Cross-shaped stepped magnetofluid sealing device

Abstract

The invention provides a cross-shaped stepped magnetofluid sealing device. The cross-shaped stepped magnetofluid sealing device comprises a stepped shaft, a shell, a left pole shoe, a right pole shoeand a permanent magnet ring. The stepped shaft is arranged in the shell in a sleeved mode. The stepped shaft comprises an intermediate shaft body with the maximum diameter and a plurality of secondaryshaft bodies with the diameters becoming smaller gradually, and the stepped shaft is bilaterally symmetrical with the intermediate radial section of the intermediate shaft body as the boundary. The permanent magnetic ring is arranged at the position, corresponding to the outer circumference surface of the intermediate shaft body, of the inner wall of the shell, and a gap is reserved between the permanent magnet ring and the outer circumferential surface of the intermediate shaft body. The left pole shoe and the right pole shoe are arranged on the two sides of the permanent magnet ring correspondingly and are symmetrical. Cross-shaped pole teeth are arranged at the junctions of the upper outer circumferential surfaces and end faces of the left and right pole shoes and extend towards the outer circumferential surfaces of the secondary shaft bodies and the end faces of the secondary shaft bodies or the end face of the intermediate shaft body correspondingly, gaps are reserved between theouter circumferential surfaces and the end faces, and magnetofluid is located in the gaps. By adoption of the cross-shaped stepped magnetofluid sealing device, sealing can be achieved in special working conditions such as high-speed and heavy-load working conditions.

Description

technical field [0001] The invention belongs to the field of mechanical engineering seals, in particular to a cross-shaped stepped magnetic fluid seal device. Background technique [0002] When the magnetic fluid sealing technology is applied in a large-diameter, high-speed and heavy-duty sealing environment, the magnetic fluid in the sealing gap often fails because the sealing gap is too large. Therefore, improving the pressure resistance of the large-gap magnetic fluid seal is a hot topic in current research. one. [0003] One of the methods to improve the pressure resistance performance of magnetic fluid seals under large gaps is to improve the structure of magnetic fluid seals, such as the sealing device described in reference 1 (the patent with publication number CN 103115152A) and the seal device described in reference 2 (the patent with publication number CN103498939A Patent) described sealing device. Although the sealing performance of the two sealing devices descr...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a cross-shaped stepped magnetic fluid sealing device, so as to solve the problem that the existing sealing device cannot meet the high sealing performance requirements of special working conditions such as high speed and heavy load, so that the sealing technology can be successfully applied to high speed and heavy load, etc. Under special conditions

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