The development direction of stainless steel pumps

       It is reported that the Ministry of Industry and Information Technology is formulating a "manufacturing ‘going out' strategic plan” to strengthen the overall coordination and classification guidance for enterprises. In order to cope with the increasingly global industrial development, we must have an understanding of the current status and development trend of stainless steel pumps and pumping stations in the world.

   With the continuous improvement of stainless steel pump design and manufacturing technology and application technology, the manufacture and production of stainless steel pumps are developing along the direction of large-scale, large-capacity, high-lift, high-speed, serialization, generalization, and standardization. The level of automation control at the pumping station is also increasing.

   1. Large size and large capacity

   In the past few years in 2009, large stainless steel pump technology has developed rapidly. The diameter of the impeller of the giant axial flow pump has reached 7m, and the diameter of the submersible pump has reached lm. The largest axial flow pump in China produces 6000kW, mixed flow pump 7000kW, centrifugal pump 8000kW; high pressure boiler feed pump has a capacity of 60,000kW; new centrifugal submersible pump has a flow rate of 1800m3/h, corresponding lift 110m, maximum water output reaches 28800m3 /h, and there is a tendency to expand again. In terms of pumping stations, a number of large-scale pumping stations with novel structures have emerged, such as “egg” type structural pumping stations, inlet and outlet pipes, and pool construction pumping stations. With the promotion and use of submersible pumps in drainage, a large and medium-sized pump station with small space, low investment and new structure, such as the structure of wet-well pump house constructed by steel or reinforced concrete, has emerged.

   2. High lift and high speed

   With the continuous improvement of pump cavitation and material strength, the speed of the pump is also getting faster and faster. In the 1980s, the international multi-stage centrifugal pump speed was 7500r/min, which has now increased to 10,000r/min. The increase in speed will inevitably increase the lift of the pump. In 2009, the single-stage head of the boiler feed pump has broken the record of 1000m, and the head of the multi-stage pump can reach more than 2000m. To further achieve high lift, the pump speed must be increased. After that, with the continuous advancement of technology, the rotational speed of the pump has further developed in the direction of high speed. In the pump industry, the trend of this high speed is global.

   3. Serialization, generalization, standardization

   The serialization, generalization and standardization of products (referred to as “three-way”) are the inevitable requirements of modern industrial production processes. In 1975, the International Standardization Association developed the main dimensions and specifications of a single-stage centrifugal pump with a rated pressure of 720 kPa (ISO 2858-1975E). The performance range of this standard pump is: flow rate is 6.3 ~ 400m3 / h, head is 25 ~ 125m. In 2009, pumps in Europe that meet this specification have been sold as standard pumps. Since 1958, China has done a lot of work in the unified model, series classification, stereotypes, etc. The main components such as the brackets, suspensions and bearing frames of the water pump have already had a series of standards. "The degree is constantly improving.

   4. The pump station automation level is gradually improved

   In the past few years in 2009, the automation equipment of pumping stations has become more and more perfect, and the level of automatic control has become higher and higher. The modern pumping station can realize automatic control from unit start-up, monitoring operation, shutdown to multi-stage pumping station system adjustment and optimization scheduling. Computer technology and network system are increasingly widely used in the automatic control of pumping stations, and the management level is also Gradually improve.

   With the development of science and technology such as atomic energy and combustion chemical industry, it will further require the development of various special water pump products with high speed, high temperature and high pressure resistance, high efficiency and large capacity. At the same time, it is required to continuously improve the quality of existing conventional products. Level. In order to achieve this goal, innovation must be carried out in a series of links such as basic theory, computational techniques, model tests, measurement methods, material selection, and processing techniques. In the design and operation management of pumping stations, measures should be taken actively to maximize the efficiency of working pumps and improve the automation control level of pumping stations.

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Reprinted: China Pump Industry Network