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What is the purpose of the vacuum pump? Which industry is applicable?

As we all know, because the water ring vacuum pump and water ring compressor has a simple structure, easy to use and maintenance features, and thus in all walks of life has been widely used. Especially with the characteristics of isothermal compression, easy to smoke, compressed flammable and explosive gas. Here on its development and design and development to talk about a few superficial views.
1 large
As the coal, chemical, pharmaceutical, paper and other industries, the requirements of the water ring vacuum pump more and more large-scale development. Before 2000, China can produce pumping gas in the 100m3 / min above the water ring vacuum pump only 3-4 enterprises, the national annual output but also dozens of units. And only three years, to the country in 2003 to produce more than 100m3 / min large pump manufacturers of more than 10 (of which only Zibo region there are 7-8), according to incomplete statistics, the country's large pump Production of several hundred or more, these products are mainly used in:
(1) coal industry
As the state to strengthen the safety requirements of the coal mine, so the use of water ring vacuum pumps, especially large-scale water ring vacuum pump to remove gas gas has become a coal industry safety requirements, such as last year, a mining company in Shaanxi ordered more than 400m3 / Min large water ring vacuum pump is used to remove gas gas, and some large coal mines use 100m3 / min above the large pump up to 7 - 8 units. With the country to further strengthen the safety work, large, large water ring vacuum pump in the coal mine system will be more and more widely used.
In addition, due to the rapid increase in coal production, coal washing and coal preparation used in the vacuum filter to large-scale development in the eighties most with pumping capacity of 27m3 / min SZ-4 water ring vacuum pump, which Was also larger at the time. In recent years, coal mine filters are equipped with pumping capacity of 80--150m3 / min large-scale water ring vacuum pump, and some reach 200m3 / min or more, but also continue to increase the trend of gas.
(2) chemical industry
A) chlor-alkali industry
In recent years, China has launched a number of large-scale infrastructure and technological transformation projects, these projects are a lot of people need a large number of PVC materials, especially the prosperity of real estate, but also to promote the development of the PVC industry, according to the chlor-alkali industry Statistics, China last year produced 4.1 million tons of PVC, imports of 200 tons. According to the industry's forecast, the national demand in 2005 will reach 8 million tons, and by 2010 will reach 15 million tons, it is because of the rapid increase in demand, making China's chlor-alkali industry enterprises to increase production and expansion, and One or two years on a lot of new businesses. Chlor-alkali enterprise development, must be supporting the water pump and water ring compressor j to extract and compress acetylene and hydrogen water ring vacuum pump and water ring compressor in the past but also the largest 30m3 / min, and now an annual output of 100,000 tons Caustic soda and 100,000 tons of PVC enterprises, the need for water ring vacuum pump and water ring compressor up to 70m3 / min or more.
 
It is important to introduce here that it is precisely because of the development of this industry, to promote and accelerate the development and production of higher I hydraulic ring compressors. For a long time, China's water ring compressor is generally when the suction pressure is 1 atmosphere or slightly lower than the pressure, the pressure is 0.1MPa, that is, the compression ratio of 2, the individual enterprises to produce the pressure of 25MPaG water ring compression Machine, and only 1 - 2 specifications. In order to adapt to the production of PVC, 91 the State Council major equipment in the "eight five" major technical equipment research project - an annual output of 4 tons of low polymerization degree of PVC equipment equipment developed in the vinyl chloride recovery water ring compressor Development of research topics, this recovery of vinyl chloride monomer water ring compressor requirements in the suction pressure at atmospheric pressure or micro-negative pressure, the discharge pressure to reach 0.55-0.6MPaG, and the displacement to reach 700m3 / min. After several years of efforts, our company in December 1996 by the former State Ministry of Machinery Organization of the technical appraisal, customer service technology has reached the critical requirements. In this product on the basis of my company has developed a series of products, displacement from 90m3 / min to 2000m. / H. As the equipment is one of the key equipment in the PVC industry, this water ring compressor has been popularized and applied in the last few years of the national large PVC project, completely replacing the import.
B) Fertilizer industry
Fertilizer industry, especially the production of phosphate fertilizer is also the focus of China's macroeconomic regulation and control of the industry, due to the new projects and technological transformation of the old enterprises are above the level, the scale of the main, so large, large water ring vacuum pump also received Application, such as Yunnan, a phosphate fertilizer business transformation of a new pumping capacity of 300m3 / min large water ring pump 3.
In addition, there are many phosphate fertilizer process requirements in the pressure for the absolute pressure 80 - l00hPa, still have a greater pumping capacity, and thus two-stage water ring vacuum pump and atmospheric jet with two-stage water ring vacuum pump used in this Kind of conditions, it has a unique advantage, many fertilizer companies out of the vibration and noise and high vacuum reciprocating vacuum pump, with two water ring vacuum pump instead, and received a better effect, it can be said that two water ring Vacuum pumps in the industry will be more and more widely.
C) paper industry
At the end of the last century and the beginning of this century, China's national debt into the paper industry occupies a large proportion of the paper mills across the country scrambling to transform the level, on the scale, which greatly stimulated the development and production of large water ring vacuum pump, A transformation of the pumping capacity of 400IIl3 / min large water ring vacuum pump (currently China's largest production of water ring vacuum pump) 6, with a total power of 400kW. It can be said that in recent years the pumping capacity of 100m3 / min or more large-scale water ring vacuum pump 50% is used in the paper industry, and this trend is increasing.

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