Pump is accompanied by the development of industrial development. 19th century, foreign countries have a more complete pump type and variety, and has been widely used. According to statistics, in about 1880, the general purpose centrifugal pump production accounted for more than 90% of the whole production, while the power plant with pumps, chemical pumps, pumps for mining and other special purposes, only about 10% of the overall pump production. By 1960, the general-purpose pumps accounted for only 45Y002Ea, while the special-purpose pumps have accounted for 55% o2Ea.
Relative to developed countries, China's water pump industry is still relatively backward. But the people concerned pointed out that China's water pump industry has the possibility of using the latecomer advantage to achieve leapfrog development.
Pump technology development trend analysis of domestic submersible electric pump industry development trend
As the submersible electric pump itself and the choice of submersible electric pump pump station has many advantages, therefore, the future demand in China will continue to grow, and has the following main development trend.
Twenty-first century, people in the environmental protection, electronics and other fields of high-tech development and the world's sustainable development is the background of the huge demand, for the pump industry, including many industries or fields have brought about rapid technological change and development. Pump manufacturers to lead the trend of the domestic pump industry, accurate grasp of the pump technology development trend is the basic function. The development of pump technology, as in the development of other industries, is driven by the market demand. Pump technology development trend, we can see a glimpse of the world of fluid from walking into the on the Volvo fluid technology.
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From the current point of view: with the continuous development of the country, the national income is constantly improving. Products made of stainless steel materials because of its long service life, not easy to rust, clean and sanitary, green and other excellent features have slowly into the industrial applications, stainless steel submersible sewage pump is one of the best. Over the years is into millions of families, dining tables, baths and other places can be seen everywhere the figure of stainless steel. China's current stainless steel consumption of 3.4kg per capita, is already the forefront of developing countries, and even reached the amount of developed countries, and also in the annual increase in the rate of 6.43%. Because of its own material heat resistance, wear resistance, corrosion resistance and other excellent new energy, has also been on the stage of petrochemical, mining, electric power and other large industries. This brings new vitality and opportunities to the manufacture of stainless steel submersible sewage pumps, but also brings certain challenges, the current manufacturing above the technical barriers, there are still waiting for industry professionals with a more professional attitude, more scientific spirit to answer one by one.
The correct installation and use method is that the suction pipe of the centrifugal pump must be installed with a bottom valve at the bottom of the pool, and the whole pump body and the inlet pipe must be filled with water before starting. The cavitation margin of each single-stage centrifugal pump model can know the effective self-priming height of the centrifugal pump.
When the non-negative pressure frequency conversion water supply equipment is put into use, the water from the tap water network enters the steady flow tank, the air in the tank is discharged from the vacuum eliminator, and the vacuum eliminator is automatically closed after the water is filled. When the pressure of the tap water network can meet the requirements of water use, the system is supplied directly to the water network by the bypass check valve; when the pressure of the tap water network cannot meet the requirements of water use, the system pressure signal is fed back to the frequency controller by the remote pressure meter, and the pump runs and automatically adjusts the speed of constant pressure water supply according to the size of the water consumption; if the running pump reaches the working frequency speed, another pump is started to run with frequency. When the water is supplied by the pump, if the water volume of the tap water network is greater than the flow of the pump, the system will maintain normal water supply: at the peak of water consumption, if the water volume of the tap water network is smaller than the flow of the small pump, the water in the flow stabilization tank can still provide normal water supply as a supplementary water source. After the peak of water consumption, the system returns to normal water supply. When the water supply network stops, causing the liquid level of the stabilized tank to drop, the liquid level detector will feedback the signal to the frequency controller, and the pump will stop automatically to protect the pump unit. When the water supply is small at night and the pressure of the water pipe network cannot meet the requirements, the air pressure tank can store and release energy to avoid frequent pump start.
Pump power consumption accounts for 30% - 50% of the cost of water plant water production, how to reduce electricity consumption to reduce costs is the problem of each water plant is committed to research, this paper through specific examples of preliminary discussion on how to reasonably match the pump to achieve the purpose of energy saving and consumption reduction.
The rapid opening and closing of the valve on the pipeline will produce the phenomenon of water impact, and a water impact pressure value is generated at the section of the pipe immediately adjacent to the valve.