Cross-flow wave making pump with outer rotor motor
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Solution Overview
Problem
Existing wave making pumps with inner rotor brushless motors suffer from low torque, leading to uneven flow and dead zones with insufficient liquid circulation, as they require high rotation speeds to achieve high flow velocity, resulting in inefficient liquid circulation in containers.
Innovation Solution
A cross-flow wave making pump design featuring an impeller shell with two impeller assemblies and an outer rotor motor, which includes a ceramic shaft and vanes, allowing for high torque and efficient liquid circulation by forming a static pressure difference and continuous water flow through the impeller, reducing dead zones and enabling flexible pump positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If inner rotor brushless motor with propeller-type axial vanes is used, then rotation speed is high, but torque is low and outlet area is small, causing uneven flow and dead zones
Solution Approach 1:
The patent inverts the traditional motor configuration by using an outer rotor brushless motor instead of an inner rotor motor. This inversion allows the rotor to be located on the outer periphery, increasing the moment arm and thus the torque output. The motor drives the impeller assembly through a shaft, creating a static pressure difference that generates continuous water flow without dead zones, while maintaining high rotation speed capability.
2Productivity
If inner rotor brushless motor with centrifugal vanes is used, then liquid is swallowed and extruded, but outlet area is small and rotation speed must be increased for high flow velocity, causing uneven flow
Solution Approach 1:
The impeller assembly is segmented into multiple impellers (first impeller and second impeller) with各自的 vanes, driven by a common shaft. This segmentation allows the liquid flow to be divided into multiple streams that combine to create uniform overall flow. The multiple impellers work simultaneously to push water through the outlet, ensuring even distribution and eliminating dead zones while maintaining high flow rate.
3Speed
If high rotation speed is used to increase flow rate, then flow velocity increases, but torque requirement increases and causes uneven flow and dead zones
Solution Approach 1:
By inverting the motor configuration to outer rotor, the patent achieves higher torque at the same rotation speed, or equivalently, higher rotation speed for the same torque requirement. The outer rotor design increases the moment arm, allowing the motor to generate sufficient torque to drive large-sized impellers at high speeds without causing uneven flow or dead zones.
4Speed
If small-sized vanes are used with inner rotor motor, then rotation speed can be maintained, but outlet area is small and liquid circulation is insufficient
Solution Approach 1:
The patent uses multiple impellers with各自的 vanes instead of a single small impeller. This segmentation allows the total outlet area to be significantly increased while each individual impeller can maintain optimal size and rotation speed. The combined effect of multiple impellers provides both high rotation speed capability and large outlet area for sufficient liquid circulation.
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 cross-flow wave making pump achieves sufficient liquid circulation and significantly reduces dead zones by utilizing high torque from the outer rotor motor to drive large-sized impellers, ensuring continuous flow and efficient liquid movement in containers, regardless of pump positioning.
Implementation Method 1
utilizing high torque from the outer rotor motor to drive large-sized impellers
Implementation Method 2
forming a static pressure difference and continuous water flow through the impeller
Data Source
AI summary
This invention relates to a cross-flow wave making pump comprising an impeller shell forming a water intake and a water outlet, an impeller assembly pivotally connected to two ends of the impeller shell, and a motor used for driving the impeller assembly; wherein, the impeller assembly comprises an impeller used for driving a liquid flow, a first turntable and a second turntable respectively fixed at two ends of the impeller, wherein the first turntable is provided with a shaft rotatably mounted in the impeller shell, the second turntable is provided with a cavity used for receiving a rotor shaft of the motor. The embodiments of the present invention can provide a sufficient liquid-circulation in a container, and significantly reduce the dead zone where the liquid flows extremely slowly. Other embodiments are disclosed.