The intersection of diesel engine pump for fire fighting full characteristic curve in water pump and backwater pump area
Diesel engine pump for fire fighting introduced the basic principles of frequency conversion speed regulation. According to the small square method, the performance curves of different parallel configuration schemes of the pumps are derived theoretically, and the corresponding performance curves are drawn using MATLAB engineering software. Then, it discusses the energy-saving principle of variable frequency speed regulation in different water pump configuration schemes, analyzes its energy-saving effect theoretically, and calculates the speed regulation range of water pump frequency conversion speed regulation using graphic method. After that, a typical project was selected for the diesel engine water pump. First, through calculation and analysis, the energy-saving effects of different parallel configuration schemes of the water pumps were compared. Then, the speed adjustment range of the water pump in the system is calculated.
The design concept of an automatic control system for a coal mine main drainage pump. The application automatically controls the water pump to realize the functions of water level monitoring, automatic start and stop of the water pump, and fault self-diagnosis. And can communicate with the host computer, realize remote control and online monitoring, and improve the automation level and safety of coal mine. The development status and trends of water pumps at home and abroad are introduced, and the gap between the energy consumption level of my country's water pump industry and the country, and the challenges faced by water pump energy saving are analyzed. Through the case analysis of energy-saving renovation of circulating water pumps in thermal power plants, the technical approaches and energy-saving effects of water pumps in my country are proposed. , And measures to further improve energy efficiency in my country's water pump industry.
The full characteristic curve of diesel engine pump for fire fighting shows "S"-shaped characteristics in the pump working condition and backwater pump area, and the curves have cross and overlap phenomena. This multi-value of flow and torque will bring to the analysis of the transition process Inconvenience. The improved Suter curve transformation method is used to convert the full characteristic curve of the diesel engine water pump in the four quadrants into two groups of periodically changing curves, namely the WH (x, y) line and WM (x, y) line; On the basis of the original data curve characteristics unchanged, the full characteristic curve of the diesel engine water pump was transformed, and then the small square surface fitting mathematical model was used to perform surface fitting on the transformed WH curve and WM curve, and obtained Three-dimensional surface fitting diagram of 2 sets of curves. The transformed WH curve and WM curve are smooth and smooth, becoming 2 sets of approximately parallel curves, which eliminates the uneven distribution of the Suter conversion curve and the multivalued interpolation.
This eliminates the cross and overlap phenomenon of the full characteristic curve of the diesel engine water pump in the water pump and the backwater pump area and the uneven distribution of the two ends of the curve, which provides convenience for the analysis of the transition process of the diesel engine water pump. Water pump testing technology for the research and development of the basic theory of water pumps The improvement of water pump performance and the improvement of water pump design methods all play an extremely important role. Therefore, the research of the automatic test system for comprehensive parameters of water pumps has become one of the topics of widespread concern in the industry. At present, domestic water pump testing systems have low measurement accuracy, poor real-time performance and poor reliability. Many of them are traditional semi-automatic forms, with scattered position measurement, no integrated management of all measurement signals, and human-machine interface is not friendly enough. Compared with foreign countries, the level of technology is relatively backward.