The characteristics of the history of the development of magnetic pumps: widening application areas, improve technical performance 1 Magnetic drive is the most effective and safe sealing solution Permanent magnet drive that is, the permanent magnet coupling For machinery that needs to be sealed, the harmful, toxic, polluting, dangerous, Pure, expensive products and processes are one of the safest solutions, and have a wide range of applications. Most liquids in the petrochemical, pharmaceutical, film, electroplating, nuclear power and other industries are corrosive, flammable, explosive, poisonous, expensive and spillage will lead to the waste of working fluid and environmental pollution; vacuum, the semiconductor industry to prevent the outside world Gas intrusion: diet, medicine to ensure the purity of the media. Permanent magnet drive technology has found its way in these areas. British Machinery Development Company Limited (HMD) since 1946 committed to the manufacture of sealless magnetic pump, so far in 37 countries around the world have sold nearly 70,000 units, annual sales of 28 million pounds. A pharmaceutical factory in the United States has hundreds of centrifugal magnetic pumps equipped with mechanical seals to deal with a variety of acids. These magnetic pumps often run dry due to design problems and can only be destroyed within 2 to 3 months by switching to Ansimag Production K1516 series of magnetic drive pump, put into operation in 1993 (4.8 hours a day operation 365 days a year) until 1998 is still running. Synthetic caustic soda is a big problem for rotary vane pump seals in the Midwest container mills where engineers describe the pumps as "maintaining the darkness of the night" with Ansimag's ETFE-lined, sealless magnetic pump running 11 Month without downtime. A large-scale chemical plant in the United States is facing serious difficulties in transporting methanol. Because of methanol flammable, close to boiling 60 ℃, the flow rate of only 7m3 / h, the pressure difference up to 250m. The problem is solved by Dickow magnetic drive multi-stage suction pump, its flow is 15m3 / h, pressure 400m, to ensure zero leakage of methanol to ensure operator and factory safety and to solve the methanol bubble Delivery problem. 2 magnetic pump to the technical performance of micro-, large-scale development to meet the needs of domestic and foreign markets, petrochemical companies complete sets of equipment to the large-scale development, China must have a batch of annual output of 10 million tons refinery, million tons of ethylene Device. Mechanical equipment to meet the heavy load, long cycle, low energy consumption, and in line with environmental requirements. My country found in imitation of foreign products, manufacturing magnetic pump material and process requirements are high. Even 11 ~ 13kW medium and small power magnetic pumps, the reliability of manufacturing costs can not be accepted by users. For strong corrosion, high pressure, high temperature magnetic power pump is still blank. At present, the development limit of the magnetic pump should be described by HMD's products: flow rate from 1m3 / h to 681m3 / h, pressure drop from 10m to 500m, temperature range from -100 ℃ to 450 ℃, system pressure from vacuum to 400bar, Motive power up to 350kW. Micro-magnetic pumps are specifically developed for research and development in certain sectors, such as laser cooling, analytical instrumentation, chemical replenishment, bioengineering, cooling cycles, and printer nozzles. Gear pump and motor closed integration, suitable for 24V, 36V DC power supply, speed manual automatic control. The minimum flow rate is 10ml / min and the pressure difference is 7bar. Japan Iwaki company electroplating, cooling cycle MD series of miniature magnetic transmission gear pump flow range is 7.5 ~ 288L / min, transmission power 1/25 ~ 1/3 horsepower. 3 various types of centrifugal pumps can be transformed into a magnetic pump Centrifugal pump is the leading product of magnetic pumps, magnetic drive rotary displacement magnetic pump although 25 years of history, only in the past seven or eight years in the design and manufacturing level and high torque capacity There is a wide range of foundations. The focus is magnetic transmission gear pump and screw pump, the maximum transmission capacity of 400Nm, speed 3500r / min power of 150kW. Located in the United States borders the Judea gas power plant, the turbine compressor lubrication pump is a normal-track external gear pump. Gear pump due to high pressure on average every two months will be excessive wear and scrap, causing the compressor to shut down. After the switch to magnetic three screw pump in 1992, has been continuous operation, without any maintenance. Tuthill UK has successfully applied its magnetic drive gear pump to Scottish's process water system as a magnetic pump additive that replaces the screw pump and meets health and safety regulations. 4 Magnetic Drive Compressor Magnetically shielded inner bearings are located in a sealed space that is lubricated and cooled with a sealed medium. In view of the level of material manufacture in China, magnetic transmission has not been applied in gas conveying machinery. Canada Nova Magnetic Co., Ltd. produced overpressure fan, the helium pressure 170bar, the leak rate of 1cm3 / h, bearing life of more than 10000h. Another series of pressurized fan, the free discharge of flow 750m3 / h, 400m3 / h flow system pressure 35MPa, to achieve zero leakage. In addition, the special characteristics of magnetic drive also applies to leak-free blenders, valves and other equipment. The application of the freezer has not been related to information, the author is to achieve the magnetic drive applied to the refrigeration compressor is being explored, due to the leakage of refrigerants, especially Freons can cause serious environmental problems.