Submersible Centrifugal Pump Motor Casing Compartment Design
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Solution Overview
Problem
Conventional centrifugal pumps, especially submersed and submersible types, face reliability issues due to wear and tear of mechanical seals under hydraulic pressure, leading to liquid leakage and vibration-induced misalignment, which compromises their functionality and requires costly maintenance.
Innovation Solution
The design incorporates an open compartment that spaces the motor casing from the hollow body containing the impeller, utilizing hydraulic sealing means with a sealing chamber and O-ring gaskets to maintain a lower pressure region, reducing the risk of liquid leakage and minimizing vibrations by positioning the shredder closer to the liquid intake, thus enhancing the hydraulic seal and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical seals are used to seal the shaft passage between the motor and pump body, then hydraulic seal is achieved, but the seals wear over time and liquid leaks into the motor
Solution Approach 1:
The patent extracts the mechanical seal from the system by eliminating the need for a shaft passage through the motor casing. The motor casing is designed as a closed structure with no opening for the shaft, completely removing the seal component that was causing wear and leakage problems over time.
Solution Approach 2:
The pump is divided into two separate compartments: a dry compartment containing the motor and a wet compartment containing the impeller and pumping liquid. These compartments are completely isolated from each other, with the shaft rotating within the wet compartment without penetrating into the dry compartment, thus segmenting the system to eliminate seal requirements.
2Ease of operation
If the shredder is positioned far from the motor, then liquid intake is facilitated, but vibrations affect the motor and bearings causing misalignment and seal failure
Solution Approach 1:
The patent extracts the shredder into a separate location within the wet compartment, positioning it at the lower region away from the motor. This allows the shredder to process solids effectively without transmitting vibrations to the motor and bearings, as the shaft rotation and shredding operations are decoupled from the motor mounting structure.
3Device complexity
If the motor casing is positioned close to the hollow body, then device complexity is reduced, but hydraulic pressure causes seal wear and liquid leakage
Solution Approach 1:
The patent extracts the shaft passage through the motor casing entirely. The motor casing is designed as a closed, pressure-resistant structure that does not require openings or seal interfaces with the wet compartment, eliminating the source of hydraulic pressure-induced seal wear and leakage.
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 solution ensures a longer lifespan of the centrifugal pump by preventing liquid leakage and reducing vibrations, allowing for the installation of a shredder or mixing screw without additional devices, while maintaining the hydraulic seal and fluidizing the liquid without upstream agitators, thus reducing maintenance costs and operational complexity.
Implementation Method 1
hydraulic sealing means between said open compartment and said motor casing
Implementation Method 2
centrifugal pump of the submersed or submersible type comprising a hydraulic part, with a hollow body inside which there is at least one impeller
Data Source
AI summary
A centrifugal pump, of the submersed or submersible type, includes a hydraulic part, with a hollow body inside which there is at least one impeller, a motor enclosed within a motor casing that isolates the motor from the pumping liquid, adapted to drive the impeller in rotation via a rotation transmission shaft. The centrifugal pump further includes an open compartment that spaces the motor casing from the hollow body that contains the at least one impeller and hydraulic sealing elements between the open compartment and the motor casing.