The water ring vacuum pump status quo, development trends and design and development of several views It is well known, due to the water ring vacuum pump and water ring compressor has the advantages of simple structure, easy to use and maintenance, which in all walks of life has been widely used. 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. 1 large-scale Due to the development of the coal mine, chemical industry, pharmacy and paper making industries, the demand for water ring vacuum pumps has become more and more large-scale. 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 up to hundreds of units, these products are mainly used in: (1) Coal mining industry As the state has stepped up its safety requirements for coal mines, pumping water gas vacuum pumps, especially large-scale water ring vacuum pumps, has become a mandatory safety requirement in the coal mining industry. For example, the number of pumping units ordered by a mining bureau in Shaanxi Province last year was more than 400m3 / min large water ring vacuum pump is used to extract gas, and some large coal mines use more than 100m3 / min up to 7-8 sets of pumps. 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 mining 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 development. In the 1980s, most SZ-4 water ring vacuum pumps with a pumping volume of 27 m3 / 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 transformation projects. The actual projects of these projects require a large amount of PVC materials, especially real estate, which has further promoted the development of the PVC industry. According to the requirements of the chlor-alkali industry Statistics show that China produced 4.1 million tons of PVC 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. Chlor-alkali business development, water and air pumps and water ring compressor must be matched j to pump and compress acetylene and hydrogen water ring vacuum pump and water ring compression In the past the largest but also 30m3 / min, and now with an annual output of 100,000 tons of 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 of 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 unit 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.