Magnetic powder and magnetic liquid combined sealing device

A magnetic liquid and sealing device technology, which is applied in the direction of engine sealing, bearing components, engine components, etc., can solve the problems that the sealing device cannot be realized, and the high pressure resistance of the sealing medium can be changed, so as to achieve strong sealing adaptability and simple operation Effect
CN110939739AActive Publication Date: 2020-03-31TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2020-03-31

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Abstract

The invention discloses a magnetic powder and magnetic liquid combined sealing device, which comprises a shell, a rotating shaft, a first pole shoe, a second pole shoe, a permanent magnet, an end cover and a temperature sensor, wherein an accommodation cavity is formed in the shell; the rotating shaft is rotatably arranged in the accommodating cavity, and a first blind hole, a second blind hole, afirst via hole and a second via hole are formed in the rotating shaft; the first pole shoe is arranged on the outer side of the rotating shaft, a plurality of first pole teeth are arranged on the inner circumferential wall of the first pole shoe, and magnetic powder is arranged between the tooth top surface of each first pole tooth and the outer circumferential surface of the rotating shaft; thesecond pole shoe is arranged on the outer side of the rotating shaft in a sleeving mode, a plurality of second pole teeth are arranged on the inner circumferential wall of the second pole shoe, and magnetic powder is arranged between the tooth top surface of each second pole tooth and the outer circumferential surface of the rotating shaft; the permanent magnet sleeves the rotating shaft and is positioned between the first pole shoe and the second pole shoe; the end cover is positioned on one side, far away from the first pole shoe, of the second pole shoe; and the temperature sensor is arranged on the rotating shaft. According to the magnetic powder and magnetic liquid combined sealing device, the requirements for zero leakage and high pressure resistance can be met.
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Description

technical field

[0001] The invention relates to the technical field of mechanical engineering sealing, in particular to a sealing device combining magnetic powder and magnetic liquid. Background technique

[0002] In the related art, the magnetic powder is a powder composed of nanoparticles wrapped by a surfactant, which exhibits superparamagnetism under a magnetic field. The sealing device using magnetic powder can withstand a large pressure difference and has a high pressure resistance, but it cannot achieve zero leakage of the sealed substance (zero leakage here means that the leakage rate is lower than 10 -11 cm 3 / s). The magnetic liquid is a stable colloid formed by uniformly dispersing nanoparticles wrapped by surfactants into the base carrier liquid. The sealing device using magnetic fluid can realize zero leakage of the sealing device, but the pressure difference it can withstand is small.

[0003] However, the sealing device in the related art cannot change the...

Claims

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