Multistage Pump Impeller Inversion for Shaft Stability
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Solution Overview
Problem
Existing submersible pumps face limitations in rotation stability and efficiency due to the directional mounting of multistage impellers, leading to reduced lift capacity and poor cooling efficiency, which can result in increased energy consumption and mechanical damage from sediment in water sources.
Innovation Solution
A high-lift shielded permanent magnet multistage pump design featuring a motor assembly with a rotor shaft and multistage impellers mounted on both ends, enhanced with a thrust structure, sand throwing mechanism, and a control method using a PLC control unit for overcurrent protection and speed regulation, allowing for improved heat dissipation and sediment management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the number of impellers is increased to achieve higher lift, then the lift capacity is improved, but the rotation stability of the pump shaft deteriorates
Solution Approach 1:
The patent inverts the conventional single-directional mounting of impellers by arranging them in opposite directions on the pump shaft. Specifically, impellers are mounted alternately in upward and downward directions, creating a balanced configuration that counteracts rotational instability while maintaining high lift capacity through multiple impeller stages.
2Reliability
If submersible pumps are used for water cooling, then cooling function is provided, but the cooling effect is not optimal
Solution Approach 1:
The patent employs hydraulic principles by designing a water cooling system where cooling water flows through channels in the pump housing and motor assembly. This hydraulic cooling approach efficiently removes heat from the motor and bearing components, significantly improving cooling effectiveness compared to conventional submersible pump designs.
3Productivity
If the pump operates in water with sediment, then water lifting function is maintained, but the load on motor increases and mechanical parts become jammed
Solution Approach 1:
The patent converts the harmful effect of sediment into a beneficial function by incorporating a sand throwing mechanism. This mechanism uses the pump's own water flow to throw sediment away from critical mechanical parts, transforming the problematic sediment into a manageable element that does not cause jamming or excessive motor load.
4Ease of manufacture
If multistage impellers are mounted on pump shaft in one direction, then assembly is simplified, but rotation stability decreases and operation becomes unstable
Solution Approach 1:
The patent segments the impeller arrangement into distinct directional groups, with impellers mounted in alternating directions along the pump shaft. This segmentation creates balanced force distributions that improve rotational stability while maintaining reasonable assembly complexity through standardized mounting procedures.
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 design achieves increased lift capacity, improved efficiency, and energy savings by ensuring stable rotation and effective sediment handling, while the control method prevents motor damage and maintains optimal operation.
Implementation Method 1
motor assembly includes a motor barrel, a stator, a rotor and a rotor shaft
Implementation Method 2
shielded permanent magnet multistage pump
Implementation Method 3
A waterway cavity is formed between the pump shell and the motor barrel
Implementation Method 4
improved heat dissipation
Implementation Method 5
multistage impellers mounted on both ends
Implementation Method 6
high-lift shielded permanent magnet multistage pump
Implementation Method 7
A graphite sleeve is provided in the axle hole, and a ceramic coating matching the graphite sleeve is provided on the rotor shaft
Implementation Method 8
thrust structure includes an upper friction plate, a lower friction plate
Data Source
AI summary
A high-lift shielded permanent magnet multistage water pump includes a pump shell, a motor assembly and an impeller. The motor assembly includes a motor barrel, a stator, a rotor and a rotor shaft. The pump shell is sleeved on an outside of motor barrel. An upper and a lower connection base for fixing the motor barrel is provided in the pump shell. A waterway cavity is formed between the pump shell and motor barrel. An upper and a lower impeller cavities are respectively formed at an upper and a lower ends of the pump shell. The lower impeller cavity, water passing cavity and upper impeller cavity are in sequential fluid communication. Both ends of the rotor shaft with an axel provided on pass through the upper and the lower connection bases respectively. The impeller is a multistage structure and mounted on the axle at both ends respectively.