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In 1832, Faraday first proposed the issue of magnetohydrodynamics. He measured the potential difference between the two banks of the Thames River based on the idea of cutting the Earth's magnetic field by seawater to generate electromotive force, hoping to measure the flow velocity. However, due to the high resistance of the river, weak Earth's magnetic field, and poor measurement technology, his goal was not achieved.
In 1937, Hartmann conducted quantitative experiments on the flow of mercury in a magnetic field based on Faraday's idea and successfully proposed a theoretical calculation method for viscous incompressible magnetohydrodynamic flow (i.e. Hartmann flow).
Subsequently, more and more scientists began to pay attention to this field. However, magnetic constraints are not easily stable, so studying magnetic flux
The stability of body mechanics has become a crucial issue. Until 1951, Lundquist gave a stability criterion, which
The research on the topic is still very active to this day.
The true application and development of magnetic fluids can be traced back to 1965. NASA, in order to solve the problem of rotating and sealing the helmet of astronaut spacesuits, applied magnetic fluids to the aviation field by S.S. Pappe1. In 1966, Runzo Iizaka of Tohoku University in Japan also successfully developed magnetic fluids, which began the widespread application of magnetic fluids. After the successful development in the United States and Japan, people have extensively explored and studied the special properties of magnetic fluids, and applied them in scientific experiments and industrial devices.
Zhao Qiang's research and development of magnetic liquid sealing technology originated in 2012. Yan Zhaoqiang, Chairman of Zhao Qiang Titanium Magnetic Technology, learned about magnetic liquids during a business trip. For Yan, who has been engaged in sealing technology research and development for many years, this magical liquid has aroused his strong research interest. The sealing effect of the liquid is undoubtedly higher than other sealing equipment under most working conditions, Especially since liquids have better wear and corrosion resistance, Mr. Yan has embarked on the research and development path of "magnetic liquid sealing technology".
In 2015, magnetic liquid sealing technology began to be put into the market application stage, and cooperation agreements were reached with leading chemical enterprises such as Hualu Hengsheng and Wanhua Chemical to conduct practical application testing and achieve good application results.
In 2019, the magnetic fluid sealing technology won the "National Second Prize for Technological Invention", and subsequently received the "China Equipment Management Innovation Achievement Award" issued by the China Equipment Association. In 2020, the "Magnetic Fluid Sealing Technology Center" was authorized by the China Petroleum and Petrochemical Engineering Research Association and registered a national invention patent in Japan. The magnetic fluid sealing technology officially entered the public eye.
As one of the five national awards issued by the State Council, the the State Technological Innovation Award is mainly awarded to Chinese citizens who have made major technological inventions such as products, processes, materials and systems by using scientific and technological knowledge. The award principles are: (1) previous inventions have not been made or have not been disclosed; (2) Progressiveness and creative; (3) After implementation, creating significant economic or social benefits is indispensable, among which the most representative is Mr. Yuan Longping's indica hybrid rice project, which has also won this award.
This award is undoubtedly the highest recognition for the magnetic liquid sealing technology developed by Zhaoqiang. After years of research and market application, Zhaoqiang Titanium Magnetic Technology has provided magnetic liquid sealing product solutions for leading enterprises in various industries such as petrochemical, fine chemical, pharmaceutical, pesticide, food, electricity, metallurgy, shipbuilding, aerospace, and other multiple working conditions, greatly reducing equipment investment and production and operation costs for enterprises.
Sealing technology determines the safety, reliability, and durability of chemical equipment operation. According to statistics from the International Lubrication Association, "70% of accidents in the chemical industry are caused and exacerbated by sealing," indicating that achieving zero leakage in equipment sealing systems is an important guarantee for ensuring safe production in the chemical industry. Magnetic fluid sealing technology is currently a technological revolution in the traditional sealing industry and is recognized as a "zero leakage" sealing technology worldwide. Compared to traditional mechanical seals, magnetic fluid seals have many advantages such as small sealing space, zero leakage, maintenance free, no wear, no need for auxiliary systems, and can self repair.
Magnetic fluid sealing is the use of a rotating magnetic field circuit formed between a magnet, a magnetic pole shoe, and a magnetic shaft sleeve, firmly adsorbing the magnetic fluid material between the tip of the pole shoe and the shaft sleeve, forming a fluid ring similar to an O-ring. The magnetic fluid fills the gap and completely blocks it, achieving the ultimate sealing purpose. At the same time, due to the acid and alkali resistance characteristics of magnetic fluids, they are toxic, harmful, flammable, and explosive gases, liquids, powders, etc. in industrial production Production scenarios that require media isolation, such as vacuum, have better usage effects.
In addition to differences in materials and principles, magnetic fluid seals have many advantages over traditional mechanical seals under different working conditions and operating conditions.
In the field of traditional seals, large multinational corporations have an increasingly high monopoly position due to their technological research and development, financial talent advantages, and the domestic market is still in a passive state where most high-end seal products still rely on imports. Compared with foreign solutions, the magnetic liquid seal products developed by Zhaoqiang have advantages such as lower cost and better performance. The emergence of magnetic fluid seals is conducive to ensuring the safety of major equipment in China, seizing the international high ground of magnetic fluid seal core technology, which is not only a major national demand but also of significant political significance.
