Orbital Pump Crowning for Stable Liquid Delivery
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Solution Overview
Problem
Orbital pumps experience significant variations in delivery volume flow due to process variations and manufacturing tolerances, leading to inconsistent operating behavior and tightness issues.
Innovation Solution
The introduction of a crowning at the interface between the membrane unit and the hydraulic housing, creating a radial gap of less than 360°, which stabilizes the delivery volume and enhances operating properties by providing a buffer volume and compensating for diameter tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manufacturing tolerances and process variations are present in conventional orbital pumps, then production is easier and more flexible, but delivery volume flow becomes inconsistent and operates properties vary significantly
Solution Approach 1:
The crowning creates a buffer volume between the membrane unit and hydraulic housing that compensates for dimensional variations. This pre-established cushioning space absorbs tolerances in membrane diameter and housing inner diameter, ensuring consistent delivery volume flow regardless of manufacturing variations.
Solution Approach 2:
The invention changes the geometric parameter of the housing inner surface by adding crowning, transforming it from a perfectly circular cross-section to an oval cross-section at the crowning location. This parameter change creates the buffer volume that stabilizes delivery against manufacturing tolerances.
2Stability of the object's composition
If a radial gap is created between membrane unit and hydraulic housing, then delivery volume stability improves, but tightness properties may deteriorate
Solution Approach 1:
The crowning creates a localized radial gap (buffer volume) only in specific circumferential regions where it is most beneficial for stabilizing delivery volume. The membrane unit maintains flat contact with the hydraulic housing in other regions, preserving tightness properties where needed while allowing volume stabilization where beneficial.
Solution Approach 2:
The interface between membrane unit and hydraulic housing is segmented into regions with different gap characteristics: regions with crowning create buffer volumes for stability, while regions without crowning maintain flat contact for tightness. This segmentation allows simultaneous optimization of both delivery stability and tightness.
3Stability of the object's composition
If the circumferential section with radial gap is extended to 360°, then delivery volume stability further improves, but delivery efficiency decreases due to increased leakage path
Solution Approach 1:
Instead of applying crowning over the full 360° circumference, the invention uses partial action by limiting the crowning to specific circumferential sections. This provides sufficient buffer volume for stability while minimizing the leakage path area, thereby maintaining delivery efficiency.
Solution Approach 2:
The crowning creates an asymmetric geometry in the hydraulic chamber, with the radial gap concentrated in specific circumferential regions rather than uniformly distributed. This asymmetric arrangement optimizes the balance between buffer volume for stability and leakage path minimization for efficiency.
Data Source
AI summary
In many pump types, in particular in orbital pumps, there is an optimization need with regard to the running characteristics, in particular with regard to parameters which relate to the delivery flow. What is provided is an orbital pump device for delivering liquid medium by a rotational movement including a hydraulic housing surrounding a hydraulic chamber in a fluid-tight manner at least one membrane unit which is arranged inside the hydraulic chamber in flat contact with an inner jacket surface of the hydraulic housing; and an inlet and an outlet provided in the hydraulic housing. At least one crowning is provided at the inner jacket surface and/or at the membrane unit such that a radial gap between the membrane unit and the inner jacket surface is defined by the crowning in a circumferential section of less than 360°, and in particular less than 180°.