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Magnetic liquid sealing device with wide temperature applicability

A technology of magnetic liquid and sealing device, applied in the direction of engine sealing, engine components, mechanical equipment, etc., can solve the problems of low rotational torque and low evaporation.

Pending Publication Date: 2020-07-24
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the prior art cannot have both low rotational torque and low evaporation in a wide temperature range

Method used

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  • Magnetic liquid sealing device with wide temperature applicability
  • Magnetic liquid sealing device with wide temperature applicability
  • Magnetic liquid sealing device with wide temperature applicability

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Embodiment Construction

[0014] In order to better understand the improvement made by the present invention compared with the prior art, three specific implementation modes of the present invention will be described in detail below.

[0015] like figure 1 In the shown first embodiment of the present invention, the magnetic liquid sealing device 1 with wide temperature applicability includes: a rotating shaft 11 , a casing 12 , a bearing part 13 , and a magnetic liquid sealing part 14 . The shell 12 is made of non-magnetic material, and the shell 12 is provided with a flange assembly 121 . An end cap 122 is installed at the end of the shell 12, and the end cap 122 is screwed to the shell 12. The bearings 131 and 132 of the bearing part 13 are installed in the casing 12 , and the rotating shaft 11 cooperates with the bearing part 13 and penetrates through the casing 12 along the axial direction of the casing 12 . The magnetic liquid sealing part 14 is composed of a permanent magnet 1401, pole shoes 14...

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Abstract

The invention discloses a magnetic liquid sealing device with wide temperature applicability. The magnetic liquid sealing device comprises a rotating shaft (11), a shell (12), a bearing part (13) anda magnetic liquid sealing part (14); magnetic liquid A (1409 and 1411) is fluorocarbon-based or ester-based magnetic liquid, and magnetic liquid B (1410) is kerosene-based or engine oil-based magneticliquid; the magnetic liquid A (1409) is injected into pole teeth (1406) corresponding to pole shoes (1403) adjacent to a sealing space, and the magnetic liquid B (1410) is injected into at least onestage of pole teeth (1407 and 1408) corresponding to the other pole shoes (1404 and 1405). With the structure, the magnetic liquid sealing device has a low rotational torque under a working conditionof low temperature and low evaporation under a working condition of high temperature; and according to the magnetic liquid sealing device, the pollution caused by the evaporation of the magnetic liquid to the sealing space is effectively prevented, the evaporation loss of the magnetic liquid is also reduced due to the reduction of the evaporation amount of the magnetic liquid, and the maintenancecycle and service life of the magnetic liquid sealing device are indirectly prolonged.

Description

technical field [0001] The invention belongs to the technical field of mechanical engineering sealing, and is particularly suitable for sealing at a temperature below -40°C and above 60°C in the fields of military industry, ships, navigation, aerospace and the like. Background technique [0002] Magnetic liquid is a new type of functional material, which is a stable colloidal solution formed by uniformly dispersing nanoscale magnetic solid particles in the carrier liquid. One of the most important applications of ferrofluids is ferrofluid sealing. The magnetic liquid seal has a tight seal, and its leakage rate is almost difficult to measure; and because it is a non-contact seal, it has a long life, high reliability, and can withstand high speeds. [0003] In actual use, some special fields require the magnetic liquid to work in a wide temperature range from below -40°C to above 60°C. Under low temperature conditions, especially below -40°C, the viscosity of the magnetic fl...

Claims

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Application Information

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IPC IPC(8): F16J15/40
CPCF16J15/403
Inventor 李德才牛思放武杰于文娟
Owner BEIJING JIAOTONG UNIV
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