Vertical Pump Damping Arms for Resonance Suppression
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Solution Overview
Problem
Vertical pumps experience resonance-induced vibrations due to structural natural frequencies matching the pump's operating speed, leading to premature bearing failure and wear, with existing solutions like passive dynamic absorbers and resilient layers being limited in effectiveness and requiring high expertise, and bow centralizers being difficult to design and install.
Innovation Solution
A pump assembly with independently movable damping arms that connect the pump column to the canister, providing stiffness and stability by allowing each support end to move independently, thus maintaining contact and suppressing vibrations without affecting other support ends, allowing for easy installation and adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive dynamic absorbers or resilient layers are used to suppress vibrations, then vibration suppression effectiveness is improved, but device complexity and installation difficulty increase
Solution Approach 1:
The vibration suppression system is divided into multiple independent damping arms (typically 3-6 arms) that are evenly distributed around the pump column. Each damping arm operates independently to suppress vibrations, replacing complex integrated solutions with simpler modular components that are easier to install and maintain.
Solution Approach 2:
Instead of making the pump column itself resilient or adding complex active vibration control systems, the invention inverts the approach by adding simple passive damping arms that contact the canister wall. This reverses the conventional wisdom of making the pumped object resilient and instead dampens vibrations through external simple arms.
2Stability of the object's composition
If bow centralizers are used to support the pump column, then structural stability is improved, but ease of installation deteriorates
Solution Approach 1:
The damping arms are designed with rotational joints at both ends, allowing them to dynamically adjust their angular position as the pump column vibrates or shifts. This dynamic capability maintains continuous contact with the canister wall for stability while allowing easy installation without precise alignment, as the arms can adapt to minor positioning variations.
Solution Approach 2:
The damping arms can change their effective stiffness and contact pressure parameters as they rotate and adapt to the pump column's position. This parameter adaptability provides stable support while simplifying installation, as the arms automatically adjust to fit the installation tolerances without requiring precise pre-alignment.
3Ease of operation
If the pump column is freely hanging without support, then ease of installation is improved, but vibration suppression effectiveness deteriorates
Solution Approach 1:
The damping arms act as intermediary elements between the freely hanging pump column and the canister wall. They provide the necessary vibrational support and damping without requiring the pump column to be rigidly fixed or the canister to be modified, thus maintaining ease of installation while improving vibration suppression effectiveness.
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 damping arms effectively suppress vibrations, shifting natural frequencies away from the operating speed, preventing resonance and extending the lifespan of pump components, while being cost-efficient and easy to install, suitable for retrofitting existing pumps.
Implementation Method 1
a pump assembly with damping arms for suppressing a vibration of a pump column of a vertical pump
Implementation Method 2
Each damping arm has an support end, for supporting the respective damping arm on an inner surface of the canister in a radial direction
Data Source
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AI summary
A pump assembly comprising a vertical pump (100) arranged in a canister (6), is proposed. The vertical pump (100) comprises a pump column (3) disposed between a pump head (12) and a pump bowl (11) in an axial direction (A), wherein a fluid can be pumped from a column inlet (14) at the pump bowl (11) to a column outlet (31) at the pump head (12) by means of a pump device arranged in the pump column (3). The pump column (3) is supported in a stabilizing manner by means of at least two damping arms (15) provided on an outer surface (30) of the pump column (3), wherein each damping arm (15) has an support end (150) for supporting the respective damping arm on an inner surface (60) of the canister (6) in a radial direction perpendicular to the axial direction (A). The pump assembly is characterized in that each support end (150) is movable independently from the other support end (150) or the other support ends (150), in particular with respect to the axial direction (A).