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Present situation and development of pump tech. in China
1, the source of China's pump product design can be divided into joint design, the introduction of the development of several.
(1) joint research units to design products to Shen pump mainly, 60~80 in twentieth Century, about a joint design of many kinds of pump pump. Such as IS (IB) type single-stage single suction centrifugal pump; IH pump; S (SH) double suction centrifugal pump; D (DG) type multistage pump; W type vortex pump; Y type pump; JC type deep well pump; HW type mixed flow pump; QJ type submersible pump; IR type hot water pump; BPZ type sprinkler self-priming pump; FY type anti-corrosion liquid centrifugal pump; 3G type three screw pump etc..
These products are the main products at the time, is still in production, but some of the product structure (modeling), performance indicators are relatively backward, should be gradually replaced with new products.
(2) before the introduction of products in 80s pump technology imported by China is very few, to the beginning of reform and opening up, the introduction of a large number of pump technology from abroad, and with foreign companies to pump in the form of sole proprietorship or joint ventures have entered China, also brought some new technology of pump products. For example: Wolman stone slurry pump; pump (Tianjin Motor Factory) - submersible pump with the German company Ritz wells; Shenyang Pump (pump) - boiler feedwater pump of German KSB company; Shanghai electric power equipment factory boiler feedwater pump - Will Firm; condensate pump pump factory in Shanghai KSB company; Changsha condensate pump pump factory - Japan Hitachi company; - Swiss Sulzer Ltd Dalian acid resistant pump factory CZ, ZA (ZE) and other chemical process pump; pump sewage pump factory in Shanghai pump Denise company; water ring vacuum pump pump factory in Foshan, Germany's SIEMENS company; hot water pump, ship pump factory in Shanghai KSB the pump screw pump; Tianjin industrial pump factory in Germany - Al Wheeler company; Tianjin Industrial Pump Factory - Japan Akira's marine pump; deep well pump factory - Nanjing ABS company of German submersible sewage A large vertical pump; oblique flow pump Changsha pump factory - Ingersoll company; Shanghai pump factory - British M· high lift multi-stage centrifugal pump of J company; Xiangfan 525 factory - France H· company S phosphate pump.
The introduction of these pump products, technology is more mature, more advanced performance, to promote the development of China's pump technology has played an important role in the main body of China's pump products, is still a large number of production. Some of the products in the structure or performance problems, should be further improved.
(3) foreign joint ventures in China (owned) pump enterprise products such as: Shanghai KSB Omega (RDL) double suction pump, boiler feedwater pump, condensate pump; Jialite (Cha Yuan) - chemical process pump; Foshan (Ander Liz) - Nanjing Goulds pulp pump; ISO type single-stage single suction centrifugal type P pump, multistage centrifugal pump; Dalian imperial shield pump; Shenyang - Flygt submersible sewage pump; Suzhou Gelanfu stamping pump; Lanzhou naici - screw pump. The quality of these products is much better than domestic products, although the price is high, but the sales situation is very good.
(4) developed AY TSWA pump; multistage centrifugal pump; ZJ slurry pump; pump; direct pipeline pump; high water pump; air pump; submersible sewage pump; vertical sewage pump; submersible axial flow pump (pump); double suction pump, pulp pump etc.. Most of these products are universal, the degree of standardization is not high, the performance needs to be further improved.
2, the key pump products imported from the part of the basic national:
Due to the introduction of products and KSB and other famous enterprises, China's pump production capacity significantly improved. The main key sectors of the national economy can be produced with pumps. For example: supercritical boiler feedwater pump (pressure temperature 25 ~ 35MPa); high speed pumps, high pressure pump and ethylene hydrogenation unit; steel high-pressure descaling pump; large scale water pump, Dongshen Water Diversion Project; mining large flow and high lift (1000m) drainage pump; power plant flue gas desulfurization pump; refinery with the high temperature oil pump.
3, CAD based new technology widely used:
(1) the mold, blade and the important parts of the pump are processed by the numerical control machine tool, which can improve the manufacturing quality of the pump. The figure 1 is the numerical simulation of the axial flow pump blade and the three dimensional blade used for processing.
Numerical control milling machine for axial flow pump blade and blade for processing
(2) pump hydraulic design and drawing software gradually instead of manual calculation and drawing are asked to use this software to the design of the pump efficiency is high, this is the layman said, good software to people to use, can be dissolved into the designer's design thoughts and experience, but also quick and accurate. Figure 2 is the JP1 software design of the spiral centrifugal pump impeller hydraulic diagram, the design of the map only 10min, manual design may be two days.
Using JP1 software to design the impeller of spiral centrifugal pump
(3) the flow of pump flow from the main calculation methods of quasi three dimensional non viscous flow to the full three yuan three yuan in quasi viscous non viscous flow calculation is S1, S2 two stream surface iteration, it is the three-dimensional flow dimension into two dimensions, namely with the meridional (axial) and arbitrary rotating surface (flow surface) on the flow of iteratively solving three-dimensional flow problem. Because the complex three-dimensional flow is reduced to a two-dimensional solution, the accuracy of the solution is affected. In recent years, computational fluid dynamics (CFD), referred to as CFD, provides a new idea and method for fluid flow field calculation. Using CFD to calculate the flow field, first of all, we should draw the calculation area into a three-dimensional entity, then generate the grid, and then use the commercial CFD software Fluent to calculate, see figure 3.
(4) the measurement of the internal flow field is often carried out by the probe, on the one hand, the needle itself has a great influence on the flow, on the other hand, it is very complex to measure the rotational flow field. The laser Doppler velocimetry (LVD) is used to irradiate the particles in the flow, and the light is scattered by the particles. This method has been mature and widely used, but generally only a measure of the speed of a component. Now start using particle image velocimetry (PIV), its working principle is the spread of tracer particles in the flow field, using the pulse source irradiation field, through two consecutive or repeated exposure, particle image is recorded on the film, thus obtained the velocity distribution of the flow field. This method breaks through the limitation of the traditional single point measurement, and can measure the velocity distribution on the cross section without any contact.
(5) in order to improve the performance of the pump, the optimization design method has been studied by many scholars. Summed up in the following several ways: optimization with excellent model based on statistical data of the velocity coefficient method; optimization to minimize the hydraulic loss as the target loss extreme method; an index as the objective function of the optimization criteria for the screening method. It is worth noting that the current optimization design method, may only have a guiding significance for the design of concrete pump. In addition, the advent of CFD and other advanced technologies, to a large extent, dilute the interest in the optimization design, the past two years to study the optimization of the design method of scholars gradually reduced.
4, no clogging pump and low speed pump technology progress:
(1) our design method self clogging pump summed up, basically reached the practical level, the widely used design method mainly includes: the changes along the midline channel design of double channel impeller; grid conformal mappings for the design of screw centrifugal impeller; according to the impeller diameter, the maximum diameter and the volute throat area of cyclone the design of the three elements of impeller.
(2) the research on the theory and design of low specific speed pump has been widely applied in the field of non overload design.
5, axial flow pump model to achieve the advanced level of similar foreign models:
From September 25, 2004 to January 16, 2005, the national 27 model, participated in the Ministry of water resources water diversion project on Tianjin pump model test. The pilot leadership, organization, supervision and fair, accurate data. Compared with the original model, the efficiency of the axial flow pump is increased by about 2%, and the flow rate is increased by about 500, compared with the original model, the speed of the model is more than 5%. The average efficiency of the 7 models is more than 85%, which has reached the advanced level of similar foreign models. Low lift pumps, such as the national key project of the south to North Water Diversion project.
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