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Magnetic liquid sealing device with heating by electromagnetic waves

A magnetic liquid and sealing device technology, which is applied in the direction of engine sealing, engine components, mechanical equipment, etc., can solve the problems of shaft speed reduction and safety performance reduction

Inactive Publication Date: 2011-06-22
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This torque increase causes the shaft speed to decrease
In addition, the increase in torque will also lead to a decrease in the safety performance of the shaft

Method used

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  • Magnetic liquid sealing device with heating by electromagnetic waves
  • Magnetic liquid sealing device with heating by electromagnetic waves
  • Magnetic liquid sealing device with heating by electromagnetic waves

Examples

Experimental program
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Embodiment Construction

[0024] The present invention will be further described with accompanying drawing as specific embodiment:

[0025] A magnetic liquid sealing device with electromagnetic wave heating, such as figure 1 , the sealing device includes: a metal sleeve, a sealing space, a bearing, a pole piece, a transmission shaft, a permanent magnet, a magnetic fluid, and a screw.

[0026] The transmission shaft 8 of the sealing device, such as Figure 5 , it is a stepped shaft including the first shaft shoulder 15, the first pole piece 5, the intermediate shaft diameter 17, the second pole piece 6 and the second shaft shoulder 16; the first pole piece 5 and the second pole piece 6 are transmission shafts 8 steps with the same outer diameter and thickness.

[0027] The first bearing 3 is installed on the first shaft shoulder 15 of the drive shaft, such as figure 1 and Figure 5 .

[0028] The first permanent magnet 13 and the second permanent magnet 9 are semicircular rings with the same struct...

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PUM

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Abstract

The invention relates to a magnetic liquids sealing device with heating by electromagnetic waves. The device belongs to the field of mechanical engineering magnetic liquids sealing. A transmission shaft (8) of the sealing device is a ladder shaft; a first bearing (3) is installed on a first shaft shoulder of the transmission shaft; a first permanent magnet (13) and a second permanent magnet (9) are relatively bonded on an intermediate shaft diameter (17); a second bearing (7) is installed on a second shaft shoulder of the transmission shaft; magnetic liquids (10) are injected on an outer annular surface of the first permanent magnet and the second permanent magnet; a sealing assembly is formed the connections above, and is installed on a step (18) of an inner hole of a metal sleeve (1); an end cover is fixed on the metal cover through a screw (14); and eight circular blind holes which are distributed on the circumference of the metal sleeve are embedded with polyethylene or polypropylene. The problems that the increment of the torque of the transmission shaft and the problem of the safety property reduction of the transmission shaft caused by the increment of the magnetic liquids viscocity under a low temperature are solved.

Description

technical field [0001] The invention belongs to the field of mechanical engineering magnetic liquid sealing, and is particularly suitable for a magnetic liquid sealing device on a radar working in a low-temperature environment. technical background [0002] In practice, the ambient temperature around some radars is very low, and at very low operating temperatures, the viscosity of the magnetic fluid will increase, resulting in an increase in the torque of the shaft, for example: the torque is 1.6kg m at normal temperature, at - At 40°C, the torque will reach 7kg·m. This increase in torque results in a decrease in shaft speed. In addition, the increase in torque will also lead to a decrease in the safety performance of the shaft. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the increase of the shaft torque caused by the increase of the viscosity of the magnetic liquid at low temperature, improve the safety o...

Claims

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Application Information

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IPC IPC(8): F16J15/43F16J15/54
Inventor 李德才王凡
Owner BEIJING JIAOTONG UNIV
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