Magnetic Coupling Pump Rotor Inversion for Slippage Reduction
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Solution Overview
Problem
Magnetic coupling pumps are expensive and prone to slippage due to high starting torque requirements, making them unsuitable for cost-sensitive applications like swimming pool circulation pumps, and the increased energy efficiency standards further complicate their use with high-quality, copper-wound motors.
Innovation Solution
Reversing the assignment of inner and outer rotors, with the outer rotor connected to the pump shaft and the inner rotor to the drive motor, and adding weights to the inner rotor to increase its mass moment of inertia, reducing the risk of magnetic coupling failure during startup, while maintaining energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high-quality copper-wound motors are used to meet energy efficiency standards, then energy efficiency is improved, but starting torque increases causing magnetic coupling slippage
Solution Approach 1:
The patent inverts the conventional magnetic coupling pump design by placing the motor-driven rotor inside the containment shell (inner rotor with inner magnets) and the pump-driven rotor outside (outer rotor with outer magnets). This reversal allows the magnetic coupling to transmit torque from the inner rotor to the outer rotor, preventing slippage during motor startup while maintaining energy efficiency compliance.
2Power
If conventional outer rotor design is used, then magnetic coupling can transmit torque, but high starting torque causes slippage and unreliable operation
Solution Approach 1:
The patent reverses the conventional configuration where the motor-driven rotor is placed inside the containment shell and the pump-driven rotor is placed outside. This inversion allows the magnetic coupling to effectively transmit torque from the inner motor-driven rotor to the outer pump-driven rotor, preventing slippage during startup and ensuring reliable operation.
3Reliability
If magnetic coupling pumps are used, then hermetic sealing and leak-free operation are achieved, but production cost increases
Solution Approach 1:
The patent inverts the conventional magnetic coupling pump design configuration, placing the motor-driven rotor inside the containment shell and the pump-driven rotor outside. This design reversal enables hermetic sealing without shaft seals while using permanently magnetized rotors that can be produced more cost-effectively, reducing overall production costs.
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 reduces the risk of slippage and allows for cost-effective production of energy-efficient magnetic coupling pumps suitable for swimming pool circulation applications, ensuring reliable operation and compliance with energy efficiency standards.
Implementation Method 1
the drive unit and the pump shaft being in a magnetically operative connection with one another via inner and outer magnets which are separated from one another by a containment shell
Implementation Method 2
adding weights to the inner rotor to increase its mass moment of inertia, reducing the risk of magnetic coupling failure during startup
Data Source
Figure 1~2
Figure 3~6
Figure 7~10
AI summary
The invention relates to a pump for fluid media, in particular a circulation pump for swimming pools or bathing pools, comprising a pump housing (35), an impeller (19) arranged in the pump housing (35) and mounted non-rotatably on a pump shaft (22), a drive unit (27, 28) which can be connected to a drive motor (32), wherein the drive unit (24, 25, 27, 28) and the pump shaft (22) are in magnetic operative connection with each other via inner and outer magnets (25, 28) which are separated from each other by a containment shell (29), and the drive unit (24, 25, 27, 28) comprises an inner rotor (27) on which the inner magnets (28) are arranged and which can be non-rotatably connected to a motor shaft (21) of the drive motor (32), and an outer rotor (24) which is non-rotatably connected to the pump shaft, wherein the outer rotor (24) has the outer magnets (25) carries and encompasses the inner rotor (27), wherein the inner rotor (27) has additional weights (33) which act as a starting brake.