Vane Cell Pump Side Surface Coating for Wear Resistance
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Solution Overview
Problem
Conventional positive-displacement pumps, such as vane cell pumps, experience reduced service life due to friction and potential damage from coatings coming loose during operation.
Innovation Solution
The side surfaces of the pump are coated only in areas where the contour ring abuts, using a harder material than the surfaces, with the coating applied via electrolysis to form a durable oxide layer, and strategically removing the coating from areas not needed to prevent damage and enhance sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the entire side surface within the contour ring is coated with a harder material, then friction resistance and service life are improved, but the coating may come loose and cause damage during operation
Solution Approach 1:
The patent applies coating only to specific local areas of the side surface where the contour ring abuts, rather than coating the entire surface. This localized coating approach provides friction resistance exactly where needed while avoiding the reliability issues of complete surface coating.
Solution Approach 2:
The side surface is divided into coated and uncoated zones based on functional requirements. The coating is segmented to apply only in the contact area with the contour ring, separating the functional zones of friction resistance and structural integrity.
2Strength
If a harder coating is applied to the side surface, then wear resistance is improved, but friction may still occur at uncoated contact areas
Solution Approach 1:
The harder coating material is applied specifically to the contact areas where the contour ring abuts on the side surface. This ensures wear resistance is enhanced precisely at the friction-prone zones while maintaining the benefits of localized treatment.
3Reliability
If the coating is applied only in a subarea of the contour ring contact zone, then coating integrity is improved, but sealing tightness may be compromised
Solution Approach 1:
The coating is applied to a subarea of the contour ring contact zone that is optimized to maintain both coating integrity and sealing function. The coating location and extent are carefully selected to provide structural reliability while preserving the necessary seal tightness.
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 approach increases the service life of the pump by reducing friction and preventing damage from loose coatings, while maintaining a tight seal and preventing the contour ring from working itself into the side plates, thus improving operational reliability.
Implementation Method 1
The coating is applied via electrolysis, also referred to as anodization or anodic oxidization, in which the workpiece to be coated is used as the anode and a lead plate, for example, is used as the cathode; both are inserted into a reaction space or are adjacent thereto. An electrolyte, e.g., diluted sulfuric acid, flows through the reaction space.
Implementation Method 2
The coating is preferably an oxide layer which is also referred to as an eloxal layer. The coating is applied via electrolysis, also referred to as anodization or anodic oxidization
Data Source
AI summary
In a preferred embodiment of the present invention, a positive-displacement pump, in particular a vane cell pump, having a pump element, in particular a rotor, which is situated within a contour ring and rotatable between two side surfaces where a limited coating is located on at least one of the side surfaces.