Shaft sealing device with magnetic fluids

A magnetic fluid and shaft sealing technology, applied in the direction of engine sealing, engine components, mechanical equipment, etc., can solve the problem of reducing the pressure bearing capacity of the magnetic fluid shaft seal, increasing the radial size of the annular seal gap, and reducing the bearing pressure of the magnetic fluid shaft seal. It can solve the problems such as reducing the value of the installation process, reduce the uneven distribution, and reduce the accuracy of the coaxiality.
CN102537367AInactive Publication Date: 2012-07-04BEIJING INSTITUTE OF TECHNOLOGYGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING INSTITUTE OF TECHNOLOGYGY
Publication Date
2012-07-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a shaft sealing device with magnetic fluids, which is characterized in that based on an existing shaft sealing device with magnetic fluids mainly comprising a rotating shaft, a non-magnetic metal shell, magnetic poles, a permanent magnet, the magnetic fluids and a rubber ring, sealing pole teeth made of soft magnetic materials are additionally arranged in sealing pole tooth grooves of the magnetic poles, a sealing pole tooth ring is sleeved on the rotating shaft, the inner diameter of the sealing pole tooth ring is 0.1-0.6mm larger than the diameter of the rotating shaft, the outer diameter of the sealing pole tooth ring is 0.1-0.3mm smaller than the inner diameter of each tooth groove, the thickness of the sealing pole tooth ring is 0.1-0.3mm smaller than the width of each tooth groove, the magnetic fluids are distributed in an annular sealing gap between the rotating shaft and the sealing pole tooth ring, and each magnetic pole comprises two half annular magnetic poles. The positions of the sealing pole teeth of the device can be changed radially along the rotating shaft to adjust coaxiality of the rotating shaft and the sealing pole teeth, uneven distribution of the annular sealing gap in the circumferential direction of the rotating shaft is decreased, reduction of the pressure bearing capacity of the device and abrasion of the rotating shaft and the sealing pole teeth are avoided, and the requirements of sealing components on machining and mounting precision are lowered.
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Description

technical field

[0001] The invention relates to a magnetic fluid shaft sealing device, in particular to a magnetic fluid shaft sealing device which can automatically adjust the coaxiality between a sealed rotating shaft and a sealing pole gear ring, and belongs to the technical field of magnetic fluid sealing. Background technique

[0002] Magnetic fluid, also known as magnetic liquid, ferrofluid or ferrofluid, is a new type of functional material, which has both the fluidity of liquid and the magnetism of solid magnetic materials. It is a stable colloidal liquid formed by mixing magnetic solid particles, base carrier liquid (also called media) and surfactant. Ferrofluid has no magnetic attraction when it is static, and it shows magnetism when an external magnetic field is applied. It has a wide range of applications in practice and can be applied to ferrofluid seals under various harsh conditions. When the magnetic fluid is injected into the gap of the magnetic field, it c...

Claims

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