Goblet-Shaped Rotor Stiffening for High-Speed Deformation Control
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Solution Overview
Problem
Existing rotation devices face limitations in achieving high rotation speeds due to radial and axial deformation of goblet-shaped rotor dishes under centrifugal forces, leading to potential contact with the stator and restricted maximum achievable speed.
Innovation Solution
The rotation device incorporates a stiffening structure with multiple rings connected to the rotor shaft and dishes, featuring a Laval construction for enhanced stiffness and reduced deformation, along with a shoring structure to prevent elastic deformation, ensuring the peripheral edges remain within a predetermined tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the rotor rotates at very high speeds, then the centrifugal forces increase, but the radial and axial deformation of the rotor dishes increases causing contact with the stator
Solution Approach 1:
The rotor structure is divided into multiple components: the rotor shaft, rotor dishes, and stiffening rings as separate elements that are assembled together. The stiffening rings are positioned at specific locations on the rotor dishes to provide localized reinforcement without requiring the entire structure to be massively reinforced, thus maintaining high-speed capability while preventing deformation.
Solution Approach 2:
The rotor is constructed using composite material structure combining the rotor shaft, rotor dishes made of sheet material (such as fibre-reinforced plastic, aluminium alloy, titanium alloy, stainless steel or spring steel), and stiffening rings. This composite construction allows optimization of each component's material properties to resist centrifugal forces while maintaining overall structural stability at high rotation speeds.
2Stability of the object's composition
If stiffening structures are added to the rotor, then the structural stability improves, but the device complexity increases
Solution Approach 1:
Instead of uniformly reinforcing the entire rotor structure, stiffening rings are strategically positioned at specific locations on the rotor dishes where deformation is most critical. This localized reinforcement approach provides necessary structural stability while minimizing the addition of components and maintaining relative simplicity of the overall design.
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 allows for higher and more stable operation over a greater range of rotation speeds, preventing deformation and maintaining structural integrity at extreme speeds.
Implementation Method 1
at the mechanically realizable very high rotation speeds that the roughly goblet-shaped rotor dishes display, as a result of the very high centrifugal forces which occur, a radial and an axial deformation
Implementation Method 2
a rotor shaft which extends in this housing and outside this housing and which is rotatably mounted relative to this housing and supports a rotor
Data Source
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AI summary
The invention relates to a rotation device, such as a pump or a hydromotor of the rotating type, wherein a rotation-symmetrical rotor bounds at least two rotor channels together with radial baffles. The rotor comprises two generally goblet-shaped dishes, the innermost dish of which is stiffened by a first stiffening plate which has a peripheral widening, for instance branches in its peripheral zone into at least two rings which are rigidly connected with at least two respective bent peripheral edges, substantially over the whole outer surfaces thereof, to the inner surface of the peripheral edge of the relevant dish such that the stiffness of the peripheral edge of the dish is increased.