Split Power Gerotor Pump Wobble Cancellation
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Solution Overview
Problem
Gerotor pumps with integrated motors face challenges in efficiently managing wobble and fluid flow due to the complex interaction between the inner and outer gerotors, leading to suboptimal pumping performance and fluid distribution.
Innovation Solution
The design incorporates an inner gerotor, a wobble cancellation element, and an outer gerotor, where the outer gerotor is free to float and translates rotationally when the wobble cancellation element is rotated, while the inner gerotor is fixed, allowing for efficient fluid pumping by aligning and misaligning fluid ports and depressions to create suction and pressure volumes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If an integrated motor and pump design is used, then the device can be compact and self-contained, but wobble management becomes complex and pumping performance deteriorates
Solution Approach 1:
The pump is divided into functionally independent inner and outer gerotor components. The inner gerotor handles fluid intake and the outer gerotor handles fluid discharge, with each component optimized for its specific function. This segmentation allows the complex integrated design to maintain reliable pumping performance while remaining compact.
Solution Approach 2:
A wobble cancellation element is introduced as an intermediary component between the inner and outer gerotors. This element specifically addresses the wobble issue in integrated motor-pump designs by canceling out rotational irregularities, thereby maintaining pumping performance despite the compact integrated configuration.
2Device complexity
If the outer gerotor is fixed relative to the inner gerotor, then structural simplicity is maintained, but fluid flow management efficiency deteriorates
Solution Approach 1:
The outer gerotor is designed to float and translate rotationally relative to the inner gerotor during operation. This dynamic configuration allows the fluid ports and depressions to align and misalign in sequence, creating efficient suction and pressure volumes that enhance fluid flow management while maintaining relatively simple structure.
3Speed
If fluid ports are continuously open, then fluid flow is uninterrupted, but pumping efficiency deteriorates due to loss of pressure differential
Solution Approach 1:
The fluid ports are designed to periodically align and misalign with the depressions as the outer gerotor translates rotationally. This periodic action creates alternating suction and pressure phases that maintain pressure differential for efficient pumping while ensuring continuous fluid flow through the cyclic opening and closing of fluid pathways.
Data Source
AI summary
A gerotor pump includes an inner gerotor, a wobble cancellation element, and an outer gerotor disposed radially between the inner gerotor and the wobble cancellation element. The inner gerotor includes a first outer peripheral surface with n first lobes equally spaced from one another in a circumferential direction, and n first depressions, each disposed between an adjacent pair of first lobes. The inner gerotor and the wobble cancellation element are coaxial. The wobble cancellation element includes a first inner peripheral surface with n+1 second lobes equally spaced from one another in the circumferential direction, and n+1 arcuate surfaces, each arranged between an adjacent pair of second lobes. The outer gerotor includes a second outer peripheral surface including n+1 outer depressions complementary to and arranged to engage the second lobes, and a second inner peripheral surface comprising n+1 inner depressions complementary to and arranged to engage the first lobes.