Multistage Centrifugal Pump Compression Bulkhead Diffuser Stability
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Solution Overview
Problem
Submersible pumping systems face issues with diffusers spinning within the pump housing due to metal fatigue, temperature variances, and mechanical shock, which reduce the compressive force applied by the pump head, leading to inefficiencies and potential fluid loss in high-pressure applications.
Innovation Solution
A multistage centrifugal pump design featuring an upstream and downstream housing with a compression bulkhead that applies compressive force to the diffusers, dividing the pump into manageable sections to prevent diffuser rotation, using threaded engagements and compression sleeves to maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a long threaded engagement is used to accommodate aggregate compression, then the compressive force is maintained, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The pump housing is divided into multiple sections with compression bulkheads positioned between them. Each bulkhead independently applies compressive force to the diffusers in its section, segmenting the long compression task into multiple shorter, manageable sections. This reduces the required threaded engagement length while maintaining adequate compression force on each diffuser stage.
2Stability of the object's composition
If the pump head applies compressive force to prevent diffuser rotation, then diffuser stability is improved, but metal fatigue and temperature variances reduce the captured compression over time
Solution Approach 1:
The compression bulkheads are pre-loaded during assembly to establish the necessary compressive force on the diffusers before the pump begins operation. This preliminary compression ensures that the diffusers are securely positioned and resistant to rotation from the outset, compensating for the fact that some compression will be lost over time due to metal fatigue and thermal cycling.
3Productivity
If the pump is designed for high pressure applications, then productivity is improved, but the down thrust created by pump stages may overcome the compressive force applied by the pump head
Solution Approach 1:
By dividing the pump into multiple sections with intermediate compression bulkheads, the down thrust generated by each stage is counterbalanced more effectively. Each bulkhead provides localized compression that resists the cumulative down thrust, allowing the pump to achieve high pressure output without sacrificing diffuser stability.
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 effectively maintains diffuser stability, reduces the risk of rotation, and enhances the pump's operational efficiency by distributing compressive force more evenly across the pump stages, improving performance in high-pressure environments.
Implementation Method 1
A compression bulkhead is connected between the second end of the upstream housing and the first end of the downstream housing. The compression bulkhead applies a compressive force to the diffusers within the upstream housing.
Implementation Method 2
After the stages have been placed into the housing, the pump head is threaded onto the housing to apply the compressive force to the stack of diffusers.
Data Source
AI summary
A multistage centrifugal pump includes an upstream housing and a downstream housing. The upstream housing and the downstream housing each have a first end, a second end and a plurality of turbomachinery stages. Each of the plurality of turbomachinery stages includes a diffuser and an impeller. A compression bulkhead is connected between the second end of the upstream housing and the first end of the downstream housing. The compression bulkhead applies a compressive force to the diffusers within the upstream housing.