At present, China's own design and production of the pump has been put on the domestic market has been to the achievement, the vast majority of market share almost, but in foreign markets, China's own design and production of water pump is difficult to play in, the reason is because of China's own production design of the pump and the international advanced level there are some gaps. In this paper, the current situation of water pump research at home and abroad, analysis and propose feasible measures for water pump transformation, for our own research and development of pump technology to meet or exceed the international level to provide theoretical support.

1 development status of water pump technology in our country

At this stage the pump production form in China and drawing model mainly for joint design, introduction and self-developed several, used on the Chinese market and industry pumps are basically through these means of design and manufacture, is the leading products in the domestic market, but the product design level and technology compared with the international advanced level there is a the gap. For example, domestic production of water pump little design is often completely independent, copy or reference according to the foreign pattern, lack of independent research and development of flexible and ingenious, scalability is very small, which also caused China's lack of independent consciousness in the production design of pump in the process of thinking is not flexible enough, not from the current frame breaking out these design and form their own unique design and technology. If only on the basis of other people to modify, improve, and the lack of foreign designers that free and unrestrained thinking, this will not make great progress and breakthroughs. In addition, although the domestic design and production of water pump cost is low, and soon occupied the domestic market, but in the international market is still blank.

2 foreign advanced water pump technology development status

In some foreign advanced countries, they are on the design of the pump has a unified design concept, namely ran mechanism and artful design, flexible thinking, has the sense of design, independent attention at the same time the pump structure as well as the pump material, than Italy state of the pump material is very exquisite, stainless steel shell must have a certain standard can be used, in addition to Japan in the design and manufacture of the pump, to pump the details of their requirements are very high, made of very fine water pump.

Foreign water pump research and design relative to domestic, mainly in the following aspects of leading:

1) large capacity computers, accurate prediction techniques, models, computer design techniques, etc.;

2) found an important achievement in the development of water pump cavitation phenomenon, there are the exponential relationship between flow components of the dE/dt pump cavitation damage degree and bubble length: dE/dt=K, L and bubble length approximate calculation method;

3) study the vibration characteristics of the pump in two directions and achieve certain results;

4) an inverse function is introduced to transfer the vibration value of the measuring pump to obtain the external force characteristics of the impeller;

5) in the design, foreign pay more attention to impeller dynamic characteristics and cavitation phenomenon of research, the invention and application of magnetic shaft to achieve a major breakthrough in the field of water pump technology;

6) computer based realization of mechanical parts solid forming technology, to improve the design level has more obvious significance.

3 feasible measures to improve the design performance of pumps in China

In recent years, the pump design and manufacturing technology of our country has made great progress, some design has been close to the international advanced level, but there are still some gaps in many aspects of the design and manufacture of pumps, such as design, mechanical design and manufacture of new materials, technology and other aspects, so our research in the pump design process, first of all should attitude adjustment, establish the correct concept, and then the further research and development of material and technical aspects.

3.1, the impeller of the transformation

The impeller is the heart of the pump, he decided the pump head and efficiency, in the working conditions and design difference is not big, the pump body on the performance of the pump is smaller, more to improve the impeller is particularly important. First of all, we can introduce advanced foreign large capacity computer precise prediction technology, and organize professionals to do fine research on it. Through the technique of model prediction and design of the pump impeller, analysis the dynamic characteristics of the impeller and using the finite element method and experimental modal, using modal confidence and sensitivity of eigenvalue modification theory, improvement of the impeller design provides a dynamic design method based on. In order to prolong the service life of the impeller, in addition to improve the cavitation performance, but also can be used as the quality timber, 1Cr13Ni4Mo stainless steel etc..

The concept of technical reformation of the pump impeller should be concentrated on flexibility and adaptability, aiming at the international advanced CFD technology, three yuan flow technology, China's relevant agencies and departments should increase investment in research and development, the establishment of training system, system of professional R & D team and R & D personnel, personnel for conveying pump technology research and development the Everfount.