High-linear-speed rotating magnetic liquid sealing device with small radial size

Abstract

The invention discloses a high-linear-speed rotating magnetic liquid sealing device with a small radial size, and belongs to the field of mechanical engineering sealing. The device is especially suitable for sealing of high-linear-speed rotating working conditions. The problems that when the linear speed is low in the rotating shaft starting process, an existing magnetic liquid centrifugal sealing structure is insufficient in pressure resisting capacity and low in reliability are solved. The device is composed of a rotary shaft (1), a shell (2), a left bearing (3), a first magnetic isolating ring (4-1), a first pole shoe (5-1), a first sealing ring (6-1), a first permanent magnet (7-1) and the like. When the rotary shaft rotates at low linear speed, the device achieves a sealing function through an axial magnetic liquid sealing assembly, under the condition that axial space is sufficient, the number of sealing teeth of axial magnetic liquid can be increased, the pressure resisting capacity can be improved, and therefore the reliability of sealing is improved, and the problem that the existing magnetic liquid centrifugal sealing structure is insufficient in pressure sealing capacity in the rotary shaft starting process is solved. Meanwhile, the pressure resisting capacity of centrifugal sealing in the high-linear-speed rotating process of the rotary shaft (1) is improved.

Description

technical field [0001] The invention belongs to the field of mechanical engineering seals, and is especially suitable for high linear speed rotating working conditions. Background technique [0002] Magnetic liquid seals have achieved extensive and irreplaceable roles in many high-tech fields such as aerospace, electronic technology, mechanical chemistry, energy metallurgy, etc., due to their excellent characteristics such as zero leakage, no solid friction, no mechanical friction, low energy consumption, and long life. The application of low linear speed rotation in various fields has been relatively mature, and is developing towards the sealing direction of high linear speed rotation. As the diameter of the rotating shaft becomes larger and the rotational speed becomes higher, the higher the linear velocity of the sealing part, the greater the centrifugal force on the magnetic liquid. The existing magnetic liquid centrifugal seal structure can use the high linear velocity ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the existing magnetic liquid centrifugal seal structure has a limited radial space, the number of sealing teeth of the centrifugal seal is small, and the magnetic liquid seal has insufficient pressure resistance when the linear velocity is low during the start-up process of the rotating shaft.

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