Gerotor Pump Rotor Profile Design for Throughput
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Solution Overview
Problem
Existing gerotor pumps face challenges in increasing throughput within a fixed footprint, while also being manufacturable with standard machining equipment, and maintaining mechanical integrity and efficiency.
Innovation Solution
The solution involves an outer rotor with a transformed circumferential contour, featuring a scale transformation or rotational transformation, and an inner rotor that rotates eccentrically within the outer rotor, forming a gerotor element that enhances volumetric flow capability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pump footprint is increased to increase throughput, then the volumetric flow capability is improved, but the fixed footprint requirement is violated
Solution Approach 1:
The patent applies dimensional transformation by creating a 3D transformed circumferential contour from a 2D original contour. The scale transformation and rotational transformation operations modify the contour in multiple dimensions (radial scale, axial scale, rotational angle) to increase chamber volumes and improve volumetric flow capability while maintaining the same pump footprint. This allows the pump to process more fluid per revolution without increasing its external dimensions.
2Productivity
If complex 3-D printing techniques are used to achieve transformed contours, then the volumetric flow capability is improved, but the manufacturing expense increases
Solution Approach 1:
The patent transforms the circumferential contour using mathematical parameter operations including scale transformation (modifying radial and axial dimensions by specific factors) and rotational transformation (rotating the contour by a specified angle). These parameter changes create optimized 3D geometries that improve volumetric flow capability while remaining manufacturable with standard machining equipment, avoiding the need for expensive 3-D printing processes.
3Productivity
If the circumferential contour is transformed to increase chamber volumes, then the volumetric flow capability is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent segments the circumferential contour modification into distinct transformation operations: scale transformation (applying scale factors to radial and axial dimensions) and rotational transformation (rotating the contour by a specified angle). This segmentation allows each transformation to be performed independently using standard machining operations, reducing overall manufacturing complexity while achieving the desired increased chamber volumes.
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 significantly increases the volumetric flow capability and efficiency of the pump by optimizing chamber volumes and reducing pumping losses, while maintaining mechanical integrity and being manufacturable with standard equipment.
Implementation Method 1
an inner rotor configured to rotate eccentrically within the outer rotor, thereby forming a gerotor element for a fluid pump
Data Source
AI summary
A fluid displacement pump having an inner body and an outer body. The inner body includes a first inner lobe profile having a first number of lobes with a first axial extent and a first radial extent; and a second inner lobe profile having the first number of lobes with a second axial extent and a second radial extent. The outer body includes a first outer lobe provide and a second outer lobe profile. The first outer lobe profile has a second number of lobes configured to engage with the first inner lobe profile. The second outer lobe profile has the second number of lobes configured to engage with the second inner lobe profile, where the second outer lobe profile is axially coextensive with the second inner lobe profile.