Vane Cell Pump Impeller Chamber Wall Web Design
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Solution Overview
Problem
Existing vane cell pumps face difficulties in assembly and manufacturing due to spring-loaded pump vanes, and there is a need to increase pump capacity without expanding the installation space, while minimizing the risk of cavitation.
Innovation Solution
The impeller design features a chamber wall with axially projecting webs to secure pump vanes and accommodate a resilient position ring, allowing for a larger conveying chamber volume without increasing rotational speed, and includes regions with varying radii to facilitate sintering and reduce the risk of damage during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spring elements are used to press pump vanes against the housing ring, then the pump vanes can abut against the inner face of the housing ring even at low rotational speeds, but assembly of the vane cell pump is rendered difficult since the pump vanes can spring out of the vane receptacle when inserting the impeller into the housing ring
Solution Approach 1:
The chamber wall is divided into multiple regions (first wall region for receiving pump vanes, second wall region for sintering tool abutment, third wall region for enlarged conveying chamber). This segmentation allows each region to be optimized for its specific function, with the first wall region providing secure pump vane reception while the other regions support manufacturing and capacity requirements.
Solution Approach 2:
An axially projecting web is added to the chamber wall, extending in the axial dimension. This web provides a stop that prevents the position ring from moving axially beyond a certain point, thereby preventing pump vanes from being pressed completely out from the vane receptacle during assembly while still allowing the spring elements to function at low rotational speeds.
2Productivity
If the installation space is not enlarged, then the pump capacity can be increased, but the conveying chamber volume is limited
Solution Approach 1:
The chamber wall configuration, particularly in the third wall region, creates additional conveying chamber volume by extending radially inward with a smaller radius. This utilizes the axial and radial dimensions more effectively to increase the conveying chamber volume without increasing the overall installation space envelope.
Solution Approach 2:
Different wall regions have different radii and material thicknesses optimized for their specific functions. The third wall region has a smaller radius to maximize conveying chamber volume, while the first and second wall regions have larger radii to ensure structural integrity and support manufacturing processes. This local optimization allows increased pump capacity within the same installation space.
3Strength
If the material thickness in the radial direction is increased to securely receive pump vanes, then the pump vane reception is improved, but the conveying chamber volume is reduced
Solution Approach 1:
The chamber wall is designed with different material thicknesses in different regions. The first wall region has sufficient material thickness to securely receive pump vanes, while the third wall region has reduced material thickness to maximize conveying chamber volume. This localized differentiation allows both structural strength and maximum conveying volume to be achieved.
Solution Approach 2:
The chamber wall is segmented into multiple functional regions with different thickness requirements. The first wall region (for pump vane reception) maintains adequate thickness for strength, while the third wall region (for volume optimization) has minimal thickness. This segmentation resolves the contradiction between strength and volume by applying different design criteria to different parts of the same structure.
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 enhances pump capacity while maintaining the same installation space, reduces the risk of cavitation, and simplifies the manufacturing and assembly processes by allowing for higher rotational speeds and increased volume flow without compromising stability.
Implementation Method 1
The position ring is made, for example, of a resilient material, which abuts radially inward against the pump vanes, to press the pump vanes radially outward
Implementation Method 2
during the manufacture of the impeller by sintering
Implementation Method 3
during the manufacture of the impeller by sintering, the impeller cannot be damaged by a sintering tool
Data Source
AI summary
An impeller for a vane cell pump includes, but is not limited to vane receptacles for receiving an at least radially movable pump vane. A chamber wall is formed between two adjacent vane receptacles to form a conveying chamber. The chamber wall has an axially projecting web for delimiting a movement of a position ring with respect to the radial movement of the pump vane. The chamber wall includes, but is not limited to a first wall region for secure receiving of the respective pump vane in the vane receptacle. The chamber wall further includes, but is not limited to a second wall region for forming a web thickness d of the web for secure abutment of a sintering tool. In addition, the chamber wall has a third wall region for forming an enlarged conveying chamber volume. As a result, the impeller is easily manufactured and has an enlarged pump capacity for the same installation space.