The magnetic fluid seal of vacuum coating machine is restricted by the following conditions when working:
       Magnetic fluid seal limit condition 1: evaporation. The magnetic fluid is composed of magnetic particles, surfactant and carrier liquid. The evaporation of carrier liquid is the main factor that determines the limit rotation frequency and service life of the seal. Because the seal works with limited magnetic fluid. In order to ensure high sealing efficiency, a carrier liquid with low vapor pressure should be selected to minimize the evaporation loss.

       The second limit of magnetic fluid sealing: temperature rise, temperature rise will cause magnet demagnetization and magnetic fluid evaporation. Because the temperature increases, the viscosity decreases, and the power consumption decreases, which is a positive side. However, the increase in temperature and the decrease in magnetic saturation may also reduce the pressure resistance of the seal. Therefore, the temperature of the magnetic fluid should generally not be higher than 105°C, otherwise cooling measures should be adopted.

       Magnetic fluid seal limit condition 3: Ultimate vacuum degree. The ultimate vacuum degree of magnetic fluid seal depends on the volatility of the carrier liquid. The carrier liquid made of two grease lubricants can meet the requirements of 1.333×10-7 Pa ultra-high vacuum technology.
       Limit condition four of the magnetic fluid seal: peripheral speed. Generally, the magnetic fluid seal is suitable for the operation at a high peripheral speed of 30m/s or more, and there is no limit mark. However, considering the temperature and heat dissipation of the magnetic fluid seal, the circumferential speed should be limited to 60-80m/s, and the ultimate pressure capability should also be considered at this time.
       Guangdong Huicheng Vacuum has been specializing in the manufacture of various vacuum coating application equipment for many years. For many years, it has been committed to the development and production of vacuum coating machines. With the latest technology, it has continuously manufactured vacuum coating machines that meet the needs of the market and provided customers with customized process solutions. And machine.