Vertical Multi-Stage Submersible Pump With Dual-Strainer Suction
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Solution Overview
Problem
Existing vertical multi-stage submersible pumps face issues such as clogging of the suction port due to foreign substances, damage to the mechanical seal from discharge pressure, and inefficient discharge flow paths that cause flow loss.
Innovation Solution
The pump design positions the motor part below the pump part, with a suction port above the motor, and incorporates a dual-strainer system and a conical suction flow path with guide vanes to prevent clogging and damage, while maintaining efficient fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the suction port is disposed adjacent to the bottom of the water tub, then the pump can easily suction fluid, but foreign substances or sediment are easily introduced into the suction port causing clogging
Solution Approach 1:
A strainer is introduced as an intermediary component between the suction port and the fluid source. The strainer filters out foreign substances and sediment while allowing water to pass through, preventing clogging of the suction port while maintaining efficient fluid suction capability
Solution Approach 2:
The suction port is repositioned from the bottom of the pump to the upper end of the pump casing. This spatial repositioning changes the suction direction from upward to downward or horizontal, allowing the pump to draw water from a higher level while the strainer prevents debris entry
2Reliability
If the mechanical seal is installed between the rotary shaft and casing to prevent fluid leak, then sealing is improved, but the mechanical seal is exposed to discharged fluid and directly receives high pressure causing damage and leakage
Solution Approach 1:
The mechanical seal is repositioned from the discharge side to the suction side of the pump. This spatial relocation changes the pressure environment from high-pressure discharge to low-pressure suction, reducing the stress on the mechanical seal while maintaining sealing effectiveness
Solution Approach 2:
A balance drum is introduced as an intermediary component between the mechanical seal and the fluid. The balance drum distributes and equalizes the pressure acting on the mechanical seal, preventing concentrated high pressure from damaging the seal while maintaining reliable sealing
3Device complexity
If the discharge flow path bypasses the motor part to discharge water above the pump, then the pump structure is maintained, but the discharge flow path has a bent structure causing flow loss and efficiency deterioration
Solution Approach 1:
The discharge port is repositioned from the lower discharge side to the upper end of the pump casing. This spatial repositioning creates a straighter, more direct discharge flow path that reduces bends and angles, minimizing flow loss and improving pump efficiency while maintaining the overall pump structure
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 reduces mechanical seal damage, minimizes flow loss, and enhances suction efficiency by preventing foreign substance ingress and stabilizing fluid flow, thus facilitating high-lift pumping with reduced maintenance costs.
Implementation Method 1
a plurality of impellers is connected to the rotary shaft and pumps the fluid in a stepwise manner while rotating together with the rotary shaft
Data Source
AI summary
A vertical multi-stage submersible pump include a motor part including a stator and a rotor installed in a motor casing, the motor part having a rotary shaft connected to the rotor, configured to rotate, and protruding upward from the motor casing, a water chamber casing assembled to an upper portion of the motor casing and including an oil seal and a mechanical seal configured to define a sealing structure around the rotary shaft, a suction casing assembled to an upper portion of the water chamber casing and having a suction port formed in a circumference of the suction casing so that a fluid is introduced into the suction port, the suction casing having a discharge port formed in a central portion of an upper surface of the suction casing, and a pump part.