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Introduction of characteristic curve of parallel configurati

Article provenance：Hai Rui ZhonglianPopularity：Publication time：2020-03-24 08:59

According to the least square method, the performance curves of different parallel configuration schemes of diesel engine water pump are derived theoretically, and the corresponding performance curves are drawn by MATLAB engineering software. Then, the energy-saving principle of variable-frequency speed regulation of different pump configuration schemes is discussed, and the energy-saving effect of variable-frequency speed regulation is analyzed theoretically, and the optimal speed range of variable-frequency speed regulation of diesel pump is obtained by graphic method. Then, the typical project of diesel pump is selected. Firstly, through calculation and analysis, different parallel configuration schemes of diesel pump are compared to set the energy-saving effect of variable frequency speed regulation. Finally, the optimal speed range of the pump in the system is given.

The design idea of the automatic control system of the main drainage pump in the coal mine. The application program can automatically control water pump, realize water level monitoring, automatic start and stop of water pump, fault self diagnosis and other functions. It can communicate with the host, realize remote control and online monitoring, and improve the level of automation and safety of coal mine. This paper introduces the development status and trend of pumps at home and abroad, analyzes the gap between the energy consumption level of pumps in China and the advanced countries, and the challenge of energy saving of pumps. Based on the case analysis of the energy-saving transformation of circulating water pump in thermal power plant, the energy-saving technology and energy-saving of water pump in China are put forward. This impact, as well as measures to further improve the energy efficiency of China's pump industry.

The full characteristic curve of diesel engine water pump shows "s" characteristic in the working state and reverse pump area. There are crossing and overlapping phenomena on the curve. This multi value of flow and torque brings inconvenience to the analysis of the transition process. By using the improved Suter curve transformation method, the four quadrant full characteristic curve of diesel engine pump is transformed into two groups of periodic curves, namely wh (x, y) and WM (x, y) On the basis of keeping the characteristics of the original data curve unchanged, the full characteristic curve of the diesel engine pump is transformed, and then the wh curve and WM curve obtained by the transformation are fitted by the least square surface fitting mathematical model, and the three-dimensional surface fitting graphs of the two groups of curves are obtained. Get. The transformed wh curve and WM curve are smoothed into two groups of parallel curves. The defects of uneven distribution and multiplicity of interpolation are eliminated.

It eliminates all the cross and overlap phenomena between the pump and the pump and the uneven distribution of the two ends of the curve, which provides convenience for the transient analysis of the diesel pump. The research and development of pump testing technology, the improvement of pump performance, the improvement of pump design method and so on are of great importance. Therefore, the research of pump comprehensive parameter automatic testing system has become a topic of widespread concern in the industry. At present, the measurement accuracy of domestic water pump test system is low, the real-time and reliability are poor, and most of them adopt or traditional semi-automatic form, the measurement position is scattered, all the measurement signals are not fully managed, and the human-computer interface is not friendly.