Concentric biaxial magnetofluid seal transmission device

Magnetic liquid is a kind of suspended colloid with solid and liquid mixed, which is formed by adding magnetic nanoparticles into the carrier liquid and dispersing evenly into the carrier fluid by use of a surface-ctive dispersant. Magnetic liquid both has the fluidity of liquid and magnetism, and its sealing technology is realized by taking advantage of the response characteristics of magnetic liquid to the magnetic field. When we inject this magnetic liquid into the gap of the magnetic circuit consisting of permanent magnets with high performance, and pole shoes with good magnetic permeability and axis, magnetic fluid in the gap will form some "O" circles of liquid under the the action of magnetic field. Its quantity and design move slightly in the non-uniform magnetic field, forming magnetic force against the differential pressure to achieve a new equilibrium and play the role of sealing.

Leak proofs of "zero" leak: under the action of magnetic force, magnetic fluid forms an "O" circle of liquid, filling the gap between the spindle and pole shoe, seriously hindering the flow of gas, to achieve the stable dynamic and static sealing effect. Its leakage is so weak that even under the condition of 1X10-12Pa-m%/sec, an amas spectrometer can not detect it.
Stable and reliable performance, long service life: due to the base fluid of magnetic fluid being an inert, stable aliphatic organic material with low vapor pressure and low volatilization, its normal working life is generally more than five years.

High reliability, non-directional seal: when magnetic liquid seal element produces transient over-oltage breakdown under the condition of positive pressure, once the pressure is reduced to the degree that magnetic force can withstand, magnetic fluid quickly recovers the sealing effect under the action of magnetic force. The reliability of its use is quite high and both ends of magnetic fluid can be arbitrarily pressed, so there is no direction.

Low friction, low wear, low fever, low block, no pollution: because the axis rotates ni magnetic fluid, there is small friction, no fever, no block for the transmission of torque, small power loss, and no mechanical wear ni magnetic liquid itself, magnetic fluid saturation, low vapor pressure, and even in the high vacuum condition, the use of it also will not produce pollution. There are two motion forms, which si rotation type and reciprocating movement. Seal size ranges from 06 to ® osmm.