Grooved Detuning Ring for Vertical Pump Resonance Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vertical pump assemblies experience structural resonance conditions due to low stiffness, leading to amplified vibrations that breach compliance standards and cause equipment failure, particularly in variable frequency drives, with existing mitigation strategies being costly, requiring maintenance, or having limitations such as residual unbalance and material degradation.
Innovation Solution
A detuning ring with a grooved structure is arranged between the drive and hydraulic units of the pump assembly, reducing stiffness without impairing stability, and optionally filled with vibration absorbing material, to shift natural frequencies and minimize resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the stiffness of vertical pump assembly is increased to reduce resonance, then structural stability improves, but manufacturing complexity and cost increase
Solution Approach 1:
The patent changes the stiffness parameter of the pump assembly by introducing a detuning device that modifies the natural frequency of the structure. This allows the system to operate away from resonance conditions without requiring a complete redesign of the structural stiffness, thereby avoiding complex manufacturing changes while improving stability.
Solution Approach 2:
The detuning device acts as an intermediary element between the pump components and the foundation. It introduces a controlled compliance that shifts the natural frequency of the assembly, allowing the main structural components to remain simple while achieving the desired stability through this intermediate element.
2Object-affected harmful factors
If detuning devices are added to reduce resonance vibrations, then vibration levels decrease, but device complexity increases
Solution Approach 1:
The detuning device is segmented into simple modular components including springs and dampers that can be independently selected and assembled. This segmentation allows for straightforward installation and configuration without requiring complex integrated designs, thereby reducing the overall device complexity while achieving vibration reduction.
Solution Approach 2:
The patent utilizes damping materials with porous or viscoelastic properties to dissipate vibration energy. These materials can be incorporated into the detuning device in simple configurations, providing effective vibration reduction without adding significant structural complexity to the overall system.
3Object-affected harmful factors
If passive dynamic absorbers are used for detuning, then resonance conditions are reduced, but maintenance requirements increase due to material degradation
Solution Approach 1:
The detuning device uses inexpensive damping elements and springs that can be easily replaced if degradation occurs. Rather than using complex, expensive passive dynamic absorbers with long service lives, the patent employs simple, replaceable components that minimize maintenance burden and cost, aligning with the disposable component approach.
Solution Approach 2:
The damping elements in the detuning device are designed to maintain their effectiveness over time without requiring active control or complex monitoring systems. The passive nature of the damping components allows them to self-regulate and maintain performance without external intervention, reducing maintenance requirements.
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
The detuning ring effectively reduces resonance-induced vibrations, maintaining structural integrity and reliability, suitable for both new and existing equipment, with minimal material and space usage, and reduced maintenance needs.
Implementation Method 1
the detuning ring reduces the overall stiffness of the above-grade structure of a vertical pump assembly without impairing its structural stability
Implementation Method 2
optionally filled with vibration absorbing material, to shift natural frequencies and minimize resonance
Data Source
AI summary
A detuning ring includes first and second axial faces, and is for detuning a structural resonance in a pump assembly. The first axial face includes first lands and first grooves, each first land extending in a radial direction and including a planar first top face, and each first groove delimited by two adjacent first lands and the first axial face. The second axial face includes second lands and second grooves, each second land extending in the radial direction and including a planar second top face, each second groove delimited by two adjacent second lands and the second axial face. The detuning ring is to be arranged between the drive unit and the hydraulic unit of the pump assembly, and is to be fixed relative to the drive unit or the hydraulic unit.