Decoupling Test Device for Centrifugal Pumps

Abstract

The invention relates to a decoupling testing device for a centrifugal pump. A spiral casing of the centrifugal pump is arranged on a spiral casing support pedestal through a separation decoupling bracket, an impeller rotor is arranged on a motor shaft of a driving motor of the centrifugal pump, and the driving motor of the centrifugal pump is arranged on a motor support pedestal which is independent of the spiral casing support pedestal, so that the spiral casing is physically separated from a rotor of the driving motor to realize the vibration decoupling of fluid excitation, mechanical excitation and electromagnetic excitation; a dynamic pressure pulsation sensor and a vibration acceleration sensor are arranged on the spiral casing, an eddy current sensor is arranged at the impeller rotor, a wireless stress-strain sensor is arranged on a blade, vibration acceleration sensors are arranged at bearings and legs of the motor, are connected with an acquisition and data analysis device, and are used for acquiring vibration transmission characteristics of a fluid excitation source to analyze quantitative characteristics of the fluid excitation source and realize the directional vibration and noise reduction design according to the quantitative characteristics of the fluid excitation source.

Description

technical field [0001] The invention relates to a centrifugal pump test device, in particular to a centrifugal pump decoupling test device. Background technique [0002] A centrifugal pump is a general-purpose fluid machine that converts the mechanical energy of the prime mover into the pressure energy and kinetic energy of the conveyed liquid. Reducing the vibration and noise of the centrifugal pump not only helps to prolong its service life, but also improves the working environment of the equipment and its surrounding life. environment. [0003] The excitation source that causes the vibration and noise of the centrifugal pump is mainly composed of three aspects: fluid excitation, mechanical excitation and electromagnetic excitation. The vibration and noise of the pump volute and impeller are transmitted to the machine base. It is related to the fluid flow condition of the flow field in the centrifugal pump. The main factors affecting the fluid flow condition of the flow ...

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Problems solved by technology

[0006] (1) The vibration and noise generated by fluid excitation, mechanical excitation and electromagnetic excitation are coupled with each other. The vibration and noise response of the electric centrifugal pump unit is the aliasing coupling effect of each excitation source, and the separation of the excitation sources cannot be realized. This makes the quantitative identification of the excitation source difficult. It brings great difficulty, and it is impossible to achieve a directional vibration and noise reduction design for different excitation characteristics of centrifugal pumps;

[0007] (2) Under the existing centrifugal pump structure, the volute and the motor are rigidly connected, and it is impossible to complete the experimental research on the influence of single factor changes such as volute profile design, volute processing materials and processing technology on the vibration and noise of electric centrifugal pumps

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