Water pump development prospect and the present situation

the development of the water pump, water water pump, development prospect of the development status of pumps

with the continuous development of modern science and technology, in recent years, the development of the water pump in all countries in the world towards seriation, standardization, specialization, large-scale, quick running, rate and automation direction. Seriation, standardization, specialization of

since 1975, our country has made the ISO standard series pump. For example, IS, IH, single-stage single-suction centrifugal pump; Structure, performance is superior to the old type of S type double suction centrifugal pump series; To adapt to the sewage discharge and water supply of large and medium-sized different material used for axial and centrifugal submersible pump; In order to meet the requirements of high-rise building water supply, the introduction of Japan's advanced technology manufacturing of double volute type MS single-suction multi-stage centrifugal pump series; Joint promotion of energy-saving boiler feed pump series; Suitable for metallurgy, chemical industry, light industry, food related anticorrosive, toxic, flammable, precious liquids yuan magnetic drive pump leakage and energy-saving; High-speed pump for pumping high-pressure liquid ( Partial emission pump) ； Nuclear power with one, two, tertiary and ci pump, etc. These products not only meet the needs of the industry, model, series on the job, and there are quite a number of products are energy saving, renew and replace the imported new products. Large-scale, quick running

large pump with high efficiency, high speed pump can narrow the geometry size of the pump, it takes only a small architectural space.

the far the largest axial flow pump production capacity of 6000 kw. Mixed flow pump 7000 kw 8000 kw, centrifugal pump; High pressure boiler feed water pump capacity of 60000 kw. New large flow submersible pumping flow 500 l/s, the corresponding head 1 lom, maximum water yield of 8 m3 / s. These are the trend of widening again, pumping ability is more and more big, so there was a batch of new large water pump station structure, such as & other; Egg & throughout; Form structure of pump station, in and out of the water pipe, chi & pumping station, non-clog pump station. Especially the submersible pump in drainage, promote the use of stains, corresponding appeared a batch of the space is little, less investment, structure the new large and medium-sized water pumping stations, such as steel or reinforced concrete construction to quit wet well type pump structure, etc.

large-scale inevitably leads to high speed. In the 1980 s, the level of the multi-stage sectional centrifugal pump speed 7500 r/min, has now increased to lOOOOr/min, single-stage head to lOOOm above, also greatly reduced, thus making series of corresponding has been greatly shorten the length of the shaft, which makes the shape of the pump greatly reduced size. Currently used in our country imported similar

product speed 4600 r/min. High-speed water pump ( Partial emission pump) Product speed 3000 r/min, the corresponding head above 2000 m. As a result, improve the speed, can reduce the volume, weight, saving material, installation, maintenance is relatively convenient, thus remarkable economic benefit.

due to the steam turbine speed, but also can direct drive, so, at present, a lot of large foreign unit of feed water pump driven by steam turbine. Driven by steam turbine, can improve the thermal efficiency and power output of the unit. Compared with the motor drive, when load reduced, in the output power of power supply and reduce heat loss, etc. Rate

for large capacity pump, rate is of great significance. The current batch of world each item in the hydraulic model of the rate of development of higher education, our country has a lot of work on this, the product efficiency generally.

in pump design, manufacture, to further research and produce a batch of high efficiency, work more flexible, good performance, reasonable structure, a new type of pump. At present domestic water system efficiency is not high enough, such as single stage single suction centrifugal pump efficiency generally below 60%, in which large pump is only 60% ~ 80%; Double suction centrifugal pump efficiency is commonly 70% ~ 85%, and the larger pump working condition of the individual can amount to 90%. In addition, the water pump is used in water supply and drainage engineering, water pump working condition point moving range is larger, there is not enough adjustment measures is simple economic, and if you can on the water pump performance improvements will be made significant energy saving effect.

in the modelling of the pump, should be further discussed. Running at present, the water pump assembly efficiency is low, compared with foreign advanced level gap is bigger, in addition to the objective cause make point moving distance, one of the main reasons is the pump selection basis, the selection method is an old-fashioned, too few chances in the engineering design point, the pump efficiency is low, in the long run is not widespread variable speed regulation and variable valve and formed a large line loss, lower the line efficiency. Automation

with the continuous development of science and technology, automatic detection technology, automatic control technology and electronic computer not only has been gradually used in pump design, manufacturing process, but also increasingly widely used in the pump on the run and test device. For example, automatic start-stop of pump; Parameters such as pressure, flow, temperature automatic detection, display and control; Main parameters of the upper and lower alarm, protection, etc. In short, automation level as the unit of large capacity and high speed development and improve continuously.

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