Fluid Pump With External-Rotor Gear Drive for Viscous Liquids
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Solution Overview
Problem
Internal gear ring pumps are inefficient when pumping high-viscosity liquids due to the need for higher torque, which is not optimal for electric motors.
Innovation Solution
A fluid pump design incorporating an external rotor with toothing and a drive pinion that forms a transmission mechanism, allowing the electric motor to operate at high rotational speed with low torque, and includes an internal gear pump stage for additional efficiency and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the internal rotor is driven directly by the electric motor, then the motor operates at low rotational speed with high torque, but the efficiency of the pump decreases when pumping high-viscosity liquids
Solution Approach 1:
A drive pinion with toothing is introduced as an intermediary transmission element between the electric motor and the internal rotor. The pinion engages with the toothing on the external rotor, forming a gear transmission mechanism that converts the motor's high-speed low-torque output into the pump's required low-speed high-torque operation, thereby improving both motor efficiency and pump performance
2Use of energy by moving object
If a transmission mechanism is added to the pump, then the motor can operate at high rotational speed with low torque, but the device complexity increases
Solution Approach 1:
The transmission mechanism is merged with the pump structure by integrating the drive pinion into the external rotor assembly. The pinion's toothing is directly formed on the external rotor, combining the functions of the drive transmission and the pump housing into a single integrated component, thereby reducing overall device complexity while maintaining transmission functionality
Solution Approach 2:
The external rotor serves multiple functions: it acts as both the pump housing structure and carries the drive pinion toothing for transmission. This multi-functional design eliminates the need for separate transmission components, reducing complexity while achieving the desired motor operating conditions
3Volume of moving object
If the toothing on the external rotor is internal toothing, then the drive pinion can be positioned inside the external rotor for compact design, but the manufacturing precision requirements increase
Solution Approach 1:
The drive pinion is nested inside the external rotor, with its toothing engaging with the internal toothing of the external rotor. This nested arrangement allows the transmission mechanism to be contained within the pump housing, achieving a compact design where the pinion rotates within the internal cavity of the external rotor
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 enables efficient pumping of high-viscosity liquids with a compact and cost-effective configuration, using more efficient permanent magnets and achieving a higher volumetric flow.
Implementation Method 1
The drive pinion and the internal toothing of the external rotor can form an internal gear pump. The internal gear pump is in particular a gear mechanism which ensures a reduction in the rotational speed from the electric motor to the external rotor.
Implementation Method 2
an internal rotor located in the housing, and an external rotor which surrounds the internal rotor, is rotatably mounted in the housing and, together with the internal rotor, forms an internal gear ring pump
Data Source
AI summary
A fluid pump including a housing, an internal rotor located in the housing, and an external rotor which surrounds the internal rotor, is rotatably mounted in the housing and, together with the internal rotor, forms a internal gear ring pump. The external rotor is provided with a toothing with which a drive pinion meshes.