Gerotor Pump Radial Compensation for Leakage Reduction
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Solution Overview
Problem
Conventional gerotor pumps suffer from tooth tip play between the inner and outer rotors due to production tolerances, leading to inefficiency and increased leakage during operation.
Innovation Solution
The implementation of a gerotor pump design with radial compensation using radially displaceable pressure elements that form secondary pressure regions, which press the outer rotor against the inner rotor, reducing the gap between them and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional gerotor pumps are designed with standard production tolerances, then manufacturing costs are reduced and ease of manufacture is improved, but tooth tip play occurs between inner and outer rotors leading to increased leakage and decreased pump efficiency
Solution Approach 1:
A radially displaceable pressure element is introduced as an intermediary component between the inner and outer rotors. This pressure element responds to pressure differences across it by displacing radially to compensate for tooth tip play, thereby reducing leakage without requiring tighter manufacturing tolerances on the rotors themselves.
Solution Approach 2:
The pressure element is designed to be radially displaceable rather than fixed, allowing it to dynamically adjust its position in response to changing pressure conditions during pump operation. This dynamic adjustment enables continuous compensation for tooth tip play across varying operating conditions.
2Loss of energy
If production tolerances are tightened to reduce tooth tip play, then pump efficiency is improved, but manufacturing costs increase and ease of manufacture deteriorates
Solution Approach 1:
The pressure element serves as a compensating intermediary that absorbs the effects of production tolerances. By placing this active compensation mechanism between the rotors, the system can maintain high efficiency with standard manufacturing tolerances, avoiding the need for costly tight-tolerance machining.
Solution Approach 2:
The pressure element automatically compensates for tooth tip play through its own displacement driven by the pressure differential across it during normal pump operation. This self-acting mechanism eliminates the need for external adjustment mechanisms or complex control systems.
3Power
If the pump operates at higher pressures, then productivity and power output are improved, but the tooth tip play gap enlarges due to pressure effects leading to increased inner leakage
Solution Approach 1:
The radially displaceable pressure element dynamically responds to increasing operating pressures by adjusting its radial position. As pressure increases during high-power operation, the pressure element displaces to maintain optimal clearance, preventing the gap enlargement that would otherwise occur and the associated increase in leakage.
Solution Approach 2:
The pressure element creates a feedback mechanism where the pressure differential across it during operation directly drives its compensating displacement. This automatic feedback response ensures that leakage is counteracted in proportion to the operating pressure, maintaining efficiency across the full pressure range.
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 design significantly increases the efficiency of the gerotor pump by reducing the tooth tip play and inner leakage, allowing the pump to operate effectively in higher pressure ranges with improved performance stability and reduced production costs.
Implementation Method 1
During operation of the gerotor pump, the pressure elements bear on the housing so that pressure chambers are formed between the outer rotor and housing and/or between the outer rotor and the pressure elements
Implementation Method 2
From these pressure chambers there is produced during operation of the pump a force which presses or urges the outer rotor radially against the inner rotor. This effect is also referred to as 'radial compensation'
Data Source
AI summary
The invention relates to a gerotor pump for conveying a fluid from an inlet pump chamber which is connected to an inlet to an outlet pump chamber which is connected to an outlet of the gerotor pump, having a rotatable outer rotor; a rotatable inner rotor which is arranged radially inside the outer rotor, wherein the inner rotor and the outer rotor have rotation axes which are different from each other; a housing having a housing space, in which the outer rotor and the inner rotor are received; and; and a plurality of radially displaceable pressure elements which are arranged on an outer circumference of the outer rotor and which during operation bear on the housing so that between the outer rotor and housing and/or between the outer rotor and the pressure elements pressure chambers which are connected in fluid terms to the inlet pump chamber and/or to the outlet pump chamber are formed. The invention further relates to a motor/pump unit having the gerotor pump.