Magnetic liquid sealing and dynamic pressure bearing combined sealing device
A technology of magnetic fluid and dynamic pressure bearings, applied in shafts and bearings, bearing components, engine seals, etc., can solve problems that affect the life and reliability of magnetic fluid seals, seal failures, and difficulty in ensuring seal gaps, etc.
Active Publication Date: 2021-12-28
TSINGHUA UNIV
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Problems solved by technology
[0002] The magnetic liquid sealing device is widely used due to its advantages of zero leakage, low friction and long life. The radial runout is large, which affects the life and reliability of the magnetic liquid seal
[0003] In the related art, the magnetic liquid sealing device has a rolling bearing or a sliding bearing. For a magnetic liquid sealing device with a large diameter of the rotating shaft, when the rolling bearing is used, there is a large radial clearance between the rolling bearing and the rotating shaft, and the rotating shaft is more prone to radial clearance. It is not easy to ensure the sealing gap between the pole shoe and the rotating shaft of the magnetic liquid seal device, which will cause the pole teeth in the pole shoe and the rotating shaft to be easily worn and fatigued, which will seriously reduce the reliability of the magnetic liquid seal, and also It will reduce its service life. When sliding bearings are used, due to the characteristics of sliding bearings, the sealing gap cannot be guaranteed, and subsequently, the runout of the shaft increases, resulting in seal failure
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Embodiment Construction
[0031] Embodiments of the invention will be described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0032] Such as Figure 1 to Figure 3 As shown, the combined magnetic liquid seal and dynamic pressure bearing sealing device of the embodiment of the present invention includes a rotating shaft 1 , a housing 2 , a pole piece unit and a bearing 4 .
[0033] A cavity is provided in the casing 2, at least part of the rotating shaft 1 is rotatably fitted in the cavity, the pole shoe unit is sleeved on the rotating shaft 1, and the inner peripheral wall of the pole shoe unit is sealed with the outer peripheral wall of the rotating shaft 1 by a magnetic liquid. The bearing 4 is arranged in the cavity and sleeved on the rotating shaft 1. The bearing 4 is located on...
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The invention discloses a magnetic liquid sealing and dynamic pressure bearing combined sealing device. The device comprises a shell, a rotating shaft, a pole shoe unit and a bearing, a cavity is formed in the shell, at least part of the rotating shaft is rotationally matched in the cavity, the pole shoe unit is arranged on the rotating shaft in a sleeving mode, the inner circumferential wall of the pole shoe unit and the outer circumferential wall of the rotating shaft are sealed through magnetic liquid, the bearing is arranged in the cavity and is arranged on the rotating shaft in a sleeving mode, the bearing is located on at least one side, in the length direction of the rotating shaft, of the pole shoe unit, and the space between the inner circumferential surface of the bearing and the outer circumferential surface of the rotating shaft is filled with the magnetic liquid. The magnetic liquid sealing and dynamic pressure bearing combined sealing device has the advantages of good sealing performance, long service life and the like.
Description
technical field [0001] The invention relates to the technical field of mechanical engineering sealing, in particular to a combined sealing device of a magnetic liquid seal and a dynamic pressure bearing. Background technique [0002] The magnetic liquid sealing device is widely used due to its advantages of zero leakage, low friction and long life. The radial runout is large, which affects the life and reliability of the magnetic liquid seal. [0003] In the related art, the magnetic liquid sealing device has a rolling bearing or a sliding bearing. For a magnetic liquid sealing device with a large diameter of the rotating shaft, when the rolling bearing is used, there is a large radial clearance between the rolling bearing and the rotating shaft, and the rotating shaft is more prone to radial clearance. It is not easy to ensure the sealing gap between the pole shoe and the rotating shaft of the magnetic liquid seal device, which will cause the pole teeth in the pole shoe an...
Claims
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IPC IPC(8): F16J15/43F16C35/02
CPCF16J15/43F16C35/02
Inventor 李德才李世聪
Owner TSINGHUA UNIV