Pipeline structure and method for reducing self-excited vibration of pump system

Abstract

The invention discloses a pipeline structure and method for reducing self-excited vibration of a pump system, and provides the pipeline structure for reducing the self-excited vibration of the pump system. The pipeline structure comprises a thin steel pipe, a thick steel pipe and a polyethylene pipe to form a water outlet pipe of the pump system. According to the pipeline structure and method, parameters such as vibration period change, frequency response and the like of the self-excited vibration of the pump system can be obtained, and simultaneously the relationship between obtained data andpipeline parameters is analyzed to provide guidance for designing the pump system, so that the speed of development of the self-excited vibration of the pump system is effectively alleviated, the vibration period of the self-excited vibration is increased, and the vibration frequency at the initial stage of the self-excited vibration is reduced to gain time for prevention of pipe explosion and reduce the risk of the self-excited vibration of the pump system.

Description

technical field [0001] The invention belongs to the field of water conservancy engineering, in particular to a pipeline structure and method for reducing self-excited vibration of a pump system. Background technique [0002] With the acceleration of my country's urbanization process, people's demand for water resources is increasing, and the supply and demand of water resources in some areas have become increasingly prominent. In order to solve the problem of water shortage, my country has successively built a large number of water supply projects. The pressurized water delivery method has its unique characteristics and is widely used. It is a direct method to transport water from a low place to a high place. However, in the actual operation of the pump system, the base bolts will loosen and the connection of the pipeline will loosen. Water leakage and other accidents, these situations may be caused by the self-excited vibration generated in the pump system, but the specific v...

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Problems solved by technology

[0002] With the acceleration of China's urbanization process, people's demand for water resources is increasing, and the supply and demand of water resources in some areas have become increasingly prominent. In order to solve the problem of water shortage, a large number of water supply projects have been built in China. Due to pumping stations The pressurized water delivery method has its unique characteristics and is widely used. It is a direct method to transport water from a low place to a high place. However, in the actual operation of the pump system, the base bolts will loosen and the connections of the pipes will loosen. Water leakage and other accidents, these situations may be caused by the self-excited vibration generated in the pump system, but the specific vibration characteristics and vibration mechanism are not very clear, the potential factors in the pump system that cause self-excited vibration or the system instability There are many factors, such as valve sealing ring failure, pump with cavitation, etc. Since the research on the self-excited vibration of the pump system is not deep enough, it is difficult to formulate corresponding prevention and elimination measures. If the self-excited vibration cannot be eliminated in time, it must be It will lead to catastrophic accidents, so how to reduce or even eliminate the self-excited vibration of the pump system has become a key issue

[0003] The research methods of hydraulic vibration of water pump system mainly include hydraulic impedance method, transfer matrix method and characteristic line method. Hydraulic impedance method and transfer matrix method apply the research methods of linear vibration theory and electric transmission theory to the analysis of fluid oscillation, which can It is better to simplify the calculation of some more complex water delivery systems, but its analysis is only applicable to the case of small fluctuations, and the error impact after linearization on the case of large fluctuations is relatively large; at present, the self-excited vibration of any pump system can use the characteristic line It can intuitively reflect the characteristics of the self-excited vibration amplitude changing with time, but it cannot directly analyze the more valuable information such as the vibration period change and frequency response of the self-excited vibration of the pump system from the calculation results. Moreover, the characteristic line method is only suitable for unsimplified equations, and it takes a lot of calculation time to analyze the transition process.

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