Inner-Outer Rotor Pump Assembly With Self-Adjusting Radial Gap
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pumps face challenges in achieving high efficiency and stability under high pressure while maintaining reduced weight and cost, particularly in the vehicle sector where fuel consumption and cost pressures are significant.
Innovation Solution
A pump unit design with an inner and outer rotor configuration, where the outer rotor aligns concentrically with the housing bore, reducing the radial gap through a hydrodynamic bearing condition, and utilizing a pressure gradient to generate a directed force, enhancing efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the radial gap between outer rotor and inner rotor is reduced to increase efficiency, then pumping efficiency increases, but manufacturing precision requirements worsen
Solution Approach 1:
The pump unit employs a self-regulating mechanism where the hydraulic operating principle automatically adjusts the radial gap through the spacing of the outer rotor from the reference point of the housing. The system uses its own operating fluid and pressure to maintain optimal clearance without external intervention or complex control systems.
Solution Approach 2:
The invention changes the positional parameter of the outer rotor relative to the housing reference point, creating a predetermined offset that optimizes the radial gap. This parameter adjustment allows the system to achieve smaller effective clearance while accommodating normal manufacturing tolerances.
2Loss of energy
If the radial gap is reduced to improve efficiency at high pressures, then energy efficiency increases, but device complexity increases
Solution Approach 1:
The housing bore is designed with asymmetric geometry relative to the outer rotor, creating a predetermined offset that generates a directed force. This asymmetric design produces a self-centering effect that maintains optimal radial gap without requiring additional balancing mechanisms or complex control systems.
Solution Approach 2:
The invention utilizes hydraulic principles where the operating fluid under pressure generates forces that act on the outer rotor. The pressure gradient between different regions of the housing bore creates a directed force that positions the outer rotor optimally, reducing radial gap through fluid pressure rather than mechanical constraints.
3Productivity
If the outer rotor is positioned eccentrically to reduce radial gap, then pumping efficiency improves, but stability under high pressure worsens
Solution Approach 1:
The system creates a self-regulating feedback mechanism where the hydraulic pressure and directed forces continuously act to maintain the optimal position of the outer rotor. Any deviation from the predetermined spacing triggers hydraulic forces that restore the optimal radial gap, ensuring stable performance under varying pressure conditions.
Solution Approach 2:
The invention transitions from a static clearance design to a dynamic self-adjusting system. The outer rotor position is not fixed but continuously adjusted by hydraulic forces that respond to operating conditions, allowing the system to maintain optimal radial gap dynamically during operation rather than relying on precise static manufacturing.
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 achieves increased efficiency and stability by reducing the radial gap, allowing for higher pressure operation with improved manufacturing tolerances and cost-effectiveness.
Implementation Method 1
the outer rotor aligns concentrically with the housing bore, reducing the radial gap through a hydrodynamic bearing condition
Implementation Method 2
utilizing a pressure gradient to generate a directed force, enhancing efficiency and stability
Data Source
Figure 1
Figure 2~4
AI summary
The invention relates to a pump unit (10) comprising an inner rotor (12), an outer rotor (14), and a housing (16), wherein the inner rotor (12) has a predetermined position (18) relative to the housing (16), the predetermined position (18) being configured to space a rotation axis (20) of the outer rotor (14) apart from a reference (22) of the housing (16), so that a radial gap (24) between the outer rotor (14) and the inner rotor (12) is reduced, wherein the pump unit (10) is configured to pump a fluid by rotating the inner rotor (12) and/or the outer rotor (14).