Labyrinth-type magnetofluid sealing device

Abstract

The invention relates to the field of machinery engineering sealing, and concretely relates to a labyrinth-type magnetofluid sealing device. The device comprises a shaft, a housing, a first pole shoe ring, a second pole shoe ring, and a third pole shoe ring; the first pole shoe ring is positioned at the left side of the second pole shoe ring, a pole tooth I is established at the right end of the first pole shoe ring, an annular groove I is established at the left end of the first pole shoe ring, a permanent magnet I is arranged in the annular groove I, a pole tooth II and a pole tooth III are established at the left end of the second pole shoe ring, an annular groove II is established at the right end of the second pole shoe ring, a permanent magnet III is arranged in the annular groove II, the third pole shoe ring is arranged at the external circular surface of the second pole shoe ring, a space is kept between the third pole shoe ring and the first pole shoe ring, a permanent magnet II is arranged in the space, the pole tooth II is positioned over the pole tooth I at the top of the first pole shoe ring, the pole tooth III is positioned below the pole tooth I at the bottom of the first pole shoe ring, and the pole tooth I stretches into the space composed of the pole tooth II and the pole tooth III.

Description

technical field [0001] The invention belongs to the technical field of mechanical engineering sealing, and in particular relates to a magnetic fluid sealing device with simple structure and high self-repairing ability. Background technique [0002] When the external pressure of the ordinary magnetic fluid sealing device is greater than its rated pressure, the magnetic fluid seal will fail, and the leakage of the magnetic fluid will be large, resulting in weak self-repair ability, that is, the secondary pressure bearing capacity is low, thereby reducing the magnetic fluid. Therefore, delaying the leakage of ferrofluid is of great significance for improving the pressure resistance and reliability of ferrofluid seals. Most of the existing sealing devices have a straight-through labyrinth seal structure when injecting magnetic fluid. Once leakage occurs, the leakage of the magnetic fluid will be large, which will lead to a decrease in the critical pressure resistance and self-re...

AI Technical Summary

Problems solved by technology

[0002] When the external pressure of the ordinary magnetic fluid sealing device is greater than its rated pressure, the magnetic fluid seal will fail, and the leakage of the magnetic fluid will be large, resulting in weak self-repair ability, that is, the secondary pressure bearing capacity is low, thereby reducing the magnetic fluid. The reliability of the seal, so delaying the leakage of the magnetic fluid is of great significance for improving the pressure resistance and reliability of the magnetic fluid seal

Most of the existing sealing devices have a straight-through labyrinth seal structure when injecting magnetic fluid. Once leakage occurs, the leakage of the magnetic fluid will be large, which will lead to a decrease in the critical pressure resistance and self-repairing ability of the sealing device, and greatly reduce the sealing performance. reliability

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