Moineau Pump Eccentric Shaft Alignment and Wear Reduction
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Solution Overview
Problem
Moineau pump-type quantitative liquid-discharging apparatuses face issues with rotor misalignment, leading to stator fatigue and wear, as well as difficulties in maintaining precise rotation and discharging liquids with high viscosity or containing particles, due to the sensitivity of the stator to operating environments and assembly states.
Innovation Solution
The apparatus features a stator with a slot hole designed to match the rotor, utilizing eccentric main shafts and slide bearings to guide the rotor's movement, ensuring precise alignment and minimizing wear, along with a coupling system for efficient rotation input transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a Moineau pump uses a rotor coupled to power transmission parts such as a universal joint and a flex shaft, then the pump can transmit rotation force, but the pump becomes sensitive to assembly and arrangement state, making operation and maintenance difficult
Solution Approach 1:
The patent removes the universal joint and flex shaft from the power transmission system. Instead, it uses a direct coupling mechanism where the drive shaft is directly connected to the rotor through a coupling device, eliminating the complex intermediate transmission parts that caused sensitivity to assembly and maintenance difficulties
Solution Approach 2:
The patent introduces a coupling device as a simplified intermediary between the drive shaft and rotor. This coupling device directly transmits rotation force without the complex mechanics of universal joints and flex shafts, reducing sensitivity to assembly state while maintaining power transmission capability
2Productivity
If the stator of a Moineau pump is pressed against the rotor to maintain quantitative discharge, then the pump can discharge liquids with various viscosities, but the stator is susceptible to fatigue and wear
Solution Approach 1:
The patent makes the pressing force between stator and rotor adjustable rather than fixed. The pressing force can be dynamically adjusted based on operating conditions such as liquid viscosity and discharge requirements, allowing optimal performance while reducing unnecessary wear under light-load conditions
Solution Approach 2:
The patent changes the pressing force parameter between stator and rotor from a fixed value to an adjustable range. By controlling the pressing force within an optimal range, the system maintains quantitative discharge capability for various liquid viscosities while minimizing stator fatigue and wear
3Volume of moving object
If a small Moineau pump is manufactured with reduced chamber volume, then the pump size is reduced, but it becomes difficult to secure torsional stiffness for precise rotation transmission
Solution Approach 1:
The patent employs composite material structures for the chamber and support components. By using materials with high stiffness-to-weight ratios or composite construction, the chamber can maintain small volume while providing sufficient torsional stiffness for precise rotation transmission
Solution Approach 2:
The patent optimizes the spatial arrangement and structural configuration of the chamber and support elements. By strategically positioning stiffening ribs, support brackets, or structural reinforcements in three-dimensional space, the design achieves adequate torsional stiffness without increasing overall chamber volume
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 stator wear and fatigue, enhances the precision of liquid discharge, and allows operation in a wider range of environments, while facilitating easy maintenance and replacement of the stator.
Implementation Method 1
a stator having a hollow and molded in a screw shape having two or more threads is coupled to a rotor which is paired with the stator and has a screw shape having threads of which the number is one smaller than that of the stator
Implementation Method 2
a center of a cross section of the rotor moves in a hypocycloid of an integer ratio determined by the number of threads of the screw shape of the stator
Implementation Method 3
first and second slide bearings to which the first shaft part and the second shaft part are rotatably coupled, respectively
Data Source
AI summary
The present invention relates to a Moineau pump-type quantitative liquid-discharging apparatus including a stator in which a slot hole is formed, a main shaft including a first shaft part and a second shaft part, which are eccentric with respect to each other, and a rotor which extends from the first shaft part and is inserted into the slot hole, first and second slide bearings to which the first shaft part and the second shaft part are rotatably coupled, respectively, and first and second sliders which guide the first and second slide bearings to move in directions to cross each other, wherein the movement directions of the first and second slide bearings are perpendicular to an extension direction of the rotor.