A conical magnetic fluid sealing device

Abstract

The invention relates to the technical field of mechanical engineering sealing, and particularly relates to a cone magnetic fluid sealing device. The device comprises an outer pole piece, an inner pole piece, outer permanent magnets and inner permanent magnets, wherein the inner pole piece sleeves a shaft, the outer wall of the inner pole piece is a conical surface, a plurality of annular grooves I are formed in the conical surface at intervals, and pole teeth I are formed between two adjacent annular grooves I; the inner permanent magnets are installed in the annular grooves I; the outer pole piece is installed on the inner wall of a shell, the inner wall of the outer pole piece is a conical surface, the inner wall of the outer pole piece is parallel to the outer wall of the inner pole piece, a plurality of annular grooves II which correspond to the annular grooves I are formed in the inner wall of the outer pole piece, and pole teeth II are formed between two adjacent annular grooves II; the outer permanent magnets are respectively installed in the annular grooves II; the pole teeth I respectively correspond to the pole teeth II, and gaps are formed between the pole teeth I and the pole teeth II. The sealing device has high pressure-resistant capacity, and the problem of poor sealing performance and reliability of an existing large-gap magnetic fluid sealing device is solved.

Description

technical field [0001] The invention relates to the technical field of mechanical engineering sealing, in particular to a conical magnetic fluid sealing device. Background technique [0002] Magnetic fluid seals have the advantages of zero leakage and no rigid friction, and are widely used in various industries. However, the bearing pressure value of the magnetic fluid shaft seal is very sensitive to the size of the seal gap. If the seal gap increases by 0.1mm, the pressure bearing value of the magnetic fluid shaft seal can be reduced by more than 10%. When the magnetic fluid sealing technology is applied in a large-diameter, high-speed and heavy-duty sealing environment, the large radial runout of the rotating shaft requires a large sealing gap, and the performance of the magnetic fluid sealing decreases significantly with the increase of the sealing gap. It is conducive to the stability of sealing performance, thus limiting the application of magnetic fluid sealing techno...

AI Technical Summary

Problems solved by technology

When the magnetic fluid sealing technology is applied in a large-diameter, high-speed and heavy-duty sealing environment, the large radial runout of the rotating shaft requires a large sealing gap, and the performance of the magnetic fluid sealing decreases significantly with the increase of the sealing gap. It is conducive to the stability of sealing performance, thus limiting the application of magnetic fluid sealing technology in large gaps, high speed and heavy load conditions

Therefore, it is of great significance to improve the performance of magnetic fluid sealing under the condition of large gap. The existing magnetic fluid sealing device has the problem of low pressure resistance under the condition of large gap.

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