Convex step shaft magnetofluid sealing device

Abstract

The invention relates to a convex step shaft magnetofluid sealing device. The convex step shaft magnetofluid sealing device comprises a shell, a sealing assembly and an end cover. The sealing assemblycomprises a shaft. The shaft is rotationally arranged in the shell through a bearing. The shaft comprises at least one convex step part. The convex step part comprises a plurality of steps sequentially arranged in the axial direction, and the outer walls of the adjacent steps are connected through arc chamfered transition faces. Each transition face is sleeved with a pole shoe matched with the transition face, wherein the pole shoe extends towards one or two sides of the transition face to the position corresponding to the corresponding step on the side portion of the transition face. Gaps are reserved between the inner walls of the pole shoes and the corresponding transition faces and between the inner walls of the pole shoes and the steps. Pole teeth are arranged on the inner walls of the pole shoes and/or the parts, corresponding to the inner walls of the pole shoes, of the shaft. Permanent magnets are arranged between the adjacent pole shoes. The convex step shaft magnetofluid sealing device is high in pressure resisting capability, the secondary pressure bearing capability and the self-repairing capability are high, the pressure resisting capability and the sealing reliability of magnetic fluid seals under the condition of large gaps are high, and the safety work range is wide.

Description

technical field [0001] The invention relates to a convex stepped shaft magnetic fluid sealing device, which belongs to the field of mechanical engineering sealing. Background technique [0002] The magnetic fluid seal is to use the magnetic fluid seal ring formed by the magnetic fluid under the action of a strong magnetic field to seal the gas and liquid. Since the seal shaft is contacted and sealed by the magnetic fluid, the seal shaft and the seal are avoided. The direct friction and the additional load are reduced. In addition, the magnetic fluid seal also has the characteristics of zero leakage, high reliability, and simple structure. Although the technology of ferrofluid in vacuum and low-pressure sealing has been relatively mature and widely used, there are still many problems unsolved in high-pressure gas and liquid sealing, such as the pressure of ferrofluid sealing is too small, the sealed The medium will cause the deterioration of the magnetic fluid and cause the ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a convex stepped shaft magnetic fluid sealing device, thereby solving the problem of low pressure resistance existing in the existing single magnetic source magnetic fluid sealing device and multi-magnetic source magnetic fluid sealing device, while reducing stress concentration, This makes the sealing technology successfully applied in high-speed and heavy-duty fields

Images