Magnetic liquid sealing and brush type sealing composite device

Abstract

The invention discloses a magnetic liquid sealing and brush type sealing composite device, and belongs to the field of mechanical engineering sealing. The composite device solves the problem that in the case of an existing magnetic liquid seal, under the condition that the pressure fluctuation of a sealing medium is large, after the pressure of the sealing medium exceeds the limit pressure resistance value of the magnetic liquid seal and efficiency is lost, a large number of sealing medium leaks. According to the magnetic liquid sealing and brush type sealing composite device, a front baffle plate (6), a middle baffle plate (9) and a rear baffle plate (14) are made of non-magnetic materials, so that the effect of magnetic isolation rings is achieved, and the flux leakage of a permanent magnet can be effectively reduced; a labyrinth sealing structure with flat teeth or high-low teeth is machined in the middle baffle plate (9), the height of a gap between the tooth top of each labyrinthsealing tooth of the middle baffle plate (9) and a rotating shaft is 0.15-0.3 mm, and labyrinth sealing can further prevent leakage of the sealing medium to the outside D; and in the case of the composite device, a gap between a left pole shoe (5) and a right pole shoe (13) is utilized, therefore, the axial length and the radial height of the sealing device are not increased, the impact resistanceand reliability of the magnetic liquid seal are improved, and the application range of the magnetic liquid seal is further expanded.

Description

technical field [0001] The invention belongs to the technical field of mechanical engineering seals, and is especially suitable for gas seals with large pressure fluctuations of the seal medium. Background technique [0002] Magnetic liquid sealing technology is used by more and more industries due to its advantages of zero leakage, no wear, long life and simple structure. When the magnetic liquid seal is used to seal toxic and harmful gases, once the pressure of the sealing medium fluctuates greatly, the magnetic liquid seal may be damaged and cause serious leakage accidents. The magnetic liquid sealing device described in the existing patent with the publication number CN101799075A has no impact resistance performance. Once the on-site employees improperly operate and cause the pressure of the sealing medium to exceed the ultimate pressure resistance value of the magnetic liquid seal, the magnetic liquid seal will fail and the sealing medium will be large. Leakage will ca...

AI Technical Summary

Problems solved by technology

When the magnetic liquid seal is used to seal toxic and harmful gases, once the pressure of the sealing medium fluctuates greatly, the magnetic liquid seal may be damaged and cause serious leakage accidents

The magnetic liquid sealing device described in the existing patent with the publication number CN101799075A has no impact resistance performance. Once the on-site employees improperly operate and cause the pressure of the sealing medium to exceed the ultimate pressure resistance value of the magnetic liquid seal, the magnetic liquid seal will fail and the sealing medium will be large. Leakage, causing great harm to human body and environment

Another example is a magnetic liquid sealing device with a labyrinth structure on a magnet with publication number CN204267737U. Although the device processes a labyrinth seal structure with high and low teeth on the magnet, it can reduce the leakage of the sealing medium to a certain extent, but the labyrinth seal The leakage rate itself is relatively large, and the leakage of the sealing medium cannot be effectively controlled. At the same time, processing the labyrinth seal on the magnet will greatly increase the axial length of the entire sealing device, which will increase the volume of the entire sealing device, which not only wastes materials, but also It is not conducive to installation and disassembly, because the gap height between the permanent magnet and the rotating shaft is relatively large, and the leakage rate of the labyrinth seal itself is relatively large, the throttling effect is not obvious

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