Sealing device with evenly distributed magnetic liquid

Abstract

The invention relates to a sealing device with evenly distributed magnetic liquid, which belongs to the sealing field of mechanical engineering. The sealing device comprises a sealing assembly formed by installing a left bearing, a left pole shoe with a rubber sealing ring, a permanent magnet, a right pole shoe with a rubber sealing ring and a right bearing together. The space between the internal surface of the permanent magnet and the external surface of an axle is between 5 mm and the height of pole teeth to ensure that magnetic liquid successfully inflows into the clearance between the pole teeth and the axle under the action of magnetic field force, the width center of the permanent magnet is radially provided with a through hole, a through hole with tapered threads is arranged on the position of a casing, the width between the through hole and the left surface is l plus the width of the left bearing plus the width of the left pole shoe with the rubber sealing ring plus half of the width of the permanent magnet, a pipe head is connected in the through hole with tapered threads, and the sealing assembly is filled with air to ensure each pole tooth of the pole shoe to be distributed with the magnetic liquid, thereby the compressive resistance of the device is improved, and the service life of the device is prolonged.

Description

technical field [0001] The invention belongs to the field of mechanical engineering sealing. Background technique [0002] In the existing design of magnetic liquid sealing device, the magnetic liquid is usually injected into the gap between the magnet and the pole piece before installing the seal assembly, and after the shaft and the seal assembly on it are sequentially loaded into the housing, the magnet, pole piece, and shaft will form a In the magnetic circuit, under the action of the magnetic field force, the magnetic liquid flows into the gap between the pole shoe pole teeth and the shaft, and several liquid "O" rings are formed in the gap to realize the sealing effect. When the distance between the permanent magnet and the shaft is too large, the magnetic liquid cannot flow into the sealing gap only under the action of the magnetic field force; when the number of pole teeth on the pole piece is large, the distribution of the magnetic liquid is uneven, and there is alm...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that during the equipment process of the existing magnetic liquid seal, the magnetic liquid cannot smoothly flow into the sealing gap under the action of the magnetic field force, or the distribution of the magnetic liquid is uneven, and there is no chance of the magnetic liquid on some pole teeth. Existence, so that the pressure resistance capacity is not proportional to the number of sealing stages, resulting in a decrease in the overall pressure resistance capacity

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