Fluid Machine Runner With Plane Contact Surfaces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The production of runners for fluid machines with double curved blades requires complex machining and tight tolerances, making the process time-consuming and costly due to the intricate contact surfaces between the blades and the runner hub or ring.
Innovation Solution
Introducing plane contact surfaces between the double curved socket portions of the blades and the runner hub or ring, with a contact body positioned between these surfaces to simplify the assembly and reduce the need for precise matching profiles, utilizing plane contact surfaces that are perpendicular to the fixing elements to enhance stability and load capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If double curved surface areas are used for blade contact with runner hub, then the blade can be securely fixed, but the machining and inspection work becomes time consuming and costly
Solution Approach 1:
The contact surface is segmented into multiple localized plane contact surfaces rather than a single large double curved surface. This segmentation allows each contact surface to be machined independently with standard tolerances, significantly reducing machining time and inspection requirements while maintaining secure blade fixation through multiple contact points
Solution Approach 2:
Instead of requiring the entire contact surface to have precise double curved geometry, the invention applies plane contact surfaces at specific localized positions where the blade bears against the runner hub. This local quality approach maintains the necessary fixation reliability at critical points while allowing the rest of the surface to be manufactured more simply
2Manufacturing precision
If double curved surface areas with close tolerances are used, then the blade contact precision is improved, but the manufacturing cost increases
Solution Approach 1:
The contact interface is divided into multiple discrete plane contact surfaces, each requiring only standard machining tolerances. This segmentation eliminates the need for expensive precision machining of large double curved surfaces while achieving adequate contact precision through the distributed nature of the contact points
Solution Approach 2:
The invention changes the geometric parameters from double curved surfaces with close tolerances to plane surfaces with standard tolerances. This parameter change maintains the functional requirement of secure blade contact while dramatically improving ease of manufacture and reducing costs
3Force
If the blade socket portion bears on the runner hub surface area, then the load distribution is achieved, but the complexity of the contact geometry increases
Solution Approach 1:
The load-bearing contact area is segmented into multiple localized plane surfaces distributed across the blade-runner hub interface. This segmentation provides adequate load distribution through multiple contact points while using simple plane geometry instead of complex double curved surfaces, thereby reducing manufacturing complexity
Solution Approach 2:
The invention introduces a contact body as an intermediary element between the blade socket portion and the runner hub. This contact body simplifies the overall geometry by providing a standardized interface that distributes loads effectively while avoiding the complexity of precision-machined double curved contact surfaces
Data Source
Figure 1~2
Figure 3~7
Figure 8~10
AI summary
Runner (1) for a fluid machine where the runner (1) includes a runner hub (2) and one or more curved blades (6), and where the blade (6) is removably fixed to the runner hub (2) by fixing elements (20) that extends into a double curved first socket portion (14) of the blade (6), and where the first socket portion (14) bears against the runner hub (2) at one or more contact surface (30) that is plane.