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Shaft sealing device with magnetic fluids

A magnetic fluid and shaft sealing technology, which is applied in the direction of engine sealing, engine components, mechanical equipment, etc., can solve the problem of the increase in the radial size of the annular seal gap, the reduction of the pressure bearing capacity of the magnetic fluid shaft seal, and the pressure bearing of the magnetic fluid shaft seal. The effect of reducing uneven distribution, simplifying the installation process, and reducing the accuracy of coaxiality

Inactive Publication Date: 2014-12-03
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A significant increase in the radial dimension of the annular seal gap will cause a significant decrease in the bearing pressure of the magnetic fluid shaft seal. The radial dimension of the gap increases significantly, which causes the pressure bearing capacity of the magnetic fluid shaft seal to decrease

Method used

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  • Shaft sealing device with magnetic fluids
  • Shaft sealing device with magnetic fluids
  • Shaft sealing device with magnetic fluids

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Effect test

Embodiment 1

[0023] A magnetic fluid shaft seal device, such as figure 2 As shown, it is a magnetic fluid shaft sealing device for sealing water on a water pump. The device is mainly composed of a rotating shaft 1, a non-magnetic metal shell 2, a magnetic pole, a permanent magnet 5, a magnetic fluid 6, a rubber ring and sealing pole teeth The ring consists of 10. Among them, such as Figure 4 As shown, each magnetic pole is ring-shaped and composed of two semi-annular magnetic poles. Sealing pole teeth are processed on the inner circumference of the magnetic poles. The two magnetic poles are the first magnetic pole 3 and the second magnetic pole 4 respectively; the three rubber rings are These are "O"-shaped rubber rings, which are respectively the first rubber ring 7, the second rubber ring 8 and the third rubber ring 9.

[0024]In the magnetic fluid shaft sealing device, the non-magnetic metal shell 2 is used to fix the various components of the magnetic fluid shaft sealing device, an...

Embodiment 2

[0045] Sealing pole ring 10: inner diameter=25.6mm. All the other are with embodiment 1.

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16J15/43F16J15/54
Inventor 赵修臣王玉锋刘颖李红温术来
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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