Magnetic liquid sealing device for large axial and radial swinging

Abstract

The invention discloses a magnetic liquid sealing device for large axial and radial swinging. The magnetic liquid sealing device for large axial and radial swinging comprises a shell, a shaft and a sealing unit; the shaft is rotationally arranged in the shell in a penetrating manner; the sealing unit is arranged in the shell and sleeves the shaft; the sealing unit comprises a shaft sleeve, a firstpole shoe, a second pole shoe and a permanent magnet; the shaft sleeve comprises a base body and an extending part; the extending part is located between the first pole shoe and the second pole shoein the axial direction of the shaft; a first gap is formed between the extending part and the first pole shoe in the axial direction of the shaft; a second gap is formed between the extending part andthe second pole shoe in the axial direction of the shaft; the first gap and the second gap are filled with magnetic liquids; the permanent magnet is arranged on the extending part in a sleeving manner; the permanent magnet and the extending part are arranged in a spaced manner in the radial direction of the shaft; and the permanent magnet is located between the first pole shoe and the second poleshoe. The magnetic liquid sealing device for large axial and radial swinging has the advantages of small size, convenience in installation, long service life and the like.

Description

technical field [0001] The invention relates to a mechanical engineering sealing device, in particular to a magnetic liquid sealing device used for large axial radial swing. Background technique [0002] The magnetic liquid seal device is widely used due to its advantages of zero leakage, low friction and long life. Therefore, the magnetic liquid seal is also more and more used in the sealing of the reactor to prevent air from entering the reactor to break the vacuum. environment, so as to ensure the high quality of products. In actual working conditions, due to the limited installation accuracy and machining accuracy of the magnetic liquid seal device, when the shaft rotates at high speed, there is a large runout in the radial direction of the shaft. The traditional magnetic liquid seal device will cause the pole teeth Collision with the rotating shaft will cause the seal to fail. Contents of the invention [0003] The present invention aims to solve one of the technica...

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Problems solved by technology

[0004] For this reason, the embodiment of the present invention proposes a magnetic liquid sealing device for large shaft radial swing, the magnetic liquid sealing device can solve the problem of friction between the pole teeth and the rotating shaft caused by the radial runout of the shaft, which leads to the failure of the sealing device problems, has the advantages of zero leakage, high reliability, long service life, etc.

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