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As we all know, due to the water ring vacuum pump and water ring compressor has the advantages of simple structure, easy to use and maintenance, which has been widely used in all walks of life. Especially with the characteristics of isothermal compression, easily sucked, compressed flammable gases. Here to talk about its development and design and development of a few superficial views. Large-scale As the coal, chemical, pharmaceutical, paper and other industries, the requirements of the water ring vacuum pump to more and more large-scale development. Before 2000, our country was able to produce only 3-4 enterprises in the water ring vacuum pumps with the pumping volume of more than 100m3 / min. The annual output of the country is only a few dozen or so units. And only three years later, by 2003 the country can produce more than 100m3 / min large pump manufacturers more than 10 (only Zibo area there are 7--8), according to incomplete statistics, the country's large pump Production of several hundred or more, these products are mainly used: (1) the coal mining industry as the country to strengthen the safety requirements of coal mines, so the use of water ring vacuum pumps, especially large-scale water ring vacuum pump gas extraction has become the coal industry must Safety requirements, such as last year, a mining bureau in Shaanxi ordered more than 400m3 / min pumping large water ring vacuum pump is used to extract gas, and some large coal mines use more than 100m3 / min on the pump 7 - 8 units. As the state further strengthens its safety work, large-scale and extra-large water ring vacuum pumps will be more and more widely used in coal mine systems. In addition, due to the rapid increase of coal production, the vacuum filter used in coal washing and coal preparation also went large-scale. Most of the eighties were equipped with SZ-4 type water ring vacuum pump with pumping volume of 27m3 / min It was also larger at that time. In recent years, the coal mine filter are equipped with a large amount of pumping capacity of 80-150m3 / min water ring vacuum pump, and some reached more than 200m3 / min, but also the gas volume continues to increase. (2) Chemical Industry a) Chlor-alkali Industry In recent years, China has launched many large-scale capital construction projects and technological renovation projects. The actual children of these projects require a large amount of PVC materials, especially real estate, and have further promoted the production of polychlorination The development of ethylene industry, according to the statistics of the chlor-alkali industry, China produced 4.1 million tons of polyvinyl chloride last year and 200 tons of imported materials. According to the forecast of the industry, the national demand in 2005 will reach 8 million tons, and by 2010 it will reach 15 million tons precisely because of the rapid increase in demand, making China's chlor-alkali industry enterprises to expand production expansion and near One or two years a lot of new businesses. The development of chlor-alkali enterprises, water and air pumps and water ring compressor must be supporting 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 with an annual output of 100,000 tons Caustic soda and 100,000 tons of PVC companies need water ring vacuum pump and water ring compressor up to 70m3 / min. What needs to be specially introduced here is precisely because of the development of this industry, to promote and speed up the development and production of high I-force water ring compressors. For a long time, China's water ring compressor is generally when the suction pressure is 1 atm or slightly lower than the pressure, the exclusion of pressure O. 1MPa, that is, the compression ratio is 2, and some enterprises have produced water ring compressors with the pressure up to 25MPaG, and only 1-2 specifications. In order to adapt to the production of polyvinyl chloride, the former major equipment office of the State Council proposed in the "85" major technological equipment research project - the research and development of an equipment with an annual output of 4 tons of low-polymerization degree polyvinyl chloride device, proposed the recovery of vinyl chloride water ring compressor Research topics, this recovery of vinyl chloride monomer water ring compressor requires suction pressure at atmospheric pressure or micro negative pressure, the discharge pressure to reach O.55-0.6MPaG, and the displacement to reach 700m3 / min. After several years of hard work, our company passed the technical appraisal organized by the former Ministry of Machinery Industry in December 1996, and the customer technology has reached the key requirements. On the basis of this product, our company has developed a series of products, displacement from 90m3 / min to 2000m. / H. Since this equipment is one of the key equipment in the PVC industry, under the circumstance of the large PVC project in China in recent years, the water ring compressor has been popularized and applied, completely replacing the import. b) Fertilizer Industry The fertilizer industry, especially the production of phosphate fertilizer, is also a key support industry in China's macroeconomic regulation and control. As the technical renovation of new projects and old enterprises are above the level and scale, the large and extra large water ring vacuum pumps This has also been applied, such as a phosphate fertilizer company in Yunnan to a new increase in pumping capacity of 300m3 / min 3 large water ring pump. In addition, there are many technological requirements of phosphate fertilizer companies in the pressure of absolute pressure 80 - lOOhPa, still have a larger pumping capacity, so two water ring vacuum pump and air ejector with two water ring vacuum pump used here Under various working conditions, it has unique advantages. Many Chemical Fertilizer companies eliminated the reciprocating vacuum pump with large vibration noise and high degree of vacuum, replaced the two-stage water ring vacuum pump and received good results. It can be said that the two-stage water Ring vacuum pump applications in the industry will be more extensive. c) Paper industry At the end of the last century and the beginning of this century, China's national debt was heavily invested in the paper industry. Paper mills across the country were scrambling to upgrade the scale and scale of their operations, which greatly boosted the development and production of large-scale water ring vacuum pumps. A transformation of a paper mill in Northeast China 400IIl3 / min pumping large water ring vacuum pump (currently the largest production of water ring vacuum pump) 6, with a total power 400kW. It can be said that in recent years, the pumping capacity of more than 100m3 / min 50% of large water ring vacuum pump is used in the paper industry, and this trend continues unabated. d) Concentration, vacuum dehydration, drying and distillation in the pharmaceutical industry are the main processes of the pharmaceutical enterprises. The technological transformation of the pharmaceutical enterprises is equally on the upper level and on the scale, which is more obvious in some large pharmaceutical companies. In the past, most of them used small pumps of less than 10 m 3 / min, and now large and medium-sized pumps account for the majority of the project bidding in these enterprises with an extraction volume of more than 20 m 3 / min. In addition, many plants in the pharmaceutical industry used to have more two-stage water ring vacuum pumps with a suction volume of 6 - 12 m3 / min, and now both have 20-30 m3 / min two-stage water ring vacuum pumps and some also reach 60 m3 / min For example, a joint venture pharmaceutical factory in Sichuan last ten bid to buy 10 pumps with a pumping capacity of 60m3 / min. In addition to the above industries, the vacuum systems of light industry, food industry, beer industry and metallurgy, power generation, petrochemical and building materials industries all develop to large scale. For example, a certain aluminum plant in Shandong has long been using multiple water rings with an extraction volume of 85 m3 / min Vacuum pump, and last year's technical transformation project bidding equipment required water ring vacuum pump pumping capacity to reach 140m3 / min. 2 Completeness It should be said that in 2000 before the domestic water ring vacuum pump manufacturers are almost all single pump sales, very few users set complete sets of equipment, and the past two years, chemical, pharmaceutical industry, technical transformation project equipment Bidding equipment in a larger and larger proportion, the general requirements with splitters, coolers (heat exchangers), rehydration pumps, valves, meters, fittings and control devices, the formation of closed loop, and the requirements and corporate OCS System connected to the level, pressure, power and other online control.