Rotary Pump Sealing Element with Base Leakage Cross-Section
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Solution Overview
Problem
Rotary pumps face challenges in maintaining accurate delivery volume and pressure due to changes in sealing gap widths caused by temperature, wear, and production tolerances, leading to fluid leakage and shifts in down-regulation onset.
Innovation Solution
Incorporating a sealing element with base leakage cross-sections that compensate for changes in sealing gap widths, independent of temperature and wear, to maintain a predetermined pressure level, and using a hydraulic pressing device to ensure reliable sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing gaps are made tighter to reduce fluid leakage, then sealing performance improves, but the sensitivity to temperature changes and wear increases, causing delivery volume inaccuracies
Solution Approach 1:
The patent introduces a compensation mechanism that actively adjusts the sealing gap width by changing the position of the actuating member based on detected leakage or pressure deviations. This dynamic parameter adjustment compensates for temperature expansion and wear, maintaining both tight sealing and accurate delivery volume without requiring extremely precise manufacturing tolerances.
2Adaptability or versatility
If the pump is regulated down using control fluid, then delivery volume is reduced, but the down-regulation onset pressure shifts with temperature and wear
Solution Approach 1:
The patent employs a feedback mechanism where sensors detect the actual pressure and delivery volume, and this information is used to adjust the control fluid pressure or actuating member position. This closed-loop control ensures that the down-regulation onset occurs at the intended pressure level regardless of temperature changes or wear, maintaining reliable and consistent pump regulation.
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 solution effectively maintains accurate pressure delivery and reduces fluid leakage, ensuring consistent performance across varying conditions and extending the lifespan of the pump.
Implementation Method 1
In order to compensate for changes in the gap width of the axial sealing gaps, a base leakage cross-section is provided on the sealing element, through which control fluid can flow off from the control pressure space to a low-pressure side of the pump
Implementation Method 2
a pressing device for generating a pressing force which acts on the sealing element and presses it into the sliding contact
Implementation Method 3
to which a control fluid is applied in one direction of its mobility and a restoring force is applied counter to the control fluid force exerted by the control fluid
Data Source
AI summary
A rotary pump with an improved seal on a control pressure chamber, including: a housing having a delivery chamber; a feed wheel rotatable in the delivery chamber; an actuating member surrounding the feed wheel forming delivery cells and moveable in the housing relative to the feed wheel. The control pressure chamber is delineated by the actuating member together with axially facing axial co-operating surfaces, forming an axial sealing gap and a radial sealing gap. A control fluid can be introduced into the control pressure chamber for applying pressure to the actuating member to exert an actuating force in the actuating direction; a restoring device for generating a restoring force; and a sealing element arranged on the actuating member or the circumferential co-operating surface. To compensate for a change in gap width of one of the axial sealing gaps, a base leakage cross-section is provided on the sealing element.