardly position where circumferential wall is thick, then connection strength is improved, but bending moment in the circumferential wall increases
Solution Approach 1:
The pressure equalization chamber serves as a mediator that reduces the overall pressure differential and bending moment in the circumferential wall. This creates a more favorable stress state that allows connection means to be positioned optimally, balancing connection strength requirements with reduced bending moment in the wall
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 configuration significantly reduces stress on the pump housing, extends the lifespan of the circumferential wall, and minimizes material usage and production costs by allowing a thinner wall thickness while maintaining robustness against pressure surges.
Implementation Method 1
The design incorporates first and second chambers with pressurizing means to equalize pressure between the pump interior and exterior
Data Source
Figure 1a
Figure 1b
Figure 1c
AI summary
A pump housing comprises a circumferential wall forming an outer wall of the pump housing; a pump casing which connects to the circumferential wall on a first outer side to form a first chamber, the pump casing comprising a central opening to form an axial supply of the pump housing for material to be pumped; and pressurizing means to pressurize the first chamber.