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Magnetic fluid dynamic seal device and preparation method of magnetic fluid

A magnetic fluid, dynamic sealing technology, applied in the direction of engine sealing, encapsulation/impregnation, inductance/transformer/magnet manufacturing, etc., can solve the problems of high linear speed, long life and large gap at the same time, and achieve low viscosity and high Magnetic saturation strength, resistance to external pressure, and the effect of improving sealing ability

Active Publication Date: 2020-11-24
HEILONGJIANG INST OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the problem that the existing magnetic fluid sealing device cannot satisfy high linear velocity, long life and large gap at the same time

Method used

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  • Magnetic fluid dynamic seal device and preparation method of magnetic fluid
  • Magnetic fluid dynamic seal device and preparation method of magnetic fluid
  • Magnetic fluid dynamic seal device and preparation method of magnetic fluid

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Experimental program
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specific Embodiment approach 1

[0018] Specific implementation mode one: combine Figure 1 to Figure 3 Describe this embodiment, a magnetic fluid dynamic sealing device includes a housing 1, a gland 2, a hollow magnetic seat 4, a hollow base 8 and a plurality of sealing rings 9, the shell 1 is made of non-magnetic stainless steel material, the hollow magnetic The seat 4 is installed on the hollow base 8. The hollow base 8 is made of non-magnetic material or weakly magnetic material. The housing 1 is set on the outside of the hollow magnetic permeable base 4 and installed on the hollow base 8. The inner wall of the housing 1 and the hollow There is a space between the outer walls of the magnetic permeable seat 4, which also includes the upper pole shoe 5, the middle pole shoe 6, the lower pole shoe 7, magnetic fluid, bearing housing 11 and two NdFeB magnets 10, and the hollow base 8 is installed On the bearing housing 11, the lower pole piece 7, one NdFeB magnet 10 of the two NdFeB magnets 10, the middle pole...

specific Embodiment approach 2

[0032] Specific implementation mode two: combination Figure 1 to Figure 2To describe this embodiment, the upper pole piece 5 , the middle pole piece 6 and the lower pole piece 7 of this embodiment are all made of magnetically permeable materials. Such arrangement prevents leakage of magnetic lines of force. Other compositions and connections are the same as in the first embodiment.

specific Embodiment approach 3

[0033] Specific implementation mode three: combination Figure 1 to Figure 2 The present embodiment will be described. The thicknesses of the upper pole piece 5 and the lower pole piece 7 in this embodiment are smaller than the thickness of the middle pole piece 6 . In this way, three sets of magnetically conductive pole pieces are used, the upper and lower pole pieces are 30mm thick and 30mm wide, and the middle layer is 40mm wide and 30mm wide. It can absorb 95% of the distribution of magnetic force lines, which improves the sealing ability and prevents the leakage of the magnetic field. Other compositions and connections are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides a magnetic fluid dynamic seal device and a preparation method of magnetic fluid, and relates to the dynamic seal device and the preparation method of the magnetic fluid. The magnetic fluid dynamic seal device and the preparation method solve the problems that the high linear speed, the long service life and the large gap cannot be achieved at the same time through an existing magnetic fluid seal device. A lower layer pole shoe, one neodymium iron boron magnet, a middle layer pole shoe, the other neodymium iron boron magnet and an upper layer pole shoe of the magnetic fluid dynamic seal device are installed between the inner side wall of a shell and the outer side wall of a hollow magnetic conduction base. The magnetic fluid is magnetic fluid high in magnetic saturation degree and low in viscosity, and the magnetic fluid is injected between the upper layer pole shoe, the middle layer pole shoe, the lower layer pole shoe and the outer side wall of the hollow magnetic conduction base. Fe3O4 magnetic powder with the weight being 50 g and Fe3O4 / graphene composite material with the weight being 5 g are placed in mixed caprylic capric triglycerride to be stirred; asurface active agent is added and continues to be stirred; polyisobutene with the weight being 3 g is placed in mixed liquid to continue to be stirred, and the temperature is raised to 150 DEG C; andfatty amine polyoxyethylene ether is added to be stirred, and the low-viscosity and high-stability magnetic fluid is obtained. The magnetic fluid dynamic seal device and the preparation method are used for magnetic fluid dynamic sealing.

Description

technical field [0001] The invention relates to a dynamic sealing device and a preparation method of magnetic fluid, in particular to a magnetic fluid dynamic sealing device and a preparation method of magnetic fluid. Background technique [0002] The magnetic fluid sealing device can be applied to shaft transmission and sealing equipment, such as single crystal furnaces, coating machines, centrifuges and other fields. Magnetic fluid not only has the characteristics of magnetic materials and liquids, but also has the ability to control rheology by using a magnetic field. Under the condition of material ring magnetic field, the O-ring sealing ring can be firmly attached to the surface of the shaft surrounded by the magnetic force lines, and rely on the magnetic attraction force to resist the external pressure under the condition of positive pressure or negative pressure. However, the current magnetic fluid sealing device can only operate under the conditions of small gap, sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/43H01F41/00H01F41/02
CPCF16J15/43H01F41/02H01F41/005
Inventor 布和巴特尔李红辉冉光斌许元恒彭国文李心耀
Owner HEILONGJIANG INST OF TECH
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