Fluid magnetic sealing technology is developed on the basis of magnetic fluids. When a magnetic fluid is injected into a gap with a magnetic field, it can fill the entire gap and become a liquid "O-ring". Block the gap to achieve the purpose of sealing.

The magnetic fluid vacuum feed device is a device for introducing rotational motion into a vacuum vessel, which is basically constituted by a permanent magnetic field, two magnetic poles, a magnetic rotating shaft and a magnetic fluid. The drive shaft is a multi-stage structure consisting of a magnetic pole and a rotating shaft. In each annular gap, it is filled with magnetic fluid. Ideally, all fluid magnetic seals form a series of "magnetic fluid seals" between each stage and the pole。
characteristic：
The sealing degree is good: the magnetic fluid surrounds the entire rotating shaft and becomes a sealing ring for insulating elements such as air, moisture, smoke, etc., and has almost no leakage characteristics, and the leakage of the sealing ring is weak enough to be measured。
Good reliability: the seal consists of a permanent magnet structure and a stable magnetic fluid, so mechanical wear only occurs on the bearing。
Long-life characteristics: "Liquid O-ring" consists of a stable magnetic fluid that can be used for 10 years without maintenance。
No wear: Because the seal is wear-free, no particles are generated, which reduces the pollution of the whole system, and the low air pressure makes the seal easy to maintain, and the vacuum can be controlled at 10-8 Torr.

High-speed rotation capability: the extremely low viscous resistance of the magnetic fluid and the structure of the magnetic fluid that does not need to contact the seal ring, which determines its stable operation and high-speed rotation。