Decanter Centrifuge Frame Reinforcement for Resonance Control
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Solution Overview
Problem
Existing decanter centrifuges face challenges in maintaining the eigenfrequency of the frame to prevent resonance effects when the bowl is made longer and heavier, as increasing the frame's length reduces bending rigidity and mass, leading to potential resonance and damage.
Innovation Solution
The frame is reinforced with C-shaped beams and internal reinforcement plates that extend only partially along the longitudinal direction, focusing on areas of higher bending stress, while being supported by ground supports at the ends to maintain bending rigidity and eigenfrequency, thereby allowing the frame to be extended without significant weight increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the frame is made longer to support a larger bowl, then the retention time increases, but the bending rigidity decreases and eigenfrequency drops causing resonance
Solution Approach 1:
The patent applies local quality by placing reinforcement plates at specific locations along the box-shaped beams where bending stress is highest (near the center), rather than uniformly throughout. This targeted reinforcement maintains bending rigidity in critical areas while allowing the overall frame length to increase for longer retention time.
Solution Approach 2:
The patent uses composite construction by combining the box-shaped beam structure with internal reinforcement plates. This composite approach creates a stronger structural system that maintains high bending rigidity and eigenfrequency despite the increased length, preventing resonance while enabling longer retention time.
2Volume of moving object
If the frame is made longer to support a larger bowl, then the bowl capacity increases, but the mass increases reducing eigenfrequency
Solution Approach 1:
The reinforcement plates are placed locally at positions of highest bending stress rather than extending along the entire length of the box-shaped beams. This localized reinforcement approach minimizes the additional mass added to the frame while still effectively maintaining the eigenfrequency and preventing resonance, thus allowing increased bowl capacity without significant weight penalty.
3Strength
If reinforcement plates are added to maintain bending rigidity, then the eigenfrequency is maintained, but the weight of the frame increases
Solution Approach 1:
The patent minimizes weight increase by placing reinforcement plates only at specific locations where bending stress is highest (near the center of the box-shaped beams), rather than distributing them uniformly along the entire length. This selective placement maintains the necessary bending rigidity and eigenfrequency while adding minimal mass to the frame 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 configuration maintains the eigenfrequency of the frame, preventing resonance and potential damage, while enabling the decanter centrifuge to handle longer retention times and larger bowls without increasing weight significantly.
Implementation Method 1
The eigenfrequency of the frame is dependent on the bending rigidity of the frame and inversely dependent on the mass of the frame. More specifically, the eigenfrequency increases when the bending rigidity increases
Implementation Method 2
The vibrations will be induced into the frame and must be absorbed by the frame without causing any resonance effects in the frame
Implementation Method 3
The decanter centrifuge comprises a bowl rotationally mounted on a frame. During operation, the suspension forms a ring-shaped liquid layer along the interior wall of the bowl under the action of centrifugal force, in which the denser solid particles settle to the drum wall radially
Data Source
Figure 1~2
Figure 3
Figure 4A~4D
AI summary
The present invention relates to a frame for a decanter centrifuge. The frame comprising two elongated box-shaped beams extending parallel relative to each other between a first end and a second end. Each box-shaped beam comprising at least two ground supports at a third position at a fourth position, respectively. The third position being located adjacent the first end and the fourth position being located adjacent the second end. Each box-shaped beam further comprising a C-shaped beam defining two horizontal flanges and a vertical web interconnecting the two horizonal flanges and a vertical plate interconnecting the two horizontal flanges opposite the vertical web. The reinforcement plates extending in the longitudinal direction between a third end and a fourth end. The third end and the fourth end being located between the first end and the second end.