At present, the main problems in operation and actual production of centrifugal pump and pump station are:
1. In most cases, the centrifugal pump in the pump station deviates from its design condition and makes the operating efficiency lower.
2. In most of the centrifugal pump stations in our country, especially in the pumping stations with larger water level, the pumping stations often operate under low efficiency, resulting in a lot of waste of energy.
3. Some large flow centrifugal pumps cannot test their performance in the laboratory.
In order to meet the requirements of water demand and economic operation, it is often necessary to change the flow rate and the lift to make the working point change. Mechanical impeller internal flow analysis has always been the hot spot of the research problem, caused by the rotation of the impeller and the surface curvature, his brother's force and centrifugal force, make the flow inside the impeller is very complex, and often accompanied by flow separation and wake flow, etc. So far, it has not been fully applied to the three - element theory to design a satisfactory centrifugal pump.
For a long time, pump manufacturers at home and abroad for the development of the new pump is generally adopt the following procedures: first, design a few impeller, pump shell, and then build a model, on the last test bench, through modification, design, and test procedures, until meet user requirements. So can according to the design of the pump impeller and volute (guide vane) estimate hydraulic parameters, such as pump characteristic curve, can obviously reduce the model of the pump production, manufacture, test cost, shortening the period of design, manufacture, has the very realistic significance.
According to data shows, sponsored by the department of tsinghua university in 1998 with the fan of the 3rd international conference on paper with 85% from colleges and universities and scientific research units, main pump factory almost no papers published in China. Compared with foreign countries, the paper published by Germany and Japan pays more attention to the reality, and is good at solving the difficult problems of pump users and manufacturing plants, and also has academic value. In the paper published in China, there are not many high level papers with practical value and academic significance, and the paper generally lacks clear practicality and guiding significance. This is determined by the current state of cooperation and the current economic environment. Stainless steel self-priming pump.
At present, several important research directions in pump technology are:
1. Performance research. 2. Operation and fault diagnosis. 3. Cavitation research. 4. Design and product development. 5, CFD.
Pump design and product development and performance research are the endless research direction and hot spots in pump products. The research of these two aspects belongs to the field of applied research, and can enrich the basic theory and technology of the pump, and it is more likely to produce results.
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