A stepped shaft type magnetic fluid sealing device

Abstract

The invention discloses a stepped shaft type magnetofluid sealing device. The stepped shaft type magnetofluid sealing device comprises a shaft, an outer shell, sealing rings, pole shoes, magnetofluidand permanent magnets. The shaft penetrates the outer shell, extends out of the two ends of the outer shell and comprises a stepped shaft part, wherein the stepped shaft part is located inside the outer shell. The diameter of a middle step of the stepped shaft part is the maximum, and the diameters of steps at the left side and the right side are decreased progressively and sequentially. Every twoadjacent steps are in circular-truncated-cone transition. The stepped shaft part is provided with cylinder side faces and multiple circular-truncated-cone side faces, wherein the cylinder side facesare parallel with the axis of the shaft, and the circular-truncated-cone side faces are symmetrical about the axis. The inner surface of the outer shell is provided with the two or more pole shoes. Each annular permanent magnet is arranged between the corresponding two adjacent pole shoes. Each pole shoe is provided with radial pole teeth and bevel pole teeth, wherein the radial pole teeth protrude toward the cylinder side faces, and the bevel pole teeth protrude toward the circular-truncated-cone side faces. The magnetofluid is arranged between the radial pole teeth and the cylinder side faces as well as between the bevel pole teeth and the circular-truncated-cone side faces. By means of the stepped shaft type magnetofluid sealing device, the sealing capability and pressure endurance capability of the magnetofluid are greatly enhanced; and the problem that existing sealing devices cannot meet the high-sealing-performance requirement under special working conditions such as the high speed and heavy load is solved.

Description

technical field [0001] The invention belongs to the field of mechanical engineering seals, and in particular relates to a stepped shaft type magnetic fluid seal device capable of maintaining good sealing performance under high-speed and heavy-load working conditions. Background technique [0002] As one of the most representative applications, the birth of magnetic fluid sealing technology has opened up a new field of sealing technology. After decades of development, the ferrofluid seal has achieved high pressure, zero leakage, no wear, and low power consumption in terms of performance. It has developed into a variety of sealing structures such as single-stage, multi-stage, rotary, and linear in form. Gas, vacuum, liquid and other sealing objects. Ferrofluid seals have been widely used in special sealing occasions such as vacuum sealing, toxic gas sealing and dust prevention by virtue of the sealing effect and performance incomparable to traditional mechanical seals, and ha...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a stepped shaft type magnetic fluid sealing device, so as to solve the problem of low pressure resistance existing in the existing sealing device, so that the sealing technology can be successfully applied in the fields of high speed and heavy load, etc.

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