Rotary Piston Pump Framework with Polymer Fill
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Solution Overview
Problem
Rotary lobe pumps experience high wear when pumping particle-laden liquids due to particles getting trapped between pistons or the housing wall, leading to delamination of the rubber layer and reduced sealing efficiency, which compromises manufacturing accuracy and delivery efficiency.
Innovation Solution
A rotary piston design featuring a framework arrangement of spaced-apart plates partially filled and encased with polymer material, providing a stable connection and reducing the risk of delamination, with the polymer material covering the outer surface and the inner opening reserved for torque transmission to maintain precision and prevent elastic influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the rubber layer is increased to improve wear resistance, then delamination resistance is improved, but manufacturing accuracy and dimensional precision are reduced
Solution Approach 1:
The rotary piston is constructed as a composite structure with a metal framework (spaced-apart plates) providing structural precision and a polymer/rubber material filling the spaces to provide wear resistance. This composite approach allows each material to contribute its superior properties without suffering the drawbacks of using it alone - the metal framework maintains dimensional accuracy while the polymer provides delamination-resistant wear protection.
Solution Approach 2:
The rotary piston is segmented into a framework structure composed of multiple spaced-apart plates rather than a solid monolithic structure. This segmentation creates void spaces that are filled with polymer material, effectively creating a composite structure that combines the precision of metal framework with the wear-resistant properties of polymer material.
2Reliability
If a rubber layer is applied to the rotary piston to counteract wear, then wear resistance is improved, but the rubber layer can detach and tear under particle pressure
Solution Approach 1:
The invention uses a composite structure where polymer material fills the spaces within the metal framework. This distributed composite structure eliminates the delamination problem by integrating the polymer within the framework rather than applying it as a surface layer that can detach under particle pressure.
Solution Approach 2:
The polymer material is strategically placed within the framework structure where it provides wear resistance at the housing wall interface, while the metal framework provides structural strength and precision. Each material is positioned where it best performs its function, creating localized optimization of properties.
3Manufacturing precision
If a thin rubber layer is used to maintain manufacturing precision, then dimensional accuracy is improved, but wear resistance and delamination protection are reduced
Solution Approach 1:
The composite structure allows the use of a thin polymer layer within the framework, maintaining dimensional accuracy similar to a thin coating, while the distributed nature of the polymer within the framework structure provides enhanced wear resistance and delamination protection compared to a thin surface layer.
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 enhances wear resistance, reduces delamination, and maintains manufacturing accuracy, resulting in improved abrasion resistance and reduced weight, while minimizing material costs and production complexity.
Implementation Method 1
a rotary piston for a rotary piston pump, which has a framework arrangement comprising several spaced-apart plates and the framework arrangement is at least partially filled and at least partially encased with a polymer material
Implementation Method 2
the spacer elements are produced by angular deformation of a portion of the plate
Data Source
Figure 1
Figure 1a
Figure 2
AI summary
The invention relates to a rotary piston pump comprising a housing with a housing interior, an inlet opening, and an outlet opening; a first rotary piston which is mounted within the housing interior in a rotational manner about a first rotational axis; and a second rotary piston which is mounted within the housing interior in a rotational manner about a second rotational axis. The first rotary piston and the second rotary piston engage into each other in a region between the first and the second axis and displace liquid. The first rotary piston has a frame assembly which comprises multiple mutually spaced plates and is at least partly filled and coated with a polymer material.